Such losses are proportional to the dynamic pressure pd = ρv2/2, where ρ is the air density, equal to approximately 1.2 kg/m3 at a temperature of about +20 °C, and v is its speed [m/s], usually behind resistance. Proportionality coefficients ζ, called local resistance coefficients (KMC), for various elements systems B and HF are usually determined from tables available, in particular, in a number of other sources.
The greatest difficulty in this case is most often the search for KMS for tees or branch assemblies, since in this case it is necessary to take into account the type of tee (for passage or for branch) and the mode of air movement (discharge or suction), as well as the ratio of air flow in the branch to flow rate in the barrel Lo ʹ = Lo/Lc and cross-sectional area of the passage to the cross-sectional area of the barrel fn ʹ = fn/fc.
For tees during suction, it is also necessary to take into account the ratio of the cross-sectional area of the branch to the cross-sectional area of the trunk fo ʹ = fo/fc. In the manual, the relevant data is given in table. 22.36-22.40. However, at high relative flow rates in the branch, the RMCs change very sharply, therefore, in this area, the tables under consideration are manually interpolated with difficulty and with a significant error.
In addition, in the case of using MS Excel spreadsheets, it is again desirable to have formulas for directly calculating the CMR through the ratio of flow rates and sections. Moreover, such formulas should, on the one hand, be quite simple and convenient for mass design and use in educational process, but, at the same time, should not give an error exceeding the usual accuracy of engineering calculations.
Previously, a similar problem was solved by the author in relation to resistances encountered in water heating systems. Let us now consider this issue for mechanical systems B and HF. Below are the results of data approximation for unified tees (branch nodes) per passage. General form dependencies were chosen based on physical considerations, taking into account the ease of use of the resulting expressions while ensuring an acceptable deviation from the tabulated data:
It is easy to see that the relative area of the passage fn ʹ during discharge or, respectively, the branch fo ʹ during suction affects the CMR in the same way, namely, with an increase in fn ʹ or fo ʹ the resistance will decrease, and the numerical coefficient for the indicated parameters in all given formulas is the same the same, namely (-0.25). In addition, for both supply and exhaust tees, when the air flow rate in the branch changes, the relative minimum KMS occurs at the same level Lo ʹ = 0.2.
These circumstances indicate that the obtained expressions, despite their simplicity, sufficiently reflect the general physical laws underlying the influence of the studied parameters on pressure losses in tees of any type. In particular, the larger fn ʹ or fo ʹ, i.e. the closer they are to unity, the less the flow structure changes when passing resistance, and therefore the less the CMR.
For the value Lo ʹ the dependence is more complex, but here too it will be common to both modes of air movement. An idea of the degree of correspondence between the found relationships and the initial CMR values is given in Fig. 1, which shows the results of processing Table 22.37 for KMS standardized tees (branch assemblies) for the passage of round and rectangular cross-sections during injection. Approximately the same picture is obtained for the approximation of the table. 22.38 using formula (3).
Note that, although in the latter case we're talking about O round section, it is easy to see that expression (3) quite well describes the data in table. 22.39, already related to rectangular nodes. The error of formulas for CMS is generally 5-10% (maximum up to 15%). Slightly higher deviations may be given by expression (3) for tees during suction, but even here this can be considered satisfactory, taking into account the complexity of changing the resistance in such elements.
In any case, the nature of the dependence of the IMR on the factors influencing it is reflected very well here. In this case, the obtained relationships do not require any other initial data other than those already available in the aerodynamic calculation table. In fact, it must explicitly indicate both the air flow rates and the cross sections in the current and adjacent sections included in the listed formulas. This especially simplifies calculations when using MS Excel spreadsheets.
At the same time, the formulas given in this work are very simple, clear and easily accessible for engineering calculations, especially in MS Excel, as well as in the educational process. Their use makes it possible to abandon the interpolation of tables while maintaining the accuracy required for engineering calculations, and to directly calculate the CMC of tees per passage for a wide variety of cross-sectional ratios and air flow rates in the trunk and branches.
