Classifications

• • 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
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
  • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
  • F25D17/042—Air treating means within refrigerated spaces
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
  • A47F3/00—Show cases or show cabinets
  • A47F3/001—Devices for lighting, humidifying, heating, ventilation

Definitions

• the invention relates to methods and a device for performing the method for air conditioning a showcase for displaying objects with an interior that is more or less hermetically sealed from the outside world, the objects finding their place on a support surface and by completely or partially enclosing the interior Glass panes of the side surfaces are visible from the outside.
• Such a display case is already known.
• the patent specification DE 38 05 212 C2 describes an air-conditioned display case for storing and / or displaying objects, in which the air losses which emerge from the interior through leaks between the interior and the outside environment due to the introduction of air or gases from the outside be balanced again.
• the air or gas supplied is filtered and kept at a predetermined temperature. So that no harmful substances can penetrate from the outside due to the leakage of the interior, there is a slight overpressure in the interior.
• the air or gas introduced from the outside is conveyed into the interior with a pump, and the air humidity can also be set to a predetermined value with the aid of a cooling device.
• the air humidity is monitored with the help of a hygrostat, which controls the cooling device. Further measures for monitoring and maintaining the air humidity in the interior of the known display case cannot be found in the cited document.
• the object of the invention is to provide a method and a device for carrying out the method for air conditioning the interior of a display case, which requires little effort and has low power consumption.
• This object is achieved in that the air in the interior is passed through an exchanger and cooled in this way and the exchanger is closely connected with a cooling device with regard to the temperature transition, the exchanger being operated such that the difference between the higher temperature the air of the interior and the lower temperature of the exchanger is constantly kept at a value which is below the dew point of the air of the interior.
• a display case has an upper part 1, which rests on a base 2.
• the upper part 1 consists, for example, of four side parts 3, of which at least three are designed as glass panes.
• the upper side part 16 can also consist of a glass pane, but it is also conceivable that a box-shaped upper part is provided instead of a glass pane, which covers the upper part 1 upwards and can contain a lighting device or other devices, not shown.
• the glass panes can be simple glass panes or (multiple) insulating glass panes.
• the interior 4 enclosed by the side parts 3 and 16 is also accessible from the outside in a known manner, this serves to display objects which rest on a support surface 5 which, for example, forms the bottom of the interior 3 enclosed by the side surfaces 3 and 16. There may also be further support surfaces, not shown, for the placement of further objects within the interior 4.
• the interior 4 is closed airtight or almost airtight from the surroundings of the display case by appropriate means, not shown.
• the air 6 in the interior 4 is sucked in by a fan 9 and pressed through an exchanger 8, in which the same is cooled, the cooled air 7 is then returned to the interior 4.
• the exchanger 8 consists of a plate with a large number of fins, past which the air to be cooled is passed, the plate and fins being made of a thermally highly conductive metal, for example aluminum or copper.
• the plate is in close connection with a cooling device 10 in terms of heat transfer.
• the cooling device 10 acts it is a known cooling unit, that is to say a compressor 11 and a cooling coil in which there is a cooling liquid which expands when heated and releases cold again when compressed by the compressor.
• This cooling coil can be located, for example, in a tightly closed container which is completely filled with water or another suitable liquid and is in thermally close connection with the plate of the exchanger 8.
• the water is not only a transmission medium for the cold generated by the cooling device 10 to the exchanger 8, it is also, so to speak, a cold store, which also serves to save energy.
• the cooling device 10 is designed in this case as a closed system, with an expansion tank ensuring that close contact between the water of the cooling device 10 and the exchanger 8 is always ensured, regardless of the respective temperature of the water.
• Another embodiment of the cooling device 10 can consist of a solid metal block made of aluminum or copper, the cooling coil being passed through the metal block one or more times.
• the metal block is also in a close thermal connection with the plate of the exchanger 8, the metal block itself also being able to assume the function of the cold store, depending on the size. If a heating coil is provided in the exchanger 8, heating of the air is also possible. In this case, the compressor 11 must be controlled as a function of the signals from the second temperature sensor 13 so that the air 7 leaving the exchanger 8 corresponds to the desired value of the temperature.
