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Mathematical Modelling of a Box Type Solar Cooker Incorporating Contact Resistance

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Title Mathematical Modelling of a Box Type Solar Cooker Incorporating Contact Resistance
 
Creator Vaidya, H. A.
Channiwala, S. A.
 
Subject Heat transfer
Metals
Performance test
Surface roughness
 
Description 922-931
A solar cooker is a device that uses solar energy to heat food to cook it. Solar cooking is used to reduce conventional
fuel usage and improve the quality of food. Solar cookers have to deal with high concentration heat flows through the
contact between metal parts of the absorber plate and the food vessel. For heat transfer, thermal contact resistance plays an
important role and it is a major concern to reduce the thermal resistance at the contact. In the present work, mathematical
modeling of a lightweight, energy-efficient box-type solar cooker is done by incorporating contact resistance. An
experimental setup is developed to find out the thermal contact resistance and thermal contact resistance is evaluated for
surface roughness of 0.2 Ra and 0.8 Ra for the Aluminum material. Performance tests of the cooker are carried out to get the
figure of merits F1 and F2. Also, the load test with the measured thermal contact resistance is carried out with surface
roughness of 0.8 and 0.2 Ra. For surface roughness of 0.2 Ra, the % error is observed as 19.77%, 13.69%, 13.68%
considering thermal resistance at joints, and −42.89%, 18.95%, and 16.37% without considering thermal resistance at joints.
For surface roughness of 0.8 Ra, the deviation is observed as 23.09%, 17.52%, 13.5% considering thermal resistance at
joints and −42.89%, 18.95% and16.37% without considering thermal resistance at joints. The figure of merit F1 is calculated
as 0.12 as compared to 0.11 for the commercial cookers, which shows that the newly designed cooker has higher optical
efficiency. The figure of merit F2 is calculated as 0.42 against 0.38 for the commercial cookers. The results thus emphasize
that thermal contact resistance is important and should be considered during modeling.
 
Date 2022-09-06T11:47:41Z
2022-09-06T11:47:41Z
2022-09
 
Type Article
 
Identifier 0022-4456 (Print); 0975-1084 (Online)
http://nopr.niscpr.res.in/handle/123456789/60492
https://doi.org/10.56042/jsir.v81i09.52645
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source JSIR Vol.81(09) [Sep 2022]