A multi-stage cooling evaporative condenser unit

Abstract

The application provides a multi-stage cooling evaporative condensing unit, wherein the third cooling coil is cooled by the spray water sprayed by a first water distributor, the water temperature of the part of the spray water after passing through the third cooling coil is still low, the water is recycled to a water storage container to cool the first cooling coil, the second cooling coil is cooled by the cold air produced by heat exchange of a heat exchange core, the part of the cold air heated by the second cooling coil flows to the third cooling coil, which helps the spray water in the third cooling coil to evaporate and absorb heat, further improving the cooling effect, the cold water produced by the heat exchange core is recycled to the first water distributor to cool the third cooling coil. The application fully and reasonably utilizes the cold energy produced by the unit itself, adopts three-stage cooling coils to cool the heat source in three stages, greatly improves the heat exchange capacity of the unit, and further improves the upper limit of the application temperature of the unit, expands the temperature range of the unit, and expands the application range of the unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a multi-stage cooling evaporative condensing unit. BACKGROUND

[0002] Humid enthalpy is a kind of renewable natural energy that is easy to obtain. Evaporative cooling technology utilizes the humid enthalpy in air to achieve air cooling and cold water preparation through heat and mass exchange between water and air, and is an environmentally friendly, efficient and economical refrigeration method. That is, evaporative cooling technology is a kind of refrigeration technology using renewable energy.

[0003] The traditional evaporative condensing unit has the effects of energy saving and emission reduction, but in the process of use, there are many problems such as low utilization rate of cold source, low upper limit of applicable temperature, insufficient heat exchange capacity in high temperature environment and the like. For example, the low-temperature air after evaporative cooling is directly discharged to the atmospheric environment, and its cold energy is wasted; the cold water after spraying is heated by the condenser, but its temperature is still low, and the cold energy of this part of cold water is not effectively utilized, so that the utilization rate of cold source is low. Due to the failure to fully utilize the cold energy generated in the heat exchange process, the heat exchange capacity of the traditional evaporative condensing unit is insufficient in high temperature environment, the upper limit of the applicable temperature is low, and the wide promotion of the energy-saving facility is also limited. SUMMARY

[0004] Therefore, the present application provides a multi-stage cooling evaporative condensing unit. Compared with the traditional evaporative condensing unit, the multi-stage cooling evaporative condensing unit of the present application can fully utilize the sensible heat part of the low-temperature air and the sprayed water generated by itself, improve the heat exchange capacity of the unit, and thus improve the upper limit of the applicable temperature of the unit and expand the temperature range of the use of the unit.

[0005] The present application provides a multi-stage cooling evaporative condensing unit, comprising:

[0006] A first cooling module, comprising a first cooling coil, the first cooling coil having an inlet end for a heat fluid to flow in;

[0007] A water storage container, the first cooling coil being at least partially immersed in the water storage container to utilize the cold water in the water storage container to cool the first cooling coil;

[0008] A second cooling module, comprising a second cooling coil and a heat exchange core, the first cooling coil being in communication with the second cooling coil, and the heat exchange core being used to generate cold air to cool the second cooling coil and to generate cold water to flow into the water storage container;

[0009] a third cooling module, comprising a third cooling coil and a first water distributor, the second cooling coil is in communication with the third cooling coil, and the third cooling coil has an outlet end for the cold fluid to flow out, and the first water distributor sprays water to cool the third cooling coil and then flows into the water storage container;

[0010] The water storage container is in communication with the first water distributor to supply water to the first water distributor;

[0011] The hot fluid flowing in through the inlet end is first cooled in the first cooling coil, then flows into the second cooling coil for second cooling, and then flows into the third cooling coil for third cooling to become cold fluid, and flows out through the outlet end.

[0012] In an embodiment, the heat exchange core comprises a second water distributor, and the water storage container is also in communication with the second water distributor to supply water to the second water distributor.

[0013] In an embodiment, the water storage container comprises a first water storage tank and a second water storage tank; the water sprayed by the first water distributor to cool the third cooling coil flows into the second water storage tank, the cold water generated by the heat exchange core flows into the first water storage tank, and the first cooling coil is at least partially immersed in the second water storage tank to cool the first cooling coil by using the cold water in the second water storage tank; the first water storage tank is in communication with the first water distributor to supply water to the first water distributor, and the second water storage tank is in communication with the second water distributor to supply water to the second water distributor.

