Passive radiative cooling design with broadband optical thin-film filters

Name: Passive radiative cooling design with broadband optical thin-film filters
Author: Kecebas, M. A., Mengüç, Mustafa Pınar, Kosar, A., Sendur, K.

İsim	Passive radiative cooling design with broadband optical thin-film filters
Yazar	Kecebas, M. A., Mengüç, Mustafa Pınar, Kosar, A., Sendur, K.
Basım Tarihi:	2017-09
Basım Yeri	- Elsevier
Konu	Passive radiative cooling, Thermal radiation, Broadband optical filters, Selective absorption and emission, Two-dimensional thin film coatings
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	1879-1352
Kayıt Numarası	6ef3b22a-76e2-4bac-bab8-16c821270500
Lokasyon	Mechanical Engineering
Tarih	2017-09
Örnek Metin	The operation of most electronic semiconductor devices suffers from the self-generated heat. In the case of photovoltaic or thermos-photovoltaic cells, their exposure to sun or high temperature sources make them get warm beyond the desired operating conditions. In both incidences, the solution strategy requires effective radiative cooling process, i.e., by selective absorption and emission in predetermined spectral windows. In this study, we outline two approaches for alternative 2D thin film coatings, which can enhance the passive thermal management for application to electronic equipment. Most traditional techniques use a metallic (silver) layer because of their high reflectivity, although they display strong absorption in the visible and near-infrared spectrums. We show that strong absorption in the visible and near-infrared spectrums due to a metallic layer can be avoided by repetitive high index-low index periodic layers and broadband reflection in visible and near-infrared spectrums can still be achieved. These modifications increase the average reflectance in the visible and near-infrared spectrums by 3–4%, which increases the cooling power by at least 35 W/m2. We also show that the performance of radiative cooling can be enhanced by inserting an Al2O3 film (which has strong absorption in the 8–13 µm spectrum, and does not absorb in the visible and near-infrared) within conventional coating structures. These two approaches enhance the cooling power of passive radiative cooling systems from the typical reported values of 40 W/m2–100 W/m2 and 65 W/m2 levels respectively.
DOI	10.1016/j.jqsrt.2017.03.046
Cilt	198

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Passive radiative cooling design with broadband optical thin-film filters

Yazar Kecebas, M. A., Mengüç, Mustafa Pınar, Kosar, A., Sendur, K.

Basım Tarihi 2017-09

Basım Yeri - Elsevier

Konu Passive radiative cooling, Thermal radiation, Broadband optical filters, Selective absorption and emission, Two-dimensional thin film coatings

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 1879-1352

Kayıt Numarası 6ef3b22a-76e2-4bac-bab8-16c821270500

Lokasyon Mechanical Engineering

Tarih 2017-09

Örnek Metin The operation of most electronic semiconductor devices suffers from the self-generated heat. In the case of photovoltaic or thermos-photovoltaic cells, their exposure to sun or high temperature sources make them get warm beyond the desired operating conditions. In both incidences, the solution strategy requires effective radiative cooling process, i.e., by selective absorption and emission in predetermined spectral windows. In this study, we outline two approaches for alternative 2D thin film coatings, which can enhance the passive thermal management for application to electronic equipment. Most traditional techniques use a metallic (silver) layer because of their high reflectivity, although they display strong absorption in the visible and near-infrared spectrums. We show that strong absorption in the visible and near-infrared spectrums due to a metallic layer can be avoided by repetitive high index-low index periodic layers and broadband reflection in visible and near-infrared spectrums can still be achieved. These modifications increase the average reflectance in the visible and near-infrared spectrums by 3–4%, which increases the cooling power by at least 35 W/m2. We also show that the performance of radiative cooling can be enhanced by inserting an Al2O3 film (which has strong absorption in the 8–13 µm spectrum, and does not absorb in the visible and near-infrared) within conventional coating structures. These two approaches enhance the cooling power of passive radiative cooling systems from the typical reported values of 40 W/m2–100 W/m2 and 65 W/m2 levels respectively.

DOI 10.1016/j.jqsrt.2017.03.046

Cilt 198