Evaporative cold refrigeration system exhaust pressure too high fault judgment method and evaporative cold refrigeration system

Abstract

The application discloses a kind of evaporative cold refrigeration system exhaust pressure excessively high fault judgment method, comprising: step 1000, the pressure P and temperature T1 of the air in evaporative condenser after completing heat exchange with water through filler are obtained, the temperature T2 of water in evaporative condenser after heat exchange with heat exchange pipe is obtained before entering filler, the temperature difference ΔT of water in evaporative condenser after heat exchange with heat exchange pipe is obtained before entering filler and after output from filler;Step 2000, according to the result of the obtained P, T1, T2 and ΔT judges the fault reason of evaporative cold refrigeration system exhaust pressure excessively high.

Description

Technical Field

[0001] This invention relates to the field of refrigeration system technology, and in particular to a fault diagnosis method for excessively high exhaust pressure in an evaporative refrigeration system and an evaporative refrigeration system. Background Technology

[0002] Evaporative cooling systems are refrigeration systems that include an evaporative condenser. The evaporative condenser comprises a fan, a spray system, packing material, a water collection container, a water pump, and heat exchange tubes for passing refrigerant and cooling it. During operation, the water pump draws water from the collection container and sends it to the spray system. The spray system sprays water onto the heat exchange tubes, where it exchanges heat with the refrigerant. Some of the sprayed water vaporizes and is carried away by the air introduced by the fan, while some water, after exchanging heat with the heat exchange tubes, enters the packing material, is cooled by the flowing air, and then flows out of the packing material and into the water collection container. Evaporative cooling systems are widely used, for example, in modern building and industrial cooling systems where evaporative chillers are used to cool circulating cooling water. A common problem in evaporative cooling systems is excessively high compressor discharge pressure. When this occurs, rapid troubleshooting is crucial for optimizing system design, improving energy efficiency, and ensuring stable equipment operation. Summary of the Invention

[0003] The purpose of this invention is to provide a fault diagnosis method for excessively high exhaust pressure in an evaporative refrigeration system that helps to quickly troubleshoot the problem, and an evaporative refrigeration system that can apply this fault diagnosis method.

[0004] The first aspect of this invention discloses a fault diagnosis method for excessively high exhaust pressure in an evaporative cooling system, comprising:

[0005] Step 1000: Obtain the pressure P and temperature T1 of the air in the evaporative condenser after heat exchange with the water that has passed through the packing; obtain the temperature T2 of the water in the evaporative condenser after heat exchange with the heat exchange tube before entering the packing; obtain the temperature difference ΔT between the water in the evaporative condenser after heat exchange with the heat exchange tube before entering the packing and after exiting the packing.

[0006] Step 2000: Determine the cause of the fault of excessively high exhaust pressure in the evaporative cooling system based on the obtained P, T1, T2 and ΔT results.

[0007] In some embodiments, step 2000 includes: when the value of P is less than P0, determining whether the value of T1 is greater than T10, and determining the cause of the fault of excessive exhaust pressure in the evaporative cooling system based on the determination result.

[0008] Wherein, P0 is the minimum critical pressure of the air in the evaporative condenser after heat exchange with the water passing through the packing material during normal operation of the evaporative refrigeration system, and T10 is the minimum critical temperature of the air in the evaporative condenser after heat exchange with the water passing through the packing material during normal operation of the evaporative refrigeration system.

[0009] In some embodiments, step 2000 further includes: when the value of P is less than P0, determining whether the value of T1 is greater than T10; if the determination result is yes, then step 2210 is executed.

[0010] Step 2210 includes: increasing the operating frequency of the evaporative condenser fan, and then determining whether the exhaust pressure of the evaporative cooling system has decreased. If the exhaust pressure of the evaporative cooling system has not decreased, the cause of the excessive exhaust pressure of the evaporative cooling system is determined to be a fault in the evaporative condenser fan.

[0011] In some embodiments, step 2000 includes: when the value of P is greater than P0, determining whether the value of T2 is greater than T21, and determining the cause of the fault of excessive exhaust pressure in the evaporative cooling system based on the determination result.

