CN112682976A - Evaporative water chilling unit and control method thereof - Google Patents
Evaporative water chilling unit and control method thereof Download PDFInfo
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- CN112682976A CN112682976A CN202110053607.6A CN202110053607A CN112682976A CN 112682976 A CN112682976 A CN 112682976A CN 202110053607 A CN202110053607 A CN 202110053607A CN 112682976 A CN112682976 A CN 112682976A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 108
- 238000005057 refrigeration Methods 0.000 claims abstract description 77
- 230000006835 compression Effects 0.000 claims abstract description 51
- 238000007906 compression Methods 0.000 claims abstract description 51
- 239000000498 cooling water Substances 0.000 claims abstract description 23
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 13
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002826 coolant Substances 0.000 claims description 4
- 239000008400 supply water Substances 0.000 claims description 3
- 230000007704 transition Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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Abstract
The present disclosure provides an evaporative water chilling unit and a control method thereof, the evaporative water chilling unit includes: the evaporator is communicated with a compression refrigeration loop and a natural cold source loop; the compression refrigeration loop comprises a compressor, a first heat exchanger and an expansion valve; the natural cold source loop comprises a cooling water pump and a second heat exchanger; and the cooling chamber is internally provided with a cooling fan, the first heat exchanger and the second heat exchanger are arranged in the cooling chamber, and the cooling fan is configured to increase the air volume flowing through the first heat exchanger and/or the second heat exchanger. The evaporative water chilling unit can utilize a natural cold source under the working condition of low environmental temperature, utilize a compressor to refrigerate under the working condition of high temperature, and simultaneously operate by adopting compression refrigeration and self-heating cold source refrigeration in transition seasons, so that the energy consumption of the water chilling unit is saved. The compression refrigeration and natural cold source refrigeration heat exchanger is designed in the same chamber, and the cooling fan can simultaneously work for the compression refrigeration and the natural cold source refrigeration, so that the energy efficiency level of the whole machine is improved.
Description
Technical Field
The disclosure belongs to the technical field of refrigeration equipment, and particularly relates to an evaporative water chilling unit and a control method thereof.
Background
The evaporation water chilling unit has more and more market demands due to huge potential in the aspect of energy efficiency, but because the evaporation water chilling unit needs to be refrigerated all the year round, the consumed energy is higher, and because the compressor refrigeration equipment runs all the year round, the reliability cannot be guaranteed.
Disclosure of Invention
Therefore, the technical problem to be solved by the present disclosure is to provide an evaporative water chilling unit and a control method thereof, wherein the evaporative water chilling unit can utilize a natural cold source under a low ambient temperature working condition and utilize a compressor for refrigeration under a high temperature working condition.
In order to solve the above problem, the present disclosure provides an evaporative water chilling unit, including:
the evaporator is communicated with a compression refrigeration loop and a natural cold source loop;
the compression refrigeration loop comprises a compressor, a first heat exchanger and an expansion valve; the natural cold source loop comprises a cooling water pump and a second heat exchanger;
and the cooling chamber is internally provided with a cooling fan, the first heat exchanger and the second heat exchanger are arranged in the cooling chamber, and the cooling fan is configured to increase the air volume flowing through the first heat exchanger and/or the second heat exchanger.
The purpose of the present disclosure and the technical problems solved thereby can be further achieved by the following technical measures.
In some embodiments, the first heat exchanger comprises at least one evaporative condenser comprising a shell and tube heat exchanger, a spray device configured to spray moisture onto the shell and tube heat exchanger.
In some embodiments, the spray device includes a circulation pump configured to supply water to the spray device.
In some embodiments, the second heat exchanger includes at least one cooling coil configured to cool the cooling medium in the natural cold source loop.
In some embodiments, there is at least one cooling fan, each cooling fan corresponding to at least one evaporative condenser and at least one cooling coil.
