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Outdoor-type Communication Facility Cabinetwith Attemperation Function– Smart Cabinet –1.

INTRODUCTION

Furukawa Electric (FEC) launched the Smart Cabinet collectively developed with NEXCO-East Engineering
Company Limited ,which can simultaneously accommodate indoor-type communication equipments and ability
to support the building of an out-door type communication station. The Smart Cabinet can house equipments,
such as optical-metal internet protocol (IP) transmission
equipment, server and power source/Uninterruptible Power
Supply (UPS), etc. up to 320 W of total maximum heat generation. The inside cabinet temperature can be maintainedin the range of 0 to 40°C with an ambient outdoor temperature between -15 to 45°C in summer with direct sunlightand high temperature, as well as in winter in cold districts.

2.

ABOUT OUTDOOR-TYPE CABINET FORCOMMUNICATION FACILITIESDue to changes in road communication network path to IPetc., there is a growing demand for outdoor-type cabinet
for high performance communication equipments, which
can house indoor communication equipments simultaneously and build outdoor-type communication station.
Many precision type equipments, such as uninterruptible
power supply (UPS) and modem are housed in the communication cabinet. But these precision type equipments
can malfunction due to inside cabinet temperature fluctuation created from the heat generated by the equipment
itself or from the change in external ambient environment
such as temperature rise by solar radiation in summer andtemperature drop in winter. To prevent these problem, aninside temperature control system with an air conditioner
etc. is required. But the latter with a conventional mechanical type cooler and compressor has complex mechanicalparts that can be a source of problems in terms of weightand price. Furthermore, in the air polluted environment on
the roads, reliability is often an issue because of theincrease in maintenance frequency due to break down of
mechanical parts. Also another problem of higher environmental concern is expected by the use of refrigerant. In
this framework, FEC developed the new outdoor-typecommunication equipments cabinet based on new designconcept, and solving the problem of the conventional outdoor-type cabinet.

3.

PRODUCT CONCEPTThe product concept of the Smart Cabinet is to reduce
the power consumption and to provide conditions whereindoor equipments can be used outdoor. Here, technicalstudies are conducted to address the following 4 concerns from a view point of solving problems of conventional cabinets.
A) Light weight and compact B) Energy saving C)
Environment friendly D) Reliability improvement “Lightweight and compact” was achieved by adopting a heatexchanger with a Peltier device, which is a semi conductor type cooler. The operating method based on, switching two types of heat exchangers mounted on the cabinet, saves energy. From an environmental friendliness,the heat exchanger with Peltier device which does notuse cooling medium such as Freon is adopted and theoperation method is optimized. Also reducing moving
parts improves reliability.

4.

BASIC SPECIFICATION OF THE SMART
CABINETInternal temperature of the cabinet cannot be cooled totemperature lower than outside air, only by an air-cooledheat exchanger, especially in summer. Therefore theSmart Cabinet uses heat exchanger with Peltier device onthe back side, in addition to the air to air heat exchanger
on the top of the cabinet as shown in Figure 1.
A heat exchanger with a Peltier device adopts thermoelectric conversion elements made of Bismuth Tellurium.
The heat transfer from the heat absorption part to the heatdissipation part occurs by applying direct current, and theheat absorption part temperature can be lowered than theheat dissipation part by removing the heat from the heatdissipation part. In addition, the Crimped fin heat sink
which has excellent heat dissipation performance isapplied to the high temperature side of the heat exchanger with the Peltier device. Then the heat from the heatexchanger with the Peltier device can be dissipated efficiently. The Crimped fin heat sink is an environment
friendly heat sink because it consists of fin materials
crimped to the grooves provided in the base plate since
solder and brazing materials are not used for jointing ofparts.
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201336

Outdoor-type Communication Facility Cabinet with Attemperation Function – Smart Cabinet–

Temperature inside the cabinet is controlled by switching the air to air heat exchanger on the top of the cabinet
and the heat exchanger with the Peltier device on the backside, as shown in Figure 2. The heat exchanger with thePeltier device can exchange heat dissipation side andheat absorption side by current flow direction, and theSmart Cabinet performs cooler operation and heater operation by switching the current direction in the controller.

