Experiment 9 Evaporator Analysis & Coefficient of
Performance
Slide 2
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
Slide 3
4. Evaporator 1. Compressor 2. Condenser 3. Expansion valve
Set-Up Procedure 1.Turn on Fans 2.Expansion valve up to 45 mm in
the rotameter scale 3.Wait 4 min 4.Record difference of pressure
5.Record temperature Shut-Down 1. Close receiver outlet V6 2. Wait
4 min and close receiver inlet V5
Slide 4
Outlet Pressure of Compressor P H (Psi) Inlet Pressure of
Compressor P L (inch Hg, 1 inch Hg=0.491 Psi) Channel 102 Outlet
Temperature of Evaporator T 2 (F) Channel 103 Inlet Temperature of
Evaporator T 3 (F) Channel 104 inlet Temperature of Condenser T 4
(F) Channel 105 Outlet Temperature of Condenser T 5 (F) Channel 106
Discharge Temperature of Compressor T 6 (F) Channel 107 Suction
Temperature of Compressor T 7 (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
Slide 5
Data Analysis 1. Follow the lab manual to do the data analysis.
2. Property tables of the refrigerant (HCFC-123) are available on
Dr. Alvarados website:
http://etidweb.tamu.edu/classes/entc370/