This is quite enough for the design of V and HF systems in most residential and public buildings.
After choosing the diameter or cross-sectional dimensions, the air speed is specified: , m/s, where f f is the actual cross-sectional area, m 2 . For round ducts 
, for square 
, for rectangular m2. In addition, for rectangular air ducts the equivalent diameter is calculated, mm. Squares have an equivalent diameter equal to side square.
You can also use the approximate formula 
. Its error does not exceed 3–5%, which is sufficient for engineering calculations. The total pressure loss due to friction for the entire section Rl, Pa, is obtained by multiplying the specific losses R by the length of the section l. If air ducts or channels made of other materials are used, it is necessary to introduce a correction for roughness β w. It depends on the absolute equivalent roughness of the air duct material K e and the value v f.
Absolute equivalent roughness of air duct material:
Correction values β w:
| V f, m/s | β w at values of K e, mm | |||
| 1.5 | ||||
| 1.32 | 1.43 | 1.77 | 2.2 | |
| 1.37 | 1.49 | 1.86 | 2.32 | |
| 1.41 | 1.54 | 1.93 | 2.41 | |
| 1.44 | 1.58 | 1.98 | 2.48 | |
| 1.47 | 1.61 | 2.03 | 2.54 |
For steel and vinyl plastic air ducts β w = 1. More detailed values of β w can be found in table 22.12. Taking into account this amendment, the updated friction pressure loss Rlβ w, Pa, is obtained by multiplying Rl by the value β w.
Then the dynamic pressure in the area, Pa, is determined. Here ρ in is the density of transported air, kg/m3. Usually they take ρ in = 1.2 kg/m 3.
The names of resistances (bend, tee, cross, elbow, grille, lampshade, umbrella, etc.) available in this area are written in the “local resistance” column. In addition, their quantity and characteristics are noted, by which the CMR values for these elements are determined. For example, for a round outlet this is the angle of rotation and the ratio of the radius of rotation to the diameter of the duct r/d, for a rectangular outlet - the angle of rotation and the dimensions of the sides of the duct a and b. For side openings in an air duct or channel (for example, at the location where the air intake grille is installed) - the ratio of the opening area to the cross-section of the air duct f hole / f o. For tees and crosses on the passage, the ratio of the cross-sectional area of the passage and the trunk f p /f s and the flow rate in the branch and in the trunk L o /L s is taken into account, for tees and crosses on the branch - the ratio of the cross-sectional area of the branch and the trunk f p /f s and again the value of L o /L s. It should be borne in mind that each tee or cross connects two adjacent sections, but they relate to the one of these sections with less air flow L. The difference between tees and crosses on a pass and on a branch has to do with how the design direction runs. This is shown in the following figure.
Here the calculated direction is depicted by a thick line, and the directions of air flows are depicted by thin arrows. In addition, it is signed where exactly in each option the trunk, passage and branch of the tee are located for the right choice relations f p /f s, f o /f s and L o /L s. Note that in supply systems the calculation is usually carried out against the movement of air, and in exhaust systems - along this movement. The areas to which the tees in question belong are indicated with check marks. The same applies to crosses. As a rule, although not always, tees and crosses on the passage appear when calculating the main direction, and on the branch they appear when aerodynamically linking secondary sections (see below). In this case, the same tee in the main direction can be taken into account as a tee for passage, and in the secondary direction - as a branch with a different coefficient.
Approximate ξ values for commonly encountered resistances are given below. Grilles and shades are taken into account only at the end sections. The coefficients for crosses are taken in the same amount as for the corresponding tees.
