Simulations help students to deal with complex real problems, therefore engineering instructors include these software packages in their teaching methodologies. To achieve a learning aim, different programs can be chosen. Which is the adequate choice? Based on educational criteria, we implement a wellknown selection method, the analytic hierarchy process (AHP), to find a satisfactory solution. An example portrays the selection tool performance in the thermal engineering field. ß
Abstract:The energy consumed to cool buildings is very elevated and solar gains represent a high percentage of these cooling loads. To minimize the thermal load it is necessary to control external shading systems. This control requires continuous measurement of solar radiation in different locations of the building. However, for such applications the use of conventional irradiance sensors increases the cost and reduces the profitability of the installation. This paper is focused on the development, modeling, and experimental validation of low cost irradiation sensors based on photovoltaic effect in order to reduce the costs of dynamic external shading devices and to improve the profitability of the system. With this proposal, firstly, small commercial photovoltaic cells have been adapted for use as an irradiation measurement device. Subsequently, quasi-stationary and continuous experimental measurements of these silicon cells, facing south and installed horizontally, have been carried out in Jaén (Spain) in 2009 and 2010. Finally, a nonlinear multiparameter function has been developed to evaluate the irradiance using the electric current generated by the cell, cell temperature, ambient temperature, and absolute humidity. A favorable agreement between the model predictions and experimental data has been observed with a coefficient of determination around 0.996 for all cells.
This paper focuses on the analysis of a dynamic simulation model used to describe the operation of a solar cooling system located in Jaén (Spain). The dynamic model has been developed using the simulation environment TRNSYS. The main goal of this paper has been to analyze separately the dynamic behaviour of each components of the installation and have been shown the differences between the temperatures of input and output of each of them, discussing and justifying the phenomena that appear. During the analysis phase and using and detailed model of the solar cooling system, it has been dedicated a special interest in showing the differences in all components between the initial transitional period and the period of stabilization of their operation.
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