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Theoretical analysis of a new two-stage absorption-transcritical hybrid refrigeration system.

Number: pap. ID14

Author(s) : JIANG Y. Y., GAO N., HE Y. J., et al.

Summary

Until now, a lot of low grade heat with temperatures of 40 ~ 55°C, such as the condensing heat of a compression refrigeration system, hasn’t been utilized to achieve cooling of 7°C. The classical two-stage absorption refrigeration system is usually used to utilize heat sources as low as 55 ~ 65°C. The absorption-compression refrigeration techniques show good potential. They still meet great difficulty in making use of 40 ~ 55°C heat. Besides, it has been proved that transcritical cycles can work well under very wide operation temperatures. As a result, a transcritical subsystem is used to combine a two-stage absorption refrigeration one in this hybrid refrigeration system. R744 is chosen for the transcritical subsystem and the LiBr-H2O pair for the absorption subsystem. Based on the models of this new system, theoretical study is carried out on its performance. The main effects are discussed on the COPnet (the ratio of low grade heat powered refrigeration capacity to the generator heat consumption, which cut off that mechanical work powered) in this context. Results show that the proposed system can recycle the 40 ~ 55°C condensing heat and COPnet can be improved by 2.5 ~ 55 % in utilizing 45 ~ 55°C low grade heat, compared with the classical two-stage absorption refrigeration system.

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Pages: 8 p.

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Details

  • Original title: Theoretical analysis of a new two-stage absorption-transcritical hybrid refrigeration system.
  • Record ID : 30012171
  • Languages: English
  • Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
  • Publication date: 2014/08/02

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