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Estimations of energy density and storage efficiency for cascading adsorption heat storage concepts.

Number: AD-SY-1095

Author(s) : TREIER M. S., MUNZ G., HENNINGER S. K., et al.

Summary

Energy density and storage efficiency are two key figures of merit for any heat storage. For closed-cycle adsorption based systems, these two quantities have to be defined carefully for each use case, since both the desorption (storage charging) and the adsorption phase (storage discharging) involve a heat transformation step with an additional heat source or sink [1,2]. Assumptions on these strongly influence achievable energy densities and efficiencies, and the minimal usable temperature lift assumed for the discharge phase should always be reported when assessing performance. In heating applications for buildings, a typical required temperature lift between ambient heat source and heat sink is about 30 K. Considering this requirement and the adsorption properties of different adsorbents, there are several options to realize advanced cascading adsorption cycles with the aim of increasing the energy density and/or storage efficiency. Two such options, a high-temperature cascade (realizing a double effect cycle) and a low-temperature cascade (realizing a double lift cycle) are discussed here.

Details

  • Original title: Estimations of energy density and storage efficiency for cascading adsorption heat storage concepts.
  • Record ID : 30022952
  • Languages: English
  • Source: International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.
  • Publication date: 2017/08/07

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