制冷系统研发科学家Research Scientist on HVAC Refrigeration System_CR

Job description

Conduct research and development of advanced refrigerant cycle structure and control strategy for household and mobility application Focus is on refrigerant cycle and key components concepts investigation, innovative structure and component concept design, requirement engineering, system modeling and simulation, validation. Work closely with corporate research hub in Renningen, Germany on project activities and competence development. Work closely with business units to supply cutting-edge simulation solutions and transform them into product development workflows. Main responsibility includes: Lead and participate research topics on advanced and innovative refrigerant cycle towards low GWP refrigerant, including simulation and verification. Construct refrigeration system dynamic and steady-state model libraries from scratch, including 1D models for compressor, expansion valve, heat exchanger, and pipes and system identification models. Develop system-level dynamic and steady-state models for room air conditioners (RAC) and VRF multi-split systems, covering inverter compressors, electronic expansion valves (EEV), multi-evaporator refrigerant distribution networks, fans, and air-side heat exchangers. Build control-oriented reduced-order models (ROM) of RAC/VRF systems and develop control strategies in advanced methods. Define experimental schemes and testing protocols for both steady-state and dynamic modeling, providing reliable data for model validation and accuracy improvement Apply and extend the above capabilities to the wider HVAC product portfolio — in particular room air conditioners (RAC) and VRF multi-split systems — covering air-side modeling, energy-efficiency simulation, and control-oriented model development. Support project activities to transfer deliverables to business units successfully. PhD degree, or master's degree with min. 3 years working experience, in Power Engineering & Engineering Thermo-physics, Refrigeration & Cryogenics, Thermal Energy, or related disciplines. Solid foundation in heat transfer, fluid mechanics, and engineering thermodynamics is required. Minimum 3 years of experience in refrigeration or HVAC system modeling and simulation. Experience in building simulation platforms from scratch is strongly preferred. Proficient in 1D simulation tools (Dymola is a must). Familiar with Simulink. Strong programming skills in Python and Modelica. Proficiency in MATLAB is required. C++/C# development capability is a plus. Practical experience in Finite Volume Method (FVM) modeling, model convergence optimization, and simulation speedup improvement is highly valued. Experience with automated calibration workflow development and correlation database construction is a plus. Hands-on modeling experience with room air conditioners (RAC) and/or VRF multi-split systems is strongly preferred, including air-source heat pumps, wet-coil air-side modeling, and frosting/defrosting physics Familiar with HVAC energy-efficiency standards and rating procedures (APF/SEER/IEER; GB/T 7725, AHRI 210/240, ISO 15042) and the psychrometrics of moist air Experience with Modelica-based HVAC/thermo-fluid libraries (e.g., TIL, TFS, Buildings/AixLib) and refrigerant property interfaces (REFPROP/CoolProp/ExternalMedia, e.g., R32/R410A/R290) is a plus Excellent communication and coordination skills; strong written and verbal expression in English. Efficient, goal-oriented, structured working style. Strong documentation and writing skills. Passionate for innovation, proactive, self-motivated, and highly responsible. 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