1. What is a Radiator Size Calculator for Heat Pumps?

Definition: This calculator determines the required radiator output (in kW) based on room heat loss and the heat pump's coefficient of performance (COP).

Purpose: It helps HVAC professionals and homeowners properly size radiators when using heat pump systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( kW \) — Required radiator output (kilowatts)
• \( \text{Room Heat Loss} \) — Heat loss of the room (kilowatts)
• \( COP \) — Coefficient of Performance of the heat pump (dimensionless)

Explanation: The room's heat loss is divided by the heat pump's efficiency (COP) to determine the radiator size needed to maintain comfortable temperatures.

3. Importance of Proper Radiator Sizing

Details: Correct radiator sizing ensures efficient operation, prevents underheating or overheating, and maximizes the heat pump's efficiency.

4. Using the Calculator

Tips: Enter the room 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 room's heat loss?
A: Heat loss calculations consider room size, insulation, windows, and temperature difference. Professional energy assessments provide accurate values.

Q2: What's a typical COP value?
A: Most modern heat pumps have COPs between 3.0-4.0, but check your specific model's specifications.

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

Q4: Should I round up the calculated radiator size?
A: Yes, it's common practice to round up to the nearest standard radiator size for a safety margin.

Q5: Does this work for underfloor heating too?
A: The principle is similar, but underfloor heating requires different calculations due to its larger surface area and lower temperature operation.