CN113154721B - Novel energy-saving water chilling unit - Google Patents
Novel energy-saving water chilling unit Download PDFInfo
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- CN113154721B CN113154721B CN202110420894.XA CN202110420894A CN113154721B CN 113154721 B CN113154721 B CN 113154721B CN 202110420894 A CN202110420894 A CN 202110420894A CN 113154721 B CN113154721 B CN 113154721B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000000498 cooling water Substances 0.000 claims abstract description 92
- 238000001816 cooling Methods 0.000 claims abstract description 56
- 230000006835 compression Effects 0.000 claims abstract description 55
- 238000007906 compression Methods 0.000 claims abstract description 55
- 230000005484 gravity Effects 0.000 claims abstract description 54
- 238000005057 refrigeration Methods 0.000 claims abstract description 53
- 239000003507 refrigerant Substances 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims description 39
- 239000007921 spray Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 description 13
- 238000005265 energy consumption Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- 230000005494 condensation Effects 0.000 description 8
- 238000009833 condensation Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
本发明公开了一种新型节能冷水机组，由蒸汽压缩制冷循环管路、重力热管循环管路和冷却水循环管路组成，蒸汽压缩制冷循环管路流通有制冷工质，重力热管循环管路流通有热管介质，冷却水循环管路流通有冷却水，蒸汽压缩制冷循环管路通过第一冷凝器与重力热管循环管路相连接，蒸汽压缩制冷循环管路通过第二冷凝器与冷却水循环管路相连接，重力热管循环管路通过蒸发式冷却塔与冷却水循环管路相连接，蒸汽压缩制冷循环管路通过蒸发器与外部用于流通冷冻水的冷冻水管路相连接。本发明在组成普通水冷式冷水机组的蒸汽压缩制冷循环管路与冷却水循环管路的基础上耦合无需消耗电能的重力热管循环管路，充分利用自然冷源，实现机组能效提升。
The present invention discloses a novel energy-saving chiller, which is composed of a steam compression refrigeration circulation pipeline, a gravity heat pipe circulation pipeline and a cooling water circulation pipeline. A refrigerant flows through the steam compression refrigeration circulation pipeline, a heat pipe medium flows through the gravity heat pipe circulation pipeline, cooling water flows through the cooling water circulation pipeline, the steam compression refrigeration circulation pipeline is connected to the gravity heat pipe circulation pipeline through a first condenser, the steam compression refrigeration circulation pipeline is connected to the cooling water circulation pipeline through a second condenser, the gravity heat pipe circulation pipeline is connected to the cooling water circulation pipeline through an evaporative cooling tower, and the steam compression refrigeration circulation pipeline is connected to an external chilled water pipeline for circulating chilled water through an evaporator. The present invention couples a gravity heat pipe circulation pipeline that does not consume electrical energy on the basis of the steam compression refrigeration circulation pipeline and the cooling water circulation pipeline that constitute an ordinary water-cooled chiller, makes full use of natural cold sources, and realizes the improvement of the unit's energy efficiency.
Description
Technical Field
The invention relates to the technical field of water chilling units, in particular to a novel energy-saving water chilling unit.
Background
At present, the energy structure of China mainly uses coal, and a large amount of energy consumption brings serious environmental pollution and greenhouse gas emission. The total energy consumption of the buildings in China exceeds 8 hundred million tons of standard coal, occupies about 20% of the total energy consumption in China, and continues to grow at a high speed along with the economic development of China. The heating ventilation air conditioning system is the system with the largest energy consumption in the building, and the energy consumption of the heating ventilation air conditioning system occupies about 40 percent of the energy consumption of the whole building. The water chilling unit is energy-consuming equipment with the maximum energy consumption of the heating ventilation air conditioning system, and the reduction of the operation energy consumption of the water chilling unit has important significance for energy conservation and emission reduction and green development.
