12 - hvac design brief

7/29/2019 12 - HVAC Design Brief

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Project: Commercial Complex @ Bangalore HVAC Design Brief

Architects1 Entask Consultancy Services (P) Ltd.

COMMERCIAL COMPLEX @ SARJAPUR ROAD, BANGALORE

HVAC DESIGN BRIEF
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INDEX OF CONTENTS

SL.NO. DESCRIPTION PAGE NUMBER

5.0 HVAC

5.1 GENERAL 3

5.2 SCOPE OF HVAC WORKS 4 - 5

5.3 DESIGN CRITERIA AND DESCRIPTION 6

5.4 CODES AND STANDARDS 7 9

5.5 HVAC DESIGN CONDITIONS 10

5.6 PROJECTED HVAC REQUIREMENT 11

5.7 EQUIPMENT DETAILS 12 25

5.8 SCHEMATIC DIAGRAMS 26

5.9 ELECTRICAL LOAD LIST 27

5.10 HEAT LOAD CALCULATION LIST 28 - 29

5.1 GENERAL
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THIS DOCUMENT BRIEFS ON THE HVAC SYSTEM ADOPTED FOR COMMERCIAL COMPLEX @ SARJAPUR

ROAD, BANGALORE.

COMMERCIAL COMPLEX is a Commercial Complex Development of built up area of approx. 7.67 lakh

Sq.ft. with three Office blocks, Parking, other common areas and utilities. It is proposed to design

the total infrastructure facility for the schedule of areas.

The schedule of areas is as follows.

SL.NO.

DESCRIPTIONAPPROX.

AREA (Sq. ft)PURPOSE

1 LOWER BASEMENT 287,995.0 Car Parking & STP

2 LOWER BASEMENT 187,995.0 Car Parking

3 UPPER BASEMENT87,995.0 Car Parking

4 GROUND FLOOR 1,10,407.0 Offices, Toilets, Electrical Rooms & Lobby

5 FIRST FLOOR43,710.0 Offices, Toilets, Electrical Rooms & Lobby

6 SECOND FLOOR43,710.0 Offices, Toilets, Electrical Rooms & Lobby

7 THIRD FLOOR43,710.0 Offices, Toilets, Electrical Rooms & Lobby

8 FOURTH FLOOR43,710.0 Offices, Toilets, Electrical Rooms & Lobby

9 FIFTH FLOOR43,710.0 Offices, Toilets, Electrical Rooms & Lobby

10

SIXTH FLOOR 43,710.0 Offices, Toilets, Electrical Rooms & Lobby

11 SEVENTH FLOOR43,710.0 Offices, Toilets, Electrical Rooms & Lobby

12 EIGHTH FLOOR43,710.0 Offices, Toilets, Electrical Rooms & Lobby

13 ROOF43,399.0 HVAC Plant area & Open Terrace

TOTAL AREA7,67,471.0

NOTE: ABOVE TABULATION SUBJECT TO CHANGE BASED ON REVISION OF ARCHITECT DRAWINGS

PROJECT DESIGN BRIEF

COMMERCIAL COMPLEX is a Commercial Complex Development of overall carpet area for air

conditioning works out to be 2.93 lakhs Sq. ft. excluding toilets and common areas like staircases

etc.

5.2 SCOPE OF HVAC DESIGN & WORKS
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SCOPE OF HVAC DESIGN

Chilled water central plant design consisting of Hybrid combination of Chillers, Pumpingsystem, Hydronic Pressure maintaining equipments, Chemical dosing system, Condenser cktfor Heat rejection by Cooling towers and to generate Chilled water which can deliver thedesired Airside Temperature of 23+/- 1 DEG C. on the Low side.

Chilled water & Condenser water pumping design with use of Variable frequency drive forSecondary chilled water pumps.

Chilled water, Condenser water & Condensate drain piping network with routing.

Space allocation of AHU and CSU Units for all the Floors showing Scheme Drawing of allusable spaces like OFFICE blocks and etc.

Common area Air Conditioning scheme.

Appropriate Fresh air distribution of to the Office AHUs to maintain Indoor Air quality.

BTU Metering and Tenant Billing system Design for enabling billing for End users based onactual consumptions.

Forced Ventilation system design for Toilets - 16 ACPH and for Sewage Treatment Plant.

Ductless Ventilation system for Basement floors CAR parking @ 04 ACPH for Normal mode,08 ACPH for Pollution mode and 30 ACPH for Fire Modes.

Air Pressurization system for escape routes in the Basement levels - Staircase and Lobby.

IBMS system integration of all HVAC Equipments and Control elements.

SCOPE OF HVAC WORKS

The central Heating, Ventilation and Air-Conditioning (HVAC) system shall comprise of following:

a) HIGH SIDE EQUIPMENTDesign of the equipment based on the data furnished in the document.

Procurement of materials within the battery limits as per the schedule given by Owner /

Project Managers.

Manufacturing as per standards & details furnished in the specifications.

Assembly.

Testing in Shop before delivery.