[0012] Wherein, P0 is the minimum critical pressure of the air in the evaporative condenser after heat exchange with the water passing through the packing material during normal operation of the evaporative refrigeration system, and T21 is the maximum critical temperature of the water in the evaporative condenser after heat exchange with the heat exchange tubes before entering the packing material during normal operation of the evaporative refrigeration system.

[0013] In some embodiments, step 2000 includes:

[0014] When the value of P is greater than P0, determine whether the value of T2 is greater than T21. If the result is yes, then execute step 2110.

[0015] Step 2110 includes: determining whether the value of ΔT is greater than ΔT0, and determining the cause of the fault of excessive exhaust pressure in the evaporative cooling system based on the determination result. ΔT0 is the minimum critical value of the temperature difference between the water in the evaporative condenser after heat exchange with the heat exchange tube before entering the packing and after exiting the packing when the evaporative cooling system is operating normally.

[0016] In some embodiments, step 2110 includes: determining whether the value of ΔT is greater than ΔT0; if the determination result is yes, then step 2111 is executed.

[0017] Step 2111 includes: increasing the operating frequency of the cooling water pump of the evaporative condenser used to draw water from the water collection container and pump circulating water, and then determining whether the exhaust pressure of the evaporative cooling system has decreased. If it is determined that the exhaust pressure of the evaporative cooling system has not decreased, then the cause of the fault of excessive exhaust pressure of the evaporative cooling system is that the water collection container of the evaporative condenser is short of water.

[0018] In some embodiments, step 2110 includes: determining whether the value of ΔT is greater than ΔT0; if the determination result is no, then step 2112 is executed.

[0019] Step 2112 includes: reducing the operating frequency of the compressor in the evaporative cooling system, and then determining whether the discharge pressure of the evaporative cooling system has decreased. If the discharge pressure of the evaporative cooling system has not decreased, the cause of the fault of excessive discharge pressure in the evaporative cooling system is determined to be that the packing of the evaporative condenser is dirty and clogged.

[0020] In some embodiments, step 2000 includes: when the value of P is greater than P0, determining whether the value of T2 is greater than T21; if the determination result is no, then step 2120 is executed.

[0021] Step 2120 includes: determining whether the value of ΔT is greater than ΔT0. If the determination result is no, the cause of the fault of excessive exhaust pressure of the evaporative cooling system is determined to be scaling of the heat exchange tube. ΔT0 is the minimum critical value of the temperature difference between the water in the evaporative condenser after heat exchange with the heat exchange tube before entering the packing and after exiting the packing when the evaporative cooling system is running normally.

[0022] The second aspect of this invention discloses an evaporative refrigeration system that utilizes any of the described methods for determining excessively high exhaust pressure in an evaporative refrigeration system, comprising:

[0023] A refrigeration cycle system includes a compressor, an evaporative condenser, an expansion valve, and an evaporator connected in series.

[0024] The detection device includes a pressure sensor and a first temperature sensor for detecting the pressure P and temperature T1 of the air after heat exchange with the water passing through the packing in the evaporative condenser. The detection device also includes a second temperature sensor for detecting the temperature T2 of the water after heat exchange with the heat exchange tube in the evaporative condenser before entering the packing and a third temperature sensor for detecting the temperature T3 after exiting the packing.

[0025] In some embodiments, when the evaporative condenser is in operation, the fan of the evaporative condenser causes the air entering the evaporative condenser to flow in the direction from the outlet of the packing to the inlet of the packing, and the pressure detection sensor and the first temperature detection sensor are arranged between the heat exchange tube and the packing.

[0026] Based on the fault diagnosis method for excessively high exhaust pressure in evaporative cooling systems provided by this invention, by obtaining the pressure P and temperature T1 of the air in the evaporative condenser after heat exchange with the water passing through the packing, obtaining the temperature T2 of the water in the evaporative condenser after heat exchange with the heat exchange tubes before entering the packing, and obtaining the temperature difference ΔT between the water in the evaporative condenser after heat exchange with the heat exchange tubes before entering the packing and after exiting the packing, some common fault causes of excessively high exhaust pressure in evaporative cooling systems can be quickly determined based on the obtained P, T1, T2 and ΔT results.

