Pan European Networks - Government - page 212

Pan European Networks: Government
ccording to the Renewable Heating and Cooling European
Technology Platform,
around 50% of the energy
consumption in Europe is due to heating and cooling
used for domestic, tertiary and industrial purposes. Looking at the
industrial and commercial sector, two-thirds of the final energy
consumption is spent on heating applications. However, although
the potential is very big, in the industrial and tertiary sector, the
active use of solar heat is so far not very common.
The potential analysis for solar heat in industrial processes
within Task 33 of the IEA
showed that in most industrial
processes, low and medium temperature is needed: more than
60% of the industry uses process heat with temperatures below
250°C. For solar systems, the integration in the supply level
structure is the easiest way and makes the performance of the
solar system independent of process technology changes.
However, many industries use steam networks for their heat
supply, which are operated at temperature levels in the range of
120°C–250°C although many of the connected processes only
need temperatures between 40°C and 80°C. This makes it
difficult for non-concentrating collectors to connect to these
heat supply networks.
Therefore, solar system integration directly into the process
level is often the only option but has stronger impact on the
production process.
The main problem faced by engineers when dealing with large
solar thermal collectors fields delivering heat to industrial
processes is that a reliable performance of the production
process is still much more important for the manufacturers
than energy savings reached. As a consequence, only proven
and standardised solutions are considered with payback times
not longer than three to five years. Apart from the cost issue,
which changes with varying energy prices and the
industrialisation of the production process of the collectors, the
reliability of the technology needs to be largely demonstrated.
This will help to establish solar process heat systems as
standard solutions as they are in the residential sector for
domestic hot water production.
As one important step towards this goal, within the European
Union FP7 project Industrial Process Heat by Solar Collectors
(InSun), three different types of large collector systems, each with
a peak power of more than 1MW, are applied to different
industrial processes and compared:
– improved flat plate collector system of SOLID for
feed water pre-heating of a steam boiler up to 95°C installed
at the Austrian meat and ham producer BERGER. Expected
savings: 298 tonnes per year;
– tracked concentrating Fresnel collectors of
SOLTIGUA at the Italian brick factory Laterizi Gambettola SRL,
1,056m² with indirect (thermal oil circuit) and 1,584m
direct steam generation at 180°C. Expected CO
savings: 340
tonnes per year; and
- parabolic trough collectors of SOLERA with indirect
(thermal oil circuit) steam generation at 195°C for a milk
powder production of the goat milk producing diary Lacteas
Cobreros in Spain. Expected CO
savings: 290 tonnes per year.
Each of these applications offers a high replication potential.
Solar heat for industry
The EU FP7 project InSun demonstrates large scale solar process heat systems
for different industrial applications and temperature levels, as co-ordinator
Dr Dirk Pietruschka explains
Solar storage installation at BERGER, Austria
Flat plate collector system of SOLID at BERGER, Austria
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