Green Energy Technology Innovation Park

1. Photovoltaic Thermal Solar Collectors (PVT)

The term PVT refers to solar thermal collectors that use PV cells as an integral part of the absorber plate. The system generates both thermal and electrical energy simultaneously. The number of the photovoltaic cells in the system can be adjusted according to the local load demands. In conventional solar thermal system, external electrical energy is required to circulate the working fluid through the system. The need for an external electrical source can be eliminated by using this hybrid system. With a suitable design, one can produces a self-sufficient solar collector system that required no external electrical energy to run the system. The air flowed through the first channel formed by the glass cover and the photovoltaic panel. Next it enters the second channel formed by the back plate and the photovoltaic panel. The first channel has compound parabolic concentrators to concentrate solar radiation. The second channel has fins that transfer the heat from the photovoltaic panel. This flow arrangement and the compound parabolic concentrators as well as the fins will increase heat removal from the photovoltaic panel and will enhanced the efficiency of the system. Experimental results show that the thermal and electrical energy output of the system improves with a double-pass system compared with a single-pass system. It has also been shown that the system with fins always performs better than conventional flat-plate collector. The efficiency increases from 8% to 14% if the fins with density 0.32 cm-1 are added to the flat-plate absorber.


2. Grid-Connected Photovoltaic System

Photovoltaic systems convert sunlight into direct electrical current. There are two types of photovoltaic systems for building applications. These types are stand-alone and grid-connected systems. As their names imply, these systems are distinguished by their interaction with the electric utility. Since stand-alone systems are not connected with the utility, any electricity that cannot be used by on-site loads must be stored or dissipated. With the grid-connected systems, this excess electricity can be fed back to the grid.


3. Solar Panel Maximum Power Point Tracker (MPPT)

Solar panel maximum power point tracker is a component of photovoltaic system that operates the photovoltaic array at its maximum power point. The maximum power point varies depending on cell temperature and the present insulation level. Therefore, a maximum power point tracker (MPPT) is implemented to control the variation of the current-voltage characteristics in the solar panel. The objectives of the research are: to ensure that PV system operates close to maximum power point when it is subjected to change due to the tropical environmental conditions; to provide high energy conversion efficiency in solar car electrical power conversion system; to maintain tracking for wide range of variations in tropical environmental conditions; and to provide an output interface that compatible with battery charging requirements.

4. Hybrid Systems

The hybrid system is a very efficient means of energy generation. Different forms of energy sources can be combined. A hybrid wind photovoltaic system has been developed. The system consists of four 60 Wp photovoltaic panels, 60 W wind turbine, the charger-controller for controlling the charging and discharging of the battery and a battery bank for storing the electric energy generated for later use.


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