Passive Systems

Passive systems involve adopting a plan layout and building form that minimise the need for heating and eliminate the need for cooling in the Sydney climate.

A cool building in summer is achieved by limiting eastern, northern and western sun penetration into the dwelling. This is achieved through the use of shading devices, and reflective insulation. It is possible to design shading devices that block out summer sun, yet allow winter sun, these devices do not have to be adjustable due to the fact that the sun is much higher in the sky in summer than it is in winter. Utilising Solar angle calculations can achieve effective design solutions with great accuracy.

In addition, orientating the building's openings to best capture cooling summer breezes from the east and south, encouraging cross ventilation. Thermal mass floors and walls absorb heat, releasing it at night, where cross ventilation is used to flush the warm air out of the building.

A warm building in winter is achieved by orientating the house to maximise solar penetration, best orientation to the north and east. Thermal mass in the ceiling, and bulk insulation in the walls retain the warm air in the building at night. (this may not be necessary given the buildings function). Openings need to be well sealed, as they are potentially a great source of heat loss.