A gas-fired boiler exhausts 50,000 m3/h of 160 C flue gas. EN159 recovered heat with a heat-pipe exchanger to preheat combustion air.
The Challenge
The flue gas at 160 C carried recoverable heat. Preheating combustion air would cut fuel use. The gas was clean but moist, needing corrosion-resistant recovery.
Why Heat Pipe Air-to-Air Recovery
For gas-boiler flue gas, a heat pipe recovers heat with separated streams and no rotating seal to foul. A condensing section handles moisture. Rotary wheels are excluded due to corrosion and fouling risk.
The EN159 Solution
EN159 heat-pipe modules with condensing option, 50,000 m3/h, combustion air preheated from 20 C to 110 C, stainless walls, 4 degree tilt.
Measured Results
- Recovered heat: about 1.1 MW
- Combustion air preheated from 20 C to 110 C
- Boiler fuel cut by 16 percent
- Estimated payback: 16 months
Compliance and Selection Notes
Heat-pipe recovery, separated streams, corrosion-resistant. Rotary wheel excluded for flue gas.
Frequently Asked Questions
Corrosion concern?
Stainless walls and a condensing design manage moist flue gas.
Why no rotary wheel?
Moisture and trace condensate foul wheel seals; separated recovery avoids that.
Related Guides and Tools
Heat Pipe Heat Exchangers · Boiler Flue Gas Heat Recovery · Industrial Waste Heat Recovery · Heat Exchanger in a Boiler · Contact EN159
Get a Site-Specific Recovery Estimate
Talk to an EN159 application engineer about your gas-fired boiler exhaust stream. Call 15753355505 or visit our contact page for a site-specific recovery estimate.