CN111442445A - Double-cold-source water chilling unit refrigerating system based on indirect evaporative cooling technology - Google Patents

Abstract

The invention disclosed in the invention belongs to the technical field of refrigeration equipment, in particular to a refrigeration system for a dual-cold-source chiller unit based on indirect evaporative cooling technology, comprising a main engine section located in a main engine box and a cooling section located in the cooling box; the main engine section includes : compression refrigeration circuit, natural cooling circuit, circulating water circuit; the cooling section includes: spray water circuit, indirect evaporative composite cooling circuit, the present invention is different from the natural cooling system of traditional air-conditioning equipment systems, and its switching is based on the use of environmental sub-systems. The dew point temperature is used as the basis for switching, which greatly improves the annual use time of the natural cooling source. At the same time, the COP of the natural cooling system is 2 to 3 times that of the traditional air-cooled natural cooling system, and the overall operation of the system has obvious energy-saving advantages.

Description

A Refrigeration System of Double Cold Source Chillers Based on Indirect Evaporative Cooling Technology

technical field

The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration system for a dual-cold-source chiller unit based on an indirect evaporative cooling technology.

Background technique

With the rapid development of air-conditioning technology, indirect evaporative cooling technology has been widely used in all walks of life. Its biggest feature is that it uses dry air energy as the main driving force for refrigeration in the refrigeration process. High temperature cold water, so it has the characteristics of green environmental protection, energy saving, health and so on.

As for the current application of indirect evaporative refrigeration technology, it is mainly used in northern regions, so how can this technology be popularized and applied across the country, especially in metallurgy, power plants, biopharmaceuticals, data centers, etc. The promotion and application of industries that require year-round refrigeration is a subject that the entire air-conditioning industry needs to study.

With the continuous advancement of technology, some manufacturers have proposed the use of indirect evaporative chillers and traditional compressors in parallel or series system. They have been implemented in some projects, and achieved certain energy-saving effects. It is complicated and cannot be integrated, and the floor area is relatively large. At the same time, because the indirect evaporative cooling technology adopts an open system, the system maintenance is relatively difficult.

In addition, the mode control using natural cooling source is relatively troublesome, the energy-saving effect of system operation is limited, and it is difficult to solve the problem of freezing prevention in winter operation.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a dual-source chiller refrigeration system based on indirect evaporative cooling technology, in order to solve the problem that with the continuous advancement of technology proposed in the above-mentioned background technology, the existing indirect evaporative chillers and traditional compressors are connected in parallel Or the system composition in series is relatively complicated, the idea of integration cannot be achieved, and the floor area is relatively large. At the same time, because the indirect evaporative cooling technology adopts an open system, it is relatively difficult to maintain the system. It is relatively troublesome, the energy-saving effect of system operation is limited, and the problem of antifreeze operation in winter is difficult to solve.

In order to achieve the above purpose, the present invention provides the following technical solutions: a dual-cold-source chiller refrigeration system based on indirect evaporative cooling technology, comprising a main engine section located in the main engine box and a cooling section located in the cooling box;

The main engine section includes: a compression refrigeration circuit, a natural cooling circuit, and a circulating water circuit;

The cooling section includes: a spray water circuit, an indirect evaporative composite cooling circuit;

The compression refrigeration circuit includes a compressor, the inlet of the compressor is connected to the refrigerant air outlet of the evaporator, the discharge port of the compressor is connected to the air inlet of the evaporative condenser, and the discharge port of the evaporative condenser is connected. The liquid outlet is connected to the throttling mechanism, and the outlet of the throttling mechanism is connected to the refrigerant circuit inlet of the evaporator;

The natural cooling circuit includes a cooling circulating water pump, the suction port of the cooling circulating water pump is connected to the cooling water circuit outlet of the intermediate heat exchanger, and the water outlet of the cooling circulating water pump is connected to the indirect evaporative composite cooling circuit inlet of the cooling section, so The cooling water outlet of the indirect evaporative composite cooling circuit of the cooling section is connected to the cooling water circuit inlet of the intermediate heat exchanger;

