Renewable Energy Research

Photovoltaics and fresnel photovoltaics

Development of a Linear Fresnel 2 And Performance Evaluation of a Parabolic Trough

Nowadays 85% of the energy we use comes from fossil fuels. Fossil fuels are energy sources such as coal, oil and natural gas. With this rate the world virtually depends on the supply of fossil-fuel. But the common issue presented to us is that fossil-fuels are running out, so the only alternative for this fossil energy is the renewable energy. Renewable energy is energy generated from natural resources - such as sunlight, wind, rain, tides, and geothermal heat - which are renewable (naturally replenished). In this research the focus will be on solar energy. There are four types of concentrating solar power plants designs: Dish/engine, Power tower, Parabolic troughs and Linear Fresnel. We will discuss in our work the Parabolic trough and the Linear Fresnel as they are two of the most efficient types in the solar energy. Our work consists of experimental and theoretical parts. The experimental part is the developing of a linear Fresnel including the solving of the previous problems in the systems and improving the structure design with the aid of using Solid works program. The theoretical part is creating a program that evaluates the performance of a parabolic trough collector which is commonly used in solar plants with the aid of Fortran 77.

Design and Manufacturing motor selection and control of a concentrated Photovoltaic Thermal PVT system - Control of the mirror tracking system III

Electricity generated by photovoltaic systems has become a global need nowadays as it is considered to be clean, safe and renewable source of energy. The aim of this project is to design a 3x concentrated photovoltaic system and compare between the amounts of electric power produced by two PV panels; one is placed directly towards the sun and the other has solar concentration by the use of number of mirrors. In this project excessive works was done to monitor voltage, current, .power and temperature of the PV panels. The whole chassis of the project was made of steel of thickness 4 mm and coated with electrostatic .The system consists of two main parts: the chassis holder of 2 PV/T panels which are 2 x 50 W and 4 stands holding 8 mirrors. The design was made in a way where there would be an upper PV panel receiving 1x sun irradiance and a lower PV panel that must receive 3x sun irradiance which gives 3x concentration and this is done through the 8 mirrors placed below it . The system is able to track automatically the sun from east to west by using a servo motor of torque 20 installed in the system to rotate the mirrors at the desired angle of reflection of sun. It is expected that the power of the concentrated PV panel will be at least 5 times greater than the panel without concentration. Also A cooling process is done to increase the electric power of the 2 PV panels and to get hot water for consumer use by the use of two tanks; one for cooling and the other for receiving hot water and our target is the hot water reaches 60 °C.

Developing a photovoltaic thermal solar collector

Nowadays , with the continuing increase of world‟s population and therefore the increased energy demand , all these together with the gradually increasing global warming effect of which carbon dioxide emissions play the huge role , renewable energy and especially solar energy has become an option to meet the global increasing energy demand and helps saving our planet at the same time. In Egypt, as we have huge sun potentials in addition to the fact that most of our lands are deserts so employing the solar energy in an efficient way could be a turning point in our future. Photovoltaics (PVs) are simply explained as solar cells which convert energy from the sun as its input into an electric power output.The most important parameters which will control the use of photovoltaics in the future are the cost and efficiency. Among the main things that decrease the efficiency of the photovolatics is the increased temperature of PV module which is considered at the same time as lost thermal energy. Photovoltaic thermal solar collectors (PV/Ts) are photovoltaic cells for which a cooling system is applied to increase the efficiency of the electric output power from one side and on the other side the heat absorbed by the cooling fluid can be used as useful energy for heating purposes. In this work a photovoltaic thermal system has been designed, manufactured and tested.

Computer Simulations for Solar Cooling (Sizing of Solar Thermal Collector Field 1)

The goal of this project is to simulate a Solar cooling behaviour to be able to get the most reliable results that could be put into the implementation and application phase to achieve the best performance of an integrated system. The first direction that was taken is to design the system on "TRNSYS" which is a simulation program that has a simple user interface to facilitate the connections between different components of a system. The second direction that was taken was to implement the system on a program called Engineering Equation solver "EES". The EES program gives the advantage of detecting the behaviour of different components and parameters depending on equations that were written in the modules and functions.By integrating all the cooling system components whole system performance was achieved under pre-studied specific conditions. This project will contribute in solving the problem of electricity cut-outs as it will decrease the load of all the electric air conditioners and since it is an environmentally friendly project it will prevent any further complications that might occur in the future due to the environmental unbalance. This project will help in learning , understanding and implementing the solar cooling system , as well as comparing different technologies used in this field.

Development of a Linear Fresnel 1 And Performance
Evaluation of a Parabolic Trough

Many international studies and experience have shown that solar thermal power plants are the most economic form of the solar electricity generation. Since such plants are based on the concentration of the solar radiation to achieve high temperatures necessary for the thermo-dynamic power plant process, their application area is restricted to earth regions with high direct solar radiation. North Africa countries are among such regions. There are four primary types of concentrating solar power plants designs: Parabolic troughs, linear Fresnel, Dish/engine and power tower. We will focus our work on the first two types, as the parabolic trough is the mostly developed and commercially tested, and the linear Fresnel as it offers the promise of cost saving and reduced land use and lowest in cost to build. Our aim is to develop a prebuilt linear Fresnel solar collector model, which was the bachelor project of our fellow colleges in our university. This consists of theoretical and experimental work. First we identified the problems in the previous system then solved them. We improved the structure design with the aid of using Solid works program. Moreover, we have created a program that evaluates the performance of a parabolic trough collector which is commonly used in solar plants with the aid of Fortran77. FORTRAN is a procedural, imperative programming language that is especially suited to numeric computation and scientific computing. The program calculates the heat transfer from the sun to the system from which final outlet fluid temperature flowing out the collectors to the plant.