As a consultant (PhD, UCT, 2004; MSc, Glasgow, 1990) retired from corporate employment but still actively engaged in research and advisory work, I’m revisiting my 1988/89 Transwall experiments—an early passive solar wall system that cut heating energy use by 28% and raised indoor temperatures by 3–4°C in cold climates. Back then, we tested these transparent, water-filled wall modules at the University of Glasgow with encouraging results.

With South Africa’s persistent energy challenges and high solar availability (Pretoria sees over 2,300 sunshine hours annually), I believe this low-tech, cost-effective solution is worth re-examining. Transwalls align with SANS 204 energy-efficiency standards and could significantly reduce electricity demand in homes—but they need redesigning to handle our local climates without overheating.

I’m now integrating this concept with modern tools like AI, infrared thermography, and CFD modelling to adapt Transwalls for South African conditions. I’d value your thoughts:

·        Could something like this work in your home or community?

·        What practical challenges—materials, installation, cost—should we anticipate?

·        Are you aware of similar efforts or local passive solar innovations?

Whether you’re a solar hobbyist, installer, or researcher, your input can help shape a modernised version of this forgotten innovation. Let’s explore how Transwalls might contribute to a more sustainable and affordable energy future.

Feel free to comment below or message me directly if you're interested in testing, collaborating, or sharing insights.

Perhaps you should start the ball rolling by explaining what a transwall is, and the principles that would make it work - the old Transvaal worked very well, but I'm sure that's not what you have in mind 😄

This is South Africa ..... the infrastructure grow feet overnight and vanish 😉

If a Transwall is a wall, wouldn't you first focus on getting a home air tight, then ceiling insulation, then window insulation?

9 hours ago, frivan said:

If a Transwall is a wall, wouldn't you first focus on getting a home air tight, then ceiling insulation, then window insulation?

Yes, but... a wall is not a house if they choose to identify as a wall😉

Edited July 6Jul 6 by HennieL