[0014] In an embodiment, further comprising: a cabinet; the first water distributor, the third cooling coil, the second cooling coil, and the first cooling coil are sequentially arranged in the cabinet along a first direction, the heat exchange core is arranged on a side wall of the cabinet to exchange heat with external hot air, the second cooling coil is arranged close to the heat exchange core, the second water storage tank is arranged at the bottom of the cabinet corresponding to the third cooling coil, and the first water storage tank is arranged at the bottom of the cabinet corresponding to the heat exchange core.

[0015] In an embodiment, the second cooling coil is arranged in multiple groups, and each group of the second cooling coil is configured with a heat exchange core.

[0016] In an embodiment, further comprising: a fan, a filter screen, and a water collector; the fan, the filter screen, the water collector, the first water distributor, the third cooling coil, the second cooling coil, and the first cooling coil are sequentially arranged in the cabinet along a first direction.

[0017] In an embodiment, a first water pump is arranged between the first water storage tank and the first water distributor;

[0018] A second water pump is arranged between the second water storage tank and the second water distributor.

[0019] In an embodiment, the heat exchange core comprises a plurality of heat exchange units arranged in sequence along a horizontal direction; each of the heat exchange units comprises a dry channel and a wet channel which are in communication with each other, the second water distributor is arranged in the wet channel, the dry channel is provided with an air inlet for external hot air to flow in, the wet channel is provided with an air outlet for cold air generated to flow out and a liquid outlet for cold water generated to flow out, the cold air flowing out through the air outlet is used to cool the second cooling coil, and the cold water flowing out through the liquid outlet flows into the water storage container.

[0020] In an embodiment, the dry channel and the wet channel extend along a gravity direction.

[0021] In an embodiment, a wall surface of the wet channel is attached with a liquid film which moves downward under the action of gravity; and the cavity of the wet channel is distributed with liquid droplets which move downward under the action of gravity and air flow.

[0022] In an embodiment, a second partition plate is arranged between the dry channel and the wet channel.

[0023] The second partition plate is a flat plate, a corrugated plate or a concave-convex checkboard plate.

[0024] In summary, the multi-stage cooling evaporative condensing unit provided by the application uses the spray water sprayed by the first water distributor to cool the third cooling coil, the water temperature of the spray water is still low after passing through the third cooling coil, and the spray water is recycled to the water storage container to cool the first cooling coil, the cold air generated by the heat exchange core is used to cool the second cooling coil, the cold air is heated by the second cooling coil and then flows to the third cooling coil, which helps the spray water at the third cooling coil to evaporate and absorb heat, further improving the cooling effect, and the cold water generated by the heat exchange core is recycled to the first water distributor to cool the third cooling coil. The application fully and reasonably utilizes the cold energy generated by the evaporative cooling of the unit itself, uses three-stage cooling coils to cool the heat source in three stages, greatly improves the heat exchange capacity of the unit, and further improves the upper limit of the application temperature of the unit, expands the application temperature range of the unit, and expands the application range of the unit. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a structural schematic diagram of an exemplary multi-stage cooling evaporative condensing unit of the application.

[0026] Figure 2 FIG. 3 is a structural schematic diagram of an exemplary heat exchange core of the application.

[0027] Figure 3A schematic view of a heat exchange unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] Before the embodiments are described in detail, it should be understood that the application is not limited to the detailed description or the drawings described hereinbelow. The application can be implemented in other ways. Furthermore, it should be understood that the language and terminology used herein are for the purpose of description and not of limitation. The language and terminology used herein should not be construed as limiting the scope of the application. The language and terminology used herein, such as "comprise", "include", "have" and the like, means to include the matters listed after the language and terminology, equivalents thereof, and other additional matters. In particular, when describing "one certain element", the number of the element is not limited to one, and can include a plurality of elements.

[0029] Reference will now be made to Figure 1 As shown in the drawings, the present application provides a multi-stage cooling evaporative condensing unit 10 based on evaporative condensing technology. Compared with conventional evaporative condensing units, the multi-stage cooling evaporative condensing unit 10 of the present application can make full use of the sensible heat in the low-temperature air and the spray water generated by itself, improve the heat exchange capacity of the unit, and thus improve the upper limit of the applicable temperature of the unit and expand the temperature range of the unit.

