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Maintenance Knowledge

Heat pump principle


In the summer air-conditioning cooling, run by cooling conditions, high-pressure steam from the compressor discharge, through the reversing valve (also called the four valve) into the condenser; when heating in winter, the first valve steering pump working position, and from the compressor discharge pressure of refrigerant steam into the indoor evaporator through the reversing valve (for condenser with the release of latent heat), refrigerant vapor condensation, the indoor air heating, achieve indoor heating, liquid refrigerant condensation, from reverse flowing through the throttle device into the condenser (as for evaporator), absorb external heat and evaporation, the steam evaporation after the valve after the compressor suction, complete the heating cycle. In this way, the outside air (or water) in the heat pump in high temperature indoor, so called "heat pump".

In the heat pump cycle, the heat has Q0kcal/h from low temperature heat source (outdoor air or water circulation, the temperature were higher than the evaporation temperature t0), the consumption of the mechanical work ALkcal/h, and to high temperature heat source (indoor heating system) supplies the Q1kcal/h heat, the relationship between the heat is consistent with the first law of thermodynamics, which Q1=Q0+ALkcal/h