[TRNSYS-users] cooled ceiling

[Julie Lestrade]

Dear TRNSYS users,

I have a question regarding the modelisation of radiant ceiling (in this case to cool a room). I have found in the TRNSYS manual that we can use a specific layer (called cooled ceiling). 

I have some troubles though to figure out what some parameters are about.

For pipe spacing and inside diameters that's quite obvious, same for specific norm power. 

- But when you sau "specific norm massflow" is it different from the massflow we can indicate in the "specification" of the roof (ie : the inlet massflow). 

- What about the norm area ? Is this supposed to be the area of one radiant panel ? how do you know the number of panels then ? how does it relate to the area of the roof ? 

- What about the number of loops ? how is it different from the number of fluid loops that we indicate in the specification (new button that appear in the wall definition window) 

- what about the Urwx coefficient ? I've read the help document (also availaible when clicking on info) but I really don't get it ... according to the button we tick, the result is different. Is it a specificity of the radiant ceiling (assuming we have a tipical roof above ?

- what is the influence of the airgap ? 

Then, when the modelisation is done, and running, is it possible to know the temperature of the outlet (every hour) as well as the cooling power that it represents ? 

thank you for your answer
Best regards

Julie
Julie LESTRADE
Ingénieur d'études

CEDRE
Ophira 1, 1 Place Bermond
06560 SOPHIA-ANTIPOLIS
Tel : 04 92 96 03 77
Port : 06 45 68 07 53



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