THERMODYNAMIC ANALYSIS OF PLANAR MULTILAYERED COOLING SURFACE WITH NANOCONE STRUCTURE FOR PASSIVE RADIATIVE COOLING

• Main Author: Dila Nur Pradana, Daffa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/79132
• Institution: Institut Teknologi Bandung

Passive radiative cooling is achievable by the use of a cooling surface that is selectively designed to have certain absorptivity and emissivity spectrum. Other studies have shown that adding nanocone structures to a dielectric film, such as planar multilayered cooling surface, may increase its absorptivity. This increase in absorptivity is expected to increase the cooling power that could be emitted by the cooling surface. This research is conducted to determine the effect of adding nanocone structure to some existing planar multilayered cooling surfaces. The effect is quantified by its theoretical cooling power and steady-state temperature. These parameters are obtained through thermodynamic analysis which requires absorptivity and emissivity spectrum of the cooling surfaces. This spectrum is obtained through numerical simulation with finite difference element analysis using COMSOL Multiphysics software. This research shows that the addition of nanocone structure with diameter of 300 nm can increase the average absorptivity and emissivity of the cooling surface. This increase is also observed with increasing height of the nanocone structure from 50 nm to 150 nm. However, increasing the absorptivity and emissivity does not always result in a decrease in steady-state temperature and an increase in cooling power. This result is observed because apart from emissive power, the irradiation absorbed by the cooling surface also increases with increasing absorptivity and emissivity.