Chimney impact, or chimney effect, is the movement of air in and out of a house through unsealed openings, chimneys, chimneys, or other boxes resulting from air buoyancy. Buoyancy is created by differences in internal and external air densities as a result of differences in temperature and humidity. The net result is that both chips in the stack have either good or poor buoyancy. The greater the temperature difference and the larger the tip of the shape, the greater the buoyancy, resulting in greater stacking shock. The
stack effect promotes herb airflow, air penetration, and tip fires through either open windows, vents, or accidental holes in stacked dies , such as ceiling fans and recessed lights. is useful for Rising warm air reduces the load in the building by drawing in cool air through both open doors, windows in the house, or other openings and leaks. Throughout the cooling season, the chimney effect reverses, but is usually weaker due to less temperature change. In the current design of the
with its high thrust and well-sealed envelope, stacking effects can create large stress differentials that need to be considered in the layout and possibly addressed with mechanical airflow. Stairs, shafts, elevators, etc. usually contribute to the chimney effect, but interior walls, floors and hearth partitions can mitigate it. , the chimney effect must be managed in order to create conditions acceptable to residents and firefighters. Natural airflow methods, such as installing air diffusers in the ground, can be powerful, but high-rise buildings and homes with limited space usually prefer mechanical ventilation. Smoke emissions are a major concern in new construction and should be evaluated at the floor plan level. Two regimes of
stack influence can exist in the home: everyday and opposite. A normal chimney occurs in homes that can keep a better temperature than the outside environment. Warm air inside a building is less dense and more buoyant. Therefore, it rises from the lower tier to the upper tier through the penetrations between the floors. This leaves the floors below the neutral axis of the building with a severe net stress and the floors above the neutral axis with a net effective pressure.
Due to the low mains voltage on the lower floors, outside air may enter the building through doors, windows, or ducts without check valves. Heated air attempts to penetrate the building envelope from floors above the neutral axis. A mechanical chiller provides considerable potential cooling at some point during the summer. This lowers the dry-bulb temperature of the air inside the building compared to the ambient air outside. It also reduces the respective volume of air contained within the building, reducing buoyancy.
As a result, cold air flows vertically through the building via the elevator.for more details
