What temperature is a heat pump not effective?

    

    The air source heat pump is an energy-saving product that can meet users' demands for heating, cooling and hot water. So at what degree can the air source heat pump not operate?
        

        

The minimum operating temperature of the air source heat pump is minus 30 degrees. The heating energy efficiency at low temperature (-25°C) is 50%-80% higher than that of the conventional air source heat pump unit. When the ambient temperature drops significantly, the heating capacity attenuation is small, which is fully guaranteed Heating effect. Why can't it run below minus 30 degrees? There are several situations:


1. The inspiratory specific volume increases. When the unit runs in a low temperature environment, the evaporation temperature of the system decreases, and the suction specific volume of the compressor increases, but the theoretical gas delivery volume of the compressor is unchanged, so the volume flow of refrigerant entering the compressor decreases, and the corresponding unit The heat produced by the refrigerant is reduced, the coefficient of heating performance of the system is reduced, and the economy is reduced.

2. Exhaust temperature is too high. When the ambient temperature drops below 0℃ or even lower, the evaporation temperature is too low. In order to produce higher temperature hot water, the compressor high and low pressure ratio difference will continue to increase, which will inevitably cause the exhaust temperature to be too high, even exceeding the compressor The permissible operating temperature range causes the compressor to start and stop frequently, the system cannot work normally, and the compressor will be burned in severe cases.

3. The problem of oil return and liquid return. In a low temperature environment, when the evaporation temperature is too low, the compressor compression ratio will increase and the exhaust temperature will rise rapidly, which will cause the lubricating oil viscosity to drop sharply, which will affect the compressor lubrication. It will cause problems such as damage to the compressor.



 


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