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Field Test and Analysis of Energy-Saving Effects of Energy-Recovery Ventilators on Heat-Pump Electricity Consumption in a Classroom

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  • Jae-Sol Choi

    (Department of Architecture, Inha University, Incheon 22212, Korea)

  • Eui-Jong Kim

    (Department of Architecture, Inha University, Incheon 22212, Korea)

Abstract

Energy-recovery ventilators (ERVs) are regarded as important energy-saving systems in buildings. It has been reported that they have high energy-saving rates compared with conventional ventilators that operate without energy recovery, but the saving rates have been obtained typically by employing chamber tests and simulations. In this work, a field-test method is proposed that uses a single test room but alternates the tested ventilation modes hourly. This proposed method is useful because an additional comparison room is not always available and can be a source of uncertainty for field tests. The test is performed in a classroom during a heating period, and the results are calibrated to account for different experimental conditions during the test period. The calibrated energy-saving rates indicate the effectiveness of the ERV; however, they are lower in the early hours of the system operation, for two reasons: (1) the maximum power control schemes of the heat pumps are applied for cases where the indoor temperatures are far lower than the set-point temperature; (2) the ventilation load seemingly represents a decreasing proportion of the total heating load in early hours owing to the thermal-capacity effects for the building, which was cooled for many hours. The findings are verified via a chamber test and simulations. As a consequence, it is important to account for actual system characteristics affected by the thermal behaviors of classrooms when the overall performance of a system is evaluated.

Suggested Citation

  • Jae-Sol Choi & Eui-Jong Kim, 2019. "Field Test and Analysis of Energy-Saving Effects of Energy-Recovery Ventilators on Heat-Pump Electricity Consumption in a Classroom," Sustainability, MDPI, vol. 11(7), pages 1-13, April.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:7:p:2069-:d:220722
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    References listed on IDEAS

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    1. Solgi, Ebrahim & Fayaz, Rima & Kari, Behrouz Mohammad, 2016. "Cooling load reduction in office buildings of hot-arid climate, combining phase change materials and night purge ventilation," Renewable Energy, Elsevier, vol. 85(C), pages 725-731.
    2. Wu, Wei & Skye, Harrison M. & Domanski, Piotr A., 2018. "Selecting HVAC systems to achieve comfortable and cost-effective residential net-zero energy buildings," Applied Energy, Elsevier, vol. 212(C), pages 577-591.
    3. Liu, Di & Zhao, Fu-Yun & Tang, Guang-Fa, 2010. "Active low-grade energy recovery potential for building energy conservation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(9), pages 2736-2747, December.
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