Validation of a numerical model for the analysis of thermal-fluid behavior in a solar concentrator vessel

The need for innovation in the renewable energy sector is an ever-growing concern. With national-level disasters in the Gulf of Mexico, the necessity to begin the drive to develop effective and practical alternative energy sources becomes a more pressing concern. The CSPond project is an attempt to design a more simple solar thermal energy generation system that additionally addresses the intermittence issue. The CSPond system calls for a large container in which special salt mixtures are molten by solar thermal energy. The large container also acts as a thermal energy storage to address the intermittence issue that has held back the widespread application of solar energy systems. This thesis presents a validation analysis of a numerical simulation of a molten salt system. The simulation is part of a larger design effort to develop a viable solar thermal energy option which incorporates short to medium-term thermal storage. To validate the numerical model, a scaled version of the proposed solar vessel was used in the solar simulator built by Professor Slocum's PERG to simulate normal operation procedures. This data was then compared to the numerical simulations. This comparison found that the numerical simulation does not capture the dynamics of the temperature rise in the system, but that it does capture the Rayleigh-Taylor instabilities, characteristic of convection. Solutions to the issues identified above are proposed and analyzed. These include the consideration of several modes of thermal interactions with the environment, the optical interactions between the solar beam and the molten salt medium, modifying the boundary conditions and finally, including the temperature of all relevant thermophysical properties to better capture the convective behavior of the molten salt system.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2010

Author dc:creator

• Rodríguez Alvarado, Juan Fernando

Advisor dc:contributor.advisor

• .

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/59936

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/59936