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Gas leakages measurement method on hermetic reciprocating compressor.

Number: 1126

Author(s) : KERPICCI H., SAHIN C., BACAK A.

Summary

Due to the changing energy regulations of domestic refrigerators, the performance of hermetic reciprocating compressors becomes very crucial. Therefore, the number of refrigerators on which the variable capacity compressors are used, increase considerably in the last decade. Previous investigations show that there is still higher potential on thermodynamic efficiency to increase the compressor’s coefficient of performance (COP). Gas leakages are also an important parameter affecting the capacity so the COP of the compressor. Variation of the gas leakages with respect to the operating conditions needs to be investigated to optimize the piston-cylinder bearing design and improve the volumetric efficiency of the compressor.
In this study, a gas leakage measurement setup was established. The compressor to be tested is modified with a fully direct suction connection. All possible leakages between the suction line and the compressor shell are avoided. Due to the modified connection of the pipes, the risk of oil suction into the cylinder was too high. To avoid this risk an oil separator is placed in the suction line before the compressor. In this way, however, after running for a certain period the oil level in the compressor will decrease. The oil accumulator, therefore, was constructed from glass to be able to observe the oil quantity accumulated.
The service connection of the compressor shell is connected to a large vessel and that vessel is again connected to the suction line of the compressor via a valve. The total system is placed on a compressor calorimeter to simulate the ASHRAE test conditions. After starting the compressor and waiting until all parameters have stabilized (suction pressure, condensation pressure, compressor shell temp., and vessel temperature), the valve between the vessel and the suction line is closed. The suction pressure is kept constant by the calorimeter, but due to piston leakage, the pressure in the compressor shell and the vessel starts to rise. By measuring this pressure increase in time the piston leakage can be calculated. Measurements were conducted at different rotational speeds and various operating conditions.

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  • Original title: Gas leakages measurement method on hermetic reciprocating compressor.
  • Record ID : 30030264
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15

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