Formula & worked example
m=Q/(Cp·ΔT); volumetric flow=m/ρ.
1,000 kW rejected across a 5.5°C water range requires about 43.5 L/s for water.
Plant engineering calculator · Updated Sep 17, 2026
Condenser Water Flow Calculator — Heat Rejection, Range & GPM
Calculate condenser-water flow from heat rejection and water temperature range, with SI and US flow outputs.
Inputs
Live engineering result
Mass flow 43.434826 kg/s
Water flow 43.565523 L/s
Water flow 156.83588 m³/h
Water flow 690.52761 US gpm
Assumptions & limits
- Uses entered water density and specific heat.
- Condenser heat rejection is cooling load plus compressor/equipment heat, not cooling load alone.
Frequently asked questions
What does this Condenser Water Flow Calculator calculate?
Calculate condenser-water flow from heat rejection and water temperature range, with SI and US flow outputs.
Can I use the result for equipment selection?
Use the result as an engineering screening and cross-check. Confirm final selections against manufacturer performance data, design conditions, applicable standards and local code.
Why does MAXScanner show assumptions?
Plant calculations can move materially with pressure, temperature, fluid properties, diversity and operating conditions. Visible assumptions make the result auditable.