Evaporative condensing unit capable of raising the dry-wet condition switching limit temperature

Abstract

The present application provides an evaporative condensing unit that can improve the critical temperature for switching between dry and wet working conditions. It uses a fin-tube heat exchanger with a smaller fin spacing to increase the number of fins and improve the heat exchange efficiency. At the same time, a first flow regulating unit is set between the fin-tube heat exchanger and the external environment, and a second flow regulating unit is set between the filler and the external environment. The heat exchange requirements under dry and wet working conditions are solved by automatically adjusting the air flow. Under dry working conditions, the expanded area of ​​the fins is used to increase the heat exchange area between the evaporative condensing unit and the air. Under wet working conditions, the heat of the fin-tube heat exchanger is completely removed by spraying water. By adjusting the air flow, the air flow through the fin-tube heat exchanger is reduced during spraying, avoiding excessive air resistance caused by adding fins. The automatic adjustment of the flow of the air flow channel under dry and wet working conditions can give full play to the performance of the fin-tube heat exchanger, and ultimately achieve the effect of improving the critical temperature for switching between dry and wet working conditions, improve the energy efficiency of the system, and save water resources.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to an evaporative condensing unit capable of increasing the dry-wet working condition switching limit temperature. Background Art

[0002] Traditional evaporative condensers offer energy-saving and emission-reduction benefits, but they also suffer from several drawbacks. A key issue is that, while low-temperature ambient air can theoretically cool the hot fluid when the ambient temperature is low, evaporative condensers are designed for spraying (wet) conditions. Consequently, spraying stops only when the ambient temperature is very low (e.g., 5°C), failing to fully utilize the cooling capacity of the sensible heat of the ambient air. Furthermore, spraying results in high system resistance, requiring more work input, and consuming water resources.

[0003] Therefore, this also leads to the problem that the switching threshold temperature between dry and wet conditions in existing evaporative condensers is relatively low. On the other hand, the coils in existing evaporative condensers mostly use bare tubes, which have a small heat exchange area on the air side. Only when the ambient temperature is very low can a large temperature difference compensate for the lack of heat exchange area. One of the main reasons why finned tube heat exchangers cannot be used is that after adding fins, the system resistance under spray conditions increases significantly. In general, if you want to improve the heat exchange capacity under dry conditions, you need to add fins; if you want to improve the heat exchange performance under spray conditions, you need to reduce the number of fins; there is an irreconcilable contradiction between the two. Summary of the Invention

[0004] In view of this, the present application provides an evaporative condensing unit that can improve the dry and wet working condition switching limit temperature, so as to achieve the effect of improving the dry and wet working condition switching limit temperature, saving water resources and improving system energy efficiency.

[0005] The present application provides an evaporative condensing unit capable of increasing the dry-wet operating condition switching limit temperature, comprising:

[0006] A first air passage is formed between the fin-tube heat exchanger and the external environment, wherein a first flow regulating unit is provided in the first air passage for automatically regulating the flow of external air to the fin-tube heat exchanger;

[0007] A second air passage is formed between the filler and the external environment, and a second flow regulating unit is provided in the second air passage for automatically regulating the air flow of the external air to the filler;

[0008] a first water distributor, for spraying first spray water to the fin-tube heat exchanger under wet conditions;

[0009] a second water distributor, for spraying second spray water to the filler under wet conditions; and

[0010] The water storage container includes a first water tank and a second water tank; the first water tank is used to recover the first spray water after heat exchange, and the first water tank is connected to the second water distributor to supply water thereto; the second water tank is used to recover the second spray water after heat exchange, and the second water tank is connected to the first water distributor to supply water thereto.

[0011] In one embodiment, the first flow regulating unit is a first automatic air valve, and the second flow regulating unit is a second automatic air valve.

[0012] In one embodiment, under dry conditions, the first automatic air valve is fully opened and the second automatic air valve is fully closed; under wet conditions, the first automatic air valve is partially opened and the second automatic air valve is fully opened.

[0013] In one embodiment, it includes: a casing; the filler is arranged in the casing, a first mounting port and a second mounting port are provided on the side wall of the casing in sequence along a first direction, the first automatic air valve is arranged in the first mounting port, the fin-tube heat exchanger is arranged on the inner side of the first mounting port and adjacent to the filler, and the second automatic air valve is arranged in the second mounting port.

