Standard
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AS 4508-1999
[Current]Specifies requirements relating to the optimum thermal resistance of insulation for rigid and flexible ductwork and associated fittings used in heating, airconditioning and evaporative cooling systems of buildings and dwellings.
Published: 05/02/1999
Pages: 14
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
PREFACE
1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DEFINITIONS
1.5 THERMAL PERFORMANCE
1.6 THERMAL RESISTANCE
1.7 CLASSIFICATION
1.8 EVALUATION
1.8.1 Thermal analysis
1.8.2 Economic evaluation
2 REQUIREMENTS FOR BULK INSULATION THERMAL RESISTANCE
2.1 SCOPE OF SECTION
2.2 INSULATION THERMAL RESISTANCE
2.3 TEST METHODS
2.4 CIRCULAR INSULATION
3 EQUATIONS
3.1 SCOPE OF SECTION
3.2 THERMAL PERFORMANCE
3.2.1 Insulation thermal resistance (RI)
3.2.2 Effective composite duct thermal resistance (REFF)
3.2.3 Radial heat transfer systems
APPENDIX A
A1 SCOPE
A2 ANALYSIS OF BUILDINGS—CASES 1 AND 2
A2.1 Building assumptions
A2.1.1 Residential buildings
A2.1.2 Commercial buildings
A2.2 System operation assumptions
A2.2.1 Case 1
A2.2.2 Case 2
A2.3 Calculation of Case 1 duct heat losses and gains
A2.4 Calculation of Case 2 duct heat losses and gains
A3 BOUNDARY CONDITIONS
A4 ANALYSIS OF RESULTS
APPENDIX B
B1 SCOPE
B2 METHODOLOGY
B3 CALCULATION OF COSTS AND BENEFITS
B3.1 Residential buildings
B3.2 Commercial buildings
B3.3 Analysis
B4 CONCLUSIONS AND RECOMMENDATIONS
APPENDIX C
C1 INTRODUCTION
C2 METHODOLOGY
C2.1 General
C2.2 Duct diameters
C2.3 Equations and relationships used
C2.4 Iterative analysis methodology
Cited references in this standard
[Current]
The use of ventilation and airconditioning in buildings, Part 2: Mechanical ventilation in buildings
[Superseded]
Methods of testing thermal insulation, Method 5: Steady-state thermal transmission properties by means of the heat flow meter
[Superseded]
Methods of testing thermal insulation, Method 6: Steady-state thermal transmission properties by means of the guarded hot plate
[Superseded]
Methods of testing thermal insulation, Method 7: Determination of the average thermal resistance of low-density mineral wool thermal insulation — Batt and blanket type