Heat Emission Steam Pipes Oil

Overview

Engineering reference data for Heat Emission Steam Pipes Oil in heat transfer.

Key Formulas

Fourier's Law

$q = -k \nabla T$

Heat flux proportional to temperature gradient.

Convective Heat Transfer

$Q = hA(T_s - T_\infty)$

Heat transfer between surface and fluid.

Stefan-Boltzmann Law

$q = \varepsilon \sigma T^4$

Radiative heat flux from a surface.

Thermal Resistance

$R_{th} = \frac{L}{kA}$

Resistance to heat conduction.

Variables

Symbol	Description	Unit
$q$	Heat flux	W/m²
$k$	Thermal conductivity	W/(m·K)
$h$	Convection coefficient	W/(m²·K)
$T$	Temperature	K
$\varepsilon$	Emissivity	—
$\sigma$	Stefan-Boltzmann constant	5.67×10⁻⁸ W/(m²·K⁴)

Oil Bath Heat Emission Data

Viscosity Classifications

Fluid Type	Viscosity (SSU at 100°F)
Light Oils	220 SSU
Heavy Oils	1,100 SSU
Fats	3,833 SSU

Note: Viscosity significantly affects heat transfer performance. Higher viscosity fluids (fats) have substantially lower heat emission rates due to reduced convection and increased thermal resistance.

Coil Surface Area Calculation

The external surface area per unit length of pipe is calculated as:

$A_s = \pi \cdot d \cdot L$

where:

• $d$ = outside diameter of the pipe (m)
• $L$ = length of pipe section (m)

Heat Emission from Coil

The total heat emission from a submerged steam coil is:

$Q = L \cdot A_s \cdot U \cdot \Delta T$

where:

• $L$ = total pipe length (m)
• $A_s$ = external surface area per meter length (m²/m)
• $U$ = heat emission coefficient (W/m²·°C)
• $\Delta T = T_{steam} - T_{oil}$ = temperature difference (°C)

Example: 2" Coil Heating Fat Tank

Given:

• Coil length: $L = 10$ m
• Outside diameter: $d = 60.3$ mm
• Steam temperature: $T_s = 120°C$
• Oil temperature: $T_o = 40°C$
• Heat emission coefficient: $U = 50$ W/m²·°C (natural convection)

Surface area per meter: $A_s = \pi \times 0.0603 \text{ m} \times 1 \text{ m} = 0.189 \text{ m}^2/\text{m}$

Total heat emission: $Q = 10 \times 0.189 \times 50 \times (120 - 40) = 7{,}560 \text{ W} \approx 7.6 \text{ kW}$

Interactive Charts

References

• Original Source