1. What is Energy Use Intensity (EUI)?

Energy Use Intensity (EUI) is a measure of a building's energy efficiency, calculated as energy consumption per unit area. It's typically expressed in kBtu per square foot per year (kBtu/ft²/year) and allows for comparison of energy performance across different buildings.

2. How Does the Calculator Work?

The calculator uses the EUI equation:

Where:

• \( \text{Total Energy} \) — Annual energy consumption in kBtu
• \( \text{Floor Area} \) — Total floor area in square feet

Explanation: The equation divides the total energy consumed by the building in a year by its total floor area to determine energy efficiency.

3. Importance of EUI Calculation

Details: EUI is crucial for benchmarking building energy performance, identifying opportunities for energy savings, and complying with energy efficiency standards and regulations.

4. Using the Calculator

Tips: Enter total annual energy consumption in kBtu and total floor area in square feet. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a good EUI value?
A: Lower EUI indicates better energy efficiency. Benchmark values vary by building type, climate, and occupancy.

Q2: How can I reduce my building's EUI?
A: Strategies include improving insulation, upgrading HVAC systems, installing energy-efficient lighting, and implementing smart controls.

Q3: What's the difference between site EUI and source EUI?
A: Site EUI measures energy consumed at the building, while source EUI accounts for energy losses in generation and transmission.

Q4: Can EUI be used for all building types?
A: Yes, but interpretation should consider building type, as hospitals and laboratories naturally have higher EUIs than offices.

Q5: How often should EUI be calculated?
A: Annually to track performance trends, or more frequently when implementing energy efficiency measures.