How many kW of heat pump do I need?

The calculation of thermal power (in kW) required by a heat pump depends on several factors, such as the size of the space, the temperature you want to maintain, the insulation of the building and the external conditions (ambient temperature).

To calculate the required thermal power, you should take into account the following:

Key Factors:

1. Volume or Surface Area of Space:
   • The volume of the space in cubic meters (m³) or the surface area (in m²) is crucial for the calculation.
2. The Temperature Difference:
   • The difference between the desired indoor temperature and the outdoor temperature.
3. Building Insulation:
   • Better insulation means less heat loss, so you need less power from the heat pump.
4. Thermal Losses:
   • Heat losses due to ventilation, closed windows, walls, etc., affect the required power.

General Calculation:

1. For Heating: We usually calculate the required power based on the surface area of the space and the temperature difference:

THE thermal capacity per square meter depends on the area and insulation of the house, but usually ranges from 50 to 100 W/m² for well-insulated houses and can be higher for poorly insulated ones.

2. For Cooling: The calculation for cooling is also analogous, and the power can be calculated as follows:

Example:

Let's assume you have a 100 m² space and you want to heat or cool the space in a well-insulated house:

For Heating:

If the thermal capacity is 70 W/m² and the temperature difference is 20°C, then the required power for heating will be:

For Cooling:

If the cooling capacity is 0.1 kW/m²:

Conclusions:

• THE heat pump to heat a well-insulated 100 m² house you may need about 14 kW.
• For cooling, the pump may need around 10 kW.

For an accurate calculation, it is recommended to consult a specialist, as insulation, weather conditions and other factors can affect the required thermal power.