CN103216965B - Refrigeration system and the method for freezing - Google Patents
Refrigeration system and the method for freezing Download PDFInfo
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- CN103216965B CN103216965B CN201310118417.3A CN201310118417A CN103216965B CN 103216965 B CN103216965 B CN 103216965B CN 201310118417 A CN201310118417 A CN 201310118417A CN 103216965 B CN103216965 B CN 103216965B
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Abstract
The invention provides a kind of refrigeration system, comprise refrigerating circuit, the refrigerant tubing that refrigerating circuit streamwise has compressor, gas cooler, the first expansion gear, intermediate pressure container, the second expansion gear, evaporimeter and refrigerant circulation is passed through.Cold-producing medium is expanded to intermediate pressure grade by the first expansion gear.First refrigerant tubing of refrigerant tubing connects compressor and gas cooler, the second refrigerant pipeline of refrigerant tubing connects gas cooler and the first expansion gear, and the first refrigerant tubing, gas cooler and second refrigerant pipeline define the Trans-critical cycle part of refrigerating circuit.Refrigerant system also comprises and reduced hot cell, and that reduced hot cell and second refrigerant pipeline becomes heat exchanging relation, at least partially thus by de-superheat refrigerant.Present invention also offers a kind of method for freezing.
Description
The application is application number is 200780102213.3, the divisional application of international filing date to be November 13, denomination of invention in 2007 the be application for a patent for invention of " refrigeration system and the method for freezing ".
Technical field
The present invention relates to refrigeration system and the method for freezing.
Background technology
The refrigeration system comprising refrigerating circuit is well-known in this area.By making such as CO
2cold-producing medium on compressor high-pressure side, be in the operate compressor of refrigerating circuit of Trans-critical cycle state (transcriticalstate) be also known.In such systems, especially when operating under wirking pressure value at about 120bar of the high-pressure side of compressor, be difficult to make cold-producing medium obtain the cooling expected.From 30 DEG C of beginnings, reach the cooling of expectation at a high ambient temperature, low energy efficiency can be caused.
Summary of the invention
Therefore, also can obtain expected performance provide a kind of more effective refrigeration system, even if when high ambient temperature will be favourable.
Illustrative embodiments of the present invention comprises a kind of refrigeration system, it comprises refrigerating circuit, the refrigerant tubing that refrigerating circuit streamwise has compressor, gas cooler, the first expansion gear, intermediate pressure container, the second expansion gear, evaporimeter and refrigerant circulation is passed through, wherein, cold-producing medium is expanded to intermediate pressure grade by the first expansion gear.First refrigerant tubing of refrigerant tubing connects compressor and gas cooler, and the second refrigerant pipeline of refrigerant tubing connects gas cooler and the first expansion gear, and the first and second refrigerant tubings form the Trans-critical cycle part of refrigerating circuit.Compressor can operate to make cold-producing medium be in Trans-critical cycle state in Trans-critical cycle part.The feature of refrigeration system is that it also comprises and reduces overheated (desuperheat) unit, and that reduced hot cell and second refrigerant pipeline becomes heat exchanging relation, at least partially thus in the running, by the de-superheat refrigerant at refrigerating circuit Inner eycle.
Illustrative embodiments of the present invention also comprises a kind of method for freezing, and it comprises the steps: refrigerant compression to Trans-critical cycle pressure rating; Cold-producing medium in refrigerating gas cooler; By with reduced hot cell heat exchange by de-superheat refrigerant; By the first expansion gear, cold-producing medium is expanded to intermediate pressure grade; Cold-producing medium is made to flow in intermediate pressure container; By the further swell refrigeration agent of the second expansion gear; And make flow of refrigerant by evaporimeter, thus the environment of cooling evaporator.
Accompanying drawing explanation
Referring to accompanying drawing more detailed description embodiments of the present invention, wherein:
Fig. 1 shows the schematic diagram according to exemplary refrigeration system of the present invention, wherein reduces hot cell and comprises refrigerant loop.
