Development of a High-Temperature sCO2 Brayton cycle Test Loop
Subcategory (under Clean Energy): Cross Cutting
Technology Readiness Level (TRL): TRL 4 - Early prototype
Technology Outline (Process Description)
IISc has been a pioneer in India in research on supercritical carbon dioxide (sCO2) power generation and transcritical (tCO2) carbon dioxide cooling. It has indigenously developed a state-of-the-art Brayton cycle power loop to demonstrate the sCO2 power generation technology. sCO2 technology being agnostic to heat source can be tailored to a variety of heat sources such as solar, small modular nuclear reactor (SMR), geothermal, industrial waste heat, and biomass-gasification. The technology being completely waterless has the potential to be carbon neutral when paired with a renewable heat source. sCO2 power blocks can be completely indigenized without need for any dependence on import material or parts. The sCO2 laboratory at IISc closely collaborates with Indian industries to ensure that the technology once proven can be quickly commercialized. The laboratory has successfully developed and commissioned India’s first tCO2 cooling system for the Indian Navy.
The sCO2 test loop was developed with funding from IISc and DST under the Indo-US Joint Clean Energy Research and Development Centre (JCERDC) programme.
Salient Features/Advantages
The closed cycle sCO2 test loop uses electrical heat for ensuring stable experimental conditions. The loop has provision to be coupled to multiple heat sources such as bio/synthetic gas or heat from a concentrated solar receiver. The loop uses state of art hardware such as Printed Circuit Heat Exchangers (PCHE’s) for recuperator and gas coolers, a variable speed high efficiency dry cooler for waterless operation.
Key Outcomes
The sCO2 has been operational since 2017 and is used to help the Indian industries address technology gaps to enable commercialization of sCO2 technology. The loop is highly instrumented to simulate a variety of operating conditions and test the performance of individual components.
IP Protection details
- Patent filed (Title, national/International): “Supercritical Carbon Dioxide based Waste Heat Recovery Cycle: PCT 202141050679. Dated: 4th November 2021, (Indian Patent)”, “Supercritical Carbon Dioxide based Waste Heat Recovery Cycle: PCT 202241044376 3rd August 2022, (Indian Patent)”, and “Compact Heat Engines for Waste Heat Recovery (PCT/IB2022/061857 Dated: 7th December 2022) (International IP Filed)”.
- Patents Granted: “Novel Cycles for Waste Heat Recovery Applications (PCT Application 201941013175 Dated: 01st April 2019 (Indian Patent)”, and “Compact Heat Engines for Waste Heat Recovery (Appl No. 202141058366A Dated: 15th December 2021) Patent Granted 16th June 2023 (Indian Patent)”.
- Copyrights obtained /progress on commercialisation /Pl. specify connect with industry: MoU has been signed with Triveni Turbines for Scaleup and Commercialization, and Indian Navy for ship applications for cooling and power generation.
Contact details (for more information)
- Nodal Person name: Pramod Kumar
- Email ID: pramod@iisc.ac.in
- Organisation name (Relevant link/web page): https://mecheng.iisc.ac.in/~pramod/
Supporting Photographs/Images

Organizations involved in the development (logo/name) Indian Institute of Science, Bengaluru, India Department of Science and Technology, N. Delhi India |