Abstract
In this work, novel composite silicone-SAPO-34 foams have been prepared and experimentally characterized for application in desiccant open cycles. Water adsorption isotherms of several samples have been measured by a gravimetric dynamic vapour sorption analyser at 30°C and 70°C up to the relative humidity RH= 75%, representing typical process and regeneration air conditions in desiccant evaporative cooling cycles. Adsorbent foams manufactured with 20%, 40% and 60% weight fraction of SAPO-34 have been compared with the pure SAPO-34 powder. Results highlighted that the prepared foams adsorb a significant amount of water, according to the initial mass fraction of zeolite used in the compound. Moreover, the tested foams exhibited sufficiently fast water sorption rate for practical application in a desiccant open cycle system.
Highlights
Desiccant evaporative cooling cycles can significantly contribute to develop Heating, Ventilating and Air Conditioning (HVAC) systems characterized by high energy efficiency and low environmental impact [1, 2]
Adsorbent foams manufactured with 20%, 40% and 60% weight fraction of SAPO-34 have been compared with the pure SAPO-34 powder
Being the zeolite a compound typically used in open cycle desiccant wheels [5], in this work several samples of silicone-SAPO-34 composite foams have been prepared and morphological and water adsorption properties have been investigated
Summary
Desiccant evaporative cooling cycles can significantly contribute to develop Heating, Ventilating and Air Conditioning (HVAC) systems characterized by high energy efficiency and low environmental impact [1, 2]. Due to their intrinsic high surface area per unit mass, could allow to obtain a large amount of zeolite coating per unit of volume, and at the same time the foam porosity could act as a preferential pathways for the vapour diffusion. This approach allows improving the amount of active material embedded into the adsorbent heat exchanger. Being the zeolite a compound typically used in open cycle desiccant wheels [5], in this work several samples of silicone-SAPO-34 composite foams have been prepared and morphological and water adsorption properties have been investigated. Adsorption isotherms transient water uptake have been measured by a gravimetric adsorption apparatus in typical operating conditions of such systems
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