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        Ground Loop Heat Exchanger Design Software


GLHEPRO is used for designing ground loop heat exchangers for use with ground source heat pump systems.  It is sold by the International Ground Source Heat Pump Association.


        Load Calculation Software

Periodic Response Factor Generator
This CTF/PRF Generator calculates conduction transfer functions and periodic response factors required by ASHRAE’s heat balance and radiant time series load calculation methods. This program is suitable for Windows 95/98/ME/NT/2000/XP systems. Download the file (14.5Mb) and unzip the contents to a temporary folder. Run the Setup.exe program and follow the instructions to install.  Questions about the program should be addressed to Calvin Iu.

Radiant Time Series Spreadsheet                                         Dr. Spitler gave 2 presentations to the Montreal Chapter of ASHRAE on October 6, 2003.  The two presentations and the spreadsheet are below.

-Overview of the Radiant Time Series Method

-Limitations of Simplified Load Calculation Procedures

-RTS Excel Spreadsheet


Psychrometric Software

Psychrometric Calculator (SI Units)
The Psychrometric Calculator is used to compute the thermodynamic properties of moist air. These properties are used by mechanical engineers to design Heating Ventilating & Air Conditioning (HVAC) systems and processes. The program is based on the procedure outlined in the 1997 ASHRAE Fundamentals Handbook.

For systems running Windows 95/98/ME/NT/2000/XP, it is available with and without the JAVA Virtual Machine, if you have the JVM installed download psychro.exe(2,191KB). If you don’t have the JVM installed, download psychro.exe(8,126KB).

Systems running UNIX/Linux platforms, download psychro.jar(1,957KB) and type java -jar psychro.jar to run the application. Questions about the program should be addressed to Muhammad Haider Khan.


Current and Recent Sponsors

  American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.   U.S. Department of Energy
The Chartered Institution of Building Service Engineers     Federal Highways Administration
Oklahoma Center for the Advancement of Science & Technology Oklahoma Department of Transportation
  AAON, Inc.   Johnson Controls, Inc.
  Specific Systems    


Research Collaborators

    Charles S. Barnaby
 Wrightsoft Corporation 
    Mike Holmes
Ove Arup and Partners

Göran Hellström
Department of Mathematical Physics




A.J. van Gelder
Henk Witte


Simon Rees

   Morris Davies
Phil Haves
Lawrence Berkeley National Lab

Chris Underwood


Richard Strand
University of Illinois at Urbana-Champaign
Signhild Gehlin 



Professional Societies


American Society of Heating, Refrigeration, and  Air-Conditioning Engineers, Inc.


IBPSA-International Building Performance Simulation Association


The International Institute of Refrigeration (IIR)


International Ground Source Heat Pump  Association


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