Before installing ventilation communications, it is necessary to calculate the area of ducts and fittings. The performance of the system depends on this event, so all calculations require a serious approach. To date, there are two main ways to calculate all the necessary values of the future air-bearing structure. About them will be discussed in this article.
What is the calculation of the area of air ducts and fittings?
Ventilation communication is a complex structure that includes not only pipes, but also a large number of auxiliary connecting elements. Many consumers are interested in the question of how to find the area of the pipe before buying and installing communication.
Note! Conducting proper calculations allows you to determine the required amount of material for the organization of the air distribution network. This allows you to save money and install the optimal system for a particular room, taking into account its features.
Consider what other parameters affect the area of the air ducts:
- the amount of air transported;
- the speed of movement of air masses;
- noise level;
- electricity costs.
To determine the values required for the installation of ventilation, it is recommended to contact the experts. They will help to make the optimal design of the distribution network, however, it requires certain costs. If desired, material counting and other calculations can be made independently. There are several ways to do this.
The air distribution network affects the quality of the microclimate in the room. The main function of such a system is the removal of stale air that adversely affects human health. Before proceeding with the installation of this communication, it is necessary to create a detailed project of it. So how do you calculate the area of the pipe?
A single area calculation is usually not enough to design an optimal air distribution network. There are other important parameters that require attention, namely: the shape of the pipes, the number of connecting elements, the cross-section indicator, etc.
For self-drafting of the project, you must use one of two popular ways:
- use of formulas;
- calculation on the online calculator.
The first method is more complicated, since not every person can correctly use the formula. The second popular option is to use an online calculator to calculate the ventilation ducts. This method is simple, because to perform calculations you just need to specify the parameters of a particular network, and the program will do everything for you.
Special formulas are used to determine the required values as accurately as possible. But this method is not for everyone, as it is rather difficult and takes a lot of time. To calculate the cross-sectional area, you need to know two important numbers. The first of them should correspond to the minimum amount of air transported, and the second – its speed.
Useful information! It is important to remember that the cross-sectional area is a key parameter. It determines how fast the air masses will move through communication. In this case, such a pattern is observed: the larger the dimensions of the section, the lower the air velocity in the network. To calculate the squaring of the duct, you can also use several methods at once, as a result of which it is possible to compare the results.
Air distribution structures with a large cross-sectional area also affect the overall noise level, reducing it. Electrical costs in this case are also reduced. However, to install large-sized ventilation, more material, time and effort are needed.
When calculating the duct section, the shape of the structure plays an important role. Depending on this indicator allocate rectangular and round products. The first ones do not have such high throughput rates as the second ones, because they render greater resistance to the air flow. However, in some situations, their use is more justified. For example, they fit well into the interior (they are mounted end-to-end to work surfaces, as well as pieces of furniture).
The formula for a square sectional area of rectangular communication is calculated as follows:
S = L x 2,778 / V, Where:
S is the area (cm?);
L is the amount of spent air (m? / H);
V is the velocity of the air mass (m / s);
2,778 – the required ratio.
And also using the formula, you can determine the actual cross-sectional area of the air transport network of this type:
S = A x B / 100, Where:
S is an indicator corresponding to the actual area;
A – height;
B – width.
On the Internet, you can find other formulas that allow to calculate the area of a rectangle. In such calculations, experts recommend to be very careful and indicate all values in accordance with the requirements.
Round air transport lines are easy to install and high throughput. This form of pipes allows minimizing resistance to moving air currents. The choice of communication parameters is made depending on the individual preferences of consumers, features of the layout of the premises and the system itself.
When calculating the air distribution network, one important rule must be considered. In order to save materials, the length of the lines should be as short as possible, but the system must cope with the tasks assigned to it. The area of the round channel depends on the amount of air transported and its speed. The formula for calculating the area in this case looks the same way as for rectangular systems (S = L x 2.778 / V).
In turn, the actual area is determined as follows:
S = 3.14 x D? / 400, Where:
S is an indicator corresponding to the actual area;
D is the diameter of the communication;
3.14 – mathematical constant (Pi number).
Useful information! There are special regulatory documents that allow you to compare the dimensions of the pipe sections with the required indicators. This makes it easy to determine the appropriate size of the duct. The most famous of these documents is building codes and regulations (SNiP).
In carrying out the final stages of calculating the area of a circle, it is recommended to take into account certain conditions. For example, the dimensions of the section for each straight section must be noted separately. Be sure to use in the calculations of the resistance exerted on the air flow. Experts also advise starting to make a project from the main (main) channel.
Often, the rate of movement of air masses exceeds the recommended parameters, which affects the figure of noise during operation of the system. To cope with this problem, as a rule, increase the diameter of the flange element of the main channel. You can also purchase special devices – silencers.
In case of problems with self-calculation, it is recommended to seek engineering assistance. It is best to entrust the calculation of the duct area to the competent organization.
The online calculator is a free application that can be easily found on the Internet using a browser search engine. There are some instructions that allow you to understand the nuances of using this program.
The first thing to remember is that all the necessary geometric parameters must be specified in millimeters. This allows you to perform the most accurate calculation of the duct area. An online calculator is also used to determine the dimensions of connecting elements (for example, adapters) and deflectors.
In some cases, the project is made taking into account the number of seams. To do this, in a special window, which, as a rule, is located at the end of the list, you need to tick and enter the corresponding number. To calculate the parameters of the air transport network, you can use fractional values. Then do not forget about the point that plays the role of the separator mark.
After filling in all the fields, it remains to click on the “Calculate” button. The program should immediately issue a value corresponding to the specified parameters. Thus, the use of an online calculator is a simple and fast way to determine the quadrature of communication.
With the help of such simple programs, it is possible to determine not only the parameters of the channel section, but also other indicators. The calculator allows you to find the speed of movement of air masses, resistance and pressure loss in the system, as well as to calculate the duct insulation.
Calculate the rate of air exchange, you can use special tables or using formulas. It is important to know in advance the rate of multiplicity. Does it determine the amount of air needed to ensure normal ventilation of 1 m? rooms for 1 hour In this case, there are also special tables, but the values in them are often rounded. Therefore, experts recommend determining this figure independently by means of formulas.
Consider the formula by which the air multiplicity is calculated:
N = V / W, Where:
N is the multiplicity (number of times / h);
V – the amount of fresh air entering the room for 1 hour (m? / H);
W is the volume of the room (m?).
Each of the above elements plays a very important role in the system and requires a separate calculation. On the Internet, it is not difficult to find an online calculator that will help you to calculate the shaped parts of the air distribution system. The main thing that is required of a person who performs such calculations is attentiveness.
The calculation of air ducts and fittings includes several basic geometrical and physical parameters. Such an operation must be performed without fail before installing a ventilation system. Having understood the formulas, you can determine all the necessary values of future communication without monetary costs. Remember that specialists are able to cope with this task much faster, and in this case the probability of making mistakes will be minimal.