Tilt Angle and shape of Add Rooftop PV measure in Openstudio

asked 2017-02-15 03:35:48 -0500

shahin1992

559 ●1 ●9

updated 2017-08-05 07:55:26 -0500

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

i'm having a school assignment in which i need to add ov to my model. I had a previous problem in calculating the Shading effect of solar cells but i figured out that there is a new Osm Measure Add Rooftop PV that gets me both the energy generated and the shading effect on thermal loads but i still have a problem understanding the shape of the used system as i'm using a Model that has a roof of both flat and inclined spaces. i do input the percentage of the roof to be covered by solar panels but does that include both inclined and flat or flat alone. also are the panels fixed with an angle on the roof or it's angle is zero " same as the roof components". can i change it's angle ? also can i still add more pv on the shading system, i found an Energyplus measure that does that Add Simple PV to Specified Shading Surfaces but i can't use both measure same time. please share your thoughts with me on this issue

answered 2017-02-15 09:53:20 -0500

David Goldwasser

20295 ●94 ●14 http://www.openstudio.net/

updated 2017-02-15 09:55:22 -0500

The Add Rooftop PV measure was meant for early design so was pretty simple. It offsets copies of roof surfaces vertically (maintaining their existing angle) and turns them into shading surfaces. If the fraction of surface used as PV is less than 1, then a shading schedule is added to let the inverse fraction of light through. So if PV fraction is .8 then .2 of the light will come through the shading surface.

You should be able to run Add Rooftop PV and Add Simple PV measures, but keep in mind the Add Simple PV measures pre-dates OpenStudio PV support so it is an EnergyPlus measure. You can now also add PV to building and shading surfaces directly in the SketchUp plugin as shown in this post.

It would be nice to eventually update the rooftop PV measure, or have a new one, to automatically create rows of tilted PV strips vs. a flat PV, but just wasn't needed or budgeted for in our first pass.

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I should point out the measure isn't currently smart enough to look for skylights in roofs, so they would be covered up by the PV, with only a fraction of light coming through.

David Goldwasser ( 2017-02-15 09:56:41 -0500 )edit

thanks, now i understand how it works..i hope that update can happen soon so i can change the PV angle or make it automatically movable to get as much solar radiation as it can.