Selecting the Right Fan or Blower for Your Application 
Sizing of fans and blowers is similar in process to that of pumps, where graphs are commonly used. The performance graph is usually a constantspeed plot with capacity on the X axis and a variety of performance factors on the Y axis. As part of the selection process, a graph of the system is also generated, with capacity as the X axis and head (energy loss in the system) on the Y axis. 

Wet Bulb Temperature Equation 
The wetbulb temperature, Twet, is a common humidity variable (e.g., Schwerdtfeger 1976, p 50ff.). A wetted thermometer will read lower than the ambient air temperature because of evaporation (but higher with condensation), and that rate of evaporation depends on the mixing ratio. 

Fluid Mechanics and Machinery 
The flow of ideal nonviscous fluids was extensively studied and mathematical theories were developed during the last century. The field of study was called as ‘Hydrodynamics’. However the results of mathematical analysis could not be applied directly to the flow of real fluids. 

