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The rising warm air reduces the pressure in the base of the building, drawing cold air in through either open doors, windows, or other openings and leakage. During the cooling season, the stack effect is reversed, but is typically weaker due to lower temperature differences.
Instability of laminar jets Unstable water jet. Flow instability is the engine for whistles. It converts steady energy to time-dependent energy. An example is shown in the figure on the right with a water jet. [3] The laminar two-dimensional jet amplifies small disturbances at the orifice to generate a vortex street. For this case, the flow ...
A condensing forced-air furnace; flue pipes are plastic, not metal, because of the low waste-gas temperature. Plastic outlet for a condensing natural gas hot air furnace. Not all the water vapor is condensed; some freezes at the outlet. This vent contains a coaxial combustion air inlet pipe.
In a water boiler, draft is the difference between atmospheric pressure and the pressure existing in the furnace or flue gas passage. [1] Draft can also be referred to as the difference in pressure in the combustion chamber area which results in the motion of the flue gases and the air flow.
A safety valve allows water to escape from the system when pressure becomes too high, and a valve can open to replenish water from the normal water supply if the pressure drops too low. Sealed systems offer an alternative to open-vent systems, in which steam can escape from the system, and gets replaced from the building's water supply via a ...
Fireplaces are one of the biggest energy wasters when the flue is not used properly. This occurs when the flue is left open too wide after the fire is started. Known as convection, warm air from the house is pulled up the chimney, while cold air from outside is pulled into the house wherever it can enter, including around leaking windows and ...
After much deliberation, the College Football Playoff committee chose SMU over Alabama for the final spot in the 12-team field. See the full schedule.
When air is forced into a cavity, the pressure inside increases. When the external force pushing the air into the cavity is removed, the higher-pressure air inside will flow out. Due to the inertia of the moving air the cavity will be left at a pressure slightly lower than the outside, causing air to be drawn back in. This process repeats, with ...