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1. A cavity-receiver containing a tubular absorber for high-temperature thermochemical processing using concentrated solar energy

Melchior, Tom, Perkins, Christopher, Weimer, Alan W. and Steinfeld, Aldo (2008)

A solar chemical reactor consisting of a cylindrical cavity-receiver containing a tubular ceramic absorber is considered for performing thermochemical processes using concentrated solar radiation as the energy source of high-temperature process heat. The model chemical...


Journal Items

2. A 9-m-Aperture Solar Parabolic Trough Concentrator Based on a Multilayer Polymer Mirror Membrane Mounted on a Concrete Structure

Bader, Roman, Pedretti, Andrea and Steinfeld, Aldo (2011)

A large-span solar parabolic trough concentrator is designed based on a multilayer polymer mirror membrane mounted on a rotatable concrete structure. The multilayer membrane is contained in a transparent protective air tube and generates a multicircular profile that approaches the...


Journal Items

4. Amine-Based Nanofibrillated Cellulose As Adsorbent for CO(2) Capture from Air

Gebald, Christoph, Wurzbacher, Jan Andre, Tingaut, Philippe, Zimmermann, Tanja and Steinfeld, Aldo (2011)

A novel amine-based adsorbent for CO(2) capture from air was developed, which uses biogenic raw materials and an environmentally benign synthesis route without organic solvents. The adsorbent was synthesized through freeze-drying an aqueous suspension of nanofibrillated cellulose...


Journal Items

7. An ablation model for the thermal decomposition of porous zinc oxide layer heated by concentrated solar radiation

Dombrovsky, Leonid, Schunk, Lothar, Lipiński, Wojciech and Steinfeld, Aldo (2009)

Thermal decomposition of porous ZnO under high-flux solar irradiation is considered. The process is well described by a transient ablation model that couples radiation, conduction, and convection heat transfer to an Arrhenius-type kinetic rate law with a pre-exponential factor...


Journal Items

8. An Air-Based Cavity-Receiver for Solar Trough Concentrators

Bader, Roman, Barbato, Maurizio, Pedretti, Andrea and Steinfeld, Aldo (2010)

A cylindrical cavity-receiver containing a tubular absorber that uses air as the heat transfer fluid is proposed for a novel solar trough concentrator design. A numerical heat transfer model is developed to determine the receiver's absorption efficiency and pumping power...


Conference Contributions

9. An air-based cavity-receiver for solar trough concentrators

Bader, Roman, Barbato, Maurizio, Pedretti, Andrea and Steinfeld, Aldo (2010)

A cylindrical cavity-receiver containing a tubular absorber that uses air as the heat transfer fluid is proposed for a novel solar trough concentrator design. A numerical heat transfer model is developed to determine the receiver's absorption efficiency and pumping power...


Journal Items

10. An air-based corrugated cavity-receiver for solar parabolic trough concentrators

Bader, Roman, Pedretti, Andrea, Barbato, Maurizio and Steinfeld, Aldo (2015)

A tubular cavity-receiver that uses air as the heat transfer fluid is evaluated numerically using a validated heat transfer model. The receiver is designed for use on a large-span (9 m net concentrator aperture width) solar parabolic trough concentrator. Through the combination of...


Journal Items

11. Analysis of Conduction Heat Loss From a Parabolic Trough Solar Receiver with Active Vacuum by Direct Simulation Monte Carlo

Roesle, Matthew, Good, Philipp, Coskun, Volkan and Steinfeld, Aldo (2012)

Results are reported of a numerical analysis of conduction heat loss from a parabolic trough solar receiver with controlled pressure within the annular gap between the tubular absorber and the glass vacuum jacket. A direct simulation Monte Carlo (DSMC) model of rarefied gas within...


Journal Items

15. An array of coiled absorber tubes for solar trough concentrators operating with air at 600°C and above

Good, Philipp, Ambrosetti, Gianluca, Pedretti, Andrea and Steinfeld, Aldo (2015)

An entirely novel solar receiver design for solar trough concentrators is proposed using air as heat transfer fluid at operating temperatures exceeding 600 °C. It consists of an array of helically coiled absorber tubes contained side-by-side within an insulated groove having a...


Journal Items

16. A New High-Flux Solar Furnace for High-Temperature Thermochemical Research

Haueter, Philipp, Seitz, T. and Steinfeld, Aldo (1999)

A new high-flux solar furnace, capable of delivering up to 40 kW at peak concentration ratios exceeding 5000, is operational at PSI. Its optical design characteristics, main engineering features, and operating performance are described. This solar concentrating facility will be...


