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close this bookDesign Handbook on Passive Solar Heating and Natural Cooling (HABITAT, 1990, 162 p.)
View the document(introduction...)
View the documentForeword
Open this folder and view contentsIntroduction
Open this folder and view contentsI. Principles of passive solar architecture
Open this folder and view contentsII. The Australian climates and people
Open this folder and view contentsIII. Fundamentals of heat flow
Open this folder and view contentsIV. Thermal comfort
Open this folder and view contentsV. Basic design principles and strategies
Open this folder and view contentsVI. Bio-climatic analysis and comfort strategies
Open this folder and view contentsVII. Detail design
Open this folder and view contentsVIII. Final design evaluation
View the documentAnnex I: Relevant Australian standards
View the documentAnnex II: Glossary of terms
View the documentAnnex III: Metric units of measurements
View the documentAnnex IV: Typical internal heat loads for appliances
View the documentAnnex V: Minimum additional thermal resistance requirements
View the documentAnnex VI: Climate data for Sydney region - mean daily insolation for Sydney
View the documentAnnex VII: Selected thermal properties of various building material
View the documentAnnex VIII: Selected u-values and r-values
View the documentAnnex IX: Heating degree day data - new south Wales
View the documentAnnex X: Glass-mass performance graphs
View the documentAnnex XI: Appraisal graphs for the 5-star design rating system
View the documentAnnex XII: Sun position charts for Australian capital cities
View the documentAnnex XIII: Bibliography and suggested reading

Annex VIII: Selected u-values and r-values

U-values for solid floors in contract with the earth with tour exposed edges

Dimensions of floor

U-value (W/mN.degC)

Very long × 30 m broad

0.16*

Very long × 15 m

0.28*

Very long × 7.5m

0.48*

150 m × 60 m

0.11

150 m × 30 m

0.18

60 m × 60 m

0.15

60 m × 30 m

0.21

60 m × 15 m

0.32

30 m × 30 m

0.26

30 m × 15 m

0.36

30 m × 7.5 m

0.55

15 m × 15 m

0.45

15 m × 7.5 m

0.62

7.5 m × 7.5 m

0.76

3 m × 3 m

1.47

* This value applies also for any floor of this breadth and losing heat from two parallel edges. (Breadth here is the distance between exposed edges.)

Corrections to the above values for edge insulation floors

Dimensions of floor

Percentage reduction in U-value for edge Insulation extending to a depth (m)


0.25

0.5

1.0

Very long × 150m

2

6

10

Very long × 60m

2

6

11

Very long × 30m

3

7

11

Very long × 30m

3

8

13

Very long × 6m

4

9

15

Very long × 2m

6

15

25

150m × 150m

3

10

15

60m × 60m

4

11

17

30m × 30m

4

12

18

15mx 15m

5

12

20

6mx6m

6

15

25

2mx2m

10

10

35

Basic thermal resistance values for suspended floors directly above ground

Actual floor dimension Thermal resistance 1/ft + Rair + Re (m².°C/W)

Very long × 30m broad

5.3

Very long × 15m

2.8

Very long × 7.5m

1.7

150m × 60m

7.1

150m × 30m

4.6

60m × 60m

5.9

60m × 30m

4.0

60m × 15m

2.5

30m × 30m

3.4

30m × 15m

2.3

30m × 7.5m

1.6

15rn × 15m

2.0

15rn × 7.5m

1.4

7.5m × 7.5m

1.3

3m × 3m

0.8

The U-value of suspended floors can be estimated from this table where height above ground is not greater than approximately 1.5m and ventilation is limited. (The literature gives ventilation as 2000mm² per 1000mm of perimeter.)

1/fi = inside surface resistance
Rair = air space resistance vented as specified above
Re = resistance of the earth

Refer to table above for suspended floors. Source: IHVE Guide 1977-A3


U-values for various constructions


U-values for various constructions (Continued)


U-values for various constructions (Continued)


U-values for various constructions (Continued)


U-values for various constructions (Continued)