The variability of the daily solar radiation components over Helwan

Hassan, A.H.

doi:10.1016/s0960-1481(00)00144-0

Cited by 12 publications

(3 citation statements)

References 2 publications

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“…℃ ⁄ ), is the oil outlet temperature from the heat exchanger (℃), is the oil inlet temperature to the heat exchanger (℃), ℎ is the enthalpy of the outlet motive steam from the heat exchanger ( ⁄ )and ℎ is the enthalpy of the inlet motive steam to the heat exchanger ( ⁄ ).Also, variation of the oil outlet temperature, T oo , results in changing of motive steam mass flow rate through the TVC system which affects the performance of the hybrid system. Firstly, in order to study the dynamic behavior of the hybrid system for different months, the intensity of the solar radiation is set as predicted by Hassan [31].…”

Section: Hybrid Desalination System Driven By Dynamic Heat Sourcementioning

confidence: 99%

Hybrid Desalination System Using Parabolic Trough Concentrator as a Heat Source

Rashed

Saif

Shatat

et al. 2016

Port-Said Engineering Research Journal

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This paper deals with the status of the new hybrid desalination methods which need more research like thermal vapor compression and direct contact membrane distillation system. The objective of this research is to theoretically investigate the characteristics of a hybrid desalination system composed of a thermal vapor compression (TVC) and direct contact membrane distillation (DCMD) systems using parabolic trough concentrator as a heat source. The proposed hybrid system aims to recover the heat of the rejected brine from thermal vapor compression system in order to obtain the highest fresh water productivity and thermal efficiency and lowest cost of fresh water product from the system. The theoretical simulation of all the systems were developed and solved by Engineering equation solver (EES). After the validation of all the models, the design of thermal vapor compression and direct contact membrane distillation were selected. It was concluded that the best operating conditions to run the system is at motive steam pressure of 3000 kPa and boiling temperature of 70 ℃. The dynamic behavior of the hybrid system was conducted at the selected operating conditions at different seasons of the year in order to examine the performance of the system through the year. Finally, economic study was developed for the proposed dynamic hybrid desalination system. The results showed that both of the performance ratio and water productivity enhanced by 7.3 % by adding the DCMD as a secondary desalination unit. In addition, the dynamic hybrid system efficiency reached to 75%. Also, the cost of the fresh water product by dynamic hybrid desalination system was 0.

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Section: Hybrid Desalination System Driven By Dynamic Heat Sourcementioning

confidence: 99%

Hybrid Desalination System Using Parabolic Trough Concentrator as a Heat Source

Rashed

Saif

Shatat

et al. 2016

Port-Said Engineering Research Journal

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“…This study revealed a decrease of direct radiation by 30-45% with respect to the results of 1922 and by20% with respect to 1967 (Mosalam Shaltout and Rahoma, 1996). The environmental pollutants and their effects on the photovoltaic performance in the desert climate of Egypt have demonstrated that, the pollutants reduced the direct radiation by 43%, global radiation by 19%and increase the diffuse radiation by 72% (Hassan, 2001). The pollutants are reduced the clearness index by 12% and increase the diffuse fraction by 91%.…”

Section: State Of Air Quality In Helwanmentioning

confidence: 99%

Estimate of Aerosol Optical Depth Using Broadband Direct Normal Observations at Highest Polluted Area in the World

Rahoma¹

2010

American Journal of Applied Sciences

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Problem statement: The measurement of different components of direct solar radiation for this research has been carried out in Helwan, Egypt. Helwan (Latitude 29Â°52 N, Longitude 31Â°20 E). This is a considered as the largest polluted region in the world. The level of pollution in Helwan region is higher, compared to the international limit by about 7 or 10 times in industrial and populated region respectively. Approach: The daily variation for different components of solar radiation bands as global, direct (total, yellow, red and infrared) and diffuse solar radiation had been studied and discussed. The data measurements have been taken for nine years (1991-2000). Hourly data of solar irradiance on a horizontal plane had also been recorded simultaneously together with relative humidity and wind speed along with some traditional techniques for selecting the clear sky days of the period examined. Results: The results clearly showed seasonal dynamics in aerosol loading, type and perceptible water. Conclusion: Background levels of aerosols, which we defined as yellow color less than 0.10, had observed at almost all sites but varying frequencies

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“…In this regard, recently, several empirical formulas using various parameters have been given to estimate the solar radiation around the world (e.g. Munroe, 1980;Barra, 1983;Hutchinson et al, 1984;Ma and Iqbal, 1984;Badescu, 1987;Bahel et al, 1987;Soler, 1988;Samuel, 1991;Kudish and Lanetz, 1992;El Aroudam et al, 1992;Nfaoui and Buret, 1993;Srivasta et al, 1993;Rehman and Halawani, 1997;Aksakal and Shafiq-ur-rehman, 1999;Mosalam Shaltout et al, 2001;Hassan, 2001). These parameters include extraterrestrial radiation, sunshine hours, relative humidity, ambient temperature, soil temperature, number of rainy days, altitude, latitude and cloudiness.…”

Section: à2mentioning

confidence: 99%

Estimation of solar radiation parameters for Izmir, Turkey

Ülgen

Hepbaşlı

2002

Int. J. Energy Res.

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SUMMARYIn this study, the solar radiation parameters (global and diffuse solar radiation) are correlated with respect to ambient temperatures in the fifth-order polynomial form for Izmir in Turkey. Experimental data were measured in the Solar-Meteorological Station of Solar Energy Institute in Ege University over a 5-yr period, 1994-1998. The ratios of the total daily diffuse to global radiation intensities for each month range from 0.38 to 0.45 averaged for the same period, with an average value of 0.41. It can be concluded that the present models predict the solar radiation parameters reasonably well with the correlation coefficients over 0.95 for the projections.

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The variability of the daily solar radiation components over Helwan

Cited by 12 publications

References 2 publications

Hybrid Desalination System Using Parabolic Trough Concentrator as a Heat Source

Hybrid Desalination System Using Parabolic Trough Concentrator as a Heat Source

Estimate of Aerosol Optical Depth Using Broadband Direct Normal Observations at Highest Polluted Area in the World

Estimation of solar radiation parameters for Izmir, Turkey

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