Thermal Performance of Various Window Films for Vehicles

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Author list: Rakkwamsuk, P.;Kubaha, K.;Kiawpan, T.

Publication year: 2016

Journal: Engineering Journal Chiang Mai University (0857-2178)

Volume number: 23

Issue number: 1

Start page: 60

End page: 72

ISSN: 0857-2178

URL: http://researchs.eng.cmu.ac.th/?name=journal&file=readjournal&id=30

Abstract

This research aimed to study thermal performance of various window films for cars, i.e., ordinary film, heat protection film and safety-heat protection film. In the study, an experiment was performed with a small car and developed a mathematical model using MATLAB. The mathematical model was developed to predict surface temperature, mean radiant temperature and heat transfer into car-cabin. The results found that all three types of film with high optical intensity film performed high inner surface window temperature. On the other hand, the low optical intensity film presented low inner surface temperature. Considering, the mean radiant temperature reduction, the best film performance was heat protection film in which can be reduced up to 6.8๐ C. While the safety-heat protection and ordinary films can reduce to 5.5๐ C and 4๐ C, respectively (at the same optical intensity). The study of heat transfer into car-cabin showed that the amount of heat transfer through windshield up to 42%. For window glass without film, the total solar heat gain was 1,638 W. It was reduced to 940 W when installing heat protection film. Also it will reduced up to 815 W and 534 W, when installing the safety-heat protection and ordinary film, or about 57%, 50% and 33% reduction, respectively. Finally, the findings showed that the good thermal performance of heat shielding film would indicate the SHGC be lower than 0.47 (47%).

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