CN103486754A - Energy-saving middle temperature refrigerant/middle temperature refrigerant cascade refrigeration system - Google Patents
Energy-saving middle temperature refrigerant/middle temperature refrigerant cascade refrigeration system Download PDFInfo
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- CN103486754A CN103486754A CN201310376749.1A CN201310376749A CN103486754A CN 103486754 A CN103486754 A CN 103486754A CN 201310376749 A CN201310376749 A CN 201310376749A CN 103486754 A CN103486754 A CN 103486754A
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Abstract
The invention discloses an energy-saving middle temperature refrigerant/middle temperature refrigerant cascade refrigeration system, which comprises a high-temperature level refrigeration cycle and a low-temperature level refrigeration cycle, wherein heat exchange is carried out by virtue of a condensation evaporator. The high-temperature level refrigeration cycle is additionally provided with a high-temperature level refrigeration branch. The high-temperature level refrigeration cycle and the low-temperature level refrigeration cycle adopt the same middle temperature refrigerant, and share the same evaporator, and switching is realized through the opening and closing of an electromagnetic valve. The cascade refrigeration system disclosed by the invention has the remarkable effects that the refrigeration coefficient is high, cold supply can be realized respectively under the high-temperature level working condition and the low-temperature level working condition, energy can be saved, the operating cost can be lowered, and the use ratio of equipment can be improved.
Description
Technical field
The present invention relates to environmental-test facility and freezer refrigerating field, be specially the energy-conservation middle temperature cold-producing medium of total temperature operating mode more than a kind of-60 ℃/middle temperature cold-producing medium cascade refrigeration system.
Background technology
In the steam compression type refrigeration circulation, restriction due to kind of refrigeration cycle compression ratio and cold-producing medium thermophysical property, the low temperature of can only obtain-20--40 of single stage compress kind of refrigeration cycle commonly used ℃, if the low temperature of acquisition-40--60 ℃, the Two-stage Compression kind of refrigeration cycle of warm cold-producing medium in adopt more, when needs obtain the low temperature below-50 ℃, the kind of refrigeration cycle of warm cold-producing medium and low-temperature refrigerant overlapping in employing; Many scholar's research results show ,-40--60 ℃ warm area, adopt the refrigerating efficiency of double-clicking the compression refrigeration circulation to circulate higher than cascade refrigeration, and cascade refrigeration circulates in, warm area refrigeration below-60 ℃ can more have superiority.
In the high/low temperature environmental simulation testing equipment, because temperature test point will often change.Double-stage compressive refrigerating system and cascade refrigeration system need to start two-stage compressor always and just meet refrigeration, and unnecessary refrigeration need to provide heating power to go balance, have so just caused larger energy waste.At present, cascade refrigeration system can carry out the high temperature level by the mode of double evaporators and the low temperature level is freezed respectively, but can cause like this improving the problem of equipment investment cost and the increase of automatic control point; In addition, cascade refrigeration system adopts low-temperature refrigerant, can all be vaporizated into superheated steam at normal temperatures, brings potential safety hazard to whole refrigeration system.
Summary of the invention
The problem existed for prior art, the present invention, in conjunction with Two-stage Compression refrigeration and cascade refrigeration advantage, provides a kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, to reach the saving energy, reduces the purpose of equipment investment and raising utilization rate of equipment and installations.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, comprise high temperature level kind of refrigeration cycle and the low temperature level kind of refrigeration cycle of carrying out heat exchange by condenser/evaporator, it is characterized in that: high temperature level kind of refrigeration cycle also has additional high temperature level refrigeration branch road.
Described a kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: described high temperature level kind of refrigeration cycle comprises high temperature stage compressor, high temperature level oil eliminator, high temperature level water storage type water condenser, high temperature level device for drying and filtering, high temperature level the first magnetic valve, high temperature level the first expansion valve, the condenser/evaporator connected successively by pipeline, and the other end of condenser/evaporator is connected to the suction end of high temperature stage compressor.
Described a kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: described low temperature level kind of refrigeration cycle is: the outlet of low temperature stage compressor connects low temperature level water precooler, low temperature level oil eliminator, condenser/evaporator, low temperature level fluid reservoir, low temperature level device for drying and filtering, magnetic valve, expansion valve, evaporimeter successively, and the outlet of evaporimeter is connected with low temperature stage compressor suction end.
