CN103216964A - Refrigerating system and method used for refrigerating - Google Patents
Refrigerating system and method used for refrigerating Download PDFInfo
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- CN103216964A CN103216964A CN2013101184154A CN201310118415A CN103216964A CN 103216964 A CN103216964 A CN 103216964A CN 2013101184154 A CN2013101184154 A CN 2013101184154A CN 201310118415 A CN201310118415 A CN 201310118415A CN 103216964 A CN103216964 A CN 103216964A
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Abstract
The invention provides a refrigerating system. The refrigerating system comprises a refrigerating circuit, wherein along the flow direction, the refrigerating circuit is provided with a compressor, a gas cooler, a first expansion device, an intermediate pressure container, a second expansion device, an evaporator and refrigerant pipelines through which refrigerants can circularly pass, wherein the refrigerants can be expanded to an intermediate pressure grade by the first expansion device; a first refrigerant pipeline of the refrigerant pipelines is connected with the compressor and the gas cooler, a second refrigerant pipeline of the refrigerant pipelines is connected with the gas cooler and the first expansion device, and a transcritical part of the refrigerating circuit is formed by the first refrigerant pipeline, the gas cooler and the second refrigerant pipeline; and the refrigerating system also comprises an overheat reducing unit, wherein the overheat reducing unit is in a heat exchange relation with at least one part of the second refrigerant pipeline, and thus the overheat of the refrigerant can be reduced. The invention also provides a method used for refrigerating.
Description
The application is that application number is 200780102213.3, international filing date is on November 13rd, 2007, denomination of invention is divided an application for the application for a patent for invention of " refrigeration system and the method that is used to freeze ".
Technical field
The method that the present invention relates to refrigeration system and be used to freeze.
Background technology
The refrigeration system that comprises refrigerating circuit is well-known in this area.By making such as CO
2Cold-producing medium to be in the compressor of striding critical condition (transcritical state) refrigerating circuit of turning round on the compressor high-pressure side also be known.In these systems, especially when turning round under the wirking pressure value of the high-pressure side of compressor at about 120 bar, be difficult to make cold-producing medium to obtain the cooling of expectation.From 30 ℃ of beginnings, be issued to the cooling of expectation at high ambient temperature, can cause low energy efficiency.
Summary of the invention
Therefore, providing a kind of more effective refrigeration system, will be favourable even also can obtain expected performance when high ambient temperature.
Illustrative embodiments of the present invention comprises a kind of refrigeration system, it comprises refrigerating circuit, the refrigerant tubing that the refrigerating circuit streamwise has compressor, gas cooler, first expansion gear, intermediate pressure container, second expansion gear, evaporimeter and cold-producing medium is cycled through, wherein, first expansion gear is expanded to the intermediate pressure grade with cold-producing medium.First refrigerant tubing of refrigerant tubing connects compressor and gas cooler, and second refrigerant tubing of refrigerant tubing connects the gas cooler and first expansion gear, and first and second refrigerant tubings form the critical part of striding of refrigerating circuit.Compressor can turn round and stride critical condition so that cold-producing medium is in striding critical part.Refrigeration system is characterised in that it also comprises reduction overheated (desuperheat) unit, reduces hot cell and becomes heat exchanging relation with at least a portion of second refrigerant tubing, and thus in the running, it is overheated that the cold-producing medium that will circulate in refrigerating circuit reduces.
Illustrative embodiments of the present invention also comprises a kind of method that is used to freeze, and it comprises the steps: cold-producing medium is compressed to strides the critical pressure grade; Cold-producing medium in the refrigerating gas cooler; By with reduced the hot cell heat exchange cold-producing medium is reduced overheated; By first expansion gear cold-producing medium is expanded to the intermediate pressure grade; Cold-producing medium is flowed in the intermediate pressure container; By the further swell refrigeration agent of second expansion gear; And make flow of refrigerant pass through evaporimeter, thereby the environment of cooling evaporimeter.
Description of drawings
Following with reference to accompanying drawing more detailed description embodiments of the present invention, wherein:
Fig. 1 has shown the schematic diagram according to exemplary refrigeration system of the present invention, wherein reduces hot cell and comprises refrigerant loop.
Fig. 2 has shown the schematic diagram according to another exemplary refrigerant system of the present invention, and wherein middle heat-exchanging loop is arranged at refrigerating circuit and reduced between the hot cell.
