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
Codes and Standards | Jan 17, 2018
Green Building Initiative acquires global rights to Green Globes from JLL
Transaction allows GBI to expand operations to Canada and elsewhere.
Codes and Standards | Jan 16, 2018
Engage code officials early for better building performance, predictable enforcement expectations
White paper says code officials should be collaborators and facilitators.
Codes and Standards | Jan 12, 2018
Arlington County, Va., earns first LEED for Communities Platinum Certification
Honor recognizes efforts to reduce greenhouse gas emissions, manage stormwater.
Codes and Standards | Jan 11, 2018
TRUE Zero Waste provides roadmap to divert waste away from landfills
USGBC program signs on more than 130 companies or facilities for certification.
Codes and Standards | Jan 10, 2018
Sliding-scale proposal for civil damages resulting from construction fatalities, injuries draws ire of trades
New York City Council proposal puts limits on penalties for safety violations leading to death, serious injury.
Codes and Standards | Jan 9, 2018
Federal appeals court orders EPA to revise lead standard within a year
Current exposure levels for lead in paint and dust have been in place for 17 years.
Codes and Standards | Jan 5, 2018
Building code officials should vet building product evaluation methods
Evaluation service providers should be properly accredited.
Codes and Standards | Jan 4, 2018
U.S. military needs to do more to address climate change risk for facility design
GAO report cites hundreds of overseas facilities in peril.
Codes and Standards | Jan 3, 2018
China Construction America faces billions of dollars in liability in lawsuit
Court filing alleges massive fraud and breaches of contract in Baha Mar Resort Project.
Codes and Standards | Jan 2, 2018
Smart building tech can reap utility savings of 8% to 18% in commercial buildings
Potential for increased deployment of smart building technology is great beyond early adopters.