A Single Stage Vapor Compression (SSVC) refrigeration system has a cooling capacity of 7.5 tons. The following are the actual conditions: discharge of the evaporator is at -30°C & 0.2 MPa, discharge of the condenser is at 30°C & 2.0 MPa, discharge of the compressor is at 130°C & 2.5 MPa. Determine the Refrigerating Efficiency of the system PRESSURE, MPa2010864210.80.60.40.20.10.08.0.060.040.020.0100R-32(difluoromethane)100Reference state:h = 200.0 kJ/kg, s= 1.00 kJ/(kg-K)for saturated liquid at 0°C1300:-0.40+0.501250:-80-70;-60-50°C-40-30-20I1000.60-0.701200Properties computed with: NIST REFPROPversion 7.0Saturated Liquid1150-+0.12000.21100:-10-0100.80-0.901.001.102001050-0.3-10001.201.30X = 0.488/9 8 8491.403001.500060.5%1.60-0-80-60300SOL-50T=-30°C-400.6-008-1.80-101.900100.74002.00-700,203040-2.106004002050ㅎ 888 엉...0.8500-W0.92.20-12.30-2.40ENTHALPY, KJ/kg2.50500400Saturated Vapor500-20:300202.80+A--77X40600602.90AKHTheAaiiTR600AN15+-+-₂7.8010043.00Sp = 200 kg/m³150V1120-+140----AM= 3.10 kJ/(kg.160·K)₂S700100-1T3.2008X60T = 180°C3.307001.40302015002.108.06.04.03.02.01.51.00.800.600.400.300.2080020.10.86210.80.60.40.20.10.080.060.040.020.01800Based on formulation of Tillner-Roth and Yokozeki (1997)

Answered: Image /qna-images/answer/8c7422a9-1f44-466d-a0b0-a6f7199afbbe.jpg

0 Properties computed with: NIST REFPROP version 7.0 100 ENTHALPY, kJ/kg 200 300 400 5 0.01 0.02 + 0.40- 0.50 0.60 -0.70 0.80 0.90 1.00 1.10. 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 2.10 2.20 2.30 2.40 2.50 0.04 0.06 0.08 0.1 Copy Saturated Liquid 0.1 0.2. 0.3- x=0.4 0.5 0.6: 0.7 0.8 0.93 Saturated Vap PRESSURE, MPa 0.2 -10 2 -80 -70 -60 -50°C -40 -30 -20 4 1300 1250: 1200 1150- 8-8 8... 8. 6 8 -10 0 > 10 20 30- 40 :50 Reference state: for saturated liquid at 0°C h = 200.0 kJ/kg, s= 1.00 kJ/(kg- -09 70 8.12. 10 ....... (difluoromethane) R-32 Ex 1100 1050- 1000 006 800 700, 009 -500- X 20 0 100 200 300 400

0 Properties computed with: NIST REFPROP version 7.0 100 ENTHALPY, kJ/kg 200 300 400 5 0.01 0.02 + 0.40- 0.50 0.60 -0.70 0.80 0.90 1.00 1.10. 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 2.10 2.20 2.30 2.40 2.50 0.04 0.06 0.08 0.1 Copy Saturated Liquid 0.1 0.2. 0.3- x=0.4 0.5 0.6: 0.7 0.8 0.93 Saturated Vap PRESSURE, MPa 0.2 -10 2 -80 -70 -60 -50°C -40 -30 -20 4 1300 1250: 1200 1150- 8-8 8... 8. 6 8 -10 0 > 10 20 30- 40 :50 Reference state: for saturated liquid at 0°C h = 200.0 kJ/kg, s= 1.00 kJ/(kg- -09 70 8.12. 10 ....... (difluoromethane) R-32 Ex 1100 1050- 1000 006 800 700, 009 -500- X 20 0 100 200 300 400

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter46: Room Air Conditioners

Section: Chapter Questions

Problem 15RQ

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