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Type: Posts; User: bradluke0

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  1. Replies
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    It would be nice if the OP would follow up here...

    It would be nice if the OP would follow up here so we could all see where this is going.BTW....lots of good advice given above .
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    I prefer the Alnor and Evergreen for air and...

    I prefer the Alnor and Evergreen for air and Shortridge for water . When balancing air the guys like the blue tooth connection to their phones with the Alnor and the wrist reporter with the Evergreen.
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    Wayne is correct. Is this steam or hot water?

    Wayne is correct. Is this steam or hot water?
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    I have been out of the field for a while and have...

    I have been out of the field for a while and have never seen this particular valve . I can find out on Monday from my sources. Let me know if you need me to do that .
  5. I worked for a company many years ago that wanted...

    I worked for a company many years ago that wanted to pay me $40,000 with a year end bonus to increase that to around $60,000 ( this is Florida so the numbers are lower than almost anywhere ). I knew...
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    How about the part where my buddy had to traverse...

    How about the part where my buddy had to traverse 75 100cfm exhaust fans? Nobody sees a problem here? In my opinion when you make your competitor do something like that it's only to waste his time ,...
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    The problem with attacking the commissioning guys...

    The problem with attacking the commissioning guys is that the owners back them all of the time . Some of them have been commissioning and balancing for a long time so they are not newbies . They are...
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    If I didn't know the technical side of the...

    If I didn't know the technical side of the business , there is no way I would get involved .
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    If the submittal or other documentation says 6000...

    If the submittal or other documentation says 6000 cfm minimum then there may be a good reason for that . It would be nice to have a sequence of operation that spells out what is supposed to happen ....
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    Good work but just use the linear way . New hertz...

    Good work but just use the linear way . New hertz ÷ old hertz x old rpm = new rpm .
  11. Replies
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    Icy nailed it . Also, is this unit on a vfd? If...

    Icy nailed it . Also, is this unit on a vfd? If so , you can measure the rpm once and calculate the rpm from the hertz of the vfd at different settings.
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    Looks like you are getting somewhere . If you can...

    Looks like you are getting somewhere . If you can unload all the way to 16% then your theoretical minimum would be right around 2000 cfm . 4300 cfm for a minimum has plenty of safety built in . 6500...
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    Has anything been determined here yet ?

    Has anything been determined here yet ?
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    Why is it taking 3" of static to get the correct...

    Why is it taking 3" of static to get the correct air through the boxes? Are there manual dampers in front of the boxes ? Are the down stream dampers at the air distribution partially closed ? ...
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    Good going . I would take that new duct pressure...

    Good going . I would take that new duct pressure sensor and install it closer to the unit instead of way at the end . Like Wayne said if the minimums are 10-15% they need to be raised . If there is...
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    I have never tested a pump running backwards so...

    I have never tested a pump running backwards so this is a new one on me...propeller fans and the like are a different animal.
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    The chart needs ESP and fan RPM to determine...

    The chart needs ESP and fan RPM to determine airflow. Is this a draw through or blow through unit ? With 2.3" of supply static and the flooding back , you are low on airflow . Your VAV boxes are not...
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    40 - 60 % when running backwards .

    40 - 60 % when running backwards .
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    The responses you have already received have...

    The responses you have already received have pretty much nailed it . The only thing I can add is don't believe any readings you see on the DDC system . Take some baseline readings and check the...
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    You can have return air in OR's. The filter...

    You can have return air in OR's. The filter requirements are different if you have return air or exhaust air .
  21. Thread: FPB's

    by bradluke0
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    OK ….The system I am talking about has 10 boxes...

    OK ….The system I am talking about has 10 boxes with a design of 1000 max and 400 minimum each , the ahu is designed for 10,000 cfm . The good part about this system is the ahu will never deliver...
  22. Thread: FPB's

    by bradluke0
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    817

    You are correct ( again ). Sometimes the velocity...

    You are correct ( again ). Sometimes the velocity pressure can be so low that the box will not control . Luckily the controls have improved as well as the flow ring and/or pickup tubes . Ill get back...
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    We find the date of construction and use the...

    We find the date of construction and use the requirements as of that date . The plans will give you the cfm requirements and after you measure the cubic feet of the OR'S you can calculate the...
  24. Thread: FPB's

    by bradluke0
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    817

    And here we go …. I really don't want to do an...

    And here we go …. I really don't want to do an actual step by step process as I have tried that before and I always forget stuff . I think most everyone can balance a pressure independent single duct...
  25. Thread: FPB's

    by bradluke0
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    817

    That's a good story for sure . Would it be...

    That's a good story for sure . Would it be interesting if I shared my thoughts on how to properly set up a simple vav system ? I could go through the process and you guys could comment as I go along ?
  26. Thread: FPB's

    by bradluke0
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    817

    Its a crazy idea for sure , I would love to see a...

