PV(photovoltaics) elements actually become an integral part of the building, by having dual functions. Not only to serve as the building envelope material, actually the PV roof system also serves as a power generator. Having the PV oriented to Southern exposure, to maximize the solar gain, while having glazing to the Northern exposure to achieve natural lighting into the buildingThe power that are generated by the PV can obtain proximately from 3-5 kilowatts per square meter of solar energy.
On a replacement basis, PV power is cheap. It takes about twenty years to replace the entire array. Such a program would guarantee level electrical output forever. And what would the cost be in this scenario? Only 5% of installation costs, or less than one cent per kWh! That is why PV electricity is a compelling long-term investment and energy efficiency.
3 comments:
Felix, nice job, I need more of these details. The collectors are placed on a shallow roof. This means your panels produce the most electricity in the summer. Is this your intent? The clerestory window facing north are lighting a narrow circulation space, that a) doesn’t require high amounts of light and b) can be easily lit by windows facing north (just like the second floor!). The top two floors house the same program. If you claim benefits from the clerestory under the PV panel roof, how can you spread that benefit to both floors?, and maybe even down to the ground floor, where you received big question marks in your review?
The 1 12/” insulation is very skimpy for a project that wants to be green.
Felix:
Your wall section are very clear and illustrative.I like the way you have presented the drawings in an isometric view to help guide the contractor and non technical people about the way it goes together.
Werner,
That is my intent, to have the solar placed on the angle, while the collectors, and other roof penetration and equipment on the shallower roof. I spoke with Chris, the collectors does not required lots of spaces, so it's enough for me to put other roof equipments.
the benefit of the clerestory window, mostly benefitted for the 3rd floor and the west side of the bar/smallest bar where there are programs for exhibition spaces on 1st floor, gathering space located on the 2nd floor.
My initial thought having 1-1/2 insulation is to keep the roof as light as possible, and gaining good R value, since the construction consisting of 2 different roof layers and membranes, plus PV systems on top of the roof system. I thought this roof system will be sufficient enough to protect and gaining best value for the building costs.
I'm sure it is not a problem to add more insulation, but I thought it just as important to explain my design process.
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