CN109631377A - Evaporation cooling type cold water set heat exchange system and its control method - Google Patents
Evaporation cooling type cold water set heat exchange system and its control method Download PDFInfo
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- CN109631377A CN109631377A CN201811392346.5A CN201811392346A CN109631377A CN 109631377 A CN109631377 A CN 109631377A CN 201811392346 A CN201811392346 A CN 201811392346A CN 109631377 A CN109631377 A CN 109631377A
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- centrifugal compressor
- suspension centrifugal
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 238000001816 cooling Methods 0.000 title claims abstract description 40
- 238000001704 evaporation Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008020 evaporation Effects 0.000 title claims abstract description 32
- 239000000725 suspension Substances 0.000 claims abstract description 64
- 230000008676 import Effects 0.000 claims abstract description 30
- 239000011552 falling film Substances 0.000 claims abstract description 29
- 238000001914 filtration Methods 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 10
- 238000007710 freezing Methods 0.000 claims description 8
- 230000008014 freezing Effects 0.000 claims description 8
- 230000004308 accommodation Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 7
- 238000004781 supercooling Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000004134 energy conservation Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000004378 air conditioning Methods 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 14
- 230000008569 process Effects 0.000 description 9
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- F25B1/053—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of turbine type
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- 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
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2501—Bypass valves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of evaporation cooling type cold water set heat exchange system and its control methods, belong to field of air conditioning, including magnetic suspension centrifugal compressor, evaporative condenser, device for drying and filtering, energy-saving appliance, falling film evaporator and control system；The exhaust outlet of magnetic suspension centrifugal compressor is connected by pipeline with the import of evaporative condenser；The outlet of evaporative condenser is connected by pipeline with the import of device for drying and filtering, is also connected by pipeline with the cooling import of magnetic suspension centrifugal compressor；Falling film evaporator is connected by pipeline with the import of magnetic suspension centrifugal compressor；The exhaust outlet of magnetic suspension centrifugal compressor also passes through pipeline and is connected with falling film evaporator, and bypass solenoid valve is in series on pipeline.By the control of bypass solenoid valve in this programme, realizes that low pressure ratio piston compressor normally starts, protect compressor to avoid damaging, low pressure ratio piston compressor is made to be applied, greatly improve the Energy Efficiency Ratio of unit.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of evaporation cooling type cold water set heat exchange system and its control
Method.
Background technique
Currently, the cooling-water machine technology relevant regulations existing according to country, the design conditions of chilled water entry/exit water temperature are now
12/7 DEG C, refrigerating medium is clear water, and environment is dry/and wet-bulb temperature is 35/24 DEG C, and summer unit runs refrigeration mode, and winter shuts down.And
Some fields, such as rail traffic, edible fungi plantation etc. generally require as year round cooling mode.
It is directly proportional to condensation temperature, environment temperature that transpiration-cooled magnetic suspension water cooler runs power.Refrigerating capacity size
It is directly proportional to evaporating temperature, chilled water temperature.How to go, which runs unit under the conditions of low condensation temperature and high evaporating temperature, is
Improve the key point of unit efficiency.And common water cooler is only the season being warm and is designed, coolant water temperature is by ring
The temperature limiting in border, when winter or transition season, coolant water temperature can be lower, and the unit when coolant water temperature is lower
Efficiency will be higher.
Transpiration-cooled magnetic suspension water cooler is a kind of energy-efficient water cooler, and unit matches magnetic suspension compression
Machine depends on water cooler in starting, stopping or minimum steady load in view of the centrifugal compressed property of magnetic suspension centrifugal compressor
System is applied to the pressure ratio of compressor.When magnetic suspension compressor can not in starting, stopping or underrun stage, system
Meet the pressure ratio for being applied to compressor, the operation of magnetic suspension centrifugal compressor is under abnormal condition, magnetic suspension centrifugal compressed
Machine can not be run under low loading conditions, if client needs to meet refrigeration demand in underload longtime running, it is prolonged and repeated open/
Stop damaging magnetic suspension centrifugal compressor.
Summary of the invention
The embodiment of the invention provides a kind of evaporation cooling type cold water set heat exchange system and its control methods, at least to solve
Certainly one of the technical problems existing in the prior art.In order to which some aspects of the embodiment to disclosure have a basic understanding,
Simple summary is shown below.The summarized section is not extensive overview, nor to determine key/critical component or retouch
Draw the protection scope of these embodiments.Its sole purpose is that some concepts are presented with simple form, in this, as subsequent detailed
Describe bright preamble in detail.
