Title of article :
Solar cooling with aluminium pillared clays
Author/Authors :
Vardoulakis، نويسنده , , E. and Karamanis، نويسنده , , D. N. Assimakopoulos، نويسنده , , M.N. and Mihalakakou، نويسنده , , G.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
8
From page :
2363
To page :
2370
Abstract :
Aluminium modified clays were prepared, characterised and tested for their potential application as solar coolers of roof surfaces. The water adsorption isotherm of the samples with restored cation exchange capacity was of hydrophilic type II, indicating multilayer adsorption with large heat of adsorption and pore condensation of water vapour at the pressures of the proposed application. In addition, high moisture adsorption capacity (more than 0.1 g of moisture per g of material at 60–70% of relative humidity) and fast kinetics for night sorption (comparable to silica gel) were determined for the freeze-dried pillared sample. In cyclic experiments with low irradiation during the day and night relative humidity of 55%, the maximum temperature inside the pillared montmorillonite was 6.5 °C lower than the corresponding temperature inside a typical soil sample. The primary mechanism for the reduced temperature elevation at aluminium modified clays was evaporative cooling and desorption with minor influence of solar reflection. These results indicate the suitability of aluminium pillared clays for lowering the roof surface temperatures.
Keywords :
Pillared clay , urban heat island , Energy Savings , Passive cooling , Evaporative cooling , Cool roof
Journal title :
Solar Energy Materials and Solar Cells
Serial Year :
2011
Journal title :
Solar Energy Materials and Solar Cells
Record number :
1486066
Link To Document :
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