[TRNSYS-users] chilled ceiling application

David,
I am trying to define the cooling capacity of the ceiling panel. This could be determined by the following equation:

Q=m*cp*(θout-θin)

I expected that changing the water flowrate and/or the water inlet temperature , the program would give me as an output the fluid outlet temperature (θout in the above equation).Using the above equation i could obtain useful results for the expected thermal behaviour of such a system (that is to say, if it does meet the cooling needs of the zone).

So , is there anywhere in the program the answer i am looking for (the fluid oulet temperature)?

Second thought

The designers of the ceiling panels say that these systems are designed for a temperature difference (of chilled water) about 2-4 K. If this is the case for the program as well, I expected to define this temperature difference somewhere in the program. Taking for granted that the cooling load equals to cooling capacity of the ceiling panel, I could then determine the mass flowrate needed.

Thank you for your answer.I hope I made clear the problem.Are there any suggestions?

Best,

Dimitris

National Technical University Of Athens
School of Mechanical Engineering
Thermal Section

Στις 02 Μαρτίου 2010 12:36 π.μ., ο χρήστης David Bradley <bradley@tess-inc.com> έγραψε:

Dimitris,
Is it the cooling capacity of the chiller or of the ceiling that you are trying to define?
Best,
David

Δημήτρης Ξεύγενος wrote:
Dear TRNSYS users,

I am working on a solar cooling project using an absorption chiller and the new feature of TYPE 56 (regarding to chilled ceilings).
How can i define the cooling capacity as i don't know the fluid outlet temperature?
Moreover,when i have to define the wall with the cooled ceiling layer , it is obligatory to define some parameters that are obtained by the producer of the cooled ceiling (specific norm power,norm massflow, norm area, norm number of loops)
Does this definition affect the cooling capacity i mentioned earlier?Could anyone send me these technical data from any producer available?

Thank you in advance,
Xevgenos Dimitris

National Technical University Of Athens
School of Mechanical Engineering
Thermal Section
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