Thermodynamics HW Solutions 241

Thermodynamics HW Solutions 241 - Chapter 3 Steady Heat...

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Chapter 3 Steady Heat Conduction Heat Transfer In Common Configurations 3-120C Under steady conditions, the rate of heat transfer between two surfaces is expressed as where S is the conduction shape factor. It is related to the thermal resistance by S=1/(kR) . & ( QS k TT =− 12 ) 3-121C It provides an easy way of calculating the steady rate of heat transfer between two isothermal surfaces in common configurations. 3-122 The hot water pipe of a district heating system is buried in the soil. The rate of heat loss from the pipe is to be determined. Assumptions 1 Steady operating conditions exist.
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