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Causes of overheating of the compressor exhaust

Author:HU Date:2019/3/15 19:37:50
 We all know that the compressor is the heart of the air conditioner. The compressor is related to the service life of the air conditioner. If the exhaust temperature is overheated, there are mainly the following reasons: high return air temperature, large motor heating capacity, high compression ratio, high condensing pressure, and refrigeration. The agent was not chosen properly.
(1) high return air temperature
The return air temperature is relative to the evaporation temperature. In order to prevent backflow, the return air line generally requires a return air superheat of 20 °C. If the return line is not well insulated, the degree of superheat will far exceed 20 °C.
The higher the return air temperature, the higher the cylinder suction and exhaust temperatures. For every 1 °C increase in the return air temperature, the exhaust gas temperature will increase by 1 to 1.3 °C.
(2) Motor heating
For a return air-cooled compressor, the refrigerant vapor is heated by the motor as it flows through the motor cavity, and the cylinder suction temperature is again increased. The heat generated by the motor is affected by power and efficiency, and the power consumption is closely related to displacement, volumetric efficiency, working conditions, and frictional resistance.
In the return air-cooled half-sealed compressor, the temperature rise of the refrigerant in the motor cavity is approximately between 15 and 45 °C. In the air-cooled (air-cooled) type compressor, the cooling system does not pass through the winding, so there is no motor heating problem.

(3) The compression ratio is too high
The exhaust gas temperature is greatly affected by the compression ratio, and the larger the compression ratio, the higher the exhaust gas temperature. Reducing the compression ratio can significantly reduce the exhaust temperature, including increasing the suction pressure and reducing the exhaust pressure.
The suction pressure is determined by the evaporation pressure and the suction line resistance. Increasing the evaporation temperature can effectively increase the suction pressure and rapidly reduce the compression ratio, thereby reducing the exhaust gas temperature.
Some users believe that the lower the evaporation temperature, the faster the cooling rate. This idea has many problems. Although lowering the evaporation temperature can increase the freezing temperature difference, the refrigeration capacity of the compressor is reduced, so the freezing speed is not necessarily fast. Moreover, the lower the evaporation temperature, the lower the refrigeration coefficient, the higher the load, the longer the running time, and the higher the power consumption.

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