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HVAC efficiencies

This mechanical control functions as a mechanical substitute for an open window. By mixing outdoor air with recirculated indoor air when exterior temperatures are low, requirements for refrigeration and cooling are reduced. Select 2 terms associated with this efficiency technique:
A. Displacement ventilation
B. Free cooling
C. Economizer cycle
D. AFUE

AnswerAn air-side (C.) economizer cycle is described, and is often referred to as a (B.) free cooling concept.

ARE 4.0 exam prep: BS

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