Air cooled heat exchanger
installed on cabinet top panel

Heat exchanger
with Peltier device

High heat radiation
between inner and outerboard is achieved bylaminate structure grid fin.

Small size, light weight andhigh performance devicesare achieved by highperformance Crimped fin.

Heat radiation capacity
ΔT≒10℃ at 320 W

Cooling capacity
ΔT≒-10℃ at 320 W

Outside board

Outside board

Outside board

Inside board

Air cooled heat exchanger
installed on cabinet top panel

Heat exchanger
with Pertier device【Appearance】【Inside】

Figure 1 Configuration of the Smart Cabinet.

The operation mode is automatically controlled,
based on the external ambient environment and the cabinet inside temperature.
−15℃

35℃

0℃
Peltier OFF
Air cooled heat exchanger installedon cabinet top panel ON

Peltier
Heater ON45℃Peltier
Heater ON【Cabinet inside heating】【Cabinet inside cooling】【Cabinet inside cooling】
Warm wind mode
Cool wind mode by outside temperature Forced cold wind mode
Heatexhaust

Heating
Warm wind

Heat exchanger
with Peltier device

Heat exchanger
with Peltier device

Cold air
Air within
cabinetOutsideair

Air cooled heatexchanger installedon cabinet top panel

Air cooled heatexchanger installedon cabinet top panel

Hot air

Cabinet inside
air circulation

Heat exchanger
with Peltier device

Air cooled heatexchanger installedon cabinet top panel

HeatexhaustHot air

Heat absorption
Cold airFigure 3 shows typical results of out door test in summer.
The result verifies that inside cabinet average temperature can be maintained at 35°C by the Peltier cooler ON,
within the range of 320 W of load in an extremely hot
under the scorching sun (ambient temperature 34°C).

Temperature【℃】

Figure 2 Smart Cabinet operation methods.

40353025
2015
10Peltier operating
Load 320 W
Sept.1st, 2010

0:00

3:00

Inside Cabinet temperature
Ambient temperature

6:00

9:00

12:00

15:00

18:00

21:00

TimeFigure 3 Smart Cabinet outdoor summer season verification
test result.

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Outdoor-type Communication Facility Cabinet with Attemperation Function – Smart Cabinet–

5.

THE SMART CABINET PRODUCTLINEUP

The Smart Cabinet has two types of products depends on
total heat generation by accommodated equipments.
Though, outdoor test verified that inside cabinet average temperature can be controlled to 35°C in extremely
hot days under the scorching sun, the specified insidecabinet controlled temperature is 0 to 40°C.

Table 2Cabinet outside dimension(mm)

W 610 × D 762 × H 900

Equipment installation

19 inch rack specification

Max. heat from selectedequipments

Up to 230 W in total

Cabinet inside controlledtemperature

0 to 40°C(Ambient temperature -15 to 45°C)

Max. power consumptionLess than 450 VA

Input power source

AC single-phase two-wire system
85 to 240 V (50, 60 HZ)

5.1 The Smart Cabinet L
The type L can accommodate heat generating equipments up to 320 W in total, and is basically a freestanding
installation. Also, the heat exchanger with the Peltier
device is installed on the back of the cabinet, and is a one
side door system.
5.2 Smart Cabinet M
The type M can accommodate heat generating equipments up to 230 W in total and, a freestanding installation
and a pole-mounted installation are available. Two sides
door system is adopted, and selected equipments can be
maintained both from front and rear side.

Main specifications of The Smart cabinet M.

InsideTwo sides door appearance

Figure 5 Appearance of Smart Cabinet M.
Table 1Main specifications of The Smart Cabinet L.

Cabinet outside dimension(mm)

W 667 × D 839 × H 1,294Equipment installation

19 inch rack specification

Max. heat from selected
equipments

Up to 320 W in total

Cabinet inside controlledtemperature

0 to 40°C(Ambient temperature -15 to 45°C)

Max. power consumptionLess than 1100 VA

Input power source

AC single-phase two-wire system,
85 to 240 V (50, 60 HZ)

Front appearance

For more information please contact:
Thermal Electronics Device DivisionMarketing Engineering Department
TEL: +81-3-3286-3025 FAX: +81-3-3286-3183

InsideFigure 4 Appearance of The Smart Cabinet L.

Furukawa Review, No. 43201338