A terminal of a chilled beam air conditioning system

Abstract

The present invention discloses a terminal of a chilled beam air conditioning system, which includes a static pressure box, at least two heat exchange boxes, multiple rows of nozzles and at least two heat exchangers, wherein the static pressure box is provided with an air inlet; each of the heat exchange boxes is arranged side by side and at intervals directly below the static pressure box, its upper surface is open, and its bottom surface is provided with multiple air inlet holes; each row of the nozzles is arranged between the static pressure box and each of the heat exchange boxes, its inlet end is connected to the static pressure box, and its outlet end is downward; each of the heat exchangers is respectively arranged in the corresponding heat exchange box. The beneficial effect of the present invention is that since each water inlet is provided on each curved section of the serpentine bend pipe, the flow direction of the chilled water entering the heat exchange pipe is changed, and the two water flows merge into one water flow, resulting in water flow impact, which destroys the fluid flow boundary layer, aggravates the fluid turbulence state, and thus enhances the heat exchange effect between the chilled water and the indoor air.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning equipment, and in particular to a terminal of a chilled beam air-conditioning system. Background Art

[0002] A chilled beam air conditioning system is an induction radiant cooling system with dry-condition fan coil units, combining energy efficiency and comfort. The system features no fans at the end of the chilled beam, and independent temperature and humidity control, resulting in excellent comfort and energy efficiency.

[0003] When an existing chilled beam air conditioning system terminal (such as the active chilled beam air conditioning terminal disclosed in application number 202011176624.0) is in use, primary fresh air (outdoor air processed by the chilled beam air conditioning system unit) is drawn into the static pressure chamber by a fan. The fresh air in the static pressure chamber is ejected at high speed through the left and right nozzles, creating negative pressure at the openings on the upper surfaces of the left and right boxes, and the inner box. This forces indoor air to enter the left, right, and inner boxes through the holes at the bottoms of the left and right boxes, respectively, where it exchanges heat with the chilled water in the heat exchanger. The heat-exchanged indoor air and primary air mix in the left and right air outlet ducts and are delivered to the room. Because the heat exchange coils of the heat exchanger mostly use a straight tube arrangement and generally have only one water inlet and one water outlet, the heat exchange effect is poor. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a terminal for a chilled beam air-conditioning system to solve the technical problem that the heat exchange coils of the heat exchangers in the prior art mostly adopt a straight tube arrangement structure and generally have only one water inlet and one water outlet, resulting in poor heat exchange effect.

[0005] To achieve the above technical objectives, the technical solution of the present invention provides a chilled beam air conditioning system terminal, comprising:

[0006] A static pressure box having an air inlet formed thereon;

[0007] At least two heat exchange boxes are arranged side by side and spaced apart directly below the static pressure box, with an open upper surface and a plurality of air inlet holes on the bottom surface;

[0008] Multiple rows of nozzles are arranged between the static pressure box and each of the heat exchange boxes, with their inlet ends communicating with the static pressure box and their outlet ends facing downward;

[0009] At least two heat exchangers are respectively arranged in the corresponding heat exchange boxes, which include heat exchange tubes. The heat exchange tubes are serpentine bend structures. Each bend section of the heat exchange tubes is provided with a water inlet. One end of the heat exchange tubes and each of the water inlets are connected to the system water outlet pipeline, and the other end of the heat exchange tubes is connected to the system water inlet pipeline.

[0010] Furthermore, the heat exchanger also includes a water inlet pipeline, one end of the water inlet pipeline is connected to the system water outlet pipeline, and the other end of the water inlet pipeline is connected to one end of the heat exchange tube and each of the water inlets.

[0011] Furthermore, the water inlet pipe includes a main water inlet pipe, a first branch water inlet pipe and a second branch water inlet pipe, one end of the main water inlet pipe is connected to the system water outlet pipe, and the other end of the main water inlet pipe is connected to one end of the heat exchange pipe, the first branch water inlet pipe is arranged on one side of the heat exchange pipe, one end of the first branch water inlet pipe is connected to the main water inlet pipe, a plurality of first water outlets are spaced apart on the first branch water inlet pipe, and each first water outlet is connected to each water inlet in a one-to-one correspondence, the second branch water inlet pipe is arranged on the other side of the heat exchange pipe, one end of the second branch water inlet pipe is connected to the main water inlet pipe, a plurality of second water outlets are spaced apart on the second branch water inlet pipe, and each second water outlet is connected to each water inlet in a one-to-one correspondence.

[0012] Furthermore, the first branch water inlet pipe and the second branch water inlet pipe are perpendicular to each straight section of the heat exchange tube.

[0013] Furthermore, the other end of the first branch water inlet pipe and the other end of the second branch water inlet pipe are both sealed.

