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Technical Brief

Modeling and optimization of transparent thermal insulation material

[+] Author and Article Information
Marek Lewkowicz

Faculty of Mechanical and Power Engineering, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
marek.lewkowicz@pwr.edu.pl

Sameh AlSaqoor

Mechanical Engineering Department, Tafila Technical University, Tafila, Jordan
sameh@wp.pl

Ali Alahmer

Mechanical Engineering Department, Tafila Technical University, Tafila, Jordan
a.alahmer@ttu.edu.jo

Gabriel Borowski

Environmental Engineering Faculty, Lublin University of Technology, Lublin, Poland
g.borowski@pollub.pl

1Corresponding author.

ASME doi:10.1115/1.4040197 History: Received November 13, 2017; Revised April 30, 2018

Abstract

Selected properties of transparent insulations made of a layer of parallel, small-diameter, thin-walled, visible light transparent pipes placed perpendicularly to the surface of a ?at solar collector were investigated theoretically. A formula for the balance radiation heat losses through the insulation was derived based on the two main assumptions: the system is in steady state and the fourth power of the temperature along each pipe is linear. This formula, combined with standard formulas for the conductive heat ?ux, enables to predict that under typical insolation of 1200 W/m2, a 10 cm thick transparent insulation could lead to the temperature of the absorber reaching 484 °C and could give 530 W mechanical power under the assumption that the heat is transformed into mechanical power according to the ideal Carnot cycle. Moreover, the results showed that higher values of the aspect ratio are needed for the satisfactory energy conversion e?ciency.

Copyright (c) 2018 by ASME
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