Experiment 9Evaporator Analysis &

Coefficient of Performance

Ideal Refrigeration Cycle

• 1-2 Isentropic compression in a compressor• 2-3 Constant-pressure heat rejection in a condenser• 3-4 Throttling in an expansion device• 4-1 Constant-pressure heat absorption in an evaporator

4. Evaporator

1. Compressor

2. Condenser

3. Expansion valve

Set-Up Procedure1. Turn on Fans2. Expansion valve up to 45

mm in the rotameter scale

3. Wait 4 min4. Record difference of

pressure5. Record temperature

Shut-Down1. Close receiver outlet V62. Wait 4 min and close

receiver inlet V5

Outlet Pressure of Compressor PH (Psi) Inlet Pressure of Compressor PL(inch Hg, 1 inch Hg=0.491 Psi) Channel 102 Outlet Temperature of Evaporator T2(F) Channel 103 Inlet Temperature of Evaporator T3(F) Channel 104 inlet Temperature of Condenser T4(F) Channel 105 Outlet Temperature of Condenser T5(F) Channel 106 Discharge Temperature of Compressor T6(F) Channel 107 Suction Temperature of Compressor T7(F) Channel 110 (Volts) Volume Flow Rate : Channel 110 × 43.07 (ml/min) Voltage of the Compressor V (volts)Current of the Compressor I (ampere)

Data to Record

Data Analysis

1. Follow the lab manual to do the data analysis.2. Property tables of the refrigerant (HCFC-123) are available on Dr. Alvarado’s website:http://etidweb.tamu.edu/classes/entc370/