The condensing boilers have been developed to exploit
the latent heat of vaporization during the condensation of the generated water
vapor in the exhaust gas (which is derived from hydrogen of the fuel, the
humidity of the fuel and the humidity of the combustion air). Gaseous
fuels have the advantage of increased hydrogen content, while they do not
contain sulfur.
In
a condensing boiler we can utilize about 50% to 80% of the latent heat of vaporization
of the water vapor achieving a high degree of efficiency up to about 108% (with
reference to the lower calorific value of the fuel).
How
Condensing Boilers work
The
basic principle of operation of their condensing boilers is that the exhaust gases
are not led directly to the flue but pass through a heat exchanger. In the
heat exchanger, the hot exhaust gases exchange energy with the water returning
from the bodies and cool before being led to the flue. Exhaust
liquefaction is collected in a usually stainless steel collection basin and led
to the drain without corroding the boiler κ λεβητες
πετρελαιου.
.
It has been established to calculate the rated efficiency of a
boiler based on the Lower Thermogenic Power, and the extra energy that could be
extracted from the cooling and condensing of the boiler exhaust is not
calculated at all. A gas boiler, with a nominal efficiency of 90%, when
consuming 1m³ of fuel, produces (8.130 * 0.9) = 7.317Kcal λεβητες πετρελαιου συμπυκνωσης.
The
most modern boiler with condensing technology and controlled oxygen supply
through the electronically changing fan speeds, has a corresponding degree of
efficiency up to 95%, so with the same 1m³ of natural gas produces (8.130 *
0.95) = 7.723Kcal + 1.032Kcal (from cooling and condensation of its exhaust
gases) = 8.755Kcal.
Thus, a "conventional" degree of return is obtained: 8.755 / 8.130 =
1.08 or 108%
Why finally choose a boiler with condensing
technology?
The
advantages are:
- Less consumption for the
same result,
- Higher efficiency,
- Smaller losses.
As
mentioned above, the condensing boiler has a higher degree of efficiency than
the conventional boiler, because it also exploits the heat of the exhaust gas,
part of which is recovered through a specially designed exchanger, in which the
cooling and condensing of the exhaust gas takes place.
In addition, the electronically controlled and variable speed fan of the condensing
boiler, always guarantees perfect combustion and a high degree of efficiency
throughout the power range of the boiler.
Finally, the general losses from the chimney and the walls of the condensing
boiler are much smaller than those of a conventional boiler, due to the lower
temperature (45-50 ° C) where its exhaust gases are located λεβητας πετρελαιου.
Thus, the condensing boiler achieves a significant reduction in fuel
consumption compared to a conventional boiler, in any type of installation:
- Up to 15% in traditional
systems with radiators (high
temperatures 70 ~ 80 ° C).
- Up to 20% in mixed systems .
- Up to 35% in underfloor
heating systems (low
temperatures 40 ~ 50 ° C).
Finally,
in addition to the key issue of consumption economy, one of the most important
advantages of condensing boilers is that they are very close to the theoretical
model of "perfect" combustion, which means that "dangerous"
pollutants such as CO (carbon monoxide) are minimized. ), or NOx (nitrogen
oxides), which from an ecological point of view makes them ideal - if not
mandatory - for densely populated cities.
What does the Legislation say about
Condensing Boilers?
According
to the European Directive ECODESIGN (ERP) from September 2017 in the countries
of the European Union the movement and installation in new boilers, burners and
boilers that do not have full condensing technology is prohibited λεβητας πετρελαιου συμπυκνωσης.
ANDRIANOS
trades wholesale and installs in most areas of Greece, LPG and natural gas
condensing boilers of the leading Italian company ARISTON.