CN110966781A - Water chilling unit and control method - Google Patents
Water chilling unit and control method Download PDFInfo
- Publication number
- CN110966781A CN110966781A CN201811141687.5A CN201811141687A CN110966781A CN 110966781 A CN110966781 A CN 110966781A CN 201811141687 A CN201811141687 A CN 201811141687A CN 110966781 A CN110966781 A CN 110966781A
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- falling film
- expansion valve
- electronic expansion
- flow
- flow meter
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000011552 falling film Substances 0.000 claims abstract description 99
- 239000003507 refrigerant Substances 0.000 claims abstract description 76
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 238000005057 refrigeration Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 3
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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Classifications
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
-
- 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
- F25B2600/2513—Expansion valves
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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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a water chilling unit and a control method, wherein the water chilling unit comprises a compressor, a condenser and a plurality of falling film evaporators; the falling film evaporators are connected in parallel, a liquid pipe of each falling film evaporator is connected with a liquid pipe of the condenser, and an air pipe of each falling film evaporator is connected with an air suction pipe of the compressor; a liquid pipe of each falling film evaporator is connected in series with a flow meter and an electronic expansion valve; and each flowmeter respectively collects the refrigerant flow signals in the corresponding liquid pipe and sends the refrigerant flow signals to a control panel of the water chilling unit, and the control panel controls the opening of each electronic expansion valve according to the received flow signals. According to the invention, a plurality of parallel falling film evaporators are designed, the liquid pipe of each evaporator is provided with the refrigerant flow meter and the electronic expansion valve, and the control panel controls the opening degree of each electronic expansion valve according to the flow signal sent by each flow meter, so that the refrigerant flow in the parallel falling film evaporators is the same, and the refrigerant is uniformly distributed.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a water chilling unit and a control method.
Background
Falling film evaporators have been applied to water chilling units with medium and small refrigeration capacity in the market at present, and water chilling units with large refrigeration capacity (for example, more than 1000 RT) are difficult to replace traditional flooded evaporators by falling film evaporators, and the main reasons are that: the refrigerant distribution area of the falling film evaporator with large cooling capacity is large, the distribution device of the evaporator with gas-liquid two-phase flow is difficult to uniformly distribute the liquid refrigerant on the surface of a large-area heat exchange tube, so that the heat exchange performance is poor, and the performance of the unit is lower than that of a flooded water chilling unit.
Disclosure of Invention
The invention provides a water chilling unit, which solves the problem of uneven refrigerant distribution in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a water chilling unit comprises a compressor, a condenser and a plurality of falling film evaporators; the falling film evaporators are connected in parallel, a liquid pipe of each falling film evaporator is connected with a liquid pipe of the condenser, and an air pipe of each falling film evaporator is connected with an air suction pipe of the compressor; a liquid pipe of each falling film evaporator is connected in series with a flow meter and an electronic expansion valve; and each flowmeter respectively collects the refrigerant flow signals in the corresponding liquid pipe and sends the refrigerant flow signals to a control panel of the water chilling unit, and the control panel controls the opening of each electronic expansion valve according to the received flow signals.
Furthermore, an electronic expansion valve is arranged between the flow meter and the falling film evaporator on a liquid pipe of each falling film evaporator.
Still further, the arrangement heights of the plurality of falling film evaporators are equal.
Furthermore, the falling film evaporators are identical in structure and size.
Still further, the falling film evaporator is provided with two falling film evaporators.
Furthermore, the water chilling unit further comprises a gas collecting cylinder, wherein a gas inlet of the gas collecting cylinder is connected with a gas pipe of each falling film evaporator respectively, and a gas outlet of the gas collecting cylinder is connected with a gas suction pipe of the compressor.
Still further, a plurality of compressors are distributed and connected in parallel.
Furthermore, the condenser is provided with a plurality of condensers which are connected in parallel.
Based on the design of the water chilling unit, the invention also provides a water chilling unit control method, which comprises the following steps:
(1) each flow meter respectively collects a refrigerant flow signal in a liquid pipe of the corresponding falling film evaporator and sends the refrigerant flow signal to a control panel of the water chilling unit;
(2) selecting one of the flow meters as a reference flow meter, taking a flow signal measured by the reference flow meter as a reference flow signal, taking an electronic expansion valve connected with the reference flow meter in series as a reference electronic expansion valve, and judging whether the received flow signals measured by the other flow meters are equal to the reference flow signal by a control board;
if not, the control board adjusts the opening degree of each electronic expansion valve except the reference electronic expansion valve and returns to the step (1);
and if so, keeping the current opening degree of each electronic expansion valve.
