CN104344479B - A kind of cold storage energy-saving air conditioning system and its operation method - Google Patents
A kind of cold storage energy-saving air conditioning system and its operation method Download PDFInfo
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- CN104344479B CN104344479B CN201310311010.2A CN201310311010A CN104344479B CN 104344479 B CN104344479 B CN 104344479B CN 201310311010 A CN201310311010 A CN 201310311010A CN 104344479 B CN104344479 B CN 104344479B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The present invention relates to a kind of cold storage energy-saving air conditioning system and its operation method, including refrigerating circuit, the refrigerating circuit is made up of compressor, condenser, refrigeration restricting element and evaporator placed in series, a cold-accumulating box is set on pipeline between the condenser and refrigeration restricting element, cool storage medium is provided with the cold-accumulating box and cool-heat-exchanger is crossed, the cool-heat-exchanger of crossing is serially connected in the refrigerating circuit, and the air-conditioning system also includes being provided for the cool storage medium cold-storage loop of cold.Control mode of the present invention is simple and reliable, and cold-accumulating box is set by between condenser and refrigeration restricting element, and cold is stored by charge cycle, for the circulation of whole machine provides degree of supercooling, improves Energy Efficiency Ratio.Meanwhile, the system does not need by-passing part refrigerant and has saved the aspirated volume of press obtaining degree of supercooling, and making effective displacement of press increases, so as to ensure that Energy Efficiency Ratio higher.
Description
Technical field
The present invention relates to a kind of air-conditioning system, more particularly to a kind of cold storage energy-saving air conditioning system and its operation method, category
In air-conditioning technique field.
Background technology
With economic fast development, supply of electric power deficiency has turned into one and has compared distinct issues, in overall energy consumption
In, air conditioning energy consumption occupies larger portion, how to reduce air conditioning energy consumption, and the power shortages present to solution have relatively attaches most importance to
The meaning wanted.
The energy consumption of air-conditioning has obvious timeliness, and such as noon summer environment temperature is raised, now air-conditioning high load capacity fortune
Turn, Energy Efficiency Ratio reduction, energy consumption increases obvious, and at night, due to environment temperature reduction, air conditioner load is reduced, and energy consumption substantially subtracts
It is few.Therefore, the power consumption to air-conditioning is reasonably optimized, and is the maximally efficient means for reducing integral air conditioner energy consumption.Mesh
Before, generally optimized by the way of cold-storage, i.e., cold-storage is carried out when night, power consumption was relatively low, in peak of power consumption on daytime
Shi Jinhang lets cool.This method, agent for storage of coldness needs to be recycled to air conditioning terminal for room provides cold, it is necessary to increase power set,
Pump and corollary equipment etc. are relatively costly, in addition, from energy transmission angle analysis, cold needs to be transmitted to agent for storage of coldness by refrigerant,
Agent for storage of coldness is transmitted to space air again, increases relative to refrigerant direct-evaporation-type circulation irreversible loss.
The method of existing air conditioner cold accumulation, is to be divided into two by by the saturated liquid from condenser out, wherein a warp
After crossing expansion valve reducing pressure by regulating flow, exchanged heat with another branch road refrigerant by a heat exchanger, supercooling is realized, so as to make up refrigerating capacity
Deficiency, but the shortcoming of this method is, due to being changed to main branch refrigerant for the bypass branch refrigerant for throttling in advance
Branch road refrigerant is changed into gas from liquid after heat drop temperature, and this portion gas occupies the aspirated volume of press, makes the actual work(of compressor
Consumption increases.
The content of the invention
Present invention is primarily aimed at solving the above problems and not enough, there is provided a kind of control mode is simple, can be substantially improved
The cold storage energy-saving air conditioning system and its operation method of air-conditioning Energy Efficiency Ratio.
To achieve the above object, the technical scheme is that：
A kind of cold storage energy-saving air conditioning system, including refrigerating circuit, the refrigerating circuit is by compressor, condenser, refrigeration
Restricting element and evaporator are made up of placed in series, and one is set on the pipeline between the condenser and refrigeration restricting element
Cold-accumulating box, is provided with cool storage medium and excessively cool-heat-exchanger in the cold-accumulating box, and the cool-heat-exchanger excessively is serially connected in described
In refrigerating circuit, the air-conditioning system also includes being provided for the cool storage medium cold-storage loop of cold.
Further, the cold-storage returns compressors, condenser, cold-storage restricting element, cold-storage heat exchanger by pipeline
It is composed in series, the cold-storage heat exchanger is arranged in the cold-accumulating box.
Further, the cool storage medium is hydrate.
Further, the cool storage medium is sal glauberi Na2SO4·10H2O。
Further, the refrigeration restricting element and cold-storage restricting element are electric expansion valve.
Further, cool-heat-exchanger and the cold-storage heat exchanger excessively are snakelike back-bending type pipeline.
Further, four walls in the cold-accumulating box lay heat-insulation layer.
Another technical scheme of the invention is：
A kind of operation method of cold storage energy-saving air conditioning system, including：
Charge cycle runs, and starts compressor, cold-storage loop is connected, by condenser refrigerant out through cold-storage restricting element
The cold-storage heat exchanger entered in cold-accumulating box after throttling, low temperature refrigerant absorbs the heat of cool storage medium, makes cool storage medium cold-storage；
Kind of refrigeration cycle is run, and starts compressor, connects refrigerating circuit, closes cold-storage loop, and the cold-storage using cold-storage is situated between
Matter absorbs the refrigerant heat from condenser out, refrigerant cooling is obtained degree of supercooling, then enter steaming through restricting element throttling of freezing
Hair device, completes kind of refrigeration cycle；
Further, in kind of refrigeration cycle running, when the cold storage capacity of the cool storage medium runs out of, it is also turned on system
Cold loop and cold-storage loop, by cold-storage loop for cool storage medium is lowered the temperature, cool storage medium was again for the refrigerant in refrigerating circuit was provided
Cold degree.
Further, the charge cycle operation is preferably carried out when night, operating mode was relatively low.
To sum up content, a kind of cold storage energy-saving air conditioning system of the present invention and its operation method, control mode are simple
It is reliable, by between condenser and refrigeration restricting element, cold-accumulating box is set, cold is stored by charge cycle, it is whole machine circulation
Degree of supercooling is provided, Energy Efficiency Ratio is improve.Meanwhile, the system does not need by-passing part refrigerant to save pressure to obtain degree of supercooling
The aspirated volume of machine, making effective displacement of press increases, so as to ensure that Energy Efficiency Ratio higher.
Carry out cold-storage operate when can consume some electrical power, be preferably capable of night operating mode than it is relatively low when, enter
Now Energy Efficiency Ratio is higher for the operating of row cold-storage, is especially more suitable for less than the area of the electricity charge on daytime in the night electricity charge.The system can be with
Coordinated signals are carried out with machine system, is safeguarded without personal management, it is simple and reliable.
Brief description of the drawings
Fig. 1 is charge cycle schematic diagram of the present invention；
Fig. 2 is kind of refrigeration cycle schematic diagram of the present invention；
Fig. 3 is kind of refrigeration cycle of the present invention and charge cycle while the schematic diagram for carrying out；
Fig. 4 is the pressure enthalpy comparison diagram before and after the present invention adds charge cycle.
As shown in Figures 1 to 4, compressor 1, condenser 2 crosses cool-heat-exchanger 3, and freeze restricting element 4, and evaporator 5 stores
Cold restricting element 6, cold-storage heat exchanger 7, cold-accumulating box 8, cool storage medium 9.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
As shown in Figure 1 to Figure 3, a kind of cold storage energy-saving air conditioning system that the present invention is provided, including compressor 1, condenser
2nd, cool-heat-exchanger 3, refrigeration restricting element 4, evaporator 5, cold-storage restricting element 6, cold-storage heat exchanger 7, cold-accumulating box 8 are crossed.
Wherein, pipeline string is passed through by compressor 1, condenser 2, cool-heat-exchanger 3, refrigeration restricting element 4, evaporator 5 excessively
Joint group is into refrigerating circuit.
Cold-storage is constituted by placed in series and is returned by compressor 1, condenser 2, cold-storage restricting element 6, cold-storage heat exchanger 7
Road.
Refrigeration restricting element 4 and cold-storage restricting element 6 use electric expansion valve, and refrigerating circuit and cold-storage can be controlled to return
The break-make on road, can also adjust the flow of refrigerant.
