Concentrating Solar Power

Whereas vacuum tube collectors deliver temperatures only up to 130 ºC, Concentrating Solar Power (CSP) can deliver process heat up to 450ºC. Consequently, a wide range of applications exist from process heat, steam to cooling.solar251

In the industrial field, around 2/3 of the energy consumption is thermal energy used for process heat. Moreover, many industrial processes require heat at high temperature and non-concentrating solar thermal collectors deliver temperatures up to 130 ºC.

Furthermore, some absorption chillers require heat at high temperature.The main advantages are:

  • Reduce fuel consumption
  • Reduce carbon emissions
  • Protect against price volatility of natural gas
  • Meet corporate sustainability goals

Concentrating solar panels is also suitable to power turbines or steam engines to generate electricity.

Technologies

 Linear Fresnel Technology

The Fresnel collector is a line-focusing system which uses individually tracked reflector rows to concentrate direct solar radiation onto a stationary linear receiver. A pressurized water circuit at 16 bars is a cost-effective and efficient way to transfer process. These systems aim to solar251aoffer lower overall costs by sharing a receiver between several mirrors, while still using the simple line-focus geometry with one axis for tracking .  This technology is modular (steps of 4m for example) and lighter than other technology (around 27 kg/m2). The peak power of the LFT is around 500 W/m2.Advatges

  • Output temperature up to 400°C
  • Reliable reflectors made of flat glass mirrors
  • Stationary receiver
  • Even weight distribution and small wind load make for easy rooftop installation
  • Precise automatic power and temperature control - no idleness or overheating problem
  • Installation close to process heat application on the roof of a production hall
  • High ground usage factor
  • The system does not need to be aligned on a north-south or east-west axis
  • Remote control and monitoring via LAN or internet
  • Top quality guarantees reliable operation, maximum output and therefore the highest possible cost-effectiveness

"MicroCSP"

This technology is based on the designs used in traditional Concentrating Solar Energy generating systems but are smaller in collector size, lighter and operate at lower temperatures usually below 315 °C. These systems are designed for modular field or rooftop installation where they are easy to protect from high winds, snow and humid deployments.
Example of applications

The number of possible applications is almost unlimeted. For example:

Process Heat:

The potential for solar thermally produced process heat is enormous: process heat accounts for two thirds of industry's final energy demand. A large portion of that lies in the temperature range of between 100 and 200 °C. With a thermal peak power between 100 kW and several MW it closes the gap between small solar thermal collectors and solar thermal power plants.

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Cooling

The energy demand for air conditioning in buildings is facing a significant growth. With cooling load demands being in phase with the sun's intensity, cooling from intense solar radiation is definitely the route to take in order to achieve the highest saving of energy. Solar cooling can help meet the electricity demand - especially in the peak summer months - and contribute to climate protection.

The high output temperatures of the concentrating solar panel (up t0 400°C) make make them the ideal solution to power second-stage absorption chillers, which can provide air-conditioning for large buildings or process cold in industry.

Power Generation

Due to the high output temperatures, CSP are perfectly suited to drive ORC-turbines or steam engines. Trigeneration (heat, cool and electricity) and cogeneration make them even more attractive. While today most of the technologies are used from 20 MW genererating capacity, CSP can be used for small generating capacity, from 250 kW to several MW.


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