Transformation method of series air conditioning system of cold water system, series system and control method

Abstract

The invention relates to the technical field of cooling systems in the manufacturing industry, in particular to a transformation method of a cold water system series air conditioning system, a series system and a control method. The transformation method comprises the steps that a, a water collector, a water segregator, a pump station and a heat exchanger are installed; b, arranging a pipeline to connect a water collector to a pump station to a heat exchanger thermal medium channel to the water collector, and additionally arranging a pipeline to connect an air-conditioning system water distributor to a heat exchanger cold medium channel to the air-conditioning system water collector; c, a first temperature sensor is installed at a heat medium outlet of the heat exchanger, and an automatic flow regulating valve is installed at a cold medium inlet and outlet of the heat exchanger; e, a cold water system is connected in series, and pipelines are arranged for connecting an outlet of cold equipment to an inlet of a water collector and connecting an outlet of a water segregator to an inlet of a refrigerator; f, pilot running III, starting a cold using device for testing. Through the technical scheme, the operation load of the cold water system is reduced through the air conditioning system, and the production line shutdown time is shortened in transformation.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling systems in the manufacturing industry, and in particular to a transformation method for connecting a cold water system in series with an air conditioning system, a series connection system and a control method. Background Art

[0002] There are a large number of production equipment in the tobacco production workshop that need to be supplied with cold water for auxiliary heat dissipation, such as the rolling and packaging workshop, the silk-making line, the silk-making auxiliary workshop, etc.

[0003] Take the silk-making auxiliary workshop of a tobacco factory as an example. The production equipment in the silk-making auxiliary workshop is purchased as a whole, and the equipment mainly includes production equipment and process chilled water system. The chilled water system has three refrigeration units with a total cooling power of 120kW, supplying chilled water at 15-20℃ to the production equipment.

[0004] In the actual production process, the production volume of the silk-making auxiliary workshop is large, and the heat generated by the cooling equipment is high. Therefore, the cold water system is in a high-load operation state for a long time, and the refrigerator is frequently started and stopped, resulting in frequent refrigerator failures. In addition, the cold water system and the production equipment of the silk-making auxiliary workshop are mixed together, and real-time monitoring cannot be carried out. Regular inspections can only be carried out, which is also one of the reasons for the high failure rate of the refrigerator. Summary of the invention

[0005] In view of the above-mentioned deficiencies or defects in the prior art, the present invention first provides a method for modifying a cold water system in series with an air-conditioning system. The method can connect the cold water system in series with the air-conditioning system, pre-cool the cold water system through the air-conditioning system, reduce the refrigeration power of the refrigerant in the cold water system, reduce the number of starts and stops, and minimize the impact on production activities during the modification construction.

[0006] The transformation method of the cold water system in series with the air conditioning system includes the following steps:

[0007] a. Equipment installation: a construction area is designated outside the production area of ​​the production line, and water collectors, water distributors, pump stations and heat exchangers are installed in the construction area.

[0008] b. Lay pipes and set up pipes to connect the outlet of the water collector to the inlet of the pump station, the outlet of the pump station to the hot medium inlet of the heat exchanger, the hot medium outlet of the heat exchanger to the water collector, the water distributor of the air-conditioning system to the cold medium inlet of the heat exchanger, and the cold medium outlet of the heat exchanger to the water collector of the air-conditioning system.

[0009] c. Install the control components, install the automatic flow regulating valve on the pipes connecting the cold medium inlet and / or the cold medium outlet of the heat exchanger, and install the flow sensor on the pipes connecting the cold medium inlet and / or the cold medium outlet of the heat exchanger.

[0010] d. Test run I: connect the cold medium flow from the air-conditioning system water distributor to the heat exchanger and then to the air-conditioning system water collector to test the flow control effect of the automatic flow regulating valve.

[0011] e. Connect the cold water system in series, shut down the equipment on the production line, cut off the return water pipeline from the outlet of the cold equipment on the production line to the refrigerator; set up a pipeline to connect the outlet of the cold equipment to the inlet of the water collector, and set up another pipeline to connect the outlet of the water distributor to the inlet of the refrigerator. Install a second temperature sensor on the pipeline from the refrigerator to the inlet of the cold equipment.

[0012] f. Trial operation III: start testing with cold equipment, cold medium logistics and hot medium logistics.

