vrf system application

8/2/2019 VRF System Application

1/21

Aramco Overseas Company King Abdullah Sports City

MEP Specification

WER5, KA101-OVE-05_ZZZ-XTC-Z0-00001 | Rev 2.0 | August 2011 Page 238

fixed low volume supply/extract rate to the general kitchen areas and a fixed high volumesupply/extract rate including the extract hood

1.8 CONCOURSE WCS, ABLUTIONS, BIN STORE, ROYAL BOX SMOKING ROOMEXTRACT VENTILATION

Extract ventilation systems will serve WC areas, Ablutions, Bin stores, Royal Box Smoking

Rooms and cleaners closets in the public concourses.

The system will consist of packaged duty/standby extract fan units, motorised isolation

dampers and attenuators. Air will be extracted from each area via high level extract grilles

which connect to a common ductwork system which rises within the core areas to the fans.Exhaust air is discharged to dedicated roof exhaust points.

Each extract system provides a minimum of 6 air changes per hour. Air is made up from the

adjacent concourses. The system will operate via a fixed timed schedule.

1.9 SERVICE ROAD VENTILATION

The service road at Level 1 will be ventilated to remove vehicle fumes and control carbonmonoxide (CO) levels.

The system comprises of 4 variable speed extract fans arranged in two pairs, high levelextract ductwork, and grilles exhaust ductwork discharging air through two exhaust

terminals at level 2. High velocity induction fans are provided to move air and entrained

fumes towards the extract fans

The extract fans will be located towards the centre of the service road, each pair of fans will

connect to a common exhaust duct which will then connect to the exhaust outlets at Level 2.

The induction fans will be arranged to ensure air and fumes are directed towards the extractfans and avoid the requirement for extensive ventilation ductwork within the service road.

Replacement air will be drawn through the service road entrances from outside and from thestadium bowl (via the pitch access portals).

The ventilation system will provide 3-6 air changes per hour of ventilation, the variablespeed fans will be controlled by CO sensors to ensure removal of vehicle fumes and

maintain the required CO levels.

1.10 FIRST AID ROOMS, TR, LS, LSS, LIFT CONTROL ROOMS AND BIN STORES

Each room will be provided with cooling only.

The cooling system will be a Variable Refrigerant Flow (VRF) system with internal wall

mounted/ ceiling suspended room fan coil units connected via refrigerant pipework to acommon external condenser unit.

The wall mounted indoor fan coil unit will re-circulate air within the room to maintain therequired room temperature. A temperature controller will be provided within each room.


2/21


MEP Specification


Bin stores are provided with extract ventilation, other spaces provided with minimumoutside air from either AHUs or by local room fans where these rooms are remote.

1.11 STADIUM SCREENS

The multi level screen equipment enclosures at the rear of the screens will be provided withcooling via multiple cooling units.

The cooling system will be a Variable Refrigerant Flow (VRF) system with internal wallmounted fan coil units connected via refrigerant pipework to a common external condenser

unit.

The wall mounted indoor fan coil unit which will re-circulate air within the enclosure tomaintain the required space temperature. Temperature controllers will be provided for each

cooling unit.

1.12 TV STUDIOS

The cooling system will be a Variable Refrigerant Flow (VRF) system with multiple ceiling

mounted 4 way cassette units connected via refrigerant pipework to a common externalcondenser unit.

The cassette units will re-circulate air within the studio to maintain the required space

temperature. A common temperature controller will be provided.

Minimum outside air will be provided from AHU 13.

1.13 EVENT CONTROL ROOM

The cooling system will be a Variable Refrigerant Flow (VRF) system with multiple ceilingmounted 4 way cassette units connected via refrigerant pipework to a common external

condenser unit.

The cassette units will re-circulate air within the control room to maintain the required space

temperature. A common temperature controller will be provided.

Minimum outside air will be provided by from AHU 14.

1.14 ELECTRICAL ROOMS

The cooling system will be a Variable Refrigerant Flow (VRF) system with a single ceilingmounted 4 way cassette unit connected via refrigerant pipework to a common external

condenser unit.

The cassette unit will re-circulate air within the room to maintain the required room

temperature. A temperature controller will be provided within each room.


3/21


MEP Specification


Minimum outside air will be provided either by AHUs or by local room fans where theseare remote.

1.15 PA/VA ROOMS

Rooms will be provided with DX type slimline floor mounted units to suit theroom/equipment loads, no additional system integrity will be provided.

The floor mounted units will re-circulate air within the room to maintain the required roomtemperature. A temperature controller will be provided within each room.

Minimum outside air will be provided by local room fans

1.16 MAIN COMMUNICATIONS ROOMS (TER 1 & 2, MOER & TIR 1, TIR2, RER1 & 2)

Each room will be provided with cooling and humidity control. The equipment will be

provided on an N+1 basis to provide the required resilience for the communicationssystems.

Within each room the system will consist of two Computer Room Air Conditioning (CRAC)units (N+1) which will re-circulate air within the room to maintain the required roomtemperature and humidity. Temperature controllers will be provided within each room.

Duplicate cooling systems will be provided within each CRAC unit comprising chilledwater coil and a DX cooling coil system connected via refrigerant pipework to dedicated

external condenser units. The chilled water coils will be utilised during normal operation on

power failure or loss of chilled water supply the units will switch to DX cooling.

Proposed equipment rack arrangements for these rooms are provided with hot aisle

containment. Warm air from the back of the racks will be ducted from the hot aislecontainment back to the CRAC units at high level within the space. No floor voids are

provided within these rooms, so air supply from the CRACs will be directly into the space.

Consideration should be given to the use of in-line CRAC units which can be locatedwithin the equipment rack rows. These type of units provide direct air supply to the front of

the racks.

Electric humidifiers will be provided within the CRAC units to maintain the required

humidity levels within the space.

Minimum outside air ventilation will be provided via the main air handling plant servinglevel 2 accommodation.

