Archive for crcuser4

Best Garden Plants for Summer Season

Creating the garden doesn’t mean that you have to spend many hours. It is just a free time activity which allows us to work according to our preferences. In gardening much capital need not to be invested. By spending a little time & effort one can create beautiful garden of their choice. Gardening has many health benefits as it purifies the air and helps us to breath in properly. Read more

Benefits of Using Software as a Service (SaaS)

SaaS stands for software as a service and it is one of the models of cloud computing. It can be considered as an on demand service. Because when an organization or an individual wants to use SaaS for a particular purpose they can avail the service from cloud service provider. The cloud service provides SaaS solution to different organizations for different purposes. Read more

Difference Between Traditional Desktop Web apps and Mobile Apps

Over the past few years, we have seen a tremendous increase in the adoption of smartphones for internet usage. In some countries, the web traffic from smartphones and tabs have exceeded the desktop computers. To compete with the existing mobile market, businesses are developing mobile versions of their existing applications. Read more

Working of a Ventilation System

The working of a ventilation system is broadly explained based on two phenomenon in the system i.e. inlet and outlet of air inside the work place and the circulation of the air inside the work place. These two will decide the working of the system. For different kinds of ventilation systems, the operations may not be the same.

Inlet and Outlet of air in the Ventilation System

  • The removal of contaminated air and the inlet of fresh air is the main use of the ventilation system. This can be done by the aid of fans and tubes. When the fans are in action, they will change the direction of air or let the motion of the air to be fast.
  • Then the air with the motion is allowed to pass through the series of tubes where it is moved out of the working environment as in case of local exhaust or it is mixed with the fresh air in order to make the contaminated air less toxic in the working environment.
  • The inlet and outlet movement of the gas or the contaminated air is done by fans and the gases are captured due to the presence of a small nozzle type arrangement called as hood which will not allow the gases to exit from the tubes.
  • Take the case of dilution system, in which the inlet air is let into the ventilation system and just made to move from one side of the working place to the other place where it is let out of the tubes by the aid of the exhaust fans.
  • Similarly, take the case of the local exhaust system, in which the air is let in at a place and just let out from the other place. Air in the local exhaust system is also subjected to air cleaning.

Circulation of air inside the building

  • The circulation of air is to be done in dilution type of ventilation system. The circulation just reduces the concentration of the toxic air inside the working area.
  • Circulation of air also involves heat recovery system which maintains nominal temperature in the working area. The circulation is also done by the aid of a blower which will allow the air, in more concentrated area to move to the area in the lower contaminated air or fresh air.
  • The main advantage of air circulation is, we need not take fresh air every time from the surroundings and liberate the contaminated air outside. It also saves the excess work.
  • Circulation is also performed by creating low pressure region within the working environment so that the contaminated air can be mixed together attaining equilibrium of the pressure.

In a ventilation system, we can either circulate air inside or move the contaminated air completely outside the work place or we can have both in a single system.

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Different Parts of a Ventilation System

tunnel ventilationEvery mechanical system has parts that make the working easier. In ventilation system too there are certain parts which make a complete system.

Mechanical parts of the ventilation systems

The mechanical systems consists of the series of tubes, air cleaner, blower etc. The mechanical arrangement for a dilution type ventilation is different that of the local exhaust system.

  • Tubes
    • The system must have tubes as it will cause the air to move from one place to another place.
    • They can be made of different materials and different sizes depending upon the requirement of the industry.
    • The tubes may also get corroded as they may be exposed to the toxic gases present in the working area when they are made of any kind of a metal.
    • These tubes have perforations on their surface area in order to inhale the gases or the contaminated air.
  • Air cleaner
    • Air cleaner is usually used in the local exhaust type in order to remove the contaminated air which is taken by the ventilation at the very source.
    • This usually requires a electric power in order to run the air cleaner. Size of the air cleaner may be determined by the type of the industry.
    • In case of industry with toxic gases liberation the chemical process such as oxidation and hydration is carried to remove the gases from the air.
    • In case of material contaminated air a centrifuge is used in order to remove the materials.
    • When a centrifuge is implied, it rotates the contaminated air so that higher weight particles will be settled down.
  • Blower
    • Blower is sometimes used in order to forcibly make a change in the direction of the air.
    • This is used with the dilution type, in order to make the contaminated air mix with the non-contaminated air.

Fans

The ventilation system consists of different types of fans such as Centrifugal blowertube pressurizing fan and exhaust fan.

  • Tube Pressurizing Fans
    • This tube is usually present at the beginning of the source where it takes the contaminated air into it.
    • This fan creates low pressure inside the tube so that the gases will travel quickly inside the tube.
    • These can be made of either iron based alloy and aluminum alloys.
    • Their working is very easy, they just create a low pressure in a region so that the air present around it will be inhaled creating an equilibrium.
    • The surroundings of the pressurizing fan are to be fitted tight, in order to prevent the leakage of contaminated air.
  • Exhaust Fans
    • These fans are usually placed nearer to the outside environment.
    • The exhaust fans just let the contaminated air go outside the working environment.
    • These are similarly made of alloy steel or an aluminum alloy.
    • Exhaust fans are used to create a high pressure so that the contaminated air will be exhaled out to attain the equilibrium.
    • The exhaust fans surrounding are also to be air tight in order to prevent the leakage of air into the workplace.

There are many other parts in the ventilation system such as hoods, shutters, air filter etc which also play an important role in the working of the ventilation system.