CN1580670A - Efficient refrigerating system with high-dryness two-phase state evaporator outlet refrigerant - Google Patents
Efficient refrigerating system with high-dryness two-phase state evaporator outlet refrigerant Download PDFInfo
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- CN1580670A CN1580670A CNA2004100184779A CN200410018477A CN1580670A CN 1580670 A CN1580670 A CN 1580670A CN A2004100184779 A CNA2004100184779 A CN A2004100184779A CN 200410018477 A CN200410018477 A CN 200410018477A CN 1580670 A CN1580670 A CN 1580670A
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- temperature sensor
- section regenerator
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- inlet temperature
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- 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
- F25B40/00—Subcoolers, desuperheaters or superheaters
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21174—Temperatures of an evaporator of the refrigerant at the inlet of the evaporator
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of the evaporator
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
This invention is a high efficiency refrigeration system, its refrigerant at the evaporator outlet is in high dryness two-phase state. This system includes compressor, condenser, expanding valve, evaporator, the first-section return-heating set, second-section return-heating set, third section return-heating set, controller, temperature sensor of evaporator inlet, temperature sensor of the first-section return-heating set inlet, temperature sensor of the second-section return-heating set inlet, and the temperature sensor of third-section return-heating set inlet. The temperature signals from the three temperature sensors are all transmitted to the controlled to adjust the opening degree of the expanding valve.
Description
Technical field:
The present invention relates to a kind of refrigeration system, relate in particular to and a kind ofly be used for the fresh-keeping and air conditioning of food storage the evaporator outlet cold-producing medium of low-temperature receiver is provided is the highly effective refrigeration system of big mass dryness fraction two-phase state, belong to refrigeration technology field.
Background technology:
In refrigeration system, refrigerating capacity that refrigerant side has and refrigerating efficiency are all closely related with evaporating temperature.Evaporating temperature is high more, and the refrigerating capacity of refrigerant side is big more, efficient is high more.When but evaporating temperature raises, the heat transfer temperature difference of evaporimeter reduces, the refrigerating capacity that the certain evaporimeter of heat transfer area itself can transmit reduces, and the refrigerating capacity that cold-producing medium has may not discharge fully, can cause the actual refrigerating capacity of system and refrigerating efficiency to reduce like this.Therefore in the design of refrigeration system and operation control, must maximally utilise the heat transfer area of evaporimeter, under the condition of not wasting in the hope of the refrigerating capacity that has at refrigerant side, improve the evaporating temperature of cold-producing medium as far as possible.
The method that present raising refrigeration system operational efficiency is adopted is the degree of superheat of control evaporator outlet, makes it as far as possible little.Because the convection transfer rate of superheated refrigerant is much smaller than the two-phase system cryogen, the increase of refrigerant superheat district area will reduce the heat-transfer capability of evaporimeter.When the degree of superheat increases, increase the flow and the evaporating temperature of cold-producing medium by variable expansion valve, the degree of superheat is reduced, the area of overheated zone reduces, thereby the refrigerating capacity of system is increased, efficient improves.
Adjust the method for flow according to the degree of superheat, though effectively simple, need overheated zone of reservation in the evaporimeter.Further the coefficient of heat transfer the analysis showed that, when the mass dryness fraction of two-phase system cryogen greater than 0.9 the time, the coefficient of heat transfer will sharply descend.Therefore from effectively utilizing evaporimeter, improve the system effectiveness angle and consider that not only should make does not have the overheated zone in the evaporimeter, and should be mass dryness fraction greater than 0.9 two-phase system cryogen.
Since in degree of superheat control, only need probe temperature, fairly simple.And if make evaporimeter, and control its mass dryness fraction with two-phase form outlet, preferably can test mass dryness fraction, and with this as controlled quentity controlled variable.Therefore but mass dryness fraction can not directly be measured, and how to adopt simple effective method, and the cold-producing medium in the evaporimeter is flowed out with the two-phase state of high mass dryness fraction, then is to improve the problem that refrigeration system efficient need solve.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, it is the highly effective refrigeration system of big mass dryness fraction two-phase state that design provides a kind of evaporator outlet cold-producing medium.
