Yehonatan Fein on Organic Rankine Cycle and Innovation

Yehonatan Fein on Organic Rankine Cycle and Innovation

by Yehonatan Fein

Applied Sciences & Engineering Energy THEnergy technology and engineeringTHYEnergy, power generation, distribution and storage
🎙 Yehonatan Fein 👥 248 📅 August 25, 2025 ⏱ 32 min 👁 132 📄 expert opinion 🧭 2026-08-17
Available in: English (current) Français

Keywords

ORCgeothermalturbineefficiencyworking fluid

Summary

In this episode of Geothermal Unleashed, host Elizabeth Cambre interviews Yehonatan Fein, an ORC power plant expert and project engineer at Vulcan Energy. Fein begins by sharing his career journey, starting at Ormat in 2015 and moving to Vulcan Energy after a decade. He explains the basics of Organic Rankine Cycles (ORC), emphasizing their ability to generate electricity from low to medium temperature heat sources, unlike conventional steam turbines. He describes the closed-loop system with four main components: vaporizer, turbine, condenser, and pump, using organic fluids like pentane or butane. Fein discusses thermal efficiencies, noting that small units achieve around 10-13% efficiency while larger units can reach 16-18% or slightly higher. He compares ORC and steam turbines, highlighting ORC’s advantages in lower temperature applications and reduced turbine blade wear due to dry expansion. The conversation covers how brine temperature and fluid properties affect ORC design and material selection, as well as typical unit sizes and footprints, ranging from 200 kW containerized units to 30-40 MW plants. Fein advises on modularity for redundancy and flexibility, and discusses lead times, which can be up to 2.5 years for large units. He touches on advanced working fluids and the combination of ORC with direct use applications like district heating and spa pools. Finally, he shares his vision for the future, noting the trend toward larger ORC units and the emergence of small-scale systems, positioning ORC as increasingly competitive with steam turbines.

238 words

Critical Evaluation

Value of the Information & Strength of the Argument

The value of the information lies in the practical, hands-on experience shared by Fein, who has worked on ORC projects ranging from 200 kW to 40 MW. He provides concrete examples, such as the 200 kW unit in Austria and large units in the US, and explains technical concepts in an accessible manner. The argumentation is coherent and logically structured, moving from basic principles to more complex considerations like efficiency, sizing, and future trends. However, the discussion lacks quantitative data and references to specific studies or performance metrics, which would strengthen the scientific basis. The claims about efficiency ranges and turbine longevity are plausible but not backed by empirical evidence or citations.

Scientific Rigor, Source Quality, Title Accuracy

The scientific rigor is moderate; the speaker relies on personal experience rather than citing specific research or publications. The description includes a disclaimer that the views are personal and not affiliated with Vallourec, but no external sources are provided. The title accurately reflects the content, focusing on the guest’s expertise and innovation in ORC. The discussion is informative but would benefit from references to industry reports or academic papers to enhance credibility.

199 words

Title / Content Match

The title accurately reflects the content, focusing on the guest's expertise in ORC and his insights on innovation in the field.

Quality & Reliability

7/10

The speaker is a project engineer with 10 years of experience at Ormat and currently at Vulcan Energy, providing credible practical insights. However, the discussion is largely anecdotal and lacks quantitative data or references to specific studies, limiting its scientific rigor.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Contribution & Novelties

The podcast provides a practitioner’s perspective on ORC technology, offering insights into real-world applications, sizing strategies, and maintenance advantages. It highlights the growing competitiveness of ORC against steam turbines and the trend toward modular and small-scale units. The discussion on combining ORC with direct use applications adds practical value.

Pour aller plus loin :

106 words

Radar Profile

The radar profile shows balanced scores across information quantity, quality, technical level, and reliability, indicating a well-rounded but not exceptional content. The high reliability score reflects the speaker's experience, while the moderate technical level suggests accessibility to a broad audience.

Reliability 7/10