Fig. 2 shows the schematic diagram according to another exemplary refrigerant system of the present invention, and wherein intermediate heat transfer loop is arranged at refrigerating circuit and reduced between hot cell.
Detailed description of the invention
Fig. 1 shows 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 being usually used in transcritically operating: 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, refrigerant circulation passes through said elements.First refrigerant tubing 22 connects compressor 8 and gas cooler 10, second refrigerant pipeline 24 connects gas cooler 10 and the first expansion gear 12,3rd refrigerant tubing 26 connects the first expansion gear 12 and intermediate pressure container 14,4th refrigerant tubing 28 connects intermediate pressure container 14 and the second expansion gear 16,5th refrigerant tubing 30 connects the second expansion gear 16 and evaporimeter the 18, six refrigerant tubing 32 connects evaporimeter 18 and compressor 8.
Be appreciated that said structure is exemplary, and its amendment is feasible equally.Especially, can select to replace single parts with multiple parts.Such as, compressor 8 can be replaced by one group of compressor; Equally also can have multiple evaporimeter 18, each evaporimeter 18 is combined with the second corresponding expansion gear 16.Further, by with the mode setting parts of direct flow connection to each other, independent pipeline can be saved.
In Fig. 1, refrigerating circuit 4 also comprises the feedback channel again (refeedpassage) from intermediate pressure container 14, the particularly gas compartment wherein to the suction side of compressor 8, and this is optional for refrigeration system of the present invention.Feedback channel comprises the 3rd expansion gear 20, connects the 7th refrigerant tubing 34 of intermediate pressure container 14 and the 3rd expansion gear 20 and be connected the 8th refrigerant tubing 36 of 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 streamwise and comprise compressor 42, condenser 44 and expansion gear 46.Refrigerant tubing 48 connects the said elements reduced in superheat refrigeration loop, and cycles through cold-producing medium wherein.
The part of the second refrigerant pipeline 24 of refrigerating circuit 4 with reduced hot cell 6 one-tenth heat exchanging relation.Heat exchange is realized by heat exchanger 38, heat exchanger 38 couples a part for a part for the second refrigerant pipeline 24 of refrigerating circuit 4 and the refrigerant tubing 48 in reduction superheat refrigeration loop 40, and between its expansion gear 46 being arranged at reduction superheat refrigeration loop 40 and compressor 42.It is apparent to persons skilled in the art that there is the multiple method realizing heat exchange between two elements.Term " heat exchanger " should be used for the solution comprising all these equivalences in this article.
Be further appreciated that reducing hot cell 6 only comprises refrigerating circuit 40 in the example embodiment shown in fig. 1.Be applicable to, by providing the different implementations overheated to the reduction of refrigerating circuit 4 inner refrigerant from the carrying out heat exchange at least partially of second refrigerant pipeline 24, also should fall within the scope of the invention.
Description below is according to the running of the refrigeration system 2 of illustrative embodiments in Fig. 1:
Running compressor 8, makes such as CO
2cold-producing medium enter the first refrigerant tubing 22 with Trans-critical cycle state.As use CO
2time, the on high-tension side typical pressure value of compressor reaches 120bar.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 pipeline 24 with the temperature of the environment temperature higher than gas cooler 10.
Gas cooler 10 can have various embodiment.In one embodiment, with fan, blow air is crossed the total of gas cooler 10, thus take away from the heat in refrigerating circuit 4.This air can be rich in water droplet, which increases by the thermal capacity of the fluid blowing whole gas cooler 10.Also the system based on liquid cools can be imagined.Other embodiment is obvious to those skilled in the art.
In a part for second refrigerant pipeline 24, cold-producing medium is lowered overheated, namely by with the heat exchange reducing hot cell 6, will be in the cold-producing medium of Trans-critical cycle state temperature reduce.For this purpose, a part for second refrigerant pipeline 24 is arranged in heat exchanger 38.
