scholarly journals Modeling of a Solar Receiver for Superheating Sulfuric Acid

2015 ◽  
Author(s):  
Justin L. Lapp ◽  
Alejandro Guerra-Niehoff ◽  
Hans-Peter Streber ◽  
Dennis Thomey ◽  
Martin Roeb ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Sulfuric Acid ◽  
Thermodynamic Analysis ◽  
Sulfur Cycle ◽  
Transfer Model ◽  
Modeling And Analysis ◽  
Concentrated Solar Energy ◽  
And Performance ◽  
Solar Receiver ◽  
Individual Design

A volumetric solar receiver for superheating evaporated sulfuric acid is developed as part of a 100kW pilot plant for the Hybrid Sulfur Cycle. The receiver, which uses silicon carbide foam as a heat transfer medium, heats evaporated sulfuric acid using concentrated solar energy to temperatures up to 1000 °C, which are required for the downstream catalytic reaction to split sulfur trioxide into oxygen and sulfur dioxide. Multiple approaches to modeling and analysis of the receiver are performed to design the prototype. Focused numerical modeling and thermodynamic analysis are applied to answer individual design and performance questions. Numerical simulations focused on fluid flow are used to determine the best arrangement of inlets, while thermodynamic analysis is used to evaluate the optimal dimensions and operating parameters. Finally a numerical fluid mechanics and heat transfer model is used to predict the temperature field within the receiver. Important lessons from the modeling efforts are given and their impacts on the design of a prototype are discussed.

scholarly journals Modeling of a Solar Receiver for Superheating Sulfuric Acid

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Justin L. Lapp ◽  
Alejandro Guerra-Niehoff ◽  
Hans-Peter Streber ◽  
Dennis Thomey ◽  
Martin Roeb ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Sulfuric Acid ◽  
Thermodynamic Analysis ◽  
Transfer Model ◽  
Heat Transfer Medium ◽  
Modeling And Analysis ◽  
Concentrated Solar Energy ◽  
And Performance ◽  
Solar Receiver ◽  
Individual Design

A volumetric solar receiver for superheating evaporated sulfuric acid is developed as part of a 100 kW pilot plant for the hybrid sulfur (HyS) cycle. The receiver, which uses silicon carbide foam as a heat transfer medium, heats evaporated sulfuric acid using concentrated solar energy to temperatures of 1000 °C or greater, which are required for the downstream catalytic reaction to split sulfur trioxide into oxygen and sulfur dioxide. Multiple parallel approaches for modeling and analysis of the receiver are used to design the prototype. Focused numerical modeling and thermodynamic analysis are applied to answer individual design and performance questions. Numerical simulations focused on fluid flow are used to determine the best arrangement of inlets, while thermodynamic analysis is used to evaluate the optimal dimensions and operating parameters. Finally, a numerical fluid mechanics and heat transfer model is used to predict the temperature field within the receiver. Important lessons from the modeling efforts are given, and their impacts on the design of a prototype are discussed.

Nonuniform heat transfer model and performance of parabolic trough solar receiver

Energy ◽  
2013 ◽  
Vol 59 ◽  
pp. 666-675 ◽  
Author(s):  
Jianfeng Lu ◽  
Jing Ding ◽  
Jianping Yang ◽  
Xiaoxi Yang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Parabolic Trough ◽  
And Performance ◽  
Solar Receiver

Transient Three-Dimensional Heat Transfer Model of a Solar Thermochemical Reactor for H2O and CO2 Splitting via Nonstoichiometric Ceria Redox Cycling

2013 ◽  
Author(s):  
Justin Lapp ◽  
Wojciech Lipiński
Keyword(s):  
Heat Transfer ◽  
Heat Recovery ◽  
Fuel Efficiency ◽  
Three Dimensional ◽  
Reactor Design ◽  
Heat Transfer Model ◽  
Heat Fluxes ◽  
Transfer Model ◽  
Rotating Cylinders ◽  
Solar Receiver

A transient heat transfer model is developed for a solar reactor prototype for H2O and CO2 splitting via two-step non-stoichiometric ceria cycling. Counter-rotating cylinders of reactive and inert materials cycling between high and low temperature zones permit continuous operation and heat recovery. To guide the reactor design a transient three-dimensional heat transfer model is developed based on transient energy conservation, accounting for conduction, convection, radiation, and chemical reactions. The model domain includes the rotating cylinders, a solar receiver cavity, and insulated reactor body. Radiative heat transfer is analyzed using a combination of the Monte Carlo method, Rosseland diffusion approximation, and the net radiation method. Quasi-steady state distributions of temperatures, heat fluxes, and the non-stoichiometric coefficient are reported. Ceria cycles between temperatures of 1708 K and 1376 K. A heat recovery effectiveness of 28% and solar-to-fuel efficiency of 5.2% are predicted for an unoptimized reactor design.

Design and Performance Evaluation of Advanced Window Systems

2005 ◽  
Author(s):  
Amy Butterfield ◽  
Richard D. Wilk
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Resistance ◽  
Window Glass ◽  
Silica Aerogels ◽  
Transfer Model ◽  
Numerical Heat Transfer ◽  
Air Space ◽  
And Performance ◽  
Constant Heating

This paper presents the results of a study to compare the heat transfer characteristics of silica aerogels to that of air. A small window unit was made with a section having monolithic silica aerogels sandwiched between two plates of window glass. Another section had just an air space in between. Upon constant heating, steady state temperature measurements were made across the window unit. These data were used to infer apparent thermal resistance values for each case. The measured results showed that the aerogel insulation had a thermal resistance approximately 20% greater than that of air alone. A numerical heat transfer model of the system was developed in Cosmosworks. The model was used to match the experimental results and determine calculated thermal conductivity values for each of the interface cases: silica aerogel and air. The calculated thermal conductivity value of the aerogel matched well with typical values for this material. The calculated value for air though was approximately four times higher than the published value. This difference was attributed to the occurrence of free convection in the air space which was not accounted for in the model.

A 50 kW Fluidized Bed High Temperature Solar Receiver: Heat Transfer Analysis

1988 ◽  
Vol 110 (4) ◽  
pp. 313-320 ◽  
Author(s):  
G. Flamant ◽  
D. Gauthier ◽  
C. Boudhari ◽  
Y. Flitris
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Large Diameter ◽  
Pilot Scale ◽  
Heat Transfer Analysis ◽  
Transfer Model ◽  
Front Wall ◽  
Measured Efficiency ◽  
The Mean ◽  
Solar Receiver

A theoretical and experimental investigation of a pilot scale solar fluidized bed receiver is presented. Large diameter alumina particles were used. Experimental data with the bed in the temperature range of 550° C to 915° C (wall 740° C–1035° C) are compared with a simple model based on one parameter: the mean front wall temperature. At 950° C, the predicted efficiency is 73 percent and the measured efficiency is about 65 percent. In addition, unsteady behavior of the receiver is described by a simple heat transfer model.

Sign in / Sign up

Export Citation Format

Share Document