humidification quantity calculation formula：M=P×Vn×(d2-d1)×n
① M- needed humidification quantity of workshop （㎏/h）.
② P- The proportion of dry air is 1.19㎏/m³ .
③ Vn- The new air that into the workshop or number of air change per hour in workshop * workshop area.(m³/h)
Not sealed workshop is 3 times of the volume.
④ d2- The absolute humidification in workshop.
It means ××kg moisture per kg dry air （㎏/㎏）.
For example, reach 60% relative humidity all over the year, check the psychrometric chart,come to d2=0.0126㎏/㎏
⑤ d1-Absolute humidity of outdoor （㎏/㎏）. For example,6℃ is coldest in Huizhou area,
relative humidity is 18%,check the psychrometric chart,come to d1=0.001㎏/㎏
⑥ n-safety factor, it is related to the number of equipment and staff in workshop.Normally n=1.3
The needed humidification quantity accordingly :M=1.19㎏/m3×6000m3/h×(0.0126㎏/㎏-0.001㎏/ ㎏)×1.3=100㎏/h
So the model of humidifier is 100KG/h
Clean one-way valve