cooling tonnage versus ambient temp
Does anyone have links to information about relative energy efficiency of split-system datacenter cooling at different ambient air temperatures? For example, the difference between cost of keeping a datacenter at 65F versus 75F?
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Perform calcs as below to find your loads. Dropping sensible load to 65 will lower your humidity which may require humidification. It depends on how you want to operate. Bottom line, the more energy you use to condition your space, the more expensive your costs. The upside to keeping your space at 65 is you have created a heatsink during cooling failure. May only be 30 minutes or so, but may be enough time to correct a minor problem.
Below taken and edited from RSES SAM Manual..... (www.rses.org) Is = Np x Fs + Lw x 3.41 + Lf x 4.25 + NM x HP x 3393 + As where: Is=sensible internal heat gain, Btu/hr Np=number of occupants Fs=occupancy heat gain, sensible, Btu/hr Lw=electric lights, incandescent, watts LF=electric lights, fluorescent, watts NM = number of electric motors HP = motor HP As=appliance heat, sensible, Btu/hr IL=NP×FL+AL where: IL=latent internal heat gain, Btu/hr FL=occupancy heat gain, latent, Btu/hr AL=appliance heat gain, latent, Btu/hr Use actual or assume a fluorescent lighting load of 1.5watts per sq ft of floor space. Use actual or assume (For FS and FL) 250 and 200 Btu/hr per person respectively. |
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Ken |
Yes, you're right if the fans die....I was obviously not clear....my apologies
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Actually, in the simulation it didn't much matter if the CRAC fans die or not -- the difference was only a few seconds. The effect happens at the rack level. Here's a whitepaper on it (registration required :mad: ): http://www.upsite.com/TUIpages/downl...Cooling_WP.pdf
Ken |
Thanks for the info...it will help in my presentations....JC
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