Flawed energy efficiency modeling is the reason many green buildings fail to live up to expectations on energy efficiency, according to a U.K. researcher.
David Coley, a University of Bath specialist, led a team that surveyed 108 architects, engineers, and energy consultants who routinely use energy performance models. They asked participants to look at a typical British semi-detached home recently updated to meet current building codes. Then they asked test subjects to rank which improvements made the most difference to energy performance.
Their answers didn’t match up with reality, suggesting a performance gap between modeling and the real world. There were cases where the modelers produced a savings measure that was more than the energy use of the house.
Energy models showing unreasonable results are evident at the preliminary stage on half of projects going through the LEED certification process, according to a U.S. Green Building Council official. Designers have a tendency to accept outputs without evaluating the reasonability of the results, she said.
Part of the reason for the performance gap is that modelers do not usually go onsite to see how the building operates and compare that to the design. Typically there is no expectation that they’ll even talk to the building manager at year one and ask how energy usage compares with the original model.
Related Stories
| Nov 27, 2013
ASTM issues revised standard on phase I environmental site assessments
ASTM has issued revised standard ASTM E1527-13 that governs phase I environmental site assessments.
| Nov 27, 2013
Vancouver, B.C., bans doorknobs in building code update
The goal of making it easier for people to age in place led to amendments to Vancouver, B.C.’s building code including banning doorknobs in favor of lever handles.
| Nov 22, 2013
Kieran Timberlake, PE International develop BIM tool for green building life cycle assessment
Kieran Timberlake and PE International have developed Tally, an analysis tool to help BIM users keep better score of their projects’ complete environmental footprints.
| Nov 20, 2013
WDMA receives final approval on code amendments
The Window and Door Manufacturers Association (WDMA) was granted final approval of several amendments it proposed to the 2015 editions of the International Residential Code (IRC), International Energy Conservation Code (IECC), and International Existing Building Code (IEBC).
| Nov 20, 2013
Safe Jobs Act would provide more protection for New York City construction workers
Legislation that would require safety training for construction workers on public projects in New York City has been introduced to the City Council.
| Nov 20, 2013
Boston officials grapple with impact of new FEMA flood maps
New federal maps for Boston significantly expand the number of homes and businesses in areas considered at high risk of flooding, a change that could force thousands of property owners to purchase expensive insurance and complicate redevelopment along the city’s waterfront.
| Nov 20, 2013
How LEED and Green Globes stack up
An analysis of the strengths and weaknesses of the Green Globes rating system and LEED standards puts LEED ahead, but doesn’t discount the merits of Green Globes.
| Nov 14, 2013
First LEED v4 certified project garnered by Beijing furniture showroom
Haworth’s showroom in Beijing’s Parkview Green building has been recognized as the world’s first certified LEED project under the USGBC’s new LEED version 4 beta program.
| Nov 14, 2013
OSHA proposes requirement for large firms to disclose workplace injuries
A proposal from the Occupational Safety and Health Administration would require companies with more than 250 employees to disclose workplace injury and illness reports online.
| Nov 14, 2013
GSA asks for input to help study energy-efficient technologies on its buildings
The General Services Administration has posted a request online, asking those in industry, academia and nonprofits for information on green building technologies.
