An efficient solar-powered adsorption chiller and its application in low-temperature grain storage |
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Authors: | HL Luo RZ Wang YJ Dai JY Wu JM Shen BB Zhang |
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Affiliation: | aInstitute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;bBranch of Jiangsu Province, Chinese State Grain Administration Company, Nanjing 210012, China;cYangzhou Grain Depot, Chinese State Grain Administration Company, Yangzhou 225009, China |
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Abstract: | A novel solar-powered adsorption cooling system for low-temperature grain storage has been built, which consists of a solar-powered water heating system, a silica gel–water adsorption chiller, a cooling tower and a fan coil unit. The adsorption chiller is composed of two identical adsorption units, each of them containing an adsorber, a condenser, and an evaporator/receiver. The two water evaporators have been incorporated into one methanol evaporator by the use of the concept of a gravity heat pipe. In order to improve the system efficiency and achieve continuous cooling production, the adsorbers are operated out-of-phase, and heat and mass recovery processes have been used. During the period from July to September of 2004, the system was put into experimental operation to cool the headspace (i.e., the air volume above the grain) of a grain bin. Three months of operation showed promising performance. The chiller had a cooling power between 66 and 90 W per m2 of collector surface, with a daily solar cooling coefficient of performance (COPsolar) ranging from 0.096 to 0.13. The electric cooling COP was between 2.6 and 3.4. |
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Keywords: | Solar-powered water heating system Adsorption refrigeration Water chiller Low-temperature storage Grain storage |
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