Ashrae Journal - December 2008 - (Page 27) we connect as the maximum allowable values above which a signal to the system operator or other response would be initiated. The actual response taken if the CO2 criteria are exceeded is up to the individual building owner or operator. A local alarm or building automation system signal, or both, could be sent, or only a record could be made that this event occurred for future diagnostic purposes. Summary The use of CO2 monitoring as part of an overall outdoor air monitoring program is becoming more common in the operation of a modern building. To date, minimal practical guidance has been given as to what CO2 concentrations would be considered the upper limit. This article presents a set of recommended maximum CO2 concentration differences as a function of the design combined minimum outdoor airflow and the anticipated metabolic rate for the zone occupants that can be used as upper acceptable limits for an outdoor air monitoring fault detection program. References 1. Schell, M. and D. Int-Hout. 2001. “Demand control ventilation using CO2.” ASHRAE Journal 43(2):18 – 24. 2. Warden, D. 2004. “Supply air CO2 control.” ASHRAE Journal 46(10):25 – 35. 3. Schell, M. and D. Smith. 2002. “Assessing CO2 control in retrofits.” ASHRAE Journal 44(11):34 – 41. 4. Lawrence, T. 2004. “Demand-controlled ventilation and sustainability.” ASHRAE Journal 46(12):117 – 121. 5. Dougan, D. and L. Damiano. 2004. “ CO2–based demand control ventilation: do risks outweigh potential benefits?” ASHRAE Journal 46(10):47 – 53. 6. Stanke, D. 2006. “Standard 62.1-2004 system operation: dynamic reset options.” ASHRAE Journal 48(12):18 – 32. 7. Fisk, W.J., D. Faulkner, and D.P. Sullivan. 2006. “Measuring OA intake rates.” ASHRAE Journal 48(8):50 – 57. 8. Kettler, J.P. 1998. “Controlling minimum ventilation volume in VAV systems.” ASHRAE Journal 40(5):45 – 50. 9. Seppänen, O.A., W.J. Fisk, and M.J. Mendell. 1999. “Associations of ventilation rates and CO2 concentrations with health and other responses in commercial and institutional buildings.” Indoor Air 9:226 – 252. 10. Nabinger, S.J., A.K. Persily, and W.S. Dols. 1994. A study of ventilation and carbon dioxide in an office building. ASHRAE Transactions 100(2):1264 – 1273. 11. Persily, A.K. 1997. “Evaluating building IAQ and ventilation with indoor carbon dioxide.” ASHRAE Transactions 103(2):193 – 204. 12. Lawrence, T.M. and J.E. Braun. 2006. “Modeling of CO2 concentrations in small commercial buildings.” Buildings and Environment 41(2):184 – 194. 13. Taylor, S. 2006. “CO2-based DCV using 62.1-2004.” ASHRAE Journal 48(5):67 – 75. 14. ASHRAE. 2007. 62.1-2007 User’s Manual. 15. 2005ASHRAE Handbook—Fundamentals, Chapter 8, “Thermal Comfort.” 16. Solomon, S., et al. 2007. Climate Change 2007, The Physical Science Basis: Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, U.K.: Cambridge University Press. December 2008 Honeywell Analytics introduces the industry’s controlled ventilation solution: IAQPoint. It’s multilingual, it speaks your language. IAQPoint is the only indoor air quality monitor you will need to satisfy all of your demand-controlled ventilation bid requirements. It integrates easily with virtually any building automation system through its BACnet, LonWorks, FLN, Modbus or analog outputs. IAQPoint produces three sensor outputs (CO2, temperature and humidity) for the price of a typical single-sensor device. Honeywell designed the IAQPoint to install quickly and easily with a small and sleek enclosure that meaning you will spend less time installing the units. IAQPoint is ideal for large commercial environment where money can be saved through partner for Indoor Air Quality/Demand Control Ventilation solutions. Honeywell Analytics. See us at AHR Expo 2009 (ASHRAE) (Booth 3823) To learn more, call 1-800-563-2967, visit www.vulcaininc.com or email detectgas@honeywell.com for a free copy of Gas Book, our 84-page guide to gas detection. © 2008 Honeywell International Inc. All rights reserved. www.info.hotims.com/16020-20 ASHRAE Journal 27 http://www.vulcaininc.com http://www.vulcaininc.com http://www.info.hotims.com/16020-20
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