3.3 The rear window of an automobile is defogged by attaching a thin, transparent, film-type heating element to its inner surface. By electrically heating this element, a uniform heat flux may be established at the inner surface.
(a) For 4-mm-thick window glass, determine the electrical power required per unit window area to maintain an inner surface temperature of 15 when the interior air temperature and convection coefficient are =25 and = 10 W/ , while the exterior (ambient) air temperature and convection coefficient are =-10 and = 65 W/
(b) In practice and very according to weather conditions and car speed. For values of =2, 20, 65, and 100 W/ , determine and plot the electrical power
3.3 The rear window of an automobile is defogged by attaching a thin, transparent, film-type heating element to its inner surface. By electrically heating this element, a uniform heat flux may be established at the inner surface.(a) For 4-mm-thick window glass, determine the electrical power required per unit window area to maintain an inner surface temperature of 15 when the interior air temperature and convection coefficient are =25 and = 10 W/ , while the exterior (ambient) air temperature and convection coefficient are =-10 and = 65 W/ (b) In practice and very according to weather conditions and car speed. For values of =2, 20, 65, and 100 W/ , determine and plot the electrical power
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