[0014] In one embodiment, the opposite side walls of the first mounting opening extend a preset distance outside the casing, and the first mounting opening forms the first air channel; the opposite side walls of the second mounting opening extend a preset distance outside the casing, and the second air channel is formed between the second mounting opening and the bottom of the filler.

[0015] In one embodiment, the first water distributor is arranged on one side of the fin-tube heat exchanger, and the second water distributor is arranged on one side of the packing; the first water storage tank and the second water storage tank are both arranged at the bottom of the casing, and the first water storage tank is arranged corresponding to the fin-tube heat exchanger, and the second water storage tank is arranged corresponding to the packing.

[0016] In one embodiment, the machine casing further includes: a fan; the fan is arranged on the top of the casing and is used to provide power for the air flow in the casing.

[0017] In one embodiment, a plurality of the fin-tube heat exchangers are provided, and the number of the first automatic air valve, the second automatic air valve, and the first water storage tank is the same as that of the fin-tube heat exchangers.

[0018] In one embodiment, the first water storage tank is connected to the second water distributor via a first water pipe, and the first water pipe is provided with a first water pump;

[0019] The second water storage tank is connected to the first water distributor through a second water pipe, and the second water pipe is provided with a second water pump.

[0020] In one embodiment, it further includes:

[0021] a filter, the filter being used to filter particulate matter in the air entering the housing;

[0022] a water collector, the water collector being used to collect particulate droplets in the air flowing out of the housing;

[0023] A water replenishment pump is used to replenish water into the first water storage tank and the second water storage tank.

[0024] In summary, the present application provides an evaporative condensing unit capable of improving the dry-wet working condition switching limit temperature, adopting a fin-tube heat exchanger to increase the number of fins of the evaporative condensing unit and improve the heat exchange efficiency of the evaporative condensing unit. Since a first flow regulating unit is provided between the fin-tube heat exchanger and the external environment, and a second flow regulating unit is provided between the filler and the external environment, the evaporative condensing unit solves the heat exchange requirements under dry and wet working conditions by automatically adjusting the air flow. Under dry working conditions, the expanded area of ​​the fins is utilized to increase the heat exchange area between the evaporative condensing unit and the air, thereby improving the heat exchange capacity. Under wet working conditions, the heat of the fin-tube heat exchanger is completely removed by spraying water. By adjusting the air flow, the air flow through the fin-tube heat exchanger is reduced during spraying to avoid excessive air resistance caused by adding fins. The automatic adjustment of the flow of the air flow channel under dry and wet working conditions can give full play to the performance of the fin-tube heat exchanger, ultimately achieving the effect of improving the dry-wet working condition switching limit temperature, improving the system energy efficiency, and saving water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of an evaporative condensing unit that is illustrative of the present application and is capable of increasing the dry-wet condition switching limit temperature. DETAILED DESCRIPTION

[0026] Before describing the embodiments in detail, it should be understood that the present application is not limited to the detailed structure or component arrangement described below or in the accompanying drawings in this application. The present application may be an embodiment implemented in other ways. Moreover, it should be understood that the words and terms used herein are for descriptive purposes only and should not be interpreted restrictively. The words "including", "comprising", "having" and similar words used herein are intended to include the matters listed thereafter, their equivalents and other additional matters. In particular, when describing "a certain element", the present application does not limit the number of the element to one, but may also include multiple elements.

[0027] Please refer to Figure 1As shown, the present application provides an evaporative condensing unit 10 based on evaporative condensing technology that can improve the dry-wet working condition switching limit temperature. Compared with the traditional evaporative condenser, the evaporative condensing unit 10 of the present application can make full use of the cooling capacity of the sensible heat part in the ambient low-temperature air, and automatically adjust the airflow under dry and wet working conditions, thereby achieving the effect of improving the dry-wet working condition switching limit temperature, improving the system energy efficiency, and saving water resources.

[0028] Specifically, the evaporative condensing unit 10 includes a casing 12, a fan 14, a filter, a water collector, a first water distributor 16, a second water distributor 18, a fin-tube heat exchanger 20, a filler 22, and a water storage container. The fan 14 is arranged at the top of the casing 12 to provide power for the air flow inside the casing 12, so as to force the air inside the casing 12 to flow rapidly, promote the evaporation of water on the surface of the heat exchange element to absorb heat, thereby accelerating heat exchange and having a certain cooling effect. The fan 14 draws the air inside the casing 12 outward, that is, the fan 14 draws the air inside the casing 12 rapidly by drawing air upward; for example, two fans 14 are provided, and the two fans 14 are arranged side by side at intervals on the top of the casing 12 to further accelerate the air flow inside the casing 12.

