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

a) Air Modelb) Water ModelFigure 50. Comparison of Reduced-Scale a) Air Model and b) Water Model 3 at a WindowOpening7.1.2 Two Heated Zone CaseAs described in Chapter 6, with the two heated zone case, temperature and velocitymeasurements were recorded for experiments with the stacks open and with the stacks closed.The temperature stratification in each heated zone, at the column for each level where the heatedzone connected to the atrium, and within the atrium were measured for comparison.In the two heated zone experiments, the lower windows were used for both the ground floor andfirst floor heated zones. The number of stacks open was varied, from three stacks open to allthree stacks closed. This affected the entering and exiting air velocities and resultingtemperature distribution in both the heated zones and within the atrium. The air velocitymeasured using the hot-wire anemometer and resulting airflow through the inlet and outletopenings are presented in Table 33. The air velocities presented are the average of all thevelocities measured at each window for a given floor level. A schematic of the airflow patternsfor the stacks open case is shown in Figure 51.3 Data provided by S. Livermore, BP Institute, Cambridge University. December 2004.126