CN111442445A - Double-cold-source water chilling unit refrigerating system based on indirect evaporative cooling technology - Google Patents
Double-cold-source water chilling unit refrigerating system based on indirect evaporative cooling technology Download PDFInfo
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- CN111442445A CN111442445A CN202010379788.7A CN202010379788A CN111442445A CN 111442445 A CN111442445 A CN 111442445A CN 202010379788 A CN202010379788 A CN 202010379788A CN 111442445 A CN111442445 A CN 111442445A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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Abstract
The invention belongs to the technical field of refrigeration equipment, and particularly relates to a double-cold-source water chilling unit refrigeration system based on an indirect evaporative cooling technology, which comprises a main machine section and a cooling section, wherein the main machine section is positioned in a main machine box body, and the cooling section is positioned in a cooling box body; the host section includes: a compression refrigeration loop, a natural cooling loop and a circulating water loop; the cooling section includes: the invention discloses a spray water loop and an indirect evaporation composite cooling loop, which are different from a natural cooling system of a traditional air conditioning equipment system, the switching basis adopts the environment sub-dew point temperature as the switching basis, the annual service life of a natural cold source is greatly prolonged, the COP of the natural cooling system is 2-3 times that of the COP of the traditional air cooling natural cooling system, and the energy-saving advantage of the system in the comprehensive operation is obvious.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a double-cold-source water chilling unit refrigeration system based on an indirect evaporative cooling technology.
Background
With the rapid development of air conditioning technology, indirect evaporative cooling technology is widely applied in various industries, and has the greatest characteristic that dry air can be used as main driving force for refrigeration in the refrigeration process, and high-temperature cold water can be obtained without compression refrigeration during operation, so that the air conditioning technology has the characteristics of environmental protection, energy conservation, health and the like.
However, the indirect evaporation refrigeration technology is mainly applied to northern regions, so how to popularize and apply the technology in China, especially in industries requiring year-round refrigeration such as metallurgy industry, power plants, biopharmaceutical industry, data center and the like, is a subject to be researched in the whole air conditioning industry.
With the continuous progress of the technology, some manufacturers propose that an indirect evaporation water chilling unit and a traditional compressor unit are implemented on some projects by adopting a parallel or serial system forming mode, and a certain energy-saving effect is achieved.
In addition, the mode control by utilizing a natural cold source is relatively troublesome, the energy-saving effect of the system operation is limited, and the problem of operation in winter and freeze prevention are difficult to solve.
Disclosure of Invention
The invention aims to provide a double-cold-source water chilling unit refrigeration system based on an indirect evaporative cooling technology, and aims to solve the problems that with continuous progress of the technology in the background technology, the existing system adopting the indirect evaporative cooling unit and the traditional compressor unit in parallel or series is relatively complex in composition mode, cannot achieve an integrated idea, is relatively large in occupied area, is relatively difficult to maintain due to the fact that the indirect evaporative cooling technology adopts an open system, is relatively troublesome in mode control by utilizing a natural cold source, is limited in energy-saving effect of system operation, and is difficult to solve in winter operation and anti-freezing.
