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Monitoring the heating energy performance of a heat wheel in a direct expansion air handling unit.

Author(s) : KASSAI M., AL-HYARI L.

Type of article: IJR article

Summary

This study presents an on-site examination of the heating energy performance of a real ventilation system, running on the flat roof of a shopping complex building in Hungary. The main focus of this study is to delve into the heating energy efficiency of specific air handling elements, such as the air-to-air rotary heat wheel and the direct expansion heating coil supplied by a variable refrigerant volume outdoor unit under real operation conditions. Additionally, an investigation was carried out during the heating season to scrutinize the potential occurrence of CO2 transfer from the exhaust airflow to the supply airflow within the heat wheel, which issue highlights a notable limitation of the heat recovery system. Based on the monitored and measured data, the energy saving impact of the heat wheel was 20.5 % on the electric power consumption of the variable refrigerant volume outdoor unit throughout the entire heating period, compared to operation without heat wheel. Furthermore, the relative average of CO2 cross-contamination is recorded as 3.8 % in the investigated heating season.

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Pages: 115-123

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Details

  • Original title: Monitoring the heating energy performance of a heat wheel in a direct expansion air handling unit.
  • Record ID : 30033212
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 169
  • Publication date: 2025/01
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2024.10.035

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