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