Last month, I talked
specifically about ASHRAE Guideline 0-2005, The Commissioning
Process and its owner’s project requirements document. As
quoted from the Guideline, the ASHRAE document “is
not definitive, but encompasses areas where there may be a variety of
approaches, none of which must be precisely correct.” I’d like to explore that
a bit more this month. How much latitude is there in the term “commissioning”
for new construction? If there are no approaches that are “precisely correct,”
are there any approaches that should be considered incorrect?
just completed reports for two retrocommissioning studies for different
building owners. An interesting - and potentially puzzling - similarity between
them was that they were both for relatively new buildings. One building had been completed just
one year before the owner decided retrocommissioning would be a good idea. The
other was a 4-yr-old building. Both were larger than 100,000 sq ft.
Deferred testing is performing FPT after substantial completion. Whereas systems performance testing should occur prior to the owner accepting the systems from the contractors, there are some instances where testing at the end of construction is either impractical or not meaningful.
In my October and November columns, I explored the complexities associated with motivating contractors to install, start up, and test new building systems as required to have the commissioning testing and demonstration be successful the first time. If there is an incentive for deficiency-free test results, the commissioning professional needs to be wary of the contractors wanting to stop and “fix” deficiencies during the testing process.
In September's column, we focused on the need to motivate project teams to correct systems performance deficiencies in a timely fashion follow-ing unsuccessful FPTs. This month, I'd like to explore the question of why there are unsuccessful FPTs in the first place.
Many engineers tend to avoid or delegate the nitty gritty of a ground source heat pump system, from soil moisture effects to building system (im) balance. It's time for designers to get in the loop. Learn more about Grounded In Reality in the December issue. Other topics in the December issue include health care HVAC, Boilders, check out the Back2Basics, and more.