Fresnel collector

INDUSTRIAL SOLAR - FRESNEL COLLECTOR

Linear Fresnel solar collector Principle:

• Direct irradiation hits the reflective surface of the mirrors which is slightly bended in order to concentrate the reflected sunrays

• All mirrors are in a different angle as the relative position (sun – mirror – absorber tube) is different.

• The reflected sunrays hit the absorber tube. The radiation missing the absorber tube hits the secondary reflector which again concentrates the radiation on the absorber tube.absorber tube.

• The absorber tube consists of an inner stainless steel absorber pipe and an out evacuated glass envelope. The vacuum reduces the heat losses from the absorber pipe.

• A heat transfer fluid is circulated through, and heated within the absorber tube. The fluid transports the heat to a process where it transfers the heat via heat exchangers. Later it is re-circulated through the absorber tube.

• The control system determines the exact mirror position for each mirror based on the exact location, date and time. Sensors double check the position and can induce recalibration.

INDUSTRIAL SOLAR - FRESNEL COLLECTOR

• Industry is a major energy consumer accounting for around 30% of total final energy demand. Within the total industrial energy demand process heat has the major share with around 67%. A major part, around 57% of total process heat demand, is in a medium temperature range (<400°C) and can be provided with Industrial Solar Fresnel Collector technology.

• Significant share of the heat consumed in the industrial sector is in the low and medium temperature range i.e. below 100°C and below 400°C respectively.

• PROCESS HEAT is the most important form of energy used in industrial processes. It is commonly applied via heat exchangers from a distribution grid. Steam is the dominant heat carrier in industry (e.g. for food and textiles). Industrial Solar´s Fresnel collector can generate saturated or applied via heat exchangers from a distribution grid. Steam is the dominant heat carrier in industry (e.g. for food and textiles). Industrial Solar´s Fresnel collector can generate saturated or superheated steam directly. Alternatively, thermal oil or pressurized water can be used as the heat transfer fluids which are both ideally suited to integrate into solar process heat solutions.

• COOLING is the second most critical production factor in industrial processes; such as for storing perishable goods, cooling in production processes and cooling the manufacturing equipment itself. In addition, cooling is becoming increasingly important for air-conditioning office buildings, shopping malls, hospitals and many other facilities. Solar cooling solutions convert solar thermal energy directly into cooling power by means of thermally driven chillers.

• Regions with DNIs (Direct Normal Irradiation) above 1,500 kWh / (m2 a) are best suited for solar process heat applications based on Industrial Solar‘s Fresnel collector technology.

Based on Industrial Solar‘s innovative Fresnel collector, decentralized renewable process heat can be

generated for various industrial applications and requirements with temperatures of up to 400 °C.

Industrial Solar linear Fresnel collector LF-11

• Linear focusing solar collector

• Generating process heat in the range of 100 kW to 10 MW at pressures up to 120 bar (standard 40bar) and temperatures up to 400°C.

• Different heat transfer fluids can be used like pressurized water or thermal oil, or high temperature

INDUSTRIAL SOLAR - FRESNEL COLLECTOR

• Different heat transfer fluids can be used like pressurized water or thermal oil, or high temperatureglycol but it is also possible to directly generate or even superheat steam.

Thermal performance characteristics

• Due to the vacuum absorber, thermal performance is independent of wind speed.

• Maximum operating temperature: 400°C

• Thermal Output under reference conditions: 12.3 KW per standard module

• 562 W/m2) in terms of primary reflector aperture area (Under reference conditions)

• 375 W/m2 in terms of installation area usage (under reference conditions)

Matches industrial requirements:

• Primary mirrors are made of flat glass for longer durability and reflectivity

• Individually tracked mirror rows ensure precise power and temperature control

• High quality vacuum absorber tubes guarantees optimal thermal efficiency

• High system stability due to reliable industrial control technology

Easy rooftop installation:

• Low wind load and good weight spread

• No heavy machinery required for installation

• No need for north-south alignment

• High ground-usage factor saves valuable ground area

ADVANTAGES

• High ground-usage factor saves valuable ground area

• Reduced cooling demand of building due to shade produced by collector on roof

High pressure steam:

• Stationary absorber tubes ensure consistent steam quality

• Absorber tube diameter of 70mm enables high flow rates with minimal pressure loss

• No twisting of flexible connections

Low operational & maintenance costs:

• Mirrors can be cleaned automatically with almost no water consumption

• Individual mirror rows are easy to access

• Components are designed for long life-time and need almost no maintenance (mirrors/tubes/drives)

Control:

• Accurate temperature control and no stagnation or overheating

High temperatures

• The Fresnel-Collector can achieve temperatures of up to 400°C when compared to

Flat plate collectors, Vacuum Tube collectors and Non-concentrating solar thermal

collectors

Integration at system level

• As the Fresnel-collector provides high temperatures it can, not only be used for

Advantages:

In comparison to: Flat plate collectors (FPC), Vacuum Tube collectors (VTC)

• As the Fresnel-collector provides high temperatures it can, not only be used for

preheating but also operate parallel to a conventional boiler.