[0027] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0029] Figure 1 This is a schematic diagram illustrating the structural principle of the evaporative cooling system according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the evaporative condenser in the evaporative cooling system according to an embodiment of the present invention;

[0031] Figure 3 This is a flowchart of a fault diagnosis method for an evaporative cooling system with excessively high exhaust pressure, according to an embodiment of the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] In the description of this invention, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] When an evaporative cooling system is operating, the compressor 4 compresses the refrigerant to a high temperature and pressure. There are many reasons why the compressor 4 might experience excessively high discharge pressure. Some common causes include fan 11 malfunction, insufficient water in the water collection container 15, clogged packing 14, and scale buildup on the heat exchange tubes 13. When fan 11 malfunctions, it cannot operate normally and cannot provide sufficient airflow to the evaporative condenser 1. This results in poor cooling of the refrigerant in the evaporative condenser 1, preventing the refrigerant from cooling down properly. Consequently, the refrigerant remains at a high temperature when exiting the evaporative condenser 1, eventually circulating to and from the compressor 4, leading to excessively high discharge pressure. When the water collection container 15 is short of water, the water pump cannot draw enough water from it to send to the spray device 12. Consequently, the spray device 12 sprays insufficient water onto the heat exchange tubes 13, resulting in poor heat exchange with the tubes and preventing the refrigerant from cooling properly. This causes the refrigerant to remain at a high temperature when exiting the evaporative condenser 1, leading to excessively high discharge pressure after circulating to and from the compressor 4. The packing 14 of the evaporative condenser 1 refers to the device that increases the heat exchange area and improves the heat exchange efficiency within the evaporative condenser 1. The packing 14 can be made of porous materials such as plastics, ceramics, and metals, and comes in various shapes, including plates, rings, and spheres. These packings 14 increase the gas-liquid contact area and accelerate heat transfer by dispersing the incoming fluid into many small droplets or bubbles. When the packing 14 is clogged, the heat exchange channel is blocked, and the heat exchange efficiency drops significantly. This results in a significant decrease in the cooling effect of the water entering the packing 14 by the air introduced by the fan 11, causing the temperature of the water entering the water collection container 15 to not drop effectively. Consequently, when the water is pumped into the spray device 12 and sprayed from the spray device 12 onto the heat exchange tube 13, the high water temperature makes it difficult to achieve a good heat exchange effect with the refrigerant in the heat exchange tube 13. This prevents the refrigerant from cooling down properly, causing it to remain at a high temperature when it exits the evaporative condenser 1. Finally, the refrigerant circulates to the compressor 4, and the discharge pressure from the compressor 4 is too high. When the heat exchange tube 13 is scaled, the efficiency of direct heat exchange between the water sprayed from the spray device 12 onto the heat exchange tube 13 and the refrigerant in the heat exchange tube 13 decreases, preventing the refrigerant from cooling down properly. This causes the refrigerant to remain at a high temperature when it exits the evaporative condenser 1, and the discharge pressure from the compressor 4 is too high. The purpose of this application is to provide methods for determining some common causes of exhaust pressure failure.

[0038] The fault diagnosis method for excessively high discharge pressure in the evaporative refrigeration system of this embodiment includes steps 1000 and 2000. When an excessively high discharge pressure is observed in the evaporative refrigeration system, for example, a pressure sensor is installed on the pipeline between the compressor 4 and the evaporative condenser 1. When the pressure sensor detects that the refrigerant pressure exceeds the normal range, the fault of excessively high discharge pressure is diagnosed.

[0039] Step 1000: Obtain the pressure P and temperature T1 of the air in the evaporative condenser 1 after heat exchange with the water passing through the packing 14, i.e., obtain the pressure and temperature of the air introduced into the evaporative condenser 1 by the fan 11 after cooling the water passing through the packing 14. Obtain the temperature T2 of the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 before entering the packing 14, i.e., the temperature T2 of the water before entering the packing 14 and before being cooled by air in the packing 14 after heat exchange with the refrigerant in the heat exchange tube 13. Obtain the temperature difference ΔT between the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 before entering the packing 14 and after exiting the packing 14, i.e., obtain the temperature ΔT of the water cooled by the air introduced by the fan 11 in the packing 14.

