The principle of the refrigeration cycle is shown in Fig. 27.17. Where the refrigerant passes through the following four phases:
1 evaporation (with heat absorption)
2 compression (with energy absorption)
3 condensation (with heat emission)
In a refrigeration system, a second condenser can be incorporated in the cycle and the recovered heat used for:
1 heating domestic water,
2 supply air heating,
3 reheating in the case of supply air dehumidification.
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