[0029] A first air passage 28 is formed between the fin-tube heat exchanger 20 and the external environment. A first flow regulating unit is provided in the first air passage 28 for automatically regulating the flow of external air to the fin-tube heat exchanger 20. In wet conditions, the first flow regulating unit regulates the flow of external air to the fin-tube heat exchanger 20 to zero, i.e., in wet conditions, the first flow regulating unit prevents external air from flowing to the fin-tube heat exchanger 20 to avoid increasing system resistance. In dry conditions, the first flow regulating unit regulates the flow of external air to the fin-tube heat exchanger 20 to a maximum, i.e., in dry conditions, the first flow regulating unit allows external air to flow to the fin-tube heat exchanger 20. The external air exchanges heat with the fin-tube heat exchanger 20 to remove heat from the fin-tube heat exchanger 20 to meet heat exchange requirements. The wet conditions here refer to spray conditions. It should be understood that in some embodiments, under dry conditions, the air flow rate of the external air flowing to the fin-tube heat exchanger 20 adjusted by the first flow regulating unit does not necessarily have to be maximum, as long as the air flow rate of the external air flowing to the fin-tube heat exchanger 20 can meet the heat exchange demand, and there is no specific limitation.

[0030] A second air passage 30 is formed between the packing 22 and the external environment. A second flow regulating unit is disposed within the second air passage 30 for automatically regulating the flow of external air toward the packing 22. In wet operating conditions, the second flow regulating unit regulates the flow of external air toward the packing 22 to a maximum value, i.e., in wet operating conditions, the second flow regulating unit allows external air to flow toward the packing 22. In dry operating conditions, the second flow regulating unit regulates the flow of external air toward the packing 22 to zero, i.e., in dry operating conditions, the second flow regulating unit prevents external air from flowing toward the packing 22. It should be understood that in some embodiments, in wet operating conditions, the flow of external air toward the packing 22 regulated by the second flow regulating unit does not necessarily need to be maximum, as long as the flow of external air toward the packing 22 meets demand, and this is not a specific limitation.

[0031] The first water distributor 16 is used to spray the first spray water to the fin-tube heat exchanger 20 under wet conditions; that is, under wet conditions, the first water distributor 16 works, and under dry conditions, the first water distributor 16 does not work.

[0032] The second water distributor 18 is used to spray the second spray water to the filler 22 under wet conditions; that is, under wet conditions, the second water distributor 18 works, and under dry conditions, the second water distributor 18 does not work.

[0033] The water storage container includes a first water tank 24 and a second water tank 26; the first water tank 24 is used to recover the first spray water after heat exchange, and the first water tank 24 is connected to the second water distributor 18 to supply water thereto (i.e., the second water distributor 18); the second water tank 26 is used to recover the second spray water after heat exchange, and the second water tank 26 is connected to the first water distributor 16 to supply water thereto (i.e., the first water distributor 16).

[0034] Under wet working conditions, the first water distributor 16 and the second water distributor 18 are working, the first flow regulating unit regulates the air flow of the external air to the fin-tube heat exchanger 20 to zero, and the second flow regulating unit regulates the air flow of the external air to the packing 22 to the maximum, and the external air (hot air) flowing to the packing 22 exchanges heat with the second spray water (high-temperature water) sprayed to the packing 22 by the second water distributor 18, so that the second spray water undergoes direct evaporation cooling and is converted into low-temperature water (that is, the second spray water after heat exchange is cold water). The second spray water after heat exchange flows into the second water storage tank 26, and the first water distributor 16 connected to the second water storage tank 26 sprays the first spray water (cold water) to the fin-tube heat exchanger 20, so that a liquid film is formed on the surface of the fin-tube heat exchanger 20, and the liquid film exchanges heat with the fin-tube heat exchanger 20, so that the fin-tube heat exchanger 20 is cooled down, thereby taking away the heat of the fin-tube heat exchanger 20. That is, under wet conditions, the heat of the fin-tube heat exchanger 20 is completely removed by the cold water. Because the first flow regulating unit regulates the air flow from the outside air to the fin-tube heat exchanger 20 to zero under wet conditions, that is, when the spray system is operating, the outside air will not flow into the fin-tube heat exchanger 20. Even if the evaporative condensing unit 10 of the present application adopts the fin-tube heat exchanger 20, the addition of fins will not cause excessive air resistance, and thus will not increase system resistance.

