AW's two AC units cost no more than $85-100 max per month to run.
On 23 August 2012 13:45, Mark Jenkins <m...@parit.ca> wrote: > On 23/08/12 01:33 PM, Justin Lacko wrote: >> >> One of our electrical bills came in and caused a bit of an issue with >> the owner, Marvin - it was $2500 and they are assuming a very large >> portion of that is our floor. > > >> (the server room is probably >> costing us around $300/mo. to run). > > > > Before someone jumps to a "OMG computers have to be kept off!" purge, let's > allow some math to give us some perspective. > > 400 watt is your max use of typical low end PC. > > Off course, they don't pull that all time when powered on unless doing a > crazy indefinite load. > (folks with crazy indefinite loads should host elsewhere BTW...) > > And of course, server equipment can draw much more at peak...and I don't > know how much when idle.... > > But whatever, the question I want to answer here is, what is the daily > operating cost for a 400 watt anything. Change that constant if you like. > > > A kilo-watt hour is around 8c these days? > > A kilo-watt hour is the amount of energy used by a kilo watt device in an > hour. Kilo watt means 1000j/s. > > That means you pay 8 cents for > 1000 * 60 * 60 = 3600000j > > Convert to joules per dollar > 3600000/0.08 = 45000000j / $ > > > ------------- > > Now, how many joules used in a day by a 400watt device? > 400j/s * *60*60*24 > 34560000 j/day > > So, the daily, direct electricity cost of a 400watt device is: > 34560000 j/day divided by 45000000j / $ > = $0.77 > > > The 30 day cost of 10 such devices is: > 0.77*10*30 > = 231.0 > > Hmmm, I guess it does add up.... > > > But the whole manufacturing / vs office thing is a silly distraction given > that there's nothing at all unusual about our activities compared to any > other office taking up this much floor space. > > It's not unusual for offices this big to have three refrigerators running > (drink machine is one). It's not unusual for an office taking up this much > floor space to have many PCs and other devices on all the time. If we blew > out all the walls and made this place a friggen engineering or call centre > cube farm there could be a lot more PCs on all the time. > > Any normal office would have spent way *more* on electricity to attain a > reasonable temperature and level of lighting. > > I don't think we can simply thumb our noses and ignore the complaint either. > We don't want our landlord to say we're in default and tell us the lease is > terminated. Even if we're right, we don't want to have that fight in court. > > Better to be defending ourselves now. (and not just saying sorry and putting > ourselves into the dark ages) > > Our number of always-on devices (electronics, refrigerators, lights) are > reasonable for the amount of overall space compared to other offices. The > amount of heat put out by those devices is reasonable. > > The big change from last summer and this winter is the increased watts of > air conditioning units. We should present the math on how much juice * price > of electricity those take to operate. > > (Anyone know how many watts for these things?) > > If indeed we can show that electricity costs are high due to increased air > conditioning power being in place, than the landlord needs to understand > that the thermal properties of his building are the biggest factor driving > said air conditioning, not our activities / devices. > > Once we get electrical distribution on the floor improved, we're probably > going to consuming *more* power for air conditioning next summer than this > one. On one hand we're probably have more efficient units in place, but on > the other hand we're probably going to want the entire floor to be > reasonable instead of just a few spots. > > To be rent-able as office space, the place has to be habitable as office > space. > > > The tough thing long term we may have choose -- pay office space levels > rents to have office level comfort and amenities or pay storage grade rents > and get storage grade comfort and amenities. > (this trade-off would apply elsewhere too) > _______________________________________________ > SkullSpace Discuss Mailing List > Help: http://www.skullspace.ca/wiki/index.php/Mailing_List#Discuss > Archive: https://groups.google.com/group/skullspace-discuss-archive/ _______________________________________________ SkullSpace Discuss Mailing List Help: http://www.skullspace.ca/wiki/index.php/Mailing_List#Discuss Archive: https://groups.google.com/group/skullspace-discuss-archive/
