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| dc.contributor.author | Ayele, Lijalem | |
| dc.date.accessioned | 2020-03-17T10:43:17Z | |
| dc.date.available | 2020-03-17T10:43:17Z | |
| dc.date.issued | 2020-03-17 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/10569 | |
| dc.description.abstract | This thesis work comprises of designing, manufacturing, and experimental test on solar powered evaporative cooling and is designed to provide an environment which is both lower than ambient temperature and at a higher level of relative humidity for the storage of fresh products. Evaporative cooling occurs when air, that is not too humid, passes over a wet surface; the faster the rate of evaporation the greater the cooling effect. The efficiency of an evaporative cooling structure depends on the humidity of the surrounding air. Therefore, this thesis will study the theory, advances, principles, methods of solar powered evaporative cooling, and also the optimum storage temperature, relative humidity and shelf life of vegetables. The experimental setup consists of a rectangular shaped with a specified total storage space, made of galvanized steel for external cover, aluminum for internal cover and internally insulated with fiber glass, a suction axial fan supply volume flow rate of 0.78m3/s air at a speed of 0.93m/s to the wet pad, cooling pad remains wet due the recycling of water with axial pump having flow rate of 0.054kg/s and water recirculates inside the cabinet through high conductive copper tube to remove the heat from the commodities and then water stored at the upper water tank coupled with flow controlling valve. Study is conducted to check the freshness of the agriculture products, and the data is observed hourly and daily. The products shelf life increases when they stored at low temperature and at high relative humidity. Thus, the results of the transient performance tests revealed that the evaporative cooling system temperatures were consistently lower than the ambient air temperatures during the hottest time of the day when insulation was appreciable inside the cooling chamber varied from 16.2 – 22.1°C while in the ambient air temperature varied from 22.6 – 29.8°C.and the evaporative cooling chamber relative humidity is 75 - 90% while at outside it was recorded 66 -80%. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Thermal Engineering | en_US |
| dc.title | Designing and experimental testing of solar powered evaporative cooling to store perishable agricultural products | en_US |
| dc.type | Thesis | en_US |
