Experimental study in natural convection

Abstract

The study of thermal and ventilation parameters, obtained in a transient, laminar solar chimney of reduced dimensions, (1 < m <3) m with a square collector (side = 2m) is presented. Experimental measurements has been made to determine the temperature of the absorber and the fluid in the collector, it is shown that at the entrance of the chimney, the temperature of the absorber decreases slightly while that of the fluid is maintained at a maximum level. Temperature differences were observed up to 32°C between the atmosphere and the fluid in April. A temperature variation at the absorber depending on the stack height is presented. Temperature measurements in the chimney, at various heights depending on the axial coordinate, show a variable temperature profile. It is, from these, shown that, in the selected interval of stack height, the average speeds of output increase linearly as a function of stack height. For a chimney of 3m in height and 20cm in diameter, a maximum speed of approximately 0.7 ms -1 was observed. The lack of appropriate equipment handicaps the velocity measurement at the chimney entrance. Thus, the results of simulations with the computer code COMSOL 5.1 has confirmed temperature values measured at the chimney entrance and after this, velocity values are determined.

Contribution to the Modeling of a Solar Adsorption Refrigerator under the Climatic Conditions of Burkina Faso

“…In addition, these machines use refrigerants such as water [6], methanol [7] and ammonia [8], which have no effect on the environment. For countries such as Burkina Faso, with favorable sunshine with an average irradiation between 5.5 kWh•m −2 •day −1 and 65 kWh•hm −2 •day −1 [9], solar adsorption refrigeration is a promising solution to meet important needs such as food preservation, pharmaceuticals, air conditioning, etc. and also to reduce electricity consumption.…”

Performance Optimization Study of an Adsorption Solar Refrigerator System with Special Reference to the Effect of the Collector-Adsorber Tilt Angle

“…Adsorption solar refrigeration units are suitable in countries like Burkina Faso, endowed with favorable sunshine with an average irradiation between 5.5 kWh.m 2 day -1 and 6.5 kWh.m 2 day -1 [6]. In addition, these machines operate without any moving parts, with no noise pollution.…”

Energy Analysis of the Performance of a Solar Adsorption Refrigerator

“…The energy deficit in Burkina Faso is very high and several areas do not have access to the electrical network. However, the country has a good sunshine with an average irradiation between 5.5 kWh.m -2 day -1 and 6.5 kWh.m -2 day -1 [5]. Thus, studying, modeling, simulating, dimensioning, designing adsorption solar refrigeration systems appear as promising solutions to answer the important issues of cold, the improvement of living conditions and the reduction of the excessive consumption of electrical energy [6].…”