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Type: Posts; User: davebab

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  1. Replies
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    Polar Bear Heat Loss?

    I'm working on a load calculation for a new Polar Bear facility going up in a zoo. There are six bear holding rooms and am not quite sure how much heat loss Polar Bears produce.

    Any help would...
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    That is agreed. However, there will also be...

    That is agreed.

    However, there will also be a heat loss when the sterilizer is opened from the other room. Say the sterilizer is done cleaning the tools, and someone goes to open it up right...
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    Sterilizers / Autoclaves

    Hello, I have a question regarding heat loss for a sterilizer/autoclave. I am looking at a cut sheet for an AMSCO Century medium steam sterilizer 26" x 37.5" - North America. I see that the loss...
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    There is a dedicated outside air unit supplying...

    There is a dedicated outside air unit supplying the outside air, so the air is heated.

    The furnace is serving a laboratory, with hood exhaust. Your explanation has answered my question.
    ...
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    motorized and volume dampers

    Would there be any issues with putting a motorized damper and a volume damper in the same outside air duct? I am working on a project that requires both, and have them both shown on the same outside...
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    hospital atrium design question

    I am designing the ductwork for a hospital expansion project and I have been in somewhat of a predicament with the atrium. There is a 34'-0" ceiling height and there are murals on opposite sides of...
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    Outside air cfm load

    I am in the process of calculating the load that 70540 cfm of outside air would create.

    Would I use this formula?
    Q=cfm x delta T x 1.08

    Also, for the delta T, that would be the temperature...
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    Aluminum Windows

    I am doing a load calculation on an existing building and the windows are being called out as "Aluminum Window". Does this mean that the frame is Aluminum? I wouldn't understand why there would be...
  9. Thread: Turning Vanes

    by davebab
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    Actually I am the engineer (ok maybe not the...

    Actually I am the engineer (ok maybe not the engineer, but designer). The only reason I was asking is because at my previous place of employment, we never put turning vanes in return air duct. We...
  10. Thread: Turning Vanes

    by davebab
    Replies
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    4,883

    The system is not very complex. There's a plenum...

    The system is not very complex. There's a plenum return in a retail space and just a vertical return duct dropping down from the rooftop unit, turning so the duct is running horizontal and then...
  11. Thread: Turning Vanes

    by davebab
    Replies
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    4,883

    Turning Vanes

    Are turning vanes required for return air elbows?
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    Intake Relief hood selection

    I am selecting an intake hood (having no previous experience doing so) for an air handler pushing 6000 cfm. I hope this isn't a stupid question, but do I select the hood for the amount of outside...
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    Series Fan Powered Box or Parallel?

    I'm working on a project where there is a space that requires a VAV box. I am using a fan powered box. There is a medium pressure supply main to tap into to get air to the box. How do I know if I...
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    Yes, this clears things up a lot. So if I just...

    Yes, this clears things up a lot. So if I just added the area of the partitions of the restrooms in the load, instead of adding new zones for the restrooms (which the boss doesn't like doing),...
  15. Thread: too many kw's

    by davebab
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    1,361

    Well thank you. The problem actually got worked...

    Well thank you. The problem actually got worked out. The old owner had been working on the thermostat and the other electrical componets before he sold the house. The house sat vacant for several...
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    Yea we use HAP software and there are three...

    Yea we use HAP software and there are three sections to add in safety factors. We always add 10% in all three.

    They are Cooling Sensible, Cooling Latent and Heating.

    I pretty much follow...
  17. Thread: too many kw's

    by davebab
    Replies
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    1,361

    Thanks for the help, I will pass this info along...

    Thanks for the help, I will pass this info along and hopefully he can get this worked out.
  18. Thread: too many kw's

    by davebab
    Replies
    14
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    1,361

    too many kw's

    A buddy of mine just purchased a home with a Ruud Central H&A. His thermostat is set on 78 and his first power bill was $800.00 this month. He measured his meter for the first 12 hours with the AC...
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    Please explain more...

