Control method and device for year-round cooling of special process flow and year-round cooling unit

Abstract

The present invention relates to the technical field of year-round cooling, and specifically discloses a control method for year-round cooling of a special process flow, comprising: obtaining the current return water temperature of a year-round cooling unit, the year-round cooling unit including two compressors; judging whether the current return water temperature of the year-round cooling unit meets the set temperature; when the set temperature is not met, outputting a load instruction or a load reduction instruction to adjust the operating conditions of the compressors in the year-round cooling unit until the return water temperature of the year-round cooling unit meets the set temperature; when the set temperature is met, outputting a hold instruction to stop adjusting the operating conditions of the compressors in the year-round cooling unit, and operating the year-round cooling unit according to the current operating conditions of the compressors in the year-round cooling unit. The present invention also discloses a control device for year-round cooling of a special process flow and a year-round cooling unit. The present invention can ensure normal operation throughout the year, can adapt to process flows with rapid changes in cooling load, and achieve process cooling water temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of year-round cooling, and in particular to a control method for year-round cooling of a special process flow, a control device for year-round cooling of a special process flow, and a year-round cooling unit including the control device for year-round cooling of a special process flow. Background Art

[0002] Industrial production processes in pharmaceuticals, chemicals, power electronics, precision instruments, and food processing often require process cooling for process equipment, necessitating a cooling system that can provide water cooling year-round. However, numerous problems have arisen during use. On the one hand, year-round cooling units can easily experience reduced cooling capacity, excessively low evaporation temperatures, and low-pressure protection, leading to operational failures when ambient temperatures are low, particularly in late autumn or winter. On the other hand, when the cooling load of process equipment fluctuates significantly with process flow, the cooling unit cannot adapt to the sudden load changes, resulting in a failure to meet the required process cooling water temperature.

[0003] Therefore, how to provide a year-round efficient cooling unit that can operate stably in any season and adapt to rapid changes in cooling load has become a technical problem that needs to be solved. Summary of the Invention

[0004] In response to the defects and shortcomings in the prior art, the present invention provides a control method for year-round cooling for a special process flow, a control device for year-round cooling for a special process flow, and a year-round cooling unit including the control device for year-round cooling for a special process flow, which ensure normal operation throughout the year, can adapt to process flows with rapid changes in cooling load, and achieve the process cooling water temperature.

[0005] As a first aspect of the present invention, a method for controlling year-round cooling for a special process flow is provided, the method comprising:

[0006] Step 101: Obtaining a current return water temperature of a year-round cooling unit, wherein the year-round cooling unit includes two compressors;

[0007] Step 102: Determine whether the current return water temperature of the year-round cooling unit meets the set temperature Ts;

[0008] Step 103: When the set temperature Ts is not met, outputting a load instruction or a load reduction instruction to adjust the operation of the compressor in the year-round cooling unit until the return water temperature of the year-round cooling unit meets the set temperature Ts;

[0009] Step 104: When the set temperature Ts is met, a hold instruction is output to stop adjusting the operating condition of the compressor in the year-round cooling unit and operate the year-round cooling unit according to the current operating condition of the compressor in the year-round cooling unit.

[0010] Furthermore, when the set temperature Ts is not met, outputting a load instruction or a load reduction instruction to adjust the operation of the compressor in the year-round cooling unit until the return water temperature of the year-round cooling unit meets the set temperature Ts, further comprising:

[0011] Step 201: Start;

[0012] Step 202: Obtain the current return water temperature of the year-round cooling unit;

[0013] Step 203: Determine whether the current return water temperature of the year-round cooling unit is greater than the set temperature Ts+ΔT1. If so, proceed to step 204; otherwise, return to step 202.

[0014] Step 204: Control the year-round cooling unit to start the cooling mode. According to the loading instruction, the compressor with the longest cumulative running time in the year-round cooling unit is started first, and the second compressor is started after an interval of S1 seconds.

[0015] Step 205: After the second compressor is started for S2 seconds, determine whether the current return water temperature of the year-round cooling unit is greater than the set temperature Ts+ΔT2; if so, return to step 203; otherwise, proceed to step 206;

[0016] Step 206: After the second compressor starts for S3 seconds, the first compressor started is turned off according to the load reduction instruction;

[0017] Step 207: Determine whether the current return water temperature of the year-round cooling unit is greater than the set temperature Ts. If so, return to step 203; otherwise, proceed to step 208.