For realizing such purpose, refrigeration system provided by the invention mainly comprises: compressor, condenser, expansion valve, evaporimeter, first section regenerator, second section regenerator, the 3rd section regenerator, controller, evaporator temperature sensor, first section regenerator inlet temperature sensor, second section regenerator inlet temperature sensor, the 3rd section regenerator inlet temperature sensor.The temperature signal of evaporator temperature sensor, first section regenerator inlet temperature sensor, second section regenerator inlet temperature sensor, the 3rd section regenerator inlet temperature sensor is all passed to controller, and controller comes the aperture of variable expansion valve according to these temperature signals.The target of control is that cold-producing medium is only occurred in second section regenerator from two-phase to overheated transition point.Like this since in first section regenerator cold-producing medium still be two-phase, so the cold-producing medium of evaporator outlet must be two-phase, because the cold-producing medium in the 3rd section regenerator is overheated certainly, the mass dryness fraction of evaporator outlet can not be very little so simultaneously.As long as the size of each section of appropriate design regenerator can be controlled at the evaporator outlet mass dryness fraction greater than 0.9 and less than 1.During Preliminary design, can make the heat exchange area of first regenerator, second regenerator be equal to half of the 3rd regenerator.Like this because the overheated gas heat exchange amount of system generally is difficult to surpass 10% of whole circulation, when the two-phase of cold-producing medium and overheated transition point are controlled in second regenerator, the mass dryness fraction that can guarantee to enter the cold-producing medium of first regenerator is greater than 0.9, and promptly the cold-producing medium of evaporator outlet is big mass dryness fraction two-phase system cryogen.
Following control strategy is adopted in the control of the aperture of expansion valve: the temperature that records when the evaporator temperature sensor is during less than the temperature of first section regenerator inlet temperature sensor, this moment, the evaporator outlet cold-producing medium was overheated, controller is transferred the aperture of big expansion valve, until the temperature that the evaporator temperature sensor records is greater than or equal to the temperature that first section regenerator inlet temperature sensor records.When the temperature that records when the evaporator temperature sensor is greater than or equal to the temperature of first section regenerator inlet temperature sensor, further relatively first section regenerator inlet temperature sensor and second section temperature that the regenerator inlet temperature sensor records.If the temperature that the temperature that first section regenerator inlet temperature sensor records records less than second section regenerator inlet temperature sensor, it is overheated that just take place this moment in first section heat exchanger, by the aperture that controller is further transferred big expansion valve, the temperature that records up to first section regenerator inlet temperature sensor is greater than or equal to the temperature that second section regenerator inlet temperature sensor records.When the temperature that records when first section regenerator inlet temperature sensor is greater than or equal to the temperature that second section regenerator inlet temperature sensor record, further relatively second section regenerator inlet temperature sensor and the 3rd section temperature that the regenerator inlet temperature sensor records.Two-phase takes place to overheated transformation if the temperature that second section regenerator inlet temperature sensor obtains less than the 3rd section temperature that the regenerator inlet temperature sensor records, illustrates in second section heat exchanger, this is that we are desirable, keeps expansion valve opening constant.If the temperature that second section regenerator inlet temperature sensor records is greater than or equal to the 3rd section temperature that the regenerator inlet temperature sensor records, illustrate that this moment, second section regenerator outlet was two-phase, need reduce the aperture of expansion valve this moment by controller, reducing flow, until the temperature that second section regenerator inlet temperature sensor records is less than the 3rd section temperature that the regenerator inlet temperature sensor records.
The present invention has significant advantage and good effect.The present invention design not only can allow the cold-producing medium of evaporator outlet be controlled at bigger mass dryness fraction but also do not occur overheated, on control method, only need to measure some temperature values simultaneously, the control device cost is lower, and the cold that evaporimeter is not emitted fully is utilized effectively by regenerator.The overall efficiency of system improves like this, and cost increases few.
Description of drawings:
The highly effective refrigeration system schematic that Fig. 1 is the two-phase state for evaporator outlet cold-producing medium of the present invention.
Among the figure, the 1st, compressor, the 2nd, condenser, the 3rd, expansion valve, the 4th, evaporimeter, 5 is first section regenerator, 6 is second section regenerator, 7 is the 3rd section regenerators, the 8th, controller, the 9th, the evaporator temperature sensor, 10 is first section regenerator inlet temperature sensor, 11 is second section regenerator inlet temperature sensor, and 12 is the 3rd section regenerator inlet temperature sensors.
