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Resorption heat pump development.

Number: 0147

Author(s) : ATKINSON G. H., CRITOPH R. E., METCALF S. J., SHIRE G. S. F.

Summary

The development of a resorption heat pump for domestic use is described. The cycle uses the alternate adsorption and desorption of ammonia between two salts – sodium bromide and manganese chloride. The equilibrium and dynamic behaviour of both salts with ammonia has been measured using the Large Temperature Jump (LTJ) technique and a good match found between experimental and modelled data. This has been used to design a nominal 2.5 kW heat pump as a demonstrator to confirm the results. The bench scale machine can be driven by a high temperature source of pressurised water at up to 170 °C, the low temperature input is from water between 5 and 15 °C and the output is between 40 and 60 °C. It uses a simple cycle consisting of one low-pressure phase followed by a high-pressure phase, without any heat recovery, moving ammonia from the Low Temperature Salt (LTS) sodium bromide reactor to the High Temperature Salt (HTS) manganese chloride reactor and vice versa. A practical machine would have two such sets of reactors and recover heat between them, but this level of complexity is avoided in the demonstrator. Despite this, initial results are extremely encouraging having achieved repeatable ammonia cycling between the reactors.

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Pages: 6 p.

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Details

  • Original title: Resorption heat pump development.
  • Record ID : 30031095
  • Languages: English
  • Subject: Technology
  • Source: 14th IEA Heat Pump Conference 2023, Chicago, Illinois.
  • Publication date: 2023/05/15

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