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  1. ME27272727

    New AI / Machine Learning Energy Conservation Companies

    Hey guys. I've been seeing a lot of this lately where a new software / AI company will integrate to an existing BMS to use AI / machine learning to "optimize" building energy usage. I'm part of a project where I have to retrocommission and ensure minimum ventilation requirements are met, and...
  2. ME27272727

    Repair Garage - Overhead Door Make-up Air

    I'm working on a vehicle repair bay, and it dawned on me that it would be a lot less hassle and cost to wire a garage door to open upon exhaust purge fan (min 0.75 cfm / SF) activation from NOx / CO2 detection in lieu of large stationary louver with motorized damper. Has anyone ever done this...
  3. ME27272727

    Percolation (Perc) Test - Clay Soil

    Thanks for the responses. So if I understand correctly, on a large lot (20+acres) without ecologically restricted area / wells, where nearby homes are on tight clay with modified raised bed septic systems, it's very likely I should be able to build somewhere on the site with an alternative...
  4. ME27272727

    Percolation (Perc) Test - Clay Soil

    With all of the alternative septic systems available today, is there ever a risk that a site is completely unbuildable due to poor soil permeability, or is the risk just associated with added cost of having to provide an alternative, more expensive system than a conventional subsurface system...
  5. ME27272727

    Roof Drain Steel Support

    When designing the openings to support roof drains, does the steel need be under the roof drain flange to properly support the drain, or does it need to be a few inches further out to allow for the required space in install the drain? I'm having a hard time finding a detail or installation...
  6. ME27272727

    Exposed Ceilings vs Plenums

    Hey everyone. Do open ceiling spaces (ie. rooms with no ceilings, exposed to deck) have the same smoke / flame spread requirements as those in an above ceiling return air plenum? Ultimately, I'm attempting to identify is PVC DWV piping is allowed in a building with open spaces, and whether all...
  7. ME27272727

    Core and Shell HVAC Sanity Check

    I can use a refresher on core & shell HVCAC / MEP design and see what others are doing. Most of my experience has been with smaller low-rise commercial buildings with very basic heating only and minimal toilet exhaust systems provided by the owner, where the tenants will typically later come in...
  8. ME27272727

    HVAC Equipment Lead Times

    This probably isn't news to anyone in the field, but equipment lead times are absolutely out of control and getting worse. VRF seems to be the only equipment in stock, with VAV RTU's / DOAS units sometimes 30-50 weeks out depending upon capacity. Boilers, chillers, pumps are from 10 to 50 weeks...
  9. ME27272727

    WSHP and Cooler / Freezer Heat Recovery

    Is there anything wrong with putting water cooled freezer / cooler condensing units on a water source heat pump loop for heat recovery? I see the benefit of "free" heat in the winter, and better compressor efficiency in the summer with evaporative cooling vs air cooled condensers. I've never...
  10. ME27272727

    Commercial Kitchen Hood Makeup Air

    Cold climates (zero degree design day). I suppose a "typical" restaraunt kitchen containing a heavy-duty hood with ranges, kettles, deep dryers, with aproximately 7,500 CFM exhaust and 80% makeup at the hood.
  11. ME27272727

    Commercial Kitchen Hood Makeup Air

    In cold climates, I've always been specifying makeup be tempered (heating only). The IMC requires tempering, or the ability of the HVAC system to be able to handle the additional load of raw makeup air. However, I've seen others moving towards no conditioning of makeup air when using...
  12. ME27272727

    Do operable windows count as openings for mechanical ventilation?

    Natural ventilation seems to be a grey area and up to interpretation. In my opinion, you should consider space type, climate zone, and whether occupants will actually keep windows open while the space is occupied (not going to happen for the great majority of locations).
  13. ME27272727

    WSHP Diversity - Central Equipment

    When applying a diversity factor to water source heat pump systems, let's assume 80% for this example, do you apply this factor to pump flow (variable primary pumping)? I've been told by a grey-haired engineer to size pumps for total connected load, and to apply diversity factor to boilers /...
  14. ME27272727

    Nickel Plating Room HVAC

    MintJulep, thank you. I completely agree.
  15. ME27272727

    Sulfamate Nickel Electroplating

    Hello. I'm seeking information on sulfamate nickel plating process ventilation / exhaust requirements. The bath is about 4'x5' in a 600 SF room located in an office building. It will be covered during operation. I've seen conflicting information from what I can find, where some sources claim...
  16. ME27272727

    Nickel Plating Room HVAC

    I can use some opinions on a recent project involving a nickel formation plating room. It's a small room about 600 SF with a 4'x6' nickel bath. The client had an industrial hygienist take readings of the air and surfaces in the room which resulted in harmless levels of airborn toxins. The...
  17. ME27272727

    Steam vs Hot Water Heating

    I have a project where high pressure district steam is available and distributed to buildings on an industrial site. My scope is heating and ventilating about 50,000 SF of manufacturing space. I'm deciding whether to reduce pressure at the building steam entrance and distribute low pressure...
  18. ME27272727

    GIS - Public Sewer / Water

    Hello. As a mechanical engineer with access to the full AEC collection suite, and decided to start tinkering around with Civil3D and Infraworks. I just started diving into the world of GIS data, parcels, and Lidar elevation data. I'm enjoying the learning process and blown away by the data...
  19. ME27272727

    HVAC Equipment Design

    Have you ever been part of an audience where a speaker asks a question to a packed room and someone raises there hand just to shout out "I don't know"? Please answer only if you have something useful to contribute. Thanks.
  20. ME27272727

    HVAC Equipment Design

    Can anyone help point me in the right direction of software / resources which may be helpful in the design of HVAC / refrigeration equipment? I come from the world of HVAC building systems engineering, but I'd like to start learning more about equipment design. For example; is there software out...

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