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
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B39/00—Evaporators; Condensers
  • F25B39/02—Evaporators
  • F25B39/022—Evaporators with plate-like or laminated elements
  • F25B39/024—Evaporators with plate-like or laminated elements with elements constructed in the shape of a hollow panel
• • 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
  • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
  • F25B2400/12—Inflammable refrigerants

Definitions

• the invention relates to a refrigeration device with at least one refrigeration space, which is cooled by an evaporator integrated in a closed refrigeration circuit and formed from a composite plate, which evaporator is produced with refrigerant channels produced by the rollbond or Z-bond method for guiding the refrigerant circuit from one Compressor driven refrigerant is equipped.
• Refrigeration devices with an evaporator according to the preamble of claim 1 are known for example from EP-A-0464711 or DE-A-4141641.
• their refrigeration cycle nowadays instead of the anti-ozone layer or the greenhouse effect-promoting refrigerant based on fluorine-chlorine-hydrocarbons CFC or fluorine-hydrocarbon HFC is a hydrocarbon-based refrigerant such as isubutane used.
• the use of such refrigerants in the known refrigeration circuits which are acted upon with a lower density than previously used refrigerants, leads to a significant increase in the volume of refrigerant flowing through them in their refrigerant channels per unit of time.
• the object of the invention is to design an evaporator formed from a composite plate in its hydrocarbon-based refrigerant with simple constructive measures in such a way that a loss of performance - due to the evaporator in the refrigeration system - is prevented.
• This object is achieved according to the invention in that a refrigerant based on hydrocarbons is used as the refrigerant, which is guided in refrigerant channels, the channel cross-section of which compared to that based on fluorocarbons or fluorochlorocarbons Refrigerants higher volume flow of the hydrocarbon-based refrigerants is largely adapted to avoid loss of performance in the refrigeration system and that the refrigerant flow sections provided next to the evaporator in the refrigeration circuit are essentially unchanged with regard to their flowable cross section serving to guide refrigerants based on fluorocarbons or fluorinated chlorinated hydrocarbons are.
• the solution according to the invention minimizes the pressure drop of the refrigerant flowing in the refrigerant channels of the evaporator between the evaporator inlet and the evaporator outlet, as a result of which the evaporation temperature of the refrigerant is almost uniform over the entire evaporator surface and thus the refrigeration capacity of the refrigerant compressor and the energy balance of the refrigeration circuit is significantly increased. It is also achieved by this solution that the channel lengths and the number of which can be largely unchanged compared to operation with refrigerants based on HFC or CFC, so that a narrower ducting, which is difficult to control in terms of production technology, is avoided over the entire evaporator board, which would significantly change its size. In addition, such enables the condensers or throttle sections in the refrigerant circuit which have been used in the case of CFCs or CFCs to be used without refrigeration changes for the operation of hydrocarbons-based refrigerants.
• the channel cross-sectional area of the refrigerant channels for guiding the hydrocarbon-based refrigerant is increased by 25 to 50% compared to the channel cross-sectional area of the refrigerant channels for guiding refrigerants based on HFC or CFC.
• a particularly high performance improvement with even more cost-effective production is achieved with an increase in the cross-sectional area of the duct if, according to a further advantageous embodiment of the subject of the invention, the increase in the cross-sectional area of the duct of the refrigerant ducts, which serve to guide the hydrocarbon-based refrigerant, is 50% the cross-sectional area of the refrigerant channels which is used to guide the refrigerant based on HFC or CFC.
• the channel cross-sectional area is between 17 mm 2 and 18.5 mm 2 , but is preferably 18 mm 2 .
• a refrigerant channel is particularly streamlined and, on the other hand, is still easy to manufacture if, according to a next advantageous embodiment of the object of the invention, it is provided that the channel cross-sectional area has a hydraulic equivalent diameter of approximately 3 mm, which is composed of a channel width of 12 mm and a channel height of 2.1 mm results.
• a refrigeration circuit 10 which is part of a household refrigerator with a *** freezer compartment and is not shown, is shown in simplified form and is equipped with a compressor 11. This is connected on the pressure side to a condenser 12, the tubing of which is adapted in terms of the flowable cross section to refrigerants based on fluorohydrocarbons or fluorochlorohydrocarbons.
• a condenser 12 On the output side of the condenser 12 is connected a dryer cartridge 13, the output of which is provided with a throttle tube 14, the flowable cross section is adapted to refrigerants formed on the basis of fluorocarbon or fluorochlorohydrocarbons.
• the throttle tube 14 is laid over the major part of its tube length within a suction tube 15 connected on the suction side to the compressor 11, which is connected together with the throttle tube 14 to an evaporator 16 designed for a so-called single-tube connection.
• This is made of circuit board-like material and has two temperature zones, which are supplied by a continuous refrigerant duct with refrigerants driven by the compressor 11 and formed on the basis of hydrocarbons, such as isobutane.
• the two sections of different temperatures of the evaporator 16 are designed as a C-shaped freezer compartment evaporator 17 with a rear wall evaporator 19 for a normal cooling compartment, which is connected in terms of refrigeration via a connecting web 18.
• the evaporator 16 is formed by welding two aluminum sheet metal plates 20 and 21 of equal area, of which the plate 20 is provided with a pressure corresponding to its course to produce refrigerant channels, while the plate 21 is unprinted.
• an aluminum sheet with the designation AL 99.5 W7 with a material thickness of 0.75 mm has already been found to be suitable for producing the refrigerant channels 22, while an aluminum sheet with the designation AL has been found for the unprinted board 21 1230 and a material thickness of 0.6 mm has already achieved good results.
• the materials used can be used to produce refrigerant channels 22, the cross section of which is particularly suitable for the so-called roll bond process the management of hydrocarbon-based refrigerants, such as isobutane with the industrial name R600a, and which have a cross-sectional area whose size exceeds the duct cross-sectional areas used so far with CFC or CFC-based refrigerants by 50%.
• the invention can also be applied to a board-like evaporator 16, the refrigerant channels 22 of which are produced in the so-called Z-bonding process.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Lubricants (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6532864

Family Applications (1)

Country Status (9)

Families Citing this family (7)

Family Cites Families (4)

• 1994
  • 1994-11-09 DE DE4439996A patent/DE4439996C5/de not_active Expired - Fee Related
• 1995
  • 1995-10-06 ES ES95115790T patent/ES2145862T3/es not_active Expired - Lifetime
  • 1995-10-06 DE DE59508129T patent/DE59508129D1/de not_active Revoked
  • 1995-10-06 EP EP95115790A patent/EP0711963B1/de not_active Revoked
  • 1995-10-06 SI SI9530405T patent/SI0711963T1/xx unknown
  • 1995-10-06 PT PT95115790T patent/PT711963E/pt unknown
  • 1995-11-08 BR BR9505127A patent/BR9505127A/pt not_active IP Right Cessation
  • 1995-11-09 TR TR95/01397A patent/TR199501397A2/xx unknown
  • 1995-11-09 CN CN95121549A patent/CN1090743C/zh not_active Expired - Fee Related
• 2000
  • 2000-04-21 GR GR20000400980T patent/GR3033298T3/el not_active IP Right Cessation

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