temperature activated switch/outlet

[wowiesy]

Sa pagkakaintindi ko, the objective is to maintain the temp of the server room at the least cost possible.

If you are willing to experiment pa (which may or may not be costly but definitely time consuming also), there are a few information / data that we will need in order to be able to determine the most cost efficient way of doing this:
1. temperature range of the room - during weekdays na may work talaga w/ ahu on (min / max), during weekends na walang work (ahu off), during weekends na may mangilan ngilan na nag wo work

2. existing AHU capability - if its a basic aircon (na window type or split type) or if it is an industrial type AHU

3. possible result of using an exhaust fan and a high velocity blower on the temperature range of the server room during weekends of no work / minimal work...

If I will assume na ang AHU ay ordinary airconditioning (split type o window type)... i'll first get temperature readings to get the actual temperature range na no ahu, no work... if the room is really isolated from ambient temperature then mas simple ang data gathering.. but kung ordinary room sya and hindi insulated from other rooms, we have to take into account the relationship of ambient temperature versus the server room temp...

Anyway, as far as control components, you'll definitely need a thermocouple, temperature controller analog (cheaper) or pid (a little more expensive).. pinaka mura dito i think is kung gagamit na lang ng blower / fan sa room, then alalayan ng exhaust fan... the blower / fan will blow directly to the server equipment to remove the hot air in the components... then alalayan ng exhaust to dump the hot air outside the room...

sa ganitong setup, it can keep your server room temp stable but ang possible problem is the blower and the exhaust would have a difficult time bringing down the temp kapag mataas din ang ambient temperature sa labas.. in this case, kung talagang critical, baka kailangan na automatically on yung AHU for a 1 - 2 hours na naka preset na yung temp.. just to bring down the temp faster... then after the ahu is turned off... bayaan mo uli yung fan / exhaust combination to do its work.. kapag tumaas uli beyond the control of the fan / exhaust, papasok uli yung AHU... dito papasok kung anong klaseng AHU yung gamit.. if its the window type / split type aircon.. susceptible sya sa sira kung madalas ang patay sindi (bukod sa malakas sa kuryente pag frequent on / off) so you may have to set the temp on a wider range... kung industrial AHU naman na kaya yung more frequent on and off.. I guess uubra yung plano above..

sa server room namin, we have 2 servers (naka dual cpu, with 4 raid disks), 2 servers na clone machine lang, data cabinet (with the backbone switches)... minsan pag hindi nabubuksan yung aircon sa room, the room temp goes up as high as 35C... yung mismong casing ng servers umiiinit din... tinatapatan ko lang ng fan (yung 3d na parang industrial air circulator).. yng mismong mga servers.. iniiwan ko bukas pinto ng room para lumabas yung hot air... then napapa baba na nya yung temp ng room...

if you need further help on the details.. just drop me a note.. baka makatulong pa ako...