1. What is a Heat Pump Radiator Sizing Calculator?

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

Purpose: It helps HVAC professionals and homeowners properly size heat pump radiators for efficient heating systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( kW \) — Heat pump power (kilowatts)
• \( \text{Heat Demand} \) — Building's heat requirement (kW)
• \( COP \) — Coefficient of Performance (dimensionless)

Explanation: The heat demand is divided by the COP to determine the actual electrical power needed from the heat pump.

3. Importance of Proper Radiator Sizing

Details: Correct sizing ensures efficient operation, prevents short cycling, maintains comfort, and maximizes the heat pump's lifespan.

4. Using the Calculator

Tips: Enter the building's heat demand 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 demand?
A: Perform a heat loss calculation or consult an energy assessment. Typical homes need 50-150W per m².

Q2: What's a typical COP value?
A: Modern heat pumps typically have COPs between 3.0-4.5 depending on temperature conditions.

Q3: Why does COP affect radiator sizing?
A: Higher COP means less electrical power is needed to deliver the same heat output.

Q4: Should I include a safety factor?
A: Yes, consider adding 10-20% to the calculated power for extreme weather conditions.

Q5: Does this work for all heat pump types?
A: Yes, the formula applies to air-source, ground-source, and water-source heat pumps.