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A numerical study on influences of building envelope heat gain on operating performances of a bed-based task/ambient air conditioning (TAC) system in energy saving and thermal comfort

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  • Mao, Ning
  • Pan, Dongmei
  • Li, Zhao
  • Xu, Yingjie
  • Song, Mengjie
  • Deng, Shiming

Abstract

There has been an increasing concern on thermal comfort in sleeping environments and its associated energy use in the past few years. To improve the thermal environment and to reduce energy use of air conditioning in bedrooms, applications of task/ambient air conditioning (TAC) systems were proposed and studied previously. It’s indicated that the TAC system can be well integrated with a bed. Due to the variation of the envelope heat gain in a bedroom during night, it is necessary to study the thermal environment inside a bedroom and the energy use of a TAC system for the bedroom at varying envelope thermal loads. Therefore, this paper reports on a numerical study on a TAC system applied to a bedroom with different envelope heat gains. The influences of envelope heat gain on energy consumption of the TAC system and the indoor thermal comfort were studied in this paper. The research results show that at supply air flow rate (Qs) of 50 l/s, energy consumption was increased from 47.78W to 213.11W, and the PMV value was increased from −1.69 to −1.29 with the increase in envelope heat gain from 3.11W to 155.6W. To make PMV equal to zero under different envelope heat gains, linear regression models between supply air parameters and PMV were built and solved. The obtained values form curves where PMV=0 and give a guide for operation of the TAC system. It was found that the calculation of energy consumption on these curves depends only on envelope heat gain.

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  • Mao, Ning & Pan, Dongmei & Li, Zhao & Xu, Yingjie & Song, Mengjie & Deng, Shiming, 2017. "A numerical study on influences of building envelope heat gain on operating performances of a bed-based task/ambient air conditioning (TAC) system in energy saving and thermal comfort," Applied Energy, Elsevier, vol. 192(C), pages 213-221.
  • Handle: RePEc:eee:appene:v:192:y:2017:i:c:p:213-221
    DOI: 10.1016/j.apenergy.2017.02.027
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    References listed on IDEAS

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    8. Mao, Ning & Hao, Jingyu & He, Tianbiao & Song, Mengjie & Xu, Yingjie & Deng, Shiming, 2019. "PMV-based dynamic optimization of energy consumption for a residential task/ambient air conditioning system in different climate zones," Renewable Energy, Elsevier, vol. 142(C), pages 41-54.
    9. Fahid Riaz & Muhammad Abdul Qyyum & Awais Bokhari & Jiří Jaromír Klemeš & Muhammad Usman & Muhammad Asim & Muhammad Rizwan Awan & Muhammad Imran & Moonyong Lee, 2021. "Design and Energy Analysis of a Solar Desiccant Evaporative Cooling System with Built-In Daily Energy Storage," Energies, MDPI, vol. 14(9), pages 1-17, April.
    10. Hwang, Ruey-Lung & Shih, Wen-Mei & Huang, Kuo-Tsang, 2020. "Performance-rating-based approach to formulate a new envelope index for commercial buildings in perspective of energy efficiency and thermal comfort," Applied Energy, Elsevier, vol. 264(C).
    11. Song, Mengjie & Xu, Xiangguo & Mao, Ning & Deng, Shiming & Xu, Yingjie, 2017. "Energy transfer procession in an air source heat pump unit during defrosting," Applied Energy, Elsevier, vol. 204(C), pages 679-689.
    12. Fabrizio Ascione & Nicola Bianco & Rosa Francesca De Masi & Margherita Mastellone & Giuseppe Peter Vanoli, 2019. "Phase Change Materials for Reducing Cooling Energy Demand and Improving Indoor Comfort: A Step-by-Step Retrofit of a Mediterranean Educational Building," Energies, MDPI, vol. 12(19), pages 1-32, September.
    13. Cui, X. & Islam, M.R. & Chua, K.J., 2019. "Experimental study and energy saving potential analysis of a hybrid air treatment cooling system in tropical climates," Energy, Elsevier, vol. 172(C), pages 1016-1026.
    14. Jiying Liu & Shengwei Zhu & Moon Keun Kim & Jelena Srebric, 2019. "A Review of CFD Analysis Methods for Personalized Ventilation (PV) in Indoor Built Environments," Sustainability, MDPI, vol. 11(15), pages 1-33, August.
    15. Zhang, Sheng & Cheng, Yong & Fang, Zhaosong & Huan, Chao & Lin, Zhang, 2017. "Optimization of room air temperature in stratum-ventilated rooms for both thermal comfort and energy saving," Applied Energy, Elsevier, vol. 204(C), pages 420-431.

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