Cold-accumulating box 8 is arranged between condenser 2 and refrigeration restricting element 4, and cold-accumulating box 8 includes a housing, in housing
Filled with cool storage medium 9, cross cool-heat-exchanger 3 and cold-storage heat exchanger 7 is arranged in the housing of cold-accumulating box 8, excessively cold and hot friendship
The import and export of parallel operation 3 and cold-storage heat exchanger 7 are respectively connected in the pipeline in refrigerating circuit and cold-storage loop.Cool storage medium 9 is entering
During phase transformation between row solid-liquid, heat exchange 7 can be carried out with the refrigerant crossed in cool-heat-exchanger 3 and cold-storage heat exchanger 7, make refrigerant
Neither endothermic nor exothermic.
Cool storage medium 9 uses hydrate, in the present embodiment, it is preferred to use sal glauberi Na2SO4·10H2O, the hydration
About 30 DEG C of thing phase transition temperature, about 40 DEG C of condensator outlet refrigerant temperature, equivalent to there are 10 DEG C of temperature difference, while steamed higher than refrigerant again
About 8 DEG C of temperature of hair, heat transfer temperature difference is suitable.This hydrate has cold storage capacity higher, low cost simultaneously, and is widely used in cold-storage industry
Technology is more ripe.Cool storage medium 9 can at low temperature absorb and store a large amount of colds, and can release a large amount of when temperature is higher
Cold, the long period keeps the low temperature environment of itself and surrounding a small range.One layer of heat preservation is also laid with four walls of cold-accumulating box 8
Layer, it is to avoid loss of refrigeration capacity.
Cool-heat-exchanger 3 and cold-storage heat exchanger 7 are crossed using snakelike back-bending type pipeline, can so be significantly increased with
Contact area between cool storage medium 9, so as to improve heat exchange efficiency, cool-heat-exchanger 3 and cold-storage heat exchanger 7 are used and led excessively
Hot coefficient copper pipe higher.This cold-accumulating box 8 has simple structure, the characteristics of stable type is high, and meanwhile it is with low cost, use will not be increased
Bear at family.
Describe the operation method of the cold storage energy-saving air conditioning system in detail below according to Fig. 1 to Fig. 3:
The method includes three kinds of operational modes：
As shown in figure 1, charge cycle operational mode：
Start compressor 1, open cold-storage restricting element 6, close refrigeration restricting element 4, that is, connect cold-storage loop, disconnect system
Cold loop.
Refrigerant enters condenser 2 after being discharged by compressor 1, and heat exchange is carried out with outdoor air in condenser 2, and refrigerant is cold
It is HTHP saturated liquid to coagulate, and is throttled through cold-storage restricting element 6 by the liquid coolant out of condenser 2, after reducing pressure by regulating flow
Liquid coolant enter cold-accumulating box 8 in cold-storage heat exchanger 7, now cold-storage heat exchanger 7 equivalent to evaporator effect, it is low
The liquid coolant of temperature carries out heat exchange in cold-storage heat exchanger 7 and cool storage medium 9, absorbs the heat of cool storage medium 9, cold-storage is situated between
Matter 9 is undergone phase transition, and solid is changed into from liquid, and cool storage medium 9 stores cold.After refrigerant evaporates in cold-storage heat exchanger 7, gas
Refrigerant return completes charge cycle to compressor 1.
As shown in Fig. 2 kind of refrigeration cycle operational mode：
Start compressor 1, close cold-storage restricting element 6, open refrigeration restricting element 4, that is, connect refrigerating circuit, disconnect and storing
Cold loop.
Refrigerant enters condenser 2 after being discharged by compressor 1, and heat exchange is carried out with outdoor air in condenser 2, and refrigerant is cold
It is HTHP saturated liquid to coagulate, and cool-heat-exchanger 3 is crossed by what the liquid coolant out of condenser 2 entered in cold-accumulating box 8, in mistake
Heat exchange is carried out with cool storage medium 9 in cool-heat-exchanger 3, because foregoing charge cycle runs, now cool storage medium 9 is solid
State, and stored substantial amounts of cold, the heat that cool storage medium 9 absorbs refrigerant is undergone phase transition, and liquid is changed into from solid, refrigerant with
Temperature reduction after the heat exchange of cool storage medium 9, obtains degree of supercooling, and the liquid coolant with certain degree of supercooling enters refrigeration restricting element
4 throttlings, evaporator 5 is entered through the liquid coolant after reducing pressure by regulating flow, and the refrigerant in evaporator 5 carries out hot friendship with room air
Change, be indoor environment cooling, the cold media gas after evaporation are back in compressor 1, complete kind of refrigeration cycle.