    Its a crazy idea for sure , I would love to see a sequence of operation to see if this is really the intent . I really like setting up series fan powered boxes . When the piece of paper falls off the...
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    agree 100% ^^^^. I led them in the direction...

    agree 100% ^^^^. I led them in the direction that with all 2-way valves we would just let the control valves dictate where the water went . There is no way I would even attempt to set all those...
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    You obviously spent more time thinking about this...

    You obviously spent more time thinking about this than we did . Your point makes much more sense but we wanted to see heads roll.....lol.
  29. Thread: FPB's

    by bradluke0
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    817

    I have never seen series fan powered boxes...

    I have never seen series fan powered boxes controlled like this . I wonder how they are going to modulate the fan and keep the plenum pressure neutral ? Do you have a sequence of operation to share ?
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    water balancing

    On another thread I mentioned a project I had with hundreds of exhaust and make up air grilles and the struggle to balance them to 25 cfm each ( which was impossible to do ) . This same project had...
  31. ^^^^ This is why the 1st stage should always be...

    ^^^^ This is why the 1st stage should always be the bottom coil . Also , I may be nit picking here but its not the static that pulls the water off the coil , its the velocity ( assuming a clean coil...
  32. Are you reading the airflow at the inlet of the...

    Are you reading the airflow at the inlet of the fan ? If so, that explains it .
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    71CHOPS hit it on the head. Sometimes it's...

    71CHOPS hit it on the head. Sometimes it's interesting to ask about the business side of things, this is just one example .
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    We all know that having this coil piped backwards...

    We all know that having this coil piped backwards is hurting performance. Why hasn't the contractor been notified and have him correct it ? I'm kinda at a loss here. Does he know it's backwards and...
  35. Ok , now I have my enthalpy chart in front of me...

    Ok , now I have my enthalpy chart in front of me . 3400 CFM X 7.71 DELTA TH X 4.5 ( CONSTANT ) = 117, 963 BTU/HR which is 9.8 tons . No way Jose . If I make an educated assumption that it is...
  36. I agree with this . Also , a 5 ton unit is not...

    I agree with this . Also , a 5 ton unit is not going to do 25 tons . It will probably would do 6 or 7 tons if the entering wet bulb temperature is really high and its cool outside . The temperatures...
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    Those drum diffusers ( we used to call them punka...

    Those drum diffusers ( we used to call them punka diffusers ) probably have six or so vanes to spread the air horizontally . Also , the airflow can change drastically if the face damper is moved just...
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    If you show up on time and do good work you don't...

    If you show up on time and do good work you don't need a slogan .
  39. Whats the pumping situation? 2 pumps ? 1 pump ?...

    Whats the pumping situation? 2 pumps ? 1 pump ? If 2 pumps are both running all the time?
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    You can figure out what negative static you need...

    You can figure out what negative static you need to draw in the required amount of outside air and make that your setpoint . Are the six ahu's ducted in parallel with each other ? Do the ahu's ramp...
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    How are they controlling the outside air ?

    How are they controlling the outside air ?
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    We are using the Fuji meter , it is badass. It...

    We are using the Fuji meter , it is badass. It logs , reads wall thickness , etc . It's not cheap though .
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    Are these split coils or serpentine coils ? If it...

    Are these split coils or serpentine coils ? If it is split coils you could block off the top coil which should be stage #2 . Then you can slow the fan down to obtain a leaving air temp of less than...
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    I use the general loss if the coil is piped...

    I use the general loss if the coil is piped backwards is 3% - 4 % per row . BTW , I agree with pretty much everyone above . I also agree that with planning and pre-fabricated pipe its a fairly easy...
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    The great ( or bad ) thing about T&B is there is...

    The great ( or bad ) thing about T&B is there is more than 1 way to get it done . I always try to make sure all the temperatures are correct . The pressure drop can tell you that you think you have...
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    What to believe ?

    I going to jibber jabber about my thoughts on water systems . Let's say you have a chilled water system with a chiller , a pump and a half dozen airhandlers . The pressure drop on the chiller says...
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    The problem with the unit was that the coil had a...

    The problem with the unit was that the coil had a little higher than design pressure drop at 20-25% low of design . We first thought the coil wasn't protected properly during construction and was...
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    In my opinion the practical exam is very...

    In my opinion the practical exam is very necessary , as one purpose of the CP is to be able to teach others how to balance . I know many engineers who could pass the AABC exam and the written...
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    I agree with Wayne. The low limit will be around...

    I agree with Wayne. The low limit will be around 70 to
    100 cfm per kw. Sometimes you have to play around with the airfow switch to get it to close .
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    2 very thoughtful posts above . I am very...

    2 very thoughtful posts above . I am very strongly against a cx agent who is also my balancing competitor . It is conflict of interest if he works for the owner and can also benefit financially by...
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