The circulating water circuit includes an evaporator, the chilled water inlet of the evaporator is connected to the water supply pipeline of the air-conditioning system, the chilled water outlet of the evaporator is connected to the water outlet a of the three-way valve, and the inlet of the three-way valve is connected. The water inlets a and b are divided into two branches. One branch water inlet a is connected to the return water pipeline of the air conditioning system, and the other branch water inlet b is connected to the chilled water inlet of the intermediate heat exchanger. The chilled water outlet is connected to the return water pipeline of the air conditioning system;

The spray water circuit includes a spray water pump, the suction port of the spray water pump is connected to the water outlet of the circulating water tank, and the water outlet of the spray water pump is connected to the spray water distribution device, and the spray water distribution device is located in the evaporator. Above the condenser and the free cooler, the evaporative condenser and the free cooler are located above the circulating water tank;

The indirect evaporative composite cooling circuit includes an indirect evaporator, the water inlet of the indirect evaporator is connected to the outlet of the cooling circulating water pump of the natural cooling circuit, and the water outlet of the indirect evaporator is connected to the natural cooler inlet and the natural cooler. The cooling water outlet is connected to the cooling water circuit inlet of the intermediate heat exchanger of the free cooling circuit.

Preferably, an exhaust fan is arranged in the upper middle part of the cooling box, the lower part of the exhaust fan is an exhaust static pressure device, and the left and right sides of the exhaust static pressure device are provided with cooling combined sections, The cooling combined section includes from top to bottom: spray water distribution device, evaporative condenser, natural cooler, and from left to right the cooling combined section includes: water blocking core, evaporative condenser and natural cooler, Water blocker, indirect evaporator.

Preferably, the number of evaporative condensers and natural coolers located between the spray water distribution device and the circulating water tank in the cooling combined section and the relationship between the upper and lower parts can be adjusted.

Preferably, the evaporative condenser includes a tube type, a plate type, a plate and tube type evaporative condenser and a combination of the above.

Preferably, the natural cooler includes a coil-type and fin-and-tube heat exchanger.

Preferably, the indirect evaporator includes a tubular type, a surface cooling type, a rocker type and a combination of the above.

Preferably, when the indirect evaporator adopts the surface cooling type, the water pipe connection method adopts countercurrent or cocurrent.

Preferably, in the cooling combination section located in the middle of the spray water distribution device and the circulating water tank, a part of the area of the evaporative condenser and the natural cooler is replaced by packing.

Preferably, the compression refrigeration circuit and the natural cooling circuit in the main engine section are separated from the cooling section by an intermediate partition plate.

Compared with the prior art, the beneficial effects of the present invention are:

1) The present invention is different from the natural cooling system of the traditional air-conditioning equipment system, and its switching basis adopts the ambient sub-dew point temperature as the switching basis, which greatly improves the annual use time of the natural cooling source, and at the same time, the COP of the natural cooling system is the same as that of the traditional air cooling system. The COP of the cold natural cooling system is 2 to 3 times that of the system, and the overall operation of the system has obvious energy-saving advantages;

2) The invention adopts the concept of integrated design to perfectly combine the compression refrigeration system with the indirect evaporative composite natural cooling system. The system can flexibly select the refrigeration mode according to the needs, and combine the characteristics of the evaporative condensation and indirect evaporative chillers to make full use of the natural cooling system. At the same time, it maximizes the energy efficiency of the compression refrigeration system, and has the characteristics of lower operating energy consumption, water saving, high natural cooling energy efficiency, high utilization rate, and high system integration. In addition, due to the unique arrangement of the spray section, the arrangement of the chiller is also more compact, and the system and equipment occupy less space;

3) The unique cooling section structure and the design concept of dual cooling (heat exchange) of natural cooler and evaporative condenser and indirect evaporative auxiliary heat exchange of the present invention greatly improve the heat exchange performance of each heat exchanger and reduce heat exchange materials. cost, improve the energy efficiency of the respective systems of compression refrigeration and natural cooling, unique cooling section structure and process design, solve the problem of freezing in winter in traditional cooling towers and indirect evaporative chillers, and solve the traditional indirect evaporative chiller. The open system has poor water quality and is not easy to For maintenance and management issues, the concept of integrated design is adopted to perfectly combine the compression refrigeration system and the indirect evaporative composite natural cooling system to achieve the purpose of integrating the two technologies on one device.

