CN114198951B - Double-effect integrated refrigerating unit with natural cooling function and refrigerating method thereof - Google Patents
Double-effect integrated refrigerating unit with natural cooling function and refrigerating method thereof Download PDFInfo
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- CN114198951B CN114198951B CN202110601883.1A CN202110601883A CN114198951B CN 114198951 B CN114198951 B CN 114198951B CN 202110601883 A CN202110601883 A CN 202110601883A CN 114198951 B CN114198951 B CN 114198951B
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a double-effect integrated refrigerating unit with natural cooling and a refrigerating method thereof, comprising a waterway pipeline, a control system, a compressor refrigerating system and a natural cooling system, wherein the compressor refrigerating system comprises a compressor, an oil separator, a liquid storage tank, an expansion valve and an evaporator which are arranged on the refrigerant pipeline, the compressor and the evaporator are communicated through the refrigerator pipeline to form a loop, and the control system is respectively connected with the natural cooling system and the compressor refrigerating system; the natural cooling system comprises a natural cooling device and an evaporation cooling device, wherein the natural cooling device is arranged on a waterway pipeline, and the evaporation cooling device sprays the natural cooling device; chilled water flows through the natural cooling device and then flows through the evaporator; the compressor refrigeration system and/or the natural cooling system work under certain conditions. So set up, adopt different cooling methods to cool down chilled water according to different conditions, the energy consumption of reduction unit that like this can be very big reduces the load of compressor.
Description
Technical Field
The invention relates to the field of agriculture, in particular to a double-effect integrated refrigerating unit with natural cooling and a refrigerating method thereof.
Background
At present, the energy efficiency requirements of the edible fungi factory planting industry on a large-sized water chilling unit are higher and higher, and the water chilling unit with high energy consumption can be gradually eliminated by the market. In the edible fungus industry, a strong cooling room requires a unit to quickly cool the indoor temperature from 70 ℃ to 15 ℃, and at present, a water cooling screw water chilling unit is commonly adopted in the industry to provide cold water and combine indoor air supply equipment to cool the strong cooling room, so that the energy consumption is high; the evaporating temperature of the unit is too high, the limit of the compressor is exceeded, the fault rate of the compressor is high, and the stability of the unit is poor.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a double-effect refrigerating unit with lower energy consumption and a refrigerating method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the system comprises a waterway pipeline and a compressor refrigerating system, wherein the compressor refrigerating system comprises a compressor, an oil separator, a liquid storage tank, an expansion valve and an evaporator which are sequentially arranged on a refrigerant pipeline, the compressor and the evaporator are communicated through the refrigerator pipeline to form a loop, the refrigerant circulates in the compressor refrigerating system and is in a low-temperature low-pressure saturated liquid state in the evaporator, the unit also comprises a natural cooling system and a control system, and the control system is respectively connected with the natural cooling system and the compressor refrigerating system; the natural cooling system comprises a natural cooling device and an evaporation cooling device, the natural cooling device is arranged on a waterway pipeline, the evaporation cooling device comprises a water tank, a water supplementing pump and a spraying device, the water supplementing pump pumps water in the water tank to the spraying device, and the natural cooling device is sprayed through the spraying device; the water way pipeline is provided with a water inlet and a water outlet, the water way pipeline is provided with a chilled water pump, the water way pipeline passes through the evaporator, the chilled water pump pumps chilled water from the water inlet to the water way pipeline, the chilled water pump drives the chilled water to flow in the water way pipeline, the chilled water is output from the water outlet, and the chilled water flows through the natural cooling device and then flows through the evaporator. So set up, advance cooling down through spray water to chilled water before the compressor refrigerates, then use the compressor refrigeration to chilled water cooling down, like this, the energy consumption of reduction unit that can be very big reduces the load of compressor, promotes the life of compressor.
Preferably, a part of the sections in the refrigerant line is passed through an evaporative cooling device, which sprays the refrigerant line through a spraying device. By the arrangement, the cooling agent can be precooled before being changed into low-temperature low-pressure liquid, so that the energy consumption of a unit can be reduced, and the load of a compressor can be reduced.
Preferably, the pre-cooled section of the refrigerant line is located between the oil separator and the liquid storage tank.
Preferably, the water path pipeline is connected with a switching pipeline, chilled water can pass through the switching pipeline and directly pass through the evaporator, a first valve is arranged on the switching pipeline, a second valve is arranged on the water path pipeline, and the second valve is positioned between the switching pipeline and the natural cooling device. The setting is so convenient to switch the flow channel of the chilled water, so that the chilled water can quickly enter the evaporator to realize cooling.
