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  1. Replies
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    Ammoniadog that reminds me of a new chiller...

    Ammoniadog that reminds me of a new chiller installation that the owner didn't think was doing design cooling of the water. I knew the chiller guys boss very well because I mentored him during his...
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    I don't know exactly where he is going with this...

    I don't know exactly where he is going with this but I do know he thinks the critical race theory is racist. He thinks it urges us to hate each other. I think he wants to point out using humor to...
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    Critical Superiority Theory

    My brother has come up with the idea of creating a critical superiority theory. It starts with the premise that some people are basically stupid and can't be reasoned with. I think his idea is...
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    Call the chiller plant engineer. The best way to...

    Call the chiller plant engineer. The best way to control the water is variable speed pumps with the chilled water flow controlled by the load and the condenser water flow controlled by the chiller...
  5. It gets better with age adam75 because you forget...

    It gets better with age adam75 because you forget what you forgot.
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    Plug fans are used in industrial applications and...

    Plug fans are used in industrial applications and can handle a wide variety of conditions. My old Greenheck sizing program indicates they can move from 600 CFM to 70,000 CFM at up to 8 inches static...
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    In small systems short radius ells don't matter a...

    In small systems short radius ells don't matter a great deal. I like what BBeerme did because it looks great and reduces the probability of leaks. In commercial hydraulic systems and steam the use of...
  8. In a case like this I didn't know whether to be...

    In a case like this I didn't know whether to be glad I hadn't forgot or pissed that I wasted my time going back.
  9. Replies
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    1,302

    Long radius elbows have less pressure drop and...

    Long radius elbows have less pressure drop and are preferred for that reason. Short radius can be used where necessary.
  10. Replies
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    The explanation of this gets pretty long and to...

    The explanation of this gets pretty long and to be perfectly honest my memory is no longer good enough. Try the HVAC School site I think you will like it. I'm not trying to avoid your question just...
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    You guys are too smart on this thread and I'm...

    You guys are too smart on this thread and I'm always impressed here. I would love to witness when some wise ass engineer trying to bullshit you guys.
  12. Replies
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    1,387

    This motor when wired 208 operates as single...

    This motor when wired 208 operates as single phase because only two legs are connected without a neutral and it therefore runs less efficient on 208 than 230 single phase. It also produces less...
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    In my opinion you strive for perfection but be...

    In my opinion you strive for perfection but be big enough to fully recognize your short comings. Just because you did it doesn't mean it has to be right. Do the job with the confidence it is right...
  14. In commercial the last time I looked it was 15...

    In commercial the last time I looked it was 15 CFM per person unless you had windows that would open then it was 7.5 CFM per person. That was some time ago.
  15. Google will answer your question.

    Google will answer your question.
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    I just found out this project is part of the...

    I just found out this project is part of the national engineering historic ******. Don't remember the full name. This was my first design assignment.
  17. Replies
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    Per post #12 the first thing you need to do is...

    Per post #12 the first thing you need to do is get the specified control sequence and thoroughly understand the entire intent. We could probably guess pretty close but that isn't good enough. If all...
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    Relieving air when not economizing is a complete...

    Relieving air when not economizing is a complete waste of energy. If that is necessary for air quality you should and almost certainly would have an ERV to recover as much of the energy as possible....
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    Too much of the drawing is unreadable for me to...

    Too much of the drawing is unreadable for me to tell what they are trying to do. It looks like a large supply grid at the bottom. They really don't show any diffusers. Looks like a trick question to...
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    1,693

    When the return fan CFM is specified less than...

    When the return fan CFM is specified less than the supply fan CFM by the amount of the outside air required the return fan's job (in non econ mode) is to reduce the negative static created by the...
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    In your case in post #5 the engineer probably...

    In your case in post #5 the engineer probably didn't word the spec right. One thing to remember is buildings that are occupied with live people have to have fresh air which has to be drawn in or in...
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    1,693

    The setup and configuration can be a challenge...

    The setup and configuration can be a challenge for a TAB guy. After a while you get a feel for how to start the setup which helps. Most designs have little or no consideration of how the TAB is going...
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    Welcome aboard Justin you will love this site....

    Welcome aboard Justin you will love this site. The answer to your question is yes the return fan should be delivering 8605 within the specified balance tolerance (normally +/- 10%). If properly set...
  24. Talk to York about controlling tower water flow...

    Talk to York about controlling tower water flow using condensing head pressure that results in maximum efficiency. This should show the energy that can be saved and lead to possible changes in the...
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    I have a home made one. It consists of a 3/8"...

