CHM ENG 141 Midterm: cheme141-fa2006-mt2-Chu-soln
8 Jan 2019
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Fall 2006: note: for this problem the sign convention used is for quantities into a system are positive and quantities leaving the system are negative, (15 points) H4 is given so h1 can be found from adding the work for the pump or. H1 = h4 +w41 = 188. 4 kj/kg + 8. 676 kj/kg = 197. 1 kj/kg = h1 (3 points) H3 can be found on page 722 of your book (since it is saturated vapor). W23 = h3 h2 = 2584. 8 kj/kg 3391. 6 kj/kg = -806. 8 kj/kg = w23 (3 points) To find h3", we need to know the steam quality, x". S2 = s3" because we are looking at the isentropic case. = 8. 1511 kj/(kg*k) * x" + 0. 6493 kj/(kg*k) * (1-x") x" = 0. 805 (1 point) H3" = hsatvapx" + hsatliq (1-x") = 2584. 8 kj/kg * 0. 804 + 191. 832 kj/kg * (1 0. 804)
