Answer Happy

REF134A
A Cascade refrigeration system using flash tank and intercooler
is operating an evaporator with a capacity of 10 tons at a
temperature of -30°C. The flash tank and intercooler is operated at
0.40 MPa. If the condensing temperature is 50°C, determine the COP
and the refrigerating efficiency of the system. Draw the schematic
diagram of the system and assume ideal conditions.
100 150 200 250 300 350 400 450 500 550 20 600 20 1050 OOK R-134a (1.1.12) Reference 2000 100K) for strated liquidat O'C 350 1209 700 1150 10 8 1100 800 pe 500 kg/m 400 1000 0 0 10 8 300 6 88 200 6 1450 1400 350 4 150 4 T-40C 100 80 2 60 N 2 40 40 30 1 0.8 30 G- 888 1 0.8 0.6 20 0.6 20 PRESSURE, MPa 0.4 10 o 0.4 10 8.0 0.2 T-10°C 6.0 10889898,5 8 8 0.2 -20 4.0 100 09 3.0 0.1 0.08 0.06 -30 0.1 0.0a 2.0 po ino 1.5 0.06 40 0.04 0.04 1.0 0.80 -50 0.80 - -0.70 0.02 -1.00 -1 -060 - 1.10 - 120 -1.30 - 1.40 1.50 1.70 1.60 - 200 2.10 22 C4. DUPOEZ 0.60 0.02 0.40 0.01 100 150 200 250 0.01 600 450 500 550 300 350 400 ENTHALPY, kJ/kg Properties computed with: NIST REFPROP 70 Based on formulation of Romand (1994