[0014] Furthermore, the heat exchanger further includes a water outlet pipe, one end of the water outlet pipe is connected to the other end of the heat exchange pipe, and the other end of the water outlet pipe is connected to the system water inlet pipeline.

[0015] Furthermore, the heat exchanger also includes a plurality of flow guides, each of which is arranged in the heat exchange tube and is located at the corresponding water inlet, so that the chilled water flow flows into the heat exchange tube.

[0016] Furthermore, the guide member includes two guide plates, which are respectively inclined on both sides of the water inlet, one end of the two guide plates is fixed to the heat exchange tube, and the other end of the two guide plates extends along the direction of the chilled water flow.

[0017] Furthermore, the angle between each guide plate on one side of the heat exchange tube and the corresponding first branch water inlet pipe is 45°, and the angle between each guide plate on the other side of the heat exchange tube and the corresponding second branch water inlet pipe is 45°.

[0018] Furthermore, the nozzle is a tapered structure.

[0019] Compared with the prior art, the beneficial effects of the present invention include: when in use, the primary fresh air (outdoor air cooled and dehumidified by the chilled beam air conditioning system unit) is drawn into the static pressure box along the air inlet by the fan, the primary fresh air in the static pressure box is ejected at high speed through each nozzle, and negative pressure is generated at the opening on the upper surface of each heat exchange box, forcing the indoor air to enter the corresponding heat exchange box through each air inlet hole at the bottom of the heat exchange box, and the chilled water cooled by the chilled beam air conditioning system unit enters the system outlet pipe and enters the heat exchange tube along one end of the heat exchange tube and each water inlet. The indoor air entering the heat exchange box exchanges heat with the chilled water in the heat exchange tube for the first time, and exchanges heat with the fresh air ejected from each nozzle for the second time. The mixed air that completes the heat exchange is sent into the room through the gap between adjacent heat exchange boxes. Since each water inlet is opened on each curved section of the serpentine elbow, the flow direction of the chilled water entering the heat exchange tube changes, and the two water flows merge into one water flow, causing water flow impact, destroying the fluid flow boundary layer, aggravating the fluid turbulence state, and thus enhancing the heat exchange effect between the chilled water and the indoor air. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a chilled beam air conditioning system terminal provided by the present invention;

[0021] Figure 2 yes Figure 1 A top view of the terminal end of a chilled beam air conditioning system;

[0022] Figure 3 This is a schematic structural diagram of a heat exchanger at the end of a chilled beam air conditioning system provided by the present invention;

[0023] In the figure: 100 - static pressure box, 110 - air inlet, 200 - heat exchange box, 300 - nozzle, 400 - heat exchanger, 410 - heat exchange tube, 411 - water inlet, 420 - water inlet pipeline, 421 - main water inlet pipe, 422 - first branch water inlet pipe, 4221 - first water outlet, 423 - second branch water inlet pipe, 4231 - second water outlet, 430 - water outlet pipe, 440 - guide member, 441 - guide plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The present invention provides a terminal of a chilled beam air conditioning system, the structure of which is as follows: Figure 1 - Figure 3 As shown, it includes a static pressure box 100, at least two heat exchange boxes 200, multiple rows of nozzles 300 and at least two heat exchangers 400, the static pressure box 100 is provided with an air inlet 110; each of the heat exchange boxes 200 is arranged side by side and spaced directly below the static pressure box 100, its upper surface is open, and its bottom surface is provided with multiple air inlet holes; each row of the nozzles 300 is arranged between the static pressure box 100 and each of the heat exchange boxes 200, and its inlet end is connected to the The static pressure box 100 is connected, and its outlet ends are all facing downward; each heat exchanger 400 is respectively arranged in the corresponding heat exchange box 200, which includes a heat exchange tube 410, and the heat exchange tube 410 is a serpentine bend structure. Each bending section of the heat exchange tube 410 is provided with a water inlet 411, one end of the heat exchange tube 410 and each of the water inlets 411 are connected to the system outlet pipe 430, and the other end of the heat exchange tube 410 is connected to the system water inlet pipe 420.

[0026] During use, fresh air (outdoor air cooled and dehumidified by the chilled beam air conditioning system unit) is drawn into the static pressure box 100 along the air inlet 110 by the fan, and the fresh air in the static pressure box 100 is ejected at high speed through each of the nozzles 300, and generates negative pressure at the openings on the upper surface of each of the heat exchange boxes 200. It can be seen from the Venturi effect that after the high-speed airflow passes through the obstruction, a negative pressure area will be formed near the upper port on the back of the obstruction. The negative pressure area has an adsorption effect, forcing the indoor air to enter the corresponding heat exchange box 200 through each of the air inlet holes at the bottom of the heat exchange box 200, and the chilled water cooled by the chilled beam air conditioning system unit enters the system outlet pipe 430 and flows along the One end of the heat exchange tube 410 and each of the water inlets 411 enter the heat exchange tube 410, and the indoor air entering the heat exchange box 200 undergoes a primary heat exchange with the chilled water in the heat exchange tube 410, and undergoes a secondary heat exchange with the primary fresh air ejected by each of the nozzles 300. The mixed air that has completed the heat exchange is sent into the room through the gap between adjacent heat exchange boxes 200. Since each of the water inlets 411 is opened on each curved section of the serpentine bend, the flow direction of the chilled water entering the heat exchange tube 410 changes, and the two water flows merge into one water flow, causing water flow impact, destroying the fluid flow boundary layer, aggravating the fluid turbulence state, and thereby enhancing the heat exchange effect between the chilled water and the indoor air.