[0030] Specifically, the multi-stage cooling evaporative condensing unit 10 includes a casing 12, a fan 14, a filter screen 16, a water collector 18, a first-stage cooling module, a second-stage cooling module, a third-stage cooling module, and a water storage container. In the present application, the casing 12 is generally "convex" in shape, but the shape of the casing 12 is not specifically limited in the present application, and in other embodiments, the casing 12 can also be designed in other shapes.

[0031] The first-stage cooling module includes a first cooling coil 20, which has an inlet end 30 (i.e., a first inlet, denoted by the inlet end 30) and a first outlet 32.

[0032] The water storage container, in which the first cooling coil 20 is at least partially immersed to utilize the cold water in the water storage container to cool the first cooling coil 20.

[0033] The second-stage cooling module includes a second cooling coil 22 and a heat exchange core 28. The second cooling coil 22 has a second inlet 34 and a second outlet 36. The first outlet 32 and the second inlet 34 are connected by a first pipeline 42, so that the first cooling coil 20 and the second cooling coil 22 are connected, i.e., the first cooling coil 20 and the second cooling coil 22 are in fluid communication. The heat exchange core 28 is used to generate cold air to cool the second cooling coil 22 and to generate a cold water flow into the water storage container.

[0034] The third cooling module comprises a third cooling coil 24 and a first water distributor 26. The third cooling coil 24 has a third inlet 38 and an outlet end 40 (i.e. a third outlet) for the cold fluid. The second outlet 36 is connected to the third inlet 38 by a second pipeline 44, so that the second cooling coil 22 and the third cooling coil 24 are connected (i.e. in fluid communication) with each other. The first water distributor 26 sprays water to cool the third cooling coil 24, and the cooled water flows into the water storage container.

[0035] The water storage container is connected to the first water distributor 26 to supply water to the first water distributor 26.

[0036] The hot fluid flowing into the inlet end 30 is first cooled by the first cooling coil 20, then cooled by the second cooling coil 22, and then cooled by the third cooling coil 24, and finally cooled into cold fluid and flows out of the outlet end 40. That is, the inlet end 30 can be connected to the outside of the casing 12 to allow the hot fluid to flow in, and the outlet end 40 can be connected to the outside of the casing 12 to output the cold fluid cooled by the multi-stage cooling and evaporative condensing unit 10.

[0037] Further, the heat exchange core 28 comprises a second water distributor 46, and the water storage container is also connected to the second water distributor 46 to supply water to the second water distributor 46.

[0038] The water storage container is connected to the first water distributor 26 and the second water distributor 46 to supply water to the first water distributor 26 and the second water distributor 46, so that the water is recycled in the multi-stage cooling and evaporative condensing unit 10. The water sprayed by the first water distributor 26 to cool the third cooling coil 24 flows into the water storage container and is recycled in the multi-stage cooling and evaporative condensing unit 10, and a liquid film is formed on the outer surface of the third cooling coil 24 during the process. The heat exchange core 28 exchanges heat with external hot air to generate cold air and cold water. The cold air cools the second cooling coil 22, and the cold water flows into the water storage container and is recycled in the multi-stage cooling and evaporative condensing unit 10. The water sprayed by the first water distributor 26 to cool the third cooling coil 24 is still relatively cold, and the cold energy of the water can be further utilized. Therefore, the first cooling coil 20 is at least partially immersed in the water storage container to utilize the cold water in the water storage container to cool the first cooling coil 20.

[0039] The cold air generated by the heat exchange core 28 is heated by the second cooling coil 22 and flows upward to the third cooling coil 24, which helps the water sprayed on the third cooling coil 24 to evaporate and absorb heat, thereby improving the cooling efficiency of the third cooling coil 24.

[0040] In the shown embodiment, the water storage container comprises a first water storage tank 48 and a second water storage tank 50, the spray water sprayed by the first water distributor 26 flows into the second water storage tank 50 after cooling the third cooling coil 24, and the cold water generated by the heat exchange core 28 flows into the first water storage tank 48. The first cooling coil 20 is at least partially immersed in the second water storage tank 50 to cool the first cooling coil 20 by using the cold water in the second water storage tank 50. The first water storage tank 48 is communicated with the first water distributor 26 through a first water guide pipe 52 to supply water to the first water distributor 26, and the second water storage tank 50 is communicated with the second water distributor 46 through a second water guide pipe 54 to supply water to the second water distributor 46. A first water pump 56 is arranged on the first water guide pipe 52, and the first water pump 56 is used to guide the water in the first water storage tank 48 to the first water distributor 26 through the first water guide pipe 52; a second water pump 58 is arranged on the second water guide pipe 54, and the second water pump 58 is used to guide the water in the second water storage tank 50 to the second water distributor 46 through the second water guide pipe 54.

