Recent progress in the development of coarse-mesh nodal methods for the numerical solution of the neutron diffusion and transport equations is reviewed. Compared with earlier nodal simulators, more recent nodal diffusion methods are characterized by the systematic derivation of spatial coupling relationships which are entirely consistent with the multi-group diffusion equation. These relationships most often are derived by developing approximations to the one-dimensional equations obtained by integrating the multidimensional diffusion equation over directions transverse to each coordinate axis. The objective of this research is to develop accurate and efficient spatial homogenization method for coarse mesh analysis of light water reactors. More sophisticated methods for computing approximate equivalence parameters are also introduced and make use of nonlinear iterations between homogenized reactor calculations and local fixed-source calculations to compute equivalence parameters. This special feature induces the need for the study on homogeneous parameters of light water reactor which takes phenomena of different scale and their interaction into account by means of the nodal diffusion method.
In the new era of mounting awareness of sustainable development, the distributed power generation is become one of energy system alternatives under consideration. This paper deals with a cost model of distributed power generation, An oence building distributed energy system located in Beijing is investigated as a sample of the model. In line with the ocace building's energy demand profile and the characteristics of Beijing local electric network, an economic feasibility study on the distributed power generation at a competitive electric market stmcture is presented.
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