Disclosure of Invention
The invention aims to provide a novel energy-saving water chilling unit, which realizes the energy efficiency improvement of a vapor compression refrigeration cycle pipeline by adopting an evaporation type cooling tower, is coupled with a gravity heat pipe cycle pipeline which does not need to consume electric energy on the basis of the vapor compression refrigeration cycle pipeline and a cooling water cycle pipeline which form a common water-cooled water chilling unit, fully utilizes a natural cold source, greatly reduces the running time and the running lift of a cooling water pump in the cooling water cycle pipeline, realizes the energy efficiency improvement of the cooling water cycle pipeline, and solves the problem of high energy consumption of the water chilling unit in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The utility model provides a novel energy-conserving cooling water set, cooling water set comprises vapor compression refrigeration circulation pipeline, gravity heat pipe circulation pipeline and cooling water circulation pipeline, vapor compression refrigeration circulation pipeline circulation has refrigerating medium, gravity heat pipe circulation pipeline circulation has the heat pipe medium, cooling water circulation pipeline circulation has cooling water, vapor compression refrigeration circulation pipeline pass through first condenser with gravity heat pipe circulation pipeline is connected, vapor compression refrigeration circulation pipeline pass through the second condenser with cooling water circulation pipeline is connected, gravity heat pipe circulation pipeline pass through the evaporative cooling tower with cooling water circulation pipeline is connected, vapor compression refrigeration circulation pipeline passes through the evaporimeter and is used for the freezing water pipeline of circulation frozen water to be connected.
Further, the first condenser is provided with a first passage as a part of the vapor compression refrigeration cycle line and a second passage as a part of the gravity assisted heat pipe cycle line, the second condenser is provided with a third passage as a part of the vapor compression refrigeration cycle line and a fourth passage as a part of the cooling water cycle line, the evaporator is provided with a fifth passage as a part of the vapor compression refrigeration cycle line and a sixth passage as a part of the chilled water cycle line, and the evaporative cooling tower is provided with a seventh passage as a part of the gravity assisted heat pipe cycle line and an eighth passage as a part of the cooling water cycle line.
Further, the vapor compression refrigeration cycle pipeline comprises a compressor, a first valve, a first channel of a first condenser, a third channel of a second condenser, a liquid storage tank, a throttling device, a fifth channel of an evaporator and a second valve, wherein the compressor, the first valve, the first channel of the first condenser, the third channel of the second condenser, the liquid storage tank, the throttling device and the fifth channel of the evaporator are sequentially connected through pipelines, one end of the second valve is connected with the pipeline between the compressor and the first valve, and the other end of the second valve is connected with the pipeline between the first channel of the first condenser and the third channel of the second condenser. Thus, the high-temperature and high-pressure steam formed by compression of the compressor can be selectively flowed into the second condenser through the first condenser, or directly flowed into the second condenser.
Further, the gravity assisted heat pipe circulation pipeline comprises a second channel of the first condenser and a seventh channel of the evaporative cooling tower, and the second channel of the first condenser and the seventh channel of the evaporative cooling tower are connected through a pipeline to form the gravity assisted heat pipe circulation pipeline. The heat pipe medium in the gravity heat pipe circulation pipeline exchanges heat with high-temperature and high-pressure steam formed by compression of the compressor at the first condenser, and the heat pipe medium in the gravity heat pipe circulation pipeline after the heat exchange is cooled and condensed by utilizing a natural cold source in the evaporative cooling tower and flows back to the first condenser to be gasified again under the action of gravity.
