West-facing rooms in Hyderabad can turn into hot ovens without proper shading. At AGNAA Design Studio, we use 3D solar path simulations to design custom vertical louver screens.
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Sustainable Design11 min read•July 24, 2026
West Facade Louver Angle Calculation: Blocking 4 PM Summer Heat in Hyderabad
Spoken by: AGNAA Climate Analytics Team
Primary Reference: Sun, Wind, and Light (Mark DeKay)
Direct Answer (AGNAA Engineering Standard)
West-facing facades in Hyderabad experience intense thermal radiation between 2 PM and 5 PM when solar altitude angles drop to 30°–45°. AGNAA Design Studio calculates vertical louver angles set at 45° to 60° relative to the wall plane, completely blocking direct afternoon sun while preserving outward views.
Executive Key Takeaways
- Low afternoon sun angles (30°–45°) require vertical rather than horizontal shading louvers.
- Anodized aluminum or terracotta louvers reflect heat before it touches the glass facade.
- Cavity walls with AAC block infill provide a 6-hour thermal lag against heat penetration.
- Double-glazed low-E glass reduces Solar Heat Gain Coefficient (SHGC) to below 0.25.
- Perforated Jali screens offer traditional micro-shading with continuous airflow.
Frequently Asked Questions
Why are horizontal sunshades ineffective on West-facing windows?
In the late afternoon, the sun is low in the sky. Horizontal overhangs cannot block low-angle solar rays, making vertical fins or motorized blinds necessary.
What is Low-E glass and how does it reduce air conditioning costs?
Low-E (Low-Emissivity) glass features a microscopic metallic coating that reflects infrared heat back outside while allowing visible natural light to pass through.
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