Appendix I 
Page A 1° 139 
Turbulence intensity 
Because of the random nature of a turbulent flow in a room airspace (Zhang, 1991), the 
turbulence intensity can not be defined the same as the mean air velocity, i.e., turbulence 
intensity varies randomly as shown in table 4.2.01. 
Room temperature 
In general, steady-state for room temperature can take a few hours because of the large mass 
involved. However, the testing room is located within an air conditioned outer room in which the 
temperature is maintained at 22.0±1.5 °C (71.6±2.7 °F) regardless of the weather. Thus, the 
testing room is considered to be at a steady-state all the time. When the testing room door is 
opened, there may be a slight disturbance to the room temperature (usually a fraction of degree 
Celsius). Temperature response after the door was closed for 1, 4, 7, and 10 minutes are shown 
in table 4.2.01. The target room temperature was approximately 22.8 °C (73.0 °F). The testing 
room temperature elevation compared to the outer room temperature (22.0 °C) was due to the 
heating load of step motors and thermisters in the testing room. Temperatures in the testing room 
varied less than 1 percent of the target temperature for all four measurement periods. Therefore, 
the room temperature was in steady state after the door was closed for one minute. 
4.2.3 Conclusion 
A steady state both for velocity and temperature in the testing room can be achieved after the 
door was closed for 4 minutes. Data collection in this project was started 10 minutes after the 
door was closed to ensure steady state. 
