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The design and analysis of two exhaust heat recovery systems for public shower facilities

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  • Liu, Lanbin
  • Fu, Lin
  • Zhang, Shigang

Abstract

A great deal of heat is wasted in intensive public shower facilities, such as those in schools, barracks and natatoriums, which open up at specified time. It will contribute a lot to energy saving and environmental protection with significant economic benefits to recycle the exhaust heat. In this paper, we propose two different kinds of heat pumps (an electric heat pump and an absorption heat pump) in the heat recovery systems. In both system, the used shower water is drained through a pipe and collected in a gray water pool. When the wastewater reaches certain volume, the heat pump system will begin working and recycling heat. The wastewater is filtered and piped to the heat exchanger to exchange heat with the tap water whose temperature will increase from 12°C to 25°C with the wastewater temperature dropping from 30°C to 17°C. Then the wastewater is piped to the heat pump evaporator and the tap water is piped to the condenser for farther heating. According to the different characteristics of the electric heat pump and absorption heat pump, we also introduce the processes and control methods of different heat recovery systems in details in this paper. Based on a practical example, this paper analyzes and compares the economic and environmental benefits of three retrofitting schemes, including “exhaust heat recovery using electric heat pump”, “exhaust heat recovery using electric heat pump+gas boiler” and “exhaust heat recovery using direct-fired heat pump”. Then we find out that the heat recovery system using direct-fired absorption heat pump has lower energy consumption, less pollution, lower operating cost, and shorter payback period. And it has a promising practical application.

Suggested Citation

  • Liu, Lanbin & Fu, Lin & Zhang, Shigang, 2014. "The design and analysis of two exhaust heat recovery systems for public shower facilities," Applied Energy, Elsevier, vol. 132(C), pages 267-275.
    • Handle: RePEc:eee:appene:v:132:y:2014:i:c:p:267-275
    DOI: 10.1016/j.apenergy.2014.07.013
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    References listed on IDEAS

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    1. Johansson, L. & Westerlund, L., 2001. "Energy savings in indoor swimming-pools: comparison between different heat-recovery systems," Applied Energy, Elsevier, vol. 70(4), pages 281-303, December.
    2. Liu, Lanbin & Fu, Lin & Jiang, Yi, 2010. "Application of an exhaust heat recovery system for domestic hot water," Energy, Elsevier, vol. 35(3), pages 1476-1481.
    3. Chua, K.J. & Chou, S.K. & Yang, W.M., 2010. "Advances in heat pump systems: A review," Applied Energy, Elsevier, vol. 87(12), pages 3611-3624, December.
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    1. Guo, Xiaochao & Ma, Zhixian & Ma, Liangdong & Zhang, Jili, 2019. "Experimental study on the performance of a novel in–house heat pump water heater with freezing latent heat evaporator and assisted by domestic drain water," Applied Energy, Elsevier, vol. 235(C), pages 442-450.
    2. Ramadan, Mohamad & Murr, Rabih & Khaled, Mahmoud & Olabi, Abdul Ghani, 2018. "Mixed numerical - Experimental approach to enhance the heat pump performance by drain water heat recovery," Energy, Elsevier, vol. 149(C), pages 1010-1021.
    3. Piotr Kowalski & Paweł Szałański & Wojciech Cepiński, 2021. "Waste Heat Recovery by Air-to-Water Heat Pump from Exhausted Ventilating Air for Heating of Multi-Family Residential Buildings," Energies, MDPI, vol. 14(23), pages 1-17, November.
    4. Xiang Gou & Yang Fu & Imran Ali Shah & Yamei Li & Guoyou Xu & Yue Yang & Enyu Wang & Liansheng Liu & Jinxiang Wu, 2016. "Research on a Household Dual Heat Source Heat Pump Water Heater with Preheater Based on ASPEN PLUS," Energies, MDPI, vol. 9(12), pages 1-16, December.
    5. Shen, Chao & Lei, Zhuoyu & Lv, Guoquan & Ni, Long & Deng, Shiming, 2019. "Experimental performance evaluation of a novel anti-fouling wastewater source heat pump system with a wastewater tower," Applied Energy, Elsevier, vol. 236(C), pages 690-699.
    6. Morales-Ruiz, S. & Rigola, J. & Oliet, C. & Oliva, A., 2016. "Analysis and design of a drain water heat recovery storage unit based on PCM plates," Applied Energy, Elsevier, vol. 179(C), pages 1006-1019.

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