[0041] The fan 14, the filter screen 16, the water collector 18, the first water distributor 26, the third cooling coil 24, the second cooling coil 22, and the first cooling coil 20 are arranged in the first direction in the casing 12 in sequence, and the heat exchange core 28 is arranged adjacent to (close to) the second cooling coil 22; wherein the first direction refers to the direction of gravity, i.e. vertically downward.

[0042] In the shown embodiment, the filter screen 16, the water collector 18, the first water distributor 26, the third cooling coil 24, the second cooling coil 22, and the first cooling coil 20 are arranged in the casing 12 in sequence from top to bottom; the fan 14 is arranged at the top of the casing 12, and the fan 14 can provide power to drive the air inside the casing 12 to flow, i.e. the fan 14 can forcibly make the air in the casing 12 flow quickly by drawing air upward, so as to accelerate heat exchange and accelerate the evaporation of water on the outer surfaces of the cooling coils to have a certain cooling effect. The filter screen 16 has a filtering function to prevent large-size sundries from falling into the casing 12 to cause pollution. The air flowing upward in the casing 12 carries with it particulate water droplets, and the water collector 18 is used to prevent the particulate water droplets from being carried away by the air flowing upward to avoid the loss of water in the unit. The heat exchange core 28 is arranged on the side wall of the casing 12 to exchange heat with the external hot air to generate cold water and cold air, and the second cooling coil 22 is arranged adjacent to (close to) the heat exchange core 28 to facilitate the cold air generated by the heat exchange core 28 to flow to the second cooling coil 22 to cool it. The water storage container is arranged at the bottom of the casing 12.

[0043] Preferably, the second cooling coil 22 can be provided with multiple sets according to actual application needs, and each set of the second cooling coil 22 is configured with a heat exchange core 28. In the embodiment, the second cooling coil 22 is provided with two sets, and correspondingly, the heat exchange core 28 is provided with two. The two heat exchange cores 28 are respectively arranged at the "convex" corner portions of the cabinet 12, and a part of the heat exchange core 28 is exposed outside the cabinet 12 to receive external hot air for heat exchange, and the other part is located inside the cabinet 12 to guide the output cold air to the second cooling coil 22 and the cold water to the first water storage tank 48.

[0044] In the embodiment shown, the second water storage tank 50 is arranged at the middle position of the bottom of the cabinet 12 and corresponds to the third cooling coil 24, so that the spray water sprayed by the first water distributor 26 falls into the second water storage tank 50 under the action of its own gravity after cooling the third cooling coil 24. The first water storage tank 48 includes two parts, which are respectively arranged at the bottom of the cabinet 12 at the two side areas of the second water storage tank 50, and correspond to the bottom of the two heat exchange cores 28 respectively, so that the cold water produced by the heat exchange core 28 can directly fall into the corresponding part of the first water storage tank 48 under the action of its own gravity, and the two parts of the first water storage tank 48 are communicated through the connecting pipeline 60.

[0045] In the embodiment shown, two first partitions 62 are arranged at the bottom of the cabinet 12, and the two first partitions 62 divide the bottom area of the cabinet 12 into the second water storage tank 50 located in the middle area and the first water storage tank 48 located in the two side areas.

[0046] In the embodiment, the heat exchange core 28 is a counter-flow dew point heat exchange core, and cold water and cold air close to dew point temperature can be obtained after heat exchange. The counter-flow dew point evaporation cooling can produce lower temperature cold water and cold air, improve the heat exchange capacity of the unit, improve the upper limit of the applicable temperature of the unit, and expand the applicable temperature range of the unit. Specifically, please refer to Figure 2 and Figure 3 , the heat exchange core 28 includes a plurality of heat exchange units 64, and the plurality of heat exchange units 64 are arranged in sequence along the horizontal direction. Specifically, the plurality of heat exchange units 64 can be arranged in sequence along the horizontal direction and in parallel. It should be understood that the plurality of heat exchange units 64 can also be arranged in sequence along the horizontal direction but not in parallel, that is, there is an included angle between the heat exchange unit 64 and another heat exchange unit 64, which is not limited.

