While suspended, lay-in ceilings have long been the norm in commercial design, the open-plenum ceiling has become trendy and economical, particularly in office and retail environments. However, calculating the tradeoffs between cost and performance can be tricky.
Very little data exists comparing suspended ceilings with open ceilings on the basis of cost and performance. The most recent study came from the Ceilings & Interior Systems Construction Association (www.cisca.org) five years ago. In the study, office and retail spaces were modeled in Chicago, Charlotte, Oklahoma City, Orlando, and Phoenix to reflect the differences in energy costs, climate, and installation costs. Initial construction costs were determined using RSMeans data; annual operating costs for HVAC, lighting, and maintenance were calculated according to Building Owners and Managers Association data.
The study found initial construction costs for suspended ceilings to be 15-22% higher in offices, and 4-11% higher in retail spaces. However, total energy savings for lay-in ceilings vs. open plenums were 9-10.3% in offices and 12.7-17% for retail. A 10.5% energy reduction qualifies buildings for a LEED EA credit, and a 14% reduction is good for two points.
The study attributed the energy performance advantage of suspended ceilings to the use of a return air plenum with low static pressures and fan horsepower vs. ducted air returns with higher static pressures and fan horsepower in open-plenum systems. In addition, return air plenums more efficiently remove heat from lighting systems and reduce the AC load. Suspended ceilings also offer about 20% higher light reflectance, thereby reducing lighting costs.
For more information, see: http://www.cisca.org/files/public/LCS_brochure_rev_9-08_lo-res.pdf.
Related Stories
| May 31, 2013
Nation's first retrofitted zero-energy building opens in California
The new training facility for IBEW/NECA is the first commercial building retrofit designed to meet the U.S. Department of Energy’s requirements for a net-zero energy building.
| May 30, 2013
The Make It Right squabble: ‘How many trees did you plant today?’
A debate has been raging in the blogosphere over the last few months about an article in The New Republic, “If You Build It, They Might Not Come,” in which staff writer Lydia DePillis took Brad Pitt’s Make It Right Foundation to task for botching its effort to revitalize the Lower Ninth Ward of New Orleans.
| May 30, 2013
5 tips for running a successful BIM coordination meeting
BIM modeling tools are great, but if you can't run efficient, productive coordination meetings, the Building Team will never realize the benefits of true BIM coordination. Here are some helpful tips for making the most of coordination meetings.
| May 29, 2013
Realtors report positive trends in commercial real estate market
Realtors who practice commercial real estate have reported an increase in annual gross income for the third year in a row, signaling the market is on the road to recovery.
| May 29, 2013
6 award-winning library projects
The Anacostia Neighborhood Library in Washington, D.C., and the renovation of Cass Gilbert’s grand Beaux-Arts library in St. Louis are among six projects to be named 2013 AIA/ALA Library Building Award winners.
| May 28, 2013
LED lighting's risks and rewards
LED lighting technology provides unique advantages, but it’s also important to understand its limitations for optimized application.
| May 28, 2013
Minneapolis transit hub will double as cultural center [slideshow]
The Building Team for the Interchange project in downtown Minneapolis is employing the principles of "open transit" design to create a station that is one part transit, one part cultural icon.
| May 24, 2013
First look: Revised plan for Amazon's Seattle HQ and 'biodome'
NBBJ has released renderings of a revised plan for Amazon's new three-block headquarters in Seattle. The proposal would replace a previously approved six-story office building with a three-unit "biodome."
| May 23, 2013
Supertall 'Sky City' will house 4,400 families in Changsha, China
Broad Sustainable Building has completed a long and arduous approval process, and is starting excavation and construction on Sky City in June, 2013. The proposed "world's tallest building" will be a mixed-use project that could accommodate life and work needs of up to 30,000 people.