Buildingphysics Engineering

Vapor Barrier Glazing Steady-State Heat Transfer Rate Calculator

Vapor Barrier Glazing Steady-State Heat Transfer Rate Calculator engineering calculator.

Quick Answer

Calculate Vapor Barrier Glazing Steady-State Heat Transfer Rate Calculator

Calculator

Steady-state heat transfer rate per unit area (W⁄m²)
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Result Interpretation

Vapor Barrier Glazing Steady-State Heat Transfer Rate Calculator computes Steady-state heat transfer rate per unit area in W/m^2 using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Exterior surface thermal resistance = 0.04
  • Interior surface thermal resistance = 0.13
  • Thermal resistance of gas-filled cavity (including vapor barrier effect on convection) = 0.18
  • Thermal resistance of inner glass pane = 0.0028
  • Thermal resistance of outer glass pane = 0.0028
  • Indoor air temperature = 294.15
  • Outdoor air temperature = 273.15

Expected Result:

  • Steady-state heat transfer rate per unit area = 59.055118110236

Engineering Interpretation:

Under the given input conditions, the calculated result is: Steady-state heat transfer rate per unit area = 59.055118110236 W/m^2.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

steady-state heat transfer rate per unit area = (indoor air temperature - outdoor air temperature) / (interior surface thermal resistance + thermal resistance of inner glass pane + including vapor barrier effect on convection + thermal resistance of outer glass pane + exterior surface thermal resistance)

Formula family: formula_buildingphysics_vapor_barrier_glazing_heat_transfer_calculator

Variables

SymbolLabelRoleDescription
T_inside Indoor air temperature INPUT Indoor air temperature
T_outside Outdoor air temperature INPUT Outdoor air temperature
R_si Interior surface thermal resistance INPUT Interior surface thermal resistance
R_se Exterior surface thermal resistance INPUT Exterior surface thermal resistance
R_glass1 Thermal resistance of inner glass pane INPUT Thermal resistance of inner glass pane
R_glass2 Thermal resistance of outer glass pane INPUT Thermal resistance of outer glass pane
R_gap Thermal resistance of gas-filled cavity (including vapor barrier effect on convection) INPUT Thermal resistance of gas-filled cavity (including vapor barrier effect on convection)
heat_transfer_rate Steady-state heat transfer rate per unit area OUTPUT Steady-state heat transfer rate per unit area

Calculation Steps

  1. Enter the indoor air temperature in K.
  2. Enter the outdoor air temperature in K.
  3. Enter the interior surface thermal resistance in m^2·K/W.
  4. Enter the exterior surface thermal resistance in m^2·K/W.
  5. Enter the thermal resistance of inner glass pane in m^2·K/W.
  6. Enter the thermal resistance of outer glass pane in m^2·K/W.
  7. Enter the thermal resistance of gas-filled cavity (including vapor barrier effect on convection) in m^2·K/W.
  8. Step 1: Compute steady-state heat transfer rate per unit area.
  9. Read the steady-state heat transfer rate per unit area (W/m^2) from the results.

Engineering Summary

Calculate Vapor Barrier Glazing Steady-State Heat Transfer Rate Calculator

Frequently Asked Questions

What does this calculator calculate?

The Vapor Barrier Glazing Steady-State Heat Transfer Rate Calculator estimates Steady-state heat transfer rate per unit area based on the input parameters you provide

Why is indoor air temperature important in this calculation?

indoor air temperature is directly proportional to steady-state heat transfer rate per unit area. When you enter indoor air temperature in K, the calculator uses it in the engineering formula to compute the output

How should I interpret the result steady-state heat transfer rate per unit area?

The calculator outputs steady-state heat transfer rate per unit area in W/m^2. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Indoor air temperature (K), Outdoor air temperature (K), Interior surface thermal resistance (m^2·K/W), Exterior surface thermal resistance (m^2·K/W), Thermal resistance of inner glass pane (m^2·K/W), Thermal resistance of outer glass pane (m^2·K/W), Thermal resistance of gas-filled cavity (including vapor barrier effect on convection) (m^2·K/W). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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