Fault judgment method for overhigh exhaust pressure of evaporative cooling refrigeration system and evaporative cooling refrigeration system

Abstract

The invention discloses a fault judgment method for overhigh exhaust pressure of an evaporative cooling refrigeration system, which comprises the following steps: step 1000, acquiring the pressure P and the temperature T1 of air in an evaporative condenser after heat exchange with water passing through a filler, acquiring the temperature T2 of water in the evaporative condenser after heat exchange with a heat exchange tube before entering the filler, the temperature difference delta T between the water, subjected to heat exchange with the heat exchange pipe, in the evaporative condenser before entering the filler and after being output from the filler is obtained; and 2000, according to the obtained results of the P, the T1, the T2 and the delta T, the fault reason of the overhigh exhaust pressure of the evaporative cooling refrigeration system is judged.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration systems, and in particular to a fault judgment method for excessively high exhaust pressure of an evaporative cooling refrigeration system and an evaporative cooling refrigeration system. Background Art

[0002] The evaporative cooling system is a refrigeration system including an evaporative condenser. The evaporative condenser includes a fan, a spray device, a filler, a water collection container, a water pump, and a heat exchange tube for passing the refrigerant and exchanging heat with the refrigerant. When working, the water pump draws water from the water collection container to the spray device, and the spray device sprays water onto the heat exchange tube to exchange heat with the refrigerant in the heat exchange tube. Part of the sprayed water vaporizes and is taken away by the wind introduced by the fan. Part of the water enters the filler after heat exchange with the heat exchange tube, and flows out of the filler after being cooled by the flowing wind, and then enters the water collection container. The evaporative cooling system is widely used, for example, in evaporative cooling chillers in modern buildings and industrial cooling systems to cool circulating cooling water. When the evaporative cooling system is working, the failure of the compressor to have excessive exhaust pressure is a common problem of the system. When this problem occurs, rapid troubleshooting is of great significance for optimizing system design, improving energy efficiency and ensuring stable operation of equipment. Summary of the invention

[0003] The object of the present invention is to provide a fault judgment method for excessively high exhaust pressure of an evaporative cooling refrigeration system which is helpful for quickly eliminating the fault and an evaporative cooling refrigeration system to which the fault judgment method can be applied.

[0004] The first aspect of the present invention discloses a method for judging a fault of excessive exhaust pressure in an evaporative refrigeration system, comprising:

[0005] Step 1000, obtaining the pressure P and temperature T1 of the air in the evaporative condenser after completing heat exchange with the water passing through the packing, obtaining the temperature T2 of the water in the evaporative condenser before entering the packing after heat exchange with the heat exchange tube, and obtaining the temperature difference ΔT between the water in the evaporative condenser before entering the packing and after being output from the packing after heat exchange with the heat exchange tube;

[0006] Step 2000, judging the fault cause of the exhaust pressure of the evaporative cooling system being too high according to the obtained results of P, T1, T2 and ΔT.

[0007] In some embodiments, the step 2000 includes: when the acquired value of P is less than P0, determining whether the value of T1 is greater than T10, and determining the fault cause of the excessively high exhaust pressure of the evaporative cooling system according to the determination result;

[0008] Among them, P0 is the minimum critical value of the pressure of the air in the evaporative condenser after completing the heat exchange with the water passing through the packing when the evaporative cooling system is operating normally, and T10 is the minimum critical value of the temperature of the air in the evaporative condenser after completing the heat exchange with the water passing through the packing when the evaporative cooling system is operating normally.

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

[0010] Among them, step 2210 includes: increasing the operating frequency of the fan of the evaporative condenser, and then determining whether the exhaust pressure of the evaporative refrigeration system decreases; if it is determined that the exhaust pressure of the evaporative refrigeration system has not decreased, then determining that the cause of the high exhaust pressure of the evaporative refrigeration system is a failure of the fan of the evaporative condenser.

