Randy Wilkinson's HVAC Engineering Software

Me sending my first email message around 1960.

Disclaimer:
All programs here are original programs authored by me, unless otherwise noted. You may use them if you wish, but I do not assume any responsibility or liability for their use. I have made every effort to produce accurate calculations and valid assumptions, but you still must use your own judgement as to whether the answers given are acceptable.

All these programs use english units, unless otherwise noted.

Psychrometric Functionsfor microsoft Excel 5.0 or higher, psychro07.zip, 28kb

A library of Visual Basic functions written especially for Excel to calculate properties of moist air. ZIP file contains library of functions and Sample XLS files showing state point calculations, mixing problems and a simple psychrometric chart.
Updated: 05JAN07 - Bugfix: Works at temps below freezing now.

Psychrometric Functionsfor microsoft Excel 5.0 or higher,	psychro07.zip, 28kb
A library of Visual Basic functions written especially for Excel to calculate properties of moist air. ZIP file contains library of functions and Sample XLS files showing state point calculations, mixing problems and a simple psychrometric chart. Updated: 05JAN07 - Bugfix: Works at temps below freezing now.

Building Heating Loadfor microsoft Excel 5.0 or higher, heatonly.zip, 4.7kb

This is a simple spreadsheet to calculate approximate heating loads for a single zone. I do not have any cooling load calculation software.

Building Heating Loadfor microsoft Excel 5.0 or higher,	heatonly.zip, 4.7kb
This is a simple spreadsheet to calculate approximate heating loads for a single zone. I do not have any cooling load calculation software.

Windows Duct Sizing Program ductsize.zip, 5kb

A windows application for sizing new heating and air conditioning ducts. Uses slider bars for input. Useful mainly for sizing new ducts, but can be used to calculate pressure drop through simple systems. Written with Visual Basic 3.0 and therefore requires VBRUN300.DLL in your WINDOWS\SYSTEM directory (available from microsoft). Look at a screen capture

Windows Duct Sizing Program	ductsize.zip, 5kb
A windows application for sizing new heating and air conditioning ducts. Uses slider bars for input. Useful mainly for sizing new ducts, but can be used to calculate pressure drop through simple systems. Written with Visual Basic 3.0 and therefore requires VBRUN300.DLL in your WINDOWS\SYSTEM directory (available from microsoft). Look at a screen capture

DOS Duct Sizing Calculator duct_dos.zip, 49kb

A stand alone DOS program for sizing new heating and air conditioning ducts. Imagine an RPN calculator customized for sizing ducts. Customizable, mouse aware, runs on minimum hardware. Full documentation included. I wrote this one in 1989 using QuickBASIC.

DOS Duct Sizing Calculator	duct_dos.zip, 49kb
A stand alone DOS program for sizing new heating and air conditioning ducts. Imagine an RPN calculator customized for sizing ducts. Customizable, mouse aware, runs on minimum hardware. Full documentation included. I wrote this one in 1989 using QuickBASIC.

Windows Pipe Sizing Program pipesize.zip, 9kb

A windows application for sizing new HVAC and plumbing (pressurized) pipes. Uses slider bars for input. Useful mainly for sizing new pipes, but can be used to calculate pressure drop through simple systems. Written with Visual Basic 3.0 and therefore requires VBRUN300.DLL in your WINDOWS\SYSTEM directory (available from microsoft).

Windows Pipe Sizing Program	pipesize.zip, 9kb
A windows application for sizing new HVAC and plumbing (pressurized) pipes. Uses slider bars for input. Useful mainly for sizing new pipes, but can be used to calculate pressure drop through simple systems. Written with Visual Basic 3.0 and therefore requires VBRUN300.DLL in your WINDOWS\SYSTEM directory (available from microsoft).

Due to complexity, I do not have any cooling load calculation software.

Other good HVAC related software dept.

If you have an HP-48 calculator I would highly recommend:

PSYCH121.ZIP by James Weisbin

This is a psychrometric analysis program written in HP-48 system RPL. It's very fast and will determine properties of moist air for a single state point and solve mixing problems. Works for HP-48SX and GX and handles both SI and english units.

PSYCH121.ZIP	by James Weisbin
This is a psychrometric analysis program written in HP-48 system RPL. It's very fast and will determine properties of moist air for a single state point and solve mixing problems. Works for HP-48SX and GX and handles both SI and english units.

I DO appreciate your messages if you have taken my software and find it useful, but...
Please do not email me asking about HVAC system recommendations or advice. I do this for a living and do not have time to answer your questions for free.

Back to Main Page

Updated: January, 2017
Email:

send inquiries to w4lks@hvacware.net