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 | Sep 7, 2021
Boston turns to developer fees to fund flood protection infrastructure
Assessments on commercial properties will help build seawall and other protective measures.
Codes and Standards | Sep 3, 2021
Low-cost methods can have substantial impact on reducing embodied carbon
Whole-building design, material substitution, and specification strategies can slash carbon by up to 46%.
Codes and Standards | Sep 2, 2021
Case for power resiliency in buildings grows with more disaster and outages
Essential businesses like data centers, hospitals are first adopters of new storage systems.
Codes and Standards | Aug 31, 2021
UK industry group wants mandatory whole-life carbon assessments of buildings
Aims to address hidden emissions embedded in supply chains.
Codes and Standards | Aug 31, 2021
Home electrification will require code upgrades
Residential electric panel capacity must be increased.
Codes and Standards | Aug 30, 2021
Facebook’s new $800 million Arizona data center to save big on water
Will restore more than 200 million gallons of water per year to river basins.
Codes and Standards | Aug 26, 2021
California may require solar on new high-rise residential and commercial buildings
State energy commission approves proposal; Could become law in 2023.
Codes and Standards | Aug 25, 2021
Study finds racism, discrimination common in construction industry
NIBS to share best practices with industry leaders to improve worker treatment.
Codes and Standards | Aug 24, 2021
White paper addresses insulated metal panel specifications for roofs and walls
Pertains to provisions of the National Building Code of Canada.
Codes and Standards | Aug 24, 2021
KTGY releases free resource to reduce carbon footprint in multifamily developments
Helps navigate Denver Green Code measures—a series of voluntary codes.