Promising methods of ice control of air heat pump evaporators

Abstract Heat pumps are used as alternative equipment in the arrangement of hot water treatment and heating of buildings and premises. The principle of the device and functioning of heat pumps, the processes that take place during the removal of low-potential heat are described. The features of the operation of air heat pumps at subzero temperatures are disclosed. The reasons for the low transformation coefficient of air heat pumps at negative outdoor temperature are considered. This paper describes the main existing methods for ice control of heat exchangers of air heat pumps: the method of the reverse of the refrigerant, bypass method, method of ice control with non-freezing solutions, accumulative method, method of thawing using the electrical warming up evaporator, defrosting with the help of the air flow, their advantages and disadvantages in the process at low temperatures. A promising method for removing ice from heat exchangers using mechanical vibrations is presented. The operating parameters of air heat pumps with different thawing methods are given. It examines their effectiveness when the air temperature is -25°C, a comparison of energy consumption for ice control of the outdoor unit of heat exchanger of air heat pump, presents photos of the process of removing ice from the air evaporator of heat exchanger.