Smaller compression ratio makes the motor in an inefficient, light-load operating state

For a compressor that uses a low-pressure refrigerant to cool the motor, such as a reciprocating piston compressor, a decrease in the density of the refrigerant passing over the surface of the motor winding causes a decrease in the heat capacity per unit volume of the refrigerant, thereby reducing the ability to cool the motor. As the refrigerant mass flow rate decreases, more and more refrigerant will stagnate in certain parts of the system, such as the accumulator, part of the lubricating oil will also stagnate with the refrigerant, and the compressor oil storage will decrease. After a certain level, the deterioration of the lubrication condition of the moving parts will have a series of adverse consequences, the seriousness of which is not only the efficiency drop and the increase of the noise, but also the abnormal wear of the moving parts and endangering the operational reliability of the compressor.

If the system is not designed properly, the lubricating oil return performance of the circulation system is not good. When the refrigerant mass flow rate is significantly reduced, the lubricating oil will even stagnate in the heat exchanger and the pipeline, which affects the lubrication effect and the refrigerant flow resistance. It will increase greatly, and it is clear that the thermal efficiency of the system will be drastically reduced. The compression ratios of various types of compressors are limited. The difference in the ability of different types of compressors to adapt to changes in compression ratios sometimes plays an important role in the operating range of the heat pump. Undoubtedly, medium-temperature compressors or compressors for refrigeration can meet the requirements of reliable operation under large compression ratio operating conditions, but this will inevitably face long-term operation under small compression ratio operating conditions in the summer. The compression ratio puts the motor in an inefficient, light-load operating state.

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