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DCO :there is imbalance of airflow in the ceiling plennum

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DCIM_Support
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DCO :there is imbalance of airflow in the ceiling plennum

This question was originally posted on DCIM Support by Christopherus Laurentius on 2016-02-19


Hi Team,

I got this error when trying to generate calculated value for cooling.

Thoughts?

Setup:

Cold Aisle Containtment
Raised floor w/ perforated tiles

Racks ducted to ceiling for hot air return

Downflow CRAC, ducted to ceiling

Dropped ceiling enabled 

 

(CID:105466100)

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Re: DCO :there is imbalance of airflow in the ceiling plennum

This comment was originally posted on DCIM Support by Jef Faridi on 2016-02-22


Hi Christopherus, By looking at the capture, it is hard to say what might be the issue, but apparently there might be an airflow imbalance. Would it be possible to share a copy of your backup file with me, then I will take a look, thanks. Kind regards

(CID:105466197)

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Re: DCO :there is imbalance of airflow in the ceiling plennum

This comment was originally posted on DCIM Support by Christopherus Laurentius on 2016-02-22


Hi jef, I've sent you an email for the DCO ip address. Feel free to have a look and/or get the backup data. Just a request not to show the customer's name on the forum. Regards, Chris

(CID:105466199)

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Re: DCO :there is imbalance of airflow in the ceiling plennum

This comment was originally posted on DCIM Support by VSales on 2016-02-22


Hello Christopherus, Generally speaking an imbalance would indicate that the CFM entering the room doesn't match the amount of CFM exhausting from the room. Please calculate the amount of ari entering and exhausting from the data center, if they do not match then correct either entering or exhausting air follow to make them match. Thanks Victor

(CID:105466264)

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Re: DCO :there is imbalance of airflow in the ceiling plennum

This answer was originally posted on DCIM Support by Jef Faridi on 2016-02-22


Hi Chris,

Many thanks for providing the data - it seems basically you need to add Perforated Ceiling Tile(s) to the setup. As illustrated, by adding at least one Perforated Ceiling Tile, it is possible to run the calculated cooling simulation:

Hope this helps,

Kind regards

(CID:105466270)

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Re: DCO :there is imbalance of airflow in the ceiling plennum

This comment was originally posted on DCIM Support by Christopherus Laurentius on 2016-02-22


Hi Jeff, I tried your solution. It does not seem to be correct as well. When I put 6 x 2kW server on 1 of the rack, the temperature plane does not change. Also the airflow in your picture seems to indicates all hot air returning to the perforated ceiling, instead of each of the ducted rack's 'chimney' One more thing, on the 1 row cold aisle containment (row1 & 8), how do we close the other side of the containment where there is no rack?

with load.JPG

(CID:105466275)

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Re: DCO :there is imbalance of airflow in the ceiling plennum

This comment was originally posted on DCIM Support by Jef Faridi on 2016-02-24


Hi Chris, As scheduled we'll talk about this over the call today.

(CID:105466508)

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