Inspection.

Insurance up to handing over.

Packing & Forwarding.

Transportation.

Installation at Site as per the schedule given by Owner/ PROJECT MANAGERS.

Submission of method statements for execution.

Commissioning in the presence of specialized agency (manufacturers representative).


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Performance Guarantee run.

Handing over.

b) LOW SIDE WORKS

Design of the equipment based on the data furnished in the document.

Procurement of materials within the battery limits as per the schedule given by Owner /

Project Managers.

Manufacturing as per specifications mentioned in the document.

Assembly at Site.

Commissioning.

Testing of all equipment as per the list attached in the document.

Performance Guarantee run.

Handing over.

Supply of various equipment as per the relevant Specification & Drawings, unloading, receiving,inspection, storing, transportation to work site, handling, assembling, cleaning, mechanicalerection, assisting main contractor in associated civil works which are required for ac system,Installation, alignment, testing and commissioning and handing over in working condition of allitems covered in the BOQ.

5.3 DESIGN CRITERIA & DESCRIPTION

FRESH AIR
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AS PER ASHRAE 62 N

Ideal air conditioning equipment should sanities cool, heat, humidify/dehumidify, evenlydistribution air through the area and all; cost effectively.

The world focus has shifted from the environment to Invironment. This is a new terminology,

being used increasingly to focus on the Indoor Air Quality (IAQ) and its effect on human health.While the outdoor environment continues to be of concern, the indoor environment is receivingincreased attention as more information has become available on the presence and effect of indoorcontaminants.

ASHRAE 62-1989 IAQ STANDARD:"VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY"

From the above chart it clearly states that 20 cfm / person is the desired rate of fresh air to

maintain good INDOOR AIR QUALITY (IAQ).

DESIGN ASSUMPTIONS

OCCUPANCY - 80 sqft / person on built up area i.e. as perArchitects area summary sheet

FRESH AIR - 20 cfm / person

LIGHTING LOAD - 1.5 watts /sqft

EQUIPMENT LOAD - 225 watts / Computer set

GLAZING - Double Glazing

STP WATERREQUIRED FOR WATERCOOLED CHILLERS - 30 KLD of Make-up water

5.4 CODES & STANDARDS


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Basically Air-conditioning system design shall be done as per latest ASHRAE Standards. Also otherapplicable Standards which shall be considered as guidelines are mentioned as under:-

AMERICAN SOCIETY FOR HEATING, AIR CONDITIONING & REFRIGERATION ENGINEERS(ASHRAE)

FRESH AIR AS PER ASHRAE STANDARDS IS WHERE EVER APPLICABLE SMACNA STANDARDS FOR SHEET METAL DUCTING UL STANDARDS FOR FIRE DAMPERS NBC STANDARDS WHERE EVER APPLICABLE ECBC STANDARDS

The installation shall conform in all respects to ASHRPROJECT MANAGERS / Indian Standard Code ofPractice for Air conditioning Installation, tender specifications and drawings.

In case of discrepancy among specifications, drawings and other documents, the specifications take

precedence over all other documents. In case of discrepancy between specification, drawings etc.,& Codes & Standards, the tenderer shall assume the more stringent of the two.

CODES & STANDARDS

Air Conditioning Equipment

IS 659 Safety Code for air conditioning

IS 660 Safety Code for mechanical refrigeration

IS 3615 Glossary of terms used in refrigeration & air conditioning

IS 5111 Testing of refrigeration compressors

IS 7896 Data for outside design conditions for air conditioning

IS 10617 Hermetic Compressors (Part-I, II & III)

IS 11338 Thermostats for use in refrigeration, air conditioners etc.SP 7 National Building Code (Group 4)

IS 3615 Glossary of terms used in refrigeration and air conditioning

IS 7896 Outside design data condition for AC design is for summer months

Noise & Vibration

IS 2264 Preferred frequencies for acoustical measurements.

IS 3483 Code of practice for noise reduction

IS 3932 Sound level meter for general purpose use.

IS 9736 Glossary of terms applicable to acoustics in buildings.

IS 9901 Measurement of sound insulation in buildings & building elements

IS 9876 Guide to the measurement of air borne acoustical noise &

evaluation of its effects on man.IS 10423 Personal sound exposure meter.

IS 11446 Measurement of air borne noise emitted by compressors unitsintended for outdoor use.

IS 12710 Glossary of terms used in acoustic emission testing.

IS 4758 Methods of measurement of noise emitted by machines

IS 14280 Mechanical vibration balancing shaft and fitment keyconvention

IS 12065 Permissible limits of noise level for rotating electrical machines.


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Pipe & Fittings

IS 638 Gaskets

IS 1239 Mild steel tubes & fittings

IS 5822 Code of practice laying of electrically welded steel pipes forwater supply.

Pump & Valves

IS 778 Copper alloy gate, globe & check valves for water workspurposes.

IS 4854 Glossary of terms for valves and their parts.

IS 5312 Swing check type non return valves.

