Question

Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, has an evaporator temperature of -20°C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:

Answer 1

Given Ti=-20°C Zhizhg= 4417-79 kJ/kg Xi = 1 JS,=59=.5-6144 kJ (kg -* P2 = 12b ve 322=1689.5 KJ 1kg Si=S2 Jºey 7=l2 brak hae 327-01 Ks]kg 23=0 hoch4=327.01 kJ/kg Assumption 1. steady operating condition exist 2. Kinetic and potential energy changes are negligible

Schematic gout tuita Condenser Pochie expansion V valve A acompressor exaporator tre - 1 Join nefrigerating capacity, sine mhi-ha) (1417.79-327-01) Bin = sin = 54.54 kW XL [Bin = 15.6 ton] - hi-he-141779-327.01 T6 89.5-141779 Win hz-hi COP=lins [Cop=4:01