Queendom Tools

Condensate Recovery Energy Savings Calculator

For energy consultants scoping a steam-system audit, this gives the first-pass condensate-return business case — heat, fuel and annual cost — before any site measurement work is commissioned. Recovering hot condensate saves heat and money: Q = m x 4.186 x (Tc - Tm) / 3600 kW, which translates into fuel saved through the boiler efficiency and priced per year.

Results

Heat Recovered
0.00 kW
Fuel Saved Annually
0.00 kWh/yr
Annual Saving
0.00 /yr

Disclaimer: For preliminary estimation only, not a substitute for review by a qualified/licensed engineer. Water and treatment chemical savings are not included.

How to Use This Calculator

  1. Enter the condensate return rate in kg/h.
  2. Enter the condensate temperature and the make-up water temperature in °C.
  3. Enter the annual operating hours (h/yr).
  4. Enter the boiler efficiency (%) and the fuel price (currency per kWh).
  5. Read the heat recovered in kW, the fuel saved in kWh/yr and the annual saving directly below.

FAQ

How is the heat recovered from returned condensate calculated?

Q (kW) = m × 4.186 × (Tc − Tm) ÷ 3600, where m is the condensate return rate in kg/h and Tc and Tm are the condensate and make-up water temperatures in °C.

Why is boiler efficiency applied after the heat calculation?

Recovered heat only displaces fuel at the boiler's efficiency, so fuel input = Q ÷ (efficiency ÷ 100) — at 80% efficiency, every 1 kW of recovered heat avoids 1.25 kW of fuel input.

Does this calculator include water and chemical treatment savings?

No. It covers fuel only; water and treatment chemical savings are not included in the annual figure.

What happens if the condensate temperature is lower than the make-up water temperature?

Q comes out at zero or negative, so the tool reports no heat recovered and warns that the condensate is not hotter than the make-up water.