scope:

ABSTRACT

Accurate determination of air-to-fluid heat exchangers' capacity requires accurate measurement of the entering and leaving airstreams' temperature and humidity. The most reliable approach to determine average conditions is to first thoroughly mix incoming and leaving airstream and then sample air from numerous locations using an air sampling apparatus. Available research in open literature is focused on mixers for round ductwork with only very limited guidelines available for commonly utilized square ductwork and air samplers.

ASHRAE RP-1733 will provide updated design guidelines for mixers as applied to commonly used square ductwork as well as for air sampling using traditional sampling mechanisms or a combination of RTD grid and humidity sampling tubes connected to a chilled mirror hygrometer. This presentation will provide an update on current progress of mixer evaluation as part of RP-1733.