García Márquez, BeatrizPartal López, PedroNavarro Domínguez, Francisco JavierDelgado Sánchez, ClaraCuadri Vega, Antonio Abad2025-11-192025-11-192025García-Márquez, B., Partal, P., Navarro, F. J., Delgado-Sánchez, C., & Cuadri, A. A. (2025). Solid-to-solid phase change transitions to enhance solar heat storage of bitumen used in domestic hot water collectors. Construction and Building Materials, 495, 143681. https://doi.org/10.1016/j.conbuildmat.2025.143681. [Dataset]. AM (Depósito de Investigación de la Universidad de Huelva).https://hdl.handle.net/10272/27415Project "Development of bituminous products formulated with solid-solid phase change materials for improving the building energy efficiency" (SSbuildENERGY), PID2023-149701OA-I00, funded by MCIN/AEI/10.13039/501100011033 (Spanish Ministry of Science,Innovation and Universities) and ERDF "A way of making Europe" under the 2023 Knowledge Generation projects call. This project is led from the University of Huelva and developed at Center for Research in Chemical Products and Process Technology (Pro2TecS). The general objective of this project is to study the formulation and processing of novel energy-efficient building materials with enhanced rheological and thermal energy storage characteristics formulated with solid-solid phase change materials.The reduction of energy consumption in buildings requires the development of advanced thermal energy storage (TES) materials. In this work, the feasibility of TES materials to be applied in solar domestic hot water (DHW) collectors was evaluated. These TES materials are composed of bitumen (B) and different concentrations of pentaglycerine (PG), which act as supporting engineering material with high solar radiation absorptivity and solid-to-solid phase change material, respectively. Results indicate that these TES materials show good thermal stability, whereas their consistency improves as PG content increases over the whole temperature range at which a solar DHW collector operates. Interestingly, blend containing 30 wt% PG shows a high heat storage capacity (ca. 50 J/g), suitable thermal cycling reliability and excellent relative enthalpy efficiency (ca. 90 %). In addition, this binder also presents improved thermal properties (thermal conductivity and specific heat capacity). As a result, the heat charge/discharge performance evaluated by indoor thermoregulation tests leads to a Latent Heat Thermoregulation Index (LHTI) higher than those reported for other TES building materials. Therefore, B/PG blends may be considered a promising TES material for improving energy efficiency in solar DHW production.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Thermal energy storageSolid-solid phase change materialsHeat charge/discharge performanceSolar collectorProduct engineeringdataset10.33776/ariasmontano.2741510.1016/j.conbuildmat.2025.143681open access3303 Ingeniería y Tecnología Químicas