The specific embodiment
Fig. 1 has shown the refrigeration system 2 according to one embodiment of the present invention.Refrigeration system 2 comprises refrigerating circuit 4 and reduced hot cell 6.Refrigerating circuit 4 comprises six parts in the refrigerating circuit that is usually used in striding running critically: compressor 8, gas cooler 10, first expansion gear 12, intermediate pressure container 14, second expansion gear 16 and evaporimeter 18.These elements are connected by refrigerant tubing, and by means of this, cold-producing medium cycles through said elements.First refrigerant tubing 22 connects compressor 8 and gas cooler 10, second refrigerant tubing 24 connects the gas cooler 10 and first expansion gear 12, the 3rd refrigerant tubing 26 connects first expansion gear 12 and intermediate pressure container 14, the 4th refrigerant tubing 28 connects the intermediate pressure container 14 and second expansion gear 16, the 5th refrigerant tubing 30 connects second expansion gear 16 and evaporimeter 18, the six refrigerant tubings 32 connect evaporimeter 18 and compressor 8.
Be appreciated that said structure is exemplary, and its modification is same feasible.Especially, can select to replace single parts with a plurality of parts.For example, compressor 8 can be replaced by one group of compressor; A plurality of evaporimeters 18 equally also can be arranged, each evaporimeter 18 and 16 associatings of corresponding second expansion gear.And, by mode parts are set with direct fluid connection to each other, can save independent pipeline.
Refrigerating circuit 4 comprises also that from middle pressure vessel 14, particularly wherein the gas compartment to the feedback channel again (refeed passage) of the suction side of compressor 8, this is optional for refrigeration system of the present invention among Fig. 1.Feedback channel comprises the 3rd expansion gear 20, connects intermediate pressure container 14 and the 7th refrigerant tubing 34 of the 3rd expansion gear 20 and the 8th refrigerant tubing 36 that is connected the 3rd expansion gear 20 and compressor 8 again.
In the illustrative embodiments of Fig. 1, reduced hot cell 6 and comprised reduction superheat refrigeration loop 40.Reduce superheat refrigeration loop 40 streamwises and comprise compressor 42, condenser 44 and expansion gear 46.Refrigerant tubing 48 connects the said elements that reduces in the superheat refrigeration loop, and cycles through cold-producing medium wherein.
The part of second refrigerant tubing 24 of refrigerating circuit 4 with reduced by 6 one-tenth heat exchanging relations of hot cell.Realize heat exchange by heat exchanger 38, heat exchanger 38 couple refrigerating circuit 4 second refrigerant tubing 24 a part and reduce the part of the refrigerant tubing 48 in superheat refrigeration loop 40, and it is arranged between the expansion gear 46 and compressor 42 that reduces superheat refrigeration loop 40.To those skilled in the art obvious be to have the method for heat exchange between multiple realization two elements.Term " heat exchanger " should be used to the solution that comprises that all these are equivalent in this article.
Be further appreciated that reducing hot cell 6 only comprises refrigerating circuit 40 in the example embodiment shown in fig. 1.Being applicable to by carrying out heat exchange with at least a portion of second refrigerant tubing 24 provides the different implementations overheated to the reduction of refrigerating circuit 4 inner refrigerants, also should fall within the scope of the invention.
Description below is according to the running of the refrigeration system 2 of illustrative embodiments among Fig. 1:
Running compressor 8 makes such as CO
2Cold-producing medium enter first refrigerant tubing 22 to stride critical condition.When using CO
2The time, the on high-tension side typical pressure value of compressor reaches 120 bar.Then, cold-producing medium is cooled in gas cooler 10.Cold-producing medium leaves the lowest temperature that gas cooler has and depends on environment temperature.Therefore, cold-producing medium enters second refrigerant tubing 24 with the temperature of the environment temperature that is higher than gas cooler 10.
Gas cooler 10 can have various embodiments.In one embodiment, air was blowed the total of gas cooler 10, thereby took away from the heat in the refrigerating circuit 4 with fan.This air can be rich in water droplet, and this has increased the thermal capacity of the fluid that was blowed whole gas cooler 10.Also can imagine system based on liquid cools.Other embodiment is obvious to those skilled in the art.
