6
1.2.3. Cooling circuit
As depicted in Figure 1 and 2, the heat pump cycle can be divided in four main pro-
cesses: compression (1-2), condensation (2-3), expansion (3-4), evaporation (4-1)
described below.
• At the suction of the compressor (1) the superheated gas refrigerant enters the
compressor at low pressure.
• In the compressor, the gas is compressed to a higher pressure and temperature
level (2).
• The gas is first de-superheated and condensed in the condenser, exchanging heat
with water stored in the tank.
• The refrigerant exits the condenser in a subcooled, liquid form (3)
• Through a thermostatic expansion valve the pressure of the refrigerant is lowered
to allow its evaporation at lower temperatures (4).
• The refrigerant is evaporated in the fin-coil heat exchanger that uses forced air as
heat source (1).
• The process goes on until the power supply to the compressor is stopped.
A deeper description of the cooling circuit and all components used for its design can
be found in Figure 3, 4 and 5.
3
2
1
4
Figure 1 – Heat pump principle Figure 2 – Pressure-Enthalpy diagram
Summary of Contents for VANVEX R +
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