E3S Web Conf.
Volume 128, 2019XII International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2019)
|Number of page(s)||7|
|Section||Heat and Mass Transfer in Energy Systems|
|Published online||08 November 2019|
Numerical investigation of heat losses through cascaded fully open cavity receiver at high temperatures up to 500°C
Mechanical Engineering Department, Veermata Jijabai Technological Institute
2 Mechanical Engineering Department, K. J. Somaiya College of Engineering Mumbai 400 072, India
* Corresponding author: email@example.com
In solar thermal systems, especially for high concentration applications, natural convection and radiation contributes a significant fraction of energy loss. Its characteristics hence need to be understood to improve system efficiency. In this work a numerical study is carried out to investigate the heat loss through a cascaded cavity receiver of a solar dish collector. The effect of increase in area ratio on heat loss is studied. The cascaded cavity receiver model is electrically heated with constant heat flux. A simulation model for combined natural convection and surface radiation is developed. The influence of orientation of the receiver, and the geometry on total heat loss from the receiver is investigated. The cavity inclination is varied from 0° to 90° in steps of 30°. The Computational Fluid Dynamics package “ANSYS 19.2 Fluent” has been used to numerically investigate the influence of cavity geometry and inclination on the convective loss through the aperture.The cascaded cavity receiver is found to reduce the natural convection and radiation heat losses.
Key words: Natural convection / solar cavity receiver / heat loss / numerical study / cascaded cavity
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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