This is the claim of a team led by engineers from Glasgow University whose design exploits the unique properties of microscale surfaces to create a high-performance heat exchanger.
Heat exchangers, which transfer thermal energy between fluids, are used in refrigeration, fuel cells and the types of internal combustion engines used in cars and aircrafts.
In a new paper published in Applied Thermal Engineering, the researchers describe how they developed and built the prototype system, which they estimate to be 50 per cent more effective than a market-leading conventional heat exchanger despite being one-tenth of its size.
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According to Glasgow University, the system’s effectiveness is attributed to the design of architected surfaces over which liquids flow through the exchanger. The cube-shaped exchanger draws water through a core studded with tiny holes arranged in a gyroid configuration.
The team chose to use a repeating gyroid architecture for their heat exchanger because the effectiveness of heat exchange is linked to its surface area.
Their microscale gyroid design, manufactured from a photopolymer using a sophisticated 3D printer, engineers a large surface area into a compact cube measuring 32.2mm on each side and weighing 8g.
By drawing water through this dense maze, the researchers were able to demonstrate temperature changes of between 10 and 20ºC when water flowed through their heat exchanger at a rate of between 100 and 270mm per minute.
The team measured the heat transfer coefficient of their new exchanger so they could determine how it performed against a series of differently-sized conventional heat exchangers made from materials including polymers and metals.
They found that the effectiveness of their new heat exchanger was 50 per cent more than a thermodynamically-equivalent, most-efficient, counter-flow heat exchanger even though their newly-developed prototype was 10 per cent of its size.
The research was led by Dr Shanmugam Kumar from Glasgow University’s James Watt School of Engineering, alongside colleagues from Swansea University and Khalifa University of Science and Technology in Abu Dhabi.
In a statement, Dr Kumar said: “We’ve been working to find new applications for this type of micro architected, 3D printed lattices for several years now. We have already demonstrated how they can be used for purposes including recyclable high-performance batteries and the development of future ‘smart’ medical devices like prosthetics and back braces.
“This latest paper shows that we can use these gyroid lattice architectures to create a material with a remarkably large surface area to volume ratio which lends itself very well to heat exchange.
“Being able to develop smaller, lighter, more efficient heat exchangers could help us develop refrigeration systems which require less power, for example, or high-performance engines which can be cooled more effectively. We’re keen to develop this technology further with future research.”
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Good comment. I think these reports are different from many others , in that they were prepared outside the government and the issues, they raised, of...