[0040] Step 2000: Determine the cause of excessively high exhaust pressure in the evaporative cooling system based on the obtained P, T1, T2, and ΔT results. Based on the above data, common causes of malfunctions such as fan 11 failure, water shortage in the water collection container 15, blockage of the packing 14, and scaling on the heat exchange tube 13 can be identified.

[0041] The step numbers in this application (e.g., steps 1000 and 2000 above) do not specify the order of execution. Whether there is a logical order between steps can be determined based on the text content. If there is a logical requirement for the execution order of the steps, then it is understood that they should be executed in that order. If it is logically determined that they can be executed out of order, then there is no order between the steps. Furthermore, if the description of multiple actions within a step does not explicitly indicate the order, then there is no restriction on the execution order of the actions.

[0042] The fault diagnosis method for excessively high exhaust pressure in the evaporative cooling system of this embodiment obtains the pressure P and temperature T1 of the air in the evaporative condenser 1 after heat exchange with the water passing through the packing 14, the temperature T2 of the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 before entering the packing 14, and the temperature difference ΔT between the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 before entering the packing 14 and after exiting the packing 14. Based on the obtained P, T1, T2 and ΔT results, some common fault causes of excessively high exhaust pressure in the evaporative cooling system can be quickly determined.

[0043] In some embodiments, step 2000 includes: when the value of P is less than P0, determining whether the value of T1 is greater than T10, and determining the cause of the fault of excessive exhaust pressure in the evaporative cooling system based on the determination result.

[0044] Wherein, P0 is the minimum critical pressure of the air in the evaporative condenser 1 after heat exchange with the water in the packing 14 during normal operation of the evaporative refrigeration system, and T10 is the minimum critical temperature of the air in the evaporative condenser 1 after heat exchange with the water in the packing 14 during normal operation of the evaporative refrigeration system. During normal operation of the evaporative refrigeration system, the air introduced by the fan 11 is heated and its temperature rises after passing through the packing 14 and exchanging heat with the water in the packing 14, resulting in an increase in both air pressure and temperature. When the evaporative refrigeration system is operating normally, the discharge pressure of the compressor 4 is within the normal range, and the flow rate of the air entering the evaporative condenser 1 will be greater than the minimum flow rate required to meet the heat exchange needs with the water in the packing 14. After normal heat exchange with the water in the packing 14, the pressure of the air passing through the packing 14 will rise above the minimum critical value. In this embodiment, when a fault of excessively high exhaust pressure occurs, if the obtained value of P is less than P0 and the value of T1 is greater than T10, it is determined that the air flow rate entering the evaporative condenser 1 is abnormal, lower than the minimum required flow rate, and it is highly likely that the fan 11 is malfunctioning. If the obtained value of P is less than P0 and the value of T1 is less than T10, the air flow rate entering the evaporative condenser 1 may be lower than the minimum required flow rate, or the air flow rate may be greater than the minimum flow rate. The heat absorbed by the air during heat exchange with water in the packing 14 is low, making the cause of the excessively high exhaust pressure fault more complex and requiring further clarification.

[0045] In some embodiments, step 2000 further includes: when the value of P is less than P0, determining whether the value of T1 is greater than T10; if the determination result is yes, then step 2210 is executed.

[0046] Step 2210 includes: increasing the operating frequency of the fan 11 of the evaporative condenser 1, and then determining whether the exhaust pressure of the evaporative cooling system decreases. If the exhaust pressure of the evaporative cooling system does not decrease, the cause of the excessively high exhaust pressure is determined to be a malfunction of the fan 11 of the evaporative condenser 1. In this embodiment, the value of P is less than P0, and the value of T1 is greater than T10, indicating that the airflow entering the evaporative condenser 1 is abnormal and lower than the minimum required flow rate. When increasing the operating frequency of the fan 11 does not decrease the exhaust pressure of the evaporative cooling system, it indicates that increasing the operating frequency of the fan 11 cannot increase the airflow entering the evaporative condenser 1, and the cause of the excessively high exhaust pressure is determined to be a malfunction of the fan 11. When increasing the operating frequency of the fan 11 decreases the exhaust pressure of the evaporative cooling system, it indicates that increasing the operating frequency of the fan 11 can increase the airflow entering the evaporative condenser 1. Therefore, the reason why the airflow entering the evaporative condenser 1 is lower than the minimum flow rate may be due to complex reasons such as control system errors, which need further clarification.

