A 2.8-mm diameter and 15-m long electric wire is covered with a 2.2-mm layer of insulation having thermal conductivity of 0.06 W/m.K. The electric current generates heat at the rate of 115 W. The wire is exposed to an environment at 20°C and a natural convection coefficient of 7 W/m₂K. What will be the temperature at the surface of the pipe? Determine the maximum extra insulation that can be added to enhance cooling.

Q: In a multi-layered rectangular wall, the thermal resistance of the first layer is 0.005 ° C / W, the…

A: Given: Case 1 R1= 0.005 ° C / W R2 = 0.4 ° C / W R3 = 0.1 ° C / W ∆T = 70 ° C.   Case 2 R1= 0.005 °…

Q: Steel pipe (outer diameter 100 mm) is covered with two layers of insulation. The inner layer, 40 mm…

A:

Q: 6) Problem 4.7-6 (Page 350): Natural Convection Heat Loss in Double Window. 4.7-6. Natural…

A: Given that T1 =25 CT2 =10 Ch=2 mw=1.2 m Ra

Q: Steel pipe 1 cm thick, 1.0 m long and 5 cm deep, covered with 2 cm thick insulation. The wall…

A:

Q: Consider a 0.8-m-high and 1.5-m-wide glass window with a thickness of 8 mm and a thermal…

A: Given, thermal conductivity, k = 0.78 W/m·°C Heat transfer coefficient at inside, hi = 10 W/m2·°C…

Q: Q.8 A circular tube of outer diameter 5 cm and inner diameter 4 cm is used to convey hot fluid. The…

A:

Q: A circumferential fin of rectangular profile has a thickness of 0.7 mm and is installed on a tube…

A: Assumptions- Thickness = y Convective heat transfer coefficient = h Thermal conductivity of fin…

Q: 2. Water at 80°C is pumped through 100 m of stainless steel pipe of inner and outer radii 47 mm and…

A: Given data: Water at 80oC is pumped through 100m stainless steel. Inner radii=47mm=0.047m outer…

Q: A loaf of bread having a surface temperature of 373 K is being baked in an oven whose walls and the…

A: given Temperature of body Tb=373 K Temperature of the surrounding Ts=477.4 K Emissivity e=0.85…

Q: The side walls of a refrigerator are made from two thin layers of sheet metal, each 4 mm thick, and…

A: The heat loss through the refrigerator is to be determined.

Q: Problem 1 A concrete wall (plane wall) of 20-cm-thick, is subjected to convection on both sides. In…

A:

Q: A round tube (ID = 60mm, OD = 80mm) carrying liquid ammonia has a constant surface temperature of…

A: Given, Density of air, ρ = 1.225 kg/m3 Inner diameter of the insulation, D = 80 mm +2×8 mm= 96×1…

Q: = 1-D heat transfer.

A:

Q: A 5 cm thick steel pipe, 1.0 m long, with an internal diameter of 8 cm is covered with 4 cm thick…

A:

Q: Steel pipe 3 cm thick, 1.0 m long and 10 cm deep, covered with 6 cm thick insulation. The wall…

A: Given data: Thickness of steel pipe = 3 cm Length of pipe = 1 m Depth of pipe= 10 cm Thickness of…

Q: 4) Consider one-dimensional conduction in a plane composite wall.  The outer surfaces are exposed to…

A: