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Green Smart Buildings for Smart Cities
Published in Pradeep Tomar, Gurjit Kaur, Green and Smart Technologies for Smart Cities, 2019
Dushyant Singh Chauhan, Gurjit Kaur
A solar chimney is an example of both a passive cooling and heating system. The temperature and ventilation of a building can therefore be controlled by a solar chimney. The solar chimney directly gains warm air and causes it to rise while collecting cool air from the bottom. CO2 emissions, energy use and pollution can be reduced by using a solar chimney, which helps in benefiting the passive cooling and natural ventilation policies of buildings (Chaichan et al. 2018) and hence contributes in moving towards a much greener building structure.
An Introduction of Zero-Energy Lab as a Testbed: Concept, Features, and Application
Published in Amritanshu Shukla, Atul Sharma, Sustainability through Energy-Efficient Buildings, 2018
Solar chimney for ventilation: The solar chimney in the ZØE Lab is a south-facing chimney with dimensions of 4.12 m in height, 2.108 m in width, and 2.238 m in depth. The north wall, which is the absorber wall, runs 4.013 m in height and is composed entirely of gypsum board and is painted white for its full length. The other three walls (south, east, west) have two parts. The upper part has been made of Low-e glass windows for 1.87 m; the lower part is composed of three brick walls for 1.34 m. The inlet height of the chimney is 0.61 m and the outlet height is 0.305 m. The roof and outer walls of the solar chimney are made of steel-faced SIP panels. Outer and inner views of the chimney can be seen in Figure 2.3 [38]. A solar chimney is a technique providing necessary ventilation to a building using natural stack effect. The solar energy enters the glass windows and heats the wall which results in an increase of temperature, the air inside will be ultimately heated. Due to this increase in temperature, the density of air inside the chimney decreases and the air rises up and is vented out through the outlet of chimney and its place is taken by cooler air from the building by virtue of stack effect. This is known as natural ventilation which contributes significantly to reducing energy consumption in buildings.
Harvesting Solar Energy: Fundamentals and Applications
Published in Prasenjit Mondal, Ajay K. Dalai, Sustainable Utilization of Natural Resources, 2017
Syed Shaheer Uddin Ahmed, Sayedus Salehin, Md. Mustafizur Rahman, A. K. M. Sadrul Islam
Solar chimney is a device that uses solar energy to heat the air by convection heat transfer, which can be used to improve the natural ventilation of buildings. It can also be used to generate electricity. Owing to its potential benefits in terms of low operational cost, energy uses resulting GHG emissions. Solar chimney systems are being increasingly proposed in Asia, Middle East, Africa, and Europe for ventilation and power generation. The sun is a huge source of energy supply. This gigantic source of energy can be used in home ventilation as well as in power generation by using solar thermal chimney. It is becoming popular in the areas where the intensity of solar radiation is very high.
3D numerical simulation of a novel ventilated roof: thermal performance analysis and fluid flow behavior
Published in Science and Technology for the Built Environment, 2021
Michele Calati, Luca Doretti, Claudio Zilio, Simone Mancin
Among the passive strategies, the use of different buoyancy-driven air flows techniques has been considered rather attractive in several works. Khanal and Lei (2011) reviewed all the research works on solar chimneys from 1990s till 2011. They stated that the solar chimney is an excellent passive ventilation strategy since it can enhance the natural ventilation assuring an adequate human thermal comfort. Jiménez-Xamán et al. (2020) numerically investigated and compared the thermal performance of a ventilated room with and without a rooftop solar chimney. They found that during the summer season, the ventilation was improved by 8-45% due to the presence of the rooftop solar chimney. Therefore, the authors stated that this promising technique can be employed as a passive ventilation system. Santamouris and Kolokotsa (2013) comprehensively reviewed passive cooling technologies which decrease the cooling loads of thermostatically controlled buildings providing, at the same time, comfort in non-air-conditioned ones. They affirmed that 70% of energy saving can be reached through the implementation of appropriate passive technologies.
Phase change material infiltrated 3D porous carbon interconnected composites for thermal energy storage
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022
Rabia Sattar, Tehmeena Ishaq, Anam Afzal, Rubina Mukhtar, Asima Naz
For simultaneous natural ventilation and power, Cao et al. presented PCM impregnated photovoltaic hybrid panel and solar chimney system (Figure 7(b)) (Cao et al. 2021). A solar chimney is a natural interior air ventilator that operates without the use of electricity. The main finding is that the increased heat capacity of the PCM can increase the electrical power generation capacity of the chimney while reducing the mass flow rate of the air and outlet air temperature as well. Meanwhile, the thermal conductivity, enthalpy, and melting point of PCMs are directly related to the electrical performance of the composite structures. This research may be able to overcome the difficulties associated with mechanical ventilation, which needs a large amount of electrical energy.
Cooling performance of a passive hybrid system consisted of domed roof and solar chimney: A numerical approach
Published in International Journal of Green Energy, 2022
Solar chimney is a passive system that improves the natural ventilation of buildings by using heat transfer from the air heated by solar energy. This system consists of an air channel (chimney conduct) between vertical walls and a black absorber plate, usually inclined, at the exit on the top of the chimney conduct that uses solar energy to induce buoyancy driven airflow which increases the natural ventilation inside the building. Solar chimney has been used for centuries, especially in the Far East and the Middle East by the Iranians and in Europe by the Romans (Figure 1) (Afonso and Oliveira 2000).