Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K7/00—Constructional details common to different types of electric apparatus
  • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K7/00—Constructional details common to different types of electric apparatus
  • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
  • H05K7/20536—Modifications to facilitate cooling, ventilating, or heating for racks or cabinets of standardised dimensions, e.g. electronic racks for aircraft or telecommunication equipment
  • H05K7/20609—Air circulating in closed loop within cabinets wherein heat is removed through air-to-liquid heat-exchanger
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
  • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
  • H02B1/56—Cooling; Ventilation
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K7/00—Constructional details common to different types of electric apparatus
  • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
  • H05K7/20536—Modifications to facilitate cooling, ventilating, or heating for racks or cabinets of standardised dimensions, e.g. electronic racks for aircraft or telecommunication equipment
  • H05K7/207—Thermal management, e.g. cabinet temperature control

Definitions

• the invention relates to a method for controlling a mounted in or on a cabinet cooling device by means of a control device, in which the temperature of the cabinet interior air is detected and one of these associated indoor fan for generating an indoor air flow is turned on by an evaporator and providing cooling air, if the detected temperature of the cabinet internal air exceeds an upper preset temperature, and is turned off when the detected temperature falls below a lower preset temperature, and to an apparatus for performing the method.
• a temperature sensor which measures the sucked warm air inside the control cabinet.
• a refrigeration circuit with a fluid refrigerant and an outside air circuit are switched on or off.
• the heat energy of the inside of the cabinet is taken up by the refrigerant of the refrigeration circuit in an evaporator.
• the refrigerant is then highly compressed by a compressor, thereby reaching a higher temperature level in a condenser than the ambient air. Thereby, the heat energy transported in the refrigerant can be discharged to the outside air circuit which is driven by an outdoor fan.
• the cooling unit In order to control the internal temperature of the control cabinet or the interior of the control cabinet, the cooling unit is put into operation only intermittently, the compressor and the external fan being switched on and off at intervals depending on the temperature via a device-internal control device.
• the interior of the enclosure is guided by means of the internal fan via a temperature senor, whereby the operation of the inside fan contributes significantly to the energy consumption.
• a time taking is started and the inner fan after a predetermined first period of time for a predetermined second time period is turned on and then turned off again when the upper Vorgabetemperatur of the detected temperature is exceeded, as long as the second period is running, that the intermittent timed operation of the indoor fan is cyclically repeated until the upper preset temperature is exceeded, after which the indoor fan is operated in continuous operation, and that the timing and the intermittent timed operation of the indoor fan restarted when the lower presetting temperature is fallen below again.
• a time control unit is provided, by means of which a time taking is triggered when the detected temperature falls below the lower preset temperature or the indoor fan is turned off, and a time-controlled operation with the involvement of the indoor fan after a first period of time for a second Duration takes place as long as the upper preset temperature is not exceeded.
• the measures contribute to the fact that a compressor and an outdoor fan of the refrigerator remain switched on during the intermittent time-controlled mode of operation, as long as their activation is specified via the control device.
• An advantageous embodiment of the device is that the time-controlled mode of operation in the time control unit is predetermined by a program.
• FIG. 1 shows a schematic representation of a control cabinet with a cooling unit attached thereto and air flow relationships present
• Fig. 2 shows an example of an operation of a réelleicenters
• Fig. 3 is a preferred embodiment of the present invention for an operation of the indoor fan.
• Fig. 1 shows a schematic view of a control cabinet 1 with a mounted on the rear wall cooling device 2.
• mounting components 3 are mounted on a mounting plate 4, generate the heat loss and cooled by the cooling device 2 via a mecanicopathyikaiauf I.
• an interior fan 23 is in a first subspace brought into flow communication with the cabinet interior via flow openings upper portion of the subspace and downstream of the same an evaporator 21 is arranged.
• the cooling device 2 comprises a regulating device 22, a time control unit 22.1 and a temperature sensor 24 arranged in the first subspace near the inner ventilator 23 for detecting the temperature T1 of the inside of the switching cabinet flowing from the inside of the switching cabinet into the first subspace.
• a refrigeration cycle for a fluid refrigerant is formed and an outside air circuit A, in which via a arranged in a second subspace of the refrigerator 2 in the lower region of the outdoor fan 25 outside air via outside air openings and discharged after flowing through a condenser 26 to the outside again becomes.
• the refrigeration cycle for the refrigerant includes the evaporator 21, in which the heat energy of the cabinet inner air is taken up by the refrigerant flowing through it, and a compressor 27, present in the lower portion of the second compartment, through which the refrigerant is strongly compressed, whereby it in the Furthermore, in the refrigeration circuit condenser 26 reaches a higher temperature level than the ambient air. As a result, the heat energy transported in the refrigerant from the cabinet interior is discharged to the outside air circuit A, which is driven by the outdoor fan 25.