Dotted line represents that control signal connects among the figure.
The specific embodiment:
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described.
As shown in Figure 1, the present invention mainly comprises compressor 1, condenser 2, expansion valve 3, evaporimeter 4, first section regenerator 5, second section regenerator 6, the 3rd section regenerator 7, controller 8, evaporator temperature sensor 9, first section regenerator inlet temperature sensor 10, second section regenerator inlet temperature sensor 11, the 3rd section regenerator inlet temperature sensor 12.
Compressor 1 outlet is connected with condenser 2 imports, condenser 2 outlets are connected with the 3rd section regenerator 7 high-pressure side imports, the 3rd section regenerator 7 high-pressure sides outlet is connected with the 6 high-pressure side imports of second section regenerator, second section regenerator 6 high-pressure sides outlet is connected with the 5 high-pressure side imports of first section regenerator, first section regenerator 5 high-pressure sides outlet is connected with expansion valve 3 imports, expansion valve 3 outlets are connected with evaporimeter 4 imports, evaporimeter 4 outlets are connected with the 5 low-pressure side imports of first section regenerator, first section regenerator 5 low-pressure sides outlet is connected with the 6 low-pressure side imports of second section regenerator, second section regenerator 6 low-pressure sides outlet is connected with the 3rd section regenerator 7 low-pressure side imports, and the 3rd section regenerator 7 low-pressure sides outlet is connected with compressor 1 import.
Following control strategy is adopted in the control of the aperture of expansion valve: the temperature that records when evaporator temperature sensor 9 is during less than the temperature of first section regenerator inlet temperature sensor 10, this moment, evaporimeter 4 outlet cold-producing mediums were overheated, the aperture that controller 8 is transferred big expansion valve 3 is until the temperature that evaporator temperature sensor 9 records is greater than or equal to the temperature that first section regenerator inlet temperature sensor 10 records.When the temperature that records when evaporator temperature sensor 9 is greater than or equal to the temperature of first section regenerator inlet temperature sensor 10, further relatively first section regenerator inlet temperature sensor 10 and second section temperature that regenerator inlet temperature sensor 11 records.If the temperature that the temperature that first section regenerator inlet temperature sensor 10 records records less than second section regenerator inlet temperature sensor 11, it is overheated that just take place this moment in first section heat exchanger 5, by the aperture that controller 8 is further transferred big expansion valve 3, the temperature that records up to first section regenerator inlet temperature sensor 10 is greater than or equal to the temperature that second section regenerator inlet temperature sensor 11 records.When the temperature that records when first section regenerator inlet temperature sensor 10 is greater than or equal to the temperature that second section regenerator inlet temperature sensor 11 record, further relatively second section regenerator inlet temperature sensor 11 and the 3rd section temperature that regenerator inlet temperature sensor 12 records.Two-phase taking place to overheated transformation if the temperature that second section regenerator inlet temperature sensor 11 records less than the 3rd section temperature that regenerator inlet temperature sensor 12 records, illustrates, keeps expansion valve 3 apertures constant in second section heat exchanger 6.If the temperature that second section regenerator inlet temperature sensor 11 records is greater than or equal to the 3rd section temperature that regenerator inlet temperature sensor 12 records, illustrate that 6 outlets of second section regenerator are two-phase, reduce the aperture of expansion valve 3 this moment by controller 8, increasing flow, until the temperature that second section regenerator inlet temperature sensor 11 records is less than the 3rd section temperature that regenerator inlet temperature sensor 12 records.
