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  • Users: Engineer6512
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  1. Engineer6512

    Dilution Ventilation Calc - Sanity Check

    Has anyone done a dilution calc of this type before?
  2. Engineer6512

    NFPA 96 - Grease duct access size

    If you look at section 7.4.1.1 it states for a horizontal opening, dimensions must be at least 20" x 20". So for a vertical opening I would say at a minimum those dimensions should hold, but realistically even that might be too small to accomodate the equipment used to descend/acent the duct...
  3. Engineer6512

    Dilution Ventilation Calc - Sanity Check

    My main issue that I am not sure about is if I am handling the units and the conversion of CO from mg/min to a volume of gas correctly. I am using ACGIH dilution calcs as a reference, but the only examples they give are for evaporation of a liquid in pints per hour and the associated constants...
  4. Engineer6512

    Dilution Ventilation Calc - Sanity Check

    Hi walkes, yes its an indoor arena, but size of the space does not matter with a dilution calc... only the rate of generation and the allowable concentration, per ACGIH.
  5. Engineer6512

    Dilution Ventilation Calc - Sanity Check

    Thanks for the reply, but the vehicles are actually being driven, not stationary... sorry forgot to mention this important point.
  6. Engineer6512

    Dilution Ventilation Calc - Sanity Check

    I'm calculating required outdoor air for a vehicle test facility where the vehicles will be running continuously in the space. Here are my calcs - please feel free to comment on anything I might be missing. CO is the dominant contaminant. Allowable max concentration is 29 mg/m3. CO generation...
  7. Engineer6512

    Conditions under which snow will form

    Yes it will be a horizontal wall louver.
  8. Engineer6512

    Conditions under which snow will form

    I am exhausting 25000 cfm of air at 100% RH, 50C. This is in a northern climate and the outdoor ambient temperature will be in the vicinity of -40C at times during the winter. Do I need to be concerned about snow formation (and hence a potential maintenance nightmare in clearing it)? What about...
  9. Engineer6512

    closed loop static pressure

    The movement of air through the duct system is based solely on the differential pressure between two adjacent points. Air will flow from higher pressure to lower pressure. So in this system, you have two primary sources consuming pressure - friction in the ductwork, and the filter. You have one...
  10. Engineer6512

    Off-gas Analysis

    Thanks for the reply JimCasey. That's exactly the information I was looking for and the way that I will proceed.
  11. Engineer6512

    Off-gas Analysis

    Thanks for the replies. Following is some more detailed information. The solid is bitumen ore (aka tar sand) from a mining operation. The tar sand is being transported inside of closed buildings via open conveyor belts, and there will be odour and fume generation from the material as a result...
  12. Engineer6512

    Off-gas Analysis

    I have a solid petroleum compound being handled in a process building and would like to determine what gases are being "off-gased" from it and at what rates - purpose of which is to supply adequate ventilation. Can anyone tell me the type of chemical analysis I am looking for? And possibly...
  13. Engineer6512

    tank fabrication software

    Try COADE "Tank" software. It should do what you're looking for. www.coade.com
  14. Engineer6512

    air exchange rate - residential and industrial

    1. Yes, fans can increase the air exchange rate. 2, 3. Yes there is a standard - ASHRAE Standard 62: Ventilation for acceptable indoor air quality. See www.ashrae.org.
  15. Engineer6512

    P-trap at air-handling unit drain connection

    I would always install a P-trap regardless of whether it is blow through or draw through. You have to consider all conditions including when the unit may not be in operation. When the unit it not in operation there would be nothing to prevent drain gases from migrating up into the unit /...
  16. Engineer6512

    ASHRAE 62.1 for multi-unit residential

    Conisder using a Heat Recovery Ventilator (HRV) in each unit. Several manufacturers now make apartment sized units in the under 100 cfm range. Your steady state ventilation (both supply and exhaust) is taken care of by the unit. When a bathroom fan or exhaust fan is in use, extra air is allowed...
  17. Engineer6512

    Auto-recirc Valve Sticking

    We have a number of Automatic Recirculation valves in service for minimum flow protection on centrifugal pumps. Service is water condensate at ~330 F. The issue that we are having is that there is scale buildup on the inside of the valve and it is causing the recirculation plunger to stick...
  18. Engineer6512

    Office HVAC requirements

    There is a required capacity for ventilation air. It is covered under ASHRAE Standard 62.1 and specifies the amount of outdoor air required based on both the square footage of the space and the occupancy. There is an alternate method called the Indoor air quality procedure that is based on...
  19. Engineer6512

    Industrial Ventilation Rates

    Yes I recognize that - thanks for the reply, but as I stated in my post, this particular building has negligible internal heat gain. It has only a few small pumps in one corner, and the rest is all piping (cold water). Another building I am doing is an electrical house that has its cooling...
  20. Engineer6512

    Industrial Ventilation Rates

    Thanks for the reply. That's what I'm getting at though... what is an acceptable Air Change per hour rate for industrial / process buildings that have negligible heat and/or contaminent generation and are usually unoccupied? If I look in "ASHRAE Applications", under 'power plants' for example...

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