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[EnergyPlus_Support] Why T becomes so low





Attached is our IDF file.  It is a 5-story building with two chillers for cooling and electric heating.  The srange thing is that the simulation shows that the zone T is well controlled as the schedule defines in winter (20 degree C).  However, in summer the schedule wants to maintain the zone T at 26 degree C but the output shows that the T overshoots to 20 degree C.
 
We replaced the HVAC system with IdealSystem and the zone T is well controlled.  I guess this means that the schedule has no error.
 
We have been working on this problem for several days and are really puzzled.
 
Please help.  Thanks!
 
XS
 


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Attachment not found:
d:\eudora\attach\09-06 proposal.idf