Category Archives: Air Handling Systems

These posts focus on retrocommissioning findings for air handling systems

The AMCA ASET-US Conference and Mentoring

Earlier this year, I was asked to be the plenary speaker at the upcoming AMCA ASET Conference in San Antonio, Texas. As many of you probably know, AMCA is the Air Movement and Control Association International and their mission is … Continue reading

Posted in Air Handling Systems, Mentoring and Teaching | Leave a comment

Howden North America’s Fan Engineering Handbook

Authors Note:  So, some good news on this.  For a while, some of the links below did not work and I could not get information back from Howden regarding how to get a copy of the handbook since my contacts … Continue reading

Posted in Air Handling Systems, Resource List and other Resources | 2 Comments

A Free Electronic Psych Chart and How to Use It to Plot Basic HVAC Processes

Ryan Stroupe of the Pacific Energy Center recently worked out a deal that allows him to provide a free limited capability version of Hands Down Software’s electronic psych chart.  You can get a copy at this link and a overview … Continue reading

Posted in Air Handling Systems, Economizers, Excel Techniques, HVAC Calculations, HVAC Fundamentals, Psychrometrics, Resource List and other Resources, Weather and Climate Interactions with Buildings and Systems | 1 Comment

Economizers–The Physics of Linkage Systems

In the post before the previous, I was discussing an economizer performance problem in a facility we worked with as a class in Monterey California.  One of the problems was related to the mechanics of motion in the linkage system … Continue reading

Posted in Air Handling Systems, Controls, Economizers, Pneumatic Controls | Leave a comment

Economizers–The Physics of a Mixed Air Plenum

I’ve been working on a post that shows how a scatter plot technique can be used to assess the performance of an HVAC airside economizer.  It’s based on comparing a plot of outdoor air temperature vs. mixed air temperature for … Continue reading

Posted in Air Handling Systems, Controls, Economizers, HVAC Calculations, HVAC Fundamentals, Psychrometrics | Leave a comment

Retrocommissioning Findings: Scoping a Dental Clinic VAV Reheat System–Part 1

I’m currently involved with a number of field oriented classes in which the instructors mentor the students through a retrocommissioning process on a system in an existing building in real time.  Based on past experience with this process, I have … Continue reading

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System Effect–Dealing with the Point Where the Fan Meets the Duct

I am going to take a break from my string on building a psych chart to do a post on System Effect in support of one of the classes Ryan Stroupe and I teach at the Pacific Energy Center.   If … Continue reading

Posted in Air Handling Systems | 1 Comment