Author Archives: David Sellers

A Steam Heating Resources

I recently helped to present a class titled Steam and Hot Water Systems;  Design, Performance, and Commissioning Issues;  one in a series of classes I am involved with at the Pacific Energy Center.  Ryan and I have been trying to … Continue reading

Posted in Boilers, Hot Water Systems, and Steam Systems, Resource List and other Resources | Leave a comment

Site versus Source Energy

Author’s Note:  I originally posted this in September of 2007 and used a report I had found at that time to develop some of the source energy factors I used in my illustration.   Since then, I have found a number … Continue reading

Posted in HVAC Calculations, HVAC Fundamentals, Resource List and other Resources | 2 Comments

Condenser Water Systems, Air Entrainment, and Pump Cavitation

This post is the result of a discussion I was having as the result of a comment made on a previous post about commissioning a condenser water system.  The initial question was to ask if the solution I had suggested … Continue reading

Posted in Chillers and Chilled Water Systems, Operations and Maintenance, Retrocommissioning Findings, System Diagrams | Tagged , , | Leave a comment

A New Commissioning Resource Website

For a while now, I have had this idea for a commissioning resource website floating around in the back of my head.  It seemed like there would be things that I could do with the way a website is organized … Continue reading

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Learning about Relay Logic; What’s a Relay?

Author’s Note:  I edited this to put in pictures with better contrast for the relay images further down the post and for some reason, instead of just replacing the original post, the system put it up as a new post.   … Continue reading

Posted in Controls | Leave a comment

The Other Side of Life

I really enjoy working on this blog because the technical things I discuss are of interest to me and by sharing what I know, I am sharing what my mentors have shared with me, sort of playing it forward I … Continue reading

Posted in Uncategorized | Leave a comment

Hourly Weather Data Website Update

Frequently, when operating buildings or doing energy calculations for their systems, it is very handy to be able to obtain hourly weather data for a given location.   That is why I think the post I did a while back on … Continue reading

Posted in Weather and Climate Interactions with Buildings and Systems, Weather and Climate Resources | Leave a comment