Answer: Considering Constant-Composition ProcessesAn
Chapter 12, Problem 25P(choose chapter or problem)
An equimolar mixture of \(\mathbf{N}_{2}\) and \(\mathbf{CO}_{2}\) enters a heat exchanger \(-40^{\circ} \mathrm{F}, 500 \mathrm{lbf} / \text { in. }^{2} \text { and exits at } 500^{\circ} \mathrm{F}, 500 \mathrm{lbf} / \mathrm{in} .^{2}\) The heat exchanger operates at steady state, and kinetic and potential energy effects are negligible.
(a) Using the ideal gas mixture concepts of the present chapter, determine the rate of heat transfer to the mixture, in Btu per lbmol of mixture flowing.
(b) Compare with the value of the heat transfer determined using the generalized enthalpy chart (Fig. A-4), together with Kay’s rule (see Sec. 11.8).
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