研究目的
To explore the radiative cooling and solar heating potential of several materials for the built environment based on their spectrally-selective properties.
研究成果
Moss was identified as the best candidate for radiative cooling due to its high spectral emissivity in the atmospheric window and sustainable nature. PPC and painted PPC also showed good potential. The coupled analysis revealed that radiation transfer is more dominant in moss, making it suitable for building applications. Recommendations include using moss on better insulator surfaces for optimal performance.
研究不足
The study assumes negligible convective heat transfer for simplicity; optical properties of materials were not available in literature and had to be measured experimentally; the analysis is limited to specific materials and conditions, and real-world environmental factors like wind and humidity are not fully accounted for.
1：Experimental Design and Method Selection:
The study involved measuring spectral absorption/emission spectra using UV-Vis spectrophotometer and FTIR spectroscopy, and performing coupled radiation and conduction heat transfer analysis. Theoretical models included radiative energy balance equations and P1 approximation for radiative transfer equation.
2：Sample Selection and Data Sources:
Six materials were selected: XPS (Extruded Polystyrene Foam), Perlite Pumice Cement Composite (PPC), White Painted PPC, Black Membrane (EPDM rubber), Red Membrane (asphalt shingle), and Plant or Moss. Samples were prepared and characterized based on availability and sustainability.
3：List of Experimental Equipment and Materials:
UV-Visible-NIR Spectrophotometer (Shimadzu 3150), FTIR Spectrometer (Thermo-Nicolet iS10), materials listed in Table 1 including XPS, PPC, etc.
4：Experimental Procedures and Operational Workflow:
Spectral measurements were conducted using spectrophotometers; data were recorded at room temperature. Numerical simulations were performed in MATLAB for power of cooling and coupled heat transfer.
5：Data Analysis Methods:
Spectral data were analyzed to calculate emissivity and absorption coefficients; power of cooling was computed using radiative balance equations; coupled conduction-radiation problems were solved using stepwise gray box models.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