[0047] In some embodiments, step 2000 includes: when the value of P is greater than P0, determining whether the value of T2 is greater than T21, and determining the cause of the fault of excessive exhaust pressure in the evaporative cooling system based on the determination result.

[0048] Wherein, P0 is the minimum critical pressure of the air in the evaporative condenser 1 after heat exchange with the water in the packing 14 during normal operation of the evaporative refrigeration system, and T21 is the maximum critical temperature of the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 before entering the packing 14 during normal operation of the evaporative refrigeration system. During normal operation of the evaporative refrigeration system, the water sprayed from the spray device 12 exchanges heat with the refrigerant on the heat exchange tube 13, causing the water temperature to rise, and then enters the packing 14 to exchange heat with the air. When the evaporative refrigeration system is operating normally, the compressor 4 discharge pressure is within the normal range. The water, after being normally cooled by the air in the packing 14, is pumped to the spray device 12 and sprayed out. The amount of water sprayed is sufficient to exchange heat normally with the refrigerant in the heat exchange tube 13, allowing the evaporative condenser 1 to operate normally. The temperature of the water after heat exchange will not exceed the upper limit of the normal temperature range, that is, it will not exceed the maximum critical temperature T21 of the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 before entering the packing 14 during normal operation of the evaporative refrigeration system. In this embodiment, when a fault of excessive exhaust pressure occurs, if the value of P obtained is greater than P0 and the value of T2 is greater than T21, and the temperature of the water after heat exchange is too high, it can be determined that the amount of water sprayed by the spray device 12 that exchanges heat with the heat exchange tube 13 is insufficient, or the water temperature sprayed by the spray device 12 is too high. Therefore, it can be determined that the temperature of the water after heat exchange is too high, and it is highly likely that the water collection container 15 is short of water or the packing 14 is dirty and clogged.

[0049] In some embodiments, step 2000 includes:

[0050] When the value of P is greater than P0, determine whether the value of T2 is greater than T21. If the result is yes, then execute step 2110.

[0051] Step 2110 includes: determining whether the value of ΔT is greater than ΔT0, and determining the cause of the fault of excessive exhaust pressure in the evaporative cooling system based on the determination result. Here, ΔT0 is the minimum critical temperature difference between the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 before entering the packing 14 and after exiting the packing 14 during normal operation of the evaporative cooling system. During normal operation of the evaporative cooling system, the water sprayed from the spray device 12 exchanges heat with the refrigerant on the heat exchange tube 13 and then enters the packing 14 to exchange heat with the air. When the evaporative cooling system is operating normally, the temperature drop of the water after being normally cooled by the air through the packing 14 will exceed the lower limit of the normal temperature drop, that is, it will not be lower than the minimum critical temperature difference between the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 before entering the packing 14 and after exiting the packing 14. When a fault of excessively high exhaust pressure occurs, if the obtained value of P is greater than P0, and the value of T2 is greater than T21, it is highly likely that the water collection container 15 is short of water or the packing 14 is clogged. Further, if the value of ΔT is greater than ΔT0, it indicates that the air at the packing 14 is able to cool the water normally, thus indicating that the water collection container 15 is likely short of water. If the value of ΔT is less than ΔT0, it is highly likely that the packing 14 is clogged. This embodiment, by further determining whether the value of ΔT is greater than ΔT0, can further determine whether the fault is more likely due to a lack of water in the water collection container 15 or a clogged packing 14.

[0052] In some embodiments, step 2110 includes: determining whether the value of ΔT is greater than ΔT0; if the determination result is yes, then step 2111 is executed.

