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SUSTAINABLE REVOLUTION PART 4 at Linköping University, report:

Further development of the Green Revolution Energy Converter
Investigating improved control method, sealing and overall performance of LabModel v3

Download the report: Further development of the Green Revolution Energy Converter

Report Summary


The Green Revolution Energy Converter (GREC) project focuses on developing a novel heat engine that converts waste heat into mechanical work, contributing to global efforts against climate change. This report presents the latest advancements in the GREC LabModel v3, focusing on improvements in control methods, sealing, and overall performance.

Key Objectives

  1. Identify and Seal Leakage: Ensuring the LabModel v3 is pressure-tight.
  2. Implement Power Measurement: Choosing and implementing a method to measure power output.
  3. User-Friendly Enhancements: Making the LabModel v3 easier to operate.

Major Improvements

  1. Control System: Integration of a Raspberry Pi for easier control of the stepper motor via a local website.
  2. Instruction Manual: Creation of a detailed manual to simplify future operations and maintenance.
  3. Testing: Conducted multiple tests to verify pressure integrity and power output.



The GREC LabModel v3 shows promising results in utilizing waste heat for energy conversion. The advancements made in this project provide a solid foundation for future development and scalability, highlighting GREC’s potential to contribute significantly to reducing carbon emissions.

Project Participants

• Candidate Group: Simon Eriksson, Erik Widström and Richard Zetterman
• Project Supervisor: Johan Hedbrant, Research Engineer
• Project Owner: Johan Renner, Assistant Professor
• Examiner: Jonas Detterfelt, Assistant Professor

Future Work

Future efforts will focus on:
• Scaling the model for industrial applications.
• Exploring advanced methods for power extraction.
• Continuing to improve the user interface and operational efficiency.

During spring 2024 a candidate group, Simon Eriksson, Erik Widström and Richard Zetterman, succesfully used the Linköping University GREC Lab-Model v.3 to convert heat transfer to kinetic energy in experiments.
The Linköping University own physical GREC LabModel v3 shows that a "real world" revolving physical "Work Generating Volume" behaves as predicted in earlier Li.U theoretical research. Theory and reality converges, the GREC is a crucial climate-positive concept for an adjustable clean energy generation.


One of the most pressing global issues facing humanity today is global warming. To help fight this problem, an innovative technology called GREC, Green Revolutionary Energy Converter, utilizes the wasted heat in industries to convert it to mechanical work, by rotating a shutter between a heated and cooled zone to create a pressure difference, which in turn can produce mechanical movement. This innovative technology is meant to be scaled and implemented in different applications, such as large industries to make use of excess heat energy.

Multiple previous projects have researched the GREC and developed a working model, the LabModel v3. The purpose of this project is to further develop the previous work that has been done on the GREC LabModel v3. The main objectives this report will bring up is to identify and seal possible leakage to ensure that the model is pressure tight and to choose and implement a method to measure the power output. Another objective was to make LabModel v3 more user-friendly.

The new control method was overseen first, where a Raspberry Pi was implemented to control the stepper motor more easily with the help of a local website on the microcomputer. This dictated how fast the rotating shutter in the LabModel v3 would rotate. A step-by-step instruction manual was also created to make future work easier and to make sure different people can operate the LabModel v3 with ease.

Multiple tests were conducted when the LabModel v3 was declared pressure tight, the purpose of the test is to prove that the LabModel v3 is repeatable and that the pressure inside GREC is the same in all parts of it. Furthermore, the power output was investigated using a reverse speaker and liquid column test.

The results show that the pressure difference created by the temperature difference between the hot- and cold side was sufficient to produce work. The power output that the LabModel v3 produce is not considered big but the results show a proof of concept. To scale the model and find improved ways of extracting the power output is for future work to investigate. This to further improve the chances of GREC being a part of industries to utilize waste heat and help decrease global warming.

Investor Information

The Green Revolution Energy Converter (GREC) is an innovative clean energy technology developed by nilsinside AB. Students at Linköping University has studied GREC based on well-established scientific principles from the mid-1800s, adapted into a new, effective "Low-Tech" concept. The project is now seeking investors to support the transition from theoretical and experimental models to practical, scalable applications. For further information and investment opportunities, please contact:
nilsinside AB, Nils Karlberg,, tel +33 608 53 15 93

The GREC Technology

In thermodynamic terms the GREC is a closed system with a moving boundary where the GREC converts heat energy to kinetic energy. The GREC heats up and cools down its internal large sliced WGV efficiently, fast and repetitively, resulting in internal pressure changes.
These internal pressure changes are used by its moving boundary to generate kinetic energy. You may think of the GREC as a revolving Carnot heat engine controlled by computer logics. Please find the theoretical presentation of the GREC on this link:
GREC Theory Presentation