TECHNOLOGY OF CONCENTRATION
Condensation technology is a proven cost-effective method of saving energy in gas / liquefied petroleum / petroleum gas fired boilers after fully exploiting the useful energy from combustion. As with low temperature boilers, the boiler begins to produce hot water of such a temperature as to meet the current heating requirement (outdoor temperature base) to achieve maximum energy savings.
While in low temperature boilers, condensation of exhaust gases and thus the wetting of heating surfaces must be avoided, condensation technology works by opposing rules: here the exhaust gas condensation is really highly desirable and required to convert latent energy contained in the vapor, along with the actual heat emitted from the exhaust gases, in useful heat.
Also, with the condensing technology, the heat you lose in the chimney decreases considerably, since the temperature of the exhaust gases released into the atmosphere is too low.
The condensate is formed by the vapors contained in the flue gas from combustion of oil or gas if the boiler wall temperature in the combustion chamber on the exhaust side is below the humidification point. The liquefaction point is different when the fuel is a gas and different when the fuel is oil because of the different chemical composition of the two fuels. Usually in boilers using gas as a fuel, the liquefaction point is about 57 ° C, while when the fuel is oil the condensation point is about 47 ° C. The theoretical energy gain when fuel is a gas in condensing boilers compared to low temperature boilers is 11%, while when the fuel is oil, the maximum gain through the use of condensing technology is 6%.
The advantages to the final consumer with condensing technology are particularly evident in low-temperature systems such as floor heating. Boilers operating at a constant high temperature have a significantly increased consumption due to the fact that, although the required heating temperature requires low temperatures, the boiler continues and operates at high temperature, consuming more fuel. In boilers with condensing technology, the boiler produces low-temperature water as long as you need to heat the rooms, achieving continuous condensation throughout its operation and thus maximizing energy savings. It is equally important to minimize the energy losses you get both from the boiler itself and the chimney.
Condensation technology can be used not only in low temperature heating systems but also in high temperature heating systems (75 / 60ºC), since in these systems the actual water return temperature of the boiler is below the liquefaction point to 90% of the total boiler operation and thus we achieve a significant degree of condensation and thus savings.
Choosing the right materials for the construction of condensing boilers plays a major role in avoiding damage to the boiler due to corrosion. Because when the exhaust gas is condensed the carbon dioxide CO2 generated during the combustion, in combination with the nitrogen N2 contained in the gas reacts to nitric acid while when the fuel is oil due to the sulfur (S) containing sulfate all heat exchange surfaces of the boilers in contact with the condensate must be made from materials that remain intact by the chemical attack of the condensation components. Stainless steel has proven to be the ideal material.