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    • Bureaucratic Affairs Building HHW System Logic Exercise
    • Bureaucratic Affairs Building Scavenger Hunt
    • Chilled Water Plant System Diagram Exercise
    • The HIjend Hotel >
      • Chilled Water Plant Scoping Exercise
      • Ballroom AHU Scoping Exercise
      • Cooling Tower Scoping Exercise
  • Tools
    • Altitude Correction Factor
    • Economizer Evaluation Checklist
    • Eikon for Educators and WindLGC
    • Effective Duct Length Tool
    • Excel Third Axis Tool
    • Excel Time Value Conversion
    • Insulation Savings Tools
    • Logic Diagram Tool
    • Mixed Air Calculations
    • Monitoring Plan Spreadsheet
    • Pipe Friction Chart
    • Plot Digitizer >
      • Plot Digitizer Pump Curve Example
    • Square Law Spreadsheet
    • System Diagram Symbols
    • Thermodynamic Diagrams Spreadsheet
    • Universal Translator Data Analysis Tool
    • y = (m * x) + b Spreadsheet
  • Useful Formulas
    • Affinity Laws
    • Circular Equivalent Duct
    • Effective Duct Length
    • FT Guide Appendix C
    • HVAC Equations and Concepts
    • Hydraulic Diameter
    • Pump Power and Energy
    • "Square Law"
  • What's That Thing?
    • Cooling Towers
    • Pumps
    • Valves
  • Resources
    • Bill Coad's Writings
    • Data Logging Resources
    • EBCx Skills Guidebook
    • Energy Design Resources
    • Fisher Controls Valve Cavitation Bulletin
    • Functional Testing Guide
    • Honeywell Gray Manual
    • MCC Powers Bulletins
    • NBCIP Reports
    • PEC Tool Lending Library
    • PID Resources
    • Pneumatic Control Resources
    • Resource List
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    • TAB Resources
    • Vintage Carrier Design Manual
    • VRF Systems
    • Williams' Wisdom
  • Videos
    • Bureaucratic Affairs HHW Logic Answers
    • Cooling Tower Flow Variation
    • Economizer Stratification
    • Functional Testing
    • Induction Principles
    • Monitoring Plans
    • Ripple Effects
    • Testing a Pump
    • The Garden of Low Entropy
    • Variable Flow Systems
  • Training
    • Materials from Classes and Presentations >
      • ACEEE
      • ASHRAE
      • ASHRAE - Engineers Notebook
      • BCxA and NCBC
      • BEST Institute
      • Case Studies
      • ERDC 2020 RCx Academy
      • ELPNW
      • ICEBO
      • Marriott AEP
      • Magazine Articles
      • NAVFAC
      • Pacific Energy Center Design, Performance and Commissioning Issues Classes >
        • PEC Class Materials Archive
      • Pacific Energy Center EBCx Project Review
      • Pacific Energy Center EBCx Workshop Series >
        • EBCx Workshop Series 12
        • EBCx Workshop Series 13
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        • EBCx Workshop Series 15 >
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        • EBCx Workshop Series 16
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      • Portland General Electric
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      • Introduction to Functional Testing
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Thermodynamic Diagrams Spreadsheet

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​Thermodynamic diagrams are very useful tools for folks working in the HVAC industry.  The psychrometric chart is probably the most common.   But if you find yourself working with steam, the pressure enthalpy diagram for water, the pressure-enthalpy diagram illustrated below, or the temperature-entropy diagram illustrated to the left, or the entropy-enthalpy diagram (or Mollier diagram) illustrated below that can also be useful.
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Of course, these diagrams can be quite intimidating at first.

One of the ways to become comfortable with them is to start working with them or looking at examples of working with them like the ones you will find in this blog post or in this application engineering guide from Sporlan that looks at working with the pressure enthalpy diagram for a refrigerant.

I personally learned a lot and gained some comfort from plotting my own versions of the diagrams for steam, which are what I have used here to illustrate with and a p-h diagram for Refrigerant 134a.  Facilitating that process was an application called REFPROP, developed by NIST (the National Institute of Standards). 

This link will take you to a blog post that tells you more about it and how to get a copy, including a free student version that will allow you to make your own charts for
water, CO2, R134a, nitrogen, methane, propane, hydrogen, and dodecane (a possible alternative to jet fuel).

I have also included the spreadsheet I used to make the charts shown here and a p-h diagram for R-134a if you want to download them and reverse engineer some of the Excel techniques I used to create them.
water_vweb.xlsx
File Size: 3401 kb
File Type: xlsx
Download File

r134a_vweb.xlsx
File Size: 1937 kb
File Type: xlsx
Download File

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