Question

Which of these is not a passive strategy commonly used in buildings in India?

• A. Thick masonry walls for high thermal mass
• B. Air-tight joints in window fittings
• C. Shading devices like chajjas and louvers
• D. Courtyard planning for natural ventilation

Hint:

Context is everything in passive architecture: Air-tight sealing is designed to trap heat in freezing, cold climates. Tropical and warm climates like India rely instead on breathability, shading, high thermal mass, and steady cross-ventilation.

Answer 1

The Correct Option is B

Concept: Passive design strategies adapt buildings to regional climates to maintain comfortable indoor temperatures without relying on mechanical heating or cooling. In tropical and subtropical regions like India, passive design focuses primarily on minimizing solar heat gain, delaying heat transfer into living spaces, and maximizing natural cooling breezes. Step-by-step Explanation: Let us evaluate each strategy within the context of Indian climates:
• Thick Masonry Walls (Option A): This strategy provides high thermal mass, which is highly effective in hot-dry regions. High thermal mass absorbs heat during the day and delays its transfer into the building interior, keeping indoor spaces cooler during peak daytime temperatures.
• Shading Devices (Option C): External features like concrete chajjas, overhangs, and louvers block direct solar radiation before it hits window glass, preventing greenhouse heat trap effects inside rooms.
• Courtyard Planning (Option D): Courtyards act as natural cooling engines by inducing convective air currents (the stack effect), pulling cooler air through the building while venting warm air out the top.
• Air-Tight Joints (Option B): Creating hermetically sealed windows is a construction technique used in cold, heating-dominated climates (such as Northern Europe or North America). It prevents cold outdoor air from leaking inside and retains mechanically heated indoor air. In India's warm, humid climate zones, sealing buildings completely prevents necessary natural cross-ventilation, making it an inappropriate and uncommon strategy. Thus, air-tight joints do not align with standard passive design practices in India.