Description

Postdoc in designing a novel heat exchanger with thermoelectrics for the green transition

At DTU Energy we are looking for a postdoc to work on modeling and designing a novel type of heat exchanger equipped with thermoelectric generators, to recover and convert waste heat from the green transition to useful electricity. We specifically target waste heat from electrolysis and partner with several industrial partners who will use novel thermoelectric generators to bring this exciting technology to market.

Thermoelectric elements are devices that are able to partially convert a heat flow into an electrical current using the Seebeck effect. These so-called thermoelectric generators (TEGs) have no moving parts and are thus ideal for converting e.g. waste heat into electricity. In this project, we are specifically focusing on waste heat generated by electrolysis, which is central to Denmark’s green energy strategy, enabling conversion of renewable energy – mainly from offshore wind – into green hydrogen for hard-to-electrify sectors. However, up to 40% of the input electricity in electrolysis is lost as waste heat limiting efficiency. In this project we will research a novel cost-effective solution to this problem by integrating innovative, non-Tellurium(Te) thermoelectric generators into heat exchangers to convert waste heat from electrolysis into electricity.

Involved in the project, which is funded by Innovation Fund Denmark, are key academics with expertise on electrolysis (SDU) as well as Danish manufacturers of both heat exchangers (Danfoss) and thermoelectric generators (TEGnology). The goal of the project is to realize an actual prototype heat exchanger that can be tested along an electrolysis system. Within this consortium, the main role of DTU will be on researching how to design an ideal TEG for the heat exchanger system, collaborating closely with the other partners on thermoelectric material properties and design constraints. A key part of the position is a close collaboration with Danfoss on combining TEGs with heat exchanger design. We will approach the design questions using a computational approach to simulate the performance of thermoelectric generators, and subsequently use the model to dimension and design the thermoelectric elements for the heat exchanger.

Responsibilities and qualifications

For this modeling project, we are looking for a postdoc to realize and improve our model for thermoelectric generators as well as perform the design optimization and dimensioning, in close collaboration with the other partners. We will use Comsol Multiphysics for the modeling of the thermoelectric elements, integrating these results into a hybrid model in Dymola to simulate full system performance. You will work closely with the project partners to determine design specifications and also after the prototype has been realized to compare model prediction with actual system performance. You will have the exciting opportunity of significantly advancing a technology that could be decisive for the green transition, improving the efficiency of electrolysis for the future energy system.

Qualified applicants must have:

• PhD degree in physics, astronomy, engineering, computer science or similar.
• Experience with finite element modeling, ideally Comsol Multiphysics.
• Experience with modeling thermoelectrics, heat transfer and electrical systems.
• Experience with writing and publishing scientific articles.
• Ability to work independently, to plan and carry out complicated tasks. 
• Good communication skills in English, both written and spoken.

As a formal qualification, you must hold a PhD degree (or equivalent). 

We offer
DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility. 

Salary and terms of employment 
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed upon with the relevant union.

The period of employment is 3 years. Starting date is 1 May 2026 or according to mutual agreement.

You can read more about career paths at DTU here.

Further information 
Further information may be obtained from Professor Rasmus Bjørk, +45 46 77 58 95, rabj@dtu.dk. 

You can read more about DTU Energy at www.energy.dtu.dk.

If you are applying from abroad, you may find useful information on working in Denmark and at DTU at DTU – Moving to Denmark.

Application procedure 
Your complete online application must be submitted no later than 22 March 2026 (23:59 Danish time). 

Apply at: Postdoc in designing a novel heat exchanger with thermoelectrics for the green transition

Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link "Apply now", fill out the online application form, and attach all your materials in English in one PDF file. The file must include:

• Application (cover letter)
• CV
• Academic Diplomas (MSc/PhD – in English)
• List of publications 

Applications received after the deadline will not be considered.

All interested candidates irrespective of age, gender, disability, race, religion or ethnic background are encouraged to apply. As DTU works with research in critical technology, which is subject to special rules for security and export control, open-source background checks may be conducted on qualified candidates for the position.

The Department of Energy Conversion and Storage (DTU Energy) focuses on research and development of functional materials, components, and systems for sustainable energy technologies. The technologies include fuel cells, electrolysis, power-to-x, batteries, and carbon capture. The research is based on strong competences on electrochemistry, atomic scale and multi-physics modelling, autonomous materials discovery, materials processing, and structural analyses. We also focus on educating engineering students at all levels, ranging from BSc, MSc, PhD to lifelong learning students. We have about 300 dedicated employees. Read more about us at www.energy.dtu.dk.

Technology for people
DTU develops technology for people. With our international elite research and study programmes, we are helping to create a better world and to solve the global challenges formulated in the UN’s 17 Sustainable Development Goals. Hans Christian Ørsted founded DTU in 1829 with a clear mission to develop and create value using science and engineering to benefit society. That mission lives on today. DTU has 13,500 students and 6,000 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. DTU has campuses in all parts of Denmark and in Greenland, and we collaborate with the best universities around the world.