Parametric study of a silica gel-water adsorption refrigeration cycle - the influence of thermal capacitance and heat exchanger UA-values on cooling capacity, power density, and COP

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

Research output: Contribution to journalConference articlepeer-review

22 Citations (Scopus)

Abstract

The influence of heat exchanger UA-values (adsorber/desorber, evaporator, and condenser) is investigated for an adsorption chiller, with consideration given to the thermal capacitance of the adsorber/desorber by means of a lumped-parameter cycle simulation model developed by the authors and co-workers for the single-stage silica gel-water adsorption chiller. The closed-cycle-type chiller, for use in air conditioning, is driven by low-grade waste heat (85°C [185°F]) and cooled by water at 31°C (88°F) and operates on relatively short cycle times (420 seconds adsorption/desorption; 30 second adsorber/desorber sensible cooling and heating). The results showed cycle performance to be considerably affected by the thermal capacitance and UA-value of the adsorber/desorber, which is attributed to the severe sensible cooling/heating requirements resulting from batched cycle operation. The model is also sensitive to the evaporator UA-value - but to a lesser extent. The condenser UA-value is the least sensitive parameter due to the working pair adsorption behavior in the temperature range defined for desorption and condensation.

Original languageEnglish
Pages (from-to)139-148
Number of pages10
JournalASHRAE Transactions
Volume103
Issue number1
Publication statusPublished - Jan 1 1997
Externally publishedYes
EventProceedings of the 1997 ASHRAE Winter Meeting - Philadelphia, PA, USA
Duration: Jan 26 1997Jan 29 1997

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering

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