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Automated hot-cycle calorimeter for household refrigerating compressors with surrounding air and refrigerant inlet temperatures at 16 and 32°C.

Number: 2542

Author(s) : SILVEIRA A. S., VIEIRA J. S., MELO T. A., SENGER G. A., HERMES C. J. L.

Summary

This paper introduces a fully automated calorimeter for testing refrigerating compressors for household applications at surrounding air temperatures of 16°C and 32°C in compliance with the newest IEC 62552 (2020) standard requirements. The rig automation included four key steps: test box and suction line temperature control, working pressures control, test run automation, and report generation. For box temperature control, an auxiliary refrigeration system with electric heaters, regulated by a PI controller, was employed to maintain the temperature references at 16°C or 32°C. A novel heat exchanger arrangement was adopted to promote suction line temperature control complying with the compressor surrounding air condition. Evaporating and condensing pressures control was achieved using two proportional electric valves with gain-scheduled PI controllers, providing a fast response to reference changes, while maintaining stability. Also, an algorithm for test automation was devised to identify steady-state condition, to change the point of operation, and to follow a pre-determined test sequence. Upon test completion, an automated report is generated, including not only of the compressor datasheet, but also the coefficients of a semi-empirical model. The calorimeter automation resulted in up to 90% reduction in total test runtime when compared to a fully manual facility.

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Details

  • Original title: Automated hot-cycle calorimeter for household refrigerating compressors with surrounding air and refrigerant inlet temperatures at 16 and 32°C.
  • Record ID : 30033033
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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