In order to achieve the purpose, the invention provides the following technical scheme: a double-cold-source water chilling unit refrigerating system based on indirect evaporative cooling technology comprises a main machine section and a cooling section, wherein the main machine section is located in a main machine box body, and the cooling section is located in a cooling box body;
the host section includes: a compression refrigeration loop, a natural cooling loop and a circulating water loop;
the cooling section includes: a spray water loop, an indirect evaporative composite cooling loop;
the compression refrigeration circuit comprises a compressor, wherein an inlet of the compressor is connected to a refrigerant gas outlet of the evaporator, a gas outlet of the compressor is connected to a gas inlet of the evaporative condenser, a liquid discharge outlet of the evaporative condenser is connected to a throttling mechanism, and an outlet of the throttling mechanism is connected to a refrigerant circuit inlet of the evaporator;
the natural cooling loop comprises a cooling circulating water pump, a suction port of the cooling circulating water pump is connected to a cooling water loop outlet of the intermediate heat exchanger, a water outlet of the cooling circulating water pump is connected to an indirect evaporation composite cooling loop inlet of the cooling section, and a cooling water outlet of the indirect evaporation composite cooling loop of the cooling section is connected to a cooling water loop inlet of the intermediate heat exchanger;
the circulating water loop comprises an evaporator, a chilled water inlet of the evaporator is connected to a water supply pipeline of the air conditioning system, a chilled water outlet of the evaporator is connected to a water outlet a of a three-way valve, water inlets a and b of the three-way valve are divided into two branches, a water inlet a of one branch is connected to a water return pipeline of the air conditioning system, a water inlet b of the other branch is connected to a chilled water inlet of an intermediate heat exchanger, and a chilled water outlet of the intermediate heat exchanger is connected to a water return pipeline of the air conditioning system;
the spray water loop comprises a spray water pump, a suction port of the spray water pump is connected to a water outlet of the circulating water tank, a water outlet of the spray water pump is connected to a spray water distribution device, the spray water distribution device is positioned above the evaporative condenser and the natural cooler, and the evaporative condenser and the natural cooler are positioned above the circulating water tank;
the indirect evaporation composite cooling loop comprises an indirect evaporator, a water inlet of the indirect evaporator is connected to an outlet of a cooling circulating water pump of the natural cooling loop, a water outlet of the indirect evaporator is connected to an inlet of the natural cooler, and a cooling water outlet of the natural cooler is connected to an inlet of a cooling water loop of an intermediate heat exchanger of the natural cooling loop.
Preferably, the middle upper portion of cooling box is equipped with the exhaust fan, the lower part of exhaust fan is the static pressure equipment of airing exhaust, the side all is equipped with the cooling combination section about the static pressure equipment of airing exhaust, the left and right sides the cooling combination section all includes from last to down: spray water distribution device, evaporative condenser, natural cooler, the cooling combination section all includes from a left side to the right side: water retaining core, evaporative condenser and natural cooler, water retaining device, indirect evaporator.
Preferably, the number and the upper and lower relation of the evaporative condensers and the natural coolers positioned between the spray water distribution device and the circulating water tank in the cooling combined section can be adjusted.
Preferably, the evaporative condenser comprises a tube type evaporative condenser, a plate-tube evaporative condenser and a combination form of the above modes.
Preferably, the free cooler comprises a coil type and fin tube type heat exchanger.
Preferably, the indirect evaporator comprises a tube type, a surface cooling type, a seesaw type and a combination of the above modes.
Preferably, when the indirect evaporator adopts surface cooling, the water path connection mode adopts countercurrent or concurrent flow.
Preferably, the area of part of the evaporative condenser and the area of the natural cooler are replaced by the filler in the middle part of the spray water distribution device and the circulating water tank in the cooling combined section.
Preferably, the compression refrigeration loop and the natural cooling loop in the main machine section are both separated from the cooling section through an intermediate partition plate.
Compared with the prior art, the invention has the beneficial effects that:
1) the natural cooling system is different from the natural cooling system of the traditional air-conditioning equipment system, the switching basis adopts the environment sub-dew point temperature as the switching basis, the annual service life of a natural cold source is greatly prolonged, meanwhile, the COP of the natural cooling system is 2-3 times that of the COP of the traditional air-cooled natural cooling system, and the energy-saving advantage of the comprehensive operation of the system is obvious;
2) the invention adopts the concept of integrated design to perfectly combine the compression refrigeration system with the indirect evaporation composite natural cooling system, the system can flexibly select the refrigeration mode according to the requirement, and combines the characteristics of the evaporative condensation and indirect evaporation water chilling unit, the energy efficiency of the compression refrigeration system is maximally improved while the free refrigeration characteristic of the natural cold source is fully utilized, and the invention has the characteristics of lower operation energy consumption, water saving, high natural cold energy efficiency, high utilization rate, high system integration level and the like. In addition, due to the unique arrangement form of the spray section, the arrangement of the water cooling unit is more compact, and the occupied area of a system and equipment is less;
3) the invention is unique in cooling section structure and design concept of double cooling (heat exchange) of a natural cooler and an evaporative condenser and indirect evaporation auxiliary heat exchange, greatly improves the heat exchange performance of respective heat exchangers, reduces the cost of heat exchange materials, improves the system energy efficiency of compression refrigeration and natural cooling, is unique in cooling section structure and process design, solves the problem that a traditional cooling tower and an indirect evaporation water chilling unit are frozen in winter, solves the problems that the open system of the traditional indirect evaporation water chilling unit is poor in water quality and not easy to maintain and manage, and adopts the concept of integrated design to perfectly combine a compression refrigeration system and an indirect evaporation composite natural cooling system to realize the purpose of integrating two technologies on one device.
Drawings
Fig. 1 is a front view and a system schematic diagram of a dual cold source refrigeration unit based on indirect evaporative cooling technology according to a first embodiment of the present invention.
Fig. 2 is a top view of a double-cold-source water chilling unit based on an indirect evaporative cooling technology according to a first embodiment of the present invention.
Fig. 3 is a right side view of a cooling section of a double-cold-source water chilling unit based on an indirect evaporative cooling technology according to a first embodiment of the invention.
Fig. 4 is a front view and a system schematic diagram of a dual-cold-source water chilling unit based on an indirect evaporative cooling technology according to a second embodiment of the present invention.
Fig. 5 is a front view and a system schematic diagram of a dual-cold-source water chilling unit based on an indirect evaporative cooling technology according to a third embodiment of the present invention.
In the figure: the system comprises a compressor 1, an evaporative condenser 2, a throttling mechanism 3, an evaporator 4, a spray water pump 5, a circulating water tank 6, a spray water distribution device 7, a cooling box 8, an exhaust fan 9, an exhaust static pressure device 10, a cooling circulating water pump 11, a natural cooler 12, an intermediate heat exchanger 13, a three-way valve 14, an air conditioning system water return pipeline 15, an air conditioning system water supply pipeline 16, a cooling combination section 17, an intermediate partition plate 18, an indirect evaporator 19, a main machine box 20, a water retaining machine core 21 and a water retaining machine 22.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, 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 particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: as shown in fig. 1, 2 and 3, the first embodiment of the present invention includes: a main machine section located in the main machine box 20 and a cooling section located in the cooling box 8. The host section includes: a compression refrigeration loop, a natural cooling loop and a circulating water loop; this cooling section includes: a spray water loop and an indirect evaporation composite cooling loop.
The compression refrigeration circuit comprises a compressor 1, wherein an inlet of the compressor 1 is connected to a refrigerant outlet of an evaporator 4, an exhaust port of the compressor 1 is connected to an air inlet of an evaporative condenser 2, a liquid discharge outlet of the evaporative condenser 2 is connected to a throttling mechanism 3, and an outlet of the throttling mechanism 3 is connected to a refrigerant circuit inlet of the evaporator 4.
The natural cooling loop comprises a cooling circulation water pump 11, a suction port of the cooling circulation water pump 11 is connected to a cooling water (primary side) loop outlet of an intermediate heat exchanger 13, a water outlet of the cooling circulation water pump 11 is connected to an indirect evaporation composite cooling loop inlet of a cooling section, and the indirect evaporation composite cooling loop cooling water outlet of the cooling section is connected to the cooling water (primary side) loop inlet of the intermediate heat exchanger 13.
The circulating water loop comprises an evaporator 4, a chilled water inlet of the evaporator 4 is connected to a water supply pipeline 16 of the air conditioning system, a chilled water outlet of the evaporator 4 is connected to a water outlet of a three-way valve 14, water inlets a and b of the three-way valve 14 are divided into 2 branches, one branch water inlet a is connected to a return water pipeline 15 of the air conditioning system, the other branch water inlet b is connected to a chilled water inlet of an intermediate heat exchanger 13, and a chilled water outlet of the intermediate heat exchanger 13 is connected to the return water pipeline 15 of the air conditioning system.
The three-way valve water paths are a-c when the unit is in a compression refrigeration mode, and b-c when the unit is in a combined refrigeration mode or a complete natural refrigeration mode.
The spray water loop comprises a spray water pump 5, a suction port of the spray water pump 5 is connected to a water outlet of the circulating water tank 6, a water outlet of the spray water pump 5 is connected to a spray water distribution device 7, the spray water distribution device 7 is positioned above the evaporative condenser 2 and the natural cooler 12, and the evaporative condenser 2 and the natural cooler 12 are positioned above the circulating water tank 6.
The indirect evaporation composite cooling loop comprises an indirect evaporator 19, wherein the water inlet of the indirect evaporator 19 is connected to the outlet of a cooling circulating water pump 11 of the natural cooling loop, the water outlet of the indirect evaporator 19 is connected to the inlet of a natural cooler 12, and the cooling water outlet of the natural cooler 12 is connected to the cooling water (primary side) loop inlet of an intermediate heat exchanger 13 of the natural cooling loop.
