Solution cont. 75°C State 3 (outlet of condenser): 14 bar (28C,14bar),subcooled liquid 3 28℃ Table R22Sat:sa s(28C)=0.2936kJ/kg-K h3≈h(28C=79.05k/kg 3.5 bar State 4 (outlet of throttling valve): h4=h3,p4=3.5bar,two-phase P4=3.5bar→h4=33.09,hg4=212.91 (h4-h4)(79.05-33.09) X4= 0.216 (hg)4 (212.91) =5 4+x4(sg4-54)=0.1328+0.216(0.9431-0.1328)=0.3078kJ/kg·K 上游充通大学 April 26,2018 15 SHANGHAI JIAO TONG UNIVERSITYApril 26, 2018 15 Solution cont. State 3 (outlet of condenser) : (28˚C, 14bar), subcooled liquid Table R22Sat: s3≈ sf (28˚C)=0.2936kJ/kg-K h3≈ hf (28˚C)=79.05 kJ/kg State 4 (outlet of throttling valve) : h4=h3 , p4=3.5bar, two-phase p4=3.5barhf4=33.09, hfg4=212.91