1. What is Energy Use Intensity (EUI)?

Energy Use Intensity (EUI) is a measure of a building's energy efficiency, representing the amount of energy consumed per unit area annually. It's a key metric for comparing energy performance across different buildings.

2. How Does the Calculator Work?

The calculator uses the EUI equation:

Where:

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

Explanation: The equation calculates energy efficiency by normalizing total energy consumption by the size of the building.

3. Importance of EUI Calculation

Details: EUI is crucial for benchmarking building performance, identifying energy-saving opportunities, and complying with energy efficiency 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 efficiency. Typical values range from 50-150 kBtu/ft²/year for offices, but vary by building type and climate.

Q2: How can I reduce my building's EUI?
A: Improve insulation, upgrade HVAC systems, install energy-efficient lighting, and implement smart building controls.

Q3: Does EUI account for building occupancy?
A: No, EUI is area-normalized only. For occupancy-based metrics, consider Energy Use per Person.

Q4: Can EUI be used for all building types?
A: Yes, but benchmarks vary significantly between building types (e.g., hospitals vs. warehouses).

Q5: What's the difference between site EUI and source EUI?
A: Site EUI measures energy at the building, while source EUI accounts for energy losses in generation and transmission.