mass transfer

Question 1

A gas holder - n H20/n Nitrogen =?

Answer 1

n H20/n Nitrogen = 0.0352

Question 2

Mix of Benz Vap and Air - weight frac of benz:

Answer 2

weight frac of benz: 0.2301

Question 3

Mix of Benz Vap and Air - molal humidity:

Answer 3

molal humidity: 0.1111

Question 4

Mix of Benz Vap and Air - absolute humidity:

Answer 4

absolute humidity: 0.2989

Question 5

Mix of Benz Vap and Air - % sat:

Answer 5

% sat: 70.67%

Question 6

Mix of Benz Vap and Air - % rel. sat.:

Answer 6

% rel. sat.: 73.62%

Question 7

Mix of Benz Vap and Air - mass of air:

Answer 7

106 kg or 95.4 kg

Question 8

Air at 101. 3 kPa has dry bulb - heat supplied in kJ per kg of dry air:

Answer 8

heat supplied in kJ per kg of dry air: 66.28 kJ/kg

Question 9

Air at 298 K, final temp:

Answer 9

final temp: 15 C

Question 10

In a process in which benzene - pressure of gas to be compressed:

Answer 10

pressure of gas to be compressed: 344.22 kPa

Question 11

0.6 m3/s of gas - vol of gas after drying:

Answer 11

vol of gas after drying: 0.5571 or 0.591

Question 12

Air at 101.3 kPa enters an adiabatic drier - kg of finished product:

Answer 12

kg of finished product: 8.37 kg

Question 13

Saturated air leaving - spec. humidity:

Answer 13

spec. humidity: 0.0122

Question 14

Dry air is bubbled - how long til water vaporize:

Answer 14

how long til water vaporize: 67.8 days

Question 15

A batch drier removes water - how long will the total drying require:

Answer 15

how long will the total drying require: 13.9 hr

Question 16

A wet solid is dried - how long will (ks) it take to dry the solid:

Answer 16

how long will (ks) it take to dry the solid: 28.44

Question 17

Wet material - how much air will be reqd to remove moisture:

Answer 17

how much air will be reqd to remove moisture: 3.77 kg/s OR 3.68

Question 18

A solid is dried at cons drying conditions - time needed to dry the solid from crit moist:

Answer 18

time needed to dry the solid from crit moist: 5 hrs

Question 19

Moist air is found - temp to dry from 40% to 5%:

Answer 19

temp to dry from 40% to 5%: 6.95 hr

Question 20

What will be the volumetric flowrate

Answer 20

volumetric flowrate: 12.65 ft3/min OR 700 m3

Question 21

In a batch drying experiment - mass of dry solid per unit area:

Answer 21

mass of dry solid per unit area: 35

Question 22

Drying of a sample - how long to dry sample to free moist:

Answer 22

how long to dry sample to free moist: 5.77 hrs

Question 23

Around airports - dew point:

Answer 23

dew point: 20.5 C