- Thursday, February 26, 2009
- Published at:Not Found
- Copyright © 2004 Elsevier B.V. All rights reserved.
On the storage batteries used in solar electric power systems and development of an algorithm for determining their ampere–hour capacity
Marwan M. Mahmoud
Energy Research Centre, An Najah National University, Nablus, P.O. Box 721, WestBank, Palestine, Israel
Received 7 October 2003;
Revised 18 December 2003;
accepted 20 December 2003.
Available online 9 April 2004.
Abstract
Storage batteries are indispensable in all stand alone solar electric systems (PV power systems). Their efficiencies and life times affect significantly the overall PV system performance and economics. Batteries specified especially for use in PV systems have to be distinguished with standing of very deep discharge rate and high cycling stability.
Ordinary batteries being marketed world wide for use in automobile, are mostly not appropriate for PV power systems. The m
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- Thursday, February 26, 2009
- Published at:Not Found
- Copyright © 2005 Elsevier Ltd All rights reserved.
Techno-economic feasibility of energy supply of remote villages in Palestine by PV-systems, diesel generators and electric grid
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Marwan M. Mahmoud, and Imad H. Ibrik
Energy Research Centre, An-Najah National University, Nablus, P.O. Box 721, West Bank, Palestine
Received 14 September 2004;
accepted 15 September 2004.
Available online 11 November 2004.
Abstract
As a contribution to the development program of rural areas in Palestine, this paper presents three energy supply alternatives for a remote village represented in PV system, diesel generator and electric grid. Design of these systems and the associated costs of their utilization are illustrated.
A computer-aided dynamic economic eva
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- Thursday, February 26, 2009
- Published at:Not Found
- Copyright © 2005 Elsevier Ltd All rights reserved.
Technical note
Transient analysis of a PV power generator charging a capacitor for measurement of the I–V characteristics
Marwan M. Mahmoud, a,
aEnergy Research Centre, An Najah National University, P.O. Box 721 Nablus, West Bank, Palestine
Received 31 January 2005;
accepted 19 September 2005.
Available online 28 October 2005.
Abstract
Measuring the I–V characteristics is of high importance since it can be considered as a quality and performance certificate for each PV generator. The most precise and inexpensive measuring method is represented in capacitor charging by the PV generator. Using the equivalent circuit of the PV generator with a capacitor as load and applying transient analysis on the circuit, we obtain the capacitor charging voltage and current as a function of time, as well as their differentials as a function of short circuit curre
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- Friday, April 1, 2005
- Published at:Not Found
- A photovoltaic-powered water pumping system, employing an induction motor pump, capable of supplying a daily average of 50 m3 at 37-m head has been developed. The system was installed on a desert well in Jordan, where: the average solar radiation amount to 5.5 kW h/m3/day, to provide the Bedouins living in the well area with drinking water.
A mathematical model to enable testing the system performance by computer simulation was developed. This model allows the representation of motor torque in function of speed (and slip) at different supply frequencies, as well as the flow rate and efficiency of the system in function of supply frequency and pumping head.
Prior to its installation on the desert well, the system performance, in accordance with frequency and head, was thoroughly tested in the laboratory. As illustrated in this paper, simulation and laboratory testing results are well matched. At constant pumping head, the flow rate is proportional to the supply frequency of the mot
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- Tuesday, March 1, 2005
- Published at:Not Found
- Energy conservation in utilities has played a vital role in improving energy efficiency in the industrial, commercial and residential sectors. The electrical energy consumption in Palestine has increased sharply in the past few years and achieved by the end of 2001 to 10% per year. It is expected that this percentage will increase to about 12% if the current political situation will end hopefully with peace. Modern energy efficient technologies are needed for the national energy policy. Such technologies are investigated in this paper. Implementing of a national 3 years project aiming at energy efficiency improvement in residential and industrial sectors as well as in public utilities, which include wide range of diversified audits and power measurements, had led to creating this paper. Measurement and audit results had shown that the total conservation potential in these sectors is around 15% of the total energy consumption. The associated costs of the investment in this field are relatively low and correspo
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