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  1. StephenJcan

    interested in using PASS/Start-Prof.

    I saw Alex Matveeff posting on here. Would you get in touch with me? I'm evaluating between AutoPIPE, CAEPIPE and PASS to determine what's most user friendly. I'm new to this pipe stress but am tired of waiting on consultants. I have also emailed your software company.
  2. StephenJcan

    heat transfer for stability chamber

    Thanks for running that IRstuff. I'll try to download Mathcad and take a gander. I'm doing the calcs by hand using my heat transfer text, trying to get a rough estimate. So from your calculation even though the pipe is a dry head the lowest surface temperature of the pipe in the chamber will...
  3. StephenJcan

    heat transfer for stability chamber

    Hello guys, sorry for the poor problem scope. Here's a simplified version of the problem. I'm leaning towards a cylindrical fin with an adiabatic tip but would like some feedback as I'm really rusty with heat transfer. So a bit of background. The chamber is at 104F and the 3 feet of sprinkler...
  4. StephenJcan

    heat transfer for stability chamber

    Here's a problem I have at work and I was hoping someone could help me out. I haven't had to do a serious heat transfer problem since college. A stability chamber that maintains a constant 104F 80% RH room has sprinklers serving it. The 1" sprinkler pipe extends down into the room by about...
  5. StephenJcan

    Psychrometrics

    This is not a good design dumping outside air into the room and making the classroom a mixing box but for the sake of answering the question here were my thoughts. Hmmm I thought this was a simple draw a line from the outdoor air point to the cclt point on the psych chart but what I'd do for...
  6. StephenJcan

    hvac design data for russia

    Anyone know where I can get information on the degree days for Moscow, Russia? I've tried googling it but have not found anything yet. I'd like to run dry coolers for free cooling and I'd like to get an idea of how mnay months that would work for me.
  7. StephenJcan

    gas pipe sizing and pressure drop question

    Well as far as I know the service will be metered and the gas company will be providing the regulator for 14" w.c. The equipment also has separate regulators.
  8. StephenJcan

    gas pipe sizing and pressure drop question

    Sweet. Thanks for the info!
  9. StephenJcan

    gas pipe sizing and pressure drop question

    First thanks for the reply. 1) Would you cite me the code that says 1" w.c. drop for under 2lb? 2) Going to 5psi line requires additional permits which the powers that be do not care to do so we're stuck with using 14" w.c. Thanks again for looking at this. As an aside, the gas tables all do...
  10. StephenJcan

    gas pipe sizing and pressure drop question

    I have a few questions on gas pipe sizing and pressure drop. The total load is 20,000 CFH with an equivalent length of 400 feet, gas pressure is 14" W.C. and minimum operating pressure for the equipment is 10" W.C. Using the formulae for gas pressure I find that with 0.5" W.C. drop, I would use...
  11. StephenJcan

    How to calculate transformer heat loss

    I am trying to figure out what the heat gain would be for a 250kVA transformer. I have done several searches here and thru google and have not found corroborating info on the calculation. One site calculates the heat gain as: Heq = PeqK1K2 (W) where Heq = heat transferred from electrical...
  12. StephenJcan

    High rise design guidelines

    Thanks for the replies. Chasbean1 that's the kind of info I was looking for. I will check into that Animal lab reference. The stairwell pressurization w/ ventilated vestibule on every floor is something I will have to check into to see if it's necessary in this kind of building but I am not...
  13. StephenJcan

    High rise design guidelines

    I was wondering if someone would be able to suggest reference books/guides on how to design HVAC for a 6 story animal lab building. What codes and standards would apply? Thanks for any responses.
  14. StephenJcan

    Air changes for large warehouse to calculate infiltration loads

    Hello everyone. Can someone help me by directing me to a reference for air changes for large warehouses? A typical warehouse would be 500,000 square feet and 30 feet high with many dock doors. I have tried calculating the infiltration using the crack method but I read somewhere that for larger...
  15. StephenJcan

    Ductulator Usage

    Is the external static pressure to be 2" w.g.? By external I mean everything from the supply to the return of the unit. I am not sure what you are asking so rather than try to answer and look stupid I'll just wait for some clarification. :)
  16. StephenJcan

    ASHRAE infiltration method

    Anyone have an updated method of calculating infiltration based on Ashrae studies? I have posted a similar thread in the HVAC forum. I am revising my infiltration calcs for a metal building complete with dock doors and louvers. I have been using 25cfm/lf for crack infiltration per dock door and...
  17. StephenJcan

    High sensible, low latent cooling

    I am interested in researching air conditioning units that account for high sensible, low latent cooling. Does anyone out there know of any major companies that deal with this issue? Energy recovery wheels or heat pipes are not an option since outside air is not usually available. Thanks for...
  18. StephenJcan

    Propane gas sizing

    NFPA 58 governs propane. I have used the tables for natural gas and for propane but speaking with a propane gas rep there seems to be some other tables that are out there not in the NFPA. I have developed a spreadsheet that calculates any of the following variables: downstream or upstream...
  19. StephenJcan

    HVAC application

    Would it be possible to site the source of your info? I would like to see how the tests were done; if it was a typical metal building warehouse, average louver construction. We are having problems with shoddy workmanship but yet we are also trying to calculate a reasonable safety factor using...
  20. StephenJcan

    HVAC application

    I am looking for an application that will do heating and cooling calculations and be able to suggest the best system to cool/heat the space. Whether it be DX systems or a chiller system. Does anyone know a program having these properties?

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