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u-value

  • 04-02-2011 9:55pm
    #1
    kildareman09
    Closed Accounts Posts: 115 ✭✭


    in construction studies mock our teacher has told us its on it but he hasnt thought us it yet and said we need to look over it ourselves could anyone tell me what to do to work it out


Comments

  • #2
    readystudypass
    Registered Users, Registered Users 2 Posts: 204 ✭✭readystudypass


    Are you doing the higher paper? Have a look at Question 5(a) from last years exam. The marking scheme on www.examinations.ie gives the formulae and the table you need to remember before you plug in the numbers


  • #3
    kildareman09
    Closed Accounts Posts: 115 ✭✭kildareman09


    yeah i am would the formula be in log tables or is it 1 you have to learn off


  • #4
    readystudypass
    Registered Users, Registered Users 2 Posts: 204 ✭✭readystudypass


    kildareman09 wrote: »
    would the formula be in log tables

    page 58


  • #5
    The Shtig
    Registered Users, Registered Users 2 Posts: 269 ✭✭The Shtig


    Remember to write down the measurements in metres e.g if it says 100mm outer leaf then it's 0.1 or say 65mm insulation it's 0.065.

    Always double check the figures, I usually mess up with this part and it's silly marks to throw away.

    Don't panic with the second part of the question, it's a lot easier than it seems and is almost the same lay out. I can't remember the exact lay out because I'm away from home but like the post above you should find it on the marking schemes.

    It just takes practise and is really easy to get the marks.

    For the last part (C) it usually asks how to improve the u-value so learning the different methods e.g pumping the cavity, dry lining or strapping insulation to the outside cavity. A diagram and a few good notes on the method will be enough for full marks.

    Sometimes they ask about thermal mass. I'm not the best at explaining it but during the day concrete floors and walls absorb heat and then during the night it releases this heat. Check your book for a better explanation!

    Get onto your teacher after the mocks to go over it, stupid for him not too since its asked every year. Then practise even just once a week and you'll be set for June.

    Best of luck!


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