How to correctly calculate the exhaust ventilation in the workplace. Calculation of local exhaust ventilation. The main stages of the calculation of the ventilation system

This article will focus on the design of general mechanical ventilation mainly in public/administrative and industrial buildings. We will not touch here on the issues of emergency and smoke ventilation, as well as local exhausts, showering and thermal curtains.

Consider the fundamental stages of the calculation.

Let's say in advance that nothing new will be written in this article. The calculation is based on the existing regulatory documentation, and specifically SP 60.13330.2012 "Heating, ventilation and air conditioning", and reference books of the Soviet and post-Soviet period, especially beloved by the author, recommendations of foreign equipment manufacturers.

We will immediately make a reservation that in order to make a calculation, it is necessary to have at least a minimum base - a plan of the premises with their purpose.

Calculation of ventilation systems and their design should be carried out by qualified specialists. The technical and design departments of Airkat Klimatekhnik have the necessary competencies and resources for the competent selection of ventilation equipment and the development of ventilation and air conditioning projects.

If you have a finished project

The main stages of the calculation of the ventilation system

1. Required indoor climate parameters

First of all, the parameters of the microclimate of the serviced premises are determined. Here it is necessary to note the following important remark - what parameters we provide: acceptable or optimal. At this stage, it is determined what kind of system we are counting on: ventilation or air conditioning?

This question is important, and quite specifically set out in paragraphs 5.1-5.16 of SP 60.13330.2012.

2. Supply air flow

According to clause 7.4.1 of SP 60.13330.2012: “The required flow rate of supply air (outdoor or a mixture of outdoor and recirculation) should be determined by calculation in accordance with Appendix I, and take the largest of the values ​​\u200b\u200bnecessary to ensure sanitary and hygienic standards or explosion and fire hazard standards ”, - and clause 7.4.2 - “Outdoor air flow in the room should be taken at least:

a) the minimum outdoor air flow, calculated according to Annexes I and K;

b) air flow rate removed by local exhaust systems, general exhaust ventilation, technological equipment, taking into account the normalized imbalance.

If we simplify the formulas given in Appendix AND, then at the output we get the following:

1. For predominantly sensible heat assimilation (when the value of the process beam slope is greater than or equal to 40,000 kJ/kg):

2. For the assimilation of excess moisture:

3. According to the normalized multiplicity:

4. The amount of outdoor air per person in the room:

where:

- excess apparent and total heat fluxes in the room, W;

W – moisture input in the room, kg/h;

k is the air exchange rate, 1/h;

S is the area of ​​the room, m2;

H - the height of the room (for rooms with a height of more than 6 meters, you should stop at this mark), m;

N is the number of people in the room, pcs;

Normative multiplicity are given in the relevant regulatory documents.

Even if we calculate the supply air flow rate by multiplicity, we, nevertheless, must be given certain supply and exhaust temperatures (exhaust air).

If the room is an office, then the parameters of the removed air can be taken equal to the parameters of the internal one.

The inflow temperature must be calculated, but there are certain difficulties. As we can see from the formula for sensible heat assimilation, the air flow will change depending on the temperature difference, i.e. with a difference of 1°C there will be one flow rate, and if it is 3°C, then the required flow rate will be less. But here the main thing is not to "go too far" in pursuit of low consumption, because the set temperature must be somehow ensured. Yes, and plus, a situation can turn out that many are probably familiar with - when you sit under a stream from a split-system air conditioner.

3. Air distribution calculation

“Air distribution in most public buildings (schools; shopping and catering establishments; recreation, tourism and treatment facilities; clubs, etc.) has not been practically studied.

The calculation mainly determines the amount and temperature of the air supplied to the room, and the dimensions, number and location of the supply and exhaust devices are accepted intuitively. This often leads to the emergence of uncomfortable zones in the premises, and, as a result, to a deterioration in the well-being of the people in them, and sometimes to turning off the ventilation.”

At the moment, there are many manufacturers of air distributors on the ventilation equipment market, and each of them has recommendations for calculating one or another type of air distributor. They also release a software package to simplify calculations.

Highlighting the point:

1. There are different types of jets (flat, conical, fan for example), each of which better solves certain problems.

2. When choosing an air diffuser, keep in mind its throw length.

3. If the temperature of the jet differs from the air temperature in the room, then it will deviate from the original direction (for example, in air heating systems, the jets “float up”).

4. In SP 60.13330.2012, in appendices B and C, there is a regulation on the permissible speed and temperature in the supply air jet at the inlet to the working / serviced area.

