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  1. carlosgw

    NFPA-13 Sprinklers under exposed flat wood joist framed roof - question

    NFPA-13 Sprinklers under exposed flat wood joist framed roof - question. Low Hazard Correct me if I am wrong: Combustible obstructed construction with members less than 3ft OC – so 130 SF max. But the flow can still be .15 GPM/SF
  2. carlosgw

    NFPA 13 maximum area protected per riser

    I'm glad I looked at this thread. We are on NFPA 13-2016 in NY. It's 52,000SF/floor. In 2016 they added some stuff about more than two floors. (I just saw this - hence why I'm glad.) I just looked at 2019 and it looks like they completely rearranged to standard. Can some one point out where is...
  3. carlosgw

    Successful stratification strategies for balcony areas?

    Two story buildings with the second floor open to the first. The second floor can get very hot. Esp. in the winter. Do you have successful ways to keep the second floor cool short of cooling in the winter? (cooling while the first floor is heating)
  4. carlosgw

    Smoke Control Design

    Is the following something that can be modeled with available formulas? A building connector that connects two buildings three floors each. An exit from the middle floor. About 550 SF foot print. It has open stairs with less than a foot open either side around an elevator. There is no wide open...
  5. carlosgw

    Noise Reduction for HVAC ducts

    Would installing stiffeners on the duct help with the rumbling/oil caning? (see SMACNA reinforcement)
  6. carlosgw

    IMC 2015 and ventilation of dwelling units

    Thanks. It (2015 IMC) actually does get specific for dwelling units.
  7. carlosgw

    IMC 2015 and ventilation of dwelling units

    International Mechanical Code - 2015 Ventilation for residential buildings over 3 stories vs. 3 stories and less. The way I read IMC 403.1 is for a 4 story or higher residential building - because it is covered under the commercial energy code and not the residential energy code - is that...
  8. carlosgw

    GPM flow for pump size for low rise standpipes?

    Already done. But it was only a cursory review by the FM. In our town the FM does not really review drawings until the contractor goes for their specific (sprinkler) permit. By then it is bid and any change is a big change order.
  9. carlosgw

    GPM flow for pump size for low rise standpipes?

    A manual standpipe is the plan. I am covering the contingency just in case the local fire marshal does not agree. Plus technically I need to check the flow from the FDC to the standpipes.
  10. carlosgw

    GPM flow for pump size for low rise standpipes?

    Sorry - Reference is NFPA 14 Reading 7.10.1.1, I think it means 500 GPM total for the standpipe split between the two most remote outlets.
  11. carlosgw

    GPM flow for pump size for low rise standpipes?

    If we were to use a pump for a low rise building with two standpipes: Would the flow be 750 GPM, 1000 GPM,or 1250 GPM? I think 750 GPM with 250 for the two top outlets on the most remote standpipe plus 250 for the second stand pipe. However I and confused by 7.10.1.1 which says 500 GPM at the...
  12. carlosgw

    Small DDC networks?

    Can anyone point me to a good primer for connectivity to small BACnet networks. Small single building networks with just a few controllers. Specifically how and where to make the local work station connection and how/where to connect to the internet for remote access? Can a connection be made...
  13. carlosgw

    Reuse 1964 DX coil?

    Do you think trying to re-use 1964 air handling unit refrigerant coil with new refrigerant is a non-starter because: 1. New refrigerant pressure? 2. other reasons? Assume there is no information on the existing coil available - which would be actual case.(other than size and connected...
  14. carlosgw

    Office humidity complaints

    North east - hot fairly dry summer Existing building newly renovated last few months. Office space with rooftop units with gas heat. Occupants complaining about musty smell and humidity in in the 60% range. Space maintained at about 74 deg. RTU discharge temperatures are low 48-49. So they...
  15. carlosgw

    Covert DX coil from R22 to R410A?

    Thanks for the info.
  16. carlosgw

    Covert DX coil from R22 to R410A?

    I would replace the piping with the condensing units. Do the expansion valves need to be replaced. No idea on rating of the existing coil. What is the low side pressure for R-410a?
  17. carlosgw

    Covert DX coil from R22 to R410A?

    What are the issues with using R410A in a coil originally designed for R22? My specific application is a 2 circuit 15 ton (2 7-1/2 ton) air handling unit coil.
  18. carlosgw

    Refrigerated work area design

    Doesn't need heat as the room is internal (surrounded by heated building).
  19. carlosgw

    Refrigerated work area design

    I want to look into what it takes design refrigerated (occupied) work space (2,200 SF @ around 40F meat processing for example). As a starting point what equipment is typically used.(northern US ventilation and cooling, probably don't need heat)
  20. carlosgw

    Add heat for ground souce heat pumps?

    Thanks for the replies. When you add a boiler, do you work it out so you are raising the temperature of the water as it comes back from the wells up to the design temperature? For example if the design temperature is say 35 deg and it is coming back at say 30, add heat via heat exchanger to get...

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