Thermal optimization and performance analysis of an innovative wooden radiant heating system made for room temperature control: Laboratory and numerical investigation of prototypes
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The development of an innovative radiant heating system, made for room temperature control, requiresextended laboratory and numerical analysis. The multilayered wooden structure design in particular isa challenging aspect due to thermal and hygric transport processes. This article focuses on a thermaloptimization process, which aims at increasing the heating performance of first panel prototypes.In a first step, a numerical analysis was performed evaluating design parameters, which contribute to anefficient heating curve of the system. Subsequently, prototypes were defined and produced in pilot plantscale. Comprehensive measurements, performed within a climate chamber, focused on an investigationof hygrothermal transport processes within the wooden panel. Surface temperatures were measured bymeans of an infrared thermographic camera and temperature sensors. Furthermore, surface heat fluxwas recorded and relative humidity was measured at defined positions within the panel’s cross section.The obtained data sets contribute to a calibrated numerical model, which takes into account anisotropicmaterial properties. Additionally, dimensional stability was analyzed within a double climatic chamber.An optimized panel variant is found to have an average surface temperature 3.4°C higher than a firstprototype. Additionally, considering anisotropic material properties within a numerical model allows forthe optimization of energy transport processes.