1. What is W/m²?

W/m² (Watts per square meter) is a measurement of power density or irradiance. It represents the amount of power (in watts) received per unit area (in square meters).

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Watts \) — Power in watts
• \( m² \) — Area in square meters

Explanation: This calculation shows how concentrated a power output is over a given area.

3. Importance of W/m² Calculation

Details: W/m² is crucial in fields like solar energy (measuring solar irradiance), lighting design, heating systems, and electromagnetic radiation safety.

4. Using the Calculator

Tips: Enter the total power in watts and the area in square meters. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical W/m² value for sunlight?
A: At Earth's surface, maximum solar irradiance is about 1000 W/m² on a clear day at noon.

Q2: How does W/m² relate to energy efficiency?
A: Lower W/m² values often indicate more efficient systems that deliver the same performance with less power per area.

Q3: What's the difference between W/m² and lux?
A: W/m² measures total power, while lux measures visible light intensity as perceived by the human eye.

Q4: How is W/m² used in heating systems?
A: It helps determine the heat output per unit area, important for underfloor heating or radiant panels.

Q5: What's a safe W/m² level for RF radiation?
A: Safety limits vary by frequency, but typical public exposure limits are around 1-10 W/m² for RF fields.