Three tons of wax. A 4-story office building made almost entirely of wood. And putting CO2 to work instead of letting it heat up the planet: Scientists and engineers across the globe are harnessing unlikely materials to cut greenhouse gas emissions.

Today's show looks at how a zero-emissions office building combines integrated solar panels, heat pumps and a huge vat of wax to heat and power the structure, with enough left over to sell. We'll also look at highly efficient heat pumps using CO2 as the stuff inside that makes it work. They're spreading worldwide, and can be found everywhere from inside your Volkswagen ID electric car to the Large Hadron Collider. And also — at a hotel in Hell, Norway, where electricity use was cut by 70 per cent — without making a pact with the devil!

Our guests on today's show are Tore Kvande and Armin Hafner.

There's a video on Professor Hafner's work at CERN here, and more about CoolCERN, here.

Find a related podcast episode here.

Read more:

• Nocente, A, Time, B, Mathisen, H.M, Kvande, T & Gustavsen, A: The ZEB Laboratory: the development of a research tool for future climate adapted zero emission buildings. 8th International Building Physics Conference. J. Phys.: Conf. Ser. 2021, Vol 2069, Article no. 012109
• Sevault A., Næss E., Active latent heat storage using biowax in a central heating system of a ZEB living lab; Proc. of the 14th IIR-Gustav Lorentzen Conf. on Natural Refrigerants - GL2020. Internat. Inst. of Refrig. 2020 ISBN 978-2-36215-040-1. s.493-498, doi.org/10.18462/iir.gl.2020.1146 (Published online 7 December 2020)
• Pardiñas, Ángel Á.; Jokiel, Michael; Schlemminger, Christian; Selvnes, Håkon; Hafner, Armin. (2021) Modeling of a CO2‐based integrated refrigeration system for supermarkets. Energies. vol. 14:6926 (21).
• Barroca, Pierre, Armin Hafner, Bart Verlaat, Paolo Petagna, Wojciech Hulek, Lukasz Zwalinski, Pierre Hanf, Michele Battistin, Loic Davoine, and Daniella Teixeira. 2021. "An Ultra-Low Temperature Transcritical R744 Refrigeration System for Future Detectors at CERN LHC" Applied Sciences 11, no. 16: 7399. https://doi.org/10.3390/app11167399

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