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In order to prevent the spread of fire and hazards, in high-rise buildings, fire and smoke exhaust design must be carried out. 1) The distance from the inside of the turn or elbow of the duct to the inlet of the fan shall be greater than the diameter of the inlet of the fan, which is to ensure uniform airflow into the fan impeller. When encountering fire, it extracts high-temperature indoor flue gas to enhance indoor air circulation. Wind pressure and air density difference between indoor and outdoor.
The smoke refers to the floating state of solid and liquid particles in the air produced by incomplete combustion of substances. The purpose of fire prevention is to prevent the spread of fire and extinguish the fire. The equipment for this treatment process is called dust removal equipment.
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A well-designed ventilation system results in better health for your employees as well as reduced risk for workplace accidents. Coupled with the greater influence of the height of the high-rise building shaft, the hot-pressure increases significantly, and the smoke will spread upward along the building shaft. The distance between the bottom of the air inlet and the outdoor ground is generally not less than 2cm to avoid inhaling ground dust. 5) There should be a straight pipe section with a diameter of less than 3D from the outlet of the fan to the turn to avoid unnecessary static pressure loss. The connecting pipe of the inlet and outlet of the fan has a great influence on the performance of the fan. The air duct should be provided with necessary adjustment and measuring devices or reserved for the interface of the measuring device.
Fresh air supply and exhaust vents can be installed in every room to ensure a contant flow of fresh air required as per the ASHRAE norms while venting out the indoor air. The units are fitted with HEPA filters to ensure outdoor air is filtered before it enters indoors. Energy recovery fresh air units retain 80% of the energy from the indoor air which is used to cool /warm the air coming indoors to maintain ambient indoor temperatures. Exhaust ventilation systems are relatively simple and inexpensive to install.
Heating Ventilation Air Conditioning System
A balanced ventilation system usually has two fans and two duct systems. Fresh air supply and exhaust vents can be installed in every room, but a typical balanced ventilation system is designed to supply fresh air to bedrooms and living rooms where occupants spend the most time. It also exhausts air from rooms where moisture and pollutants are most often generated . Energy-efficient homes -- both new and existing -- require mechanical ventilation to maintain indoor air quality.
After fabrication and installation, a well-designed ventilation system removes the contaminated air in minutes. Even faster in some cases, depending on the size of the room and fans. The flow and diffusion of smoke is mainly influenced by factors such as wind pressure and thermal pressure. There are many types of dust removal equipment, including baffle dust collector, cyclone dust collector, bag type dust collector and spray tower dust collector and electric dust collector etc. 4) The turning near the outlet of the fan must be consistent with the direction of rotation of the fan impeller to make the air flow unobstructed and even and avoid unnecessary energy loss. According to different occasions, it is possible to change the installation angle, the number of blades, the rotational speed, the machine number and other methods to meet the requirements of various uses.
4. Double doors
The trick is in selecting the right style of ventilator window, like it is done here. The shutter of the window, when open, will horizontally divide the window in two parts. Hot air will leave the room from upper portion since warm air has the tendency to move up and cool air will rush to fill the empty space from the lower opening. There will be sufficient supply of fresh air even through the small vent. Believe it or not, we Indians avoid opening our windows and prefer to keep the air-conditioning running. It’s not that we don’t like fresh air or cut down on our electricity bills.
I do a lot of thinking, reading, and writing around sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. When using thermistor, thermocouple and bimetal etc., the valve is closed by driving the micro motor controlled with sensors and electronic components. When the fusible ring is used, the fusible ring will fuse and fall off in case of fire, and the valve will be closed by spring force or self-gravity. Fire dampers can be controlled by thermal components, smoke sensing thermostats and compound control etc.
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Dilution systems require less maintenance and are the best ventilation choice for mobile or dispersed contaminant sources. Mechanical smoke prevention is a smoke prevention technology that adopts a mechanical pressurized air supply method to control the flow direction of the flue gas by the gas flow and pressure difference generated by the fan. Air Ventilation is the intentional movement of air from outside a building to the inside. Air Ventilation used for providing acceptable indoor air quality. The vents or flues carry the impurities to be expelled from the building, in a way which does not cause harm to the occupants of the building.
The cool air is then directed into the required space, and pushes warmer air out through the given vents. Some of this return air might be recalculated back into the fresh air supply to save energy. When planning for a system, consider where the source of contamination is. But that’s not always convenient or efficient in some work environments. To keep indoor air quality at it’s best, how the air pollution control system is designed or installed is important for efficiency. Because they require two duct and fan systems, however, balanced ventilation systems are usually more expensive to install and operate than supply or exhaust systems.
The purpose of the smoke exhaust is the fire smoke will be eliminated in a timely manner, which is to prevent the spread of smoke to the outside and ensure the success of evacuation for indoor people. To prevent the exhaust air from being sucked back into the system, the air inlet should be located on the upwind side of the exhaust air outlet and lower than the exhaust air outlet. Because the dynamic pressure of the air at the inlet and outlet is very high, improper connection pipe practice will cause considerable head loss, and severely punished loss of air volume. Since wind pressure is influenced by the weather, outdoor wind direction, building shape, surrounding environment and other factors, the joint action of wind pressure and hot-pressures is not a simple linear superposition. As a result of the temperature difference, a difference in density between indoor and outdoor is created and a pressure gradient is created along the vertical direction of the building wall. To avoid internal Biological and also another kind of pollutants in a room, Process area or an auditorium fresh air circulation have to be improved much.
For this these Air Ventilation Fan are being utilized to create natural of forced draft in the open area. These fans are much useful to increase the air cycles in the required area. These pollutants are a particular concern when bath fans, range fans, and clothes dryers are run when an exhaust ventilation system is also operating. The exhaust system has an air intake area, ducts that move air from one area to the next, an air cleaning device, discharge stacks, and fans. Both ends of the system work together to remove a wide range of contaminants from the area. During a fire, if a window is on the windward side of the building, the wind pressure effect can cause smoke to quickly spread throughout the lost floor and even blow it into other floors.
Like both supply and exhaust systems, balanced ventilation systems do not temper or remove moisture from the make-up air before it enters the house. Therefore, they may contribute to higher heating and cooling costs, unlike energy recovery ventilation systems. Also, like supply ventilation systems, outdoor air may need to be mixed with indoor air before delivery to avoid cold air drafts in the winter.
Like exhaust ventilation systems, supply ventilation systems do not temper or remove moisture from the make-up air before it enters the house. Thus, they may contribute to higher heating and cooling costs compared withenergy recovery ventilation systems. Because air is introduced into the house at discrete locations, outdoor air may need to be mixed with indoor air before delivery to avoid cold air drafts in the winter. An in-line duct heater is another option, but increases operating costs. Fresh air systems for homes is a balanced ventilation system that usually has two fans and two duct systems.
Wind pressure refers to the pressure generated when the wind blows to the external surface of a building, due to which the air flow is hindered, the speed is reduced and part of the kinetic energy is transformed into static pressure. For cities with serious air pollution and noise pollution, direct natural ventilation will also bring polluted outdoor air and noise into the room, which is not good for human health. Hot-pressing is caused by the temperature difference between indoor and outdoor air, which is known as the “chimney effect”. In the entire control space, trying to make the indoor airflow uniform and reducing the existence of eddy currents are needed to avoid the accumulation of pollutants in local areas. We are highly engrossed in offering a quality assortment of Axial Flow Fan. The offered fan is extensively used for external or internal and designed to attain a high level of air ventilation.
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