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  1. #1

    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. #2
    Join Date
    Jun 2010
    Location
    Philadelphia PA
    Posts
    2,198

    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
    You have got to learn from other people's mistakes! Because God knows you don't live long enough to make them all yourself !!!!!!!!

  3. #3
    Join Date
    Jan 2011
    Location
    greenville , sc
    Posts
    718
    Quote Originally Posted by hvacClayton View Post
    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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