GREENPATH (PCMs for High Temperature)
Greenpath aims to enhance the value chain and reuse of agricultural residues for the production of sustainable energy through high-temperature conversion processes, integrated with high-efficiency thermal energy storage solutions.
Greendur is actively committed to the societal transition toward green energy and the decarbonization of the industrial sector. To this end, the company develops high-efficiency thermal energy storage (TES) technologies.
The integration of TES improves overall energy process efficiency by increasing the use of renewable energy, enabling waste-heat recovery, and optimizing the balance between energy generation and demand.
Within this framework, we are honored to participate in the Greenpath project, where Greendur contributes to enhancing the energy efficiency of high-temperature energy conversion systems from waste to fuels.
The Greenpath project integrates multiple energy conversion technologies that recycle agricultural residues and give them a second life by transforming them into high-value energy carriers, such as biofuels and syngas. These carriers can be used for energy generation or storage across a wide range of applications, thereby adding significant value to materials that would otherwise be considered waste.
Greendur’s main contributions to the project include:
• Development of an innovative high-efficiency thermal energy storage concept based on phase change materials (PCMs) for high-temperature applications. This TES system enables waste-heat recovery for preheating key components, such as fuel cells, thereby improving overall system efficiency.
• Design of a novel encapsulation strategy for high-temperature storage materials in a fixed-bed configuration. This approach has the potential to reduce TES costs by eliminating the need for expensive heat exchangers, while simultaneously increasing the area-to-volume ratio and, consequently, the power density of the storage system.
• Implementation of pressurized air as a heat-transfer fluid for high-temperature operation. This enables seamless integration with high-temperature energy conversion technologies, such as fuel cells operating at temperatures of up to 800 °C.
The Greenpath project is carried out by a consortium comprising TAFCO, Universidad Pública de Navarra (UPN), CENER, Greendur, Urzante, Sustainn, Harivenesa, and Nagrifood.
Convocatoria de Ayudas para realizar proyectos estratégicos de I+D en 2025-2028 de Gobierno de Navarra cofinanciada al 40% por el Fondo Europeo de Desarrollo Regional a través del Programa Operativo FEDER 2021-2027 de Navarra.