Further, the cooling water circulation pipeline comprises a fourth channel of the second condenser, a cooling water pump, an eighth channel of the evaporative cooling tower, a third valve and a fourth valve, wherein the fourth channel of the second condenser, the cooling water pump, the eighth channel of the evaporative cooling tower and the third valve are sequentially connected through pipelines, one end of the fourth valve is connected with a pipeline between the eighth channel of the evaporative cooling tower and the third valve, and the other end of the fourth valve is connected with a pipeline between the fourth channel of the second condenser and the cooling water pump. The cooling water after heat exchange with the heat pipe medium in the evaporative cooling tower can be pumped back to the evaporative cooling tower directly through the fourth valve for continuous heat exchange, or enter the second condenser through the third valve for further heat exchange with the refrigerating working medium in the vapor compression refrigeration cycle pipeline, and then be pumped back to the evaporative cooling tower for continuous heat exchange through the cooling water pump.
Preferably, the first condenser is a shell-and-tube heat exchanger, the first channel is located at a shell side of the first condenser, the second channel is located in a tube of the first condenser, and a flow direction of a refrigerating working medium in the first channel is opposite to a flow direction of a heat pipe medium in the second channel, so that the heat exchange efficiency is better.
Preferably, the second condenser is a shell-and-tube heat exchanger, the third channel is located at a shell side of the second condenser, the fourth channel is located in a tube of the second condenser, and a flow direction of the refrigerant in the third channel is opposite to a flow direction of the cooling water in the fourth channel, so that the heat exchange efficiency is better.
Preferably, the evaporator is a shell-and-tube heat exchanger, the fifth channel is located at the shell side of the evaporator, the sixth channel is located in a tube of the evaporator, and the flow direction of the refrigerant in the fifth channel is opposite to the flow direction of the chilled water in the sixth channel, so that the evaporator has better heat exchange efficiency.
Further, the evaporative cooling tower is further provided with a fan, and the eighth passage comprises a spray pipe for spraying water to cool towards the seventh passage and a return pipe for collecting water. Through setting up the fan, can accelerate the heat pipe medium in the gravity heat pipe circulation pipeline and the heat dissipation of the cooling water in the cooling water circulation pipeline, improve heat exchange efficiency.
Preferably, the first channel, the second channel, the third channel, the fourth channel, the fifth channel, the sixth channel and the seventh channel are all pipes distributed in a serpentine shape, so that the heat exchange efficiency is better.
Compared with the prior art, the invention provides a novel energy-saving water chilling unit, which has the following beneficial effects:
1. Compared with a common water-cooled chiller, the condensing temperature of the vapor compression refrigeration cycle pipeline is reduced, the energy consumption of the compressor in the vapor compression refrigeration cycle pipeline is greatly reduced, and the overall energy efficiency is improved.
2. The heat pipe medium in the gravity heat pipe circulation pipeline flows back to the first condenser from the evaporative cooling tower under the action of gravity and is gasified again, so that the gravity heat pipe circulation pipeline is repeatedly circulated without consuming electric energy.
3. According to the invention, the gravity heat pipe circulation pipeline is coupled on the basis of the vapor compression refrigeration circulation pipeline and the cooling water circulation pipeline which form the common water-cooled water chilling unit, so that the natural cold source is fully utilized, the running time and the running lift of the cooling water pump in the cooling water circulation pipeline are greatly reduced, the running energy consumption of the cooling water pump is greatly reduced, and the overall energy efficiency is further improved.
4. According to the invention, the energy efficiency of the vapor compression refrigeration circulation pipeline and the cooling water circulation pipeline is improved, meanwhile, the gravity heat pipe circulation pipeline runs without consuming electric energy, and the whole energy-saving effect of the water chilling unit formed by the three pipelines is obvious.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 shows the state of the devices in different modes according to the present invention;
FIG. 3 is a schematic diagram of the operation of the present invention in a dry-cold mode;
FIG. 4 is a schematic diagram of the operation of the present invention in an evaporative cooling mode;
FIG. 5 is a schematic diagram of the operation of the present invention in a combined mode;
FIG. 6 is a schematic diagram of the operation of the present invention in a water cooling mode.
The reference numerals are 1, a compressor, 2, a first condenser, 21, a first channel, 22, a second channel, 3, a second condenser, 31, a third channel, 32, a fourth channel, 4, a liquid storage tank, 5, a throttling device, 6, an evaporator, 61, a fifth channel, 62, a sixth channel, 7, an evaporative cooling tower, 71, a seventh channel, 72, an eighth channel, 8, a cooling water pump, 9, a fan, 10, a chilled water pipeline, a first valve, b, a second valve, c, a third valve, d, a fourth valve.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below by means of detailed embodiments in conjunction with the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1-6, the present embodiment provides a novel energy-saving water chiller, which is composed of a vapor compression refrigeration cycle pipeline, a gravity heat pipe cycle pipeline and a cooling water cycle pipeline, wherein a refrigeration working medium flows through the vapor compression refrigeration cycle pipeline, a heat pipe medium flows through the gravity heat pipe cycle pipeline, cooling water flows through the cooling water cycle pipeline, the vapor compression refrigeration cycle pipeline is connected with the gravity heat pipe cycle pipeline through a first condenser 2, the vapor compression refrigeration cycle pipeline is connected with the cooling water cycle pipeline through a second condenser 3, the gravity heat pipe cycle pipeline is connected with the cooling water cycle pipeline through an evaporative cooling tower 7, and the vapor compression refrigeration cycle pipeline is connected with a water pipe 10 for circulating chilled water through an evaporator 6. By adopting the evaporative cooling tower 7, the energy efficiency of the vapor compression refrigeration cycle pipeline is improved, meanwhile, the gravity heat pipe cycle pipeline which does not need to consume electric energy is coupled on the basis of the vapor compression refrigeration cycle pipeline and the cooling water cycle pipeline which form the common water-cooled chiller, a natural cold source is fully utilized, the running time and the running lift of the cooling water pump 8 in the cooling water cycle pipeline are greatly reduced, and the energy efficiency improvement of the cooling water cycle pipeline is realized.
Wherein the first condenser 2 is provided with a first passage 21 as part of the vapor compression refrigeration cycle and a second passage 22 as part of the gravity assisted heat pipe cycle. The second condenser 3 is provided with a third passage 31 as a part of the vapor compression refrigeration cycle line and a fourth passage 32 as a part of the cooling water circulation line. The evaporator 6 is provided with a fifth passage 61 as a part of the vapor compression refrigeration cycle line and a sixth passage 62 as a part of the chilled water line 10. The evaporative cooling tower 7 is provided with a seventh channel 71 as part of the gravity assisted heat pipe circulation line and an eighth channel 72 as part of the cooling water circulation line.
Specifically, the vapor compression refrigeration cycle pipeline includes a compressor 1, a first valve a, a first channel 21 of a first condenser 2, a third channel 31 of a second condenser 3, a liquid storage tank 4, a throttling device 5, a fifth channel 61 of an evaporator 6, and a second valve b, wherein the compressor 1, the first valve a, the first channel 21 of the first condenser 2, the third channel 31 of the second condenser 3, the liquid storage tank 4, the throttling device 5, and the fifth channel 61 of the evaporator 6 are sequentially connected through pipes, one end of the second valve b is connected with a pipe between the compressor 1 and the first valve a, and the other end of the second valve b is connected with a pipe between the first channel 21 of the first condenser 2 and the third channel 31 of the second condenser 3. In this way, the high-temperature and high-pressure vapor compressed by the compressor 1 may be selectively passed through the first condenser 2 and then flowed into the second condenser 3, or may be selectively flowed directly into the second condenser 3.
The gravity assisted heat pipe circulation pipeline comprises a second channel 22 of the first condenser 2 and a seventh channel 71 of the evaporative cooling tower 7, and the second channel 22 of the first condenser 2 and the seventh channel 71 of the evaporative cooling tower 7 are connected through a pipeline to form the gravity assisted heat pipe circulation pipeline. The heat pipe medium in the gravity heat pipe circulation pipeline exchanges heat with high-temperature and high-pressure steam formed by compression of the compressor 1 at the first condenser 2, and the heat pipe medium in the gravity heat pipe circulation pipeline after the heat exchange is cooled and condensed by utilizing a natural cold source in the evaporative cooling tower 7 and flows back to the first condenser 2 for gasification again under the action of gravity.
The cooling water circulation pipeline comprises a fourth channel 32 of the second condenser 3, a cooling water pump 8, an eighth channel 72 of the evaporative cooling tower 7, a third valve c and a fourth valve d, wherein the fourth channel 32 of the second condenser 3, the cooling water pump 8, the eighth channel 72 of the evaporative cooling tower 7 and the third valve c are sequentially connected through pipelines, one end of the fourth valve d is connected with a pipeline between the eighth channel 72 of the evaporative cooling tower 7 and the third valve c, and the other end of the fourth valve d is connected with a pipeline between the fourth channel 32 of the second condenser 3 and the cooling water pump 8. In this way, the cooling water in the evaporative cooling tower 7 after heat exchange with the heat pipe medium can be pumped back to the evaporative cooling tower 7 directly through the fourth valve d for continuous heat exchange, or the cooling water enters the second condenser 3 through the third valve c for further heat exchange with the refrigerating working medium in the vapor compression refrigeration cycle pipeline, and then is pumped back to the evaporative cooling tower 7 by the cooling water pump 8 for continuous heat exchange.
In some specific embodiments, the first condenser 2 is a shell-and-tube heat exchanger, the first channel 21 is located on the shell side of the first condenser 2, the second channel 22 is located in a tube of the first condenser 2, and the flow direction of the refrigerant medium in the first channel 21 is opposite to the flow direction of the heat pipe medium in the second channel 22, so that better heat exchange efficiency is achieved.
In some specific embodiments, the second condenser 3 is a shell-and-tube heat exchanger, the third channel 31 is located on the shell side of the second condenser 3, the fourth channel 32 is located in the tube of the second condenser 3, and the flow direction of the refrigerant in the third channel 31 is opposite to the flow direction of the cooling water in the fourth channel 32, so that the heat exchange efficiency is better.
In some specific embodiments, the evaporator 6 is a shell-and-tube heat exchanger, the fifth channel 61 is located on the shell side of the evaporator 6, the sixth channel 62 is located in a tube of the evaporator 6, and the flow direction of the refrigerant in the fifth channel 61 is opposite to the flow direction of the chilled water in the sixth channel 62, so that the heat exchange efficiency is better.
In some specific embodiments, the evaporative cooling tower 7 is further provided with a fan 9, and the eighth passage 72 includes a spray pipe for spraying water to cool toward the seventh passage 71 and a return pipe for collecting water. By arranging the fan 9, heat dissipation of heat pipe media in the gravity heat pipe circulation pipeline and cooling water in the cooling water circulation pipeline can be accelerated, and heat exchange efficiency is improved.
In some specific embodiments, for better heat exchange efficiency, the first channel 21, the second channel 22, the third channel 31, the fourth channel 32, the fifth channel 61, the sixth channel 62 and the seventh channel 71 are preferably arranged as serpentine distribution pipes.
It should be noted that, in order to facilitate observation and adjustment, the novel energy-saving water chiller is further provided with components such as an instrument panel and a controller, so as to monitor and adjust the running state of each device in the working process. Parameters such as the temperature, humidity, outlet air temperature (temperature of hot and humid air), power supply indication, operation of the compressor 1, operation of the throttling device 5, operation of the cooling water pump 8, operation of the fan 9, operation of the first valve a, operation of the second valve b, operation of the third valve c, operation of the fourth valve d and the like in the water chilling unit can be controlled and displayed on the instrument panel.
