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Francesca, There are numerous ways of modeling walls both within TRNSYS and beyond the components that TRNSYS offers. I think it would be worth informing yourself about those modeling methods so that you can apply your data to the most appropriate of them. The simplest wall model accounts only for the wall's thermal resistance and discounts the wall's ability to store energy. It would be relatively easy to use simple equations to tune such a wall model's transmittance (thermal resistance) to match your data. You would not even need a Type. I don't think you'd get a very good fit for your data, however, because walls do have thermal mass. You could use a generic lumped capacitance model such as Type963 in the TESS Loads and Structures library in order to account for the thermal mass of the wall as well as its transmittance. However, with such a model you would be discounting where in the wall the mass is located (i.e. the fact that most walls are made up of different layers whose material properties can differ significantly from one to the next. Type56 uses a conduction transfer function coefficient wall model. Applying your data to such a wall model and backing out the CTF coefficients would be an interesting and non trivial research project in itself. Beyond the CTF wall model there are also finite difference wall models and I am sure others of which I am unaware. regards, David On 4/21/2015 4:33 AM, Francesca
Pagliaro wrote:
-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |