Radiators have strong potential for reuse, but early assessment of their heat output is essential – yet often challenging due to variations in size, design, and materials. Our goal is to simplify the reuse of radiators by linking heat output estimation to data that can be easily gathered on-site. The method will be integrated into an Excel-based tool with a user-friendly interface, enabling even non-experts to make reliable assessments. The tool is built on practical data and experience from Zirkular GmbH and Bauteilbörse and is supported by thermal modelling from the Lucerne University of Applied Sciences and Arts.

The project aims to develop a practical tool that allows users to easily catalogue radiators and estimate their heat output. It includes identifying common radiator types, building and validating a thermal model, creating a user-friendly interface, and testing the tool for accuracy and usability. The final goal is a functional prototype that supports professionals in assessing and reusing radiators efficiently.

Our tool promotes circularity by facilitating radiator reuse through streamlined documentation and automated performance assessment. By simplifying the documentation, evaluation and cataloguing of existing radiators, their life cycles can be extended − reducing raw material extraction, emissions from new production, and construction waste. This enables more resource-efficient practices and supports a low-emission, circular built environment.