General Description - Bosch DOMESTIC HOT WATER HEAT PUMP Technical Manual

1.1 General description

This model of domestic hot water heat pump provides hot water for residential purposes, using a closed refrigerant
unit filled with a refrigerant gas (R134a). This ensures the energy production taking out the energy from a cold
source - air, and delivering this energy to a secondary circuit – water - where a simple circulation pump, ensures
water movement through a heat exchanger, heating the water stored in a tank.
The engine absorbs energy "Qc" from a cold source (heat absorbed from air) and expels energy "Qh" to a hot
destination (heat delivered to water) while Work "W" is done in the refrigerator circuit (electrical supply). The work
done is ensured by an electrical plug that supplies electricity to the compressor and the movement of the refrigerant
gas R134a ensures the transport of the energy from "Qc" to "Qh".
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(a)
Pict.1 (a) Refrigeration Unit and (b) Storage Tank (with coil)
Condens
Expansion
Valve
Evaporato
Pict.2 – Heat Pump close circuit representation
6720649497 SM HP270-1 2012/09 en
(b)
Heat sink
(Qh)
er
Flow
direction
Compressor
r
Heat source
(Qc)
(W)