Solution 75C Assumption: 14 bar 1.Steady state 28C 2.CV:Qcv=0,Wev=0 3.Compressor:adiabatically 3.5 bar 4. Expansion valve:throttling process 5. ideal gas model for air,cp=1.0 kJ/kg-K 6.ignoring APE and AKE of the streams from inlet to exit. Retrieving properties: State 1 (inlet of compressor):(-5C,3.5bar),superheated vapor Table R22:s=0.9572 kJ/kg-K State 2 (outlet of compressor):(75C,14bar),superheated vapor Table R22:s2=0.98225k/kg-K,h2=294.17k/kg 上游充通大 April 26,2018 14 SHANGHAI JLAO TONG UNIVERSITYApril 26, 2018 14 Solution Assumption: 1. Steady state 2. CV: Qcv=0, Wcv=0 3. Compressor: adiabatically 4. Expansion valve: throttling process 5. ideal gas model for air, cp=1.0 kJ/kg-K 6. ignoring ∆PE and ∆KE of the streams from inlet to exit. Retrieving properties: State 1 (inlet of compressor) : (-5˚C, 3.5bar), superheated vapor Table R22: s1=0.9572 kJ/kg-K State 2 (outlet of compressor) : (75˚C, 14bar), superheated vapor Table R22: s2=0.98225kJ/kg-K, h2=294.17 kJ/kg