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M410
Air Side Economizer Design Using Psychrometric Analysis

Fred W. Dougherty, P.E.,B.A.E, M.M.E

Since the economizer mandate first appeared in ASHRAE Standard 90.1 in 2004, there has been very little guidance for designers in the professional literature. In particular, there is virtually no guidance on selecting the economizer cutoff high limits, other than a few articles in professional and commercial journals that emphasize energy saving and dismiss occupant comfort considerations. This course provides the first comprehensive design recommendations that cover damper quality control as well as methods to set high limits for energy saving without compromising occupant comfort.

This course provides air side economizer design guidance to help engineers and technicians avoid the errors that lead to economizer failure and resultant occupant discomfort and wasted energy. The most common problem is failed damper systems, which can be avoided by proper sizing and by specifying high quality components. Occupant discomfort can also result from humidity and moisture problems that occur during economizer operation if operating limits are set too aggressively. In this course, the use of psychrometric analysis to set rational operating limits will be demonstrated. Finally, the characteristics of various control systems will be discussed, with examples of how they should be specified.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.


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NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.

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