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The use of a large-scale prototype to investigate the actual performance of a Heat Exchanging Asphalt Layer

Book Contribution - Book Chapter Conference Contribution

In October 2017 a large-scale prototype for a Heat Exchanging Asphalt Layer (HEAL) was constructed in a cycling path, together with other innovative technologies, such as Fibre Bragg Gratings to monitor the stress and strains, and fiber-reinforced asphalt in the top layer. The HEAL prototype consists of 30 m², 8.5 m x 3.5 m, and includes four circuits of pipes, 50 m of length each, placed in a collector layer. Additionally, two boreholes with a depth of approximately 100 m have been installed next to the cycling path so that heat can be extracted from the HEAL during summer and is available during winter to keep the cycling path ice and snow-free. By using an additional heat pump an overall better efficiency will be obtained. Different sensors to monitor the temperature of the asphalt and fluid were installed, together with a weather station that captures the most important weather parameters, such as wind speed, outside temperature, solar radiation, … By changing the way the different circuits of pipes are connected, it is possible to investigate the influence of total pipe length and pipe layout. Also, the input temperature and flow rate of the water will be controlled and varied during the experiments. An overview of the complete design, including all sensors and electromechanical devices, is given in this paper. Furthermore, some details are included from an extended Finite Element Model which will be validated using the experimental results from the large-scale prototype.
Book: Proceedings of the 7th Eurasphalt & Eurobitume Congress v1.0, 16th-18th June, 2021
Pages: 1 - 11
Publication year:2020
Keywords:Engineering sciences. Technology