Question

Introduction Question 41-45 are based on the information provided here. Air enters a counter-flow heat exchanger at a rate of 5000 cubie feet per minute and at a temperature of 50°F and pressure of 14.7 psi. The air is heated by hot water flowing through the same heat exchanger at a rate of 11,200 Ib/sec with a decrease in the hot water temperature of 10°F. ÍC Air = 0.24 Btu/lbm-R, Cwaterー1.0 Btu/Ibm . R, Riir-53.35 ft-lbnom . R1 41. The specifie volume of the air entering the heat exchanger in ft lbm is approximately al 11.85 Ibl 12.85 [cl 13.85 [d] cannot be determined. 42. The mass flow of the air entering the heat exchanger in lbm/hr is approximately [a] 18,340 Ibl 23,340 el 28,340 Id] cannot be determined. 43. The is heat loss of the hot water qwater in Btu/see is approximately al 102,000 Ibl 112,000 [e] 122,000 Id] cannot be determined. 44. The heat gain of the air qair in Btu/hr is al qir qWater bl qair qWater el gairqWater IdJ cannot be determined. 45. The air exit temperature in °F is approximately al 30 bl 50 lel 70 Id] cannot be determined.

Answer 1