With the advancement of global carbon neutrality, building integrated solar energy technology is an effective solution to carbon neutrality in the construction field. Solar energy is a multi-spectral composite energy source, including ultraviolet, visible and near-infrared.

Special Issue Background

With the advancement of global carbon neutrality , building integrated solar energy technology is an effective solution to carbon neutrality in the construction field. Solar energy is a multi-spectral composite energy source, including ultraviolet, visible and near-infrared. At the same time, as the main energy consumer, buildings need various types of energy, such as light, heat, and electricity, to provide comfortable living conditions. Therefore, "how to use the multi-spectral effects of solar energy to solve the multi-category energy needs of buildings (including air disinfection, lighting, electricity production and heating/refrigeration)" is a challenging issue in building integrated solar energy technology. Although the technology of solar multispectral utilization has made significant progress, it still faces many challenges. Therefore, it is crucial to promote the in-depth development of multispectral transformation technology in the field of architecture.

Special Issue Background

This special issue contains the latest research related to multispectral solar energy technology. There are 23 original articles, mainly divided into three parts: spectral segmentation technology and applications, full-spectral thermal collecting technology and daytime radiation refrigeration materials. Among them, 13 articles introduce the latest developments in spectral splitting technology and the photovoltaic /photothermal technology (used for heating, hydrogen production, Applications related to air purification and solar fuel) and smart windows (for photothermal decoupling); 4 articles focus on the design of composite nanoparticles for high-efficiency solar collector ; the remaining 6 articles show daytime radiation refrigeration materials with high reflectivity (0.3-2.5 μm ) in the solar spectrum and high emissivity (8-13 μm ) in the atmospheric window. The summary of this article is as follows:

To achieve the conversion of full-spectrum solar hydrogen production, Ma uses a Pt-loaded TiO2 nanoparticle suspension as a photothermal hydrogen catalyst and an optical liquid filter for spectroscopy, and connects GaInP/GaAs/Ge trijunction solar cell to the electrolytic cell. Xia proposed a PV/T-driven liquid-photocatalytic-purification multifunctional system, and studied the effects of the concentration, thickness and bubble rate of the TiO2 nanofluid layer on the electrodissolution and photocatalytic oxidation of formaldehyde in the room.

Sun developed a predictive control strategy for electrochromic glass to bridge the gap between visual and thermal environment requirements during the cooling season. Wang proposed a new system for integrated film reactors for photovoltaic modules, using spectral separation technology to improve the overall efficiency of fuel and electricity. Chiang proposed a polyaniline reducing graphene oxide (PANI/rGO) nanocomposite electrocatalytic layer (with high light transmittance and good electrocatalytic performance), replacing the traditional platinum-based electrochromic window and improving the optical performance of smart windows. Bai and He developed a thermal response smart window based on hydroxypropyl cellulose (HPC) and studied the influence of nonionic surfactants on the optical properties of HPC. Gu uses tin antimony oxide (ATO) nanofluid as an optical filter to achieve sunshade of the underground ice rink without affecting indoor lighting.

Zhang has developed a frequency-dividing PV/T system to cope with the changing outdoor environment and realizes flexible thermal/electrical production capacity mode switching. Kandil studied the thermoelectric capacity of the concentrated frequency-dividing PV/T system, and discussed the impact of cutoff wavelength on temperature distribution and maximum allowable concentration ratio of non-cooling systems. Huang proposed a new type of solar concentrated photovoltaic and near-field thermal photovoltaic hybrid system (CPV-NFTPVS), which is based on the cascade utilization of full-spectrum solar energy to achieve efficient solar power generation. Shen conducted a numerical study of the radiation, photometric and chromatic properties of four different thermal discoloration windows and discussed the color shift and temperature rise caused by uneven transmission and absorption of the solar spectrum. Huang evaluated the stability and optical characteristics of a frequency-dividing photovoltaic/photothermal (PV/T) system based on Ag@SiO2. Wang and Narayan proposed a new solar-thermal regulation technology, using a porous polytetrafluoroethylene (PTFE) layer with a spectral selective absorber to dynamically switch optical characteristics and flexibly respond to building hot and cold needs.

Wen prepared TiN@SiCw binary composite nanoparticles by coupling agent method, and conducted numerical research on the optical coupled absorption characteristics of TiN and SiCw nanoparticles to improve their photothermal efficiency. Qin discusses the optical properties of nanospheres, nanorods, core/shell nanoparticles and star nanoparticles to enhance local surface plasma resonance (LSPR). Sun proposed a core-shell composite nanorod and studied its optical properties, emphasizing its potential in improving solar energy absorption efficiency. Yu introduced an optically selective aerogel that achieves optical selectivity and expands its application prospects by incorporating gold/silver nanoparticles.

Dong uses the spectrum band complementary method to propose a mixed coating of BaSO4, CaCO3 and SiO2 particles, achieving high reflectivity in the solar band, and demonstrating the cooling performance of the passive daytime radiation refrigeration coating. Yu proposed to break glass bubbles based on the ball milling method to improve the reflectivity of sunlight and the cooling performance of radiation refrigeration coatings. Feng studied the actual cooling performance of long-wave radiation coating in Chongqing. Zhang proposed a low-cost, popularizable composite film with a novel dendritic cell structure and discussed its radiation cooling properties. Zhao designed a microgate photon cooler based on silica and experimentally discussed its dynamic cooling characteristics. Finally, Hu proposed a ZnO-coated transparent wood (CTW) composite using a pure solution-based ultrasonic chemical synthesis method, which gave it a high emissivity (∼0.91) throughout the infrared band.

https://www.sciencedirect.com/science/article/pii/S0960148122018195?via%3Dihub=

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