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Very Nice

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Comments

  • ChrisChris Posts: 2,869Member
    I'm Not Suggesting

    Anything other then to wait on judgement until the entire piece unfolds. I will though share my opinion that I feel Delta-T is better then Delta-P in on/off zoned systems where as Delta-P is better then Delta-T in constant circulation systems with TRVs or 3-Way Zone Valves.



    I think it is a matter of preference and opinion whether one is better then the other or wrong or right dependent on the application. In the end both will do the job which is to move btu/hr.
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
    · ·
  • Paul48Paul48 Posts: 2,452Member ✭✭✭
    According

    to Wilo's instructions....Where the systems head is unknown, they recommend starting with 10 as a set point. I guess you'd have to instruct the homeowner on how to fine tune based on system performance.With a minimum shut-off head(zero flow) of 4, would this circ even work for Mr. Barba's 1 or 2 zone only examples?
    · ·
  • hot rodhot rod Posts: 3,941Member ✭✭✭
    Smart Pump webinar

    presented by PME magazine. From what I viewed yesterday, the ∆P circs work just as well with on/ off zone valves as TRV. If you select the correct product and settings.





    http://www.pmengineer.com/events/category/2141-webinar
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
    · ·
  • GordanGordan Posts: 891Member ✭✭
    Of course it would work

    If it were set with H=5, then shut-off head is 4.5 and the pump would circulate roughly 1.5 gpm through that little zone. The zone would be overpumped by 50%, in other words. But that zone would be overpumped by as much even when all the zones are calling. And it would be overpumped by as much at near-design conditions no matter which circulator you use (yes, even the Bumble Bee) for one simple reason: flow has not been appropriately balanced.
    · ·
  • Paul48Paul48 Posts: 2,452Member ✭✭✭
    Wonder

    Why they do that when it says the ECM is capable of maintaining pressures equivalent of between 1 and 16 ft? Curious
    · ·
  • ChrisChris Posts: 2,869Member
    I Watched The Webinar

    Please correct me if I'm wrong but that Auto pump was still operating on a pump curve. It just has a lot of them it can follow. Again, please correct me if my logic is wrong.



    System needs 10gpm with 3 Zones 2,3,5 for flow rates and zone 5 has the highest head requirement. If zones 1 and 3 are open I would over pump Zone 1. Just grasping the concept not saying it's right or wrong. While yes the Delta-P pump would work that little flaw shows it's best in a constant circulation system.



    Thanks for the link HR, I enjoyed the webinar.
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
    · ·
  • hot rodhot rod Posts: 3,941Member ✭✭✭
    if you want to "nail"

    an exact flow rate a PIBV can work well with a ∆P circ. pages 48- in this journal explains how they work together.



    This is one of the best Idronics issues in my opinion, balancing is an often over looked part of hydronic design.





    http://www.caleffi.us/en_US/caleffi/Details/Magazines/pdf/idronics_8_us.pdf
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
    · ·
  • EastmanEastman Posts: 618Member ✭✭
    hmmmm....

    had to do it
    jpg
    jpg
    hrmmmmm.jpg
    0B
    · ·
  • GordanGordan Posts: 891Member ✭✭
    edited April 2013
    I don't know, Paul

    You'd have to ask the people who wrote the manual. They contradict it in at least two different places.



    If they could turn it down to 2', would you set it that way? That would be a good way to make sure that your higher head loss zones don't get the flow they need. Or you could balance your branches and have appropriate zone flow regardless of total system demand. Yes, I know, people don't balance their circuits, they don't do heat loss, they don't use outdoor reset or set it correctly, they don't calculate flow and head loss, they don't glue or prime their venting, they don't use oxygen diffusion barriers, they don't pump away... sheesh, scorched air is starting to sound pretty good! Luckily, now we have a product that will single-handedly right all these wrongs. But will it put down the toilet seat after someone leaves it up?
    · ·
  • Paul48Paul48 Posts: 2,452Member ✭✭✭
    LOL

    You forgot....They don't even open the I&O.
    · ·
  • R ManninoR Mannino Posts: 360Member ✭✭
    I've Had The Constant Ring

    of the song Girl Talk stuck in my head all week..............thanks Giovanni ! :-)
    · ·
  • billbill Posts: 429Member
    Same

    I'm wondering if the tune was the inspiration for Valley girl by Frank and Moon unit. Although Frank was all original and a genius.
    · ·
  • R ManninoR Mannino Posts: 360Member ✭✭
    Good Morning

    There are some things you can't cover up with lipstick and powder....................Damn here we go again.
    · ·
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