varvtalsreglerad fru00e5nluftsvu00e4rmepump with superkylning

摘要

The present invention relates to a method for control of a heat pump, were an evaporator 4 is arranged to a cooling circuit K of the heat pump, which is connected to a channel 17 for cooling by the evaporator of a passing fluid flow in the channel, a compressor 1 with a variable capacity adapted to increase a pressure of a circulated refrigerant in the cooling circuit, a condenser 2 which emits heat to indoor air or alternatively to tapping or circulating hot water 5, an expansion valve 3 arranged in connection to the evaporator which decreases pressure and temperature of the refrigerant before the refrigerant reaches the evaporator, that a ratio between a condenser pressure of the condenser 2 and an evaporator pressure of the evaporator 4 is continuously controlled and that the capacity of the compressor is reduced if said ratio exceeds a predetermined maximum value or if the required heat falls below the capacity of the heat pump, whereby the reduced utilization of capacity of the compressor 1 results in that the heat pump at low and moderate load operates at relatively low capacity and that the average heat factor thereby can be enhanced. The present invention also relates to a heat pump for carrying out the method.