IS 8092 Code for inspection of surface quality of steel castings for valves,fittings & other piping components.

IS 12969 Method of test for quality characteristic of valves.

IS 13095 Butterfly valves for general purposes.

Refrigerant Gas & Lubricants

IS 1447 Method of sampling and test for lubricants.

IS 4578 Lubricating oils for refrigeration machinery

IS 10609 Refrigerants

Number

DesignationSheet Metal Works

IS 277 Galvanized Steel sheet

IS 513 Cold rolled low carbon steel sheets.

Thermal Insulation

IS 334 Glossary of terms relating to bitumen & tar

IS 3069 Glossary of terms, symbols & units relating to thermal insulationmaterials

IS 3144 Mineral wool thermal insulation Methods of tests

IS 3346 Method of determination of thermal conductivity of thermalinsulation materials

IS 4671 Expanded polystyrene for thermal insulation purposes

International Standards

SMACNA HVAC Systems Duct Design

SMACNA HVAC Air duct leakage test manual

SMACNA HVAC duct construction standards Metal & flexible

SMACNA Rectangular duct construction

SMACNA Round duct construction

SMACNA Energy conservation guidelines.

SMACNA Energy recovery equipment and systems, air to air

ANSI-UL-555-1985 Fire dampers

ANSI Scheme for identification of piping system

SMACNA HVAC Systems Testing, adjusting & balancing

CTI Acceptance test code for water cooling towers, mechanical draft,natural draft, fan assistant type evaluation of results and thermaltesting of wet and dry cooling towers as per CTI-ATC-105- 1990

CTI Code of measurement of sound from cooling towers as per CTI-ATC-128

ANSI / AMCA Laboratory methods for testing fans for rating as per ANSI / AMCA210

UL Fire dampers as per ANSI-UL-555
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ASME Scheme for identification of piping system as per ANSI / ASME A-13.1

Drawings, Specifications and deviations

The drawings and specifications lay down minimum standards of equipment and workmanship.Should the tenderer wish to depart from the provisions of the specifications and drawings either on

account of manufacturing practice or for any other reasons, he should clearly draw attention in histender to the proposed points of departures and submit such complete information, Drawings andspecifications will enable the merits of the deviations to be fully appreciated. In the absence ofany such deviation list, it will be deemed that the tenderer is fully satisfied with the intents of thespecifications and the drawings and their compliance with the statutory provisions and local codes.All deviations or departures not brought out to the notice shall be disregarded.

Units of Measurement

HVAC design documents will generally use inch-Pound (IP) Units. In those instances where both SIand IP units are listed, the IP units take precedence of cooling and heating load calculations andequipment specification. The following listing indicates common application of Units ofMeasurement for HVAC Design Documents.

DUCTWORK SIZE : Millimetres OR Inches

PIPE SIZE : Millimetres OR Inches

AREA : Square feet OR Square meters

VELOCITY : Feet per minute OR Meter per Second

TEMPERATURE : Degrees F OR Degrees C

FAN/DUCT PRESSURE : Pascals (Pa) OR Inches of W.C.

PUMP PRESSURE : Meters OR Feet of Liquid - Water

AIR FLOW RATE : Cubic Feet/Minute - CFM OR Litres/Second - LPSLIQUID FLOW RATE : Gallons/Minute - GPM OR Litres/Second - LPS

5.5 HVAC DESIGN CONDITIONS


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INSIDE & OUTSIDE CONDITIONS:

LOCATION:

SITE LOCATION - BANGALORE

GEOGRAPHICAL LOCATION - 12.58 DEG N

ALTITUDE - 921 M ABOVE MEAN SEA LEVEL

The outside and inside conditions for the desired facility shall be designed based on below

mentioned parameters:

INSIDE CONDITIONS:

OFFICE BLOCKS

1) Dry Bulb Temperature - 23 +/- 1 DEG C.

2)Relative Humidity - Less than 60%

The air conditioning system for the Commercial Complex facility shall be designed to cater for the

Comfort cooling application only.

OUTDOOR DESIGN CONDITION:

SUMMER DRY bulb temp 35.6 DEG C WET bulb temp 25.6 DEG C RH-45 %

MONSOON DRY bulb temp 27.8 DEG C WET bulb temp 25.6 DEG C RH -82 %

WINTER DRY bulb temp 14.4 DEG C WET bulb temp 12.2 DEG C RH -78 %

5.6 PROJECTED HVAC REQUIREMENT IN TR


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Sl.No.Floor

Reference

Description of

Application

Carpet Area

AC (sq ft)Occupancy

TR as per

HeatloadCFM Fresh Air

Block-A - Office 10,092.9 126 52.86 24,997 2,523

Block-B - Office 9,716.3 121 49.80 23,394 2,429

Block-C - Office 16,043.2 201 81.13 37,952 4,011

Block-A - Office 9,027.6 113 49.48 23,709 2,257

Block-B - Office 8,823.2 110 43.68 20,292 2,206

Block-C - Office 16,043.2 201 82.83 38,999 4,011

Block-A - Office 10,867.6 136 55.61 26,110 2,717

Block-B - Office 8,855.5 111 43.79 20,334 2,214

Block-C - Office 16,710.3 209 85.06 39,870 4,178

Block-A - Office 10,867.6 136 55.61 26,110 2,717

Block-B - Office 8,855.5 111 43.79 20,334 2,214

Block-C - Office 16,710.3 209 85.06 39,870 4,178

Block-A - Office 10,867.6 136 55.61 26,110 2,717

Block-B - Office 8,855.5 111 43.79 20,334 2,214

Block-C - Office 16,710.3 209 85.06 39,870 4,178

Block-A - Office 10,867.6 136 55.61 26,110 2,717

Block-B - Office 8,855.5 111 43.79 20,334 2,214

Block-C - Office 16,710.3 209 85.06 39,870 4,178

Block-A - Office 10,867.6 136 55.61 26,110 2,717

Block-B - Office 8,855.5 111 43.79 20,334 2,214

Block-C - Office 16,710.3 209 85.06 39,870 4,178

Block-A - Office 10,867.6 136 55.61 26,110 2,717

Block-B - Office 8,855.5 111 43.79 20,334 2,214

Block-C - Office 16,710.3 209 85.06 39,870 4,178

9 Eighth Floor Block-A - Office 5,433.8 68 25.01 11,332 1,358

293,780.6 3,672.26 1,491.52 698,561 73,445Grand Total

Sixth Floor7

Seventh Floor8

Third Floor

5 Fourth Floor

Fifth Floor6

SUMMARY OF AC TONNAGE LOADS

PURVANKARA COMMERCIAL COMPLEX PROJECT, SARJAPUR ROAD, BANGALORE

Ground Floor

First Floor

Second Floor

1

2

3

4

The overall AC load estimate works out to be about 1492.0 TRand by applying the diversity, it isproposed to install 1300.0TRof air conditioning plant.

A centralized air conditioning system is proposed with a hybrid combination ofAIR COOLED SCREWCHILLERSof 300TR x 3nos. + 200TR x 2nos. WATER COOLED SCREW CHILLERS with Chilled &Condenser water Pumping system, Hydronic Pressure maintaining equipments, Chemical dosingsystem and Condenser ckt for Heat rejection by Cooling towers.

5.7 EQUIPMENT DETAILS


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HVAC SYSTEM PROPOSED

Based on the data furnished in the Design Basis, the air conditioning area for the Building works outabout 2,93,780Sq.ft. excluding toilets and common areas like staircases etc. As such, the capacityof the air conditioning plant required works out to around 1492.0TR. Applying the diversity factorof 0.87, it is proposed to install 1300.0TRof air conditioning plant. A centralized air conditioning

system is planned with a hybrid combination ofAIR COOLED SCREW CHILLERSof 300TR x 3nos. +200TR x 2nos. WATER COOLED SCREW CHILLERS with Chilled & Condenser water Pumpingsystem, Hydronic Pressure maintaining equipments, Chemical dosing system and Condenser cktfor Heat rejection by Cooling towers.

v The chilled water plant consisting of Water cooled chillers system shall utilize treated watergenerated from the STP for make up water requirement.

v The pumping system shall comprise of Primary, Secondary and Condenser water pumps.v Secondary pumping system shall be with Variable speed pumps with VFD application to

save energy during diversified load.

vThe chilled water generated shall be metered by means ofBTU METERS.

v The overall make up water required for Water cooled plant of400TRcapacities is around30 KLD which is fed from the treated STP water.

v The chiller plant shall be placed in the Terrace of the building. The Water cooled chillersand pumping system shall be housed inside a closed roof.

v The reason for a combination ofchillers is as per the loading pattern and difference in DB(Dry bulb) and WB (WET bulb) is very marginal, Hence chillers without VFD are envisaged.

SYSTEM DESCRIPTION

The overall load is generated by Centralized chilled water plant which is housed in the Terrace ofthe building. The chilled water generated shall be distributed to each floor by means of variablespeed pumping system.

The centralized chilled water generation plant consists of the following equipments:

CHILLERS

On-going performance verification of chiller capacity and power input is by means of certifiedcomputerized selection output to assure the owner of specified performance in accordance with thelatest version of ARI Standard 550/590 and EUROVENT STANDARDS.

All chillers that fall within the scope of the certification program have an ARI certification label atno cost to the owner. Equipment covered by the ARI certification program include all water-cooled

centrifugal and screw water chilling packages rated up to 2000 tons (7,000kW) for 60 hertz serviceat ARI standard rating conditions, hermetic or open drive, with electric driven motor not exceeding5000 volts, and Cooling water (not glycol). For 50 hertz application the capacity range covered is200 to 1,000 tons (700 to 3500 kW).