Further, the adjusting, by the control board, the opening degree of each electronic expansion valve other than the reference electronic expansion valve specifically includes:
and adjusting the opening degree of the electronic expansion valve connected in series with each flow meter except the reference flow meter according to the difference value of the flow signal of each flow meter except the reference flow meter and the reference flow signal.
Compared with the prior art, the invention has the advantages and positive effects that: according to the water chilling unit and the control method, the plurality of parallel falling film evaporators are designed, the liquid pipe of each evaporator is provided with the refrigerant flowmeter and the electronic expansion valve, the control board controls the opening degree of each electronic expansion valve according to the flow signal sent by each flowmeter, so that the refrigerant flow in the parallel falling film evaporators is the same, the refrigerant distribution is uniform, the unit performance is improved, and the problem of uneven refrigerant distribution in the prior art is solved.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a water chiller according to the present invention;
fig. 2 is a flowchart of an embodiment of a control method for a chiller according to the present invention.
Reference numerals:
1. a compressor; 2. a condenser; 3. a first flow meter; 4. a first electronic expansion valve;
5. a second flow meter; 6. a second electronic expansion valve; 7. a first evaporator; 8. a second evaporator;
9. a gas collecting cylinder.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The water chilling unit of the present embodiment mainly includes a compressor 1, a condenser 2, a plurality of falling film evaporators, and the like, as shown in fig. 1; the falling film evaporators are connected in parallel, a liquid pipe of each falling film evaporator is connected with a liquid pipe of the condenser, and an air pipe of each falling film evaporator is connected with an air suction pipe of the compressor; a liquid pipe of each falling film evaporator is connected in series with a flowmeter and an electronic expansion valve, and each flowmeter respectively collects a refrigerant flow signal in the liquid pipe of the corresponding falling film evaporator and sends the refrigerant flow signal to a water chilling unit control panel; the control board controls the opening degree of each electronic expansion valve according to the received flow signal.
The control panel is according to the aperture of each electronic expansion valve of flow signal control that received every flowmeter sent for the refrigerant flow in the liquid pipe of a plurality of falling film evaporator equals, promptly, makes the refrigerant flow that gets into every falling film evaporator the same, thereby makes the refrigerant of cooling water set can distribute evenly in a plurality of falling film evaporators, thereby when guaranteeing the big cold volume of unit, improves the refrigeration performance of unit, guarantees the high efficiency of unit.
The water chilling unit of this embodiment is through designing a plurality of falling film evaporators that connect in parallel to set up refrigerant flowmeter and electronic expansion valve on the liquid pipe of every evaporator, the control panel controls the aperture of every electronic expansion valve according to the flow signal that every flowmeter sent, make the refrigerant flow the same in each falling film evaporator that connects in parallel, make the refrigerant distribution even, improved the unit performance, solved the uneven problem of refrigerant distribution in the evaporator among the prior art, thereby when guaranteeing the big cold volume of unit, guaranteed the high efficiency of unit again.
On the liquid pipe of each falling film evaporator, an electronic expansion valve is arranged between a flowmeter and the falling film evaporator, namely, the flowmeter is arranged in front of the falling film evaporator, the electronic expansion valve is arranged behind the flowmeter, and a refrigerant passes through the flowmeter, then flows through the electronic expansion valve and then enters the falling film evaporator. The liquid refrigerant is changed into a gas-liquid two-phase refrigerant after being throttled by the electronic expansion valve, and if a flow meter is used for collecting a refrigerant flow signal at the moment, the collected flow signal has a larger error; therefore, the flow meter is arranged in front of the electronic expansion valve, liquid refrigerant firstly flows through the flow meter, the flow meter collects refrigerant flow signals, and then the refrigerant enters the falling film evaporator through the electronic expansion valve, so that the flow meter can conveniently collect the liquid pipe refrigerant flow on the real and effective falling film evaporator, and the flow of the refrigerant entering a liquid pipe of each falling film evaporator is the same by controlling the opening degree of the electronic expansion valve.
In this embodiment, the plurality of falling film evaporators are arranged at the same height, so as to avoid different refrigerant flows entering each falling film evaporator due to different heights, thereby improving the uniformity of refrigerant distribution.
In this embodiment, the plurality of falling film evaporators have the same structure and the same size, so that the difference in the flow rate of the refrigerant entering each falling film evaporator due to the difference in the structure and the size is avoided, and the uniformity of refrigerant distribution is improved.
In this embodiment, two falling film evaporators are provided, and the two falling film evaporators are connected in parallel. By arranging the two falling film evaporators, the requirement of large cooling capacity of the unit can be met, and the problem that the structure of the water chilling unit is complex due to the fact that the falling film evaporators are excessively designed is avoided.
In this embodiment, the water chilling unit further includes a gas collecting cylinder 9, a gas inlet of the gas collecting cylinder 9 is connected to a gas pipe of each falling film evaporator, and a gas outlet of the gas collecting cylinder 9 is connected to a gas suction pipe of the compressor. After entering the gas collecting cylinder 9, the gas flowing out of each falling film evaporator flows to the compressor 1, so that the gas outlet flow of each falling film evaporator is balanced.
In this embodiment, the compressor is a centrifugal compressor or a screw compressor, the compressor is provided with a plurality of compressors connected in parallel, and the air outlet of the air collecting cylinder 9 is connected to the air suction pipe of each compressor respectively. The gas collecting cylinder 9 collects the refrigerant gas of each falling film evaporator and distributes the refrigerant gas to each compressor, so that the sucked gas flow of each compressor is balanced, and the performance of each compressor and the whole water chilling unit is improved.
In this embodiment, the condenser is an air-cooled condenser or a water-cooled condenser, and the plurality of condensers are arranged in parallel to improve the condensing capacity and output a liquid refrigerant with a lower temperature.
In this embodiment, the plurality of flow meters are the same in type, the plurality of electronic expansion valves are the same in type, and the plurality of evaporators are the same in type.
The water chilling unit comprises a compressor, a condenser and two falling film evaporators connected in parallel: the first evaporator 7 and the second evaporator 8 are examples, and the operation principle of the water chiller will be described in detail.
A first flowmeter 3 and a first electronic expansion valve 4 are connected in series to a liquid pipe of a first evaporator 7, and a second flowmeter 5 and a second electronic expansion valve 6 are connected in series to a liquid pipe of a second evaporator 8.
High-temperature gaseous refrigerant discharged from the compressor 1 enters a condenser 2, is condensed into liquid refrigerant with a certain supercooling degree after heat exchange, is discharged from a liquid pipe of the condenser 2, is divided into two paths, enters a first electronic expansion valve 4 after passing through a first flowmeter 3 for throttling in one path to form gas-liquid two-phase refrigerant, then enters a first falling film evaporator 7, the liquid refrigerant is evaporated in the first falling film evaporator 7 to form refrigerant vapor, and the vapor flows out of the first falling film evaporator 7 and then enters a gas collecting cylinder 9; the other path enters a second electronic expansion valve 6 through a second flowmeter 5 for throttling to form a gas-liquid two-phase refrigerant, then enters a second falling film evaporator 8, the liquid refrigerant is evaporated in the second falling film evaporator 8 to form refrigerant steam, and the steam flows out of the second falling film evaporator 8 and then enters a gas collecting cylinder 9; the two paths of refrigerant vapor are collected in the gas collecting cylinder 9 and then enter the compressor 1, and are discharged from the compressor 1 after being compressed, so that a complete refrigeration cycle is completed.
On one hand, because the flow meters are arranged in front of the two paths of electronic expansion valves (the first flow meter 3 is arranged in front of the first electronic expansion valve 4, and the second flow meter 5 is arranged in front of the second electronic expansion valve 6), when the flow rates of the two paths of liquid refrigerants are different, the flow rates of the two paths of liquid refrigerants can be always kept the same by adjusting the opening degrees of the first electronic expansion valve 3 and the second electronic expansion valve 4, and therefore the uniformity of the refrigerant flow distribution of the two falling film evaporators (the first falling film evaporator 7 and the second falling film evaporator 8) is ensured.
On the other hand, the water chilling unit comprises two relatively small falling film evaporators (the first falling film evaporator 7 and the second falling film evaporator 8) with refrigeration capacities of 50% respectively, and each 50% refrigeration capacity falling film evaporator is much smaller than the falling film evaporator with refrigeration capacity of 100%, so that the refrigerant distribution area is relatively small, the liquid refrigerant can be uniformly distributed on the surface of a large-area heat exchange tube in the evaporator easily, and the uniformity of refrigerant flow distribution is improved.
On the other hand, the first falling film evaporator 7 and the second falling film evaporator 8 are symmetrically connected with the gas collecting cylinder 9, so that the vapor flow rate of the two falling film evaporators is the same, and the uniformity of the flow rate distribution of the two paths of refrigerants is also ensured.
