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Effect of a thermostat environment emulator on load-based test results for a residential heat pump.

Number: 2523

Author(s) : DHILLON P., KIM D., HORTON W. T., BRAUN J. E.

Summary

A load-based testing approach has been developed recently to estimate the seasonal performance of residential air conditioners and heat pumps based on their overall dynamic performance measured in a laboratory. In this methodology, the responses of a typical residential building's sensible and latent loads to the equipment controls are emulated in a psychrometric test room by continuously updating the room temperature and humidity based on a virtual model of the building. The test unit thermostat, which is located in the indoor test room, reacts naturally to dynamic temperature variations, and equipment controls respond appropriately based on a deviation from its setpoint, comparable to a field application. The thermostat is integral to the load-based testing approach and its location in the indoor test room can lead to different sensing responses due to a variation in the temperature and airflow distribution around the thermostat. This can lead to varied test unit dynamic performance in the same and different test facilities, thus affecting the test methodology repeatability and reproducibility. To address this, a thermostat environment emulator (TEE) was developed to provide standardized environmental conditions to the thermostat to ensure realistic and reproducible conditions for the thermostat across different test facilities. In this study, the thermostat environment emulator operation and performance were assessed across varied conditions based on load-based testing of a 2-ton variable-speed heat pump with the thermostat installed in a TEE. Further, the test unit performance was also measured at the same test conditions but with the thermostat installed in the test unit return air (RA) inlet. The test unit performance was compared for two thermostat installation locations to assess the overall impact of the TEE on the test unit dynamic response and performance in load-based testing. Comparisons of seasonal performance estimates for different sets of tests are also presented.

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  • Original title: Effect of a thermostat environment emulator on load-based test results for a residential heat pump.
  • Record ID : 30030764
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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