Cold-producing medium is expanded to intermediate pressure grade from Trans-critical cycle by the first expansion gear 12, first expansion gear 12 by flow of refrigerant.Cold-producing medium arrives intermediate pressure container 14 by the 3rd refrigerant tubing 26.Gaseous refrigerant is separated with liquid refrigerant by the cold-producing medium---and as the optional feature embodied in the present embodiment---that intermediate pressure container 14 is collected under the pressure rating that mediates.Liquid phase refrigerant flows through the 4th refrigerant tubing 28, second expansion gear 16 and the 5th refrigerant tubing 30, the minimum temperature that will reach in refrigerating circuit 4 is arrived evaporimeter 18 with cold-producing medium after reexpansion.This allows the environment of evaporimeter 18 be cooled.After this heat exchange, cold-producing medium flow back into compressor 8 by the 6th refrigerant tubing 32.Vapor phase refrigerant, by the 7th refrigerant tubing 34, the 3rd expansion gear 20 and the 8th refrigerant tubing 36, feeds back to compressor 8 again from intermediate pressure container 14, this is because it can not effectively for cooling as liquid phase refrigerant.
In the illustrative embodiments of Fig. 1, come from flow of refrigerant in the group be made up of 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 forming gas, therefore can preferably use propane and propylene in a lot of embodiment.It is apparent to persons skilled in the art that exist other for reducing the cold-producing medium option in superheat refrigeration loop 40.
The cold-producing medium reducing superheat refrigeration loop 40 is compressed by compressor 42.In the embodiment shown in fig. 1, cold-producing medium does not reach Trans-critical cycle state.Cold-producing medium is all in gas phase between heat exchanger 38 and compressor 42 and between compressor 42 and condenser 44.After condenser 44 and until heat exchanger 38, cold-producing medium is in liquid phase.Flow of refrigerant, by condenser 44 and expansion gear 46, makes cold-producing medium leave expansion gear 46 with cooled state, and heat trnasfer can be made to arrive it.
Then, the flow of refrigerant reduced in superheat refrigeration loop 40 passes through heat exchanger 38, carries out the heat exchange between this cold-producing medium and the cold-producing medium cycling through refrigerating circuit 4 in heat exchanger 38.When flowing through heat exchanger 38, because the cold-producing medium in refrigerating circuit 4 is in the temperature higher than reducing refrigerant temperature in superheat refrigeration loop 40 in second refrigerant loop 24, therefore heat is delivered to from the cold-producing medium refrigerating circuit 4 cold-producing medium reduced in superheat refrigeration loop 40.That is, before reducing the back flow of refrigerant in superheat refrigeration loop 40 to the compressor 42 reducing superheat refrigeration loop 40, reduce the thermal capacity of cold-producing medium in superheat refrigeration loop 40 in heat exchanger 38.
In FIG, the heat exchanger 38 being in following current state is shown.Heat exchanger also can have adverse current or other mode connects.Adverse current is usually more effective, and therefore adverse current can be preferred selection.
Fig. 2 shows the refrigeration system 2 according to another embodiment of the present invention.Refrigerating circuit 4 and reduced hot cell 6, with the corresponding component in Fig. 1, there is identical structure.Their running is also roughly the same.Therefore, similar reference number represents similar element.
Compared to Figure 1, difference is refrigerating circuit 4 and reduced the mode realizing heat exchange between hot cell 6.In the embodiment of Fig. 2, realize heat exchange by intermediate heat transfer loop 50.In this embodiment, refrigerating circuit 4 with reduced hot cell 6 and do not become direct heat transfer relation.
Intermediate heat transfer loop 50 comprises First Heat Exchanger 52 and the second heat exchanger 54.First Heat Exchanger 52 establishes the heat exchanging relation between refrigerating circuit 4 and Intermediate Heat Exchanger loop 50.The heat exchanging relation that second heat exchanger 54 establishes Intermediate Heat Exchanger loop 50 and reduced between hot cell 6.Cold-producing medium is flowed by Intermediate Heat Exchanger loop 50, repeats to flow through First Heat Exchanger 52 also subsequently by the second heat exchanger 54.Such as pump picking devices etc. keep the device of cold-producing medium or refrigerating medium flowing not show in fig. 2, but are obvious to those skilled in the art.