3.1 Calculation of the number of diffusers and grilles

The number of air distributors is determined by one of the following dependencies:

The immediate end of the air distribution calculation is a theoretical assessment of the compliance of the obtained parameters of the air velocity and temperature at the inlet to the working area with acceptable limits, see Appendixes B and C of SP 60.13330.2012.

4. Aerodynamic calculation of the network

There are a lot of CAD systems in this field, so I consider it sufficient to give a formula for finding the diameters of the duct:

2-4 m / s - on the branches to the air distributors;

4-6 m / s - on the main sections;

6-8 m/s - in the area after the fan.

5. Equipment selection

The selection of equipment is carried out according to the required air treatment scheme, the aerodynamic parameters of the network, the requirements for the energy efficiency of the system, the purity of the supplied air, acoustic characteristics, etc.

AirCut specialists carry out professional calculation of ventilation and air conditioning systems of any complexity. You can get advice on ventilation installations, order a ventilation system project, and select the necessary equipment at any of the branches of the Airkat Klimatekhnik company.

You can order calculation|consultation

• The performance of a system serving up to 4 rooms.
• Dimensions of air ducts and air distribution grilles.
• Air line resistance.
• Heater power and estimated electricity costs (when using an electric heater).

If you need to choose a model with humidification, cooling or recuperation, use the calculator on the Breezart website.

An example of calculating ventilation using a calculator

In this example, we will show how to calculate the supply ventilation for a 3-room apartment in which a family of three lives (two adults and a child). During the day, relatives sometimes come to them, so up to 5 people can stay in the living room for a long time. The ceiling height of the apartment is 2.8 meters. Room options:

We will set the consumption rates for the bedroom and the nursery in accordance with the recommendations of SNiP - 60 m³ / h per person. For the living room, we will limit ourselves to 30 m³ / h, since a large number of people in this room are infrequent. According to SNiP, such air flow is acceptable for rooms with natural ventilation (you can open a window for ventilation). If we also set an air flow rate of 60 m³/h per person for the living room, then the required performance for this room would be 300 m³/h. The cost of electricity to heat this amount of air would be very high, so we made a compromise between comfort and economy. To calculate the air exchange by the multiplicity for all rooms, we will choose a comfortable double air exchange.

The main air duct will be rectangular rigid, the branches will be flexible and soundproof (this combination of duct types is not the most common, but we chose it for demonstration purposes). For additional cleaning of the supply air, a carbon-dust fine filter of the EU5 class will be installed (we will calculate the network resistance with dirty filters). The air velocities in the air ducts and the permissible noise level on the gratings will be left equal to the recommended values ​​that are set by default.

Let's start the calculation by drawing up a diagram of the air distribution network. This scheme will allow us to determine the length of the ducts and the number of turns that can be both in the horizontal and vertical plane (we need to count all the turns at a right angle). So our schema is:

The resistance of the air distribution network is equal to the resistance of the longest section. This section can be divided into two parts: the main duct and the longest branch. If you have two branches of approximately the same length, then you need to determine which one has more resistance. To do this, we can assume that the resistance of one turn is equal to the resistance of 2.5 meters of the duct, then the branch with the maximum value (2.5 * number of turns + duct length) will have the greatest resistance. It is necessary to select two parts from the route in order to be able to set different types of air ducts and different air speeds for the main section and branches.

In our system, balancing throttle valves are installed on all branches, allowing you to adjust the air flow in each room in accordance with the project. Their resistance (in the open state) has already been taken into account, since this is a standard element of the ventilation system.

The length of the main air duct (from the air intake grille to the branch to room No. 1) is 15 meters, there are 4 right-angle turns in this section. The length of the supply unit and the air filter can be ignored (their resistance will be taken into account separately), and the silencer resistance can be taken equal to the resistance of an air duct of the same length, that is, simply consider it a part of the main air duct. The longest branch is 7 meters long and has 3 right angle bends (one at the branch, one at the duct and one at the adapter). Thus, we have set all the necessary initial data and now we can proceed to the calculations (screenshot). The calculation results are summarized in tables:

