[TRNSYS-users] TYPE 56 - chilled ceiling

[Bettina Nocke]

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

 

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