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 | Mar 25, 2016
ASHRAE grants fund human thermal comfort database project
Aim is to help better understand thermal comfort in residential and commercial buildings.
Codes and Standards | Mar 25, 2016
OSHA finalizes new silica dust regulations
Construction industry has until June 2017 to comply.
Wood | Mar 23, 2016
APA updates Engineered Wood Construction Guide
Provides recommendations on engineered wood construction systems.
Codes and Standards | Mar 23, 2016
Affordable housing advocates differ on micro-apartment policy
New York’s luxury micro units could be first step to developing affordable units.
Codes and Standards | Mar 21, 2016
GRESB launches Health and Well-being Module for real estate industry
Optional supplement to environmental, social, and governance assessment.
Codes and Standards | Mar 4, 2016
U.S. Supreme Court lets San Jose affordable housing law stand
Law attempts to alleviate Silicon Valley’s high housing costs.
Codes and Standards | Mar 2, 2016
WELL standard offers multiple benefits for owners, says real estate executive
Could be a recruiting tool for occupant companies.
Cultural Facilities | Mar 1, 2016
China bans ‘weird’ public architecture, gated communities
Directs designers of public buildings to focus on functionality.
Energy Efficiency | Feb 23, 2016
Economists, energy efficiency practitioners need to work together for better cost/benefit studies
Flawed energy efficiency research yields misleading, confusing results.
Codes and Standards | Feb 16, 2016
New York City implements new crane safety plan following deadly accident
The plan includes restrictions on crawler cranes during windy conditions.