In the part of second refrigerant tubing 24, cold-producing medium is lowered overheated, promptly by with the heat exchange that reduced hot cell 6, the temperature that will be in the cold-producing medium of striding critical condition reduces.For this purpose, the part of second refrigerant tubing 24 is arranged in the heat exchanger 38.
Flow of refrigerant by first expansion gear, 12, the first expansion gears 12 with cold-producing medium from striding critical expansion to the intermediate pressure grade.Cold-producing medium arrives intermediate pressure container 14 by the 3rd refrigerant tubing 26.The cold-producing medium---and as the optional feature that embodies in the present embodiment---that intermediate pressure container 14 is collected under the pressure rating that mediates separates gaseous refrigerant with liquid refrigerant.Liquid phase refrigerant flows through the 4th refrigerant tubing 28, second expansion gear 16 and the 5th refrigerant tubing 30, arrives evaporimeter 18 with the minimum temperature that will will reach in refrigerating circuit 4 with cold-producing medium after reexpansion.This allows the environment of evaporimeter 18 be cooled off.After this heat exchange, cold-producing medium flow back into compressor 8 by the 6th refrigerant tubing 32.Vapor phase refrigerant feeds back to compressor 8 by the 7th refrigerant tubing 34, the 3rd expansion gear 20 and the 8th refrigerant tubing 36 again from middle pressure vessel 14, and this is because it can not be used for cooling effectively as liquid phase refrigerant.
In the illustrative embodiments of Fig. 1, come from flow of refrigerant in the group of forming by propane, propylene, butane, R410A, R404A, R134a, ammonia, DP1 and liquid hydrogen by reducing the reduction superheated refrigerant loop 40 of hot cell 6.Because propane and propylene are natural-gas, and other option is a forming gas, therefore in a lot of embodiments, can preferably use propane and propylene.To those skilled in the art obvious be that what to have other is used to reduce cold-producing medium option in the superheat refrigeration loop 40.
The cold-producing medium that reduces superheat refrigeration loop 40 is by compressor 42 compressions.In embodiment shown in Figure 1, cold-producing medium does not reach strides critical condition.Cold-producing medium all is being in gas phase between heat exchanger 38 and the compressor 42 and between compressor 42 and the condenser 44.After condenser 44 and till heat exchanger 38, cold-producing medium is in liquid phase.Flow of refrigerant makes cold-producing medium leave expansion gear 46 with the state that had cooled off, and can make heat be delivered to it by condenser 44 and expansion gear 46.
Then, reduce flow of refrigerant in the superheat refrigeration loop 40, in heat exchanger 38, carry out this cold-producing medium and cycle through heat exchange between the cold-producing medium of refrigerating circuit 4 by heat exchanger 38.When flowing through heat exchanger 38, be higher than the temperature that reduces refrigerant temperature in the superheat refrigeration loop 40 because the cold-producing medium in the refrigerating circuit 4 is in second refrigerant loop 24, therefore the cold-producing medium of heat from refrigerating circuit 4 is delivered to the cold-producing medium that reduces in the superheat refrigeration loop 40.That is the back flow of refrigerant in reducing superheat refrigeration loop 40 arrives before the compressor 42 that reduces superheat refrigeration loop 40, and the thermal capacity that reduces cold-producing medium in the superheat refrigeration loop 40 is used for heat exchanger 38.
In Fig. 1, shown the heat exchanger 38 that is in the following current state.Heat exchanger also can have adverse current or other mode connects.Adverse current is more effective usually, so adverse current can be preferred selection.
Fig. 2 has shown according to the present invention the refrigeration system 2 of another embodiment.Refrigerating circuit 4 and the corresponding component that reduced among hot cell 6 and Fig. 1 have same structure.Their running is also roughly the same.Therefore, similar reference number is represented similar element.
Compared to Figure 1, difference is refrigerating circuit 4 and reduced the mode that realizes heat exchange between the hot cell 6.In the embodiment of Fig. 2, realize heat exchange by middle heat-exchanging loop 50.In this embodiment, refrigerating circuit 4 with reduced hot cell 6 and do not become direct heat transfer relation.
