Abstract
The adsorption cooling systems have been developed to replace vapor compression due to their benefits of being environmentally friendly and energy saving. We prepared zeolite-4A and experimental cooling performance test of zeolite-water adsorption system. The adsorption cooling test-rig includes adsorber, evaporator, and condenser which perform in vacuum atmosphere. The maximum and minimum water adsorption capacity of different zeolites and COP were used to assess the performance of the adsorption cooling system. We found that loading zeolite-4A with higher levels of silver and copper increased COP. The Cu6%/zeolite-4A had the highest COP at 0.56 while COP of zeolite-4A alone was 0.38. Calculating the acceleration rate of zeolite-4A when adding 6% of copper would accelerate the COP at 46%.
Highlights
Cooling systems play important roles in our daily life like food preservation, air-conditioning system, and medical treatment
This damages the ozone level in Earth’s atmosphere, due to emission of HFCs, HCFCs, and CFCs commonly used in vapor compression systems, and use of these refrigerants is perceived as a critical contributor to global warming [1]
When examining microstructure attributes of clay using Scanning Electron Microscope (SEM), we found crystalline structures arranged in layers; see Figure 4(a)
Summary
Cooling systems play important roles in our daily life like food preservation, air-conditioning system, and medical treatment. The working substance cannot reach the inner regions of adsorbent and leads to slower adsorption rate This directly leads to low Coefficient of Performance (COP). Chan et al reported that a 13X/CaCl2 composite adsorbent for adsorption cooling systems with an ideal COP for a 13X/CaCl2-water pair is 0.78 compared to 0.54 for zeolite-13X-water pair [4]. Pons and Guilleminot tried to use zeolite composites to replace zeolite as an adsorbent and two different composites: Advances in Materials Science and Engineering (i) 65% zeolite + 35% metallic foam and (ii) 70% zeolite + 30% natural expanded graphite. The latter combination performed better [7]. Our present work investigated experimentally the adsorption capacity of water on zeolite-4A from Thai clay with silver and copper loading to determine the COP for adsorption and desorption processes
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