Green Ice 2025 Extension - Speed-controlled high-speed refrigeration compressor for high-efficiency applications

Achieving the necessary cost targets is a particular challenge and requires further experimental development of the new compressor platform, which will take place within the framework of Green Ice 2025 Extension. Only by achieving the cost targets can competitiveness and thus, in a broader sense, the preservation of Austrian jobs be secured. After a re-screening of market and target values, an analysis and evaluation of existing design versions and process concepts with focus on functionality and costs will be performed. Experimental investigations within the scope of WP4 (overall system testing) showed that on the one hand the target values for noise are achieved with the concept prototype, but on the other hand further investigations and measures to improve the solution concepts are required to achieve the target values for COP and costs. In particular, in the area of the gas line function group, the cause of an unacceptably high cooling power loss of around 20W must be found and eliminated. This requires a more detailed investigation of the concept prototype in the area of valve dynamics to identify any late shut-offs, leakage such as between cylinder and piston, between valves and valve seat, or between valve plate and valve plate seat, intake manifold heating, and pressure losses in the intake and discharge sections. This is followed by the derivation and evaluation of measures to eliminate the cooling power loss with the aid of experimental and simulation-based methods. The most promising measures will finally be tested in a further concept prototype. Due to the interaction between component design and process concept, adjustments to the component design will also be necessary. The functionality and target value achievement of the adapted component designs must be verified in prototype tests. Here, among other things, the measurement concept newly developed within the framework of Green Ice 2025 for the holistic quantitative evaluation of the thermodynamic processes in the gas line functional group will be applied. Finally, all process-oriented gas line components will be integrated into the Green Ice prototype, enabling a holistic investigation of the new compressor platform, taking into account all interactions between functional groups.