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Recent content by dblyle

  1. dblyle

    Commercial Attic Ventilation

    Yes, it's a little different design for me as well. So the attic is a true attic space - it is the space between the cooler ceiling and the roof of the building (about 21') with walls on all 4 sides. The commercial building codes say we need to ventilate at the rate of 1cfm/sq.ft. That's a...
  2. dblyle

    Commercial Attic Ventilation

    So, I have large warehouse (~60,000 sq.ft.) in Dallas in which we are installing low temp coolers (36 degrees) in the space. The coolers are 4" IMP (insulated metal panel) and 16' tall. The Warehouse is 37' tall. Think "building in a building". Given that I have a very large "attic", I feel...
  3. dblyle

    Contractors engineer vs consulting engineer

    I have to disagree with cry22. I'm a licensed PE and have worked on the contracting side for the past 10 years. Our firm is a design/build shop (HVAC only) and I can assure you our engineers are very aware of codes, calculations, etc. that cry22 mentions. I can also tell you that we spend a...
  4. dblyle

    Viewports don't use Plot Styles

    Sorry if this has been posted before, but I couldn't find it anywhere... We just upgraded to AMEP 2011, and for some reason, my viewports in paperspace don't use the plot styles we have set up. Even with the monochrome plot style, everything on the paperspace is B&W, but everything in the...
  5. dblyle

    Three-pipe system design

    We are currently replacing the chillers and controls in a three-pipe system - HW supply, CHW supply and common return. Has anyone seen a system like this before and can you give me a sequence of operation? I am trying to decide if we need another by-pass on the chill water side to allow the...
  6. dblyle

    Illinois Balancing Valve

    All, I ran across an Illinois brand Balancing valve that was installed around 1983. Instead of having to replace all 175 valves, I was wonding if anyone had heard of this brand, if they are still around, and/or if anyone had a copy of the balancing charts used with this valve? -DOUGLAS
  7. dblyle

    Cold Room Humidity

    Jakejas, I am referring to the evaporator coil that is physically in the room. While the method you mentioned is typically used in this area (Houston) to control humidity, newer energy codes are preventing both cooling and heating (reheat) of the same air, so make sure you check the codes...
  8. dblyle

    Cold Room Humidity

    Thanks for all of your suggestions on this. I am cautious about dropping the temperature in the room too much due to the tight constraints on the temperature (38 degrees +/- 1 degree). A large temperature drop will require reheat, which I really don't want to do. I have found a dehumidifier...
  9. dblyle

    Cold Room Humidity

    I have a client with a cold room (insulated box), 12'(L)x 18'(W)x 8'(H) that is currently at 38 degrees F, 80% RH. She wants to the room to maintain 38 degrees F and 60% RH. I don't have much experience with cold rooms so I am really not sure how to get the humidity down. The room is...
  10. dblyle

    Wine Storage

    Need to keep a wine room at 55-60 degrees (room is 14'x2' with a 10' ceiling). Anyone have any suggestions as to what kind of equipment I should look at using?
  11. dblyle

    Interesting Iso Room Design

    I initially thought about doing what Marcoh did (single chiller with AHU), however the system is too small. A chiller under 5 tons will still only have 1 circuit and not unload properly. Can anyone think of the disadvantage of an ERV connected to a RTU? The only thing I can think of is that...
  12. dblyle

    Health Reasons for 75 CFM bathroom exhaust

    What code are you referring to? Most codes I have seen require minimum of 50 cfm per fixture.
  13. dblyle

    Interesting Iso Room Design

    Here's the situation: I have a small (~14x16) iso room which I am designing. To achieve the required ACH (including the anteroom, restroom, etc), I need a unit to produce 411 cfm. Here's the problem: 411 cfm of 100% OA doesn't really work well with a DX system (Location is in Houston, Texas...
  14. dblyle

    No Flow thru FCU???

    Thanks for your response, Quark. I'll scan in a sketch of the system tomorrow morning. As for your suggestions: 1. The unit sits in the basement of a 15 story building. My guess is that most of what I am seeing is standing pressure on the system. 2. The building is part of a larger campus...
  15. dblyle

    Water Chiller Brands /Manufacturers ?

    On a chiller that small for a specialized application, I have had good luck with the Technical Systems chiller from RAE Corp (https://www.rae-corp.com/TechnicalSystems/Products/Chillers/AirCooled/Series30A0/tabid/96/Default.aspx). You might also want to see if you can work with someone at...
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