1.17 CRITICAL TRs, TRs +PA/VA,

Rooms will be provided with DX ceiling suspended room cooling units on an N+1 basis.

Minimum outside air will be provided by AHUs or local room fans where these spaces areremote.


4/21


MEP Specification


1.18 OB TR, ERES, EMES

Rooms will be provided with DX fed slimline floor mounted units to suit the

room/equipment loads, no additional system integrity will be provided.Minimum outside air will be provided by local room fans.

1.19 CB/UPS, CENTRAL BATTERY ROOMS

Rooms will be provided with DX ceiling suspended room cooling units on an N+1 basis.Minimum outside air will be provided by AHUs serving level 2 accommodation.

Continuous extract will be provided by local packaged duty/standby extract fans.

1.20 COOLING SYSTEM

Air cooled chillers will be provided to serve the Main Stadium, the Mosque and the Sports

Hall & Athletics Stadium (SHAS). The chillers will be located in the central chillercompound located to the north west of the Main Stadium in the car parking area.

The compound will accommodate the pump room containing primary and secondarycirculation pumps, pressurisation and expansion vessels, control panels and all otherassociated equipment/devices.

The chiller compound will be provided with screening to the top and sides to provide visualand acoustic screening as well as solar shading. The screening will allow free air movement

in and around the chillers.

Five air cooled chillers will provide the peak cooling demand for the site, no additionalresilience is provided on the basis that the simultaneous peak demand at each facility is not

anticipated so the system will have inbuilt resilience in the event of one chiller being out ofoperation. The chillers will be screw type compressors with multiple circuits within each

machine. The chillers will utilise R134A refrigerant.

The high efficiency air cooled chillers will provide chilled water with flow and returntemperatures of 7

oC/15

oC for an 8/14C flow and return temperature at cooling coils.

Constant volume primary pumps will circulate water through the five chillers and the lowloss primary header. Secondary circuit pumps circulate water through two circuits, one

serving the Main Stadium and Mosque and the other serving the SHAS.

Variable speed pumps will be utilised to allow the chilled water flow rate to be variedaccording to demand. Water flow rate is controlled by a combination of two port modulating

control valves, differential pressure control valves, sensors and commissioning valves.

Variable speed pumps will be inverter driven. Pressure differential control valves will beprovided to all AHU branch connections to maintain control valve authority.

The primary pumps will comprise of two duty and one standby pump. The secondary pumps

will comprise of two pumps, duty and standby. All pumps will be the single head type.

Under a mains power failure the BMS will close 2 port control valves for the following

AHUs: AHUs 1,5,7,8,9,10,11,12,13,14. Under this scenario the remaining AHUs will

operate as normal and will have generator backed MCCs to continue to provide cooling toevent critical areas.


5/21


MEP Specification


A combined system pressurization and pressure step control de-aeration unit will maintainsystem pressure and assist the removal of air from the system. The unit will incorporate

expansion vessels to accommodate water expansion within the system.

All chilled water pipework systems will be thermally insulated and provided with vapour

barriers. Chilled water will distributed from the externally located chillers to each buildingvia pre-insulated pipework buried directly in the ground.

Within each building the chilled water pipework will be distributed vertically within

services risers and horizontally within services distribution space at high level on each floor.

Cooling coils are sized to allow operation of AHUs in the event of failure of heat recovery

devices, but will be commissioned for normal duty based on cooling load summary. In theevent of heat recovery failure the AHU coil can receive an increased chilled water flow rate

in an emergency situation to allow performance to be maintained until repairs/replacementcan be made.

1.21 AHU SETBACK

During unoccupied periods the BMS will provide set-back cooling to maintain spaces to amaximum temperature of [28C]. Space temperature sensors will be used to determine the

requirement for setback cooing during unoccupied periods.

PART 2 - SPORTS HALL AND ATHLETICS STADIUM

2.1 CONSTANT AIR VOLUME (CAV) SPACES (AHU-MPS-01, AHU-MPS-02, AHU-MPS-03)

Air handling units and areas served are identified in the schedule below

AHU-MPS-01 L1 Plant rooms (North), L1 Storage Rooms (North ), L1 ElectricalRooms (North), L1 ICT Rooms (North), Battery Room

AHU-MPS-02L1 Plant rooms (South), L1 Storage Rooms (South), L1 Electrical

Rooms (South), L1 ICT Rooms (South)

AHU-MPS-03

L1 Changing Rooms, L1 Store rooms, L1 void underneath stadium

seating tribune (North), L1 void underneath stadium seating tribune

(South), L2 Electrical Rooms, L2 Toilets (North), L2 Toilets (South)

AHU-MPS-04 L2 AHU Plant Room (North)

AHU-MPS-05 L2 AHU Plant Room (South)

Air handling units serving constant air volume spaces will consist of outside air intake and

exhaust connections with motorised isolation dampers, panel and bag filter sections, energy

recovery thermal wheel or cross-flow heat exchanger, cooling coil, variable speed supplyand extract fans and attenuators.

From the air handling unit supply and extract ductwork will be connected to each room

served by the system.

Supply air will be ducted from the ceiling void mounted CAV boxes to ceiling supply

diffusers. Extract air will be ducted to the CAV boxes via ceiling extract grilles/ shadow gap

or ceiling plenums.


6/21


MEP Specification


A constant air volume will be supplied to each room; the variable speed drive on each fanmotor will be used to set the initial system air flow-rate during commissioning.

The air handling unit will be controlled to deliver air at a constant temperature [15oC].

The control system will increase the supply air temperature as necessary to maintain the

required room temperature (within each system a room will be designated as the

temperature controlled space) and avoid overcooling of the space.

The thermal wheel will be utilised to recovery energy from the exhaust air which will then

be utilised to pre cool the incoming outside air which will reduce the cooling coil load andchilled water demand.

Supply and extract ductwork will be insulated to minimise energy losses.

