52 User Manual
DOL 534 • DOL 539
DOL 53X’s calculation of the degree of cooling in ºC which an animal of a given age
and breed will experience.
Menu for status of air intake, MultiStep and Dynamic MultiStep.
3.9.1 Cycle Timer at Tunnel Ventilation
When tunnel ventilating at low ventilation requirement (e.g. below 0.8 m/s), the distribution of air in the house
can be ensured by means of a cycle timer. DOL 53X will alternately switch the fans on and off. This will
prevent temperature differences.
Example 17: Ventilation sequence with cycle timer at tunnel ventilation
Air speed requirement m/s
When a cycle timer is used at tunnel ventilation, the air speed will cycle between 0.0 and 0.8 m/s. As always the setting
of Min. air speed will function as a start condition for tunnel, but now with the possibility of starting at a lower setting,
e.g. 0.2 m/s.
3.9.2 Minimum and Maximum Air Speeds
If the speed is too low, the temperature difference between the two ends of the house will be too high.
Therefore, you must set a lower limit for the air speed in tunnel mode.
In order to prevent small animals from being ventilated too much, it is possible to set an upper limit for the air
speed in the house, Max. air speed.
3.9.3 Chill Factor and Chill Effect
The chill factor is an expression of the cooling effect of the air, depending on the age and breed of the animals.
The younger the animals, the colder they feel the temperature at a given air speed.
DOL 53X calculates the current cooling effect on the basis of the air speed in the house and the current chill
factor.
Example 18: Chill factor and chill effect
Side Tunnel with cycle timer
Tunnel without cycle timer
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