1. What is an Air Source Heat Pump Radiator Size Calculator?

Definition: This calculator determines the appropriate radiator size (in kW) needed for an air source heat pump system based on the building's heat loss and the heat pump's coefficient of performance (COP).

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( kW \) — Required radiator size (kilowatts)
• \( \text{Heat Loss} \) — Building's heat loss (kilowatts)
• \( COP \) — Coefficient of Performance of the heat pump (dimensionless)

Explanation: The heat loss is divided by the COP to determine the radiator size needed to maintain comfortable temperatures.

3. Importance of Proper Radiator Sizing

Details: Correct radiator sizing ensures efficient heat pump operation, optimal comfort, and prevents short cycling or inadequate heating.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my building's heat loss?
A: Heat loss can be calculated by a professional energy assessment or using heat loss calculation software.

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

Q3: Why does radiator size decrease with higher COP?
A: Higher COP means the heat pump is more efficient, requiring less radiator capacity to deliver the same amount of heat.

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

Q5: Does this account for different room temperatures?
A: No, the heat loss input should already account for desired room temperatures and external conditions.