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Solar Slab Store design

perhaps in another thread or by direct e-mail. I suggest a new thread just for you so it will get the attention your question deserves.

This thread is regarding a particular fellow's question and specific application.


  • Greg_35
    Greg_35 Member Posts: 14
    I'd appreciate some feedback on the piping/components

    aspect of this design for a simple flat panel solar collector feeding into a concrete slab. I am looking more for design feedback more than mfg. specifications.

    I've done some investigation of Cedar Mountain Solar (thanks HR)use of direct slab heating when I began the project, and now am ready to build the "pumping station".

    The mixer is limiting the high temp input into the pex in the slab.

    Thanks in advance for your comments.

    Greg Durgin
  • ross cirrincione
    ross cirrincione Member Posts: 1
    roman floor heat

    this message is for Dan where do i find info re; this roman floor heat
    UNUSEXFER Member Posts: 6
    slab storage

    You need a storage tank.
  • Greg_35
    Greg_35 Member Posts: 14

    I should have explained the project a bit more initially.

    The radiant slab is designed to absorb the output of the panels and the application does not require a steady or set heating point. The objective with this garage/shop project is to maximize transfer of available BTUs from the collectors in fall, winter and spring. Thus no need for tank. The entire loop uses a glycol/H2O mix.


  • Mike Dunn
    Mike Dunn Member Posts: 189
    So what's your plan

    when either the air temp or the floor temp is satisfied and you still have btu's to harvest?

    Do you plan on letting the system run no matter how hot it gets in the space until the sun goes down?

  • Larry Weingarten
    Larry Weingarten Member Posts: 3,233
    If you...

    ... used some sort of proportional pump control, or PV powered pump, the system could be simplified it seems, by removing the mixing valve. I will suggest thick insulation under and around your storage. Keep it dry also, or the BTUs will find the wrong way out.

    Yours, Larry

    ps. Stay away form black chrome or any selective surface with your collectors to keep temps from going crazy.
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,853

    When you need it the most, you will get it the least...and, when you need it the least, you WILL get it the most, and you'd best have a plan to get rid of it, or you will regret doing it.

    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
  • hot_rod
    hot_rod Member Posts: 21,853
    a bit of storage, at least

    to provide DHW might be a good addition. It would also give you a place for the control (tank) sensor and allow for injection mixing from the tank. It may also provide a cooler return (higher efficiency) for the panels to operate.

    Also do some calcs with the summer time expected solar gains, to be sure you can lose the amount of BTUs the panels will collect.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
This discussion has been closed.