Experimental Analysis and Modeling of the Collector And Absorber Temperatures of the Solar Chimney as a Function of Solar Radiation, Ambient Temperature, and Position
نویسندگان
1 Department of Mechanical Engineering, Faculty of Tehnnology, University of M’sila, P. O. Box: 28000, M’sila, Algeria.
2 Laboratory of Materials and Mechanics of Structures (L.M.M.S), University of M’sila, P. O. Box: 28000, M’sila, Algeria.
3 Department of Mechanical Engineering, Faculty of Tehnnology, University of M’sila, P. O. Box: 28000, M’sila, Algeria.
4 Department of Mechanical Engineering, Faculty of Tehnnology, University of M’sila, P. O. Box: 28000, M’sila, Algeria.
5 Laboratory of Water, Environment and Renewable Energies, University of M’sila, P. O. Box: 28000, M’sila, Algeria.
doi
10.30501/jree.2025.497013.2217چکیده
The solar chimney is an innovative technology that harnesses solar energy to generate electricity sustainably. This experimental study presents a modeling approach for predicting collector and absorber temperatures in a small solar chimney prototype. Temperatures were measured at five positions on the collector and absorber under varying solar radiation and ambient conditions. The results demonstrate that local temperatures at each position can be accurately represented by a second-order polynomial regression of solar radiation and ambient temperature, with R² values ranging from 0.973 to 0.989 for the collector and from 0.9619 to 0.9835 for the absorber. A key innovation of this work is the generalization of these local models into a unified thermal model capable of predicting temperatures at any point on the collector or absorber surface. This was achieved by expressing the regression coefficients of the local models as fourth-order polynomial functions of the radial position. Model validation using statistical indices—including R², RMSE, NRMSE, and NSE—demonstrated strong agreement with experimental data. For the absorber, R² = 0.974, NRMSE = 0.0174, and NSE = 0.974; for the collector, R² = 0.9802, NRMSE = 0.0194, and NSE = 0.98. These results confirm the accuracy of the generalized model, providing a practical tool for simulating thermal fields in solar chimneys and optimizing system performance with reduced experimental effort.
