1. What is Energy Use Intensity (EUI)?

Energy Use Intensity (EUI) is a key metric used to measure a building's energy efficiency. It represents the amount of energy consumed per unit area per year, typically expressed in kBtu per square foot per year.

2. How Does the Calculator Work?

The calculator uses the EUI formula:

Where:

• \( EUI \) — Energy Use Intensity (kBtu/ft²/year)
• \( Total Energy \) — Total energy consumption (kBtu/year)
• \( Floor Area \) — Total floor area of the building (ft²)

Explanation: The equation calculates energy efficiency by dividing total annual energy consumption by the total floor area of the building.

3. Importance of EUI Calculation

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

4. Using the Calculator

Tips: Enter total energy consumption in kBtu/year and floor area in square feet. Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a good EUI value for buildings?
A: EUI values vary by building type. Lower EUI indicates better energy efficiency. Commercial buildings typically range from 50-200 kBtu/ft²/year.

Q2: How can I improve my building's EUI?
A: Implement energy efficiency measures such as LED lighting, HVAC upgrades, better insulation, and energy management systems.

Q3: Does EUI account for different building types?
A: EUI should be compared against similar building types as energy usage patterns differ significantly between, for example, offices, hospitals, and schools.

Q4: What's the difference between source and site EUI?
A: Site EUI measures energy consumed at the building, while source EUI accounts for energy losses in generation and transmission.

Q5: How often should EUI be calculated?
A: EUI should be calculated annually to track energy performance trends and measure the effectiveness of energy efficiency improvements.