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  1. Your original question was about a church which...

    Your original question was about a church which as a rule has commercial AHU's. Any change that will increase pressure drop has to be compared to the design and actual performance of the equipment....
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    In middle America for the last 10 or 15 years...

    In middle America for the last 10 or 15 years outside air control in commercial buildings has been by a combination of CO2 and building static pressure control. A lot of commercial buildings never...
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    I visited the home and the design was different...

    I visited the home and the design was different than I expected. It was originally an apartment building. The toilet exhaust fan in each room is on a switch so most of the time the odors have no...
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    Thanks 2sac I am rusty now and have never heard...

    Thanks 2sac I am rusty now and have never heard of that. I will check into it.
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    Retirement Home Odors

    I have been ask to make suggestions to remedy odors in an old folks home. Aside from fresh air quantities and distribution I am going to look at air filtration. What type of air filters in your...
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    Phone Call From Hell

    Three guys died about the same time and were sent to hell. One was from Dallas, one from Miami and the other from New York City. The devil told them we have a phone that can call earth buy it is very...
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    The numbers Artrose judging by their magnitude...

    The numbers Artrose judging by their magnitude are velocity in feet per minute. The digital meters will make that conversion for you. One reason they do that is to eliminate someone from averaging...
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    The equal area traverse is not as accurate as the...

    The equal area traverse is not as accurate as the log-Tchebycheff but gives almost as good results and is a lot faster. The number of readings varies with the duct size. If you run comparison...
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    I had an engineer question a traverse because it...

    I had an engineer question a traverse because it showed the airflow on an AHU in a system he designed was low on airflow. I had a tough time finding a place for a good traverse and even drilled the...
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    For an acceptable traverse 75% of the readings...

    For an acceptable traverse 75% of the readings have to be within 10% of the maximum reading. Negative readings are acceptable and are added to the total as zero but will bogus a traverse in a hurry....
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    Your traverse is bogus. You need to find another...

    Your traverse is bogus. You need to find another spot.
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    You lost some replies. Your CFM calculation does...

    You lost some replies. Your CFM calculation does not give the actual airflow. Your calc gives the system curve but assumes the statics are developed by CFM. The fan can't do that so your CFM is a lot...
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    If you have 2000 FPM in your duct that will do a...

    If you have 2000 FPM in your duct that will do a good job with smoke. I don't think you will have a problem. I mentioned testing the hood because I would have been curious no matter how sure I was it...
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    That's a lot of work heatingman and it does take...

    That's a lot of work heatingman and it does take time but it is satisfying when finished and the way you want it. I wish I was close to you so I could help. I remodeled 3 houses and built 3.

    When...
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    Heatingman if you want to test the airflow the...

    Heatingman if you want to test the airflow the best way is pitot traverse. For small ducts I used a 12" pitot tube and instead of drilling holes in the duct used self tapping screws. The vel-grid...
  16. Your CFM calculation is way off. Do you have a...

    Your CFM calculation is way off. Do you have a fan curve?
  17. Did I understand you correctly? You have a fan...

    Did I understand you correctly? You have a fan rated for 122 CFM @ 100 pa total static pressure. With a total static pressure of 92+99=191 pa you are getting more than double the design airflow?
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    The hood looks great!! Did you calculate the...

    The hood looks great!! Did you calculate the performance of the hood? If you did it would be good if you posted the calcs. I know that can be done with enough experience but some of the newbees could...
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    I was about your age Bryan when I left design...

    I was about your age Bryan when I left design engineering and got onto TAB. I was in good physical shape and still am and could do everything that needed done. The first thing you have to do is take...
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    JayMan7 I'm a person people either love or hate....

    JayMan7 I'm a person people either love or hate. I try to be honest and don't beat around the bush. Unfortunately every where you work personality comes into play. Don't worry about that when...
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    You left out TAB. Tab is fun because you don't...

    You left out TAB. Tab is fun because you don't fight with the same people all the time you get to fight with everyone. The biggest challenge is when engineers think they can tell you how to do...
  22. All these guys have given you solid advice. I...

    All these guys have given you solid advice. I can't add much except maybe the way I always saw things. If you thoroughly enjoy something no matter how hard it is and how hard you work at it, it isn't...
  23. The biggest single improvement in the...

    The biggest single improvement in the gasoline/diesel engine was the result of the military needing to be capable of fording streams. They needed to vent the crankcase through the air cleaner so a...
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    ammoniadog the applicant brought up age not the...

    ammoniadog the applicant brought up age not the union. When ask where he expected to be in 10 years he should have said at the top of my game not retired. He gave them several outs with no liability....
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    With your experience without a doubt the best...

