white papers

Evaluation of TGSIII for MURBS

Sustainable Buildings Canada undertook to provide an evaluation for multi-unit residential buildings (MURBs) using the new ENERGY STAR for Mid/High Rise Buildings (ESMB) and the Toronto Green Standard Version III (TGSIII), compared to the current Building Code requirements for energy efficiency. Support was provided by Enbridge Gas Distribution and EnergyQuality Corporation. This report presents the results for TGSIII, for which a description of the methodology including the three targets is provided. SBC provided design specifications for three recently designed MURBs that met the current Building Code, a 6 storey low-rise, a 10 storey mid-rise, and a 20 storey high rise. Energy models were developed for each building, the mid-rise and high-rise by EQ Building Performance, and the very high-rise by RWDI Consultants. Models were developed for both energy code options offered in Supplementary Standard SB-10 (2017). The energy modellers then prepared list of energy conservation measures that would deliver an energy efficiency of 15%, and 20%, over SB-10 (2017). These results were compared with the energy efficiency targets (Total EUI and TEDI) and the emissions (GHGI). In all cases, the results fell short of the TGSIII targets, although in a couple of instances, it was close.