[Equest-users] maximum humidity limit

[Zheng Ling]

Hi Dave, I feel you go too far. I think the cooling coil will deal with any latent load if it exists and not very big. Setting bigger RH range will not change Energy consumption. Let me know your idea.

ZHENG LING, P.Eng.
Mechanical
 
Williams Engineering Canada Inc.
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-----Original Message-----
From: David Griffin [mailto:dgriffin at etcgrp.com] 
Sent: Wednesday, January 09, 2013 2:29 PM
To: 'Amruta Khanolkar'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] maximum humidity limit

Amruta,

I'm glad to hear you are still modeling in eQuest. I hope everything else is going well.

To address your question, there are several things to consider.

1) If your building is not 100% OA, you may want to check your user input latent loads since this humidity will show up in your return air stream.
2) Are you modeling your outside air correctly?
3) If your building is 100% outside air, your climate may not be humid enough to merit dehumidification.
4) I doubt it is this, but make sure your cooling coil bypass factor is defaulted.
5) Lastly, consider viewing the following reports to get a better understanding of how your model is dealing with humidity on a system level.
	SS-I
	SS-N
	SUPL

I hope this helps.

Thanks,

David Griffin
Energy Analyst
ETC Group, LLC
801.278.1927 ext. 128
Cell 480.235.0899
Fax 801.486.0668
dgriffin at etcgrp.com


1997 South 1100 East, Suite 201, Salt Lake City, UT 84106-4471 - www.etcgrp.com
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-----Original Message-----
From: Amruta Khanolkar [mailto:askhanol at asu.edu] 
Sent: Wednesday, January 09, 2013 1:23 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] maximum humidity limit

Hi all,

I am working on a preservation facility project in eQuest. Because of the specific type of the building, keeping temperature and humidity constant all throughout the year is of high importance. This project also has desiccant system for dehumidification. Due to eQuest's capacity I have modeled the entire building except the desiccant system in eQuest. So right now the dehumidification load is on the cooling coil. The maximum and minimum humidity levels are 45% and 35% respectively. I just wanted to remove the maximum humidity limit (no
dehumidification) and increase it to 80% or 90% just to study the dehumidification load on the cooling coil. I was expecting the cooling energy consumption to go down compared to the original consumption after I remove/increase the max humidity limit but surprisingly my numbers don't change at all. Am I missing something here?

Thanks,
Amruta