Switchable diurnal radiative cooling by doped VO2

Minkyung Kim; Dasol Lee; Younghwan Yang; Junsuk Rho

doi:10.29026/oea.2021.200006

Journals >Opto-Electronic Advances >Volume 4 >Issue 5 >Page 200006-1 > Article

Opto-Electronic Advances
Vol. 4, Issue 5, 200006-1 (2021)

Switchable diurnal radiative cooling by doped VO₂

Minkyung Kim¹, Dasol Lee¹, Younghwan Yang¹, and Junsuk Rho^1,2,*

Author Affiliations

¹Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea

²Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea

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DOI: 10.29026/oea.2021.200006 Cite this Article

Minkyung Kim, Dasol Lee, Younghwan Yang, Junsuk Rho. Switchable diurnal radiative cooling by doped VO₂[J]. Opto-Electronic Advances, 2021, 4(5): 200006-1 Copy Citation Text

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Abstract

This paper presents design and simulation of a switchable radiative cooler that exploits phase transition in vanadium dioxide to turn on and off in response to temperature. The cooler consists of an emitter and a solar reflector separated by a spacer. The emitter and the reflector play a role of emitting energy in mid-infrared and blocking incoming solar energy in ultraviolet to near-infrared regime, respectively. Because of the phase transition of doped vanadium dioxide at room temperature, the emitter radiates its thermal energy only when the temperature is above the phase transition temperature. The feasibility of cooling is simulated using real outdoor conditions. We confirme that the switchable cooler can keep a desired temperature, despite change in environmental conditions.

Keywords

Fabry-Pérot resonance passive thermoregulation phase change material photonic crystal switchable radiative cooling

${\textit{ε}}_{\rm{transition}}={\rm{arctan}} \left(\frac{T-T_{{\rm{c}}}}{{\rm{Δ}} T} \times 10\right) \times \frac{{\textit{ε}}_{\mathrm{\rm{m}}}-{\textit{ε}}_{\mathrm{\rm{i}}}}{2 {\rm{arctan}} 10}+\frac{{\textit{ε}}_{\mathrm{\rm{m}}}+{\textit{ε}}_{\mathrm{\rm{i}}}}{2}\;, $

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\begin{aligned} P (T) = & P_{r a d} (T) - P_{s u n} \\ - P_{a t m} (T_{a m b}) - P_{c c} (T, T_{a m b}), \end{aligned}

(2)

\begin{aligned} P_{a t m} (T_{a m b}) = & \iint_{0}^{\infty} I_{B B} (T_{a m b}, λ) E (T, λ, θ) \\ \cdot E_{a t m} (λ, θ) d λ \cos θ d Ω, \end{aligned}

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Minkyung Kim, Dasol Lee, Younghwan Yang, Junsuk Rho. Switchable diurnal radiative cooling by doped VO₂[J]. Opto-Electronic Advances, 2021, 4(5): 200006-1

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