Described a kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: described high temperature level refrigeration branch road for from high temperature level fluid reservoir cold-producing medium out after high temperature level the second magnetic valve, high temperature level the second expansion valve, enter again evaporimeter 18, on the pipeline of crossing between high temperature level the 3rd magnetic valve access condenser/evaporator and high temperature stage compressor.
Described a kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system is characterized in that: high temperature level kind of refrigeration cycle and low temperature level kind of refrigeration cycle cold-producing medium used are the same cold-producing medium.
Described a kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system is characterized in that: high temperature level kind of refrigeration cycle and low temperature level kind of refrigeration cycle share same evaporimeter.
Advantage of the present invention is: (1). in-60 ℃ of-5 ℃ of temperature ranges, the coefficient of refrigerating performance of middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system is higher than double-stage compressive refrigerating system and cascade refrigeration system.
(2). can adopt low temperature level operating mode that cold is provided, also can only start the high temperature stage compressor provides cold, is particularly suitable for the high/low temperature environmental simulation experimental facilities that wide warm area changes and need accurate temperature controlling, plays and reduces plant capacity consumption, energy-conservation effect.
(3). low temperature level kind of refrigeration cycle and high temperature level refrigeration branch road shares an evaporimeter, and the keying by magnetic valve realizes switching, has reduced equipment investment cost and the quantity at control point automatically, has improved the utilization rate of equipment.
The accompanying drawing explanation
Fig. 1 is the energy-conservation middle temperature cold-producing medium of the present invention/middle temperature cold-producing medium cascade refrigeration system structural principle schematic diagram.
The specific embodiment
As shown in Figure 1.The present invention includes high temperature level kind of refrigeration cycle 01 and low temperature level kind of refrigeration cycle 02, high temperature level kind of refrigeration cycle includes high temperature stage compressor 1, high temperature level oil eliminator 2, high temperature level water storage type water condenser 3, high temperature level device for drying and filtering 4, high temperature level the first magnetic valve 5, high temperature level the first expansion valve 6, the condenser/evaporator 7 connected successively by pipeline, and the other end of condenser/evaporator 7 is connected to the suction end of high temperature stage compressor 1.Low temperature level kind of refrigeration cycle is, 11 outlets of low temperature stage compressor connect low temperature level water precooler 12, low temperature level oil eliminator 13, condenser/evaporator 7, low temperature level fluid reservoir 14, low temperature level device for drying and filtering 15, magnetic valve 16, expansion valve 17, evaporimeter 18 successively, and the outlet of evaporimeter 18 is connected with low temperature stage compressor suction end.In addition, set up high temperature level feed flow branch road in high temperature level kind of refrigeration cycle.
In the present invention, high temperature level refrigeration branch road comprises high temperature level the second magnetic valve 8, high temperature level the second expansion valve 9, evaporimeter 18 and high temperature level the 3rd magnetic valve 10 connected successively, wherein between high temperature level the second magnetic valve access high temperature level device for drying and filtering and high temperature level the first magnetic valve on pipeline; On pipeline between high temperature level the 3rd magnetic valve 10 access condenser/evaporators 7 and high temperature stage compressor 1.
This refrigeration system course of work of the present invention is as follows:
1.-15 ℃ and refrigeration more than-15 ℃: adopt high temperature level operating mode cooling, cold-producing medium enters high temperature level oil eliminator after the compression of high temperature stage compressor, then enter high temperature level water storage type water condenser cooling, through the high temperature level, the second expansion valve throttling enters evaporimeter again, absorb the heat of operating room, be inhaled into the high temperature stage compressor after being vaporized into superheated vapor, complete circulation.The low temperature stage compressor is not worked.
2.-60 ℃--the refrigeration between 15 ℃: adopt low temperature level operating mode cooling, high temperature level kind of refrigeration cycle 01 provides cold by compression, condensation, throttling, evaporation process for condenser/evaporator 7; Cold-producing medium after the compression of low temperature stage compressor enters low temperature level water precooler, then enter low temperature level oil eliminator, then be cooled through condenser/evaporator, then enter through reducing pressure by regulating flow the heat that evaporimeter absorbs workplace, be inhaled into the low temperature stage compressor after being vaporized into superheated vapor, complete circulation.
