[EnergyPlus_Support] Radint cooling system [2 Attachments]

[yasin khan <yasinkhan683@xxxxxxxx>]

Hello everyone

I have done a radiant cooling system modeling in one zone building (with fan coil unit to handle the latent load). The i turn off the radiant system and the complete building load is covered by FCU unit only to analyze the energy saving with radiant cooling system. But when i go for the temperature (MRT and Zone Air temperature)  analysis for both the cases i found that MRT for the second case ( Only FCU ) is very high as compared to with radiant system.

  

Cases                                                                      MRT                        Zone Air temperature  

(1) Radiant System with fan coil unit                         ~23.5                                     ~24.5

(2) Only Fan coil Unit                                             ~  29 C                                  ~ 24 C

Even if we consider that MRT is lower for radiant system than conventional air system but i think  the difference( ~5 C ) between MRT and Zone Air temp should not be so high for conventional system (Case 2) 

So anyone can explain me why it is happening ?

I have also attache the idf files of both cases so that modeling error could be find out.

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Attachment not found:
d:\eudora\attach\RADIANT+FCU.idf

Attachment not found:
d:\eudora\attach\Only FCU.idf