Combination of Hargreaves method and linear regression as a new method to estimate solar radiation in Perlis, Northern Malaysia

Ismail, Daut; Irwanto, M.; Irwan, Y.M.; Gomesh, N.; Ahmad, N. S.

doi:10.1016/j.solener.2011.08.026

Cited by 35 publications

(23 citation statements)

References 16 publications

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“…Nash-Sutcliffe efficiency (NSE), relative error (Re), normalized root mean squared error (NRMSE) and linear regression [46,47], were used. The value of NSE, Re and NRMSE were calculated by the following equations and linear regression was obtained using statistical software, viz.…”

Section: Discussionmentioning

confidence: 99%

A Comparative Study of Potential Evapotranspiration Estimation by Eight Methods with FAO Penman–Monteith Method in Southwestern China

Lang

Zheng

Shi

et al. 2017

Water

136

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Potential evapotranspiration (PET) is crucial for water resources assessment. In this regard, the FAO (Food and Agriculture Organization)-Penman-Monteith method (PM) is commonly recognized as a standard method for PET estimation. However, due to requirement of detailed meteorological data, the application of PM is often constrained in many regions. Under such circumstances, an alternative method with similar efficiency to that of PM needs to be identified. In this study, three radiation-based methods, Makkink (Mak), Abtew (Abt), and Priestley-Taylor (PT), and five temperature-based methods, Hargreaves-Samani (HS), Thornthwaite (Tho), Hamon (Ham), Linacre (Lin), and Blaney-Criddle (BC), were compared with PM at yearly and seasonal scale, using long-term (50 years) data from 90 meteorology stations in southwest China. Indicators, viz. (videlicet) Nash-Sutcliffe efficiency (NSE), relative error (Re), normalized root mean squared error (NRMSE), and coefficient of determination (R 2 ) were used to evaluate the performance of PET estimations by the above-mentioned eight methods. The results showed that the performance of the methods in PET estimation varied among regions; HS, PT, and Abt overestimated PET, while others underestimated. In Sichuan basin, Mak, Abt and HS yielded similar estimations to that of PM, while, in Yun-Gui plateau, Abt, Mak, HS, and PT showed better performances. Mak performed the best in the east Tibetan Plateau at yearly and seasonal scale, while HS showed a good performance in summer and autumn. In the arid river valley, HS, Mak, and Abt performed better than the others. On the other hand, Tho, Ham, Lin, and BC could not be used to estimate PET in some regions. In general, radiation-based methods for PET estimation performed better than temperature-based methods among the selected methods in the study area. Among the radiation-based methods, Mak performed the best, while HS showed the best performance among the temperature-based methods.

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Section: Discussionmentioning

confidence: 99%

A Comparative Study of Potential Evapotranspiration Estimation by Eight Methods with FAO Penman–Monteith Method in Southwestern China

Lang

Zheng

Shi

et al. 2017

Water

136

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“…Day length for Adiyaman was calculated using equation (5). Sunshine duration was obtained by observations made by meteorology.…”

Section: Resultsmentioning

confidence: 99%

“…al. [5] suggested a new method which is combination of linear regression and Hargreaves method to estimate the solar radiation. Prieto et.…”

Section: Introductionmentioning

confidence: 99%

A comparison of experimental and estimated data analyses of solar radiation, in Adiyaman, Turkey

Soğukpınar¹,

Bozkurt

Çaliş

2015

International Journal of Engineering Technologies IJET

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Abstract-The world's main energy source is the sun. Other energy sources are caused directly or indirectly from the sun. Turkey has a rich potential in terms of solar energy and interest in solar power systems is increasing in the rapidly evolving technology. In all of the solar energy studies needs solar radiation data but solar radiation measurements are not possible on each area. Therefore, estimation of the solar radiation by using a variety of methods is emerging importance. In this study, Turkey and Adiyaman solar energy potential is investigated and statistical analysis was performed for Adiyaman. Various parameters were estimated by using actual solar radiation data from the Meteorology and experimental data were compared with theoretical ones. According to the results of the statistical analyzes, Adiyaman data indicate the best fit with the cubic model.

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“…Hargreaves and Samani (1985) [12] first suggested that the solar radiation ( s R ) can be estimated from the difference between maximum and minimum of air temperature using a simple equation;…”

Section: Hargreaves Methodsmentioning

confidence: 99%

“…Hence, if the TPVI is to be installed in one particular area, the information of the solar radiation is vital to decide whether it is worthwhile of such installation. The solar irradiation above 3 kWh/m 2 or solar irradiance above 300 W/m 2 is considered suitable to run the TPVI [12,13].…”

Section: Nomenclaturesmentioning

confidence: 99%

Output characteristics of photovoltaic module in Medan based on estimated solar irradiance using hargreaves method for application assessment of transformerless photovoltaic inverter

Alam¹,

Mashor²,

Irwanto³

et al. 2016

AIP Conference Proceedings

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Abstract. Referring to the Department of Meteorology, Climatology and Geophysics in Medan, North Sumatera, there is missing data of solar irradiance for the year of 2014. This paper is presented to estimate the solar irradiance using Hargreaves method based on the latitude and the monthly minimum and maximum temperature of the missing data. The temperature and estimated solar irradiance were applied to observe the output characteristics of a photovoltaic (PV) module. These parameters were used to assess the potential of the transformerless photovoltaic inverter (TPVI). Simulation results show that the average monthly solar irradiation was 6.98 kWh/m 2 using Hargreaves method. This was more than twice greater the normal solar radiation (3 kWh/m 2 ), which indicated that the sky in Medan was clear and had very high solar irradiation intensity for the year of 2014. These findings suggest there are a big potential of solar irradiation for generating the TPVI in Medan.

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Combination of Hargreaves method and linear regression as a new method to estimate solar radiation in Perlis, Northern Malaysia

Cited by 35 publications

References 16 publications

A Comparative Study of Potential Evapotranspiration Estimation by Eight Methods with FAO Penman–Monteith Method in Southwestern China

A Comparative Study of Potential Evapotranspiration Estimation by Eight Methods with FAO Penman–Monteith Method in Southwestern China

A comparison of experimental and estimated data analyses of solar radiation, in Adiyaman, Turkey

Output characteristics of photovoltaic module in Medan based on estimated solar irradiance using hargreaves method for application assessment of transformerless photovoltaic inverter

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