Middle heat-exchanging loop 50 comprises first heat exchanger 52 and second heat exchanger 54.First heat exchanger 52 has been set up the heat exchanging relation between refrigerating circuit 4 and the Intermediate Heat Exchanger loop 50.Second heat exchanger 54 has been set up Intermediate Heat Exchanger loop 50 and had been reduced heat exchanging relation between the hot cell 6.Cold-producing medium flows by Intermediate Heat Exchanger loop 50, repeats to flow through first heat exchanger 52 and passes through second heat exchanger 54 subsequently.Such as maintenance cold-producing medium or the mobile device not demonstrations in Fig. 2 of refrigerating medium such as pump picking devices, but be obvious to those skilled in the art.
Cold-producing medium or refrigerating medium in the middle heat-exchanging loop 50, for example water or salt solution are cooled in second heat exchanger 64 down, thereby transfer heat to the cold-producing medium that reduced in the hot cell 6.On the other hand, in first heat exchanger 52, the cold-producing medium in the middle of the cold-producing medium of heat from the refrigerating circuit 4 that flows through second refrigerant tubing 24 is delivered in the heat-exchanging loop 50.Heat exchanger 52 and 54 can have following current, adverse current or other mode and be connected.Adverse current is more effective usually, so adverse current can be preferred selection.
Because refrigerating circuit 4 and reduced hot cell 6 and spatially separates, so this structure is allowed and is placed refrigerating circuit 4 more neatly and reduced hot cell 6.But the cold-producing medium in the refrigerating circuit 4 is still overheated by reducing hot cell 6 reductions.To those skilled in the art obvious be that Intermediate Heat Exchanger loop 50 can be replaced heat by any from the device that first heat exchanger 52 be delivered to second heat exchanger 54.Under the proper temperature grade, intermediate loop 50 and reduced hot cell 6 and also can be used for cooling off the cold consumer that other has needs, for example air conditioner facility.
As mentioned above, illustrative embodiments of the present invention makes refrigeration system more effective, makes that particularly refrigerating circuit is more effectively turned round.Except gas cooler, reducing hot cell provides second kind of type of cooling for the cold-producing medium of striding critical part in the refrigerating circuit.This makes the cold-producing medium in the refrigerating circuit more effectively cool off.Especially, this structure is allowed and is remedied the energy shortcoming that refrigerating circuit had of striding critical operation.Because condensation do not take place in striding the gas cooler of critical operation, the energy that therefore is delivered to environment is not as many.This inherent defect that refrigerating circuit had of striding critical operation partly remedied by reducing hot cell, and this makes the refrigeration system that can at high temperature turn round, and need not excessively to improve the pressure and temperature of cold-producing medium on the compressor pressure side.Will not reduce hot cell and incorporate in the refrigerating circuit, have lot of advantages: can very compact mode form no matter the layout of refrigerating circuit how, reduces hot cell.And, have seldom or do not have adaptive change/modification reduction hot cell can be used for various refrigerating circuits, this has allowed to have cost-benefit mode and has produced.Reduce hot cell and also can utilize the cooling technology that under high ambient temperature, does not have same disadvantages.Compact Design is allowed the efficient and cost-benefit structure of employing, and has under the situation that reduces the superheated refrigerant loop, allows the cold-producing medium that uses minimum.When the control refrigeration system, adjust the cooling capacity that reduced hot cell, comprise turn-offing and reduced hot cell, and therefore adjustment is overheated to the reduction of cold-producing medium in the refrigerating circuit, and another free degree is provided.
The cold-producing medium of refrigerating circuit can be CO
2This feasible CO that can utilize as cold-producing medium
2Useful performance.
In an embodiment of the invention, reduce hot cell and can comprise reduction superheated refrigerant loop.This makes in the flexibility that has height aspect structure performance that reduced hot cell and the layout.Reduce the refrigerant tubing that the superheated refrigerant loop can comprise compressor, condenser, expansion gear and connect above-mentioned reduction superheated refrigerant loop element and cold-producing medium is cycled through.This has allowed reducing the independent design of superheated refrigerant loop parameter, for example is used for the condenser inner refrigerant is expected the force value of system's different piece of cooling off.But, still can very compact mode form and can be used no matter the size of refrigerating circuit how, reduces hot cell.
