Hourly global and diffuse radiation of Lagos, Nigeria—Correlation with some atmospheric parameters

Chendo, M.A.C.; Maduekwe, A. A. L.

doi:10.1016/0038-092x(94)90491-x

Cited by 33 publications

(10 citation statements)

References 8 publications

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“…The dependence of K on other variables besides K t , such as solar elevation, water vapour, turbidity and climatic variables has been suggested by different authors (e.g. Garrison, 1985;Gueymard, 1989a;Reindl et al, 1990;Chendo and Maduekwe, 1994). According to its definition, K can be derived as…”

Section: Clearness Index (K T )mentioning

confidence: 98%

A Model to Estimate Global Radiation in Complex Terrain

Wang

Tenhunen

Schmidt

et al. 2006

Boundary-Layer Meteorol

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Global radiation is an important parameter necessary for most ecological models. However, in situ data barely meet the needs of modelling mountainous ecosystems since most field stations are located in flat areas. Consequently, it is usually necessary to extrapolate radiation measurements obtained from an adjacent flat area to the complex terrain of concern. The distribution of radiation in complex terrain depends upon two factors: the local atmospheric conditions, which determine the radiation potentially available to a supposed flat surface in a given location, and the topographic effects on this possible radiation. The latter have been included in detail in most radiation models for complex terrain, but the former are often only simply treated as constant or estimated by over-simplified empirical algorithms. In this paper we propose a novel approach that uses a parametric atmospheric model to calculate the potential radiation for a supposed flat surface in a given location, and then account for topographic effects. Direct radiation, diffuse radiation and reflected radiation are calculated separately in the model due to the distinctive characteristics of and the effects by topography. Based on the parametric model, we have investigated the relationship between radiation transmittance, clearness indices and altitude under a series of water vapour content and turbidity conditions. This combines three ratios, R b , R d , and R r , defined as the direct radiation, diffuse radiation and reflected radiation received by the arbitrary surface, respectively, to their counterparts in the horizontal surface, to estimate the global radiation for any given location. The model has been validated with measurements in National Park Berchtesgaden, Germany, where six measurement sites with various altitudes and topographic characteristics have been deployed. The r 2 of modelled and measured hourly global radiation are greater than 0.90 in all six sites, with RMSE varying from 16 to 100 W m −2 . Sensitivity analysis revealed that the model was not sensitive to change in water vapour content, which suggests the possibility to use an exponential algorithm of water vapour content when there is no in situ water vapour content information in complex terrains. The normalised RMSE was only reduced by 0.04, on average, in five of the six sites when water vapour content information was calculated from the in situ air temperature and relative humidity measurements.

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Section: Clearness Index (K T )mentioning

confidence: 98%

A Model to Estimate Global Radiation in Complex Terrain

Wang

Tenhunen

Schmidt

et al. 2006

Boundary-Layer Meteorol

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“…However, K t is neither zero nor unity. There is no clear-cut K t value to represent an overcast sky and di erent values have been adopted by di erent researchers [21,22]. Compared with K t , K needs both global and di use components.…”

Section: Solar Irradiancementioning

confidence: 99%

Overcast sky conditions and luminance distribution in Hong Kong

Lau

Lam

2004

Building and Environment

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“…The older works, i.e., Orgill and Holland and (1977) and Erbs et al (1982), correlate the diffuse fraction of solar irradiation with the clearness index that represents the portion of horizontal extra-terrestrial radiation reaching the surface. On the contrary, Chendo and Maduekwe (1994) introduced also the dependency to the solar altitude, while Perez et al (1992) proposed a modification to the DISC model introduced by Maxwell (1987) with the purpose of considering the dynamics effect in time series. Finally, Boland et al (2008), involved a logistic function instead of piecewise linear or simple nonlinear functions.…”

Section: Solar Irradiation Modelsmentioning

confidence: 99%

Impact of Solar Irradiation Models on Building Refurbishment Measures from Multi-Objective Optimization

Prada¹,

Pernigotto²,

Cappelletti³

et al. 2015

Building Simulation Conference Proceedings

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The European energy regulations encourage the refurbishment of existing buildings in order to ensure a reduction of the energy use. The choice of the optimal solutions is actually a trade-off problem between conflicting goals. For this reason, multiobjective optimization techniques can be coupled with building energy simulation (BES). However, even if validated BES codes are used, some discrepancies arise due to the accuracy of implemented models, such as those related to the elaboration of solar irradiation profiles. This research work investigates the extent to which the choice of solar irradiation models can affect the robustness of the Pareto front for several building configurations in two Italian climates. The results highlight the building characteristics reducing the robustness of Pareto front solutions. Nonetheless, the analysis shows a low sensitivity of cost and energy optimal solutions to the uncertainty introduced by solar models.

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Hourly global and diffuse radiation of Lagos, Nigeria—Correlation with some atmospheric parameters

Cited by 33 publications

References 8 publications

A Model to Estimate Global Radiation in Complex Terrain

A Model to Estimate Global Radiation in Complex Terrain

Overcast sky conditions and luminance distribution in Hong Kong

Impact of Solar Irradiation Models on Building Refurbishment Measures from Multi-Objective Optimization

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