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? |
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 |
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:
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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. Ken |
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 |
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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