As shown in figure 3, the pattern that refrigeration and cold-storage run simultaneously：
In kind of refrigeration cycle running, when the cold storage capacity of cool storage medium 9 runs out of, open cold-storage restricting element 6 and connect
Logical cold-storage loop.Two branch roads are divided into by the liquid coolant out of condenser 2, a branch road throttles through cold-storage restricting element 6, throttled
The cold-storage heat exchanger 7 that liquid coolant afterwards enters in cold-accumulating box 8, is that cool storage medium 9 is lowered the temperature, meanwhile, cool storage medium 9 is another
The liquid coolant 3 for entering cool-heat-exchanger 3 in branch road is lowered the temperature, for the refrigerant for participating in kind of refrigeration cycle provides degree of supercooling,
Cool storage medium 9 now plays a part of equivalent to refrigerating medium.Cold-storage heat exchanger 7 and evaporator 5 gas coolant out are returned
It flow in compressor 1.
As shown in figure 4, wherein left hand view is normal schematic diagram of refrigerating, in the pressure-enthalpy chart, process of refrigerastion is divided into 4 mistakes
Journey, respectively 1 → 2,2 → 3,3 → 4,4 → 1, respectively compressor work refrigerant increasing temperature and pressure, condenser condensation heat release, section
Stream step-down, wherein evaporation endothermic, unit interval coolant refrigeration amount are h1- h2.
Such as the right part of flg in Fig. 4, to add the schematic diagram after charge cycle, in the pressure-enthalpy chart, divide 5 processes, respectively
It is 1 → 2,2 → 3,3 → 3 ", 3 " → 4 ", 4 " → 1, respectively compressor work, condenser condensation heat release, cold-storage loop provides
Supercooling, reducing pressure by regulating flow, evaporator evaporation heat absorption,.
Due to super cooled sect 3 → 3 " presence, from condenser 2 out saturated liquid temperature reduction, by restricting element
After reducing pressure by regulating flow, refrigerant enthalpy reduction h4-h4 ", evaporation endothermic amount increases, and the evaporation endothermic amount increase in the unit interval is
H3-h3 "=h4-h4 ", and compressor consumption power does not have change, is h2-h1, the whole machine Energy Efficiency Ratio of general refrigerating cycle is E=(h1-
H4)/(h2-h1), and the whole machine Energy Efficiency Ratio after charge cycle is added for E=(h1-h4 ")/(h2-h1), Energy Efficiency Ratio incrementss are △
E= (h4-h4”) /(h2-h1)。
Carry out cold-storage operate when can consume some electrical power, be preferably capable of night operating mode than it is relatively low when, enter
Row cold-storage is operated, and now Energy Efficiency Ratio is higher, is especially more suitable for less than the area of the electricity charge on daytime in the night electricity charge.The cold accumulation system
Coordinated signals can be carried out with machine system, without special messenger's pipe, controlled simple and reliable.
Due to the increase of degree of supercooling, Energy Efficiency Ratio is improved the system, when especially noon summer environment temperature is higher, air-conditioning mechanism
Refrigeration duty is increased, and Energy Efficiency Ratio can decline, and refrigerating capacity reduction, the present invention increases degree of supercooling due to cool storage medium released cold quantity, from
And refrigerating capacity increases, Energy Efficiency Ratio lifting.Simultaneously again because not needing by-passing part refrigerant to save press obtaining degree of supercooling
Aspirated volume, making effective displacement of press increases, so as to ensure that Energy Efficiency Ratio higher.
As described above, the plan content with reference to given by accompanying drawing, can derive similar technical scheme.In every case it is not de-
From the content of technical solution of the present invention, any simple modification made to above example according to technical spirit of the invention, etc.
With change and modification, still fall within the range of technical solution of the present invention.
Claims (9)
1. a kind of cold storage energy-saving air conditioning system, including refrigerating circuit, the refrigerating circuit is by compressor, condenser, refrigeration section
Fluid element and evaporator are made up of placed in series, it is characterised in that：Pipe between the condenser and refrigeration restricting element
One cold-accumulating box is set on road, cool storage medium is provided with the cold-accumulating box and cool-heat-exchanger is crossed, it is described to cross cool-heat-exchanger
It is serially connected in the refrigerating circuit, the air-conditioning system also includes being provided for the cool storage medium cold-storage loop of cold, described
Cold-storage returns compressors, condenser, cold-storage restricting element, cold-storage heat exchanger and is made up of placed in series, the cold-storage heat
Exchanger is arranged in the cold-accumulating box.
