Solar Form: Self-Shading

Solar architecture takes many forms.  A common form for solar houses, especially prevalent in the 1970s and 80s, included a south-facing sloped glass wall, to collect solar heat.  I trace the history of this type in The Solar House.  In the book I also discuss some ideas about solar aesthetics from that period.

Here's more evidence (not in the book) that solar architecture matured in the 1970s.  Where the opposite environmental need predominated---cooling rather than heating---the inverse formal strategy took hold.  I've collected some examples, where the architectural form is clearly meant to provide self-shading so heat gain would be minimized. 

Note that the self-shading form may be oriented to the south or to the west, depending on the site conditions and the needs of the building.

Tempe City Hall
Michael & Kemper Goodwin (Tempe, 1971)

https://www.flickr.com/photos/79682775@N02/7165658438/

https://www.flickr.com/photos/79682775@N02/7165658438/


Blue Cross and Blue Shield headquarters
Odell Associates (Chapel Hill, 1973)

https://carrboroman.files.wordpress.com/2012/01/hq.jpg

https://carrboroman.files.wordpress.com/2012/01/hq.jpg


National Housing Center
Vincent Kling (Washington, DC, 1974)

http://i.ebayimg.com/images/g/ThkAAOSwFdtX0BGW/s-l1600.jpg

http://i.ebayimg.com/images/g/ThkAAOSwFdtX0BGW/s-l1600.jpg

In a 1963 talk called "Solar Effects on Architecture," Vincent Kling said:
"it is obvious that the esthetics of any building design come as much from a mature, realistic approach to the sun effect as from almost any other single force affecting design concepts. As the architect solves the problem of sun effect, he is putting his stamp and flavor on the architecture."


Hartford Building
Ellerbe & Company (Woodbury, MN, 1977)

http://x.lnimg.com/photo/poster_1920/fafd1184e1a64df18ba3a17047904bd9.jpg

http://x.lnimg.com/photo/poster_1920/fafd1184e1a64df18ba3a17047904bd9.jpg


Dallas City Hall
I.M. Pei (Dallas, 1978)

https://commons.wikimedia.org

https://commons.wikimedia.org

These are but a few.  Do you know of other examples?  Please include them in the comments!

House of Tomorrow: Restoration Team

George Fred Keck's House of Tomorrow, built for the 1933 Century of Progress International Exposition in Chicago, will soon be restored.  The structure, which now resides in northern Indiana, has been in shambles for years.  It's a major building in the history of passive solar heating, as I explain in The Solar House.

Yesterday, the restoration team was formally announced by Indiana Landmarks.  Here is the full press release.


For immediate release
March 15, 2017

House of Tomorrow restoration team announced

CHICAGO – At a monthly talk sponsored by AIA Chicago’s Historic Resources Committee, Indiana Landmarks and the National Trust for Historic Preservation announced the team that will lead the rehabilitation of The House of Tomorrow. Designed by Chicago architect George Fred Keck for the 1933-34 Chicago Century of Progress World’s Fair, the building sits in a dilapidated state atop a sand dune in Northwest Indiana.

Todd Zeiger, director of Indiana Landmarks’ northern office in South Bend and House of Tomorrow project manager, introduced the team after the talk on Tuesday, March 14. Jennifer Sandy, senior field officer of the National Trust, also spoke at the AIA session. Last fall, the National Trust named the site a National Treasure and with Indiana Landmarks launched a $2.5 million campaign to restore the house.

The design team working to rehabilitate America’s first glass house includes the following Chicago-based firms.

bKL Architecture taking the lead in architecture and interior design with a team led by Charles R. Hasbrouck, FAIA; Bauer Latoza Studio, led by Edward Torrez RA, AIA, LEED AP BD+C, providing historic preservation consulting services; Wiss, Janney, Elstner Associates, Inc., providing structural engineering services with a team led by Senior Associate Michael Ford; Willoughby Engineering, led by Thomas Willoughby, supplying mechanical, electrical and plumbing engineering services; HJKessler Associates, led by Helen Kessler, FAIA, LEED, providing sustainability consulting services.

