1. What is Window Solar Heat Gain?

Window Solar Heat Gain refers to the amount of solar radiation that enters through a window, contributing to heat buildup in a space. It's an important factor in building energy efficiency and thermal comfort.

2. How Does the Calculator Work?

The calculator uses the solar heat gain equation:

Where:

• \( SHGC \) — Solar Heat Gain Coefficient (0-1)
• \( Area \) — Window area in square meters
• \( Solar Intensity \) — Incident solar radiation in W/m²

Explanation: The equation calculates the total solar heat gain through a window based on its properties and the intensity of sunlight.

3. Importance of Solar Heat Gain Calculation

Details: Calculating solar heat gain helps in designing energy-efficient buildings, selecting appropriate window treatments, and sizing HVAC systems.

4. Using the Calculator

Tips: Enter SHGC (between 0 and 1), window area in square meters, and solar intensity in W/m². All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is SHGC?
A: Solar Heat Gain Coefficient measures how well a window blocks heat from sunlight. Lower SHGC means less solar heat transmission.

Q2: How do I find the SHGC of my windows?
A: Check window manufacturer specifications or look for ENERGY STAR ratings on the window label.

Q3: What are typical solar intensity values?
A: Varies by location and time, but peak solar intensity is about 1000 W/m² on a clear day at sea level.

Q4: How does window orientation affect heat gain?
A: South-facing windows receive more direct sunlight in northern hemisphere, increasing potential heat gain.

Q5: Can I use this for multiple windows?
A: For multiple windows, calculate each separately and sum the results, or use total area if all have same SHGC.