[0053] Step 2111 includes: increasing the operating frequency of the cooling water pump 16 of the evaporative condenser 1, which is used to draw water from the water collection container 15 and pump circulating water; then determining whether the exhaust pressure of the evaporative cooling system has decreased. If the exhaust pressure of the evaporative cooling system has not decreased, the cause of the high exhaust pressure is determined to be a lack of water in the water collection container 15 of the evaporative condenser 1. In this embodiment, when a high exhaust pressure fault occurs, if the obtained value of P is greater than P0, and the value of T2 is greater than T21, and the value of ΔT is greater than ΔT0, then it is highly likely that the water collection container 15 is short of water. When the operating frequency of the cooling water pump 16 of the evaporative condenser 1, which is used to draw water from the water collection container 15 and pump circulating water, is increased, the exhaust pressure of the evaporative cooling system does not decrease, indicating that increasing the frequency of the cooling water pump 16 cannot increase the amount of water sprayed by the spray device 12. Therefore, the cause of the high exhaust pressure fault is determined to be a lack of water in the water collection container 15. In some embodiments, the water collection container 15 is a water receiving tray. When the operating frequency of the cooling water pump 16 of the evaporative condenser 1, which is used to draw water from the water collection container 15 and pump circulating water, is increased, the exhaust pressure of the evaporative refrigeration system decreases. This indicates that increasing the operating frequency of the cooling water pump 16 can increase the amount of water sprayed by the spray device 12, which means that the water collection container 15 is not short of water. The reason for the low amount of water sprayed by the spray device 12 may be due to complex reasons such as control system errors, which need to be further clarified.

[0054] In some embodiments, step 2110 includes: determining whether the value of ΔT is greater than ΔT0; if the determination result is no, then step 2112 is executed.

[0055] Step 2112 includes: reducing the operating frequency of the compressor 4 in the evaporative cooling system, and then determining whether the discharge pressure of the evaporative cooling system decreases. If the discharge pressure does not decrease, the cause of the excessively high discharge pressure is determined to be blockage of the packing 14 in the evaporative condenser 1. If the obtained value of P is greater than P0, and the value of T2 is greater than T21, and the value of ΔT is less than ΔT0, then the possibility of blockage of the packing 14 is high. If reducing the operating frequency of the compressor 4 in the evaporative cooling system does not decrease the discharge pressure, then the cause of the excessively high discharge pressure is determined to be blockage of the packing 14. If reducing the operating frequency of the compressor 4 in the evaporative cooling system does decrease the discharge pressure, it indicates that the cause of the excessively high discharge pressure may be a complex issue such as insufficient airflow or blockage in the refrigerant flow pipeline causing excessive heat in the heat source, requiring further clarification.

[0056] In some embodiments, step 2000 includes: when the value of P is greater than P0, determining whether the value of T2 is greater than T21; if the determination result is no, then step 2120 is executed.

[0057] Step 2120 includes: determining whether the value of ΔT is greater than ΔT0. If the determination result is no, the cause of the high exhaust pressure of the evaporative cooling system is determined to be scaling of the heat exchange tube 13. Here, ΔT0 is the minimum critical value of the temperature difference between the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 before entering the packing 14 and after exiting the packing 14 during normal operation of the evaporative cooling system. If the obtained value of P is greater than P0, and the value of T2 is less than T21, then the temperature of the water in the evaporative condenser 1 after heat exchange with the heat exchange tube 13 is less than the maximum critical value T21, indicating that the water volume of the spray water is normal and the air can effectively cool the water in the packing 14. At the same time, since the value of ΔT is less than ΔT0, it indicates that the temperature of the water after heat exchange with the heat exchange tube 13 is too low, and the heat exchange efficiency of the spray water with the heat exchange tube 13 is very poor. This embodiment can thus determine that the cause of the high exhaust pressure is scaling of the heat exchange tube 13.

[0058] In some embodiments, an evaporative refrigeration system applying any of the above-described methods for determining excessively high exhaust pressure in an evaporative refrigeration system is also disclosed, comprising:

[0059] The refrigeration cycle system includes a compressor 4, an evaporative condenser 1, an expansion valve 2, and an evaporator 3 connected in series.