Preferably, the first valve and the second valve are all electric ball valves. So arranged, the units are controlled respectively.
Preferably, the water tank is positioned below the natural cooler, and the top of the water tank is provided with an opening; the evaporation cooling device further comprises a plurality of groups of fans arranged above the natural cooler, and the fans are started to extract heat in the evaporation cooling device. The device can reduce the temperature in the evaporation cooling device, and ensures the stable operation of the unit while assisting in cooling.
Preferably, the compressor is a screw compressor.
The application method of the double-effect integrated refrigerating unit comprises the following steps: detecting backwater temperature and outdoor temperature, and calculating the temperature difference between the backwater temperature and the outdoor temperature; if the temperature difference is lower than the numerical value in the preset range, independently starting a natural cooling system; if the temperature difference is larger than the preset range, sequentially starting a natural cooling system and a compressor cooling system; and if the temperature difference is within the preset range, independently starting the compressor refrigerating system. By the arrangement, different cooling modes can be adopted under different conditions, so that the energy consumption of a unit is reduced, and the load of a compressor is reduced.
Preferably, the preset range of the temperature difference is [ -5 ℃; +5℃ ].
Preferably, when the temperature difference between the backwater temperature and the outdoor temperature is greater than or equal to 10 ℃, the natural cooling system is started to pre-cool along with the chilled water, and when the temperature difference between the backwater temperature and the outdoor temperature is less than 5 ℃, the compressor refrigerating system is started to further cool. By the arrangement, energy consumption of the unit can be further reduced, the load of the compressor is reduced, and the running stability of the unit is ensured.
The technical scheme of the invention is as follows: the traditional integral type cold station is distinguished, the scheme adopts two cooling modes of water cooling and natural cooling, and the two cooling modes can independently run or mutually cooperate, so that the energy consumption of a unit can be reduced, the load of a compressor is reduced, the service life of the compressor is prolonged, and the investment cost is reduced while the stable requirement of a user is achieved; according to the scheme, the evaporation cooling device in the natural cooling system sprays the refrigerant, so that the refrigerant is pre-cooled before reaching the specified temperature, the energy consumption of the compressor is reduced, the load of the compressor is lightened, and the refrigerating effect is more stable; according to the scheme, the fan arranged above the natural cooling device is used for forcibly extracting water vapor and heat in the evaporation cooling device, so that the operation stability of the unit is ensured while the cooling is assisted; compared with the traditional water cooling unit using the cooling water tower, the water tank is arranged below the natural cooling device, and meanwhile, the top of the water tank is opened, so that water sprayed by the water evaporation cooling device is received, and the water saving effect is achieved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a dual-effect refrigeration unit 1;
fig. 2 is a schematic diagram of the overall structure of a double-effect refrigerator set 2;
FIG. 3 is a cooling flow chart of chilled water;
fig. 4 is a flow chart of the operation of a dual effect refrigeration unit.
Reference numerals: 1. a refrigerant line; 11. a compressor; 12. a liquid storage tank; 13. an oil separator; 14. an evaporator; 2. a waterway pipeline; 21. a water inlet; 22. a water outlet; 23. a chilled water pump; 24. switching the pipeline; 25. a first valve; 26. a second valve; 3. a steaming cooling device; 31. a natural cooling device; 32. a water tank; 33. a blower.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
1-4, a double-effect integrated refrigerating unit comprises a waterway pipeline 2 and a compressor refrigerating system, wherein the compressor refrigerating system comprises a compressor 11, an oil separator 13, a liquid storage tank 12, an expansion valve and an evaporator 14 which are sequentially arranged on a refrigerant pipeline 1, the compressor 11 and the evaporator 14 are communicated through the refrigerating machine pipeline to form a loop, and the refrigerant circulates in the compressor refrigerating system and is in a low-temperature low-pressure saturated liquid state in the evaporator 14; the unit also comprises a natural cooling system and a control system, wherein the control system is respectively connected with the natural cooling system and the compressor refrigerating system; the natural cooling system comprises a natural cooling device 31 and an evaporation cooling device 3, wherein the natural cooling device 31 is arranged on a waterway pipeline 2, the evaporation cooling device 3 comprises a water tank 32, a water supplementing pump and a spraying device, the water supplementing pump pumps water in the water tank 32 to the spraying device, and the natural cooling device 31 is sprayed through the spraying device; the water channel pipeline 2 is provided with a water inlet 21 and a water outlet 22, the water channel pipeline 2 is provided with a chilled water pump 23, the water channel pipeline 2 passes through the evaporator 14, the chilled water pump 23 pumps chilled water into the water channel pipeline 2 from the water inlet 21, the chilled water pump 23 drives the chilled water to flow in the water channel pipeline 2, the chilled water is output from the water outlet 22, and the chilled water flows through the evaporator 14 after flowing through the natural cooling device 31.
Further preferably, waterway line 2 passes through evaporator 14; so set up for the cooling efficiency of chilled water.
In the embodiment, the natural cooling device 31 is arranged above the water tank 32, the top of the water tank 32 is opened, and water falling from the natural cooler can enter the water tank 32 from the opening; the water tank 32 is convenient to recycle the water cooled by the natural cooling device 31.
Further preferably, the evaporative cooling device 3 further comprises a water recovery device that directs water into the water tank 32. Specific structures of the water recovery device can be seen in patent documents such as CN112544702 a.
The further evaporative cooler 3 further comprises a plurality of sets of fans 33, the fans 33 are arranged above the natural cooling device 31 and the refrigerant pipeline 1, and the fans 33 are started to extract heat of the evaporative cooler 3. Thus, the operation and cooling effect of the evaporative cooling device 3 can be more stable.
In this embodiment, the refrigerant is compressed by the compressor 11, the low-temperature low-pressure gas is changed into high-temperature high-pressure gas, the high-temperature high-pressure gas enters the oil separator 13 for oil-liquid separation, the high-temperature high-pressure gas is cooled by heat exchange in the evaporation cooling device 3 and is changed into normal-temperature high-pressure liquid, the part of normal-temperature high-pressure liquid is filtered and dried by the liquid storage tank 12 and the filter and then enters the expansion valve for gas expansion, the normal-temperature high-pressure gas-liquid mixture is changed into low-temperature low-pressure refrigerant saturated liquid, and the low-temperature low-pressure refrigerant saturated liquid enters the evaporator 14. Finally, the low temperature and low pressure saturated liquid refrigerant exchanges heat in the evaporator 14 with the chilled water passing through the evaporator 14, and the refrigerant evaporates to absorb heat and evaporate, so that the chilled water is cooled to about 15 ℃ which is the temperature required by customers.
In this embodiment, a switching pipeline 24 is connected in the waterway pipeline 2, chilled water can directly pass through the evaporator 14 through the switching pipeline 24, a first valve 25 is disposed on the switching pipeline 24, a second valve 26 is disposed on the waterway pipeline 2, and the second valve 26 is located between the switching pipeline 24 and the natural cooling device 31. Further, the first valve 25 and the second valve 26 are all electrically operated ball valves.
It is further preferred that the refrigerant line 1 between the oil separator 13 and the liquid storage tank 12 is passed through the evaporative cooling device 3 and that the spray device spray-cools the refrigerant line 1 between the oil separator 13 and the liquid storage tank 12.
Further preferably, the compressor 11 is a screw compressor.
The application method of the double-effect integrated refrigerating unit comprises the following steps: and detecting the backwater temperature and the outdoor temperature, and calculating the temperature difference between the backwater temperature and the outdoor temperature.
And if the temperature difference is lower than the value in the preset range, independently starting the natural cooling system. At this time, the first valve 25 is closed, the second valve 26 is opened, the compressor 11 is closed, the evaporation cooling device 3 is opened, the water in the water tank 32 is pumped to the spraying device by the water supplementing pump, the water is sprayed on the natural cooling device 31 by the spraying device, and the natural cooling device 31 is cooled; the chilled water pump 23 is turned on, chilled water enters from the water inlet 21 of the waterway pipeline 2, and the chilled water passes through the chilled water pump 23, the second valve 26, the natural cooling device 31 and the evaporator 14 and then is output from the water outlet 22.
