Guest TheScullster Posted October 2, 2008 Posted October 2, 2008 Hi all I am looking at locating 5 servers on a rack in a 2m x 2m cupboard. The heat load seems rather high to me - can anyone comment please? Looking at the specs for the various kit, they quote Btu/hr figures. The new servers give 3990 Btu/hr and the old ones (to be re-used) 1850 Btu/hr. Are these figures the actual dissipated heat that needs to be removed via the air-con or is there some sort of service factor (reduction) to be applied. Allowing for some future contingency I get a conservative figure of approx 30,000 Btu/hr. From my DIY experience, this is enough to heat a small house!! Any advice on the size and type of air-con unit appropriate would be appreciated. TIA Phil
Guest Pegasus \(MVP\) Posted October 2, 2008 Posted October 2, 2008 Re: Cooling Server Room "TheScullster" <phil@dropthespam.com> wrote in message news:ZJGdnSL3FNI15HnVnZ2dnUVZ8v3inZ2d@eclipse.net.uk... > Hi all > > I am looking at locating 5 servers on a rack in a 2m x 2m cupboard. > The heat load seems rather high to me - can anyone comment please? > > Looking at the specs for the various kit, they quote Btu/hr figures. > The new servers give 3990 Btu/hr and the old ones (to be re-used) 1850 > Btu/hr. > Are these figures the actual dissipated heat that needs to be removed via > the air-con or is there some sort of service factor (reduction) to be > applied. > > Allowing for some future contingency I get a conservative figure of approx > 30,000 Btu/hr. > From my DIY experience, this is enough to heat a small house!! > > Any advice on the size and type of air-con unit appropriate would be > appreciated. > > TIA > > Phil I'm not sure what exactly you mean with "The new servers give 3990 Btu/hr". The general rule is: If you put a device consuming 10 kW inside a well insulated room then your air conditioning plant has to be capable of removing 10 kW of power (or 10 kWh of energy per hour). You can therefore ask your electrician use his energy meter to measure the total active power consumption of all devices in your server room. The result will determine the size of your air conditioner. Make sure he measures Watts, not VAs! By the way, where do they still use BTUs?
Guest Richard Mueller [MVP] Posted October 2, 2008 Posted October 2, 2008 Re: Cooling Server Room "Pegasus (MVP)" <I.can@fly.com.oz> wrote in message news:em7jshJJJHA.1304@TK2MSFTNGP02.phx.gbl... > > "TheScullster" <phil@dropthespam.com> wrote in message > news:ZJGdnSL3FNI15HnVnZ2dnUVZ8v3inZ2d@eclipse.net.uk... >> Hi all >> >> I am looking at locating 5 servers on a rack in a 2m x 2m cupboard. >> The heat load seems rather high to me - can anyone comment please? >> >> Looking at the specs for the various kit, they quote Btu/hr figures. >> The new servers give 3990 Btu/hr and the old ones (to be re-used) 1850 >> Btu/hr. >> Are these figures the actual dissipated heat that needs to be removed via >> the air-con or is there some sort of service factor (reduction) to be >> applied. >> >> Allowing for some future contingency I get a conservative figure of >> approx 30,000 Btu/hr. >> From my DIY experience, this is enough to heat a small house!! >> >> Any advice on the size and type of air-con unit appropriate would be >> appreciated. >> >> TIA >> >> Phil > > I'm not sure what exactly you mean with "The new servers give 3990 > Btu/hr". The general rule is: If you put a device consuming 10 kW inside a > well insulated room then your air conditioning plant has to be capable of > removing 10 kW of power (or 10 kWh of energy per hour). You can therefore > ask your electrician use his energy meter to measure the total active > power consumption of all devices in your server room. The result will > determine the size of your air conditioner. Make sure he measures Watts, > not VAs! By the way, where do they still use BTUs? > If it helps, I believe: 1 KW = 3413 btu/hr -- Richard Mueller MVP Directory Services Hilltop Lab - http://www.rlmueller.net --
Guest TheScullster Posted October 2, 2008 Posted October 2, 2008 Re: Cooling Server Room "Pegasus (MVP)" wrote > > > I'm not sure what exactly you mean with "The new servers give 3990 > Btu/hr". The general rule is: If you put a device consuming 10 kW inside a > well insulated room then your air conditioning plant has to be capable of > removing 10 kW of power (or 10 kWh of energy per hour). You can therefore > ask your electrician use his energy meter to measure the total active > power consumption of all devices in your server room. The result will > determine the size of your air conditioner. Make sure he measures Watts, > not VAs! By the way, where do they still use BTUs? > Thanks Pegasus What I mean is that the data sheets covering power in the quick specs for the existing and proposed servers include a Btu/hr figure. For the ML350 G3 servers this figure is described as the BTU rating. For the proposed 3000VA UPS, there is a similar entry described as On Line Thermal Dissipation in Btu/hr. The use of Btu as a unit suggests heat transmission, but the total figure I have of 30,000 Btu/hr for proposed and future contingency apparatus in the server room appears high (and also that it would need a serious air-con system to cope)! At present our servers are in the open office (albeit 2 in cabinets). With heat output like that suggested above I would expect people to keel over if they were in the vicinity. Phil
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