Several major differences between air source heat pump and heating and cooling air conditioning

What is the difference between an air source heat pump and a heating and cooling air conditioner? Why is air energy heat pump heating gradually becoming the mainstream clean heating mode? The following air-conditioning maintenance company will tell you:

1. Differences in working principle

Air source heat pump: The electric power drives the compressor to compress the low-temperature refrigerant into high-temperature refrigerant. The high-temperature refrigerant exchanges heat with water through the hot water heat exchanger. After the heat exchange, the high-temperature refrigerant is depressurized by the expansion valve and absorbed in the air by the evaporator. The refrigerant after absorbing heat is sucked in by the compressor, continuously absorbing heat from the air, and dissipating heat on the side of the hot water heat exchanger to heat the cold water. The heat absorbed by the water is the sum of the heat produced by the compressor and the heat absorbed by the air by the refrigerant.

Air-conditioning: The electric-driven compressor works to compress the low-temperature refrigerant into high-temperature refrigerant. The high-temperature refrigerant is dissipated by the evaporator. The air-conditioning mainframe fan discharges the heat to the outside. The heat-dissipated high-temperature refrigerant is decompressed by the expansion valve and absorbed by the indoor unit evaporator of the air conditioner. The heat in the air reduces the indoor temperature, and the refrigerant after absorbing the heat is sucked in by the compressor. In this way, the heat is continuously discharged from the indoor to the outdoor air, and the heat is absorbed from the indoor to achieve the purpose of reducing the indoor temperature.

2. Differences in heating methods

Air source heat pump: The air energy heat pump itself is just a device that provides hot water. It supplies heat, and then cooperates with other heating terminals to achieve heating, such as radiators, fan coils, air-energy floor heaters, floor heating pipes, etc., can be used as the heating terminals, and different heating methods can be selected according to different residences.

Air conditioner: Whether it is a wall-mounted air conditioner or a wall-mounted air conditioner, it can only use active hot air to achieve heating.

3. Differences in parts

Air source heat pump: heat pump dedicated compressor, antifreeze tank condenser, outdoor fin heat exchanger with hydrophilic membrane, system high pressure protection and control.

Air conditioner: air conditioner compressor, fin condenser or plate condenser, outdoor fin heat exchanger without hydrophilic film. Among these parts, the difference between the compressor is that the air source heat pump and the air conditioner are different because of the different compression The machine determines that the product's use effect and the use area are different. Air-conditioning compressors are selected for air-conditioning. Take R22 as an example. The maximum operating pressure does not exceed 2MPa, the compressor ratio is less than 7, and the high exhaust temperature does not exceed 90°C. However, the air source heat pump must use a heat pump compressor. Take R22 as an example. The operating pressure reaches 3MPa, the compressor ratio reaches 12 or even higher to 20, and the high exhaust temperature reaches 110°C. The difference in these parameters requires an order of magnitude improvement in the processing accuracy, bearing strength, and motor temperature resistance of the heat pump compressor compared to the air conditioner compressor.

4. Differences in heat transfer mechanism

Air source heat pump: Although the heat transfer is achieved through refrigerant, in the heat exchange stage, the heat pump uses water to exchange heat, and the air conditioner uses refrigerant as the medium from beginning to end. One is the water cycle and the other is the fluorine cycle. In the water cycle, even if the heat pump is shut down, the water flow will always stay in the indoor pipe and continuously emit temperature. This is equivalent to adding a buffer process of heat. Moreover, if a fan coil or an air-energy floor heater is used as the end, the hot air is obtained from the hot water at the end, so the overall humidity is more in line with human physiological habits and will not cause "air conditioning diseases" such as dry mouth and tongue.

Air conditioner: Air conditioner adopts "fluorine cycle" to realize heat conduction. The air-conditioning outlet discharges a large amount of hot air, and the purpose of heating is indeed achieved, but this kind of aggressive active thermal convection scheme will greatly increase the evaporation of water on the human skin surface, resulting in dry air, dry mouth and poor comfort.

5. Differences in operating mode

The operation mode of air source heat pump and air conditioner has the following differences:

1: Although the air source heat pump is energized throughout the day, when the heating is completed, the unit will stop working and automatically keep warm. Household appliances generally work no more than 2 hours a day, so air source heat pumps save electricity than air conditioners, and can better protect the compressor and extend its service life.

Two: Air conditioners are used frequently in summer, especially in northern regions, but the air source heat pump integrates hot water, heating, and cooling, and runs longer in winter. Especially in winter, the demand for hot water is large, so the air source heat pump needs a longer time to run to raise the water temperature, and the compressor needs more time to run, so the compressor basically runs in the area with higher refrigerant. . Shanghai Decoration Design believes that the operating temperature is one of the main factors affecting the life of the compressor. Under the same operating time, the overall load on the compressor in the air source heat pump is higher than that of the compressor in the air conditioner.