• first thermal switch (not shown) which closes an electrical contact as soon as a predetermined temperature, for example 18 degrees, is reached.
• a second thermal switch is attached to the exchanger 8, preferably on the plate thereof, which closes an electrical contact as soon as the temperature has dropped to a predetermined value, for example to 8 degrees.
• the compressor 11 is switched on with the first thermal switch and the compressor 11 is switched off with the second thermal switch.
• the difference between the higher temperature of the air in the interior 4 and the lower temperature of the exchanger 8 can be kept at a value which is below the dew point of the air in the interior 4 of the showcase by appropriate selection of the temperature limit values to which the two thermal switches respond lies.
• thermosensor 12 instead of the first thermal switch and a temperature sensor 13 instead of the second thermal switch, each of which convert temperature values into electrical values and pass them on to an electronic control device 14 connected to the latter, which in turn is connected to the compressor 11.
• the control device 14 evaluates the respective temperature values and initiates the control of the compressor 11 in the manner already described. It has previously been assumed that the fan 9 constantly circulates the air through the exchanger 8 at a constant power. It is possible to influence the drive motor of the fan 9 by the control device 14 in such a way that the air circulation quantity is changed according to predetermined values depending on the respective temperature values, as is already the case with the compressor 11.
• a third temperature sensor 15 which is attached outside the showcase and reports the temperature values of the surroundings of the showcase to the control device 14, an optimal control of the climate in the interior 4 of the showcase can be achieved.
• the control device 14 is to be programmed accordingly in accordance with the functions already described, in that the compressor 11 and the fan 9 are controlled as a function of the temperature values of the sensors 12, 13 and 15 concerned.
• dew point sensors can also be installed in the display case, which are also connected to the control device 14 and whose signals complement or expand the function of the control device 14.
• the control device 14 can also be provided in duplicate, one control device being constantly active and the second control device being effective only if the first control device fails.
• the devices described can be designed as a compact, interchangeable unit and can preferably be accommodated below the support surface 5 forming the base, that is to say in the base 2 of the showcase.
• the support surface 5 can not quite up to two Reach opposite side surfaces 3, whereby through the resulting slot the air 6 is sucked out of the interior 4 by the fan 9 and after passing through the exchanger 8 the air 7 gets back into the interior 4 through the second slot if the air movement is not caused by special ones Openings.
• the invention is not only limited to this known way of generating cold, but the necessary cold can also be generated in other ways, for example by using Peltier elements.
• the structure of the exchanger 8 can also change if it is mounted together with the Peltier elements not on the support surface 5 but on one of the side surfaces 3.
• the control device 14 in such a way that the level of the voltage supplied to the Peltier elements automatically depends on the signals from the temperature sensors is regulated. This allows the surface temperature of the exchanger 8 to be regulated particularly precisely, as a result of which the temperature of the air in the interior 4 can also be set precisely within the slightest temperature fluctuations.
• the exchanger 8 can also be designed in such a way that the amount of air supplied to and / or discharged from it can be regulated. This control function can also be taken over by the control device 14 if the corresponding control device for the air quantity is connected to the control device 14 and receives its control signals in the manner described as a function of the signals from the sensors from the control device 14. List of reference numbers

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Freezers Or Refrigerated Showcases (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7687954

Family Applications (1)

Country Status (7)

Cited By (2)

Families Citing this family (1)

Citations (3)

Family Cites Families (7)

• 2001
  • 2001-06-13 DE DE2001128348 patent/DE10128348B4/de not_active Revoked
• 2002
  • 2002-06-12 DK DK02764584T patent/DK1399047T3/da active
  • 2002-06-12 WO PCT/EP2002/006426 patent/WO2002100218A1/de not_active Ceased
  • 2002-06-12 ES ES02764584T patent/ES2278953T3/es not_active Expired - Lifetime
  • 2002-06-12 AU AU2002328811A patent/AU2002328811B2/en not_active Ceased
  • 2002-06-12 JP JP2003503048A patent/JP2004528142A/ja not_active Withdrawn
  • 2002-06-12 DE DE50209294T patent/DE50209294D1/de not_active Expired - Lifetime
  • 2002-06-12 EP EP02764584A patent/EP1399047B1/de not_active Revoked
• 2009
  • 2009-02-04 JP JP2009024106A patent/JP2009162479A/ja active Pending

Patent Citations (4)

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