Cleantech Demonstration Arena

– solar concentrators for

industrial heat and solar cooling

Concentrated solar energy :

the best choice in high irradiation regions

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Solar Energy to supply the

majority of the world’s energy

in the future (IEA)

Desertec - €400bn to be

invested, 15% of Europe's

electricity demand

Large regions of the

world has high

direct radiation

• DNI 5,0 – 7,5

kWh/m²/day

• Regional variations

• Local variations

Concentrated solar energy for

medium temperature generation

• A number of European companies

are developing solar concentrators

for rooftop or ground mounting

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Medium temperature – 16% of the

energy consumption in the industry

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100°C-200°C a major part of the European energy

consumption, in Austria 10 TWh.

Energy consumption at different temperatures at

industries in Austria (Zahler, Z. 2007)

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Medium Temperature Solar Concentrators:

Industrial Process Heat

• Chemical industry

• Food Industry (rice mill)

• Textile industry

• Steam production or

thermal oil

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Primary

pump

Solar Heat

200°C

Steam

Solar Concentrators: Solar Cooling

Double effect H2O/LiBr

•COP 1,1 – 1,4

•Temperature of cold: Cold

5°C – 20°C

•Driving temperature: 140°C

– 180°C

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Primary

pump

160°C 5°C

35°C

Fan

Solar

Cooling

Climate Well Solar Absorption Cooling 1 (3)

• Two chambers – reactor

with salt and evaporator

with water

• Low pressure – the

water start to boil at

room temperature!

• Like a wet towel, when

the water is evaporating,

it requires energy and

drops in temperature.

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Low pressure

Climate Well Solar Absorption Cooling 2 (3)

• As the water evaporate, the water container is becoming cold.

• The salt absorbing the water vapor is warm and need and the heat needs to be taken away e.g. to a swimming pool or pre-heating tap water.

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25° C 7° C

Low pressure

Climate Well Solar Absorption Cooling 3 (3)

• When the salt has

absorbed all water, it

need to be

recharged.

• This is done by using

the heat from the

solar collectors

• The water in the salt

is pushed back to the

evaporator and the

system is ready to

start cooling again.

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75° C

Low pressure

Solar Cooling at the Health Center

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CW10- Heat

- Cooling

- Storage

Cold tap water

X10- Solar Heat

- Electricity PV

Hot tap water

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Concentrated solar energy for

Photovoltaic / Thermal generation

• Concentrated light increase the electricity production of the solar cell.

• The solar concentrator produce both heat and electricity

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Inverter

230 V AC

TankPrimary

pump

Solar PV + Thermal system

The CPV/T Solar Concentrator

combines several functions:

+ +++

=

Solar Thermal PV Panel Solar Tracker Control system Stand

Solar Concentrator CPV/T installation

on a 50 room hotel in Pune

• 100 m2 CPV/T Solar Concentrators

• 5000 liter of 60°C hot water, enough to cover all hot water for showers, laundry, kitchen

• 10 kW of electricity to cover all lightning, TV, ventilation

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• 2 500 000 rs investment

• 4 years payback time

Marbella, Spain

Centro Forestal

Installation to provide a 60

room hotel with hot water

for showers and pool.

120 m2 X10 PV/T

12 kWp electricity

50 kWp hot water

Conclusion: Solar Concentrators for

Medium temperatures and PV/T

• Rooftop or ground mounted Solar Concentrators can

generate heat, hot water and electricity

• Many regions with high direct solar radiation is very

suitable for solar concentrators

• Solar concentrators are profitable both for process

heat and for hot water and electricity in buildings

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Solar Heat

200°C

Steam

160°C 5°C

35°CFa

n

Solar

Cooling

Inverter

230 V AC

Tank

Solar PV + Thermal systemSolar Cooling

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