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What tank to use

  • 24-08-2011 11:27pm
    #1
    moan 77
    Registered Users, Registered Users 2 Posts: 180 ✭✭


    I have 60 solar tubes feeding down to a 300 lt s/steel water tank I thinks it's unvented type, however I'll also have a stove with a back boiler output around 3/4 kw, my question is what size tank should I use and should it be vented or unvented??.


Comments

  • #2
    Condenser
    Registered Users, Registered Users 2 Posts: 536 ✭✭✭Condenser


    moan 77 wrote: »
    I have 60 solar tubes feeding down to a 300 lt s/steel water tank I thinks it's unvented type, however I'll also have a stove with a back boiler output around 3/4 kw, my question is what size tank should I use and should it be vented or unvented??.

    If its a stove it has to be vented due to the very high temps that are possible and the limitations on control.


  • #3
    DoneDL
    Closed Accounts Posts: 902 ✭✭✭DoneDL


    Vented and the tank will or should have sized to match the output from the solar system.


  • #4
    quentingargan
    Registered Users, Registered Users 2 Posts: 1,627 ✭✭✭quentingargan


    Vented, and probably triple coil. The twin coil solar tanks on the market are almost all 22mm coils, whereas your solid fuel ideally should have a 1" coil. If you have a second heating system, it would use the remaining coil.

    In terms of sizing the cylinder, water hardness has a role to play. If you have hard water, you really shouldn't let it get over 60C. If the water is soft, you can let the hot water in your cylinder to go 85C, allowing you to use a smaller cylinder if needs be. Tubes are particularly suited to this higher temperature.

    You don't say what size your tubes are - there are three popular sizes on the market, 47mm dia by 1.5m, 58mm dia by 1.8m and 70mm dia with a small flatplate inside them. However, the tube supplier should have been able to recommend a cylinder size.

    Roof orientation and direction also come into play a little.

    You should also incorporate a heat dump circuit on the solar circuit (requires just a large radiator and a high temperature motorised valve - the controller will usually have a spare relay to work this). That will prevent the system over-heating, and will give the system a longer life.


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