Engineered Systems - March 2008 - (Page 10)

Back 2 Basics Based on Cx-3 ATC/FPT software BY HOWARD MCKEW, P.E., C.P.E. Engi Eng neering n the Engineering in the Warranty Ph n Phase • The design engineer shou d continue to monitor the project during The h engineer should ee houl o project duri ect ec during i contractor the warranty phase by asking the HVAC service contract (who is e ract ractor t providing remote monitoring of space temperature, safeties, and alarms) to e-mail system trending data to confirm basis of design compliance, and then reporting back to the client. • The design engineer should make a point of calling the HVAC service contractor on a design day (heating season and cooling season) to confirm system performance, and then reporting back to the client. • When addressing energy management capabilities in the design phase, standard office specifications need to be enhanced to reflect today’s business tools. The design engineer needs to work closely with the client to determine what metering and control components are required for the associated HVAC service contractor to efficiently and effectively do his job. • The design engineer should also be copied on monthly utility bills to monitor energy consumption, especially if LEED® Measurement & Verification Plan credit is a goal. If energy simulation software is used in the design phase for determining the optimum system selection and/or for life cycle analysis, this month-by-month energy consumption data should be forwarded to the HVAC service contractor or the design engineer to be used to benchmark trending data during the warranty phase of the project. This simulation exercise can be used to confirm and obtain two to 10 LEED credit points based on computer output. • Like any quality process, data collection, and data analysis are the foundation of peak facility management as it relates to energy consumption, operating cost, and maximization of useful equipment service life. BAS trending, using graph presentations, can be invaluable to the building owner striving for an efficient HVAC system. A picture is worth a 1,000 words, and a BAS computer graph can be worth even more. • The design engineer should monitor the collection of O&M documents per the contract specification to ensure there will be a PM workorder system in place, with workorders being completed during the warranty phase. complete a “dry-run” FPT demonstration using the commissioning complete “dry-run” FPT d mple mplete dry-run” ydemonstration using the commissio nt s ommi io ommi io m ioning engineer-furnished FPT checklist and signoff of the results. engineer-furnish nginee - nished ie nish checklist and signoff heckl ckli n ignoff ignof resu esults. • Refer to Febr ary’s “B2B” discussion about operator handbooks. to February’s “B2B” discussion about operator handbooks brua br br r B2B 2 s io b o pa Once system demonstration is completed, each system should have a copy of the associated handbook posted at the equipment and/or located within equipment room. • The system flow diagram should include all actual-to-design pertinent flow and pressure, pressure drop, and temperature info as the system is being balanced by the TAB engineer. Once completed, and this flow diagram and TAB documentation is accepted by the design engineer, it should be laminated and placed within the operator’s handbook. • Whether the project is to be LEED-certified or not, a 10-month meeting should be held between the commissioning engineer, the TAB engineers, building owner, and the HVAC service contractor to review the commissioning process, corrective action log, owner’s project requirements, OPR, basis of design, warranty issues, trending data, and PM workorders. In addition, there should be a lessonslearned discussion for everyone’s benefit in preparation for future construction projects. Log on to www.buildingsmartsoftware.com for the complete Commissioning 1-2-3 process and also refer to “HVACR Designer Tips” for the equipment startup checklist and the “Application Checklist” for the system selection scorecard. “Back2Basics” is now available electronically and in CD-ROM format! To order an individual series or the entire collection of “Back2Basics,” go to www.esmagazine.com. Back 2 Basics The Back2Basics library has grown. grown Series 28 — 37 are now available. Or if you are missing a few series of “Back2Basics,” copies are available by contacting Jill DeVries at BNP Media, 248-244-1726 or by e-mail at devriesj@ bnpmedia.com. You can also order “Back2Basics” at www.esmagazine.com. Series 031-037 (Tests 182-202): . . $69.95 Series 001-008 (Tests 001-048): . . $59.95 Series 001-014 (Tests 001-084): . $104.95 Series 001-018 (Tests 001-108):. . $129.95 Series 001-030 (Tests 001-181):. . $209.95 Series 001-037 (Tests 001-202): . $269.95 Third-Party Commissioning and TAB Engineering in the Warranty Phase • The commissioning team during the warranty phase is the same team who participated in the construction phase. In the warranty phase, there will be a requirement for observing the deferred seasonal FPT demonstration (i.e., heating system demonstrated in the heating season). Pertinent trending data will be invaluable leading up to this deferred test demonstration. Trending can document that the system is functional as designed before the commissioning team arrives. If the trends show routine problems, the commissioning team should not waste time observing a system FPT demonstration if there are known problems that will result in a corrective action log, as a plagued system demonstration that will require re-testing. • Retesting should be avoided at all costs, due to the issue that will arise as to who will reimburse the commissioning teams for this additional service. To avoid this problem, insert, in Division 18000 commissioning specification, the requirement that the contractor 10 En gi neer ed S y stem s March 2008 http://www.buildingsmartsoftware.com http://www.esmagazine.com http://www.esmagazine.com

Table of Contents Feed for the Digital Edition of Engineered Systems - March 2008

Engineered Systems - March 2008 Contents Editor’s Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Energy Wiz HVACR Designer Tips Application Checklist Exemplary Design = Elementary Success The Modern Unit Ventilator On A Mission VAV Systems And Green Design – Part II Issues & Events Products Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - March 2008

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