Journal Items

18. A novel beam-down, gravity-fed, solar thermochemical receiver/reactor for direct solid particle decomposition

Koepf, Erik, Advani, Suresh G., Steinfeld, Aldo and Prasad, Ajay K. (2012)

A novel solar-thermochemical reactor for the reduction of ZnO powder using concentrated sunlight has been designed, constructed and tested. The purpose of the reactor is to accomplish the first step in a two-step water-splitting process to generate hydrogen renewably from sunlight...


Journal Items

19. A novel high-flux solar simulator based on an array of xenon arc lamps

Petrasch, Jörg and Steinfeld, Aldo (2006)

The optical characteristics of a high-flux solar simulator that comprises an array of Xe-arc lamps with ellipsoidal specular reflectors of common focus is examined using the Monte Carlo ray tracing technique. The parameters varied are arc diameter, focal length, eccentricity,...


Conference Contributions

20. A novel 50 kW 11,000 suns high-flux solar simulator based on an array of xenon arc lamps

Petrasch, Jörg, Coray, Patrick, Meier, Anton, Brack, Max, Häberling, Peter, Wuillemin, Daniel and Steinfeld, Aldo (2007)

A novel high-flux solar simulator, capable of delivering over 50 kW of radiative power at peak radiative fluxes exceeding 11,000 suns, is operational at the Paul Scherner Institute. It comprises an array of ten Xe arcs, each close-coupled with ellipsoidal specular reflectors of...


Conference Contributions

21. A Numerical Investigation of Gas-Particle Suspensions as Heat Transfer Media for High-Temperature Concentrated Solar Power

Marti, Jan, Haselbacher, Andreas and Steinfeld, Aldo (2015)

This paper investigates the detailed heat-transfer mechanisms in dense gas-particle suspensions used as heat transfer media for high-temperature concentrated solar power applications. A two-phase Euler–Euler model for dense gas-particle systems is built on the open-source code...


Journal Items

External Document (Hide non-ETH publications)

24. Apparent Absorptance for Diffusely and Specularly Reflecting Spherical Cavities

Steinfeld, Aldo (1991)

The apparent absorptance of a cavity αcavity, is defined as the fraction of energy flux emitted by a black-body surface stretched across the cavity opening that is absorbed by the cavity walls. Because of multiple reflections among the cavity walls,...


Journal Items

27. A solar cavity-receiver packed with an array of thermoelectric converter modules

Suter, Clemens, Tomes, Petr, Weidenkaff, Anke and Steinfeld, Aldo (2011)

We report on the design of a solar cavity-receiver packed with an array of thermoelectric converter (TEC) modules, which enables efficient capture of concentrated solar radiation entering through a small aperture. A 1 kW demonstrator (proof-of-concept) containing 18 TEC modules,...


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28. A Solar Chemical Reactor for the Co-Production of Zinc and Synthesis Gas

Steinfeld, Aldo, Brack, Max, Meier, Anton, Weidenkaff, Anke and Wuillemin, Daniel (1998)

A novel solar chemical reactor has been designed to perform the combined ZnO-reduction and CH4-reforming processes. It consists of a gas-particle vortex flow confined to a solar cavity-receiver that is exposed to concentrated solar irradiation. A 5-kW reactor was fabricated and...


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29. A Solar Receiver-Reactor with Specularly Reflecting Walls for High Temperature Thermoelectrochemical and Thermochemical Processes

Steinfeld, Aldo and Fletcher, E.A. (1988)

A new kind of receiver-reactor for high temperature solar furnaces is proposed. The main body of the receiver component is an ellipsoid of revolution with specularly reflecting inner walls. The reactor component, a crucible, is placed at one focal point and the aperture at the...


Journal Items

31. Carbon Dioxide Reforming of Methane using an Isothermal Redox Membrane Reactor

Michalsky, Ronald, Neuhaus, Dominique and Steinfeld, Aldo (2015)

The continuous production of carbon monoxide (CO) and hydrogen (H2) by dry reforming of methane (CH4) is demonstrated isothermally using a ceramic redox membrane in absence of additional catalysts. The reactor technology realizes the continuous splitting of CO2 to CO on the inner...


Journal Items

36. Chemische Brennstofe aus Solarenergie

Meier, Anton and Steinfeld, Aldo (2009)


Monographs/Monograph Items

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37. CH4-Utilization and CO2-Mitigation in the Metallurgical Industry via Solar Thermochemistry

Steinfeld, Aldo, Kuhn, Peter and Tamaura, Yutaka (1996)

The industrial production of metals by carbothermic reduction of their oxides are high-temperature energy-intensive processes that release vast amounts of greenhouse gases and other pollutants to the atmosphere. A thermodynamic analysis and related experimental studies indicate the...


