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The influence of the condensate sub cooling on the performance of a diffusion absorption refrigeration cycle.

Number: pap. n. 17

Author(s) : LEVY A., JELINEK M., BORDE I.

Summary

A Diffusion Absorption Refrigeration (DAR) cycle is driven by heat without moving parts. These systems are quiet and reliable and often used in hotel rooms and offices. The disadvantage of these systems is a very low COP. Therefore the influence of the condensate sub cooling on the performances of a DAR cycle is of great importance. While the COP is defined as the heat absorbed by the evaporator divided by the heat supply to the generator, the increase of the COP can be achieved either by increasing the amount of heat absorbed by the evaporator or by decreasing the heat supply to the generator. In this work the influence of the condensate sub cooling on the performances of a DAR cycle was studied. The performances of three DAR systems, which differ in their condensate sub cooling configuration, were studied numerically. In the first configuration the condensate flows directly to the evaporator inlet without sub cooling (nSC), in the second configuration the condensate is sub cooled by the refrigerant heat exchanger (pSC) before the evaporator inlet and in the third configuration the condensate is sub cooled both by the refrigerant heat exchanger and the evaporator (fSC) before the evaporator inlet. The last configuration is commonly used by commercial systems. It was found that for the same heat input the second configuration shows the highest cooling effect at the evaporator and therefore the highest COP.

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Pages: 10 p.

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Details

  • Original title: The influence of the condensate sub cooling on the performance of a diffusion absorption refrigeration cycle.
  • Record ID : 30013326
  • Languages: English
  • Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Publication date: 2014/03/02

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