- Understand how Performance-Based Design works
- Learn how you can understand and influence the performance of your building
Performance-based design is an iterative, three step process in which you continually assess how your building is performing, what is driving that performance, and what you can do to influence it.
Download a sample model to walk through the core training exercise:
1a. How is my building performing?
The Sefaira Dashboard
The Performance Dashboard is designed to give a quick snapshot of energy and daylight performance as the design evolves.
1b. Setting use type, location and baseline. How did performance change?
Setting up real time analysis so that Sefaira provides meaningful feedback on the performance of your design only requires three inputs; a use type, location/climate zone and baseline.
- Choose a building type of either Office, Residential, School, Healthcare or Laboratory.
- Enter a location, Sefaira supports locations all over the world.
- Choose baseline and climate zone (climate zones are only set for ASHRAE 90.1)
- Chose from either a Standard Baseline, including default ASHRAE 90.1 and Part L, or adjust the sliders to create your own custom baseline which can be recalled later on to quickly re-apply to other projects.
- Clicking on the slider will show the exact parameter value and units.
- Daylighting Based Controls account for the impact of good daylight on your buildings lighting energy use.
- Click to return to the Performance Dashboard.
2. Element performance graph: digging deeper
The Element Performance graph shows which building elements are responsible for heating and cooling loads. Red flows indicate negative (bad) contribution towards either the heating (on the left) or cooling (on the right) loads. Green flows indicate positive contributions towards either heating or cooling loads.
3. Mitigating strategies
Depending on the building elements that mainly drive your building’s performance you need to apply the strategies that will mitigate these effects.The table below lists the main building elements and strategies you canapply to improve the performance of your building:
- Reduce envelope area (e.g. a more compact building form)
- Improve insulation levels (change R-value or U-factor)
- Reduce glazing area
- Improve window insulation (U-factor)
- Reduce glazing area on sun-facing facades
- Add shading
- Improve glazing properties (reduce Solar Heat Gain Coefficient)
- Reduce leakage. (This is primarily an issue of detailing, and is dealt with as a single “leakage” value in Sefaira.)
- Specify more efficient lights. (Reduce Lighting Power Density)
- Consider daylight-based lighting controls, which turn off electric lights when sufficient daylight is available.
(See “daylighting” below.)
- Specify more efficient equipment, or install systems that reduce “vampire loads” (power consumed when devices are in “standby” mode). (Reduce Equipment Power Density)
- Reduce ventilation rate (if appropriate – ventilation rates are often governed by code requirements)
- Use a mechanical heat recovery ventilator (HRV) or energy recovery ventilator (ERV), which uses exhaust air to pre-condition fresh air.
- Use narrow floorplates
- Add glazing (especially high windows)
- Improve glazing properties (T-vis, or the amount of visible light the windows let in)
- Reduce glazing area (especially on sun-facing facades)
- Add shading
WHAT YOU’VE LEARNED
- You can now understand how your building is performing, both in terms of energy and daylighting
- You have learned how to understand in more detail what is driving your building performance
- You know what the best strategies are to overcome the most common building performance issues