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  1. #1
    Join Date
    Dec 2003
    Location
    Edgewater, NJ
    Posts
    88
    We are looking into cooling a small computer room on the weekend while the building A/C is down. Total load is currently 9000 BTU and will ultimately reach 12000. The room has a supply and return off the main system. The building uses a plenum return.

    We are considering two options. The first is a spot cooler with exhaust into the plenum. The second is a 1-ton mini-split.

    The spot cooler would cost roughly one-third what the mini-split would; however, our HVAC contractor has raised the issue of potential structural problems to the roof from dumping the heat into the ceiling without the main system running. Our building manager isn't sure it's safe, either.

    If we need to install venting, the cost would rapidly approach the mini-split's. We own the building.

    Thanks for any comments.

  2. #2
    Join Date
    Jan 2004
    Posts
    389
    Tell your contractor he full of crap, I have many spot coolers in operation at various sites doing just what you want. Spot coolers are your best option.

  3. #3
    Join Date
    Jan 2002
    Posts
    247
    They can cause all sorts of problems,in concrete buildings they can heat the slab above on a weekend shut down, if any common returns are nearby the heat can "roll" back into the space, They can put a load on an already taxed air handler for that floor by dumping extra heat, but its only a ton of extra air. People install them and don't maintain and the floats get stuck and flood, or the condesate line, if it pumps, gets bent/kinked.They usually use the air they have cooled for condenser air, so the room goes neg. drawing in outside the room air thats probably 85, or put that crappy second tube to pull the 100 degree air you are discharging back in. There are reasons most class a buildings only allow them for temp. situations i.e., if a tower goes down, system maint., etc. If you plan on staying any length of time go for the ductless mini, or a Liebert M/M, but hey, to each his own.
    Two wire hook up, three wire f**k up.

  4. #4
    Join Date
    Jan 2004
    Posts
    389
    ZeroCool, I guess you havent been in the HVAC field too long, You dont have a clue of what your talking about. Spot coolers have been around a long time and never caused any problems that you claim. GET REAL DUDE!!

  5. #5
    Join Date
    Feb 2004
    Posts
    534
    I agree with Bku spot coolers are no big deal, Every setup is not the same so it may not work for you but I have setup alot for emergency cooling usually I can make it work. Miket I would think about some backup cooling for your server room main system goes down you have some protection I think mini split is a wise choice it's a one shot deal are you going to rent a spot cooler everytime the AC is shutdown the mini split will pay for it self after 3 or 4 shutdowns. I'm not a salesman I'm giving you my honest opinion.

  6. #6
    Join Date
    Jul 2000
    Location
    Dallas,Texas
    Posts
    4,948
    The spot cooler requires the condensate tank to be emptied and takes up valuable floor space.
    Invest a little more in the mini split and you will be happier to have it on the roof and out of the way.

  7. #7
    Join Date
    Jan 2002
    Posts
    247

    Red face

    Burger King Uniform waist size 46 is always right. Put in a unit for permanent operation that is listed as Temporary/Portable cooling. Why put in a split system in your house when you can use a window shaker like he has in his 14x60 double wide trailer. Speaking of Dudes, shouldn't you be picking a fight with one at the trailer park you live in for hitting on your baby's moma, DUDE. Get real, mall electrician. Miket, do yourself a favor, call another commercial installation company, get a second opinion and get them to permit the job to make sure its up to code. If thats what you want, then give it a try.
    Two wire hook up, three wire f**k up.

  8. #8
    rubobornot Guest
    Real Cheap = Spot Cooler

    Real effective = Mini Split with condensing unit in plenum

    Really the Right way = An actual computer room system with the condenser outside or a water cooled condenser inside.

    I just worked at a place that claims to have $250,000 invested in a server room that they are trying to cool with a spot cooler, never works right but all they do is complain that they can't afford the server to go down. And they don't want to spend 3-4 % of that total investment to cool the room right, why shouldn't the cooling equipment for a room of that nature be looked at the same way as the equipment it is trying to cool?

  9. #9
    Do a search for renting a spot cooler. Since this is temporary .... the expence is a 100% write-off.

  10. #10
    Join Date
    Jan 2003
    Location
    San Jose, Ca
    Posts
    2,089
    He is tlking about a perminate not temporary insulation. that will run onloy on week ends.

    If it will work will depend on building. I use to work in a set of high rise buildings and on a emergency situation we have used spot coolers. Some with sucess so with failure.

    One of the failures was a large server room with a water source heat pump and demising walls on all sides. The discharge from the spot cooler was into the cieling return air plentumn. Because the condencer fan was pulling air from the room through the condencer to the cieling and back to the room it did not work. On the first day the temperature was OK. but by the second day it would begin to climb, by the third day it was better when the spot coller was turned off. The sorry thing was I could never convince the regioal engineer this was happening. His solution was to put in more spott coolers.

    Class A buildings do not allow tenants to use them for a different reason. If the tenant wants 24/7 cooling they will have to put in a AC unit for the server room with a electrical meter. The landlord does not want to pay for the cooling twice and therfore will require the tenant to remove any spott coolers.
    Old snipes don't die they just loose their steam

  11. #11
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,242

    Question Reliable

    Originally posted by rubobornot

    Really the Right way = An actual computer room system with the condenser outside or a water cooled condenser inside.

    ... why shouldn't the cooling equipment for a room of that nature be looked at the same way as the equipment it is trying to cool?
    Miket,

    Do you require a RELIABLE A/C system?

    IF Yes, READ complete post by RUBBOORNOT.

    Do you require an ABSOLUTELY Reliable system?
    If Yes, consider Liebert and electrical generator.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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