The values of ξ of some local resistance.
| Name of resistance | KMS (ξ) | Name of resistance | KMS (ξ) |
| Round bend 90 o, r/d = 1 | 0.21 | Fixed grille RS-G (exhaust or air intake) | 2.9 |
| Rectangular bend 90 o | 0.3 … 0.6 | ||
| Tee on passage (discharge) | 0.25 … 0.4 | Sudden expansion | |
| Tee on branch (pressure) | 0.65 … 1.9 | Sudden contraction | 0.5 |
| Tee on passage (suction) | 0.5 … 1 | First side opening (entrance to the air intake shaft) | 2.5 … 4.5 |
| Tee on branch (suction) | –0.5 * … 0.25 | ||
| Ceiling light (anemostat) ST-KR,ST-KV | 5.6 | Rectangular elbow 90 o | 1.2 |
| Adjustable grille RS-VG (supply) | 3.8 | Umbrella over the exhaust shaft | 1.3 |
*) negative CMR can occur at low L o /L s due to the ejection (suction) of air from the branch by the main flow.
More detailed data for KMS are shown in tables 22.16 - 22.43. After determining the value of Σξ, the pressure loss at local resistances, Pa, and the total pressure loss in the section Rlβ w + Z, Pa are calculated. When the calculation of all sections of the main direction is completed, the values of Rlβ w + Z for them are summed up and the total resistance of the ventilation network is determined ΔР network = Σ(Rlβ w + Z). The ΔР value of the network serves as one of the initial data for selecting a fan. After selecting a fan in the supply system, an acoustic calculation of the ventilation network is made (see Chapter 12) and, if necessary, a muffler is selected.
The calculation results are entered into a table in the following form.
After calculating the main direction, one or two branches are linked. If the system serves several floors, you can select floor branches on intermediate floors for linking. If the system serves one floor, branches from the main line that are not included in the main direction are linked (see example in paragraph 2.3). The calculation of the linked sections is carried out in the same sequence as for the main direction, and is recorded in the table in the same form. The linkage is considered completed if the sum of pressure losses Σ(Rlβ w + Z) along the tied sections deviates from the sum Σ(Rlβ w + Z) along the parallel connected sections of the main direction by no more than ±10%. Parallel connected sections are considered to be sections along the main and linked directions from the point of their branching to the end air distributors. If the diagram looks as shown in the following figure (the main direction is highlighted with a thick line), then linking direction 2 requires that the value of Rlβ w + Z for section 2 be equal to Rlβ w + Z for section 1, obtained from the calculation of the main direction, with an accuracy ±10%.
The programs can be useful to designers, managers, and engineers. Basically, to use the programs it is enough Microsoft Excel. Many program authors are unknown. I would like to acknowledge the work of these people, who were able to prepare such useful calculation programs using Excel. Calculation programs for ventilation and air conditioning are free to download. But, don't forget! You cannot absolutely trust the program; check its data.
Sincerely, site administration
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It is especially useful for engineers and designers in the field of designing engineering structures and sanitary systems. Developer Vlad Volkov |
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An updated calculator was sent by user ok, for which Ventportal thanks him! |
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Program for calculating thermodynamic parameters humid air or a mixture of two streams. Convenient and intuitive interface; the program does not require installation. |
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The program converts values from one measurement scale to another. The "Transformer" knows the most commonly used, less common and outdated measures. In total, the program database contains information about 800 measures, many of which have brief information. There are possibilities to search the database, sort and filter records. |
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The Vent-Calc program was created for the calculation and design of ventilation systems. The program is based on the methodology hydraulic calculation air ducts according to the Altschul formulas given in |
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A program for converting various units of measurement. Program language - Russian/English. |
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The program algorithm is based on the use of an approximate analytical method for calculating changes in air condition. The calculation error is no more than 3% |
You can also use the approximate formula:
0.195 v 1.8
R f . (10) d 100 1 , 2
Its error does not exceed 3–5%, which is sufficient for engineering calculations.