Description of drawings

FIG. 1 is a front view and a system schematic diagram of a dual-cold-source refrigeration unit based on the indirect evaporative cooling technology according to the first embodiment of the present invention.

FIG. 2 is a top view of a dual-cold-source chiller based on the indirect evaporative cooling technology according to the first embodiment of the present invention.

FIG. 3 is a right side view of the cooling section of a dual-cold-source chiller based on the indirect evaporative cooling technology according to the first embodiment of the present invention.

4 is a front view and a system schematic diagram of a dual-cold-source chiller based on the indirect evaporative cooling technology according to the second embodiment of the present invention.

FIG. 5 is a front view and a system schematic diagram of a dual-cold-source chiller based on the indirect evaporative cooling technology according to the third embodiment of the present invention.

In the picture: 1 compressor, 2 evaporative condenser, 3 throttle mechanism, 4 evaporator, 5 spray water pump, 6 circulating water tank, 7 spray water distribution device, 8 cooling box, 9 exhaust fan, 10 exhaust static pressure device, 11 cooling circulating water pump, 12 natural cooler, 13 intermediate heat exchanger, 14 three-way valve, 15 air conditioning system return water pipeline, 16 air conditioning system water supply pipeline, 17 cooling combined section, 18 intermediate partition plate, 19 indirect Evaporator, 20 main engine box, 21 water block movement, 22 water block.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", " The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, so as to The specific orientation configuration and operation are therefore not to be construed as limitations of the present invention.

1-5, the present invention provides a technical solution: the present invention is a dual-cold source refrigeration unit based on indirect evaporative cooling technology, as shown in Figures 1, 2, and 3, the first embodiment includes: The inner main engine section and the cooling section located in the cooling box 8. The main engine section includes: a compression refrigeration circuit, a natural cooling circuit, and a circulating water circuit; the cooling section includes: a spray water circuit and an indirect evaporative composite cooling circuit.

The compression refrigeration circuit includes a compressor 1, the inlet of the compressor 1 is connected to the refrigerant outlet of the evaporator 4, the discharge outlet of the compressor 1 is connected to the intake inlet of the evaporative condenser 2, the evaporative condenser 2 The discharge outlet of the throttling mechanism 3 is connected to the throttling mechanism 3 , and the outlet of the throttling mechanism 3 is connected to the refrigerant circuit inlet of the evaporator 4 .

The natural cooling circuit includes a cooling circulating water pump 11, the suction port of the cooling circulating water pump 11 is connected to the cooling water (primary side) circuit outlet of the intermediate heat exchanger 13, and the water outlet of the cooling circulating water pump 11 is connected to the indirect evaporative compound of the cooling section The cooling loop inlet, the indirect evaporative 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 circuit includes an evaporator 4, the chilled water inlet of the aforementioned evaporator 4 is connected to the water supply pipeline 16 of the air conditioning system, and the chilled water outlet of the aforementioned evaporator 4 is connected to the water outlet a of the three-way valve 14, the three-way The water inlets a and b of the valve 14 are divided into two branches, one branch water inlet a is connected to the air conditioning system return water pipeline 15, and the other branch water inlet b is connected to the chilled water inlet of the intermediate heat exchanger 13. , the chilled water outlet of the intermediate heat exchanger 13 is connected to the return water pipeline 15 of the air conditioning system.

When the unit is in the compression cooling mode, the three-way valve water circuit is a-c, and when the unit is in the combined cooling mode or the complete natural cooling mode, the three-way valve water circuit is b-c.

The spray water circuit includes a spray water pump 5, the suction port of the spray water pump 5 is connected to the water outlet of the circulating water tank 6, the water outlet of the spray water pump 5 is connected to the spray water distribution device 7, and the spray water distribution device 7 Above the evaporative condenser 2 and the natural cooler 12 , the evaporative condenser 2 and the natural cooler 12 are above the circulating water tank 6 .

