Two-stage non-regenerative silica gel-water adsorption refrigeration cycle

B. B. Saha*, K. C.A. Alam, A. Akisawa, T. Kashiwagi, K. C. Ng, H. T. Chua

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Over the past two decades there have been considerable efforts to use adsorption (solid/vapor) for cooling and heat pump applications, but intensified efforts were initiated only since the imposition of international restrictions on the production and use of CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons). Closed-type, conventional adsorption refrigeration and heat pump systems have an increasing market share in Japan. In this paper, a two-stage non-regenerative, silica gel-water adsorption chiller design is outlined. Experimental measurements are performed on a prototype of a 3.5 kW rated cooling capacity adsorption heat pump in order to determine its performance under different operating temperatures (hot, cooling and chilled water). The chiller performance is analyzed in terms of cooling capacity and coefficient of performance (COP). The main innovative feature in the two-stage adsorption chiller is the ability to utilize low-temperature waste heat (∼55°C) as the driving source with a cooling source of 30°C. The technological difficulty inherent in operating a thermally activated cycle with such a small regenerating temperature lift (temperature difference between heat source and heat sink inlets) is overcome by use of a two-stage cycle.

Original languageEnglish (US)
Pages (from-to)65-69
Number of pages5
JournalAmerican Society of Mechanical Engineers, Advanced Energy Systems Division (Publication) AES
StatePublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Mechanical Engineering
  • Energy Engineering and Power Technology


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