• the kite circuit and the outside air circuit A are switched on or off in order to comply with temperature limits in the control cabinet.
• the control device 22 of the cooling device 2 via which the temperature-dependent connection and disconnection of the compressor 27 and the external fan 25 is carried out.
• an accurate temperature measurement of the internal cabinet air is required. This is done via the temperature sensor 24.
• the air flow in the cabinet interior can still be supported by device fan 31 of the built-in components 3.
• device fan 31 of the built-in components 3 In the idle state of the interior fan 23, an inaccurate temperature measurement of the air temperature present in the area of the installation components 3 to be cooled can result in the region of the temperature sensor 24 as a result of poor air mixing.
• FIG. 2 shows an exemplary embodiment in which the interior fan 23 is switched on and off in a temperature-controlled manner.
• the interior fan operating state A1 over the time t is shown in the upper partial image and the course of the inside air temperature T1 over the time t.
• T2 eg -5 ° C.
• the inside fan is in the switched-on state and is only switched off when the inside air temperature Tl is below a lower setpoint temperature T1 ⁇ below the upper preset temperature T1 ⁇ z. B. -10 ° C
• the inside air temperature Tl rises again when the cooling device 2 is in an idle state and exceeds the upper preset temperature T2, then the inside fan 23 is switched on again and the cooling bed is also activated.
• the middle illustration in Fig. 2 shows the operation of the mecaniciesters 23 in dependence on the detected temperature. Accordingly, the interior fan 23 is excluded from the switched to the on state, when the detected temperature Tl the upper preset temperature T2 corresponds and brought from the switched to the off state, when the detected temperature Tl below the lower preset temperature T1.
• the operation of the compressor 27 and the outdoor fan 25 is shown as a function of the internal temperature of the cabinet.
• a hysteresis is provided, wherein the compressor 27 and the outdoor fan 25 are brought from the off state to the on state when a higher temperature (above the upper preset temperature T2) is reached, and from the on state to the off state Condition when a lower temperature, in this case z. B. below the upper preset temperature T2 and above the lower preset temperature T1 is reached.
• the temperature regulation of the inside air temperature of the control cabinet is subject to uncertainties, in particular in the area of the installation components. It could be thought to control the indoor fan 23 by means of temperature signals, the temperature from another temperature sensor z. B. is arranged in the vicinity of the installation component 3.
• a time-controlled mode of operation of the internal fan is superimposed on the temperature-controlled control mode, as shown in FIG. If the measured temperature Ti of the inside air falls below the lower presetting temperature T1 coming from a temperature which lies above the upper presetting temperature T2, then the inside fan 23 is switched from the switched-on state into the switched-off state. At the same time a timekeeping is set in motion and on Time signal provided by the time control unit 22.1. After a first time period t1 (of, for example, 15 minutes), the inside fan 23 is turned on for a second time t2 (of, for example, 1 minute).
• the internal fan 23 is not turned on temperature-controlled, but time-controlled for a third time period t3, which corresponds to the first time period t1, turned off again.
• the third time period t3 (of, for example, 15 minutes)
• the interior fan 23 is switched on again, as a result of which the now detected inside air temperature TI exceeds the upper preset temperature T2 and, as a result, the interior fan 23 remains switched on under temperature control.
• the switch-on state the inner fan 23 then keeps on until, again, the lower preset temperature T1 is exceeded. Then, the time-controlled operation starts again, starting the timing, as described above, until in turn the upper preset temperature T2 is exceeded.
• the cyclic intermittent operation of the inner fan 23 ensures reliable cooling operation, since in the region of the temperature sensor 24, the internal temperature of the control cabinet infoige of the timed operation of the inner fan 23 is detected relatively reliably. In this case, the reliability can be selected to be more or less high by adapting the first time duration t1 and the second time duration t2 of the cyclical operation to respective requirements.
• the time-controlled mode of operation is advantageously predetermined by a program, wherein the time control unit 22.1 is part of a microprocessor control or microcomputer. can be terscnies.
• the time-controlled operation of the interior fan 23 can be effected directly by the time control signal of the time control unit 22.1 or indirectly by this via other circuit components.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Aviation & Aerospace Engineering (AREA)
• Power Engineering (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Air Conditioning Control Device (AREA)
• Cooling Or The Like Of Electrical Apparatus (AREA)
• Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (9)

Cited By (3)

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Citations (8)

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• 2010
  • 2010-03-01 DE DE102010009776.4A patent/DE102010009776B4/de active Active
• 2011
  • 2011-02-09 US US13/261,402 patent/US10172259B2/en active Active
  • 2011-02-09 WO PCT/EP2011/051856 patent/WO2011107329A1/de not_active Ceased
  • 2011-02-09 IN IN6078DEN2012 patent/IN2012DN06078A/en unknown
  • 2011-02-09 ES ES11703861.2T patent/ES2526428T3/es active Active
  • 2011-02-09 SG SG2012059929A patent/SG183301A1/en unknown
  • 2011-02-09 CN CN201180012171.0A patent/CN102783262B/zh active Active
  • 2011-02-09 KR KR1020127025451A patent/KR101537439B1/ko not_active Expired - Fee Related
  • 2011-02-09 EP EP11703861.2A patent/EP2543241B1/de active Active

Patent Citations (8)

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