[0018] Step 208: Turn off the second compressor;

[0019] Step 209: End.

[0020] Furthermore, the year-round cooling unit further includes a circulation fan and:

[0021] Step 301: Start;

[0022] Step 302: Obtain the current exhaust pressure P of the year-round cooling unit;

[0023] Step 303: After the cooling mode of the year-round cooling unit is turned on for S seconds, determine whether the current exhaust pressure P of the year-round cooling unit is greater than the set pressure Pd. If so, return to step 302; otherwise, proceed to step 304.

[0024] Step 304: adjusting the speed of the circulation fan according to the current exhaust pressure P of the year-round cooling unit;

[0025] Step 305: End.

[0026] As another aspect of the present invention, a control device for year-round cooling with a special process flow is provided, the control device for year-round cooling with a special process flow comprising:

[0027] an acquisition unit, configured to acquire a current return water temperature of a year-round cooling unit, wherein the year-round cooling unit includes two compressors;

[0028] a judgment unit, configured to judge whether the current return water temperature of the year-round cooling unit meets the set temperature Ts;

[0029] an adjustment unit, configured to output a load instruction or a load reduction instruction when the set temperature Ts is not met, so as to adjust the operation of the compressor in the year-round cooling unit until the return water temperature of the year-round cooling unit meets the set temperature Ts;

[0030] An operating unit is used to output a hold instruction to stop adjusting the operating condition of the compressor in the year-round cooling unit when the set temperature Ts is met, and to operate the year-round cooling unit according to the current operating condition of the compressor in the year-round cooling unit.

[0031] As another aspect of the present invention, a year-round refrigeration unit is provided, comprising a water-side heat exchanger, a first refrigeration system, a second refrigeration system and a controller, wherein the first refrigeration system and the second refrigeration system are both connected to the water-side heat exchanger, the first refrigeration system comprises a first compressor, a first air-side heat exchanger, a first electronic expansion valve and a first gas-liquid separator, the second refrigeration system comprises a second compressor, a second air-side heat exchanger, a second electronic expansion valve and a second gas-liquid separator, the controller comprises the aforementioned special process flow year-round refrigeration control device, wherein the water-side heat exchanger is respectively connected to the first gas-liquid separator and the second gas-liquid separator The first gas-liquid separator is connected to the first air-side heat exchanger through the first compressor, the first air-side heat exchanger is connected to the water-side heat exchanger through the first electronic expansion valve, the second gas-liquid separator is connected to the second air-side heat exchanger through the second compressor, the second air-side heat exchanger is connected to the water-side heat exchanger through the second electronic expansion valve, a first circulation fan and a second circulation fan are provided between the first air-side heat exchanger and the second air-side heat exchanger, and the controller is electrically connected to the first compressor, the second compressor, the first circulation fan, the second circulation fan, the first electronic expansion valve and the second electronic expansion valve respectively; wherein,

[0032] A temperature sensor is provided at the water inlet of the water-side heat exchanger, and the temperature sensor is used to detect the current return water temperature of the year-round cooling unit and upload the detected current return water temperature of the year-round cooling unit to the controller;

[0033] The controller can control the operation of the first compressor and the second compressor according to the current return water temperature of the year-round cooling unit received, and adjust the speed of the first circulation fan and the second circulation fan according to the current exhaust pressure P of the first compressor and the second compressor.

[0034] Furthermore, the first refrigeration system also includes a first pressure switch electrically connected to the controller, and the first pressure switch is arranged on the pipeline between the first compressor and the first air-side heat exchanger, and is used to control the start and stop of the first circulation fan and the second circulation fan through a set value.

[0035] Furthermore, the second refrigeration system also includes a second pressure switch electrically connected to the controller, and the second pressure switch is arranged on the pipeline between the second compressor and the second air-side heat exchanger, and is used to control the start and stop of the first circulation fan and the second circulation fan through a set value.

[0036] Furthermore, the first refrigeration system further includes a first balancing tank, which is arranged on the pipeline between the first electronic expansion valve and the water-side heat exchanger.

[0037] Furthermore, the second refrigeration system further includes a second balancing tank, which is arranged on the pipeline between the second electronic expansion valve and the water-side heat exchanger.

[0038] Furthermore, the first air-side heat exchanger and the second air-side heat exchanger are two independent units belonging to their respective refrigeration systems and have a common air circulation structure.

[0039] The control method for year-round cooling of a special process provided by the present invention has the following advantages: when the process demand for cooling load decreases rapidly, the return water temperature shows a downward trend, and by reducing the load in advance, the rate of return water temperature reduction is slowed down. On the one hand, it avoids the risk of over-adjustment of return water temperature due to small water capacity, which causes an alarm of too low evaporation temperature and even freezes the water-side heat exchanger; on the other hand, when the process demand for cooling load increases rapidly, the return water temperature rises rapidly, and the compressor needs to start working quickly. The downtime of the compressor that has been reduced in advance meets the minimum downtime of the compressor, thereby shortening the compressor response time. In addition, at low ambient temperatures, the fan speed is controlled according to the set pressure switch value, and the condensing pressure is controlled by controlling the air volume of the air-side heat exchanger, thereby improving the cooling capacity, COP and the problem of the unit failing to start of the year-round cooling unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention.

[0041] Figure 1 This is a flow chart of the control method for year-round cooling using a special process provided by the present invention.

[0042] Figure 2 This is a flow chart of a specific implementation method of the control method for year-round cooling with a special process provided by the present invention.

[0043] Figure 3 This is a flow chart of another specific implementation of the control method for year-round cooling with a special process provided by the present invention.

[0044] Figure 4 This is a structural block diagram of the control device for year-round cooling with a special process provided by the present invention.

[0045] Figure 5 This is a structural schematic diagram of the year-round cooling unit provided by the present invention.

[0046] Figure 6 This is a structural schematic diagram of the year-round cooling system provided by the present invention.

[0047] In the figure: 1-year-round cooling unit; 2-energy storage water tank; 3-cooling heat exchange device; 4-circulating water pump; 11-first compressor; 12-second compressor; 21-first pressure switch; 22-second pressure switch; 31-first air-side heat exchanger; 32-second air-side heat exchanger; 41-first circulating fan; 42-second circulating fan; 51-first electronic expansion valve; 52-second electronic expansion valve; 61-first balancing tank; 62-second balancing tank; 7-water-side heat exchanger; 81-first gas-liquid separator; 82-second gas-liquid separator. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate for the embodiments of the present invention described herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatuses.

[0051] In this embodiment, a control method for year-round cooling with a special process is provided. Figure 1 The flowchart of the control method for year-round cooling of the special process provided by the present invention is as follows: Figure 1 As shown, the control method for year-round cooling of the special process includes:

[0052] Step 101: Obtaining a current return water temperature of a year-round cooling unit, wherein the year-round cooling unit includes two compressors;

[0053] Step 102: Determine whether the current return water temperature of the year-round cooling unit meets the set temperature Ts;

[0054] It should be noted that the set temperature Ts is the temperature value that the cooling unit is expected to reach throughout the year.

[0055] Step 103: When the set temperature Ts is not met, outputting a load instruction or a load reduction instruction to adjust the operation of the compressor in the year-round cooling unit until the return water temperature of the year-round cooling unit meets the set temperature Ts;

[0056] Step 104: When the set temperature Ts is met, a hold instruction is output to stop adjusting the operating condition of the compressor in the year-round cooling unit and operate the year-round cooling unit according to the current operating condition of the compressor in the year-round cooling unit.

[0057] Preferably, if Figure 2 As shown, when the set temperature Ts is not met, a load instruction or a load reduction instruction is output to adjust the operation of the compressor in the year-round cooling unit until the return water temperature of the year-round cooling unit meets the set temperature Ts, and further includes:

[0058] Step 201: Start;

[0059] Step 202: Obtain the current return water temperature of the year-round cooling unit;

[0060] Step 203: Determine whether the current return water temperature of the year-round cooling unit is greater than the set temperature Ts+ΔT1. If so, proceed to step 204; otherwise, return to step 202.

[0061] It should be noted that △T1 is the temperature deviation value, which is used to avoid frequent start and stop of the cooling unit throughout the year.

[0062] Step 204: Control the year-round cooling unit to start the cooling mode. According to the loading instruction, the compressor with the longest cumulative running time in the year-round cooling unit is started first, and the second compressor is started after an interval of S1 seconds.

[0063] It should be noted that the interval of S1 seconds is to reduce the impact on the power grid caused by the simultaneous startup of compressors.

[0064] Step 205: After the second compressor is started for S2 seconds, determine whether the current return water temperature of the year-round cooling unit is greater than the set temperature Ts+ΔT2; if so, return to step 203; otherwise, proceed to step 206;

[0065] It should be noted that the preset time S2 seconds stipulates the minimum running time after the second compressor is started, in order to ensure that the compressor lubricating oil has sufficient time to flow back to the bottom of the compressor.

