Task 1 Calculate the heat transfer rate for the following composite wall configurations:
(A)Consider a composite plane wall that includes a 10 mm-thick hardwood siding, 50-mm by 120- mm hardwood studs on 0.7m centres with glass fiber insulation (paper faced, 28 kg/m3), and a 15 mm layer of gypsum wall board. What is the thermal resistance per unit area associated with this wall (having 10 studs, each 2.5 m high). In addition, given the temperature at the inlet and outlet surface is 20 C and -15 C, calculate the heat transfer rate though this wall. stud o Wood Siding
120mm
insu lation
o WalI board
K 50mm
(BStainless steel tube is used to transport pharmaceutical liquids,it has an inner diameter of 40 mm and a wall thickness of 4 mm. The pharmaceutical and ambient air are at temperatures of 6 C and 23C, respectively, while the corresponding inner and outer convection coefficients are 400 W/m2 .K and 6 W/m2 K, respectively. (a) What is the heat gain per unit length? (b) What is the heat gain per unit length if a 10 mm thickness layer of calcium silicate insulation (kins = 0.050 W/m. K) is applied to the tube?
HTU aioillalla Al Hussein Technical Uni
Page5of 8
Y=20mm F=22mm
=23 =6Wm3:k n6=
6 insulation 400W/mk kin=O0.05W/mK hiz