Tools: The Globoscope

Say you want to evaluate a piece of land for its solar potential.  Maybe it's surrounded by buildings or trees.  You can use a device called the Solar Pathfinder (see below).  It essentially reflects the surrounding features to create a map of the sky—a hemispherical projection—corresponding to all the hours of the year.

I believe the Solar Pathfinder is a direct descendant of the Globoscope, an instrument created by Swedish architect Gunnar Pleijel in 1947.  Pleijel described the Globoscope in 1963 as "a paraboloidal mirror with a vertical axis of revolution, which is photographed from above through a lens."  The "little-known device" was resurrected by Penn State researchers in a 1977 paper in Solar Energy.

Pages from The globoscope.jpg

The Big Roof

I'm calling it.  The Big Roof (for PV panels) is officially a style.

Besides being Big, I suppose the salient characteristic of the Big Roof is that it's detached from the main body of the building, as an independent form.

Additionally, Bohlin Cywinski Jackson has a number of "Big Roof" projects, such as the Frick Environmental Center (below), similar in essence but PV panels are not part of the roof design.



I have little original to add here, but I wanted to call your attention to the article "Is Ornamenting Solar Panels a Crime?" by Elvia Wilk, which describes the Solarpunk movement, because it's wonderful and you should read it.

What is Solarpunk?  It's derived from Steampunk and Cyberpunk, but oriented to clean energy.  Wilk, in the link above, explains the Solarpunk philosophy: 

"In its willful naiveté, this ornamented vision is inflected with nostalgia for an imaginary, bygone time when tech was tinkerable and free from mass production and standardization." 

In its imagery, the Solarpunk movement includes a strong Art Nouveau influence, which to me feels right, right now.  (See also: Art Nouveau and Modernisme)

 Solarpunk art by Luc Schuiten ( link )

Solarpunk art by Luc Schuiten (link)

Additionally, last month Rhys Williams emphasized the literary side of the movement in "Solarpunk: Against a Shitty Future," for the Los Angeles Review of Books.  He wrote:

"Why is this genre promising?  Because in Solarpunk, energy is explicitly political....
Solar energy provides a fruitful and flexible ground in the imaginary for experiments in being human and being social while it also preserves the ecological boundary conditions of our own existence.  And that is the root of Solarpunk: an energy culture that serves as a platform for experiments in being, rather than a closure of it."

I would add: there are wonderful affinities between today's Solarpunks and the future-thinking tinkerers of the 1960s like Peter van Dresser, who are called "Creative Activists" and featured in Chapter 10 of The Solar House.  van Dresser (who wrote some science fiction) called for "a decentralized, biotechnic society" which would represent "revulsion against the Establishment" (link).  Here's how van Dresser described himself on the back cover of his book A Landscape for Humans (1976):

van dresser.jpg

Hey Solarpunks: there's more!  I think you'd like The Solar House.

Wyoming's 100 Classic Buildings

 George Ferris Mansion, Rawlins, Wyoming, by Barber and Kluttz (1903). Photo © Anthony Denzer.

George Ferris Mansion, Rawlins, Wyoming, by Barber and Kluttz (1903). Photo © Anthony Denzer.

Archipedia is a project of the Society of Architectural Historians, my professional society.  It's an online catalog of historic buildings, created with the help of a wide variety of people solicited to write about the selected structures and sites.

Archipedia's distributed team has identified the 100 most important buildings/sites from each state.  For Wyoming, my friend Mary Humstone led the effort and selected the top 100, with input from many others including me.  Thank you to Mary for all her hard work and intelligence.  You can find the list of 100 here

These are Wyoming's 5 best in my opinion:
1. Old Faithful Inn by Robert Reamer (1904) link
2. Cheyenne Union Pacific Depot by Henry van Brunt (1887) link
3. Ames Monument by H.H. Richardson (1882) link
4. Ivinson Mansion By Walter Ware (1892) link
5. Laurance S. Rockefeller Preserve Center by Carney Logan Burke Architects (2008) link

