|7.2.3 Components of an integral refrigerated container|
|Figure 12 shows the front end of a Carrier Transicold 69NT refrigeration unit. In this instance, all the inspection flaps have been opened. Two circulating fans can clearly be seen towards the top. These force the air through the air cooler below. Single-phase fan motors are mainly used nowadays, to prevent the direction of rotation from changing in the event of the phases in the three-phase power supply being reversed. These motors usually support two rotation speeds, allowing a high speed to be used at high temperatures (above -10°C) and a lower speed for freezing temperatures below -10°C.
The expansion valve is attached to the air cooler and accessible through the middle inspection flap.
The condenser of the cold circuit is positioned behind the blue cross bar beneath the condenser fan. The condenser fan sucks air over the coolant compressor through the condenser.
The circulation fans and the air cooler can be seen clearly again in the rear view (Figure 13).
The electric heaters used to heat the container and to defrost the air cooler are also positioned in the air cooler. The drip tray below the air cooler is also electrically heated.
The side view shows the connections for USDA temperature sensors used to measure the temperature of the goods. These temperature sensors are mandatory by the USDA as a proof of insect extermination.
In the event of the container being connected to an on-board water-cooling system, the cooling circuit can be optionally equipped with a water-cooled condenser, as shown in Figure 14.
First, the coolant flows through the air-cooled condenser, but the condenser fan will not operate if water pressure is detected.
Figure 15 shows the cooling water connections to a water-cooled condenser. These couplings are described in ISO 1496-2, but some banana shipping companies use other couplings.
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