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Re: [EnergyPlus_Support] Thermal Mass and Heat Balance Algorithm



Hi Konstantinos,

Theoretically speaking both methods are expected produce the same results but CTF method is much faster or requires less computational efforts.  The problem with CTF is that it may not converge for a construction which has thermally massive and highly resistive layers combination. But it is difficult to give which combination leads to convergence problem.  As a general rule of thumb if you are considering to investigate concrete layer thicker than 0.5m with additional insulation layer you need to watch CTF method carefully and consider testing it with Conduction Finite Difference for sanity check.

Hope this helps,
Bereket
From: konstantinosf <konstantinosf@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Friday, August 26, 2011 5:25 PM
Subject: [EnergyPlus_Support] Thermal Mass and Heat Balance Algorithm

 
Hello,

I would like to ask which is the most appropritate heat balance algorithm for modelling thermal mass (concrete layer with insulation layer on the outer surface, finishes included)or conducting a parametric analysis for the optimum thickness.

Using the Conduction Transfer Function i get lower temperature values than the ConductionFiniteDifference.

I am planning to use the Conduction Tranfer Method, any comments will be very helpful.

Thank you in advance,
Konstantinos Floros





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