According to a first aspect of the embodiments of the present invention, a kind of evaporation cooling type cold water set heat exchange system is provided；
In some optional embodiments, the evaporation cooling type cold water set heat exchange system includes；Magnetic suspension centrifugal compressed
Machine, evaporative condenser, device for drying and filtering, energy-saving appliance, falling film evaporator and control system；
The exhaust outlet of the magnetic suspension centrifugal compressor is connected by the first pipeline with the import of the evaporative condenser
Logical, the outlet of the evaporative condenser is connected by the second pipeline with the import of the device for drying and filtering, the vaporation-type
The outlet of condenser is also connected by the 6th pipeline with the cooling import of the magnetic suspension centrifugal compressor；
The outlet of the device for drying and filtering is connected by third pipeline with the import of the main hydraulic pipe of the energy-saving appliance, described
The outlet of the main hydraulic pipe of energy-saving appliance is connected by the 4th pipeline with the import of the falling film evaporator, the falling film evaporator
Outlet is connected by the 5th pipeline with the import of the magnetic suspension centrifugal compressor, and the exhaust outlet of the energy-saving appliance passes through the 8th
Pipeline is connected with the import of the magnetic suspension centrifugal compressor, and the magnetic suspension centrifugal compressor passes through cable and the control
System is electrically connected；The exhaust outlet of the magnetic suspension centrifugal compressor also passes through the 9th pipeline and is connected with the falling film evaporator
It is logical, and bypass solenoid valve is in series on the 9th pipeline.
In some optional embodiments, further, the outlet of the device for drying and filtering passes through the 7th pipeline and the section
The supercooling inlet of energy device is connected, and is in series with economizer expansion valve on the 7th pipeline.
In some optional embodiments, further, electric expansion valve is in series on the 4th pipeline.
In some optional embodiments, further, it is provided with liquidometer on the falling film evaporator, it is described for detecting
Liquid level in falling film evaporator.
In some optional embodiments, further, the chilled water outlet of the falling film evaporator and chilled water import point
Pressure difference switch is not provided with it.
In some optional embodiments, further, filter is in series on the 6th pipeline.
According to a second aspect of the embodiments of the present invention, a kind of control method is provided；
In some optional embodiments, the control method is cold for transpiration-cooled described in aforementioned any optional implementation
Water dispenser group heat-exchange system；Including；Step S1, the starting of magnetic suspension centrifugal compressor, evaporation cooling type cold water unit meet trip bar
Part needs compressor interlock switch to be closed if corresponding compressor absolute pressure ratio is greater than 2.0 and continues to be kept for N1 seconds, opens other
For three-way electromagnetic valve to 100%, compressor start closes bypass solenoid valve after the completion；
Step S2, magnetic suspension centrifugal compressor are closed, and evaporation cooling type cold water unit meets halt condition, if corresponding compression
Machine absolute pressure ratio is greater than 2.5 and continues N2 seconds, then the compressor of correspondence system enters minimum ability hold mode, while opening side
After three-way electromagnetic valve continues preset time, compressor is closed, and bypass solenoid valve is closed.
In some optional embodiments, further, in step sl, N1 is 3 seconds；In step s 2, N2 is 30 seconds.
In some optional embodiments, further, in step s 2, straight if corresponding compressor absolute pressure ratio is less than 2.5
Connect shutdown.
In some optional embodiments, further, this method further includes；
Step S3, magnetic suspension centrifugal compressor underrun, evaporation cooling type cold water unit meet operation underload and patrol
Volume, but compressor absolute pressure determines bypass solenoid valve than size according to compressor absolute pressure than not being able to satisfy requirement of system design, system
Aperture, guarantee magnetic suspension centrifugal compressor underload operate normally, meet minimum load service requirement；
Step S4, if the freezing temperature < target temperature-shutdown temperature difference+T, and after continuing 3S, bypass solenoid valve is opened into just
Begin setting aperture, after bypass solenoid valve regulating cycle, if water temperature persistently meets chilled water temperature≤target temperature-shutdown temperature difference
+ T, then bypass solenoid valve is persistently opened into maximum opening by the amplitude of accommodation of setting；Or
If after freezing temperature > target temperature -+T+0.2 DEG C of shutdown temperature difference is for 3 seconds or compressor exits minimum ability state
Continue 30 seconds, bypass solenoid valve starts to close by the amplitude of accommodation；Or
If target temperature -+T DEG C of the shutdown temperature difference≤chilled water temperature≤target temperature-shutdown temperature difference
When within the scope of+T+0.2 DEG C, bypass solenoid valve aperture remains unchanged.
