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a theoretical chimney question

  • 12-05-2009 7:24pm
    #1
    geordief
    Registered Users, Registered Users 2 Posts: 475 ✭✭


    I know that hot air drives the updraft but if the fire is not lit is there a natural movement of air up the flue? As long as the room is not airtight will there be a nutural updraft -and will it increase as the air outside above the chimney becomes windier?


Comments

  • #2
    fmcc
    Closed Accounts Posts: 225 ✭✭fmcc


    Geordie as long as the air in the room is hoter than the air outside it will rise up and create a draught fire on or not. It will also depend on the amount of fresh air into the room. Wind will increase the effect afaik but not as much as a hotter fire will.


  • #3
    anon1
    Closed Accounts Posts: 96 ✭✭anon1


    If hot air meets a cold chimney can condensation form and flow down the chimney?


  • #4
    demanufactured
    Closed Accounts Posts: 5,756 ✭✭✭demanufactured


    That would only happen if you had a smouldering fire going te whole time , say in a stove or ranger where you have the fire dampened down.

    In an open fire once you have a good fire going it couldnt happen because 80% of the heat goes up the chimney.


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