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[EnergyPlus_Support] about Earth Tube



Dear Sir or Madam¡G
    I have some problems when I used EarthTube Model.I know there is
only one Earth Tube I can simulate in one zone, but when I set two
into one zone with different temperature range, it can really work.
The results seems strange, for example below.

 date    time     outdoor temp   Zone temp   Earthtube volume  Fan
electric consumption 
 01/05  23:00:00	6.9	15.1029888	1016.166881	   0
 01/05  24:00:00	7	14.96494867	0	           0
 01/06  01:00:00	6	14.88169027	0	           0
 01/06  02:00:00	7.2	14.9457758	0	           0
 01/06  03:00:00	7	14.90806222	0	           0
 01/06  04:00:00	7	14.89442756	1008.697663	   0
 01/06  05:00:00	6.1	14.58850598	0	           0 
 01/06  06:00:00	6	14.58853776	1046.670615	   0
 01/06  07:00:00	6	13.91390738	989.7873022	   0
 01/06  08:00:00	7.8	14.98749039	925.1847123	   0

Why does Earth tube have volumes but doesn't consume any fan energy
when I set two in one zone. If you know, please tell me. Thank you.


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