Heat Transfer Takes Place From Vapour Refrigerant To Outside Of Tube Calculator

Heat Transfer Formula:

\[ q = h \times A \times (T_1 - T_2) \]

Coefficient of Heat Transfer (h):

W/m²·K

Area (A):

m²

Vapour Condensing Film Temperature (T₁):

Outside Surface Temperature (T₂):

Heat Transfer (q):

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1. What is Heat Transfer?

Heat transfer is the amount of heat that is transferred per unit of time in some material, usually measured in watts (joules per second). In refrigeration systems, heat transfer occurs from vapour refrigerant to the outside of the tube through condensation.

2. How Does the Calculator Work?

The calculator uses the heat transfer formula:

\[ q = h \times A \times (T_1 - T_2) \]

Where:

\( q \) — Heat transfer rate (W)
\( h \) — Coefficient of heat transfer (W/m²·K)
\( A \) — Surface area (m²)
\( T_1 \) — Vapour condensing film temperature (K)
\( T_2 \) — Outside surface temperature (K)

Explanation: The formula calculates the rate of heat transfer based on the temperature difference and the heat transfer coefficient across a given surface area.

3. Importance of Heat Transfer Calculation

Details: Accurate heat transfer calculation is crucial for designing efficient refrigeration systems, determining heat exchanger sizing, and optimizing energy consumption in thermal systems.

4. Using the Calculator

Tips: Enter all values in appropriate units. The coefficient of heat transfer and area must be positive values. Temperature values should be in Kelvin for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What does a negative heat transfer value indicate?
A: A negative value indicates that heat is being transferred in the opposite direction than expected (from outside to vapour refrigerant).

Q2: What are typical values for heat transfer coefficient?
A: For condensation of refrigerants, typical values range from 1000-5000 W/m²·K depending on the refrigerant and conditions.

Q3: Why use Kelvin for temperature?
A: Kelvin is used because it's an absolute temperature scale where 0 represents absolute zero, making it suitable for thermodynamic calculations.

Q4: How does surface area affect heat transfer?
A: Heat transfer is directly proportional to surface area - larger surface areas allow for greater heat transfer rates.

Q5: What factors influence the heat transfer coefficient?
A: The coefficient depends on fluid properties, flow velocity, surface roughness, and temperature difference.