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, B. B. Saha, A. Akisawa, T. Kashiwagi

    Research output: Contribution to journalArticlepeer-review

    41 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 2007

    All Science Journal Classification (ASJC) codes

    • Energy Engineering and Power Technology
    • Industrial and Manufacturing Engineering

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