The total pressure loss due to friction for the entire section is obtained by multiplying the specific losses R by the length of the section l, Rl, Pa. If air ducts or channels made of other materials are used, it is necessary to introduce a correction for roughness βsh according to table. 2. It depends on the absolute equivalent roughness of the air duct material K e (Table 3) and the value v f .
table 2 |
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Correction values βsh |
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v f , m/s |
βsh at values of K e, mm |
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Table 3 Absolute equivalent roughness of air duct material
Plasterer- |
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on the grid |
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K e, mm |
For steel air ducts βsh = 1. More detailed values of βsh can be found in table. 22.12. Taking into account this amendment, the updated friction pressure loss Rl βsh, Pa, is obtained by multiplying Rl by the value βsh. Then the dynamic pressure on the participants is determined
under standard conditions ρw = 1.2 kg/m3.
Next, local resistances are identified in the area, local resistance coefficients (LRC) ξ are determined, and the sum of the IMR in this area (Σξ) is calculated. All local resistances are recorded in the following form.
SHEET KMS VENTILATION SYSTEMS
Etc.
IN the “local resistance” column records the names of the resistances (bend, tee, cross, elbow, grille, air distributor, umbrella, etc.) available in this area. In addition, their quantity and characteristics are noted, by which the CMR values are determined for these elements. For example, for a round outlet this is the angle of rotation and the ratio of the radius of rotation to the diameter of the duct r /d, for a rectangular outlet - the angle of rotation and dimensions of the sides of the air duct a and b. For side openings in an air duct or channel (for example, at the location where an air intake grille is installed) - the ratio of the area of the opening to the cross-section of the air duct
f otv / f o . For tees and crosses on the passage, the ratio of the cross-sectional area of the passage and the trunk f p /f s and the flow rate in the branch and in the trunk L o /L s is taken into account, for tees and crosses on the branch - the ratio of the cross-sectional area of the branch and the trunk f p /f s and again the value of L o / L c . It should be borne in mind that each tee or cross connects two adjacent sections, but they relate to the one of these sections with less air flow L. The difference between tees and crosses on a pass and on a branch has to do with how the design direction runs. This is shown in Fig. 11. Here the calculated direction is depicted by a thick line, and the directions of air flows are depicted by thin arrows. In addition, it is signed where exactly in each option the barrel, passage and opening are located.
tee branching for the correct choice of ratios fп/fс, fo/fс and Lо/Lс. Note that in supply ventilation systems the calculation is usually carried out against the air movement, and in exhaust ventilation systems - along this movement. The areas to which the tees in question belong are indicated with check marks. The same applies to crosses. As a rule, although not always, tees and crosses on the passage appear when calculating the main direction, and on the branch they appear when aerodynamically linking secondary sections (see below). In this case, the same tee in the main direction can be taken into account as a tee for passage, and in the secondary direction
– as a branch with a different coefficient. KMS for crosses
accepted in the same size as for the corresponding tees.
Rice. 11. Tee calculation diagram
Approximate values of ξ for commonly encountered resistances are given in Table. 4.
Table 4 |
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Values ξ of some local resistances |
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Name |
Name |
|||
resistance |
resistance |
|||
Round bend 90o, |
The grille is not adjustable |
|||
r/d = 1 |
May RS-G (exhaust or |
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Rectangular bend 90° |
air intake) |
|||
Tee on the passage (on- |
Sudden expansion |
|||
oppression) |
||||
Tee on branch |
Sudden contraction |
|||
Tee on the passage (all- |
The first side hole |
|||
sity (entrance into air intake |
||||
Tee on branch |
–0.5* … |
boron mine) |
||
Lamp lamp (anemostat) ST-KR, |
Rectangular elbow |
|||
90o |
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Adjustable grille RS- |
Umbrella over the exhaust |
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VG (supply) |
||||
*) negative CMR can occur at low Lo/Lс due to the ejection (suction) of air from the branch by the main flow.
