Working substance:p-h diagram 4000 3000 R134a 2000 cond4055℃ 1000 ressure 900 800 00 700 ratio 600 500 v阳105C ×2.0-3.0 evap 400 小年年想想年年想中期想期用” 300 200 100 30 Enthalpy [kJ/kg] 40 50 x-0.10 020 0.30 0.40 0.50 0.60 0.70 0.80 0.90 40 20 =020 0.40 0.60 0.80 100 120 140 160 180 200 220 300 150-250W △h≈120~150k/kg 240260280 △h≈25~35k/kg evap.r m.Ah = im△h comp.e ≈65% 3.5-6.0kg/hr (COP. 50-80W comp,e 上泽文通大学 3.0-5.0 May9,2019 5 SHANGHAI JIAO TONG UNIVERSITYMay 9, 2019 5 comp,e evap,r COP W Q MSRS  150-250 W Enthalpy [kJ/kg]  Pressure ratio  2.0-3.0 h 120~150 kJ/kg Qevap,r  m  r h Tevap: 10-25 C Tcond: 40-55 C h 25~35 kJ/kg  r comp,e o,is m h W     65% 3.5-6.0 kg/hr 50-80 W 3.0-5.0 R134a Working substance: p-h diagram