b'to 90 per cent less energy than conventional buildings, containenergy modelling for the project, which included triple glazed quieter mechanical systems, meet very low air leakage limits and arewindows. The allowance had to be mindful of the window-to-wall designed to eliminate energy waste.ratio for both cost and energy reasons. Early results of the modeling were positive, and the design evolved within the allowance used in There are a number of challenges for the envelope to meet Passivethe energy modelling.House standards. Heat loss targets for Skeena required eight inches of exterior insulation, plus an insulated two- by six-inch cavity forCreating a comfortable environment for the 220 students living in the walls and 21 inches of insulation for the roofing. Every buildingthe residence was also a design challenge. The building design is opening must be carefully sealed to meet the airtightness levels. essentially a rectangular box, with only two doors for entry and exit. This design kept the budget for openings below the required level Another envelope issue was the positioning of the air barrier.and created efficiency gains that could be used in other parts of It is located on the exterior of the building so the barrier is notthe building.compromised by electrical, communications or air circulation outlets located on the interior walls. The building also has a curtainAnother challenge was to optimize the Primary Renewable Energy wall system to deal with large openings on the ground level.(PER) factors for the building and meet the requirements of Passive House. A case study by RDH dated May 6, 2019, stated, Our team To meet Passive House requirements, efficiency levels aremodeled actual data usage on appliance loads such as those from budgeted using modelling processes. The design team for Skeenamini fridges and dryers, and optimized the ASHRAE 62 and Passive established a window area budget or allowance to facilitate earlyHouse ventilation design. The design reduces lighting loads using Pilkington Energy Advantage CMeets ENERGY STAR 2020 ERThe new Pilkington Energy Advantage C allows for improved passive solar energy efficiency and reduction of thermal transmittance while maintaining the pyrolytic coating benefits of ease of handling and fabrication with a robust and durable surface. The Canadian ENERGY STAR 2020 specification for residential buildings can be met using Pilkington Energy Advantage C in various double glazed and triple glazed IGU configurations. 1.800.221.0444buildingproducts.pna@nsg.comwww.pilkington.usSPRING/SUMMER 2020 11'