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Different outdoor temperature in the same weather data in EnergyPlus

asked 2020-01-24 11:25:54 -0500

rezaei2 gravatar image

updated 2020-01-25 13:35:43 -0500

Hello,I ll be appreciate if anybody could answer my question. I used the same weather data, and run periods for 2 buildings.But after the simulation the results of weather in peak are different, such that " outdoor Temperature at Peak",and Outdoor Humidity Ratio at Peak Load in some zones. There are 2 different systems HVAC (GLHP with a VAV system, Boiler and chiller with a VAV system), but the same building(Materials,schedules of lighting...etc). I attached the images of 2 systemsو and I've highlighted the zones have the problems. Buildings have the same zones (5 zones),and geometries. Thank you, image description(/upfiles/1579887062505534.png)image description

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@rezaei2 - Do you have SizingPeriod:DesignDay objects? If so that's probably the first info you see in the table, the second one is probably from the weather file. PS: I just pasted your pictures into your original post since they're not part of a answer. I couldn't delete the answer though.

Jeremy gravatar image Jeremy  ( 2020-01-24 12:28:47 -0500 )edit

The sizing period:Design day are same(They have the same Design day). I added the design image in bellow.

rezaei2 gravatar image rezaei2  ( 2020-01-24 12:40:53 -0500 )edit

What I suggest is that the "weather condition" info ("design day name" column) correspond to data based on the weather file, not from the SizingPeriod:DesignDay. You can see that for the "weather condition, the date and time of peak is different for both buildings, the peak occurs at different times.

Jeremy gravatar image Jeremy  ( 2020-01-24 13:05:23 -0500 )edit

Thank you so much Jeremy.I'll check that.

rezaei2 gravatar image rezaei2  ( 2020-01-24 13:37:14 -0500 )edit

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answered 2020-01-24 11:26:39 -0500

rezaei2 gravatar image

updated 2020-01-24 12:44:15 -0500

image description(/upfiles/1579887062505534.png)image descriptionimage descriptionimage description

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Asked: 2020-01-24 11:25:54 -0500

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Last updated: Jan 24 '20