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Making Paint Cool in the Face of Heat

Gizmodo chats with Purdue Mechanical Engineering Professor Xiulin Ruan on creating super-reflective white paints. ....

Xiulin Ruan , Heat Transfer , Radiative Cooling ,

"Development of spectrally self-switchable cover with phase change mate" by Weiguang Su, Ruigeng Kang et al.

Radiative cooling promises an effective strategy against global warming by sending waste heat to the deep universe in a passive manner. However, the mismatch between cooling supply and demand can significantly compromise the efficacy of spectrally-static radiative cooling devices in cold weather. Therefore, the present work introduced paraffin wax as the phase change material (PCM) to develop a spectrally self-switchable cover (SSC) for flexible radiative cooling. The transmittance of the paraffin wax at different temperatures, thicknesses and phases was characterized. In the UV-VIS-NIR band, the transmittance of the paraffin wax was over 90% in the liquid phase but below 5% in the solid phase. In the “atmospheric window” band, the transmission of the paraffin wax in the liquid phase was also much higher than that in the solid phase with a maximum difference of 41.1%. The optical constants of various paraffin waxes in solid and liquid phases were calculated according to the two-thi ....

Phase Change Material , Radiative Cooling , Elf Switchable Cover , Emperature Adaptive ,

Photovoltaic-thermoelectric tech with potential efficiency of 65%

Chinese scientists have simulated a new photovoltaic-thermoelectric technology, based on radiative cooling and III-V solar cells, to generate electricity at night. ....

United States , Jianfeng Guo , Purdue University , Shanghai Jiao Tong University , Catalan Institute Of Nanoscience , Chinese Academy Of Science , Jordan University Of Science , Australian College Of Kuwait , Chinese Academy , Electric Power , Radiative Cooling , Catalan Institute , Instituto De Ciencia Materiales , Jordan University , Australian College ,

Lightweight hBN Nanoporous Paint with Excellent Cooling Abilities

A recent study published in the journal Cell Reports Physical Science addresses this issue by fabricating a lightweight and ultrawhite nanoporous paint using hexagonal boron nitride (hBN) for daytime radiative cooling applications. ....

Us Energy Department , Excellent Cooling , Cell Reports Physical Science , Radiative Cooling , Lightweight Radiative Cooling , Key Developments , Reports Physical ,

"Development of temperature-responsive transmission switch film (TRTSF)" by Weiguang Su, Pei Cai et al.

To overcome the problem of unable automatic turn on and off response to the ambient temperature of current static radiative cooling systems, we prepared a series of temperature-responsive transmission switch film (TRTSF) samples using n-octadecane as phase change material (PCM) and polydimethylsiloxane (PDMS) as carrier material. The phase change cycle permeability analysis showed that the TRTSF samples with PCM content above 30.0 w.t.% exhibit a serious leakage problem due to a large number of holes on surface. The TRTSF samples with 10.0–30.0 w.t.% PCM content were further analysed by Differential scanning calorimetry (DSC) and Thermogravimetry (TG), and compared with the theoretical PCM contents, which verified the reliability of the curing results of PCM in TRTSF from various aspects. The ultraviolet–visible light-near-infrared (UV–VIS-NIR) and mid-infrared (MIR) transmittance characterization of TRTSF revealed that the switching effect was obvious during solid–liquid phase ....

Form Stable Phase Change Material , Radiative Cooling , Emperature Responsive , Thermal Properties , Transmission Switch ,