[0027] As a preferred embodiment, please refer to Figure 3 The heat exchanger 400 also includes a water inlet pipe 420, one end of which is connected to the system water outlet pipe 430, and the other end of the water inlet pipe 420 is connected to one end of the heat exchange tube 410 and each of the water inlets 411. The chilled water cooled by the chilled beam air-conditioning system unit enters the system water outlet pipe 430, then enters the water inlet pipe 420, and then enters the heat exchange tube 410 along one end of the heat exchange tube 410 and each of the water inlets 411.

[0028] As a preferred embodiment, please refer to Figure 3 The water inlet pipe 420 includes a main water inlet pipe 421, a first branch water inlet pipe 422 and a second branch water inlet pipe 423. One end of the main water inlet pipe 421 is connected to the system water outlet pipe 430, and the other end of the main water inlet pipe 421 is connected to one end of the heat exchange pipe 410. The first branch water inlet pipe 422 is arranged on one side of the heat exchange pipe 410, and one end of the first branch water inlet pipe 422 is connected to the main water inlet pipe 421. A plurality of first water outlets 4221 are spaced apart on the first branch water inlet pipe 422, and each of the first water outlets 4221 is connected to each of the water inlets 411 in a one-to-one correspondence. The second branch water inlet pipe 423 is arranged on the other side of the heat exchange pipe 410, and one end of the second branch water inlet pipe 423 is connected to the main water inlet pipe 421. A plurality of second water outlets 4231 are spaced apart on the second branch water inlet pipe 423, and each of the second water outlets 4231 is connected to each of the water inlets The water inlets 411 are connected one by one, and the chilled water cooled by the chilled beam air-conditioning system unit enters the system water outlet pipe 430, and then enters the main water inlet pipe 421, the first branch water inlet pipe 422 and the second branch water inlet pipe 423. The chilled water in the main water inlet pipe 421 enters the heat exchange pipe 410 along one end of the heat exchange pipe 410, the chilled water in the first branch water inlet pipe 422 enters the heat exchange pipe 410 along the corresponding water inlets 411, and the chilled water in the second branch water inlet pipe 423 enters the heat exchange pipe 410 along the corresponding water inlets 411. Since each of the water inlets 411 is opened on each curved section of the serpentine bend pipe, the flow direction of the chilled water entering the heat exchange pipe 410 is changed, and the two water flows merge into one water flow, water flow impact occurs, the fluid flow boundary layer is destroyed, the fluid turbulence state is aggravated, and the heat exchange effect between the chilled water and the indoor air is enhanced.

[0029] As a preferred embodiment, please refer to Figure 3The first branch water inlet pipe 422 and the second branch water inlet pipe 423 are perpendicular to the straight sections of the heat exchange tube 410, so that the chilled water in the first branch water inlet pipe 422 and the second branch water inlet pipe 423 can enter the heat exchange tube 410 at a relatively stable flow rate.

[0030] As a preferred embodiment, please refer to Figure 3 One end of the first branch water inlet pipe 422 and one end of the second branch water inlet pipe 423 are both bent pipe structures, and the other end of the first branch water inlet pipe 422 and the other end of the second branch water inlet pipe 423 are both sealed.

[0031] As a preferred embodiment, please refer to Figure 3 The heat exchanger 400 also includes a water outlet pipe 430, one end of which is connected to the other end of the heat exchange pipe 410, and the other end of the water outlet pipe 430 is connected to the system water inlet pipe 420. The chilled water after heat exchange flows into the water outlet pipe 430 and flows back along the system water inlet pipe 420 into the system for freezing treatment.

[0032] As a preferred embodiment, please refer to Figure 3 The heat exchanger 400 also includes a plurality of flow guides 440, each of which is arranged in the heat exchange tube 410 and is located at the corresponding water inlet 411, so that the chilled water flow converges into the heat exchange tube 410, preventing the chilled water from flowing back at the water inlet 411, thereby improving the merging effect of the two streams of chilled water in the heat exchange tube 410.

