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Why is a FLU-ACE more efficient than the typical feedwater economizer?

12/15/2015

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FLU-ACE uses direct contact gas-to-liquid mass transfer and heat exchange. It condenses almost all of the water vapour (steam) from the exhaust, and this latent heat is the source of the bulk of the waste heat available in a boiler flue gas.  

“Sensible” heat refers to energy that can be released through a temperature change.  Heating water from 32°F to 212°F (0°C to 100°C) is a change in “sensible” heat.  “Latent” heat refers to energy stored or released in a phase change, such as the heating that is done when steam changes from vapor to water, without any temperature change.  As it turns out, the energy released when a pound of steam turns into a pound of water, all happening at 212°F (100°C) (no temperature change, so this is latent heat) is some five times the energy released when that same pound of water is cooled from 212°F to 32°F (100°C to 0°C).  All this to say there is a lot of energy released in the phase change from water vapor to liquid water.  

Therefore, condensing heat recovery technology, which can capture latent heat, is much more efficient than the typical feedwater economizer, which can only capture sensible heat. When it comes to overall boiler plant efficiency, FLU-ACE is able to provide a 10% to 15% improvement, while a typical feedwater economizer provides an improvement of 2% to 4%.
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  • About
    • Overview
    • Our impact to date
    • Senior Management & Board of Directors
    • Careers
  • Products
    • Our products
    • GEM steam traps >
      • GEM overview
      • GEM case studies
      • GEM brochures
      • GEM FAQ
      • GEM steam trap survey
    • FLU-ACE heat recovery >
      • Heat recovery overview
      • Heat recovery case studies
      • Heat recovery white papers
      • Heat recovery brochures
      • Heat recovery FAQ
    • BEI heat recovery >
      • BEI Overview
      • BEI Case Studies
      • Contact BEI
    • CoGeneration >
      • CoGeneration overview
      • CoGeneration case studies
    • DRY-REX biomass dryer
    • Turn-key solutions
    • SOFAME Products
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    • Food and beverage
    • Pulp and paper
    • Hospitals
    • Pharmaceuticals
    • Chemicals and petrochemicals
    • Other industry sectors
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