AS 4508-1999

1 - AS 4508-1999 THERMAL RESISTANCE OF INSULATION FOR DUCTWORK USED IN BUILDING AIRCONDITIONING
4 - PREFACE
6 - CONTENTS
7 - SECTION 1 SCOPE AND GENERAL
7 - 1.1 SCOPE
7 - 1.2 APPLICATION
7 - 1.3 REFERENCED DOCUMENTS
7 - 1.4 DEFINITIONS
8 - 1.5 THERMAL PERFORMANCE
8 - 1.6 THERMAL RESISTANCE
8 - 1.7 CLASSIFICATION
8 - 1.8 EVALUATION
8 - 1.8.1 Thermal analysis
8 - 1.8.2 Economic evaluation
9 - SECTION 2 REQUIREMENTS FOR BULK INSULATION THERMAL RESISTANCE
9 - 2.1 SCOPE OF SECTION
9 - 2.2 INSULATION THERMAL RESISTANCE
9 - 2.3 TEST METHODS
9 - 2.4 CIRCULAR INSULATION
10 - SECTION 3 EQUATIONS
10 - 3.1 SCOPE OF SECTION
10 - 3.2 THERMAL PERFORMANCE
10 - 3.2.1 Insulation thermal resistance (RI)
10 - 3.2.2 Effective composite duct thermal resistance (REFF)
10 - 3.2.3 Radial heat transfer systems
12 - APPENDIX A - THERMAL ANALYSIS OF DUCT INSULATION
12 - A1 SCOPE
12 - A2 ANALYSIS OF BUILDINGS- CASES 1 AND 2
12 - A2.1 Building assumptions
12 - A2.2 System operation assumptions
13 - A2.3 Calculation of Case 1 duct heat losses and gains
15 - A2.4 Calculation of Case 2 duct heat losses and gains
16 - A3 BOUNDARY CONDITIONS
16 - A4 ANALYSIS OF RESULTS
17 - APPENDIX B - ECONOMIC EVALUATION AND RESULTS
17 - B1 SCOPE
17 - B2 METHODOLOGY
17 - B3 CALCULATION OF COSTS AND BENEFITS
17 - B3.1 Residential buildings
17 - B3.2 Commercial buildings
17 - B3.3 Analysis
18 - B4 CONCLUSIONS AND RECOMMENDATIONS
19 - APPENDIX C - COMPARISON OF ROUND AND PLANAR INSULATION
19 - C1 INTRODUCTION
19 - C2 METHODOLOGY
19 - C2.1 General
19 - C2.2 Duct diameters
19 - C2.3 Equations and relationships used
20 - C2.4 Iterative analysis methodology

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.

This Standard sets out requirements relating to the optimum thermal resistance of insulation for rigid and flexible ductwork and fittings used in heating, ventilating and airconditioning (HVAC) systems of buildings and dwellings.

First published as AS 4508-1999.
Reissued incorporating Amendment No. 1 (November 2000).