1. What is an Air Source Heat Pump Size Calculator?

Definition: This calculator determines the required size (in kW) of an air source heat pump based on building heat loss and the system's coefficient of performance.

Purpose: It helps homeowners and HVAC professionals properly size heat pumps for efficient heating system design.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( kW \) — Required heat pump size (kilowatts)
• \( \text{Heat Loss} \) — Building heat loss (kilowatts)
• \( COP \) — Coefficient of Performance (dimensionless)

Explanation: The heat loss is divided by the COP to determine the heat pump capacity needed to maintain comfortable temperatures.

3. Importance of Proper Heat Pump Sizing

Details: Correct sizing ensures energy efficiency, prevents short cycling, maintains comfort, and extends equipment lifespan.

4. Using the Calculator

Tips: Enter the building's heat loss in kW and the expected COP (default 3.0). Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my building's heat loss?
A: Conduct a professional heat loss calculation or use online calculators that consider insulation, windows, and climate.

Q2: What is a typical COP value?
A: Modern air source heat pumps typically have COPs between 2.5-4.0, depending on temperature conditions.

Q3: Should I oversize my heat pump?
A: Generally no - oversizing reduces efficiency and increases costs. Proper sizing is crucial for optimal performance.

Q4: Does this account for extreme cold weather?
A: No, consider your climate and the heat pump's performance at low temperatures when selecting a model.

Q5: How does this differ for cooling calculations?
A: Cooling loads use different calculations - consult an HVAC professional for dual heating/cooling systems.