[0013] The path of the cold medium flow is from the air conditioning system water distributor to the heat exchanger to the air conditioning system water collector.

[0014] The path of the heat medium logistics is a circulation path that flows along the cold equipment, water collector, pump station, heat exchanger, water distributor, refrigerator, and cold equipment.

[0015] In some embodiments, in step a, an expansion tank is installed in the construction area, and in step b, the outlet of the expansion tank is connected to the inlet of the pump station.

[0016] In some embodiments, in step b, a bypass pipeline is provided between the outlet of the water collector and the inlet of the water distributor, and a regulating valve is installed on the bypass pipeline.

[0017] In some embodiments, in step c, it also includes installing a first temperature sensor 7 on the pipeline between the heat medium outlet of the heat exchanger 5 and the inlet of the water collector 3; and performing trial operation II after trial operation I in step d.

[0018] Trial operation II: Set up a simulated heat source outside the production area of ​​the production line, and set up pipes to connect the outlet of the water distributor to the inlet of the simulated heat source, and the outlet of the simulated heat source to the inlet of the water collector; turn on the simulated heat source, cold medium logistics and hot medium logistics for testing.

[0019] The path of the cold medium flow is from the air conditioning system water distributor to the heat exchanger to the air conditioning system water collector.

[0020] The path of the heat medium flow is a circulation path along the simulated heat source, water collector, pump station, heat exchanger, water distributor, refrigerator, and simulated heat source.

[0021] In some embodiments, step e removes the internal water tank of the cold water system and changes the open circulation system of the cold water system into a closed circulation system of the heat medium flow.

[0022] In some embodiments, before the equipment in step a is installed, an independent machine room is constructed or demarcated outside the production activity area of ​​the production line, and the construction area is located in the machine room.

[0023] The air conditioning system is arranged in the power workshop, and a control system is added in the power workshop. The control system is connected with a first temperature sensor, an automatic flow regulating valve and a flow sensor, and a second temperature sensor.

[0024] The present invention also proposes a chilled water and air conditioning series system based on the above-mentioned method for transforming the chilled water system in series with the air conditioning system.

[0025] The air conditioning system includes the air conditioning system water distributor, the air conditioning system refrigeration machine and the air conditioning system water collector. The cold water system includes the refrigeration machine and the cold equipment. The cold water and air conditioning series system includes the water collector, pump station, heat exchanger and water distributor.

[0026] The pipeline is sequentially connected to the outlet of the air conditioning system water distributor, the cold medium channel of the heat exchanger, and the inlet of the air conditioning system water collector to form a cold medium logistics pipeline.

[0027] The pipeline sequentially connects the cooling equipment, the water collector, the water collector, the pump station, the heat medium channel of the heat exchanger, the water distributor, the refrigerator, and the cooling equipment to form a ring-shaped heat medium logistics pipeline.

[0028] A first temperature sensor is arranged on the pipe between the hot medium outlet of the heat exchanger and the inlet of the water distributor, a second temperature sensor is installed on the pipe from the refrigerator to the inlet of the cold equipment, an automatic flow regulating valve is arranged on the pipe from the cold medium outlet of the heat exchanger to the inlet of the air conditioning system collector, and a flow sensor is arranged on the pipe connecting the cold medium inlet of the heat exchanger or the cold medium outlet of the heat exchanger.

[0029] In some embodiments, the series system further comprises an expansion tank, in which heat medium is stored, and an outlet of the expansion tank is connected to an inlet of a pump station through a pipeline.

[0030] In some embodiments, the series system further includes a controller, which is arranged in a power workshop together with the air conditioning system, and is electrically connected to the first temperature sensor, the automatic flow regulating valve, and the flow sensor.

[0031] The present invention also proposes a control method for the cold water and air conditioning series system, wherein the second temperature sensor continuously monitors and obtains the temperature of the cooling water flowing into the cooling equipment.

