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.

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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

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