The use of proportion in building performance metrics can vary depending on the parameters being measured and the overall goal of the metric. Here are some ways proportion can be used:
1. Relative comparison: Proportion can be used to compare a value to a benchmark or a baseline. For example, energy consumption can be expressed as a proportion of a building's size or occupancy, which allows for relative comparison across different building types or sizes.
2. Aggregation: Proportion can be used to aggregate performance metrics to a single number. For example, an energy efficiency score can be derived from proportional weights of various energy performance indicators, such as lighting, HVAC, and plug loads.
3. Sensitivity analysis: Proportion can be used to test the sensitivity of a building's performance to certain factors. For example, if the proportion of natural ventilation is increased in a building's design, the cooling load can be reduced and the energy efficiency can be improved.
4. Target setting: Proportion can be used to set targets or goals for building performance. For example, a goal can be set to reduce a building's water use proportionally to its occupancy or change in function.
5. Trend analysis: Proportion can be used to identify trends in building performance over time. For example, the proportion of renewable energy sources used in a building's energy mix can be tracked over time to measure progress towards a carbon-neutral target.
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