Convective Heat Transfer Coefficient Of Storage Type Heat Exchanger Given Time Factor Calculator

Convective Heat Transfer Coefficient Formula:

\[ h_{Conv} = \frac{n \times c_s \times M_L}{SA \times t_{total}} \]

Time Factor (n):

Specific Heat of Matrix Material (cₛ):

J/kg·K

Mass of Solid (Mₗ):

Surface Area (SA):

m²

Total Time Taken (tₜₒₜₐₗ):

Convective Heat Transfer Coefficient (hConv):

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1. What is Convective Heat Transfer Coefficient?

The convective heat transfer coefficient (hConv) quantifies the heat transfer rate due to convection between a surface and a fluid moving past it. It represents the effectiveness of convective heat transfer and is measured in W/m²·K.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ h_{Conv} = \frac{n \times c_s \times M_L}{SA \times t_{total}} \]

Where:

\( n \) — Time factor (dimensionless)
\( c_s \) — Specific heat of matrix material (J/kg·K)
\( M_L \) — Mass of solid (kg)
\( SA \) — Surface area (m²)
\( t_{total} \) — Total time taken (s)

Explanation: This formula calculates the convective heat transfer coefficient for storage type heat exchangers by considering the time factor, material properties, mass, surface area, and total time.

3. Importance of Convective Heat Transfer Coefficient

Details: The convective heat transfer coefficient is crucial in designing heat exchangers, predicting thermal performance, and optimizing energy efficiency in various engineering applications including HVAC systems, industrial processes, and electronic cooling.

4. Using the Calculator

Tips: Enter all values with appropriate units. Ensure all inputs are positive numbers. The calculator will compute the convective heat transfer coefficient in W/m²·K.

5. Frequently Asked Questions (FAQ)

Q1: What factors affect the convective heat transfer coefficient?
A: Fluid properties, flow velocity, surface geometry, and temperature difference all influence the convective heat transfer coefficient.

Q2: How does this differ from conductive heat transfer?
A: Convection involves fluid motion, while conduction occurs through direct contact without bulk fluid movement.

Q3: What are typical values of hConv?
A: Values range from 5-25 W/m²·K for natural convection to 50-1000+ W/m²·K for forced convection, depending on the fluid and conditions.

Q4: Why is the time factor important in this calculation?
A: The time factor accounts for the temporal elements in heat transfer processes, particularly in storage-type heat exchangers where thermal energy is stored and released over time.

Q5: Can this formula be used for all types of heat exchangers?
A: This specific formula is designed for storage-type heat exchangers. Other heat exchanger types may require different calculation methods.