Cold-producing medium in intermediate heat transfer loop 50 or refrigerating medium, such as water or salt solution, be cooled, thus transfer heat to the cold-producing medium reduced in hot cell 6 in the second heat exchanger 64.On the other hand, in First Heat Exchanger 52, heat is delivered to the cold-producing medium in intermediate heat transfer loop 50 from flow through the cold-producing medium in the refrigerating circuit 4 of second refrigerant pipeline 24.Heat exchanger 52 and 54 can have following current, adverse current or other mode and be connected.Adverse current is usually more effective, and therefore adverse current can be preferred selection.
Due to refrigerating circuit 4 with reduced hot cell 6 and be spatially separated, therefore this structure is allowed and is placed refrigerating circuit 4 more neatly and reduced hot cell 6.But the cold-producing medium in refrigerating circuit 4 still by reduced hot cell 6 reduce overheated.It is apparent to persons skilled in the art that the device that heat is delivered to the second heat exchanger 54 from First Heat Exchanger 52 can be replaced by any by Intermediate Heat Exchanger loop 50.Under proper temperature grade, intermediate loop 50 and reduced hot cell 6 and also can be used for cooling other cold consumer in need, such as air conditioner facility.
As mentioned above, illustrative embodiments of the present invention makes refrigeration system more effective, particularly makes refrigerating circuit more effectively be operated.Except gas cooler, reducing hot cell is that the cold-producing medium of Trans-critical cycle part in refrigerating circuit provides the second type of cooling.This makes the cold-producing medium in refrigerating circuit more effectively cool.Especially, this structure allows the energy shortcoming that the refrigerating circuit making up Trans-critical cycle running has.Not there is condensation due in the gas cooler that operates at Trans-critical cycle, be therefore delivered to the energy of environment not as many.This inherent defect that the refrigerating circuit of Trans-critical cycle running has partly made up by reducing hot cell, and this makes it possible at high temperature operate refrigeration system, and without the need to excessively improving the pressure and temperature of cold-producing medium on compressor pressure side.Be not incorporated in refrigerating circuit by reducing hot cell, there is lot of advantages: the layout of no matter refrigerating circuit how, and reducing hot cell can mode closely be formed.Further, have seldom or do not have the reduction of adaptive change/modification hot cell can be used for various refrigerating circuit, allowing the atmosphere to have cost-benefit mode and produce.Reduce hot cell and also can utilize the cooling technology at a high ambient temperature without same disadvantages.Compact design allows the efficient and cost-benefit structure of employing, and when having reduction superheated refrigerant loop, allows the cold-producing medium using minimum.When controlling refrigeration system, adjustment reduced the cooling capacity of hot cell, comprised shutoff and reduced hot cell, and therefore adjusted the reduction of cold-producing medium in refrigerating circuit overheated, provided another free degree.
The cold-producing medium of refrigerating circuit can be CO
2.This makes it possible to utilize the CO as cold-producing medium
2useful performance.
In an embodiment of the invention, reduce hot cell and can comprise reduction superheated refrigerant loop.This makes the flexibility in the structural expression reducing hot cell and layout with height.Reduce superheated refrigerant loop can comprise compressor, condenser, expansion gear and connect above-mentioned reduction superheated refrigerant loop element and the refrigerant tubing that refrigerant circulation is passed through.Allowing the atmosphere the independent design to reducing superheated refrigerant loop parameter, such as carry out expecting cooling to condenser inner refrigerant system in the force value of different piece.But the size of no matter refrigerating circuit how, reduced hot cell and still can be formed in a very compact manner and can be used.
