What is the Difference between Air Source Heat Pump and Air Conditioning?

In the long-term future, the coal-to-clean energy market is vast, and the potential for coal to electricity is unlimited.

So what is the difference between an air source heat pump and a cold air conditioner?

1. 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 mixes with other heating ends for heating. For example, radiators, fan coils, air-heating machines, floor heating pipes, etc. can be used as heating ends, and different heating methods can be selected according to different houses.

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

2. Differences in parts
Air source heat pump
It has heat pump special compressor, antifreeze high efficiency tank condenser, and system high voltage protection control.

Air conditioning
It has an air conditioning compressor, a fin condenser or a plate condenser, and an outdoor fin heat exchanger without a hydrophilic membrane.

Among these components, the difference between the compressors is the biggest difference between the air source heat pump and the air conditioner, because different compressors determine the use effect and the use area of the product.

The air conditioner uses an air conditioner compressor. Taking R22 as an example, the maximum operating pressure does not exceed 2 MPa, the compressor ratio is less than 7, and the maximum exhaust temperature does not exceed 90 °C;

However, the air source heat pump must use a heat pump compressor. Similarly, R22 is used. The maximum operating pressure is 3 MPa, the compressor ratio is 12 or even higher, and the maximum exhaust temperature is 110 °C. The difference in these parameters requires that the processing accuracy of the heat pump compressor, the bearing strength, and the temperature resistance of the motor have an order of magnitude improvement compared to the air conditioner compressor.

3. Differences in heat transfer mechanisms
Air source heat pump
Although the transfer of heat is achieved by the refrigerant, in the final heat exchange stage, the heat pump uses water to exchange heat. One is the water cycle and the other is the fluorine cycle. Air conditioning uses refrigerant as a medium throughout. In the water cycle, even if the heat pump is stopped, the water will always stay in the indoor pipe and continuously emit temperature. This is equivalent to a buffering process that adds a heat. And if a fan coil or an air-heating machine is used as the end, the hot air is derived from the hot water at the end. Therefore, the overall humidity is more in line with the physiological habits of the human body, and does not cause "air conditioning disease" such as dry mouth and dry mouth.

Air conditioning
The air conditioner uses a "fluorine cycle" to achieve heat transfer. A large amount of hot air is discharged from the air outlet. The purpose of warming is indeed achieved, but this intense active heat convection scheme will greatly increase the amount of water evaporation on the surface of human skin, resulting in dry air, dry mouth and poor comfort.

4. Difference in power consumption
Although the air source heat pump is energized throughout the day, the unit will stop working and automatically keep warm when the heating is completed. Therefore, the air source heat pump is more energy efficient than the air conditioner, and can better protect the compressor and extend its service life.

5. Operation mode - difference in operating temperature
air conditioning
Air conditioners are used frequently in summer, especially in the north.

Air source heat pump
However, the air source heat pump integrates hot water, heating and cooling, and has a long running time in winter. Especially in winter, the demand for hot water is large, so the air source heat pump needs to operate for a longer time to raise the water temperature, and the compressor needs more time to run. Therefore, the compressor basically runs in a region where the refrigerant is high.

Operating temperature is one of the main factors affecting the life of the compressor. Under the same time of operation, the combined load of the compressor in the air source heat pump is higher than that of the compressor in the air conditioner.

6. Differences in use environment
(1) Parts specification selection requirements
Air conditioning and air source heat pumps can be used at different ambient temperatures.

air conditioning
When the air conditioner is heating, the ambient temperature is up to 21 °C. According to the national standard, the best use environment is 21 ° C to -7 ° C.

Air source heat pump
However, air source heat pumps are different. For hot water machines, spring and autumn should also be used. According to the national standard requirements of air source heat pumps, its use range is 43 ° C to -20 ° C.

Since the air source heat pump has a wider ambient temperature range, it uses a higher specification of components than the air conditioner.

(2) Temperature and pressure requirements
Air source heat pumps are more demanding in terms of temperature and pressure due to the different environments and purposes.

air conditioning
The maximum air outlet temperature of the air conditioner is also 50 ° C, and the condensation pressure is 1.8 to 2 MPa at this time.

Air source heat pump
The air source heat pump requires 60 ° C or even 65 ° C, and the condensation pressure at this time reaches 2.5 to 2.8 MPa. The pressure difference of 30% to 40% is combined with the low temperature environment, especially -20 °C, and the evaporation pressure is very low, 0.2 to 0.15 MPa. The water temperature is still heated to over 50 ° C, or 60 ° C or even 65 ° C. At this time, the condensing pressure is still 2.7 to 2.8 MPa, and the compression ratio is much larger than 15, which is larger than the compression ratio of the air conditioner compressor.

7. Differences in system defrosting
In general, the greater the difference between the temperature of the refrigerant and the outdoor temperature, the more severe the frosting.

The air source heat pump itself relies on small temperature difference heat transfer, and the air conditioner is a large temperature difference.
The air source heat pump focuses on heating in winter and absorbs heat in a low temperature environment. The temperature in winter is minus ten or twenty degrees, while the temperature of the refrigerant is minus twenty or thirty degrees, and the temperature difference is only ten degrees;

The air conditioner focuses on cooling, and the maximum temperature in summer is 45 °C. The compressor discharge temperature reaches between 80 and 90 degrees, even 100 °C. The temperature difference is forty or fifty degrees.

Therefore, under the same circumstances, the heat exchange area of the air source heat pump is much larger than the heat exchange area of the air conditioner. This is why the air source heat pump is larger than the air conditioner.

According to the conventional control logic, the defrosting time of the air conditioner is generally about 10 minutes. The defrosting time of the air source heat pump heating unit is usually a local control logic, such as Qingdao, Shandong and Qinhuangdao in Hebei, the defrosting is more frequent than the Shanxi area. Professional air source heat pump manufacturers are generally a latitude control logic and adjusted according to local climate conditions.

Whether it is from the control logic and the area of the evaporator, or from the difference between the refrigerant and the outdoor temperature, the defrosting performance of the air source heat pump is much better than that of the air conditioner, and the possibility of frost formation is smaller. Therefore, the effective heat provided by the air source heat pump as a whole is greater than that of the air conditioner.

8. Implementation of differences in national standards
Air source heat pump
It mainly includes domestic hot water, commercial hot water, household heating, commercial heating and other standards. Taking the heating capacity and coefficient of performance as the indicators, the heating and cooling machine must also assess the cooling capacity and energy efficiency ratio.

Air conditioning
It mainly includes household air conditioners, multi-line, air-cooled chillers and other standards, with cooling capacity and energy efficiency ratio as indicators.
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