If the temperature difference is larger than the numerical value in the preset range, the natural cooling system and the compressor cooling system are sequentially started. At this time, the first valve 25 is closed, and the second valve 26 is opened; the chilled water pump 23 is started, chilled water enters from the water inlet 21 of the waterway pipeline 2, and the chilled water passes through the chilled water pump 23, the second valve 26, the natural cooling device 31 and the evaporator 14 and then is output from the water outlet 22; the evaporation cooling device 3 is started, the water in the water tank 32 is pumped to the spraying device by the water supplementing pump, the water is sprayed on the natural cooling device 31 by the spraying device, and the chilled water in the natural cooling device 31 and the refrigerator in the refrigerant pipeline 1 are pre-cooled; at this time, the compressor 11 is turned on, the refrigerant is compressed by the compressor 11, the refrigerant is changed from low-temperature low-pressure gas into high-temperature high-pressure gas, the high-temperature high-pressure gas enters the oil separator 13 for oil separation, the high-temperature high-pressure gas is cooled at the evaporation cooling device 3 to become normal-temperature high-pressure liquid, the normal-temperature high-pressure liquid is filtered and dried by the liquid storage tank 12 and the filter and then enters the expansion valve for gas expansion, the mixture of the normal-temperature high-pressure gas and the liquid is changed into the refrigerant saturated liquid with low temperature and low pressure, and the refrigerant saturated liquid with low temperature and low pressure enters the evaporator 14. Finally, the low-temperature low-pressure refrigerant saturated liquid exchanges heat with the chilled water passing through the evaporator 14 in the evaporator 14, the refrigerant evaporates and absorbs heat to evaporate, and the cooled chilled water is continuously cooled to the temperature of about 15 ℃ required by customers in the evaporator 14; chilled water flowing through the evaporator 14 exits the water outlet 22. In this way, the overall energy consumption of the unit is reduced, and the overload of the compressor 11 is avoided, so that the failure rate of the compressor 11 is reduced.
And if the temperature difference is within the preset range, independently starting the compressor refrigerating system. At this time, the natural cooling system is closed, the second valve 26 is closed, and the first valve 25 is opened; the chilled water pump 23 is started, chilled water enters from the water inlet 21 of the waterway pipeline 2, and the chilled water is output from the water outlet 22 after passing through the chilled water pump 23, the switching pipeline 24, the first valve 25 and the evaporator 14; the compressor 11 is started, the compressor 11 compresses the refrigerant to change the low-temperature low-pressure gas into high-temperature high-pressure gas, the high-temperature high-pressure gas enters the oil separator 13 for oil-liquid separation, the high-temperature high-pressure gas is filtered and dried by the liquid storage tank 12 and the filter and then enters the expansion valve for gas expansion, the high-temperature high-pressure gas is changed into low-temperature low-pressure refrigerant saturated liquid, and the low-temperature low-pressure refrigerant saturated liquid enters the evaporator 14. Finally, the low temperature and low pressure saturated liquid refrigerant exchanges heat in the evaporator 14 with the chilled water passing through the evaporator 14, and the refrigerant evaporates to absorb heat and evaporate, so that the chilled water is cooled to about 15 ℃ which is the temperature required by customers.
Further preferably, the preset range of the temperature difference is [ -5 ℃; +5℃ ].
Further preferably, when the temperature difference between the backwater temperature and the outdoor temperature is greater than or equal to 10 ℃, the natural cooling system is started to pre-cool along with the chilled water, and when the temperature difference between the backwater temperature and the outdoor temperature is less than 5 ℃, the compressor refrigerating system is started to further cool.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.
Claims (8)
1. The utility model provides a take natural cooling's double-effect integral type refrigerating unit's application method, be applied to one kind and take natural cooling's double-effect integral type refrigerating unit, take natural cooling's double-effect integral type refrigerating unit includes waterway pipeline (2) and compressor refrigerating system, compressor (11) refrigerating system is including installing compressor (11) on refrigerant pipeline (1) in proper order, oil separator (13), liquid storage tank (12), expansion valve and evaporator (14), compressor (11) and evaporator (14) are through the communicating formation return circuit of refrigerator pipeline, refrigerant circulates in compressor refrigerating system, refrigerant is the saturated liquid form of low temperature low pressure in evaporator (14), its characterized in that: the unit also comprises a natural cooling system and a control system, wherein the control system is respectively connected with the natural cooling system and a refrigerating system of the compressor (11);
