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Time lag in relation to thermal mass??

  • 16-10-2011 6:26pm
    #1
    jimmy11
    Registered Users Posts: 66 ✭✭


    does anyone no the formula for calculating time lag with regards to thermal mass ?

    searched alot of places but getting varied answers thanks


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,145 Mod ✭✭✭✭BryanF


    jimmy11 wrote: »
    does anyone no the formula for calculating time lag with regards to thermal mass ?

    searched alot of places but getting varied answers thanks

    sounds like your getting in to computer simulation territory:) both DEAP and PHPP make a stab at these, but ive never actually tried to work them out..
    all i know is you've got the thermal admittance (y-value) .. units w/m2k... then you've got to take into account thermal conductivity and specific heat capacity.. then the thermal mass parameter ie a measure of thermal mass calculated from what's given off by each materials thermal admittance

    contact heinbloed over in DIY he'll most likely have the answer:)


  • #3
    jimmy11
    Registered Users Posts: 66 ✭✭jimmy11


    thanks for your reply, yea i can see how im getting more towards computed stuff! Im doing my FYP on thermal mass and need calculations for timelag in order to build up the theory etc.

    I will pm him and see can he help cheers mate


  • #4
    sydthebeat
    Subscribers Posts: 41,915 ✭✭✭✭sydthebeat


    check out "decrement delay" as a topic in google.

    the lag depends on may factors but mostly the thickness and actual material involved, and that materials ability to store energy.

    also see here


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