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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Numerical Modelling of Combined Natural Convection and Surface Radiation Heat Transfer in Cavity Receiver with Plate Fins

Get access (open in a dialog) DOI: 10.1615/IHTC15.rne.009869
pages 7337-7351

Résumé

The potential of using concentrating solar technology for power generation is huge. There are several types of concentrating systems and the parabolic dish-receiver assembly is one of such systems that is promising. In terms of configuration, it usually consists of a reflector in the form of a dish with a downward facing receiver at the focus of the dish. . A cavity receiver is used to maximise the absorption of the concentrated solar flux. However, the receiver is subjected to environmental variations, as well as changes in receiver inclination angle that affect the overall receiver performance leading to energy loss. It is essential to effectively minimise heat loss in the cavity receiver in order to improve the system efficiency. The numerical study of combined laminar natural convection and surface radiation heat transfer in cavity receiver with plate fins is presented in this paper and three-dimensional simulation model is developed to estimate the convective and radiative heat losses. The influence of operating temperature, emissivity of the surface, orientation and the geometric parameters on the total heat loss from the receiver is investigated. It is observed that convective heat loss from the cavity receiver is significantly influenced by the inclination, the presence of fins and the number of fins in the receiver whereas the radiation heat loss is considerably affected by surface properties of the receiver. The radiation heat loss was found to be constant for all inclinations angles of the receiver. There is significant reduction in total heat loss from the cavity receiver can be achieved by using the plate fins, which act as heat transfer suppressors.