Published certified ratings verified through testing by ARI include:

v Capacity, tons (kW)v Power, kW/ton (COP)v Pressure drops, ft. of water (kPa)


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v Integrated Part Load Value (IPLV) or Non-Standard Part Load Value (NPLV)As part of the ARI certification program, ARI has computer selection program used to select and ratechillers. The certified computer program version number and issue date for all manufacturers islisted in the ARI Directory of Certified Applied Air-Conditioning Products available on www.ari.org.ARI Standard 550/590-98 for Centrifugal or Screw Water - Chilling Packages and associated manualsdefine certification and testing procedures and tolerances of all units that fall within the

application rating conditions.

DESIGN PARAMETERS FOR CHILLER SELECTION

The standard rating conditions are:

Leaving chilled water temperature ...........................44FEvaporator waterside field fouling allowance ............0.0001Chilled water flow rate ............................................2.4 gpm/tonEntering condenser water temperature .....................85FCondenser waterside field fouling allowance.............0.00025 (for Water cooled chillers)Condenser water flow rate .....................................3.0 gpm/ton (for Water cooled chillers)

Air cooled screw chiller

Air cooled screw chillers, which are largely used in the comfort cooling industry, the chillerpackage shall consist of compressor-motor units, condenser coils, condenser fans, chiller, receiver,refrigerant piping & fittings, refrigerant feeding devices, valves, strainer, liquid moisture indicator,suction line insulation, first charge of oil & gas, starter panel & Micro-processor panel etc., all thecomponents being mounted on welded steel base frame; the base frame, structural profiles &panels made of galvanized sheet steel (GSS) shall be protected with primary coating & finished

with acrylic paint. The Chillers shall be suitable for outdoor installation; in other words, noweather protection of any kind by way of wall or roof is contemplated. The starter panel shall besuitable for outdoor application & shall confirm IP - 55 grade of protection. The panel shallincorporate main disconnect switches & fuses for individual motors, contactors, over load relays,single phase preventers, under/ over voltage trip, on/off push buttons, auto manual switches tofacilitate automatic operation through DDC System or for manual operation to facility forremote starting & stopping of chiller packages, auxiliary contactors, etc. if any required.


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Water cooled screw chiller

Water cooled screw chillers, which are also largely used in the comfort cooling industry, the unitshall be completely factory assembled and wired in a single package complete with screwcompressor(s), cooler, condenser, starting control, safety and operating controls, refrigerant piping& fittings, refrigerant feeding devices, valves, strainer, liquid moisture indicator, suction lineinsulation, first charge of oil & gas, starter panel & Micro-processor panel etc,. The unit shall beconstructed from heavy gauge galvanized steel and steel "C" channel with built-in skid and lifting

holes.

EvaporatorEvaporator shall be direct expansion, shell and tube type. The shell is fabricated from seamlesscarbon steel pipe, with finned copper tubes and tube sheets of heavy gauge carbon steel. Thec o o l e r s h a l l b e i n s u l a t e d w i t h c l o s e d c e l l f o a m e d r u b b e r i n s u l a t i o n .

CondensersCondensers shall be shell and tube type and the condensers shall have removable heads on bothends for tube cleaning and servicing. The condensers shall be leak tested at working pressure andinclude relief valves and purge valves.

CompressorThe overall compressor design shall include a suction cooled motor, integral lubrication systemutilizing compressor pressure differential and semi-hermetic design. The casing is to be constructedfrom a high strength iron casting. An electric crankcase oil heater shall be provided to maintain theproper oil temperature when the system is not in operation.

COOLING TOWER SYSTEM

INDUCED DRAFT CROSS FLOW TYPE COOLING TOWERS WITH LOW NOISE AND CTI APPROVED
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DESIGN CRITERIA

Cooling tower thermal performance shall be certified by the Cooling Tower Institute in accordancewith CTI Certification Standards STD-201label at no cost to the owner.

The cooling towers shall be of Cross flow, Induced-draft vertical discharge type, in rectangularsingle or multi-cell configuration complete with Motor, Fan, Hand rails, Ladder and other

accessories etc. and designed with high efficiency drift eliminators to meet current environmentalstandards and guidelines for microbial control. It should be possible to hook up to BMS. Thedistribution system shall be gravity-feed type fitted with removable target nozzle to ensure equalwater distribution over the fills. Drift eliminators shall be efficient enough to effectively limit driftloss to no more than 0.005% of the designed flow rate.

Storage capacity that needs to be planned for make up water should be at least one dayconsumption.

PUMPING SYSTEM

Pump

The chilled water generated by the chiller plant shall be pumped to the respective floor AHUs unitsand load cells by means of secondary pumping system.The Chilled Water Pump Sets shall be back-pull out design fitted with variable frequency drive (VFD)for Secondary system. The pump shall be complete with ribbed cast iron casing, double shroudedsingle entry radial flow bronze impeller, mechanical seal, bearing bracket incorporating 2 nos.roller bearings, shaft, longer coupling, coupling guard, flanged connections for discharge andsuction, purge /air vent/test cocks, etc

Regulatory requirements of Pumps

Conform to Health/Life Safety Code for Public Schools Conform to International Mechanical Code Conform to BOCA National Building Code Conform to BOCA National Fire Protection Code Conform to State of Illinois Plumbing Code Conform to National Electric Code NFPA 70 Conform to Illinois Accessibility Code Conform to applicable ANSI/HI standards Products: Listed and classified by Underwriters Laboratories, Inc. as suitable for the

purpose specified and indicated.


