Chimney diameter for wood stove table

It is also important to choose the correct height and diameter of the chimney pipe. Incorrect calculation of at least one parameter will affect thrust and efficiency. Mistakes that can be made during the design and construction of a chimney in a residential building or bathhouse often lead to more serious consequences: a fire, the need for financial expenses for alterations, etc. That is why it is so important to comply with regulatory requirements when constructing a chimney.

How to calculate the chimney diameter

When designing a chimney, you need to choose the material to use. And the material largely depends on what fuel will be used for heating. After all, the chimney is designed to remove combustion residues of one fuel, and will not work with another. For example, a brick chimney works well with firewood, but is not suitable for heating appliances using gas fuel.

In addition, a correct calculation of the diameter of the household pipe is necessary. If the chimney is used for one heating device, the problem can be solved by reviewing the technical documents provided by the factory that manufactured the device. And if several different systems are connected to one pipe, then to calculate the chimney, you need knowledge of the laws of thermodynamics, professional calculation, especially the diameter of the pipe. It is wrong to think that a larger diameter is needed.

Swedish method

Among the different methods for calculating the diameter, the optimally suitable scheme is important, especially if the devices are low-temperature and long-burning.

To determine the height, the ratio of the cross-sectional area of ​​the chimney pipe to the internal combustion chamber is taken into account. The height of the pipe is determined according to the schedule:

Where f is the area of ​​the chimney cut, and F is the area of ​​the firebox.

Let, for example, the cross-sectional area of ​​the firebox F be 70*45=3150 sq. cm, and the cross-section of the chimney pipe f is 26*15=390. The ratio between the given parameters is (390/3150)*100%=12.3%. Having checked the result obtained with the graph, we see that the height of the chimney is approximately 5 m.

Important! This calculation method is more suitable for fireplace appliances, because it does not take into account the volume of air inside the firebox.

Important! When installing a chimney for complex heating systems, it is important to calculate the parameters of the chimney.

Exact calculation

To calculate the required cross-section of the chimney, be sure to take into account all its characteristics. For example, you can perform a standard calculation of the size of a chimney connected to a wood-burning stove. Take the following data for calculations:

• the temperature of combustion waste in the pipe is t=150°C;
• the speed of passage of waste through the pipeline is 2 m/s;
• The combustion rate of wood B is 10 kg/h.

If you follow these indicators, you can start doing calculations. For this purpose, calculate the amount of combustion products released using the formula:

Here V is equal to the amount of air required to burn the fuel at a speed v=10 kg/hour. It is equal to 10 m³/kg.

It turns out:

Then calculate the required diameter:

Chimney diameter table

Diameter tables compiled for various chimneys are now relevant, since many people prefer to install ready-made pipe elements from various materials. To easily understand these various materials and learn to choose the right parameters, documents have been developed with regulatory data entered into special tables. The relevant parameters are listed here. To calculate the required dimensions, you can use these tables.

Attention! It should be remembered that the cross-section of the smoke exhaust pipe must be greater than or equal to the cross-section of the internal channel of the heating device.

The exact tables of the calculated diameters of the smoke exhaust pipe for its correct operation are calculated in accordance with the technical parameters of all elements, according to the recommendations of experts, the materials of the smoke exhaust pipe, or using diameter - power tables.