Questions from Principles Of Heat Transfer

Q: On a cold winter day, the outer surface of a 0

On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed to a temperature of 25°C, while the inner surface is kept at 20°C. The thermal co...

Q: A heat flux meter at the outer (cold) wall of

A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss through a wall of 10-cm thickness is 20 W/m2. If a thermocouple at the inner surface of the wall indicate...

Q: Show that the rate of heat conduction per unit length through a

Show that the rate of heat conduction per unit length through a long, hollow cylinder of inner radius ri and outer radius ro, made of a material whose thermal conductivity varies linearly with tempera...

Q: A long, hollow cylinder is constructed from a material whose thermal

A long, hollow cylinder is constructed from a material whose thermal conductivity is a function of temperature according to = 5 0.15 + 0.0018T, where T is in oC and k is in W/(m K). The inner and oute...

Q: Derive an expression for the temperature distribution in an infinitely long rod

Derive an expression for the temperature distribution in an infinitely long rod of uniform cross section within which there is uniform heat generation at the rate of 1 W/m. Assume that the rod is atta...

Q: Heat is generated uniformly in the fuel rod of a nuclear reactor

Heat is generated uniformly in the fuel rod of a nuclear reactor. The rod has a long, hollow cylindrical shape with its inner and outer surfaces at temperatures of Ti and To, respectively. Derive an e...

Q: In a cylindrical fuel rod of a nuclear reactor, heat is

In a cylindrical fuel rod of a nuclear reactor, heat is generated internally according to the equation Calculate the temperature drop from the centerline to the surface for a 2.5-cm-diameter rod havin...

Q: The shield of a nuclear reactor is idealized by a large 25

The shield of a nuclear reactor is idealized by a large 25-cm-thick flat plate having a thermal conductivity of 3.5 W/(m K). Radiation from the interior of the reactor penetrates the shield and there...

Q: An electrical heater capable of generating 10,000 W is to

An electrical heater capable of generating 10,000 W is to be designed. The heating element is to be a stainless steel wire having an electrical resistivity of 80 * 10-6 ohm-centimeter. The operating t...

Q: A hollow sphere with inner and outer radii of R1 and R2

A hollow sphere with inner and outer radii of R1 and R2, respectively, is covered with a layer of insulation having an outer radius of R3. Derive an expression for the rate of heat transfer through th...