To answer the question regarding the measurement unit used in Energy Use Intensity (EUI), follow these steps:
1. Understand the definition of EUI: Energy Use Intensity (EUI) is a metric used to represent a building's energy consumption. It's usually measured as the amount of energy used per unit area over a specific period, typically one year.
2. Analyze the options provided:
- A. cubic foot: This option suggests measuring energy use per cubic foot of the building's volume. However, this is less common since energy usage is more typically associated with the building’s area rather than its volume.
- B. day: This option implies a time-based measure on a daily basis. However, EUI measures energy use over a longer period (typically a year), not per day.
- C. square foot: This option suggests measuring energy use per square foot of the building's area. This is a common and widely accepted unit because the energy consumption of a building is often related to its area rather than its volume or other time frames.
- D. year: This option suggests measuring energy use per year but without a reference to a spatial dimension. EUI needs to express energy use per unit area, not just per year alone.
3. Determine the most accurate and standard unit: The most widely used and accepted unit is "per square foot." This unit considers the building's area, allowing for a fair comparison between buildings of different sizes.
Based on the explanation above, the correct answer is:
C. square foot
