The name Passive House is derived from the German term “Passiv Haus”, which describes a building with an extremely reduced (passive) heating system, versus conventional buildings with large (active) systems.
Energy Conservation First
Passive House is an “energy conservation first” approach. The basic idea is to radically minimize heat loss through effective heat retention, and maximize passive solar and internal heat gains. In our local climate, the sun can provide up to 50% of the energy needed to heat a Passive House. Internal heat gains provide an additional 15%.
The Passive House building energy standard limits the amount of energy a building can consume per square foot of usable floor space and year. The limit for heating and cooling energy is 4.75kBtu, and the limit for source energy accounted for at the utility is 38kBtu. Air tightness of the structure is limited to 0.6 air changes at 50 Pascal pressure.
Designs are modeled with a scientific energy modeling software called the Passive House Planning Package, and field tested for various parameters during and after construction. Design and field testing are submitted to the Passive House Institute U.S. for certification.
With its low energy consumption—as little as 10% of standard code-compliant buildings—Passive House buildings perform at an estimated 15 on the HERS scale, meet the 2020 requirements for the Architecture 2030 Challenge today, and can meet energy and carbon neutral goals for operation with a modest amount of renewable energy systems.
Watch for some new Passive House project from Image Design coming soon!!!!!!