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SOLARSTEP FUNDED PROJECTS the process components. The use of a particle-based heat-transfer medium makes it possible to use open particle receivers to absorb the solar radiation and to deploy the heated particles in a separate reactor in order to supply the high temperatures needed when reducing the redox particles. The use of heat-transfer particles also enables the recovery of sensible heat from the reduced redox material [24, 25]. To examine the heat recovery process, a test rig was developed that enabled heat to be transferred between two particle streams. The test setup was used to quantify heat transfer at temperatures above 1100 °C. It could be shown that by allowing the two types of particles to mix, very high heat transfer ra- tes could be achieved allowing contact times to be kept short. The proposed heat recovery concept involves a carefully configured multistage sequence that enables quasi-countercurrent heat transfer between the two particle ty- pes, achieving heat recovery rates of more than 50% [24-26]. The concept was incorporated into a process model in order to test the in- fluence of different process parameters. The model showed, for example, that the energy required to drive the vacuum pumps can have a significant impact on process efficiency. The overall efficiency could therefore be de- termined as a function of the oxygen partial pressure in the reactor and op- timised accordingly [25]. 2.6.4 Exploitation, commercialisation and dissemination of results 2.6.4.1 How can the results be used in future? What are the realistic expectations? SolarStep has generated valuable data and results regarding solar thermo- chemical cycles. This information has been disseminated via publications, presentations at international conferences and patent filings and is now part of the scientific debate. These new results provide further support for the proposition that solar thermochemical cycling is a promising technology and intensive research in the field is continuing as a result. The information, methods, concepts and test equipment that were generated and developed during the project are now being deployed in a variety of forms in other projects where they are undergoing further development and improvement. The use of redox materials in particle form is one area of the project that has developed into an important area of current research that is being pursued in a number of locations. Interfaces with other projects addressing related issues are also being exploited, such as examining the use of particle receiver 167PDF Image | Chemical Processes and Use of CO2
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