How to Design and Construct Concrete and Masonry to Comply with New Energy Codes-Introduction to ACI 122R-14- Guide to Thermal Properties of Concrete and Masonry Systems (PDF)

Introduction to ACI 122R-14- Guide to Thermal Properties of Concrete and Masonry Systems (PDF)

Pdf Summary

The document, "ACI/TMS 122R-14," provides a comprehensive update on thermal performance optimization for concrete and masonry materials. It is organized into eight chapters and an appendix and was revised from ACI/TMS 122-02 to enhance clarity and consistency. Notable updates include the introduction of a dedicated chapter for Notation and Definitions, removing dispersed definitions and notations from earlier versions. Moreover, the chapter on Thermal Mass has been retitled and refined to Thermal Inertia to distinguish between physical mass and its heat absorption/storage capabilities.<br /><br />Key features of the update include corrected formulas and reorganized tables for thermal properties, ensuring a clearer presentation for both SI and in-lb units. The document discusses in detail the thermal conductivity of concrete, aggregate, and cement paste, emphasizing moisture's impact on thermal performance.<br /><br />The document also delves into calculation methods for steady-state thermal resistance using the series-parallel approach, recognized in model codes, addressing traditional and advanced wall configurations. It explains the term "thermal inertia" as a crucial property affecting heat transfer, by describing factors such as thermal diffusivity and building design that influence it. For passive solar design, it covers properties like conductivity and specific heat.<br /><br />Additionally, chapter 7 focuses on condensation control, shedding light on strategies to avert moisture issues in wall systems using vapor retarders.<br /><br />The ACI/TMS 122R-14 aims to disseminate and maintain updated code requirements for energy-efficient building envelopes using concrete and masonry, reflecting its commitment to progressive code development and encouraging participatory engagement in committee activities.

Keywords

thermal performance

concrete

masonry materials

thermal inertia

thermal conductivity

moisture impact

steady-state thermal resistance

passive solar design

condensation control

energy-efficient building