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CSA EXP07:  ongoing progress, lessons learned, and future work in load-based testing of residential heat pumps.

Number: 2477

Author(s) : HARLEY B., ALATORRE M., DYMOND C., HAMER G.

Summary

The use of load-based testing for heat pumps and air conditioners is gaining global interest as stakeholders look for better ways to measure the complex performance of modern, variable-speed systems. This paper presents test results and experience gained using CSA EXP07:19, a load-based test and rating procedure for residential air-source heat pumps and air conditioners. EXP07 is an innovative lab test that uses simulated loads in contrast to existing test procedures that depend on proprietary, fixed test modes and static room conditions, such as AHRI 210/240. During the test, a heat pump’s performance is measured as it responds to the simulated load according to its built-in control algorithms attempting to maintain indoor room temperature under loads that are scaled with outdoor conditions. This test methodology reveals complex equipment behavior that is often built into product firmware but not revealed in conventional lab test procedures, uncovering substantial performance variability and substantial differences in relative ranking of products.
The lab tests, mapped to a range of climates from Hot-Dry to Subarctic, inform heating and cooling efficiency metrics that may prove valuable to consumers, utility programs, and design professionals; detailed test results can be used to improve design practices, facilitate performance-based modeling and enhanced code compliance. Test results may also help manufacturers improve their products’ performance and comfort. Lab results to date have established the merits of the procedure and suggest the value of stakeholder adoption of EXP07 as the procedure matures, with the goal of improving state and utility program design, home energy ratings, performance-based code compliance and other voluntary activities that support energy efficiency and carbon reduction.
EXP07:19 load-based and climate-specific testing and rating procedure for heat pumps and air conditioners has been updated based on extensive technical comments received from industry stakeholders and feedback from labs with experience implementing the procedure, and a new edition will be published in 2022. This paper summarizes the results of testing to date, discusses lessons learned and improvements that are being incorporated into the updated edition, and outline future directions for further development and validation of the procedure.

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Details

  • Original title: CSA EXP07:  ongoing progress, lessons learned, and future work in load-based testing of residential heat pumps.
  • Record ID : 30030745
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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