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An ammonia-water absorption refrigerator with a large temperature lift for combined heating and cooling.

Author(s) : BERLITZ T., PLANK H., ZIEGLER F., KAHN R.

Type of article: Article, IJR article

Summary

The COP of an ammonia-water absorption refrigerator can be significantly improved by incorporating a mixing column and a second absorber which is combined with a two-stage refrigerant expansion. At an internal temperature lift of 85 K (-20 to 65 deg C), these modifications result in a 50% higher COP for cooling (assuming ideal components). With real components, a 40% improvement may be achieved. The proposed cycle was realised in a laboratory test plant with a refrigeration capacity of 10 kilowatts at -20 deg C evaporator temperature. This machine was operated at a solution temperature up to 225 deg C and a condenser temperature of 65 deg C corresponding to a pressure up to 6 megapascals. COP versus temperature lift and load behaviour was tested. A COP of 0.38 was achieved at a temperture lift of 85 K. An efficient high-temperature lift cycle like that described in the paper, may find applications for deep freezing, as a topping cycle to achieve triple-effect performance, or as a device to produce simultaneous heating and cooling.

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Pages: 219-229

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Details

  • Original title: An ammonia-water absorption refrigerator with a large temperature lift for combined heating and cooling.
  • Record ID : 1998-3484
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 21 - n. 3
  • Publication date: 1998/05

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