Economizer

The operational efficiency of boiler systems that use natural gas as fuel can be improved by utilising the water content of the flue gas.

The operational efficiency of boiler systems that use natural gas as fuel can be improved by utilising the water content of the flue gas.

Newer condensing boilers have this feature built into the boiler block. Separate flue gas coolers can be mounted on older boilers to achieve the same effect. These are called economizers, and are mounted on the chimney just after the boiler block.

The system is based on the availability of return water, domestic hot water or something similar, to cool the flue gas. It is necessary that the cooling media’s temperature is lower than the dew point to ensure condensation from the flue gas in the economiser. It is also necessary that the smoke cooler is made out of corrosion-resistant materials and has a way to dispose of condensate.

Fuel savings when installing an economizer on older natural gas-fired central furnaces can reach up to 15% when compared to traditional operation.





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