Staff from the National Park Service and State Historic Preservation Office will ensure the project meets preservation standards.

In the midst of the Great Depression, the House of Tomorrow offered 39 million World’s Fair visitors an optimistic look into the future of residential architecture and modern technology, with a focus on how advancements in science and technology could improve daily life. Indiana Landmarks, a nonprofit preservation organization headquartered in Indianapolis, aims to restore the House of Tomorrow while sharing Keck’s goal of making it a visionary dwelling, this time for the twenty-first century.

In his design for the House of Tomorrow, Keck underscored the fair’s theme by showing people a new way to live in what the media called “America’s First Glass House.”  The glass curtain-wall structure predates Mies van der Rohe’s 1951 Farnsworth House in Illinois and Philip Johnson’s 1949 Glass House in Connecticut.

The large expanses of glass introduced the concept of passive solar energy as a sustainable heating technique for the first time. Four years later, Keck developed Thermopane glass with the Libbey-Owens-Ford company. In his long career—he died in 1980—he designed 300 passive solar houses, most in the Chicago area.

Keck also introduced new inventions and modern conveniences in the House of Tomorrow, including an “iceless” refrigerator, the first-ever General Electric dishwasher, and an open floor plan—an innovation in 1933.

To create the twelve glass sides, Keck designed a central hub of posts connected to girders that radiated like the spokes of a wheel. A central steel core contained mechanical equipment. The cantilevered girders provide support for the concrete-slab second and third floors, along with slender steel columns, allowing clear spans for open interior spaces. The rehabilitation will peel away deteriorated surfaces to reveal the original wheel-and-spoke steel structure, and restore the house using smart glass and other cutting-edge technologies and products.

When the World’s Fair closed in 1934, Chicago developer Robert Bartlett used barges and trucks to ship the House of Tomorrow and other Century of Progress structures to Beverly Shores, an Indiana town he was attempting to develop as a vacation destination for Chicagoans. Five Century of Progress houses were sold and remained in private hands until the land became part of the Indiana Dunes National Lakeshore between 1966 and the early 1970s.

All five were listed in the National Register of Historic Places in the 1980s, but by the mid-1990s the homes were in alarmingly poor condition. Since there was no public money to restore the houses, Indiana Landmarks proposed a solution that hadn’t been previously considered:  long-term leases.

Indiana Landmarks leased the Century of Progress houses from the National Park Service, and over the last 15 years has subleased four of the five to individuals who restored them in exchange for a long-term residency. The restoration cost for each house—borne solely by the sub-lessees—reached over a million dollars. The House of Tomorrow, however, posed unusual challenges and led Indiana Landmarks to tackle the rehabilitation itself.

“With help from the National Trust, we’ve put together a stellar team of Chicago architects, engineers, and preservation and sustainability experts, all of whom are enthusiastic to work on restoring this important Chicago landmark that happens to live in Indiana,” says Todd Zeiger.
To contribute to the restoration of the House of Tomorrow, a rare World’s Fair survivor that will burnish George Fred Keck’s legacy, visit https://www.indianalandmarks.org/about/special-projects/house-of-tomorrow/.

###

About Indiana Landmarks
Indiana Landmarks revitalizes communities, reconnects us to heritage, and saves meaningful places. With nine offices located throughout the state, Indiana Landmarks helps people rescue endangered landmarks and restore historic neighborhoods and downtowns. People who join Indiana Landmarks receive its bimonthly magazine, Indiana Preservation. For information on membership in the nonprofit organization, call 317-639-4534, 800-450-4534, or visit www.indianalandmarks.org.

About The National Trust for Historic Preservation The National Trust for Historic Preservation, a privately funded nonprofit organization, works to save America’s historic places. www.savingplaces.org

About National Treasures
The National Trust for Historic Preservation mobilizes its more than 60 years of expertise and resources to protect a growing portfolio of National Treasures that are threatened buildings; neighborhoods, communities, and landscapes that stand at risk across the country. Our National Treasures program demonstrates the value of preservation by taking direct action to protect these places and promote their history and significance.

