• Select all — Used to select all rooms with a single click.
• Deselect all — Used to deselect all rooms with a single click.
• OK — Applies all changes and closes the Room selection view.
• Cancel — Cancels all changes, and closes the Room selection view.

• Design data:
  • Room design temperatures - Defines the room design temperatures for the project as Air or Resultant temperatures.
  • Outside design temperatures - Sets the design temperatures for the peak month (usually July) and the minimum month (usually January). Design temperatures for the day of the calculation (e.g. June 15) are computed by assuming sinusoidal temperature variations through the year, with a peak at July and minimum in January. The actual design day for the calculation determines the position on the sine wave and hence the maximum and minimum outside dry bulb temperatures. Wet bulb temperatures are computed hourly, using a similar technique to dry bulb. The Outside design temperatures could be negative too.
• Fixed temperature air - When Include a fixed temperature air to rooms is checked, the calculation is performed assuming a potentially infinite supply of heating or cooling air at a done with a fixed temperature. Therefore the calculated design air flow rate is always able to meet any load or change in load no matter how large or abrupt. In reality air flow rates are limited by duct sizes and fan capacities. Also enables the remaining air flow options Air change, per person, per area, and Air temperature.
• Rooms - Used to select the rooms for running the calculation.
• Heating systems:
  • Main heating system - Sets 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. level	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 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.

  • Use custom system - When on, you set the Convective heat input and Heigh allowance at 5m,10m,20m options manually.

Used to view a summary report of the results of the CIBSE heat loss calculation conducted using the Basic Model steady state heat loss model.

Used to view a full report of the results for each room of the CIBSE heat loss calculation conducted using the Basic Model steady state heat loss model.

Used to view a graphical report of the results for each room of the CIBSE heat loss calculation conducted using the Basic Model steady state heat loss model.