Preparing heat-pump design for upscaling production

In the fight against global warming, people are continuously looking for sustainable alternatives for central heating systems. Heat pumps offer an ideal solution by reducing reliance on fossil fuels like natural gas and lowering monthly gas bills for households amid soaring costs.

Over the past decades, countless initiatives have been raised in the global quest to a more sustainable lifestyle of the world population and the preservation of nature. An essential percentage of greenhouse gas emissions, that rapidly increase global warming, stem from central heating systems in households. Therefore, governments take steps towards planning and implementing modern, clean – hence sustainable, heating infrastructures. One of the solutions for cleaner heating of buildings is a heat pump. By extracting heat from the environment and redirecting it, these pumps constitute one of the most eco-friendly central heating systems in homes, shops, schools, and offices.

The SuperHybrid heat pump as developed by Cooll Sustainable Energy Solutions, an SME spin-off company of the University of Twente, is a rather unique example of this. This heat pump functions as a direct replacement of natural gas heating. Whereas conventional heat pumps device an electrical-mechanical compressor in the compression of the refrigerant, Cooll’s SuperHybrid uses a heat-driven adsorption compressor to this end. The SuperHybrid is powered by gas and extracts heat from the outside air, directly saving 30% on gas and CO2 emissions. With green gas or hydrogen applied as fuel, emissions can be reduced even further.

To meet the rapidly increasing demand, Cooll is working together with the FIP-AM@UT to make their product ready for an upscaled production. The heat pumps devise a thermal separation unit to separate the hot and cold pipes and prevent mixing. The current piping layout creates challenges when upscaling the production of the system, due to a complex geometry. This results in a relatively long and delicate manufacturing process. The goal of the project is to redesign this assembly by considering several manufacturing methods, material selection, and suitable joining techniques. The focus of this project will be more efficient production operations by simplifying the design, without affecting the performance of the heat pump.

Industry partner

APPROACH

In response to new legislative requirements, the project team, in collaboration with FIP-AM@UT, set out to enhance heat pump technology for scaled-up production. The focus was on reengineering the heat pump assembly to address complexities in the existing piping layout.

Advanced computational fluid dynamics (CFD) simulations were used to analyze energy loss, pressure drop, and thermal mass across various piping configurations. The team explored different layouts, paying special attention to flow stratification and natural convection to optimize performance and manufacturability.

A manufacturability assessment identified suitable production technologies, focusing on reducing complexity and cost while improving scalability. A prototype was built and tested to validate the redesigned heat pump’s efficiency.

This streamlined approach improved product performance and manufacturability for large-scale production, meeting the demand for sustainable heating solutions in line with new regulatory standards.

OUTCOME

The HEATS project successfully advanced heat pump designs, ensuring technical performance was not compromised while significantly simplifying the production process to allow for scalability. Utilising advanced computational fluid dynamics (CFD) simulations, the project developed designs that maintained operational efficiency and met regulatory standards with less complexity. A thorough evaluation of the process chain was conducted to assess its complexity, cost implications, and scalability potential, leading to further optimisations.

Key results include:

• Uncompromised technical performance with reduced design complexity
• Scalability achieved through streamlined production processes
• Enhanced cost-efficiency in manufacturing and assembly
• Optimised process chain for reduced complexity and lower costs
• Successful interdisciplinary collaboration yielding customised solutions

This project was made possible through the Regio Deal supported by the Province of Overijssel and the Dutch State.

FOR MORE INFORMATION ON HEATS, FEEL FREE TO REACH OUT TO

Celal Soyarslan

Celal Soyarslan

Senior Research Engineer

Sattar Emamian

Research Engineer

Tobias Claus Brandstätter

Research Fellow - Fraunhofer IPT