Maximum efficiency through LOOS flue gas heat exchanger
One of the important key values in assessing the efficiency of a boiler system is the figure for flue gas losses. This percentage figure shows the quantity of energy contained in the flue gases which are blown out unused through the chimney. Because of the laws of physics, the flue gas temperatures of high-pressure steam boilers or high-pressure hot water boilers are relatively high. The water temperature of a high-pressure boiler with an average working pressure of 10 bar, for example, is around 180 °C. The flue gases taken through the boiler can thus never be cooled to lower temperatures, however modern the boiler may be. This represents a massive loss of energy, which can be avoided by the use of convection passes known as flue gas heat exchangers.
Legislators in Germany recognised the need for action back in 1998. Since then, the German law on the prevention of emissions (BImSchV) has set out clear limit values. The flue gas losses from oil and gas fired systems with higher outputs (over 50 kW) may not exceed 9%. For the systems already in existence when the limits were laid down, transitional periods were defined, during which systems had to be modified to the newly defined values. The last transitional period ends on 1 November 2004, which means that at this point, all old systems must also reach the values given above.
However, all boiler operators should already, for economic reasons, be concentrating on fitting their boiler systems with a flue gas heat exchanger as soon as possible. Flame-tube smoke-tube boilers of all sizes can generally be easily retrofitted with flue gas heat exchangers. The efficiency of a boiler system can be increased by up to 7 % in dry operation and up to 15 % in condensation operation.
An investment that's worthwhile for operators:
Legislators in Germany recognised the need for action back in 1998. Since then, the German law on the prevention of emissions (BImSchV) has set out clear limit values. The flue gas losses from oil and gas fired systems with higher outputs (over 50 kW) may not exceed 9%. For the systems already in existence when the limits were laid down, transitional periods were defined, during which systems had to be modified to the newly defined values. The last transitional period ends on 1 November 2004, which means that at this point, all old systems must also reach the values given above.
However, all boiler operators should already, for economic reasons, be concentrating on fitting their boiler systems with a flue gas heat exchanger as soon as possible. Flame-tube smoke-tube boilers of all sizes can generally be easily retrofitted with flue gas heat exchangers. The efficiency of a boiler system can be increased by up to 7 % in dry operation and up to 15 % in condensation operation.
An investment that's worthwhile for operators:
- investment costs are recovered after just 1-2 years
- lower fuel requirement means lower costs
- reduction in environmental pollution because flue gas emissions are cut
- more careful operation increases the working life of the boiler
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