Calculation of the air duct network

• For each room (subsection 1.2), the performance is calculated, the cross-section of the duct is determined, and a suitable duct of standard diameter is selected. According to the Arktos catalog, the dimensions of distribution grids with a given noise level are determined (data for the AMN, ADN, AMR, ADR series are used). You can use other gratings with the same dimensions - in this case, there may be a slight change in the noise level and network resistance. In our case, the grilles for all rooms turned out to be the same, since at a noise level of 25 dB(A) the allowable air flow through them is 180 m³/h (there are no smaller grilles in these series).
• The sum of the air flow rates for all three rooms gives us the total system performance (subsection 1.3). When using a VAV system, the system performance will be one third lower due to the separate adjustment of the air flow in each room. Next, the section of the main air duct is calculated (in the right column - for the VAV system) and suitable rectangular air ducts are selected (usually several options are given with different aspect ratios). At the end of the section, the resistance of the air duct network is calculated, which turned out to be very large - this is due to the use of a fine filter in the ventilation system, which has a high resistance.
• We have received all the necessary data to complete the air distribution network, with the exception of the size of the main air duct between branches 1 and 3 (this parameter is not calculated in the calculator, since the network configuration is not known in advance). However, the cross-sectional area of ​​this section can be easily calculated manually: from the cross-sectional area of ​​the main duct, you need to subtract the cross-sectional area of ​​\u200b\u200bbranch No. 3. Having obtained the cross-sectional area of ​​\u200b\u200bthe duct, its size can be determined by.

Calculation of heater power and selection of air handling unit

The recommended Breezart 550 Lux model has programmable parameters (capacity and power of the heater), therefore, the performance that should be selected when setting up the remote control is indicated in brackets. It can be seen that the maximum possible power of the heater of this launcher is 11% lower than the calculated value. The lack of power will be noticeable only at outdoor temperatures below -22 ° C, and this does not happen often. In such cases, the air handling unit will automatically switch to a lower speed to maintain the set outlet temperature (Comfort function).

In the calculation results, in addition to the required performance of the ventilation system, the maximum performance of the PU at a given network resistance is indicated. If this performance turns out to be noticeably higher than the required value, you can take advantage of the possibility of programmatically limiting the maximum performance, which is available for all Breezart ventilation units. For a VAV system, the maximum performance is indicated for reference, since its performance is adjusted automatically during the operation of the system.

Calculation of the cost of operation

This section calculates the cost of electricity used to heat the air during the cold season. The costs for a VAV system depend on its configuration and mode of operation, so they are assumed to be equal to the average value: 60% of the costs of a conventional ventilation system. In our case, you can save money by reducing the air consumption at night in the living room, and during the day in the bedroom.

Ventilation in a room, especially in a residential or industrial one, must function at 100%. Of course, many may say that you can simply open a window or door to ventilate. But this option can only work in summer or spring. But what to do in winter when it's cold outside?

The need for ventilation

Firstly, it is immediately worth noting that without fresh air, a person’s lungs begin to function worse. It is also possible the appearance of a variety of diseases, which with a high percentage of probability will develop into chronic ones. Secondly, if the building is a residential building in which there are children, then the need for ventilation increases even more, since some ailments that can infect a child are likely to remain with him for life. In order to avoid such problems, it is best to deal with the arrangement of ventilation. It is worth considering several options. For example, you can do the calculation of the supply ventilation system and its installation. It is also worth adding that diseases are not all problems.

In a room or building where there is no constant exchange of air, all furniture and walls will be coated with any substance that is sprayed into the air. Suppose, if this is a kitchen, then everything that is fried, boiled, etc., will give its sediment. In addition, dust is a terrible enemy. Even cleaning products that are designed to clean will still leave their residue, which will negatively affect the residents.

Type of ventilation system

Of course, before proceeding with the design, calculation of the ventilation system or its installation, it is necessary to determine the type of network that is best suited. Currently, there are three fundamentally different types, the main difference between which is in their functioning.

The second group is the exhaust. In other words, this is an ordinary hood, which is most often installed in the kitchen areas of the building. The main task of ventilation is to extract air from the room to the outside.

Recirculation. Such a system is perhaps the most effective, since it simultaneously pumps air out of the room, and at the same time supplies fresh air from the street.

The only question that arises for everyone further is how the ventilation system works, why does the air move in one direction or another? For this, two types of air mass awakening source are used. They can be natural or mechanical, that is, artificial. To ensure their normal operation, it is necessary to carry out a correct calculation of the ventilation system.

General network calculation

As mentioned above, just choosing and installing a specific type will not be enough. It is necessary to clearly determine how much air needs to be removed from the room and how much needs to be pumped back. Experts call this air exchange, which must be calculated. Depending on the data obtained when calculating the ventilation system, it is necessary to start when choosing the type of device.

