TP48120A-HD15A1, TP48120A-HD15A2,
TP48200A-HD15A1, and TP48200A-HD15A2 Telecom
Power
User Manual
Copyright © Huawei Technologies Co., Ltd.
3.5 TCU
3.5.1 Heat Exchanger
The equipment compartment cools equipment in heat exchanging mode, in which heat is
exchanged through internal circulation and external circulation.
Internal circulation: hot air in the equipment compartment is drawn by the fan assembly into
the heat exchanger, passes through the heat exchanging core from top to bottom, then releases
heat to change to cold air, and finally returns to the equipment room through the internal air
exhaust vent under the heat exchanger.
External circulation: natural air is drawn by the fan under the heat exchanger into the heat
exchanger, passes through the heat exchanging core from bottom to top, then absorbs heat to
change to hot air, and finally flows out of the cabinet through the external air exhaust vent of
the heat exchanger.
Figure 3-10 shows the heater exchanger working principles.
Figure 3-10 Heater exchanger working principles
3.5.2 Direct Ventilation
Both the TP48120A-HD15A1 and TP48200A-HD15A1 use direct ventilation for cooling the
battery compartment. Air outside the cabinet enters the battery compartment through the air
intake vent at the bottom of the compartment. The external fan under the heat exchanger
draws air from the battery compartment to accelerate the air flow from the air intake vent of
the battery compartment to the air intake vent of the fan, keeping the operating temperature
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