The cold-producing medium that reduces in the superheated refrigerant loop can all be in the non-critical condition of striding in all parts in reducing the superheated refrigerant loop.The cold-producing medium that reduces the superheated refrigerant loop can leave compressor under very high temperature, make to carry out heat exchange efficiently with environment.In conjunction with the energy transmission of being undertaken by condensating refrigerant in condenser, turn round in the reduction superheated refrigerant loop that reduced hot cell mode very efficiently.Reduce any that the cold-producing medium in superheated refrigerant loop can be in the group of being made up of propane, propylene, butane, R410A, R404A, R134a, ammonia, DP1 and liquid hydrogen.
Below also be possible, promptly reduced hot cell and comprise the device that is used for thermoelectric-cooled that in some applications, the comparable reduction superheated refrigerant of this thermo-electric cooling device loop is easier to running or more practical.
Illustrated as mentioned, below be possible, promptly realize second refrigerant tubing of refrigerating circuit and reduced heat exchange between the hot cell by heat exchanger.Heat exchanger can constitute second refrigerant tubing that spatially is close to refrigerating circuit and the suitable part that reduced hot cell.Heat exchanger provides from refrigerating circuit cold-producing medium to the high efficiencies of heat transfer that reduced hot cell.
What another was possible is, refrigeration system comprise with refrigerating circuit with reduced the middle heat-exchanging loop that hot cell becomes heat exchanging relation.This has allowed refrigerating circuit and had reduced hot cell and spatially separate.Therefore, reduced hot cell and can be arranged in favorable environment, for example be positioned on the roof of building.By further the gas cooler of refrigerating circuit and the condenser that reduced hot cell being separated, can improve the efficient of total system.Under the situation of using combustible refrigerant, may be favourable for security reason separates two refrigerating circuits.In addition, middle heat-exchanging loop has the free degree of himself, and for example used cold-producing medium or the flow velocity of cold-producing medium, middle heat-exchanging loop provide another kind of method for the whole refrigeration system of control.Middle heat-exchanging loop can be salt solution or water loop.Middle heat-exchanging loop can comprise first heat exchanger and second heat exchanger, and first heat exchanger is used for realizing and the heat exchange of refrigerating circuit second refrigerant tubing that second heat exchanger is used to realize and the heat exchange that reduced hot cell.
In another embodiment of the present invention, the intermediate pressure container in the refrigerating circuit can separate liquid refrigerant in the running with gaseous refrigerant.This has allowed in the environment of evaporimeter in refrigerating circuit and has cooled off more efficiently.Refrigerating circuit also can comprise additional refrigerant tubing and the 3rd expansion gear, and additional refrigerant tubing is connected the gas phase part of intermediate pressure container with the suction side of compressor, and the 3rd expansion gear is arranged in the additional refrigerant tubing.According to the present invention, this additional refrigerant tubing can form less size, this is because of the cooling effectiveness that has improved the cold-producing medium of striding critical part in the refrigerating circuit---this cooling realizes by reducing hot cell, make cold-producing medium when arriving intermediate pressure container, the major part of cold-producing medium becomes liquid phase.Therefore, the smaller portions of cold-producing medium are by additional refrigerant tubing feedback.
Possible in addition is that in the running, the pressure of cold-producing medium is lower than 120 bar in the critical part of striding of refrigerating circuit.This has allowed use standardization pipe fitting.The pressure that keeps below 120 bar is very important for keeping system cost cheap, and this is owing to the pipe fitting that can bear elevated pressures is very expensive.Also possible pressure of striding critical part inner refrigerant is higher than 120 bar.Therefore, in the most hot area, the world, refrigeration system also can be moved very efficiently.
In another embodiment, reducing hot cell optionally turns on and off.
The gas cooler of refrigerating circuit is provided for a plurality of fans.The performance of refrigeration system can be by the running right quantity the fan level and reduced hot cell by running and set, thereby make cold-producing medium in the refrigerating circuit obtain the overheated grade of reduction of expectation.With a plurality of fans with reduced hot cell and regard a plurality of cooling performance levels as, can realize cold-producing medium is reduced overheated meticulousr control.Especially, if reduced the performance gain that the performance gain of hot cell acquisition obtains less than the additional fan level of operation by running, then when not needing a large amount of reductions overheated, can reduce minimum classification performance under the instantaneous system condition, this can save big energy.Similar consideration also is applicable to when the situation that adopts a plurality of compressor stages in refrigerating circuit.
