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

If DBT = 30°C, WBT = 20°C and Barometer reading is 740 mm of Hg. Find out vapor density using steam tables. Correct Answer 0.01216 kg / m3 of dry air

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 Specific humidity = W = 0.622 pv / pb – pv = 0.622 x 0.01701 / 0.98642 – 0.01701 = 10.914 g / kg of dry air ρv = W (pb – pv) / Ra Td = 0.010914 (0.98642 – 0.01701) 105 / 287 (273 + 30) = 0.01216 kg / m3 of dry air.

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