Size a Heat Pump Calculator

Heat Pump Size Formula:

\[ \text{Size} = \frac{\text{Load}}{\text{COP}} \]

Heat Pump Size (kW):

Definition: This calculator determines the required heat pump size based on the building's heat load and the system's coefficient of performance.

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

The calculator uses the formula:

\[ \text{Size} = \frac{\text{Load}}{\text{COP}} \]

Where:

Explanation: The heat load is divided by the COP to determine the minimum heat pump capacity needed.

Details: Correct sizing ensures energy efficiency, proper heating/cooling, and prevents short cycling or inadequate performance.

Tips: Enter the building's heat load in kW and the heat pump's COP (default 3.5). Both values must be > 0.

Q1: What is a typical COP value?
A: Modern heat pumps typically have COPs between 3.0-4.5, with higher values indicating better efficiency.

Q2: How do I find my building's heat load?
A: A professional heat load calculation (Manual J) is recommended for accurate results.

Q3: Should I round up the calculated size?
A: Yes, it's common practice to round up to the nearest available heat pump size.

Q4: Does this account for extreme temperatures?
A: No, consider the heat pump's performance at your area's design temperature when selecting COP.

Q5: What about cooling capacity?
A: This calculates heating capacity. For cooling, use SEER ratings instead of COP.