[0032] The following steps are involved:

[0033] S1, determine that the cooling water temperature is lower than a and the duration is greater than t1;

[0034] If yes, execute S2;

[0035] If not, execute S3;

[0036] S2, check whether the refrigerator is turned on;

[0037] If yes, execute S8;

[0038] If no, execute S9;

[0039] S3, determine whether the temperature is greater than b and the duration is greater than t2;

[0040] If yes, execute S4;

[0041] If no, execute S5;

[0042] S4, judging whether the opening of the automatic flow control valve has reached the maximum;

[0043] If yes, execute S6;

[0044] If no, execute S7;

[0045] S5, maintain the current valve opening, and then return to S1;

[0046] S6, turn on the refrigerator, and then return to S1;

[0047] S7, control the automatic flow control valve to increase its opening, increase the flow of cold medium; then return to S1;

[0048] S8, turn off the refrigerator, and then return to S1;

[0049] S9, control the automatic flow control valve to reduce its opening, reduce the flow of cold medium; then return to S1;

[0050] Among them: a is less than b.

[0051] A method for transforming a cold water system in series with an air conditioning system using the above technical solution of the present invention has the following effects:

[0052] Avoiding the production line activity area, the transformation work before step e will not affect the normal production operation of the production line. Only the production line equipment needs to be shut down in step e, and the construction activity in step e is very small. It only needs to cut off the original cold water system pipes, and then use the pipe joints to lay new pipes to the equipment inlet and outlet connections in the installation area. It only needs to stop work for a few hours or 1-2 days. It will not cause the production line to stop for a long time.

[0053] The cold water and air conditioning series system obtained by the above transformation method has the following advantages.

[0054] The series system of the present invention uses the chilled water of the air conditioning system as a cold source to pre-cool the cold water system. The air conditioning system of the factory workshop is always on, and its cooling power is large, which is a stable cold source. The main part of the air conditioning system is usually located in the power workshop and does not interfere with the equipment on the production line. There will be reserved interfaces on the air conditioning system water distributor and the air conditioning system water collector, and the process of connecting the pipes is simple and will not affect the operation of the production line equipment.

[0055] The monitoring of the original chilled water system and the control of the automatic flow control valve by the series connection system can be integrated into the power workshop where the air conditioning system is located. The power workshop usually has long-term on-duty personnel stationed there to monitor the working conditions of the series connection system in real time and improve the stability of system operation.

[0056] At the same time, the present invention also proposes a control method for controlling a series system of cold water and air conditioning, which has the following advantages:

[0057] The cooling water of the air conditioning system is integrated into the original cold water system as a cold source, realizing the series operation of the two systems. This control method effectively reduces the number of starts and stops of the refrigerator, while reducing the cooling power of the refrigerator and the failure rate of the cold water system.

[0058] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a piping diagram of an overall cold water and air conditioning series system of the present invention;

[0060] Figure 2 This is a piping diagram of the air conditioning system before modification in the present invention;

[0061] Figure 3 This is a piping diagram of the cold water system before transformation in the present invention;

[0062] Figure 4 The present invention is a flow chart of a method for controlling a series system of cold water and air conditioning.

[0063] Description of Reference Numerals

[0064] 1- air conditioning system, 1a- air conditioning system water collector, 1b- air conditioning system water distributor;

[0065] 2-cold water system, 2a-refrigeration machine, 2b-cold equipment;

[0066] 3-water collector;

[0067] 4- Pumping station;

[0068] 5-Heat exchanger;

[0069] 6-water distributor;

[0070] 7- first temperature sensor;

[0071] 8-Automatic flow control valve;

[0072] 9-Flow sensor;

[0073] 10-Expansion tank;

[0074] 11-Bypass pipeline;

[0075] 2- Second temperature sensor. DETAILED DESCRIPTION

[0076] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0077] In the present invention, unless otherwise stated, the directional words such as "upper" and "lower" usually refer to the orientation in the assembled state. "Inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0078] The present invention provides a method for transforming a cold water system in series with an air conditioning system, comprising the following steps:

[0079] a. Equipment installation: a construction area is designated outside the production area of ​​the production line, and water collector 3, water distributor 6, pump station 4 and heat exchanger 5 are installed in the construction area.

[0080] b. Lay pipes and set up pipes to connect the outlet of water collector 3 to the inlet of pump station 4, the outlet of pump station 4 to the hot medium inlet of heat exchanger 5, the hot medium outlet of heat exchanger 5 to water collector 3, the air-conditioning system water distributor 1b to the cold medium inlet of heat exchanger 5, and the cold medium outlet of heat exchanger 5 to the air-conditioning system water collector 1a.