2.2 VARIABLE AIR VOLUME (VAV) SPACES (AHU-MPS-01, AHU-MPS-02, AHU-MPS-03, AHU-MPS-04, AHU-MPS-05)

Air handling units and areas served are identified in the schedule below

AHU-MPS-01L1 Back of House Accommodation (North), L2 Back of House Ac-

commodation (North)

AHU-MPS-02L1 Back of House Accommodation (South), L2 Back of House Ac-

commodation (South)

AHU-MPS-04Multi-Purpose Sports Hall, Internal Concourse, L2 Multi-Purpose

Sports Hall Circulation

AHU-MPS-05Multi-Purpose Sports Hall, Internal Concourse, L2 Multi-Purpose

Sports Hall Circulation

Air handling untis serving VAV spaces will consist of outside air intake and exhaust

connections with motorised isolation dampers, recirculation section and motorised damper,panel and bag filter sections, energy recovery thermal wheel, cooling coil, supply and

extract fans and attenuators.

The supply and extract fans will be variable speed type supplied with inverter drives.

From the air handling unit supply and extract ductwork will be connected to each room

served by the system.

Within each room the supply and extract ducts will connect to VAV boxes which will

operate in conjunction with a room temperature sensor to control the volume of air supplied

to the room to maintain design conditions. Supply air will be ducted from the ceiling voidmounted VAV boxes to ceiling/wall supply diffusers. Extract air will be ducted/returned to

the VAV boxes via ceiling extract grilles, shadow gap or ceiling plenums.

The air handling unit will be controlled to deliver air at a constant temperature [15o

C].

The thermal wheel will be utilised to recovery energy from the exhaust air which will thenbe utilised to pre cool the incoming outside air which will reduce the cooling coil load and

chilled water demand.


7/21


MEP Specification


VAV spaces will contain a CO2 sensor within the return air duct. This will be used tocontrol the outside air volume by modulation of the dampers within the AHU mixing section

to suit the occupancy of the room served.

All systems will operate on full recirculation outside occupied hours to maintain the

required space temperatures for fabric protection


2.3 MULTI PURPOSE SPORTS HALL, INTERNAL CONCOURSE, SPORTS HALLCIRCULATION

The Multi Purpose Sports Hall (MPS), Internal Concourse and Sports Hall Circulationwill be controlled using a VAV strategy via AHUs AHU-MPS-04 and AHU-MPS-05.

The MPS is designated as an event critical space. All ventilation, cooling and BMS

equipment and controls serving event critical spaces will be provided with generator backed

power supplies.

The AHUs serving the MPS, Internal Concourse and Sports Hall Circulation willoperate in 1 of 4 modes: Match mode, Badminton mode Break mode & AHU Setback.

The Multi-Purpose Sports hall will be provided cool air via jet diffusers and linear whirl

diffusers located at high level, in the ceiling void around the perimeter of the Hall. Thesewill condition the audience zone and field of play.

The audience zone will be served via jet and whirl diffusers terminating on the bulkhead in-between column locations. Ductwork to the diffusers will distribute in the ceiling voidabove the internal concourse and hall circulation.

The jet diffusers located between 2 adjacent columns will be grouped into diffuser banks

that are fed via a single separate duct branch. Whirl diffusers also located between 2adjacent columns will be grouped into diffuser banks that are fed via a single separate ductbranch. The duct branches feeding the diffuser banks will contain a motorised damper to

enable the modulation and isolation of air provided to that bank by the BMS.

Jet diffusers are located at high level on the bulk head elevation and serve the audience far

away from the diffuser location. Linear whirl diffusers are located at low-level on the

bulkhead elevation and serve the audience close to the diffuser location.

Jet diffusers serving the field of play will be served via on a single ductwork branch

containing a motorised controlled damper. This will be provided to enable the isolation of

field of play ventilation during badminton matches.

Swirl diffusers are provided in the ceiling voids above the Internal Concourse and SportHall circulation to condition these areas. These diffusers will supply air through the open

mesh grid ceiling. The grid ceiling is to be a minimum of 60% free area. The swirl diffuserswill be grouped into banks serving specific zones. Diffuser banks will be fed via a single

duct branch containing a motorised damper to enable the modulation and isolation of the air

provided.


8/21


MEP Specification


2.4 MATCH MODE

During Match mode motorised control dampers contained within duct branches serving the

internal concourse and Sports Hall Circulation will be set to minimum flow.

Motorised control dampers contained within ductwork branches serving the MPS will

modulate to maintain the required space temperature. The associated AHUs volume

flow rate will modulate as required.

2.5 BADMINTON MODE

During Badminton mode the motorised control dampers contained within ductworkbranches serving the field of play jet nozzles will be isolated to maintain the design airvelocity criteria. The remainder of the MPS ventilation system will operate as in Match.

2.6 BREAK MODE

During Break mode motorised control dampers contained within ductwork branches serving

the MPS will be set to minimum flow.

Mortised control dampers contained within duct branches serving the internal concourse andSports Hall Circulation will modulate to maintain the required space temperature. Theassociated AHUs volume flow rate will modulate as required.

2.7 AHU SETBACK

The operation of AHU Setback mode is detailed below.

The AHUs mode of operation will be controlled via the BMS system. An interface will beprovided in the Event Control Room to enable manual switching between match and

break modes during events.

2.8 FINISHING KITCHEN EXTRACT VENTILATION

The extract system will consist of exhaust connection, motorised isolation damper,bifurcated variable speed axial duty/standby extract fans, attenuators, and fire rated

ductwork connecting to the extract hood and finishing kitchen extract grilles.

The air temperature within the kitchens will be ventilation controlled. Local control

switches will be provided for operatives to start/stop the extract ventilation system toprovide a fixed low volume extract rate to the general kitchen areas and a fixed high volume

extract rate including the cooking extract hood.