[0066] It should be noted that △T2 specifies the condition for the compressor to meet the load reduction, that is, the deviation value from the set temperature Ts; according to the regulations, △T2 is less than △T1.

[0067] Step 206: After the second compressor starts for S3 seconds, the compressor that started first is shut down according to the load reduction instruction. The purpose of shutting down the compressor that started first is to ensure that the two compressors can wear evenly.

[0068] It should be noted that the preset time S3 seconds is the cumulative running time of the second compressor after this startup. In principle, S3 should be greater than or equal to S2.

[0069] Step 207: Determine whether the current return water temperature of the year-round cooling unit is greater than the set temperature Ts. If so, return to step 203; otherwise, proceed to step 208.

[0070] Step 208: Turn off the second compressor;

[0071] Step 209: End.

[0072] Preferably, if Figure 3 As shown, the year-round cooling unit also includes a circulation fan and:

[0073] Step 301: Start;

[0074] Step 302: Obtain the current exhaust pressure P of the year-round cooling unit;

[0075] Step 303: After the cooling mode of the year-round cooling unit is turned on for S seconds, determine whether the current exhaust pressure P of the year-round cooling unit is greater than the set pressure Pd. If so, return to step 302; otherwise, proceed to step 304.

[0076] Step 304: adjusting the speed of the circulation fan according to the current exhaust pressure P of the year-round cooling unit;

[0077] Step 305: End.

[0078] The present invention provides a control method for year-round cooling in a special process flow. When the process demand for cooling load decreases rapidly, the return water temperature shows a downward trend. By reducing the load in advance, the rate of return water temperature reduction is slowed down. On the one hand, it avoids the risk of over-adjustment of return water temperature due to small water capacity, which causes an alarm of too low evaporation temperature and even freezes the water-side heat exchanger. On the other hand, when the process demand for cooling load increases rapidly, the return water temperature rises rapidly and the compressor needs to start working quickly. The downtime of the compressor that has been reduced in advance meets the minimum downtime of the compressor, thereby shortening the response time of the compressor. In addition, under low ambient temperature, the fan speed is controlled according to the set pressure switch value, and the condensing pressure is controlled by controlling the air volume of the air-side heat exchanger, thereby improving the cooling capacity, COP and the problem of the unit failing to start of the year-round cooling unit.

[0079] As another embodiment of the present invention, a control device for year-round cooling with a special process is provided. Figure 4 As shown, the control device for year-round cooling of the special process includes:

[0080] an acquisition unit, configured to acquire a current return water temperature of a year-round cooling unit, wherein the year-round cooling unit includes two compressors;

[0081] a judgment unit, configured to judge whether the current return water temperature of the year-round cooling unit meets the set temperature Ts;

[0082] an adjustment unit, configured to output a load instruction or a load reduction instruction when the set temperature Ts is not met, so as to adjust the operation of the compressor in the year-round cooling unit until the return water temperature of the year-round cooling unit meets the set temperature Ts;

[0083] An operating unit is used to output a hold instruction to stop adjusting the operating condition of the compressor in the year-round cooling unit when the set temperature Ts is met, and to operate the year-round cooling unit according to the current operating condition of the compressor in the year-round cooling unit.

[0084] The control device for year-round cooling of a special process provided by the present invention has a downward trend in the return water temperature when the process demand for cooling load decreases rapidly. By reducing the load in advance, the rate of return water temperature reduction is slowed down. On the one hand, it avoids the risk of over-adjustment of return water temperature due to small water capacity, which causes an alarm of too low evaporation temperature and even freezes the water-side heat exchanger. On the other hand, when the process demand for cooling load increases rapidly, the return water temperature rises rapidly and the compressor needs to start working quickly. The downtime of the compressor that has been reduced in advance meets the minimum downtime of the compressor, thereby shortening the response time of the compressor. In addition, at low ambient temperatures, the fan speed is controlled according to the set pressure switch value, and the condensing pressure is controlled by controlling the air volume of the air-side heat exchanger, thereby improving the cooling capacity, COP and the problem of the unit failing to start of the year-round cooling unit.