Claims (3)
1. highly effective refrigeration system that the evaporator outlet cold-producing medium is big mass dryness fraction two-phase state, comprise compressor (1), condenser (2), expansion valve (3), evaporimeter (4), it is characterized in that also comprising first section regenerator (5), second section regenerator (6), the 3rd section regenerator (7), controller (8), evaporator temperature sensor (9), first section regenerator inlet temperature sensor (10), second section regenerator inlet temperature sensor (11), the 3rd section regenerator inlet temperature sensor (12), compressor (1) outlet is connected with condenser (2) import, condenser (2) outlet is connected with the 3rd section regenerator (7) high-pressure side import, the outlet of the 3rd section regenerator (7) high-pressure side is connected with second section regenerator (6) high-pressure side import by tube connector, the outlet of second section regenerator (6) high-pressure side is connected with first section regenerator (5) high-pressure side import by tube connector, the outlet of first section regenerator (5) high-pressure side is connected with expansion valve (3) import, expansion valve (3) outlet is connected with evaporimeter (4) import, evaporimeter (4) outlet is connected with first section regenerator (5) low-pressure side import by tube connector, the outlet of first section regenerator (5) low-pressure side is connected with second section regenerator (6) low-pressure side import by tube connector, the outlet of second section regenerator (6) low-pressure side is connected with the 3rd section regenerator (7) low-pressure side import by tube connector, the outlet of the 3rd section regenerator (7) low-pressure side is connected with compressor (1) import by tube connector, evaporator temperature sensor (9) is installed in to be close on the evaporator pipe outside wall surface, first section regenerator inlet temperature sensor (10) is installed in to be close on first section regenerator (5) low-pressure side inlet connecting branch outside wall surface, second section regenerator inlet temperature sensor (11) is installed in to be close on second section regenerator (6) low-pressure side inlet connecting branch outside wall surface, and the 3rd section regenerator inlet temperature sensor (12) is installed in to be close on the 3rd section regenerator (7) the low-pressure side inlet connecting branch outside wall surface.The output of temperature sensor (9～12) all is electrically connected with controller (8) input, and the output of controller (8) is electrically connected with expansion valve (3) control end.
2. evaporator outlet cold-producing medium according to claim 1 is the highly effective refrigeration system of big mass dryness fraction two-phase state, the aperture control strategy that it is characterized in that expansion valve (3) is: during temperature that the temperature that records when evaporator temperature sensor (9) records less than first section regenerator inlet temperature sensor (10), controller (8) is transferred the aperture of big expansion valve (3), until the temperature that evaporator temperature sensor (9) records is greater than or equal to the temperature that first section regenerator inlet temperature sensor (10) records, when the temperature that records when evaporator temperature sensor (9) is greater than or equal to the temperature of first section regenerator inlet temperature sensor (10), further compare the temperature that first section regenerator inlet temperature sensor (10) and second section regenerator inlet temperature sensor (11) record, if the temperature that the temperature that first section regenerator inlet temperature sensor (10) records records less than second section regenerator inlet temperature sensor (11), further transfer the aperture of big expansion valve (3) by controller (8), until the temperature that first section regenerator inlet temperature sensor (10) records is greater than or equal to the temperature that second section regenerator inlet temperature sensor (11) records, when the temperature that records when first section regenerator inlet temperature sensor (10) is greater than or equal to the temperature that second section regenerator inlet temperature sensor (11) record, the further temperature that records of second section regenerator inlet temperature sensor (11) and the 3rd section regenerator inlet temperature sensor (12) relatively.If the temperature that the temperature that second section regenerator inlet temperature sensor (11) records records less than the 3rd section regenerator inlet temperature sensor (12), keep expansion valve (3) aperture constant, if the temperature that second section regenerator inlet temperature sensor (11) records is greater than or equal to the temperature that the 3rd section regenerator inlet temperature sensor (12) records, reduce the aperture of expansion valve (3) by controller (8), until the temperature that the temperature that second section regenerator inlet temperature sensor (11) records records less than the 3rd section regenerator inlet temperature sensor (12).
