Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
Everybody knows that water is necessary for life. Access to groundwater and energy for people living in remote areas always has been challenging. Many people living in remote areas deprived of electrical distribution lines and they have to use nonelectrical or conventional water pumping systems, which have several problems. Water pumping systems powered by solar energy is suitable choice technically, economically and environmentally in villages, farms, and ranches located remotely; especially for areas with great potential of solar energy like African countries.
In this thesis, an innovative design of portable off-grid photovoltaic-powered water pumping system is presented. The purpose of this research is to design different off-grid PV water pumping system, which will be portable, more practical and high efficient comparing to other available systems. This project also aims to obtain an optimum sizing of the PV arrays, practical installation of the system, selecting appropriate site, estimation the availability of sun radiation, evaluate the performance of the system, and SWOT analysis of the system. Simulation software, PVSYST are used to analyze and optimize the system. Metrological data of Bloemfontein in South Africa is selected as a case study.
In the beginning, reviews of available literature on different water pumping systems are carried out. Several conventional water-pumping systems, configurations and different components of solar-PV water pumping system are studied. After designing a portable off-grid photovoltaic-powered water pumping system, simulation is carried out. Other possibilities for system configuration and several different system layouts and coupling strategies are considered. Power conditioning unit in the proposed strategy is MPPT DC converter with minimum and maximum voltage of 19 and 38 respectively. Two deep well pumps of 140 W and two PV modules with nominal power of 340 Wp (STC), are configured in the system for delivering water need of 7 m³/day, with maximum pumping depth of 40 m, storage tank with 28 m³ volume, and piping length of 84m.
In the end, simulation results show that the designed system is able to pump 2487m³ water per year and approximately fulfil water needs with high efficiency, taking into account sun radiation, PV array and pump power. Pump efficiency and system efficiency are reached 51% and 85.2 % respectively, which are substantial results for this system.
Moreover, it interestingly noticeable that unused energy is 0.1 kWh/kWp/day and it shows that this system operates properly. Performance ratio accounts for 70.2% during system simulation, which will be substantially great indicator of the quality of the system itself, independently of the incoming irradiance. Economic evaluation also shows significant results for the proposed system. Total yearly cost is estimated € 947 per year. Cost of pumped water is evaluated 0.38 € per m³, which makes the designed system cost effective.
Simulation results, performance analyzing, losses determination and economic evaluation indicate that the designed system is a sustainable, cost-effective, and reliable solution for pumping water in remote locations.
2014. , 108 p.
Solar Photovoltaic Energy; Water Pumping Systems; Portable Design; PV sizing; PVSYST Simulation; MPPT DC converter ; Remote locations; Bloemfontein