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View Diary: Ikea produces enough clean energy to match a third of its global energy use (56 comments)

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  •  I think doing an array over the parking lot is a (5+ / 0-)
    Recommended by:
    caryltoo, quill, Lujane, denig, glitterscale

    better option since most roofs can be white thus lowering the heat island effect.

    The blacktop paving in the parking lot is a bigger problem and covering it will help cool the whole area around the big box.

    •  No reason stores can't do both. (5+ / 0-)
      I think doing an array over the parking lot is a bdtter option....
      But it's easier to start with the roof because the store doesn't need to install a new structure.  Putting solar panels over the parking lot would require the expense of a structure to support them.  

      "My country, right or wrong; if right, to be kept right; and if wrong, to be set right." -- Sen Carl Schurz 1872

      by Calamity Jean on Wed Nov 20, 2013 at 09:47:08 AM PST

      [ Parent ]

    •  I think the expense... (4+ / 0-)
      Recommended by:
      VL Baker, Yoshimi, Sylv, julesrules39

      ...of putting an array over the parking lot would be much more prohibitive than just on the rooftop, since most stores' parking lots don't have roof structures—meaning they'd have to build the structure (another thing to build/maintain) and then put the solar panels on top of it.

      However, there aren't many stores that don't already have a roof that can withstand the weight of solar panels, given that most have those giant A/C units up there.

      "When I give food to the poor, they call me a saint. When I ask why the poor have no food, they call me a communist." --Dom Helder Camara, archbishop of Recife

      by JamesGG on Wed Nov 20, 2013 at 11:25:00 AM PST

      [ Parent ]

      •  Typically the structure is bigger under the AHU bu (0+ / 0-)

        the rest of the roof is long span truss to avoid filling the store with columns.

        I'd say increasing the structure on the building vs building a light structure over the parking lot might be a wash.

        •  it is a wash. (0+ / 0-)

          roof is more secure, but has lots of things sticking up,
          has a hard time getting material up there and requires
          lots of careful engineering.

          down on the parking lot, you need to secure things
          and you need to dig it all in

          •  It also means giving up some parking spaces (1+ / 0-)
            Recommended by:

            for the support columns, and having to run a lot more wiring.

            Black roofs in Buffalo in January save a ton of heating expenses.  In Phoenix, they'll kill you on cooling in August.

            Additionally, parking lots can be paved with a wide variety of "cool pavements".

            It's probably a different answer at each site.

            "I read New republic and Nation/I've learned to take every view.." P. Ochs

            by JesseCW on Sat Nov 23, 2013 at 04:20:48 AM PST

            [ Parent ]

            •  to a first order the correct answer is more. (0+ / 0-)

              more solar PV, more passive design, more insulation,

              but, yeah, in extreme climates the details will vary.

              The cool thing is 2014 predicts to install 50 GW of solar.

              50 Freaking GW.

              that's 10X the number of nuclear plants going in

              if we keep up this growth rate in a few years,
              solar will bypass nuclear power production entirely.

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