Due to the reasons in the aspects, the uniformity of distribution and the uniformity of flow of the refrigerant in the large-cooling-capacity falling film evaporator are ensured, so that the refrigerating capacity and the energy efficiency of the large-cooling-capacity water chilling unit are obviously improved while the large cooling capacity of the unit is realized.
In the embodiment, the uniformity of refrigerant distribution in the falling film evaporators and the uniformity of refrigerant flow of parallel flow paths are ensured by connecting a plurality of same falling film evaporators in parallel, arranging a flow meter in front of an electronic expansion valve and arranging an air collecting cylinder behind the falling film evaporators, so that the performance of the large-cooling-capacity water chilling unit is improved remarkably.
Based on the design of the water chilling unit, the present embodiment further provides a water chilling unit control method, which mainly includes the following steps, as shown in fig. 2.
Step S1: and each flow meter respectively collects the refrigerant flow signals in the liquid pipe of the corresponding falling film evaporator and sends the refrigerant flow signals to the water chilling unit control panel.
Step S2: one of the flow meters is selected as a reference flow meter, the flow signal measured by the reference flow meter is used as a reference flow signal, the electronic expansion valve connected with the reference flow meter in series is used as a reference electronic expansion valve, and the control board judges whether the received flow signals measured by the other flow meters are equal to the reference flow signal.
If not, the refrigerant flow in the liquid tubes of the falling film evaporators is not uniform, then step S3 is executed: the control board adjusts the opening degree of each electronic expansion valve other than the reference electronic expansion valve, and returns to step S1.
If so, it indicates that the refrigerant flow in the liquid tubes of all the falling film evaporators is uniform, then step S4 is executed: each electronic expansion valve maintains the current opening degree.
In the control method of the water chilling unit, refrigerant flow signals in liquid pipes of corresponding falling film evaporators are respectively collected through each flowmeter and are sent to the control panel of the water chilling unit; selecting one of the flow meters as a reference flow meter, taking a flow signal measured by the reference flow meter as a reference flow signal, taking an electronic expansion valve connected with the reference flow meter in series as a reference electronic expansion valve, and judging whether the received flow signals measured by the other flow meters are equal to the reference flow signal by a control board; if so, keeping the current opening degree of each electronic expansion valve; if not, the control board adjusts the opening degree of each electronic expansion valve except the reference electronic expansion valve, and the refrigerant flow signals in the liquid pipe of the falling film evaporator are collected again until the flow signals measured by other flowmeters are equal to the reference flow signals; the refrigerant flow in the liquid pipes of the falling film evaporators is equal, namely, the refrigerant flow entering each falling film evaporator is the same, so that the refrigerant of the water chilling unit can be uniformly distributed in the falling film evaporators, the refrigerating performance of the unit is improved while the large refrigerating capacity of the unit is guaranteed, and the high efficiency of the unit is guaranteed.
In this embodiment, the step S3 of controlling the control board to adjust the opening degree of each electronic expansion valve except the reference electronic expansion valve specifically includes:
step S31: and adjusting the opening degree of the electronic expansion valve connected in series with each flow meter except the reference flow meter according to the difference value of the flow signal of each flow meter except the reference flow meter and the reference flow signal.
For example, if the difference between the flow signal of one of the flow meters and the reference flow signal is positive and the absolute value of the difference is greater than a set value, the opening degree of the electronic expansion valve connected in series with the flow meter is reduced to reduce the flow rate of the refrigerant in the liquid tube of the corresponding evaporator; if the difference is negative and the absolute value of the difference is larger than the set value, the opening degree of the electronic expansion valve connected with the flowmeter in series is increased so as to increase the flow rate of the refrigerant in the liquid pipe of the corresponding evaporator.
The opening degree of the electronic expansion valve is adjusted through the design step S31, the method is simple and convenient to control, and the refrigerant can be uniformly distributed in the plurality of falling film evaporators.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A water chilling unit is characterized in that: comprises a compressor, a condenser and a plurality of falling film evaporators; the falling film evaporators are connected in parallel, a liquid pipe of each falling film evaporator is connected with a liquid pipe of the condenser, and an air pipe of each falling film evaporator is connected with an air suction pipe of the compressor;
a liquid pipe of each falling film evaporator is connected in series with a flow meter and an electronic expansion valve; and each flowmeter respectively collects the refrigerant flow signals in the corresponding liquid pipe and sends the refrigerant flow signals to a control panel of the water chilling unit, and the control panel controls the opening of each electronic expansion valve according to the received flow signals.
