We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy

# Heat Transfer Essay

The roof of a refrigerated truck compartment is of composite construction, consisting of a layer of foamed urethane insulation (t2 = 40mm, ki = 0. 03W/mK) sandwiched between aluminium alloy panels (t1 = 6mm, kp = 200W/mK). The length and width of the roof are L = 12m and W = 4m respectively. The temperature of the refrigerated space within the truck is –15? C. The solar absorptivity and the emissivity of the outer surface are (S = 0. 3 and ( = 0. 7. Consider conditions for which the truck is moving at a speed of V = 90km/h, the air temperature is T( = 30? C and the solar irradiation is GS = 900W/m2.

We will write a custom essay sample on Heat Transfer specifically for you
for only \$16.38 \$13.9/page

Order now

Assume turbulent flow over the entire roof. Take the average convection coefficient on the inner surface of the roof to be 0. 5W/m2K. i) Derive an equation for the average temperature of the outer surface Ts,o in the form and hence show that Ts,o ( 302K = 29? C. Assume a film temperature of 300K and neglect irradiation from surroundings. (No marks if your equation is not in the above form) ii) Determine the corresponding heat load imposed on the refrigeration system. iii) The average convection coefficient assumed for the inner surface of the roof is relatively low. Explain why this is so. [pic] ———————– [pic] [pic]

Choose cite format:

We will write a custom paper sample onHeat Transferspecifically for you

for only \$16.38 \$13.9/page
Order now

Our customer support team is available Monday-Friday 9am-5pm EST. If you contact us after hours, we'll get back to you in 24 hours or less.