Technical solution provided in an embodiment of the present invention can include the following benefits:
By increasing the connecting pipeline of connection air entry side and exhaust side at exhaust outlet of compressor, increase on connecting pipeline
Add bypass solenoid valve, by the control of bypass solenoid valve, judges that magnetcisuspension floats off by magnetic suspension centrifugal compressor unit absolute pressure ratio
Heart compressor operation conditions is opening/is stopping the stage in magnetic suspension centrifugal compressor respectively, and water chilling unit system is applied to compressor
Pressure ratio can make magnetic suspension centrifugal compressor stabilization open/stop completely, it is ensured that unit normally starts and stops；When magnetic suspension is centrifuged
Compressor underrun, unit needs to run underload logic, but compressor absolute pressure ratio is not able to satisfy requirement of system design, is
System determines the aperture of bypass solenoid valve according to compressor absolute pressure than size, guarantees that magnetic suspension centrifugal compressor underload is normally transported
Row meets unit minimum load service requirement, realizes that low pressure ratio piston compressor normally starts, protects compressor to avoid damaging, make
Low pressure ratio piston compressor is applied, and greatly improves the Energy Efficiency Ratio of unit.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
Fig. 1 is a kind of evaporation cooling type cold water set heat exchange system flow signal shown according to an exemplary embodiment
Figure；
Fig. 2 is a kind of flow diagram of the control method exemplified according to an implementation of another exemplary；
Fig. 3 is a kind of flow diagram of the control method exemplified according to another implementation of another exemplary.
Appended drawing reference:
1- magnetic suspension centrifugal compressor, 2- evaporative condenser, 3- device for drying and filtering, 4- economizer expansion valve, 5- energy conservation
Device, 6- electric expansion valve, 7- falling film evaporator, 8- bypass solenoid valve, 9- pressure difference switch, 10- filter, 11- liquidometer, 12-
Control system；The first pipeline of 13-；The second pipeline of 14-；15- third pipeline；The 4th pipeline of 16-；The 5th pipeline of 17-；18- the 6th
Pipeline；The 7th pipeline of 19-；The 8th pipeline of 20-；The 9th pipeline of 21-.
Specific embodiment
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Practice them.Other embodiments may include structure, logic, it is electrical, process and other change.Embodiment
Only represent possible variation.Unless explicitly requested, otherwise individual components and functionality is optional, and the sequence operated can be with
Variation.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.This hair
The range of bright embodiment includes equivalent obtained by the entire scope of claims and all of claims
Object.Herein, each embodiment individually or can be indicated generally with term " invention ", and it is convenient that this is used for the purpose of,
And if in fact disclosing the invention more than one, the range for being not meant to automatically limit the application is any single invention
Or inventive concept.Herein, relational terms such as first and second and the like be used only for by an entity or operation with
Another entity or operation distinguish, and without requiring or implying, there are any actual relationships between these entities or operation
Or sequence.Moreover, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, thus
So that process, method or equipment including a series of elements not only include those elements, but also including being not explicitly listed
Other element, or further include for this process, method or the intrinsic element of equipment.In the feelings not limited more
Under condition, the element that is limited by sentence "including a ...", it is not excluded that in process, method or equipment including the element
In there is also other identical elements.Each embodiment herein is described in a progressive manner, and each embodiment stresses
Be the difference from other embodiments, the same or similar parts in each embodiment may refer to each other.For implementing
For method, product etc. disclosed in example, since it is corresponding with method part disclosed in embodiment, so the comparison of description is simple
Single, reference may be made to the description of the method.
According to a first aspect of the embodiments of the present invention, a kind of evaporation cooling type cold water set heat exchange system is provided；
As shown in Figure 1, in some optional embodiments, evaporation cooling type cold water set heat exchange system includes；Magnetcisuspension floats off
Heart compressor 1, evaporative condenser 2, device for drying and filtering 3, energy-saving appliance 5, falling film evaporator 7 and control system 12；
The import that the exhaust outlet of the magnetic suspension centrifugal compressor 1 passes through the first pipeline 13 and the evaporative condenser 2
It is connected, and be connected with the falling film evaporator 7 by the 9th pipeline 21, the outlet of the evaporative condenser 2 passes through the
Two pipelines 14 are connected with the import of the device for drying and filtering 3, the outlet of the evaporative condenser 2 also pass through the 6th pipeline with
The cooling import of the compressor is connected；
The outlet of the device for drying and filtering 3 is connected by third pipeline 15 with the import of the main hydraulic pipe of the energy-saving appliance 5,
The outlet of the main hydraulic pipe of the energy-saving appliance 5 is connected by the 4th pipeline 16 with the import of the falling film evaporator 7, the falling liquid film
The outlet of evaporator 7 is connected by the 5th pipeline 17 with the import of the compressor, and the exhaust outlet of the energy-saving appliance 5 passes through the
Eight pipelines 20 are connected with the import of the compressor, and the compressor is electrically connected by cable with the control system 12,
The exhaust outlet of the magnetic suspension centrifugal compressor 1 also passes through the 9th pipeline 21 and is connected with the falling film evaporator 7, and described
Bypass solenoid valve 8 is in series on nine pipelines 21.
In this embodiment, operating process, the exhaust of the refrigerant of evaporation cooling type cold water unit from magnetic suspension compressor 1
Mouth discharge enters through the first pipeline 13 from 2 import of evaporative condenser, and the gaseous coolant of high temperature and pressure is in evaporative condenser 2
In be condensed into high temperature and pressure liquid refrigerant, high temperature and pressure liquid refrigerant flows through device for drying and filtering 3 by the second pipeline 14, through dry
5 main hydraulic pipe import of energy-saving appliance is entered by third pipeline 15 after dry filter 3 is dry, is too cold during flowing through energy-saving appliance 5
The refrigerant of inlet is cooled down, and degree of supercooling increases, and is flowed through 3 part refrigerant of device for drying and filtering by the 7th pipeline 19 and is entered energy-saving appliance
5 supercooling inlets, are throttled by economizer expansion valve 4 in the process, and low-pressure liquid refrigerant is formed in 5 evaporation endothermic of energy-saving appliance
It is cooling that inlet refrigerant is subcooled to energy-saving appliance 5.After subcooled liquid refrigerant after energy-saving appliance 5 is throttled by electric expansion valve 6, lead to
It crosses the 4th pipeline 16 and enters falling film evaporator 7, refrigerant steams after falling film evaporator 7 and refrigerating medium sufficiently exchange heat from falling liquid film after throttling
The outlet discharge for sending out device 7 converges finally by the 5th pipeline 17 to the air entry of compressor, and the cooling refrigerant of motor is taken at vaporation-type
The second pipeline of outlet 14 of condenser 2 is compressed by entering magnetic suspension after the drying of filter 10 on cooling 6th pipeline of motor
Machine 1, it is cooling to motor；When compressor is in low load operation, needed according to system in first pipe of the outlet of magnetic suspension compressor 1
Road 13 takes part high pressure gaseous refrigerant to be discharged into falling film evaporator 7 by the unlatching of bypass solenoid valve 8 of the 9th pass road
Face is conducive to compressor low load operation.
In some optional embodiments, further, the outlet of the device for drying and filtering 3 by the 7th pipeline 19 with it is described
The supercooling inlet of energy-saving appliance 5 is connected, and economizer expansion valve is in series on the 7th pipeline 19, the convenient refrigerant to process
Filtering is dried.
In some optional embodiments, further, as shown in Figure 1, being in series with filter 10 on the 6th pipeline.Side
Just filtering is dried to the refrigerant of process.
In some optional embodiments, further, as shown in Figure 1, being in series with electronic expansion on the 4th pipeline 16
Valve 6.Refrigerant for passing through to it carries out throttling processing.
In some optional embodiments, further, as shown in Figure 1, being provided with liquidometer on the falling film evaporator 7
11, for detecting the liquid level in the falling film evaporator 7, convenient for the real time monitoring to liquid level in falling film evaporator 7.
In some optional embodiments, further, as shown in Figure 1, the chilled water outlet of the falling film evaporator 7 and cold
Freeze water inlet and be respectively arranged with pressure difference switch 9, improves the security performance of export and import.
According to a second aspect of the embodiments of the present invention, a kind of control method is provided；
As shown in Figures 2 and 3, in some optional embodiments, the control method is directed to aforementioned any optional implementation institute
The evaporation cooling type cold water set heat exchange system stated；Including；Step S1, the starting of magnetic suspension centrifugal compressor, transpiration-cooled are cold
Water dispenser group meets entry condition, if corresponding compressor absolute pressure ratio is greater than 2.0 and continues to be kept for N1 seconds, needs compressor chain
It closes the switch, opens bypass solenoid valve to 100%, compressor start closes bypass solenoid valve after the completion；
Step S2, magnetic suspension centrifugal compressor are closed, and evaporation cooling type cold water unit meets halt condition, if corresponding compression
Machine absolute pressure ratio is greater than 2.5 and continues N2 seconds, then the compressor of correspondence system enters minimum ability hold mode, while opening side
After three-way electromagnetic valve continues preset time, compressor is closed, and bypass solenoid valve is closed.
Optionally, in step sl, N1 is 3 seconds；In step s 2, N2 is 30 seconds.
Optionally, step, in step s 2, the directly shutdown if corresponding compressor absolute pressure ratio is less than 2.5.
In this embodiment, by the control of bypass solenoid valve, by magnetic suspension centrifugal compressor unit absolute pressure than judging
Magnetic suspension centrifugal compressor operation conditions is opening/is stopping the stage in magnetic suspension centrifugal compressor respectively, and water chilling unit system is applied to
The pressure ratio of compressor can make magnetic suspension centrifugal compressor stabilization open/stop completely, it is ensured that unit normally starts and stops；Work as magnetic
Suspended centrifugal compressor underrun, unit needs to run underload logic, but compressor absolute pressure is set than not being able to satisfy system
Meter requires, and system determines the aperture of bypass solenoid valve according to compressor absolute pressure than size, guarantees that magnetic suspension centrifugal compressor is low negative
Lotus operates normally, and meets unit minimum load service requirement, realizes that low pressure ratio piston compressor normally starts, compressor is protected to avoid
Damage, makes low pressure ratio piston compressor be applied, greatly improves the Energy Efficiency Ratio of unit.
As shown in figure 3, in some optional embodiments, further, this method further includes；
Step S3, magnetic suspension centrifugal compressor underrun, evaporation cooling type cold water unit meet operation underload and patrol
Volume, but compressor absolute pressure determines bypass solenoid valve than size according to compressor absolute pressure than not being able to satisfy requirement of system design, system
Aperture, guarantee magnetic suspension centrifugal compressor underload operate normally, meet minimum load service requirement；
Step S4, if the freezing temperature < target temperature-shutdown temperature difference+T, and after continuing 3S, bypass solenoid valve is opened into just
Begin setting aperture, after bypass solenoid valve regulating cycle, if water temperature persistently meets chilled water temperature≤target temperature-shutdown temperature difference
+ T, then bypass solenoid valve is persistently opened into maximum opening by the amplitude of accommodation of setting；Or
If after freezing temperature > target temperature -+T+0.2 DEG C of shutdown temperature difference is for 3 seconds or compressor exits minimum ability state
Continue 30 seconds, bypass solenoid valve starts to close by the amplitude of accommodation；Or
If within the scope of target temperature -+T DEG C of the shutdown temperature difference≤chilled water temperature≤target temperature -+T+0.2 DEG C of shutdown temperature difference
When, bypass solenoid valve aperture remains unchanged.
