7
FOR THE USER
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 antifreeze, glycol. The antifreeze mixture collects the heat from the rock and with the
help of the heat transfer fl uid it is led into the evaporator. The temperature is then approximately 0ºC.
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 zero degree heat transfer fl uid it starts to boil.
It then forms a vapour, which is led into the compressor. The temperature of the vapour is 0ºC.
The pressure of the refrigerant increases in the compressor and the vapour temperature rises from 0ºC to
approximately +100ºC. The warm gas is then forced into the condenser.
The condenser transfers the heat to the house’s heating system (radiators and fl oor heating) and the hot
water system. The vapour is cooled in the condenser and becomes fl uid. The pressure in the refrigerant is still
high when it is led on to 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.
There is also a valve for regulating refrigerant fl ow.
The heat transfer fl uid is led out from the heat pump to the rock to collect new stored solar energy. The heat
transfer fl uid is led out from the heat pump to the rock to collect new stored solar energy. The temperature of
the fl uid is approximately -3ºC.
1
2
3
4
5
6
Floor heating
Radiator
Fan-assisted
radiator
Heat pump
Rock
Soil
0ºC
-3ºC
0ºC +100ºC
-10ºC
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6
2 3 4
5
Circulation pump
Heat transfer fl uid
pump
This is how your heat pump works
“The hot side”
“The cold side”
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