To date, a large number of different calculation methods are known. They are aimed at defining various parameters. For some systems, calculations are carried out to find out how much warm air or fumes need to be removed. Some are carried out in order to find out how much air is needed to dilute the pollution if it is an industrial building. However, the minus of all these methods is the requirement of professional knowledge and skills.

What to do if it is necessary to calculate the ventilation system, but there is no such experience? The very first thing that is recommended to do is to familiarize yourself with the various regulatory documents available for each state or even region (GOST, SNiP, etc.) These papers contain all the indications that any type of system must comply with.

Multiple calculation

One example of ventilation can be a multiplicity calculation. This method is rather complicated. However, it is quite feasible and will give good results.

The first thing to understand is what multiplicity is. A similar term describes how many times the air in a room is replaced by fresh air in 1 hour. This parameter depends on two components - this is the specificity of the structure and its area. For a visual demonstration, the calculation according to the formula for a building with a single air exchange will be shown. This indicates that a certain amount of air was removed from the room and at the same time fresh air was introduced in such an amount that corresponded to the volume of the same building.

The formula for calculation is as follows: L = n * V.

The measurement is carried out in cubic meters / hour. V is the volume of the room, and n is the multiplicity value, which is taken from the table.

If a system with several rooms is being calculated, then the volume of the entire building without walls must be taken into account in the formula. In other words, you must first calculate the volume of each room, then add up all the available results, and substitute the final value into the formula.

Ventilation with a mechanical type of device

The calculation of the mechanical ventilation system, and its installation must take place according to a specific plan.

The first stage is the determination of the numerical value of air exchange. It is necessary to determine the amount of substance that must enter the building in order to meet the requirements.

The second stage is the determination of the minimum dimensions of the air duct. It is very important to choose the correct section of the device, since such things as the purity and freshness of the incoming air depend on it.

The third stage is the choice of the type of system for installation. This is an important point.

The fourth stage is the design of the ventilation system. It is important to clearly draw up a plan-scheme according to which the installation will be carried out.

The need for mechanical ventilation arises only if the natural inflow cannot cope. Any of the networks is calculated on parameters such as its own air volume and the speed of this flow. For mechanical systems, this figure can reach 5 m 3 / h.

For example, if it is necessary to provide natural ventilation with an area of ​​​​300 m 3 / h, then it will be needed with a caliber of 350 mm. If a mechanical system is mounted, then the volume can be reduced by 1.5-2 times.

Exhaust ventilation

The calculation, like any other, must begin with the fact that performance is determined. The units of this parameter for the network are m 3 / h.

To make an effective calculation, you need to know three things: the height and area of ​​​​the rooms, the main purpose of each room, the average number of people who will be in each room at the same time.

In order to begin to calculate the ventilation and air conditioning system of this type, it is necessary to determine the multiplicity. The numerical value of this parameter is set by SNiP. Here it is important to know that the parameter for a residential, commercial or industrial premises will be different.

If the calculations are carried out for a residential building, then the multiplicity is 1. If we are talking about installing ventilation in an administrative building, then the indicator is 2-3. It depends on some other conditions. To successfully carry out the calculation, you need to know the value of the exchange by the multiplicity, as well as by the number of people. It is necessary to take the highest flow rate in order to determine the required power of the system.

To find out the air exchange rate, it is necessary to multiply the area of ​​​​the room by its height, and then by the multiplicity value (1 for household, 2-3 for others).

In order to calculate the ventilation and air conditioning system per person, you need to know the amount of air consumed by one person and multiply this value by the number of people. On average, with minimal activity, one person consumes about 20 m 3 / h, with average activity, the indicator increases to 40 m 3 / h, with intense physical exertion, the volume increases to 60 m 3 / h.

Acoustic calculation of the ventilation system

Acoustic calculation is a mandatory operation that is attached to the calculation of any room ventilation system. Such an operation is carried out in order to perform several specific tasks:

• determine the octave spectrum of airborne and structural ventilation noise at the calculated points;
• compare the existing noise with the permissible noise according to hygienic standards;
• determine how to reduce noise.

All calculations must be carried out at strictly established calculation points.

After all measures have been selected according to building and acoustic standards, which are designed to eliminate excessive noise in the room, a verification calculation of the entire system is carried out at the same points that were previously determined. However, the effective values ​​obtained during this noise reduction measure must also be added here.

