Results 231 to 240 of about 2,217 (261)
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A probability density function for the clearness index, with applications
Solar Energy, 1983Abstract This paper uses classical probability theory to derive expressions for the expected (or mean) value of quantities such as the irradiation on inclined surfaces, collector output, and net gain through windows. The random variables are the clearness index kt and the diffuse fraction k, whose means are k t and k , respectively ...
K.G.T. Hollands, R.G. Huget
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Spatial and Temporal Variation of Clearness Index in Iraq
Jordan Journal of Physics, 2021Abstract: This study deals with the spatial and temporal variation of clearness index (KT) in different meteorological stations, well distributed in Iraq, during the period between 1995 and 2015. The results indicate that the clearness index varies with the geographical location and period of the year.
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Analytic Formula for the Clear‐sky UV Index
Photochemistry and Photobiology, 2007AbstractAn approximate formula for the UV Index (UVI) under cloud‐free, unpolluted, low surface albedo conditions is: image where μo is the cosine of the solar zenith angle and Ω is the total vertical ozone column (in Dobson Units, DU). The dependence on μo and Ω is based on a simple physical model of biologically weighted atmospheric transmission in
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2016
Kt/V for urea (Kt/V) is a dimensionless clinical index of dialysis dose; however, it does not directly reflect the removal capacity of the solute. Since the total amount of solute removal, M, is directly proportional to the initial solute concentration CB(0), it is reasonable to introduce an index by dividing M by CB(0).
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Kt/V for urea (Kt/V) is a dimensionless clinical index of dialysis dose; however, it does not directly reflect the removal capacity of the solute. Since the total amount of solute removal, M, is directly proportional to the initial solute concentration CB(0), it is reasonable to introduce an index by dividing M by CB(0).
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Renewable Energy, 1995
Abstract Total (global) solar radiation, H, and diffuse solar radiation, Hd were measured at Ilorin (8° 30′N 4° 42′E) Nigeria. From these, the daily values of H H 0 and H d H were computed, where H0 is the extraterrestrial radiation.
E.B. Babatunde, T.O. Aro
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Abstract Total (global) solar radiation, H, and diffuse solar radiation, Hd were measured at Ilorin (8° 30′N 4° 42′E) Nigeria. From these, the daily values of H H 0 and H d H were computed, where H0 is the extraterrestrial radiation.
E.B. Babatunde, T.O. Aro
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Dynamics of Clear Sky Index of Solar Insolation
Volume 3: Advances in Thermal Technologies; Advances in Semiconductor Manufacturing; Clean Energy Technologies & Systems; Cyber Physical Systems + AI / MLAbstract Understanding the variability of solar energy is essential for optimizing energy resource planning and utilization. This study investigates the clear sky index k (the ratio of actual insolation to ideal clear-sky insolation) using satellite-derived real-sky data (INSAT-3D) and ideal-sky data computed through GRASS GIS, across
M. V. Suprabhat Prasad +1 more
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A derivation of the diffuse fraction's dependence on the clearness index
Solar Energy, 1985Abstract When averaged over many events having the same kt, the average diffuse fraction k carries an important quasi-universal functional dependence k (k t ) on the clearness index kt. This paper presents a theoretical derivation of k(kt).
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Generalized clearness index frequency curves for the Russian Federation
Doklady Physics, 2017Actinometric data of World Radiation Data Center and NASA POWER were used to get daily clearness index frequencies for Russia. The results obtained provide the opportunity to estimate more accurately the output of various types of solar power plants.
S. E. Frid +3 more
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Use of Clearness Indexes for Prediction of the Performance of PV Modules
2009Possibility of use of atmosphere clearness indexes kTm and corresponding with them diffuse component content indexes for prediction of the performance of PV modules in outdoor conditions were shown. Modules studied were carried out with different absorbers and using different technologies.
Rodziewicz, T. +2 more
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A new correlation between clearness index and relative sunshine
Renewable Energy, 1994Abstract A new correlation between the clearness index K t and the relative sunshine s/S is proposed for computing the monthly mean daily global radiation G (MJ m −2 day −1 ) at Italian locations. This equation is: K t = 0.67( s / S ) 0.45 (sin h n ) 0.05 0.15 ⩽ s / S ⩽ 0.90, where K t = G / G o ; G o (MJ m −2 day −1 ) and h
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