    With your experience without a doubt the best direction to go is commercial controls. You should also take an HVAC course to get a better understanding of what you are trying to accomplish.
  26. The cost of energy has been the main driver of...

    The cost of energy has been the main driver of energy conservation. Part of that was government intervention but it all started when the cost of oil skyrocketed and you had to wait in line to get...
  27. My point hvacker with vented attics is the heated...

    My point hvacker with vented attics is the heated air is lighter than the air just above the ceiling and if vented for the most part stays as high as it can and then goes out the vent. For that...
  28. The problem with trying to get winter heat from...

    The problem with trying to get winter heat from roofing is most attics are vented. Even if you heat the underside of the roof if it's vented the air rises and goes out the vents.
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    Those are the important kind of things people...

    Those are the important kind of things people need to know CircusEnvy. A lot of contractors won't share that kind of info.
  30. Hey what's this old guy stuff? Thought about...

    Hey what's this old guy stuff?

    Thought about it and by damn you're right.
  31. When I started driving all that mattered was fast...

    When I started driving all that mattered was fast especially off the line. The earth was just here.
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    In my area there was another manufacturer that...

    In my area there was another manufacturer that started going after the big buildings with a lot of HVAC equipment telling them they could save them big time on operating cost. I don't know how that...
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    You must have a big basement.

    You must have a big basement.
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    Do you guys routinely check for messages even if...

    Do you guys routinely check for messages even if you don't get an alert? This is the first time I've had any problem with it.
  35. Most manufacturers I worked with wanted a 3 year...

    Most manufacturers I worked with wanted a 3 year payback. They weren't going to be adventurous unless they could get it. I started driving when muscle cars were the rage and very few people wanted...
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    Artrose the micro-anemometer is a differential...

    Artrose the micro-anemometer is a differential meter. It will accurately measure pressures a lot lower than a standard diff press meter.
  37. Coal fired power plant effluents have been...

    Coal fired power plant effluents have been cleaned up a tremendous amount over the years. That's the reason you no longer see a pure panic to get rid of them.
    The use of government involvement in...
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    What happened beenthere is I got an alert for a...

    What happened beenthere is I got an alert for a private message and the alert said who it was from. When I tried to open it there was no new message. I had 42 saved messages that were listed. I was...
  39. Hey Poodle and Artrose how about elaborating on...

    Hey Poodle and Artrose how about elaborating on the new technologies. I'm not up on those things but if you guys are fill us in with as much as you can. I thought years ago that power generated from...
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    Private Messages

    A while ago I was alerted that I had a new private message. The alert was false but a lot of messages showed up that were not there before. They were all pretty old and I have no idea if I answered...
  41. Maybe for the long term Poodle but a bigger...

    Maybe for the long term Poodle but a bigger problem is the short term. What I mean is it will take a long time to retrofit existing structures with more energy efficient materials. Advancements in...
  42. Great post Artrose. I worked on a geothermal...

    Great post Artrose. I worked on a geothermal power plant years back. The nuts in that state harassed the company that wanted to build it to the point they cancelled the project. The politicians...
  43. To precipitate the different gasses out the...

    To precipitate the different gasses out the desired temperature is around -360 F but so what if you are already at -320 F. I'm sure there is a lot we don't know but it would be nice if they let us in...
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    Sorry about last night heatingman. I had insomnia...

    Sorry about last night heatingman. I had insomnia for two days and was afraid I might mislead you. I have only had that maybe three times in my life.

    The formula you want for SPGR'S other than air...
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    Glad you explained because I thought you were...

    Glad you explained because I thought you were going to use a micro-anemometer or maybe an inclined manometer. I have all the formulas you need and will look them up in the morning to make sure I get...
  46. What they didn't tell you is that -320 F is...

    What they didn't tell you is that -320 F is difficult to obtain as far as getting through the icing up stage is concerned. I doubt if they have the controls to do it automatically. It baffles me why...
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    Hey heatingman I saw this post a few minutes ago....

    Hey heatingman I saw this post a few minutes ago. Since you would be dealing with a gas correcting for SPGR is the right approach. Where I think the confusion is that the reference you gave is...
  48. As you have noted the energy has to be removed...

    As you have noted the energy has to be removed from the air to get down to the -320 F they reference. When used energy has to be added. Where the problems start is as the temperature gets to around...
  49. My first thought is they would be better off...

    My first thought is they would be better off selling the liquified gasses for a profit.
  50. Over the day there are too many variables and the...

    Over the day there are too many variables and the efficiency changes with several things starting with the load. controldude is right.
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