Fundamentals Of Thermal-fluid Sciences In Si Units
Fundamentals Of Thermal-fluid Sciences In Si Units
5th Edition
ISBN: 9789814720953
Author: Yunus Cengel, Robert Turner, John Cimbala
Publisher: McGraw-Hill Education
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Question
Chapter 1, Problem 15P
To determine

The constant-pressure specific heat of air at 25°C in kJ/kgK, J/g°C, kcal/kg°C and Btu/lbm°F.

Expert Solution & Answer
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Explanation of Solution

Write the expression of conversion relation for the constant-pressure specific heat of air from kJ/kg°C to kJ/kgK.

  cp(kJ/kg°C)=cp(kJ/kg°C)×1kJ/kgK1kJ/kg°C=cp(kJ/kgK)

Convert the unit of constant-pressure specific heat of air from kJ/kg°C to kJ/kgK at 25°C using the above relation.

  cp=1.005kJ/kg°C=1.005kJ/kg°C×1kJ/kg°C1kJ/kgK=1.005kJ/kgK.

Thus, the constant-pressure specific heat of air at 25°C in kJ/kgK is 1.005kJ/kgK.

Write the expression of conversion relation for the constant-pressure specific heat of air from kJ/kg°C to J/g°C using the above relation.

  cp(kJ/kg°C)=cp(kJ/kg°C)×1000J1kJ×1kg1000g=cp(J/g°C)

Convert the unit of constant-pressure specific heat of air from kJ/kg°C to J/g°C at 25°C.

  cp=1.005kJ/kg°C=1.005kJ/kg°C×1000J1kJ×1kg1000g=1.005J/g°C

Thus, the constant-pressure specific heat of air at 25°C in J/g°C is 1.005J/g°C.

Write the expression of conversion relation for the constant-pressure specific heat of air from kJ/kg°C to kcal/kg°C using the above relation.

  cp(kJ/kg°C)=cp(kJ/kg°C)×1kcal4.1868kJ=cp(kcal/kg°C)

Convert the unit of constant-pressure specific heat of air from kJ/kg°C to kcal/kg°C at 25°C using the above relation.

  cp=1.005kJ/kg°C=1.005kJ/kg°C×1kcal4.1868kJ=0.240kcal/kg°C

Thus, the constant-pressure specific heat of air at 25°C in kcal/kg°C is 0.240kcal/kg°C.

Write the expression of conversion relation for the constant-pressure specific heat of air from kJ/kg°C to Btu/lbm°F using the above relation.

  cp(kJ/kg°C)=cp(kJ/kg°C)×1Btu/lbm°F4.1868kJ/kg°C=cp(Btu/lbm°F)

Convert the unit of constant-pressure specific heat of air from kJ/kg°C to Btu/lbm°F at 25°C using the above relation.

  cp=1.005kJ/kg°C=1.005kJ/kg°C×1Btu/lbm°F4.1868kJ/kg°C=0.240Btu/lbm°F

Thus, the constant-pressure specific heat of air at 25°C in Btu/lbm°F is 0.240Btu/lbm°F.

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Chapter 1 Solutions

Fundamentals Of Thermal-fluid Sciences In Si Units

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