The amount of heat in a pigeon transporter mainly consists of the metabolism of the pigeons, and to a lesser degree of solar heat, even if the transporter has been parked in the sun at an outside temperature of 35"C. Because of this amount of heat, the temperature in the transporter without ventilation will rise very fast. By switching on a properly working ventilation system, the temperature in the transporter will be controllable.
Fresh air is sucked in at the front at the top of the right side wall by
means of a suction fan which is mounted against the head partition in a sound insulating casing. Grids with moisture barriers prevent moist air from entering into the ventilation system. Fresh air is blown through a channel against the head partition in the floor channel, this then goes through the transporter along its full length.
Near every inner post a branch valve is placed that blows the air into a vertical channel. This vertical channel is closed at the gangway side and goes through to the roof of the transporter. The air is blown on three sides through a perforated plate and
mixes with the hot air in the boxes, as a result of this construction, the outlet velocity of the air is very low so that the out-flowing air quickly mixes with the ambient air and no draught will be experienced by the pigeons. The heated and polluted air will be extracted through a channel that has been mounted above the gangway against the roof.
Near every compartment an adjustable exhaust opening has been mounted in this exhaust channel to expel the polluted air. The exhaust fan has been mounted at the right backside of the transporter. This one is equal to the suction fan as far as the design and the capacity are concerned. In the gangway, thermostats have been mounted so that if the set temperature is exceeded, they will switch on the ventilation system. So if one of the thermostats is switched on, the ventilation system will start.
The operation of the ventilation system is carried out by means of a three-position switch: O = off; 1 = ventilation is continuously working; 2 = ventilation through thermostat control. The ventilation system can either be fed by a generator set, or by traction accumulator (batteries). Because of such a properly working system, which distributes the air evenly through the entire transporter, the temperature can be reduced to plus or minus 3oC above the current outside temperature, as a result of this, a controllable ventilation will be obtained under nearly all conditions.
Controllability will be achieved because the thermostats drive the system and enable the doors to be closed when parked. Only then can the ventilation system be adjusted properly and false draughts are prevented. By using such a system, the climate can be
guaranteed during the entire transporting and the pigeons will be conveyed to the liberation site in optimal circumstances without any risk of problems arising.
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