The correct calculation of the chimney hole parameters is a prerequisite for the safe and effective functioning of the heating system installed in your home. To do everything correctly, we suggest to get acquainted with the basics of the design of the smoke channel, as well as with the scheme of the device of its supernumeral part.
Note! It should be noted that the self-calculation is effective only if it is made with the requirements of the manufacturer of the heating equipment used in the house.
The choice of sizes of chimney channels of a particular type can be done in several ways:
- According to the first of them, the diameter of the supernumeral part of the chimney is calculated on the basis of the data given in the passport of the heating system. In this case, all that is required of you - is to determine its optimal height.
- For household open fireplaces, you can find out the size of the pipe using the values of its height and the area of the heating portal. In the course of the calculations, it will be necessary to use a special diagram in which the segments corresponding to the specified parameters are laid. The point of intersection of the vertical and horizontal straight lines drawn through the ends of the obtained segments, and results in the desired channel diameter, determined in accordance with the table attached to the diagram. So, with a firebox area of 0.7 m2 and a chimney height of about 12 meters according to the table, we determine that the intersection point of the lines corresponding to these parameters in the diagram is in the area of the indicator 25. This value will be the desired one.
- The value of the desired indicator for sauna stoves is determined by their specific power (per 1 kW of power should account for about 8 cm of the pipe diameter). In this case, the calculation is made according to the formula: D = P (kW)? 8, where P is the furnace power, and D is the diameter of the pipe section in centimeters.
We note, by the way, that the size of the smoke channel in bath furnaces also depends on the type of fuel used and the height of the upper part of the chimney. As an example, wood furnaces are usually given, whose power is not enough to create optimal thrust. In this case, it is recommended to use an enlarged pipe. In addition, should take into account the various nuances that you can find in the special literature.
In the event that it is necessary to determine the diameter of the channel without involving any auxiliary tools (graphs and tables) in the calculations, it will be necessary to take into account not only the height of the structure, but also the presence of a so-called "blower" in it, ensuring the flow of outside air.
You can use a relatively simple ratio, taking into account the working dimensions of the furnace and assuming that with a larger amount of combustible material, the capacity of the furnace will have an increased value.
Note! The cross section of the chimney should be selected on the basis of a ratio of 1: 1.5 to the size of the furnace. At the same time, it should not be less than the size of the blower.
Thus, using this simple proportion, you can independently calculate the cross section of the chimney pipe. When choosing a stove or fireplace design in part of its chimney channel, it is necessary to follow a simple rule: the higher it is, the better the traction characteristics of the heater. So with the increase of the chimney cross section, its traction characteristics increase in direct proportion to the size.
It is necessary to take into account that with an increase in thrust, the consumption of fuel consumed also increases. In order to save combustible material, when calculating the height of the chimney channel, it is necessary to choose some intermediate value that satisfies all the above requirements.
As for determining the dimensions of the chimney canal, mounted in multi-storey buildings, in a similar situation, most likely, you will have to seek help from specialists. This is explained by the fact that high-rise buildings have significant areas that must be fully heated (as opposed to small suburban buildings that are only partially heated). Accordingly, the heater used in the building must have an increased power sufficient to heat all its rooms.
In this case, outside assistance will be required only at the design stage of the future structure. If you have a certain experience of construction work, as well as the ability to use the relevant project documentation, it will not be difficult to make calculations yourself.