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Efficiency Formula:
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The BRE Group Domestic Heat Pump Energy Efficiency Calculator estimates the efficiency of a heat pump system by comparing the heat output to the electrical input. It provides a standardized method to assess heat pump performance in residential applications.
The calculator uses the efficiency formula:
Where:
Explanation: The formula calculates the ratio of useful heat output to the electrical energy input, expressed as a percentage to indicate system efficiency.
Details: Accurate efficiency calculation is crucial for evaluating heat pump performance, comparing different systems, optimizing energy consumption, and assessing the economic and environmental benefits of heat pump installations.
Tips: Enter heat output and input values in kWh. Both values must be positive numbers measured over the same time period for accurate results.
Q1: What is a good efficiency percentage for heat pumps?
A: Modern heat pumps typically achieve efficiencies of 300-400% (COP of 3-4), meaning they produce 3-4 units of heat for every unit of electricity consumed.
Q2: How does this differ from Coefficient of Performance (COP)?
A: While both measure efficiency, COP is expressed as a ratio (Output/Input) while efficiency is expressed as a percentage. Efficiency = COP × 100%.
Q3: What factors affect heat pump efficiency?
A: Outdoor temperature, system design, installation quality, maintenance, and the temperature difference between heat source and delivery point all impact efficiency.
Q4: When should efficiency measurements be taken?
A: For accurate annual performance assessment, measurements should be taken across different seasons to account for varying outdoor temperatures.
Q5: Are there limitations to this calculation method?
A: This method provides a snapshot of efficiency. For comprehensive assessment, seasonal performance factors (SPF) should be considered over longer periods.