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Enapter Challenge: Design for impact – A Green Hydrogen Future!

In order to stave off climate change, we need to decarbonize all energy vectors. Electricity from renewable sources by itself can go a long way, but not everything can be electrified and many applications will continue to rely on fuels and gases. Here, the energy carrier hydrogen presents a viable way forward, as it can be produced from just renewable electricity and water. Hydrogen is the fuel with the highest energy density by weight. It is a true multi talent and there exist many ways to make its energy usable. The green hydrogen is essential for the decarbonization of the energy world.


We are challenging you to build the hydrogen future with Enapter. The goal for this challenge is to design creative devices and systems for hydrogen applications that will power a green energy future.

What you can do:

We are making decentralized green hydrogen production really cheap. This provides an alternative to fossil fuels. It will also give rise to new applications based on the use of green hydrogen. To build this future with us, we invite you to contribute with your talents and skills. It is the time to show the world what you can do!

Design an innovative device or system that uses the energy carrier. Go crazy and know no borders whether you are designing innovative cooking stoves, new mobility concepts, extreme sport applications, energy storage systems or whatever else. The world is your oyster!

You can also engineer any auxiliaries for hydrogen-based systems, e.g. hydrogen compressors, hydrogen storage solutions, and hydrogen drying and purification systems. Your design might be the next breakthrough in hydrogen technologies.

You can also illustrate any future scenarios where hydrogen fully replaced fossil fuels and became the primary energy source of our life. Imagine a camping site, sporting equipment, long-range drones, or race cars entirely powered by hydrogen…

Let your creativity lead us to the future of hydrogen.
The finalists are invited to present their designs at Enapter’s Generation Hydrogen event on May 19th, 2021. The winner will be announced at the event.

The Green Hydrogen cycle:

Green hydrogen is produced via water electrolysis using renewable power sources. The anion exchange membrane (AEM) electrolyser can generate 500 NL of hydrogen gas per hour by splitting water molecules into hydrogen and oxygen with an electrical power input of 2.4 kW. This endothermic reaction can store the electrical energy in hydrogen in the form of chemical bonds. What can you do with the green hydrogen produced via electrolysis? One of the most important ways to utilize green hydrogen is to subsequently release the renewable energy. This requires an exothermic reaction of the hydrogen-oxygen combination. The process can be carried out in a hydrogen burner or a hydrogen fuel cell.

A hydrogen burner can produce heat via direct or catalytic combustion with water as the only by-product. Hydrogen and oxygen are fed into the burner separately, where the combustion reaction is initiated by ignition or catalysts. The generated heat can be used directly for cooking, residential heating, etc. It can also be converted to mechanical energy by driving a hydrogen steam engine.

Fuel cells sandwich negative and positive electrodes around an electrolyte solution. In hydrogen fuel cells, a catalyst at the negative electrode separates hydrogen molecules into protons and electrons. The electrons take an external route to the positive electrode, creating electricity flow, and reunite with the protons (and oxygen) to produce hydrogen fuel cells’ only other emissions: water and heat. In this way, the fuel cell can provide electricity to the external devices.

Hydrogen is an ideal power source for heat or electricity in your designs.

Most characteristic hydrogen applications

[long-term energy storage] Hydrogen fuel cells are often used to replace diesel generators for zero-carbon electricity. It also has the additional advantage of long-term energy storage, whereas diesel has an expiration time of only 6-12 months.

[on-site production] Hydrogen can be simply produced from water and renewable energy (e.g. wind, solar, tidal power). The AEM electrolyser can even be fed with rainwater. Hydrogen is ideal for applications at remote locations where transport of fuels is extremely limited.

[high energy density] 1kg of hydrogen contains 39.8 kWh (higher heating value) of energy. The high energy/weight density makes hydrogen a highly efficient fuel material for aviation and other applications, where the fuel weight should be reduced to the minimum.

[quick refill] Compared to batteries, hydrogen can be refilled more quickly. Considering the high energy density of hydrogen, the energy per refill gives hydrogen a better advantage over batteries for long-distance mobility and similar fields.

Here are some examples of existing hydrogen applications to get your creativity started!
Hydrogen BBQ grill: https://www.youtube.com/watch?v=AMPKuRQrR9o

Hydrogen internal combustion engine: https://www.keyou.de/technology/?lang=en

Hydrogen snow mobile: https://www.rotax.com/en/news/latest/detail/rotax-lynx-hysnow-hinterstoder-kopie.html

Hydrogen battery system: https://lavo.com.au/lavo-hydrogen-battery/

Hydrogen-powered camping: https://meethydrogen.com/aurorahuts-igloo-houseboats-now-with-hydrogen-fuel-cells/

Hydrogen aircraft: https://www.enapter.com/use-cases/hydrogen-aircrafts-zero-avia

Hydrogen long-range drone: https://www.hes.sg/hycopter

Hydrogen race car: https://www.thaiger.hochschule-stralsund.de/en/

Please find more information on green hydrogen application here: https://www.enapter.com/green-hydrogen-choose-your-application

We recommend using the CAD model of Enapter AEM electrolyser text when your design involves a hydrogen generator. You could easily find all technical specifications inthe AEM electrolyser datasheets.

