Sustainable Energy
Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Chapter 8, Problem 9P
To determine

Find the required minimum (ability of conduct heat) RSI value for wall and roof.

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Consider a house that is approximated as a cube that is 8 m on a side and has no windows. The house loses heat from the four walls and the roof. For an inside temperature of 20°C and an outside temperature of –20°C, it is desired to keep the total heat loss less than 5 kW. What is the minimum RSj value that is required for the walls and roof?
A line was measured to be 412 m using a 30-m tape, which is of standard length at a temperature of 20 deg.C. During measurement, the temperature was 52 deg.C. If the coefficient of thermal expansion of the tape material is 0.0000116 m/m deg.C, calculate the correct length of the line.
An insulated steam pipe having outside diameter of 3 cm is to be covered with two layers of insulation each having a thickness of 2.5 cm. the thermal conductivity of one material is 5 times that of the other assuming that the steam pipe surface temperature and outer air temperature remain fixed . how much change in heat transfer take place if the better insulating material is next to the pipe than it is on outer side?
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