[0081] c. Install the control component, install the first temperature sensor 7 on the pipeline between the hot medium outlet of the heat exchanger 5 and the inlet of the water collector 3, install the automatic flow regulating valve 8 on the pipeline connecting the cold medium inlet and / or the cold medium outlet of the heat exchanger 5, and install the flow sensor 9 on the pipeline connecting the cold medium inlet and / or the cold medium outlet of the heat exchanger 5.

[0082] d. Test run I: connect the cold medium flow from the air conditioning system water distributor 1b to the heat exchanger 5 and then to the air conditioning system water collector 1a, and test the flow control effect of the automatic flow control valve 8. The purpose of test run I is to verify whether the cold medium flow (from the air conditioning system water distributor 1b to the heat exchanger 5 to the air conditioning system water collector 1a) can operate normally, whether there are leakages in its pipes and joints, and whether the cold medium flow is normal. Whether the flow sensor 9 and the automatic flow control valve 8 can operate normally. And whether the flow control effect of the automatic flow control valve 8 on the cold medium flow is up to standard, the flow sensor 9 is used to detect the control effect of the automatic flow control valve 8.

[0083] e. Connect the cold water system 2 in series, shut down the equipment on the production line, cut off the return water pipeline from the outlet of the cold equipment 2b on the production line to the refrigerator 2a; set up a pipeline to connect the outlet of the cold equipment 2b to the inlet of the water collector 3, and the outlet of the water distributor 6 to the inlet of the refrigerator 2a. And install a second temperature sensor 12 on the pipeline from the refrigerator 2a to the inlet of the cold equipment 2b;

[0084] like Figure 3 As shown in , the cold water system 2 itself has a closed loop. In the series transformation of the air conditioning system 1 and the cold water system 2 in step e, the closed loop needs to be opened first. At this time, the cold water system 2 can no longer cool the cold equipment 2b, so the cold equipment 2b needs to be closed and the production line production activities need to be stopped.

[0085] Step e includes three core steps: e-1 shuts down the production line, e-2 cuts off the pipeline from the cold-using equipment 2b to the refrigerator 2a, and after the pipeline is cut, two open pipelines are generated, one section is connected to the cold-using equipment 2b, and the other section is connected to the refrigerator 2a, e-3 the open pipeline connected to the cold-using equipment 2b is connected to the reserved interface of the water collector 3, and the open pipeline connected to the refrigerator 2a is connected to the reserved interface of the water distributor 6.

[0086] f. Trial operation III: start the cold equipment 2b, cold medium logistics and hot medium logistics for testing.

[0087] The path of the cold medium flow is from the air conditioning system water distributor 1b to the heat exchanger 5 to the air conditioning system water collector 1a.

[0088] The path of the hot medium flow is a circulation path that flows along the cold equipment 2b, the water collector 3, the pump station 4, the heat exchanger 5, the water distributor 6, the refrigerator 2a, and the cold equipment 2b. In the trial operation III, the operation status of the entire equipment is verified, whether the pipeline is leaking, and whether the pressure and flow meet the standards. Whether the pre-cooling effect of the heat exchanger 5 meets the design requirements.

[0089] If the test runs meet the requirements, the whole transformation process is completed and the obtained cold water and air conditioning series system can be put into use.

[0090] Step a, step b, step c and step d are preliminary construction. During the preliminary construction, the production activities of the production line proceed as usual. After the trial operation I of step d is completed, the equipment on the production line is shut down and the production activities are suspended. After the refrigeration equipment 2b on the production line is shut down, the formal construction stage, i.e. step e and step f, can be entered. Then the production line equipment can be reopened and production can be resumed.

[0091] Step a, step b and step c can be performed simultaneously, and there is no specific order in time. For example, before the pipeline is installed, the control components (first temperature sensor 7, automatic flow control valve 8, flow sensor 9, second temperature sensor 12, etc.) can be installed on the required pipeline in advance. Before step a is constructed, the pipeline can also be laid at the current design position, and then the equipment can be installed, and finally the pipeline can be connected to the inlet and outlet of the equipment.

[0092] The heat exchanger 5 is a plate heat exchanger 5, and there are cold medium pipelines and hot medium pipelines inside the plate heat exchanger 5. Heat is transferred from the hot medium pipeline to the cold medium pipeline to heat the cold medium, and at the same time, the cold medium pipeline also cools the hot medium. The cold medium pipeline has a cold medium inlet and a cold medium outlet, and the hot medium pipeline has a hot medium inlet and a hot medium outlet. Figure 1 and attached Figure 3 In the figure, the lower part of the heat exchanger 5 is the hot medium inlet and the hot medium outlet, and the upper part is the cold medium inlet and the cold medium outlet.

