type
There are many types of heat pump water heaters on the market, mainly including solar-assisted, water-source and air-source series. Solar-assisted heat pump is a heat pump technology that combines heat pump and solar technology; water source heat pump uses water source of a certain temperature (above 20℃) as the heat source and refrigerant as the medium, absorbs the heat in the water source and compresses it through the compressor Heating uses a heat exchanger to exchange heat with cold water to achieve the purpose of heating and producing hot water. Water source heat pumps must have a water source with a certain temperature and flow rate; air source heat pumps obtain heat from the air to heat water in a similar way to water source heat pumps. Among the three types of heat pumps, air source heat pumps are subject to the least restrictions and have the greatest room for development.
Air source heat pump water heater
Air source heat pump water heaters are mainly composed of compressors, heat exchangers, axial flow fans, insulated water tanks, water pumps, liquid storage tanks, filters, electronic expansion valves and electronic automatic controllers. After the power is turned on, the axial flow fan starts to run, and the outdoor air undergoes heat exchange through the evaporator. The air with reduced temperature is discharged from the system by the fan. At the same time, the working fluid inside the evaporator absorbs heat and vaporizes and is sucked into the compressor, and the compressor takes this air. A low-pressure working fluid gas is compressed into high-temperature and high-pressure gas and sent to the condenser. The water forced to circulate by the water pump also passes through the condenser, is heated by the working fluid and sent to the user for use. The working fluid is cooled into a liquid, and the liquid expands After the valve throttles and cools down, it flows into the evaporator again. In this repeated cycle, the heat energy in the air is continuously "pumped" into the water, causing the water temperature in the insulated water tank to gradually increase, and finally reaches about 55°C, which is just suitable for people to take a bath.
Air source heat pump is one of the most advanced energy utilization products in the world today. With the rapid development of the economy and the improvement of people's living standards, domestic hot water has become a necessity for people's lives. However, traditional water heaters (electric water heaters, fuel oil water heaters, gas water heaters) have shortcomings such as high energy consumption, high cost, and serious pollution; The operation of energy-saving and environmentally friendly solar water heaters is restricted by meteorological conditions. The heating principle of the air source heat pump is completely different from that of traditional solar water heaters. The air source heat pump uses air, water, solar energy, etc. as low-temperature heat sources. The air source heat pump uses electrical energy to absorb heat from the low-temperature side to heat domestic water. The hot water circulates through The system is directly sent to users for hot water supply or uses fan coil units for small area heating. Air source heat pump is the best solution for large, medium and small hot water centralized supply systems in school dormitories, hotels, bathing centers and other places.