A Detailed Guide on Solar Chimney Power Plant: Working, Advantages & Applications

Today, solar-powered chimneys are emerging as a commonly utilised building design element that works to build up comfortable environments inside an infrastructure. A chimney power plant is a passive solar heating and cooling structure. 

A solar power chimney is also called a thermal chimney or thermosiphon plant. It is used to manage the temperature of a building and maintain the requisite ventilation. 

This chimney is a passive channel that uses environmental conditions to produce cool air within buildings and get rid of hot air or vice versa.

A solar chimney power plant is specifically effective when it is set up in an area where it can receive direct sunlight. The structure of a chimney can be modified to gain maximum efficiency by adding multiple chambers to expand the surface area or include materials that absorb the most heat, such as a black frame, insulated glazing, and more.

If you want to know more about the working of solar power chimneys, the advantages, and other aspects of a chimney power plant, this guide is a goldmine of information. Dig in!

Working of Solar Chimney

A solar-powered chimney is a tall structure having a dark surface and a matte finish. It is designed to face the sun and absorb solar radiation. 

A solar chimney power plant works on a similar principle to a fireplace. The heat rises to the top of the chimney naturally, and cool air gets in from the bottom. 

In the solar-based chimney, the sun is the factor that heats the air and makes it rise. This enables cool air to be pulled from the bottom into the warm and vented chimney. Such a process of raising the hot air and introducing the cool air offers ventilation in the chimney, which helps cool the building.

Conversely, a solar chimney also heats buildings when the weather turns colder. In this case, the ventilation outlet at the top of the chimney power plant that usually dissipates the hot air is closed, and interior vents remain open. This enables the hot air to move back into the building.

Hence, it serves various functions, as per requirement. Now, let us proceed further to discuss how a chimney power plant offers multiple benefits.

Advantages of Solar Power Chimneys

There are several advantages of using a solar-based chimney to adjust the air temperature inside buildings or other infrastructures. Here are some of them: 

  • – A solar power chimney has a relatively lesser impact on the environment than a traditional chimney that emits smoke. The solar-based chimneys pour out hot air. It does not emit carbon dioxide, so there is no pollution.
  • – A chimney power plant is a cost-effective solution for cooling and heating compared to air conditioners or conventional heating systems. Also, no electricity or gas is required to operate the solar chimney.
  • – This power plant demands lesser maintenance than conventional systems as it does not need any actual mechanics. It does not get affected by power outages or breakdowns either. 
  • – The solar-based chimney system operates 24 hours on solar energy. It is because of its heat storage system. The water tubes under its glass roof collect a part of the solar energy available in the daytime and transfer it into the collector at night.
  • – Even economically poor countries can build a large solar-based chimney power plant without high expenditure by using their indigenous resources and workforce. It generates considerable employment and minimises the capital investment required.

Things to Consider When Preparing for a Solar Chimney Power Plant Installation

One of the most crucial things to consider when planning to install a solar-based chimney plant is its placement. The solar chimney must be set up on the rooftop of a structure. It must be installed in an area that receives considerable sunlight. 

The ideal setup is to install the chimney in an area that is hit by the sunlight all across the peak sun hours. Also, it is significant to consider the design and thermal features of the solar chimney. 

The ideal heat absorber material includes a black frame, tinted glass, and insulated glazing. Besides, the size of the solar-powered chimney is also a vital consideration. Notably, the larger the chimney power plant, the more efficient it is.

Applications of a Chimney Power Plant

The solar-based chimney plant is a natural ventilation system that is capable of minimising power consumption in buildings as well as maintaining a cosy indoor environment. 

A solar chimney is suitable for both residential as well as commercial applications. Direct sunlight helps to warm up the air inside the chimney. The hot air rises to the top, and cool air is drawn from the bottom opening. 

This movement of hot and cool air can be utilised to ventilate a home, office, or any commercial setup. It can also be used to ventilate a specific area. The all-in-all solar-powered chimney is a large-scale power generator.

In the initial stages of chimney power plant development, it was specifically used for space heating. However, it is presently utilised for heating and building ventilation as a replacement for power-consuming mechanical ventilation.


As customers are considering more eco-friendly and renewable energy options to heat and cool their buildings, chimney power plants are becoming a favourable choice. 

The solar chimney does not require any combustible fuel but only the sun to harness solar radiation. Remarkably, a solar-powered chimney plant contributes to turning the dream of sustainable green homes into a reality. 


Q. What are the advantages of a solar-based chimney power plant over traditional power generation systems?

Here are some key advantages of a chimney power plant over conventional systems:

  • – Easier to design
  • – Lower cost of power generation
  • – More reliable & lesser running components
  • – Easier maintenance and overhaul
  • – No environmental pollution
Q. A thermal chimney plant works effectively in what type of climatic conditions?

A chimney power plant is specifically effective in hot and humid climates. It should be designed tall but not deep to maximise the surface area for better heat absorption. 

Q. What is the use of a solar chimney in cooler conditions?

In cold climatic conditions, a solar power chimney is utilised to direct the heat generated back into the house or building.