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 | Feb 18, 2020
Recent Dept. of Energy grants emphasize grid-interactive building technology
National labs, universities, businesses selected for total of $74 million in funding.
Codes and Standards | Feb 14, 2020
At least 13 states create incentives for utilities to use demand response programs
Practice optimizes power grid, incorporates more renewable power.
Codes and Standards | Feb 13, 2020
Living Future Institute’s JUST program helps measure progress on sustainability, social justice
Functions as a transparency platform for organizations to disclose their operations.
Codes and Standards | Feb 12, 2020
Commercial Building Energy Saver Wins R&D 100 Award
Software toolkit enables access to deep energy retrofit and zero-net energy strategies.
Codes and Standards | Feb 11, 2020
Fenestration Rating Council launches faster energy performance testing system
New windows, doors, and skylights will get to market faster.
Codes and Standards | Feb 7, 2020
Landlords scramble to comply with the New York City Council’s Climate Mobilization Act (CMA)
Intent is to reduce greenhouse gas emissions; improve efficiency for buildings larger than 25,000 sf.
Codes and Standards | Feb 6, 2020
New document to determine THERM finite element modeling surface temperatures released
Process often used to predict interior surface temperatures on fenestration.
Codes and Standards | Feb 5, 2020
HUD issues guidance on emotional support animals
Clarifies the responsibilities of rental housing providers and renters.
Codes and Standards | Feb 4, 2020
New Jersey to become first state to require building contractors to consider climate change impact
Governor has seven key strategies for emissions cuts.
Codes and Standards | Jan 31, 2020
Colorado ranks first in LEED Top 10 states
Rankings of states for LEED certified square feet per person released.