[Bldg-sim] IES VE Dehumidification Question

[Wealend, Edwin]

Kevin,

Depending on your system, if you've got high levels of infiltration in a high humidity area, large latent loads within the spaces etc. downstream or room RH could potentially be high. Otherwise, if it's not meeting the off-coil RH, either you've got a profile issue (your coil is effectively off) or some part of your system is undersized. You'll need to interrogate step by step to find the issue.

Taking Chris' point further ApacheHVAC doesn't 'look' at any value from your Room Conditions tab. In that respect it's a dumb beast. It's up to you to make sure the room conditions and setpoint controllers within ApacheHVAC match, so that your loads and your coil/airflow sizing tie up.

Hope that helps,
Ed

Edwin Wealend
Senior Engineer

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From: Kevin Campbell [mailto:Kevin.Campbell at megroup.com]
Sent: Friday, February 15, 2013 06:39
To: Chris Yates
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] IES VE Dehumidification Question

I'm using all prototype systems, and they all have humidity controllers attached to the coil/room when imported.  Looking at those controllers they have a setpoint of 50% RH with a 10% deadband.  I don't know if that's standard with the prototype systems or if it's pulling that from my room conditions tab, but either way everything seems to be pointing to 50% RH.


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KEVIN CAMPBELL, EIT, CxT

ANALYST

t: 402.464.3833 x2129

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From: Chris Yates [mailto:chris.malcolm.yates at gmail.com]
Sent: Thursday, February 14, 2013 4:21 PM
To: Kevin Campbell
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] IES VE Dehumidification Question


Difficult to diagnose from your description but certain zone level system settings become redundant when you use aphvac.

Are you using the controllers in aphvac to control humidity via coils or are you expecting aphvac to the "find" settings in your zone "room conditions"tab?

It's not always obvious what settings become redundant.

Sent from my Android device. Please excuse typos, etc.
On 14 Feb 2013 14:16, "Kevin Campbell" <Kevin.Campbell at megroup.com><mailto:Kevin.Campbell at megroup.com>> wrote:
Building Simulation Community -

I'm having issues with humidity in some models I'm running while trying to use ApacheHVAC. I have set my "Maximum Percent Saturation" to 50%, and in the VE ASHRAE Loads Results Data tab of the loads data spreadsheet it shows that max input as 50%. If I go into Vista and highlight my "filename.asp" file for the run that is linked to my ApacheHVAC system and run the "Heating and Cooling Report" and look at the "Comfort - Occupied" section all of my rooms have a Max% Relative Humidity of 85-100%. This is the same if I select "Systems" from the drop down and investigate Relative Humidity on a node by node basis at the rooms in my ApacheHVAC system.

Rooms in my model that are not assigned to an ApacheHVAC system and are left with the default ApacheSystems system show that they are being maintained at 50% RH.

All rooms whether assigned to the ApacheHVAC systems or the default systems show that they're letting room temperatures float to Unoccupied setpoints during the "Comfort - Occupied" times.

Any help on this would be greatly appreciated, the buildings I'm trying to work on are located in Louisville, KY and Tampa, FL so not accounting for dehumidification is going to vastly effect the cooling load.

Thanks,


[Element Logo 4-27-12.png]<http://www.megroup.com/>

KEVIN CAMPBELL, EIT, CxT

ANALYST

t: 402.464.3833 x2129<tel:402.464.3833%20x2129>

WE'RE ON OUR JOURNEY TO GREENBUILD 2012!<http://www.megroup.com/index.php/greenbuild2012>

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