In some embodiments, the natural cold source loop includes a plate heat exchanger, the plate heat exchanger includes a first inlet, a first outlet, a second inlet, and a second outlet, the first inlet and the first outlet are communicated, the second inlet and the second outlet are communicated, the first inlet is connected to a chilled water inlet end, the first outlet is communicated to the natural cold source inlet of the evaporator, the second outlet is connected to an inlet of the cooling coil through a cooling water pump, an outlet of the cooling coil is communicated to the second inlet, and a circulation loop formed by the second outlet, the cooling water pump, the cooling coil, and the second inlet circulates a cold-carrying medium.
In some embodiments, the cold carrier medium comprises a glycol solution.
A control method adopting the evaporative water chilling unit comprises the following steps:
when T is more than T1, operating a compression refrigeration circulation mode, and supplying cold energy to the evaporator through a compression refrigeration loop;
when T1 is more than T2, the compression refrigeration circulation mode and the natural cooling circulation mode are operated simultaneously, and the refrigeration quantity is supplied to the evaporator through the compression refrigeration loop and the natural cold source loop;
when T is less than or equal to T2, a natural cooling circulation mode is operated, and cold energy is supplied to the evaporator through a natural cold source loop;
wherein T is the ambient temperature, T1 is the first preset temperature, T2 is the second preset temperature, and T1 > T2.
The purpose of the present disclosure and the technical problems solved thereby can be further achieved by the following technical measures.
In some embodiments, operating the compression refrigeration cycle mode comprises: controlling the opening of the circulating pump, the cooling fan, the compressor and the expansion valve;
and/or the presence of a gas in the gas,
operating the natural cooling cycle mode includes: and controlling the cooling water pump, the cooling fan and the plate heat exchanger to be started.
In some embodiments, simultaneously operating the compression refrigeration cycle mode, the free cooling cycle mode comprises: and controlling the working frequency of the cooling fan according to COP curves of the compression refrigeration loop and the natural cold source loop.
In some embodiments, the step of controlling the working frequency of the evaporative water chilling unit according to the COP curve of the compression refrigeration circuit and the natural cold source circuit comprises: and determining an optimal energy efficiency point in the COP curve, taking the temperature corresponding TO the optimal energy efficiency point as a reference temperature TO, when T is less than or equal TO TO, operating the cooling fan at the working frequency meeting the output power requirement of the natural cold source loop, and when T is more than TO, operating the cooling fan at the working frequency meeting the output power requirement of the compression refrigeration loop.
The evaporative water chilling unit and the control method thereof provided by the disclosure have at least the following beneficial effects:
the evaporative water chilling unit has the dual cooling functions of compression refrigeration and natural cold source refrigeration, can realize the utilization of the natural cold source under the working condition of low ambient temperature, utilizes the compressor for refrigeration under the working condition of high temperature, and adopts the simultaneous operation of the compression refrigeration and the self-heating cold source refrigeration in transition seasons, so that the energy consumption of the water chilling unit is saved. The compression refrigeration and natural cold source refrigeration heat exchanger is designed in the same chamber, and the cooling fan can simultaneously perform compression refrigeration and natural cold source refrigeration work, so that the heat exchange efficiency is improved and the energy efficiency level of the whole machine is improved by increasing the air quantity flowing through the heat exchanger.
Drawings
Fig. 1 is a schematic structural diagram of an evaporative water chilling unit according to an embodiment of the present disclosure;
fig. 2 is a COP curve diagram according to an embodiment of the disclosure.
The reference numerals are represented as:
1. a compressor; 2. an evaporative condenser; 3. an expansion valve; 4. an evaporator; 5. a plate heat exchanger; 6. a circulation pump; 7. a cooling water pump; 8. a cooling coil; 9. a cooling fan; 10. a first inlet; 11. a first outlet; 12. a second inlet; 13. a second outlet.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, the following embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the disclosed embodiments and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
As shown in fig. 1, the present embodiment provides an evaporative water chilling unit, including: the evaporator 4 is communicated with a compression refrigeration loop and a natural cold source loop; the compression refrigeration loop comprises a compressor 1, a first heat exchanger and an expansion valve 3; the natural cold source loop comprises a cooling water pump 7 and a second heat exchanger; and a cooling chamber in which a cooling fan 9 is arranged, the first heat exchanger and the second heat exchanger are arranged in the cooling chamber, and the cooling fan 9 is configured to increase the air volume flowing through the first heat exchanger and/or the second heat exchanger.
The evaporative water chilling unit has the dual cooling functions of compression refrigeration and natural cold source refrigeration, can realize the utilization of the natural cold source under the working condition of low ambient temperature, utilizes the compressor 1 for refrigeration under the working condition of high temperature, and simultaneously operates by adopting the compression refrigeration and the self-heating cold source refrigeration in transition seasons, so that the energy consumption of the water chilling unit is saved. The cooling fan 9 can simultaneously perform compression refrigeration and natural cold source refrigeration, and the heat exchange efficiency and the energy efficiency level of the whole machine are improved by increasing the air quantity flowing through the heat exchanger.
In some embodiments, the first heat exchanger comprises at least one evaporative condenser 2, the at least one evaporative condenser 2 comprising a shell and tube heat exchanger, a spray device configured to spray moisture onto the shell and tube heat exchanger. The shell and tube heat exchanger is matched with the spraying device, so that the heat exchange efficiency of the shell and tube heat exchanger is improved.
In some embodiments, the spray device comprises a circulation pump 6, the circulation pump 6 being configured to supply water to the spray device. The circulating pump 6 improves the water supply performance of the spraying device and ensures the heat exchange efficiency of the shell-and-tube heat exchanger.
In some embodiments, the second heat exchanger includes at least one cooling coil 8, the cooling coil 8 configured to cool the cooling medium in the natural cold source loop. The refrigeration of the natural cold source cools the circulating secondary refrigerant through the cooling coil 8, reduces the temperature of the chilled water flowing through the evaporator 4, and increases the refrigeration capacity of the refrigeration of the natural cold source.
In some embodiments, there is at least one cooling fan 9, and each cooling fan 9 corresponds to at least one evaporative condenser 2 and at least one cooling coil 8. This embodiment is through carrying out the heat dissipation cooling for evaporative condenser 2 and cooling coil 8 simultaneously at a cooling blower 9, the efficiency level of the promotion complete machine of maximize.
In some embodiments, the natural cold source loop includes a plate heat exchanger 5, the plate heat exchanger 5 includes a first inlet 10, a first outlet 11, a second inlet 12, and a second outlet 13, the first inlet 10 and the first outlet 11 are communicated, the second inlet 12 and the second outlet 13 are communicated, the first inlet 10 is connected to a chilled water inlet, the first outlet 11 is communicated to the natural cold source inlet of the evaporator 4, the second outlet 13 is connected to the inlet of the cooling coil 8 through the cooling water pump 7, the outlet of the cooling coil 8 is communicated to the second inlet 12, and a circulation loop formed by the second outlet 13, the cooling water pump 7, the cooling coil 8, and the second inlet 12 circulates a cold carrying medium. Chilled water circulates along a loop of a first inlet 10, a plate heat exchanger 5, a first outlet 11, an evaporator 4 and the first inlet 10, a cold-carrying medium circulates along a loop of a cooling water pump 7, a cooling coil 8, a second inlet 12, the plate heat exchanger 5, a second outlet 13 and the cooling water pump 7, the chilled water and the cold-carrying medium exchange heat in the plate heat exchanger 5, firstly, the cooling coil 8 absorbs external environment cold into the cold-carrying medium, the cold-carrying medium carries the cold to the plate heat exchanger 5 and transmits the cold to the chilled water in the plate heat exchanger 5, and the chilled water carries the cold to the evaporator 4 to finish refrigeration of a natural cold source.
In some embodiments, the cold carrier medium comprises a glycol solution. The glycol solution as the secondary refrigerant has the advantages of large cold requirement and quick heat exchange.
Referring to fig. 2, this embodiment provides a control method using the evaporative water chilling unit, including:
and when T is more than T1, the component operates in a high ambient temperature condition. A compression refrigeration circulation mode is operated, and refrigeration capacity is supplied to the evaporator 4 through a compression refrigeration loop; the refrigerant runs through a circulation loop formed by the compressor 1, the evaporative condenser 2, the expansion valve 3 and the compressor 1, and 100% of output is output for running; at this time, the natural cooling circulation circuit is stopped and closed.
In some embodiments, the chilled water may be passed through the first inlet 10-plate heat exchanger 5-first outlet 11-evaporator 4-chilled water outlet; and performing cold compensation on the compression refrigeration cycle.
Component operation control mode: the circulating pump 6, the cooling fan 9, the compressor 1 and the expansion valve 3 are opened, and the cooling water pump 7 is closed.
When T1 is more than T2, the unit operates in a transition season working condition. Simultaneously operating a compression refrigeration circulation mode and a natural cooling circulation mode, and supplying cold energy to the evaporator 4 through a compression refrigeration loop and a natural cold source loop;
natural cooling circulation mode: a cold-carrying medium (glycol solution) runs at 100% output power through a cooling water pump 7-cooling coil 8-plate heat exchanger 5-cooling water pump 7 circulation loop;
compression refrigeration cycle mode: the refrigerant operation is a circulation loop formed by a compressor 1, an evaporative condenser 2, an electronic expansion valve 3, an evaporator 4 and the compressor 1, and the refrigerant operation is controlled to operate at partial load output power in an interval range of 0-25% -50% -75% -100% by frequency conversion; the chilled water is discharged through the first inlet 10, the plate heat exchanger 5, the first outlet 11, the evaporator 4 and the chilled water, and natural cooling circulation cold energy is conveyed.
Component operation control mode: and the cooling fan 9, the cooling water pump 7 and the plate heat exchanger 5 are started, and the circulating pump 6, the compressor 1 and the expansion valve 3 perform frequency conversion partial load operation.
And when T is less than or equal to T2, the unit operates under the working condition of low ambient temperature. A natural cooling circulation mode is operated, and cold energy is supplied to the evaporator 4 through a natural cold source loop;
natural cooling circulation mode: a cold-carrying medium (glycol solution) runs at 100% output power through a cooling water pump 7-cooling coil 8-plate heat exchanger 5-cooling water pump 7 circulation loop; at this time, the compression refrigeration cycle is stopped and closed. The chilled water is discharged through the first inlet 10, the plate heat exchanger 5, the first outlet 11, the evaporator 4 and the chilled water, and natural cooling circulation cold energy is conveyed.
Component operation control mode: the cooling fan 9, the cooling water pump 7 and the plate heat exchanger 5 are started, and the circulating pump 6, the compressor 1 and the expansion valve 3 are closed; the cooling water pump 7 is used as a power source, heat in the plate heat exchanger 5 is transported to the outdoor cooling coil 8 side through a natural cooling circulation cold carrying medium (glycol solution), and is discharged outdoors through the cooling fan 9, so that refrigeration is realized.
Wherein T is the ambient temperature, T1 is the first preset temperature, T2 is the second preset temperature, and T1 > T2. Preferably, T1 is 15 ℃ and T2 is 2 ℃.
In some embodiments, simultaneously operating the compression refrigeration cycle mode, the free cooling cycle mode comprises: and controlling the working frequency of the cooling fan according to COP curves of the compression refrigeration loop and the natural cold source loop.
Under the working condition of a transition season, the natural cooling circulation mode is preferred under the condition that the cold load demand is lower. The refrigeration capacity can not meet the set requirement or the outlet water temperature of the chilled water can not meet the set requirement, the compression refrigeration circulation mode is started, but the air chambers of the refrigeration mode and the natural cooling mode of the compressor 1 are the same. The air volume of the fan is large in the 100% natural cooling mode, the power consumption of the fan is large and is 2-4 times of the air volume of the fan in the compressor 1 machine cooling mode, and the power of the fan is low. The compression refrigeration mode is prioritized at high temperature, so that the overall energy consumption is prevented from being overlarge.
Meanwhile, the problem of landscape caused by the fact that spray water flows out along with the cooling fan 9 in the compression refrigeration circulation mode of section operation when the air quantity of the cooling fan 9 is too large in the natural cooling circulation mode of priority operation is prevented.
The running of the unit is guided and controlled by the COP optimal energy efficiency curve, the problem of no floating water is solved, and under the same cooling capacity, the running frequency of the cooling fan 9 is adjusted according to the natural cooling mode or the cooling mode of the compressor 1 is adjusted.
In some embodiments, the step of controlling the working frequency of the evaporative water chilling unit according to the COP curve of the compression refrigeration circuit and the natural cold source circuit comprises: and determining an optimal energy efficiency point in the COP curve, taking the temperature corresponding TO the optimal energy efficiency point as a reference temperature TO, when T is less than or equal TO TO, operating the cooling fan at the working frequency meeting the output power requirement of the natural cold source loop, and when T is more than TO, operating the cooling fan at the working frequency meeting the output power requirement of the compression refrigeration loop.
Examples are: at 10 ℃, a is the optimal energy efficiency point, B is the water flying point of the compressor 1 during the cooling operation, and B may be on the left side or the right side of a due to different working conditions and loads.
And when the point B is on the right side of the point A, preferentially operating the mode with the highest energy efficiency, namely controlling the cooling fan to operate at the working frequency meeting the output power requirement of the compression refrigeration loop.
And when the point B is on the left side of the point A, the operation mode of no water flying is preferentially ensured, and the cooling fan operates at the working frequency meeting the output power requirement of the natural cold source loop.
Therefore, the problems that the running energy consumption of the fan is high and the energy-saving effect of the whole machine is poor due to the fact that the cooling fan runs at a large working frequency required by natural cooling circulation all the time in a transition season of the evaporative water chilling unit with the natural cooling circulation can be solved.
The control method disclosed by the invention can perform optimal energy efficiency optimizing operation according to different working conditions and operation modes, adjust the refrigeration proportion of the refrigeration cycle and the natural cooling cycle of the compressor 1, and realize high-efficiency operation under all working conditions and all environment temperatures.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present disclosure is to be considered as limited only by the preferred embodiments and not limited to the specific embodiments described herein, and all changes, equivalents and modifications that come within the spirit and scope of the disclosure are desired to be protected. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present disclosure, and these improvements and modifications should also be considered as the protection scope of the present disclosure.
Claims (11)
1. An evaporative water chilling unit, comprising:
the evaporator (4) is communicated with a compression refrigeration loop and a natural cold source loop;
the compression refrigeration loop comprises a compressor (1), a first heat exchanger and an expansion valve (3); the natural cold source loop comprises a cooling water pump (7) and a second heat exchanger;
a cooling chamber, wherein a cooling fan (9) is arranged in the cooling chamber, the first heat exchanger and the second heat exchanger are arranged in the cooling chamber, and the cooling fan (9) is configured to increase the air quantity flowing through the first heat exchanger and/or the second heat exchanger.
2. The evaporative water chilling unit according to claim 1, wherein the first heat exchanger comprises at least one evaporative condenser (2), the at least one evaporative condenser (2) comprising a shell and tube heat exchanger, a spray device configured to spray moisture onto the shell and tube heat exchanger.
3. Evaporative water chilling unit according to claim 2, characterized in that the spray device comprises a circulation pump (6), the circulation pump (6) being configured to supply water to the spray device.
4. The evaporative water chilling unit according to claim 1, wherein the second heat exchanger includes at least one cooling coil (8), the cooling coil (8) being configured to cool down and dissipate heat from the cooling medium in the natural cold source circuit.
5. Evaporative water chilling unit according to claim 4, characterised in that the number of cooling fans (9) is at least one, each cooling fan (9) corresponding to at least one evaporative condenser (2) and at least one cooling coil (8).
6. The evaporative water chilling unit according to claim 4, wherein the natural cold source loop comprises a plate type heat exchanger (5), the plate type heat exchanger (5) comprises a first inlet (10), a first outlet (11), a second inlet (12) and a second outlet (13), the first inlet (10) and the first outlet (11) are communicated, the second inlet (12) and the second outlet (13) are communicated, the first inlet (10) is connected with a chilled water inlet end, the first outlet (11) is communicated to the natural cold source inlet of the evaporator (4), the second outlet (13) is connected to the inlet of the cooling coil (8) through a cooling water pump (7), the outlet of the cooling coil (8) is communicated to the second inlet (12), and the second outlet (13), the cooling water pump (7), the cooling coil (8), The circulation circuit formed by the second inlet (12) is circulated with the cooling medium.
7. The evaporative water chilling unit according to claim 6, wherein the cold carrying medium includes a glycol solution.
8. A control method using the evaporative water chilling unit according to any one of claims 1 to 7, comprising:
when T is more than T1, operating a compression refrigeration circulation mode, and supplying cold energy to the evaporator (4) through a compression refrigeration loop;
when T1 is more than T2, the compression refrigeration circulation mode and the natural cooling circulation mode are operated simultaneously, and the evaporator (4) is supplied with cold energy through the compression refrigeration loop and the natural cold source loop;
when T is less than or equal to T2, a natural cooling circulation mode is operated, and cold energy is supplied to the evaporator (4) through a natural cold source loop;
wherein T is the ambient temperature, T1 is the first preset temperature, T2 is the second preset temperature, and T1 > T2.
9. The evaporative water chilling unit control method according to claim 8, wherein the operating the compression refrigeration cycle mode includes: controlling the circulation pump (6), the cooling fan (9), the compressor (1) and the expansion valve (3) to be opened;
and/or the presence of a gas in the gas,
the operating natural cooling cycle mode includes: and controlling the cooling water pump (7), the cooling fan (9) and the plate heat exchanger (5) to be started.
10. The evaporative water chilling unit control method according to claim 8, wherein the step of simultaneously operating the compression refrigeration cycle mode and the natural cooling cycle mode includes: and controlling the working frequency of the cooling fan according to COP curves of the compression refrigeration loop and the natural cold source loop.
11. The method for controlling an evaporative water chilling unit according to claim 8, wherein the step of controlling the operating frequency of the evaporative water chilling unit according to the COP curves of the compression refrigeration circuit and the natural cold source circuit includes: and determining an optimal energy efficiency point in the COP curve, taking the temperature corresponding TO the optimal energy efficiency point as a reference temperature TO, when T is less than or equal TO TO, operating the cooling fan at the working frequency meeting the output power requirement of the natural cold source loop, and when T is more than TO, operating the cooling fan at the working frequency meeting the output power requirement of the compression refrigeration loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110053607.6A CN112682976A (en) | 2021-01-15 | 2021-01-15 | Evaporative water chilling unit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110053607.6A CN112682976A (en) | 2021-01-15 | 2021-01-15 | Evaporative water chilling unit and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113899053A (en) * | 2021-10-08 | 2022-01-07 | 珠海格力电器股份有限公司 | Natural cooling air conditioning unit and anti-freezing control method and device thereof |
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| CN101988722A (en) * | 2010-10-27 | 2011-03-23 | 郭海新 | Natural cold source cooling water chiller |
| KR101727561B1 (en) * | 2016-01-27 | 2017-05-02 | 한국이미지시스템(주) | Energy-saving industrial air-conditioner and the operation method |
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Application publication date: 20210420 |