Temperature Rise Calculator
Calculate the temperature rise in electrical conductors, resistive elements, or fluid systems due to power dissipation or heat input.
Calculation Mode
Electrical Parameters
Thermal Parameters
Results will appear here.
Formulas Used
Electrical (I²R Heating):
P = I² × R
ΔT = P × Rth
Tmax = Tambient + ΔT
Power Dissipation (General):
ΔT = P × Rth
Tmax = Tambient + ΔT
Fluid / Liquid Cooling:
ΔT = Q / (ṁ × cp)
Toutlet = Tinlet + ΔT
Where: Q = heat input (W), ṁ = mass flow rate (kg/s), cp = specific heat capacity (J/kg·°C)
Assumptions & References
- Steady-state thermal conditions are assumed (no transient effects).
- Thermal resistance is assumed constant and independent of temperature.
- For electrical mode, resistance is assumed constant (temperature coefficient of resistance not applied).
- Fluid mode assumes incompressible, single-phase flow with constant specific heat capacity.
- Specific heat values: Water 4186 J/kg·°C, Air 1005 J/kg·°C, Ethylene Glycol 2090 J/kg·°C, Engine Oil ~2386 J/kg·°C (at ~25°C).
- References: Incropera & DeWitt, Fundamentals of Heat and Mass Transfer; IEEE Std 738 for conductor thermal ratings.