Question

Do part B with matlab code

The rear window of an automobile is defogged by attach ing a thin, transparent, film-type heating element to its inner surface. By electrically heating this element, a uni- form heat flux may be established at the inner surface For 4-mm-thick window glass, determine the electrical power required per unit window area to maintain arn inner surface temperature of 15°C when the interior air temperature and convection coefficient are To 25°C and hi = 10 W/m2-K, while the exterior (ambient) air temperature and convection coefficient are T 10°C and ho-65 W/m2, K. (b) In practice and h vary according to weather conditions and car speed. For values of ho-2, 20. 65, and 100 W/m2.K. determine and plot the electrical power requirement as a function of To for 30 7..。 0°C. From your results, what can you conclude about the need for heater operation at low values of h? How is this conclusion affected by the value ofT If h V", where Vis the vehicle speed and n is a positive exponent, how does the vehicle speed affect the need for heater operation?

Answer 1

The enexgy balance at the inner suface isese as hi Reasranghrg the above eguation doe O, 004 m ow/mk ti s( 1370, 48-100)