[0060] The detection device includes a pressure sensor 174 and a first temperature sensor 173 for detecting the pressure P and temperature T1 of the air after heat exchange with the water passing through the packing 14 in the evaporative condenser 1. The device also includes a second temperature sensor 171 for detecting the temperature T2 of the water after heat exchange with the heat exchange tube 13 in the evaporative condenser 1 before entering the packing 14, and a third temperature sensor 172 for detecting the temperature T3 after exiting the packing 14. By detecting T2 and T3, the temperature ΔT at which the air introduced by the fan 11 cools the water in the packing 14, causing the water temperature to drop, can be obtained.

[0061] In some embodiments, such as Figure 1 As shown, when the evaporative condenser 1 is working, the fan 11 of the evaporative condenser 1 causes the air entering the evaporative condenser 1 to flow along the direction from the outlet of the packing 14 to the inlet of the packing 14. The pressure sensor 174 and the first temperature sensor 173 are arranged between the heat exchange tube 13 and the packing 14. This arrangement in this embodiment can effectively obtain the pressure P and temperature T1 of the air inside the evaporative condenser 1 after heat exchange with the water passing through the packing 14. Figure 2In the embodiment shown, the amount of water flowing down from the heat exchange tube is not large and will not fill the space between the heat exchange tube and the packing. Therefore, the first temperature detection sensor 173 is arranged between the heat exchange tube 13 and the packing 14, which can avoid the flow path of the water flowing down from the heat exchange tube and can accurately detect the temperature T1 of the air after heat exchange with the water passing through the packing 14.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for diagnosing faults in an evaporative cooling system with excessively high exhaust pressure, characterized in that, include: Step 1000: Obtain the pressure P and temperature T1 of the air in the evaporative condenser (1) after heat exchange with the water through the packing (14); obtain the temperature T2 of the water in the evaporative condenser (1) after heat exchange with the heat exchange tube (13) before entering the packing (14); obtain the temperature difference ΔT between the water in the evaporative condenser (1) after heat exchange with the heat exchange tube (13) before entering the packing (14) and after exiting the packing (14). Step 2000: Based on the obtained P, T1, T2 and ΔT results, determine the cause of the evaporative cooling system exhaust pressure being too high. The cause of the malfunction includes at least one of the following: fan (11) failure of the evaporative condenser (1), water shortage in the water collection container (15), dirt blockage of the packing (14) and scaling of the heat exchange tube (13).

2. The fault diagnosis method for excessively high exhaust pressure in an evaporative cooling system as described in claim 1, characterized in that, Step 2000 includes: when the value of P is less than P0, determining whether the value of T1 is greater than T10, and determining the cause of the fault of excessive exhaust pressure in the evaporative cooling system based on the determination result. Wherein, P0 is the minimum critical pressure of the air in the evaporative condenser (1) after heat exchange with the water through the packing (14) when the evaporative refrigeration system is operating normally, and T10 is the minimum critical temperature of the air in the evaporative condenser (1) after heat exchange with the water through the packing (14) when the evaporative refrigeration system is operating normally.

3. The fault diagnosis method for excessively high exhaust pressure in an evaporative cooling system as described in claim 2, characterized in that, Step 2000 further includes: when the value of P is less than P0, determine whether the value of T1 is greater than T10; if the determination result is yes, then execute step 2210. Step 2210 includes: increasing the operating frequency of the fan (11) of the evaporative condenser (1), and then determining whether the exhaust pressure of the evaporative cooling system has decreased. If the exhaust pressure of the evaporative cooling system has not decreased, the cause of the fault of the excessive exhaust pressure of the evaporative cooling system is determined to be a fault of the fan (11) of the evaporative condenser (1).

4. The fault diagnosis method for excessively high exhaust pressure in an evaporative cooling system as described in claim 1, characterized in that, Step 2000 includes: when the value of P is greater than P0, determining whether the value of T2 is greater than T21, and determining the cause of the fault of excessive exhaust pressure in the evaporative cooling system based on the determination result. Wherein, P0 is the minimum critical pressure of the air in the evaporative condenser (1) after heat exchange with the water through the packing (14) when the evaporative refrigeration system is operating normally, and T21 is the maximum critical temperature of the water in the evaporative condenser (1) after heat exchange with the heat exchange tube (13) before entering the packing (14) when the evaporative refrigeration system is operating normally.