To carry out calculations, certain initial data are needed. They were the noise characteristics of the equipment, which were called sound power levels (SPL). For the calculation, geometric mean frequencies in Hz are used. If an approximate calculation is carried out, then correction noise levels in dBA can be used.

If we talk about design points, then they are located in human habitats, as well as in the places where the fan is installed.

Aerodynamic calculation of the ventilation system

Such a calculation process is performed only after the air exchange for the building has already been calculated, and a decision has been made on the routing of air ducts and channels. In order to successfully carry out these calculations, it is necessary to compose a ventilation system in which it is imperative to highlight such parts as the fittings of all air ducts.

Using information and plans, it is necessary to determine the length of individual branches of the ventilation network. Here it is important to understand that the calculation of such a system can be carried out in order to solve two different problems - direct or inverse. The purpose of the calculations depends on the type of the task:

• straight line - it is necessary to determine the dimensions of the sections for all sections of the system, while setting a certain level of air flow that will pass through them;
• the reverse is to determine the air flow by setting a certain cross section for all ventilation sections.

In order to perform calculations of this type, it is necessary to break the entire system into several separate sections. The main characteristic of each selected fragment is a constant air flow.

Programs for calculation

Since it is a very time-consuming and time-consuming process to carry out calculations and build a ventilation scheme manually, simple programs have been developed that are able to do all the actions on their own. Let's consider a few. One such program for calculating the ventilation system is Vent-Clac. Why is she so good?

Such a program for calculating and designing networks is considered one of the most convenient and effective. The algorithm of this application is based on the use of the Altshul formula. The peculiarity of the program is that it copes well with both the calculation of natural ventilation and mechanical ventilation.

Since the software is constantly updated, it is worth noting that the latest version of the application is able to carry out such work as aerodynamic calculations of the resistance of the entire ventilation system. It can also effectively calculate other additional parameters that will help in the selection of preliminary equipment. In order to make these calculations, the program will need data such as the air flow at the beginning and end of the system, as well as the length of the main room duct.

Since it takes a long time to manually calculate all this and you have to break the calculations into stages, this application will provide significant support and save a lot of time.

Sanitary standards

Another option for calculating ventilation is according to sanitary standards. Similar calculations are carried out for public and administrative facilities. In order to make correct calculations, it is necessary to know the average number of people who will constantly be inside the building. If we talk about permanent consumers of air inside, then they need about 60 cubic meters per hour per one. But since temporary persons also visit public facilities, they must also be taken into account. The amount of air consumed by such a person is about 20 cubic meters per hour.

If all calculations are carried out based on the initial data from the tables, then when the final results are obtained, it will become clearly visible that the amount of air coming from the street is much greater than that consumed inside the building. In such situations, most often they resort to the simplest solution - hoods of about 195 cubic meters per hour. In most cases, adding such a network will create an acceptable balance for the existence of the entire ventilation system.

It is known that the quantitative parameters of air exchange are determined by the dominant types of harmful emissions in industrial buildings (by heat, by water vapor, harmful gases and vapors, taking into account their summation when exposed to a person).

Depending on the technological features of production processes, to ensure the parameters of the microclimate in industrial premises, the simultaneous operation of general exchange and local supply and exhaust systems is often used.

Local air ventilation systems are assembled into systems:

Technological production lines

by the simultaneous operation of the equipment,

by types of harmful emissions,

· Optimum radius of action and air consumption.

Local exhaust ventilation is a set of interconnected and interacting components such as hazardous substances released from process equipment, process equipment itself and a set of elements and devices designed to localize emitted hazards and remove polluted air outside the premises.

The main elements of local exhaust ventilation systems are:

local suction - devices designed to collect harmful substances from process equipment or places of their formation;

Branches

main air duct.

Depending on whether the system is mechanical or gravitational, it may include, if necessary, cleaning equipment (filters, dust collectors, cyclones) and a ventilation unit.

The formation of harmful substances in the air of industrial premises imposes the following requirements on the organization of air exchange:

1. The supply jets should not cross the trajectory of the local suction jet;

2. It is forbidden to install air diffusers above process equipment and process lines;

3. The air ducts of the supply systems must be located in places that do not interfere with technological production;

4. Air distributors should be located above workplaces and driveways to ensure the required weather conditions in the working area in such a way that there is a minimum trajectory from the air distributor to the human breathing zone;

5. The type of air distribution devices is determined by the type of technological operations and the features of production in the room.