All parts in accompanying drawing and the list of reference characters exemplarily are shown as single parts.Each parts also can be a plurality of parts.
By means of the above-mentioned method that is used to freeze in according to an exemplary embodiment of the present, can obtain the advantage identical with refrigeration system.This method can by with further improved about the corresponding method step of the described feature of refrigeration system.For fear of giving unnecessary details, the embodiment and the improvement of this method that is used to freeze will be repeated no longer.
Although described the present invention with reference to illustrative embodiments, it will be understood to those of skill in the art that without departing from the present invention, various variations can be carried out and the equivalence replacement can be carried out element wherein.In addition, under the situation that does not break away from essential scope of the present invention, can much revise so that particular condition or material adapt to teaching of the present invention.Therefore, the intent of the present invention is not limited to disclosed specific implementations, but the present invention will comprise all embodiments that fall in the claims scope.
List of numerals:
2 refrigeration systems
4 refrigerating circuits
6 reduced hot cell
8 compressors
10 gas coolers
12 first expansion gears
14 intermediate pressure containers
16 second expansion gears
18 evaporimeters
20 the 3rd expansion gears
22 first refrigeration pipings
24 second refrigeration pipings
26 the 3rd refrigerant tubings
28 the 4th refrigerant tubings
30 the 5th refrigerant tubings
32 the 6th refrigerant tubings
34 the 7th refrigerant tubings
36 the 8th refrigerant tubings
38 heat exchangers
40 reduce the superheated refrigerant loop
42 reduce superheated refrigerant loop compressor
44 reduce superheated refrigerant loop condenser
46 reduce the superheated refrigerant circuit expansion device
48 reduce superheated refrigerant loop refrigerant tubing
Heat-exchanging loop in the middle of 50
52 first intermediate loop heat exchangers
54 second intermediate loop heat exchangers.
Claims (16)
1. a refrigeration system (2), it comprises refrigerating circuit (4), described refrigerating circuit (4) streamwise has compressor (8), gas cooler (10), first expansion gear (12), intermediate pressure container (14), second expansion gear (16), evaporimeter (18) and refrigerant tubing (22,24,26,28,30,32), and it makes the cold-producing medium circulation from wherein passing through;
Wherein, described first expansion gear (12) is expanded to the intermediate pressure grade with described cold-producing medium;
Wherein, first refrigerant tubing (22) of described refrigerant tubing (22,24,26,28,30,32) connects described compressor (8) and described gas cooler (10), second refrigerant tubing (24) of described refrigerant tubing (22,24,26,28,30,32) connects described gas cooler (10) and described first expansion gear (12), and described first refrigerant tubing (22), described gas cooler (10) and described second refrigerant tubing (24) have formed the critical part of striding of described refrigerating circuit (4);
Wherein, described compressor (8) can turn round so that described cold-producing medium described stride to be in the critical part stride critical condition;
Wherein, described refrigerant system (2) comprises also and reduced hot cell (6) that the described hot cell (6) that reduced becomes heat exchanging relation with at least a portion of described second refrigerant tubing (24), thus in the running, it is overheated that the cold-producing medium that will circulate in described refrigerating circuit (4) reduces
It is characterized in that, intermediate pressure container (14) in the described in the running refrigerating circuit (4) separates liquid refrigerant with gaseous refrigerant, and described refrigerating circuit (4) also comprises additional refrigerant tubing (34,36) and the 3rd expansion gear (20), described additional refrigerant tubing (34,36) is connected the gas phase part of described intermediate pressure container (14) with the suction side of described compressor (8), described the 3rd expansion gear (20) is arranged in the described additional refrigerant tubing (34,36).
2. refrigeration system according to claim 1 (2), wherein, the cold-producing medium in the described refrigerating circuit (4) is CO
2
3. refrigeration system according to claim 1 and 2 (2), wherein, the described hot cell (6) that reduced comprises reduction superheated refrigerant loop (40).
4. refrigeration system according to claim 3 (2), wherein, described reduction superheated refrigerant loop (40) comprises reduction superheated refrigerant loop compressor (42), reduces superheated refrigerant loop condenser (44), reduces superheated refrigerant circuit expansion device (46) and reduces superheated refrigerant loop refrigerant tubing (48), and it makes the cold-producing medium circulation from wherein passing through.
