Study on a re-heat two-stage adsorption chiller - The influence of thermal capacitance ratio, overall thermal conductance ratio and adsorbent mass on system performance

M. Z.I. Khan, K. C.A. Alam, Bidyut Baran Saha, A. Akisawa, T. Kashiwagi

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Silica gel/water based adsorption cycles have a distinct advantage in their ability to be driven by heat of near-ambient temperature so that waste heat below 100 °C can be recovered. One interesting feature of refrigeration cycles driven by waste heat is that they do not use primary energy as driving source. From this context, some researchers investigated the performance of multi-stage adsorption refrigeration cycles those can be operated by heat source of temperature 60 °C or lower which are usually purged to the environment, with a heat sink of temperature at 30 °C. However, the performances of multi-stage systems are low. To improve system performance, an analytic investigation on a re-heat two-stage chiller is performed to clarify the effect of thermal capacitance ratio of the adsorbent and inert material of sorption element, overall thermal conductance ratio of sorption element and evaporator along with silica gel mass on the chiller performance. Results show that cycle performance is strongly influenced by the sorption elements overall thermal conductance values due to their severe sensible heating and cooling requirements resulting from batched cycle operation. The effect of thermal capacitance ratio (Cs/Cm) becomes significant with relatively higher mass of silica gel. It is also found that the chiller performance increases significantly in the range of silica gel mass from 4 to 20 kg.

Original languageEnglish
Pages (from-to)1677-1685
Number of pages9
JournalApplied Thermal Engineering
Volume27
Issue number10
DOIs
Publication statusPublished - Jul 1 2007

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Adsorbents
Capacitance
Adsorption
Silica gel
Sorption
Waste heat
Refrigeration
Heat sinks
Evaporators
Hot Temperature
Temperature
Cooling
Heating
Water

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

Cite this

Study on a re-heat two-stage adsorption chiller - The influence of thermal capacitance ratio, overall thermal conductance ratio and adsorbent mass on system performance. / Khan, M. Z.I.; Alam, K. C.A.; Saha, Bidyut Baran; Akisawa, A.; Kashiwagi, T.

In: Applied Thermal Engineering, Vol. 27, No. 10, 01.07.2007, p. 1677-1685.

Research output: Contribution to journalArticle

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