Page 64 - Build 151

100
80
60
40
20
0
Simple model Measured data
REASONABLY
GOOD
AGREEMENT
200 Day number of year 220 240
Available for industry to use
The ventilation module used to simulate the air movement in this school building is available in newer versions of WUFI to commercial licence holders. It does require a greater level of information from the user to be used e ectively.
The key to this is knowing the amount of air movement and having a solid understanding of the indoor conditions. The new BRANZ roof permeance project and the WUFI development project (see pages 52–53) will provide further insight and address these issues.
Internal moisture
160
180
Figure 2: Comparison of school roof simulated and actual data.
The process of adequately capturing moisture transport via air ows across boundaries is one critical parameter to a successful model. BRANZ is currently working to characterise air ow resistances of di erent ceiling types, and these results will be published as they become available.
A better understanding of these ceiling airflow resistances as an input to WUFI simulations will help designers and consultants to create more realistic models and ultimately lead to better building design.
62 — December 2015/January 2016 — Build 151
FEATURE SECTION
Relative humidity (%)