Not too long ago, there was a thread of conversation regarding a simple way to calculate the COP needed for a DX coil so that a desired EER would result in EnergyPlus output. For example, if you want your DX system to have an EER of 11.0 so as to meet minimum ASHRAE 90.1 efficiency, what coil COP should be used?
I posted something on this topic a week or two ago, but can’t find it, so I’m posting a new message after some very helpful discussions with Bereket Nigusse of the Help Desk and updating the spreadsheet I use for these calculations.
I hope that it is helpful to many of you!
· Make a successful auto-sizing run and determine “nominal” coil capacity and airflow
· Enter the nominal capacity, airflow and desired system EER in the spreadsheet to have it calculate the “Req’d COPe+”
· Use the “Req’d COPe+” as the DX coil COP in your IDF.
· Expect perfect EER calculation without trial and error!
James V Dirkes II, PE, BEMP, LEED AP
I can't understand well about bean shape roof. is it mean circle?
I recommend you that check a BuildingSurface:Detailed in IDF file.
That's a list of surfaces and surface's detail.
And that consist with Vertices coordination. These mean points of each surface.
for example, rectangle made by for point.
Than if you make circle shape surface, that consist with a lot of point.
Then it will make some warning or error.
If you want a making of bean-shape roof(if it means half circle roof) you should change to triangle shape or polygon shape.
I want a it will be help for you work.
Thanks. Would a bean-shaped roof without skylight also have this warning?
It is hard to mentally picture the "shadow clipping". I believe the warning is saying that non-convex receiving surfaces may result in inaccurate shading, but as shadow clipping is not the same as ray tracing, it is hard to visualize. Does the .shd file post a geometry of the shadow which I can then import with OpenStudio to better visualize where the program is placing shadows? That would be an interesting implementation.
Mit freundlichen Grüßen- Sent from my iPhone (excuse the brevity)
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