International Journal of Engineering, Science and Mathematics Vol. 7Issue 3, March 2018, ISSN: 2320-0294 Impact Factor: 6.765 Journal Homepage: http://www.ijesm.co.in , Email: ijesmj@gmail.com Double-Blind Peer Reviewed Refereed Open Access International Journal - Included in the International Serial Directories Indexed & Listed at: Ulrich's Periodicals Directory ©, U.S.A., Open J-Gage as well as in Caďell’s DireĐtories of Puďlishing Opportunities, U.S.A 387 International Journal of Engineering, Science and Mathematics http://www.ijesm.co.in , Email: ijesmj@gmail.com Thermal analysis of Cylindrical Honeycomb Encapsulated Double Exposure Box-type Solar Cooker K.Saravanan  B.Janarthanan  Abstract The Double Exposure Solar Cooker (DESC) has been developed with cylindrical type honeycomb structure improve the heat transfer from solar energy. The cooking experiments were conducted with the water loading time during the summer seasons. The thermal performance of DESC with cylindrical honeycomb structure unit was compared with standard solar cooker. Experiments have been conducted with the two cookers in the months of April and May 2013 in the Department of Physics, Karpagam University, Coimbatore, Tamilnadu, India. The F1 and F2 values of double exposure solar cooker is comparable with the BIS values and suitability of the cooker in the location has been discussed. Keywords: Double Exosure; Solar Cooker; Thermal Performance; Honeycomb; Energy Balance. Copyright © 2018 International Journals of Multidisciplinary Research Academy. All rights reserved. Author correspondence: K.Saravanan, Assistant Professor, Department of Physics, SriBalamurugan arts &science college, Sathappadi, Salem, Tamilnadu, India. 1. Introduction Honeycomb structure can suppress the natural convection and obstruct the infrared radiation heat loss. Francia (1964) first proposed the use of very high aspect ratio cylindrical honeycombs made of glass and carbonized paper to suppress radiative losses from a solar collector. Hollands [1] has been found that the presence of selective transmitting honey comb in the collector helps to suppress and reduces the natural convection and radiation heat loss respective. The efficiency depends on the thickness of the honey comb wall. Arnold et al. [2] measured the heat transfer across liquid filled rectangular cell honeycombs with different aspect ratios and tilt angles. Buchberg et al., [3] has been proved that the efficiency of the solar collector is increased due to the presence of rectangular transparent honey comb. The use of honeycombs to reduce heat losses from solar collectors has been extensively studied. Nahar [6] designed a double reflector hot box solar cooker with transparent insulation material. Experiments are performed for solar cooker with the cylindrical type of honeycomb. The emphasis is to study the effects of diameter and aspect ratio of the honeycomb unit on the transmittance and efficiency of the solar cooker. In the present study, the proposed cooker with cylindrical honeycomb unit have been used to cook various food stuffs to predict the cooking time and it is found that the cooking time reduced when compared with ordinary box-type solar cooker. 2. Description of the DESC The DESC consists of a 0.6 x 0.30 m rectangular copper tray constructed of 0.005 m thick sheet. The sides of the copper tray encased in rectangular type DESC box made of plywood. The clearance between the copper tray and the encasing is filled with glass wool to provide thermal insulation. A glass covers are provided at the top(g 1 ) and bottom(g 2 ) side of the DESC. The cylindrical honeycomb structure unit fixed on the top of the glass plate(g 1 ). A boost mirrors is used to direct the radiation on the backside of the absorber  Assistant Professor, Department of Physics, SriBalamurugan arts &science college, Sathappadi, Salem, Tamilnadu, India.  Associated Professor, Department of Physics, Karpagam University, Eachanari Post, Coimbatore – 641021, Tamilnadu, India