Abstract
The daytime radiative cooling technology is becoming crucial with several prospective applications, either as a standalone or in conjunction with conventional cooling systems; however, the dilute cooling flux is a main drawback. The cooling flux can be enhanced by proper surface orientation (direction or azimuth and tilting or inclination), but it has not been studied extensively. Hence, this study describes the radiative cooler's angular and directional-dependent performance. The angular and directional dependent study is essential to emphasize the further development in the radiative coatings' suitable macro-scale geometry. An optimized polymer-particle composite structured daytime radiative cooler has been developed and tested with maximum temperature drop from the ambient as an objective function. The north-facing radiative cooler starts to perform better up to a 30° tilt angle; after that, its performance tends to decrease. The south-facing surfaces have reduced performance due to higher solar flux exposure as well as reduced sky exposure. A flat surface receives the maximum sky exposure since its horizontal placement does not interfere with the earth's objects. A maximum of 10.5 °C temperature drop and an average maximum of 5.5 °C are observed. North-facing tilt up to 30° is recommended in the northern hemisphere and vice-versa for best performance.
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