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Condensing Economizers 
WHAT IS THE DIFFERNECE BETWEEN A REGULAR ECONOMIZER AND CONDENSING ECONOMIZER?
In application the two are one-in-the-same, since they both recovery heat from an exhaust stream and return it to a colder water stream. The difference is the temperature range in which the economizer is operated. Our unit may look identical in outward appearance, but can be used in a condensing application if originally design to do so. A large savings increase occurs when the flue gas temperature is decreased to under 135F, but this is only effective when burning natural gas or other clean fuels. |
• A traditional economizer is operated in a hot environment, the tubes and the flue gases are over 200F,
recovering only sensible heat from the flue gasses. In this application there is relatively little corrosion
potential on the inside or outside of the tube.
• A condensing economizer operates in a cooler environment, where the tubes and flue gasses may be well
under 200F, and it is possible to recovery both sensible and latent heat from the flue gasses. In this
application there is significant corrosion potential on the inside AND outside of the tube, and high alloy
materials are required for a long service life.
When the flue gas temperature is lowered into the condensing range (135F for natural gas combustion), a portion of the water in the flue gas (normally 10-15% of the exhaust mass) is condensed back into a liquid.
The heat that comes from the condensation adds significantly to the total recovery and translates directly to higher dollar savings $$$.
In construction and materials these units are different. Traditional economizers are built mainly from carbon steel, with few stainless steel items. Condensing economizers are built from stainless steel since they are expected to be wet on the tube exterior the majority of the service time.
Many times the water flowing through the condensing economizer is not used in the boiler system. Therefore we have to ask more questions about desired inlet / outlet water temperatures and flow rates, to make sure our unit provides the condensing performance desired.
Contact Cannon Boiler Works about our Condensing Economizers
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