The indirect evaporative composite cooling circuit includes an indirect evaporator 19, the water inlet of the indirect evaporator 19 is connected to the outlet of the cooling circulating water pump 11 of the natural cooling circuit, the water outlet of the indirect evaporator 19 is connected to the inlet of the natural cooler 12, the The cooling water outlet of the free cooler 12 is connected to the cooling water (primary side) circuit inlet of the intermediate heat exchanger 13 of the free cooling circuit.

Further, an exhaust fan 9 is arranged in the upper middle part of the cooling box 8, and the lower part of the exhaust fan 9 is an exhaust static pressure device 10. The left and right sides of the exhaust static pressure device 10 are provided with cooling combined sections 17. The cooling combined section 17 includes from top to bottom: the aforementioned spray water distribution device 7, the aforementioned evaporative condenser 2, and the aforementioned natural cooler 12. From left to right, the cooling combined section 17 includes: the water blocking core 21, The aforementioned evaporative condenser 2, the aforementioned natural cooler 12, the aforementioned water blocker 22, and the aforementioned indirect evaporator 19.

When running, the outdoor air is fed by the indirect evaporator 19 under the action of the exhaust fan 9, and passes through the water blocker 22, the evaporative condenser 2, the natural cooler 12, the water block core 21, and the exhaust static pressure device 10 respectively. , the heat generated by the cooling combined section 17 is discharged out of the cooling section.

Further, the number of evaporative condensers 2 and natural coolers 12 located between the spray water distribution device 7 and the circulating water tank 6 in the cooling combined section 17 can be adjusted according to the needs of the system layout and the relationship between them.

Further, the evaporative condenser 2 includes a tubular type, a plate type, a plate-and-tube type evaporative condenser and a combination of the above methods.

Further, the natural cooler 12 includes coil type and fin-and-tube heat exchangers.

Further, the indirect evaporator 19 includes a tubular type, a surface cooling type, a rocker type and a combination type of the above.

Further, if the indirect evaporator 19 adopts the surface cooling type, the water pipe connection method can be counter-current or co-current as required.

Further, in the cooling combined section 17 located in the middle of the spray water distribution device 7 and the circulating water tank 6, in order to improve the heat exchange effect, packing can be added to improve the heat exchange performance or replace part of the evaporative condenser 2 and the natural cooler 12 with packing. area, reducing heat exchanger costs.

Further, the compression refrigeration circuit and the natural cooling circuit in the main engine section are separated from the cooling section by the intermediate partition plate 18 .

The dual cold source chiller based on indirect evaporative cooling technology has different operation modes, and the specific implementation methods are as follows:

1) Compression refrigeration mode: In this mode, the chilled water of the circulating water system enters the unit through the air-conditioning system return pipe 15, and then the chilled water enters through the a of the three-way valve 14, and then goes out through the c port and enters the evaporator 4 to cool down. The cooled chilled water enters the air-conditioning system water supply pipeline 16 to provide a cold source for the terminal equipment of the air-conditioning system. After absorbing indoor heat, the chilled water enters the main unit through the air-conditioning system return water pipeline 15 again, and the cycle is repeated. The refrigerant side of the evaporator 4 uses a compression refrigeration system to work. The refrigerant in the evaporator 4 absorbs the heat of the chilled water in the circulating water system and evaporates into low-temperature and low-pressure steam. The compressor 1 inhales the refrigerant steam, and after compression , the refrigerant vapor becomes high temperature and high pressure vapor. The high temperature and high pressure refrigerant vapor enters the evaporative condenser 2 . The spray water pump 5 sucks the water in the circulating water tank 6 into the spray water distribution device 7, and the spray water distribution device 7 sprays the spray water. The refrigerant vapor entering the evaporative condenser 2 releases heat, and the spray water sprayed by the spray water distribution device 7 takes away the heat, and condenses the refrigerant vapor into a high-pressure and low-temperature liquid. The condensed high-pressure and low-temperature refrigerant liquid is throttled by the throttling mechanism 3 and becomes a low-pressure and low-temperature liquid, and the low-temperature and low-pressure refrigerant liquid enters the evaporator 4 and undergoes heat-absorbing vaporization again. The cooling process of the chilled water. In addition, during the circulation process, the spray water sprayed by the spray water distribution device 7, after passing through the evaporative condenser 2 and then cooled by the natural cooler 12, flows through the lower evaporative condenser 2 and the natural cooler 12, and falls down. into the circulating water tank 6 for recycling. The natural cooler 12 can conduct heat exchange between the spray water carrying the waste heat and the air, 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 evaporative composite cooling circuit are also in working state, and the outdoor intake air passes through the indirect evaporator 19, and the air state changes under its action, which further reduces the condensation temperature of the evaporative condenser 2, and the indirect evaporator 19 absorbs heat and releases it into the exhaust air through the natural cooler 12. The compression refrigeration system refrigeration has a more direct heat exchange and changes the incoming air state under the action of indirect evaporative cooling, so the condensation temperature will be lower, and the energy efficiency of compression refrigeration will be higher.

