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    Investigation of activated carbon/ethanol for low temperature adsorption cooling

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    Authors
    Elsayed, Ahmed
    Al-Dadah, Raya
    Mahmoud, Saad
    Kaialy, Waseem
    Issue Date
    2018-03-01
    
    Metadata
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    Abstract
    Commercially available adsorption cooling systems use water/silica gel, water/zeolite and ammonia/ chloride salts working pairs. The water based pairs are limited to work above 0 °C due to the water high freezing temperature, while ammonia has the disadvantage of being toxic. Ethanol is a promising refrigerant due to its low freezing point (161 K), non-toxicity, zero ozone depletion and low global warming potential. Activated carbon (AC) is a porous material with high degree of porosity (500-3000 m2/g) that has been used in wide range of applications. Using Dynamic Vapour Sorption (DVS) test facility, this work characterizes the ethanol adsorption of eleven commercially available activated carbon materials for cooling at low temperature of - 15oC. DVS adsorption results show that Maxsorb has the best performance in terms of ethanol uptake and adsorption kinetics compared to the other tested materials. The Maxsorb/ethanol adsorption process has been numerically modeled using computational fluid dynamics (CFD) and simulation results are validated using the DVS experimental measurements. The validated CFD simulation of the adsorption process is used to predict the effects of adsorbent layer thickness and packing density on cycle uptake for evaporating temperature of -15oC. Simulation results show that as the thickness of the Maxsorb adsorbent layer increases, its uptake decreases. As for the packing density, the amount of ethanol adsorbed per plate increases with the packing density reaching maximum at 750 kg/m3. This work shows the potential of using Maxsorb/ethanol in producing low temperature cooling down to -15oC with specific cooling energy reaching 400kJ/kg.
    Publisher
    Taylor & Francis Online
    Journal
    International Journal of Green Energy
    URI
    http://hdl.handle.net/2436/621682
    DOI
    10.1080/15435075.2014.937867
    Additional Links
    https://www.tandfonline.com/doi/full/10.1080/15435075.2014.937867
    Type
    Journal article
    Language
    en
    ISSN
    1543-5075
    1543-5083
    ae974a485f413a2113503eed53cd6c53
    10.1080/15435075.2014.937867
    Scopus Count
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    Faculty of Science and Engineering

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