Thermal Engineering

Fluid Power Calculator

Calculate the thermal power carried by a flowing fluid given flow rate and temperature change — P = ṁ · Cp · ΔT.

Inputs

Same unit as inlet temperature

Results

Thermal power

—

kW

Thermal power

—

hp

Thermal power

—

BTU/hr

Mass flow rate (ṁ)

—

kg/s

Specific heat (Cp)

—

kJ/(kg·K)

Temperature rise (ΔT)

—

°C

Thermal Power — Flowing Fluid

P = ṁ · Cp · ΔT ṁ (kg/s) = flow rate (m³/s) × density (kg/m³) Cp and ρ evaluated at mean temperature (T₁ + T₂) / 2
P = thermal power (kW) ṁ = mass flow rate (kg/s) Cp = specific heat capacity (kJ/kg·K) ΔT = T₂ − T₁ (K or °C) ρ = fluid density at mean temp (kg/m³) Water: Cp ≈ 4.186 kJ/kg·K, ρ ≈ 1000 kg/m³ ISO oils: Walther / ASTM D1250 temperature-dependent fits Therminol 66: Solutia datasheet polynomial fits