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Recent content by Norm01

  1. Norm01

    Ultrasonic Humidifiers Experience

    Has anyone had any experience with installing ultrasonic humidifiers? The literature claims that there are significant savings in energy cost as compared to electric type humidifiers. I have a AHU that supplies a 24/7 telecommunications room. Does anyone know what the advantages and...
  2. Norm01

    VAV with Bypass versus Bypass Box Terminal Units

    I would like to get some of your thoughts on the use of a VAV system with a main bypass damper on a RTU versus a system with a RTU and terminal unit bypass boxes dumping into a ceiling plenum. The project is a reletively small building 12.5 tons of cooling (approx. 5,5500 cfm). From what I've...
  3. Norm01

    Stairwell Pressurization

    Hello, I am involved with a renovation to an exisitng 5 storey hospital in Winnipeg, Canada. There is a new 2 storey front entrance going to be constructed and connected to the exisitng hospital. 2 hour rated firewalls will be used between the new entrance and the exisitng building such that...
  4. Norm01

    Glass Box Front Entrance

    The location of this project is Winnipeg, Manitoba, Canada so it very cold in the winter and very hot in the summer. A radiant floor system would probably be ideal choice, but it is outside the budget. There are no trees in front of the entrance. Recently, the architect is looking at using...
  5. Norm01

    Glass Box Front Entrance

    Hello, I am working on a new 2 storey front entrance to a hospital with large south facing windows (see attached sketch). The entrance will be used to connect people to the main hospital and a doctor’s clinic. It will be equipped with seating along the south and east walls and include a water...
  6. Norm01

    Isolation Room

    I have an existing hospital that is going to be adding two isolation rooms with a common ante room. The existing HVAC system is a constant volume dual duct system. I was thinking of using two separate exhaust fans (one for each room). Each room would be supplied with its own dual duct box. It...
  7. Norm01

    Perimeter Heat Loss

    I am trying to calculate the perimeter heat loss in order to design a radiant ceiling panel system (supplementing the building AHU system). The area is the top floor of a hospital. I have calculated the transmission loss through the walls, windows and infiltration. Should I be adding in the roof...
  8. Norm01

    Make-up Air For Fume Hood

    I haven't encountered this problem before so I hope someone can provide me with some help. I currently have a lab room that is supplied with 180 cfm (being fed from a ceiling mounted heat pump). In the room is a recirculating bio-hood that the owner wants to convert to a fume hood, which will be...
  9. Norm01

    Filter Pressure Loss

    I am just wondering what some you are doing when sizing your fans to incorporate the friction loss of a filter. For instance I have a situation where I need 2000 cfm and a MERV 13 filter. When I go to the manufacturers literature I find that for 2000 cfm the pressure drop through a 2" filter is...
  10. Norm01

    Duct Loop Design

    Here is the sketchhttp://files.engineering.com/getfile.aspx?folder=de15c219-1d08-4c1e-ac05-ded98a0200ef&file=Duct_Loop.pdf
  11. Norm01

    Duct Loop Design

    I have a data centre that requires 60 tons of cooling. Based on a report the project engineer did, the design is to use a duct loop and have the diffusers discharge into the cold aisles (See attached skech). We will require each to operate in order to satisfy the cooling load. AC-1 unit is...
  12. Norm01

    Oversized Roof-top Unit

    I am dealing with a retrofit project where an existing training room (approx.1025 sf) was modified to 5 office spaces (approx. 950 st). The existing roof-top unit (RTU) is a 7-ton constant volume unit (DX cooling). It originally supplied approx. 2,400 cfm to the training room. The system has...
  13. Norm01

    Upgrading a multi-zone AHU

    The AHU has one DX coil and one HC and then it goes to a plenum and braches out to each zone separately. There are some reheat coils that have been added with office renovations.
  14. Norm01

    Upgrading a multi-zone AHU

    I am working with a client who has an exisiting multi-zone air handling system (approx. 33 yrs old) with DX cooling and hot water heating. The building is two story ofice buidling with approx. 15 zones (there doesn't seem to be any purpose to the choice of zones and with renovations over the...
  15. Norm01

    Flow meter by-pass on fire pumps

    We have been designing quite a few fire pump systems lately and in the past have usually specified the typical test header arrangement (flowing water through 2.5" hose valves) for testing purposes. I am wondering though if going forward we should also be specifying a closed-loop metered by-pass...
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