A Novel Indirect Parabolic Solar Cooker

Type Journal Article - Journal of Electrical Engineering
Title A Novel Indirect Parabolic Solar Cooker
Author(s)
Volume 5
Publication (Day/Month/Year) 2017
Page numbers 137-142
URL http://www.davidpublisher.org/Public/uploads/Contribute/592f8caa496ed.pdf
Abstract
The continuous increase in global demand and cost of electricity are some of the reasons that solar cooking has received
much attention recently. Another factor which has also contributed to the acceptance of solar cookers is global campaigns against
actions that contribute to climate change. Various types of solar cookers are currently in existence, these are box, panel and parabolic
cookers. Some solar cookers only function when the cooking section is placed under direct sunshine, while others have been modified
to cook without directly exposing their cooking section to the sun. Most solar cookers face similar challenges, and these include,
exposure of users to sun, inability to function at night or when there is no sunshine, low utilization efficiency and technical complexities.
This report presents an indirect parabolic cooker that eliminates the identified solar cooker challenges. The cooker uses a parabolic
reflector to focus the sun rays to a frustum shaped receiver that was placed at its focus. The cooker has an insulated cooking/heat storage
tank which was separated from the dish and cavity receiver system. The heat transfer fluid was distributed through the system with the
aid of high temperature flexible hoses. Several cooking tests including water boiling and pancake baking were done, an extensive
analysis of cooking based on the international testing procedures for solar cookers was also carried out. This solar cooker had a
utilization efficiency of 39%, an overall calculated exergy efficiency of 0.05% and an average characteristic boiling time of
approximately 13 minutes/kg. The manufactured solar cooker in this study was used for family cooking.

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