The GATE Grind

GATE 2024 AR — Planning – Question 37

Climatology and Environmentally Responsive Design · Thermal comfort in built environments · 2 marks · Multiple select

Which statements are true?

  1. Physiological equivalent temperature assesses outdoor thermal comfort.
  2. Thermal performance index uses the envelope’s outside surface temperature.
  3. Reynolds number below 2000 denotes laminar flow.
  4. Reynolds number above 4000 denotes turbulent flow.

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Show answer and explanation

Correct answer: (A) Physiological equivalent temperature assesses outdoor thermal comfort.; (C) Reynolds number below 2000 denotes laminar flow.; (D) Reynolds number above 4000 denotes turbulent flow.

Explanation

PET is used for outdoor human thermal comfort(A). The source’s conventional Reynolds thresholds are below 2000 for laminar and above 4000 for turbulent flow(C, D); they are context-dependent engineering thresholds, not universal atmospheric boundaries. TPI is not defined by the stated outside-surface-only measure. Select A, C, D.

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