EP0730719A1 - Refrigerating exchanger, method for controlling same, and refrigeration facility comprising said exchanger - Google Patents
Refrigerating exchanger, method for controlling same, and refrigeration facility comprising said exchangerInfo
- Publication number
- EP0730719A1 EP0730719A1 EP95902819A EP95902819A EP0730719A1 EP 0730719 A1 EP0730719 A1 EP 0730719A1 EP 95902819 A EP95902819 A EP 95902819A EP 95902819 A EP95902819 A EP 95902819A EP 0730719 A1 EP0730719 A1 EP 0730719A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circulation
- elements
- exchanger
- defrosting
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- F25B39/028—Evaporators having distributing means
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
- F25B41/48—Arrangements for diverging or converging flows, e.g. branch lines or junctions for flow path resistance control on the downstream side of the diverging point, e.g. by an orifice
-
- 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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
-
- 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
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
- F25D17/067—Evaporator fan units
-
- 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
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
-
- 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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
- F25B2347/021—Alternate defrosting
Definitions
- the invention relates to a refrigeration exchanger, a method for controlling such an exchanger and a refrigeration installation comprising such an exchanger.
- the refrigeration installation can be a cold room, a freezing or deep-freezing room, a refrigerated sales cabinet or a refrigerated display case or the like.
- Such an installation comprises a bodywork which delimits an enclosure inside which a given temperature - low - must be maintained.
- air circulation means capable of circulating, in this enclosure, air and at least one refrigerant exchanger through which a refrigerant or refrigerant fluid flows.
- Such an exchanger is usually in the form of a battery having several layers and several rows.
- the battery is arranged in two elements which are similar to each other, mounted in parallel, separated from each other by partitions. Each element has its own air flow and its own fan.
- This structure makes it possible to maintain a satisfactory humidity level, the evaporators always operating alternately.
- Document GB-A-2 164 133 also relates to a structure tending to maintain a satisfactory humidity level in a refrigerated display case. The structure includes two evaporators mounted in parallel, one providing a cooling function, while the other provides a humidification function.
- the invention aims to allow defrosting of an exchanger of a refrigeration installation while simultaneously maintaining in the enclosure with which this installation is associated an acceptable refrigeration temperature and in accordance with the required requirements and avoiding to have excess cooling capacity compared to requirements.
- the invention proposes, according to a first aspect, a refrigerant exchanger as previously mentioned, in which the battery comprises at least three elements each having a power which is a fraction of the total nominal power of the exchanger, so as to allow, at a given moment in the operation of the exchanger, at least one of the elements to be in defrosting condition and at least two of the elements in defrosting condition of cold production, the elements being alternately in a defrosting situation and in a cold production situation.
- the exchanger which includes heat exchange means, further comprises air circulation means on the heat exchange means arranged to form a common air flow at the inlet and a common air flow at the battery outlet.
- the exchanger also comprises selective means for circulation or non-circulation of air on the heat exchange means of each element so that the circulation of air is authorized for certain elements. and prohibited for others.
- control means are associated with control means.
- the circulation of air is authorized for the elements in situation of production of cold and prohibited for the elements in situation of defrosting.
- Heating means of the heat exchange means for each of the elements are provided so as to be active for an element for which the circulation of air is prohibited and inactive for an element by which the circulation of air is authorized.
- the invention relates to a method for controlling such an exchanger in which: - In a given cycle N of operation of the exchanger, at least two of the elements for producing cold are made operational while at least one of the elements is placed in a defrosting situation; - when the defrosting of the element (s) in the defrosting situation is completed or sufficient, we pass to another similar cycle N + 1, in which one or more element (s) in the cold production situation in the cycle N are brought into a defrosting situation while the element (s) in a defrosting situation in the N cycle are brought into a cold production situation.
- the invention relates to a refrigeration installation which comprises on the one hand a refrigeration exchanger controlled by the process which has just been mentioned and on the other hand a circuit for the refrigerant or refrigerant, between the outlets and the inputs of the battery cells.
- Such an installation comprises selective means for circulation or non-circulation of the refrigerant or refrigerant in each of the elements of the battery so that circulation is ensured for the elements in a situation of production of cold and circulation is prohibited for the or the element (s) in a defrost situation.
- Such selective means include valves or equivalent and means for controlling said valves.
- the circuit for the refrigerant or refrigerant comprises at least in part several branches mounted in parallel, in a number equal to that of the elements of the battery, one branch per element.
- the circuit comprises on its entirety several branches mounted in parallel.
- a regulator common to several elements can be provided. And, in particular, a single regulator mounted on a single branch of the circuit.
- a distributor of the refrigerant is interposed between this single branch downstream of the regulator and the plurality of branches upstream of the selective circulation or non-circulation means.
- FIG. 1 is a schematic perspective view of a portion of the refrigeration installation according to the invention.
- FIG. 2 is a schematic view in vertical section of an exchanger for cold room ceiling at negative temperature according to an alternative embodiment of the invention.
- Figure 2a is a view similar to Figure 2, of another embodiment of this variant.
- FIG. 3 is a schematic sectional view of a distributor with integrated valves for installation according to the invention.
- FIG. 4 is a perspective view of an embodiment of a dispenser.
- FIG. 5 is an axial sectional view along the line V.V of Figure 4.
- a refrigeration installation according to the invention comprises a refrigeration exchanger 1 and a circuit 2 for the refrigerant or refrigerant circulating in the exchanger 1.
- Air circulation means 4 are able to put the air from the enclosure 3 in circulation while ensuring its passage over the exchanger 1. These means 4 may include a fan 13.
- the refrigeration chamber 3 can be a cold room, a freezing or deep-freezing room, a refrigerated sales cabinet or a refrigerated display case or other similar arrangement.
- This enclosure 3 can be brought to a temperature of the order of a few degrees celsius, for example typically of the order of 2 ° C for application to the preservation of fresh food products (Figure 1). In other applications, the temperature in enclosure 3 may be negative ( Figure 2).
- the refrigerating exchanger 1 comprises means 5 for circulating a refrigerating or refrigerant fluid in the form of tubes. Means 5 are associated with surface heat exchanging means 6. These means 6 are for example successive fins, spaced from one another, mounted transversely around the tubes of the means 5.
- the means 5 for circulating refrigerant or refrigerant and the heat exchange means 6 are arranged in the form of a battery having several layers 7 and several rows 8.
- the layers 7a to 7e are placed substantially horizontally.
- the rows 8a to 8e are placed substantially vertically.
- plies 7 and rows 8 are arranged in a plurality of elements 9 similar to each other from the structural point of view which, together form the battery.
- each element 9a, 9b, 9c, 9d, 9e is provided which each correspond to a ply 7a, 7b, 7c, 7d and 7e.
- Each element has five rows 8a, 8b, 8c, 8d and 8e.
- the elements 9 are mounted in parallel as regards the means 5. They form a compact unit and are separated from each other by partitions 10.
- the heat exchange means 6 are separated from each other for the different elements 9 so as to avoid any thermal bridge between them.
- the partitions 10 provide a certain thermal insulation between the elements 9. They also collect water from defrosting to prevent it from passing into a neighboring element.
- the partitions 10 can be in the form of solid plates having good thermal insulation capacity.
- the partitions 10 and the heat exchange means 6 are devoid of thermal bridges between them.
- the partitions 10 are arranged substantially horizontally or slightly inclined to the horizontal to ensure the flow of water from defrosting.
- FIG. 1 represents the case of an element comprising a single ply 7, it should be understood that the invention applies to the case where each element 9 comprises several plies 7.
- each of them comprises its own inlet 11 and outlet 12, belonging to the means 5 for circulating refrigerant or refrigerant.
- the battery 5, 6 which has just been described forms a unitary whole, the elements 9 which compose it being placed one next to the other.
- Battery 5, 6 includes at least three elements
- Each element 9 has a cooling power which is only a fraction of the total nominal power of 1 exchanger 1.
- the cooling capacity of element 9 is understood to mean the cooling power that this element is capable of providing in a normal operating situation.
- the total nominal cooling capacity of the heat exchanger 1 is understood to mean the power that the heat exchanger has under normal operating conditions. This situation is such that 1 • exchanger then makes it possible to reach in enclosure 3 the desired temperature.
- the elements 9 are in turn in a defrosting situation and in a cold production situation.
- the cooling capacity developed by all of the elements 9 in a cold production situation corresponds to the cooling power required for the enclosure 3 to be at the required temperature.
- each element 9 is arranged to have a power equal to half the total normal power of the exchanger. Indeed, two elements 9 work together.
- the battery 5, 6 comprises four elements 9, these each have a cooling capacity equal to one third of the total normal power of the exchanger.
- each element 9 has a cooling power equal to a quarter of the total normal power of the exchanger.
- each element 9 is in a defrosting situation one cycle every n cycles and in a cold production situation n-1 cycles every n cycles.
- the air circulation means 4 ensure the passage of air over the heat exchange means 6. These means 4 are arranged to define and form an air flow which, both at the inlet and at the outlet of the battery 5, 6 is common to the different elements 9.
- One or more fans 13 are provided interposed on the common air flow of the battery 5, 6, at the inlet and / or at the outlet. When several fans are provided, these all act on the common air flow.
- a heat exchanger 1 as just described is controlled as follows: In a given operating cycle N, at least two of the elements 9 are made operational for the production of cold while at least one of the elements 9 is placed in a defrosting situation.
- one or more elements 9 in a cold production situation in the N cycle are brought into a defrosting situation.
- the element or elements 9 in a defrosting situation in the cycle N are brought, conversely, in a situation of production of cold.
- the passage from one cycle N to the next cycle N + 1 is controlled either by a prior adjustment of the duration of each cycle, or by a command linked to the operation of the exchanger 1 or of the installation which incorporates it and in particular the degree of icing of the heat exchange means 6.
- the durations of the successive cycles may be different.
- control method which has just been described applies under normal conditions when the installation has been operating for a certain time and when one or more elements 9 have frost on the corresponding heat exchange means 6.
- the control method which has just been described applies under normal conditions when the installation has been operating for a certain time and when one or more elements 9 have frost on the corresponding heat exchange means 6.
- the cooling power temporarily used is equal to one and a half times the total nominal power of the exchanger 1.
- the starting power is 25% higher than the total nominal power of the exchanger 1.
- These means 14 are such that circulation is ensured for the elements 9 in a cold production situation and that circulation is prohibited or not ensured for the elements 9 in a defrosting situation.
- the selective means 14 comprise valves 15 or equivalent and means 16 for controlling said valves 15.
- valves 15 are associated with the various elements 9.
- the selective means 14 are located either on the side of the inputs 11 of the elements 9 of the battery 5, 6 or on the side of the outputs 12.
- the circuit 2 comprises at least several branches 17 mounted in parallel, in a number equal to that of the elements 9 of the battery 5, 6. Each element 9 corresponds to a branch 17.
- the circuit 2 partly comprises several branches 17 mounted in parallel on the side of the inputs 11, and a single branch 18 on the side of the outputs 12.
- a bundle can be substituted single from several branches to single branch 18.
- circuit 2 has on its whole several branches such that 17.
- FIG. 1 relates to an installation intended for a refrigerant.
- the exchanger 2 is then an evaporator since it allows a change of phase of the refrigerant in the gas phase at the inputs 11 and in the liquid phase at the outputs 12.
- a single regulator 19 is provided mounted on the branch 18. This regulator 19 also allows a phase change. Liquid upstream, the refrigerant passes into the gaseous phase downstream.
- the circuit or exchanger 2 also comprises - in this case upstream of the holder 19 - means 21 of refrigeration production able in particular to suck in refrigerant at low pressure from a manifold 22 connecting the parallel outlets 12.
- the installation may also include means, not shown, such as probe, clock, calculator, the function of which is to identify the degree of icing of the elements 9 during cold production as well as the degree of defrosting of the elements 9 in a defrosting situation.
- These locating means can be coupled to the selective means 14 for circulation or non-circulation of the refrigerant or refrigerant.
- the degree of icing can be measured, for example, by the pressure drop of the air flow in an element 9 between its inlet and its outlet. Indeed, the more the heat exchange means 6 are covered with frost, the more difficult the passage of air takes place. Means are then provided for measuring this pressure drop.
- the installation can include control means, not shown, means 4 for air circulation which can also be coupled to the selective means 14 for circulation or non-circulation of the refrigerant or refrigerant.
- the installation may include sensors or detectors for temperature and / or flow as well as means such as clock or time delay and, more generally, control or regulation or safety members useful or necessary for the operation of this type of installation.
- the partitions 10 ensure, according to one possible embodiment, a certain retention of the water from defrosting. Although this does not appear in the application considered essential, it follows that the circulating air can be humidified, to a certain extent, by contact with the defrosting water.
- the partitions 10 ensure the evacuation of water from defrosting.
- the partitions 10 are inclined on the horizontal and the defrosting water eliminated at the low collection point.
- the invention also includes the case where several batteries are provided such as 5, 6 mounted in series or in parallel.
- FIG. 2 shows an installation part comprising the exchanger 1 and the air circulation means 4, intended to be placed in a part at negative ambient temperature.
- this part is the enclosure which is intended to be at negative temperature.
- the installation part considered comprises a casing 23 fixed to a wall 24 which constitutes a ceiling.
- the arrangement of the exchanger and the installation which comprises, represented in FIG. 2, is similar to that of FIG. 1.
- the exchanger comprises, in addition to the constituent elements already described, selective means 25 for circulation or non-circulation of air on the heat exchange means of each element 9.
- the means 25 are such that the circulation of air is authorized for certain elements 9 and prohibited for others.
- the selective means 25 comprise movable flaps 26 or equivalent associated with control means. These control means are in particular the means 16 provided in connection with the selective means 14 for circulation or non-circulation of refrigerant or refrigerant.
- the control means are such that the selective means 25 are controlled so that the circulation of air is authorized for the elements 9 in a cold production situation and prohibited for the elements 9 in a defrosting situation.
- the exchanger of the installation further comprises heating means 27 heat exchange means 6.
- the heating means 27 are associated with each of the elements 9 of the battery. They are also associated with the means for controlling the selective means 25. The control of the means for heating 27 is such that these heating means 27 are active (that is to say heating) for an element 9 for which the circulation of air is prohibited (element in defrosting situation) and are inactive for an element 9 for which the circulation of air is authorized (element in situation of production of cold).
- the heating means 27 are functionally coupled to the selective air circulation or non-circulation means 25.
- the movable flaps 26 of the selective means 25 can be pivotally mounted between an extreme open position and an opposite extreme closed position. In FIG. 2, four flaps 26a are in the open position and a flap 26b in the closed position.
- the flaps 26 are located on the upstream side with respect to the general direction of flow of the air represented by the arrow D.
- Another series of flaps can be arranged downstream of the elements 9, to completely isolate the defrosting element or elements from the air flow.
- the selective means 25 are in the form of fans.
- a fan is provided for each element 9. In operation, the fans ensure the passage of air. When stopped, a fan prevents or in any case hinders the passage of air into the corresponding element.
- the heating means 27 can be the subject of different alternative embodiments. According to an achievement possible, these are heating resistors or hot blown air.
- the partitions 10 each include means 28 for collecting water from defrosting and means 29 for discharging this water are also provided.
- FIG. 2a represents an exchanger such as that shown in FIG. 2 with a wall 30 of vertical direction rather than horizontal for the wall 24.
- the air circulation means 4 are placed in the upper position while the partitions 10 are placed in the lower position.
- the partitions 10 are, in this embodiment, generally vertical.
- the defrosting water then falls vertically and can be collected by a tank 31 having evacuation means 32.
- the distributor 20 in an embodiment where it integrates two functions.
- the first function is to distribute the refrigerant or refrigerant to the parallel branches 17.
- the second function is to allow the flow of refrigerant or refrigerant to be cut on each branch 17 independently of each other.
- the distributor 20 includes an inlet 33 for the fluid 1 which communicates with a distribution chamber 34.
- This distribution chamber communicates, opposite the inlet 33, with a plurality of outlets 35.
- the valves 15 are arranged near the outlets 35.
- the outputs 35 are themselves connected to the branches 17 of the installation.
- the distributor 20 is equipped with solenoid valves 36, the coils of which are mounted on armature sleeves 37, and a removable plate 38 is integral with said sleeves 37.
- Each sleeve 37 is tightly fixed on the plate 38.
- a core or armature 39 movable in the direction of arrow N is illustrated in the low position in Figure 5 and then closes the way of the distributor outlet when the coil is energized.
- the core or armature 39 clears the passage or exit path of the fluid when the coil is de-energized.
- the pipe coming from the refrigeration production equipment of the installation and opening into the chamber 34 is preferably made of metal and brazed or welded to the distributor 20.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Removal Of Water From Condensation And Defrosting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9314460 | 1993-12-02 | ||
FR9314460A FR2713320B1 (en) | 1993-12-02 | 1993-12-02 | Process for continuous control and defrosting of a refrigeration exchanger and installation equipped with such an exchanger. |
PCT/FR1994/001401 WO1995015467A1 (en) | 1993-12-02 | 1994-11-30 | Refrigerating exchanger, method for controlling same, and refrigeration facility comprising said exchanger |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0730719A1 true EP0730719A1 (en) | 1996-09-11 |
EP0730719B1 EP0730719B1 (en) | 1998-06-03 |
Family
ID=9453484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95902819A Expired - Lifetime EP0730719B1 (en) | 1993-12-02 | 1994-11-30 | Refrigerating exchanger, method for controlling same, and refrigeration facility comprising said exchanger |
Country Status (9)
Country | Link |
---|---|
US (1) | US5704221A (en) |
EP (1) | EP0730719B1 (en) |
JP (1) | JPH09505879A (en) |
AT (1) | ATE166958T1 (en) |
CA (1) | CA2178080A1 (en) |
DE (1) | DE69410823T2 (en) |
ES (1) | ES2118541T3 (en) |
FR (1) | FR2713320B1 (en) |
WO (1) | WO1995015467A1 (en) |
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CN109579387B (en) * | 2019-01-11 | 2021-01-15 | 北京机械设备研究所 | Defrosting method of air source heat pump system based on single-outside heat exchanger multi-branch alternate defrosting |
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US11116333B2 (en) | 2019-05-07 | 2021-09-14 | Carrier Corporation | Refrigerated display cabinet including microchannel heat exchangers |
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- 1994-11-30 JP JP7515448A patent/JPH09505879A/en active Pending
- 1994-11-30 EP EP95902819A patent/EP0730719B1/en not_active Expired - Lifetime
- 1994-11-30 DE DE69410823T patent/DE69410823T2/en not_active Expired - Lifetime
- 1994-11-30 ES ES95902819T patent/ES2118541T3/en not_active Expired - Lifetime
- 1994-11-30 WO PCT/FR1994/001401 patent/WO1995015467A1/en active IP Right Grant
- 1994-11-30 AT AT95902819T patent/ATE166958T1/en not_active IP Right Cessation
- 1994-11-30 CA CA002178080A patent/CA2178080A1/en not_active Abandoned
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CN105276874A (en) * | 2014-07-10 | 2016-01-27 | 南京理工大学 | Heat pump air-conditioning unit achieving thermal defrosting through supercooling of stored liquid |
Also Published As
Publication number | Publication date |
---|---|
DE69410823T2 (en) | 1999-01-14 |
ES2118541T3 (en) | 1998-09-16 |
DE69410823D1 (en) | 1998-07-09 |
CA2178080A1 (en) | 1995-06-08 |
EP0730719B1 (en) | 1998-06-03 |
FR2713320B1 (en) | 1996-02-02 |
US5704221A (en) | 1998-01-06 |
JPH09505879A (en) | 1997-06-10 |
FR2713320A1 (en) | 1995-06-09 |
WO1995015467A1 (en) | 1995-06-08 |
ATE166958T1 (en) | 1998-06-15 |
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