Effective Temperatures

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)

 

PDF Download: Effective Temperatures - Airflow Influences

Effective Temperatures ASHRAE Chart
 
 

Copyright (c) 2008 . All Rights Reserved