Jason,
Thanks for the suggestions. Tried those output objects before, but they report only to the building surfaces and fenestrations, not to the window shading devices. As for the hand calculation, its something i've thought about, but i'm not sure what to do with the temperature difference in that object you mentioned, since the absorbed heat by the shading is in the form of radiation (mostly at least, the air temperature wont be higher than the shading during the day), i would need an equivalent temperature for that dT. I was thinking about using these objects instead:
Window Convection Heat Gain from Shade to Zone [W]
Window Net Infrared Heat Gain from Shade to Zone [W]
I think it sums up the heat exchange between the zone and the shade, and from here apply the m Cp dT relation, with dT between zone air and shading. what you think?
BTW, i got a response from the authors of that paper that sparked all this: they say they obtained the temperature values of the blinds from the surface inside temperature object, using V4.0. maybe such a report was available on that version?
Pedro
On 13-01-2011 18:09, Jason Kirkpatrick wrote:
Pedro,
Will any of these work for what you are trying to accomplish?
Output:Variable,*,Surface Inside Temperature,hourly; !- Zone Average [C]
Output:Variable,*,Surface Outside Temperature,hourly; !- Zone Average [C]
Output:Variable,*,Surface Int Adjacent Air Temperature,hourly; !- Zone Average [C]
If not, maybe you could take the following output
Output:Variable,*,Window Solar Absorbed:Shading Device Energy,hourly; !- Zone Sum [J]
and calculate the temp by hand as Q = m C dT
where Q is energy absorbed by shade, m is mass of shading system, C is specific heat of material dT is change in temp
Hope this helps,
Jason
On Thu, Jan 13, 2011 at 7:44 AM, Pedro Peixeiro <ppeixeiro@xxxxxxx> wrote:
Hope so, even if its just a confirmation that it cant be reported. I've read recently a paper with results on shading temperature, wich just makes things a bit more strange. I've asked the authors about it, still waiting on an answer.
Pedro
On 13-01-2011 12:31, James V Dirkes II, PE wrote:Dear Pedro,
I do not know how to monitor the temperature of an internal surface. I doubt that it can be done. Perhaps others in the forum have an idea?
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Pedro Peixeiro
Sent: Thursday, January 13, 2011 3:11 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] window shade temperature output?
James,
I'm not looking for an air temperature. I was searching for the actuall temperature of the shading system (blinds) mounted on some of my glazings. I'm not using any mechanical system, just natural ventilation. If you feel your answer is still correct, then i dont see what you mean. if you could please explain it a bit further i would be very grate full. thank you
Pedro.
On 12-01-2011 14:28, James V Dirkes II, PE wrote:
Dear Pedro,
The air temperature that you want is present at a node in your air loop. Just ask for that node’s temperature to be reported!
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49 504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of pedro_peixeiro
Sent: Wednesday, January 12, 2011 7:09 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] window shade temperature output?
Hello everyone.
I went searching the I/O reference for a temperature outp ut object for a window blind shade system, but for my surprise i didnt find one. Is there really no output for this, or am i missing something? thank you for any help you can give.
Regards,
Pedro
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