Tilt optimization of a double-glazed air solar collector prototype

Abstract

To understand usage of solar air collector there are factors that have influence on the performance. The goal of this paper is to investigate a solar air collector prototype in order to perform a performance optimization using the possible min imum of equations. The thermal efficiency, fluid outlet temperature, heat increase and heat losses of the collector are calculated depending on the collector geometry, fluid properties, fluid inlet temperature, air flow rate, solar insulation and ambient temperature. The calculations were performed using actual data of temperature, wind speed and the global-horizontal radiation Hh over the year 2011 at the international airport of Annaba city. Comparison of results reveals that optimal efficacy is obtained for south facing panels with an inclination angle ß comprised in the interval [15°, 35°]. These conditions provide a useful energy exceeding 4300 W and an efficiency of about 51 %.

On the effect of the transversal aspect ratio on the double‐glazed solar air heater performance

“…The Eismann correlation agrees well with the literature. 23,31,33,47 The optimal gap between the glasses, within [10][11][12][13] mm, led to more accurate results than those of Holland's correlation. 6.…”

“…The SAH useful energy harvested varies linearly between 1855 and 3473 W (Figure 13). The change in the delivered power is due to the wide range of aspect ratios [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. It can be noticed that, for r = 11 up to 19, the increase in useful energy is minor and does not lead to significant improvements.…”

“…Mzad et al 10,11 studied the efficiency and useful energy of double-glazed solar collectors as a function of noontime radiation on typical days in Oran and Annaba, two cities in the western and eastern parts of Algeria. The collector tilt and azimuthal orientation were varied in a wide range to obtain optimized angles, giving maximum efficiency and useful energy.…”

Study of Air Flow in A Solar Collector Equipped with Two Inclined Obstacles

“…Korobka et al [6] Have studied the influence of the value of the radiation on the output of the flat solar collector intended for drying the fruit, they found that for a radiation E = 377 W / m2 allows the output reached 70.7 % while for E = 1000 W / m2 on the contrary small η = 54.6%. Mzad et al [7] wanted to determine the Optimization of the inclination and the orientation of the solar air collector with double glazing the interval of the angles of inclination is between 15 °, 35 ° and also greater than 70 ° They have found that for inclinations greater than 45 ° the intensity of the power delivered by the sensor decreases the intensity of the power delivered by the sensor. While for tilt angles of 30 ° to 45 ° are even acceptable for lower azimuthal angles.…”