[Equest-users] 90.1-2007 Pressure Drop Adjustments - Indirect Evaporative Cooler

[Greg Garcia]

Fellow modelers,

I'm looking for your interpretation on which types of evaporative cooling devices qualify for the Fan Power Limitation Pressure Drop Adjustment (Table 6.5.3.1.1.B).
I'm modeling a three stage evaporative cooling system (IDEC) popular to the Salt Lake City area.  I'm unsure whether to claim credit for the Indirect Evaporative Cooling
Coil (IECC).  The IECC device has a design pressure drop of 0.75" w.g..   Taking credit for the IECC device leads to significant fan savings which is great for LEED points and
Utility incentives.  The 90.1-2007 User Guide does not clear this up for me either.


Three Stage IDEC system Details:
Each device in series

1.       Zero Stage = Air-Side Economizer

2.       First Stage = Indirect Evaporative Cooling Coil (IECC), uses cooling tower water pumped through a coil

3.       Second Stage = Direct Evaporative Cooling Media, pumps water directly over a cellulose evaporative media

4.       Third Stage = Chilled Water Coil, centrifugal chillers simulated to run less than 300 hours per year



Gregory F. Garcia
Energy Engineer
ETC Group, LLC
801.278.1927 ext. 111
801.556.0564 (Mobile)
ggarcia at etcgrp.com<mailto:ggarcia at etcgrp.com>


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Energy Engineering for a Sustainable Future
1997 South 1100 East, Suite 201, Salt Lake City, UT 84106-4471 - www.etcgrp.com<http://www.etcgrp.com/>
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