Dr. ir. Joustra, J.J.

Jelle Joustra is an Assistant Professor in creating fully circular product and materials at the Faculty of Industrial Design Engineering.

Academic Background

Jelle Joustra did his bachelor Industrial Design Engineering at TU Delft, in which one of the design projects resulted in building a test setup to measure the thermal conductivity of plastics. After the bachelor, he participated in the Nuon Solar Team, to design, build and race the solar car Nuna5 in the World Solar Challenge in Australia and the Suzuka Dream Cup in Japan.

In his master Integrated Product Design at TU Delft, he was awarded the Philips Design Award for the domestic appliances project: Coffee! 

For his graduation project he developed a new set of sailing gear for Olympic dinghy sailors, optimised for thermal comfort during a race. The project was awarded the International Sports Engineering Association Student Prize.

After his graduation from TU Delft, Jelle worked as Product Developer at Hukseflux Thermal Sensors. His tasks included the design, testing and preparation of new products for series production. He designed several types of sensors for measurement of heat flux, thermal conductivity and solar radiation.

He completed his PhD at Circular Product Design, in the department of Sustainable Design Engineering. The PhD research was embedded in the European project “EcoBulk”, a large scale demonstration effort to complete a full cycle with composite materials in the circular economy. Jelle contributed by researching new reuse pathways and design strategies.

Currently, Jelle works as assistant professor on creating fully circular products and materials at the Design for Sustainability research group. His research and design projects have a special focus on the assembly of products at the macro (product architecture) as well as microscale (materials composition).


  • 2017 – 2022
    PhD Circular Product Design, TU Delft
  • 2008 – 2012
    Master Integrated Product Design, TU Delft
  • 2004 – 2008
    Bachelor Industrial Design Engineering, TU Delft


  • 2022 – 2023
    Postdoc Design for Sustainability, TU Delft
  • 2012 – 2017
    Product Developer, Hukseflux Thermal Sensors, Delft
    Design, prototype development, testing and implementation into series production of thermal sensors. In particular the development of solar radiation sensors (pyranometers)
  • 2011 – 2012
    Graduation project " Thermal optimisation of competitive sailing gear", Magic Marine, SailingLab, TUDelft
  • 2008 – 2009
    Production & sensor systems, Nuon Solar Team, TU Delft

Specialisation/Field of research

  • Use of composite materials in Circular Product Design

Involved in the research project(s):


Circular Composites

A design guide for products containing composite materials in a circular economy

TU Delft

Published in 2022

Offshore wind farm decommissioning

An orientation of possible economic activity in the South Holland region and the Rotterdam port area

Research report, TNO and TU Delft

Published in 2020

Media coverage: