Experimental Investigation for a Laboratory Solar Chimney; A Practical Study in Iraq

Ehsan Fadhil Abbas

Abstract


The solar chimney is a type of passive solar system, used for power and ventilation purposes. For the past decade, a lot of theoretical and experimental studies have been done to improve the thermal performance of a solar chimney by changing some design parameters. The aim of the present work is simulating the thermal performance of a solar chimney system that was investigated based on two parameters, such as heat flux and air gap height under monitored operating conditions in the laboratory. For this purpose, a small solar chimney was built in the laboratory/Kirkuk Technical College. Experiments were conducted on the chimney by choosing three air gap heights 3, 4.5 and 6 cm, and the heat flux variation from 125 to 1000 W/m2 in eight steps. The simulation results show that the maximum air velocity entering the chimney obtained at a 3 cm air gap height, which is about 2.29 m/s at a heat flux of 1000 W/m2, it was higher than the velocity of air gaps (4.5 and 6) cm by (3.6% and 10.6%). The average temperature of the hot plate was also affected by the width of the air gap, as the maximum temperature at the air gap was small. The results also indicate that the maximum thermal efficiency of the system obtained at a height of 3 cm, which is about 25% at a heat flux of 1000W/m2. On the other hand, the highest chimney efficiency is obtained at a height of 6 cm.

Keywords


Small solar chimney, Laboratory solar chimney, performance of solar chimney.

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DOI (PDF): https://doi.org/10.20508/ijrer.v10i2.10974.g7977

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