[0093] The pump station 4 includes several water pumps and filters, pressure gauges, and flow meters attached to the water pumps. The pump station 4 usually includes multiple water pumps, and the multiple water pumps serve as backup for each other to ensure stable operation of the system. The multiple water pumps and their respective attached instruments and meters are collectively referred to as the pump station 4.

[0094] Construction area: The actual situation of each factory and workshop is different, so the location of the designated construction area is also different. In general, as long as the construction area is located outside the activity area of ​​the equipment, materials, and personnel of the production line, it will be fine. If the workshop is spacious, a corner of the workshop can be designated as a construction area. Some large factories already have independent rooms in their workshops, which can be converted into construction areas. If the workshop is small, you need to find an open area outside the workshop as a construction area. The construction area is set in an open-air location outside the workshop, and it is necessary to build an independent building with a roof in the construction area in advance to avoid exposing the pipelines, equipment, and instruments in the construction area to the open air.

[0095] Take the reconstruction project of the cold water system 2 of the silk-making auxiliary workshop of a certain tobacco factory mentioned in the background technology of this application as an example. Before the equipment in step a is installed, an independent machine room is constructed or demarcated outside the production activity area of ​​the production line, and the construction area is located in the machine room. The refrigerator 2a of the cold water system 2 of the workshop is originally located in an independent machine room in the workshop. Therefore, the machine room is designated as a construction area on the spot, and the construction and installation of equipment, laying of connecting pipes, and debugging of instruments and meters in the machine room will not affect the operation of the equipment in the silk-making auxiliary workshop, so there is no need to suspend the production activities of the silk-making auxiliary workshop.

[0096] like Figure 1 As shown in FIG. 1 , in step a, an expansion tank 10 is installed in the construction area, and in step b, the outlet of the expansion tank 10 is connected to the inlet of the pump station 4. The expansion tank 10 stores cooling water for cooling the cold equipment 2b, that is, the heat medium in the heat exchanger 5. The expansion tank 10 is used to replenish water to the heat medium circuit.

[0097] A bypass pipe 11 is provided between the outlet of the water collector 3 and the inlet of the water distributor 6, and a regulating valve is installed on the bypass pipe 11. The bypass pipe 11 is used to bypass the heat exchanger 5, and the water in the water collector 3 can flow directly into the water distributor 6 through the bypass pipe 11. The regulating valve is used to open and close the bypass pipe 11. The cold water system 2 itself has a water pump in Figure 3 Although not shown in the figure, the original water pump of the cold water system 2 itself can be used to realize the flow process of cooling water from the cold equipment 2b to the water collector 3 through the bypass pipeline 11 to the water distributor 6.

[0098] Trial run II can avoid problems such as leakage, blockage, and instrument damage that are discovered only after the production line is stopped during trial run III, which may cause the production line to be unable to start production for a long time during the rework and repair process, affecting the production activities of the production line. Therefore, trial run II is carried out after trial run I in step d. Trial run II can test the pre-cooling effect of the heat exchanger 5 and the installation effect of the hot medium logistics pipeline and the cold medium logistics pipeline before step e. If problems are found, they can be repaired in advance, and the production line can continue production operations as usual.

[0099] Trial operation II includes setting up a simulated heat source outside the production area of ​​the production line, setting up a pipeline to connect the outlet of the water distributor 6 to the inlet of the simulated heat source, and the outlet of the simulated heat source to the inlet of the water collector 3; turning on the simulated heat source, cold medium flow and hot medium flow for testing. Set up a simulated heat source, use the simulated heat source instead of the cold equipment 2b, and test in advance whether the hot medium flow is working normally, whether the refrigeration effect of the heat exchanger 5 is normal, and the impact of the heat exchanger 5 on the air conditioning system 1. In the trial operation II stage, the first temperature sensor 7 is used to monitor the pre-cooling effect of the heat exchanger.

[0100] During trial operation II, the path of the cold medium logistics is from the air-conditioning system water distributor (1b) to the heat exchanger 5 to the air-conditioning system water collector 1a; the path of the hot medium logistics is a circulation path along the simulated heat source, water collector 3, pump station 4, heat exchanger 5, water distributor 6, refrigerator 2a, and simulated heat source flow.

