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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.
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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)
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