TM-Sr. Principal Engineer (Global)-Shenzhen

Job description

Key Responsibilities

Lead the system-level design of direct expansion cooling systems, including refrigeration cycle scheme definition, thermal load calculation, refrigerant matching, compressor, evaporator, condenser, expansion device and control logic selection & matching. Conduct thermal & fluid simulation (heat transfer, refrigerant two-phase flow, pressure drop) and system performance prediction; define test specifications, organize bench & prototype testing, analyze test data, identify performance bottlenecks and drive design iteration.

Own reliability and robustness assessment of DX cooling systems, evaluate system behaviors under extreme ambient, partial load and transient operating conditions; identify failure modes and propose mitigation solutions. Collaborate closely with mechanical, electrical, controls, manufacturing and quality teams to translate system requirements into detailed design, support DFM review, resolve technical risks during prototype, pilot and mass production phases.

Provide technical support for product validation, field commissioning and customer escalations; diagnose complex DX system issues (capacity deviation, hunting, liquid flood-back, noise, reliability failure) and implement corrective actions. Track industry latest DX cooling technologies, refrigerants, components and standards; conduct benchmarking, technical feasibility study and technology pre-research for next-generation thermal platforms.

Compile system design documents, calculation reports, test plans, technical specifications and lessons learned; mentor junior thermal engineers and build up DX system capability within the team.

Required Qualifications & Skills

Bachelor or above in Thermal Engineering, Refrigeration & Cryogenic Engineering, Energy & Power Engineering or related thermal discipline. 10+ years hands-on experience in direct expansion refrigeration system design & development , solid understanding of vapor-compression refrigeration cycle, two-phase heat transfer, refrigerant properties and DX system control principles. Proven experience in DX system sizing, component matching, performance testing and troubleshooting; familiar with refrigeration components: scroll/compressor, fin-tube evaporator/condenser, TXV/EEV, accumulator, oil separator.

Experience using thermal simulation tools (e.g., EES, CoolProp, Fluent, or system cycle simulation tools); capable of thermal load calculation and system performance analysis. Familiar with relevant industry standards for cooling equipment, product reliability test methodology, environmental & safety requirements for refrigerants. Strong systematic thinking, good cross-team communication ability; able to prioritize multiple development projects under tight schedules.

Good English reading & writing capability for technical documents and global cross-team communication.

Preferred Qualifications

Experience in data center / mission critical cooling DX systems is a strong plus. Hands-on experience with low-GWP refrigerant application and system design optimization. Background in system controls for refrigeration circuits, EEV control algorithm tuning. Experience leading DX cooling new product introduction (NPI) from concept to mass production.