This work is concerned with assessing the thermal performances of a solar water heating system which is dependent on a linear Fresnel receiver (LFR) as a solar energy converter. The main objective of this paper is validation the experimental work carried out in the winter of 2015 on the concentrator in the climatic conditions of Algerian city “Blida” by a numerical simulation, where the tap water used as a heat carrier fluid. This simulation was used to solution of the energy balance equations of the absorber tubes and the water, where the solution is based on the finite difference method with an implicit scheme. After the solution of nonlinear equations, the program performed by using the MATLAB language gives the thermal efficiencies, the absorber temperatures, the water temperatures at the absorber tubes outlet, and thermal losses coefficients. The thermal efficiency of the reflector is exceeded 29%. The results obtained proved the existence of substantial convergence between the experimental and the numerical results, where in all cases the water temperature exceeded 347K

In this work a numerical solution with moving mesh technique is made. Many research works both experimental and numerical on the diffuser volute interactive phenomenon have been undertaken so far. But it is found from the literature that the study on the impeller-diffuser-volute interaction as well on the performance of the turbocharger centrifugal compressor by varying the geometry of volute has not been the focus of attention in these works. Hence a numerical analysis has been carried out in this work to extensively explore impeller-diffuser-volute fluid interaction as well as to predict the flow and turbulence characteristics of the centrifugal compressor by varying the volute geometry without changing the number of impeller blades. It is found from the analysis that volute geometry presents a considerable effect on the pressure and temperature at the compressor outlet