Abstract
Wind catchers are one of the oldest cooling systems that are employed to provide sufficient natural ventilation in buildings. In this study, a laboratory scale wind catcher was equipped with a combined evaporative system. The designed assembly was comprised of a one-sided opening with an adjustable wetted pad unit and a wetted blades section. Theoretical analysis of the wind catcher was carried out and a set of experiments were organized to validate the results of the obtained models. The effect of wind speed, wind catcher height, and mode of the opening unit (open or closed) was investigated on temperature drop and velocity of the moving air through the wind catcher as well as provided sensible cooling load. The results showed that under windy conditions, inside air velocity was slightly higher when the pad was open. Vice versa, when the wind speed was zero, the closed pad resulted in an enhancement in air velocity inside the wind catcher. At wind catcher heights of 2.5 and 3.5 m and wind speeds of lower than 3 m/s, cooling loads have been approximately doubled by applying the closed-pad mode.
Highlights
Wind catchers are small towers with heights between 5 and 33 m raised from the roof of the buildings
Thermal performance of a laboratory scale unidirectional wind catcher equipped with a Thermal performance of a laboratory scale unidirectional wind catcher equipped with a combined combined evaporative cooling system was studied in the evaporative cooling system was studied in the present present paper
Theoretical assessment of the wind catcher was carried out and a set of experiments were were organized to validate the results of the obtained models
Summary
Wind catchers are small towers with heights between 5 and 33 m raised from the roof of the buildings. They serve as a cooling system to provide favorable ventilation and pleasant interior environment with low energy technologies. Wind catchers are commonly constructed in the majority of hot and dry or humid regions [1,2]. A wind catcher usually consists of a chimney, stalk, catgut, chain, and shelf [3]. It works under the influence of two driving forces: buoyant force, which is due to the temperature difference, and external winds [4].
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