    I have a home made one. It consists of a 3/8" cross with pipe on one outlet that has a quick connect for a gage, vent valve on another and two ball valves for inlet pressure.
  26. Replies
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    Ashcroft sells them. They make great gages as...

    Ashcroft sells them. They make great gages as well.
  27. Replies
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    desert guy is dead on. The returns are considered...

    desert guy is dead on. The returns are considered by the balancer as "Wild Returns" and are not even measured unless he can't find a place to pitot the return duct. Even if measured for total flow...
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    The biggest problem with throttling with BFV'S is...

    The biggest problem with throttling with BFV'S is they do 90% of the throttling within the first 10% open. Your application looks to be OK.
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    To justify changes without compromising your...

    To justify changes without compromising your company tell the owner the new suggestions are the result of an ongoing quality assurance program that is based partly on state of the art technology. It...
  30. One thing that should be pointed out is that...

    One thing that should be pointed out is that stack effect calculations are approximate. The two methods I'm aware of yield slightly different results but are useful.
  31. The most frustrating thing I ran into when I got...

    The most frustrating thing I ran into when I got into TAB was measuring static pressures. They are simple to measure but in residential systems are rarely accurate. The problem goes away if you can...
  32. Shane I did the calcs on my MATHCADD program so...

    Shane I did the calcs on my MATHCADD program so there is no link. That program can do array calculations which is how this was done. Once the array is set up all I have to do is change the parameters...
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    Do what you want to do but don't ever regret...

    Do what you want to do but don't ever regret doing it. You can look back and see where you could have and should have done differently but always remember you did what you thought best. You will do...
  34. Stack effect for a 100 foot tall building ranges...

    Stack effect for a 100 foot tall building ranges from about 0.01 inches WC at -20F to 0.25 WC inches at 68F. I haven't calculated it for higher temperatures but it is easily done if needed.
    These...
  35. It depends on why the pressure drop increased. If...

    It depends on why the pressure drop increased. If the pressure drop increased due to plugging of the filter the airflow will drop a lot (588 CFM) but if the increase in drop was due to increased...
  36. A building pressure of 1.5" WC would blow your...

    A building pressure of 1.5" WC would blow your windows out. You mentioned monitoring the room pressures but are you attempting to control the pressures? Your building pressure goal with reference to...
  37. After thinking it over the SGR is SHAFT GROUND...

    After thinking it over the SGR is SHAFT GROUND RING. Reference post #32
  38. I'm retired and may not be on the cutting edge of...

    I'm retired and may not be on the cutting edge of this issue but based on past experience I would check this out. A lot of experimenting was done years ago when motor bearing problems became a...
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    When working as an air balancer I tested hundreds...

    When working as an air balancer I tested hundreds of resi units installed on commercial jobs and almost none had pressure drops of 0.5 or less. You are correct the air filter in many cases had at...
  40. It is well documented that buried copper pipe...

    It is well documented that buried copper pipe will last for many years (50 or more) in soils other than those highly corrosive. In your area the only worry you have is rocks.
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    One thing that has made this site great is that...

    One thing that has made this site great is that in spite of the ever changing political atmosphere fairness to all has been a priority. I don't think that will change.
  42. Welcome aboard andregsr you will like it here....

    Welcome aboard andregsr you will like it here. Sorry but I don't understand what formula you are looking for. Can you be more specific?
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    I would start by setting the VAV min at about 10%...

    I would start by setting the VAV min at about 10% of the box max. That is a little air to keep fresh air coming in but will still require setting the bypass dampers. That will normally save you a lot...
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    Well thought out anthonyac1. You have some good...

    Well thought out anthonyac1. You have some good points.
  45. Replies
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    For $100 try what ever you want but if I'm...

    For $100 try what ever you want but if I'm reading you right if there is one minor thing you don't like about the new non-Fluke you will buy a Fluke. It is hard to change after you have had...
  46. Come on JB back then some A-Hole started a forest...

    Come on JB back then some A-Hole started a forest fire that melted the ice. The comical thing about all this is that there is a popular theory that we can make Mars inhabitable but are screwing up...
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    You have a solution that will work it's just a...

    You have a solution that will work it's just a matter of whether you want one bypass or multiple. If there are several runs of duct I would lean toward what you are proposing.
    I don't suppose the...
  48. If all else fails contact the VMC Group. They...

    If all else fails contact the VMC Group. They handle Amber Booth which is first class.
  49. It sounds to me like the application needs...

    It sounds to me like the application needs thought out with considerations given to all sides including total cost (that includes maintenance). If properly designed this system will perform. Proper...
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    A pocket protector person is fine but I would...

    A pocket protector person is fine but I would want one that could also hit a nail with a hammer the first time. That person is the most likely to give you a good workable design because they...
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