No overheating

• The Industrial Solar Fresnel collector is equipped with thermometers which

automatically defocus the mirrors if a certain temperature limit is exceeded.

Low weight and wind load

• Low weight and wind load

The collector weighs only around 30kg/m². In addition, the wind loads are much lower as the

main surface is horizontal.

• Ground-space efficiency

As different modules do not shade each other they can be aligned closely, making fuel use of

available space

• Structural advantages

Compared to the parabolic trough collector the absorber tube is fixed above the mirrors.

Advantages:

In comparison to: Parabolic Trough Collector (PTC)

Compared to the parabolic trough collector the absorber tube is fixed above the mirrors.

Thus, no flexible, high-pressure, high-temperature joints have to be used

• Direct-steam generation

In linear Fresnel collectors concentrated sunlight hits the absorber tube only from below. This

is much better for direct steam generation due to a better heat transfer. Moreover, thermal

stresses on the absorber tube are reduced.

• Cleaning / operation & maintenance

Due to the flat and horizontally aligned mirrors the collector field can easily be accessed and

cleaned. The water demand for cleaning is much lower as for parabolic trough collectors. For

large collector fields also cleaning robots can be used.

1. Solar Process Heat-

Industrial Solar´s Fresnel collector can generate saturated or superheated steam

directly

2. Solar Thermal Cooling-

Absorption chillers are powered by Heat & this heat can be provided by Solar

energy

TURNKEY SOLUTIONS- by means of Fresnel Collector

energy

Thus Solar Cooling can achieve:

• Less CO2 emission per unit cold

• Less blackouts as reduced electricity demand reduces the peak demand

• Less investment in the grid due to reduced peak demands

3. Solar thermal Desalination

• Multi-effect desalination (MED), can be powered by heat

• Salty water is heated and evaporated thereby water is separated from the brine.

4. Poly generation:

• When various processes / applications are fed by the same solar system it is called

Polygeneration. (E.g. Power + Heat)

5. Hybrid Systems

• As storing energy is very expensive it is currently not feasible to build stand-alone

systems. Thus, solar systems are most of the time hybrid systems in combination

TURNKEY SOLUTIONS- by means of Fresnel Collector

systems. Thus, solar systems are most of the time hybrid systems in combination

with an alternative energy supply (e.g. fossil). The solar share reduces the fuel

demand by up to 70% depending on the load profile

6. Integration of Solar Process Heat:

There are three different ways to integrate solar process heat in industrial facilities.

• Pre-heating of boiler feed water

• Steam generation and integration in distribution network

• Direct feeding of process

GENERAL DATA OF BASIC MODULE

Industrial Solar GmbH has the expertise of all kind of renewable energy technologies and thus

provides customized solutions in the medium power range for industrial enterprises.

Industrial Solar is world leader in solar CSP FRESNEL collector projects for industrial applications

including direct steam solutions with over 13 systems installed in various countries. Industrial

Solar offers a medium scale linear Fresnel collector for solar process heat applications and

smaller ISCC projects and has recently entered into

a) an exclusive cooperation agreement with Royal Tech CSP for the Chinese market

CSP PRODUCT PORTFOLIO

a) an exclusive cooperation agreement with Royal Tech CSP for the Chinese market

b) a general cooperation with FRENELL for large industrial scale process heat & power projects

small LFC large LFC large PTC

Heat

Transfer

Fluid

thermal oil ✓ ✗✗✗✗ �

pressurized water � ✗✗✗✗ ✗✗✗✗

direct steam generation � ✗✗✗✗ ✗✗✗✗

TECHNOLOGY SELECTION CRITERIA

molten salt ✗✗✗✗ � ✗✗✗✗

Thermal

Power

minimum 1 MW 10 MW 10 MW

maximum 10 MW 1000 MW 1000 MW

Installationrooftop ✓ ✗✗✗✗ ✗✗✗✗

ground ✓ � �

Energy storage

✓ � ✓

���� standard ✓✓✓✓ available ✗✗✗✗ not available

Technologies and Options of RE

Fresnel

Air-Collector

ETC-Collector

Chiller

Process Heat

Process Cold

• Process Temperature

• Heat Transfer Fluid (Steam/Water/Oil)

• Local Energy Costs

• Available Area (Roof/Ground)

• Roof Load

• Irradiation DNI, GHI

Application Solution / Products Selection Criterias

Air-Collector Chiller

Photovoltaic

Reverse Osmosis

CHP

MD-Distillation

Enit-Agent

Reverse Osmosis

Enit-Agent

Power Generation

Large Scale CSP

Energy Monitoring & Management

• Irradiation DNI, GHI

• Solar Fraction Target

• Storage

• Air-Volume

• Delta-T

• Grid-Connection

• Gas-Pipeline-Connection

• Diesel-Generator onsite

• Power Shortages

• Load-Profile

• Meters

• Financing Options

PTRFresnel

Amman / Jordan