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Computational analysis of an advanced adsorption-refrigeration cycle

Author

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  • Saha, Bidyut B.
  • Boelman, Elisa C.
  • Kashiwagi, Takao

Abstract

We have investigated analytically the performance of the thermally driven, advanced three-stage adsorption chiller utilizing low-grade waste heat of 50°C and lower temperatures as the driving heat source, in combination with a heat sink (cooling water) of 30°C. The closed cycle chiller for use in air-conditioning utilizes the silica-gel-water adsorption system. A cycle-simulation program was constructed to analyze the influence of operating conditions (temperatures, flow rates and adsorption-desorption cycle times) on cooling output, COP and chiller efficiency (η = COP/Carnot COP). The main advantage of this chiller is that it is operational with smaller regenerating temperature lifts (ΔTregen = heat source-heat sink temperature) than other heat-driven chillers. By cycle simulation, it was shown that the three-stage chiller can be operated with heat sources of 50 and 40°C in combination with cooling sources of 39 and 30°C, respectively. The simulation results also show that for the chiller to operate effectively, heat sources of 50°C require cooling sources between 35 and 20°C (ΔTregen = 15 to about 30K), while heat sources of 40°C need cooling sources in the range of 28-20°C (ΔTregen = 12 to about 20 K).

Suggested Citation

  • Saha, Bidyut B. & Boelman, Elisa C. & Kashiwagi, Takao, 1995. "Computational analysis of an advanced adsorption-refrigeration cycle," Energy, Elsevier, vol. 20(10), pages 983-994.
    • Handle: RePEc:eee:energy:v:20:y:1995:i:10:p:983-994
    DOI: 10.1016/0360-5442(95)00047-K
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