Thermal Store Energy Bank

Storage Tanks

Thermal Store Energy Bank

The Evinox Thermal Store Energy Bank is the perfect choice for storing energy for use in renewable heating and hot water systems. The innovative heat transfer technology within the Thermal Store transfers energy generated by renewable sources via the heat exchanger to the Energy Bank for the fast supply of hot water. With standard tanks ranging from 350L to 3000L there is a capacity to suit most sizes of system.

The Thermal Store can be used to capture energy from a variety of renewable and fossil fuel heat sources, such as solar, heat pumps, biomass and CHP, and is capable of providing hot water at varying temperatures to suit different heat emitters within a building. For example the Thermal Store can supply an underfloor heating system that may require 40°C, radiators requiring 70°C and hot water at 55°C, all from the same unit.

Unique TechnologyThe Thermal Store Energy Bank includes unique patented technology that enables the hot water to be transferred from the bottom to the top of the store via a heat transfer tube, where it can then be used almost immediately without waiting for the remaining water in the tank to be heated. This ensures for example that there is hot solar heated water available for an early morning shower, even after just a short exposure to the morning sun.

In contrast, with traditional solar buffer storage tanks, the solar heated water enters from the bottom of the buffer, and rises to the top of the tank from where it can be drawn off. The disadvantage of this process is that it takes a very long time for the whole tank to be heated, from the bottom to the top, and only when all of the water is heated can it be used to provide the building with hot water.

To circulate water from the bottom to the top of a storage tank, other manufactures use a variety of circulating pumps and control systems. These items require energy and maintenance, which in turn produce extra costs. This is not required in the Evinox Thermal Store

• Unique technology ensures the tank is fully charged to the required temperature in a short space of time, even when only a limited amount of energy is available.

• Integrates effectively with all renewable energy sources.

• Through the principle of gravity working from top to bottom, an optimised use of energy is guaranteed.

• Excess energy can be used for heating purposes.

• The heat transfer technology does not require any circulating pumps, control systems or additional heat exchangers, making it a low energy system.

• Using a storage tank for heating water reduces environmental impact.

• Instantaneous fresh hot water is provided without the possibility of legionella.

• Winner of H&V News Award for Industrial and Commercial Product of the Year when launched, and a finalist for The Sustainable Building Services Awards.

• Stores can be manufactured in tailor-made sizes up to 20000 litres to suit any application.

Benefits

Thermal Store Energy Bank

Fresh hot and cold water provided when requiredIn conventional buffer tanks where water is not replaced with a fresh supply on a daily basis, the quality of water cannot be guaranteed to be clean, fresh and free from bacteria. After just 24 hours the quality of stored water considerably deteriorates.

This can lead to a risk when showering, in that any bacteria present can be inhaled, causing health problems.

The Thermal Store ensures that water is continually circulated and only heated as’ required to provide fresh, clean and safe hot and cold water.

Thermal Store heat exchanger• Outer skin constructed from copper to provide excellent thermal heat transfer

• Inner skin is tin-coated to prevent the build-up of bacteria.

Infrared illustration showing the controlled heat transfer into an S-PD 1500 (Buffer storage =1500 Ltr.)

The beginning of heating transfer.

After only 2 hours of sun on Solar collectors hot water is available for use.

The final phase of the heat transfer process allows any excess heat to be used for heating purposes.

Optimal use of renewable energy with the powerful heat transfer technology

Heat Transfer TubeSolar Coil

Instantaneous Hot Water Production Coils

Baffle

3

S-PD Storage Tank for Solar Applications

ROOM CONTROLLER

SOLARCONTROLLER

BOILER

MCWS SUPPLY

SECONDARY HOT WATER

THERMAL STORE

OUTLET HOT WATERHEATINGCIRCUIT

GLYCOLFILL POINT

SOLARCIRCULATION UNIT

Q5

Due to the unique specification of the patented multi buffer storage system, optimal use of solar energy is guaranteed.

Should the system not incorporate solar thermal initially but you wish to integrate solar collectors into the heating system at a later date; the store can be provided and equipped for the future addition of the solar coil for simple conversion on site.

• Capable of integrating alternative energy sources e.g. solid fuel, electricity, use of ambient temperature via heat pumps.

• Optional pre-heat exchanger can increase energy input from solar collectors by up to 15%, resulting in a higher rate of hot water production.

• Instantaneous fresh hot water is provided without the possibility of legionella.

• Heat exchanger available in various sizes to suit hot water requirements.

• Extremely low thermal losses due to 120mm thick complete insulation made from CFC- free foam.

• Robust and hard wearing outer skin.

