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Coupled component- and system-level simulation of a diffusion absorption refrigeration system for residential applications.

Author(s) : RATTNER A. S., GARIMELLA S.

Summary

Diffusion absorption refrigeration (DAR) is a fully thermally driven cycle with promising applications in waste heat recovery and medicinal cooling in developing countries. In this study, idealized and detailed thermodynamic models of the DAR cycle are developed. The idealized model is employed to study the performance of a representative DAR refrigerator over ranges of ambient temperature, conditioned space temperature, and auxiliary gas flow rate. System performance is found to rapidly decline as the conditioned space temperature is reduced. Additionally, system performance is found to be sensitive to auxiliary gas circulation rate, especially at low conditioned space temperatures. The detailed system model includes momentum balances that couple device geometry, heat transfer rates, and component state points to determine solution, refrigerant, and auxiliary gas flow rates. This model is employed to simulate the performance of two devices with dimensions and cooling duties: a) comparable to; and b) one-half the size of commercially available residential refrigerators. Both devices are predicted to achieve COPs of approximately 0.17 with generator temperatures of 136 and 131ºC, respectively.

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Pages: 185-195

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Details

  • Original title: Coupled component- and system-level simulation of a diffusion absorption refrigeration system for residential applications.
  • Record ID : 30001191
  • Languages: English
  • Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
  • Publication date: 2011/04/06

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