Field test and preliminary analysis of a combined diurnal solar heating and nocturnal radiative cooling system

Hu, Mingke; Pei, Gang; Wang, Qiliang; Li, Jing; Wang, Yunyun; Ji, Jie

doi:10.1016/j.apenergy.2016.07.066

Cited by 116 publications

(51 citation statements)

References 37 publications

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“…The results are displayed in two separate categories: power delivered at the radiator and power delivered at the room. The results for the maximum values of power delivered at the radiator during the cooling season show similar outcomes as Hu, et al [2016] found in their study (Net cooling power for a clear night sky using a radiative cooling collector of 20-80 W/m 2 and their solar heating and radiative cooling collector having a net cooling power for a clear sky of 50.3 W/m 2 ).…”

Section: Resultssupporting

confidence: 83%

All season heat pipe system.

Parsons¹

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This was only possible because of him. Thank you for believing in me. Next, my parents Scott and Connie, they gave me the drive, knowledge and confidence to become an engineer. Without my foundation in learning, I would not have been able to persist. Also, many thanks to those in the Engineering Fundamentals Department who continually endorsed me, helped me and mentored me throughout this process. Finally, I want to thank my daughter, Madalyn. I hope I make you proud.

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Section: Resultssupporting

confidence: 83%

All season heat pipe system.

Parsons¹

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“…We first provide the experimental results as measured from the UV-Visible spectrophotometer and FTIR spectroscopy, which correspond to the solar window of 0.2-2 µm and the atmospheric window of 8-13 µm wavelength intervals. A system with high emissivity in both solar radiation and atmospheric window bands can act as a solar heating system during daytime, and also a radiative cooling system at night time [49,50]. It is effectively an ideal surface for this application; its expected spectrum is shown in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces

Family¹,

Mengüç²

2018

Sustainability

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The main goal of this paper is to explore the radiative cooling and solar heating potential of several materials for the built environment, based on their spectrally-selective properties. A material for solar heating, should have high spectral emissivity/absorptivity in the solar radiation band (within the wavelength range of 0.2–2 μm), and low emissivity/absorptivity at longer wavelengths. Radiative cooling applications require high spectral emissivity/absorptivity, within the atmospheric window band (8–13 μm), and a low emissivity/absorptivity in other bands. UV-Vis spectrophotometer and FTIR spectroscopy, are used to measure, the spectral absorption/emission spectra of six different types of materials. To evaluate the radiative cooling potential of the samples, the power of cooling is calculated. Heat transfer through most materials is not just a surface phenomenon, but it also needs a volumetric analysis. Therefore, a coupled radiation and conduction heat transfer analysis is used. Results are discussed for the selection of the best materials, for different applications on building surfaces.

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“…However, this material will also emit in the atmospheric window band during solar radiation collection, which can diminish the heat collection. Moreover, Hu et al did not consider the radiative properties of the cover of the solar collector/radiative cooler, using polyethylene as cover, which will reduce the efficiency during solar collection mode due to the high emissivity in the near-infrared wavelength [39].…”

Section: Introductionmentioning

confidence: 99%

Combined Radiative Cooling and Solar Thermal Collection: Experimental Proof of Concept

et al. 2020

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Climate change is becoming more important day after day. The main actor to decarbonize the economy is the building stock, especially in the energy used for Domestic Hot Water (DHW), heating and cooling. The use of renewable energy sources to cover space conditioning and DHW demands is growing every year. While solar thermal energy can cover building heating and DHW demands, there is no technology with such potential and development for space cooling. In this paper, a new concept of combining radiative cooling and solar thermal collection, the Radiative Collector and Emitter (RCE), through the idea of an adaptive cover, which uses different material properties for each functionality, is for the first time experimentally tested and proved. The RCE relies on an adaptive cover that uses different material properties for each functionality: high spectral transmittance in the solar radiation band and very low spectral transmittance in the infrared band during solar collection mode, and high spectral transmittance in the atmospheric window wavelength during radiative cooling mode. Experiments were performed during the summer period in Lleida (Dry Mediterranean Continental climate). The concept was proved, demonstrating the potential of the RCE to heat up water during daylight hours and to cool down water during the night. Daily/nightly average efficiencies up to 49% and 32% were achieved for solar collection and radiative cooling, respectively.

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Field test and preliminary analysis of a combined diurnal solar heating and nocturnal radiative cooling system

Cited by 116 publications

References 37 publications

All season heat pipe system.

All season heat pipe system.

Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces

Combined Radiative Cooling and Solar Thermal Collection: Experimental Proof of Concept

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