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If DBT = 30°C, WBT = 20°C and Barometer reading is 740 mm of Hg. Find out DPT using steam tables.

If DBT = 30°C, WBT = 20°C and Barometer reading is 740 mm of Hg. Find out DPT using steam tables. Correct Answer 35°C

For given conditions, pressure corresponding to WBT from steam table is pw = 0.02337 bar pb = 740 mm of Hg = 740 x 133.3 / 100000 = 0.98642 bar Pressure of water vapor = pv = pw – = 0.02337 – = 0.01701 bar For 0.01701 bar water vapor pressure, dew point temperature is 15°C.

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