Solar chimney

A thermal chimney, or a solar chimney, is an innate method of finely ventilating the buildings by making use of an activity of heated air by inactive solar energy. A common definition of a thermal chimney is an erect pipe which uses the solar energy to better the ventilating process of a building. The thermal chimney has been used by the people of Rome and mainly in the Middle East, for centuries now. 

For a common man, a thermal chimney is a black erect pipe. At day time, the energy of the Sun warms the chimney and also the air beneath, thus making the air move upwards. Here, it creates a process of sucking of air towards the base and cools the building by ventilation. In many places, it is much comfortable to rein in power of the wind for ventilating, as done with a Badgir. However, a thermal chimney can also ventilate the building on days of less or no wind, which wouldn’t otherwise be. 

A thermal chimney has many variations, and the primary constructive features of such a chimney are:

• Area of sun energy collection: This can be placed on the chimney’s top, and can even admit the whole shaft. The orienting, manner of glazing, insulating and the thermal elements are vital for tackling, using and maintaining the gains from the Sun.
• Shaft of the main ventilation: Here, the placement and vertical distance, cross-section and thermal elements are very crucial.
• Air apertures for inlet/outlet: The sizing, placement and also the facets of air dynamics of the 3 constituents are vital. 

A theory has been invented for generation of solar power, which utilizes a huge glasshouse at the bottom of the chimney, instead of depending upon the entire chimney for heating. 
Ventilation by conditioning of air and machines has been the norm of protecting the environment since many years, especially at offices. The problem of global warming, high levels of pollution and continuous decrease of supply of energy has led to a new approach to design buildings. This has resulted in innovations being used with many scientific generalizations and traditional approaches, which are blended to come up with new and expectedly eminent designs. The thermal chimney is a result of these specializations worked upon by scientists and architects, mainly by researches and experiments.
 
A thermal chimney is very useful. A straightforward benefit heats up the air within resulting in the warm air being blown out from the bottom, thus cooling it. This suction of air from the bottom can cool the home/workplace, and it can also be utilized for ventilation of some specific places as well, like a kitchen.

Naturally-occurring ventilation can occur if one provides a blowhole in the top places of buildings which would permit the hot air to rise by natural action, and be blown outside. Simultaneously, cool air can be sucked in by similar blowholes placed at the bottom levels. To give room for enough cool air to be sucked in, trees can be strategically placed on the exterior.

This process can be accelerated by using a thermal chimney. This chimney has to be of a height bigger than the building itself, and must be placed on a wall which faces the Sun. By using a candied platform, greater solar energy can be absorbed from the side which faces the sun, while the channel to absorb heat should be located on the other side. Even of a greater importance than the chimney’s diameter is the sizing of the material which absorbs heat, bigger of which permits greater inflow and outflow of heat with the required air for warming by using the Sun rays. Warming the air beneath the chimney will also increase the convection resulting in greater flow of air through it. It should be kept in mind that the chimney’s vent’s opening should be facing a side other than the focus of the moving wind at that point of time.

To cool the place even more, the air which is sucked in can be bought in underground before letting it into the building. The efficiency of the thermal chimney can be enhanced by combining it with trombe wall, which will result in further benefit of reversing the entire system at times of the winter season, where the building can be warmed instead of being cooled.
A thermal attic is a different dimension of the thermal chimney, which is burning hot during summers. In poses a problematic situation for a traditional building since it necessitates enhanced conditioning of the air. So by combining it with the thermal chimney, the attic can work better by causing convection inside the thermal chimney and increasing ventilation.
The utilization of a thermal chimney may result in naturally-occurring ventilation, and also in cooling buildings hence aiding the less usage of energy, carbon dioxide outflow, and less pollution. Some inherent benefits accrued are:

• Enhanced ventilation during intense summers
• Less dependence on wind powered ventilation
• Efficient controlling of flow of air through a building
• More options of intake of air
• Improved quality of air and reduction in sound levels in big cities
• Enhanced ventilation at night
• Permitting ventilation of tiny spaces with zilch vulnerability to outside products

Other advantages of cooling in a passive way may be summarized as:

• Better passive cooling at times of hot climate
• Better cooling during the night
• Better carrying out of the thermal weight
• Better thermal solace (owing to enhanced flow of air and reduction in draught)

An applied science directly linked to the thermal chimney is the cool tower enabling evaporation. In warm areas, this method would help provide a good way for helping the building in air conditioning.

The main methodology is to permit water to evaporate from the crest of the building, which can be achieved by the usage of evaporation-prone chilling pads or by the spray of water. The evaporating of water reduces the temperature of the incoming air, which cools the inner temperature of the building as well. The flow of air can be enhanced by utilizing a thermal chimney on the contrary part of the building to aid the outflow of hot air. This principle has been made use of for benefit of visitors at the Zion National Park, the center of which was created by the highly skilled NREL (National Renewable Energy Laboratory) experts.

This methodology has been put forward for approval for generating solar energy as well!