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Description
The project will analyse potentials and feasibility of prospective expanders for organic Rankine cycles (ORC) based on impulse turbomachines and rotary vane expanders in power range of 1-50 kW. Based on three case studies (micro-cogeneration, waste heat recovery and low-temperature geothermal) three expanders will be designed (and optimised), built and tested: one rotary vane and two impulse turbines, including one highly innovative concept, for two different working fluids. Geometries and experimental data including many off-design operation states will be summarised and published to boost industrial development as well as research on expanders in this field. Feasibility mapping will be performed and published over the range of power and applications for the considered expander types.
Summary of project results
The DEXPAND project focused on developing efficient and cost-effective expanders for small-scale distributed energy systems. These systems utilize renewable or waste heat sources to generate power, but their efficiency is often limited by the performance of the expander, which converts thermal energy into mechanical work.
The project analyzed the potential and feasibility of different expander technologies, including impulse turbomachines and rotary vane expanders, for various ORC applications. This involved creating feasibility maps to guide the selection of appropriate expander types for different power ranges and applications. The next step was design, optimization, and manufacturing. Three different expanders were designed, optimized, and built: one rotary vane expander and two impulse turbines, including a highly innovative concept. These expanders were tailored to specific working fluids and operating conditions. The development was followed by experimental testing and data collection.
The project successfully developed and tested four functional expander samples (three turbines and one volumetric expander), demonstrating their potential for use in small-scale distributed energy systems. The project generated valuable experimental data and design models, which can be used by researchers and industry to improve the efficiency and performance of expanders. The project''s results, including models and data, were made openly accessible to maximize their impact and facilitate further research and development. The results can benefit a wide range of stakeholders in both research and industry, as well as end-users. The project contributed to the promotion of sustainable energy solutions and reduced reliance on fossil fuels.
Summary of bilateral results
The project would not have been successful without bilateral cooperation. Bilateral joint research and collaboration on joint results has strengthened the knowledge of all involved and strengthened the bilateral relations that will lead to further cooperation.