Heat Loss Breakdown Results

The 'Steady-State' tab has detailed heating design results (displayed as a histogram and table by default).

For more on how the output is calculated see: Calculation of DesignBuilder Output from EnergyPlus Report Variables.

• Air Temperature - the calculated average temperature of the air.
• Radiant Temperature  - the (area * emissivity) weighted average of the zone inside surface temperatures.
• Operative Temperature - The mean of the internal air and radiant temperatures.
• Outside Dry-Bulb Temperature.
• Glazing - heat loss through all glazing.
• Walls - heat loss through all external walls.
• Ceilings (int) - heat loss through internal ceilings (e.g. zone above is colder).
• Floors (int) - heat loss through internal floors (e.g. zone below is colder).
• Floors (ext) - heat loss through external floors (not ground floor, e.g. floor in cantilevered space, roof eaves etc).
• Ground Floors - heat loss through ground floors.
• Doors and Vents - conduction heat loss through doors and vents.
• Partitions (int) - heat loss through all internal partitions (e.g. adjacent zone is colder).
• External Infiltration - heat loss through air infiltration (non-unintentional air entry through cracks and holes in building fabric).
• External Mechanical Ventilation - is the heat loss due to the entry of outside air through the air distribution system.  View can exclude mechanical ventilation from the heating design calculations by unchecking the 'Mechanical ventilation On' Model Data.
• Internal Natural Ventilation - heat loss due to air exchange through open internal windows, doors, vents, holes and virtual partitions to adjacent spaces.
• Zone Sensible Heating - heat delivered to maintain the internal heating design temperature.

Note: The Heating delivered is the sum of the component heat loss values.

Surface heat loss data (walls, ceilings, floors etc) refers to heat transfer from the zone to the inside surface of the building elements.

You can also customise the data displayed and display style using the Display Options panel.