Referring to fig. 2 to 6, the novel energy-saving water chilling unit can realize four operation modes, namely a dry cooling mode, an evaporation cooling mode, a combined mode and a water cooling mode by opening or closing the first valve a, the second valve b, the third valve c, the fourth valve d and the cooling water pump 8. Four modes of operation will be described in detail below, wherein the direction indicated by the thin straight arrow is the direction of flow of refrigerant in the vapor compression refrigeration cycle, the direction indicated by the solid arrow is the direction of flow of heat pipe medium in the gravity assisted heat pipe cycle, the direction indicated by the thin broken arrow is the direction of flow of cooling water in the cooling water cycle, and the direction indicated by the hollow arrow is the direction of flow of chilled water in the chilled water circuit 10.
(1) Dry cooling mode referring to fig. 3, when the air temperature is low, the cooling water pump 8 is turned off, the blower 9 is turned on, the first valve a is turned on, the second valve b, the third valve c and the fourth valve d are turned off, and the compressor 1 and the throttle device 5 are operated. The compressor 1 in the vapor compression refrigeration cycle pipeline compresses low-temperature low-pressure refrigerant vapor into high-temperature high-pressure vapor, the high-temperature high-pressure vapor is condensed into high-pressure liquid in the first condenser 2, the high-pressure refrigerant liquid coming out of the first condenser 2 sequentially flows into the throttling device 5 through the second condenser 3 and the liquid storage tank 4, the high-pressure refrigerant liquid enters the evaporator 6 after being throttled by the throttling device 5 to form a gas-liquid mixture, the gas-liquid mixture in the evaporator 6 absorbs heat of chilled water in the chilled water pipeline 10 to become low-pressure refrigerant gas, and the low-pressure refrigerant gas enters the compressor 1 to be compressed. The liquid heat pipe medium in the gravity heat pipe circulation pipeline absorbs heat released by high-temperature and high-pressure steam phase-change condensation in the first condenser 2 to gasify, the gasified gaseous heat pipe medium transfers phase-change condensation heat to the external environment by the action of the fan 9 in the evaporative cooling tower 7, and the condensed liquid heat pipe medium flows back to the first condenser 2 from the evaporative cooling tower 7 under the action of gravity and gasifies again. In the mode, the vapor compression refrigeration cycle pipeline and the gravity heat pipe cycle pipeline are combined to operate, so that the low-temperature chilled water is prepared.
(2) In the evaporative cooling mode, referring to fig. 4, when the air temperature is low, the cooling water pump 8 and the fan 9 are turned on, the first valve a and the fourth valve d are turned on, the second valve b and the third valve c are turned off, and the compressor 1 and the throttling device 5 are operated. The compressor 1 in the vapor compression refrigeration cycle pipeline compresses low-temperature low-pressure refrigerant vapor into high-temperature high-pressure vapor, the high-temperature high-pressure vapor is condensed into high-pressure liquid in the first condenser 2, the high-pressure refrigerant liquid coming out of the first condenser 2 sequentially flows into the throttling device 5 through the second condenser 3 and the liquid storage tank 4, the high-pressure refrigerant liquid enters the evaporator 6 after being throttled by the throttling device 5 to form a gas-liquid mixture, the gas-liquid mixture in the evaporator 6 absorbs heat of chilled water in the chilled water pipeline 10 to become low-pressure refrigerant gas, and the low-pressure refrigerant gas enters the compressor 1 to be compressed. The liquid heat pipe medium in the gravity heat pipe circulation pipeline absorbs heat released by high-temperature and high-pressure steam phase-change condensation in the first condenser 2 to gasify, the gasified gaseous heat pipe medium transfers phase-change condensation heat to the external environment by the combined action of the fan 9 and the cooling water pump 8 in the evaporative cooling tower 7, and the condensed liquid heat pipe medium flows back to the first condenser 2 from the evaporative cooling tower 7 under the action of gravity and gasifies again. In the mode, the vapor compression refrigeration cycle pipeline, the gravity heat pipe cycle pipeline and the cooling water cycle pipeline are operated in a combined mode, so that the low-temperature chilled water is prepared.
