Evaluation of the thermal resistance of a roof-mounted multi-reflective radiant barrier for tropical and humid conditions: Experimental study from field measurements

TL;DR

This study experimentally evaluates the thermal resistance of a roof-mounted multi-reflective radiant barrier in tropical humid conditions, using dynamic measurements and airflow regulation to inform energy efficiency.

Contribution

It introduces a comprehensive experimental approach and a simulation method to assess the thermal performance of radiant barriers under specific climatic conditions.

Findings

Thermal resistance varies with seasonal conditions.

Airflow rate influences the barrier's effectiveness.

Experimental data supports improved roof insulation strategies.

Abstract

This paper deals with the experimental evaluation of a roof-mounted multi-reflective radiant barrier (MRRB), installed according to the state of the art, on a dedicated test cell. An existing experimental device was completed with a specific system for the regulation of the airflow rate in the upper air layer included in a typical roof from Reunion Island. Several experimental sequences were conducted to determine the thermal resistance of the roof according to several parameters and following a specific method. The mean method, well known in international standards (ISO 9869 - 1994) for the determination of the thermal resistance using dynamic data, was used. The method was implemented in a building simulation code in order to allow the determination of the thermal indicator automatically. Experimental results are proposed according to different seasonal periods and for different values of the airflow rate in the upper air layer.