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Tank in Tank or Flat plate heat exchanger

  • 13-04-2007 1:02pm
    #1
    derekhandforth
    Closed Accounts Posts: 4 ✭


    I have underfloor heating throughought my bungalow, which operates at 50 deg C and the DHW mixer is set to about 48 deg C. This is run from a Gerkros woodpellet boiler. So I do not need water hotter than 50 deg C at any time, apart from a weekly blast to 60 deg C to prevent legionella.

    I am putting in solar connected through a buffer tank. My question is what is the best way to get the DHW either tank in tank or Flat plate heat exchanger. I have been told that a flat plate heat exchanger requires a full tank of water at much higher temperatures, eg a tank at 70 deg C to produce adequate flow at 50 deg C. The tank in tank is always storing the DHW at the correct temperature, so this is not an issue with it. But how is this inner tank heated, does it always require the outer tank to be much hotter as well, and what are the recovery times?


Comments

  • #2
    davidoco
    Registered Users, Registered Users 2 Posts: 655 ✭✭✭davidoco


    The easiest thing to do is fit a dual coil cylinder. DHW draw off temp will be maintained by the DHW mixing valve irrespestive of the temp in the cylinder.

    The underfloor heating will have it's own mixing valve. The water in the primary part of the heating circuit will be somewhere between 60 and 80 degrees. I haven't seen a Gerkros but it's unlikely that you can set the heating water circuit temp below 60.

    From the first line of your post you seem to be thinking that the DHW and UFH temp are the same water source. Can you clarify that you actually have a stored DHW cylinder with a single coil.


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