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...
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...
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...
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...
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...
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...
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...
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...
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...
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.
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...
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).
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 /...
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...
