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HOW to choose a HEAT EXCHANGER?

It is possible to heat up just a half of the house with a common fireplace. Due to the heat exchanger we can raise the extent of the heating. But there are couple of disadvantages of the exchangers such as higher noisiness or dustiness. This is no doubt the greatest risk, because the particles of dust are seated in the air duct through which the hot air is led to the other rooms.

Another disadvantage is the problem with the regulation of the temperatures in each room. Next problem is that the classical fireplace do not solve the heating of the water and do not extent effectivity of the fireplace, which means they do not extent the effectivity of the heating of the house.

While decision which type of heating to choose the most effectice solution seems to be a combination of a classical fireplace with a special heat exchanger.

A good heat exchanger has to fulfill several condicitons:

-it has to reduce the tar effectively inside the exchanger

-it cannot cold down the combustion products which would cause the tar inside the chimney

Classical heat exchnagers work on a principle of cold water on one side and the flame on the other side, which cannot not ensure the mentioned conditions for effective heating. That is why the exchangers are usually critisised both by users and by experts for their problematic function in the system of heating.

There exist a solution in the form of special heat exchanger MIJORI that counts to the top of heat exchangers ever.

The main advatages of MIJORI heat exchangers are:

-very high effectivity in getting and transfering of the heat produced by burning inside the fireplace

-their deveplopment has been improved and tested while several heating seasons with great results


Their construction has been patented by Industrial Property Office of the Slovak Republic and the top parametres of the exchangers were tested and certified by Technical Exerimental Institution in Piešťany in Slovak Republic.


The effectivness of the heating

Heat losses that appear during burning are devided into three groups: 

1. Chimney loss - depends directly on the temperature of cimbustion products that go ot through the chimney. At some types of fireplace inserts the temperature is even about 500 °C. 
2. Loss arisen by not burning of gas particles - it is developed during the escape of combustible gas arising while burning wood and going out to the chimney, because it has not been burned. The loss can be both high and low according to the amount of air and the way how the air is led into the fireplace insert. For perfect burning of the wood enough amount of the air is required - at minimum 4,5m3 of air for 1 kg of the wood). It is also important to accept that there is high quantity of gas particles around the wood - over 70%. And the gas particles are flamed and burned in different temperatures and the temperature when the wood burns is very high. 
3. Loss by not burning of solid particles - is very low. After the wood is burned there is only small amount of ash - about 1% of the weight of the wood. 
To lower the loss during the burning of the wood there are two contradictory demands:

  • the demand to lower the amount of hot combustion products going out to the chimney - we can achieve it to lower the amount of the air to the fireplace insert.
  • although this way we can lower the chimney loss (1), the lack of air causes the growing amount of not burned gas particles (2).
  • the demand to burn the wood perfectly can be achieved by enough amount of air, its perfect mixture with the gas particles from wood and very high temperature inside the cimbustion chamber. Thus the gas particles are burned perfectly, but the particles going out through the chimney are very hot, which causes the chimney loss. 


EXTERNAL HEAT EXCHANGER MIJORI

the top among heat exchnagers

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