WBGT is used to guide decisions about shading, ventilation, and material choices to maintain occupant comfort. Which is correct?

• A. Shading, ventilation, and material choices to maintain occupant comfort.
• B. Only the color of interior paint.
• C. Lighting layout only.
• D. Landscape plant selection only.

Answer: (A)

WBGT guides how the built environment handles heat by considering heat gain from sun, humidity, air movement, and radiant heat. To keep occupants comfortable in tropical settings, you design around shading, ventilation, and material choices. Shading reduces the amount of solar radiation entering and heating surfaces and spaces. Ventilation moves air to remove heat and increase evaporative cooling, which lowers indoor temperatures and improves comfort. Material choices influence how much heat is absorbed and stored by building surfaces—think reflective or light-colored finishes, low-absorption materials, and appropriate thermal mass to moderate temperature swings. Together, these elements directly affect heat load and occupant comfort, which is why this option is correct. The other choices are too narrow: interior paint color alone doesn’t address heat gain and ventilation; focusing only on lighting layout ignores thermal aspects; and plant selection alone covers shading but not ventilation or material impact.