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Old 01-14-2012, 03:08 AM
gabak gabak is offline
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Question how do i know how much a/c btu power i need for a datacenter

I have a room with 35 meters square and two and half meters tall
38 servers. working 80%cpu usage.
How much cold do i need for the a/c to keep cool everything?
I have a complete list of models of every server. much heat do they produce?
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Old 01-14-2012, 02:18 PM
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KenB KenB is offline
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Hi and welcome to the forums. To get a rough estimate of how much cooling capacity you need, measure the current on every electrical circuit supplying power to the racks. Total amps x voltage x 3.413 = BTUs.

For actual requirements, an engineer familiar with data centers will consider other factors that affect cooling -- including rack layout, air flow, CRAC placement, humidity, your uptime needs, etc. -- and design a complete cooling system.


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Old 01-16-2012, 03:43 AM
gabak gabak is offline
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thank you so much for your answer.
here i got a list of all servers and they are working at 220 volt. i dont know the amps.
i had been looking for the consume and hp site does nt say anything

433527-001 HP DL380R05 E5310 US Svr
397629-001 HP DL380G4 2.8/800-2M DC US Svr
397629-001 HP DL380G4 2.8/800-2M DC US Svr
397629-001 HP DL380G4 2.8/800-2M DC US Svr
311143-001 DL380R04 X3.4/800-1M US
370596-001 DL380R04 X3.2/800-1M US
458567-001 HP DL380R05 E5420 2G Base US Svr
400607-B21 HP ML370T05 SAS CTO Chassis
372710-001 DL320R03 P3.4/800-2M 1GB A1 PRC US
372710-001 DL320R03 P3.4/800-2M 1GB A1 PRC US
397629-001 HP DL380G4 2.8/800-2M DC US Svr
452291-B21 HP DL580R05 CTO Chassis
397629-001 HP DL380G4 2.8/800-2M DC US Svr
397629-001 HP DL380G4 2.8/800-2M DC US Svr
435456-B21 HP BL460c G1 E5310 1G 1P Svr
435456-B21 HP BL460c G1 E5310 1G 1P Svr
435456-B21 HP BL460c G1 E5310 1G 1P Svr
435456-B21 HP BL460c G1 E5310 1G 1P Svr
435456-B21 HP BL460c G1 E5310 1G 1P Svr
397629-001 DL 380 G4
433527-001 DL 380 G5
416770-001 ML 150 G3
397629-001 DL 380 G4
417454-001 DL 380 G5
308724-001 DL 360 G3
411243-B21 BLc SB40c Storage Blade
372710-001 DL 320 G3
400607-B21 ML 370 G5
507864-B21 BL 460 G6
583914-B21 DL 380 G7
A4869B HP 9000 K380 Server Solution
A5576A HP 9000 L1000 Enterprise Server Solution
AG718B EVA4100
AD132A rx6600 2 CPU Base System
583967-001 DL 380 G7
583914-B21 DL 380 G7
583914-B21 DL 380 G7
579237-B21 DL 360 G7
579237-B21 DL 360 G7
AG115A MSL2024 Ultrium 960
BK829A Storage Works P2000


thank you in advance for your help

Quote:
Originally Posted by KenB View Post
Hi and welcome to the forums. To get a rough estimate of how much cooling capacity you need, measure the current on every electrical circuit supplying power to the racks. Total amps x voltage x 3.413 = BTUs.

For actual requirements, an engineer familiar with data centers will consider other factors that affect cooling -- including rack layout, air flow, CRAC placement, humidity, your uptime needs, etc. -- and design a complete cooling system.


Ken
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Old 01-16-2012, 03:08 PM
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KenB KenB is offline
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Quote:
Originally Posted by gabak View Post
thank you so much for your answer.
here i got a list of all servers and they are working at 220 volt. i dont know the amps.
i had been looking for the consume and hp site does nt say anything

Go to the HP site and type POWER CALCULATOR into the search box. The reason I recommend measuring the circuit currents instead of doing calculations is that measurement will include actual power being delivered to all equipment, including non-servers, networking gear, office equipment, etc.


