STEPS TOWARD DESIGNING A POSITIVE ENERGY HOUSE: LESSONS LEARNT
This paper outlines the steps and measures taken in
designing a positive energy residential building in a
cold climate. The design team was given a fixed set of
occupant schedules and zone characteristics to design
with. Several energy modeling tools were employed
early on in the design process to identify the best
passive strategies that meet the building loads. The
envelope thermal properties were optimized by utilizing
GenOpt tool. In the next step, natural ventilation
controls were optimized based on the ambient air
temperatures and wind-driven ventilation potential.
After reducing the building loads to an optimal value
and leveraging the internal gains at different times of
the year, the energy needs of the building were met by
solar PV panels and wind turbines. Initial envelope
optimization resulted in approximately 80% reduction
of the total energy use intensity (EUI) to 34 kWh/m
which meets the Architecture 2030 challenge
requirements. The key strategies to meet this low EUI
were high efficiency ground source heat pump (GSHP),
air heat recovery, PV and wind production. This paper
discusses the lessons learnt and the applicability of the
tools to create a smooth workflow for the design of a
positive energy house.
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