[0047] Each heat exchange unit 64 comprises dry channels 66 and wet channels 68 which are in communication with each other, the second water distributor 46 is arranged in the wet channels 68, the dry channels 66 are provided with air inlets 70 for the inflow of external hot air, the wet channels 68 are provided with air outlets 72 for the outflow of generated cold air and liquid outlets 74 for the outflow of generated cold water, the cold air flowing out of the air outlets 72 is used to cool the second cooling coil 22, and the cold water flowing out of the liquid outlets 74 flows into the water storage container.

[0048] In the shown embodiment, each heat exchange unit 64 comprises dry channels 66 and wet channels 68 which are arranged in parallel along the horizontal direction and in communication with each other, the dry channels 66 and the wet channels 68 both extend along the gravity direction, i.e. along the vertical direction. The dry channels 66 and the wet channels 68 are in communication at the top ends, the bottom end of the dry channels 66 is provided with air inlets 70 for the inflow of hot air, and the bottom end of the wet channels 68 is provided with air outlets 72 for the outflow of cold air and liquid outlets 74 for the outflow of cold water. The second water distributor 46 is arranged in the wet channels 68, and the second water distributor 46 is used to spray water into the wet channels 68. It should be understood that in other embodiments, some heat exchange units 64 can also use fillers, which will not be described or limited in detail here.

[0049] In this application, the hot air entering the heat exchange core 28 is low-humidity high-temperature ambient air, which is exchanged with the water sprayed by the second water distributor 46 in the wet channels 68 to produce high-humidity low-temperature air and low-temperature water. The specific heat exchange principle is that the hot air enters the dry channels 66 from the air inlets 70, and then flows into the wet channels 68 from the top end. The second water distributor 46 sprays water into the wet channels 68, part of the sprayed water forms water mist, and part of the sprayed water forms liquid film attached to the wall surface of the wet channels 68. The water mist evaporates to absorb heat from the air, and the liquid film on the wall surface of the wet channels 68 can cool the air in the dry channels 66 and the wet channels 68 at the same time.

[0050] In the shown embodiment, the heat exchange unit 64 comprises an outer shell 76 which is in the shape of a rectangular parallelepiped, a second partition plate 78 is arranged between the front and rear walls in the outer shell 76, the second partition plate 78 and the left and right walls of the outer shell 76 form the dry channels 66 and the wet channels 68 respectively, and the top end of the second partition plate 78 and the top wall of the outer shell 76 have a spacing distance, and the spacing area forms a communication port 80 of the dry channels 66 and the wet channels 68. The second water distributor 46 is inserted into the outer shell 76 along the front and rear directions, and the front end of the second water distributor 46 is exposed outside the outer shell 76 for the injection of circulating water into the second water distributor 46.

[0051] The second partition plate 78 can be selected as a flat plate, a corrugated plate, a concave-convex diamond plate or other forms of reinforced heat exchange units to enhance the heat exchange efficiency between the dry channels 66 and the wet channels 68. The second partition plate 78 is preferably a corrugated plate or a concave-convex diamond plate, which can disturb the heat exchange boundary layer and increase the heat exchange surface area at the same time.

[0052] Preferably, the second water distributor 46 is arranged in the wet channel 68 at a position communicating with the dry channel 66, for example, the second water distributor 46 is arranged at a middle position in the horizontal direction of the wet channel 68, and the top end of the second water distributor 46 is flush with the top end of the second partition plate 78, so as to facilitate the second water distributor 46 to spray water into the whole wet channel 68, increase the water coverage area, and improve the heat exchange efficiency. Of course, the present application does not limit the arrangement position of the second water distributor 46, and in other embodiments, the second water distributor 46 can also be arranged at other positions in the wet channel 68.

[0053] In a preferred embodiment, the second water distributor 46 is arranged to simultaneously spray water mist and water stream into the wet channel 68, wherein the sprayed water mist can increase the contact surface area of water and air, and help to enhance evaporation and heat exchange; the sprayed water stream is used to form liquid film 82 on the wall surface of the wet channel 68, and help to cool the air in the dry channel 66. For example, the liquid film 82 on the left wall surface in the wet channel 68 can cool the air in the dry channel 66 of the heat exchange unit 64 where the liquid film 82 is located, and the liquid film 82 on the right wall surface in the wet channel 68 can cool the air in the dry channel 66 of the adjacent heat exchange unit 64, so as to improve the heat exchange efficiency.

