sunlight
indirect
direct
ambient
climate Melbourne = temperate
RMIT University
2
39 percent of energy consumed in Australian homes is space heating and cooling
RMIT University
3
Passive solar heating requires careful application of the following passive design principles: • Northerly orientation of daytime living areas. • Appropriate areas of glass on northern facades. • Passive shading of glass. • Thermal mass for storing heat. • Insulation and draught sealing. • Floor plan zoning based on heating needs. • Advanced glazing solutions
RMIT University
4
site
RMIT University
5
RMIT University
6
sun path
RMIT University
7
RMIT University
8
RMIT University
9
RMIT University
10
RMIT University
11
RMIT University
12
SUMMER maximum Vertical Shadow Angle
76° RMIT University
13
WINTER maximum Vertical Shadow Angle
28° RMIT University
14
RMIT University
15
RMIT University
16
RMIT University
17
BCA Requirements The Objective of this Section is to reduce greenhouse gas emissions by efficiently using energy.
PART J2 EXTERNAL GLAZING J2.3 Glazing (a) The aggregate conductance and solar heat gain of the glazing in each storey of a sole-occupancy unit or public area must not exceed the values obtained by multiplying the floor area of the sole-occupancy unit or public area, measured within the enclosing walls, by— (i) for conductance, the constant CU; and (ii) for solar heat gain, the constant CSHGC, obtained from Table J2.3a.
RMIT University
18
BCA Requirements PART J2 EXTERNAL GLAZING (b) The aggregate conductance and solar heat gain of the glazing in each storey of a sole-occupancy unit or of each public area must be calculated by adding the conductance and solar heat gain of each glazing element in accordance with the following formulae— (i) For conductance:
RMIT University
19
PART J2 EXTERNAL GLAZING J2.5 Shading Where shading is required to comply with J2.3, it must— (a) be provided by a permanent feature such as a verandah, balcony, fixed canopy, eaves or shading hood, which— (i) extends horizontally on both sides of the glazing for the same projection distance P in Figure J2.4; or (ii) provides the equivalent shading with a reveal or other shading element; or (b) be provided by a shading device, such as a shutter, blind, vertical or horizontal building screen with blades, battens or slats, which— (i) is capable of restricting at least 80% of summer solar radiation; and (ii) if adjustable, is readily operated either manually, mechanically or electronically by the building occupants.
An adjustable shading device that is capable of completely covering the glazing may be considered to achieve a P/H value of 2.
RMIT University
20
A building wall, including the glazing it contains, is considered to face north if it faces any direction in the north orientation sector of Figure J2.3. The orientation of other walls, including the glazing they contain, are determined in a similar way.
RMIT University
21
global dimming RMIT University
22
RMIT University
23