Abstract. This paper presents the study of heat transfer in a solar air heater by using new design of solar collector. The collector efficiency in a single pass of solar air heater without, and with using fins attached under the absorbing plate has been investigated experimentally. Due to adding the fins to the interior of an absorber plate, the desirable effect of increasing the heat transfer coefficient compensates for the undesirable effect of decreasing the driving force (temperature difference) of heat transfer, while the attached fins provide an enlarged heat transfer area. In this study, the absorbing plate of solar collector is attached with fins for further improved performance. The improvements of collector efficiencies in the single pass solar air heaters with, and without fins attached; increase with increasing the mass flow rate, especially for operating at lower air flow rate. Experiments were performed for two air mass flow rates of 0.012 and 0.016 kg/s. Moreover, the maximum efficiency obtained for the 0.012 and 0.016 kg/s with, and without fins were 40.02, 51.50% and 34.92, 43.94% respectively. A comparison of the results of the mass flow rates by solar collector with, and without fins shows a substantial enhancement in the thermal efficiency.
In this work, we have to propose an adequate model, to predict according to various contexts the global solar radiation. We have developed a confrontation between solar radiation values measured on an Algerian site, and values estimated by theoretical models proposed by various researchers. In which meteorological data and are continuously collected. In our experimental study we simulated the model developed by comparative study with the model of MY Mechraoui, showed that the experimental results are in good agreement with those given by the model developed, which is in agreement with that of M. Capderou,which presents a better estimate of global solar radiation with a small error between the measured values and those calculated. The set of studies was done for the Biskra site, horizontally.
In the field of thermal conversion of solar energy, several studies have been conducted to model different parameters related to this process. But in all the models encountered, the parameters obtained are more or less close to reality. For us the best is the one that best reflects the variation of the modeled parameter. In fact, the confrontation of the values resulting from the experimental measurements makes it possible to judge the accuracy of the established model. In this context this study was conducted. The aim of the study is to model global solar radiation according to the ambient temperature, geographical location of the site, date and time. The obtained models are compared with the experimental results. In our experimental study we simulated the model developed by comparative study with the model of MY Mechraoui, showed that the experimental results are in good agreement with those given by the model developed, which is in agreement with that of M. Capderou,which presents a better estimate of global solar radiation with a small error between the measured values and those calculated. The set of studies was done for the Biskra site, horizontally.
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