[0054] The second water distributor 46 causes the wall surface in the wet channel 68 to adhere to the liquid film 82, and the liquid film 82 moves downward under the action of gravity. The water mist and water stream sprayed by the second water distributor 46 form liquid droplets 84 of different sizes in the wet channel 68, and the liquid droplets 84 move downward under the action of gravity and air flow, and flow out of the liquid outlet 74 and fall into the first water storage tank 48 under the action of gravity.

[0055] In the shown embodiment, the air inlet 70 is arranged at the bottom side of the front surface of the heat exchange core 28, that is, the air inlet 70 is arranged at the bottom side of the portion of the heat exchange core 28 located outside the shell 12, so as to facilitate the external hot air to enter from the air inlet 70. The air outlet 72 is arranged at the bottom side of the rear surface of the heat exchange core 28, that is, the air outlet 72 is arranged at the bottom side of the portion of the heat exchange core 28 located inside the shell 12, so as to facilitate the output cold air to flow to the second cooling coil 22. The liquid outlet 74 is arranged on the bottom surface of the heat exchange core 28, so as to facilitate the output cold water to directly fall into the first water storage tank 48. In other embodiments, the air inlet 70, the air outlet 72 and the liquid outlet 74 can also be arranged at other positions of the shell 76.

[0056] The plurality of shells 76 are sequentially and parallelly connected in the horizontal direction to form the shell part of the heat exchange core 28, and the plurality of shells 76 are all of the same size, so that the heat exchange core 28 as a whole has a cuboid shape. The plurality of shells 76 can be separately manufactured or integrally formed.

[0057] Since the heat exchange core 28 of the present application can produce low-temperature water and low-temperature wet air close to the dew point, containing more cold energy, and the cold energy of the low-temperature water is relatively more than that of the low-temperature wet air, the low-temperature water is recovered to the first water storage tank 48 and then delivered to the first water distributor 26 for cooling the third cooling coil 24; the low-temperature wet air with relatively less cold energy is used to cool the second cooling coil 22, and after passing through the second cooling coil 22, the temperature of the low-temperature wet air is increased and the relative humidity is reduced, and then flows to the third cooling coil 24, which can enhance the evaporation of the liquid film at the position of the third cooling coil 24 and enhance the heat exchange. The low-temperature water heated by the third cooling coil 24 still has a relatively low temperature, but the cold energy is relatively less, which is recovered to the second water storage tank 50 for cooling the first cooling coil 20. The gaseous heat fluid G passes through the first cooling coil 20, the second cooling coil 22 and the third cooling coil 24 in turn, and the cold energy gradually increases, and finally the gaseous heat fluid is condensed into liquid cold fluid L.

[0058] In summary, the present application provides a multi-stage cooling evaporative condensing unit, which uses the spray water sprayed by the first water distributor to cool the third cooling coil, and the water temperature of the part of the spray water after passing through the third cooling coil is still low, which is recovered to the water storage container to cool the first cooling coil, and the cold air produced by the heat exchange core is used to cool the second cooling coil, and the part of the cold air heated by the second cooling coil flows to the third cooling coil, which helps the evaporation of the spray water at the third cooling coil and further improves the cooling effect, and the cold water produced by the heat exchange core is recovered and delivered to the first water distributor to cool the third cooling coil. The present application fully and reasonably utilizes the cold energy generated by the evaporative cooling of the unit itself, adopts three-stage cooling coils to cool the heat source in three stages, greatly improves the heat exchange capacity of the unit, and further improves the upper limit of the application temperature of the unit, expands the temperature range of the unit, and expands the application range of the unit.

[0059] It is worth mentioning that for scenes with low heat dissipation requirements, the first cooling coil or the second cooling coil in the multi-stage cooling evaporative condensing unit provided by the present application can be omitted, that is, a two-stage cooling evaporative condensing unit can be made, which can meet the demand while being miniaturized.

[0060] The concepts described herein can be implemented in other forms without departing from the spirit and essential characteristics. The specific embodiments disclosed are to be considered in all respects as illustrative only and not restrictive in nature. Therefore, the scope of the present application is determined by the appended claims rather than the foregoing description. Any changes within the meaning and equivalent range of the claims should be considered within the scope of the claims.

