Working Principle of Heat Pump

Heat pump dryer is a kind of equipment which transfers heat energy from low temperature heat source to high temperature heat source. The low-temperature heat source usually used for heat pump installation is the medium around us - air, River water, or the discharge of auxiliary working fluids from industrial consumption equipment. These working fluids often have similar temperatures with the surrounding media. The working principle of heat pump dryer is different from that of compact refrigeratory. In small air conditioner, in order to fully exert its efficiency, cooling in summer or heating in winter is accomplished by using the same set of equipment. When heating in winter, the evaporator and condenser in the air heater are exchanged by a reversing valve. In summer, when the air conditioner is cooled, the high-pressure steam discharged by the compressor is operated according to the refrigeration condition. It enters the condenser through the reversing valve (also known as the four-way valve). The refrigerant vapor is condensed into the liquid, installed into the evaporator through throttling, and absorbed heat in the evaporator to cool the indoor air. However, the vaporized refrigerant vapor is inhaled by the compressor after the reversing valve, so that the cycle can be reciprocated to complete the refrigeration cycle. When heating in winter, the reversing valve is first turned to the working position of the heat pump, so the high-pressure refrigerant vapor discharged from the compressor flows into the evaporator (for condenser) after the reversing valve. The latent heat released during the condensation of refrigerant vapor heats the indoor air and reaches the purpose of indoor heating. The liquid refrigerant after condensation is installed into the condenser (for evaporator) through the reverse flow throttle. It absorbs external heat and evaporates. The evaporated steam is inhaled by the compressor after passing through the reversing valve to complete the heating cycle. In this way, the heat in the outside air (or circulating water) is "pumped" into the room with higher temperature, so it is called "heat pump". The working cycle of

heat pump is just the opposite of that of heat engine. Heat engine uses the energy of high-temperature heat source to produce dynamic mechanical work, while heat pump uses mechanical work to transfer the heat of low-temperature heat source to high-temperature object.

Heat pump consumes a part of its energy when it works. It excavates the energy stored in the environment medium, and stops using temperature through the heat transfer working fluid circulation system. The whole heat pump installation consumes only a small part of the output power. Therefore, the use of heat pump technology can save a lot of high-grade energy. In operation, the evaporator absorbs heat from the surrounding environment to evaporate the working fluid for heat transfer. The temperature and pressure of the working fluid vapor increase after being compressed by the compressor. When the high temperature vapor passes through the condenser to condense into liquid, the heat released is transferred to the water in the water storage tank. After condensation, the heat transfer refrigerant is returned to the evaporator through the shrinkage valve, and then evaporated, thus circulating and reciprocating.