|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.39 [2010] >
IJRSP Vol.39(3) [June 2010] >
| Title: | Evaluating the performance of some predictive models for estimating global solar radiation across varying climatic conditions in Nigeria |
| Authors: | Ogolo, E O |
| Keywords: | Performance indicators
Solar radiation
Regression analysis
Sunshine hour dependent model
Temperature dependent model
Angstrom type model |
| Issue Date: | Jun-2010 |
| Publisher: | CSIR |
| PACS No.: | 92.60.Vb; 94.20.wq |
| Abstract: |
The performance of both temperature and sunshine dependent models
were evaluated for different selected tropical sites, which are situated across
four different climatic zones, viz. Sahelian, Guinea Savannah, Midland
and Coastal area in Nigeria.
The regression constants were obtained for the first, second and third order
Angstrom type [Garcia J V, Principios
F’isicos de la Climatolog’ia. Ediciones UNALM (Universidad Nacional Agraria
La Molina: Lima, Peru), 1994; Hargreaves G &
Samani Z, Estimating potential evapotranspiration, J Irrigat Drainage Eng (USA), 108 (1982) pp 225-230] models for all
the stations using the method of regression analysis. Model evaluation
performance analyses were carried out to determine which model is more suitable
for a given climatic condition. The results indicated that the third order
Angstrom type correlations do not improve the accuracy of estimation of global
radiation. In addition, the results also revealed that temperature and sunshine
hour dependent models are more suitable for the simulation of global radiation
in the Sahelian and Guinea Savannah climatic condition, respectively. All the
models exhibited the tendency to perform suitably well in the Midland and Coastal areas. On the seasonal
consideration, the sunshine hour dependent models were found more suitable for
the estimation of solar global radiation across all the varying climatic
conditions during the dry season. However, all the models were found suitable
during the wet season except for the Sahelian where only the temperature
dependent models have been found exclusively suitable.
|
| Page(s): | 121-131 |
| ISSN: | 0975-105X (Online); 0367-8393 (Print) |
| Source: | IJRSP Vol.39(3) [June 2010]
|
|
