Last month, this column addressed special considerations
for developing the owner’s project requirements/DID for projects that are
designed and constructed as a core and shell (C&S) by the developer with
customized tenant fit-out (TFO) of occupied spaces as they are leased.
Documenting the owner’s project requirements/design intent is valuable for any
project and is imperative for commissioned projects.
It is exciting to see that the benefits of commissioning are being realized by more and more commercial real estate developers and their tenants. A traditional speculative office building presents special challenges for the commissioning process. In the commercial real estate market, many office buildings are constructed as a core and shell (C&S) by the developer with customized tenant fit-out (TFO) of occupied spaces as they are leased.
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.
Retrieving every last bit of performance from the system while stopping short of the surge line is no small feat. Dig into sizing, tower selection, chilled water loads and stability, and condenser water management to leave no efficiency stone unturned. Read more in April issue