[0011] In some embodiments, the step 2000 includes: when the acquired value of P is greater than P0, determining whether the value of T2 is greater than T21, and determining the fault cause of the excessively high exhaust pressure of the evaporative cooling refrigeration system according to the determination result;

[0012] Among them, P0 is the minimum critical value of the pressure of the air in the evaporative condenser after completing heat exchange with the water passing through the packing when the evaporative cooling system is operating normally, and T21 is the maximum critical value of the temperature of the water in the evaporative condenser after heat exchange with the heat exchange tube before entering the packing when the evaporative cooling system is operating normally.

[0013] In some embodiments, the step 2000 includes:

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

[0015] Wherein, step 2110 includes: judging whether the value of ΔT is greater than ΔT0, and judging the fault cause of the excessive exhaust pressure of the evaporative cooling refrigeration system according to the judgment result, wherein ΔT0 is the minimum critical value of the temperature difference between the water after heat exchange with the heat exchange tube in the evaporative condenser before entering the packing and after being output from the packing when the evaporative cooling refrigeration system is operating normally.

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

[0017] Among them, step 2111 includes: increasing the operating frequency of the cooling water pump of the evaporative condenser used to extract water from the water collecting container and pump circulating water, and then judging whether the exhaust pressure of the evaporative refrigeration system decreases; if it is judged that the exhaust pressure of the evaporative refrigeration system does not decrease, then it is judged that the cause of the malfunction of the exhaust pressure of the evaporative refrigeration system being too high is the lack of water in the water collecting container of the evaporative condenser.

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

[0019] Among them, step 2112 includes: reducing the operating frequency of the compressor of the evaporative cooling refrigeration system, and then determining whether the exhaust pressure of the evaporative cooling refrigeration system decreases. If it is determined that the exhaust pressure of the evaporative cooling refrigeration system has not decreased, it is determined that the cause of the malfunction of the exhaust pressure of the evaporative cooling refrigeration system being too high is that the packing of the evaporative condenser is dirty and clogged.

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

[0021] Wherein, step 2120 includes: judging whether the value of ΔT is greater than ΔT0, if the judgment result is no, judging that the fault cause of the exhaust pressure of the evaporative cooling system is too high is the scaling of the heat exchange tube, wherein ΔT0 is the minimum critical value of the temperature difference between the water after heat exchange with the heat exchange tube in the evaporative condenser before entering the packing and after being output from the packing when the evaporative cooling system is operating normally.

[0022] The second aspect of the present invention discloses an evaporative cooling refrigeration system using any of the above-mentioned methods for judging the fault of excessive exhaust pressure of the evaporative cooling refrigeration system, comprising:

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

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

[0025] In some embodiments, when the evaporative condenser is working, the fan of the evaporative condenser causes the air entering the evaporative condenser to flow 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 judgment method for excessive exhaust pressure of an evaporative cooling refrigeration system provided by the present invention, by obtaining the pressure P and temperature T1 of the air in the evaporative condenser after completing heat exchange with water passing through the packing, obtaining the temperature T2 of the water in the evaporative condenser after heat exchange with the heat exchange tube before entering the packing, and obtaining 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 being output from the packing, some common fault causes of excessive exhaust pressure of the evaporative cooling refrigeration system can be quickly judged based on the obtained results of P, T1, T2 and ΔT.

[0027] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 A schematic diagram of the structural principle of an evaporative cooling refrigeration system according to an embodiment of the present invention;

[0030] Figure 2 It is a structural schematic diagram of an evaporative condenser of an evaporative cooling refrigeration system according to an embodiment of the present invention;

