Background: In response to the utilization of various medium and low-temperature industrial waste heat at 100-300°C, a research team has set up a small organic Rankine cycle demonstration experimental platform with an output power of 3kW, which is operating well. Based on experimental data, an organic Rankine cycle system design software has been developed. This software can perform design calculations related to system performance, such as the selection of working fluids, equipment selection, parameter optimization, and the filling amount of working fluids, according to actual engineering conditions. The expander is one of the key components of the organic Rankine cycle. In order to study the performance of the working parts, a vortex expander performance experimental platform has been built using compressed air as the working fluid, which can be used for experimental research on vortex expanders or other small-to-medium sized expansion devices. Using CFD numerical analysis methods, the performance of the vortex expander can be simulated, allowing for the investigation of the impact of different geometric structures and operating parameters on the performance of the vortex expander. The application of vortex expanders in organic Rankine cycle systems on board is very necessary. Energy-saving products: Organic Rankine cycle system experimental platform; Experimental platform for small organic Rankine cycle systems using vortex expanders; Organic Rankine cycle system design software. Related technologies: Design and development of organic Rankine cycle systems, performance testing technology of vortex expanders, CFD simulation technology for the working process of vortex expanders. Technological innovation: Design and construction of an organic Rankine cycle system experimental platform, which operates smoothly and can achieve variable working condition regulation; The constructed vortex expander performance experimental platform can carry out wide-range performance experiments, providing guidance for the operation of vortex expanders in ORC systems. Energy saving effect: By utilizing low-grade waste heat resources, significant energy savings are achieved, with experimental test results showing a system cycle efficiency of about 5%.