Engineered Systems - February 2008 - (Page 70) Glossary Here are some common abbreviations and terms found in the pages of Engineered Systems. A A/C – air conditioning ach – air changes per hour AE – architectural and engineering; or architect and engineer AFD – adjustable-frequency drive AHJ – authority having jurisdiction AHU– air-handling unit ASD – adjustable-speed drive ASHRAE – American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ATC – automatic temperature control F fpm – feet per minute FPT – functional performance test R rh – relative humidity RFP – request for proposal RFS – request for submittal ROI – return on investment RO – reverse osmosis RTD – resistance temperature detector G gpm – gallons per minute H HEPA – high-efficiency particulate air HTML – hypertext markup language HTTP – hypertext transfer protocol HWR – hot water return HWS – hot water supply S scfm – standard cubic feet per minute B BACnet – a data communication protocol for building automation and control networks BAS – building automation system bhp – boiler horsepower; also, brake horsepower BMS – building management system T TAB – testing and balancing TES – thermal energy storage I IAQ – indoor air quality IS – information systems IT – information technology U UL – Underwriter's Laboratory USGBC – U.S. Green Building Council UV – ultraviolet C CAD – computer-aided design cfm – cubic feet per minute CHW – chilled water CMMS – computerized maintenance management system CO2– carbon dioxide COP – coefficient of performance L LAN – local area network LEED® – Leadership in Energy and Environmental Design, a designation by the U.S. Green Building Council V VAV – variable-air volume VFD – variable-frequency drive VOIP – voice-over Internet protocol VSD – variable-speed drive M MEC – mechanical, electrical, communication MEP – mechanical, electrical, plumbing MERV – minimum efficiency rating value D D-B – design-build db – drybulb DDC – direct digital controls DID – design intent document DOAS – dedicated outdoor air system DOE – U.S. Department of Energy DX – direct expansion X XML – extensible markup language O O&M – operations and maintenance oBIX – Open Building Information Exchange OEM – original equipment manufacturer OA – outside air W WAN – wide area network wb – wetbulb wc – water column wg – water gauge E EMS – energy management system EPA – U.S. Environmental Protection Agency ERV – energy recovery ventilator P PFPT – prefunctional performance test PM – preventive maintenance PID – proportional, integral, derivative Take the HVAC CHALLENGE ™ February solution from page 12. Boilers Considering a career move? Wondering what’s out there? Checking out the engineering market just got easier. Visit www.ESmagazine.com today to search job listings, browse resources or to find s or nd prospective employees. More than 50,000 engineering g positions are listed right now! 70 En gi neer ed Sy stem s February 2008 http://www.ESmagazine.com http://www.ESmagazine.com http://www.ESmagazine.com
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