The cold-producing medium reduced in superheated refrigerant loop can all be in non-Trans-critical cycle state in all parts in reduction superheated refrigerant loop.The cold-producing medium reducing superheated refrigerant loop can leave compressor at very high temperatures, makes to carry out efficient heat exchange with environment.The energy transferring carried out in combination with condensating refrigerant in condenser, the reduction superheated refrigerant loop reducing hot cell can mode operate very efficiently.The cold-producing medium reducing superheated refrigerant loop can for any one in the group that is made up of propane, propylene, butane, R410A, R404A, R134a, ammonia, DP1 and liquid hydrogen.
Below be also possible, namely reduced hot cell and comprise device for thermoelectric-cooled, in some applications, this thermo-electric cooling device comparable reduction superheated refrigerant loop is easier to running or more practical.
As described above, be below possible, the second refrigerant pipeline namely realizing refrigerating circuit by heat exchanger and the heat exchange reduced between hot cell.Heat exchanger can be configured to spatially be close to the second refrigerant pipeline of refrigerating circuit and reduced the suitable part of hot cell.Heat exchanger to provide from refrigerating circuit cold-producing medium to the high efficiencies of heat transfer reducing hot cell.
Another is it is possible that refrigeration system comprises and refrigerating circuit and the intermediate heat transfer loop reducing hot cell and become heat exchanging relation.Allowing the atmosphere refrigerating circuit and reduced hot cell and be spatially separated.Therefore, reducing hot cell can be arranged in favorable environment, such as, be positioned on the roof of building.By the gas cooler of refrigerating circuit and the condenser reducing hot cell being separated further, the efficiency of total system can be improved.When using combustible refrigerant, may be favourable in order to two refrigerating circuits are separated by security reason.In addition, intermediate heat transfer loop has himself the free degree, cold-producing medium such as used or the flow velocity of cold-producing medium, and intermediate heat transfer loop is given and controlled whole refrigeration system and provide another kind of method.Intermediate heat transfer loop can be salt solution or water loop.Intermediate heat transfer loop can comprise First Heat Exchanger and the second heat exchanger, and First Heat Exchanger is for realizing the heat exchange with second refrigerant pipeline in refrigerating circuit, and the second heat exchanger is for the heat exchange realized with reduced hot cell.
In another embodiment of the present invention, liquid refrigerant can be separated with gaseous refrigerant by intermediate pressure container in refrigerating circuit in the running.Cool more efficiently in the environment allowing the atmosphering evaporimeter in refrigerating circuit.Refrigerating circuit also can comprise additional refrigerant tubing and the 3rd expansion gear, and the gas phase portion of intermediate pressure container is connected with the suction side of compressor by additional refrigerant tubing, and the 3rd expansion gear is arranged in additional refrigerant tubing.According to the present invention, this additional refrigerant tubing can form less size, this is because improve the cooling effectiveness to the cold-producing medium of Trans-critical cycle part in refrigerating circuit---this cooling realized 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.
In addition it is possible that in the running, the pressure of cold-producing medium in the Trans-critical cycle part of refrigerating circuit lower than 120bar.Allowing the atmosphere and use standardization pipe fitting.It is very important for keeping below the pressure of 120bar with low cost for keeping system, and this is that pipe fitting owing to can bear elevated pressures is very expensive.Also the pressure of possible Trans-critical cycle part inner refrigerant is higher than 120bar.Therefore, in the area that the world is the most hot, refrigeration system also can be run very efficiently.
In another embodiment, reduced hot cell optionally to turn on and off.
There is provided the gas cooler of refrigerating circuit can also to multiple fan.The performance of refrigeration system by the right quantity that operates fan level and reduced hot cell by running and set, thus make the cold-producing medium in refrigerating circuit obtain the overheated grade of reduction expected.By multiple fan with reduced hot cell and regard as multiple cooling energy level, the more precise controlling to de-superheat refrigerant can be realized.Especially, if reduced by running the performance gain that hot cell obtains to be less than the performance gain running additional fan level and obtain, then when do not need under instantaneous system condition a large amount of reduce overheated time, can reduce minimum classification performance, this can save large energy.Similar consideration is also applicable to the situation when adopting multiple compressor stage in refrigerating circuit.
