Overview of heat pump water heater

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Overview of heat pump water heater

as a high-efficiency energy-saving device, heat pump water heater occupies an important position in the international market. Using air (water) source heat pump water heater to produce domestic hot water can not only effectively save energy, but also "continue to increase the international influence of the plastic extruder industry" and alleviate the power shortage. Therefore, it has broad development space and application prospects in the domestic market

at present, there are many types of heat pump water heaters in the market, mainly including solar boost type, water source and air source. Solar assisted heat pump is a heat pump technology that combines heat pump and solar energy technology; The water source heat pump uses the water source with a certain temperature (above 20 ℃) as the heat source and the refrigerant as the medium to absorb the heat in the water source and compress it through the compressor for heat generation. It exchanges heat with cold water through the heat exchanger to achieve the purpose of heating and hot water production. The water source heat pump must have a water source with a certain temperature and flow; Air source heat pump heats water by obtaining heat from air in a similar way as water source heat pump. Among the three kinds of heat pumps, air source heat pump has the least restriction and the largest development space. Therefore, this paper focuses on the analysis and discussion of air source heat pump water heater

basic principle of heat pump

basic principle of heat pump water heater: it is mainly composed of compressor, heat exchanger, axial fan, insulation water tank, water pump, liquid storage tank, filter, electronic expansion valve and electronic automatic controller. After the power supply is turned on, the axial fan starts to operate. The outdoor air is heat exchanged through the evaporator. The air with reduced temperature is discharged from the system by the fan. At the same time, the working medium inside the evaporator is sucked into the compressor by heat absorption and vaporization. The compressor compresses the working medium gas which is pulled from two 3M continuous roll bags by customers with large purchase volume into high-temperature and high-pressure gas and sends it to the condenser. The water forced to circulate by the water pump also passes through the condenser, After being heated by the working medium, it is sent to the user for use, while the working medium is cooled into a liquid, which flows into the evaporator again after throttling and cooling by the expansion valve. In this way, the heat energy in the air is continuously "pumped" into the water, so that the water temperature in the insulation water tank gradually rises to about 55 ℃, which is just suitable for people to take a bath. This is the basic working principle of the air source heat pump water heater. The air source heat pump is one of the most advanced energy utilization products in the world. With the rapid development of economy and the improvement of people's living quality, domestic hot water has become a necessity for people. However, the traditional water heaters (electric water heaters, oil and gas water heaters) have the disadvantages of high energy consumption, high cost and serious pollution; The operation of energy-saving and environment-friendly solar water heaters is restricted by meteorological conditions. The heating principle of the air source heat pump is quite different from that of the traditional solar water heater. The air source heat pump uses air, water, solar energy, etc. as the low-temperature heat source. The air source heat pump uses electric energy as the power to absorb heat from the low-temperature side to heat domestic water. The hot water is directly sent to the user through the circulating system as hot water supply or the fan coil unit is used for area heating. Air source heat pump is the best solution for large, medium and small hot water centralized supply system in school dormitories, hotels, bath centers and other places

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