ME 3333 Chapter : Homework 10 Solutions
Document Summary
Let the steam power plant in problem 7. 35 have 700oc in the boiler and 40oc during the heat rejection in the condenser. Repeat the question for the cycle operated in reverse as a refrigerator. Find the entropy for the following water states and indicate each state on a t-s diagram relative to the two-phase region: 250oc, v = 0. 02 m3/kg, 250oc, 2000 kpa, 2oc, 100 kpa. Solution: table b. 1. 1: 0. 001251 = vf < v < vg = 0. 05013 m3/kg => two-phase x = Table b. 1. 5: p > psat = 0. 5177 kpa so compressed solid. Water is used as the working fluid in a carnot cycle heat engine, where it changes from saturated liquid to saturated vapor at 200 c as heat is added. Heat is rejected in a constant pressure process (also constant t) at 20 kpa. The heat engine powers a carnot cycle refrigerator that operates between 15 c and +20 c.
