APC InRow ACSC101 Placement

[BillP]

This question was originally posted by warifir on APC forums on 9/10/2013

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Dear Folks,

Please let me know can we place apc InRow ACSC101 infornt of Racks??? Please see attached file, In the layout ACSON Floor Standing CRAC are being shown. Our customer would like to re place their CRAC by InRow ACSC101. Therefore I need to confirm can we place ACSC like this??? If yes then what should be the minimum & maximum distance from the racks.

Query is very urgent. Kindly help.

Thanks

Regards,

War

[BillP]

This reply was originally posted by Angela on APC forums on 9/10/2013

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L2SupportServices-Cooling - is this something you could help with?

[BillP]

This reply was originally posted by L2SupportServices-Cooling on APC forums on 9/10/2013

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Hello Warifir,

Unfortunately this unit is not designed to be used as a perimeter cooler. The ACSC100 unit is designed to be in row with the devices it is meant to cool. In short the unit is designed to send cold air out the front of the unit, have this air be drawn in by the surrounding equipment which will heat up the air and be sent out the back of the equipment rack, then drawn into the back of the cooling unit. Because of this airflow pattern, the unit will not be overly effective in the corner or sides of the room. If the customer is willing to redesign and move their equipment to accommodate the units, however, they would work fine.

In regards to finding a solution for this room as it stands, however, are the blue spots in from the the racks air vents from a raised floor? If so, we may have some other solutions you can pursue. Please let me know, and if you have any questions, also please feel free to ask. Thank you.

[BillP]

This reply was originally posted by warifir on APC forums on 9/11/2013

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Dear Sir,

If we change the position of 5 racks as you see in the layout, So, the Cold aisle will be developed in between 7 racks and the 5 racks. Therefore is it beneficial to have cold aisle between two rows of racks with ASCS cooling? OR we need to shuffle both rows (5 & 7 racks) and have hot aisle between???

Further, Yes the blue spots are perforated tiles, 1.5 ft raised flooring. I will be very happy for your suggestion for any other solution. So that we can compare and quote both ACSC and some other stuff to the customer and winning chances would be high.

I am waiting for your valuable response.

Thanks.

War

[BillP]

This reply was originally posted by L2SupportServices-Cooling on APC forums on 9/11/2013

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Hello warifir,

I would generally recommend having it so that the two rows share a common hot isle, so that way the heat is contained and all the units draw from the same heat source. This will generally help in increasing the efficiency of the cooling unit's as well. What would also be preferable would be to make the rows the same length as well. This will help ensure better airflow. While I am not equipped to help properly size your cooling needs completely, below should be a good example of how to lay out this room, if possible. Think of this diagram as an overhead view, with "R" being an equipment rack, "U" being a cooling unit, and the common hot isle being the space in the middle.

RURRURR

Hot isle

RRURRUR

While there are many factor to designing a space properly, this setup could provide even cooling to the equipment, and depending on how dense the equipment racks are, you have a selection of a variety of units that could work.

The other solution I was thinking of was that you would keep using a perimeter cooling unit (which is what appears it being used now), but consolidate all the cooling units in the room into one unit. We now offer a variety of perimeter direct expansion cooling units in our Uniflair product line, which you can view here. The Uniflair units can be used with raised floor tiles like the current setup is, though reorganizing the room and ducting the return air for higher efficiency it still something I would recommend.

I know I breezed over a few topics there, so if you have any questions regarding this, please feel free to ask. Thank you.

[BillP]

This reply was originally posted by warifir on APC forums on 9/11/2013

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Dear Sir,

Thanks a lot for  your valuable suggestion. What a great response!

Surely, We would suggest the customer that the racks should be placed in a way that the rows would share a common hot aisle.(But it would required a little more work to move the positions of both rows of the racks). If you can assist me in the following two questions I would be very much thankful to you. Just give me some idea so that I would quote at least two different options to the client. (common hot aisle option is confirmed),

1. If I leave the existing setup as it is which you can see in the layout (the L-Shape setup of 5 & 7 racks) and accommodate four units of ASCS101 (by removing some racks) then howz that? what you think would it work fine???

2. To prevent from a more local work and I just move 5 racks row so that a common cold aisle would be used by both rows than is it OK.

and yes FYI,

Total Load is 13-14kVA.