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DESIGN REQUIREMENTS

The power ratings of the pump motor shall be larger of the following:

The maximum power required by the pump from zero discharge to zero head. 110% of the power required at the duty point.

Pumps of a particular category shall be identical and shall be suitable for parallel operation withequal load division. Components of identical pumps shall be interchangeable.

Pump Logic Controller (should be fully compatible to hook up to BMS / Chiller Plant ManagementSystem)

The technologic pump logic controller assembly shall be listed by and bear the label ofUnderwriters Laboratory, Inc. (UL)

The Equipment should be able to hook up to chiller plant management system (BMS) viasoftware integration either in ASHRAE Backnet / RTU Modbus Protocol. Necessaryhardware / software for integration should be part of scope.

The controller shall be specifically designed for variable speed pumping applications. The controller shall function to proven program that safeguards against damaging

hydraulic conditions including:

Pump flow surgesHuntingEnd of curveSystem over pressure

The pump logic controller shall be capable of receiving up to two discrete analog inputsfrom zone sensor / transmitter as indicated on the plans. It will then select he analoguesignal that has deviated the greatest amount from its set point. This selected signal willused as the command feedback input for a hydraulic stabilization function to minimizehunting. Each input signal shall be capable of maintaining a different set point value.Controller shall be capable of controlling up to three pumps in parallel.

The pump logic controller shall be capable of accepting an additional analog input for aflow sensor. This input shall serve as the criteria for the end of curve protectionalgorithm.

The pump logic controller shall be self-prompting. All messages shall be displayed inplain English. The operator interface shall have the following features:

a) Multi-fault memory and recall last 10 faults and related operational data.b) Red fault light, yellow warning light and Green power on light.c) Soft-touch membrane keypad switches.

The pump logic controller shall be of a high end type i.e., all the parameters availableon the logic control panel should be able to monitor / controlled from the remotelocation and should housed in a NEMA 1 Enclosure.


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The display shall have four lines, with 20 characters on three lines and eight large characters on oneline. Actual pump information shall be displayed indicating pump status.

VARIABLE FREQUENCY DRIVE ENABLED SECONDARY PUMPS have been adopted for PROPOSEDCOMMERCIAL COMPLEX FOR RAMKY.

Secondary pumping would enable Substantial energy savings due to partial load profile during offpeak hours.

Adjustable Frequency Drive

The adjustable frequency drives shall be pulse width modulation (PWM) type,microprocessor controlled design.

VFD Shall is Danfoss VLT 6000 Series / ABB ACH 550 Series only. The AFD, including all factory-installed options, be tested to UL standard 508. The AFD

also meets C-UL and is CE marked and builds to ISO 9001 standards.

The AFD shall be housed in a NEMA 1 enclosure. AFF with plastic enclosure shall not beacceptable.

The AFD shall employ an advanced sine wave approximation and voltage vector control toallow operation at rated motor shaft output speed with no derating. This voltage vector

control shall minimize harmonics to the motor to increase motor efficiency and life.

Power factor shall be near unity regardless of speed or load.

The VFD shall have balanced DC link reactors to minimize power line harmonics. VFDswithout a DC link reactor shall provide a 3 % impedance line reactor.

Input and output power circuit switching can be done without interlocks or damage to theVFD.


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BASEMENT DUCTLESS VENTILATION SYSTEM

Car Park Ventilation System for Upper Basement, Lower Basement 1 and 2

Height(m)

Area(m

2)

Volume(m

3)

Upper Basement 3.9 6,783 26,454

Lower Basement 1 3.1 6,894 21,372

Lower Basement 2 2.9 7,283 21,120

Car park details

The car parking comprises of three Basement Floor cars parking with entrance & exit openings.

The fresh air coming from the ramps of the Lower Ground level to the Upper Basement is sufficient.

Incase of Lower Basement 1 and 2 the fresh air from the ramps are not sufficient and hence supplyair fans are required for lower basements 1 and lower basement 2.

The Car Park system if designed for 04 for Normal mode, 08 ACPH for Pollution mode and 30 ACPHfor Emergency mode.