Solar Thermal Typical System Schematic

TypeHot water

tankAvailable Hot

water*Measurements/mm Weight Tilting height

with insulation without insulationLtr. Ltr. height Ø height Ø kg mm

S-PD 350 350 150 - 275 1575 850 1450 600 148 1575S-PD 450 450 200 - 350 1895 850 1770 600 159 1875S-PD 600 600 250 - 450 1875 950 1750 700 196 1890S-PD 750 750 320 - 625 1855 1040 1730 790 224 1910S-PD 900 900 400 - 750 2175 1040 2050 790 249 2205S-PD 1000 1000 420 - 830 2305 1040 2180 790 266 2320S-PD 1250 1250 500 - 1000 2075 1250 1950 1000 362 2200S-PD 1500 1500 600 - 1200 2355 1250 2230 1000 406 2450S-PD 1750 1750 700 - 1400 2105 1450 1980 1200 456 2335S-PD 2000 2000 800 - 1600 2375 1450 2250 1200 496 2555S-PD 2500 2500 1000 - 2000 2375 1550 2250 1300 557 2610S-PD 3000 3000 1200 - 2400 2375 1650 2250 1400 619 2665

* storage temp. 65°C, cold water temp. 10°C and an average warm water temp. 40°C

Store and Coil Sizing Chart

Energy Bank Storage Tank

Dia. (mm)Maximum Solar

collector area (m²)WT 2.3 Solar from

600mm Dia.WT 3.2 Solar from

790mm Dia.WT 4.1 Solar from

1000mm Dia.S-PD 350 600 15 1 - -S-PD 450 600 15 1 - -S-PD 600 700 15 1 - -

S-PD 750 79015 1 - -30 - 1 -

S-PD 900 79015 1 - -30 - 1 -

S-PD 1000 79015 1 - -30 - 1 -

S-PD 1250 100015 1 - -30 - 1 -40 - - 1

S-PD 1500 1000

15 1 - -30 - 1 -40 - - 155 - 2 -

S-PD 1750 1000

15 1 - -30 - 1 -40 - - 155 - 2 -70 - - 2

S-PD 2000 1200

15 1 - -30 - 1 -40 - - 155 - 2 -70 - - 2

S-PD 2500 1300

15 1 - -30 - 1 -40 - - 155 - 2 -70 - - 2

S-PD 3000 1400

15 1 - -30 - 1 -40 - - 155 - 2 -70 - - 2

1. For 40 l/min use 2 of WT 50 Cu heat exchangers +1 WT 36 Cu pre-heat exchanger

2. For 60 l/min use 4 of WT 40 Cu heat exchangers +2 WT 36 Cu pre-heat exchangers

3. Size the energy storage bank according to the table showing the capacity of Thermal Storage Bank according to the solar collector area.

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S-WP-PD Storage Tank for Heat Pump Applications

When using a heat pump as the main energy source in a heating system, our Thermal Store hot water transfer technology guarantees a longer working life for the heat pump and ensures that it operates at maximum performance efficiency.

The efficiency of a heat pump is reduced the higher the temperature of hot water that is required. In addition to this, the warmer the water is that is fed into the reverse heat pump flow, the less efficient the heat pump is due to the increased amount of electricity that is required.

The Evinox Thermal store incorporates a buffer plate that divides the tank into two zones. The lower zone is used for heating purpose and operates with water up to 45°C, enabling the heat pump to work with a higher COP of 4.

The upper zone in the tank is used for domestic purposes and operates with water up to 60°C. At this higher temperature the heat pump works at a reduced COP.

The stratification system within the tank (the plate and the tubes) draws the water up from the lower zone, where the water is very efficiently heated, to the upper zone. Simultaneously this creates a zone of cold water in the lower part that is fed into the return connection of the heat pump. Both factors increase the efficiency of the heat pump therefore reducing electricity usage.

Via the zone of cold water in the lower part of the tank the heat pump can work constantly, with no stop/start, which reduces the strain significantly and increases the life of the pump.

The S-WP-PD heat pump store is supplied flitted with a blanking flange to enable the future addition of a solar heat exchanger, should it be required.

• Optimal and efficient operation of the heat pump

• Instantaneous fresh hot water is provided without the possibility of legionella.

• Heat exchanger available in various sizes to suit hot water requirements.

• Extremely low thermal losses due to 120mm thick complete insulation made from CFC- free foam.

• Robust and hard wearing outer skin.

Model Hot water

tankAvailable Hot

water*Dimensions mm Weight Tilting height

with insulation without insulationLtr. Ltr. height Ø height Ø kg mm

S-WP-PD 750 750 1951¹ - 2952² 1855 1040 1730 790 246 1920S-WP-PD 900 900 2451¹ - 3702² 2175 1040 2050 790 271 2205S-WP-PD 1250 1250 3351¹ - 5202² 2075 1250 1950 1000 376 2200S-WP-PD 1500 1500 3901¹ - 6202² 2355 1250 2230 1000 416 2450

*Based on a water usage/ 20 Ltr./min.1: ¹48°C storage tank temp. ²53°C storage tank temp. 40°C average water temp.

