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mixing valve

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Brad White
Brad White Member Posts: 2,398
is the simplest alternative that I can think of, the other being a plate exchanger. For the expense and time of moving the circulator, what is holding you back? Is there another reason not to be moving it? Also, to do injection right, a smaller pump or variable speed may be the best thing. Otherwise you are going bang-bang on-off to the detriment of the circulator over time.

All in all, I see a mixing valve being your best bet.
"If you do not know the answer, say, "I do not know the answer", and you will be correct!"



-Ernie White, my Dad

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  • Jim H
    Jim H Member Posts: 3
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    mixing valve?

    Piping a system and want to see what others opions are for piping a low temp loop tied to higher temp loops. The first three pumps are for joist plates and the last pump is for basement slab. There will be outdoor reset so the joist water temp will be as low as possible. What ever mixing device is used I would like it after the pump, I don't what to change the current layout. Thank you.
  • Brad White
    Brad White Member Posts: 2,398
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    By definition

    The way you have it now, all zones will have the same temperature. Any mixing device you use will have to be upstream (inlet side) of any circulator.

    Think of it this way: Drawing into a valve can blend proportions of two temperatures; both free ports are "in ports" so that this can happen. The "out port" belongs to the circulator. Two in, one out.

    Pumping into a valve only can divert flow. One in, two out. There is no possibility for inflow for mixing to that zone (unless this last one is injecting into yet another circuit).
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • Jim H_2
    Jim H_2 Member Posts: 1
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    injection

    Injection would be the only option to lower the water temp downstream of the pump? I didn't want to use a mixing valve because of moving the pump. Was curious if there was some alternitive or option to limit water temp for slab on last loop.
  • Jim H
    Jim H Member Posts: 3
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    Thanks for the input. Nothing against mixing valves just was looking for alternatives that might make piping simpler for the techs and having all the pumps in a row does look nice. It is such a small load for the whole job I thought there may be some new device or something on the outlet of the pump. Everyday there are new gadgets and ways to pipe things that I still need to learn. thanks again
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