Further, the upper portion in the middle of cooling box 8 is equipped with exhaust fan 9, and the lower part of this exhaust fan 9 is air exhaust static pressure device 10, and the left and right sides of this air exhaust static pressure device 10 all is equipped with cooling combination section 17, and this cooling combination section 17 all includes from last to bottom: the spraying water distribution device 7, the evaporative condenser 2, and the natural cooler 12, the cooling combination section 17 includes, from left to right: a water blocking machine core 21, the evaporative condenser 2, the natural cooler 12, a water blocking device 22 and the indirect evaporator 19.
When the air conditioner runs, outdoor air is fed by the indirect evaporator 19 under the action of the exhaust fan 9, and heat generated by the cooling combination section 17 is exhausted out of the cooling section through the water eliminator 22, the evaporative condenser 2, the natural cooler 12, the water eliminator core 21 and the exhaust static pressure device 10.
Furthermore, the evaporative condensers 2 and the natural coolers 12 in the cooling combined section 17, which are positioned between the spray water distribution device 7 and the circulating water tank 6, can be adjusted in number and in upper and lower relation according to the system arrangement requirements.
Further, the evaporative condenser 2 includes tube type, plate-tube type evaporative condensers and combinations thereof.
Further, the free cooler 12 includes a coil type, fin tube type heat exchanger.
Further, the indirect evaporator 19 includes a tube type, a surface cooling type, a seesaw type and a combination thereof.
Furthermore, if the indirect evaporator 19 is surface-cooled, the water path connection mode can be reverse flow or forward flow as required.
Furthermore, the middle parts of the spraying water distribution device 7 and the circulating water tank 6 in the cooling combined section 17 can improve the heat exchange effect, and can increase the filler to improve the heat exchange performance or replace part of the areas of the evaporative condenser 2 and the natural cooler 12 with the filler, thereby reducing the cost of the heat exchanger.
Further, the compression refrigeration circuit and the natural cooling circuit in the main machine section are separated from the cooling section through an intermediate partition plate 18.
The double-cold-source water chilling unit based on the indirect evaporative cooling technology has different operation modes, and the specific implementation mode is as follows:
1) and a compression refrigeration mode: under this mode, circulating water system's refrigerated water gets into the unit by air conditioning system return water pipeline 15, and later the refrigerated water gets into by the a of three-way valve 14, goes out again by the c mouth and gets into evaporimeter 4 cooling, and by the refrigerated water of cooling, reentrant air conditioning system supply channel 16 provides the cold source for air conditioning system end equipment, and the refrigerated water absorbs indoor heat and then gets into the host computer section through air conditioning system return water pipeline 15 once more, so recirculation. The refrigerant side of the evaporator 4 works by adopting a compression refrigeration system, the refrigerant in the evaporator 4 absorbs the heat of the frozen water in the circulating water system and is vaporized into low-temperature and low-pressure steam, the compressor 1 absorbs the refrigerant steam, and the refrigerant steam is converted into high-temperature and high-pressure steam after compression. The high-temperature and high-pressure refrigerant vapor enters the evaporative condenser 2. The spray water pump 5 sucks water in the circulating water tank 6 into the spray water distribution device 7, and the spray water distribution device 7 sprays spray water. The refrigerant steam entering the evaporative condenser 2 releases heat, and the spray water sprayed by the spray water distribution device 7 takes away the heat, so that the refrigerant steam is condensed into high-pressure low-temperature liquid. The high-pressure low-temperature refrigerant liquid after condensation becomes low-pressure low-temperature liquid after being throttled by the throttling mechanism 3, the low-temperature low-pressure refrigerant liquid enters the evaporator 4 to be vaporized by heat absorption again, and the cooling process of the chilled water in the evaporator 4 is realized by the circulation. In addition, the spray water sprayed by the spray water distribution device 7 in the circulation process passes through the evaporative condenser 2 and then is cooled by the natural cooler 12, and then flows through the lower evaporative condenser 2 and the natural cooler 12 and falls into the circulation water tank 6 for recycling. The free cooler 12 may exchange heat between the shower water and the air, which carries the waste heat, so that the waste heat is transferred to the air and dissipated into the atmosphere. In addition, at this time, the natural cooling circuit and the indirect evaporation composite cooling circuit are also in working states, outdoor intake air passes through the indirect evaporator 19, the air state is changed under the action of the indirect evaporator 19, the condensation temperature of the evaporative condenser 2 is further reduced, and the indirect evaporator 19 absorbs heat and then releases the heat to exhaust air through the natural cooler 12. The compression refrigeration system has the advantages that the compression refrigeration system is more direct in refrigeration due to heat exchange, and simultaneously changes the state of entering air under the action of indirect evaporation cooling, so the condensation temperature is lower, and the compression refrigeration energy efficiency is higher.