Infrared illustration shows the changes in conditions when drawing water in a Thermal Store heat pump application.

A fully heated store showing the beginning of the water drawing process (via pre-and intermediate heat exchanger)

As water is drawn out of the upper part of the store via the heat exchangers, 2 cold storage zones are created, which then enter into the return connection of the heat pump.

Hot water from the heat pump enters the lower part of the store and immediately goes to the top of the tank via the stratification tube, where it can be withdrawn for domestic hot water.

Heat Pump Typical System Schematic

PUMPBUFFERVESSEL

DECOUPLING BOTTLE

THERMAL STOREZONEVALVE

BALANCINGVALVE

MCWS SUPPLYBALANCEDCOLD WATER SUPPLY

P.REGULATINGVALVE

WALL OFBUILDING

ZONEVALVE

TOPSENSOR

MIDDLESENSOR

BOTTOMSENSOR

BOILER

HEATINGCIRCUIT

COOLING CIRCUITTO FCU’S OR CENTRAL

VENTILATION PLANT

GASIVIV

NRV

IVIVIV

SECONDARYRETURN PUMP

SECONDARY HOT WATER

OUTLET HOT WATER

MIXINGVALVE

DRVPRV

NRVNRV

NRV

IV

PUMP

IV

IV

IV IV IV

IVNRV

NRV

BUFFERVESSEL

FORCOOLINGCIRCUIT

DRVSTRAINER DIRT

SEPERATOR

CHANGE OVER VALVES

NOTEBUFFER VESSEL SIZED TO SUIT WATER CONTENT OF COOLING CIRCUIT

NOTEBALANCING & IV VALVESINCLUDED IN DECOUPLINGBOTTLE KIT

DRV

BV

RAW WATER QUICK FILL VALVEFILLING LOOP TO BE REMOVEDONCE INSTALLATION IS COMPLETE

THERMOSTATICBLENDING VALVE

FLEXIBLE CONNECTIONSMUST BE USED TO AVOIDNOISE CONDUCTION

FLOW AND RETURN MODEL DEPENDANT

HEATING AND COOLING ASHP(3 PHASE OR 230V DEPENDANTON MODEL. CHECK MANUAL)

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Uni PS Buffer Tank

The Uni PS storage tank has been designed to provide a simple buffer for installations where large volumes of thermal energy are being produced via renewable sources such as CHP or Biomass.

• Perfectly suited to systems that incorporate CHP or Biomass.

• Instantaneous fresh hot water is provided without the possibility of legionella when used with hot water production coils.

• Extremely low thermal losses due to 120mm thick complete insulation made from CFC- free foam.

• Robust and hard wearing outer skin.

Model Hot water tank Dimensions mm Weight Tilting height

with insulation without insulationLtr. height Ø height Ø kg mm

Uni PS 350 350 1550 800 1450 600 120 1575Uni PS 450 450 1870 800 1770 600 131 1875Uni PS 600 600 1850 900 1750 700 165 1890Uni PS 750 750 1830 990 1730 790 190 1910Uni PS 900 900 2150 990 2050 790 215 2205Uni PS 1000 1000 2280 990 2180 790 250 2320Uni PS 1250 1250 2050 1200 1950 1000 320 2200Uni PS 1500 1500 2330 1200 2230 1000 360 2450Uni PS 1750 1750 2080 1400 1980 1200 425 2335Uni PS 2000 2000 2350 1400 2250 1200 445 2555Uni PS 2500 2500 2350 1500 2250 1300 500 2610Uni PS 3000 3000 2350 1600 2250 1400 550 2665

BIOMASSBOILER(WOOD)

SUPPLIED ASCOROLLA SMART KIT

GASBOILER

NO 1

GASBOILER

NO 2

GASBOILER

NO 3

GASBOILER

NO 4

NRV

IV

IV

IV

IV

NRV

NRV

VERTICALDIRT

SEPERATOR

VERTICALDIRT

SEPERATOR

VERTICALDIRT

SEPERATOR

VERTICALAIR

SEPERATOR

1500 LTRBUFFERVESSEL

PRESSOSMART

FLOW PIPEWORK

RETURN PIPEWORK

NOTES

EXPANSIONTANK /

PRESSURISATIONUNIT

IV

IV

IV

IV

NRV

NRV

Buffer Tank Typical System Schematic

9

Thermal Store Range Chart

Model Description

S-PD 350 350 L Solar StoreS-PD 450 450 L Solar StoreS-PD 600 600 L Solar StoreS-PD 750 750 L Solar StoreS-PD 900 900 L Solar StoreS-PD 1000 1000 L Solar StoreS-PD 1250 1250 L Solar StoreS-PD 1500 1500 L Solar StoreS-PD 1750 1750 L Solar StoreS-PD 2000 2000 L Solar StoreS-PD 2500 2500 L Solar StoreS-PD 3000 3000 L Solar Store

