Net Heat Exchange In Transmission Process Calculator

Formula Used:

\[ q_{1-2\ transmitted} = A_1 \times F_{12} \times \tau_m \times (J_1 - J_2) \]

Surface Area of Body 1 (A₁):

m²

Radiation Shape Factor 12 (F₁₂):

Transmissivity of Transparent Medium (τₘ):

Radiosity of 1st Body (J₁):

W/m²

Radiosity of 2nd Body (J₂):

W/m²

Net Heat Exchange (q₁-₂ transmitted):

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1. What is Net Heat Exchange in Transmission Process?

Net Heat Exchange in Transmission Process refers to the amount of heat energy transferred through radiation between two bodies separated by a transparent medium. This calculation is essential in thermal engineering and heat transfer analysis.

2. How Does the Calculator Work?

The calculator uses the radiation heat transfer formula:

\[ q_{1-2\ transmitted} = A_1 \times F_{12} \times \tau_m \times (J_1 - J_2) \]

Where:

\( A_1 \) — Surface Area of Body 1 (m²)
\( F_{12} \) — Radiation Shape Factor 12 (dimensionless)
\( \tau_m \) — Transmissivity of Transparent Medium (dimensionless)
\( J_1 \) — Radiosity of 1st Body (W/m²)
\( J_2 \) — Radiosity of 2nd Body (W/m²)

Explanation: This formula calculates the net radiant heat exchange between two surfaces through a transparent medium, accounting for the surface area, shape factor, medium transmissivity, and the difference in radiosity between the two bodies.

3. Importance of Radiation Heat Transfer Calculation

Details: Accurate calculation of radiation heat transfer is crucial for thermal system design, energy efficiency analysis, HVAC system optimization, and various industrial processes involving heat exchange through transparent media.

4. Using the Calculator

Tips: Enter all values in appropriate units. Surface area must be positive, shape factor and transmissivity must be between 0 and 1, and radiosity values should be non-negative. Ensure consistent units throughout.

5. Frequently Asked Questions (FAQ)

Q1: What is radiation shape factor?
A: Radiation shape factor (view factor) is the fraction of radiation energy leaving one surface that directly strikes another surface.

Q2: How does transmissivity affect heat transfer?
A: Transmissivity represents the fraction of radiation that passes through the medium. Higher transmissivity allows more radiation to be transmitted between surfaces.

Q3: What is radiosity?
A: Radiosity is the total radiation energy leaving a surface per unit area per unit time, including both emitted and reflected radiation.

Q4: When is this calculation applicable?
A: This calculation applies to systems where two surfaces exchange radiant energy through a transparent or semi-transparent medium, such as glass, air, or other transparent materials.

Q5: What are typical values for transmissivity?
A: Transmissivity ranges from 0 (opaque) to 1 (completely transparent). For clear glass, it's typically 0.85-0.90; for air, it's approximately 1.0.