5. The fault diagnosis method for excessively high exhaust pressure in an evaporative cooling system as described in claim 4, characterized in that, Step 2000 includes: When the value of P is greater than P0, determine whether the value of T2 is greater than T21. If the result is yes, then execute step 2110. Step 2110 includes: determining whether the value of ΔT is greater than ΔT0, and determining the cause of the fault of excessive exhaust pressure of the evaporative cooling system based on the determination result. ΔT0 is the minimum critical value of the temperature difference between the water in the evaporative condenser (1) after heat exchange with the heat exchange tube (13) before entering the packing (14) and after being output from the packing (14) when the evaporative cooling system is running normally.

6. The fault diagnosis method for excessively high exhaust pressure in an evaporative cooling system as described in claim 5, characterized in that, Step 2110 includes: determining whether the value of ΔT is greater than ΔT0; if the determination result is yes, then step 2111 is executed. Step 2111 includes: increasing the operating frequency of the cooling water pump (16) of the evaporative condenser (1) for drawing water from the water collection container (15) and pumping circulating water, and then determining whether the exhaust pressure of the evaporative cooling system has decreased. If it is determined that the exhaust pressure of the evaporative cooling system has not decreased, then it is determined that the cause of the fault of the excessive exhaust pressure of the evaporative cooling system is that the water collection container (15) of the evaporative condenser (1) is short of water.

7. The fault diagnosis method for excessively high exhaust pressure in an evaporative cooling system as described in claim 5, characterized in that, Step 2110 includes: determining whether the value of ΔT is greater than ΔT0; if the determination result is no, then step 2112 is executed. Step 2112 includes: reducing the operating frequency of the compressor (4) of the evaporative cooling system, and then determining whether the exhaust pressure of the evaporative cooling system has decreased. If the exhaust pressure of the evaporative cooling system has not decreased, the cause of the fault of excessive exhaust pressure of the evaporative cooling system is that the packing (14) of the evaporative condenser (1) is dirty and clogged.

8. The fault diagnosis method for excessively high exhaust pressure in an evaporative cooling system as described in claim 4, characterized in that, Step 2000 includes: when the value of P is greater than P0, determine whether the value of T2 is greater than T21; if the determination result is no, then execute step 2120. Step 2120 includes: determining whether the value of ΔT is greater than ΔT0. If the determination result is no, the cause of the fault of excessive exhaust pressure of the evaporative cooling system is scale buildup in the heat exchange tube (13). ΔT0 is the minimum critical value of the temperature difference between the water in the evaporative condenser (1) after heat exchange with the heat exchange tube (13) before entering the packing (14) and after being output from the packing (14) when the evaporative cooling system is running normally.

9. An evaporative refrigeration system employing the fault diagnosis method for excessively high exhaust pressure in an evaporative refrigeration system as described in any one of claims 1 to 8, characterized in that, include: The refrigeration cycle system includes a compressor (4), an evaporative condenser (1), an expansion valve (2), and an evaporator (3) connected in series. The detection device includes a pressure sensor and a first temperature sensor (173) for detecting the pressure P and temperature T1 of the air in the evaporative condenser (1) after heat exchange with the water through the packing (14). The detection device also includes a second temperature sensor (171) for detecting the temperature T2 of the water in the evaporative condenser (1) after heat exchange with the heat exchange tube (13) before entering the packing (14) and a third temperature sensor (172) for detecting the temperature T3 of the water after exiting the packing (14).

10. The evaporative cooling system as described in claim 9, characterized in that, When the evaporative condenser (1) is working, the fan (11) of the evaporative condenser (1) causes the air entering the evaporative condenser (1) to flow in the direction from the outlet of the packing (14) to the inlet of the packing (14). The pressure detection sensor and the first temperature detection sensor (173) are arranged between the heat exchange tube (13) and the packing (14).

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