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Mechanical Ventilation Heat Recovery Modelling for AccuRate Home—A Benchmark Tool for Whole House Energy Rating in Australia

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  • Jinfei Sun

    (Energy Division, Commonwealth Scientific and Industrial Research Organisation, Melbourne, VIC 3168, Australia
    Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Qingdao University of Technology, Qingdao 266520, China
    Shandong Key Laboratory of Waste Heat Utilization and Energy Saving Equipment Technology, Qingdao University of Technology, Qingdao 266520, China
    College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China)

  • Zhengen Ren

    (Energy Division, Commonwealth Scientific and Industrial Research Organisation, Melbourne, VIC 3168, Australia)

  • Jianxiang Guo

    (Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Qingdao University of Technology, Qingdao 266520, China
    Shandong Key Laboratory of Waste Heat Utilization and Energy Saving Equipment Technology, Qingdao University of Technology, Qingdao 266520, China
    College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China)

Abstract

To manage energy-efficient indoor air quality, mechanical ventilation with a heat recovery system provides an effective measure to remove extra moisture and air contaminants, especially in bathrooms. Previous studies reveal that heat recovery technology can reduce energy consumption, and its calculation needs detailed information on the thermal performance of exhaust air. However, there are few studies on the thermal performance of bathroom exhaust air during and after showers. This study proposed a detailed thermal performance prediction model for bathroom exhaust air based on the coupled heat and mass transfer theory. The proposed model was implemented into the AccuRate Home engine to estimate the thermal performance of residential buildings with heat recovery systems. The time variation of the water film temperature and thickness on the bathroom floor can be estimated by the proposed model, which is helpful in determining whether the water has completely evaporated. Simulation results show that changing the airflow rate in the bathroom has little effect on drying the wet floor without additional heating. The additional air heater installed in the bathroom can improve floor water evaporation efficiency by 24.7% under an airflow rate of 507.6 m 3 /h. It also demonstrates that heat recovery can significantly decrease the building energy demand with the fresh air load increasing and contribute about 0.6 stars improvement for the houses in Hobart (heating-dominated region). It may be reduced by around 3.3 MJ/(m 2 ·year) for the houses in other regions. With this study, guidelines for optimizing the control strategy of the dehumidification process are put forward.

Suggested Citation

  • Jinfei Sun & Zhengen Ren & Jianxiang Guo, 2023. "Mechanical Ventilation Heat Recovery Modelling for AccuRate Home—A Benchmark Tool for Whole House Energy Rating in Australia," Energies, MDPI, vol. 16(19), pages 1-22, September.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:19:p:6801-:d:1247045
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    References listed on IDEAS

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    1. Zhang, L.Z., 2006. "Energy performance of independent air dehumidification systems with energy recovery measures," Energy, Elsevier, vol. 31(8), pages 1228-1242.
    2. Bojic, M. & Trnobransky, K., 1995. "Influence of hot tool parameters on heat recovery in a space-heating and ventilation system," Energy, Elsevier, vol. 20(10), pages 1075-1079.
    3. Lei Tang & Zhengtao Ai & Chunyan Song & Guoqiang Zhang & Zhengxuan Liu, 2021. "A Strategy to Maximally Utilize Outdoor Air for Indoor Thermal Environment," Energies, MDPI, vol. 14(13), pages 1-13, July.
    4. Tom Marsik & Riley Bickford & Conor Dennehy & Robbin Garber-Slaght & Jeremy Kasper, 2021. "Impact of Intake and Exhaust Ducts on the Recovery Efficiency of Heat Recovery Ventilation Systems," Energies, MDPI, vol. 14(2), pages 1-10, January.
    5. Bai, H.Y. & Liu, P. & Justo Alonso, M. & Mathisen, H.M., 2022. "A review of heat recovery technologies and their frost control for residential building ventilation in cold climate regions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 162(C).
    6. Qi Xu & Saffa Riffat & Shihao Zhang, 2019. "Review of Heat Recovery Technologies for Building Applications," Energies, MDPI, vol. 12(7), pages 1-22, April.
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    Cited by:

    1. Slawomir Rabczak & Krzysztof Nowak, 2024. "Evaluating the Efficiency of Surface-Based Air Heating Systems," Energies, MDPI, vol. 17(5), pages 1-15, March.

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