[0101] In step e, the internal water tank of the cold water system 2 is removed, and the open circulation system of the cold water system 2 is changed into a closed circulation system of the heat medium flow. However, the original water pump of the cold water system 2 is retained. The retained water pump can pump water for the bypass pipeline 11 when necessary. Figure 1 As shown, a closed circulation system is the abbreviation of a closed pipeline water circulation system. The water in this system is closed in the pipeline and circulates without contact with the atmosphere. Regardless of whether the water pump is running, the pipeline is full of water. An open circulation system is opposite to a closed circulation system, and at least one of its pipelines is open. The original cold water system 2 is an open circulation system, which includes a water tank. The water in the water tank will come into contact with the air, and the water in the water tank will not be pressurized.

[0102] The air conditioning system 1 is arranged in the power workshop, and a control system is added in the power workshop, and the control system is connected to the first temperature sensor 7, the automatic flow regulating valve 8 and the flow sensor 9, and the second temperature sensor 12. The refrigeration machine 2a of the air conditioning system 1 is usually arranged in an independent room, which is generally called the power workshop in the industry. In this article, the power workshop is the workshop where the air conditioning system 1 is installed.

[0103] Through the above-mentioned transformation method of connecting the cold water system 2 in series with the air conditioning system 1, the second subject of the present application, the cold water and air conditioning series system, can be obtained. Figure 1 .

[0104] The air conditioning system 1 is shown in the attached Figure 2 , including an air-conditioning system water distributor 1b, an air-conditioning system refrigeration machine 1 and an air-conditioning system water collector 1a.

[0105] Cold water system 2 reference attachment Figure 3 , including a refrigerator 2a and a cold-using device 2b; the cold water and air-conditioning series system includes a water collector 3, a pump station 4, a heat exchanger 5, and a water distributor 6.

[0106] The pipeline of the cold water and air conditioning series system is connected in sequence to the outlet of the air conditioning system water distributor 1b, the cold medium channel of the heat exchanger 5, and the inlet of the air conditioning system water collector 1a to form a cold medium logistics pipeline.

[0107] The pipeline sequentially connects the cooling equipment 2b, the water collector 3, the water collector 3, the pump station 4, the heat medium channel of the heat exchanger 5, the water distributor 6, the refrigerator 2a, and the cooling equipment 2b to form a ring-shaped heat medium logistics pipeline.

[0108] A first temperature sensor 7 is provided on the pipeline between the hot medium outlet of the heat exchanger 5 and the inlet of the water distributor 6, an automatic flow regulating valve 8 is provided on the pipeline between the cold medium outlet of the heat exchanger 5 and the inlet of the air conditioning system water collector 1a, and a flow sensor 9 is provided on the pipeline connecting the cold medium inlet of the heat exchanger 5 or the cold medium outlet of the heat exchanger 5. A second temperature sensor 12 is provided on the pipeline from the refrigerator 2a to the inlet of the cold equipment 2b.

[0109] The second temperature sensor 12 is linked with the automatic flow control valve 8 to adjust the power of the heat exchanger 5. The automatic flow control valve 8 is used to automatically adjust the cooling water temperature of the cooling device 2b. The start-stop frequency and workload of the refrigerator 2a are reduced. The specific control method will be described in detail later.

[0110] like Figure 1 As shown, the series system also includes an expansion tank 10, which stores a heat medium, and the outlet of the expansion tank 10 is connected to the inlet of the pump station 4 through a pipeline. The series system also includes a controller, which is arranged in the power workshop with the air conditioning system 1, and is electrically connected to the first temperature sensor 7, the automatic flow regulating valve 8, the flow sensor 9, and the second temperature sensor 12. A bypass pipeline 11 is also arranged between the water collector 3 and the water distributor 6.

