The heat pump hot water system is mainly composed of compressor, evaporator, condenser, throttling device, thermal insulation water tank, etc.
Compressor: The compressor is the heart of the heat pump water heater, and its function and working principle are the same as those of the compressor of the steam compression refrigeration device. However, because the heat pump compressor is used all the year round, the working time is long, the working environment temperature, humidity and dust conditions change greatly, the condensation temperature is high, the winter political and legal temperature is low, the working temperature difference between the cold and hot ends of the heat pump is large, and the operating conditions are bad, Therefore, the heat pump water heater has higher requirements for the compressor.
Evaporator: A device that directly absorbs heat from the air. All evaporators of heat pump water heaters system adopt tube fin structure (i.e. copper tube aluminum fin type). The temperature of the refrigerant sprayed from the throttling device is very low (lower than normal temperature). When passing through the evaporator, the refrigerant absorbs the heat in the air through copper tubes and fins. With the absorbed heat, the refrigerant enters the compressor for the next cycle.
Condenser: condenses the high-temperature and high-pressure refrigerant vapor discharged from the compressor into liquid refrigerant through heat dissipation. The heat absorbed by the refrigerant from the evaporator is absorbed by the medium (atmosphere) around the condenser. It is mainly divided into three categories: volumetric condensers that directly heat all volumes of water; Circulating heating condenser for circulating heating of all water; The temperature of water is heated to the set temperature at one time, and then delivered to the direct heated condenser of the insulation water tank (equipped with a constant temperature outlet valve).
Throttling device: throttling device plays a very important role in the heat exchange process. When the heat exchange medium with normal temperature and high pressure flows through the throttle valve, it will become the medium with low temperature and low pressure, so that it can exchange heat to the external environment; The throttling device also plays an important role in regulating the refrigerant flow and establishing the high and low pressure difference of the system; The throttling device also has the function of controlling the overheating of the refrigerant at the outlet of the evaporator and controlling the liquid level of the evaporator, so that the heat exchange area of the evaporator can be fully utilized and the suction belt can be prevented from damaging the compressor. The structure of throttling device can be extremely simple, such as capillary; It can also be relatively complex, such as thermal expansion valve, electronic expansion valve and expander.
Heat pump hot water tank: Like the electric water heater, when the heat pump cannot meet the requirements of instant on and instant heating, the heat storage insulated water tank must be used to store the prefabricated hot water. Therefore, the role of the water tank for heat pump is to store hot water. After connecting the water pipe, fill it with water first. After starting the engine, the Freon refrigerant condenses and releases heat through the water tank, transferring the heat to feed water, and the water is gradually heated.
Post time: Jan-04-2023