Combined cooling structure of low-temperature system in refrigerating machine room

Abstract

The utility model relates to a combined cold supply structure of a medium-low temperature system in a refrigerating machine room. The combined cold supply structure structurally comprises a common low-temperature water chilling unit, a standby low-temperature water chilling unit, a standby medium-temperature water chilling unit and a common medium-temperature water chilling unit. And the standby units sum the refrigerating capacity of the low-temperature refrigerating capacity common units. The low-temperature refrigerating system has the advantages that the structural design is reasonable, and the problems that standby machines are repeatedly arranged in a low-temperature refrigerating system in a refrigerating machine room in the prior art, waste is caused, refrigerating system operation control means are deficient, the energy-saving strategy is single, and the standby machines cannot participate in daily operation are solved. On the basis that the safety and reliability of a factory are met, the investment of the refrigerating system is reduced to the maximum extent, the operation strategy of the refrigerating system is expanded, and the flexibility of system adjustment is enhanced; and the annual operation energy consumption of the water chilling unit is reduced, and the annual comprehensive energy efficiency value of the machine room is powerfully improved.

Description

Technical Field

[0001] The utility model relates to a combined cooling supply structure for a low-temperature system in a refrigeration machine room, and particularly to a combined cooling supply structure for a medium-low temperature system that improves the utilization rate of standby chillers in an efficient cold source system for an industrial plant refrigeration machine room. Background Art

[0002] As a key area of energy consumption, industrial plants play a crucial role in the overall social energy consumption. In industrial plants, refrigeration machine rooms are key public energy-consuming facilities. Although the energy conservation of central air conditioners has made great progress in recent years, the energy conservation work of refrigeration stations still has a long way to go.

[0003] In the prior art, the medium-low temperature systems in refrigeration stations are gradually separated. Compared with supplying a single low-temperature cold source, after the separation of the medium-low temperature systems, the cooling supply temperature of the medium-temperature system increases, and the comprehensive energy efficiency of the system improves, which helps to reduce the energy consumption of users and avoid the grade loss caused by medium-low temperature heat exchange in the unified supply of low-temperature water. However, in industries such as semiconductors and new energy, the stability requirements for refrigeration systems are very high, and standby equipment needs to be set for each system. After adopting the medium-low temperature system separation scheme, the system investment increases.

[0004] After the separation of the medium-low temperature systems in the current refrigeration station, standby chillers usually do not participate in the daily operation of the system. Only when the common chillers fail, the standby chillers are put into use; in this way, the standby chillers do not participate in the daily operation of the refrigeration system, causing a certain waste of equipment investment.

[0005] In addition, in some industrial fields and humid and hot areas in the south, there is a certain period of time throughout the year with a relatively high peak cooling load, but the time required for peak cooling is very short; when the refrigeration system is designed according to the peak cooling load, the investment is large and the equipment utilization rate is not high, which also causes a certain waste.

[0006] For example, in Guangdong region from March to May, the weather humidity is relatively high, and the refrigeration system is mainly based on dehumidification load; compared with the refrigeration load in July and August, to cope with the dehumidification load during the "returning south day", it may be necessary to increase the configuration capacity of chillers, but the increased refrigeration capacity has a low annual utilization rate and a poor investment cost performance.

[0007] There is an urgent need for a solution that can meet the peak cooling load requirements of the project, reduce system investment, and at the same time meet the standby, safety, and reliability of the system. Summary of the Utility Model

[0008] The present utility model provides a combined cooling supply structure for a low-temperature system in a refrigeration machine room, aiming to overcome the above-mentioned deficiencies in the prior art, improve the utilization rate of standby chillers, and enhance the overall safety, reliability, controllability, and energy efficiency of the machine room.