More detailed data for KMS are shown in table. 22.16 – 22.43. For the most common local resistances -
tees in the passage - KMS can also be approximately calculated using the following formulas:
0.41 f "25 L" 0.2 4 |
0.25 at |
0.7 and |
f "0.5 (11) |
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– for tees during discharge (supply); |
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at L" |
0.4 you can use a simplified formula |
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prox pr 0. 425 0. 25 f p "; |
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0.2 1.7 f" |
0.35 0.25f" |
2.4L" |
0. 2 2 |
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– for suction (exhaust) tees.
Here L" |
f o |
and f" |
f p |
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f with |
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After determining the value of Σξ, calculate the pressure loss at local resistances Z P d , Pa, and the total pressure loss
leniya in the area Rl βш + Z, Pa.
The calculation results are entered into a table in the following form.
AERODYNAMIC CALCULATION OF THE VENTILATION SYSTEM
Calculated |
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Duct dimensions |
pressure |
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for friction |
Rlβ w |
Rd, |
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βsh |
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d or |
f op, |
ff, |
Vf, |
d eq |
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l, m |
a×b, |
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When the calculation of all sections of the main direction is completed, the values of Rl βш + Z for them are summed up and the total resistance is determined.
ventilation network P network = Σ(Rl βш + Z ).
After calculating the main direction, one or two branches are linked. If the system serves several floors, you can select floor branches on intermediate floors for linking. If the system serves one floor, branches from the main line that are not included in the main direction are linked (see example in paragraph 4.3). The calculation of the linked sections is carried out in the same sequence as for the main direction, and is recorded in the table in the same form. The linking is considered completed if the amount
pressure loss Σ(Rl βш + Z) along the linked sections deviates from the sum Σ(Rl βш + Z) along the parallel connected sections of the main direction by no more than 10%. Parallel connected sections are considered to be sections along the main and linked directions from the point of their branching to the end air distributors. If the circuit looks like shown in Fig. 12 (the main direction is highlighted with a thick line), then linking direction 2 requires that the value of Rl βш + Z for section 2 be equal to Rl βш + Z for section 1, obtained from the calculation of the main direction, with an accuracy of 10%. Linking is achieved by selecting the diameters of round or section sizes of rectangular air ducts in the linked areas, and if this is not possible, by installing throttle valves or diaphragms on the branches.
Fan selection should be made according to the manufacturer’s catalogs or data. The fan pressure is equal to the sum of pressure losses in the ventilation network in the main direction, determined during the aerodynamic calculation of the ventilation system, and the sum of pressure losses in the elements of the ventilation unit ( air valve, filter, air heater, silencer, etc.).
Rice. 12. Fragment of the ventilation system diagram with the choice of branch for linking
It is possible to finally select a fan only after an acoustic calculation, when the issue of installing a noise suppressor has been decided. An acoustic calculation can only be performed after preliminary selection of a fan, since the initial data for it are the levels of sound power emitted by the fan into the air ducts. Acoustic calculations are performed following the instructions in Chapter 12. If necessary, calculate and determine the standard size of the silencer, then finally select the fan.
4.3. An example of calculating a supply ventilation system
Under consideration supply system ventilation for the dining room. The drawing of air ducts and air distributors on the plan is given in paragraph 3.1 in the first version ( typical diagram for halls).
System diagram
1000x400 5 8310 m3/h
2772 m3/h2 |
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More details about the calculation methodology and the necessary initial data can be found at. The corresponding terminology is given in.
SHEET KMS SYSTEM P1
Local resistance |
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924 m3/h |
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1. Round bend 90o r /d =1 |
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2. Tee on the passage (discharge) |
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fп/fc |
Lo/Lc |
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fп/fc |
Lo/Lc |
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1. Tee on the passage (discharge) |
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fп/fc |
Lo/Lc |
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1. Tee on the passage (discharge) |
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fп/fc |
Lo/Lc |
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1. Rectangular bend 1000×400 90o 4 pcs. |
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1. Air intake shaft with umbrella |
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(first side hole) |
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1. Louvered air intake grille |
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SHEET OF KMS SYSTEM P1 (BRANCH No. 1) |
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Local resistance |
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1. Air distributor PRM3 at flow rate |
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924 m3/h |
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1. Round bend 90o r /d =1 |
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2. Branch tee (discharge) |
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fo/fc |
Lo/Lc |
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APPENDIX Characteristics ventilation grilles and lampshades
I. Clear cross-sections, m2, of supply and exhaust louver grilles RS-VG and RS-G
Length, mm |
Height, mm |
|||||
Speed coefficient m = 6.3, temperature coefficient n = 5.1.
