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6 720 642 344 (2010/01)
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Fig. 1 Greensource with HWDU-151 – function description
1Internal unit
2Underfloor heating system
3Radiators
4Heating circuit pump
5Heat transfer medium pump
6Heat pump
7Expansion valve
8Evaporator
9Compressor
10 Condenser
The fan blows air through the evaporator.
The air meets the refrigerant in the evaporator. At this
point, the refrigerant is in liquid form. The refrigerant
begins to boil as soon as it meets the warmer air. The
resulting vapour is routed into the compressor.
The pressure of the refrigerant increases in the
compressor and the temperature of the gas rises to
approx. +100 °C. The warm gas is then forced into the
condenser.
Energy in the condenser is transferred to the heat
transfer fluid circuit. The gas is cooled down and
becomes fluid. The pressure in the refrigerant is still
high when it is routed to the expansion valve.
Inside the heat pump, the energy is routed to the
heating system (underfloor heating system and/or
radiators) and via the DHW cylinder into the DHW
system of the building.
The refrigerant pressure is reduced by the expansion
valve, from where the refrigerant is routed to the
evaporator. The refrigerant changes back into its
gaseous form whilst it runs through the evaporator.
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