Design data
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Room design temperatures — The Room
temperatures can be specified as
Air temperature or
Resultant temperature (Resultant = 1/2
Air temperature and 1/2 Mean Radiant temperature).
- Supply
air temperature — Used to compute the required air flow rate to
rooms, assuming a central all air system. The supply air temperature must be
below the room temperature.
- Include
losses with gains — When the
Include losses with gains option is
checked, any net heat loss at particular hours for rooms will offset some of
the coincident heat gain for other rooms at the same hour.
- Include
external shading — When the
Include external shading option is
checked, the calculation will check if each window is shaded by external
obstructions at each hour of the day. Shaded windows will receive diffuse solar
radiation only.
-
Include window fins — The
Include window fins option enables
consideration of window fins.
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Temperature rise
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If room temperatures are allowed to rise, the peak
sensible cooling load for the room will reduce.
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Fresh air loads
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A fresh air load can optionally be included in the
load calculation. Fresh air will be supplied to all included rooms using one of
the following criteria:
- Air change rate
- Fresh air
requirement per person
- Fresh air
requirement per square metre
For all included rooms, and for each hour of the
design day,
Fresh air introduced locally to rooms
affects the room load.
Fresh air from the central plant with conditioned
air also affects the room load. Conditioned primary air is supplied
at the defined Supply temperature, with optional supply Humidity control.
Conditioned primary air affects both room
loads and central plant loads.
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Fixed temperature air
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When
Include fixed temperature air
to rooms is checked, the calculation is performed
assuming a potentially infinite supply of heating or cooling air at 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.
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Outside conditions
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Used to vary the maximum outside dry and wet bulb
temperatures experienced on the design day by selecting data based on the
weather profile being used for the project. Click
Re-calculate all to repeat the calculation
with the new temperature data selected.
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