II. Characteristics of lampshades ST-KR and ST-KV
Name |
Dimensions, mm |
f fact, m 2 |
||
Dimensional |
Interior |
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Lamp ST-KR |
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(round) |
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Lamp ST-KV |
||||
(square) |
||||
Speed coefficient m = 2.5, temperature coefficient n = 3.
BIBLIOGRAPHICAL LIST
1. Samarin O.D. Selection of air supply equipment ventilation units(air conditioners) type KTsKP. Guidelines for completing coursework and diploma projects for students of specialty 270109 “Heat and gas supply and ventilation.” – M.: MGSU, 2009. – 32 p.
2. Belova E.M. Central systems air conditioning in buildings. – M.: Euroclimate, 2006. – 640 p.
3. SNiP 41-01-2003 “Heating, ventilation and air conditioning”. – M.: State Unitary Enterprise TsPP, 2004.
4. Catalog of Arktos equipment.
5. sanitary facilities. Part 3. Ventilation and air conditioning. Book 2. / Ed. N.N. Pavlov and Yu.I. Schiller. – M.: Stroyizdat, 1992. – 416 p.
6. GOST 21.602-2003. System project documentation for construction. Execution Rules working documentation heating, ventilation and air conditioning. – M.: State Unitary Enterprise TsPP, 2004.
7. Samarin O.D. About the mode of air movement in steel air ducts.
// SOK, 2006, No. 7, p. 90 – 91.
8. Designer's Handbook. Domestic sanitary facilities. Part 3. Ventilation and air conditioning. Book 1. / Ed. N.N. Pavlov and Yu.I. Schiller. – M.: Stroyizdat, 1992. – 320 p.
9. Kamenev P.N., Tertichnik E.I. Ventilation. – M.: ASV, 2006. – 616 p.
10. Krupnov B.A. Terminology for building thermal physics, heating, ventilation and air conditioning: guidelines for students of the specialty "Heat and Gas Supply and Ventilation".
- Requirements and conditions for their fulfillment for conferring the sports title of Grandmaster of Russia.
Sports disciplines - Chess, chess - team competitions, blitz, rapid chess:
- Norms and conditions for their implementation for conferring the sports title of Master of Sports of Russia.
- Norms and conditions for their implementation for the assignment of sports categories.
Sports discipline - Chess composition:
- Requirements and conditions for their fulfillment for conferring the sports title Master of Sports of Russia, sports category Candidate Master of Sports, I-III sports categories.
Sports discipline - Correspondence chess:
- Norms and conditions for their implementation for conferring the sports title of Master of Sports of Russia, sports categories.