[0111] A method for controlling a series system of cold water and air conditioning, characterized in that a second temperature sensor 12 continuously monitors and obtains the temperature of the cooling water flowing into the cooling device 2b;

[0112] The following steps are involved:

[0113] S1, determine that the cooling water temperature is lower than a and the duration is greater than t1;

[0114] If yes, execute S2;

[0115] If not, execute S3;

[0116] S2, detecting whether the refrigerator 2a is turned on;

[0117] If yes, execute S8;

[0118] If no, execute S9;

[0119] S3, determine whether the temperature is greater than b and the duration is greater than t2;

[0120] If yes, execute S4;

[0121] If no, execute S5;

[0122] S4, judging whether the opening of the automatic flow regulating valve 8 control valve has reached the maximum;

[0123] If yes, execute S6;

[0124] If no, execute S7;

[0125] S5, maintain the current valve opening, and then return to S1;

[0126] S6, start the refrigerator 2a, and then return to S1;

[0127] S7, control the automatic flow regulating valve 8 to increase its opening, increase the flow of cold medium; then return to S1;

[0128] S8, turn off the refrigerator 2a, and then return to S1;

[0129] S9, control the automatic flow regulating valve 8 to reduce its opening, thereby reducing the flow of the cold medium; then return to S1;

[0130] Among them: a is less than b.

[0131] In the attached Figure 1 In the specific embodiment, there are multiple second temperature sensors 12. Because the original cold water system includes multiple pipelines to supply cold water to the cold equipment. Under the condition of including multiple second temperature sensors 12, the average value or the middle value detected by the multiple second temperature sensors 12 can be taken as the cooling water temperature at the inlet of the cold equipment 2b.

[0132] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0133] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0134] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for transforming a cold water system in series with an air conditioning system, characterized in that: The following steps are involved: a. Equipment installation, A construction area is defined outside the production area of ​​the production line, and a water collector (3), a water distributor (6), a pump station (4) and a heat exchanger (5) are installed in the construction area; b. Laying pipelines, Pipes are provided to connect the outlet of the water collector (3) to the inlet of the pump station (4), the outlet of the pump station (4) to the hot medium inlet of the heat exchanger (5), the hot medium outlet of the heat exchanger (5) to the water collector (3), the air conditioning system water distributor (1b) to the cold medium inlet of the heat exchanger (5), and the cold medium outlet of the heat exchanger (5) to the air conditioning system water collector (1a); c. Install control components, An automatic flow regulating valve (8) is installed on a pipeline connected to a cold medium inlet and / or a cold medium outlet of a heat exchanger (5), and a flow sensor (9) is installed on a pipeline connected to a cold medium inlet and / or a cold medium outlet of a heat exchanger (5); d. Trial operation I, Connect the cold medium flow from the air conditioning system water distributor (1b) to the heat exchanger (5) and then to the air conditioning system water collector (1a) to test the flow control effect of the automatic flow regulating valve (8); e. Series cold water system, The equipment on the production line is turned off, and the return water pipeline from the water outlet of the cooling equipment (2b) on the production line to the refrigerator (2a) is cut off; a pipeline is set to connect the outlet of the cooling equipment (2b) to the inlet of the water collector (3), and another pipeline is set to connect the outlet of the water distributor (6) to the inlet of the refrigerator (2a); a second temperature sensor (12) is installed on the pipeline from the refrigerator (2a) to the inlet of the cooling equipment (2b); f. Trial operation III, Turn on the cold equipment (2b) to test the cold medium flow and the hot medium flow; The path of the cold medium flow is from the air conditioning system water distributor (1b) to the heat exchanger (5), and then to the air conditioning system water collector (1a); The path of the heat medium flow is: a circulation path that flows along the cold equipment (2b), the water collector (3), the pump station (4), the heat exchanger (5), the water distributor (6), the refrigerator (2a), and the cold equipment (2b).

2. The method for transforming a cold water system in series with an air conditioning system according to claim 1, characterized in that: In step a, an expansion tank (10) is installed in a construction area; In step b, the outlet of the expansion tank (10) is connected to the inlet of the pump station (4).

3. The method for transforming a cold water system in series with an air conditioning system according to claim 1, characterized in that: In step b, a bypass pipeline (11) is provided between the outlet of the water collector (3) and the inlet of the water distributor (6), and a regulating valve is installed on the bypass pipeline (11).

