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[EnergyPlus_Support] problem with thermal radiation



Hi,
I investigate on thermal radiation and its effects
I have two alternative materials
1- external wall ( with two metal layers)
2- external wall2 (with out metal)
The difference between two simulations  was very poor and thermal radiation energy loos by the wall that has this material wasn't change.

A9C38D:Surface Ext Thermal Radiation Heat Loss to Outdoors [kWh](Monthly)
  with out Reflector  with Reflector
January 108.8691475 108.8541296
February 128.5922864 128.6258381
March 251.0705809 250.9363295
April 395.7446768 395.1045226
May 566.9424429 567.0461548
June 587.9205448 587.9979196
July 638.0636581 638.0444506
August 516.8364084 516.6539877
September 348.7579962 348.6593856
October 215.2195033 215.3210677
November 122.2107265 122.2722356
December 90.07916896 90.1409641


do you have any idea?


what should i do to have better result for radiation
i attached my IDF file
thank you in advance for your time
REZA




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Attachment not found:
d:\eudora\attach\test alt 04.idf