    Please explain more...
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    Not dishwasher exhaust, there's a steamer in the...

    Not dishwasher exhaust, there's a steamer in the stock room of a commercial retail store and an exhaust fan serving the steamer sized at 400 cfm.
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    exhaust duct sizing with steam..

    Does exhaust air get sized differently if it is exhausting steam? I'm working on a job where there is an exhaust fan sized at 400 cfm that will be exhausting steam. I have it sized at 10x10, but...
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    Thanks for the responses, this helps a lot. I...

    Thanks for the responses, this helps a lot. I know the importance of load calcs, but it just seems like there's so much you can do to change things around to how you like them, or to meet certain...
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    OK thanks. Thats what I thought. I work with a...

    OK thanks. Thats what I thought. I work with a guy who thinks that everything should be at 250 square foot per ton. I can't seem to break him on this either. He does load calcs, then he just...
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    over-sizing units...

    I was just curious to know if there is a rule of thumb for square feet per ton, or does that depend on the location, or what? Generally I go by what the load summary's tell me, but I know some HVAC...
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    Transition question

    Which would be most efficient, a round branch duct tapping out of the bottom of a round duct, or a round branch duct tapping out of the bottom of a rectangular duct? It's in a plenum, so looks do...
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    Carrier HAP load calc question

    How would I include 1" spandrel glass with a dark bronze skin as a window type in the carrier HAP program? The windows are in the fitting rooms of a retail store we're doing.
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    Sorry about the delay in response, but I meant to...

    Sorry about the delay in response, but I meant to add that the showroom area I was referring to was located at the front of the store. There were windows on one side, for people walking by to see,...
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    10 ton condensing unit (Trane)

    Anyone know if there is a Trane condensing unit that matches a Trane Air Handler model #TWE120A4? I can't seem to find one anywhere...
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    ok thanks. Yea we use them mostly for display...

    ok thanks. Yea we use them mostly for display areas of retail stores. I'm asking because one of our customers says that we designed their store like a hospital, but I'm not sure why as we don't do...
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    There is a specific tenant.

    There is a specific tenant.
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    linear slot diffusers

    What is the most common use for this type of diffuser?
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    I didn't explain that too well, there is a supply...

    I didn't explain that too well, there is a supply main which runs straight for awhile, then it could either have a branch off, followed by an elbow, or there could be a t-split in which the ducts...
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    cost of transitions

    Is there some type of catalogue that shows costs of different types of transitions? Basically I'm trying to figure out if a t-split would be cheaper than a branch off followed by an elbow. All of...
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    Also, I have just switched jobs. I came from a...

    Also, I have just switched jobs. I came from a consulting firm where we did much larger jobs than I am doing now, and we always used t-splits instead of branch ducts. The only branch ducts we ever...
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    Retail store HVAC design

    I was laying out the ductwork for a retail store and there came a point where a T-split would be the most logical transition (in my mind anyways) to use. However my boss told me that for most retail...
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    It is an existing balcony of a church. Now its a...

    It is an existing balcony of a church. Now its a mezzanine. I am going to use two panels for the louver, as they only manufacture single panels up to 96"x96". The active louver will be 70x47 and...
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    Yea I managed to figure some of this out using my...

    Yea I managed to figure some of this out using my AWV graphs. It was pretty much the exact same page that you posted.

    I came up with a free area of 11.08 sq ft and a velocity of 187 ft/min. ...
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    AWV model LE-21.

    AWV model LE-21.
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    Yes, the manufacturer is AWV. I don't understand...

    Yes, the manufacturer is AWV. I don't understand how to get the correct minimum free area, knowing that the opening is going to be 70x47.
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    Louver selection question

    I have an existing opening of 131" x 47" where there used to be windows. The windows are going to be replaced by a louver. The louver size is 131x47, but we are only going to use 70 inches of the...
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