APP-CMC058-EN_Economizer-performance_cover.ai 1 1/20/2016 4:18:14 PM Trane Engineers Newsletter Live Delivering Performance from Airside Economizers Presenters: John Murphy, Eric Sturm and Jeanne Harshaw (host) APP-CMC058_agenda.ai 1 1/20/2016 4:25:30 PM Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers Agenda Trane Engineers Newsletter Live Series Delivering Performance from Airside Economizers Abstract Airside economizers are an effective way to save energy and operational cost in many unitary and air handling systems. In some instances, the promise of energy savings hasn’t been fully realized. This ENL will discuss the current energy code requirements related to economizers, how economizers can be used to save energy, common problems, and how modern design and technology can be used to ensure that the expected energy savings are realized. Presenters: Trane engineers John Murphy and Eric Sturm After viewing attendees will be able to: 1. Summarize airside economizer energy code and standard requirements. 2. Identify common issues that affect correct and reliable economizer operation. 3. Incorporate new technologies (e.g. fault detection and damper design) to maximize the energy benefit of economizers. 4. Summarize how to use economizers in different types of equipment. Agenda • What are airside economizers? • Energy code and standards requirements • How can economizers save energy? • Comon problems with economizers • Situational issues • How to implement economizers in different equipment types ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 1 APP-CMC058_Bios_economizers.ai 1 1/20/2016 4:26:06 PM Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers Presenter biographies Delivering Performance from Airside Economizers John Murphy | applications engineer | Trane John has been with Trane since 1993. His primary responsibility as an applications engineer is to aid design engineers and Trane sales personnel in the proper design and application of HVAC systems. His main areas of expertise include energy efficiency, dehumidification, dedicated outdoor-air systems, air-to-air energy recovery, psychrometry, airside system control and ventilation. He is also a LEED Accredited Professional. John is the author of numerous Trane application manuals and Engineers Newsletters, and is a frequent presenter on Trane’s Engineers Newsletter Live series. He has authored several articles for the ASHRAE Journal, and was twice awarded “Article of the Year” award. He is an ASHRAE Fellow and has served on the “Moisture Management in Buildings” and “Mechanical Dehumidifiers” technical committees. He was a contributing author of the Advanced Energy Design Guide for K-12 Schools and the Advanced Energy Design Guide for Small Hospitals and Health Care Facilities, a technical reviewer for the ASHRAE Guide for Buildings in Hot and Humid Climates, and a presenter on the 2012 ASHRAE “Dedicated Outdoor Air Systems” webcast. Eric Sturm | applications engineer | Trane Eric joined Trane in 2006 after graduating from the University of Wisconsin – Platteville with a Bachelor of Science degree in mechanical engineering. Prior to joining the applications engineering team, he worked in the Customer Direct Services (C.D.S.) department as a marketing engineer and product manager for the TRACE™ 700 load design and energy simulation software application. As a C.D.S. marketing engineer he supported and trained customers globally. In his current role as an applications engineer, Eric’s areas of expertise include acoustics, airside systems, and standards and codes. Eric is currently involved with ASHRAE at the local chapter as president-elect and nationally as member of the “Global Climate Change” and “Sound and Vibration” technical committees. In 2015, Eric was named recipient of the Young Engineers in ASHRAE Award of Individual Excellence for service to the la Crosse Area Chapter of ASHRAE. ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 2 Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers Delivering Performance From Airside Economizers Trane Engineers Newsletter Live Series “Trane” is a Registered Provider with The American Institute of Architects Continuing Education System. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion are available on request. This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Credit for viewing today’s program can be applied toward LEED credential maintenance requirements . www.USGBC.org Visit the Registered Continuing Education Programs (RCEP) Website for individual state continuing education requirements for Professional Engineers. www.RCEP.net ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 3 Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers Copyrighted Materials This presentation is protected by U.S. and international copyright laws. Reproduction, distribution, display, and use of the presentation without written permission of Trane is prohibited. © 2016 Trane, a business of Ingersoll Rand. All rights reserved. Learning objectives • Summarize airside economizer energy code and standard requirements. • Identify common issues that affect correct and reliable economizer operation. • Incorporate new technologies (e.g. fault detection and damper design) to maximize the energy benefit of economizers. • Summarize how to use economizer control types in different climates. • Apply economizers in different system types. ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 4 Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers AGENDA • What is an airside economizer? • Energy standard and code requirements • How economizers can save energy • Common problems with economizers • Situational issues • Summary Today’s Presenters John Murphy Eric Sturm Applications Engineer Applications Engineer ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 5 Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers AGENDA • What is an airside economizer? • Energy standard and code requirements • How economizers can save energy • Common problems with economizers • Situational issues • Summary definition Air Economizer “A duct and damper arrangement, and automatic control system, that together allow a cooling system to supply outdoor air to reduce or eliminate the need for mechanical cooling during mild or cold weather.” ANSI/ASHRAE/IES Standard 90.1-2013 (Section 3) ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 6 Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers OA MA ON ON RA SA OA OFF OFF EA RA SA ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 7 Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers OA MA 180 OFF OFF 160 air of dry ratio, grains/lb humidity RA SA 140 system in HEATING 120 100 80 60 OA damper at minimum 40 position 20 10 20 30 40 50 60 70 8090 100 110 dry-bulb temperature, °F modulated economizer mode: OA and RA dampers modulating OA to provide cooling needed, while MA compressors are off 180 OFF OFF EA 160 air of dry ratio, grains/lb humidity RA SA 140 system in COOLING 120 100 OA damper modulating 80 further open 60 40 20 10 20 30 40 50 60 70 8090 100 110 dry-bulb temperature, °F ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 8 Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers integrated economizer mode: OA damper fully open, while OA compressors provide balance MA of cooling needed 180 ON OFF EA 160 air of dry ratio, grains/lb humidity RA SA 140 system in COOLING OA damper 120 fully open 100 80 60 40 current 20 supply-air temperature 10 20 30 40 50 60 70 8090 100 110 dry-bulb temperature, °F OA MA OA damper at 180 ON ON minimum position 160 air of dry ratio, grains/lb humidity RA SA 140 system in COOLING 120 100 80 60 40 20 high-limit shutoff setpoint 10 20 30 40 50 60 70 8090 100 110 dry-bulb temperature, °F ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 9 Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers high-limit shutoff control Fixed Dry Bulb 180 160 air of dry ratio, grains/lb humidity 140 120 economizer disabled 100 whenever 80 DBTOA > setpoint High-limit shutoff setpoint 60 varies based on climate 40 20 high-limit shutoff setpoint 30 40 50 60 70 8090 100 110 dry-bulb temperature, °F high-limit shutoff control Differential Dry Bulb 180 160 air of dry ratio, grains/lb humidity 140 economizer disabled 120 whenever DBTOA > DBTRA 100 High-limit shutoff setpoint 80 RA is the current measured 60 return air dry-bulb temperature 40 20 current return-air dry-bulb temperature 30 40 50 60 70 8090 100 110 dry-bulb temperature, °F ©2016 Trane a business of Ingersoll Rand Trane No. APP-CMC058-EN 10 Trane Engineers Newsletter LIVE Series Delivering Performance from Airside Economizers high-limit shutoff control Fixed Enthalpy 180 160 air of dry ratio, grains/lb humidity 140 economizer 120 disabled whenever 100 hOA > 28 Btu/lb