4. Norms and conditions for their implementation for the assignment of sports categories.
Sports discipline - Chess, chess - team competitions, blitz, rapid chess
CMS is performed from 9 years of age
| KMS | ||
| M | AND | |
| 1901-1925 | 1801-1825 | 75 |
| 1926-1950 | 1826-1850 | 70 |
| 1951-1975 | 1851-1875 | 65 |
| 1976-2000 | 1876-1900 | 60 |
| 2001-2025 | 1901-1925 | 55 |
| 2026-2050 | 1926-1950 | 50 |
| 2051-2075 | 1951-1975 | 45 |
| 2076-2100 | 1976-2000 | 40 |
| > 2100 | > 2000 | 35 |
| Sports categories | |||||
| I | II | III | |||
| Condition for fulfilling the norm: average Russian rating of opponents | Norm: % of points scored to the number of maximum possible points in actually played games | Condition for fulfilling the norm: average Russian rating of opponents | Norm: % of points scored to the number of maximum possible points in actually played games | Condition for fulfilling the norm: average Russian rating of opponents | Norm: % of points scored to the number of maximum possible points in actually played games |
| 1701-1725 | 75 | 1501-1525 | 75 | 1301-1325 | 75 |
| 1726-1750 | 70 | 1526-1550 | 70 | 1326-1350 | 70 |
| 1751-1775 | 65 | 1551-1575 | 65 | 1351-1375 | 65 |
| 1776-1800 | 60 | 1576-1600 | 60 | 1376-1400 | 60 |
| 1801-1825 | 55 | 1601-1625 | 55 | 1401-1425 | 55 |
| 1826-1850 | 50 | 1626-1650 | 50 | 1426-1450 | 50 |
| 1851-1875 | 45 | 1651-1675 | 45 | 1451-1475 | 45 |
| 1876-1900 | 40 | 1676-1700 | 40 | 1476-1500 | 40 |
| > 1900 | 35 | > 1700 | 35 | > 1500 | 35 |
| Sports categories (women's) | |||||
| I | II | III | |||
| Condition for fulfilling the norm: average Russian rating of opponents | Norm: % of points scored to the number of maximum possible points in actually played games | Condition for fulfilling the norm: average Russian rating of opponents | Norm: % of points scored to the number of maximum possible points in actually played games | Condition for fulfilling the norm: average Russian rating of opponents | Norm: % of points scored to the number of maximum possible points in actually played games |
| 1601-1625 | 75 | 1401-1425 | 75 | 1201-1225 | 75 |
| 1626-1650 | 70 | 1426-1450 | 70 | 1226-1250 | 70 |
| 1651-1675 | 65 | 1451-1475 | 65 | 1251-1275 | 65 |
| 1676-1700 | 60 | 1476-1500 | 60 | 1276-1300 | 60 |
| 1701-1725 | 55 | 1501-1525 | 55 | 1301-1325 | 55 |
| 1726-1750 | 50 | 1526-1550 | 50 | 1326-1350 | 50 |
| 1751-1775 | 45 | 1551-1575 | 45 | 1351-1375 | 45 |
| 1776-1800 | 40 | 1576-1600 | 40 | 1376-1400 | 40 |
| > 1800 | 35 | > 1600 | 35 | > 1400 | 35 |
| Youth sports categories | |||||
| I | II | III | |||
| Condition for fulfilling the norm: average Russian rating of opponents | Norm: % of points scored to the number of maximum possible points in actually played games | Condition for fulfilling the norm: average Russian rating of opponents | Norm: % of points scored to the number of maximum possible points in actually played games | Condition for fulfilling the norm: average Russian rating of opponents | Norm: % of points scored to the number of maximum possible points in actually played games |
| 1151-1156 | 75 | 1101-1106 | 75 | ||
| 1157-1162 | 70 | 1107-1112 | 70 | ||
| 1163-1168 | 65 | 1113-1118 | 65 | ||
| 1169-1174 | 60 | 1119-1124 | 60 | 1000 | 60 |
| 1175-1180 | 55 | 1125-1130 | 55 | 1001-1025 | 55 |
| 1181-1185 | 50 | 1131-1135 | 50 | 1026-1050 | 50 |
| 1186-1190 | 45 | 1136-1140 | 45 | 1051-1075 | 45 |
| 1191-1200 | 40 | 1141-1150 | 40 | 1076-1100 | 40 |
| >1200 | 35 | >1150 | 35 | >1100 | 35 |
Other conditions
3. To fulfill the norm of sports categories in a sports competition or physical education event, the athlete must actually play >= 7 games in the sports disciplines “chess” or “chess - team competitions”.
4. To fulfill the norm of sports categories in a sports competition, physical education event, the athlete must actually play >= 9 games in the sports discipline “quick chess”.
