Question

Ideal vapor compression cycle using R-134a with condenser and evaporator pressure of 800 kPa and 165 kPa, respectively. Find the COP of the cycle

Answer 1

swer:. 800 kPa S+ Figure: Ideal vapour compression cycle Saturated refoigerent 134-a: Pressure = 165 kPa | Pressure I hg(kJ lkg) SgC kJ / kg k) 160kPa 241.11 165kPa 1 80 kPa 242.86 0.93965 ). 9419 he S Using interpolation :- 1650160 hi-au111 180-160 242.86- 241:11 Thi= 241.5475 kJ/kg - 165-160 = 180 - 160 Soro.guig 0.93965-0.9419 Si=0.9407375 kJ lkg k Superheated refrigessent R-1349:- Pressure = 6-8 MPa S,= S2 fisentropic compression? = 800 kPa SCkJ lkg k) h(kJ/kg) 1 0.9183 246.79 Si= $2=0.9407375 - hz o 9480 254.82

- 0.9407375-0.9183 – 0.9480-0.9183 hz - 246.79 254.82 - 0.9183 1h2 = 252.8564 KJ /kg Saturated refrigerant R-1349 :. Pressure P = 80kPa I ho=hf= 95.47 KJ /kg Process 3-4:- Isoonthalpic process Tho=he = 95.47 kJ /kg) = hiphy - COP - Refrigeration effect Work input - Thathi Cop= 241.5475-95.47 - = 12.92 252.8564-241.5475 . 1 12.92 ی دهید Cop of ideal vers cycleſ.copz 12-92 ] Answer Cop VCRS