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
  • 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
  • H05K7/20663—Liquid coolant with phase change, e.g. heat pipes
  • H05K7/20681—Liquid coolant with phase change, e.g. heat pipes within cabinets for removing heat from sub-racks
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B49/00—Arrangement or mounting of control or safety devices
  • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
  • F25B49/025—Motor control arrangements
• • 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
  • H02B1/565—Cooling; Ventilation for cabinets
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B2600/00—Control issues
  • F25B2600/02—Compressor control
  • F25B2600/025—Compressor control by controlling speed
  • F25B2600/0253—Compressor control by controlling speed with variable speed
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B2600/00—Control issues
  • F25B2600/11—Fan speed control
  • F25B2600/111—Fan speed control of condenser fans
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
  • F25B2700/21—Temperatures
  • F25B2700/2104—Temperatures of an indoor room or compartment
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
  • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

• Cooling device for a control cabinet
• the invention relates to a cooling device for a control cabinet with a refrigeration circuit, which has a compressor, an evaporator and a condenser, the evaporator being associated with an evaporator fan and the condenser with a condenser fan, the evaporator fan supplying the air in the control cabinet to the evaporator and the condenser fan supplies ambient air to the condenser, and the compressor conveys the cooling medium held in the refrigeration cycle.
• Such cooling devices are widely known. For example, they are designed as control cabinet add-ons and can be attached, installed or installed on a control cabinet.
• the evaporator of the cooling unit is spatially connected to the interior of the control cabinet via an air duct.
• the air is fed from the interior of the control cabinet to the evaporator, cooled here and then returned to the interior of the control cabinet. If the temperature level in the interior of the control cabinet falls below a predetermined value, the cooling unit is switched off. If a specified temperature is exceeded, the cooling unit switches on again and the cooling process starts again.
• the cooling device is always operated in full load in cooling mode.
• the air conditioners which are used in temperate temperature zones, for example, are designed for summer operation. This means that sufficient heat must be dissipated from the cabinet interior at high ambient temperatures. If the cooling device is operated in the other seasons, the cooling device is switched on and off frequently. These switching operations shorten the life of the cooling device.
• Control cabinets are often operated in rooms where staff are also present. It is therefore desirable that the cooling device emits little noise. Since the cooling units are operated at full load in cooling mode, a maximum noise level is always reached. This noise level is reduced with the help of complex sound insulation measures.
• the compressor is connected to a control unit via a signaling path, that the control unit is assigned a temperature sensor which is arranged in the area of the interior of the control cabinet, and that the control unit has a control circuit which controls the delivery rate of the compressor, which differs from zero, as a function of the temperature measured at the temperature sensor via the signaling path.
• the compressor In an operating state (for example in winter operation) in which only small amounts of heat are to be dissipated from the interior of the control cabinet, the compressor is controlled in such a way that only a small amount of cooling medium is circulated through the refrigeration circuit. Accordingly, the cooling capacity of the cooling device is low. In this operating state, the compressor has a low power consumption, so that energy-saving work can be carried out.
• the compressor can be regulated in such a way that it is operated continuously. Accordingly, there are no wear-intensive switch-on and switch-off processes, so that a maximum service life of the cooling device is guaranteed.
• the compressor has a maximum and a minimum delivery rate, that these delivery rates are assigned an upper and a lower cooling capacity limit, and that the control circuit regulates the compressor between the two cooling capacity limits continuously or in predetermined switching stages.
• Adjust control cabinet interior This is particularly advantageous if sensitive internals are installed in the control cabinet interior that cannot be subjected to large temperature fluctuations. If a variant with predefined switching stages is implemented, the switching stages can be narrowed accordingly, so that permanent compressor operation can be ensured at least over wide ranges.
• control circuit regulates the compressor between the two cooling power limits along a control straight line with a constant gradient.
• control unit is connected to the condenser fan via a signaling path and that the speed of the condenser fan can be controlled by means of a control circuit of the control unit as a function of the temperature in the interior of the control cabinet.
• evaporator fan is also connected to the control unit via a signaling path and that the speed of the evaporator fan can be controlled by means of a control circuit of the control unit as a function of the temperature in the interior of the control cabinet.
• the fan speeds can be varied depending on the required cooling capacity.
• the speed variation can again be stepped or infinitely variable.
• the variation of the speed is particularly important in industrial operation or in the operation of a control cabinet in an office.
• the sound pressure level can be significantly reduced, so that user-friendly operation is possible. Since only low speeds have to be driven at low cooling capacities, there is a low air volume flow.
• the condenser fan this has the advantage that the air flow that exchanges the ambient air does not cause strong air turbulence, which ultimately has a decisive influence on the dust pollution in a room.
• the evaporator fan can preferably be regulated independently of the condenser fan, so that the refrigeration cycle can be regulated in an optimized manner.
• the signaling paths between the control unit and the compressor and / or the evaporator and / or the condenser can be wired or wireless.
• the control unit can be accommodated separately from the cooling device. Then, in particular, it is also easily possible to control several different cooling devices which are assigned to the individual control cabinets with a single control unit.
• the cooling device has a refrigeration cycle with a condenser 10, an evaporator 12 and a compressor 1 1.
• a condenser fan 13 and an evaporator fan 14 are assigned to the condenser 10 and the evaporator 12.
• the compressor 1 1, the condenser fan 13 and the evaporator fan 1 are connected to a control unit 15 via signaling paths 1 1 .1, 13.1 and 14.1.
• the control unit 15 has a temperature sensor 16. This temperature sensor 16 can be arranged in the interior of a control cabinet.
• temperature sensor 16 permanently measures the temperature in the interior of the control cabinet. This measured temperature is transmitted to a control circuit of the control unit 15. Depending on the measured temperature level, the control unit 15 either controls optionally or together the compressor 1 1, the condenser fan 13 and the evaporator fan 14 via the signaling paths 1 1 .1, 13.1 and 14.1. The compressor is controlled to vary the speed of its compressor wheel. If a high temperature level is measured in the control cabinet interior, the speed of the compressor 11 is high, so that a correspondingly large delivery rate of a cooling medium is pumped through the refrigeration cycle. The condenser fan 13 and the evaporator fan 14 are also controlled to a speed variation.
• the speeds are selected to be high for large amounts of heat to be dissipated, and correspondingly lower speeds are required for small amounts of heat.
• the compressor 1 1, the condenser fan 13 and the evaporator fan 14 can be controlled independently of one another by the control unit 15. This allows the cooling device to be operated optimally.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Power Engineering (AREA)
• Aviation & Aerospace Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Cooling Or The Like Of Electrical Apparatus (AREA)

Priority Applications (2)

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Publications (1)

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Cited By (2)

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Citations (3)

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• 2000
  • 2000-03-17 DE DE10013039A patent/DE10013039A1/de not_active Ceased
• 2001
  • 2001-03-15 WO PCT/EP2001/002927 patent/WO2001069997A1/de not_active Application Discontinuation
  • 2001-03-15 JP JP2001566612A patent/JP2003526934A/ja active Pending
  • 2001-03-15 EP EP01915344A patent/EP1269810A1/de not_active Withdrawn
  • 2001-03-15 CN CN01805832A patent/CN1406456A/zh active Pending

Patent Citations (3)

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