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Dear TRNSYS User’s, using the Integrated Model for Chilled Ceiling Panels
I’m not able to resolve some problems. My questions are: a) if I define only internal walls (test room for
cooling panels), how let I know the model the geometrics of the room
(perpendicular walls etc.)? b) can I define the emissivity of the internal
surfaces? (prEN 14240 stipulates an emission rate at least 0.9) c) the coefficients const and exp (Properties) are
done for the condition Tsurfceiling – Tairceiling < 0. but so I have
to apply the exponent for a negative value. It means only the amount, without
sign? – d) For calculate αconv with equation
6.3.2-157, the constant is done in KJ/m^2K, but multiplying with delta T,
remains KJ/m^2. I’m not sure if I understand rightly the units, so I have
a problem to change the default values (for achieve in the simulatione the same
results as the test of radiant panels). e) is the same model suited to be used for a heating
ceiling? The results of my simulation seems a little bit strange… Can anybody help me? Thanks very much. Bettina |