1. What is Energy Use Intensity (EUI)?

Energy Use Intensity (EUI) is a measure of a building's energy consumption relative to its size. It represents the amount of energy a building uses per square foot annually, allowing for comparison between buildings of different sizes.

2. How Does the Calculator Work?

The calculator uses the EUI formula:

Where:

• Annual Energy Use — Total energy consumption in thousands of British Thermal Units (kBtu)
• Floor Area — Total floor space of the building in square feet (ft²)

Explanation: The equation divides the total annual energy consumption by the building's floor area to normalize energy use for comparison purposes.

3. Importance of EUI Calculation

Details: EUI is crucial for benchmarking building energy performance, identifying efficiency opportunities, and tracking progress in energy conservation measures.

4. Using the Calculator

Tips: Enter annual energy use in kBtu and floor area in ft². Both values must be positive numbers. For accurate results, use consistent units of measurement.

5. Frequently Asked Questions (FAQ)

Q1: What is a good EUI value?
A: EUI benchmarks vary by building type. Lower EUI generally indicates better energy efficiency. The U.S. average for office buildings is about 80 kBtu/ft²/year.

Q2: How do I convert other energy units to kBtu?
A: Common conversions: 1 kWh ≈ 3.412 kBtu, 1 therm ≈ 100 kBtu, 1 MMBtu = 1000 kBtu.

Q3: Should EUI include all energy sources?
A: Yes, for comprehensive analysis, include electricity, natural gas, district energy, and any other energy sources.

Q4: What factors affect EUI?
A: Climate, building type, operating hours, equipment efficiency, and occupant behavior all influence EUI.

Q5: How can I improve my building's EUI?
A: Energy efficiency measures like LED lighting, HVAC upgrades, better insulation, and occupant engagement can reduce EUI.