PASSIVE SOLAR HEATING
Passive solar heating is about keeping the summer sun out and letting the winter sun in. It is the least expensive way to heat your home.
Northerly orientation of window areas.
Passive shading of glass.
Thermal mass for storing heat.
Minimising heat loss with insulation, draught sealing and advanced glazing.
solar houses can look like any other home but they are more
comfortable to live in and cost less to run.
Passive cooling is the least expensive means of cooling your home. It is appropriate for all Australian climates. Four key approaches should be examined:
Envelope design for passive cooling.
Natural cooling sources.
Hybrid cooling systems.
is an essential component of passive design.
It improves building envelope performance by minimising heat loss and heat gain through walls, roof and floors.
Externally insulated, dense materials like concrete, bricks and other masonry are used in passive design to absorb, store and re-release thermal energy. This moderates internal temperatures by averaging day/night (diurnal) extremes, therefore increasing comfort and reducing energy costs.
Windows and glazing are a very important component of passive design because heat loss and gain in a well insulated home occurs mostly through the windows.
good passive design, this is used to advantage by trapping winter
heat whilst excluding summer sun. Cooling breezes and air movement
are encouraged in summer and cold winter winds are excluded.
Window Energy Rating Scheme (WERS) is a system for rating both the
glass and the frame performance of windows in reducing heat loss and
heat gain. WERS
will help you to determine whether heating, cooling or both are more
important in your climate. It assists you in choosing the most
energy-efficient windows for your home and climate.
Shading of glass is a critical consideration in passive design. Unprotected glass is the single greatest source of heat gain in a well insulated home. Shading requirements vary according to climate and house orientation.
In climates where winter heating is required, shading devices should exclude summer sun but allow full winter sun to penetrate. This is most simply achieved on north facing walls. East and west facing windows require different shading solutions to north facing windows.
In climates where no heating is required, shading of the whole home and outdoor spaces will improve comfort and save energy.
A range of specific purpose modeling and rating tools has been developed to rate aspects of building performance for Australian conditions.