In a specific embodiment of the present embodiment, as shown in figure 3, the operating procedure of this method is as follows,
Step S1, the starting of magnetic suspension centrifugal compressor, evaporation cooling type cold water unit meet entry condition, if corresponding compression
Machine absolute pressure ratio is greater than 2.0 and continues to be kept for 3 seconds, then needs compressor interlock switch to be closed, open bypass solenoid valve extremely
100%, compressor start closes bypass solenoid valve after the completion；
Step S2, magnetic suspension centrifugal compressor are closed, and evaporation cooling type cold water unit meets halt condition, if corresponding compression
Machine absolute pressure ratio is greater than 2.5 and continues 30 seconds, then the compressor of correspondence system enters minimum ability hold mode, while opening side
After three-way electromagnetic valve continues preset time, compressor is closed, and bypass solenoid valve is closed；
Step S3, magnetic suspension centrifugal compressor underrun, evaporation cooling type cold water unit meet operation underload and patrol
Volume, but compressor absolute pressure determines bypass solenoid valve than size according to compressor absolute pressure than not being able to satisfy requirement of system design, system
Aperture, guarantee magnetic suspension centrifugal compressor underload operate normally, meet minimum load service requirement；
Step S4, if the freezing temperature < target temperature-shutdown temperature difference+T, and after continuing 3S, bypass solenoid valve is opened into just
Begin setting aperture, after bypass solenoid valve regulating cycle, if water temperature persistently meets chilled water temperature≤target temperature-shutdown temperature difference
+ T, then bypass solenoid valve is persistently opened into maximum opening by the amplitude of accommodation of setting；If or freezing temperature > target temperature-shutdown
After+T+0.2 DEG C of the temperature difference for 3 seconds or compressor exits minimum ability state and continues 30 seconds, and bypass solenoid valve starts by adjusting width
Degree is closed；If or within the scope of target temperature -+T DEG C of shutdown temperature difference≤chilled water temperature≤target temperature -+T+0.2 DEG C of shutdown temperature difference
When, bypass solenoid valve aperture remains unchanged.
Magnetic suspension centrifugal compressor operation conditions is judged by magnetic suspension centrifugal compressor unit absolute pressure ratio, respectively in magnetcisuspension
Floating centrifugal compressor is opening/is stopping the stage, and the pressure ratio that water chilling unit system is applied to compressor can make magnetic suspension be centrifuged completely
Compressor stabilization opens/stops, it is ensured that unit normally starts and stops；When magnetic suspension centrifugal compressor underrun, unit needs
Underload logic is run, but compressor absolute pressure ratio is not able to satisfy requirement of system design, system is determined according to compressor absolute pressure than size
Determine the aperture of bypass solenoid valve, guarantees that magnetic suspension centrifugal compressor underload operates normally, by reducing compressor start process
In, the suction and exhaust ports pressure ratio of compressor realizes lower system compresses ratio, compressor is protected to avoid compressor due to height
Pressure ratio and generate failure or damage, enable to evaporate cold group using low pressure ratio piston compressor.
The evaporation cooling type cold water set heat exchange system that there is the air conditioner room unit that second aspect provides first aspect to provide
System, therefore whole beneficial effects of the evaporation cooling type cold water set heat exchange system provided with first aspect, it is just different herein
One repeats.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other implementations
Certain features rather than other feature included by example, but the combination of the feature of different embodiments means in the present invention
Within the scope of and form different embodiments.For example, in claims above, embodiment claimed
It is one of any can in any combination mode come using.The information disclosed in the background technology section is intended only to deepen pair
The understanding of general background technology of the invention, and be not construed as recognizing or implying in any form that information composition has been this
The prior art well known to the technical staff of field.
Claims (10)
1. a kind of evaporation cooling type cold water set heat exchange system, which is characterized in that including；Magnetic suspension centrifugal compressor, vaporation-type
Condenser, device for drying and filtering, energy-saving appliance, falling film evaporator and control system；
The exhaust outlet of the magnetic suspension centrifugal compressor is connected by the first pipeline with the import of the evaporative condenser, institute
The outlet for stating evaporative condenser is connected by the second pipeline with the import of the device for drying and filtering, the evaporative condenser
Outlet be also connected by the 6th pipeline with the cooling import of the magnetic suspension centrifugal compressor；
The outlet of the device for drying and filtering is connected by third pipeline with the import of the main hydraulic pipe of the energy-saving appliance, the energy conservation
The outlet of the main hydraulic pipe of device is connected by the 4th pipeline with the import of the falling film evaporator, the outlet of the falling film evaporator
It is connected by the 5th pipeline with the import of the magnetic suspension centrifugal compressor, the exhaust outlet of the energy-saving appliance passes through the 8th pipeline
It is connected with the import of the magnetic suspension centrifugal compressor, the magnetic suspension centrifugal compressor passes through cable and the control system
It is electrically connected；The exhaust outlet of the magnetic suspension centrifugal compressor also passes through the 9th pipeline and is connected with the falling film evaporator, and
Bypass solenoid valve is in series on 9th pipeline.
