Energy Analysis and Simulation Notes

Radiance Intensity and Sky Models

  • Radiance Intensities: Computation of radiance intensities on a hemisphere, specifically in relation to the altitude angle.
  • Sky Dome Visualization: The intensity can be drawn and visualized on the sky, under the sky dome.
  • Cloudy Sky Model: An engineering model used to approximate sky conditions, particularly for cloudy skies.
    • This model helps in understanding diffused radiation.
    • Its primary purpose is to be "well enough" accurate for energy analysis.
    • It is accurate for total amounts of energy but may not be "super accurate" for individual patches.

Radiation Flux Calculation

  • Methodology: Calculating radiation flux involves considering radiation between different patches or surfaces.
  • Components of Radiation Flux: This includes:
    • Direct View Contact: Radiation received directly from a source, where the surface has a direct line of sight.
    • Reflected Components: Radiation that has bounced off other surfaces before reaching the target surface.

Modeling Considerations and Corrections

  • Radiation Map: The overall model, often referred to as a "radiation map," should be complete to perform analysis effectively.
  • Ground Plane Accuracy: A critical aspect of modeling is ensuring the ground plane snaps accurately to the actual ground conditions.
    • Incorrect ground plane placement (e.g., too small or not aligned) can introduce modeling mistakes.
    • It is necessary to extend or correct the geometry of the ground plane if it's inadequate to avoid errors.

Simulation and Result Management

  • Running Analysis: Simulations are initiated from a dedicated "simulation panel."
  • Saving Results:
    • Users are prompted to save previous results before running a new analysis, as these results can be "quite large."
    • Naming results (e.g., "first box") allows for saving and organizing different design iterations for future reference.
    • The location where the files are saved is typically provided within the software interface.
  • Initial Design: The first satisfactory simulation result often represents the "initial design" for further evaluation or modification.

Visualization and Interpretation

  • Exploring Results: It's crucial to visualize and explore the simulation output to understand the energy dynamics.
  • Shadow Impact: Visualizations can reveal specific impacts, such as the "shadow impact of the building" on surrounding surfaces or energy collection performance.
  • Quantitative Results: Results are often presented numerically, indicating energy generation, e.g., 1255 kilowatt hours (kWh) or 1400 kWh.
  • Surface Performance: Analysis helps identify which surfaces are performing sub-optimally ("not that great") in terms of energy collection.
  • Geometry Changes and Display: If the geometry of the model is altered, previous results might still be displayed; it is essential to re-run the analysis to see updated outcomes reflecting the changes.
  • Color Ramps:
    • The color ramp used for visualization can be customized to suit user preferences.
    • However, sticking with default color ramps is often helpful as users and collaborators tend to get accustomed to their interpretation, promoting consistency.