ENGINEERING

Subject Matter Expert (SME)

CO2 Refrigeration Systems & Ejector Test Rig Development

ExperienceTypically 10 to 15+ years of relevant engineering experienceDomainIndustrial refrigeration, thermodynamics and CO (R744) systems Reporting to Engineering Leadership / Business Unit Head1. Role Overview

We are seeking an experienced Subject Matter Expert (SME) in CO refrigeration systems to lead the technical development of an advanced ejector test rig for a commercial refrigeration application. The SME will own technical requirements, validate the existing system concept, establish the design basis, and drive engineering deliverables across thermodynamic analysis, refrigeration circuit design, mechanical integration, instrumentation, controls and testing.

The role requires hands-on expertise in transcritical and subcritical CO refrigeration, ejector performance evaluation, heat-balance management and oil recovery. The SME will work with the customer and multidisciplinary engineering teams to ensure that the system meets the agreed operating envelope, performance objectives, safety requirements and project deliverables.

- Key Responsibilities

A. Technical Requirements & Concept Validation
- Review customer requirements, operating envelopes, existing P&IDs; and preliminary system concepts.
- Translate requirements into a structured technical specification, design basis and verification plan.
- Validate thermodynamic feasibility and assess HP, MP and LP circuit configurations.
- Identify technical gaps, design risks, limitations and optimization opportunities.
- Lead technical discussions with the customer and secure concept approval before detailed engineering.

B. CO Refrigeration System Design
- Lead design and optimization of transcritical and subcritical CO refrigeration systems.
- Perform or guide thermodynamic calculations, mass and energy balances, heat-load calculations and performance assessments.
- Define pressure, temperature, refrigerant mass-flow and cooling-capacity operating envelopes.
- Develop solutions for independent control of high-pressure and low-pressure operating conditions.
- Evaluate gas coolers, evaporators, liquid receivers, compressors, internal heat exchangers, subcoolers and expansion devices.
- Assess two-phase flow, part-load operation, heat balance and integration with external refrigeration and glycol circuits.

C. Ejector Testing & Performance Evaluation
- Define test methodology and test matrices across motive pressure, suction pressure, discharge conditions and load.
- Specify tests for transcritical, subcritical and two-phase operating conditions.
- Define performance parameters, including pressure lift, mass flow, cooling capacity and system performance mapping.
- Establish data-analysis methods, test procedures and measurement-uncertainty requirements.

D. Oil Management & System Optimization
- Develop and validate the oil circulation, separation and recovery strategy.
- Evaluate oil ejectors, oil pumps and alternative oil-return configurations, including potential redundancy.
- Address oil-return challenges associated with evaporators and low-pressure operating conditions.
- Assess auxiliary heating and other measures needed to maintain system stability.

E. Mechanical Design & Engineering Coordination
- Review and guide P&IDs;, system layouts, piping arrangements and equipment specifications.
- Drive development of the complete 3D system design with mechanical design engineers.
- Define equipment positioning, piping interfaces, maintainability and integration requirements.




- Coordinate component sizing and selection with design and procurement teams.
- Ensure mechanical design aligns with the approved thermodynamic design basis and laboratory constraints.

F. Instrumentation, Electrical & Controls
- Define instrumentation requirements for pressure, temperature, mass flow, power and other performance parameters.
- Establish measurement ranges, accuracy requirements and data-acquisition needs.
- Define control philosophy, operating sequences, alarms, interlocks and safety-related requirements with relevant specialists.
- Coordinate with electrical, controls and LabVIEW engineers on sensors, actuators, hardware and data acquisition.
- Validate the control strategy against the required operating envelope and test scenarios.

G. Testing, Validation & Technical Acceptance
- Develop system verification and validation plans and define acceptance criteria.
- Lead technical reviews, design verification and resolution of engineering issues.
- Support integration, commissioning, performance testing and troubleshooting as agreed in the project scope.
- Ensure calculations, assumptions, test results and engineering decisions are documented.

H. Technical Project Leadership & Customer Management
- Act as the primary technical interface with the customer for requirements and design decisions.
- Drive design reviews, milestones, issue resolution and closure of open technical points.
- Coordinate thermodynamics, mechanical, electrical, instrumentation and software teams.
- Track dependencies, resource needs, schedule risks and deliverable quality.
- Provide technical guidance and mentoring to engineering team members.

