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PV water pumping systems for grassland and farmland conservation
Mälardalen University, School of Business, Society and Engineering.ORCID iD: 0000-0002-1351-9245
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Grassland degradation is considered as one of the worst environmental and economic problems in China because of the negative impacts on water and food security. The application of the photovoltaic water pumping (PVWP) technology for irrigation is an innovative and sustainable solution to curb the progress of grassland desertification and to promote the conservation of farmland in remote areas. The combination of PVWP with water saving irrigation techniques and the sustainable management of the water resources enhances the grass productivity enabling to halt wind and rainfall erosion and to provide higher incomes and better living conditions for farmers. PVWP systems have been used for more than 40 years especially for drinking purposes, livestock watering and irrigation in small-medium size applications. Nevertheless, several knowledge gaps still exist and system failures still occur, which are mainly bounded to the system design procedure and optimization. The technical and economic feasibilities related to the system implementation, especially effectiveness and profitability, need to be addressed. Moreover, irrigation in remote areas constrained by availability of water resources has to be investigated for a better understanding of PVWP system integration with the environment and for optimization purposes. This thesis is to bridge the current knowledge gaps, optimize system implementation and prevent system failures 

 

Validation of the models adopted and optimization of the system on the basis of solar energy resources and exploitable groundwater has been performed for a pilot PVWP system in Inner Mongolia. The match between the water supplied through the pumping system and the grass water demand has been studied, and the effects of pumping on the available resources and the crop productivity have been evaluated. The economic analyses have also been conducted in order to establish the most cost effective solution to provide water for irrigation and to evaluate the project profitability. In addition, the CO2 emission reductions by using PV technology have been assessed as well.

 

It was found that the proper designed PVWP system represents the best technical and economic solution to provide water for irrigation in the remote areas compared to other water pumping technologies, such as diesel water pumping and wind power water pumping due to the high positive net present values and short payback periods.

Place, publisher, year, edition, pages
Västerås: Mälardalen University , 2013.
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 172
National Category
Energy Systems
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-22952ISBN: 978-91-7485-127-4 (print)OAI: oai:DiVA.org:mdh-22952DiVA: diva2:666134
Presentation
2013-12-17, Gamma, Västerås, 13:15 (English)
Opponent
Supervisors
Available from: 2013-11-25 Created: 2013-11-22 Last updated: 2013-12-12Bibliographically approved
List of papers
1. Dynamic modelling of a PV pumping system with special consideration on water demand
Open this publication in new window or tab >>Dynamic modelling of a PV pumping system with special consideration on water demand
2013 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 112, 635-645 p.Article in journal (Refereed) Published
Abstract [en]

The exploitation of solar energy in remote areas through photovoltaic (PV) systems is an attractive solution for water pumping for irrigation systems. The design of a photovoltaic water pumping system (PVWPS) strictly depends on the estimation of the crop water requirements and land use since the water demand varies during the watering season and the solar irradiation changes time by time. It is of significance to conduct dynamic simulations in order to achieve the successful and optimal design. The aim of this paper is to develop a dynamic modelling tool for the design of a of photovoltaic water pumping system by combining the models of the water demand, the solar PV power and the pumping system, which can be used to validate the design procedure in terms of matching between water demand and water supply. Both alternate current (AC) and direct current (DC) pumps and both fixed and two-axis tracking PV array were analyzed. The tool has been applied in a case study. Results show that it has the ability to do rapid design and optimization of PV water pumping system by reducing the power peak and selecting the proper devices from both technical and economic viewpoints. Among the different alternatives considered in this study, the AC fixed system represented the best cost effective solution.

Keyword
Photovoltaic system, Pumping system, Renewable energy resources, Solar energy, Water demand
National Category
Engineering and Technology
Identifiers
urn:nbn:se:mdh:diva-18229 (URN)10.1016/j.apenergy.2012.12.073 (DOI)000329377800067 ()2-s2.0-84884208109 (Scopus ID)
Available from: 2013-02-15 Created: 2013-02-15 Last updated: 2017-12-06Bibliographically approved
2. Economic analysis of photovoltaic water pumping irrigation systems
Open this publication in new window or tab >>Economic analysis of photovoltaic water pumping irrigation systems
2013 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Irrigation through photovoltaic water pumping (PVWP) system represents one of sustainable and attractivesolutions regarding the problems related to the Chinese grassland desertification. This paper is to investigatethe economics of PVWP systems taking in consideration of the key parameters affecting the sizing, and furtherthe initial capital cost (ICC), the life cycle cost (LCC) and revenues. In particular photovoltaic (PV) modules cost,availability of the well and of the irrigation system, designing water-head, irrigated area and related waterdemand, fuel price and grass production are investigated for the sensitivity analysis. The possibility ofcombining water pumping with electricity production for maximizing benefits is also discussed. Both PVWP anddiesel water pumping (DWP) systems are compared in terms of ICC and LCC. LCC, sensitivity, break-even point(BEP), net present value (NPV) and payback period (PBP) analyses are used to compare and evaluate theeconomic feasibility of the different alternatives investigated. The results show that the availability of the welland the depth of the ground water resources are the most sensitive parameters affecting the initial capitalcosts whereas the grass production and incentives affect mainly the NPV and PBP. The co-benefits for carbonmitigation and carbon credit trading through implementing photovoltaic water pumping system for the Chinesegrassland are also addressed in this paper.

Keyword
Photovoltaic, water pumping, irrigation, economic analysis, CO2 emissions savings.
National Category
Energy Systems
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-22951 (URN)
Conference
5th Int. Conference on Applied Energy, 1–4 July 2013, Pretoria, South Africa
Funder
Sida - Swedish International Development Cooperation Agency
Available from: 2013-11-22 Created: 2013-11-22 Last updated: 2015-11-16Bibliographically approved

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