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 article

21 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

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Silica Gel
Silica gel
Refrigeration
Heat exchangers
Capacitance
gel
silica
Cooling
cooling
adsorption
Adsorption
Water
Evaporators
Desorption
desorption
heating
Heating
water
air conditioning
Waste heat

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering

Cite this

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

In: ASHRAE Transactions, Vol. 103, No. 1, 01.01.1997, p. 139-148.

Research output: Contribution to journalConference article

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