Introduction to chimneys for fireplaces

Why do we need a chimney fireplace? And a chimney of a certain height and installation specification? Many high-rise homeowners who want to install a wood-burning fireplace should have thought about such an installation, with the chimney of the fireplace leading directly into the kitchen flue. Homeowners have not understood why a chimney fireplace is needed or the importance of a chimney for a fireplace.

Here is the content:

• The main reason

• The principle of chimney extraction.

• Chimney lateral displacement

The main reason

The main reason for installing a chimney fireplace is to produce "draw" and secondly to exhaust "waste" gases. To improve the combustion efficiency of the fireplace and low emissions (environmental protection), the fireplace is scientifically designed when the design of air into the volume and circulation path, in the absence of a chimney fireplace to produce extraction, the fireplace closed the door is unable to independently inhale oxygen to participate in the combustion.

The principle of chimney extraction

Chimney fireplace inside and outside the gas temperature difference caused by gas density differences, this density difference produces pressure differences, that is, chimney pumping force, which overcomes resistance to push the flow of flue gas. The bottom of the chimney is in a state of negative pressure is the reason why the bottom of the chimney to produces pumping force. For a highly efficient closed fireplace, a minimum of 12 Pascals of the draw is required to ensure that the fireplace can draw in enough oxygen to participate in combustion, which is the main reason why fireplaces need to install chimneys no less than 5 meters high.

According to the extraction principle, using a double-layer chimney outdoors can reduce the loss of exhaust gas temperature outdoors, allowing a greater temperature difference between the exhaust gas temperature at the chimney opening and the outdoor air temperature, generating more extraction at the same height. That is why a double-layer insulated chimney fireplace is needed outdoors.

Chimney lateral displacement

The lateral displacement of the chimney fireplace should not exceed 20% of the vertical height. We know that a chimney straight up and down is undoubtedly optimal, and in practice, installation out of the sidewall is bound to produce a lateral chimney. The lateral chimney has an obstructive effect on the internal gas flow, the longer the lateral, the greater the resistance so that at a certain height, the chimney fireplace produces less extraction. Therefore, if the vertical height of the chimney is only 5 meters, the lateral is within 1 meter, which has a limited effect on the pumping power of the chimney, and if it is more than 1 meter lateral, the vertical height needs to be increased accordingly.

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