5. according to claim 3 or 4 described refrigeration systems (2), wherein, the cold-producing medium in the described reduction superheated refrigerant loop (40) is in the non-critical condition of striding.
6. according to each described refrigeration system (2) in the claim 3 to 5, wherein, a kind of in the group formed by propane, propylene, butane, R410A, R404a, R134a, ammonia, DP1 and liquid hydrogen of the cold-producing medium in described reduction superheated refrigerant loop (40).
7. refrigeration system according to claim 1 and 2 (2), wherein, the described hot cell (6) that reduced comprises the device that is used for thermoelectric-cooled.
8. according to each described refrigeration system (2) in the aforementioned claim, wherein, described second refrigerant tubing (24) and the described heat exchange that reduced between the hot cell (6) are realized by heat exchanger (38).
9. according to each described refrigeration system (2) in the claim 1 to 7, wherein, heat-exchanging loop (50) in the middle of described refrigeration system (2) comprises, described middle heat-exchanging loop (50) becomes heat exchanging relation with described refrigerating circuit (4) with the described hot cell (6) that reduced.
10. refrigeration system according to claim 9 (2), wherein, described middle heat-exchanging loop (50) is salt solution or water loop.
11. according to claim 9 or 10 described refrigeration systems (2), wherein, heat-exchanging loop (50) comprises first heat exchanger (52) and second heat exchanger (54) in the middle of described, described first heat exchanger (52) is used for realizing and the heat exchange of described second refrigerant tubing (24) that described second heat exchanger (54) is used for realizing and the described heat exchange that reduced hot cell (6).
12. according to each described refrigeration system (2) in the aforementioned claim, wherein, in the running, the pressure of described cold-producing medium is lower than 120 bar striding of described refrigerating circuit (4) in the critical part.
13. according to each described refrigeration system (2) in the aforementioned claim, wherein, the described hot cell (6) that reduced optionally turns on and off.
14. according to each described refrigeration system (2) in the aforementioned claim, wherein, a plurality of fan levels are provided with described gas cooler (10).
15. refrigeration system according to claim 14 (2), wherein, the performance of described refrigeration system (2) is partly controlled by the fan level of running right quantity and by the described hot cell (6) that reduced that turns round, thereby makes the overheated grade of reduction of the cold-producing medium acquisition expectation in the described refrigerating circuit (4).
16. a method that is used to freeze, it comprises the steps:
Cold-producing medium is compressed to strides the critical pressure grade;
Cold-producing medium in the refrigerating gas cooler (10);
By with reduced hot cell (6) heat exchange described cold-producing medium is reduced overheated;
By first expansion gear (12) described cold-producing medium is expanded to the intermediate pressure grade;
Described cold-producing medium is flowed in the intermediate pressure container (14);
By second expansion gear (16) the described cold-producing medium that further expands; And
Make described flow of refrigerant by evaporimeter (18), thereby cool off the environment of described evaporimeter (18);
By described intermediate pressure container (14) liquid refrigerant is separated with gaseous refrigerant; And
Additional refrigerant tubing (34,36) and the 3rd expansion gear (20) is provided, described additional refrigerant tubing (34,36) is connected the gas phase part of described intermediate pressure container (14) with the suction side of described compressor (8), described the 3rd expansion gear (20) is arranged in the described additional refrigerant tubing (34,36).
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| CN2007801022133A CN101939601B (en) | 2007-11-13 | 2007-11-13 | Refrigerating system and method for refrigerating |
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| CN201310118417.3A Active CN103216965B (en) | 2007-11-13 | 2007-11-13 | Refrigeration system and the method for freezing |
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| CN106969522A (en) * | 2017-04-17 | 2017-07-21 | 安徽中科都菱商用电器股份有限公司 | A kind of modularization overlapping refrigerating cycle system of medical refrigerator |
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| CN110908413B (en) * | 2018-09-14 | 2022-07-15 | 开利公司 | Temperature controller, master controller, temperature adjusting system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969522A (en) * | 2017-04-17 | 2017-07-21 | 安徽中科都菱商用电器股份有限公司 | A kind of modularization overlapping refrigerating cycle system of medical refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103216965B (en) | 2016-02-24 |
| CN103216965A (en) | 2013-07-24 |
| CN103216964B (en) | 2016-01-20 |
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