[0009] The technical solution of the present utility model: A combined cooling supply structure for a low-temperature system in a refrigeration machine room, the structure of which includes a common low-temperature chiller, a standby low-temperature chiller, a standby medium-temperature chiller, and a common medium-temperature chiller. The common low-temperature chiller, the standby low-temperature chiller, the standby medium-temperature chiller, and the common medium-temperature chiller are respectively externally connected to cooling water through cooling water connection ports; the outlets of the common low-temperature chiller, the standby low-temperature chiller, the standby medium-temperature chiller, and the common medium-temperature chiller are all sequentially connected to the main chilled water supply pipe; the evaporator inlets of the common low-temperature chiller, the standby low-temperature chiller, the standby medium-temperature chiller, and the common medium-temperature chiller are respectively connected to the outlets of a A chilled water circulation pump, a B chilled water circulation pump, a C chilled water circulation pump, and a D chilled water circulation pump. The inlets of the A chilled water circulation pump, the B chilled water circulation pump, the C chilled water circulation pump, and the D chilled water circulation pump are all sequentially connected to the main chilled water return pipe; the main chilled water supply pipe and the main chilled water return pipe are respectively connected to a low-temperature cooling supply system and a medium-temperature cooling supply system; the low-temperature cooling supply system is close to the common low-temperature chiller, and the medium-temperature cooling supply system is close to the common medium-temperature chiller; an A electric valve, a B electric valve, a C electric valve, a D electric valve, an E electric valve, and an F electric valve are respectively arranged on the main chilled water supply pipe between the common low-temperature chiller and the standby low-temperature chiller, the main chilled water return pipe between the common low-temperature chiller and the standby low-temperature chiller, the main chilled water supply pipe between the standby low-temperature chiller and the standby medium-temperature chiller, the main chilled water return pipe between the standby low-temperature chiller and the standby medium-temperature chiller, the main chilled water supply pipe between the standby medium-temperature chiller and the common medium-temperature chiller, and the main chilled water return pipe between the standby medium-temperature chiller and the common medium-temperature chiller.

[0010] Preferably, the total low-temperature cooling capacity of the standby low-temperature chiller and the standby medium-temperature chiller is not less than the cooling capacity of the common low-temperature chiller, and the total medium-temperature cooling capacity of the standby low-temperature chiller and the standby medium-temperature chiller is not less than the cooling capacity of the common medium-temperature chiller.

[0011] The advantages of the present utility model: The structure is reasonably designed, solving the problems in the prior art such as waste caused by repeated setting of standby machines in the low-temperature refrigeration system of the refrigeration machine room, lack of operation control means for the refrigeration system, single energy-saving strategy, and failure of standby machines to participate in daily operation. On the basis of meeting the safety and reliability of the factory, the investment in the refrigeration system is reduced to the greatest extent, the operation strategy of the refrigeration system is expanded, and the flexibility of system adjustment is enhanced; and the annual operation energy consumption of the chiller is reduced and the annual comprehensive energy efficiency value of the machine room is effectively improved. Its effects and advantages are specifically as follows:

[0012] 1) The low- and medium-temperature refrigeration systems are respectively equipped with dual-condition chillers as backups. The total refrigerating capacity of the two dual-condition chillers is not less than the refrigerating capacity of each single low-temperature chiller and single medium-temperature chiller, enabling the backup of chillers for the low-temperature and medium-temperature refrigeration systems. The application of the dual-condition backup chillers can reduce the capacity of one backup unit and lower the investment.

[0013] 2) Split the capacity of one dual-condition backup unit into the capacities of two backup units, that is, the backup unit for the low-temperature chiller and the backup unit for the medium-temperature chiller jointly serve as the backup chillers for the low- and medium-temperature refrigeration systems. The backup chillers can participate in daily operation. The separately set backup units for the low- and medium-temperature refrigeration enhance the flexibility of system regulation, achieve better energy efficiency, and do not affect the safety and reliability of the system.

[0014] 3) The number of units can be set according to the actual demand of the medium-temperature system with multiple dual-condition units. When dealing with low-temperature demands such as dehumidification, the differences in the cooling supply time and space of the low- and medium-temperature systems can be utilized. The dual-condition medium-temperature units can be used to achieve low-temperature refrigeration through the switching of pipelines, avoiding the selection of the low-temperature system according to the peak load, reducing the investment in system equipment configuration, and meeting the requirements of system safety backup at the same time.

[0015] 4) The low- and medium-temperature systems are interconnected through the main supply and return pipes of the chilled water and the switching of electric valves, realizing the mutual complementation of the low- and medium-temperature systems and the switching of equipment, greatly enriching the operation regulation strategies of the system, enhancing the safety and stability of the system, and playing an important role in improving the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the combined cooling supply structure of the low- and medium-temperature systems in the refrigeration machine room of the present utility model.

[0017] In the figure, 1 is the common low-temperature chiller, 2 is the backup low-temperature chiller, 3 is the backup medium-temperature chiller, 4 is the common medium-temperature chiller, 5 is the cooling water, 6 is the A chilled water circulation pump, 7 is the B chilled water circulation pump, 8 is the C chilled water circulation pump, 9 is the D chilled water circulation pump, 10 is the A electric valve, 11 is the B electric valve, 12 is the C electric valve, 13 is the D electric valve, 14 is the E electric valve, 15 is the F electric valve, 16 is the main chilled water supply pipe, 17 is the main chilled water return pipe, 18 is the low-temperature cooling supply system, and 19 is the medium-temperature cooling supply system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be further described in detail below in combination with the embodiments and specific implementation manners.

[0019] Such as Figure 1As shown in the figure, a combined low-temperature cooling structure in a refrigeration machine room includes a common low-temperature chiller 1, a standby low-temperature chiller 2, a standby medium-temperature chiller 3, and a common medium-temperature chiller 4. The common low-temperature chiller 1, the standby low-temperature chiller 2, the standby medium-temperature chiller 3, and the common medium-temperature chiller 4 are respectively externally connected to cooling water 5 through cooling water connection ports.

[0020] The outlets of the common low-temperature chiller 1, the standby low-temperature chiller 2, the standby medium-temperature chiller 3, and the common medium-temperature chiller 4 are all sequentially connected to the chilled water supply main pipe 16.

[0021] The evaporator inlets of the common low-temperature chiller 1, the standby low-temperature chiller 2, the standby medium-temperature chiller 3, and the common medium-temperature chiller 4 are respectively connected to the outlets of the A chilled water circulation pump 6, the B chilled water circulation pump 7, the C chilled water circulation pump 8, and the D chilled water circulation pump 9. The inlets of the A chilled water circulation pump 6, the B chilled water circulation pump 7, the C chilled water circulation pump 8, and the D chilled water circulation pump 9 are all sequentially connected to the chilled water return main pipe 17.

[0022] The chilled water supply main pipe 16 and the chilled water return main pipe 17 are respectively connected to the low-temperature cooling system 18 and the medium-temperature cooling system 19; the low-temperature cooling system 18 is close to the common low-temperature chiller 1, and the medium-temperature cooling system 19 is close to the common medium-temperature chiller 4; the A electric valve 10, the B electric valve 11, the C electric valve 12, the D electric valve 13, the E electric valve 14, and the F electric valve 15 are respectively arranged on the chilled water supply main pipe 16 between the common low-temperature chiller 1 and the standby low-temperature chiller 2, the chilled water return main pipe 17 between the common low-temperature chiller 1 and the standby low-temperature chiller 2, the chilled water supply main pipe 16 between the standby low-temperature chiller 2 and the standby medium-temperature chiller 3, the chilled water return main pipe 17 between the standby low-temperature chiller 2 and the standby medium-temperature chiller 3, the chilled water supply main pipe 16 between the standby medium-temperature chiller 3 and the common medium-temperature chiller 4, and the chilled water return main pipe 17 between the standby medium-temperature chiller 3 and the common medium-temperature chiller 4.

[0023] The standby low-temperature chiller 2 and the standby medium-temperature chiller 3 are both dual-condition chillers. The total low-temperature cooling capacity of the standby low-temperature chiller 2 and the standby medium-temperature chiller 3 is not less than the cooling capacity of the common low-temperature chiller 1, and the total medium-temperature cooling capacity of the standby low-temperature chiller 2 and the standby medium-temperature chiller 3 is not less than the cooling capacity of the common medium-temperature chiller 4. The combination of the standby low-temperature chiller 2 and the standby medium-temperature chiller 3 can effectively undertake the standby tasks of the common low-temperature chiller 1 or the common medium-temperature chiller 4.

[0024] According to the above structure, the chilled water pipelines of the medium and low temperature refrigeration system are connected together, and the medium and low temperature refrigeration system is isolated through electric valves. Moreover, the scope and boundary of the medium and low temperature refrigeration system can be flexibly changed according to the project operation needs to meet the requirements of various operating conditions at the end. At the same time, the standby machine is "split into two", and it can participate in the daily operation of the system when necessary, enriching the operation mode of the system and improving the system energy efficiency.

