Process and Thermal Performance Intern

This is an opportunity to work alongside an outstanding, multidisciplinary engineering team in a fast-paced startup environment. You will be part of Rondo’s Core Technology team and contribute directly to the analysis and development of thermal and fluid systems at the heart of our high-temperature heat battery platform — performing real engineering calculations that shape how our systems are designed, optimized, and deployed.

What You Will Do ( key responsibilities for this role include but are not limited to) :

• Support thermal and fluid performance analyses using 1D simulation tools (e.g., AFT, Ebsilon, Aspen, or equivalent) and first-principles hand calculations to characterize system behavior across operating conditions.

• Assist in sizing and performance evaluation of fluid system components including pumps, blowers, fans, heat exchangers, valves, dampers, and air-flow equipment.

• Develop and validate steady-state and transient thermal models for energy storage and heat transfer systems, comparing simulation outputs against test data and analytical predictions.

• Perform pressure drop, flow distribution, and energy balance calculations for ducting networks, piping systems, and process loops.

• Apply fundamental thermodynamic and fluid mechanics principles to evaluate system efficiency, identify performance bottlenecks, and support design improvements.

• Assist in developing and maintaining engineering calculation packages, spreadsheets, and simulation scripts used for design verification and performance tracking.

• Support test planning and data reduction: process raw test data, produce performance plots, and compare results against model predictions.

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