Engineered Systems - April 2008 - (Page 73)

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 ™ Matches AC System Output to Changing Loads, Maintains Comfortable Humidity Levels Most AC systems lack subtlety: they either run at full capacity or they’re off. Under low load conditions, most systems quickly cool the air and then shut down, allowing humidity to build. The APR Control lets AC systems operate at less than full capacity so they continue to dehumidify without overcooling. ■ April solution from page 12. Cooling Towers For retrofits or new DX systems to 100 tons ■ Ideal for makeup air and VAV systems ■ Fast, simple installation RAWAL DEVICES, INC TEL : 800 727 6447 FAX: 781 933 3306 sales @ rawal.com www.rawal.com FREE INFO: 135 w w w. esmag a zin e. c o m 73 http://www.rawal.com http://www.rawal.com http://www.esmagazine.com

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

Engineered Systems - April 2008 Contents Editor’s Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Energy Wiz HVACR Designer Tips This Time, Water Cooled Was All Wet Cleanroom Design In 10 Easy Steps It's Not The Heat, It's The Humidity Issues & Events Computers and Software Products Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - April 2008

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