Supply make-up air will be provided via AHU-MPS-02. The supply air volume willautomatically modulate to satisfy the supply-air condition for low and high volume extract

rates.

2.9 SMALL WCS, BIN STORES AND BATTERY ROOM EXTRACT VENTILATION

Extract ventilation systems will serve small WCs, Bin Stores and the Battery Room.


9/21


MEP Specification


The systems will consist of packaged duty/standby extract fan units, motorised isolationdampers and attenuators. Air will be extracted from each area via high level via high level

grilles, ceiling extract grilles, shadow gap or ceiling plenums .

Exhaust air is ducted to dedicated discharge exhaust points.

Small WC extract systems each provide a minimum of 35l/s per WC. The Battery Room

extract system provides 1 air change per hour. The bin store extract systems provide 6 airchanges per hour. For all systems make-up air is provided via adjacent spaces. The systems

will operate via a fixed timed schedule.

2.10 EVENT PRESENTATION ROOM

The Event Presentation Room is cooled using a VAV strategy via AHU-MPS-01. The room

contains a TE cabinet. The TE cabinet is cooled via air from the room. The cabinet door willcontain low level and high level grilles/openings in order to provide sufficient ventilation.

The Event Presentation Room supply and extract ducts will connect to VAV boxes whichwill operate in conjunction with a room temperature sensor to control the volume of air

supplied to the room to maintain design conditions.

2.11 PHOTO FINISH ROOM

The Photo Finish Room is cooled using a VAV strategy via AHU-MPS-02. The room

contains a TE cabinet and is designated as an event critical space. All ventilation, coolingand BMS equipment and controls serving event critical spaces will be provided with

generator backed power supplies.

The TE cabinet is cooled via air from the room. The cabinet door will contain low level and

high level grilles/openings in order to provide sufficient ventilation.

The Event Presentation Room supply and extract ducts will connect to VAV boxes whichwill operate in conjunction with a room temperature sensor to control the volume of airsupplied to the room to maintain design conditions.

2.12 ON VENUE RESULTS, TECHNICAL VIDEO ROOM, MEDICAL CENTRE

The On Venue Results, Technical Video Room and Medical Centre are cooled using a VAV

strategy via AHU-MPS-02. These rooms are designated as event critical spaces. Allventilation, cooling and BMS equipment and controls serving event critical spaces will beprovided with generator backed power supplies.

The On Venue Results, Technical Video Room and Medical Centre will contain supply andextract ducts connected to VAV boxes which will operate in conjunction with a room

temperature sensor to control the volume of air supplied to the room to maintain designconditions.


10/21


MEP Specification


2.13 ELECTRICAL ROOMS

L1 Electrical equipment room (e.g. LV switch rooms) and L2 electrical equipment rooms

(e.g. lift motor rooms) will be conditioned via a Variable Refrigerant Flow (VRF) coolingsystem. Spaces will contain wall/ceiling mounted fan coil units that are connected to

external condenser units located on the roof level via refrigerant pipework.

The room units will re-circulate air within the room to maintain the required temperature. Atemperature controller will be provided within each room.

Minimum outside air will be provided by associated AHUs.

The LV safety, LV SR Critical and Battery Es rooms are designated as event critical spaces.

All ventilation, cooling and BMS equipment and controls serving event critical spaces willbe provided with generator backed power supplies.

2.14 RADIO EQUIPMENT ROOMS (RER)

The RER will be conditioned via a Variable Refrigerant Flow (VRF) cooling system. The

room is designated as an event critical space. All ventilation, cooling and BMS equipmentand controls serving event critical spaces will be provided with generator backed power

supplies.

The RER will contain floor standing Computer Room Air Conditioning (CRAC) units with

humidity control. The equipment will be provided on an N+1 basis to provide the requiredresilience for the communications systems. The room units will re-circulate air within the

room to maintain the required temperature. A temperature controller will be provided withineach room.

CRAC units will be connected to external condenser units located on the roof level via

refrigerant pipework.

Minimum outside air will be provided by the associated AHU.

2.15 TR COMM

The TR Comm rooms will be conditioned via a Variable Refrigerant Flow (VRF) cooling

system. These rooms will contain the building PA/VA racks and are designated as eventcritical spaces. All ventilation, cooling and BMS equipment and controls serving eventcritical spaces will be provided with generator backed power supplies.

The equipment will be provided on an N+1 basis to provide the required resilience for theEvent Critical systems. The rooms will contain wall/ceiling mounted fan coil units that are

connected to external condenser units located on the roof level via refrigerant pipework.

Minimum outside air will be provided by the associated AHUs.

2.16 TE CABINET ROOM

The L1 TE cabinet room will be conditioned via a Variable Refrigerant Flow (VRF) cooling

system. The room will contain a wall mounted fan coil unit that is connected to externalcondenser units located on the roof level via refrigerant pipework.


11/21


MEP Specification


The room will be naturally ventilated via low level and high level grilles on the roomdoor/partition.

2.17 FOOD & BEVERAGE (F+B) SERVERY

The F+B serveries on the L2 internal concourse will operate under an extract only

ventilation strategy. Make up air will be provided via the Sports Hall. Extract ductwork willbe installed ready for the F+B company to connect extract services to. The ductworkprovided will be fire rated and allow for 20 air changes per hour. The remaining of the

extract ventilation system will be installed by F+B Servery company, space will be providedfor the installation of the extract system at high level in the space.

Space will be provided for the installation of a DX cooling system for each F+B severyroom. Space for condenser units will be provided at the North and South condenser

locations at roof level. Space provisions will allow for 250W/m2

cooling capacity for each

room. Space provisions for pipework distribution will be at high level in the room andadjacent plant room, to the condenser riser location.

2.18 AHU PLANT ROOMS

The L1 and L2 AHU plant rooms operate under a CAV strategy. Minimum fresh air is

provided to the rooms via the associated AHU. Temperature control will be provided by

bleeding air from the exhaust ductwork. Room temperature sensors will be used to switchthe AHU bleed on and off. A constant volume of air will be supplied to the room to

maintain the design conditions.

