China
Africa
Explore chapters and articles related to this topic
Passive Solar Heating, Cooling, and Daylighting
Published in D. Yogi Goswami, Principles of Solar Engineering, 2023
The stack effect can induce ventilation when warm air rises to the top of a structure and exhausts outside, while cooler outside air enters the structure to replace it. Figure 7.6 illustrates the solar chimney concept, which can easily be adapted to a thermal storage wall system.
Individual Components of HVAC Systems
Published in David W. Bearg, Indoor Air Quality and HVAC Systems, 2019
Unintentional air intakes located away from the mechanical room typically occur at the lower levels of the building and are due to the stack effect. The stack effect refers to the phenomenon where heated air, being more buoyant than the colder air outdoors, escapes at penetrations in the upper levels of a building and this leads to replacement air being drawn into the building at lower levels. The magnitude of this pathway will again depend on the availability of penetrations (i.e., the leakiness of the building) and the pressure differential created by the indoor/outdoor temperature difference and the height of the building. Examples of investigations into unintentional air intakes are presented in Chapter 8.
Building Design and Air Quality
Published in David L. Hansen, Indoor Air Quality Issues, 2018
Intrusion of unfiltered outside air into a building can be increased dramatically by natural forces. For example, a stack effect occurs as warm inside air rises in a building and the pressure differential sucks in cooler air on the lower levels of the building. Also, the wind can cause pressure differentials between the windward side of a building and the interior, inducing unfiltered air to enter a building.
Performance improvement of turbo ventilators with internal blades
Published in Advances in Building Energy Research, 2018
P. M. Ghanegaonkar, Ganesh K. Jadhav, Sharad Garg
Stack ventilation concept has been initially used in buildings, especially when natural cross-ventilation is insufficient. However, this strategy is dependent on the temperature difference between the indoor and outdoor of buildings as stack ventilation is governed by temperature difference inside and outside a building. Many innovative elements, devices and strategies based on the stack ventilation concept have been developed to overcome the limitation of stack effect. Turbo ventilator is not only an energy-efficient device to improve indoor thermal environment, but also enhances the aesthetic appearance of buildings and factories (Ismail, Malek, & Rahman, 2012). Due to the threat of global warming, maintenance of a healthy environment and ventilation system should be adopted with higher performance at all the workplaces. Nowadays, an appropriate ventilation system is a must in all industries in order to maintain a healthy indoor environment for the safety of employees. The turbo ventilator is used as common ventilation device due to its initial investment, improved efficiency, simple operating mechanism and low maintenance cost. Turbo ventilators are maintenance free and a sustainable solution for providing comfortable indoor environment for buildings and industries. The use of turbo ventilators reduces the cost of ventilation. The first patent on the model of turbo ventilator was taken by Meadows (1929). It was considered as a one of the important types of roof ventilation system. The same concept was developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (2011) (HVAC Applications, 2011).
Evaluating the sustainable features of vernacular architecture in hot-arid regions: field surveys and analysis in two vernacular houses in Al Batinah region (Oman)
Published in Architectural Engineering and Design Management, 2023
Aliya Al-Hashim, Naima Benkari, Saleh Al-Saadi
Thanks to its orientation to the North, the arcade area has the lowest temperature relative to other spaces of the house. However, the courtyard area has the highest temperature (Figure 8). Because of its low density compared to the cool air, the hot air rises in the space, and it is replaced with air from the surroundings. This movement is a result of convection and leads to the ‘stack effect’ phenomenon. This effect is clearly witnessed in both of the studied houses (Figure 9, Figures 14–15).