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 | Jul 8, 2020
Standards for reducing risk of COVID-19 in senior living communities
AIA releases strategies and illustrations for the sector.
Codes and Standards | Jul 6, 2020
Guide presents benefits of public-private partnerships
Discusses process from project conception to construction.
Codes and Standards | Jul 1, 2020
COVID-19 public health guidelines may be downplaying building systems solutions
Emphasis on cleaning surfaces overlooks importance of mechanical infrastructure.
Codes and Standards | Jun 30, 2020
WELL building institute steps up health safety rating for hotels and resorts
Certification body forms advisory group of industry leaders and health experts.
Codes and Standards | Jun 30, 2020
7 must reads for the AEC industry today: June 30, 2020
Affordable housing comes to the Bay Area and this is not the end of cities.
Codes and Standards | Jun 29, 2020
Mandated building retrofits are necessary to meet climate crisis
Performance standards could greatly reduce GHG emissions.
Codes and Standards | Jun 29, 2020
New buildings can fall short of designed performance
Similar structures can produce different energy usage results.
Codes and Standards | Jun 25, 2020
Arc offers tools, analytics for safe workplace re-entry
Platform helps sustainability teams to collect data, benchmark progress, measure impact, and improve performance.
Codes and Standards | Jun 24, 2020
New API enables design and construction technology platforms to connect
Construction Specifications Institute offers “digital classification engine.”
Codes and Standards | Jun 23, 2020
State lawmakers encouraging transition to heat pumps for building heating
Policies aim to replace gas heaters with electric units.