Incident Flux When Flow Is Between Cover And Absorber Plate Calculator

Formula Used:

\[ S_{flux} = h_{fp} \times (T_{pm} - T_{fi}) + (h_r \times (T_{pm} - T_c)) + (U_b \times (T_{pm} - T_a)) \]

Convective Heat Transfer Coeff Of Solar (hfp):

W/m²·K

Average Temperature Of Absorber Plate (Tpm):

Inlet Fluid Temperature Flat Plate Collector (Tfi):

Equivalent Radiative Heat Transfer Coefficient (hr):

W/m²·K

Temperature Of Cover (Tc):

Bottom Loss Coefficient (Ub):

W/m²·K

Ambient Air Temperature (Ta):

Flux Absorbed By Plate (Sflux):

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1. What Is The Incident Flux Formula?

The incident flux formula calculates the solar flux absorbed by the absorber plate in a solar collector system. It accounts for convective heat transfer, radiative heat transfer, and bottom heat losses to determine the total energy absorbed.

2. How Does The Calculator Work?

The calculator uses the formula:

\[ S_{flux} = h_{fp} \times (T_{pm} - T_{fi}) + (h_r \times (T_{pm} - T_c)) + (U_b \times (T_{pm} - T_a)) \]

Where:

\( S_{flux} \) — Flux absorbed by plate (W/m²)
\( h_{fp} \) — Convective heat transfer coefficient (W/m²·K)
\( T_{pm} \) — Average temperature of absorber plate (K)
\( T_{fi} \) — Inlet fluid temperature (K)
\( h_r \) — Equivalent radiative heat transfer coefficient (W/m²·K)
\( T_c \) — Temperature of cover (K)
\( U_b \) — Bottom loss coefficient (W/m²·K)
\( T_a \) — Ambient air temperature (K)

Explanation: The equation calculates the total energy absorbed by considering convective transfer between plate and fluid, radiative transfer between plate and cover, and conductive losses through the bottom.

3. Importance Of Flux Calculation

Details: Accurate flux calculation is essential for designing efficient solar thermal systems, optimizing energy collection, and evaluating system performance under various operating conditions.

4. Using The Calculator

Tips: Enter all temperature values in Kelvin, heat transfer coefficients in W/m²·K. All values must be positive numbers. The calculator will compute the flux absorbed by the plate in W/m².

5. Frequently Asked Questions (FAQ)

Q1: What is convective heat transfer coefficient?
A: It represents the efficiency of heat transfer between the absorber plate and the fluid stream through convection.

Q2: Why use radiative heat transfer coefficient?
A: It accounts for heat transfer through radiation between the absorber plate and the cover glass.

Q3: What does bottom loss coefficient represent?
A: It quantifies the heat losses through the bottom insulation of the solar collector.

Q4: Why are all temperatures in Kelvin?
A: Kelvin is the absolute temperature scale required for thermodynamic calculations involving heat transfer.

Q5: What are typical values for these parameters?
A: Typical values vary by system design: hfp (2-10 W/m²·K), hr (5-15 W/m²·K), Ub (0.5-2 W/m²·K), with temperatures depending on operating conditions.