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Worcester Greenstore System Manual

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Heat transfer fl uid in. The heat pump collects stored solar energy. It contains a heat transfer fl uid which is
a solution of water and glycol. This antifreeze mixture collects the heat from the earth and is fed into the
evaporator. The temperature is on average around 3-5ºC.
In the evaporator, the heat transfer fl uid meets the refrigerant. At this stage, the refrigerant is in a fl uid state
and is at approximately -10ºC. When the refrigerant meets the heat transfer fl uid it starts to boil. It then forms
a vapour, which is fed into the compressor. The temperature of the vapour is around 0ºC.
The pressure of the refrigerant increases in the compressor and the vapour temperature rises from 0ºC to
approximately +125ºC. The hot gas is then forced into the condenser.
The condenser transfers the heat to the heating system (underfl oor heating or perhaps radiators) and the hot
water system. The vapour is cooled in the condenser and becomes liquid. The pressure in the refrigerant is
still high when it reaches the expansion valve.
The refrigerant pressure is lowered in the expansion valve. At the same time, the temperature also drops to
approximately -10ºC. When the refrigerant passes the valve and the evaporator it changes to vapour again.
The expansion valve also regulates the amount of refrigerant fed into the evaporator.
The heat transfer fl uid is led out from the heat pump to the ground loop to collect new stored solar energy.
The temperature of the fl uid is approximately 3ºC cooler than the fl ow in.
1
2
3
4
5
6
Underfl oor heating
Radiator
Fan-assisted
radiator
Heat pump
Rock
Soil
0ºC
-3ºC
0ºC +100ºC
-10ºC
1
6
2 3 4
5Heat carrier pump
Heat transfer fl uid
pump
How the heat pump works
The heating circuit
The collector circuit
… 6 …


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