About Indiana Dunes National Lakeshore
Indiana Dunes National Lakeshore is one of 413 units of the National Park System ranging from Yellowstone to the Statue of Liberty. Indiana Dunes National Lakeshore includes 15 miles of the southern shoreline of Lake Michigan and 15,000 acres of beach, woods, marshes, and prairie in the northwest corner of Indiana. For more information go to: www.nps.gov/indu

JTPR, Indiana Landmarks 1201 Central Ave., Indianapolis, 46202 Indiana, United States
K-4-1517289-6939510-2-69-AV1-6ABC5C9F


Unearthed: George Fred Keck interview

Here's a major new discovery.  Jim Laukes, an independent scholar in Chicago (and good friend), has acquired and digitized a filmed interview of George Fred Keck, from the mid-1970s.  He has posted these to Vimeo.  Links below.

Part 1 of 6 (27:00)
Part 2 of 6 (27:01)
Part 3 of 6 (coming soon)
Part 4 of 6 (27:00)
Part 5 of 6 (27:01)
Part 6 of 6 (coming soon)

As I've mentioned before, there has been very little scholarship about Keck relative to his importance.  So this is quite important for architectural history.

Jim promises there are other interviews to come.  He blogs here.


Solar Air Heating

A new experiment in New Zealand, linked below.

A new experiment in New Zealand, linked below.

Solar Air Heating isn't sexy, but it can be effective if controlled properly.  'Solar Air Heating' refers to active systems which heat air directly, with collectors, fans, and ducts---not passive solar heating.  My book The Solar House documents and discusses the history of this technology, beginning in the 1940s.  George Löf was the most important figure in this technology, and his work is featured extensively in the book.

An advantage of Solar Air Heating is that the heat is collected outside the building, so it can be rejected when it isn't wanted, thereby reducing the risk of overheating the indoor spaces.  The main problem with Solar Air Heating is storage.  Solar heat is plentiful in the afternoon.  You need it in the middle of the night.  Storing heat in gravel beds and tubes became popular in the 1970s.  I know of some 1970s-80s buildings where the rooftop collectors have been removed, but the basement remains full of gravel.

Today, it's my impression that flat-plate collectors (with glass), and gravel beds, are so uncommon as to be practically obsolete.  The most common form of Solar Air Heating, I think, is the transpired solar wall. (SolarWall seems to be the biggest manufacturer.)

So I was surprised to learn about a new project in New Zealand (pictured above) using flat-plate collectors to heat air directly.  The collectors, manufactured in Denmark, include PV cells to drive the fans, so no electricity is drawn from the grid.  Pretty clever!  More information about this project is available here.

Thermal Noon

Here's a new concept: "Thermal Noon."  I think it might be a valuable way to help people understand building performance. 

It's similar to the phenomenon, which I think ordinary people understand, that the Summer Solstice is not the hottest day of the year.

For any building, the balance between gains & losses are strongest at Solar Noon, all else being equal.  If the building were perfectly responsive, it should be hottest at Solar Noon each day.  But because of insulation and thermal mass lag time (plus internal gains and static shading), a typical building is hottest at 4:00 or 5:00.  In a lossy house it's earlier, and in a Passivhaus it might occur when cooking dinner.  That time could be called Thermal Noon.  And it changes day by day.  In heating season, you'd like thermal noon to occur as late as possible, to offset lower outdoor temperatures.

By modeling gains & losses we can compute this time for a given building on a given day.  Architectural engineers effectively do this when determining peak loads.  It can be pulled out of simulation data, or in a finished building it can be measured empirically.

The other critical value, besides the time, is the high temperature.  And higher isn't necessarily better.  We're getting much more attuned to the problem of overheating.  In a workspace, you probably can't tolerate it reaching 80°F in the afternoon.  The ventilation will kick in and defeat the energy savings you want.  In a house you probably can tolerate 80°F but maybe not much more. 

Do you think Thermal Noon, and the difference between Solar Noon and Thermal Noon, are valuable things to know for a building?  Please comment!