[0035] Under dry conditions, since the first water distributor 16 and the second water distributor 18 are not working, the first flow regulating unit regulates the air flow of the external air to the fin-tube heat exchanger 20 to be maximum, and the second flow regulating unit regulates the air flow of the external air to the packing 22 to be zero. Therefore, the heat of the fin-tube heat exchanger 20 is completely taken away by the external air (cold air). Since the fin-tube heat exchanger 20 has fins, compared with the existing evaporative condenser that cannot use a fin-tube heat exchanger, the evaporative condensing unit 10 of the present application has a larger heat exchange area and a stronger heat exchange capacity. Therefore, the evaporative condensing unit 10 of the present application can switch to a dry working condition to work at a higher ambient temperature. For example, the existing evaporative condenser needs to stop spraying and switch to a dry working condition to work when the ambient temperature is not higher than 5°C, while the evaporative condensing unit 10 of the present application will stop spraying and switch to a dry working condition to work when the ambient temperature is not higher than 10°C, which expands the applicable temperature range of the dry working condition of the evaporative condensing unit 10. The evaporative condensing unit 10 increases the dry-wet working condition switching limit temperature, which can reduce the use of the spray system, save water resources, and improve the system energy efficiency.

[0036] In the illustrated embodiment, the filter, water collector, first water distributor 16, second water distributor 18, fin-tube heat exchanger 20, packing 22, first water storage tank 24, and second water storage tank 26 are all disposed within the housing 12. A first air passage 28 is formed between the fin-tube heat exchanger 20 and the external environment, allowing external air to enter the fin-tube heat exchanger 20 through the first air passage 28. A first flow regulating unit is disposed within the first air passage 28 for automatically regulating the flow of external air into the fin-tube heat exchanger 20. In this embodiment, the first flow regulating unit is implemented as a first automatic damper 32. A second air passage 30 is formed between the packing 22 and the external environment, allowing external air to enter the packing 22 through the second air passage 30. A second flow regulating unit is disposed within the second air passage 30 for automatically regulating the flow of external air into the packing 22. The second flow regulating unit is implemented as a second automatic damper 34. The first automatic air valve 32 and the second automatic air valve 34 can automatically adjust the air flow entering the first air channel 28 and the air flow entering the second air channel 30 according to actual working conditions, thereby achieving the effect of increasing the dry-wet working condition switching limit temperature.

[0037] It should be understood that, in other embodiments, the first flow regulating unit and the second flow regulating unit may also be implemented as other air volume regulating elements, and this application does not specifically limit this.

[0038] The fin-tube heat exchanger 20 of the present application utilizes a fin-tube heat exchanger with a smaller fin pitch to increase the number of fins and improve heat exchange efficiency. Preferably, the fin pitch of the fin-tube heat exchanger 20 can be set to 2.3 mm or less to ensure heat exchange capacity under dry conditions. The fin-tube heat exchanger 20 has an inlet and an outlet. The inlet can be connected to the exterior of the housing 12 for the inflow of hot fluid, and the outlet can be connected to the exterior of the housing 12 for the outflow of fluid cooled by the evaporative condensing unit 10. The heat of the evaporative condensing unit 10 comes from the fin-tube heat exchanger 20, and the heat of the fin-tube heat exchanger 20 comes from the hot fluid flowing into the fin-tube heat exchanger 20, that is, the hot fluid flowing into the fin-tube heat exchanger 20 will transfer heat to the fin-tube heat exchanger 20; under dry conditions, the fin-tube heat exchanger 20 exchanges heat with the external air (cold air) to take away the heat from the hot fluid through the external air, so that the hot fluid is cooled into a cold fluid; under wet conditions, the first water distributor 16 sprays the first spray water (cold water) to the fin-tube heat exchanger 20, and a large amount of liquid film is formed on the surface of the fin-tube heat exchanger 20. The liquid film exchanges heat with the fin-tube heat exchanger 20, so that the fin-tube heat exchanger 20 is cooled down, thereby taking away the heat from the hot fluid and cooling the hot fluid into a cold fluid.

