Net ZEB Design Processes and Tools - Modeling, Design, and Optimization of Net-Zero Energy Buildings - page 225

designer may wish to use this value in the design, assuming it is
practical, economical, and compatible with other design aspects.
2. The relative sensitivity of a parameter. This is particularly useful when
multiple parameters are compared. For instance, if there are multiple
methods for obtaining the same desired result, the parameter with the
steepest LoI may be the one for which the desired outcome is easiest to
achieve. Furthermore, if a costly upgrade has little bearing on energy
performance, there would be little benefit to making that investment.
3. The relative importance of accurately modeling a building system.
Generally, the most care in accurate modeling should be given to the
aspects that are most sensitive. For instance, if the model indicates that
the optical properties of windows are important, then care should be
given to obtain specifications for the window that are based on detailed
measurements. Sensitivity analysis is a very important
confidence-building exercise for modelers.
The implementation of parametric analyses in Ecos (O'Brien, Athienitis,
and Kesik, 2009) is shown in Figure 4.25 , where the effect of window size
for four different orientations is explored. Parametric analysis was used
extensively in the design process of ÉcoTerra, as described in Chapter 7 .