Claims

1. A multi-stage cooling evaporator-condenser unit, characterized in that, include: The first-stage cooling module includes a first cooling coil, which has an inlet end for the inflow of heating fluid. A water storage container, wherein the first cooling coil is at least partially immersed in the water storage container to cool the first cooling coil using the cold water in the water storage container. The second-stage cooling module includes a second cooling coil and a heat exchange core. The first cooling coil is connected to the second cooling coil. The heat exchange core is used to generate cold air to cool the second cooling coil and to generate cold water to flow into the water storage container. The third-stage cooling module includes a third cooling coil and a first water distributor. The second cooling coil is connected to the third cooling coil, and the third cooling coil has an outlet end for supplying cooling fluid. The spray water sprayed by the first water distributor cools the third cooling coil and then flows into the water storage container. The water storage container is connected to the first water distributor to supply water to the first water distributor; The hot fluid flowing in through the inlet end first undergoes first-stage cooling in the first cooling coil, then flows into the second cooling coil for second-stage cooling, and then flows into the third cooling coil for third-stage cooling, cooling into a cold fluid which flows out through the outlet end.

2. The multi-stage cooling evaporator-condenser unit as described in claim 1, characterized in that, The heat exchange core includes a second water distributor, and the water storage container is also connected to the second water distributor to supply water to the second water distributor.

3. The multi-stage cooling evaporator-condenser unit as described in claim 2, characterized in that, The water storage container includes a first water storage tank and a second water storage tank; the spray water from the first water distributor cools the third cooling coil and then flows into the second water storage tank, while the cold water generated by the heat exchange core flows into the first water storage tank. The first cooling coil is at least partially immersed in the second water storage tank to cool it using the cold water in the second water storage tank; the first water storage tank is connected to the first water distributor to supply water to the first water distributor, and the second water storage tank is connected to the second water distributor to supply water to the second water distributor.

4. The multi-stage cooling evaporator-condenser unit as described in claim 3, characterized in that, Also includes: The casing includes a first water distributor, a third cooling coil, a second cooling coil, and a first cooling coil arranged sequentially along a first direction within the casing. The heat exchange core is disposed on the side wall of the casing to exchange heat with external hot air. The second cooling coil is disposed close to the heat exchange core. The second water storage tank is disposed at the bottom of the casing, corresponding to the third cooling coil. The first water storage tank is disposed at the bottom of the casing, corresponding to the heat exchange core.

5. The multi-stage cooling evaporator-condenser unit as described in claim 4, characterized in that, The second cooling coil is provided in multiple groups, and each group of the second cooling coil is equipped with one heat exchange core.

6. The multi-stage cooling evaporator-condenser unit as described in claim 4, characterized in that, Also includes: A fan, a filter screen, and a water collector; the fan, the filter screen, the water collector, the first water distributor, the third cooling coil, the second cooling coil, and the first cooling coil are arranged sequentially in the housing along a first direction.

7. The multi-stage cooling evaporator-condenser unit as described in claim 3, characterized in that, A first water pump is provided between the first water storage tank and the first water distributor; A second water pump is provided between the second water storage tank and the second water distributor.

8. The multi-stage cooling evaporator-condenser unit as described in any one of claims 2-7, characterized in that, The heat exchange core includes several heat exchange units arranged sequentially along a horizontal direction; each heat exchange unit includes a dry channel and a wet channel that are interconnected. The second water distributor is disposed in the wet channel. The dry channel is provided with an air inlet for external hot air to flow in, and the wet channel is provided with an air outlet for generated cold air to flow out and a liquid outlet for generated cold water to flow out. The cold air flowing out through the air outlet is used to cool the second cooling coil, and the cold water flowing out through the liquid outlet flows into the water storage container.

9. The multi-stage cooling evaporator-condenser unit as described in claim 8, characterized in that, Both the dry channel and the wet channel extend along the direction of gravity.

10. The multi-stage cooling evaporator-condenser unit as described in claim 9, characterized in that, The wall of the wet channel is coated with a liquid film, which moves downward under the action of gravity; the cavity of the wet channel contains droplets, which move downward under the action of gravity and airflow.

11. The multi-stage cooling evaporator-condenser unit as described in claim 8, characterized in that, A second partition is provided between the dry channel and the wet channel; The second partition is a flat plate, a corrugated plate, or a twill plate.

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