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The present study focused on the effect of supply airtemperature on air distribution in a room with floor heating(FH) or ceiling heating (CH) and mixing ventilation (MV) ordisplacement ventilation (DV). The vertical distribution of airtemperature and velocity in the occupied zone and the horizontaldistribution of containment concentration in the breathingzone were measured as the supply air temperature rangedfrom 15.0°C (59°F)to 19.0°C (66.2°F). The results showed thatthe vertical air temperature differences were less than 0.3°C(32.5°F) with FH+MV or CH+MV and between 1.9°C(35.4°F) and 4.2°C (39.6°F) with FH+DV or CH+DV. Theturbulence intensity varied from 12.5% to 15.5% with FH+MVor CH+MV and from 6.0% to 10.8% with FH+DV or CH+DV.The air-distribution effectiveness was close to 1.0 withFH+MV or CH+MV and between 1.06 and 1.16 with FH+DVor CH+DV. The results in this paper are relevant to the designand control of the hybrid systems with radiant heating systemsand mechanical ventilation systems.

Citation: 2017 Winter Conference, Las Vegas, NV, Transactions, Vol 123, Pt 1