Sources of Moisture Emission

Moisture control in industrial buildings is necessary to avoid problems related to 

The permeation moisture load through building materials can be calculated using 

The amount of water evaporated from wet surfaces (i.e., process equipment, floors) or water tanks, M, kg/h, is proportional to the difference in vapor pressure between the surface and air, the surface temperature, and the air velocity across the water surface  

If the water temperature is held constant and the water is still, Table 7.7 can be used to evaluate the temperature of the water surface (at room air temperature 20 °C and RH = 70%). When the water is stirred, the surface temperature can be assumed to be equal to the mean water temperature. 

430 CHAPTER 7 PRINCIPLES OF AIR AND CONTAMINANT MOVEMENT INSIDE AND AROUND BUILDINGS 

---