Differences in heating methods
Air source heat pump: air energy heat pump itself is just a device to provide hot water. It supplies heat and then cooperates with other heating ends to achieve heating, such as radiators, fan coils, air energy floor heating machines, floor heating pipes, etc. can be used as its heating end, and different heating methods can be selected according to different residences.
Air conditioner: Whether it is a standing cabinet air conditioner or a wall-mounted air conditioner, it can only make use of the active hot air outlet to achieve heating.
Differences in components
Air source heat pump: special compressor for heat pump, freeze-proof high-efficiency tank condenser, outdoor finned heat exchanger with hydrophilic film, and protection controls such as system high pressure.
Air conditioner: air conditioner compressor, finned condenser or plate condenser, outdoor finned heat exchanger without hydrophilic film
In these parts, the difference between the compressor is the air source heat pump and air conditioning the biggest difference, because different compressors determine the use of the product effect and the use of different geographical areas. Air conditioners use air conditioning compressor, R22, for example, the maximum operating pressure does not exceed 2MPa, the compressor ratio is less than 7, the maximum exhaust temperature does not exceed 90 ℃; but air-source heat pumps must be used in the heat pump compressor, the same R22, for example, the maximum operating pressure up to 3MPa, the compressor ratio of up to 12, or even higher than 20, the maximum exhaust temperature up to 110 ℃. These parameters are different, requiring heat pump compressor processing accuracy, bearing strength, motor temperature resistance compared to the air conditioning compressor has orders of magnitude higher.
Heat transfer mechanism differences
Air source heat pump: Although both are through the refrigerant to achieve the transfer of heat, but in the final heat transfer stage, the heat pump is the use of water heat transfer, while the air conditioning since the beginning of the refrigerant is used as a medium. 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 stays in the pipes in the room and keeps emitting temperature. This is equivalent to adding a heat buffer process. And if you use fan coil or air heating machine as the end, hot air is the end from the hot water, so the overall humidity is more in line with human physiological habits, and will not cause dry mouth and tongue and other ‘air conditioning disease.’
Air conditioning: Air conditioners use the ‘fluorine cycle’ to conduct heat. Air conditioning vents discharged a large number of hot air, the purpose of warming is indeed achieved, but this intense active heat convection programme will greatly increase the evaporation of water on the surface of the human skin, resulting in dry air, dry mouth, poor comfort.
Difference in Operation Mode
There are the following differences in the way air source heat pumps and air conditioners operate:
First: although the air source heat pump is energised throughout the day, the unit will stop working when the heat production is complete and automatically keep warm. Household machines generally do not work more than 2 hours a day, so the air-source heat pump than air conditioning to save electricity, and can better protect the compressor, to extend its service life.
Second: air conditioners are used frequently in summer, especially in the northern region, but air source heat pumps set hot water, heating, cooling as a whole, the winter running time is longer. Especially in winter, the demand for hot water is higher, so the air source heat pump needs to run for a longer time to raise the water temperature, the compressor will need more time to run, so the compressor is basically running in the area of higher refrigerant. Operating temperature is one of the main factors affecting the life of the compressor, under the condition of running for the same period of time, the compressor in the air-source heat pump is subjected to a higher comprehensive load than the compressor in the air conditioner.
Difference in use environment
Air conditioners and air source heat pumps can be used in different ambient temperatures. Air conditioning in the heating, the maximum ambient temperature of 21 ℃, the national standard, the best use of the environment for 21 ℃ to -7 ℃. However, air-source heat pumps are different, for water heaters, spring and autumn days should also be used, according to the national standard requirements of air-source heat pumps, it is 43 ℃ to -20 ℃. Because of the use of air-source heat pump ambient temperature range is wider, so it uses the specifications of the parts selection than the air conditioning requirements are higher.
In addition, due to the use of different environments and purposes, air-source heat pumps are more demanding in terms of temperature and pressure. Air conditioning the highest air temperature is 50 ℃, then the condensing pressure is 1.8 ~ 2MPa. air-source heat pumps require 60 ℃ or even 65 ℃, then the condensing pressure reached 2.5 ~ 2.8MPa. 30% to 40% pressure difference, coupled with the low-temperature environment, especially -20 ℃, the evaporating pressure is also very low, 0.2 ~ 0.15MPa, the temperature of the water is still heated to more than 50 ℃, or 60 ℃ or even 65 ℃, or 60 ℃ or even 65 ℃. ℃, or 60 ℃ or even 65 ℃, this time the condensing pressure is still 2.7 ~ 2.8MPa, the compression ratio is much greater than 15, greater than the use of air conditioning compressor compression ratio range.