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Last week, we attended the Smart Window Technology Exchange Meeting and the Next-Generation Window-Type BIPV Technology Forum hosted by Korea Southern Power Company (KOSPO).
As building energy efficiency and Zero Energy Buildings (ZEB) have become increasingly important topics, this forum went beyond a simple technology introduction—it offered valuable insights into the future of building envelopes.
Government Policy Direction vs. Industry Reality
The first session covered government support policies for the BIPV industry.
An R&D investment plan of approximately KRW 75 billion and a strong commitment to market expansion were introduced, reflecting growing policy interest.
However, one key takeaway was that while the technology is already well-developed, institutional frameworks are still lagging behind.
In particular, the lack of clear integration of SCGC (Solar Heat Gain Coefficient) standards into domestic regulations appears to be a major bottleneck for the smart window industry.
Currently, Korea’s evaluation system is largely centered on U-value (thermal transmittance), which makes it difficult for technologies that actively control solar radiation to be properly recognized.
Compared to the U.S. IRA tax credit of 30%, there were suggestions that Korea also needs institutional incentives or tax benefits. This highlighted once again that beyond technological advancement, policy design plays a critical role in determining the success of an industry.
SPD-Based Smart Glass – Potential for Exterior Applications
One of the most interesting presentations focused on SPD (Suspended Particle Device)-based smart glass.
The company introduced itself as the only domestic manufacturer of SPD films, with the capability for exterior window applications—an especially notable point.
According to demonstration results, cooling energy consumption can be reduced by up to 47%.
This suggests that smart glass is not merely a “light-control window,” but a viable energy solution that reduces cooling loads.
Additionally, the price has significantly decreased—from around $700–$1,000 per square meter in the past to approximately $250 today—indicating that both technical and cost barriers have been substantially reduced.
However, once again, the key issue remains institutional recognition.
Without sufficient reflection of SHGC standards in building energy ratings, even technologies with proven energy-saving performance may struggle to be adopted during the design phase.
Slit-Type Silicon Window BIPV – Balancing Transparency and Power Generation
The next-generation window-type BIPV technology was also highly impressive.
This technology uses thinly sliced silicon cells arranged in a blind-like structure, targeting over 80% transparency and more than 10% power generation efficiency.
A key advantage is that it can be applied regardless of building orientation (east, west, south, or north) and features a series structure that is resilient to shading.
Unlike conventional solar modules, this approach allows the entire building façade to function as a power-generating surface, offering strong potential for integration with architectural design.
It challenges the traditional perception that windows are solely for daylighting.
Organic Solar Cell-Based Energy Windows – A Different Approach
Another noteworthy presentation came from the Korea Institute of Materials Science, introducing organic solar cell-based smart energy windows.
The data showed that these windows can maintain around 40% transparency while generating more than 50 kWh per square meter annually.
A particularly striking point was that approximately 45% of building energy loss occurs through windows.
This approach reframes windows from passive weak points into active building envelopes that simultaneously generate energy and control heat.
The potential for large-area production through roll-to-roll processes also highlighted strong scalability for commercialization.
Key Takeaways
The biggest realization from this forum was that building envelopes are no longer passive elements.
Smart windows and window-type BIPV are not just eco-friendly options—they are likely to become essential components in the era of Zero Energy Buildings.
That said, the critical question remains: how quickly can policies and markets keep pace with technological advancements?
If public institutions take the lead in expanding demonstration projects and incorporating new metrics into energy rating systems, market adoption could accelerate significantly.
This forum was more than just an opportunity to gain information—
it was a meaningful moment to envision a future where “windows generate energy.”
It will be interesting to see how real-world applications continue to evolve in the coming years.