Room Air Stratification in Combined Chilled Ceiling and Displacement Ventilation Systems

Radiant chilled ceilings (CC) with displacement ventilation (DV) represent a promising integrated system design that combines the energy efficiency of both sub-systems with the opportunity for improved ventilation performance resulting from the thermally stratified environment of DV systems. The purpose of this study was to conduct laboratory experiments for a typical U.S. interior zone office to investigate how room air stratification is affected by the ratio of cooling load removed by a chilled ceiling to the total cooling load, #, for two different chilled ceiling configurations.

Experimental Models for the determination of the Length of the Adjacent Zone for Displacement Ventilation diffusers

A common problem in room equipped with displacement ventilation is the thermal discomfort due to draft, caused by the excessive air velocity at floor level. While displacement ventilation has been used for decades, no model, neither theoretical nor experimental, exists to predict the length of the adjacent draft zone. Based on the study of detailed experimental data of 7 diffusers (each tested with several outlet sizes), this study proposes two correlation models to predict the length of the adjacent zone.

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