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  1. atlas06

    HEPA filter resistance and pressure drop

    HEPA filters should not exceed 250 FPM. Insalled in diffusers, we find that in laminar flow applications of Operating rooms in Hospitals. HEPA filters can add up to 2.5" PD, your fan is likley not sized for this additional pressure drop. You could crack your duct system with that kind of...
  2. atlas06

    Bleed off from Cooling tower

    http://www.clearwater-dolphin.com/market_research.htm Yiu ought to develop the instinct to google out things. Smile - :)
  3. atlas06

    Bleed off from Cooling tower

    try looking into the dolphin water treatment system if no one wants to deal with chemical treatment. incidently, I have read case studies and all on the Dolphin water treatment system and it appears to sell good. Even ASHRAE green tips list it as an energy and water saving system. Question...
  4. atlas06

    Thermal VAV versus Powered VAV

    In addition, they do not allow reheat for spaces such as conference rooms, excess air goes into the plenum,conference rooms cannot get min outdoor air with such a product, due to no possibility for full flow with reheat. the fan system operates as a CV system. It does not throttle at all. Good...
  5. atlas06

    Primary/secondard decoupling Line

    Forget about option 2. you are doing a series pumping system with that, no more, defeats the purpose of P/S ssytem in my view. Your primary pump will need to be sized for half the system head instead of just primary loop. Alos, you will have two incompatbile system, one with PD and VFD, the...
  6. atlas06

    generator stack

    Try this http://www.maximsilencers.com/software/silsizing.html
  7. atlas06

    Hot well /Cold well tank sizing for chilled water application

    Thank you SAK9, you seem to handle your subject pretty well. My question is: If the absorption chillers do not turn down well and the load is so big in this plant, why use a tank altogether? If the load is this large, just sequenc eyour chiller plant to the one or two chiller sneedd to meet the...
  8. atlas06

    Oversized Roof-top Unit

    Will second chasbean1 on this. We have seen engineers sued by client over this issue. RTU sized for a national guard training facility plus office space. But the guard is there only 2/3 days per month, the rest of the month, the thing is so oversized that it freezes the place in 10 minutes...
  9. atlas06

    would you discourage your child to take up engineering in college?

    I've heard that a Mechanical engineer refused to work for Vince Lombardi playing football because he made more money as a Mechanical Engineer than as a football player. Some movie director once said (early period of cinema): "who the hell wants to hear actors talk". Those were the days I...
  10. atlas06

    $25/hr no overtime pay for PE with 9 yrs exp

    what part of the country is that, where 9 years plus PE cannot find a job over $25/hr? Not worth sticking around such a region.
  11. atlas06

    Conditions for training of employees

    In order to compete in this tech age, a company must train continuously, as a result, a small overhead fee should be incorporated in every project (say 1% of total fee) from an employee perspective, any time we have a new project with substantial fees, I go through our library (books and...
  12. atlas06

    Butter fly valves vs. gate valves

    I would not use a gate valve on something that does not open/close at least once a year. Gate valves tend to get stuck (molecular wear) in the position they are left in. After say 2 years, you try to close an open valve, well, chances are, it wouldn't, it could pop on you. gates are good for...
  13. atlas06

    Finding out what the customer REALLY wants

    Often times, when a client hires an A/E firm, he wants to be advised on the best way to use his money and get expert opinion on the course of action to take, since he is plunging into unfamiliar territory. We see a lot of engineers providing the owner with different ways to do things, and then...
  14. atlas06

    Exempt employee attendance policy

    Kenat, I always enjoyed reading your UK perspective of things on this forum. US statistics indicate the following (heck I read it somewhere): 1. Most companies have 15% of workers that could be fired out right and the result will be a better production at the company - That's 15% that do a lot...
  15. atlas06

    Hiring other Firms for QCC's

    80 hours to review a project. It must be a very large project for that kind of time. I review projects on a moonlighting basis for a friend who has an engineering firm and a decent project (say a 70,000 SF school) would go around 40 to 50 hours. In those 50 hours, I'd have 250 comments at...
  16. atlas06

    Exhaust plume calcs

    Vanderweil, (I meant Marauder, sorry I couldn't help it, you company would not hire me 12 years ago) I think you worry about the wrong issue. For you to control the plume, you'd have to restrict the discharge throat out of the muffler (i.e increasing the discharge velovity), which you don't...
  17. atlas06

    Exempt employee attendance policy

    Good workers always get their way and much more. I never call in late. when I am late, I just arrive late and then stay late if needed. If no rush, I still leave the office at regular time. As for going to the doctor, I just notify the boss, I don't ask for his permission. BUT, you got to walk...
  18. atlas06

    Geosource Heating

    Consider some serious shock absorbers, may be the whole thing should rest on large inner tubes just in case you lose control of the thing as it goes down. The inner tubes should help saving your structure. Let us know how this thing went, will you?
  19. atlas06

    Below-grade walk-in freezer

    You may want to have a separate slab for the freezer. I've also heard of a technique which consist in running 6" PVC pipes from the plenum (open end) along the outside of the freezer walls, under the freezer slab, and then back to the ceiling plenum along the opposite freezer wall. In a way...
  20. atlas06

    Chilled beams - outside air requirements

    The literature you should be reading is the "induction units design" they operate in a similar fashion. But I sense that you have a difficulty in applying this technology, you may want to get the manufacturers to help you somewhat (and I say somewhat because they will sell you fish in the sea)...

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