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FOR THE USER
Heat transfer fl uid in. A hose is connected here that collects the stored solar energy from, e.g., the soil or
rock. The hose contains a heat transfer fl uid, which is a mixture of water and anti-freeze. The fl uid collects
the heat from the rock and with the help of the HTF pump leads it into the heat pump and 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
approxi100ºC. The warm gas is then forced into the condenser.
The condenser is the heat pump’s heat emitting part. Here the heat is transferred 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 has passed through the valve and the evaporator it changes to
vapour again.
In heat transfer fl uid out, 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.
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2
3
4
5
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Floor heating
Radiator
Fan-assisted
radiator
Heat pump
Rock
Soil
0ºC
-3ºC
0ºC
+100ºC
-10ºC
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6
2
3
4
5
Heat carrier
pump
Heat
transfer pump
This is how your heat pump works
“The hot side”
“The cold side”