Upper Basement (Air Changes per Hour - ACPH):

Normal Mode : 4 (ACPH) X 26,454 / 1.7 = 62,250 CFMPollution mode : 8 (ACPH) x 26,454 / 1.7 = 1,24,500 CFMFire mode : 30 (ACPH) x 26,454 / 1.7 = 4,66,830 CFM

Lower Basement 1 (Air Changes Per Hour - ACPH):

Normal Mode : 4 (ACPH) X 21,372 / 1.7 = 50,285 CFMPollution mode : 8 (ACPH) x 21,372 / 1.7 = 1,00,570 CFMFire mode : 30 (ACPH) x 21,372 / 1.7 = 3,77,145 CFM

Lower Basement 2 (Air Changes Per Hour - ACPH):

Normal Mode : 4 (ACPH) X 21,120 / 1.7 = 49,700 CFMPollution mode : 8 (ACPH) x 21,120 / 1.7 = 99,400 CFMFire mode : 30 (ACPH) x 21,120 / 1.7 = 3,72,720 CFM

Since the car park is envisaged to have a common extract shaft, we have considered the following.

Extract Fan Selections for Upper Basement, Lower Basement 1 and 2:

We have taken a DIVERSITY FACTOR that fire will happen in Single basement only. Hence, thesystem is designed for Emergency mode in the Largest Basements i.e. 30 ACPH (1st Basement) -4,66,830 CFM which also ensures 8 ACPH during Normal mode in all 3 basements.

No. of Extract shaft : 4 No.No. of Fans in each shaft : 3 NosTotal No. of Extract Fans : 4 x 3 = 12 Nos.Capacity of each Extract fan : 4,66,830 / 12 = 39,000 CFM @ 25 mm WC.


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Each Extract Fan Shaft Size : 6 X 2 Metres.For Lower Basement 1:

No. of Supply shaft : 2 Nos.No. of Supply Fans / Shaft : 2 Nos.Total No. of Supply Fans : 2 x 2 = 4 NosCapacity of Supply fan : 20,000 CFM 25 mm WC.

Supply Fan Shaft Cut Out Size : 3.25 X 2 Metres.

For Lower Basement 2:

No. of Supply shaft : 2 Nos.No. of Supply Fans / Shaft : 2 Nos.Total No. of Supply Fans : 2 x 2 = 4 NosCapacity of Supply fan : 20,000 CFM 25 mm WC.Supply Fan Shaft Cut Out Size : 3.25 X 2 Metres.

Jet Fan and Extract Fan System Description:

PPM LevelACPH Jet Fan

Total No. of Extract Fans 12 Nos.

0-25 ppm 4 Off 4 Fans will operate

25 ppm 8 Low Speed 8 Fans will operate

Emergency Mode 30 High Speed All 12 Fans will operate

0-25 ppm: When the CO level in the car park is between 0-25 ppm the Jet Fan are in the Off mode,4 Nos. of Extract fans will be running to achieve 4 ACPH in all 3 Basements.

> 25 ppm: When the CO level in the car park is greater than 25 ppm the Jet Fans will be operatedat Low speed and 8 Nos. of extract fans will be running to achieve 8 ACPH in all 3 Basements.

Emergency mode: During the emergency mode the Jet Fans will be operated at full speed,12 Nos. of extract fans will be running to achieve 30 ACPH in the Basement where smoke is to beremoved quickly.


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Extract Fan Selections for Parking Upper Basement, Lower Basement 1 and 2:

Note: The Extract Fans are designed for 300 Degree C for one hour

BEFORE CFD ANALYSIS AFTER CFD ANALYSIS AND JETFANPOSITIONING

Our Ref: TAP/CP/B/2007/ 098 Dt: 06 / 10 / 2007

Units Specifications

Qty. Nos 12

Duty Volume CFM 39,000

Static Pressure mmWC 25

Selected Model HT 125 JM / 40 /6 / 9 / 25

Blower Type Axial Fan

Fan Diameter mm 1250

No of Blades 9

Fan Casing Long

Absorbed Shaft Power KW 10.74

Shaft RPM RPM 960

Recommended High Temperature Motor Single Speed KW 15 KW / 6pole

Sound Level @ 3 Metres Dba 76


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Supply Fan Selections Lower Basement 1:

Note: the Supply fans are designed for 50 Degree C

Units SpecificationsQty. Nos 2



Selected Model 100JM / 40 / 6 / 9 / 32



No of Blades 9

Fan Casing Long


Shaft RPM RPM 960

Recommended Motor Single Speed KW 7.5 KW / 6 Pole


Sound Level after Silencer Dba 60


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Supply Fan Selections Lower Basement 2:

Units SpecificationsQty. Nos 2



Selected Model 100JM / 40 / 6 / 9 / 32



No of Blades 9

Fan Casing Long


Shaft RPM RPM 960

Recommended Motor Single Speed KW 7.5 KW / 6 Pole


Sound Level after Silencer Dba 60


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SPECIFICATIONS FOR JET FANS

Technical Data / Technical specifications of the JET THRUST FAN UNIT offered

Qty required : Upper Basement+Lower Basement 1+Lower Basement 2 =23+23+24 = 70 Nos.

Jet fans are with silencers & mounting assembly

JETFAN

Sound level is measured at 1.5-meter distance in reference value in parking areas

Note: The jet fans are designed for 300 Degree C for one hour

Overall system description:

The vehicle entrance & exit ramps shall be utilized as the main source of fresh air into the carpark for First Basement.

