by
Energy saving and CO₂ reduction calculator for industrial heat recovery | BOIXAC
Technical blog › Energy efficiency

Energy saving and CO₂ reduction calculator
for industrial heat recovery

Indicative tool to estimate recoverable thermal power, fuel savings and approximate CO₂ emission reduction from installing a heat recovery heat exchanger. Enter your process data and get an estimate in seconds.

BOIXAC Tech SL GHG Protocol reference factors · User-editable values Indicative tool — estimative results with no regulatory value
Important notice — please read before using this tool This tool is strictly indicative. Results are simplified estimates based on the thermal balance Q = ṁ · cp · ΔT · η and reference emission factors. They have no technical, legal or regulatory validity whatsoever. BOIXAC Tech SL accepts no liability arising from the use of this tool or its results for any purpose.
🌍 1 · Select territory
📊 Reference emission factors — user-editable

The values shown are GHG Protocol generic references. You may edit them to match the actual conditions of your process or energy supply contract. Click "Restore" to revert to the original values.

FuelEmission factorReference source

These are generic GHG Protocol reference values. Apply the official emission factors published by the competent authority in your country for any formal purpose.

2 · Process data
Mass flow rate of the hot stream available for heat recovery. Typical values: industrial furnaces 2,000–50,000 kg/h; steam boilers 1,000–20,000 kg/h; cogeneration engines 500–5,000 kg/h.
°C
Temperature at the process outlet, before the heat exchanger.
°C
Minimum outlet temperature of the hot fluid. For combustion gases, never go below the acid dew point (typically 120–150 °C for natural gas, 140–160 °C for diesel).
kJ/(kg·K)
Dry air ≈ 1.006 · Combustion gases ≈ 1.05–1.15 · Steam ≈ 2.0 · Water ≈ 4.18 kJ/(kg·K)
h/year
Continuous operation: 8,760 h/year. 2-shift, 5 days: ≈ 4,000 h/year.
%
Typical industrial heat recovery: 65–85%. Default conservative value: 75%.
3 · Fuel
Select the fuel. The emission factor is taken from the table above.
€/kWh
Adapt the price to your actual contract.
%
Conventional boiler: 85–90%. Condensing: 95–105%. Steam: 80–88%.
€/t CO₂
Indicative carbon market price. Set to 0 to ignore this factor.
4 · Investment (optional — for ROI)
€
Includes equipment, installation and commissioning. Leave blank to skip ROI. Note: ROI may appear very short (months) for high flow-rate, high ΔT processes — always verify against a real quotation and actual process conditions.
€/year
Cleaning, inspection, spare parts. Typically 0.5–2% of equipment cost per year.
Indicative estimate
Calculation detail (estimative)
ParameterEstimative value
Limitation of results

These results are purely estimative. They have been obtained using the simplified thermal balance Q = ṁ · cp · ΔT · η, without considering radiation or pipe conduction losses, seasonal load variations or the acid dew point. They do not represent the actual behaviour of any specific equipment or installation. For a rigorous technical estimate, please contact the BOIXAC technical office.

Legal notice and limitation of liability Strictly informative and indicative tool. Results have no technical, legal or regulatory validity and may not be used for any official, contractual or regulatory purpose. The emission factors shown are indicative reference values. BOIXAC Tech SL accepts no liability for decisions taken based on the results of this tool.
Do you need a real technical estimate for your process?

The BOIXAC technical office analyses the actual conditions of your process and proposes the optimal heat recovery solution with a detailed thermal balance.

Contact our technical office