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Evaporator flooding upon compressor start-up as a function of heat exchanger geometry and refrigerant.

Number: 2355

Author(s) : PRANATHARTHI HARAN S., BRENDEL L. P. M., LIU H., BRAUN J. E., GROLL E. A.

Summary

The dangers of liquid flooding in compressors are well known, yet the conditions during startup that can lead to refrigerant exiting an evaporator and thus entering a compressor are poorly understood. This research investigates how different refrigerants and heat exchanger geometries affect the severity of flooding during transients associated with compressor start up. R134a, R1234ze(E), R245fa, and R404A were tested in three heat exchangers with internal volumes of 0.12, 0.21, and 0.46 liters. A refrigerant charge threshold below which flooding never occurred was determined for each heat exchanger and each refrigerant, which increased with the size of the heat exchanger and with decreasing viscosity. Additionally, the time from the onset till the end of flooding at the evaporator outlet was visually determined for each test run. This duration of flooding generally increased with increasing charge levels and with higher kinematic viscosity and surface tension when comparing refrigerants in the same evaporator. At high charge levels, any one refrigerant showed the flooding time for a given charge regardless of the heat exchanger geometry.

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Pages: 10 p.

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  • Original title: Evaporator flooding upon compressor start-up as a function of heat exchanger geometry and refrigerant.
  • Record ID : 30030690
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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