ASHRAE Journal - November 2014 - 26
TECHNICAL FEATURE
Technical vs. Process Commissioning
Ongoing Commissioning
BY DAVE MCFARLANE, MEMBER ASHRAE; AND SCOTT GORDON, ASSOCIATE MEMBER ASHRAE
The previous eight articles in this series provided a framework to commission new
projects starting with helping the owner develop an owner's project requirement
(OPR) document, reviewing the design, the construction process through field installation verifications (FIV), operational performance tests (OPT) and the final functional performance tests to prove the building is working. We have a great project. The
owners and contractors are both happy. Everyone sees the benefits:
* Increased comfort, fewer occupancy temperature
complaints;
* Fewer service/trouble calls from building systems,
improved reliability;
* Reduced energy costs;
* Better trained operations and maintenance staff;
and
* Enhanced building and system(s) documentation.
At the point where everyone is patting themselves on
the back for a job well done, the owner makes the comment. "OK, we have a great building, and it's working
as intended. We're all happy campers. What do we do
to keep the building in this brand new condition and
operating properly?"
This is the last in a series of articles that explain the technical commissioning process for new buildings.
Some of these articles' content is derived from ASHRAE Guideline 0-2005, The Commissioning Process
(published 2005) and the National Environmental Balancing Bureau (NEBB) publication Procedural Standards for Whole Building Systems Technical Commissioning for New Construction (revised April 2013).
The answer to that question is the rationale for
this article. The industry calls this process ongoing
commissioning.
An ongoing commissioning (OCx) program provides
the framework to maintain the persistence of building
performance over the life of the facility, while providing a method to continually improve building performance. Without an OCx program, building performance
degrades over time. Performance degradation inevitably
occurs due to slippage in performance at the component, equipment, subsystem and system level. "Most
buildings will lose up to 30% of their energy efficiency
in the first three years of operation" (based upon a Texas
A&M study).
Degradation is due to a multitude of possible faults:
manual overrides of reset schedules, leaking control
valves, inoperable economizers and deferred maintenance issues. Even when a building is set up and
operating efficiently when originally constructed or
Dave McFarlane is a principal project director in the asset management practice and head of the retro-commissioning group and Scott Gordon is technical manager for the Building
Performance Group at Atkins in Fort Myers, Fla.
26
ASHRAE JOURNAL
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ASHRAE Journal - November 2014
Table of Contents for the Digital Edition of ASHRAE Journal - November 2014
Contents
ASHRAE Journal - November 2014 - Cover1
ASHRAE Journal - November 2014 - Cover2
ASHRAE Journal - November 2014 - 1
ASHRAE Journal - November 2014 - 2
ASHRAE Journal - November 2014 - Contents
ASHRAE Journal - November 2014 - 4
ASHRAE Journal - November 2014 - 5
ASHRAE Journal - November 2014 - 6
ASHRAE Journal - November 2014 - 7
ASHRAE Journal - November 2014 - 8
ASHRAE Journal - November 2014 - 9
ASHRAE Journal - November 2014 - 10
ASHRAE Journal - November 2014 - 11
ASHRAE Journal - November 2014 - 12
ASHRAE Journal - November 2014 - 13
ASHRAE Journal - November 2014 - 14
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ASHRAE Journal - November 2014 - 17
ASHRAE Journal - November 2014 - 18
ASHRAE Journal - November 2014 - 19
ASHRAE Journal - November 2014 - 20
ASHRAE Journal - November 2014 - 21
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ASHRAE Journal - November 2014 - 24
ASHRAE Journal - November 2014 - 25
ASHRAE Journal - November 2014 - 26
ASHRAE Journal - November 2014 - 27
ASHRAE Journal - November 2014 - 28
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ASHRAE Journal - November 2014 - Cover3
ASHRAE Journal - November 2014 - Cover4
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