[0031] Figure 3 The present invention is a flowchart of a method for determining a fault in which the exhaust pressure of an evaporative cooling system is too high. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0037] When the evaporative cooling system is working, the compressor 4 compresses the refrigerant into a high temperature and high pressure. There are many reasons for the failure of the compressor 4 to have an excessively high exhaust pressure, some of which are common reasons including the failure of the fan 11, the lack of water in the water collection container 15, the dirty blockage of the filler 14, the scaling of the heat exchange tube 13, etc. When the fan 11 fails, the fan 11 cannot work normally and cannot provide enough air volume to the evaporative condenser 1, resulting in poor cooling effect of the refrigerant in the evaporative condenser 1, and the refrigerant cannot be cooled normally, so that the refrigerant is still at a high temperature when it is output from the evaporative condenser 1, and finally circulates to the compressor 4 and is discharged from the compressor 4, resulting in excessive exhaust pressure. When the water collection container 15 is short of water, the water source of the water pump pumping water from the water collection container 15 to the spray device 12 is insufficient, and the water sprayed by the spray device 12 onto the heat exchange tube 13 is insufficient, resulting in poor heat exchange effect with the heat exchange tube 13, and the refrigerant cannot be cooled normally, so that the refrigerant is still at a high temperature when it is output from the evaporative condenser 1, and finally circulates to the compressor 4 and is discharged from the compressor 4, resulting in excessive exhaust pressure. The packing 14 of the evaporative condenser 1 refers to a device for increasing the heat exchange area and improving the heat exchange efficiency in the evaporative condenser 1. The packing 14 can be made of porous materials, such as plastic, ceramic, metal, etc., and has various shapes, such as plate, ring, sphere, etc. These packings 14 increase the gas-liquid contact area and accelerate the heat transfer rate by dispersing the incoming fluid into many small droplets or small bubbles. When the packing 14 is dirty and clogged, the heat exchange channel is blocked, and the heat exchange efficiency will be greatly reduced, which will cause the cooling effect of the water entering the packing 14 by the wind introduced by the fan 11 to be greatly reduced, resulting in the temperature of the water entering the water collection container 15 cannot be effectively reduced, so that when it is pumped into the spray device 12 and sprayed from the spray device 12 to the heat exchange tube 13, due to the high water temperature, it is difficult to achieve a good heat exchange effect with the refrigerant in the heat exchange tube 13, resulting in the refrigerant being unable to cool down normally, so that the refrigerant is still at a high temperature when it is output from the evaporative condenser 1, and finally circulates to the compressor 4 and is discharged from the compressor 4, resulting in excessive exhaust pressure. When the heat exchange tube 13 is scaled, the efficiency of direct heat exchange between the water sprayed by the spray device 12 on the heat exchange tube 13 and the refrigerant in the heat exchange tube 13 is reduced, resulting in the refrigerant being unable to cool down normally, so that the refrigerant is still at a high temperature when it is output from the evaporative condenser 1, and finally circulates to the compressor 4 and is discharged from the compressor 4, resulting in excessive exhaust pressure. The purpose of this application is to provide a method for determining some common causes of a fault in which the exhaust pressure is too high.

[0038] The method for judging the fault of too high exhaust pressure in the evaporative cooling system of this embodiment includes step 1000 and step 2000. When it is observed that the evaporative cooling system has a fault of too high exhaust pressure, for example, a pressure sensor is arranged on the pipeline between the compressor 4 and the evaporative condenser 1, and when the pressure of the refrigerant detected by the pressure sensor exceeds the normal range, the fault of too high exhaust pressure is judged.

[0039] Step 1000, obtain the pressure P and temperature T1 of the air in the evaporative condenser 1 after the heat exchange with the water passing through the packing 14 is completed, that is, obtain the pressure and temperature after the wind introduced into the evaporative condenser 1 by the fan 11 completes cooling of the water passing through the packing 14. Obtain the temperature T2 of the water in the evaporative condenser 1 before entering the packing 14 after the heat exchange with the heat exchange tube 13, that is, the temperature T2 of the water before entering the packing 14 after the heat exchange with the refrigerant in the heat exchange tube 13 and before being cooled by the air in the packing 14. Obtain the temperature difference ΔT of the water in the evaporative condenser 1 before entering the packing 14 and after being output from the packing 14 after the heat exchange with the heat exchange tube 13 is completed, that is, obtain the temperature ΔT of the water cooled by the wind introduced by the fan 11 in the packing 14.

[0040] Step 2000, judging the cause of the evaporative cooling system's exhaust pressure being too high based on the obtained results of P, T1, T2 and ΔT. Based on the above data, some common causes of failures such as fan 11 failure, water shortage in water collection container 15, dirty plugging of filler 14, scaling of heat exchange tube 13, etc. can be judged.

[0041] The step numbers of this application (such as the above step 1000 and step 2000) do not limit the order of execution of the steps. Whether there is an order of execution between the steps can be judged according to the text content. If there is a logical order requirement for the execution of the steps, it is understood that they should be executed in order. If it is logically judged that they can be executed in a non-sequential manner, there is no order between the steps. At the same time, if there is no clear wording to express the order in the description of multiple actions within a step, there is no limitation on the execution order of each action.

[0042] The method for judging the fault of the exhaust pressure of the evaporative cooling system being too high in the present embodiment obtains the pressure P and temperature T1 of the air in the evaporative condenser 1 after completing the heat exchange with the water passing through the packing 14, obtains the temperature T2 of the water in the evaporative condenser 1 after the heat exchange with the heat exchange tube 13 before entering the packing 14, and obtains the temperature difference ΔT between the water in the evaporative condenser 1 after the heat exchange with the heat exchange tube 13 before entering the packing 14 and after being output from the packing 14. Some common fault causes of the exhaust pressure of the evaporative cooling system being too high can be quickly judged based on the obtained results of P, T1, T2 and ΔT.

[0043] In some embodiments, step 2000 includes: when the acquired value of P is less than P0, determining whether the value of T1 is greater than T10, and determining the fault cause of the excessively high exhaust pressure of the evaporative cooling system according to the determination result;

[0044] Wherein, P0 is the minimum critical value of the pressure of the air in the evaporative condenser 1 after the heat exchange with the water in the packing 14 is completed when the evaporative refrigeration system is operating normally, and T10 is the minimum critical value of the temperature of the air in the evaporative condenser 1 after the heat exchange with the water in the packing 14 is completed when the evaporative refrigeration system is operating normally. When the evaporative refrigeration system is operating normally, the air introduced by the fan 11 passes through the packing 14 and exchanges heat with the water in the packing 14, and the air temperature is increased, and the pressure and temperature of the air will increase. When the evaporative refrigeration system is operating normally, the exhaust 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 that can meet the heat exchange requirements with the water in the packing 14. After passing through the packing 14 and completing the normal heat exchange with the water passing through the packing 14, the pressure of the air passing through the packing 14 will rise to above the minimum critical value. In this embodiment, when the exhaust pressure is too high, if the obtained value of P is less than P0, and the value of T1 is judged to be greater than T10, it is judged that the flow rate of air entering the evaporative condenser 1 is abnormal and lower than the minimum flow rate required normally, and it can be judged that there is a high possibility of a failure of the fan 11. If the obtained value of P is less than P0, and the value of T1 is judged to be less than T10, the flow rate of air entering the evaporative condenser 1 may be lower than the minimum flow rate required normally, or the flow rate of air may be greater than the minimum flow rate, and the heat absorbed by the wind when the filler 14 exchanges heat with water is low. The cause of the fault of judging that the exhaust pressure is too high is more complicated and needs to be further clarified.

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

[0046] Wherein, step 2210 includes: increasing the operating frequency of the fan 11 of the evaporative condenser 1, and then judging whether the exhaust pressure of the evaporative refrigeration system decreases. If it is judged that the exhaust pressure of the evaporative refrigeration system does not decrease, it is judged that the fault cause of the high exhaust pressure of the evaporative refrigeration system is the fault of the fan 11 of the evaporative condenser 1. In this embodiment, if the value of P obtained is less than P0, and it is judged that the value of T1 is greater than T10, it is judged that the flow rate of air entering the evaporative condenser 1 is abnormal and lower than the minimum flow rate required normally. When the operating frequency of the fan 11 is increased, the exhaust pressure of the evaporative refrigeration system does not decrease, which means that the flow rate of air entering the evaporative condenser 1 cannot be increased by increasing the operating frequency of the fan 11, and it can be judged that the fault cause of the high exhaust pressure is the fault of the fan 11. When the operating frequency of the fan 11 is increased, the exhaust pressure of the evaporative refrigeration system decreases, which means that the flow rate of air entering the evaporative condenser 1 can be increased by increasing the operating frequency of the fan 11. The reason why the flow rate of air entering the evaporative condenser 1 is lower than the minimum flow rate may be complex reasons such as control system errors, which need to be further clarified.

[0047] In some embodiments, step 2000 includes: when the acquired value of P is greater than P0, determining whether the value of T2 is greater than T21, and determining the fault cause of the excessively high exhaust pressure of the evaporative cooling system according to the determination result;

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

[0049] In some embodiments, step 2000 includes:

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

[0051] Wherein, step 2110 includes: judging whether the value of ΔT is greater than ΔT0, and judging the fault cause of the excessively high exhaust pressure of the evaporative cooling refrigeration system according to the judgment result, wherein 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 refrigeration system is operating normally. When the evaporative cooling refrigeration system is operating normally, the water sprayed by the spray device 12 is normally heated up after heat exchange 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 refrigeration system is operating normally, the temperature of the water dropped after being normally cooled by the air through the packing 14 will exceed the lower limit of the normal drop temperature, that is, not lower than 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 exhaust pressure is too high, if the obtained value of P is greater than P0, and the value of T2 is greater than T21, it is judged that the water collection container 15 is short of water or the filler 14 is dirty and blocked. Further, if it is judged that the value of ΔT is greater than ΔT0, it means that the air can normally cool the water at the filler 14, and it can be judged that the water collection container 15 is short of water. If it is judged that the value of ΔT is less than ΔT0, it is judged that the filler 14 is dirty and blocked. In this embodiment, by further judging whether the value of ΔT is greater than ΔT0, it can be further judged whether the cause of the fault is that the water collection container 15 is short of water or the filler 14 is dirty and blocked.

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

[0053] Wherein, step 2111 includes: increasing the operating frequency of the cooling water pump 16 of the evaporative condenser 1 for pumping water from the water collecting container 15 and pumping circulating water, and then judging whether the exhaust pressure of the evaporative cooling refrigeration system decreases. If it is judged that the exhaust pressure of the evaporative cooling refrigeration system does not decrease, it is judged that the fault cause of the high exhaust pressure of the evaporative cooling refrigeration system is the lack of water in the water collecting container 15 of the evaporative condenser 1. In this embodiment, when the exhaust pressure is too high, if the value of P obtained is greater than P0, and it is judged that the value of T2 is greater than T21, and the value of ΔT is greater than ΔT0, it is judged that the possibility of the lack of water in the water collecting container 15 is high. When the operating frequency of the cooling water pump 16 of the evaporative condenser 1 for pumping water from the water collecting container 15 and pumping circulating water is increased, the exhaust pressure of the evaporative cooling refrigeration system does not decrease, which means that the frequency of the cooling water pump 16 is increased and the amount of water sprayed by the spray device 12 cannot be increased, and it can be judged that the fault cause of the high exhaust pressure is the lack of water in the water collecting container 15. In some embodiments, the water collecting 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 extract water from the water collecting container 15 and pump circulating water, is increased, the exhaust pressure of the evaporative refrigeration system decreases. This means that the increase in 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 collecting container 15 is not short of water. The reason for the low amount of water sprayed by the spray device 12 may be 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, and if the determination result is no, executing step 2112;

[0055] Wherein, step 2112 includes: reducing the operating frequency of the compressor 4 of the evaporative cooling refrigeration system, and then judging whether the exhaust pressure of the evaporative cooling refrigeration system decreases. If it is judged that the exhaust pressure of the evaporative cooling refrigeration system does not decrease, it is judged that the fault cause of the high exhaust pressure of the evaporative cooling refrigeration system is that the packing 14 of the evaporative condenser 1 is dirty and blocked. If the obtained value of P is greater than P0, and it is judged that the value of T2 is greater than T21, and the value of ΔT is less than ΔT0, it is judged that the possibility of the packing 14 being dirty and blocked is relatively large. When the operating frequency of the compressor 4 of the evaporative cooling refrigeration system is reduced, the exhaust pressure of the evaporative cooling refrigeration system does not decrease, and it can be judged that the fault cause of the high exhaust pressure is that the packing 14 is dirty and blocked. When the operating frequency of the compressor 4 of the evaporative cooling refrigeration system is reduced, the exhaust pressure of the evaporative cooling refrigeration system decreases, which means that the fault cause of the high exhaust pressure may be a complex reason such as small air volume, blockage of the refrigerant flow pipeline, etc., which causes excessive heat of the heat source, and needs to be further clarified.