The concentration of harmful substances in the air removed by local exhaust systems exceeds the concentration of these substances in the air removed by general exchange systems, so the efficiency of local exhaust systems in removing harmful substances is higher than that of general exchange systems. To achieve the same effect, general exchange systems must have significantly higher costs, so local exhaust systems are not climatic, they are technological ventilation systems.

Requirements for local suctions.

Sanitary and hygienic requirements - requirements that determine

the need for complete trapping by local suction of released harmful substances and preventing them from entering the human breathing zone in order to maintain the required climatic conditions in the working zone.

Technological requirements:

1) local suction must completely cover the place of formation of harmful substances and have a minimum technological opening (working opening) for servicing processes;

2) local suction should be located in places that ensure maximum productivity and safety of technological processes;

3) local suctions must have minimal aerodynamic resistance;

4) the removal of harmful substances must coincide with the direction of action of the forces of inertia of harmful substances;

5) local suctions must be manufactured by industrial methods and be easily dismantled.

Classification of local suctions.

There is the following conditional classification of local suctions:

semi-open

open;

completely enclosed.

Semi open local sucks- local exhausts, completely covering the place of formation of harmful substances and having a working opening for servicing technological processes (fume hoods and fume hoods).

Open local sucks- local suctions located outside the process equipment and the production line (umbrellas, canopy umbrellas, side suctions).

Fully closed local suctions- local suctions, which are part of the casing of the process equipment. For air intake, they have special slot-like holes in the casing.

When choosing a suction scheme and during its constructive study, it is necessary to be guided by the following basic provisions:

The suction should be as close as possible to the source and, if possible, isolate the source from the room;

· The best solution is complete containment of the source;

The suction opening should be oriented so that the flow of harmful emissions deviates minimally from the original direction of movement and, at the same time, the removed air does not pass through the breathing zone of the worker.

· Reducing the size of the suction inlet leads to an increase in the air flow required to trap harmful emissions.

The air flow rate for suction from a source that releases heat and gases is proportional to the characteristic air flow rate in the convective flow rising above the source:

where L 0 - typical flow rate, m3/h;

k n is a dimensionless factor that takes into account the influence of geometric

and regime parameters characterizing the "source - suction" system;

k c - coefficient taking into account the influence of the air velocity in the room;

k m is a coefficient taking into account the toxicity of harmful emissions.

For suction from shelters with working openings and leaks, the formula is also used

, (..)

where F- area of ​​working openings and leaks, m2;

v 0 - average suction speed over the area of ​​working openings and leaks, m/s.

Air speed v o depends on the nature of the technological process and the toxicity of harmful emissions and is usually determined experimentally.

When calculating suction from heat sources, it is necessary to know their convective heat transfer, which is calculated by the formulas:

horizontal surface

vertical surface

where are the temperatures of the heated surface and the air in the room, °C;

And are the areas of the horizontal and vertical surfaces of the source, .

Coefficient value n accepted depending on:

, °С……….. 50 100 200 300 400 500 1000

n………………. 1,63 1,58 1,53 1,45 1,4 1,35 1,18

When calculating suction from volumetric heat sources, the total heat transfer of all surfaces is taken

Do you dream that the house has a healthy microclimate and that no room smells musty and damp? In order for the house to be truly comfortable, even at the design stage, it is necessary to carry out a competent calculation of ventilation.

If this important point is missed during the construction of the house, in the future you will have to solve a number of problems: from removing mold in the bathroom to new repairs and installing an air duct system. Agree, it’s not very pleasant to see black mold nurseries in the kitchen on the windowsill or in the corners of the children’s room, and even plunge into repair work again.

The article presented by us contains useful materials on the calculation of ventilation systems, reference tables. Formulas, illustrative illustrations and a real example for premises for various purposes and a certain area, shown in the video, are given.

With correct calculations and proper installation, the ventilation of the house is carried out in a suitable mode. This means that the air in the premises will be fresh, with normal humidity and without unpleasant odors.

If the opposite picture is observed, for example, constant stuffiness in the bathroom or other negative phenomena, then you need to check the condition of the ventilation system.

Image Gallery

Conclusions and useful video on the topic

Roller #1. Useful information on the principles of operation of the ventilation system:

Roller #2. Together with the exhaust air, heat also leaves the home. Here, the calculations of heat losses associated with the operation of the ventilation system are clearly demonstrated:

The correct calculation of ventilation is the basis for its successful functioning and the guarantee of a favorable microclimate in a house or apartment. Knowing the basic parameters on which such calculations are based will allow not only to correctly design the ventilation system during construction, but also to correct its condition if circumstances change.