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Recent content by MarauderX

  1. MarauderX

    Heat Pump COP Calculation

    ARI tests are done at certain temperatures to compare units apple-to-apples. You can also check with the manufacturer on the EER performace characteristics. You may be able to get the exact performace given the temperatures you are using. This will be different from ARI, as it will be giving...
  2. MarauderX

    Merits of 4 fps flow

    Thanks for the responses thus far. There is a lot of piping for the building, as this is a geothermal project of about 1500 tons. We are sizing the piping up from 12" to 16", and the branch piping is typically 4" for as little as 27 GPM. It seemed a little arbitrary to size all of the...
  3. MarauderX

    Merits of 4 fps flow

    Currently we are designing condenser water piping (40-90 degrees F water) to be flowing at 4 feet per second or less. Sure it is great for acoustics, but the piping ends up being upsized a lot along the way, and it will cost more. Another senior engineer is insisting this method of design...
  4. MarauderX

    Primary/Secondary flow issues?

    Will there ever be a problem with primary pumps overwelming the secondary pumps? The only condition I can think of is that the bypass isn't large enough and there is little demand on the secondary.
  5. MarauderX

    Data Center Temperature

    I've been looking at HP's Dynamic Smart cooling. Any thoughts on using this to control each rack to what you need or equipment requirements? www.eypmcf.com
  6. MarauderX

    latent loads in locker rooms

    Gepman is right, you shouldn't be worried about treating the latent loads in a locker room, you should be exhausting it. If you increase the exhaust rate by increasing the fan speed (if it can do it) and rebalancing the system to exhaust more from the locker room. You might consider ducting an...
  7. MarauderX

    Happy Thanksgiving to All HVAC/R memebrs

    And a good Thanksgiving to you too! www.eypmcf.com
  8. MarauderX

    Geosource Heating

    For this system, I would place structural supports for the frame to be connected to. You don't want it to just rest there, as it will drift away. Slopes can be deceiving, and I wouldn't trust one just because it is underwater. To drop it down slowly I would use a crane. Provide connections...
  9. MarauderX

    Data Center Temperature

    Yeah, thought I'd get more attention from the Comp Eng group on the air temperature here. Good to know that a leaving temp of 95 from the server/room would not be a major problem. I know that at a certain point elec equipment runs less efficiently due to temp, and it only gets worse as it...
  10. MarauderX

    Can a heat transfer surface be too slick?

    In short, yes, you can have a surface that is too slick. As you probably know a film will develop to prevent transfer that would be as good. While it can be a good thing for things such as sterile environments, it can be not-so-good for heat exchangers. www.eypmcf.com
  11. MarauderX

    Data Center Temperature

    Hey, does a warmer operating data center make you nervous? We are looking at providing a data center with a 75 degree supply temperature and a 95 leaving temperature from the servers. This increased temperature difference allows for an HVAC system with a better configuration, but what does...
  12. MarauderX

    Chilled beams - outside air requirements

    Instead of passive chilled beams you may want to look at radiant panels. No ugly mess to sell to the architect, less engineering hassle, and less maintenance issues. The ventilation requirements remain the same - you can use a dedicated OA system to serve directly to the spaces you need...
  13. MarauderX

    Cooling Load Spreadsheet

    As others have stated, humidity is what is going to drive the load. You should see if they are having a designer resizing the load, and if not ask for the load calculations to prove a correct sizing. Commercial sizing is closer to 350-450 CFM/ton, or up to 1 CFM per SQFT. With the amount of...
  14. MarauderX

    Modeling/design

    Hmmm... there seem to be a lot of info missing. I'd lot at your application... you say you are making ice cubes, so you might want a mechanical system that can sense when the cubes are frozen and remove them from a tray. The heat exchanger might be an additional step that takes away some of...
  15. MarauderX

    Exhaust plume calcs

    Hey, thanks. As you mentioned decreasing the velocity isn't an option, but the nature of the prevailing winds may be the biggest problem. The only thing even close is a stair pressurization fan about 30' in one direction; everyone wants to know whether the diesel fumes will manage to get...
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