2) And a combined refrigeration mode: under this mode, circulating water system's refrigerated water gets into the unit by air conditioning system return water pipeline 15, and later the refrigerated water carries out the precooling through middle heat exchanger 13 earlier, later get into three-way valve 14 by the b mouth, go out by the c mouth and get into evaporimeter 4 and lower the temperature once more, by the refrigerated water of cooling, reentrant air conditioning system supply channel 16, for air conditioning system end equipment provides the cold source, the refrigerated water absorbs indoor heat and then gets into the host computer section through air conditioning system return water pipeline 15 once more, so the circulation repeatedly. The refrigerant side of the evaporator 4 works by adopting a compression refrigeration system, the refrigerant in the evaporator 4 absorbs the heat of the frozen water in the circulating water system and is vaporized into low-temperature and low-pressure steam, the compressor 1 absorbs the refrigerant steam, and the refrigerant steam is converted into high-temperature and high-pressure steam after compression. The high-temperature and high-pressure refrigerant vapor enters the evaporative condenser 2. The spray water pump 5 sucks water in the circulating water tank 6 into the spray water distribution device 7, and the spray water distribution device 7 sprays spray water. The refrigerant steam entering the evaporative condenser 2 releases heat, and the spray water sprayed by the spray water distribution device 7 takes away the heat, so that the refrigerant steam is condensed into high-pressure low-temperature liquid. The high-pressure low-temperature refrigerant liquid after condensation becomes low-pressure low-temperature liquid after being throttled by the throttling mechanism 3, the low-temperature low-pressure refrigerant liquid enters the evaporator 4 to be vaporized by heat absorption again, and the cooling process of the chilled water in the evaporator 4 is realized by the circulation. In addition, the spray water sprayed by the spray water distribution device 7 in the circulation process passes through the evaporative condenser 2 and then is cooled by the natural cooler 12, and then flows through the lower evaporative condenser 2 and the natural cooler 12 and falls into the circulation water tank 6 for recycling. The free cooler 12 may exchange heat between the shower water and the air, which carries the waste heat, so that the waste heat is transferred to the air and dissipated into the atmosphere. In addition, at this time, the natural cooling circuit and the indirect evaporation composite cooling circuit are also in working states, outdoor intake air passes through the indirect evaporator 19, the air state is changed under the action of the indirect evaporator 19, the condensation temperature of the evaporative condenser 2 is further reduced, and the indirect evaporator 19 absorbs heat and then releases the heat to exhaust air through the natural cooler 12. Because a large amount of heat is absorbed by the natural cooling loop system in the mode, and the intervention time of the unit in the mode is advanced under the action of the indirect evaporator 19, the power consumption of the unit in the mode is greatly reduced, and the annual operation energy consumption is also greatly reduced.
3) Complete natural cooling mode: under this mode, circulating water system's refrigerated water gets into the unit by air conditioning system return water pipeline 15, and later the refrigerated water cools down through intermediate heat exchanger 13 earlier, later in proper order through three-way valve 14 b, c mouth, evaporimeter 4, by the cooling water of cooling, through air conditioning system supply channel 16, for air conditioning system end equipment provides the cold source, the refrigerated water absorbs indoor heat after and enters into the host computer section through air conditioning system return water pipeline 15 once more, so the circulation repeatedly. At this time, the compression refrigeration system stops working, and the natural cooling circuit and the indirect evaporation composite cooling circuit are in working states. The cooling water in the intermediate heat exchanger 13 absorbs the heat in the chilled water, and is absorbed by the cooling circulating water pump 11, and the cooling water enters the indirect evaporator 19 with the help of the cooling circulating water pump 11 for precooling, and then passes through the natural cooler 12. The spray water pump 5 sucks water in the circulating water tank 6 into the spray water distribution device 7, and the spray water distribution device 7 sprays spray water. The cooling water entering the natural cooler 12 releases heat, and the spray water sprayed by the spray water distribution device 7 takes away the heat to cool the cooling water. After the temperature is reduced, cooling water enters the two-loop intermediate heat exchanger 13 to absorb heat in the other loop of refrigeration circulating water system, and the circulation is carried out. The cooling process of the chilled water in the intermediate heat exchanger 13 is realized. In addition, the spray water sprayed by the spray water distribution device 7 in the circulation process is cooled by the evaporative condenser 2, then passes through the natural cooler 12, flows through the lower evaporative condenser 2 and the natural cooler 12, and falls into the circulation water tank 6 for recycling. The evaporative condenser 2 can exchange heat between the spray water carrying the waste heat and the air, so that the waste heat is transferred to the air and is dispersed into the atmosphere. Because the whole heat is born by the natural cooling loop system in the mode, the power consumption of the whole system is lower, and the energy efficiency of the unit is higher.
It is worth noting that when the air-cooled air conditioner runs in winter, the outdoor fresh air can be heated by the indirect evaporator 19, and the air in the spraying section is always kept above zero, so that the risk of freezing of.
In addition, in the working process of the three working modes, the exhaust fan 9 can accelerate the air flow, and can quickly and respectively take away the heat of the refrigerant, the cooling water and the spraying water through the air, so that the heat dissipation efficiency is improved.
Fig. 4 is a schematic diagram of a second embodiment of a dual-cold-source water chilling unit based on an indirect evaporative cooling technology. In the second embodiment, the intermediate heat exchanger 13 and the cooling circulation water pump 11 are eliminated. A cooling water loop is formed among the three-way valve 14, the air conditioning system water return pipeline 15 and the natural cooler 12. Specifically, the difference between the second embodiment and the first embodiment is that: the water outlet of the aforementioned air conditioning system water return pipeline 15 is connected to an indirect evaporator 19, the indirect evaporator 19 is connected to a natural cooler 12, and the natural cooler 12 is connected to a three-way valve 14.
Because the heat exchange link between the natural cooling loop and the circulating water loop is reduced, the system heat exchange is more direct, and the annual running time and the energy efficiency of the combined refrigeration mode and the complete natural cooling mode are greatly improved.
FIG. 5 is a schematic diagram of a third embodiment of the present invention. The difference between the third embodiment and the first embodiment is that: the sequence of the cooling circulation water pump 11 connecting the natural cooler 12 and the indirect evaporator 19 is different, specifically: in the third embodiment, the cooling circulation water pump 11 is directly connected with the natural cooler 12, the natural cooler 12 is connected with the indirect evaporator 19, and the indirect evaporator 19 is connected with the intermediate heat exchanger 13 to form an indirect evaporation composite cooling loop.
While there have been shown and described the fundamental principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a two cold source cooling water set refrigerating system based on indirect evaporation cooling technique, includes the main engine section that is located main engine box (20) and is located the cooling zone of cooling box (8), its characterized in that:
the host section includes: a compression refrigeration loop, a natural cooling loop and a circulating water loop;
the cooling section includes: a spray water loop, an indirect evaporative composite cooling loop;
the compression refrigeration circuit comprises a compressor (1), wherein an inlet of the compressor (1) is connected to a refrigerant gas outlet of an evaporator (4), a gas outlet of the compressor (1) is connected to a gas inlet of an evaporative condenser (2), a liquid discharge outlet of the evaporative condenser (2) is connected to a throttling mechanism (3), and an outlet of the throttling mechanism (3) is connected to a refrigerant circuit inlet of the evaporator (4);
the natural cooling loop comprises a cooling circulating water pump (11), a suction port of the cooling circulating water pump (11) is connected to a cooling water loop outlet of the intermediate heat exchanger (13), a water outlet of the cooling circulating water pump (11) is connected to an indirect evaporation composite cooling loop inlet of the cooling section, and the indirect evaporation composite cooling loop cooling water outlet of the cooling section is connected to a cooling water loop inlet of the intermediate heat exchanger (13);
the circulating water loop comprises an evaporator (4), a chilled water inlet of the evaporator (4) is connected to a water supply pipeline (16) of the air conditioning system, a chilled water outlet of the evaporator (4) is connected to a water outlet a of a three-way valve (14), water inlets a and b of the three-way valve (14) are divided into two branches, a water inlet a of one branch is connected to a water return pipeline (15) of the air conditioning system, a water inlet b of the other branch is connected to a chilled water inlet of an intermediate heat exchanger (13), and a chilled water outlet of the intermediate heat exchanger (13) is connected to the water return pipeline (15) of the air conditioning system;
the spray water loop comprises a spray water pump (5), a suction port of the spray water pump (5) is connected to a water outlet of the circulating water tank (6), a water outlet of the spray water pump (5) is connected to a spray water distribution device (7), the spray water distribution device (7) is positioned above the evaporative condenser (2) and the natural cooler (12), and the evaporative condenser (2) and the natural cooler (12) are positioned above the circulating water tank (6);
the indirect evaporation composite cooling loop comprises an indirect evaporator (19), a water inlet of the indirect evaporator (19) is connected to an outlet of a cooling circulating water pump (11) of the natural cooling loop, a water outlet of the indirect evaporator (19) is connected to an inlet of a natural cooler (12), and a cooling water outlet of the natural cooler (12) is connected to a cooling water loop inlet of an intermediate heat exchanger (13) of the natural cooling loop.
2. The double-cold-source water chilling unit based on the indirect evaporative cooling technology is characterized in that: the middle upper portion of cooling box (8) is equipped with exhaust fan (9), the lower part of exhaust fan (9) is air exhaust static pressure device (10), the left and right sides of air exhaust static pressure device (10) all is equipped with cooling combination section (17), the left and right sides cooling combination section (17) all include from last to down: spray water distribution device (7), evaporative condenser (2), natural cooler (12), cooling combination section (17) all include from a left side to the right side: a water retaining machine core (21), an evaporative condenser (2), a natural cooler (12), a water retaining device (22) and an indirect evaporator (19).
3. The double-cold-source water chilling unit based on the indirect evaporative cooling technology is characterized in that: the number and the upper and lower relations of the evaporative condenser (2) and the natural cooler (12) which are positioned between the spray water distribution device (7) and the circulating water tank (6) in the cooling combined section (17) can be adjusted.
4. The double-cold-source water chilling unit based on the indirect evaporative cooling technology is characterized in that: the evaporative condenser (2) comprises a tube type evaporative condenser, a plate-tube evaporative condenser and a combination form of the above modes.
5. The double-cold-source water chilling unit based on the indirect evaporative cooling technology is characterized in that: the natural cooler (12) comprises a coil tube type and fin tube type heat exchanger.
6. The double-cold-source water chilling unit based on the indirect evaporative cooling technology is characterized in that: the indirect evaporator (19) comprises a tube type, a surface cooling type, a warping plate type and a combination of the above modes.
7. The double-cold-source water chilling unit based on the indirect evaporative cooling technology is characterized in that: when the indirect evaporator (19) adopts surface cooling type, the water path connecting pipe mode adopts countercurrent flow or concurrent flow.
8. The double-cold-source water chilling unit based on the indirect evaporative cooling technology is characterized in that: and the cooling combined section (17) is positioned in the middle parts of the spraying water distribution device (7) and the circulating water tank (6) and uses fillers to replace the areas of part of the evaporative condenser (2) and the natural cooler (12).
9. The double-cold-source water chilling unit based on the indirect evaporative cooling technology is characterized in that: the compression refrigeration loop and the natural cooling loop in the main machine section are both separated from the cooling section through an intermediate partition plate (18).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010379788.7A CN111442445A (en) | 2020-05-08 | 2020-05-08 | Double-cold-source water chilling unit refrigerating system based on indirect evaporative cooling technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010379788.7A CN111442445A (en) | 2020-05-08 | 2020-05-08 | Double-cold-source water chilling unit refrigerating system based on indirect evaporative cooling technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460863A (en) * | 2020-12-10 | 2021-03-09 | 珠海格力电器股份有限公司 | Water chilling unit and refrigeration control method and device thereof |
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2020
- 2020-05-08 CN CN202010379788.7A patent/CN111442445A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460863A (en) * | 2020-12-10 | 2021-03-09 | 珠海格力电器股份有限公司 | Water chilling unit and refrigeration control method and device thereof |
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