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Old 01-16-2012, 11:32 PM
vincent_byrne vincent_byrne is offline
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Gabak


The best way to get total accuracy reading of the load is to do as KenB has recommended.
Here are some options for getting accurate readings of existing equipment in a live data centre.
Option : Take a power reading at the existing UPS
Option 2:Take a power reading at each PDU in the each rack if you have Amp readings on your PDU's.
Option 3 : Get a electrician to measure the loads on the circuits at the distribution board and be sure to include the A and B loads.
Option 4 :Use a meter that can measure the load by clamping the the flex cable into the PDU. (Note these can be inaccurate.)

We have spreadsheets which you can use to pump in the basic IT loads, floor areas etc and you get a minimum cooling capacity requirment in BTU's or kw.
I have had a look at your schedule of equipment and from our data sheets for this equipment we have come up with a server power load requirement of 39kw (nameplate).
This does not include for the reduction associated with lower utilisation and with the other elements of equipment in the room whioch will also give off a heat load like the lighting, UPS, Distribution boards, people, and potential loads due to windows etc.

Dependent on the airflow arrangement you choose ie, under floor, overhead, with cold or hot aisle containment the cooling solution you choose will have to derated to allow for inefficiency. After this is allowed for you then need to consider if future expansion is required in the design. This maybe installed at a later date but must be considered in the layout. Then you add on your redandant unit to achieve N+1(this must be installed now)

It would also be interesting to see how many racks you intend putting this amount of equipment into. If the load in any one rack is too high you will have problems cooling it adequately in a small room with a limited head height. At 35sqm the room is very small and it will be difficult to install cooling units in this small footprint and achieve redundancy.
In this type of room anything above about 4/5kw and you will need to look at the posability of a closed couples solution such as inrow.

Is the 2.5 meters from slab to slab or from raised floor to dropped ceiling. Note you will need to decide if you can deliver the air from above or below. It probably makes sense to use some king of aisle containment method as you have a rather dense load in a small area.
I do not see any connectivity equipment, Cisco, Juniper etc. Will this be accomodated in a differnet room or must it also be added to these totals.


I am going to attach some links for you to download some usefull tools form my website.

1 A cooling layout design guide. "30 Data centrte cooling templates"
To download go to
www.vincent-byrne.com
and put your details into the form on the right hand column. You will reveive a download link in your email.

2 Here is a direct link to visio document with all of the templates from the design guide.
You can use one of these tmplates to decide on a suitable layout.
http://www.vincent-byrne.com/workshops/design_workshop/

For any more help feel free to contact me at
vincent@byrnedixon.com

Vincent
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  #6  
Old 01-17-2012, 01:20 PM
vincent_byrne vincent_byrne is offline
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gabak

Firstly I recommend that you do as suggested by KenB and get a site measurement for the power requirement.
This can be achieved using one of the following methods.
1. Read the power at the UPS
2. Measure the power at the PDU's (If PDU's have amperage displayed)
3. Measure the power on each circuit using a clamp meter on each circuit cable within the distribution board.
4. Use a meter to clamp the single phase flex cable feeding the PDU's as it enters the rack. (Note these can inaccurate)

I have looked at the schedule of Servers an compared to our specification sheets and calculated the load at 39kW (nameplate)
You must now do some work with this figure.
Step 1 Diversify for 80%CPU usage.
Step 2 Add for any additional power load in room, such as connectivity equipment, Cisco, Juniper, etc
Step 3 Add for additional heat loss in room. (People, lighting, UPS heat losses, etc, solar heat gain due to windows if there are any)
Step 4 Add for future expansion if necessary.
Step 5 Depending on airflow method (underfloor, overhead, with or without containment) you will need to add for inefficiency
Step 6 Add for redundancy to achieve N+1

Precautions.
In a room of this size you will only be able to fit a small number of racks therefore the layout and the position of the CRAC units will be important. Possibly keep the CRACs at one end.

I have an eBook of data centre templates complete with CFD modelling.
The eBook is called "30 data centre cooling templates".
Go to www.vincent-byrne.com
and fill in the details in the right hand side and yu will receive a download link in your email.

I have also got a Visio version of these templates, you can use them to play around with the layouts.
http://www.vincent-byrne.com/workshops/design_workshop/

If you need any more assistance just email me at
vincent@byrnedixon.com

Vincent
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