Re: [EnergyPlus_Support] deciduous trees

["Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

I am not aware of any "wind shielding" objects in e+. You can assign Wind Pressure Coefficients to each surface, but you need a CFD or another simplified calculation (there is one in the AFN section) to get those. And run with the AirFlowNetwork. (AFN) 

Wind exposure can be assigned as a static multiplier or wind/no wind and sun/no sun. 

And i think there is a site level building exposure setting as well. 

Sorry for being vague... No documentation on my phone. 

On Sat, 30 Jun 2018, 06:03 Joe Huang YJHuang@xxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support], <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Forgot to add another comment to see whether EP takes the wind direction into account in adjusting the wind speed. I simply don't know, so it would be nice to find out.

Sent from my iPad

On Jun 29, 2018, at 9:00 PM, Joe Huang YJHuang@xxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

I don't see anything particularly wrong with the charts.  Trees have two effects on the building: (1) shading of solar radiation, and (2) wind-shielding on the wind speed.  The latter in turn reduces the infiltration as well as conductive heat transfer by increasing the exterior air-film  resistance. If you are still doubtful, you can check the solar fraction due to the shading (should be low during the summer and higher but not 1.00 during the winter) as well as the local wind speed..

Joe

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On Jun 29, 2018, at 7:11 PM, Koji Takemasa koji_takemasa@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Hi.

The x axis shows the month and the y axis shows the time. I understand this year's change well so I am using this graph.

On 2018/06/30 9:31, Joe Huang YJHuang@xxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support] wrote:

 

What's the X-axis on the two plots? I assume the Y-axis is the Hour of Day. Also, what temperature is being plotted? 

Joe

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On Jun 29, 2018, at 3:20 PM, Koji Takemasa koji_takemasa@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Hi.

I am interested in how deciduous trees will affect room temperature. So
I simulated with EnergyPlus using a simple model.

I am at a loss for results I can not understand. I did two kinds of
calculations. One is the case without deciduous trees and the other one
is deciduous trees.

Then the room temperature in January resulting from the absence of
deciduous trees and the room temperature in January with deciduous trees
are greatly different. I thought that room temperature in January was
almost equal.

I will attach two results and an idf file. Please tell us where you are
mistaken.

Koji Takemasa

--
Name : Koji Takemasa (Ph.D.)
Mail : koji_takemasa@xxxxxxxxx
http://www.lead-labo.jp/
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<room temperature.pdf>

<base01.idf>

-- 
Name : Koji Takemasa (Ph.D.)
Mail : koji_takemasa@xxxxxxxxx
http://www.lead-labo.jp/
------------------------------

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Posted by: Jean Marais <jeannieboef@xxxxxxxxx>

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