[0025] During operation, it can be divided into the following operating conditions:

[0026] Electric valve 12 of C and electric valve 13 of D are closed, and electric valve 10 of A, electric valve 11 of B, electric valve 14 of E and electric valve 15 of F are opened:

[0027] At this time, the return water of the low-temperature chilled water at the end enters the common low-temperature chiller 1 through the A chilled water circulation pump 6. After being refrigerated by the chiller, the low-temperature chilled water is supplied to the chilled water supply main pipe 16 and then to the end low-temperature cooling system 18. At this time, the standby low-temperature chiller 2 is in the standby state. The return water of the medium-temperature chilled water in the end medium-temperature cooling system 19 enters the common medium-temperature chiller 4 through the D chilled water circulation pump 9. After being refrigerated by the chiller, the medium-temperature chilled water is supplied to the chilled water supply main pipe 16 and then to the end medium-temperature cooling system 19. At this time, the standby medium-temperature chiller 3 is in the standby state. In this operating condition, the standby low-temperature chiller 2 and the standby medium-temperature chiller 3 can also participate in the operation for system regulation, so that each chiller operates in the high-efficiency range, improving the comprehensive energy efficiency of the system.

[0028] Electric valve 10 of A and electric valve 11 of B are closed, and electric valve 12 of C, electric valve 13 of D, electric valve 14 of E and electric valve 15 of F are opened:

[0029] At this time, the return water of the low-temperature chilled water at the end enters the common low-temperature chiller 1 through the A chilled water circulation pump 6. After being refrigerated by the chiller, the low-temperature chilled water is supplied to the chilled water supply main pipe 16 and then to the end low-temperature cooling system 18. The standby low-temperature chiller 2 and the standby medium-temperature chiller 3 both belong to the scope of the medium-temperature refrigeration system. The medium-temperature return water at the end enters the B chilled water circulation pump 7, C chilled water circulation pump 8, and D chilled water circulation pump 9 respectively through the chilled water return main pipe 17, and then enters the standby low-temperature chiller 2, the standby medium-temperature chiller 3 and the common medium-temperature chiller 4. After being refrigerated by the chiller, it enters the chilled water pipeline and is supplied to the end medium-temperature cooling system 19. At this time, the standby low-temperature chiller 2 and the standby medium-temperature chiller 3 can work together to realize the standby of the common medium-temperature chiller 4. The standby low-temperature chiller 2 and the standby medium-temperature chiller 3 can also work simultaneously with the common medium-temperature chiller 4 to cope with the medium-temperature peak load.

[0030] Electric valve 14 of E and electric valve 15 of F are closed, and electric valve 10 of A, electric valve 11 of B, electric valve 12 of C and electric valve 13 of D are opened:

[0031] At this time, the return water of the medium-temperature chilled water at the end enters the common medium-temperature chiller 4 through the D chilled water circulation pump 9. After being refrigerated by the chiller, the chilled water is supplied to the chilled water supply main pipe 16, and then to the end medium-temperature cooling system 19; the standby low-temperature chiller 2 and the standby medium-temperature chiller 3 both belong to the low-temperature refrigeration system range at this time. The low-temperature return water at the end enters the A chilled water circulation pump 6, B chilled water circulation pump 7, and C chilled water circulation pump 8 through the chilled water return main pipe 17 respectively, and then enters the common low-temperature chiller 1, standby low-temperature chiller 2, and standby medium-temperature chiller 3. After being refrigerated by the chiller, it enters the chilled water pipeline and is supplied to the end low-temperature cooling system 18. At this time, the standby low-temperature chiller 2 and the standby medium-temperature chiller 3 can work together to achieve the standby of the common low-temperature chiller 1. At the same time, the standby low-temperature chiller 2 and the standby medium-temperature chiller 3 can also work with the common low-temperature chiller 1 to cope with the low-temperature peak load.

