Combustion of fossil fuels for the heating, cooling and electricity needs of a large factory produces substantial emissions and detrimental impact on the environment. Harnessing thermal energy from the Sun may soon be a cost-effective alternative.
EU-funded scientists are investigating the potential of a cost-effective
concentrating solar power (CSP) system to meet industrial needs within
the context of the project 'Fresnel for solar heat with new receiver and
geometry' (FRESH NRG
). Target specifications are operation up to 250 degrees Celsius and collector efficiency greater than 50 %.
The linear Fresnel collector (LFC) is similar to the parabolic
trough, the most mature solar collector. Both rely on mirrors to focus
the Sun's light, but the LFC employs many small mirrors rather than a
few larger ones. Scientists are advancing the state of the solar
receiver, the LFC geometry and the mirror panels, and developing modular
plug-in designs to simplify transport and installation.
New receiver coating technology will fill a current gap for
medium-temperature applications. In addition, FRESH NRG is developing an
unprecedented lean manufacturing system including coating equipment,
receiver assembly and mirror production that will be co-located to
reduce manufacturing and prototyping costs.
Activities in the first reporting period witnessed intensive
development of the receiver and collector tube. The receiver collects
CSP from the primary Fresnel reflectors and uses it to heat water in the
collector tube. Development of the anti-reflective coating for the
receiver tube proved quite challenging, but is close to final
objectives. It will be an important contribution and is expected to lead
to a patent application.
The receiver design turns out to be compatible with commercially
available CSP receiver tubes. This means the same collector can be used
in the original concept, but also with CSP-type tubes for applications
greater than 250 degrees Celsius. Now, meeting collector performance and
cost targets are easily within reach.
FRESH NRG technology for low-cost solar heating targeted at
industrial heating, cooling and electricity needs is well on the road to
laboratory and field testing. Achieving targeted efficiency and
performance at a reasonable cost will provide major incentive to
numerous industries to invest in the technology. Widespread market
uptake will have important benefits for manufacturers, industry and the