Dataset with transmittance values in solar panel coverings for the components of anisotropic radiation, and power estimations for two locations, three panel inclinations, two sky models, and three sets of covering specifications
Description
This dataset is, or eventually will be, associated with a research paper. The paper proposes a new set of general models for estimating the transmittance in solar panel coverings of the anisotropic component of diffuse radiation, namely, Sky Isotropic, Circumsolar, Horizon Brightening, and Albedo. The Sky Isotropic radiation consists of rays coming (unbiased) from all directions of a virtual dome, the Circumsolar radiation as rays coming from a 25° half-angle spherical cone following the sun, the Horizon Brightening radiation as rays coming from either a flat ring or a 6.5° spherical segment (band) at the horizon, and ground-reflected Albedo as a downward extension of the Sky Isotropic dome. The proposed models are in function of the Beam Incidence Angle (in [rad]), the panel Tilt Angle (in [rad]), the covering Thickness (L in [m]), the covering Refraction Index (n), and the covering Extinction Coefficient (K in [1/m]). Four files are related to these models. The rest of the files correspond to a case study related to the same paper, where detailed calculations are presented for half-hourly time steps throughout the whole 2018 year for two locations (Pittsburgh, United States, and Santa Marta, Colombia), three south-facing panel inclinations (0°, 90°, and counter-latitude), two sky models (HDKR, 1990, and Perez, 1990), and three sets of covering specifications (low range, Default, and high range). Meteorological data were obtained for both locations from The National Solar Radiation Database (NSRDB), which includes values for the Horizontal Global Irradiance, Horizontal Diffuse Irradiance, Ambient Temperature, Relative Humidity, and Wind Speed. The sets of covering specifications were taken from similar studies reporting values that are often used: low range (L: 0.001, K: 4, n: 1.34), Default (L: 0.002, K: 4, n: 1.526), and high range (L: 0.004, K: 32, n: 1.6).
Files
Steps to reproduce
In relation to the transmittance models, there are four comma-separated files presenting the transmittance values calculated for every degree of beam incidence or panel tilt and for different combinations of L, K, and n: “SkyIsotropic_Transmittance”, “HorizonBrightening_Ring_Transmittance”, “HorizonBrightening_Band_Transmittance”, and “Circumsolar_Transmittance”. The comma-separated files from the case study calculations, which use the proposed transmittance models, include the following variables: Year, Month, Day, Hour (civil time), Solar Time (in [h]), Zenith (in [deg]), Azimuth (from North, in [deg]), Incidence Angle (in [deg]), Horizontal Extraterrestrial Irradiance, Horizontal Beam Irradiance, Horizontal Diffuse Irradiance, Clearness Index, Relative Humidity (in [%]), Wind Speed (in[m/s]), Absolute Air Mass, Air Mass Modifier, Cloud Coverage (from 0-1), Ambient Temperature, Dewpoint Temperature, Sky Temperature, Incident Beam Irradiance, Incident Circumsolar Irradiance, Incident Sky Isotropic Irradiance, Incident Albedo Irradiance, Incident Horizon Brightening Irradiance, Transmittance of Beam radiation, Transmittance of the Circumsolar radiation, Transmittance of the Sky Isotropic radiation, Transmittance of the Albedo radiation, Transmittance of the Horizon Brightening radiation, Total Transmitted Irradiance, Total Transmittance, Total Absorptance, Covering Temperature, PV Temperature, PV Efficiency, and PV Power (in [W/m^2]). All temperatures in these files are in [°C] and irradiances in [W/m^2]. The file names indicate the location, panel tilt angle, sky model used, and the covering specifications.