Exercise Five: evaluation |
The Building Design Advisor (BDA) software is a tool for assisting designers to make energy- and lighting-related decisions at the initial, schematic phases of building design. It allows designers to use a number of analysis and visualization tools quikly and effectively, and to integrate the output in support of informed, multi-criterion decision making. In this exercise, I will use BDA to evaluate the Master Bedroom in the GIMS house I have designed, in terms of energy and lighting performances. By changing the location and materials of windows, I will provide three different options and evaluate for: 1. Spacial workplane illuminance2. Temporal workplane illuminance 3. Total energy use 4. Monthly energy by fuel type. Results of analysis will be shown graphically in the Decision Desktop.
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Solution 1. North window
I create a north window in the room, using the default material for the frame. I change the glazing material to enhance the visiable transmittance. From the schemes shown in the Decision Desktop, we can see that the spatial workplace illuminance falls down sharply from the window to the inner part of the room. The 3D graph for the temporal workplace illuminance is quite flat. It shows that the illumiance condition of this room needs to be enhanced.
Solution 2. South and East windows For a 12"X16" master bedroom, only one window maybe not enough for its illumiation and ventilation. So in this solution, I add one window and adjust the location of the former one. Then there are an east window and a south window in this bedroom. I also change the glazing of the two windows. When I choose the material, I balance all its characters, such as visible transmittance, thermal resistance, etc. I try to find an optimal combination of those aspects. From the comparison of the solution 1 and solution 2, we can see that both themonthly energy by fuel type and total energy use increase. That means the more openings in a room, the more energy it cost. But the temporal workplace illuminance increase too. That proves two windows are necessary for a bedroom as such size.
Solution 3. North and East windows Given that it is a bedroom, the demand for nature illuminance is not so great, but it is important to reduce the energy use, I move the south window to the north side, then change the glazing material of both the windows to Double Clear with Ref. coating. The illuminance condition of this solution is not so good as the solution 2, but both themonthly energy by fuel type and total energy use decrease greatly. They are even less than that of the solution 1, which has only one window. But the illuminance condition of solution 3 is much better than that of solution 1.
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