Home
Back
Energy Efficiency Formula:
| From: | To: |
The Energy Efficiency Factor (EFF) measures how efficiently a system converts input energy into useful output energy. It is expressed as a percentage and calculated as the ratio of useful energy output to total energy input.
The calculator uses the Energy Efficiency formula:
Where:
Explanation: The formula calculates the percentage of input energy that is converted into useful work output, with higher percentages indicating greater efficiency.
Details: Energy efficiency calculations are crucial for evaluating system performance, optimizing energy usage, reducing energy costs, and minimizing environmental impact through better resource utilization.
Tips: Enter both useful output and total input energy values in joules (J). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is considered a good energy efficiency percentage?
A: Generally, higher percentages are better. Most systems range from 20-95% efficiency depending on the technology and application.
Q2: Can efficiency exceed 100%?
A: No, efficiency cannot exceed 100% as it would violate the law of conservation of energy, suggesting more energy output than input.
Q3: What units should I use for energy values?
A: While joules are standard, any consistent energy unit can be used (calories, kWh, etc.) as long as both input and output use the same units.
Q4: How does this differ from coefficient of performance (COP)?
A: COP is used for heat pumps and refrigerators and can exceed 100%, while energy efficiency factor typically refers to the ratio of useful output to total input.
Q5: Why is energy efficiency important?
A: Improving energy efficiency reduces energy consumption, lowers operating costs, decreases environmental impact, and enhances sustainability.