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Advances in Novel Working Fluids for Absorption Heat Pump

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Absorption Heating Technologies

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Abstract

The working fluids are very important for absorption cycles. They can not only affect the heating/cooling efficiency, but also determine the operating temperature range, cycle configuration, cost-effectiveness, safety, environmental-friendliness and so on. The most widely used working fluids are H2O/LiBr and NH3/H2O. H2O/LiBr has high efficiency but suffers from crystallization and disability to operate under sub-zero evaporation temperatures. NH3/H2O are suitable for low evaporation temperatures, but it usually requires rectification to increase the purity of the refrigerant. In addition, the NH3-based working fluids may not be used in some applications due to the safety concern. To address this problem, the HFC-based working fluids are alternative options. However, some HFCs need to be phased out due to their high global warming potential (GWP). Therefore, the low-GWP HFC-based and HFO-based working fluids are proposed. Advances in different novel working fluids are summarized, aiming for various objectives, including increasing efficiency, avoiding crystallization, avoiding rectification, increasing safety, as well as increasing sustainability. Noted that the introduced studies are mainly for absorption heating, with some also for absorption cooling, which can also be referenced for heating applications.

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Authors and Affiliations

  1. School of Energy and Environment, City University of Hong Kong, Hong Kong, China

    Wei Wu

  2. Department of Building Science, Tsinghua University, Beijing, China

    Xianting Li

  3. Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China

    Tian You

Authors
  1. Wei Wu
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  2. Xianting Li
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  3. Tian You
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Correspondence to Wei Wu .

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Wu, W., Li, X., You, T. (2020). Advances in Novel Working Fluids for Absorption Heat Pump. In: Absorption Heating Technologies. Springer, Singapore. https://doi.org/10.1007/978-981-15-0470-9_7

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  • DOI: https://doi.org/10.1007/978-981-15-0470-9_7

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-15-0469-3

  • Online ISBN: 978-981-15-0470-9

  • eBook Packages: EnergyEnergy (R0)

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