【Daily Question】Production, Storage, and Transportation – 20190728
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One question per day on the production, storage, and transportation version; 5 wealth points are awarded for correct answers； Effective participation grants 2 units of wealth ； Extra points will be given to those who provide a reasonable explanation first. Multiple-choice question: For moist air with an air temperature of td, humidity of Hd, and relative humidity of Φd, after passing through a preheater that uses indirect steam heating, the air’s temperature becomes t1, its humidity becomes H1, and its relative humidity becomes Φ1. Then ( ) (A) H1 > Hd (B) Φd > Φ1 (C) H1 < Hd (D) Φd < Φ1 (B) Φd > Φ1
Answer～(B) Φd＞Φ1