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Design and experimental evaluation of microchannels-based thermal absorbers for solar collectors

Grant number: 17/12576-5
Support type:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): April 01, 2019
Effective date (End): March 31, 2020
Field of knowledge:Engineering - Mechanical Engineering
Principal Investigator:Gherhardt Ribatski
Grantee:Debora Carneiro Moreira
Supervisor abroad: Satish Gopalrao Kandlikar
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Local de pesquisa : Rochester Institute of Technology (RIT), United States  
Associated to the scholarship:15/24834-3 - Development of high performance heat spreaders based on MULTI-MICROCHANNELS with micro- and nanostructured surfaces aiming applications in solar absorbers, BP.PD

Abstract

The ability to absorb or dissipate heat in restricted spaces is a main issue to the development of technology in various fields. For instance, the heat absorption by fluids in mini-or microchannels based solar collectors is a promising way of clean and renewable energy use. Many studies endorse the great potential of flow boiling based devices as heat spreaders or absorbers, especially due to high heat transfer rates and low temperature gradients, provided by phase change mechanisms. However, such devices are still under development, and some reported problems must be overcome, like high pressure-drop, low critical heat flux, surface superheating, and thermal instabilities. In this sense, it is recommended that these heat exchangers are designed according to specific requirements inherent to the planned application. Recently, the research group from the Thermal Analysis, Microfluidics, and Fuel Cells Laboratory in the Rochester Institute of Techology (RIT) has developed novel techniques to reduce pressure loss and increase the critical heat flux. In this context, the present research project proposes the design and characterization of high-performance heat absorbers for solar collectors based on flow boiling in microchannels. The techniques developed by the group led by Prof. Satish G. Kandlikar will be employed in the conception of new devices, which will be fabricated and experimentally evaluated according to the pressure loss coefficient, global heat transfer coefficient, and critical heat flux. (AU)