ACI-TMS CODE-122.3-24: Thermal Properties of Concrete and Masonry for Use in Determining Energy Code Compliance Except for Low-Rise Residential Buildings—Code Requirements and Commentary

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Description

This Code prescribes minimum design and construction requirements for energy efficiency of building envelopes of new buildings and additions to buildings. It applies to buildings having concrete walls, roofs, or floors; masonry walls; and masonry veneer, including veneer attached to frame walls as part of the building envelope. It also provides minimum thermal properties for these assemblies for code compliance.

This Code is applicable to commercial and mid- to high-rise residential buildings that use either electricity from any generation source or fossil fuel. It can be used with applicable energy codes and standards such as ASHRAE 90.1 and the International Energy Conservation Code (IECC).

Keywords:

energy efficiency; specific heat; thermal conductivity; thermal diffusivity; thermal resistance; thermal transmittance.

 

Document Details

Author: Joint ACI-TMS Committee 122

Publication Year: 2024

Pages: 111

ISBN: 9781641952545

Formats: Protected PDF/Web View

Table of Contents

CHAPTER 1—GENERAL, p. 3

1.1—Scope, p. 3

1.2—General, p. 3

1.3—Purpose, p. 3

1.4—Applicability, p. 3

1.5—Interpretation, p. 4

CHAPTER 2—NOTATION AND DEFINITIONS, p. 5

2.1—Code notation, p. 5

2.2—Code definitions, p. 5

CHAPTER 3—REFERENCED STANDARDS, p. 7

3.1—American Concrete Institute (ACI), p. 7

3.2—American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), p. 7

3.3—ASTM International, p. 7

3.4—International Code Council (ICC), p. 8

CHAPTER 4—GENERAL REQUIREMENTS, p. 9

4.1—Material requirements, p. 9

4.2—Climate zones, p. 9

4.3—Building envelope compliance, p. 9

CHAPTER 5—PRESCRIPTIVE METHOD, p. 10

5.1—Concrete and masonry, p. 10

5.2—Other assemblies, p. 13

CHAPTER 6—BUILDING ENVELOPE TRADE-OFF METHOD, p. 14

6.1—Building envelope trade-off method, p. 14

CHAPTER 7—WHOLE-BUILDING SIMULATION METHOD, p. 15

7.1—Whole-building simulation model, p. 15

CHAPTER 8—THERMAL PROPERTIES FOR DETERMINING COMPLIANCE, p. 16

8.1—U-factors, C-factors, and R-values of assemblies, p. 16

8.2—Thermal conductivity, p. 94

8.3—Thermal inertia including heat capacity and specific heat, p. 95

8.4—Solar reflectance and solar reflectance index, p. 97

COMMENTARY REFERENCES, p. 98

Authored documents, p. 98

Software, p. 99

APPENDIX A—CLIMATE ZONE MAPS, p. 100

APPENDIX B—THERMAL CONDUCTIVITY, p. 101

B.1—Thermal conductivity of concrete, concrete masonry, and clay masonry, p. 101

B.2—Influence of moisture, p. 102

B.3—Thermal conductivity of aggregates and cement paste, p. 102

B.4—Thermal conductivity of concrete used in CMU, p. 103

B.5—Practical thermal conductivity, p. 103

APPENDIX C—THERMAL INERTIA (THERMAL MASS), p. 105

C.1—Thermal mass in walls, p. 105

C.2—Thermal mass in buildings, p. 106

APPENDIX D—THERMAL PERFORMANCE OF WALLS WITH MASONRY VENEER, p. 107

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