Selective covers for natural cooling devices

Addeo, Alfredo; Monza, E.; Peraldo, M.; Bartoli, B.; Coluzzi, B.; Silvestrini, V.; Troise, G.

doi:10.1007/bf02507668

Cited by 41 publications

(16 citation statements)

References 2 publications

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“…Equations (11) and (12) are in agreement with our earlier work [28,29] and with that of others [8,10] but disagree with those of Landro and McCormick [17]. It is difficult to assess the acc·uracy of their Eq.…”

Section: J [ T C ( E :A-) E C·( E :A-) R R ( E :A-) ] Ec(e:a-) +supporting

confidence: 69%

“…With these assumptions and definitions, the net radiative heat loss N of the radiator, at equilibrium, is given by ( 11) ·The denominators in this equation arise from multiple reflections between cover and radiator. The temperature of the cover, T , is determined from the cover heat balance assuming it has zero cheat capacity:…”

Section: Heat Exchange With a Covered Radiatormentioning

confidence: 99%

“…It represents the cooling power available because the radiative 11 temperature.. of the sky is 1 ower than the air temperature. Note that € (8,A) = 1 except for A in the 8 to 13 micron window.…”

mentioning

confidence: 99%

“…Thus it ;I only the [8][9][10][11][12][13] micrrin values of €r(e,A) which are important in this term. The second term in Eq.…”

mentioning

confidence: 99%

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Thermal performance of radiative cooling panels

Berdahl

Martin

Sakkal

1983

International Journal of Heat and Mass Transfer

148

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Section: J [ T C ( E :A-) E C·( E :A-) R R ( E :A-) ] Ec(e:a-) +supporting

confidence: 69%

Section: Heat Exchange With a Covered Radiatormentioning

confidence: 99%

See 2 more Smart Citations

Thermal performance of radiative cooling panels

Berdahl

Martin

Sakkal

1983

International Journal of Heat and Mass Transfer

148

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“…Therefore, the surface must be isolated from the environment. This is accomplished by insulating the bottom and sides of the radiator surface and covering the top with an infrared transparent film (windscreen) [7,8]. The entire assembly will be referred to as a radiator panel.…”

Section: Principles Of Radiative Coolingmentioning

confidence: 99%

Radiative cooling test facility and performance evaluation of 4-MIL aluminized polyvinyl fluoride and white-paint surfaces

Kruskopf¹,

Berdahl²,

Martin³

et al. 1980

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Surfaces exposed to the night sky cool to temperatures below that of the air.This cooling is due to the nature of the atmospheric thermal radiation. Materials with dissimilar spectral characteristics behave differently.The purpose of the Radiative Cooling Test Facility is to provide a means for quantitative measurement of the cooling rates of exposed surfaces and assemblies. Emphasis is placed upon assemblies which are specifically designed to produce radiative cooling and which therefore offer promise for the reduction of temperatures and/or humidities in occupied spaces.This report documents the hardware and software used to operate the facility, and presents the results of the first comprehensive experiments.A microcomputer-based control/data acqu~s~t~on system was employed to study the performance of two prototype radiator surfaces: 4 mil aluminized polyvinyl fluoride (PVF) and white painted surfaces set f Current Address:American University, Beirut, Lebanon. Princeton University, Princeton, NJ 08540.below polyethylene windscreens.The tested were determined and can be equation Computer simulations of radiative cooling assemblies were used to confirm that, with proper measurement techniques, the measured values of the constants a and b are nearly independent of the magnitudes of wind speed, air temperature, and sky radiance. Thus the cooling performance equation given in this abstract is applicable to a wide range of conditions, requiring only the sky radiance and the absolute air and surface temperatures as input values.-2-CONTENTS

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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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Selective covers for natural cooling devices

Cited by 41 publications

References 2 publications

Thermal performance of radiative cooling panels

Thermal performance of radiative cooling panels

Radiative cooling test facility and performance evaluation of 4-MIL aluminized polyvinyl fluoride and white-paint surfaces

Radiative Cooling: Principles, Progress, and Potentials

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