الفهرس | Only 14 pages are availabe for public view |
Abstract The main purpose of this dissertation is to design and evaluate a new PY structure module which overcomes the drawbacks of the existing modules, using available materials., since the conventional module has many deficiencies during its long-term operation on environmental conditions. An example of such deficiencies are cell cracking, failure of interconnection and degradation of output power. The new PY module structure consists of three plates (front cover, ceJJs adhered to substrate and backcover) which verify a thermal stress relief on cells and m.i.n.imum cells temperature. Two methods of interconnections are used in fabrication process. The first oue is through hole method, and the second one is surface mount method, where conductive adhesive is used, the fabrication processes are simplified. Also besides to the conventional framing method., a case method have been developed to give more mechanical rigidity to the module structure. Modules of dimension (25 x 25)cm2 have been fabricated from locally selected materials. These modules are subjected to thermal cycling test, humidity test, air pressure cycling test and electrical isolation test. to addition visual inspections, X ray radiography examination and electrical performance measurements are performed after each qualification test to evaluate the effect of environmental tests on performance and structure of the modules Thermal, optical, and electrical models are developed to study the effect of encapsulation layers on cell temperature, solar radiation.,and output power. The results of these tests and measurements lead to optimum design and realization of modules with simple fabrication process and good performance. |