Category Archives: Data Logging

These posts focus on data logging techniques and examples

Retrocommissioning Findings: Reducing Boiler Purge Cycle Losses–How I Obtained My Results

This post expands on what I did in the final section of the last post to show how I arrived at the answers I arrived at. Before proceeding, I want to emphasize that what I am about to show is … Continue reading

Posted in Boilers, Hot Water Systems, and Steam Systems, Data Logging, Excel Techniques, HVAC Calculations, Retrocommissioning Findings | Leave a comment

Retrocommissioning Findings: Reducing Boiler Purge Cycle Losses

Greetings after another break in the action in terms of my posting rate.  As those of you who follow this blog know, sometimes, I get pretty busy and since writing this is not exactly my “day job’, my posting rate … Continue reading

Posted in Data Logging, Excel Techniques, HVAC Calculations, HVAC Fundamentals, Operations and Maintenance, Retrocommissioning Findings | Leave a comment

Aliasing and Other Factors Affecting the Accuracy of Field Data

One of the challenges we face when we work with building systems is capturing enough sufficiently accurate data to paint a true picture of what is going on.  This is harder than it sounds for a number of reasons, including … Continue reading

Posted in Data Logging, Excel Techniques, Retrocommissioning Findings | Leave a comment

4-20 ma Current Loop Experiments – Thermal Mass Effects

In this post, I will look at how thermal mass impacts a temperature reading, as can be seen in this video clip where I apply heat to a sensor inside a well while letting you watch a meter displaying the … Continue reading

Posted in 4-20 ma Current Loops, Controls, Data Logging | Leave a comment

HVAC Field Tools: Measuring Air Pressure and Flow

This post was inspired by a question a student asked the other day in class.  I meant to answer during a break and then ran out of time.  So, I thought I would answer it here in case it was … Continue reading

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Retrocommissioning Findings: Make Up Air Handling System Simultaneous Heating and Cooling – Data Logging and Testing

This post picks up where I left off in the string of posts I started about a make up air handling system that was simultaneously heating and cooling when it didn’t need to.   And, since I finally figured out how … Continue reading

Posted in Data Logging, Retrocommissioning Findings | 2 Comments

Data Logger Duration Times

One of the more popular posts I have done, based on the WordPress statistics, is the string that starts with a post titled Assessing Steam Consumption with an Alarm Clock where-in a share a technique Chuck McClure (a mentor and … Continue reading

Posted in Data Logging | 3 Comments