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Cool Air + Moving Air = Effective Temperature Calculations

Air movement on individual workers makes a big impact on cooling effect


Effective Temperatures:

Effective temperature is influenced by several factors, among these are:


*Air Temperature

*Air Moisture level

*Air Movement.

For example if our scenario is a warehouse in Phoenix:


Outside:  108ºF and 13% relative humidity


Ventilation System assume an air movement of 50 feet per minute (fpm)


Effective temperature =  84ºF


Direct Portable Evaporative Cooler


Supply Air Temperature =  78ºF


Effective Temperature =  71.5ºF at 200 fpm


Effective Temperature =  68.5ºF at 500 fpm


(Effective Temperature material used: 1999 ASHRAE Applications Handbook page 50.6)

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