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38. Coal Gasification Using the ZnO/Zn Redox System

Tsuji, Masamichi, Wada, Yuji, Tamaura, Yutaka, Steinfeld, Aldo, Kuhn, Peter and Palumbo, Robert (1996)

A two-step thermochemical process is proposed for converting coal to high-quality synthesis gas. In the first, high-temperature, endothermic step, coal is reacted with zinc oxide to form metallic zinc and an H2-CO gas mixture. In the second, low-temperature, exothermic step, zinc...


Journal Items

40. Combined Experimental-Numerical Approach to Determine Radiation Properties of Particle Suspensions

Marti, Jan, Roesle, Matthew and Steinfeld, Aldo (2014)

A combination of experimental measurements with a numerical model is used to find the volume-averaged radiation properties—extinction coefficient, scattering albedo and approximated scattering phase function—of SiC particle suspensions with varying particle loadings. The...


Journal Items

41. Combined experimental-numerical approach to determine radiation properties of particle suspensions

Marti, Jan, Roesle, Matthew and Steinfeld, Aldo (2013)

A combination of experimental measurements with a numerical model is used to find the intensive radiation properties — extinction coefficient, scattering albedo and scattering phase function — of SiC particle suspensions with varying particle loadings. The experimentally...


Conference Contributions

43. Concentrated solar energy for thermochemically producing liquid fuels from CO2 and H2O

Loutzenhiser, Peter G., Stamatiou, Anastasia, Villasmil, Willy, Meier, Anton and Steinfeld, Aldo (2010)

A two-step solar thermochemical cycle for producing syngas from H2O and CO2 via Zn/ZnO redox reactions is considered. The first, endothermic step is the thermolysis of ZnO to Zn and O2 using concentrated solar radiation as the source of process heat. The second, non-solar,...


Journal Items

44. Concentrated solar energy for thermochemically producing liquid fuels from CO2 and H2O

Loutzenhiser, Peter G., Stamatiou, Anastasia, Villasmil, Willy, Meier, Anton and Steinfeld, Aldo (2011)

A two-step solar thermochemical cycle for producing syngas from H2O and CO2 via Zn/ZnO redox reactions is considered. The fi rst, endothermic step is the thermolysis of ZnO to Zn and O2 using concentrated solar radiation as the source of process heat. The second, non-solar,...


Journal Items

45. Concentrating solar thermal power and thermochemical fuels

Romero, Manuel and Steinfeld, Aldo (2012)

Concentrated solar energy provides a virtually unlimited source of clean, non-polluting, high-temperature heat. This article reviews the underlying principles of concentrating solar radiation and describes the latest technological advances and future prospects of solar thermal...


Journal Items

46. Concurrent Separation of CO2 and H2O from Air by a Temperature-Vacuum Swing Adsorption/Desorption Cycle

Wurzbacher, Jan Andre, Gebald, Christoph, Piatkowski, Nicolas and Steinfeld, Aldo (2012)

A temperature-vacuum swing (TVS) cyclic process is applied to an amine-functionalized nanofibrilated cellulose sorbent to concurrently extract CO2 and water vapor from ambient air. The promoting effect of the relative humidity on the CO2 capture capacity and on the amount of...


Journal Items

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47. Cone Compared to CPC as Secondary Concentrator in Tandem with a Paraboloidal Dish Primary

Steinfeld, Aldo (1992)

The three-dimensional compound parabolic concentrator (3-D CPC), a surface of revolution formed by rotating the 2-D CPC plane profile curve about its axis of symmetry, comes very close to achieving the maximum permissible geometric concentrator factor, given by:


Journal Items

49. CO2 reduction with Zn particles in a packed-bed reactor

Loutzenhiser, Peter G., Barthel, Frank, Stamatiou, Anastasia and Steinfeld, Aldo (2011)

A two-step solar thermochemical cycle for splitting CO2 with Zn/ZnO redox reactions is considered, consisting of: (1) the endothermic dissociation of ZnO with concentrated solar radiation as the heat source and (2) the non-solar, exothermic, reduction of CO2 to CO by oxidizing Zn...


Journal Items

50. CO2 Sequestration by Direct Gas−Solid Carbonation of Air Pollution Control (APC) Residues

Baciocchi, Renato, Polettini, Alessandra, Pomi, Raffaella, Prigiobbe, Valentina, Von Zedwitz, Viktoria Nikulshina and Steinfeld, Aldo (2006)

Direct gas-solid carbonation of alkaline residues from air pollution control (APC) systems was investigated with the aim of evaluating its contribution as a CO2 storage option as well as its effect on the properties of the residues, namely, the leaching behavior, which may affect...


Journal Items

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