Abstract
A combined solar chimney is proposed in this paper that integrates an inclined-roof solar chimney with a traditional Trombe wall. The ventilation performance of the combined solar chimney is analyzed numerically and then compared with the Trombe wall and the inclined-roof solar chimney. The feasibility of different operation modes and the ventilation effect under different environment conditions are also discussed. The results show that when the ambient temperature ranges from 298 to 303 K in the summer, a natural ventilation mode is appropriate. Otherwise, an anti-overheating mode is recommended. When the ambient temperature is lower than 273 K in the winter, a space heating mode has a better heating effect. A preheating mode can be employed to improve the indoor air quality when the ambient temperature is higher than 278 K. The simulation results indicates that the ventilation effect of the combined solar chimney is better than that of the Trombe wall and the inclined-roof solar chimney, and the problem of overheating can be avoided. The study provides guidance for the optimal operation of a combined solar chimney.
Highlights
With rapid economic growth and continuous urbanization, the world’s energy consumption is increasing rapidly
The results showed that the combined solar chimney had a better ventilation effect than that of an inclined solar chimney
The structure was composed of a Trombe wall and an inclined-roof solar chimney, which consisted of an external glass cover and an internal storage wall both in the vertical and inclined part
Summary
With rapid economic growth and continuous urbanization, the world’s energy consumption is increasing rapidly. Building energy consumption accounts for 30% of the total energy consumption, mainly for building heating, ventilation, and air-conditioning [2,3,4,5]. Measures of using renewable energy to reduce the energy consumption and carbon emissions of buildings have been promoted to realize the goal of an emissions peak by 2030 and to be carbon neutral by 2060. According to the combination of a solar chimney and a building, there are three main structural types: an inclined-roof solar chimney, a vertical solar chimney, and a Trombe wall solar chimney [7,8,9]. A vertical solar chimney and an inclined-roof solar chimney have a better ventilation effect in the summer but they are not suitable for winter heating. A Trombe wall can be used for both summer ventilation and winter heating. When it is used in the summer, the ventilation flow rate is usually restricted and overheating is inevitable [10,11,12,13]
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