1. What is a Radiator Calculator for Heat Pumps?

Definition: This calculator determines the required radiator power based on the heat demand and the heat pump's Coefficient of Performance (COP).

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The heat demand is divided by the COP to account for the heat pump's efficiency in converting electrical energy to heat energy.

3. Importance of Proper Radiator Sizing

Details: Correct radiator sizing ensures optimal heat distribution, energy efficiency, and prevents system overloading or underperformance.

4. Using the Calculator

Tips: Enter the building's heat demand in kW and the heat pump's COP (default 3.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical COP value for heat pumps?
A: Modern heat pumps typically have COPs between 2.5 and 4.0, depending on temperature conditions and system efficiency.

Q2: How do I determine my building's heat demand?
A: Heat demand can be calculated through heat loss calculations or obtained from energy performance certificates.

Q3: Why does COP affect radiator size?
A: Higher COP means the heat pump is more efficient, requiring less radiator power to deliver the same heat output.

Q4: Should I add a safety margin to the calculated value?
A: Yes, it's recommended to add 10-15% to account for unusual weather conditions and system inefficiencies.

Q5: Can I use this for underfloor heating systems?
A: The principle is similar, but underfloor heating calculations should consider the specific thermal properties of floor constructions.