AHUs AHU-MPS-02, AHU-MPS-04 & AHU-MPS-05 serve event critical spaces. The

AHU plant and associated plant rooms are designated as event critical. All ventilation,cooling and BMS equipment and controls serving event critical spaces will be provided with

generator backed power supplies.

2.19 AHU SETBACK

During unoccupied periods the BMS will provide set-back cooling to maintain spaces to a

maximum temperature of [28C]. Space temperature sensors will be used to determine therequirement for setback cooing during unoccupied periods.

2.20 CHILLED WATER (CHW) PIPEWORK

Chilled water will be provided to the Sports Hall and Athletics Stadium (MPS) from themain stadium Chiller Compound. The CHW pipework will be distributed below ground

from the Chiller compound to the MPS chiller intake room. Here the pipework will rise to

high level and distribute to the L1 & L2 AHU plant rooms. The MPS chilled water leg fromthe chiller compound will be provided with leak detection.

2.21 ATHLETICS STADIUM SCREEN

The multi level screen equipment enclosure at the rear of the screen will be provided withcooling via multiple cooling units.


12/21


MEP Specification


The cooling system will be a Variable Refrigerant Flow (VRF) system with internal ceilingmounted fan coil units connected via refrigerant pipework to a common external condenser

unit. The units will re-circulate air within the enclosure to maintain the required spacetemperature. Temperature controllers will be provided for each cooling unit.

PART 3 - MOSQUE

3.1 VARIABLE AIR VOLUME (VAV) & CONSTANT AIR VOLUME (CAV) AIRHANDLING SYSTEM WITH MIXING SECTION

Air Handling Units and areas served are identified in the schedule below

AHU-01 Prayer Hall and Back of House

VAV/CAV Air handling units shall consist of outside air intake and exhaust connectionswith motorised isolation dampers, recirculation section and motorised damper, panel and

bag filter sections, Chilled Water cooling coil and associated valve and actuator, electricheater battery supply and extract fans and attenuators.

The supply and extract fans shall be variable speed type supplied with inverter drives.

From the air handling unit supply and extract ductwork will be connected to each roomserved by the system.

The air handling unit will operate under the dictates of the BMS system to deliver air at aconstant temperature [16C].

Within each room the supply and extract ducts will connect to VAV/CAV boxes which will

operate in conjunction with a room temperature sensor to control the volume of air suppliedto the room to maintain design conditions. Supply air will be ducted from the ceiling void

mounted CAV/VAV boxes to ceiling supply diffusers. Extract air will be ducted/returned tothe CAV/VAV boxes via ceiling extract grilles or shadow gaps.

Spaces that are served by CAV boxes from AHU-01 include: Admin, LV Rooms, BatteryRoom, Telecomms Enclosure, Storage Rooms, Lobbies and Jan/Cleaning/Dry Store. Spacesthat are served by VAV boxes from AHU-01 include: Prayer Hall and AHU Plantroom.

CO2 sensors within the return air duct/space will be provided to control the outside airvolume by modulation of the dampers within the mixing section to suit the occupancy of the

room served.

All systems will operate on full recirculation outside occupied hours to maintain the

required space temperatures for fabric protection.



13/21


MEP Specification


3.2 ABLUTIONS, LOBBIES AND WCS

Transfer and Extract ventilation systems will serve Male and Female Ablutions and Lobbies

and WC areas.

The systems will consist of packaged duty/standby transfer/extract fan units, motorised

isolation dampers and attenuators.

Extract air is extracted from each WC and at strategic points in the Ablutions and JanitorsStore via high level extract spigots which connect to a common ductwork system (one male,

one female), which rises within the ceiling void to the fans. Exhaust air is discharged viaexhaust louvers located at the external faade.

Air is made up from the Prayer Hall return air. Transfer air is taken from the Prayer Hallreturn air plenum via a common ductwork system (one male, one female) at high level and

connects to the transfer fans in the ceiling void and is distributed to high level supply air

diffusers. The Janitors Store is provided with supply air from the central AHU. Lobbyspaces are positively pressurised, WCs and Ablutions are negatively pressurised.

The quantity of transfer air is determined so to offset the cooling loads in the spaces. Each

extract system provides a minimum of 6 air changes per hour. The system will operate underthe dictates of the BMS.

3.3 WASTE STORE, BATTERY ROOM AND STORAGE 1 (CONTAINING BATTERYCHARGING EQUIPMENT)

The Waste Store and each room containing batteries will be provided with a dedicated

extract system that will operate continuously.

The systems will consist of packaged (run & standby) extract fan units and attenuators. Airwill be extracted from each area via high level extract grilles which connect to a dedicated

ductwork system which connects to the fans. Exhaust air is discharged via exhaust weatherlouvers located at the external faade c/w non-return dampers.

Each extract system provides a minimum of 6 air changes per hour. These spaces arenegatively pressurised. The systems will operate under the dictates of the BMS.

For the Waste Store, air is made up from the adjacent WC area. Storage 1 is provided withminimum outside air from the central AHU, air is made up from the adjacent Lobby area.

Battery Room cooling is provided by a constant volume of air from the central AHU.

3.4 PRAYER HALL FOYER

Each Prayer Hall Foyer is provided with a door air curtain unit. The units are selected to

minimise infiltration when the Prayer Hall is becoming occupied (i.e. when doors may beconstantly open) and to fit the spatial dimensions.

The air curtains are recirculation units only. The air curtains will operate on demand andunder the dictates of the BMS.


14/21


MEP Specification


3.5 COOLING SYSTEM

Chilled Water will be provided via a branch from the Main Stadium Central Chiller

Compound. The branch will be sized so that the pumps can accommodate the varying flowdemand.

A differential pressure control valve will be provided to the AHU branches to maintain

control valve authority.