3. be the highly effective refrigeration system of working energetically the two-phase state according to claim 1 and 2 described evaporator outlet cold-producing mediums, it is characterized in that first section regenerator (5), second section regenerator (6), the 3rd section regenerator (7) all adopts two-tube outside wall surface contact heat exchanger, the heat exchange area of first section regenerator (5) and second section regenerator (6) is equal to half of the 3rd section regenerator (7), expansion valve (3) adopts step motor control formula expansion valve, controller (8) adopts single-chip microcomputer, evaporator temperature sensor (9), first section regenerator inlet temperature sensor (10), second section regenerator inlet temperature sensor (11), the 3rd section regenerator inlet temperature sensor (12) all adopts thermal resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100184779A CN100494829C (en) | 2004-05-20 | 2004-05-20 | Efficient refrigerating system with high-dryness two-phase state evaporator outlet refrigerant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100184779A CN100494829C (en) | 2004-05-20 | 2004-05-20 | Efficient refrigerating system with high-dryness two-phase state evaporator outlet refrigerant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1580670A true CN1580670A (en) | 2005-02-16 |
| CN100494829C CN100494829C (en) | 2009-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100184779A Expired - Fee Related CN100494829C (en) | 2004-05-20 | 2004-05-20 | Efficient refrigerating system with high-dryness two-phase state evaporator outlet refrigerant |
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| CN (1) | CN100494829C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1032852C2 (en) * | 2006-11-10 | 2008-05-14 | Antonie Bonte | Heat pump installation with compressor, includes internal heat exchangers arranged in series for heating suction gas |
| CN101842645B (en) * | 2007-11-30 | 2012-11-28 | 三菱电机株式会社 | Refrigeration cycle device |
| CN103062954A (en) * | 2013-01-25 | 2013-04-24 | 中国科学院广州能源研究所 | Solar-powered organic Rankine-steam compression air conditioner |
| WO2016095295A1 (en) * | 2014-12-19 | 2016-06-23 | 海信科龙电器股份有限公司 | Air conditioner circulating system and air conditioner |
| CN105890268A (en) * | 2015-02-13 | 2016-08-24 | 旺矽科技股份有限公司 | Cooling system with defrosting function |
| CN105890246A (en) * | 2015-02-13 | 2016-08-24 | 旺矽科技股份有限公司 | Adaptive Temperature Control System For Cooling Working Fluid |
| CN111854206A (en) * | 2019-04-28 | 2020-10-30 | 青岛海尔智能技术研发有限公司 | Refrigerator equipment, refrigerating system and control method of refrigerating system |
| CN113614469A (en) * | 2019-03-26 | 2021-11-05 | 富士通将军股份有限公司 | Air conditioner |
-
2004
- 2004-05-20 CN CNB2004100184779A patent/CN100494829C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1032852C2 (en) * | 2006-11-10 | 2008-05-14 | Antonie Bonte | Heat pump installation with compressor, includes internal heat exchangers arranged in series for heating suction gas |
| CN101842645B (en) * | 2007-11-30 | 2012-11-28 | 三菱电机株式会社 | Refrigeration cycle device |
| CN103062954A (en) * | 2013-01-25 | 2013-04-24 | 中国科学院广州能源研究所 | Solar-powered organic Rankine-steam compression air conditioner |
| WO2016095295A1 (en) * | 2014-12-19 | 2016-06-23 | 海信科龙电器股份有限公司 | Air conditioner circulating system and air conditioner |
| CN105890268A (en) * | 2015-02-13 | 2016-08-24 | 旺矽科技股份有限公司 | Cooling system with defrosting function |
| CN105890246A (en) * | 2015-02-13 | 2016-08-24 | 旺矽科技股份有限公司 | Adaptive Temperature Control System For Cooling Working Fluid |
| US10655893B2 (en) | 2015-02-13 | 2020-05-19 | Mpi Corporation | Cooling system capable of defrosting |
| CN105890268B (en) * | 2015-02-13 | 2020-07-10 | 旺矽科技股份有限公司 | Cooling system with defrosting function |
| CN113614469A (en) * | 2019-03-26 | 2021-11-05 | 富士通将军股份有限公司 | Air conditioner |
| CN113614469B (en) * | 2019-03-26 | 2022-09-09 | 富士通将军股份有限公司 | Air conditioner |
| CN111854206A (en) * | 2019-04-28 | 2020-10-30 | 青岛海尔智能技术研发有限公司 | Refrigerator equipment, refrigerating system and control method of refrigerating system |
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| Publication number | Publication date |
|---|---|
| CN100494829C (en) | 2009-06-03 |
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Effective date of registration: 20110120 Address after: 214028 Changjiang Road, Wuxi high tech Industrial Development Zone, Jiangsu, China, No. 32 Patentee after: York(Wuxi) Air-Conditioning Refrigeration Technology Co., Ltd. Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: Shanghai Jiao Tong University |
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