Tools
What your hot air costs, and what it could cost
Six numbers from your plant, and the answer in money per year. This calculator puts your existing hot air generator against a UDBT CFHAG on annual fuel bill, payback, CO2 avoided and a ten-year cash flow.
Engineering Comparison Notice: All calculator outputs are thermodynamic estimates calibrated against measured boiler balances. Actual savings depend on your fuel ultimate analysis, operating shifts, and site ambient conditions.
Design Benchmark
80% Efficiency
CFHAG under-bed FBC vs 72–75% for conventional solid fuel units.
Thermodynamic Method
How the Calculations are Structured
- Heat duty 01
- Q = air mass flow x specific heat x (hot air temperature - inlet air temperature), with Cp = 0.2382 + 0.0000297 x mean air temperature kcal/kg.degC.
- Fuel 02
- Firing rate = duty / (efficiency x blend calorific value). Calorific value, price and CO2 factor are weighted by mass; the first fuel takes the share you set and the second takes the remainder.
- Efficiency 03
- 80% for the CFHAG under-bed fluidised combustion with flue gas recirculation, against 72-75% for a conventional solid fuel unit, or 85% indirect and 98% direct for oil and gas. Stack temperature suggests a baseline at 0.04 points per degC above reference.
- Modes 04
- Oil and gas is a fuel-only comparison. Solid fuel runs the full life cycle: CFHAG capital 20% above your unit, and a major replacement at 10% of your capital cost every 3 years on yours and every 5 on ours.
- Calorific values 05
- Typical as-received values for the fuel selected. CO2 factors follow IPCC 2006 Guidelines Vol. 2 Table 1.4; biomass is shown as zero because biogenic CO2 is reported separately under the GHG Protocol.
- Currency and units 06
- Changing the currency changes the symbol and number format only, so enter every price and equipment cost in the currency you have selected. Direct-fired units put combustion products into the process air; a CFHAG delivers clean indirect air.
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We will calculate the precise comparison against a measured heat balance for your exact plant parameters and quote a delivered price.