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Articles by Rebecca Thatcher Ellis, P.E.

Single-Zone AHU Trend Analysis – Cooling

How would you know if you were getting the right result via the wrong sequence of events?
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Single-Zone AHU Trend Analysis

On to a new case after solving a museum mystery …
In this column, I will describe the “issue” disclosed through analysis of the trend graph included in my January 2012 column. I will also introduce a new system and show its trend graph, leaving it up to the reader to discover the operational “issue” illustrated in the graph. The answer will be given at the start of next month’s column.
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Public Art Gallery AHU Trend Analysis

The $4,000/yr problem was not on display for, or even noticeable by, visitors and staff.
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Art StorageVault AHU Trend Analysis

What secret is this dark vault hiding?
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Critical Air-Handling System Trend Analysis

This is the second in a series of columns in which I am demonstrating examples of systems performance information that can be gleaned from trend log analysis. In these columns, I introduce a system or sub-system, show a trend graph, and then leave it up to the reader to discover the operational “issue” illustrated in the graph. The answer will be given at the start of the subsequent month’s column.
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PARKING GARAGE MAKEUP AIR — Heating Trend Analysis

This is the first in a series of columns in which I plan to demonstrate examples of systems performance information that can be gleaned from trend log analysis. Whether the trended data comes from a BAS or from portable dataloggers, the analysis is the same.
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Commissioning: TREND Logs- Worth the effort?

Using data trend logs to supplement in-field functional performance testing (FPT) has always been an option in the commissioning process, particularly for HVAC systems controlled by DDC systems. As DDC system trending capabilities and computer hardware storage capacities have improved substantially over the past few years, I propose that trend logs be given a more prominent place in the commissioning toolbox.
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Commissioning: Equipment Startup And Commissioning

The once fairly calm phase could now be a key to nipping integration issues in the bud.
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Commissioning: Equipment And Controls Integration

We still face plenty of ways for start-up to be a let down.
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Commissioning: WHAT IS Accessible?

As noted in last month’s column, accessibility to mechanical, electrical, and control system components is critical for sustainable systems operation. However, the design and construction industry is sorely lacking when it comes to agreeing on what appropriate accessibility means. In order to make a meaningful difference in how systems are delivered to owners/operators, it is critical to define measurable accessibility acceptance criteria early in the design phase and allow the commissioning professional to shepherd that criteria through the design, construction, and acceptance phases.
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