A Study For The Potential Of Ammonia-Wood Charcoal Adsorption Refrigeration System
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Date
2012-03
Authors
Wong, Chee Khoon
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Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Adsorption systems have gained popularity over vapour compression system due to their being environmentally benign, having zero ozone depletion potential and zero global warming potential. Despite much research on the adsorption and desorption of ammonia on activated carbon, relatively few reports were found for wood charcoal. In this study wood charcoal, obtained locally, was crushed and sieved into three particle sizes for study. Particles sized 1.18 to 3.35 mm yielded the highest specific surface area which of 155.37lm2 g-1 with specific volume of 0.1309lcm3 g-1 and an average pore diameter of 2.503lnm. An innovative gravimetric method was used to characterize the adsorption of ammonia on the wood charcoal as a function of temperature, mass and time. Such method was found to be accurate and inexpensive to fabricate. For desorption study, a barometric method was employed to study the desorption of ammonia at various temperature. Adsorption of ammonia on wood charcoal yields an average of 0.081lg NH3 g-1 C adsorbed while the desorption study shows an amount desorbed only 20 to 21% of the amount adsorbed at temperatures of 162 to 202l°C. An adsorption refrigeration system was designed for a 1lkW cooling capacity. From the analysis, the system consists of 1.83lkg of wood charcoal and 93.57lg of ammonia gas with a COP of 0.40 and SCP of 0.546lkW kg-1.
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Keywords
The potential of ammonia-wood charcoal , adsorption refrigeration system