All parts in accompanying drawing and list of reference characters are exemplarily shown as single parts.Each parts also can be multiple parts.
By means of above-mentioned according to an exemplary embodiment of the present in method for freezing, the advantage identical with refrigeration system can be obtained.This method is by being improved further with about the corresponding method step of the feature described in refrigeration system.In order to avoid repeating, will no longer repeat embodiment and the improvement of this method for freezing.
Although describe 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 change can be carried out and equivalence can be carried out to element wherein replacing.In addition, when not departing from essential scope of the present invention, can carry out much revising to make particular condition or material adapt to teaching of the present invention.Therefore, the intent of the present invention is not limited to disclosed particular implementation, but the present invention will comprise all embodiments fallen within the scope of claims.
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 superheated refrigerant loop
42 reduce superheated refrigerant circuit compressor
44 reduce superheated refrigerant circuit condenser
46 reduce superheated refrigerant circuit expansion device
48 reduce superheated refrigerant circuit refrigerant pipeline
50 intermediate heat transfer loops
52 first intermediate loop heat exchangers
54 second intermediate loop heat exchangers.
Claims (14)
1. a refrigeration system (2), it comprises refrigerating circuit (4), described refrigerating circuit (4) streamwise has compressor (8), gas cooler (10), the first expansion gear (12), intermediate pressure container (14), the second expansion gear (16), evaporimeter (18) and refrigerant tubing (22,24,26,28,30,32), and it makes refrigerant circulation from wherein passing through;
Wherein, described cold-producing medium is expanded to intermediate pressure grade by described first expansion gear (12);
Wherein, first refrigerant tubing (22) of described refrigerant tubing (22,24,26,28,30,32) connects described compressor (8) and described gas cooler (10), the second refrigerant pipeline (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 pipeline (24) define the Trans-critical cycle part of described refrigerating circuit (4);
Wherein, described compressor (8) can operate to make described cold-producing medium be in Trans-critical cycle state in described Trans-critical cycle part;
Wherein, described refrigerant system (2) also comprises and reduced hot cell (6), described reduced hot cell (6) and described second refrigerant pipeline (24) become heat exchanging relation at least partially, thus in the running, will at the de-superheat refrigerant of described refrigerating circuit (4) Inner eycle
It is characterized in that, described refrigeration system (2) comprises intermediate heat transfer loop (50), described intermediate heat transfer loop (50) becomes heat exchanging relation with described refrigerating circuit (4) with the described hot cell (6) that reduced, described intermediate heat transfer loop (50) is salt solution or water loop, described intermediate heat transfer loop (50) comprises First Heat Exchanger (52) and the second heat exchanger (54), described First Heat Exchanger (52) is for realizing the heat exchange with described second refrigerant pipeline (24), described second heat exchanger (54) is for realizing and the described heat exchange reducing hot cell (6),
Wherein, the described hot cell (6) that reduced can optionally be turned on and off.
2. refrigeration system according to claim 1 (2), wherein, the cold-producing medium in 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 reduces superheated refrigerant circuit compressor (42), reduction superheated refrigerant circuit condenser (44), reduction superheated refrigerant circuit expansion device (46) and reduces superheated refrigerant circuit refrigerant pipeline (48), and it makes refrigerant circulation from wherein passing through.
5. refrigeration system according to claim 3 (2), wherein, the cold-producing medium in described reduction superheated refrigerant loop (40) is in non-Trans-critical cycle state.
6. refrigeration system according to claim 3 (2), wherein, the one in the group that the cold-producing medium of described reduction superheated refrigerant loop (40) is made up of propane, propylene, butane, R410A, R404a, R134a, ammonia, DP1 and liquid hydrogen.
7. refrigeration system according to claim 1 and 2 (2), wherein, the described hot cell (6) that reduced comprises device for thermoelectric-cooled.
