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Journal Article by ASHRAE, 2002
Mukesh K. Khattar, Ph.D., P.E., and Michael J. Brandemuehl, Ph.D., P.E.
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In a typical conventional HVAC system, outside ventilation air is mixed with return or recirculation air. Then, this mixed airstream is conditioned over a set of heating or cooling and dehumidification coils before being delivered to the space. A majority of the supplied air is returned to the unit, where it is mixed with fresh outdoor ventilation/makeup air (to replace the exhausted air), and the mixed airstream is reconditioned and delivered back to the space.
Citation: ASHRAE Journal, vol. 44, no. 5, May 2002