What Size Air Source Heat Pump Calculator

Heat Pump Size Formula:

\[ \text{Size} = \frac{\text{Heat Loss}}{\text{COP}} \]

Heat Pump Size (kW):

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1. What is a Heat Pump Size Calculator?

Definition: This calculator determines the required size 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:

\[ \text{Size} = \frac{\text{Heat Loss}}{\text{COP}} \]

Where:

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

Explanation: The building's heat loss is divided by the heat pump's efficiency (COP) to determine the minimum required capacity.

3. Importance of Proper Heat Pump Sizing

Details: Correct sizing ensures efficient operation, prevents short cycling, maintains comfort, and extends equipment life.

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 our Heat Loss Calculator tool.

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

Q3: Should I oversize my heat pump?
A: Generally no - heat pumps work most efficiently when properly sized. Oversizing can reduce efficiency.

Q4: Does this account for defrost cycles?
A: No, consider increasing the calculated size by 10-15% in very cold climates to account for defrost cycles.

Q5: What about domestic hot water needs?
A: This calculator is for space heating only. Add additional capacity if the heat pump will also provide hot water.