2. cold storage energy-saving air conditioning system according to claim 1, it is characterised in that：The cool storage medium is hydrate.
3. cold storage energy-saving air conditioning system according to claim 2, it is characterised in that：The cool storage medium is ten water sulfuric acid
Sodium Na2SO4·10H2O。
4. cold storage energy-saving air conditioning system according to claim 1, it is characterised in that：Refrigeration restricting element and the cold-storage
Restricting element is electric expansion valve.
5. cold storage energy-saving air conditioning system according to claim 1, it is characterised in that：It is described to cross cool-heat-exchanger and described
Cold-storage heat exchanger is snakelike back-bending type pipeline.
6. cold storage energy-saving air conditioning system according to claim 1, it is characterised in that：Laid in four walls of the cold-accumulating box
Heat-insulation layer.
7. a kind of operation method of cold storage energy-saving air conditioning system, it is characterised in that including：
Charge cycle runs, and starts compressor, connects cold-storage loop, is throttled through cold-storage restricting element by condenser refrigerant out
The cold-storage heat exchanger for entering in cold-accumulating box afterwards, low temperature refrigerant absorbs the heat of cool storage medium, makes cool storage medium cold-storage；
Kind of refrigeration cycle is run, and starts compressor, connects refrigerating circuit, closes cold-storage loop, is inhaled using the cool storage medium of cold-storage
The refrigerant heat from condenser out is received, refrigerant is lowered the temperature and is obtained degree of supercooling, then enter evaporator through restricting element throttling of freezing,
Complete kind of refrigeration cycle.
8. operation method according to claim 7, it is characterised in that：In kind of refrigeration cycle running, when the cold-storage
When the cold storage capacity of medium runs out of, refrigerating circuit and cold-storage loop are also turned on, by cold-storage loop for cool storage medium is lowered the temperature, cold-storage
Medium is again for the refrigerant in refrigerating circuit provides degree of supercooling.
9. operation method according to claim 7, it is characterised in that：Charge cycle operation preferably night operating mode compared with
Carried out when low.
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| CN201310311010.2A CN104344479B (en) | 2013-07-23 | 2013-07-23 | A kind of cold storage energy-saving air conditioning system and its operation method |
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| CN105571198B (en) * | 2015-12-15 | 2017-12-26 | 同济大学 | A kind of high-efficiency refrigerating system based on cold-storage supercooling |
| TWI658238B (en) * | 2016-08-12 | 2019-05-01 | 國立勤益科技大學 | Split energy storage system and method |
| CN107014017B (en) * | 2017-05-19 | 2022-09-23 | 深圳佩尔优科技有限公司 | Cold storage system and control method |
| CN109114850A (en) * | 2018-09-18 | 2019-01-01 | 郑州云海信息技术有限公司 | A kind of refrigeration system apparatus for supercooling |
| CN109107618A (en) * | 2018-09-21 | 2019-01-01 | 深圳市大稳科技有限公司 | Cool-storage type temperature control chamber and control method |
| CN109294523A (en) * | 2018-10-18 | 2019-02-01 | 浙江大学山东工业技术研究院 | A kind of cold accumulation air-conditioner |
| CN110039974B (en) * | 2019-05-22 | 2022-02-18 | 上海交通大学 | Thermal comfort adjusting system for automobile passenger compartment based on phase change and temperature-sensing atomization technology |
| CN112880073A (en) * | 2019-11-29 | 2021-06-01 | 广东美的制冷设备有限公司 | Air conditioner, method for predicting remaining cold storage time, and computer-readable storage medium |
| CN114688702B (en) * | 2022-04-27 | 2023-08-04 | 美的集团武汉暖通设备有限公司 | Air conditioner control method and device and air conditioner |
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| CN1056685C (en) * | 1996-11-10 | 2000-09-20 | 中国科学技术大学 | Refrigerating/heating and cold storage/heat storage system for air conditioner using counterflow overcooler |
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| EP0449641A2 (en) * | 1990-03-30 | 1991-10-02 | Mitsubishi Denki Kabushiki Kaisha | Air conditioning system |
| EP0485203A1 (en) * | 1990-11-08 | 1992-05-13 | Mitsubishi Denki Kabushiki Kaisha | Air conditioning system |
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| CN104344479A (en) | 2015-02-11 |
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