[0039] Under wet conditions, the first water distributor 16 connected to the second water storage tank 26 will spray the first spray water (cold water) to the fin-tube heat exchanger 20, and the first spray water (high-temperature water) after heat exchange will flow into the first water storage tank 24. The second water distributor 18 connected to the first water storage tank 24 will spray the second spray water (high-temperature water) to the packing 22. The external air (hot air) flowing to the packing 22 will exchange heat with the second spray water sprayed to the packing 22 by the second water distributor 18, so that the second spray water undergoes direct evaporation cooling and becomes low-temperature water. The second spray water (cold water) after heat exchange will flow into the first water storage tank 24, thereby realizing the recycling of water in the evaporative condensing unit 10, and ensuring that the first water distributor 16 can continuously spray cold water to the fin-tube heat exchanger 20 under wet conditions, thereby ensuring that the fin-tube heat exchanger 20 can completely rely on cold water to meet the heat exchange requirements under wet conditions.

[0040] In the illustrated embodiment, the first water distributor 16 is arranged above the fin-tube heat exchanger 20, and the second water distributor 18 is arranged above the filler 22; the first water storage tank 24 and the second water storage tank 26 are both arranged at the bottom of the casing 12, and the first water storage tank 24 is arranged corresponding to the fin-tube heat exchanger 20, so that the first spray water after heat exchange can automatically fall into the first water storage tank 24 under the action of its own gravity, and the second water storage tank 26 is arranged corresponding to the filler 22, so that the second spray water after heat exchange can automatically fall into the second water storage tank 26 under the action of its own gravity. Furthermore, the first water tank 24 is connected to the second water distributor 18 through a first water pipe 36, and a first water pump 38 is provided on the first water pipe 36. The first water pump 38 is used to guide the water in the first water tank 24 to the second water distributor 18 through the first water pipe 36; the second water tank 26 is connected to the first water distributor 16 through a second water pipe 40, and a second water pump 42 is provided on the second water pipe 40. The second water pump 42 is used to guide the water in the second water tank 26 to the first water distributor 16 through the second water pipe 40.

[0041] It should be understood that in other embodiments, the first water distributor 16 may also be provided at other positions in the casing 12, for example, the first water distributor 16 is provided on the side of the fin-tube heat exchanger 20 (such as the left side or the right side), or the first water distributor 16 is provided below the fin-tube heat exchanger 20, and the present application does not specifically limit this; when the setting position of the first water distributor 16 in the casing 12 changes, the first water storage tank 24 can be adaptively adjusted as needed to fully recover the first spray water after heat exchange.

[0042] Similarly, the second water distributor 18 can also be arranged at other positions in the casing 12, for example, the second water distributor 18 is arranged on the side of the filler 22 (such as the left side or the right side), or the second water distributor 18 is arranged below the filler 22. This application does not specifically limit this; when the setting position of the second water distributor 18 in the casing 12 changes, the second water storage tank 26 can be adaptively adjusted as needed to fully recover the second spray water after heat exchange.

[0043] In some embodiments, the evaporative condensing unit 10 further includes a water supply pump. When the water in the first water tank 24 and the second water tank 26 is less than a preset standard amount, the water supply pump starts to add water to the first water tank 24 and the second water tank 26 .

[0044] In the embodiment shown, the filler 22 is disposed in the middle of the housing 12. The sidewalls of the housing 12 are provided with a first mounting opening 44 and a second mounting opening 46 in sequence along a first direction. The first direction refers to the direction of gravity, i.e., vertically downward. Figure 1 As shown, a first mounting opening 44 and a second mounting opening 46 located below the first mounting opening 44 are provided on the side wall of the housing 12. The first automatic damper 32 is disposed within the first mounting opening 44. The fin-tube heat exchanger 20 is disposed inside the first mounting opening 44 and adjacent to the filler 22. The height of the fin-tube heat exchanger 20 is comparable to that of the first mounting opening 44. The second automatic damper 34 is disposed within the second mounting opening 46. More specifically, opposing walls of the first mounting opening 44, such as the upper and lower walls of the first mounting opening 44, extend horizontally outwardly of the housing 12 by a predetermined distance, forming the first air passage 28. Opposing walls of the second mounting opening 46, such as the upper and lower walls of the second mounting opening 46, extend horizontally outwardly of the housing 12 by a predetermined distance, forming the second air passage 30 between the second mounting opening 46 and the bottom of the filler 22.

