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۱The Best Gap Length between the Black Hot Pot and Glass Bowl for the Used Greenhouse in Solar Cooker
اطلاعات انتشار: World Applied Sciences Journal، سي و چهارم،شماره۹، ۲۰۱۶، سال ۰
تعداد صفحات: ۸
The performance of solar equipments is depending on a lot of parameters. One of them is the heat losses from absorber to surrounding. Greenhouse is the best guard for absorber black pot at solar cooker from heat loss. In this paper, the heat loss from hot absorber surface to enclosure air between black pot and glass bowl was studied to obtain the best distance between them according to convection heat losses. The selected black pot and glass bowl are concentric spheres. It will be study by using a fixed black pot outer diameter (250 mm) and much different glass bowls dimensions. The gap length between black pot and glass bowl a length will be start from 1 mm to 50 mm with step 1 mm. Theoretical analyses are performed by using a computer program. The theoretical studied shows that best gap length was 13mm to obtain lowest theoretical convection heat losses. The effect of the gap length, temperature differences T, Nusselt number and the Rayleigh number on average heat transfer coefficients are investigated within a range of (1 50) mm, (4 135 A 4 185 ) 22 o mm , (5 T 55) °C with step 5°C and 0.05354 Ra 1.588 × 10 . 2
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