PART 4 - ANCILLARY BUILDINGS

4.1 FOUL WASTE PUMPING STATION AIR HANDLING SYSTEM

Ventilation is provided to the Waste Pumping Station using a miniature Air Handling Unitmounted in the Office ceiling void. The Shower and WC spaces are negatively pressurised,

as is the kitchen, while the corridor and Office are positively pressurised. This draws cool

air from the office space and corridor into the WC and shower, providing some cooling, andcontains the gases, odours and latent loads associated with the WC, Kitchen and shower, in

their respective spaces.

The Foul Waste Pumping Station miniature air handling unit will have outside air intake andexhaust connections, cross-flow plate heat exchanger, panel filter sections, DX cooling coil

and variable speed supply and extract fans. Attenuation will be selected to meet the NR

ratings specified on the room data sheet.

Supply air will be ducted from the ceiling void mounted unit to ceiling supply diffusers.

Extract air will be ducted to the unit via ceiling-mounted extract valves. Outside air intakesare to be provided with sand louvers and exhaust air points will have non-return dampers

and standard weather louvers.

The unit shall be capable of operating under several modes with selection of the operating

mode to be determined by a local BMS outstation. The system shall provide run/faultsignals to be monitored by the BMS outstation.

Under heating mode or cooling mode, a constant air volume will be supplied to each room.

The variable speed drive on each fan motor will be used to set the initial system air flow-rate during commissioning.

Under heating setback or cooling setback a minimum or trickle air volume will be supplied

to the building.

The air handling unit will deliver air at a constant temperature setpoint, to be selected by the

BMS outstation, of [18C] under cooling mode, [uncontrolled] under heating mode, [22C]under cooling setback mode and [uncontrolled] under heating setback mode.

Supply ductwork will be insulated to minimise energy losses and to prevent condensation.

An estimate of the BMS Hardware Points (either Input {analogue/digital] and/or Output{analogue/digital} associated with this AHU is 14 Nr.


15/21


MEP Specification


4.2 FOUL WASTE PUMPING STATION COOLING SYSTEM

A Variable Refrigerant Flow (VRF) cooling system will be provided to serve the Foul

Waste Pumping Station. The heat rejection unit will be located within the Foul WasteCompound, to the north of the Foul Waste Pumping Station building.

The system shall operate in one of a minimum of 4 no. modes (heating mode, cooling mode,

heating setback, cooling setback), to be selected by a local BMS outstation. The unit shallprovide run/fault signals to be monitored by the BMS outstation.

Within the building refrigerant pipework will be distributed vertically within servicescupboards and horizontally within the ceiling void at high level on each floor.

Indoor units shall contain inverter-driven, variable speed fans, and shall be provided with alocal space temperature sensor. Units shall be programmed to maintain a constant space

temperature of [24C] in cooling mode, [uncontrolled] in heating mode, [30C] in cooling

setback mode and [uncontrolled] in heating setback mode), to be selected by the BMSoutstation. Indoor units shall be 4-way cassette type units, and shall be provided with a facia

plate that is of a RAL colour that has been approved by the architect.

Refer to BMS Reference Design Report for Main Stadium to determine required BMShardware points for the VRF/DX cooling system described above.

4.3 MAIN GATEHOUSE OFFICE AIR HANDLING SYSTEM

Ventilation is provided to the Main Gatehouse Office using a miniature Air Handling Unit

mounted in the Office ceiling void.

The Office miniature air handling unit will have outside air intake and exhaust connections

with cross-flow plate heat exchanger, panel filter sections and variable speed supply and

extract fans. Attenuation will be selected to meet the NR ratings specified on the room datasheet.

Supply air will be ducted from the ceiling void mounted unit to the back of the 4-way VRFcassette unit that is mounted alongside it. Extract air will be ducted to the unit via (a)

ceiling-mounted extract valve(s). Outside air intakes are to be provided with sand louversand exhaust air points will have non-return dampers and standard weather louvers.

The unit shall be capable of operating in a minimum of 2 modes (normal mode, setback

mode), with selection of the operating mode to be determined by a local BMS outstation.The system shall provide run/fault signals to be monitored by the BMS outstation

Under normal mode the unit will operate under the dictates of a proprietary CO2 monitoringsensor, to be located on the Office wall, at a height of between 3 and 6 feet.

Under heating setback or cooling setback a minimum or trickle air volume will be suppliedto the building.


An estimate of the BMS Hardware Points (either Input {analogue/digital] and/or Output{analogue/digital} associated with this AHU is 13Nr.


16/21


MEP Specification


4.4 MAIN GATEHOUSE KITCHEN AND WC AIR HANDLING SYSTEM

Ventilation is provided to the Main Gatehouse Kitchen using a miniature Air Handling Unit

mounted in the Kitchen ceiling void. Additional WC ventilation is provided using a wall-mounted WC extract fan.

The Kitchen miniature air handling unit will have outside air intake and exhaust connections

with cross-flow plate heat exchanger, panel filter sections and variable speed supply andextract fans. Attenuation will be selected to meet the NR ratings specified on the room data

sheet. Outside air intakes are to be provided with sand louvers and exhaust air points willhave non-return dampers and standard weather louvers.

Supply air will be ducted from the ceiling void mounted air handling unit to the back of the4-way VRF cassette unit that is mounted alongside it. Extract air will be ducted to the unit

via (a) ceiling-mounted extract valve(s). The exhaust connection from the kitchen airhandling unit will be ducted to a swirl diffuser mounted in the WC ceiling, maintaining the

room at an intermediate temperature (i.e. between that of the kitchen and outside).

The air handling unit shall be capable of operating in a minimum of 2 modes (normal modeand setback mode), with selection of the operating mode to be determined by a local BMS

outstation. The system shall provide run/fault signals to be monitored by the BMSoutstation.

Under normal mode the unit will operate under the dictates of a proprietary CO2 monitoring

sensor, to be located on the Kitchen wall, at a height of between 3 and 6 feet. Under setback

mode a minimum or trickle air volume will be supplied to the building.