3. close high temperature level the first magnetic valve, open high temperature level the second magnetic valve and high temperature level the 3rd magnetic valve, realize that the high temperature level supplies the operating mode cooling, open high temperature level the first magnetic valve, open high temperature level the second magnetic valve and high temperature level the 3rd magnetic valve and realize low temperature level operating mode refrigeration.
Take refrigerating capacity as 40KW, cold-producing medium is R404A, and condensation temperature is 40 ℃, and it is example that evaporating temperature is-50 ℃, middle temperature cold-producing medium of the present invention/middle temperature cold-producing medium cascade refrigeration system and double-stage compressive refrigerating system are carried out to coefficient of refrigerating performance, COP, shaft power and calculated, the results are shown in Table 1.
Suppose that refrigerant system is at given operating mode operation 24h, the consumption of conventional double-stage compressive refrigerating system energy is 35.2*24=844.8kw.The present invention reaches refrigeration more than-15 ℃ at-15 ℃, only need carry out high temperature level operating mode refrigeration, and the consumption energy consumption is 16.2*24=388.8kw;-60 ℃--during 15 ℃ of refrigeration, energy consumption is: 24.61*24=590.64kw.
By comparing with conventional double-stage compressive refrigerating system, the energy-conservation middle temperature cold-producing medium of the present invention/middle temperature cold-producing medium cascade refrigeration system energy-saving effect is remarkable:
When-15 ℃ and while freezing more than-15 ℃, energy-conservation ratio: (844.8-388.8)/844.8*100%=53.98%
When-60--15 ℃ of refrigeration, energy-conservation ratio: (844.8-590.64)/844.8*100%=30.09%
Claims (6)
1. energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, comprise high temperature level kind of refrigeration cycle and the low temperature level kind of refrigeration cycle of carrying out heat exchange by condenser/evaporator, it is characterized in that: high temperature level kind of refrigeration cycle also has additional high temperature level refrigeration branch road.
2. a kind of energy-conservation middle temperature cold-producing medium according to claim 1/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: described high temperature level kind of refrigeration cycle comprises high temperature stage compressor, high temperature level oil eliminator, high temperature level water storage type water condenser, high temperature level device for drying and filtering, high temperature level the first magnetic valve, high temperature level the first expansion valve, the condenser/evaporator connected successively by pipeline, and the other end of condenser/evaporator is connected to the suction end of high temperature stage compressor.
3. a kind of energy-conservation middle temperature cold-producing medium according to claim 1/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: described low temperature level kind of refrigeration cycle is: the outlet of low temperature stage compressor connects low temperature level water precooler, low temperature level oil eliminator, condenser/evaporator, low temperature level fluid reservoir, low temperature level device for drying and filtering, magnetic valve, expansion valve, evaporimeter successively, and the outlet of evaporimeter is connected with low temperature stage compressor suction end.
4. a kind of energy-conservation middle temperature cold-producing medium according to claim 1/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: described high temperature level refrigeration branch road for from high temperature level fluid reservoir cold-producing medium out after high temperature level the second magnetic valve, high temperature level the second expansion valve, enter again evaporimeter 18, on the pipeline of crossing between high temperature level the 3rd magnetic valve access condenser/evaporator and high temperature stage compressor.
5. a kind of energy-conservation middle temperature cold-producing medium according to claim 1/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: high temperature level kind of refrigeration cycle and low temperature level kind of refrigeration cycle cold-producing medium used are the same cold-producing medium.
