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

Height from Floor (m)3.53.02.52.01.51.00.53 Stacks Open1 Stack OpenStacks Closed0.020.0 21.0 22.0 23.0 24.0 25.0 26.0Temperature ( C)Figure 61. Full Model Scaled Temperature Stratification for Full-Scale Building: First FloorSouth Heated ZoneAt the north side of the first floor, the temperature measurements at the column were slightlydifferent than those for the south first floor level. The lower three thermocouple measurementswere very similar in all three cases presented, while the upper-most thermocouple had a 1.2°Ctemperature increase above the other three points (Figure 62). The same pattern followed for allof the cases presented. The warm temperature at the ceiling was due to airflow from the firstfloor north that rose and exited either through the stacks (in the stacks-open cases) or through thesecond floor windows (in the stacks closed cases). The small amount of airflow that exited theupper window at the first floor level in the stacks closed case did not influence the warm air atthe first floor north near the atrium. In the heated zone at the first floor in the north half of themodel the measured temperatures were cooler near the floor due to incoming air, as was seen onthe south side of the first floor. However, on the north side at mid-height in the heated zone thetemperatures were higher due to the airflow patterns in the space. Some air entered from theatrium into the first floor north zone and was warmed by the heaters in the space (Figure 63).135