Hello Alberto.
I believe you're viewing the wrong outputs to verify your control. Zone Diff Solar from Exterior Windows and Beam Solar will give you the amounts of radiation that enter the zone and not the radiation that will arrive at the window for each timestep. Try using the "Difuse Solar" and "Direct Solar" outputs.
I hope someone with more experience and knowledge steps forward to confirm if this is the problem or not, I'm still very "green" in E+. Anyway, untill someone does, you might want to try that.
Regards,
Pedro.
To: energyplus-support@xxxxxxxx; EnergyPlus_Support@xxxxxxxxxxxxxxx
From: ahneto@xxxxxx
Date: Wed, 3 Mar 2010 14:26:01 -0300
Subject: [EnergyPlus_Support] Use shadowing control
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To: energyplus-support@xxxxxxxx; EnergyPlus_Support@xxxxxxxxxxxxxxx
From: ahneto@xxxxxx
Date: Wed, 3 Mar 2010 14:26:01 -0300
Subject: [EnergyPlus_Support] Use shadowing control
Dear E+ users,
I am using shading control introduced into the
Windowproperty:Shadingcontrol where I set the folowing parameters:
1) Shading control type:
OnIfHighSolarOnWindow
2) Setpoint: 100 W/m2
Looking at the E+ Input/Output reference I check
that, for such control type, the shading is on if
beam plus diffuse solar radiation incident on the window exceeds SetPoint
(W/m2).
After the simulations, I was trying to check if the
control was operating properly but I don´t know which variable I can use to
check that. First, I use "Zone Diff Solar from Exterior Windows" and "Zone
Beam Solar from Exterior Windows" and I compared the values of these variables
with and without the shading. I noticed, between 8 and 9 A.M. for a specific
external window, that there is a difference on the values of such variables but
when I added the values of the beam and diffuse radiation and divdided by thw
window I reached a value of 13,5 W/m2 but I was expecting something close to 100
W/m2 when the shading should start operating. Any ideas which variable I should
check in order to evaluate the proper operation of such shading?
Thanks for any help.
Alberto Hernandez Neto
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