1. Key Technical Deliverables

- Requirements specification: consolidated customer requirements, operating envelope and test scenarios.
- Concept validation report: feasibility assessment, thermodynamic calculations, heat-balance analysis, risks and recommendations.
- Approved design basis: system architecture, operating limits, assumptions and design decisions.
- P&ID; and system definition: process flow, circuit configuration, instrumentation and component interfaces.
- Component specifications: sizing and selection criteria for major refrigeration components.
- 3D design coordination: review of equipment layout, piping and system integration.
- Instrumentation and control requirements: measurement specifications, control philosophy, alarms, interlocks and LabVIEW interfaces.
- Test and validation plan: test matrix, performance parameters, data-acquisition requirements and uncertainty assessment.
- Engineering verification records: design reviews, calculations, risk register and issue-closure records.
- Commissioning and acceptance support: technical troubleshooting, performance validation and closure of technical issues.

The SME is accountable for driving and coordinating these deliverables with the relevant specialists. Detailed CAD, electrical and software outputs may be produced by dedicated team members.
- Mandatory Technical Skills

- Strong expertise in industrial refrigeration and thermodynamic system design.
- Practical experience with CO (R744) systems, preferably transcritical booster or advanced refrigeration architectures.
- Strong understanding of refrigerant properties,



pressuretemperature relationships, mass and energy balances, and two-phase flow.
- Experience with refrigeration system sizing, heat exchangers, compressors, expansion devices and pressure-control strategies.
- Knowledge of ejector technology, operating principles and performance evaluation.
- Experience with oil separation, oil circulation and oil-return systems.
- Ability to interpret and review P&IDs;, equipment specifications and refrigeration system layouts.
- Experience defining instrumentation, measurement accuracy, data acquisition and test procedures.
- Proven ability to lead technical reviews, resolve complex engineering issues and communicate with customers.

1. Preferred Skills

- Experience developing refrigeration test rigs, experimental facilities or laboratory validation systems.
- Experience with ejector-based refrigeration cycles and performance mapping.
- Familiarity with EES, REFPROP, CoolProp or equivalent thermodynamic calculation tools.
- Working knowledge of 3D CAD tools and piping/system design coordination.
- Exposure to PLC-based controls, LabVIEW, data acquisition and automated test systems.
- Familiarity with pressure-equipment requirements, refrigeration safety practices and applicable standards.
- Experience with design verification, uncertainty calculations and experimental test validation.

1. Education & Experience

- Bachelors or masters degree in Mechanical Engineering, Refrigeration and Air Conditioning, Thermal Engineering or a related discipline.
- Typically 1015+ years of relevant experience, including substantial hands-on involvement in industrial refrigeration systems.
- Demonstrated experience taking complex refrigeration projects from concept development through detailed engineering and system validation.
- Previous technical leadership experience coordinating multidisciplinary engineering teams and customer stakeholders.

Relevant CO refrigeration and ejector experience should carry more weight than total years of experience alone.
- Key Performance Indicators (KPIs)

- Timely validation and approval of the system concept.
- Completeness and accuracy of technical requirements and the design basis.
- Feasibility of the required operating envelope and test scenarios.
- Quality and completeness of engineering deliverables.
- Effective coordination across mechanical, electrical, instrumentation and software teams.
- Closure of technical risks and design issues within agreed timelines.
- Successful integration and achievement of agreed performance and acceptance criteria.

1. Ideal Candidate Profile The ideal candidate is a technically robust refrigeration specialist who can independently understand the thermodynamics of a complex CO system, challenge design assumptions, make sound engineering decisions and lead the project through its technical lifecycle. The candidate must be capable of engaging directly with the customer, translating requirements into engineering solutions, guiding the design team and ensuring that the delivered test rig performs as intended. Primary selection criterion: demonstrated expertise in CO refrigeration system design and thermodynamic validation, supported by the ability to lead multidisciplinary engineering execution.

2. Suggested Candidate Screening Weightage CompetencyWeightCO refrigeration and thermodynamic system design30%Ejector technology and performance testing20%Heat balance, subcooling and oil management20%Technical leadership and customer management20%Instrumentation, controls and test-rig integration10%

Confidential | SME CO Refrigeration & Ejector Test Rig

📌 Subject Matter Expert (SME)Refrigeration Systems & Ejector Test (Bengaluru)
🏢 Creative Synergies
📍 Bengaluru