Question

Given the following information about a system, calculate specific enthalpy (in Btu/lbm).

(a) 629.6 btu/lbm

(b) 639.6 btu/lbm

(c) 660.9 btu/lbm

(d) 640.9 btu/lbm

I had been asked this question in a national level competition.

My doubt stems from Basic Energy Concepts in chapter Energy Balance of Bioprocess Engineering

Answer 1

Correct choice is (a) 629.6 btu/lbm

Easiest explanation: h = u + Pv

h = \(600 \frac{Btu}{lbm} + (100 \frac{lbf}{in^2}) (1.6 \frac{ft^3}{lbm}) (144 \frac{in^2}{ft^2}) (\frac{Btu}{778 \,ft-lbf})\) = 629.6 btu/lbm.