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Plant Engineering Calculator

Updated Sep 18, 2026

Condensate Cooling Duty Calculator — Sensible Heat, kW & Annual Energy

Calculate sensible cooling duty when hot condensate is cooled to a target temperature, plus annual recoverable or rejected thermal energy.

Live calculationWorking shownPrivate in browser

Inputs

Results

Cooling duty 93.02 kW
Heat rate 317405 BTU/h
Annual thermal energy 558133 kWh
Temperature drop 40.0 °C
More actions

Shared links reopen these inputs. Recent and saved calculations stay in this browser unless you clear site data.

Formula

Q=ṁCp(Tin−Tout)/3600.

Your calculation, step by step

These steps use the values currently entered above so the result can be checked independently.

  1. 1.Temperature drop ΔT = 90.00 − 50.00 = 40.00 °C.
  2. 2.Heat rate = ṁCpΔT = 2000.00 kg/h × 4.1860 kJ/kg-K × 40.00 K = 334880.00 kJ/h.
  3. 3.Convert kJ/h to kW: 334880.00 ÷ 3600 = 93.0222 kW.
  4. 4.Annual sensible thermal energy = 93.0222 × 6000 = 558133.3 kWh.

How to use this calculator

  1. Enter measured or design values using the units shown beside each field.
  2. Review the live results and the substituted calculation steps before using the estimate.
  3. Check the assumptions below, then continue to a related calculator when the next engineering decision needs another model.

Worked example

Cooling 2,000 kg/h condensate from 90°C to 50°C releases about 93 kW of sensible heat using Cp=4.186 kJ/kg-K.

Assumptions and limits

  • Sensible liquid cooling only; flash steam and phase change require a steam-property calculation.
  • Use an appropriate liquid heat capacity when chemistry or temperature makes the water approximation unsuitable.

How to interpret the result

Treat the primary result as an engineering screening value, then use the secondary outputs to understand scale, energy or operating impact. Confirm site measurements, equipment limits and applicable standards before making a design or control change.

Questions engineers ask

Why does this calculator exclude flash steam?

It models sensible cooling of liquid condensate only: m·Cp·ΔT. If pressure reduction causes flashing or the inlet is not fully liquid, phase-change enthalpy must be handled separately with steam properties.

What heat capacity should I use for hot condensate?

The 4.186 kJ/kg-K default is a convenient water approximation. For a wider temperature range, unusual chemistry or tighter energy balances, use a property value appropriate to the actual liquid temperature and composition.

Is all calculated condensate cooling duty recoverable?

No. The result is the sensible thermal rate available between the entered temperatures. Recoverable useful energy depends on exchanger approach, fouling, return-system design, receiving load and operating simultaneity.

Continue the calculation

Use the next calculator in the same engineering workflow instead of restarting from search.

condensate recovery energy savingscondensate contamination lossheat exchanger duty
Methodology. MAXScanner shows the governing formula, entered values and calculation outputs so the estimate is auditable. The calculator is a screening aid; assumptions and equipment-specific limits remain part of the engineering review.