2. The chiller according to claim 1, wherein: and an electronic expansion valve is arranged between the flow meter and the falling film evaporator on a liquid pipe of each falling film evaporator.
3. The chiller according to claim 1, wherein: the arrangement heights of the falling film evaporators are equal.
4. The chiller according to claim 1, wherein: the falling film evaporators have the same structure and the same size.
5. The chiller according to claim 1, wherein: the falling film evaporator is provided with two falling film evaporators.
6. The chiller according to claim 1, wherein: the water chilling unit further comprises a gas collecting cylinder, wherein a gas inlet of the gas collecting cylinder is connected with a gas pipe of each falling film evaporator respectively, and a gas outlet of the gas collecting cylinder is connected with a gas suction pipe of the compressor.
7. The chiller according to claim 6, wherein: the compressor is laid a plurality ofly, and a plurality of compressors are parallelly connected.
8. The chiller according to claim 1, wherein: the condenser is laid a plurality ofly, and a plurality of condensers are parallelly connected.
9. A control method for a water chilling unit according to any one of claims 1 to 8, characterized in that: the control method comprises the following steps:
(1) each flow meter respectively collects a refrigerant flow signal in a liquid pipe of the corresponding falling film evaporator and sends the refrigerant flow signal to a control panel of the water chilling unit;
(2) selecting one of the flow meters as a reference flow meter, taking a flow signal measured by the reference flow meter as a reference flow signal, taking an electronic expansion valve connected with the reference flow meter in series as a reference electronic expansion valve, and judging whether the received flow signals measured by the other flow meters are equal to the reference flow signal by a control board;
if not, the control board adjusts the opening degree of each electronic expansion valve except the reference electronic expansion valve and returns to the step (1);
and if so, keeping the current opening degree of each electronic expansion valve.
10. The control method according to claim 9, characterized in that: the control panel adjusts the opening degree of each electronic expansion valve except the reference electronic expansion valve, and the method specifically comprises the following steps:
and adjusting the opening degree of the electronic expansion valve connected in series with each flow meter except the reference flow meter according to the difference value of the flow signal of each flow meter except the reference flow meter and the reference flow signal.
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|---|---|---|---|
| CN201811141687.5A CN110966781A (en) | 2018-09-28 | 2018-09-28 | Water chilling unit and control method |
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| CN201811141687.5A CN110966781A (en) | 2018-09-28 | 2018-09-28 | Water chilling unit and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001194029A (en) * | 2000-01-05 | 2001-07-17 | Kubota Corp | Method for adjusting electronic expansion valve in refrigeration circuit |
| CN102032731A (en) * | 2010-12-08 | 2011-04-27 | 海尔集团公司 | Central air conditioner and method for controlling flow of refrigerant therein |
| CN204115285U (en) * | 2014-07-16 | 2015-01-21 | 江苏海雷德蒙新能源有限公司 | A kind of falling film type double parallel Screw chiller |
| CN204745701U (en) * | 2015-04-29 | 2015-11-11 | 杭州兴源节能环保科技有限公司 | Do not shut down shell -and -plate falling film evaporation device of scale removal |
| CN107543290A (en) * | 2017-09-04 | 2018-01-05 | 广东美的暖通设备有限公司 | Multi-online air-conditioning system control method and device and multi-online air-conditioning system |
| CN209101595U (en) * | 2018-09-28 | 2019-07-12 | 青岛海尔智能技术研发有限公司 | A kind of water cooler |
-
2018
- 2018-09-28 CN CN201811141687.5A patent/CN110966781A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001194029A (en) * | 2000-01-05 | 2001-07-17 | Kubota Corp | Method for adjusting electronic expansion valve in refrigeration circuit |
| CN102032731A (en) * | 2010-12-08 | 2011-04-27 | 海尔集团公司 | Central air conditioner and method for controlling flow of refrigerant therein |
| CN204115285U (en) * | 2014-07-16 | 2015-01-21 | 江苏海雷德蒙新能源有限公司 | A kind of falling film type double parallel Screw chiller |
| CN204745701U (en) * | 2015-04-29 | 2015-11-11 | 杭州兴源节能环保科技有限公司 | Do not shut down shell -and -plate falling film evaporation device of scale removal |
| CN107543290A (en) * | 2017-09-04 | 2018-01-05 | 广东美的暖通设备有限公司 | Multi-online air-conditioning system control method and device and multi-online air-conditioning system |
| CN209101595U (en) * | 2018-09-28 | 2019-07-12 | 青岛海尔智能技术研发有限公司 | A kind of water cooler |
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