2) Combined cooling mode: In this mode, the chilled water of the circulating water system enters the unit through the air-conditioning system return pipe 15, and then the chilled water first passes through the intermediate heat exchanger 13 for pre-cooling, and then enters the three-way valve 14 through port b. It goes out from port c and enters the evaporator 4 to cool down again. The cooled chilled water enters the water supply pipeline 16 of the air conditioning system to provide a cold source for the terminal equipment of the air conditioning system. After absorbing the indoor heat, the chilled water enters again through the return water pipeline 15 of the air conditioning system. The host segment, and so on. The refrigerant side of the evaporator 4 uses a compression refrigeration system to work. The refrigerant in the evaporator 4 absorbs the heat of the chilled water in the circulating water system and evaporates into low-temperature and low-pressure steam. The compressor 1 inhales the refrigerant steam, and after compression , the refrigerant vapor becomes high temperature and high pressure vapor. The high temperature and high pressure refrigerant vapor enters the evaporative condenser 2 . The spray water pump 5 sucks the water in the circulating water tank 6 into the spray water distribution device 7, and the spray water distribution device 7 sprays the spray water. The refrigerant vapor entering the evaporative condenser 2 releases heat, and the spray water sprayed by the spray water distribution device 7 takes away the heat, and condenses the refrigerant vapor into a high-pressure and low-temperature liquid. The condensed high-pressure and low-temperature refrigerant liquid is throttled by the throttling mechanism 3 and becomes a low-pressure and low-temperature liquid, and the low-temperature and low-pressure refrigerant liquid enters the evaporator 4 and undergoes heat-absorbing vaporization again. The cooling process of the chilled water. In addition, during the circulation process, the spray water sprayed by the spray water distribution device 7, after passing through the evaporative condenser 2 and then cooled by the natural cooler 12, flows through the lower evaporative condenser 2 and the natural cooler 12, and falls down. into the circulating water tank 6 for recycling. The natural cooler 12 can conduct heat exchange between the spray water carrying the waste heat and the air, 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 evaporative composite cooling circuit are also in working state, and the outdoor intake air passes through the indirect evaporator 19, and the air state changes under its action, which further reduces the condensation temperature of the evaporative condenser 2, and the indirect evaporator 19 absorbs heat and releases it into the exhaust air through the natural cooler 12. In this mode, a large amount of heat is borne by the natural cooling circuit system, and at the same time, under the action of the indirect evaporator 19, the unit makes this mode intervention time earlier, so the power consumption of the unit in this mode is greatly reduced, and the annual operating energy consumption can also be reduced. drastically reduced.

