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Solar Spectrum Reflectometer Measurements on Profiled and
Solar reflectance is one of the key parameters, together with thermal emissivity, to assess performance of solar reflective materials. Among the most used …
Recent advances in organic solar cells: materials, design, and …
Organic solar cells have emerged as promising alternatives to traditional inorganic solar cells due to their low cost, flexibility, and tunable properties. This mini review introduces a novel perspective on recent advancements in organic solar cells, providing an overview of the latest developments in materials, device architecture, and performance …
Optimal Design of Advanced Reflectivity Control Device for Solar …
trol device using the solar radiation pressure (SRP).1) This de-vice is thin-film-shaped. The RCD reflects sunlight diffusively and specularly, when the device is ON and OFF states, respec-tively. By using this difference of reflectivity, we can control the SRP that ...
A review of using reflective pavement materials as mitigation tactics …
When the solar reflectivity increases, more solar radiation can be transported into the adjacent buildings via windows, which has the possibility of increasing the energy use in buildings. A study demonstrated that the annual cooling loads in a four-layer office building increase by 11% (33.1 kWh/m 2 ) with the solar reflectance enhanced …
Reducing reflectivity in solar cells and optics with micro
Lawrence Livermore National Laboratory (LLNL) researchers have come up with guidelines for an alternative to anti-reflective coatings on optical devices such as …
Towards a bright future: The versatile applications of organic solar cells …
The versatile applications of organic solar cells - ScienceDirect
Cool ceramics
The ceramic has a densely-packed outer layer and an inner layer with numerous internal voids that affords high solar reflectivity of 99.6% and high emissivity in the atmospheric window. These ...
410-Solar Visible / NIR Portable Reflectometer
The 410-Solar is a battery operated portable reflectometer, the ideal tool for field solar reflectance, solar absorbtance measurements and mirror …
Development and performance testing of reflector materials for concentrated solar power…
The reflectivity of stainless steel is lower; it limits the stainless steel used as a solar reflector. The glass mirror and aluminium are the main candidate material for the solar reflector. Reflectivity, durability and cost are …
Solar Sail Halo Orbit Control using Reflectivity Control …
The reflectivity control device, initially developed for attitude control, is utilized to control the solar sail orbit by switching the states between absorption and specular reflection.
Albedo and Reflectivity
Albedo is the percentage of solar radiation reflected by an object. The term is derived from the Latin albus, white.A pure white object would reflect all radiation that impinges on it and have an albedo of 100%. A pure black object would absorb all radiation and have an ...
Dynamics and control of flexible spinning solar sails under reflectivity …
Reflectivity control device Nomenclature a S solar radiation pressure acceleration, km/s 2 A area of the solar sail, m 2 C a, C d, C s ... Especially for a spinning solar sail, reflectivity modulation is preferable than other control mechanisms, such as control vanes, ...
Standardizing the Thermodynamic Definition of Daytime …
Daytime and nighttime radiative cooling has emerged as a highly promising and versatile technology with broad applications across various sectors, including building energy management, renewable energy systems, and environmental sustainability. Grounded in the principles of radiative heat transfer, radiative cooling harnesses the …
IKAROS (Interplanetary Kite-craft Accelerated by …
13) Ryu Funase, Yoji Shirasawa, Yuya Mimasu, Osamu Mori, Yuichi Tsuda, Takanao Saiki, Junichiro Kawaguchi, "Fuel-free and Oscillation-free Attitude Control of IKAROS Solar Sail Spacecraft Using …
Standardizing the Thermodynamic Definition of Daytime …
We further discuss the working condition of a subambient radiative cooler and the influence from convective/conductive loss in Figure 2B.The intercepts on the x-axis are the theoretical maximum temperature drop ΔT max that the ultrareflective emitter can achieve. that the ultrareflective emitter can achieve.
Optimal Design of Advanced Reflectivity Control Device for Solar …
The Reflectivity Control Device (RCD) is the external momentum exchange device. The RCD can control the solar radiation pressure that the device obtains by changing the reflectivity. The device has a mirror on which polymer dispersed liquid crystal (PDLC) layer is attached . By changing the electric field in the PDLC layer, we can control the …
Device simulation of perovskite/silicon tandem solar cell with …
Optical design, photon management, and energy conversion efficiency are investigated through numerical simulation of perovskite/silicon tandem solar cell using the single-diode model. A strong near-infrared reflectance of roughly 60% is present in the perovskite-based top cell. ZnO and Si3N4 anti-reflection coating layers are placed on the …
Coupled Attitude–orbit Dynamics and Control of Reflectivity Modulated Solar …
Assume that the solar sail considered here is a spinning disk sail with a total area As and radius r s.The basic configuration of the sail is depicted in Fig. 1. Two reference coordinate frames are used to describe the configuration: One is a spin-free body frame oxyz
Reliably Measuring the Performance of Emerging Photovoltaic Solar …
Therefore the solar PCE of the PbS device is (correcting for the mismatch factor) 6.6 ± 0.6% and the solar PCE of the CsPbI 3 is 6.8 ± 0.6%. The short circuit currents measured from integrating the EQE data are 21.5 mA cm −2 for the PbS device and 11.1 mA cm −2 for the CsPbI 3 device.
Design and Preparation of Anti-Reflection Nanoarray Structure on the Surface of Space Solar …
Space solar cell glass covers require high radiation resistance and wide-spectrum high light transmittance. The existing research on the preparation of thin films or special optical structures on the surface of solar cells rarely involves systematic research and the precise control of the high transmittance structural parameters of specific spectral …
Toward the Scaling up of Daytime Radiative Coolers: A Review
Their DRC demonstrated a solar reflectivity of 0.98 and emissivity higher than 0.7 within the atmospheric window (8–13 µm). The outdoor experiment showed a subambient cooling effect up to 8 °C, which is among the highest with respect to a selective DRC, and was ascribed to the combination of silica and silicon nitride layers.
Optimal Design of Advanced Reflectivity Control Device for Solar …
Fig. 5. ON and OFF states of LC molecule''s alignment in the droplets. The red arrows indicate the orientations of the droplets. - "Optimal Design of Advanced Reflectivity Control Device for Solar Sails Considering Polarization Properties of Liquid Crystal"
Coupled Control of Reflectivity Modulated Solar Sail for GeoSail …
The use of the electrochromic device has been proposed for the attitude control of spacecraft for decades because its optical characteristics can be altered by electrical excitation. The technology was recently employed and verified successfully on Interplanetary Kite Craft Accelerated by Radiation of the Sun, the world''s first interplanetary sailcraft. In …
410-Solar Visible / NIR Portable Reflectometer
Quickly and accurately collects solar reflectivity data necessary to calculate solar reflectance index (SRI) values for cool roofing and green building LEED certification. The SOC410-Solar conforms to ASTM E903, the standard test method for solar absorptance, reflectance, and transmittance of materials.
Solar Flux Measuring and Optical Efficiency Forecasting of the …
The linear Fresnel reflector concentrator (LFRC) is widely used in the field of solar energy utilization due to its simple structure, low cost, and excellent wind resistance. Nevertheless, the LFRC operates outdoors all year round, and the dust accumulation on the mirror will reduce the optical efficiency of the system, so it needs to be perfected and …
Solar Sail Halo Orbit Control using Reflectivity Control Devices
The reflectivity control device, initially developed for attitude control, is utilized to control the solar sail orbit by switching the states between absorption and specular reflection. The solar radiation pressure force of a solar sail equipped with reflectivity control devices is modeled, and can be changed continuously by adjusting a …