Questions from Principles Of Heat Transfer

Q: A 0.3-cm-thick aluminum plate has rectangular

A 0.3-cm-thick aluminum plate has rectangular fins 0.16 cm * 0.6 cm, on one side, spaced 0.6 cm apart. The finned side is in contact with low pressure air at 38oC, and the average heat transfer coeffi...

Q: Derive an expression for the temperature distribution in a plane wall in

Derive an expression for the temperature distribution in a plane wall in which there are uniformly distributed heat sources that vary according to the linear relation where qw is a constant equal to t...

Q: Compare the rate of heat flow from the bottom to the top

Compare the rate of heat flow from the bottom to the top of the aluminum structure shown in the sketch below with the rate of heat flow through a solid slab. The top is at -10°C, the bottom...

Q: Determine by means of a flux plot the temperatures and heat flow

Determine by means of a flux plot the temperatures and heat flow per unit depth in the ribbed insulation shown in the accompanying sketch.

Q: If the outer air temperature in Problem 1.11 is 22

If the outer air temperature in Problem 1.11 is 22°C, calculate the convection heat transfer coefficient between the outer surface of the window and the air, assuming radiation is negligible.

Q: Use a flux plot to estimate the rate of heat flow through

Use a flux plot to estimate the rate of heat flow through the object shown in the sketch. The thermal conductivity of the material is 15 W/m K. Assume no heat is lost from the sides.

Q: Determine the rate of heat transfer per meter length from a 5

Determine the rate of heat transfer per meter length from a 5-cm-OD pipe at 150oC placed eccentrically within a larger cylinder of 85% magnesia wool as shown in the sketch. The outside diameter of the...

Q: Determine the rate of heat flow per meter length from the inner

Determine the rate of heat flow per meter length from the inner to the outer surface of the molded insulation in the sketch on the next page. Use k = 0.17 W ( m K ) .

Q: A long, 1-cm-diameter electric copper cable is

A long, 1-cm-diameter electric copper cable is embedded in the center of a 25-cm-square concrete block. If the outside temperature of the concrete is 25oC and the rate of electrical energy dissipation...

Q: A large number of 3.8-cm-OD pipes

A large number of 3.8-cm-OD pipes carrying hot and cold liquids are embedded in concrete in an equilateral staggered arrangement with centerlines 11.2 cm apart as shown in the sketch. If the pipes in...