2. evaporation cooling type cold water set heat exchange system according to claim 1, which is characterized in that
The outlet of the device for drying and filtering is connected by the 7th pipeline with the supercooling inlet of the energy-saving appliance, and the described 7th
Economizer expansion valve is in series on pipeline.
3. evaporation cooling type cold water set heat exchange system according to claim 1, which is characterized in that
Electric expansion valve is in series on 4th pipeline.
4. evaporation cooling type cold water set heat exchange system according to claim 1, which is characterized in that
It is provided with liquidometer on the falling film evaporator, for detecting the liquid level in the falling film evaporator.
5. evaporation cooling type cold water set heat exchange system according to claim 4, which is characterized in that
The chilled water outlet and chilled water import of the falling film evaporator are respectively arranged with pressure difference switch.
6. evaporation cooling type cold water set heat exchange system according to claim 1, which is characterized in that
Filter is in series on 6th pipeline.
7. a kind of control method, which is characterized in that apply the transpiration-cooled described in any one of the claims 1 to 6
Water cooler heat-exchange system, including；
Step S1, the starting of magnetic suspension centrifugal compressor, evaporation cooling type cold water unit meet entry condition, if corresponding compressor is exhausted
Pressure ratio is greater than 2.0 and continues to be kept for N1 seconds, then compressor interlock switch is needed to be closed, and opens bypass solenoid valve to 100%, presses
Bypass solenoid valve is closed after contracting machine start completion；
Step S2, magnetic suspension centrifugal compressor are closed, and evaporation cooling type cold water unit meets halt condition, if corresponding compressor is exhausted
Pressure ratio is greater than 2.5 and continues N2 seconds, then the compressor of correspondence system enters minimum ability hold mode, while opening bypass electricity
After magnet valve continues preset time, compressor is closed, and bypass solenoid valve is closed.
8. control method according to claim 7, which is characterized in that
In step sl, N1 is 3 seconds；In step s 2, N2 is 30 seconds.
9. control method according to claim 7, which is characterized in that
In step s 2, it is directly shut down if corresponding compressor absolute pressure ratio is less than 2.5.
10. control method according to claim 7, which is characterized in that further include；
Step S3, magnetic suspension centrifugal compressor underrun, evaporation cooling type cold water unit meet operation underload logic, but
Compressor absolute pressure determines opening for bypass solenoid valve than size according to compressor absolute pressure than not being able to satisfy requirement of system design, system
Degree guarantees that magnetic suspension centrifugal compressor underload operates normally, meets minimum load service requirement；
Step S4, if the freezing temperature < target temperature-shutdown temperature difference+T, and after continuing 3S, bypass solenoid valve, which is opened into, initially to be set
Determine aperture, after bypass solenoid valve regulating cycle, if water temperature persistently meets the chilled water temperature≤target temperature-shutdown temperature difference+T,
Then bypass solenoid valve is persistently opened into maximum opening by the amplitude of accommodation of setting；Or
If after freezing temperature > target temperature -+T+0.2 DEG C of shutdown temperature difference is for 3 seconds or compressor exits minimum ability state and continues
30 seconds, bypass solenoid valve started to close by the amplitude of accommodation；Or
If other when within the scope of target temperature -+T DEG C of the shutdown temperature difference≤chilled water temperature≤target temperature -+T+0.2 DEG C of shutdown temperature difference
Three-way electromagnetic valve aperture remains unchanged.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811392346.5A CN109631377B (en) | 2018-11-21 | 2018-11-21 | Evaporative cooling chiller heat exchange system and control method thereof |
| PCT/CN2019/103290 WO2020103516A1 (en) | 2018-11-21 | 2019-08-29 | Evaporative cooling chiller unit heat-exchanging system and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811392346.5A CN109631377B (en) | 2018-11-21 | 2018-11-21 | Evaporative cooling chiller heat exchange system and control method thereof |
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| CN109631377A true CN109631377A (en) | 2019-04-16 |
| CN109631377B CN109631377B (en) | 2021-05-28 |
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| WO (1) | WO2020103516A1 (en) |
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|---|---|
| WO2020103516A1 (en) | 2020-05-28 |
| CN109631377B (en) | 2021-05-28 |
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