Articles by Rebecca Thatcher Ellis, P.E.

COMMISSIONING

Commissioning Action Lists: Keeping Them Under Control, Part 1

Schedules can get out of control for several reasons. What’s to be done to prevent or minimize the fallout?
Last month, this column introduced the concept of an “excessively long” commissioning action list (CAL).
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COMMISSIONING

Commissioning Action Lists: What Is Too Long?

A lengthy to-do list after FPT can cause more problems than it solves.
I am a strong proponent of planning ahead for successful functional performance testing.
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COMMISSIONING

Beware Of Single-Mode Balancing Reports

System success depends on a well-rounded TAB procedure.
Proper air and water balancing is critical to HVAC system performance.
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COMMISSIONING

An Appropriate Level Of Effort

A tricky RFP question gets trickier when the “correct” answer might depend on the particular owner.
The following is a question posed in a recent Request for Proposal (RFP) for commissioning services.
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Commissioning

Designer Copy/Paste

Don’t let this all too common practice create confusing specifications.
In December 2013, this Commissioning column addressed the challenges posed by controls contractors who “cut and paste” the design engineer’s sequences of operation into the controls submittal.
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Commissioning

Just Because You Can, Doesn’t Mean You Should

Complex HVAC systems only stand a chance when endusers have the interest and ability for a long-term commitment.
HVAC systems can do amazing things these days — things that were unthinkable even 20 years ago.
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Commissioning

Remote System Readiness Verification

As technology advances, the pre-functional checklist is becoming a thing of the past.
When I started building systems commissioning 25 years ago, it did not take long to figure out that more was needed to confirm that the commissioned systems were complete and ready for testing than just the general contractor’s word for it.
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Commissioning

Unsampled Systems

Choosing not to sample every system can be a gamble, but here are some ways to lower your risk.
Over the past two months, this column has addressed the issue of sampling systems for field functional performance testing
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Commissioning

Functional Performance Test Sampling

So you’ve decided on your sample size. What next? What happens when a system failure is found?
Last month, this column addressed the need for (and philosophy behind) sample testing certain systems when 100% functional performance testing (FPT) is impractical from a time and/or budget perspective.
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Commissioning

Functional Performance Test Sampling

Testing it all typically isn’t an option. How to determine what (and how many) to check?
In the standard commissioning process, there are two primary technical activities that occur on site at the end of construction and prior to systems acceptance by the owner.
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11/20/14 2:00 pm CDT

Key Issues in Selecting Emergency Back-up Generators

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Engineered Systems Magazine

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2014 October

Check out the October 2014 issue of Engineered Systems, with features on economizers, pump operations, and much more!

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