When 10 kcal of heat is added to 2.0 kg of a substance, its temperature increases 20 C°. What is the specific heat of the substance?
0.25 kcal/kg • C°
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A solution with a boiling point of 82°C boils on the outside of a 2.5 cm tube with a No. 14 BWG gauge wall. On the inside of the tube flows saturated steam at 40 kPa(abs). The convection heat transfer coefficients are 8.5 kW/(m2 K) on the steam side and 6.2 kW/(m2 K) on the exterior surface. Calculate the increase in the rate of heat transfer if a copper tube is used instead of a steel tube
GIVEN
• Tube with saturated steam on the inside and solution boiling at 82°C outside
• Tube specification: 1 in. No. 14 BWG gauge wall
• Saturated steam in the pipe is at 40 kPa(abs)
• Convective heat transfer coefficients
? Steam side ( ci h ) : 8.5 kW/(m2 K)
? Exterior surface ( co h ) : 6.2 kW/(m2 K)
FIND
• The increase in the rate of heat transfer for a copper over a steel tube
ASSUMPTIONS
• The system is in steady state
• Constant thermal conductivities
SKETCH
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Fill in the blank(s) with correct word
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Fill in the blank(s) with the appropriate word(s).
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Fill in the blank(s) with correct word