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

[0057] Wherein, step 2120 includes: judging whether the value of ΔT is greater than ΔT0, if the judgment result is no, then judging that the fault cause of the high exhaust pressure of the evaporative cooling system is the scaling of the heat exchange tube 13, wherein 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 operating normally. If the obtained value of P is greater than P0, and it is judged that 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 amount 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 means 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 at the heat exchange tube 13 is very poor, so this embodiment can judge that the fault cause of the high exhaust pressure is the scaling of the heat exchange tube 13.

[0058] In some embodiments, an evaporative cooling refrigeration system using any of the above-mentioned methods for judging the fault of excessive exhaust pressure of the evaporative cooling refrigeration system is also disclosed, comprising:

[0059] A refrigeration cycle system comprises a compressor 4, an evaporative condenser 1, an expansion valve 2 and an evaporator 3 connected in series in sequence;

[0060] The detection device includes a pressure detection sensor 174 and a first temperature detection sensor 173 for respectively detecting the pressure P and temperature T1 of the air in the evaporative condenser 1 after the air has completed heat exchange with the water passing through the packing 14. The detection device also includes a second temperature detection sensor 171 for detecting the temperature T2 of the water in the evaporative condenser 1 before entering the packing 14 after the water has exchanged heat with the heat exchange tube 13 and a third temperature detection sensor 172 for detecting the temperature T3 after the water is output from the packing 14. By detecting T2 and T3, the temperature ΔT of the water can be obtained when the wind introduced by the fan 11 cools the water in the packing 14.

[0061] In some embodiments, 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 from the outlet of the packing 14 to the inlet of the packing 14, and the pressure detection sensor 174 and the first temperature detection sensor 173 are arranged between the heat exchange tube 13 and the packing 14. The arrangement of this embodiment can effectively obtain the pressure P and temperature T1 of the air in the evaporative condenser 1 after the air has completed the heat exchange with the water passing through the packing 14. Figure 2In the illustrated embodiment, the amount of water flowing down from the heat exchange tube is not very large and will not fill the space between the heat exchange tube and the filler. Therefore, the first temperature detection sensor 173 is arranged between the heat exchange tube 13 and the filler 14 to 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 completing the heat exchange with the water passing through the filler 14.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for judging the fault of excessive exhaust pressure in an evaporative cooling system, characterized in that: include: Step 1000, obtaining the pressure P and temperature T1 of the air in the evaporative condenser (1) after completing heat exchange with the water passing through the packing (14), obtaining 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 obtaining 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 being output from the packing (14); Step 2000, judging the fault cause of the exhaust pressure of the evaporative cooling system being too high according to the obtained results of P, T1, T2 and ΔT.

2. The method for judging the fault of excessive exhaust pressure of the evaporative cooling system according to claim 1, characterized in that: The step 2000 includes: when the acquired value of P is less than P0, determining whether the value of T1 is greater than T10, and determining the fault cause of the exhaust pressure of the evaporative cooling system being too high according to the determination result; Wherein, P0 is the minimum critical value of the pressure of the air in the evaporative condenser (1) after completing the heat exchange with the water passing through the filler (14) when the evaporative cooling system is operating normally, and T10 is the minimum critical value of the temperature of the air in the evaporative condenser (1) after completing the heat exchange with the water passing through the filler (14) when the evaporative cooling system is operating normally.

3. The method for judging the fault of excessive exhaust pressure of the evaporative cooling system according to claim 2, characterized in that: The step 2000 further includes: when the acquired value of P is less than P0, determining whether the value of T1 is greater than T10, and if the determination result is yes, executing step 2210; Wherein, step 2210 comprises: increasing the operating frequency of the fan (11) of the evaporative condenser (1), and then determining whether the exhaust pressure of the evaporative refrigeration system decreases; if it is determined that the exhaust pressure of the evaporative refrigeration system does not decrease, determining that the cause of the malfunction of the exhaust pressure of the evaporative refrigeration system being too high is a malfunction of the fan (11) of the evaporative condenser (1).

