Methodology for the Evaluation of Natural Ventilation in ... - Cham

First NorthUpper Window 0.17 m/s -0.15 m/sLower Window 0.42 m/s 0.42 m/sSecondUpper Window -0.31 m/s -0.5 m/sLower Window -0.23m/s -0.40 m/sStacks -0.70 m/s ---0.70m/s0.31m/s0.23m/sSecond Floor North0.17m/s0.13m/s0.42m/sFirst Floor NorthAtriumFirst Floor South0.42m/sFigure 57. Airflow Patterns and Velocities for Stacks Open CaseGround Floor SouthHeater0.69m/s0.74m/sAt the ground floor level, the thermocouple closest to the floor in the heated zone (Figure 58)recorded the warmest temperature since it is within 2cm of the heated aluminum plate. Thetemperatures were slightly cooler in the mid-height of the heated zone and then warmer at theceiling level. The cooler temperatures at mid-height were due to the inflow of ambient air atapproximately 17°C, while the warmer temperature at the ceiling were caused in part byradiation to the ceiling and subsequent convection to the air near the ceiling . The maximumtemperature differential from floor to ceiling measured in the heated zone for the ground floorlevel was 1.7°C. The difference in temperatures for the same location between the stacks openand stacks closed case at the same location was 0.1°C. At the column, the temperaturestratification pattern was similar for the three cases presented (Figure 59). The lower threethermocouples were at virtually the same temperature, while the upper-most thermocouple had a0.5°C temperature increase as compared to the lower thermocouples. The air from the groundfloor heated zone rose in the space and exited at the ceiling level into the atrium, in closeproximity to the top thermocouple location at this point.132