3), complete natural cooling mode: in this mode, the chilled water of the circulating water system enters the unit through the air-conditioning system return pipe 15, and then the chilled water first passes through the intermediate heat exchanger 13 to cool down, and then passes through the three-way valve 14 b, Port c, evaporator 4, the cooled cooling water passes through the water supply pipeline 16 of the air conditioning system to provide a cold source for the terminal equipment of the air conditioning system, after the chilled water absorbs the indoor heat, it enters the main engine section through the return water pipeline 15 of the air conditioning system again, and so on. cycle. At this time, the compression refrigeration system stops working, and the natural cooling circuit and the indirect evaporative composite cooling circuit are in working state. The cooling water in the intermediate heat exchanger 13 absorbs the heat in the chilled water and is sucked by the cooling circulating water pump 11 . The spray water pump 5 sucks the water in the circulating water tank 6 into the spray water distribution device 7, and the spray water distribution device 7 sprays the spray water. The cooling water entering the natural cooler 12 emits heat, and the spray water sprayed by the spray water distribution device 7 takes away the heat and cools the cooling water. After cooling, the cooling water enters the intermediate heat exchanger 13 of the two circuits to absorb the heat in the refrigeration circulating water system of the other circuit, and circulates in this way. The cooling process of the chilled water in the intermediate heat exchanger 13 is realized. In addition, during the circulation process, the spray water sprayed by the spray water distribution device 7, after being cooled by the evaporative condenser 2, passes through the natural cooler 12, flows through the lower evaporative condenser 2 and the natural cooler 12, and falls into the Circulating water tank 6 for recycling. The evaporative condenser 2 can conduct heat exchange between the spray water carrying waste heat and the air, so that the waste heat is transferred to the air and dissipated into the atmosphere. Since the whole heat is borne by the natural cooling circuit system in this 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 running in winter, because the indirect evaporator 19 will heat the outdoor fresh air, the air in the spray section is always kept above zero, which can effectively solve the risk of freezing in the cooling section.

In addition, during the working process of the three working modes, the exhaust fan 9 will speed up the air flow, and the heat of the refrigerant, cooling water and spray water can also be quickly taken away by the air, so as to improve the heat dissipation efficiency.

FIG. 4 is a schematic diagram of Embodiment 2 of a dual-cold-source chiller based on the indirect evaporative cooling technology of the present invention. In the second embodiment, the intermediate heat exchanger 13 and the cooling circulating water pump 11 are eliminated. A cooling water circuit is formed between the three-way valve 14 , the air-conditioning system return water 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 return pipeline 15 is connected to the indirect evaporator 19, the indirect evaporator 19 is connected to the natural cooler 12, and the natural cooler 12 is connected to the third Through valve 14.

Due to the reduction of the heat exchange links between the natural cooling circuit and the circulating water circuit, the system heat exchange is more direct, and the annual operating time and energy efficiency of the combined cooling mode and the complete natural cooling mode have been greatly improved.

