Chapter 4, Problem 4.4P

Interpretation Introduction

Interpretation:

The transferred heat (through air) per second when temperature of the air is increase from ${\text{122}}^{\text{0}}\text{F}$ to ${\text{932}}^{\text{0}}\text{F}$ should be determined.

Concept Introduction :

The transfer of heat in steady-flow exchangers for a gas is given as:

  $Q=n\Delta H=R{\displaystyle \underset{T_0}{\overset{T}{\int }}\frac{\Delta C_P}{R}dT}$......(1)

Where $\Delta H$ is heat of reaction at any temperature $T$ .

and

  ${\displaystyle \underset{T_0}{\overset{T}{\int }}\frac{\Delta C^{\circ }{}_P}{R}dT}=A{T}_0(\tau -1)+\frac{B}{2}{T}_0{}^2({\tau }^2-1)+\frac{C}{3}{T}_0{}^3({\tau }^3-1)+\frac{D}{T_0}(\frac{\tau -1}{\tau })$......(2)

Where $\tau =\frac{T}{T_0}$