OpenBuildings™ Station Designer Help

Full report tab

Contains controls used to view a full report of the ASHRAE heat loss calculation results.



To view results, select the report component from the left panel. The report will appear in the right panel. With the full report, you can view detailed results for individual rooms.

Tip: You can open the Results Viewer utility to step through the calculations for displayed results by selecting the result value and clicking for more information (as prompted).
SettingDescription
Design basis Used to display key design parameters considered for the ASHRAE Heat Loss calculation. Selecting Design basis in the selector panel (left) updates the reports display panel (right), scrolling to the Design basis display.
  • Location — Displays the project location set for the project in the Properties dialog box’s Properties For: Site panel.
  • Design Day — Displays the day on which the greatest loads are experienced. The design day is used to compute fabric losses using room and location information.
  • Heat loss model — Displays the name of the heat loss model used for the calculation.
  • Rooms included — Displays the number of rooms included in the calculation.
Results for room For the selected room, the room name is displayed in the report panel section for that room.
Temperatures Contains controls used to display calculated design temperature fluctuations at peak time for the room.
  • Resultant — Displays the room design Resultant temperature delta. Resultant temperature is defined as 1/2 Air temperature and 1/2 Mean radiant temperature.
  • Environmental — Displays the environmental temperature delta. The environmental temperature from the outside and inside is used to calculate the environmental temperature changes through the room envelope to the outside.
  • Air — Displays the room design Air temperature.
  • Mean radiant — Displays the Mean radiant temperature delta. The Mean radiant temperature (MRT) of a room is the measure of the combined effects of temperatures of surfaces within that room. The larger the surface area and the closer one is to it, the more effect the surface temperature of that surface has on each other. The MRT is the measure of all these surface areas and temperatures.
Heating system Displays the name of the standard heating system being used in the heat loss calculation. The following default data is available for standard systems:
System %Heat Conv. Height Allowance (%)
16.4 ft (5 m) 32.8 ft (10 m) 65.6 ft (20 m)
Warm floor 33 0 0 0
Warm ceiling 33 0 5 .
Med/high temp rad. panels downward 10 0 0 5
Natural warm convectors 90 0 5 .
Forced warm air cross flow at low level 90 5 15 30
Forced warm air downward from high level 100 5 10 20
Med/high temp cross radiation, int. Ievel 10 0 5 10
Column radiators 80 0 5 .
Double/triple radiator panels 70 0 5 .
Single panel radiators 50 0 5 .

No heat gains at all are considered, except for internal surfaces (partitions), where the specified adjacent temperature results in a heat gain. The specified room height is used to determine the height allowance, using room data stored within the program depending on the heating system specified (see table of height allowances). The height allowance is linearly interpolated between values, assuming an allowance of zero at floor level. For rooms higher than 65.6 ft (20 m), the 65.6 ft (20 m) value is used. If a system does not show a height allowance at some heights, this indicates that the system should not be used in rooms of that height.

Total room floor area Displays the total floor area for the selected room.
  • Losses per unit area — Displays the heat losses per unit area (ie; square meter) in the selected room.
Total room volume Displays the total volume for the selected room.
  • Losses per unit volume — Displays the heat losses per unit volume (ie; cubic meter) in the selected room.
Fabric losses table Displays fabric losses for each room surface.
  • Surface — Displays the surface type. The surface column displays all the surfaces that make up the selected room.
  • Area — Displays the area for each room surface. Note that the ground floor unit is given in terms of its perimeter length and not the area.
  • U-Value — Displays the U-Value for each room surface. The U-Value comes from the fabric data associated with the room surfaces.
  • Temp diff. — Displays the temperature difference between the outside and inside of each room surface.
  • Heat loss — Displays the heat loss across each room surface.
Total fabric loss Displays the total fabric loss for the selected room. Total fabric losses are the sum of the losses in the Fabric losses table.
Infiltration loss Displays the total infiltration loss for the selected room.
Total room heat loss Displays the total room heat loss. The total room heat loss is the sum of the fabric and infiltration losses.
Parent topic: ASHRAE Heat Loss