Heat Transfer Coefficient for Subcooling Outside Horizontal Tubes Calculator

Heat Transfer Coefficient For Subcooling Outside Horizontal Tubes Calculator

Subcooling Coefficient Formula:

\[ h_{sc} = 116 \times \left( \frac{k_f^3 \times \rho_f}{D_O} \times \frac{C_p}{\mu} \times \beta \times (T_{Film} - T_{Bulk}) \right)^{0.25} \]

Thermal Conductivity in Heat Exchanger (kf):

W/m·K

Fluid Density in Heat Transfer (ρf):

kg/m³

Pipe Outer Dia (DO):

Specific Heat Capacity (Cp):

J/kg·K

Fluid Viscosity at Average Temperature (μ):

Pa·s

Thermal Expansion Coefficient for Fluid (β):

1/K

Film Temperature (TFilm):

Bulk Fluid Temperature (TBulk):

Subcooling Coefficient (hsc):

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1. What is Subcooling Coefficient?

The Subcooling Coefficient is the heat transfer coefficient when the condensed vapor is further subcooled to lower temperature in a condenser. It represents the efficiency of heat transfer during the subcooling process outside horizontal tubes.

2. How Does the Calculator Work?

The calculator uses the Subcooling Coefficient formula:

\[ h_{sc} = 116 \times \left( \frac{k_f^3 \times \rho_f}{D_O} \times \frac{C_p}{\mu} \times \beta \times (T_{Film} - T_{Bulk}) \right)^{0.25} \]

Where:

\( h_{sc} \) — Subcooling Coefficient (W/m²·K)
\( k_f \) — Thermal Conductivity in Heat Exchanger (W/m·K)
\( \rho_f \) — Fluid Density in Heat Transfer (kg/m³)
\( D_O \) — Pipe Outer Diameter (m)
\( C_p \) — Specific Heat Capacity (J/kg·K)
\( \mu \) — Fluid Viscosity at Average Temperature (Pa·s)
\( \beta \) — Thermal Expansion Coefficient for Fluid (1/K)
\( T_{Film} \) — Film Temperature (K)
\( T_{Bulk} \) — Bulk Fluid Temperature (K)

Explanation: The equation accounts for various fluid properties and thermal characteristics to determine the heat transfer coefficient during subcooling process.

3. Importance of Subcooling Coefficient Calculation

Details: Accurate calculation of subcooling coefficient is crucial for designing efficient heat exchangers and condensers, optimizing energy transfer, and ensuring proper system performance in refrigeration and HVAC systems.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Ensure all values are positive and temperature difference (TFilm - TBulk) is positive for valid calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is subcooling in heat transfer?
A: Subcooling refers to the process of cooling a liquid below its saturation temperature without changing its phase, which increases the efficiency of heat transfer systems.

Q2: Why is subcooling important in condensers?
A: Subcooling improves system efficiency by ensuring the refrigerant leaves the condenser as a liquid, preventing flash gas formation and increasing the refrigeration effect.

Q3: What are typical values for subcooling coefficient?
A: Typical values range from 1000-6000 W/m²·K depending on the fluid properties, temperature difference, and system configuration.

Q4: How does pipe diameter affect subcooling coefficient?
A: Smaller pipe diameters generally result in higher heat transfer coefficients due to increased surface area to volume ratio and better fluid dynamics.

Q5: When is this calculation most applicable?
A: This calculation is specifically designed for subcooling outside horizontal tubes in heat exchangers and condensers, particularly in refrigeration systems.