How to calculate Server Power (in watt, BTU)

I am calculating BTU of air conditioner for our server room. There are 30+ servers in the server room. Most of them have redudant power supply. For example, if a Dell 2950 server has 2 x 700 W power supply (from server specifications), how much watt of this server need? Do I need to consider peek time or running time?

Thanks,
vijitcAsked:
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michkoCommented:
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jamietonerCommented:
If they are all dells (or you have the btu and power info from the non-dell devices) you can use dell's rack advisor program to calculate btus and max power usage.
http://support.us.dell.com/support/downloads/download.aspx?c=us&cs=04&l=en&s=bsd&releaseid=R91359&formatcnt=1&libid=0&fileid=119636 
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nobusCommented:
you can try to calculate thepower needed for each server  here :
http://extreme.outervision.com/psucalculator.jsp      
or use  a watt meter, to measure each one's power consumption :
      http://www.the-gadgeteer.com/review/kill_a_watt_electric_usage_monitor_review
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vijitcAuthor Commented:
What could be real power consumption if I have 2 x 700W deduandant power supplies running? How can I find that?
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michkoCommented:
APC while paper for calculating total cooling requirements of your data center:
http://www.apcmedia.com/salestools/NRAN-5TE6HE_R1_EN.pdf
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nobusCommented:
you cannot calculate it starting from the power supply - that is only max power that you can use.
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