The WC extract fan shall be operated by detection from a local PIR sensor, which willactivate the local fan controller for a programmable time period of [10] minutes.


An estimate of the BMS Hardware Points (either Input {analogue/digital] and/or Output

{analogue/digital} associated with this AHU is 13Nr.

4.5 MAIN GATEHOUSE COOLING SYSTEM

A Variable Refrigerant Flow (VRF) cooling system will be provided to serve the mainGatehouse Office and Kitchen buildings. The heat rejection unit will be located behind the

kitchen building, concealed from the main path of incoming visitors.

The system shall operate in one of a minimum of 2 no. modes (normal mode and setbackmode), to be selected by a local BMS outstation. The unit shall provide run/fault signals to

be monitored by the BMS outstation.

All refrigerant pipework will be thermally insulated and provided with vapour barriers.

Within the building refrigerant pipework will be distributed vertically within services

cupboards and horizontally within the ceiling void at high level on each floor.

Indoor units shall contain inverter-driven, variable speed fans, and shall be provided with alocal space temperature sensor. Units shall be programmed to maintain a maximum space

temperature of (24C) in normal mode and (30C) in setback mode, to be selected by the


17/21


MEP Specification


BMS outstation. Indoor units shall be 4-way cassette type units, and shall be provided witha facia plate that is of a RAL colour that has been approved by the architect.


4.6 CHILLER COMPOUND AIR HANDLING SYSTEM

Ventilation is provided to the Chiller Compound using a ceiling-mounted miniature AirHandling Unit hung from the pump room soffit.

The Chiller Compound air handling unit will have outside air intake and exhaustconnections with cross-flow plate heat exchanger, panel filter sections and variable speedsupply and extract fans. Attenuation will be selected to meet the NR ratings specified on the

room data sheet. Outside air intakes are to be provided with sand louvers and exhaust air

points will have non-return dampers and standard weather louvers.

Supply air will be ducted from the ceiling - mounted unit to duct-mounted grille outlets,

each of which is located close to the back of 3 no. ceiling-mounted high-static VRF cassetteunits in the pump room. Supply air to the LV room is ducted to a single grille located in theopposite corner to the LV room door. Extract air will be ducted to the air handling unit

from a duct-mounted grille located in the corner of the pump room. Return air from the LV

room is provided through the pump room, via door-mounted louvres.

The air handling unit shall be capable of operating in a minimum of 2 modes (normal mode

and setback mode), with selection of the operating mode to be determined by a local BMS

outstation. The system shall provide run/fault signals to be monitored by the BMSoutstation.

Under normal mode, a constant air volume will be supplied to each room. The variable

speed drive on each fan motor will be used to set the initial system air flow-rate during

commissioning.

Under heating setback or cooling setback a minimum or trickle air volume will be suppliedto the building.




4.7 CHILLER COMPOUND COOLING SYSTEM

A Variable Refrigerant Flow (VRF) cooling system will be provided to serve the Chiller

Compound Pump Room and LV Room. The heat rejection unit will be located in the aircooled chiller enclosure. The system shall operate in one of a minimum of 2 no. modes

(normal mode and setback mode), to be selected by a local BMS outstation. The unit shall

provide run/fault signals to be monitored by the BMS outstation.



18/21


MEP Specification


Indoor units shall contain inverter-driven, variable speed fans, and shall be provided with alocal space temperature sensor. Units shall be programmed to maintain a maximum space

temperature of (30C) in normal mode and (uncontrolled) in setback mode, to be selected bythe BMS outstation. Indoor units shall be high-static, ducted units, and shall be provided

with suitable fixtures to allow connection of the required supply and return air grilles.

Refer to BMS Reference Design Report for Main Stadium to determine required BMS

hardware points for the VRF/DX cooling system described above.

4.8 SOUTH AND WEST VEHICLE CHECKING FACILITY AIR HANDLING SYSTEMS

Ventilation is provided to the South and West Vehicle Checking Facilities using a miniatureAir Handling Unit mounted in the Office ceiling void.


with cross-flow plate heat exchanger, panel filter sections and variable speed supply andextract fans. Attenuation will be selected to meet the NR ratings specified on the room data

sheet. Outside air intakes are to be provided with sand louvers and exhaust air points will

have non-return dampers and standard weather louvers.

Supply air will be ducted from the air handling unit to the plenum at the back of the ducted

VRF unit that is mounted alongside it. Extract air will be ducted to the unit via ceiling-

mounted extract valves located in the kitchen and WC areas.

The unit shall be capable of operating in a minimum of 2 modes (normal mode, setback

mode), with selection of the operating mode to be determined by a local BMS outstation.

The system shall provide run/fault signals to be monitored by the BMS outstation.

Under normal mode the unit will be controlled to maintain a constant air volume to each

room. The variable speed drive on the extract fan motor will be used to set the initial

system air flow-rate during commissioning.


to the building.

Supply ductwork will be insulated to prevent condensation.

An estimate of the BMS Hardware Points (either Input {analogue/digital] and/or Output{analogue/digital} associated with this AHU is 12Nr.

4.9 SOUTH AND WEST VEHICLE CHECKING FACILITY COOLING SYSTEMS

A Variable Refrigerant Flow (VRF) cooling system will be provided to serve each of the

Vehicle Checking Facility buildings. The heat rejection unit will be located in the recessedsection of the WC wall, concealing the unit from visitors.

The system shall operate in one of a minimum of 4 no. modes (cooling mode, heating mode,

heating setback and cooling setback), to be selected by a local BMS outstation. The unitshall provide run/fault signals to be monitored by the BMS outstation.



19/21


MEP Specification


Within the building refrigerant pipework will be distributed vertically within servicescupboards and horizontally within the ceiling void at high level on each floor.

2 no. ducted, indoor units shall be provided, each containing inverter-driven, variable speedfans.

