The newly revised ANSI/ASHRAE Standard 105-2014, Standard Methods of Determining, Expressing, and Comparing Building Energy Performance and Greenhouse Gas Emissions, is intended to provide consistency in reporting the energy performance of existing or proposed buildings.
The standard answers such questions as: Should the measurements of a building’s area used in the equation to derive energy use per square foot be taken from the exterior dimensions or to the centerline of the wall? And, should storage spaces be included even though they are unoccupied?
“A standard method of measurement is needed to compare one building’s energy use to another,” says Keith Emerson chair of the Standard 105 committee. “For instance, comparing one building’s summer energy use to another building's winter use would be comparing apples and oranges.”
The standard provides a common basis for reporting building energy use in delivered energy forms and expressions of energy performance, and for comparing energy performance in terms of energy resources used and greenhouse gas emissions created—both across buildings and for energy efficiency measures within buildings. It also provides guidelines for comparing design options.
“To keep the standard flexible, a number of decisions are left to those who adopt it, including what should be calculated beyond site energy and the multipliers for those additional calculations,” Emerson said.
Related Stories
Codes and Standards | Oct 11, 2018
On-site staff key to energy benchmarking project for property management company
Manager training, data sharing are critical to meeting 20% utility cost reduction goal.
Codes and Standards | Oct 10, 2018
Interactive heat maps track temperature ranges in U.S. cities
Urban heat island effect can vary by as much as 37°F in the same city.
Codes and Standards | Oct 9, 2018
Power systems will become more decentralized for better disaster resiliency
Businesses, homeowners will control more power-generation capacity.
Codes and Standards | Oct 5, 2018
Getting commitments from key subs critical on government contracts
Withdrawn subcontractor bids can be costly.
Codes and Standards | Oct 4, 2018
Internal watchdog says EPA falling short to protect school children from asbestos
Agency not conducting enough inspections, report says.
Codes and Standards | Oct 3, 2018
Climate change impacts could prompt realignment of assets for commercial property developers
Strategies include reducing exposure to properties in flood-prone areas.
Codes and Standards | Oct 2, 2018
Political will, tougher standards needed to reach carbon neutral goal
Stretch codes, more stringent credentials for designers, contractors, and inspectors may be needed.
Codes and Standards | Sep 27, 2018
Natural light is the most prized office perk
Employees crave sunshine and views of the outdoors more than cafeterias, fitness centers, and childcare.
Codes and Standards | Sep 26, 2018
Industry consensus needed for multifamily energy efficiency retrofit approach
Choice of insulating materials can impact indoor air quality, resident health.
Codes and Standards | Sep 25, 2018
New market forces disrupting global real estate development industry
Executives concerned about trade policy, labor shortages, approval processes.