I wrote two entries for Wyoming:
Centennial Complex by Antoine Predock (1993)
Bighorn Canyon Visitor Center by Wirth Design Associates (1976)

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Also on the blog:
Hoyt Hall, University of Wyoming
Solar Principles and Laramie's Hitchcock House

LEED and Energy Use

LEED plaque.jpg

Do you remember, a number of years ago, the tempest about LEED and energy use?  LEED is a voluntary rating system, like a scorecard, where points are earned for different sustainability characteristics.  It's serious, in the sense that it requires tons of documentation by the design team.  It's criticized for a variety of reasons, especially because the points are mostly earned cafeteria-style, meaning the project team can pick-and-choose which sustainability measures to prioritize or ignore.

In 2009, Henry Gifford, a mechanical systems designer, brought a lawsuit against the US Green Building Council, contending that LEED-certified buildings were advertised as energy-efficient but in reality were not.  He lost the suit, however the episode established a perception that it's common for LEED-certified buildings to be energy hogs.  Lloyd Alter coined the phrase LEEDwashing.  (He also defended LEED and called Gifford "nuts.")  In Fine Homebuilding, Kevin Ireton asked "Is LEED a Fraud?"  Fast Company joined the chorus.

So, nine years later, does LEED deliver energy-efficient buildings?  Here's some new information, from an article in the journal BuildingsThe article is called "Assessment of Energy Credits in LEED-Certified Buildings Based on Certification Levels and Project Ownership," by Asli Pelin Gurgun and David Arditi.  Buildings has an exceptionally rigorous review process.

Gurgun and Arditi analyzed the credits earned by 1500 US buildings which achieved Silver-or-above under LEED-NC 2009. 

Most pertinent is LEED credit EA1: "Optimizing Energy Performance."  Projects could earn a maximum of 19 points.  In essence, the project earns a point for being 12% more energy-efficient than code, plus another point for each additional 2% increment.  For the 1500 projects in Gurgun and Arditi's data set:
     ● The projects in aggregate earned 54% of the points in this category
          ● Platinum projects earned 94%
          ● Gold projects earned 62%
          ● Silver projects earned 41%
     ● The average was 10.2 points earned, which corresponds to 30% energy savings
     ● 15 projects, out of 1500, earned 0 points

The authors conclude that energy efficiency points are well-used because typical strategies "are not difficult to implement" and because cost savings "is one of the primary drivers" for owners.

My quick reaction?  Not bad!  For Platinum buildings in particular, you can rest easy that energy efficiency has been prioritized in the design process.

Now, critics of LEED will surely point out a couple of things.  First, this study did not include buildings which achieved the lowest level of certification (LEED-Certified), so some of those buildings are likely to be average performers in energy use.  Second, this paper only examines credits achieved, and these are achieved by energy modeling, not actual energy performance.  As I've discussed before, User Behavior can profoundly affect the results.

In that vein, it's also worth looking at LEED credit EA5: "Measurement and Verification," which asked buildings to install metering equipment, measure energy use, and compare against the predicted values.  3 points could be earned.  For credit EA5, Gurgun and Arditi found:
     ● All projects in aggregate earned 34% of the points
          ● Platinum projects earned 66%
          ● Gold projects earned 36%
          ● Silver projects earned 28%
     ● More than half of projects (830 out of 1500) earned 0 points
(In LEED v4 this is revised and called "Advanced Energy Metering.")

My quick reaction?  Not good!  The authors speculate that these credits are avoided because they are costly.

So—again—does LEED deliver energy-efficient buildings?  Unfortunately the answer remains inconclusive.

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A final note: While most LEED critics argue that the rating system is not rigorous and susceptible to 'washing', in my 2011 article "The Limitations of LEED: A Case Study" (with Keith Hedges), I concluded that some early LEED projects were likely to be underscored, because the documentation process was opaque, difficult, and often assigned to an intern.