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Data from Laboratory Tests of a Prototype Carbon Dioxide Ground-Source Air Conditioner

These data from the laboratory tests of a prototype residential liquid-to-air ground-source air conditioner (GSAC) using CO2 as the refrigerant. The data collection and processing methods are described in detail in this report:

Report Title: "Laboratory Tests of a Prototype Carbon Dioxide Ground-Source Air Conditioner", NIST Technical Note 2068
Publication Date: October 2019
DOI: https://doi.org/10.6028/NIST.TN.2068
Authors: Harrison Skye, Wei Wu

The tests were performed in an environmental chamber and followed the ISO 13256-1 standard for rating GSHPs. The CO2 GSAC operated either in a subcritical or a transcritical cycle, depending on the entering liquid temperature (ELT). The test results included the coefficient of performance (COP), capacity, sensible heat ratio (SHR), and pressures. The system incorporated a liquid-line/suction-line heat exchanger (LLSL-HX), which was estimated to cause a COP penalty of (0 to 2) % for ELTs ranging (10 to 25) °C, and benefit of (0 to 5) % for ELTs ranging (30 to 39) °C. With ELTs ranging (10 to 39) °C the CO2 system cooling COP ranged (7.3 to 2.4). At the standard rating condition (ELT 25 °C), the CO2 GSAC cooling COP was 4.14, and at part-load conditions (ELT 20 °C) the system had a COP of 4.92.

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Updated: 2024-02-22
Metadata Last Updated: 2019-10-11
Date Created: N/A
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Air conditioner
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Title Data from Laboratory Tests of a Prototype Carbon Dioxide Ground-Source Air Conditioner
Description These data from the laboratory tests of a prototype residential liquid-to-air ground-source air conditioner (GSAC) using CO2 as the refrigerant. The data collection and processing methods are described in detail in this report: Report Title: "Laboratory Tests of a Prototype Carbon Dioxide Ground-Source Air Conditioner", NIST Technical Note 2068 Publication Date: October 2019 DOI: https://doi.org/10.6028/NIST.TN.2068 Authors: Harrison Skye, Wei Wu The tests were performed in an environmental chamber and followed the ISO 13256-1 standard for rating GSHPs. The CO2 GSAC operated either in a subcritical or a transcritical cycle, depending on the entering liquid temperature (ELT). The test results included the coefficient of performance (COP), capacity, sensible heat ratio (SHR), and pressures. The system incorporated a liquid-line/suction-line heat exchanger (LLSL-HX), which was estimated to cause a COP penalty of (0 to 2) % for ELTs ranging (10 to 25) °C, and benefit of (0 to 5) % for ELTs ranging (30 to 39) °C. With ELTs ranging (10 to 39) °C the CO2 system cooling COP ranged (7.3 to 2.4). At the standard rating condition (ELT 25 °C), the CO2 GSAC cooling COP was 4.14, and at part-load conditions (ELT 20 °C) the system had a COP of 4.92.
Modified N/A
Publisher Name National Institute of Standards and Technology
Contact mailto:harrison.skye@nist.gov
Keywords Air conditioner , carbon dioxide , CO2 , ground-source heat pump , subcritical and transcritical cycles
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