[0045] Multiple fin-tube heat exchangers 20 can be provided based on specific design requirements. Each of the multiple fin-tube heat exchangers 20 is disposed on the sidewalls of the housing 12. Correspondingly, the associated components and structures connected and functionally associated with the fin-tube heat exchangers 20, such as the first automatic air valve 32, the second automatic air valve 34, the first water distributor 16, and the first water storage tank 24, are provided in the same number as the fin-tube heat exchangers 20 and are arranged accordingly according to the aforementioned structural positional relationships. In this embodiment, two fin-tube heat exchangers 20 are provided, symmetrically disposed on opposite sidewalls of the housing 12. The two first water storage tanks 24 are connected by a pipe.

[0046] The two automatic air valves of the evaporative condensing unit 10 of the present application cooperate to adjust the gas flow path. In the dry working condition, the first automatic air valve 32 is fully opened, the second automatic air valve 34 is fully closed, and the spray system stops working. At this time, the ambient low-temperature air completely passes through the fin-tube heat exchanger 20, taking away the heat from the hot fluid, and cooling the hot fluid into a cold fluid. In the wet working condition, the first automatic air valve 32 is fully closed, the second automatic air valve 34 is fully opened, and the ambient low-temperature air completely passes through the second automatic air valve 34 into the unit and flows through the packing 22. At the same time, the spray system starts working, and a large amount of liquid film is attached to the surface of the fin-tube heat exchanger 20. The liquid film exchanges heat with the fin-tube heat exchanger 20, causing the fin-tube heat exchanger 20 to cool down, thereby taking away the heat from the hot fluid, and cooling the hot fluid into a cold fluid.

[0047] Under wet conditions, the first water tank 24 recovers the first spray water after heat exchange. Therefore, the water temperature in the first water tank 24 is relatively high. The high-temperature water in the first water tank 24 is transported to the second water distributor 18 and sprayed onto the packing 22. Direct evaporative cooling occurs within the packing 22, turning it into low-temperature water and storing it in the second water tank 26. The low-temperature water in the second water tank 26 is then transported to the first water distributor 16 and sprayed onto the fin-tube heat exchanger 20 to achieve heat exchange and cooling. At this time, the second automatic air valve 34 is fully opened, allowing external hot air to enter from the bottom of the packing 22 through the second air channel 30, promoting direct evaporative cooling of the second spray water within the packing 22, further reducing the water temperature and improving heat exchange efficiency. This also prevents excessive air resistance at the coils of the fin-tube heat exchanger 20, preventing the cross-flow of air from acting on the spray water and making it difficult to form a liquid film, as the cooling of the coils now relies entirely on the cold water.

[0048] In this embodiment, the dry-wet working condition switching limit temperature can be increased to 10°C, for example. Compared with the traditional evaporative condenser that stops spraying when the ambient temperature reaches 5°C, the condensing unit 10 of the present application can effectively increase the dry-wet working condition switching limit temperature through automatic airflow adjustment, fully utilize the cooling capacity of the sensible heat part in the external air, thereby improving the system energy efficiency and saving water resources.

[0049] In the illustrated embodiment, a filter can be disposed between the fan 14 and the first water distributor 16 to filter particulate matter from the air entering the housing 12, preventing large debris from entering the cavity of the housing 12 and causing contamination. A water collector can be disposed between the filter and the first water distributor 16 to collect particulate droplets from the air flowing out of the housing 12, thereby preventing water loss within the unit.

[0050] In summary, the present application provides an evaporative condensing unit that can increase the dry-wet working condition switching limit temperature, and adopts a fin-tube heat exchanger with a smaller fin spacing to increase the number of fins of the evaporative condensing unit and improve the heat exchange efficiency of the evaporative condensing unit. Since a first flow regulating unit is set between the fin-tube heat exchanger and the external environment, and a second flow regulating unit is set between the filler and the external environment, the evaporative condensing unit solves the heat exchange requirements under dry and wet working conditions by automatically adjusting the air flow. Under dry working conditions, the expanded area of ​​the fins is used to increase the heat exchange area between the evaporative condensing unit and the air, strengthen the heat exchange between the air and the hot fluid, and improve the heat exchange capacity. Under wet working conditions, the heat of the fin-tube heat exchanger is completely removed by spraying water, thereby removing the heat of the hot fluid. By adjusting the air flow, the air flow flowing through the fin-tube heat exchanger is reduced during spraying, so that no external air flows through the fin-tube heat exchanger, thereby avoiding excessive air resistance caused by adding fins, and avoiding increasing the system resistance during spraying. The automatic adjustment of the air flow rate under dry and wet working conditions can give full play to the performance of the fin-tube heat exchanger, ultimately achieving the effect of raising the dry and wet working condition switching limit temperature, improving the system energy efficiency, and saving water resources.