The working principle of the AEM electrolyser can be found here: https://www.enapter.com/aem-water-electrolysis-how-it-works


  • Judging criteria

    The designs will be judged on their originality and creativity. The concept will be evaluated as well as the execution of the design.
    The design should maximize the advantages of hydrogen, e.g. high energy density, quick refueling, on-site production.
    Designs with more detailed information and technical specifications are favored.
    You will gain bonus points when your design takes feasibility, manufacturability, and cost-effectiveness into consideration.

  • Specifications for file submission
    Model file format: models should be submitted in .stp or .igs formats and as 3D-pdf file.

    Images of the design from FRONT, SIDE and TOP views should be included in your submission.

    Renderings: photo-realistic renderings can earn bonus points from the jury.
    Please provide a short description of the device and rationale of the design in a PDF file.

    If the files are zipped, the file compression should be compatible with Windows 10 and should not require any special software to unzip.



    If you think an entry may infringe on existing copyrighted materials, please email challenges@grabcad.com.

    By entering the Challenge you:

      1) Accept the official GrabCAD Challenges Terms & Conditions.
      2) Agree to be bound by the decisions of the judges (Jury).
      3) Warrant that you are eligible to participate.
      4) Warrant that the submission is your original work. Warrant, to the best of your knowledge, your work is not, and has not been in production or otherwise previously published or exhibited.
      5) Warrant neither the work nor its use infringes the intellectual property rights (whether a patent, utility model, functional design right, aesthetic design right, trademark, copyright or any other intellectual property right) of any other person.
      6) Warrant participation shall not constitute employment, assignment or offer of employment or assignment.
      7) Are not entitled to any compensation or reimbursement for any costs.
      8) Agree the Sponsor and GrabCAD have the right to promote all entries.


    Only entries uploaded to GrabCAD through the "Submit entry" button on this Challenge page will be considered an entry. Only public entries are eligible. We encourage teams to use GrabCAD Workbench for developing their entries. Entries are automatically given the tag "EnapterChallengeGreen2021" when uploading to GrabCAD. Please do not edit or delete this tag. Only entries with valid tag will participate in the Challenge.


    The sum of the Awards is the total gross amount of the reward. The awarded participant is solely liable for the payment of all taxes, duties, and other similar measures if imposed on the reward pursuant to the legislation of the country of his/her residence, domicile, citizenship, workplace, or any other criterion of similar nature. Only 1 award per person. Prizes may not be transferred or exchanged. All winners will be contacted by the GrabCAD staff to get their contact information and any other information needed to get the prize to them. Payment of cash awards is made through GrabCAD, All team awards will be transferred to the member who entered the Challenge.

    If you have any questions regarding awarding your prizes please message Kesa at Kesa@GrabCAD.com or Joz at Jocelyn@GrabCAD.com.

  • We will release the finalists before the announcement of the winners to give the Community an opportunity to share their favorites in the comments, discuss concerns, and allow time for any testing or analysis by the Jury. The Jury will take the feedback into consideration when picking the winners.

    Winning designs will be chosen based on the Rules and Requirements.

  • Schedule

    This Challenge ends on April 22nd, 2021 (23:59 EST.) Finalists Annouced on May 5th, 2021 Winners will be announced on May 19th, 2021 at the Generation Hydrogen event.


$3000 in Prizes

First Place


Second Place


Third Place


Fourth Place


About Enapter

Enapter designs and manufactures highly efficient hydrogen generators. The core technology is built on unique and patented Anion Exchange Membrane (AEM) electrolysis. Our vision is to pave the way for clean energy by replacing fossil fuels with green hydrogen and making it accessible.

Find out more about Enapter here: https://www.enapter.com/

Generation Hydrogen, May 2021, is an online event zeroing in on trailblazing hydrogen technology. We will bring the brightest minds in hydrogen together: students, experts, and all those fighting climate change with green hydrogen (including the Enapter team). Expect more than the average exhibition or academic conference. It’s the active rendezvous for anyone passionate about hydrogen to dive deep into tech. We are keen to meet those as fervent for hydrogen as we are, to develop new technologies and partnerships. Generation Hydrogen is the place to show the world how hydrogen innovations will impact our lives.

Find out more about the Generation Hydrogen event here: https://www.generationhydrogen.com/


  • A D

    A D 9 days ago

    :D :D :D :D :D

    A D has uploaded 56 CAD models & has left 2 comments.
  • Riccardo Rabotti

    Riccardo Rabotti 5 days ago

    I would like to ask for information.
    Is it possible to deliver the project in .stl format?
    I'm currently working on Blender in order to design the model and render the scene.
    The project will be submitted in .stl format with PDF attachments.

    Riccardo Rabotti has uploaded 5 CAD models & has left 4 comments.
  • Jingwen Wang

    Jingwen Wang 5 days ago

    @Riccardo Rabotti, thank you for your comment. We may not be able to visualize some features with the .stl format, but we can try anyway. If you can also provide some additional documentation to show your work, it should be enough.
    We are looking forward to seeing your design!

    Jingwen Wang has uploaded 0 CAD models & has left 7 comments.
  • Deniz Aksoy

    Deniz Aksoy about 17 hours ago

    Sir the question of mine is what topic we should focus on. Usage of hydrogen with Enapter's device produced or design a system that can maintain itself with Enapter devices while using solar or wind electricity and producing hydrogen or finding new area that hydrogen can be used. I think it is not clear enough

    Deniz Aksoy has uploaded 0 CAD models & has left 3 comments.
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