# Thread: Plotting the Refrigerant Cycle

1. Regular Guest
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Aug 2011
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## Plotting the Refrigerant Cycle

Hello! I am an HVAC student in Wichita, KS. Yesterday, our instructor was teaching us how to plot on Pressure-Enthalpy charts also called Pressure-heat charts or Mollier Diagrams. Unfortunately he really did a bad job of showing us how to do it, and we all left class confused. I was wondering if someone could provide some good links or information to help me understand how to plot my data on the chart.

We were working with R-22 and these are my readings. Keep in mind, the trainer machines we have are nearly 20 years old and have been abused over the years.

Low Side:
72 PSIG = 42degF
Suction Line Measured: 59degF
17deg Superheat

High Side:
220 PSIG = 107degF
Liquid Line Measured: 103degF
4deg Subcooling

So, how would I plot this data on an R-22 Pressure-Enthalpy diagram?

Thanks!

2. Professional Member*
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## Check National refrigerants web site

I think they have some useful info there. Once you can plot 22 you can do the same for any other refigerant

http://www.refrigerants.com/ReferenceGuide2006.pdf

3. Originally Posted by hvacClayton
Hello! I am an HVAC student in Wichita, KS. Yesterday, our instructor was teaching us how to plot on Pressure-Enthalpy charts also called Pressure-heat charts or Mollier Diagrams. Unfortunately he really did a bad job of showing us how to do it, and we all left class confused. I was wondering if someone could provide some good links or information to help me understand how to plot my data on the chart.

We were working with R-22 and these are my readings. Keep in mind, the trainer machines we have are nearly 20 years old and have been abused over the years.

Low Side:
72 PSIG = 42degF
Suction Line Measured: 59degF
17deg Superheat

High Side:
220 PSIG = 107degF
Liquid Line Measured: 103degF
4deg Subcooling

So, how would I plot this data on an R-22 Pressure-Enthalpy diagram?

Thanks!

you could try this , scroll to the bottom and click on "contents" youll find your answer there.

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