5. To fulfill the norm of sports categories in a sports competition or physical education event, the athlete must actually play >= 11 games in the sports discipline “blitz”.
6. In the sports discipline "rapid chess" time control is applied: 15 minutes until the end of the game with an addition of 10 seconds for each move made, starting from the 1st, for each athlete or 10 minutes until the end of the game with an addition of 5 seconds for each move made, starting from the 1st, for each athlete.
7. In the sports discipline “blitz”, time control is applied: 3 minutes before the end of the game with the addition of 2 seconds for each move made, starting from the 1st, for each athlete.
8. Russian championships, all-Russian sports competitions included in the ECP, among persons with an upper age limit, championships of the federal district, two or more federal districts, championships of Moscow, St. Petersburg, championships of the subject Russian Federation, other official sports competitions of a constituent entity of the Russian Federation among persons with an upper age limit, other physical education events of a constituent entity of the Russian Federation among persons with an upper age limit, municipal championships, intermunicipal official sports competitions among persons with an upper age limit, physical education events of a municipal entity among persons with an upper age limit, other official sports competitions of the municipality among persons with an upper age limit, other physical education events among persons with an upper age limit are held in the following age groups: juniors, juniors (up to 21 years); boys, girls (under 19 years old); boys, girls (up to 17 years old); boys, girls (up to 15 years); boys, girls (up to 13 years old); boys, girls (up to 11 years old); boys, girls (up to 9 years old).
9. World Universiade, World Championship among students, All-Russian Universiade, All-Russian sports competitions among students, included in the EKP, are held in the age group: juniors, junior women (17-25 years old).
10. To determine the average Russian rating of opponents in a sports competition or physical education event, it is necessary to summarize the Russian ratings of the athlete’s opponents in a sports competition or physical education event. The amount thus obtained is divided by the number of the athlete’s opponents in a sports competition or physical education event.
11. In a sports competition or physical education event, participants who do not have a Russian rating are counted as having a Russian rating of 1000.
12. Definition of norm:
12.1. In the column “Condition for fulfilling the norm: average Russian rating of opponents” we find a line with a number corresponding to the average Russian rating opponents of a held sports competition, physical education event, respectively, among men or women, the number located at the intersection of the specified line and the column “Norm: % of points scored to the number of maximum possible points in the games actually played” corresponds to the percentage of points scored from the maximum number of points that it was possible to score in the actual games played in a sports competition or physical education event.
12.2. Norm: % of points scored to the number of maximum possible points in actually played games, expressed in the number of points, calculated by the formula: A = (BxC)/100, where:
A - number of points,
B - the number specified in clause 12.1 of these other conditions corresponds to the percentage of points scored from the maximum number of points that could be scored in the games actually played,
C is the number of maximum possible points in the actual games played in the sporting competition.
12.3. If the norm of a sports category in a sports competition or physical education event is expressed fractional number, then it is rounded to the nearest half point.
13. Sports categories are assigned in the sports disciplines “chess”, “chess - team competitions”, “rapid chess” and “blitz” based on the results of official sports competitions, physical education events: CMS - not lower than the status of an official sports competition, physical education event of a municipality; I-III sports categories and I-III youth sports categories - at official sports competitions, physical education events of any status.
14. CMS in the sports disciplines “chess” and “chess - team competitions” is awarded for first place taken in official sports competitions with a status not lower than the championship of federal districts, two or more federal districts, the championship of Moscow, St. Petersburg in the following age groups: juniors, juniors (under 21 years old); boys, girls (under 19 years old); boys, girls (up to 17 years old); boys, girls (under 15 years old).
15. In the sports disciplines “rapid chess” and “blitz” in age categories: boys, girls (up to 13 years); boys, girls (up to 11 years old); boys, girls (under 9 years old) sports categories are not assigned.
16. I-III youth sports categories in the sports disciplines “chess” and “chess - team competitions” are assigned up to 15 years of age.
17. To participate in sports competitions, an athlete must reach the established age in the calendar year of the sports competition.
