The condensing boiler is actively used in all European countries. No one doubts that this is a practical and reliable device. Europeans simply admire it - it is environmentally friendly equipment and significant energy savings. The first country to start using a condensing boiler was Holland. In the United States, the use of such devices makes it possible to obtain preferential taxation conditions. In recent years, the technology for their production has become much cheaper, which allows more and more people to pay attention to them. However, these units cost twice as much as usual, which is quite justified.
The condensing boiler works on a very simple principle. The creation of such devices became possible only after the appearance of a corrosion-resistant light alloy made of stainless steel. This is due to the fact that in the process of formation of water condensatecorrosion of iron and steel. Now we can talk about how a gas condensing boiler works. Water enters the unit, heating up there due to the combustion of gas. After that, it is sent from the boiler to the heating system, where it cools down. Further, the water is again in the boiler. When the gas burns, not only heat is formed, but also various products of this process in the form of chemical compounds. The combustion of hydrocarbon fuels produces water, carbon dioxide and nitrogen. The first component turns into steam under the influence of high temperatures. Incomplete combustion of fuel leads to the formation of carbon monoxide and soot. These hot gases give off their energy to the heat carrier, passing through the boiler heat exchanger, and water is heated. The cooled gases exit to the atmosphere through the chimney. The water vapor escapes with the smoke.
The condensing boiler is equipped with a specially designed secondary heat exchanger that allows water to condense on the surface where the temperature is less than 50 degrees Celsius. In order for the steam to settle, the heat carrier of the return line of the heating system is used. Warm gas, which was not used in the process of heating water in the main heat exchanger, ends up in the second one, where the liquid flows after cooling. The vapors condense, giving off some of the energy, which makes it possible to heat the water. The resulting condensate goes to the sewer through an additional drainage pipe.
Gas condensing wall-mounted boilers work more efficiently, the lower the temperature of the water entering the device. The optimum temperature for such devices is 30-40 degrees Celsius. In a radiator system, the temperature is usually 60-70 degrees, which leads to a decrease in the efficiency of such equipment, but it still remains quite high. Optimum operation of the condensing boiler is possible when the difference in temperature between the flow and return lines is no more than 20 degrees.
