A generalized model to estimate field size for solar-only parabolic trough plant

Paper presented to the 3rd Southern African Solar Energy Conference, South Africa, 11-13 May, 2015.A number of computer performance simulations have been developed for modelling the performance of parabolic trough plants, most of which are proprietary or require very detailed inputs. Hence, there is a need to develop a generalized model that allows the designer to quickly estimate the solar field size for a parabolic trough plant at a given location. In order to cater to this need, a generalized model has been developed using the equations, correlations and typical values of certain parameters available in the open literature. The paper presents the complete details of various equations, correlations, loss models and the general data to be used by designer and outlines a systematic procedure coded in MatlabTM to evaluate solar field size for solar-only parabolic trough plant. Finally, to demonstrate this procedure, the model has been used to estimate the solar field size for a small 25 kWe solar-only trough plant at SVNIT, Surat, India. The results of the model indicate the solar field size of 245m2 for a 25 kWe plant to be installed at SVNIT, Surat.dc201

Numerical simulation of pressure swirl atomizer for small scale gas turbine combustion chamber

The use of Small Gas Turbine to meet on-site small-scale energy demand offers a great opportunity for preliminary energy saving and reduction of pollutant and greenhouse emissions. The properly designed atomizer can reduce emission and impart flame stability. The numerical simulation of designed pressure swirl atomizer for small scale gas turbine combustion chamber is carried out using ANSYS Fluent. The fuel injection pressure at inlet is kept 6 bar, 9 bar, 12 bar, 15 bar and 18 bar and ambient pressure and temperature is kept constant at atmospheric condition. LISA (Linearized Instability Sheet Atomization) model is used to understand the primary atomization process while the TAB (Taylor Analogy Breakup) model is used to understand secondary breakup of droplets. The numerical results of variation of non-dimensional Sautar mean diameter (SMD) at different injection pressure are compared with theoretical results. It has been found that the non-dimensional SMD decreases with increases in injection pressure and TAB model give satisfactory values compared to theoretical one.Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .International centre for heat and mass transfer.American society of thermal and fluids engineers