[0085] As another embodiment of the present invention, a year-round cooling unit is provided. Figure 5 As shown, it includes a water-side heat exchanger 7, a first refrigeration system, a second refrigeration system and a controller, wherein the first refrigeration system and the second refrigeration system are both connected to the water-side heat exchanger 7, the first refrigeration system includes a first compressor 11, a first air-side heat exchanger 31, a first electronic expansion valve 51 and a first gas-liquid separator 81, the second refrigeration system includes a second compressor 12, a second air-side heat exchanger 32, a second electronic expansion valve 52 and a second gas-liquid separator 82, the controller includes the control device for year-round cooling of the special process described above, wherein the water-side heat exchanger 7 is respectively connected to the first gas-liquid separator 81 and the second gas-liquid separator 82, the first gas-liquid separator 81 is connected to the first compressor 11, the first air-side heat exchanger 31, the first electronic expansion valve 51 and the first gas-liquid separator 81, the second gas-liquid separator 82 is connected to the first gas-liquid separator 81 through the first compressor 12, the second air-side heat exchanger 32, the second electronic expansion valve 52 and the second gas-liquid separator 82, the controller includes the control device for year-round cooling of the special process described above, The compressor 11 is connected to the first air-side heat exchanger 31, the first air-side heat exchanger 31 is connected to the water-side heat exchanger 7 through the first electronic expansion valve 51, the second gas-liquid separator 82 is connected to the second air-side heat exchanger 32 through the second compressor 12, the second air-side heat exchanger 32 is connected to the water-side heat exchanger 7 through the second electronic expansion valve 52, a first circulation fan 41 and a second circulation fan 42 are provided between the first air-side heat exchanger 31 and the second air-side heat exchanger 32, and the controller is electrically connected to the first compressor 11, the second compressor 12, the first circulation fan 41, the second circulation fan 42, the first electronic expansion valve 51 and the second electronic expansion valve 52 respectively; wherein,

[0086] A temperature sensor is provided at the water inlet of the water-side heat exchanger 7, and the temperature sensor is used to detect the current return water temperature of the year-round cooling unit and upload the detected current return water temperature of the year-round cooling unit to the controller;

[0087] The controller can control the operation of the first compressor 11 and the second compressor 12 according to the current return water temperature of the year-round cooling unit received, and adjust the speed of the first circulation fan 41 and the second circulation fan 42 according to the current exhaust pressure P of the first compressor 11 and the second compressor 12.

[0088] In this embodiment, Figure 5 The working principle of the year-round cooling unit shown is as follows: the high-temperature and high-pressure gaseous refrigerant discharged by the first compressor 11 and the second compressor 12 enters the first air-side heat exchanger 31 and the second air-side heat exchanger 32 respectively, the air introduced by the first circulation fan 41 and the second circulation fan 42 cools the first air-side heat exchanger 31 and the second air-side heat exchanger 32, and the high-temperature and high-pressure gaseous refrigerant passes through the first air-side heat exchanger 31 and the second air-side heat exchanger 32 respectively to become a low-temperature and high-pressure liquid refrigerant, and the low-temperature and high-pressure liquid refrigerant passes through the first air-side heat exchanger 31 and the second air-side heat exchanger 32 respectively. After throttling and reducing the pressure through the first electronic expansion valve 51 and the second electronic expansion valve 5152, a low-temperature and low-pressure gas-liquid two-phase refrigerant is formed. The low-temperature and low-pressure gas-liquid two-phase refrigerant evaporates and absorbs heat through the water-side heat exchanger 7, thereby reducing the temperature of the water in the water-side heat exchanger 7. The evaporated low-temperature and low-pressure gaseous refrigerant enters the first gas-liquid separator 81 and the second gas-liquid separator 82 respectively, and then flows back to the first compressor 11 and the second compressor 12 after gas-liquid separation through the first gas-liquid separator 81 and the second gas-liquid separator 82, thus completing a refrigeration cycle.

[0089] Preferably, the first refrigeration system also includes a first pressure switch 21 electrically connected to the controller, and the first pressure switch 21 is arranged on the pipeline between the first compressor 11 and the first air-side heat exchanger 31, and is used to control the start and stop of the first circulation fan 41 and the second circulation fan 42 through a set value.

[0090] Preferably, the second refrigeration system also includes a second pressure switch 22 electrically connected to the controller, and the second pressure switch 22 is arranged on the pipeline between the second compressor 12 and the second air-side heat exchanger 32, and is used to control the start and stop of the first circulation fan 41 and the second circulation fan 42 through a set value.

