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    Performance investigation of a waste heat-driven 3-bed 2-evaporator adsorption cycle for cooling and desalination

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    Type
    Article
    Authors
    Thu, Kyaw
    SAHA, Bidyut Baran
    Chua, Kian Jon
    Ng, Kim Choon cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2016-06-13
    Online Publication Date
    2016-06-13
    Print Publication Date
    2016-10
    Permanent link to this record
    http://hdl.handle.net/10754/621801
    
    Metadata
    Show full item record
    Abstract
    Environment-friendly adsorption (AD) cycles have gained much attention in cooling industry and its applicability has been extended to desalination recently. AD cycles are operational by low-temperature heat sources such as exhaust gas from processes or renewable energy with temperatures ranging from 55 °C to 85 °C. The cycle is capable of producing two useful effects, namely cooling power and high-grade potable water, simultaneously. This article discusses a low temperature, waste heat-powered adsorption (AD) cycle that produces cooling power at two temperature-levels for both dehumidification and sensible cooling while providing high-grade potable water. The cycle exploits faster kinetics for desorption process with one adsorber bed under regeneration mode while full utilization of the uptake capacity by adsorbent material is achieved employing two-stage adsorption via low-pressure and high-pressure evaporators. Type A++ silica gel with surface area of 863.6 m2/g and pore volume of 0.446 cm3/g is employed as adsorbent material. A comprehensive numerical model for such AD cycle is developed and the performance results are presented using assorted hot water and cooling water inlet temperatures for various cycle time arrangements. The cycle is analyzed in terms of key performance indicators i.e.; the specific cooling power (SCP), the coefficient of performance (COP) for both evaporators and the overall system, the specific daily water production (SDWP) and the performance ratio (PR). Further insights into the cycle performance are scrutinized using a Dühring diagram to depict the thermodynamic states of the processes as well as the vapor uptake behavior of adsorbent. In the proposed cycle, the adsorbent materials undergo near saturation conditions due to the pressurization effect from the high pressure evaporator while faster kinetics for desorption process is exploited, subsequently providing higher system COP, notably up to 0.82 at longer cycle time while the COPs for low-pressure and high-pressure evaporators are recorded to be 0.33 and 0.51, respectively. © 2016 Elsevier Ltd.
    Citation
    Thu K, Saha BB, Chua KJ, Ng KC (2016) Performance investigation of a waste heat-driven 3-bed 2-evaporator adsorption cycle for cooling and desalination. International Journal of Heat and Mass Transfer 101: 1111–1122. Available: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.05.127.
    Sponsors
    National Research Foundation Singapore[R-265-000-466-281]
    Publisher
    Elsevier BV
    Journal
    International Journal of Heat and Mass Transfer
    DOI
    10.1016/j.ijheatmasstransfer.2016.05.127
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijheatmasstransfer.2016.05.127
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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