In this systems production of both electricity and hot water is done simultaneously. In PV modules, as the module temperature increases, the efficiency of the module drops down. In hybrid modules, the module heat is
absorbed in order to produce hot water. In this way, PV efficiency is optimized
as the heat is transferred into water for hot water production.
Corp.has launched its Volther hybrid photovoltaic-solar thermal collector, which
produces electricity and hot water simultaneously. The hybrid system allows
extra module heat to be absorbed to produce hot water while optimising
efficiency, the company says.
Historically, the main drawback of many
conventional photovoltaic (PV) systems has been the high initial cost and
limited amount of electrical output compared to the solar input. This new system
allows excess heat to be recaptured and boosts the system's return on investment
(ROI), announces Solimpeks.
Any PV cell is negatively affected by heat,
with output dropping by around 0.5 % for every Kelvin degree. A 10-degree rising
in temperature, for example, would mean a loss in power output of about 5%.
Scientists at Solimpeks have turned this problem into a solution by developing
its “PV-T”: a hybrid PV and solar thermal collector, which enables the PV cells
to be cooled using water circulating around them. The result, greater electrical
output from the cells and the production of hot water.
As well as
increasing PV module performance, the PV-T hybrid collectors mean that less roof
space is required for the same output of electricity and hot water, since only
one system is needed as opposed to a solar thermal array and PV array
side-by-side. Furthermore, Solimpeks reports that the hybrid PV-T system’s ROI
is shorter than the PV systems, and because PV cell temperature is reduced, the
lifetime of cells is lengthened.
According to the Turkish company,
calculations by several scientific organisation and universities show that an
average family house in northern Europe would require only 25 square-metres of
PV-T collectors to meet its hot water and electricity demands.www.solimpeks.com