1. What is a Heat Pump Size Calculator?

Definition: This calculator determines the required heat pump size based on building heat loss and the heat pump's coefficient of performance (COP).

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The heat loss is divided by the COP to determine the minimum heat pump size 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 heat pump's COP (default 3.5). Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my building's heat loss?
A: Conduct a heat loss calculation or consult an HVAC professional who can perform a Manual J calculation.

Q2: What is a typical COP value?
A: Most modern heat pumps have COPs between 3.0-4.0, but this varies by model and operating conditions.

Q3: Should I add a safety factor to the calculated size?
A: Yes, consider adding 10-20% to account for extreme weather conditions and system efficiency variations.

Q4: Does this calculation work for cooling as well?
A: No, cooling loads require different calculations. This is specifically for heating applications.

Q5: What if my heat pump has variable capacity?
A: The calculation still applies, but variable capacity units can modulate output to better match the load.