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  1. dbill74

    Need to add vVentilation fan

    If you really want to DIY it; go to your local Home Depot or Lowes, get a toilet exhaust fan and mount it close to your laser engraver. Then some 4" dryer exhaust duct and go to a dryer wall louver with a backdraft damper.
  2. dbill74

    Need to add vVentilation fan

    We really need more information to give sound advice here. Fan manufacturer and model number for starters. That fan will be overkill. It is designed to deliver 900-1200 CFM of air when you need maybe 200-300 CFM. It sounds like and I"m assuming here, that your gooseneck roof vents have are...
  3. dbill74

    Need a rename macro for excel

    This just came across my feed in YouTube yesterday. Introducing REGEX Excel Functions Leila has LOTS of videos on how to use Excel and does an excellent job of explaining how to do all manner of stuff in Excel.
  4. dbill74

    HVAC System with VRV or Chiller System is Cheaper ?

    My experience has been that VRV's tend to be more energy efficient. That said, they aren't without other problems and complications. For one, they still need an DOAS unit and duct for ventilation air. Depending on your locale, the size of the system can have limits set on the amount of...
  5. dbill74

    Pipe insulation on the drainage piping receiving Condensate

    Noise is not an issue for pipe containing condensate water, there is not enough water to generate a lot of noise. (That argument makes sense for an internal roof drain where you get lots of water in a large pipe and the mass of cast-iron helps to dampen the sound.) The only reason you want...
  6. dbill74

    Need to learn Heat Load Calculation

    Have to agree with HVAC-Notice, that learning how to use a software package like HAP or Trace is not the same as learning heat load calculations. You need to have a fundamental knowledge of how to calculate heating/cooling loads before you dig into learning the software. There are a number...
  7. dbill74

    What's going on with my Carrier HAP calculations

    check your inputs. Did you manually input the people sensible/latent loads or select the type of use (office work)? Is this zone a single room (open office space) or does it consist of multiple individual offices? If multiple offices, how are they arranged? Any on south side of building with...
  8. dbill74

    Pipe insulation on the drainage piping receiving Condensate

    It is going to depend on the material of the condensate pipe. If you are using copper tube or another metal, having insulation would probably be a good idea. If you are using PVC, insulation is not needed as much. Are there any codes you need to abide by that mandate insulation?
  9. dbill74

    When is an ASME rated expansion tank required on a domestic water system?

    Unless the location of the installation is following a different code, in which case you need to search through that code.
  10. dbill74

    Differences between modern AC and air source heat pump compressors

    ACs and Heat Pumps both use the vapor compression refrigeration cycle to move heat from one space to another with direction of flow being the main difference. ACs move heat from the inside of a building to the outside (thus cooling the inside), whereas HPs move heat from outside to inside a...
  11. dbill74

    Minisplit AC in Small Server Room

    That is getting to be borderline needing floor mounted CRAC unit. From my experience, I'd say you're looking at closer to 10+ tons. Depending on how critical the servers are, having n+1 redundancy (minimum 2 CRAC units) may be needed, talk with users to confirm. What kind of flooring is there...
  12. dbill74

    Fan coil units - 19 ft. ceilings

    It is really hard to say without additional information. One of my first questions is how large is large? What exactly are you calling "Fan Coil Unit"? When I hear FCU I think a split Dx or chilled water unit with a maximum capacity around 15 - 20 tons and can fit in closet. Often comes as...
  13. dbill74

    Minisplit AC in Small Server Room

    Use caution when using ceiling mounted cassette, especially in the small closet sized server rooms. Despite Ductless split systems being bad about removing humidity and these rooms not having a lot of humidity to be removed, you can generate some condensate still. You do not want that over the...
  14. dbill74

    longitudinal centres od cooling tower

    You are better off asking the writer of that specification directly. I would interpret as limiting the structural support members to be no more than 4'-0" o.c. (on center)
  15. dbill74

    Need for diffuser or grille in elec room

    I can't think of any code requirement for providing a diffuser. However, diffusers improve air distribution and help ensure air gets where you need it versus just creating a pocket of cool air. Depending on who your occupants are, select groups of people tend to be mischievous. Diffusers can...
  16. dbill74

    HAP software- generating data in certain time only

    Why are you expecting the peak cooling load to be at 3AM? I'd guess some sort of night operation. In this case modify a schedule to have lights/equipment/occupants on/in the facility at the desired time. Then apply that schedule to your space inputs.
  17. dbill74

    Electric Reheat for Heat Pumps

    Providing supplemental electric heat on a heat pump really depends on the anticipated heating load and geographic location plays a major role in this decision. Where I am in southeast USA, south Georgia/north Florida specifically, using heat pumps with electric heat is common since the heating...
  18. dbill74

    Multi-Family HUD Design Requirements

    Unless they give some requirement, it would be prototypical dwelling unit built to the residential building code adopted by the city/state. They're going to want to build on the cheap, so nothing fancy or complex.
  19. dbill74

    Compressor room filtration and Ventilation

    Can you provide more information about the problem you are trying to solve? In your original post you state I read this as getting excessive oil in the compressed air system. If this is correct, enclosing the compressor room is not going to solve your problem since air entering the compressor...
  20. dbill74

    New house build - one or two HVAC systems?

    Bottom line is better control and efficiency. Having more then one unit allows multiple zones which can be different parts of the house. Either east/west, north/south, or by floor. With more zones and control comes better overall efficiency. When you and your family are in one zone/floor, the...

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