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Disassembly of off the shelf reciprocating compressor after employment in high-temperature heat pump for more than 1000 operating hours.

Number: 1312

Author(s) : BRENDEL L. P. M., ARPAGAUS C., PFAFFL J., SIMON F., BERTSCH S. S.

Summary

High-temperature heat pumps (HTHP) will be an important technology to replace industrial heating in the temperature range from 100 to 200 °C, which is currently mainly provided by oil and gas burners. The lifetime of compressors and lubricating oil at high suction and discharge temperatures is unclear, yet crucial to understand for these applications. For this study, a reciprocating compressor was disassembled after approximately 1,000 hours of operation in a lab-scale HTHP. At least 300 hours of operation showed discharge temperatures over 120 °C and 30 hours of more than 150 °C. The cylinder head seal was damaged, colorization of the valve plate was observed, and small wear was found, possibly because of a low oil viscosity. All other parts of the compressor were unaffected, although the compressor was not specifically designed for operation at such high temperatures. Various oil measurements did not show significant deviations from the fresh oil. The study reveals that the reciprocating compressor and the oil were more resilient to the high temperatures than expected. However, more runtime is needed to gain confidence in operation in a real plant over several years.

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  • Original title: Disassembly of off the shelf reciprocating compressor after employment in high-temperature heat pump for more than 1000 operating hours.
  • Record ID : 30033598
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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