GATE 2022 AR — Architecture – Question 65
A room has wet-bulb temperature 25°C, globe temperature 30°C and air speed 0.5 m/s. By how many °C does Tropical Summer Index decrease when speed becomes 3 m/s? Round to two decimals.
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Correct answer: -2.20 to -1.50 OR 1.50 to 2.20
Explanation
Use TSI=0.745tg+0.308tw−2.06√v+0.841. The two temperatures stay fixed, so the decrease is 2.06(√3−√0.5)=2.11138°C, or 2.11°C. As a signed change, final minus initial is−2.11°C. The final key explicitly accepts either sign in its two disjoint intervals, which are preserved for grading.