[0091] Preferably, the first refrigeration system further includes a first balancing tank 61, which is arranged on the pipeline between the first electronic expansion valve 51 and the water-side heat exchanger 7, and is used to buffer excess refrigerant generated in the refrigeration system due to changes in environmental conditions.

[0092] Preferably, the second refrigeration system further includes a second balancing tank 62, which is arranged on the pipeline between the second electronic expansion valve 52 and the water-side heat exchanger 7, and is used to buffer excess refrigerant generated in the refrigeration system due to changes in environmental conditions.

[0093] Preferably, the first air-side heat exchanger 31 and the second air-side heat exchanger 32 are two independent units belonging to their respective refrigeration systems, and have a common air circulation structure.

[0094] In this embodiment, the year-round cooling unit is a refrigeration system with two independent fluorine systems.

[0095] In this embodiment, the water-side heat exchanger 7 is a cross-parallel structure of two refrigeration systems with a common water path; the refrigerant entering the water-side heat exchanger 7 absorbs the heat of the water in the water-side heat exchanger 7, thereby reducing the temperature of the water in the water-side heat exchanger 7 and meeting the heat exchange requirements.

[0096] The year-round cooling unit provided by the present invention includes the above-mentioned special process year-round cooling control device, and therefore has the beneficial results of the special process year-round cooling control device, which will not be repeated here.

[0097] The present invention also provides a year-round cooling system, such as Figure 6 As shown, it includes the year-round refrigeration unit 1 described above for providing cold water, an energy storage water tank 2 for alleviating load fluctuations caused by an undersized system, a cooling and heat exchange device 3 for maintaining the temperature of process cooling water, and a circulating water pump 4.

[0098] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A control method for year-round cooling in a special process, characterized in that: The control method for year-round cooling of the special process includes: Step 101: Obtaining a current return water temperature of a year-round cooling unit, wherein the year-round cooling unit includes two compressors; Step 102: Determine whether the current return water temperature of the year-round cooling unit meets the set temperature Ts; Step 103: When the set temperature Ts is not met, outputting a load instruction or a load reduction instruction to adjust the operation of the compressor in the year-round cooling unit until the return water temperature of the year-round cooling unit meets the set temperature Ts; Step 104: When the set temperature Ts is met, outputting a hold instruction to stop adjusting the operating condition of the compressor in the year-round cooling unit and operating the year-round cooling unit according to the current operating condition of the compressor in the year-round cooling unit; When the set temperature Ts is not met, outputting a load instruction or a load reduction instruction to adjust the operation of the compressor in the year-round cooling unit until the return water temperature of the year-round cooling unit meets the set temperature Ts, further comprising: Step 201: Start; Step 202: Obtain the current return water temperature of the year-round cooling unit; Step 203: Determine whether the current return water temperature of the year-round cooling unit is greater than the set temperature Ts+ΔT1. If so, proceed to step 204; otherwise, return to step 202. Among them, △T1 is the temperature deviation value, which is used to avoid frequent start and stop of the cooling unit throughout the year; Step 204: Control the year-round cooling unit to start the cooling mode. According to the loading instruction, the compressor with the longest cumulative running time in the year-round cooling unit is started first, and the second compressor is started after an interval of S1 seconds. Step 205: After the second compressor is started for S2 seconds, determine whether the current return water temperature of the year-round cooling unit is greater than the set temperature Ts+ΔT2; if so, return to step 203; otherwise, proceed to step 206; Among them, △T2 stipulates the condition for the compressor to meet the load reduction, that is, the deviation value from the set temperature Ts; △T2 is less than △T1; Step 206: After the second compressor starts for S3 seconds, the first compressor started is turned off according to the load reduction instruction; Step 207: Determine whether the current return water temperature of the year-round cooling unit is greater than the set temperature Ts. If so, return to step 203; otherwise, proceed to step 208. Step 208: Turn off the second compressor; Step 209: End.

2. The control method for year-round cooling of a special process according to claim 1, wherein the year-round cooling unit further comprises a circulating fan, characterized in that: Also includes: Step 301: Start; Step 302: Obtain the current exhaust pressure P of the year-round cooling unit; Step 303: After the cooling mode of the year-round cooling unit is turned on for S seconds, determine whether the current exhaust pressure P of the year-round cooling unit is greater than the set pressure Pd. If so, return to step 302; otherwise, proceed to step 304. Step 304: adjusting the speed of the circulation fan according to the current exhaust pressure P of the year-round cooling unit; Step 305: End.

Images