Radiative cooling for solar cells

Zhu, Linxiao; Raman, Aaswath; Wang, Ken X.; Anoma, Marc Abou; Fan, Shanhui

doi:10.1117/12.2080148

Cited by 41 publications

(50 citation statements)

References 28 publications

(3 reference statements)

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“…The study of radiative cooling has a long history123456789101112131415161718192021. It has been well known since ancient times, that a black radiator facing a clear night sky can reach sub-ambient temperature16.…”

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confidence: 99%

Radiative cooling to deep sub-freezing temperatures through a 24-h day–night cycle

et al. 2016

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Radiative cooling technology utilizes the atmospheric transparency window (8–13 μm) to passively dissipate heat from Earth into outer space (3 K). This technology has attracted broad interests from both fundamental sciences and real world applications, ranging from passive building cooling, renewable energy harvesting and passive refrigeration in arid regions. However, the temperature reduction experimentally demonstrated, thus far, has been relatively modest. Here we theoretically show that ultra-large temperature reduction for as much as 60 °C from ambient is achievable by using a selective thermal emitter and by eliminating parasitic thermal load, and experimentally demonstrate a temperature reduction that far exceeds previous works. In a populous area at sea level, we have achieved an average temperature reduction of 37 °C from the ambient air temperature through a 24-h day–night cycle, with a maximal reduction of 42 °C that occurs when the experimental set-up enclosing the emitter is exposed to peak solar irradiance.

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confidence: 99%

Radiative cooling to deep sub-freezing temperatures through a 24-h day–night cycle

et al. 2016

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“…The published results showed that the cooling power rate was 100 W/m 2 at ambient temperature . The measured temperature reduction is 13 °C by the radiative cooling as shown in , while the theoretical potential of the radiation‐induced temperature reduction is 18.3 °C as reported in . Although it is a self‐cooling technology, the cooling power by radiation is not as large as that in active cooling systems and may not be sufficient for some of the cooling applications.…”

Section: Introductionmentioning

confidence: 96%

“…Passive cooling by thermal radiation was investigated by Fan et al . By incorporating nanodomes on solar cells, the thermal energy can be radiated to the outer space because the atmosphere is transparent to the electromagnetic spectrum in the wavelengths of 8–13 µm.…”

Section: Introductionmentioning

confidence: 99%

Thermal management of solar cells using a nano-coated heat pipe plate: an indoor experimental study

Chen

et al. 2016

Int. J. Energy Res.

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Summary With temperature increasing, the photovoltaic efficiency of solar cells is reduced significantly. Such an efficiency loss may offset the efficiency improvement because of the development of the photovoltaic technology. This paper provides a novel approach for efficiency loss recovery of solar cells. Specifically, a nano‐coated heat pipe plate was integrated with the solar panel to remove heat from the hotspots on solar cells. This study concerns the indoor experiments of a commercial solar cell thermally managed with a heat pipe plate. The temperature rise and non‐uniformity on the solar panel were quantified in different light irradiances. With thermal management by the heat pipe plate, the solar panel shows a temperature‐rise reduction of 47–50%. This implies that half of the efficiency loss of the solar cell can be recovered. In addition, the temperature variation within the solar panel is reduced to 1.0–2.5 °C, which is beneficial in prolonging the longevity of the solar cell. In the experiments, the heat pipe plate can provide a cooling flux of 380 W/m2 with light irradiance below 1000 W/m2. By incorporating the heat pipe plate with a water jacket, the heat removal flux could be improved to 600 W/m2, leading to a solar cell temperature of a few degrees higher than the ambient. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Losses in the form of heat in the solar cell cause an increase in the temperature of the PV module, which reduces the electrical efficiency, increasing the saturation current of this module. Therefore, each degree above the Nominal Operating Cell Temperature (NOCT) corresponds to 0.45% decrease in cell efficiency [4] for the polycrystalline silicon module used [5]. NOCT corresponds to 45ºC (± 2ºC) for the module, however it is necessary to observe the datasheet of the module as it varies according to the PV technology used by the manufacturer.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of photovoltaic modules center and edge temperature using IoT embedded system

Pereira¹,

Jucá²,

Carvalho³

et al. 2019

REPQJ

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The main objective of this project is to develop and implement an Internet of Things (IoT) monitoring system to analyze the temperature at the center and at the edge of gridconnected photovoltaic (PV) modules at Maracanaú -CE, Brazil. The proposed IoT embedded system is based on free software and hardware using ESP 32 development board, allowing online distribution, free usage and communication with a server in the Cloud wirelessly via WiFi. The use of open source and cross-platform (Linux, Windows® and Mac OSX) allows greater interaction and accessibility to the user. A web page called Web Monitor was developed for online data consulting and for real-time monitoring of the PV temperature. Monitoring individual PV modules has the objective of providing data for the analysis of electricity generation efficiency and for fault detection in case of PV cells overheating. Meteorological data such as solar irradiance, ambient temperature, relative humidity and wind speed were also measured and monitored to allow a more complete analysis of the effect of these variables on the module temperature response. According to the results, the PV module edge temperature is 1.5 to 2ºC lower than the center temperature.

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Radiative cooling for solar cells

Cited by 41 publications

References 28 publications

Radiative cooling to deep sub-freezing temperatures through a 24-h day–night cycle

Radiative cooling to deep sub-freezing temperatures through a 24-h day–night cycle

Thermal management of solar cells using a nano-coated heat pipe plate: an indoor experimental study

Comparative analysis of photovoltaic modules center and edge temperature using IoT embedded system

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