[0032] The application of the above structure can effectively enrich the operation mode and control strategy of the refrigeration station. The separately set standby chillers can serve the operation adjustment of their respective systems separately, or can work together to meet the standby requirements of the chillers in the medium-low temperature refrigeration system. At the same time, it can solve the peak load problem that may occur in the medium-low temperature refrigeration system. The ingenious setting of the dual-condition chiller can reduce the capacity of one standby chiller and reduce the investment cost of the system. The setting of multiple groups of electric valve devices in the chilled water pipeline system can make the medium-low temperature system flexibly switch under various combinations, such as the standby low-temperature chiller 2 serving the low-temperature refrigeration system, the standby medium-temperature chiller 3 serving the medium-temperature refrigeration system, and at the same time, the standby low-temperature chiller 2 and the standby medium-temperature chiller 3 serving the low-temperature refrigeration system or the medium-temperature refrigeration system together, realizing the mutual standby of equipment and the mutual supplement of cooling capacity between the medium-low temperature refrigeration systems, greatly enhancing the safety and stability of the refrigeration system. At the same time, the flexible and changeable combination strategy also provides assistance for improving the system energy efficiency.

[0033] The common low-temperature chiller 1 is a low-temperature 2100RT chiller.

[0034] The standby low-temperature chiller 2 and the standby medium-temperature chiller 3 are dual-condition chillers with a low temperature of 1050RT and a medium temperature of 1250RT.

[0035] The common medium-temperature chiller 4 is a medium-temperature 2500RT chiller.

[0036] The supply water temperature of the common low-temperature chiller 1 and the standby low-temperature chiller 2 is 7°C, and the return water temperature is 12°C.

[0037] The supply water temperature of the standby medium-temperature chiller and the common medium-temperature chiller 4 is 13°C, and the return water temperature is 18°C.

[0038] All the components described above are prior arts, and those skilled in the art can use any models and existing designs that can achieve their corresponding functions.

[0039] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the creative concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A combined cooling supply structure for a low-temperature system in a refrigeration machine room, characterized in that, It includes a common low-temperature chiller (1), a standby low-temperature chiller (2), a standby medium-temperature chiller (3) and a common medium-temperature chiller (4). The common low-temperature chiller (1), the standby low-temperature chiller (2), the standby medium-temperature chiller (3) and the common medium-temperature chiller (4) are respectively externally connected to cooling water (5) through cooling water connection ports; the outlets of the common low-temperature chiller (1), the standby low-temperature chiller (2), the standby medium-temperature chiller (3) and the common medium-temperature chiller (4) are all sequentially connected to the chilled water supply main pipe (16); the evaporator inlets of the common low-temperature chiller (1), the standby low-temperature chiller (2), the standby medium-temperature chiller (3) and the common medium-temperature chiller (4) are respectively connected to the outlets of the A chilled water circulation pump (6), the B chilled water circulation pump (7), the C chilled water circulation pump (8), and the D chilled water circulation pump (9), and the inlets of the A chilled water circulation pump (6), the B chilled water circulation pump (7), the C chilled water circulation pump (8), and the D chilled water circulation pump (9) are all sequentially connected to the chilled water return main pipe (17); the chilled water supply main pipe (16) and the chilled water return main pipe (17) are respectively connected to the low-temperature cooling system (18) and the medium-temperature cooling system (19); the low-temperature cooling system (18) is close to the common low-temperature chiller (1), and the medium-temperature cooling system (19) is close to the common medium-temperature chiller (4); the A electric valve (10), the B electric valve (11), the C electric valve (12), the D electric valve (13), the E electric valve (14) and the F electric valve (15) are respectively arranged on the chilled water supply main pipe (16) between the common low-temperature chiller (1) and the standby low-temperature chiller (2), the chilled water return main pipe (17) between the common low-temperature chiller (1) and the standby low-temperature chiller (2), the chilled water supply main pipe (16) between the standby low-temperature chiller (2) and the standby medium-temperature chiller (3), the chilled water return main pipe (17) between the standby low-temperature chiller (2) and the standby medium-temperature chiller (3), the chilled water supply main pipe (16) between the standby medium-temperature chiller (3) and the common medium-temperature chiller (4), and the chilled water return main pipe (17) between the standby medium-temperature chiller (3) and the common medium-temperature chiller (4).

2. The combined cooling supply structure for a low-temperature system in a refrigeration machine room according to claim 1, characterized in that The total low-temperature refrigerating capacity of the described standby low-temperature chiller (2) and standby medium-temperature chiller (3) ≥ the refrigerating capacity of the common low-temperature chiller (1), and the total medium-temperature refrigerating capacity of the standby low-temperature chiller (2) and standby medium-temperature chiller (3) ≥ the refrigerating capacity of the common medium-temperature chiller (4).

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