Add to that, consumer units are not intended to run 24x7 and are selected for supplemental cooling, not the primary cooling of massive heat-generating environment.
*ASB *(My XeeSM Profile) <http://XeeSM.com/AndrewBaker> *Exploiting Technology for Business Advantage...* * * Signature powered by WiseStamp <http://www.wisestamp.com/email-install> On Tue, Aug 10, 2010 at 4:48 PM, Raper, Jonathan - Eagle < [email protected]> wrote: > David, > > > > I just read your original post and realized that you’re considering a > consumer grade HVAC unit. I would recommend against this, and here’s why: > > > > It is true that a BTU is a BTU but that is where the comparison ends. > > > > 1. According to someone I know in the industry, the smaller throw away > units (aka, consumer grade) average a 75% per year return rate. So, > literally 7 out of 10 are returned. The average unit comes back 3 times. > 2. There are basically two types of the throw away units: a single > vented system and a two vented system. > 1. The single vented units wouldn't cool a 2x2 foot bathroom. They > are sucking out the cold air through the side of the unit as quick as > they > are pumping cold air into the room. Thus you can't lower the air > temperature > if you are pulling out all of the cold air as quick as you are putting > it > into the space. > 2. The two vented units do work, however they typically never even > come close to hitting the warranty period. Supposedly the norm from the > dozens and dozens of Chinese companies that manufacture these units is > no > reply to this, so the warranty does little good anyway. This is > particularly > true if they are being used in a commercial environment, as that > typically > voids the warranty (for consumer grade anything) anyway. The reason they > don’t last is that their total ducting capability is only 12 feet. Any > HVAC > technician can tell you when you put a 90 degree elbow on the ducting > material it is equivalent to 8 to 10 feet of duct run. So, by the time > they > reach the 8 foot drop ceiling they are well beyond 12 feet of duct run – > possibly 30 feet or more. It strains the compressor, thus driving up the > amperage requirement and kills the unit. > > > > Finally, with the type of digital thermostat that typically comes on those > units, even with auto restart, you typically lose the programmed settings > once power is out longer than 30 seconds. In doing so, you are putting your > server room/nerve center in harms way 16+ hours a day during a regular work > week, and longer if you aren’t staffing on the weekends. Aside from that, it > is difficult, if not almost impossible to get replacement parts for those > units. > > > > It is entirely possible that you could go through a dozen consumer grade > units by the time a good quality commercial portable cooling unit dies. > > > > Hope this helps, > > Jonathan L. Raper, A+, MCSA, MCSE > Technology Coordinator > Eagle Physicians & Associates, PA* > *[email protected]* > *www.eaglemds.com > ------------------------------ > > *From:* David Mazzaccaro [mailto:[email protected]] > *Sent:* Tuesday, August 10, 2010 3:51 PM > > *To:* NT System Admin Issues > *Subject:* RE: Portable A/C for computer room? > > > > Interesting points. > > Yes, the Mr. Slim is a ductless unit. > > > > So I assume during extended power outages, most people run a generator to > their existing AC unit? > > I also assume that would require an electrician to hard wire something > outside the building? Sounds like a much better solution to me. > > > > > > > > > ------------------------------ > > *From:* N Parr [mailto:[email protected]] > *Sent:* Tuesday, August 10, 2010 3:41 PM > > *To:* NT System Admin Issues > *Subject:* RE: Portable A/C for computer room? > > And don't forget they have to be properly vented. And the for all the CFM > in hot air it vents to the outside of the room somewhere it's going to > create negative pressure and suck warmer air from outside the room, above > the ceiling tiles, etc. So you will have to overcome the temperature > increase caused by that in addition to the BTU's your gear is creating. > 11000 BTU isn't really a lot when you start adding things up. You may be > better off putting your Mr Slim, which I assume is some type of ductless > system, on the generator and not worry about secondary cooling. > > > ------------------------------ > > *From:* John C Owen [mailto:[email protected]] > *Sent:* Tuesday, August 10, 2010 2:22 PM > > *To:* NT System Admin Issues > *Subject:* RE: Portable A/C for computer room? > > HI David, > > > > We have used portable A/C units in the past. You would need to purchase a > unit that has a way to pump the water out instead of collecting in a > condensation cup > > > > Our only issue was when the cup filled up, the unit shut off and the room > of course got hot. > > > > Good Luck. > > > > > > [image: cid:[email protected]] > > *John C Owen* > > Systems Administrator > > Foto Fantasy Inc > > 8 A Industrial Way > > Salem, NH 03079 > > Direct: 603.459.0623 > > Fax: 603.879.9003 > > Cell: 603.498.2627 > > > > [image: Legally Green] > > > > > > This email and any files transmitted with it are confidential and intended > solely for the use of the individual or entity to whom they are addressed. > If you are not the intended recipient, be advised that you have received > this email in error and that any use, dissemination, forwarding, printing, > or copying of this email is strictly prohibited. If you have received this > email in error, please notify the sender, and delete it from your system. > Any views or opinions expressed in this email are not necessarily those of > Foto Fantasy Inc. E-mail transmission cannot be guaranteed to be error-free, > secure, or free from viruses, and Foto Fantasy Inc. disclaims all liability > for any resulting damage, errors, or omissions. > > > > > > > > *From:* David Mazzaccaro [mailto:[email protected]] > *Sent:* Tuesday, August 10, 2010 3:11 PM > > *To:* NT System Admin Issues > *Subject:* Portable A/C for computer room? > > > > I am looking for suggestions on a portable air conditioner for my server > room. > Room is 9' x 13' and currently has a Mr. Slim AC unit in it. > In the event of a power outage, I am planning on using a portable generator > to run a portable AC unit to keep things cool. > > From what I've seen on Lowes.com and other places, 11,000 BTU units are > under $500. > Any thing else I need to look for when getting one of these? > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
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