the natural cooling system comprises a natural cooling device (31) and an evaporation cooling device (3), wherein the natural cooling device (31) is arranged on a waterway pipeline (2), the evaporation cooling device (3) comprises a water tank (32), a water supplementing pump and a spraying device, the water supplementing pump pumps water in the water tank (32) to the spraying device, and the natural cooling device (31) is sprayed through the spraying device; a water inlet (21) and a water outlet (22) are arranged on the waterway pipeline (2), a chilled water pump (23) is arranged on the waterway pipeline (2), the waterway pipeline (2) penetrates through the evaporator (14), chilled water is pumped into the waterway pipeline (2) from the water inlet (21) by the chilled water pump (23), the chilled water is driven to flow in the waterway pipeline (2) by the chilled water pump (23), flows through the evaporator (14) after flowing through the natural cooling device (31), and is finally output from the water outlet (22);
the water way pipeline (2) is connected with a switching pipeline (24), chilled water passes through the switching pipeline (24) and directly passes through the evaporator (14), a first valve (25) is arranged on the switching pipeline (24), a second valve (26) is arranged on the water way pipeline (2), and the second valve (26) is positioned between the switching pipeline (24) and the natural cooling device (31)
The method comprises the following steps: detecting backwater temperature and outdoor temperature, and calculating the temperature difference between the backwater temperature and the outdoor temperature;
if the temperature difference is smaller than the preset range, independently starting a natural cooling system; the first valve (25) is closed, the second valve (26) is opened, the compressor (11) is closed, the evaporation cooling device (3) is opened, and the chilled water pump (23) is opened; chilled water enters from a water inlet (21) of the waterway pipeline (2), and the chilled water is output from a water outlet (22) after passing through a chilled water pump (23), a second valve (26), a natural cooling device (31) and an evaporator (14);
if the temperature difference is larger than the preset range, sequentially starting a natural cooling system and a compressor cooling system; the first valve (25) is closed, the second valve (26) is opened, the compressor (11) is closed, the evaporation cooling device (3) is opened, the chilled water pump (23) is opened, chilled water enters from the water inlet (21) of the waterway pipeline (2), and the chilled water is output from the water outlet (22) after passing through the chilled water pump (23), the second valve (26), the natural cooling device (31) and the evaporator (14); then the compressor (11) is started to drive the refrigerant in the refrigerant pipeline to flow, and the evaporator (14) exchanges heat secondarily in the waterway pipeline (2);
if the temperature difference is within a preset range, independently starting a compressor (11) refrigerating system; the compressor (11) is started to drive the refrigerant in the refrigerant pipeline to flow, and the refrigerant exchanges heat with the waterway pipeline (2) in the evaporator (14) for the second time.
2. The method of using a double-effect integrated refrigeration unit with natural cooling according to claim 1, wherein: part of the pipelines in the refrigerant pipeline (1) pass through the evaporation cooling device (3), and the evaporation cooling device (3) sprays the refrigerant pipeline (1) through the spraying device.
3. The method of using a double-effect integrated refrigeration unit with natural cooling according to claim 2, wherein: the part of the refrigerant pipeline (1) which is subjected to spray treatment is positioned between the oil separator (13) and the liquid storage tank (12).
4. The method of using a double-effect integrated refrigeration unit with natural cooling according to claim 1, wherein: the first valve (25) and the second valve (26) are all electric ball valves.
5. The method of using a double-effect integrated refrigeration unit with natural cooling according to claim 1, wherein: the water tank (32) is positioned below the natural cooler, and an opening is formed in the top of the water tank (32); the evaporation cooling device (3) further comprises a plurality of groups of fans (33) arranged above the natural cooler, and the fans (33) are started to extract heat in the evaporation cooling device (3).
6. The method of using a double-effect integrated refrigeration unit with natural cooling according to claim 1, wherein: the compressor (11) is a screw compressor (11).
7. The method of using a double-effect integrated refrigeration unit with natural cooling according to claim 1, wherein: the preset range of the temperature difference is minus 5 ℃; +5℃ ].
8. The method of using a double-effect integrated refrigeration unit with natural cooling according to claim 7, wherein: when the temperature difference between the backwater temperature and the outdoor temperature is more than or equal to 10 ℃, the natural cooling system is started to pre-cool chilled water, and when the temperature difference between the backwater temperature and the outdoor temperature is less than 5 ℃, the refrigerating system of the compressor (11) is started to further cool.
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| CN202110601883.1A CN114198951B (en) | 2021-05-31 | 2021-05-31 | Double-effect integrated refrigerating unit with natural cooling function and refrigerating method thereof |
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| CN202110601883.1A CN114198951B (en) | 2021-05-31 | 2021-05-31 | Double-effect integrated refrigerating unit with natural cooling function and refrigerating method thereof |
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| CN114198951B true CN114198951B (en) | 2023-07-28 |
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| CN112460711B (en) * | 2020-12-16 | 2021-12-03 | 珠海格力电器股份有限公司 | Water chilling unit control method and device and water chilling unit |
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