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Solar glass installation greenlit in Western Australia

Image Credits: ClearVue, Press Release

A Western Australia-based solar glass developer has begun installing the company’s transparent solar PV integrated glass units (IGU) on-site at the $7.45m grains research precinct at Perth’s Murdoch University. The greenhouse will utilise the company’s transparent solar glass technology which is designed to preserve glass transparency while generating electricity.

Data supplied by the company indicates the technology delivers a minimum of 30 watts per sqm while maintaining 70% transparency. The IGUs feature solar PV cells around the edges of each unit. The units incorporate a nanoparticle interlayer and spectral-selective coating on the rear external surface which allow much of the light to pass through but redirects infrared and UV light to the edge of the IGU where it is harvested by solar cells.

The company’s CEO stated that the company expects the greenhouse, when operational, will generate greater market awareness of its building-integrated PV (BIPV) technology. They are starting to see strong interest globally for the firm’s product from greenhouse suppliers, growers and other protected cropping end-users, he said. They expect the fully constructed greenhouse to lead to even greater market awareness of the technology and product.

The main construction of the supporting greenhouse structure was completed in December 2020 and the installation of glazing is expected to be finished within the coming weeks ahead of commissioning with plant trials due to start in March or April 2021.

The greenhouse is being built adjacent to two recently completed polycarbonate research greenhouses that form part of a larger research precinct. The project is the first commercial-scale demonstration of the company’s PV IGU technology in a protected-cropping agriculture setting and the company is confident it will perform well.

The solar glass developer’s datasheet indicates traditional greenhouses experience a temperature range of +/-6° from optimum temperature while its technology delivers a temperature range of +/-2° from the optimum temperature, providing an increased growth rate of up to 20-30%.

The CEO stated that the company looks forward to updating the market once the greenhouse is commissioned in the next few months, and as the larger research aspects of the project progresses.

When work began on the greenhouse in December, the CEO noted that the project marked a “major milestone for the company”. The trial results would not only help facilitate the commercial application of the technology across protected-cropping agriculture markets but also across high-rise commercial buildings.

While BIPV is yet to enjoy the same widespread deployment as building-applied PV (BAPV), it has been identified by the Australian PV Institute (APVI) as one of five key avenues for increased market penetration of PV. The APVI said the multi-functionality of BIPV meant it had huge potential.

More on the transparent solar glass technology

According to another article, the company’s proprietary transparent luminescent solar concentrator is a spectrally selective polyvinyl butyral interlayer sandwiched between two panes of glass. Most visible light is transmitted through the glass, but infrared light is deflected by inorganic particles in the interlayer to solar cells in the frame. UV light is converted to infrared and also deflected to cells on the window perimeter via total internal reflection.

A luminescent solar concentrator (LSC) is made from plastic or glass with fluorescent materials or quantum dots in or on it. The hope for the LSC is that cheap dyes or phosphors can make the system inexpensive as well as tolerant of defects or angle.

The luminescent ingredients can be dialled-in to absorb and re-emit at selected wavelengths. Luminophores used in LSCs can be quantum dots, rare-earth ions, nanoclusters and organic molecules. There has been a recent move away from organic dyes towards more stable inorganic phosphors.

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