Cold makeup water stole heat you already paid to generate. Adjusted feed temperature shows how much economizers help. This aft calculator quantifies feed temp gains on boiler efficiency.
How to Use This Aft Calculator
Enter makeup water temperature. Enter economizer outlet or deaerator temperature. Add fuel flow or boiler output if efficiency mode is on. Read adjusted feed temperature and heat recovery estimate.
Aft Calculator Formula Explained
AFT is the weighted feed temperature entering the boiler after mixing and heating stages. Higher AFT lowers fuel needed per pound of steam.
Key Terms for Aft Calculator
When you use a aft calculator, these terms show up in inputs, results, or follow-up conversations: adjusted feed temperature, economizer, and deaerator are core to most aft calculations. You may also see condensate return, boiler efficiency, and makeup water on reports, quotes, or assignments. Knowing what each field means prevents swapped inputs and misread results.
Real Example With This Aft Calculator
Raising feed from 70°F to 200°F via economizer cuts fuel use several percent on many industrial boilers.
Why Aft Calculator Math Matters
Energy audits highlight AFT before stack economizer projects.
Common Mistakes With a Aft Calculator
Using ambient temp when deaerator runs hotter. Ignoring condensate return share in the mix.
Pro Tips for Better Aft Calculator Results
Measure actual feed line temp, not design sheet. Track AFT seasonally as cooling water shifts.
Frequently Asked Questions
Adjusted feed temperature after heating stages before the boiler proper.
Higher feed temp reduces fuel per unit steam.
Both raise AFT. Placement depends on plant layout.
Yes.
Boiler engineers and energy auditors.
Yes. Hot condensate raises the blend temperature.
So Here's the Bottom Line
Feed temperature is tied to fuel dollars. Use the aft calculator when you evaluate economizer upgrades. Measure, model, then invest.
Disclaimer: Engineering values need professional verification.