4. The method for judging the fault of excessive exhaust pressure of the evaporative cooling system according to claim 1, characterized in that: The step 2000 includes: when the acquired value of P is greater than P0, determining whether the value of T2 is greater than T21, and determining the fault cause of the excessively high exhaust pressure of the evaporative cooling refrigeration system according to the determination result; Wherein, P0 is the minimum critical value of the pressure of the air in the evaporative condenser (1) after completing heat exchange with the water passing through the filler (14) when the evaporative cooling system is operating normally, and T21 is the maximum critical value of the temperature of the water in the evaporative condenser (1) before entering the filler (14) after completing heat exchange with the heat exchange tube (13) when the evaporative cooling system is operating normally.

5. The method for judging the fault of excessive exhaust pressure of the evaporative cooling system according to claim 4, characterized in that: The step 2000 includes: When the obtained value of P is greater than P0, determine whether the value of T2 is greater than T21. If the determination result is yes, execute step 2110. Wherein, step 2110 comprises: judging whether the value of ΔT is greater than ΔT0, and judging the cause of the fault of excessive exhaust pressure of the evaporative cooling system according to the judgment result, wherein 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 operating normally.

6. The method for judging the fault of excessive exhaust pressure of the evaporative cooling system according to claim 5, characterized in that: The step 2110 includes: determining whether the value of ΔT is greater than ΔT0, and if the determination result is yes, executing step 2111; Wherein, step 2111 comprises: increasing the operating frequency of the cooling water pump (16) of the evaporative condenser (1) for extracting water from the water collecting container (15) and pumping circulating water, and then judging whether the exhaust pressure of the evaporative refrigeration system decreases; if it is judged that the exhaust pressure of the evaporative refrigeration system does not decrease, then judging that the cause of the malfunction of the exhaust pressure of the evaporative refrigeration system being too high is that the water collecting container (15) of the evaporative condenser (1) is short of water.

7. The method for judging the fault of excessive exhaust pressure of the evaporative cooling system according to claim 5, characterized in that: The step 2110 includes: determining whether the value of ΔT is greater than ΔT0, if the determination result is no, executing step 2112; Wherein, step 2112 comprises: reducing the operating frequency of the compressor (4) of the evaporative cooling refrigeration system, and then determining whether the exhaust pressure of the evaporative cooling refrigeration system decreases; if it is determined that the exhaust pressure of the evaporative cooling refrigeration system does not decrease, then determining that the cause of the malfunction of the exhaust pressure of the evaporative cooling refrigeration system being too high is that the packing (14) of the evaporative condenser (1) is dirty and clogged.

8. The method for judging the fault of excessive exhaust pressure of the evaporative cooling system according to claim 4, characterized in that: The step 2000 includes: when the acquired value of P is greater than P0, determining whether the value of T2 is greater than T21, if the determination result is no, executing step 2120; Wherein, step 2120 comprises: judging whether the value of ΔT is greater than ΔT0; if the judgment result is no, judging that the fault cause of the exhaust pressure of the evaporative cooling system being too high is scaling of 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 operating normally.

9. An evaporative cooling refrigeration system using the method for judging the fault of excessive exhaust pressure of the evaporative cooling refrigeration system as claimed in any one of claims 1 to 8, characterized in that: include: A refrigeration cycle system, comprising a compressor (4), an evaporative condenser (1), an expansion valve (2) and an evaporator (3) connected in series in sequence; The detection device comprises a pressure detection sensor and a first temperature detection sensor (173) for respectively detecting the pressure P and the temperature T1 of the air in the evaporative condenser (1) after completing heat exchange with water passing through the filler (14); the detection device also comprises a second temperature detection sensor (171) for detecting the temperature T2 of the water in the evaporative condenser (1) before entering the filler (14) after heat exchange with the heat exchange tube (13) and a third temperature detection sensor (172) for detecting the temperature T3 of the water after being output from the filler (14).

10. The method for judging the fault of excessive exhaust pressure of the evaporative cooling system according to claim 9, characterized in that: When the evaporative condenser (1) is in operation, the fan (11) of the evaporative condenser (1) causes the air entering the evaporative condenser (1) to flow in a direction from an outlet of the filler (14) to an inlet of the filler (14), and the pressure detection sensor and the first temperature detection sensor (173) are arranged between the heat exchange tube (13) and the filler (14).

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