[0051] The concepts described herein may be embodied in other forms without departing from their spirit and characteristics. The specific embodiments disclosed are to be considered illustrative rather than restrictive. Therefore, the scope of this application is to be determined by the appended claims, not by the preceding description. Any changes within the literal meaning and range of equivalents of the claims are intended to be within the scope of these claims.

Claims

1. An evaporative condensing unit capable of increasing the dry-wet operating condition switching limit temperature, characterized in that: include: The fin-tube heat exchanger has a first air passage formed between it and the external environment. The first air passage is provided with a first flow regulating unit for automatically regulating the flow of external air to the fin-tube heat exchanger. The first flow regulating unit includes a first automatic air valve. A second air passage is formed between the filler and the external environment, and a second flow regulating unit is provided in the second air passage for automatically regulating the flow of external air to the filler, and the second flow regulating unit includes a second automatic air valve; a first water distributor, for spraying first spray water to the fin-tube heat exchanger under wet conditions; a second water distributor, for spraying second spray water to the filler under wet conditions; as well as The water storage container includes a first water storage tank and a second water storage tank; the first water storage tank is used to recover the first spray water after heat exchange, and the first water storage tank is connected to the second water distributor to supply water thereto; The second water storage tank is used to recover the second spray water after heat exchange, and the second water storage tank is connected to the first water distributor to supply water thereto.

2. The evaporative condensing unit capable of increasing the dry-wet working condition switching limit temperature according to claim 1, characterized in that: Under dry conditions, the first automatic air valve is fully opened and the second automatic air valve is fully closed; under wet conditions, the first automatic air valve is fully closed and the second automatic air valve is fully opened.

3. The evaporative condensing unit capable of increasing the dry-wet working condition switching limit temperature according to claim 1, characterized in that: Also includes: casing; the filler is arranged in the casing, and a first mounting port and a second mounting port are sequentially provided on the side wall of the casing along a first direction; the first automatic air valve is arranged in the first mounting port, the fin-tube heat exchanger is arranged on the inner side of the first mounting port and adjacent to the filler, and the second automatic air valve is arranged in the second mounting port.

4. The evaporative condensing unit capable of increasing the dry-wet working condition switching limit temperature according to claim 3, characterized in that: The opposite side walls of the first mounting opening extend a preset distance outside the casing respectively, and the first mounting opening forms the first air channel; the opposite side walls of the second mounting opening extend a preset distance outside the casing respectively, and the second air channel is formed between the second mounting opening and the bottom of the filler.

5. The evaporative condensing unit capable of increasing the dry-wet working condition switching limit temperature according to claim 3, characterized in that: The first water distributor is arranged on one side of the fin-tube heat exchanger, and the second water distributor is arranged on one side of the packing; the first water storage tank and the second water storage tank are both arranged at the bottom of the casing, and the first water storage tank is arranged corresponding to the fin-tube heat exchanger, and the second water storage tank is arranged corresponding to the packing.

6. The evaporative condensing unit capable of increasing the dry-wet working condition switching limit temperature according to claim 3, characterized in that: Also includes: Fan; The fan is arranged on the top of the casing and is used to provide power for the air flow in the casing.

7. The evaporative condensing unit capable of increasing the dry-wet working condition switching limit temperature according to claim 1, characterized in that: The fin-tube heat exchanger is provided in plurality, and the number of the first automatic air valve, the second automatic air valve and the first water storage tank is set to be the same as the number of the fin-tube heat exchanger.

8. The evaporative condensing unit capable of increasing the dry-wet working condition switching limit temperature according to claim 1, characterized in that: The first water storage tank is connected to the second water distributor via a first water pipe, and the first water pipe is provided with a first water pump; The second water storage tank is connected to the first water distributor through a second water pipe, and the second water pipe is provided with a second water pump.

9. The evaporative condensing unit capable of increasing the dry-wet working condition switching limit temperature according to claim 3, characterized in that: Also includes: a filter, the filter being used to filter particulate matter in the air entering the housing; a water collector, the water collector being used to collect particulate droplets in the air flowing out of the housing; A water replenishment pump is used to replenish water into the first water storage tank and the second water storage tank.

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