FIG. 5 is a schematic diagram of Embodiment 3 of the present invention. The difference between the third embodiment and the first embodiment is that the order in which the cooling circulating water pump 11 is connected to the natural cooler 12 and the indirect evaporator 19 is different. Specifically, in the third embodiment, the cooling circulating water pump 11 is directly connected to the natural cooling system. The natural cooler 12 is connected to the indirect evaporator 19, which is connected to the intermediate heat exchanger 13 to form an indirect evaporative composite cooling circuit.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above, and it will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but without departing from the spirit or essential aspects of the present invention. features, the invention can be implemented in other specific forms; therefore, the embodiments should be considered in all respects to be exemplary and non-restrictive, the scope of the invention being determined by the appended claims The claims, rather than the description above, are therefore intended to encompass within the invention all changes that come within the meaning and scope of equivalency of the claims, and any reference signs in the claims shall not be construed as limiting the rights involved Require.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. a dual-cold-source chiller refrigeration system based on indirect evaporative cooling technology, comprising the main engine section located in the main engine casing (20) and the cooling section located in the cooling casing (8), it is characterized in that: The main engine section includes: a compression refrigeration circuit, a natural cooling circuit, and a circulating water circuit; The cooling section includes: a spray water circuit, an indirect evaporative composite cooling circuit; The compression refrigeration circuit comprises a compressor (1), an inlet of the compressor (1) is connected to a refrigerant outlet of an evaporator (4), and an outlet of the compressor (1) is connected to an evaporative condenser The intake air inlet of (2), the liquid discharge outlet of the evaporative condenser (2) is connected to the throttling mechanism (3), and the outlet of the throttling mechanism (3) is connected to the refrigerant circuit of the evaporator (4). import; The natural cooling circuit includes a cooling circulating water pump (11), the suction port of the cooling circulating water pump (11) is connected to the cooling water circuit outlet of the intermediate heat exchanger (13), and the water outlet of the cooling circulating water pump (11) is connected To the inlet of the indirect evaporative composite cooling circuit of the cooling section, the cooling water outlet of the indirect evaporative composite cooling circuit of the cooling section is connected to the inlet of the cooling water circuit of the intermediate heat exchanger (13); The circulating water circuit comprises an evaporator (4), the chilled water inlet of the evaporator (4) is connected to the air-conditioning system water supply pipeline (16), and the chilled water outlet of the evaporator (4) is connected to a three-way valve The water outlet a of (14), the water inlets a and b of the three-way valve (14) are further divided into two branches, one branch water inlet a is connected to the air conditioning system return pipe (15), the other The branch water inlet b is connected to the chilled water inlet of the intermediate heat exchanger (13), and the chilled water outlet of the intermediate heat exchanger (13) is connected to the air-conditioning system return water pipeline (15); The spray water circuit comprises a spray water pump (5), the suction port of the spray water pump (5) is connected to the water outlet of the circulating water tank (6), and the water outlet of the spray water pump (5) is connected to the spray cloth Water device (7), the spray water distribution device (7) is located above the evaporative condenser (2) and the natural cooler (12), the evaporative condenser (2) and the natural cooler (12) are located in the circulation Above the water tank (6); The indirect evaporative composite cooling circuit includes an indirect evaporator (19), the water inlet of the indirect evaporator (19) is connected to the outlet of the cooling circulating water pump (11) of the natural cooling circuit, and the water inlet of the indirect evaporator (19) The water outlet is connected to the inlet of the natural cooler (12), and the cooling water outlet of the natural cooler (12) is connected to the cooling water circuit inlet of the intermediate heat exchanger (13) of the natural cooling circuit. 2. A dual-cooling source chiller based on indirect evaporative cooling technology according to claim 1, characterized in that: an exhaust fan (9) is provided in the upper middle part of the cooling box (8), and the exhaust fan The lower part of (9) is an exhaust static pressure device (10). The left and right sides of the exhaust static pressure device (10) are provided with cooling combined sections (17). From top to bottom, it includes: a spray water distribution device (7), an evaporative condenser (2), and a natural cooler (12), and the cooling combined section (17) from left to right includes: ), evaporative condenser (2) and natural cooler (12), water stopper (22), indirect evaporator (19). 3. A dual cold-source chiller based on indirect evaporative cooling technology according to claim 2, characterized in that: the cooling combined section (17) is located in the spray water distribution device (7) and the circulating water tank (6) ) The number of evaporative condensers (2) and natural coolers (12) in the middle and the relationship between upper and lower can be adjusted. 4. A dual-cold source chiller based on indirect evaporative cooling technology according to claim 1, characterized in that: the evaporative condenser (2) comprises a tubular type, a plate type, a plate-and-tube type evaporative condenser and the above methods combination form. 5 . The dual-cold-source chiller based on indirect evaporative cooling technology according to claim 1 , wherein the natural cooler ( 12 ) comprises a coil-type and fin-and-tube heat exchanger. 6 . 6. A dual-cooling source chiller based on indirect evaporative cooling technology according to claim 1, characterized in that: the indirect evaporator (19) comprises a tubular type, a surface cooling type, a rocker type and a combination of the above methods Mode. 7 . The dual-cooling source chiller based on indirect evaporative cooling technology according to claim 6 , wherein the indirect evaporator ( 19 ) adopts counter-current or co-current when the indirect evaporator ( 19 ) adopts the surface cooling type. 8 . 8. A dual cold source chiller based on indirect evaporative cooling technology according to claim 2, characterized in that: the cooling combined section (17) is located in the spray water distribution device (7) and the circulating water tank (6) ) The middle part replaces part of the area of evaporative condenser (2) and natural cooler (12) with packing. 9. A dual-cold source chiller based on indirect evaporative cooling technology according to claim 1, characterized in that: the compression refrigeration circuit and the natural cooling circuit in the main engine section pass through the intermediate partition (18) and the cooling Segments are separated.

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