The use of the Peltier effect for the cooling of a cooler powered by photovoltaic energy is a solution for the conservation of foodstuffs or pharmaceuticals when conditions as well geographical and climatic become difficult. Only a problem often arises with the choice of the supply current. Indeed, a choice of the supply current too low will produce less cold while a choice of too much supply current (very close to the maximum value indicated by the manufacturer of the module) will produce more cold, but the module will work in saturation, which will reduce its life. This article proposes to present the possibility of optimizing a thermoelectric refrigeration installation. In particular: by improving the performances of the installation, by maximizing the coefficient of performance and the cooling capacity as a function of the power supply current of the Peltier effect module (of the TEC1-12706 type). Thus, to solve this problem, we propose an optimization of the thermoelectric installation while passing by the method of the derivatives which will make it possible to find this optimal current. This optimal current will be average current corresponding to the performance coefficient and the current for which the refrigeration power becomes maximum.
The main purpose of this study is to improve the energy efficiency of a refrigerated facility by means of exergetic analysis. In order to achieve this goal, we have evaluated the input exergy flows of the whole system to deduce the exergetic yields, which are compared to the degree of irreversibility in order to have a qualitative measurement of energy losses. The concept of exergy is the part of energy that is virtually converted into work. The exergetic analysis was performed on a refrigeration unit ZR22K3E Copeland Scroll. The results of this analysis are consistent with the condition, that the exergetic performance, which is: 36.57% and it is approximately equal to the degree of irreversibility which is 37.50%. This approach provides a comprehensive, standard and rigorous framework for the analysis of energy systems, and thus for the understanding and systemic management of the energy challenge.
In this paper we present a technique for determining the optimum junction recombination velocity of a solar cell, using a combination of the electrical equivalent model, and the finite element method. Starting from the continuity equation that describes the solar cell operation solved in one dimension by the finite element method, the excess minority carrier's density is determined. From this density, the photocurrent, the photovoltage and the power produced by the solar cell are determined. The photocurrent and the photovoltage are represented according to the junction recombination velocity, as well as the solar cell power versus the photovoltage, for various values of the series resistance. In considering its equivalent electrical model, the solar cell is modeled and simulated with Matlab/Simulink. In this simulation model, the capacitor initially discharged, charges under the effect of the solar cell. Its impedance varying according to time, represents the load resistance which corresponds to an operating point of the solar cell. During the capacitor charge process for various values of the series resistance, we obtain the current-voltage characteristic of the solar cell in order to highlight the series resistance effects on the solar cell power. From the optimal value of the power, and that of solar cell photovoltage obtained by simulating the solar cell using Matlab/Simulink, the value of the junction recombination velocity corresponding to the maximum value of the solar cell power is determined numerically, for various values of the series resistance.
This study made it possible to determine by the application of thermodynamics in finished time, the points of instruction necessary to the development of a regulation system for the rationalization of the power consumption in a cold store. These points were obtained by determining the optimal variations of temperature as well to the condenser and the evaporator corresponding to the minimum capacity absorptive by the compressor for a maximum COP.
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