8. refrigeration system according to claim 1 and 2 (2), wherein, described second refrigerant pipeline (24) and the described heat exchange reduced between hot cell (6) are realized by heat exchanger (38).
9. refrigeration system according to claim 1 and 2 (2), wherein, liquid refrigerant is separated with gaseous refrigerant by the intermediate pressure container (14) in described refrigerating circuit in the running (4).
10. refrigeration system according to claim 9 (2), wherein, described refrigerating circuit (4) also comprises additional refrigerant tubing (34,36) and the 3rd expansion gear (20), the suction side of the gas phase portion of described intermediate pressure container (14) with described compressor (8) is connected by described additional refrigerant tubing (34,36), and described 3rd expansion gear (20) is arranged in described additional refrigerant tubing (34,36).
11. refrigeration systems according to claim 1 and 2 (2), wherein, in the running, the pressure of described cold-producing medium in the Trans-critical cycle part of described refrigerating circuit (4) lower than 120bar.
12. refrigeration systems according to claim 1 and 2 (2), wherein, multiple fan level is provided with described gas cooler (10).
13. refrigeration systems according to claim 12 (2), wherein, the performance of described refrigeration system (2) is by the fan level partially by running right quantity and reduced hot cell (6) by running is described and controls, thus makes the cold-producing medium in described refrigerating circuit (4) obtain the overheated grade of reduction expected.
14. 1 kinds of methods for freezing, it comprises the steps:
By the refrigerant compression in refrigerating circuit (4) to Trans-critical cycle pressure rating;
Cold-producing medium in refrigerating gas cooler (10);
By with reduced hot cell (6) heat exchange by described de-superheat refrigerant;
By the first expansion gear (12), described cold-producing medium is expanded to intermediate pressure grade;
Described cold-producing medium is made to flow in intermediate pressure container (14);
By the second expansion gear (16) described cold-producing medium of expansion further;
Make described flow of refrigerant by evaporimeter (18), thus cool the environment of described evaporimeter (18);
There is provided intermediate heat transfer loop (50), described intermediate heat transfer loop (50) is for salt solution or water loop and comprise First Heat Exchanger (52) and the second heat exchanger (54),
Described refrigerating circuit (4) and the described heat exchange reducing hot cell (6) is realized by described intermediate heat transfer loop (50); Realize the heat exchange between described refrigerating circuit (4) and described intermediate heat transfer loop (50) by described First Heat Exchanger (52), and realize described intermediate heat transfer loop (50) and the described heat exchange reduced between hot cell (6) by described second heat exchanger (54);
Hot cell (6) can be reduced by the mode optionally turned on and off to provide described with it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310118417.3A CN103216965B (en) | 2007-11-13 | 2007-11-13 | Refrigeration system and the method for freezing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007801022133A CN101939601B (en) | 2007-11-13 | 2007-11-13 | Refrigerating system and method for refrigerating |
| CN201310118417.3A CN103216965B (en) | 2007-11-13 | 2007-11-13 | Refrigeration system and the method for freezing |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007801022133A Division CN101939601B (en) | 2007-11-13 | 2007-11-13 | Refrigerating system and method for refrigerating |
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| CN103216965A CN103216965A (en) | 2013-07-24 |
| CN103216965B true CN103216965B (en) | 2016-02-24 |
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| CN201310118415.4A Active CN103216964B (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 |
| 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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| WO2005052467A1 (en) * | 2003-11-28 | 2005-06-09 | Mitsubishi Denki Kabushiki Kaisha | Freezer and air contitioner |
| KR100642709B1 (en) * | 2004-03-19 | 2006-11-10 | 산요덴키가부시키가이샤 | Refrigerator |
| EP1669697A1 (en) * | 2004-12-09 | 2006-06-14 | Delphi Technologies, Inc. | Thermoelectrically enhanced CO2 cycle |
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| CN103216964B (en) | 2016-01-20 |
| CN103216965A (en) | 2013-07-24 |
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