Abstract
Evaporative cooling system is a physical phenomenon in which the surrounding air cools an object or a liquid in contact with it. An extensive literature has been reviewed. The materials and methods used in the research involves, the two clay pots (bigger and smaller size), water, Okra, measuring devices (Thermometer and Hygrometer), and the wooden cover. A smaller pot was kept inside a bigger clay pot and the Inter-space was filled with river-bed sand which was made moist by adding water thrice a day i.e. morning, afternoon and evening. The result obtained showed that the okra can be stored for 14days in the mean temperature of (27.27, 32.92 and 29.68 OC) and relative humidity of (97.43, 47.08 and 66.30 %). Conclusively, the pot in pot evaporative cooler could be used in New Bussa, Nigeria during the dry season when the temperature is high and relative humidity is low.
Highlights
Evaporative cooling system is a physical phenomenon in which the surrounding air cools an object or a liquid in contact with it
The highest temperature was recorded in the noon due to high intensity of the sun and highest humidity was recorded in the morning due to high cooling effect
The Okra was stored for a period of 14days in pot in pot evaporative cooler, the result shows that there was a reduction in moisture content of the stored produce within the data ranges, this is in agreement with the findings of Ngure et al (2009) who reported that storage of fresh Okra at a temperature between 10 – 20 OC reduces the microbial activities
Summary
Evaporative cooling system is a physical phenomenon in which the surrounding air cools an object or a liquid in contact with it. The greater the difference between the two temperature the greater the evaporative cooling effect. Evaporative cooling system depends on the condition of the air and it is necessary to determine the weather condition that maybe encounter to properly evaluate the possible effectiveness of evaporative coolers (Mentzer and Dale, 1960) and is working best in hot and dry climates. These conditions are common where big part of the population have no access to conventional electrical refrigerators to keep fruits, vegetable and forages fresh in hot and dry climates.
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