Sr. Principal Engineer (Global)

Sr. Principal Engineer (Global)

Shenzhen-xili, China

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.