Model

S-WP-PD 750 750 L Heat Pump StoreS-WP-PD 900 900 L Heat Pump StoreS-WP-PD 1250 1250 L Heat Pump StoreS-WP-PD 1500 1500 L Heat Pump Store

Model

Uni PS 350 350 L Uni PS StoreUni PS 450 450 L Uni PS StoreUni PS 600 600 L Uni PS StoreUni PS 750 750 L Uni PS StoreUni PS 900 900 L Uni PS StoreUni PS 1000 1000 L Uni PS StoreUni PS 1250 1250 L Uni PS StoreUni PS 1500 1500 L Uni PS StoreUni PS 1750 1750 L Uni PS StoreUni PS 2000 2000 L Uni PS StoreUni PS 2500 2500 L Uni PS StoreUni PS 3000 3000 L Uni PS StoreStandard Heat ExchangerPart Number of Coils CharacteristicsWT 30 Cu Without Circulation (10 l/min), 3/4” Connection for hot water generationWT 40 Cu Without Circulation (15 l/min), 3/4” Connection for hot water generationWT 50 Cu Without Circulation (20 l/min), 3/4” Connection for hot water generationSpecific Heat ExchangerPart Number of Coils CharacteristicsWT 36 Cu Without Circulation 3.5 m2 Heating Surface, 1” Connection use as pre heaterWT 30 Cu (Cooling Exchanger) 2.5 m2 Heating Surface, 22mm (ext dia.) To reclaim heat from chillerWT 30 CuNi (Without Circulation for Pool) 2.5 m2 Heating Surface, 3/4” Connection for pool heatingWT 2.3 Solar 2.3 m2 Heating Surface, 3/4” Connection 1.4L water capacityWT 3.2 Solar 3.2 m2 Heating Surface, 3/4” Connection, 1.9L water capacity (from 750L store)WT 4.1 Solar 4.1 m2 Heating Surface, 3/4” Connection, 2.5L water capacity (from 1250L store)

Note: Others tank sizes are available upon request please contact the Evinox Technical department on 01372 722277 for details.

Case Study

Evacuated tube solar energy from Evinox provides the rhino enclosure at Whipsnade Zoo with hot water for the rhino showers, the rhino pool and the enclosure Air Handling Unit. The 1500 litre thermal store allows solar heat to combine with an Air Source Heat Pump to top up any energy requirements in the winter, keeping both water and ambient temperatures at optimum levels to encourage breeding.

The unique design of the high performance evacuated tube collectors ensures that the solar thermal system can make a contribution to heat demand all year round and not just in times of peak sunshine. The Evinox solar system, designed with northern European climates in mind, is well known for generating heat transfer in cold, windy or humid conditions, with minimal heat loss. At the request of the head keeper at Whipsnade Zoo,

the control system provided by Evinox ensures that the hot water for the rhino showers, the temperature of the rhino pool and the air temperature of the enclosure are at the optimum levels to encourage the rhinos to breed.

The solar controller provided by Evinox allows for integrating the heating technologies and will bring the heat pump on only when the store sensors realise that there is not enough energy being produced by the solar thermal system to meet the temperature requirements of the system.

Even during winter commissioning the exceptional performance of the evacuated tube system lifted the temperature of the store up to 60°C. The combination of the solar collectors and the thermal store allows the early morning sun’s energy to be quickly harnessed in the upper part of the store by transferring heat, via the heat transfer tube, to above the solar baffle in the lower part of the store.

When Evinox researched the best use of solar technology, they identified that the key ingredient was harnessing the energy when available and storing it in large thermal stores ready for times of demand, ensuring that solar energy is not wasted when available due to the inability to store it. The Thermal Store solution provided by Evinox, was awarded ‘Industrial/Commercial Product of the Year’ in the prestigious H&V News Awards in 2008, due to the unique way it optimises solar performance, and can generate 15% more energy when compared with other methods of storage.

Whipsnade Zoo has a project board in the viewing enclosure showing visitors how the heating and hot water system works, and publicising their own commitment to using renewable technology. This is the first of other planned projects around the Zoo that Evinox will be working on.

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Evinox Limited. Blenheim House. 1 Blenheim Road. Epsom. Surrey. KT19 9AP.

T: +44 (0) 1372 722277 E: info@evinox.co.uk technical@evinox.co.uk www.evinox.co.uk

Evinox reserves the right to make changes and improvements which may necessitate alteration to the specification without prior notice. This is not a contractual document.

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Integrated heating intelligence