Question

2. Please consider 3.4 lbm air that was originally at room temperature (25 C) and atmospheric pressure that passed through a heat exchanger. The air absorbed 1.15 kJ. a. Given the problem statement and our discussions in class, can we model the air as an Ideal Gas and expect that the error will be tolerable? Why? If not, please recommend a model for the air i.e., real gas behaving ideally, Virial Eq. etc.) b. Please determine the change in the air temperature in K.

Answer 1

solution- @ Pv=znRt where pis pressure, v volume, n numbers of moles, R aconsta and T temperature. Pay an ideal gas z is effectively equal to exactly 1 and falls out of equation. If you refer th air compressibility factor for Z at 1 atmosphere and 300 k (about 27°c) the z is pretty much 0.9999 so fout most purpose of is effectively ideal at various Tond P the degree of ide ality. changés. Q = mcp AT 3.4.ebm= 1:5422 kg Q = 3.4X1:005x (AT) 1:15= 1:5422x1:005 AT TOT = 0.7419 K lana Pair 1.005 kJ/kg-k