Effect of atmospheric humidity on radiation cooling

Harrison, A. W.

doi:10.1016/0038-092x(81)90209-7

Cited by 43 publications

(19 citation statements)

References 6 publications

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“…Brought to you by | MIT Libraries Authenticated Download Date | 5/9/18 9:30 AM transparency of the sky is quite sensitive to precipitable water vapor concentration, which is correlated with relative humidity (RH) and ground temperature [39,40], and thus varies geographically. Its influence is illustrated in Figure 2: higher precipitable water vapor concentration leads to stronger absorption within the atmospheric window.…”

Section: Tropospheric Temperature and Atmospheric Transmittancementioning

confidence: 99%

Radiative sky cooling: fundamental physics, materials, structures, and applications

et al. 2017

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Radiative sky cooling reduces the temperature of a system by promoting heat exchange with the sky; its key advantage is that no input energy is required. We will review the origins of radiative sky cooling from ancient times to the modern day, and illustrate how the fundamental physics of radiative cooling calls for a combination of properties that may not occur in bulk materials. A detailed comparison with recent modeling and experiments on nanophotonic structures will then illustrate the advantages of this recently emerging approach. Potential applications of these radiative cooling materials to a variety of temperature-sensitive optoelectronic devices, such as photovoltaics, thermophotovoltaics, rectennas, and infrared detectors, will then be discussed. This review will conclude by forecasting the prospects for the field as a whole in both terrestrial and space-based systems.

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Section: Tropospheric Temperature and Atmospheric Transmittancementioning

confidence: 99%

Radiative sky cooling: fundamental physics, materials, structures, and applications

et al. 2017

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“…[36][37][38] For atmospheric radiation, the atmospheric constituents like H 2 O, CO 2 , O 3 , CH 4 , and N 2 O contribute; however, for transmission within the atmospheric window, the major role is played by the H 2 O content within the atmosphere. [ 38,39 ] The amount of the water vapor content in the atmosphere can be associated to ground surface temperature and relative humidity (RH) or dew point. [37][38][39] Here, we will briefl y discuss the variation of the atmospheric transmittance for different locations and estimate the cooling potential for variable RH, assuming cloud-free sky conditions.…”

Section: Effects Of Atmospheric Conditionsmentioning

confidence: 99%

“…[ 38,39 ] The amount of the water vapor content in the atmosphere can be associated to ground surface temperature and relative humidity (RH) or dew point. [37][38][39] Here, we will briefl y discuss the variation of the atmospheric transmittance for different locations and estimate the cooling potential for variable RH, assuming cloud-free sky conditions. Figure 4 a shows the modeled atmospheric transmittance [ 28 ] for the ambient temperatures and mean RH during the peak daytime (3 pm) at summer (January, 2015) in two mid-latitude locations in Australia.…”

Section: Effects Of Atmospheric Conditionsmentioning

confidence: 99%

Radiative Cooling: Principles, Progress, and Potentials

2016

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The recent progress on radiative cooling reveals its potential for applications in highly efficient passive cooling. This approach utilizes the maximized emission of infrared thermal radiation through the atmospheric window for releasing heat and minimized absorption of incoming atmospheric radiation. These simultaneous processes can lead to a device temperature substantially below the ambient temperature. Although the application of radiative cooling for nighttime cooling was demonstrated a few decades ago, significant cooling under direct sunlight has been achieved only recently, indicating its potential as a practical passive cooler during the day. In this article, the basic principles of radiative cooling and its performance characteristics for nonradiative contributions, solar radiation, and atmospheric conditions are discussed. The recent advancements over the traditional approaches and their material and structural characteristics are outlined. The key characteristics of the thermal radiators and solar reflectors of the current state‐of‐the‐art radiative coolers are evaluated and their benchmarks are remarked for the peak cooling ability. The scopes for further improvements on radiative cooling efficiency for optimized device characteristics are also theoretically estimated.

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“…This has already been discussed in various earlier reports. [49][50][51][52] To minimize the effects of incoming solar radiation, an IR transparent reflector needs to be integrated on the top side of the surface. Alternatively, a cooling device itself can be designed that possesses the capability to serve as both solar reflector and IR radiator simultaneously.…”

Section: Design Principle Of Passive Radiative Coolermentioning

confidence: 99%

Recent advances and progresses in photonic devices for passive radiative cooling application: a review

Goyal

Kumar

2020

J. Nanophoton.

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This review covers the recent progress made in the nanophotonic devices-based daytime passive radiative coolers. The radiative cooling capabilities along with the structural description of various natural species are discussed. The design principle along with key characteristics of the omnidirectional solar reflectors as well as thermal adiators is discussed in detail. Several analogues planner one-dimensional and two-dimensional photonic nanostructures and their current state-of-the-art techniques have been discussed. For each kind of the photonic structure, the novelty, measurement principle, and their respective daytime radiative cooling capability are presented. The reported works and the corresponding results predict the possibility to realize an efficient and commercially viable radiator for passive radiative cooling applications.

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Effect of atmospheric humidity on radiation cooling

Cited by 43 publications

References 6 publications

Radiative sky cooling: fundamental physics, materials, structures, and applications

Radiative sky cooling: fundamental physics, materials, structures, and applications

Radiative Cooling: Principles, Progress, and Potentials

Recent advances and progresses in photonic devices for passive radiative cooling application: a review

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