One unit shall meet the majority of the buildings space cooling loads, with return air from

shadow gaps around the ceiling edge to be draw into the unit via the ceiling plenum. Supplyair shall be via linear grilles located along the long Office window.

The second unit shall meet the buildings fresh air load and the load associated with thebuildings Telecoms equipment room. Outdoor air from the air handling unit and air from

an intake plenum at high level, at the back of the Telecoms equipment room shall be ductedinto an intake plenum on the back of the unit. Make-up air to the Telecoms equipment room

shall be provided via a louvred door.

Both units should be controlled to maintain a constant supply air temperature. The supplyair temperature setpoint shall be selected by the local BMS outstation, to [14C] in normal

mode and [uncontrolled] in setback or heating mode. The units fan speed should beindependently controlled to maintain a room air temperature setpoint which is also to be

selected by the BMS outstation. The room air temperature setpoint shall be [26C] incooling mode, [30C] in cooling setback mode, and [uncontrolled] in heating and heatingsetback mode.

Refer to BMS Reference Design Report for Main Stadium to determine required BMS

hardware points for the VRF/DX cooling system described above.

4.10 OUTSIDE BROADCAST COMPOUND VENTILATION SYSTEMS

Ventilation is provided to the Outside Broadcast Compound using a ceiling-mounted

miniature Air Handling Unit.

The unit will have outside air intake and exhaust connections with cross-flow plate heat

exchanger, panel filter sections and variable speed supply and extract fans. Attenuation willbe selected to meet the NR ratings specified on the room data sheet. Outside air intakes are

to be provided with sand louvers and exhaust air points will have non-return dampers andstandard weather louvers.

Supply air will be ducted from the air handling unit to the plena at the back of each of the 2

no. ducted, ceiling-mounted VRF unit that are mounted alongside it. Extract air will beducted to the unit via a duct-mounted return air grille located in the corner of the room.

The unit shall be capable of operating in a minimum of 2 modes (normal mode, setbackmode), with selection of the operating mode to be determined by a local BMS outstation.


Under normal mode the unit will be controlled to maintain a constant air volume to each

room. The variable speed drive on the extract fan motor will be used to set the initialsystem air flow-rate during commissioning.


to the building.


20/21


MEP Specification





4.11 OUTSIDE BROADCAST COMPOUND COOLING SYSTEMS

2 No. independent DX cooling systems will be provided to serve the Outside Broadcast

Compound. The heat rejection unit will be located within the OBC fence, concealing theunit from visitors.

The system shall operate in one of a minimum of 4 no. modes (cooling mode, heating mode,heating setback and cooling setback), to be selected by a local BMS outstation. The unitshall provide run/fault signals to be monitored by the BMS outstation.


Within the building refrigerant pipework will be distributed vertically within services

cupboards and horizontally within the ceiling void at high level on each floor.

2 no. ducted, indoor units shall be provided, each containing inverter-driven, variable speed

fans. Return air to the units is ducted from a plenum built to form the rear side of each ofthe 3 no. IT racks contained within the room. This is ducted directly into the plena that form

the back of each cooling unit, via a non-return damper. Cooled supply air is then discharged

directly into the rest of the room, surrounding the rack air intakes.

Both units should be controlled to maintain a constant supply air temperature of [24C].


4.12 ATHLETICS FACILITY GENERATOR BUILDING AIR HANDLING SYSTEM

Ventilation is provided to the South and West Vehicle Checking Facilities using a miniatureAir Handling Unit mounted in the Office ceiling void.


with cross-flow plate heat exchanger, panel filter sections and variable speed supply and

extract fans. Attenuation will be selected to meet the NR ratings specified on the room datasheet. Outside air intakes are to be provided with sand louvers and exhaust air points willhave non-return dampers and standard weather louvers.

Supply air will be ducted from the air handling unit to the plenum at the back of one of theducted VRF unit that is mounted on the OB TCR ceiling, and to the plenum at the back of

the ducted VRF that is mounted on the Bin Store ceiling. Extract air will be ducted to theunit via ceiling-mounted extract valves located in the kitchen and WC areas, each of which

will be provided with a commissioning damper.

The unit shall be capable of operating in a minimum of 2 modes (normal mode, setbackmode), with selection of the operating mode to be determined by a local BMS outstation.



21/21


MEP Specification

Under normal mode the unit will be controlled to maintain a constant air volume to eachroom. The variable speed drive on the extract fan motor will be used to set the initial

system air flow-rate during commissioning.


to the building.



{analogue/digital} associated with this AHU is 12 Nr.

4.13 ATHLETICS FACILITY GENERATOR BUILDING COOLING SYSTEM

1 no. DX cooling system will be provided to serve the Bin Store and 2 no. independent DX

cooling systems will be provided to serve the OB TCR. The heat rejection units will be

wall-mounted, in the recessed section of the Bin Store wall, concealing the units fromgeneral view.

The systems shall each operate in one of a minimum of 4 no. modes (cooling mode, heating

mode, heating setback and cooling setback), to be selected by a local BMS outstation. Thesystems shall each provide run/fault signals to be monitored by the BMS outstation.


The length of refrigerant and condensate pipework to be routed through the OB TCR will beminimised wherever possible.

Ceiling-mounted units shall be provided, each containing inverter-driven, variable speedfans. Outside air is ducted to a plenum built into the rear of the bin store unit and one of the

OB TCR units. The Bin Store and OB TCR room units should be separately controlled to

maintain independent room temperature setpoints to be determined by the BMS outstation.For the bin store, this shall be [15C] under cooling mode, [uncontrolled] under heatingmode, [30C] under cooling setback mode and [uncontrolled] under heating setback mode.

For the OB TCR, this shall be [25C] under cooling mode, [uncontrolled] under heatingmode, [30C] under cooling setback mode and [uncontrolled] under heating setback mode.


vrf system application

Documents