4. The method for transforming a cold water system in series with an air conditioning system according to claim 1, characterized in that: In step c, it also includes installing a first temperature sensor (7) on the pipeline between the heat medium outlet of the heat exchanger (5) and the inlet of the water collector (3); After the trial run I in step d, the trial run II is performed; Trial operation II includes: setting a simulated heat source outside the production area of ​​the production line, setting a pipeline to connect the outlet of the water distributor (6) to the inlet of the simulated heat source, and the outlet of the simulated heat source to the inlet of the water collector (3); starting the simulated heat source, cold medium flow and hot medium flow for testing; The path of the cold medium flow is from the air conditioning system water distributor (1b) to the heat exchanger (5) and then to the air conditioning system water collector (1a); The path of the heat medium flow is a circulation path along the simulated heat source, the water collector (3), the pump station (4), the heat exchanger (5), the water distributor (6), the refrigerator (2a), and the simulated heat source.

5. The method for transforming a cold water system in series with an air conditioning system according to claim 1, characterized in that: In the step e, the internal water tank of the cold water system (2) is removed, and the open circulation system of the cold water system (2) is changed into a closed circulation system of the heat medium flow.

6. The method for transforming a cold water system in series with an air conditioning system according to claim 4, characterized in that: Before the equipment is installed, a separate machine room is constructed or designated outside the production area of ​​the production line, and the construction area is located in the machine room; The air conditioning system (1) is arranged in a power workshop, and a control system is added in the power workshop. The control system is connected to a first temperature sensor (7), a second temperature sensor (12), an automatic flow regulating valve (8) and a flow sensor (9).

7. A cold water and air conditioning series system, characterized in that: It comprises an air conditioning system (1), a cold water system (2), a water collector (3), a pump station (4), a heat exchanger (5), and a water distributor (6); the air conditioning system (1) comprises an air conditioning system water distributor (1b), an air conditioning system refrigerator, and an air conditioning system water collector (1a); the cold water system (2) comprises a refrigerator (2a) and a cold-using device (2b); The pipeline sequentially connects the outlet of the air conditioning system water distributor (1b), the cold medium channel of the heat exchanger (5), and the inlet of the air conditioning system water collector (1a) to form a cold medium logistics pipeline; The pipeline sequentially connects the cooling equipment (2b), the water collector (3), the pump station (4), the heat medium channel of the heat exchanger (5), the water distributor (6), the refrigerator (2a), and the cooling equipment (2b) to form a ring-shaped heat medium flow pipeline; A first temperature sensor (7) is provided on the pipeline between the hot medium outlet of the heat exchanger (5) and the inlet of the water distributor (6), a second temperature sensor (12) is installed on the pipeline from the refrigerator (2a) to the inlet of the cold equipment (2b), an automatic flow regulating valve (8) is provided on the pipeline from the cold medium outlet of the heat exchanger (5) to the inlet of the air conditioning system water collector (1a), and a flow sensor (9) is provided on the pipeline connecting the cold medium inlet of the heat exchanger (5) or the cold medium outlet of the heat exchanger (5).

8. The cold water and air conditioning series system according to claim 7, characterized in that: The series system also includes an expansion tank (10), in which a heat release medium is stored, and an outlet of the expansion tank (10) is connected to an inlet of a pump station (4) through a pipeline.

9. The cold water and air conditioning series system according to claim 7, characterized in that: The series system also includes a controller. The controller and the air conditioning system (1) are arranged in a power workshop. The controller is electrically connected to a first temperature sensor (7), an automatic flow regulating valve (8), and a flow sensor (9) respectively.

10. A method for controlling a chilled water and air conditioning series system as claimed in any one of claims 7 to 9, characterized in that: The second temperature sensor (12) continuously monitors and obtains the temperature of the cooling water flowing into the cooling device (2b); The following steps are involved: S1, determine that the cooling water temperature is lower than a and the duration is greater than t1; If yes, execute S2; If not, execute S3; S2, detecting whether the refrigerator (2a) is turned on; If yes, execute S8; If no, execute S9; S3, determine whether the temperature is greater than b and the duration is greater than t2; If yes, execute S4; If no, execute S5; S4, judging whether the opening of the automatic flow control valve (8) has reached the maximum; If yes, execute S6; If no, execute S7; S5, maintain the current valve opening, and then return to S1; S6, start the refrigerator (2a), and then return to S1; S7, control the automatic flow control valve (8) to increase its opening, thereby increasing the flow of the cold medium; then return to S1; S8, turn off the refrigerator (2a), and then return to S1; S9, control the automatic flow control valve (8) to reduce its opening, thereby reducing the flow of the cold medium; then return to S1; Among them: a is less than b.

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