Total Racks are 12, consuming 1-1.2kVA, each rack.

Room size is 20 x 20 ft

Duct work is present

As you have cleared my query 95% by your expert advice. Now only 5% is remaining. You people provide me a confidence thanks a lot Sir.

Waiting for your valuable response.

Regards,

War

[BillP]

This reply was originally posted by L2SupportServices-Cooling on APC forums on 9/11/2013

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Hello warifir,

Your very welcome! As for your remaining questions:

1: If you wish to keep the current room layout, you should be able to make it work. I would generally try to have at least 2 or three racks between the two cooling units (assuming 2 per row, which would be adequate).

2: A common cold isle would be fine as well.

Just as a side note, I would recommend having no more than 4 units in this space with that kind of load. As always, if you have any questions, please just let me know. Thank you.

[BillP]

This reply was originally posted by warifir on APC forums on 9/12/2013

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Dear Sir,

Superb reply from your side. Which clarified everything for me. Thank you so much Sir for this wonderful support.

Regards,

War

[BillP]

This reply was originally posted by warifir on APC forums on 9/30/2013

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Dear Sir,

How are you? hope fine and doing great...

I have an urgent query regarding the above matter. As you know we have two flexible exhaust ducts and one Intake duct with ACSC101 unit. So, Please let me know the most appropriate place of placing these ducts specially the Intake duct. Can I elongate all three ducts to outside means in open air? If yes then what will be the ambient temperature requirement?

Please help me out on this..As you always did. Waiting for your response.

Regards,

War

[BillP]

This reply was originally posted by L2SupportServices-Cooling on APC forums on 9/30/2013

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Hello warifir,

I am doing well, and I hope the same goes for you as well. In regards to your question, all ducting is supposed to be run to building plenums; the intake duct to a supply plenum, and the exhaust ducts to the return plenum. In the event that the ducts cannot be run to plenums, then the exhaust can be run outside, and the intake can take in air from a drop ceiling or, in extreme cases, outside air. If you would like, I can email you a white paper regarding the requirements for the ACSC ducting air. In brief, the exhaust tubes must go to a space outside of the room that is being cooled where the heat can escape, and the intake tubes must take in relatively clean air that is between 32-105 degrees Fahrenheit (preferably around room temp). If outside air is being used, a filter should be added to the ducting, which is not something we offer.

In regards to the ducting length, you can extend the tubes as needed, but must add booster fans to maintain proper CFM in the tubes, which should be 850cfm. Aside from that, ducting length should be kept to a minimum to avoid heat "bleeding" through the tubes and back into the space being cooled. If you have any questions, or would like that white paper, please let me know. Thank you.

[BillP]

This reply was originally posted by warifir on APC forums on 10/1/2013

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Dear Sir,

Your detailed answer clarified almost every thing, This explanation " In the event that the ducts cannot be run to plenums, then the exhaust can be run outside, and the intake can take in air from a drop ceiling or, in extreme cases, outside air" has made my day.

I will be very happy if you email me the white paper regarding the requirements for the ACSC ducting air.

Further, please let me know are you talking about Inline booster fan? if yes, then will these fans be installed in all three ducts (two exhaust and one intake). Also, 850 cfm is common for all three ducts? I know this could be a childish question, but actually i wanna understand each and everything.

Sir, I am truly thankful to you for your great help and cooperation.

Regards,

War

[BillP]

This reply was originally posted by L2SupportServices-Cooling on APC forums on 10/1/2013

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http://www.apc.com/prod_docs/results.cfm?DocType=App+Note&query_type=99&keyword=&fam_id=&wpnum=109

Hello. I have added the link to apc.com where the application note on the ACSC100 is. This is application note 109 - Application Guidelines for the InfraStruXure InRow SC Condenser in case the link has issues. The 850 cfm is for all three ducts. For the outside air to the intake, in ideal conditions it can take air from 32-105 but in real world conditions the air should be between 65 and 95 degree F. Also make sure there is some kind of filtering of the intake air otherwise the condenser coil and fans will become blocked up with debris. This will cause the unit to stop working. If you have any other questions please let me know. Thank you

[BillP · Accepted solution]

This reply was originally posted by warifir on APC forums on 10/2/2013

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Thank you Sir,

Every thing is clarified. Thanks a lot.