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: The inner and outer surfaces of a 0.5-cm-thick 2 m x 3 m window glass in summer are 48°C and 18°C,…

A: Given  Temperature inside wall T1 = 18 oC Temperature outside of wall T2 =48 oC Conductivity of wall…

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

A:

Q: 4. Calculate the heat loss per linear foot from a 10.3 in. nominal pipe (outside diameter=10.75 in.)…

A: the solution of above question is 317.65 Btu/hr-ft the detailed answer is given below.

Q: A 2-in. Sch. 10 pipe (Steel Type 321) is maintained at an inside temperature of 520 K for a heat…

A: Given details,                     A 2 inch schedule 10  pipe                      inside…

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: 6. In a long rectangle fin, its material has thermal conductivity of 200 w/ m.K and is subjected to…

A:

Q: 2) Three materials are connected as the following figure. The heat conductivity coefficient of…

A:

Q: The inner and outer surfaces of a 0.5-cm-thick 2 m x 3 m window glass in summer are 48°C and 18°C,…

A: As per our guidelines, we are supposed to answer only 3 sub parts.

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: The heat loss to the gas if the length of the pipe is 5.0 ? b. The temperature drop due to 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: The inner and outer surfaces of a 0.5-cm-thick 2 m x 3 m window glass in summer are 48°C and 18°C,…

A: GIVEN THAT  INSIDE TEMPERATURE T1 = 18oC Out side temperature T2 = 48oC Heat trasfer area A = 2×3…

Q: Air at 20°C blows over a 50 x 75 cm hot plate made of carbon steel (AISI 1010) with 2 cm thickness.…

A:

Q: Cylindrical surface multilayer Problem: A steam pipe line with inside diameter of 150 mm and outside…

A: From the given diameter we will obtain three radii and name them accordingly. The temperatures are…

Q: A harizantal tube carrying hat water has a surface temperature of 355.4 K and an outside diameter of…

A: Given data: Surface temperature of pipe = 355.4 K Outside diameter of pipe = 25.4 mm Room…

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: 6.32- Consider a wall-mounted power transistor that dissipates 0.18W of power in an environment at…

A:

Q: = 1-D heat transfer.

A:

Q: Consider one-dimensional conduction in a composite flat wall. The external surfaces are exposed to a…

A: General GuidanceThe question is based on the concepts of the first order linear temperature…

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: 400 circumferential fins of rectangular profile (k = 386 W/m °C) are installed on a tube having a…

A:

Q: A pipe has a 120 °C inside surface temperature, 10 cm inside diameter, 6 mm wall thickness and 30…

A:

Q: 1. A 2-in. Sch. 10 pipe (Steel Type 321) is maintained at an inside temperature of 520 K for a heat…

A: A 2 inch schedule 10  pipe  Inside temperature = 520 K  thickness of fireclay insulation layer (x2)…

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: The circular base, 4 mm thick, of a pan with a diameter of 150 mm can be made of materials with…

A: The thickness of the base of the circular pan=4mm=0.004m Diameter of the base=150mm=0.15m The amount…

Q: coefficient (h). Dreive the critical insulation thickness and explaine the effect of re on the rate…

A:

Q: A gas nside a 25in steel pipe. kness covers the steel pipe. The convective heat-transfer coefficient…

A:

Q: Water flows through a pipe at an average temperature of 7-50°C. The inner and outer radii of the…

A: Given: The pipe has an inner radius of r1 = 6 cm and outer radius ry = 6.5 cm, The average…

Q: Problem: The insulating materials chrombrick, magnesite and refractory brick are arranged in series…

A:

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

A:

Q: Q2: An electrical hot plate that work ona 800W heater iron plate is exposed to the air at 20°C. The…

A: Given Heat transferred through the electrical hot plate=800 W temp of air=20o C=293 K emissivity of…