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ABSTRACT
ASHRAE Research Project 1365 (RP-1365) had the objective to provide thermal performance data of 40 common building envelope details for mid- and high-rise construction. The goal was to develop procedures and a catalogue that will allow designers quick and straightforward access to information but with sufficient complexity and accuracy to reduce uncertainty in the thermal performance of building envelope components.
This paper provides an overview of RP-1365 and focuses on how the procedures and building envelope thermal performance catalogue can be utilized in practice for users of the ASHRAE Handbook- Fundamentals and developers of ANSI/ ASHRAE/IESNA Standard 90.1.
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INTRODUCTION
The reduced thermal resistance due to thermal bridging through steel and concrete framing can have a significant impact on the whole building energy performance. Designers of buildings are starting to respond by trying to better predict the heat loss through the building envelope by utilizing procedures outlined in the ASHRAE Handbooks and two-dimensional steady-state heat transfer software to determine the effective thermal resistance of assemblies. However, these methods require many assumptions to estimate the thermal performance of complex three-dimensional architectural details at intersections of walls, windows and roofs. This leads to potentially large uncertainty about the thermal performance of the building envelope, which can lead to inefficient design of HVAC systems, building operation inefficiencies, inadequate condensation resistance at intersections of components and compromised occupant comfort.
ASHRAE Research Project 1365 (RP-1365) had the objective to provide thermal performance data of 40 common building envelope details for mid- and high-rise building construction. The goal of the project was to develop procedures and a catalogue that will allow designers quick and straightforward access to information but with sufficient complexity and accuracy to reduce uncertainty in the thermal performance of building envelope components.
The principal audience for the project was the users of the ASHRAE Handbook - Fundamentals; however, the information advanced by the project should be of direct interest to the developers and users of energy standards, such as ANSI/ ASHRAE/IESNA Standard 90.1. The procedures and catalogue produced for RP-1365 provide simple and straightforward options to consider heat flow through major thermal bridges such as floor edge conditions, intersections of assemblies, or structural penetrations, not currently addressed by Standard 90.1.
A principal...