It is proposed the extract points are located as shown on the marked drawing enclosed to you inseparate mail. The location of these extract points have been chosen to ensure the bestdistribution of the inlet airflow as possible and suitability for a system comprising of Jet Fanunits as per the geometry of the Car Parking Area.

No. Description Unit Technical details

1 Nozzle Dia Mm 350 mm

2 Air Flow M3/sec 0.9/1.8 m3/sec @ 4 / 2 Pole

3 Capacity of Fan Cfm 1905 / 3810 Cfm

4 Tip Velocity m/s 16

5 Phase Ph 3

6 Voltage V 420

7 Frequency Hz 50

8 Revolution RPM 1420 /2840RPM

9 Ampere A 0.63 / 2.38 @ 4 / 2 Pole

10 Sound Level dB (A) 53 / 65 @ 4 / 2 Pole

11 Weight Kg 80

12 Power Consumption KW 0.1 KW / 1.0 KW @ 4 / 2 Pole

13 Rated Motor Power Kw 0.14 KW / 1.1 KW @ 4 / 2 Pole

14 Depth of Unit Mm 455 mm

15 Thrust Nm 8/32


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Extract grilles would be located at high level. In case of main power failure the Extract Fans shall be provided with alternate source of power. All of the fans will be controlled via PLC based control panel separately for each Basement. The

logic shall be arrived separately for pollution mode and emergency mode separately. Aninterlink will need to be provided to allow communication between panels and also the BMS.

For the Pollution mode it is proposed that the extract fans in all Basements Floor are operatedto provide 8 ACPH. It is suggested that a Carbon Monoxide (CO) detection system is provided tocontrol the background ventilation rate depending on car park usage and detected levels of CO.Details of a suitable detection head for this application can be provided if required. The type ofdetector that would be recommended is an analogue type detector with a 4-20mA signal. Thiswill allow for detection of varying levels of CO, typically in the ranges 0-30, 30-50, >50 PPMwhere the frequency of supply to the main fans can be adjusted accordingly via the main controlpanel.

Jet Fan units would be installed at ceiling level and positioned accordingly within the car park toprovide the best distribution of the inlet air flow as possible.

The final installed locations of the Jet fans and mode of operation of these fans would bedetermined at the time of the detailed design in which techniques of Computational FluidDynamics (CFD) will be used to model the air movement with the car park. A more detaileddescription of the CFD to be carried out can be provided upon request.

Control equipment:

(8+8+8) 24 Nos. for basement floor On / off type carbon monoxide (CO) detection. With COdetection in place the ventilation system would run on demand during peak periods when there ishighest car park activity. The benefit of this over the conventional approach is ventilating all thetime at 6 ACPH will be seen in reduced operating costs and noise levels.

Incoming electrical supply

Dual Incomer

CO GAS DETECTOR

KEY ELEMENTS OF DESIGN IN VIEW TO ACHIVE ENERGY SAVINGS:

System with combination of Air cooled and Water cooled screw chillers. Chillers with R-134a Eco-friendly Refrigerant gas. Variable speed Pumping to save energy during diversified loads of Offices. Use of IBMS system to run the system efficiently by close monitoring and trends.
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ENERGY CONSERVATION AND ENVIRONMENTAL CONCERN

WITH THE INCREASE IN DEMAND OF ENERGY CONSUMPTION, I.E ELECTRICITY, THEAVAILABILTY OF POWER BECOMES A MAJOR CONCERN.

SINCE THE CONSUMPTION OF POWER IS DIRECTLY RELATED TO GENERATION USING FOSSILFUELS, IT

S EVIDENT THAT IT IS HARMFUL TO THE ENVIRONMENT. HENCE THE DESIGN ADOPTED FOR THIS COMMERCIAL COMPLEX IS IN VIEW OF NOT ONLY

ATTAINING MAXIMUM DEMAND POWER FOR HVAC TO BE ECONOMISED, BUT ALSO TO HAVE

ENERGY EFFICIENT SYSTEM.

APPROVED MAKES OF MATERIALS

AIR / WATER COOLED CHILLERS

COOLING TOWERS

AHUS / CSUS / FCUS TFAS

PRIMARY & CONDENSER WATERPUMPS

SECONDARY PUMPS

CLOSED LOOP EXPANSION TANK

AIR SEPERATOR / AUTO AIRVENT

MS PIPE

BUTTERFLY VALVES

PRESSURE INDEPENDENT BALANCINGCUM CONTROL VALVES

Y STRAINER / SUCTION GUIDE

NON RETURN VALVE

PPRESSURE GAUGE & THERMOMETER

RPUF INSULATION

INLINE FANS

GI SHEET

GRILLES & DIFFUSERS / VCD / FIREDAMPER

CLOSED CELL NITRILE RUBBERINSULATION


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5.8 SCHEMATIC DIAGRAMS

HEAT LOAD SUMMARY

The overall AC load estimate works out to be about 1492.0 TRand by applying the diversity, it isproposed to install 1300.0TRof air conditioning plant.