building integrated photovoltaics

Danish BIPV specialist Dansk Solenergi has added two more tiles to its product range – an 18.15%-efficient dark grey panel and a 16.7%-efficient terracotta product. Both panels have an operating temperature coefficient of -0.34% per degree Celsius.

Scientists in Spain have designed a BIPV forced ventilated facade that can be used as support for heating and a domestic hot water (DHW) building system based on air source heat pumps (ASHPs). In the proposed system configuration, the heat pump is expected to cover building heating demand at all times, regardless of the performance of the solar array.

Conceived by researchers in Estonia, the device is claimed to be compatible with both crystalline silicon and thin-film BIPV panels and to manage, easily, different voltage levels. It can be applied either in solar facades or BIPV rooftop arrays.

Scientists in Australia have developed an optimization framework for building-integrated photovoltaics that allows the selection of design variables according to user preferences. Their model considers PV-related features such as tilt angle, window-to-wall ratio (WWR), PV placement, and PV product type, as well as objective functions and constraints such as the net present value and the payback period.

HyET Solar and the Delft University of Technology are developing a photovoltaic foil technology that is claimed to be suitable for any type of surface. The solar foil has a 12.0% conversion efficiency and is based on hydrogenated amorphous silicon and nanocrystalline silicon in a tandem cell configuration.

The 5.5%-efficient cell was fabricated through a low-temperature, two-step manufacturing process that is compatible with existing window glass manufacturing technology. Cells made with 70nm antimony trisulfide films achieved the best fill factor of around 57%, while the highest power conversion efficiencies were achieved with films ranging from 70 to 100nm.

Dutch researchers have used optic colored filters to make building-integrated PV products more suitable for urban environments with cultural heritage value. They discovered that the filters do not affect a cell’s open-circuit voltage and fill factor, but only the short-circuit current.

A 605 kW array installed on the roof of the port’s largest building helps prove the claim made by Stockholm Norvik that all of its structures are able to host rooftop solar.

Architects and construction companies are being offered an ever-growing array of Building Integrated Photovoltaics (BIPV) products, with their needs for safety, speed of construction, and aesthetics in mind. But can it drag BIPV beyond niche status?

Developed by a German group of scientists, the panels are considered an ideal solution for aesthetically demanding applications in buildings with stone facades. Although their power yield is more than halved compared to conventional modules, the modules can also be used as partial shading walls or semi-transparent roof elements.