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  1. #1

    how to maximize air flow from the AHU during blackout?

    I am working in a supermarket which is located in the basement area of the mall. We've been experiencing blackout this past few days but we had our generator working. The problem is, the AHU (air handling unit) in our supermarket will only run its blower during blackout. Since the supermarket is located in the basement area, we could still experience heat and lack of cold air. Is there any way of improving the air flow in our supermarket? any techniques like using blocks of ice and place it near the AHU in order for the AHU to absorb cold air from the ice something like that?



  2. #2
    Join Date
    Jul 2009
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    In a mechanical room....
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    You could get a rental unit such as a chiller and evap to rig up if you are on a chilled water loop if not without serious modifications you may or may not a tech would have to look at the system to see what your options are.

  3. #3
    Join Date
    Sep 2008
    Location
    Cedar Rapids, IA
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    487
    Is your AC condensing unit your own or is cold air supplied by the mall? If the AC equipment is yours, I'ld rent a generator big enough to run your whole store if possible, if not at least your ac unit. Best to have the plans for this laid out before a blackout, but if you are going to be out for several days you could get something going.

    I worked for a hospital in Florida when hurricane Andrew hit. Our emergency plans called for bringing in a skid mounted generator and temp wiring it into the hospitals distribution on the 2nd floor. The generator itself had a spot picked out for it on the 2nd floor parking deck. Everything was pre-arranged with the rental company. We had 24hr contact numbers and a letter of agreement that they would provide a 1 megawatt generator with 1000 gal of fuel within 4 hours of our call. We also had letters of agreement with local electrical contractors, etc. Our agreement with the local lumber yard was that we could bypass any lines and have first call on plywood and other supplies.

    We never needed the generator during the storm our built in unit worked fine and we didn't have any significant flooding. But we were ready. The generator was transfered to another hospital a day after the storm. The other hospital's generator room flooded and shorted out the gen set. They went black until ours arrived.

    We had a bad blackout here in Iowa a couple of years ago, and we assisted Walmart hooking up a tractor trailer mounted generator that arrived about 3 hours after the blackout. They do not have a built in generator but they do have a contingency plan.

  4. #4
    Join Date
    Jan 2010
    Location
    New Orleans metro area
    Posts
    161
    Quote Originally Posted by bob_scheel View Post
    Is your AC condensing unit your own or is cold air supplied by the mall? If the AC equipment is yours, I'ld rent a generator big enough to run your whole store if possible, if not at least your ac unit. Best to have the plans for this laid out before a blackout, but if you are going to be out for several days you could get something going.

    I worked for a hospital in Florida when hurricane Andrew hit. Our emergency plans called for bringing in a skid mounted generator and temp wiring it into the hospitals distribution on the 2nd floor. The generator itself had a spot picked out for it on the 2nd floor parking deck. Everything was pre-arranged with the rental company. We had 24hr contact numbers and a letter of agreement that they would provide a 1 megawatt generator with 1000 gal of fuel within 4 hours of our call. We also had letters of agreement with local electrical contractors, etc. Our agreement with the local lumber yard was that we could bypass any lines and have first call on plywood and other supplies.

    We never needed the generator during the storm our built in unit worked fine and we didn't have any significant flooding. But we were ready. The generator was transfered to another hospital a day after the storm. The other hospital's generator room flooded and shorted out the gen set. They went black until ours arrived.

    We had a bad blackout here in Iowa a couple of years ago, and we assisted Walmart hooking up a tractor trailer mounted generator that arrived about 3 hours after the blackout. They do not have a built in generator but they do have a contingency plan.
    During my 11 yrs at a New Orleans area hospital . We had a rental chiller program similiar to this. Also had a mobile potable water program .Our plant had an electric boiler for O R support. We during OAT 48 degrees and below used a waterside economiser as well .We had enough gensets ( 2-500kw, 2-900 kw and 1-1200 kw units ) .

  5. #5
    Ill get some pictures for you to see later. thanks

  6. #6
    Join Date
    Jul 2009
    Location
    In a mechanical room....
    Posts
    1,888
    You could just call a company like aggreko...

    http://www.aggreko.com/northamerica/

  7. #7
    Join Date
    Sep 2008
    Location
    Cedar Rapids, IA
    Posts
    487
    Most refrigeration cases require temperatures to be below 75 degrees and humidity below 45-50% in the area outside the display case. If you can not maintain those numbers then you are at risk of losing or not refrigerating your product properly.

    Your business insurance might cover the cost of the equipment in order to avoid you closing and having to pay for lost revenue and/or a lawsuit over spoiled food / food poisoning.

  8. #8
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,922
    Quote Originally Posted by bail View Post
    I am working in a supermarket which is located in the basement area of the mall. We've been experiencing blackout this past few days but we had our generator working. The problem is, the AHU (air handling unit) in our supermarket will only run its blower during blackout. Since the supermarket is located in the basement area, we could still experience heat and lack of cold air. Is there any way of improving the air flow in our supermarket? any techniques like using blocks of ice and place it near the AHU in order for the AHU to absorb cold air from the ice something like that?


    In my experience, it is unusual for a supermarket to run anything mechanical during a power outage.

    Power goes out, store shuts down is kind of the drill around here. Most have just exit lighting connected to the generators.

    Yes, without HVAC, your refrigeration isn't going to work well, but without power, it isn't running at all, so HVAC is a minor issue comparitively.

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