6. a kind of energy-conservation middle temperature cold-producing medium according to claim 1/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: high temperature level kind of refrigeration cycle and low temperature level kind of refrigeration cycle share same evaporimeter.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501406A (en) * | 2014-12-29 | 2015-04-08 | 克莱门特捷联制冷设备(上海)有限公司 | Multistage air source heat pump for producing high temperature hot water |
| CN104697222A (en) * | 2015-03-06 | 2015-06-10 | 浪潮电子信息产业股份有限公司 | Cloud server low temperature testing system with high calorific value |
| CN104807276A (en) * | 2015-05-07 | 2015-07-29 | 天津商业大学 | Three-stage step cooling super-low temperature cold store |
| CN105004088A (en) * | 2015-07-31 | 2015-10-28 | 广东申菱空调设备有限公司 | Cascaded water chilling unit for dual purposes of intermediate temperature and low temperature |
| CN105004089A (en) * | 2015-07-31 | 2015-10-28 | 广东申菱空调设备有限公司 | Cascaded unit used for both medium-high temperature cold storage house and low temperature cold storage house |
| CN105665053A (en) * | 2016-03-30 | 2016-06-15 | 天津亭华科技有限公司 | Low constant temperature device for cascade type high-low temperature test chamber |
| CN106895640A (en) * | 2017-03-09 | 2017-06-27 | 天津商业大学 | A kind of superposition type is segmented quick-frozen and cold and heat combined supply instant freezer |
| CN107631507A (en) * | 2017-11-02 | 2018-01-26 | 珠海格力电器股份有限公司 | Air-conditioning device and refrigeration storage system control method |
| CN109140811A (en) * | 2018-10-11 | 2019-01-04 | 武汉巨力鼎兴冷链股份有限公司 | A kind of freezer circulatory system with high and low temperature refrigeration handoff functionality |
| CN111197873A (en) * | 2020-01-14 | 2020-05-26 | 无锡溥汇机械科技有限公司 | Wide-temperature-range overlapping precise temperature control heat exchange system and control method thereof |
| CN112984850A (en) * | 2021-03-23 | 2021-06-18 | 上海理工大学 | Energy-saving high-low temperature environment test box refrigerating system |
| CN116123747A (en) * | 2023-04-14 | 2023-05-16 | 云南道精制冷科技有限责任公司 | Overlapping type cold and hot source unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104697222A (en) * | 2015-03-06 | 2015-06-10 | 浪潮电子信息产业股份有限公司 | Cloud server low temperature testing system with high calorific value |
| CN104807276A (en) * | 2015-05-07 | 2015-07-29 | 天津商业大学 | Three-stage step cooling super-low temperature cold store |
| CN105004088A (en) * | 2015-07-31 | 2015-10-28 | 广东申菱空调设备有限公司 | Cascaded water chilling unit for dual purposes of intermediate temperature and low temperature |
| CN105004089A (en) * | 2015-07-31 | 2015-10-28 | 广东申菱空调设备有限公司 | Cascaded unit used for both medium-high temperature cold storage house and low temperature cold storage house |
| CN105665053A (en) * | 2016-03-30 | 2016-06-15 | 天津亭华科技有限公司 | Low constant temperature device for cascade type high-low temperature test chamber |
| CN106895640A (en) * | 2017-03-09 | 2017-06-27 | 天津商业大学 | A kind of superposition type is segmented quick-frozen and cold and heat combined supply instant freezer |
| CN107631507A (en) * | 2017-11-02 | 2018-01-26 | 珠海格力电器股份有限公司 | Air-conditioning device and refrigeration storage system control method |
| CN107631507B (en) * | 2017-11-02 | 2023-06-20 | 珠海格力电器股份有限公司 | Air conditioner and control method of refrigeration house system |
| CN109140811A (en) * | 2018-10-11 | 2019-01-04 | 武汉巨力鼎兴冷链股份有限公司 | A kind of freezer circulatory system with high and low temperature refrigeration handoff functionality |
| CN111197873A (en) * | 2020-01-14 | 2020-05-26 | 无锡溥汇机械科技有限公司 | Wide-temperature-range overlapping precise temperature control heat exchange system and control method thereof |
| CN112984850A (en) * | 2021-03-23 | 2021-06-18 | 上海理工大学 | Energy-saving high-low temperature environment test box refrigerating system |
| CN116123747A (en) * | 2023-04-14 | 2023-05-16 | 云南道精制冷科技有限责任公司 | Overlapping type cold and hot source unit |
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Effective date of registration: 20180723 Address after: 230088 658 Wangjiang West Road, Hefei high tech Zone, Anhui Patentee after: CHINA ELECTRONICS TECHNOLOGY Group CORPORATION NO 16 INSTITUTE Address before: 230088 Haitang Road, Hefei hi tech Zone, Anhui Province, No. 189 Patentee before: ANHUI YIRUI CRYOGENIC ENERGY TECHNOLOGY Co.,Ltd. |
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