(3) Combined mode referring to FIG. 5, when the air temperature is high, the cooling water pump 8 and the fan 9 are turned on, the first valve a and the third valve c are turned on, the second valve b and the fourth valve d are turned off, and the compressor 1 and the throttle device 5 are operated. The compressor 1 in the vapor compression refrigeration cycle pipeline compresses low-temperature low-pressure refrigerant vapor into high-temperature high-pressure vapor, part of the high-temperature high-pressure vapor is condensed into high-pressure liquid in the first condenser 2, the refrigerant gas-liquid mixture coming out of the first condenser 2 flows into the second condenser 3 to be condensed into high-pressure liquid, the high-pressure refrigerant liquid coming out of the second condenser 3 flows into the throttling device 5 through the liquid storage tank 4, the throttling device 5 throttles the high-pressure refrigerant liquid to enter the evaporator 6 to form a gas-liquid mixture, the gas-liquid mixture in the evaporator 6 absorbs heat of chilled water in the chilled water pipeline 10 to be changed into low-pressure refrigerant gas, and the low-pressure refrigerant gas enters the compressor 1 to be compressed. The liquid heat pipe medium in the gravity heat pipe circulation pipeline absorbs heat released by high-temperature and high-pressure steam phase-change condensation in the first condenser 2 to gasify, the gasified gaseous heat pipe medium transfers phase-change condensation heat to the external environment by the combined action of the fan 9 and the cooling water pump 8 in the evaporative cooling tower 7, and the condensed liquid heat pipe medium flows back to the first condenser 2 from the evaporative cooling tower 7 under the action of gravity and gasifies again. The cooling water in the cooling water circulation pipeline absorbs heat released by the phase-change condensation of the high-temperature and high-pressure steam in the second condenser 3, the cooling water with heat absorption and temperature rise transfers the heat to the external environment in the evaporation type cooling tower 7 by the combined action of the fan 9 and the cooling water pump 8, and the cooled cooling water is conveyed to the second condenser 3 from the evaporation type cooling tower 7 under the action of the cooling water pump 8. In the mode, the vapor compression refrigeration cycle pipeline, the gravity heat pipe cycle pipeline and the cooling water cycle pipeline are operated in a combined mode, so that the low-temperature chilled water is prepared.
(4) In the water cooling mode, referring to fig. 6, when the air temperature is high, the cooling water pump 8 and the fan 9 are turned on, the second valve b and the third valve c are turned on, the first valve a and the fourth valve d are turned off, and the compressor 1 and the throttling device 5 are operated. The compressor 1 in the vapor compression refrigeration cycle pipeline compresses low-temperature low-pressure refrigerant vapor into high-temperature high-pressure vapor, the high-temperature high-pressure vapor is directly condensed into high-pressure liquid in the second condenser 3 after passing through the second valve b, the high-pressure refrigerant liquid from the second condenser 3 sequentially flows into the throttling device 5 through the liquid storage tank 4, the high-pressure refrigerant liquid enters the evaporator 6 after being throttled by the throttling device 5 to form a gas-liquid mixture, the gas-liquid mixture in the evaporator 6 absorbs the heat of chilled water in the chilled water pipeline 10 to become low-pressure refrigerant gas, and the low-pressure refrigerant gas enters the compressor 1 to be compressed. The cooling water in the cooling water circulation pipeline absorbs heat released by the phase-change condensation of the high-temperature and high-pressure steam in the second condenser 3, the cooling water with heat absorption and temperature rise transfers the heat to the external environment in the evaporation type cooling tower 7 by the combined action of the fan 9 and the cooling water pump 8, and the cooled cooling water is conveyed to the second condenser 3 from the evaporation type cooling tower 7 under the action of the cooling water pump 8. In the mode, the vapor compression refrigeration cycle pipeline and the cooling water cycle pipeline are operated in a combined mode, so that the low-temperature chilled water is prepared.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
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