[0033] As a preferred embodiment, please refer to Figure 3 The guide member 440 includes two guide plates 441, which are respectively arranged obliquely on both sides of the water inlet 411. One end of the two guide plates 441 is fixed to the heat exchange tube 410, and the other ends of the two guide plates 441 extend along the direction of the chilled water flow. The flow direction of the chilled water entering the heat exchange tube 410 along each water inlet 411 changes, and the two water flows merge into one water flow, causing water flow impact, destroying the fluid flow boundary layer, aggravating the fluid turbulence state, and thus enhancing the heat exchange effect between the chilled water and the indoor air.

[0034] As a preferred embodiment, please refer to Figure 3 The angle between each of the guide plates 441 on one side of the heat exchange tube 410 and the corresponding first branch water inlet pipe 422 is 45°, and the angle between each of the guide plates 441 on the other side of the heat exchange tube 410 and the corresponding second branch water inlet pipe 423 is 45°, so as to improve the merging effect of the two streams of chilled water in the heat exchange tube 410.

[0035] As a preferred embodiment, please refer to Figure 1 The nozzle 300 is a tapered structure, and the diameter of the flow channel of the nozzle 300 gradually decreases from the inlet end to the outlet end to improve the jet effect. Each nozzle 300 can freely adjust the degree of opening and closing of the tail end, in order to achieve different air supply volumes and wind speeds according to different needs.

[0036] As a preferred embodiment, please refer to Figure 2 The nozzles 300 in each row are arranged side by side and at intervals along the length direction of the static pressure box 100, and the nozzles 300 in each row are arranged side by side and at intervals along the width direction of the static pressure box 100, thereby increasing the supply of fresh air at the terminal of the equipment and reducing the overall energy consumption of the system. The fresh air is cooled and dehumidified by low-temperature chilled water before entering the static pressure box 100, which not only maintains indoor air circulation, but also exchanges heat with the return air, thereby improving the terminal heat exchange efficiency.

[0037] As a preferred embodiment, please refer to Figure 1 Each of the nozzles 300 is fixedly connected to the bottom surface of the static pressure box 100 to provide support for the nozzle 300.

[0038] As a preferred embodiment, please refer to Figure 1 An air outlet channel is formed between adjacent heat exchange boxes 200, and the mixed air that completes heat exchange is sent into the room through the air outlet channel.

[0039] As a preferred embodiment, the air inlet pipe connected to the air inlet 110 is wrapped with a heat-insulating material to prevent water droplets from condensing on the outer surface of the air inlet pipe connected to the air inlet 110 .

[0040] As a preferred embodiment, the main water inlet pipe 421, the first branch water inlet pipe 422, the second branch water inlet pipe 423 and the outlet pipe 430 are all wrapped with insulation materials to prevent water droplets from condensing on the one hand, and on the other hand to prevent the outlet temperature of the chilled water after heat exchange from being high, causing external convection heat exchange in the outlet pipe 430, thereby affecting the overall heat exchange effect.

[0041] In order to better understand the present invention, the following Figure 1 - Figure 3 The working principle of the technical solution of the present invention is described in detail:

[0042] During use, fresh air (outdoor air cooled and dehumidified by the chilled beam air conditioning system unit) is drawn into the static pressure box 100 along the air inlet 110 by the fan, and the fresh air in the static pressure box 100 is ejected at high speed through each of the nozzles 300, and generates negative pressure at the openings on the upper surface of each of the heat exchange boxes 200. It can be seen from the Venturi effect that after the high-speed airflow passes through the obstruction, a negative pressure area will be formed near the upper port on the back of the obstruction. The negative pressure area has an adsorption effect, forcing the indoor air to enter the corresponding heat exchange box 200 through each of the air inlet holes at the bottom of the heat exchange box 200. The chilled water cooled by the chilled beam air conditioning system unit enters the system water outlet pipe 430, and then enters the main water inlet pipe 421, the first branch water inlet pipe 422 and the second branch water inlet pipe 423. The chilled water in the main water inlet pipe 421 enters the heat exchange pipe 410 along one end of the heat exchange pipe 410. The chilled water in the water inlet pipe 422 enters the heat exchange tube 410 along the corresponding water inlets 411, and the chilled water in the second branch water inlet pipe 423 enters the heat exchange tube 410 along the corresponding water inlets 411. The indoor air entering the heat exchange box 200 undergoes a primary heat exchange with the chilled water in the heat exchange tube 410, and undergoes a secondary heat exchange with the primary fresh air ejected by each nozzle 300. The mixed air that completes the heat exchange is sent into the room through the air outlet channel. The chilled water after heat exchange flows into the water outlet pipe 430 and flows back into the system along the system water inlet pipe 420 for freezing treatment. Since each of the water inlets 411 is opened on each curved section of the serpentine bend pipe, the flow direction of the chilled water entering the heat exchange tube 410 changes, and the two water flows merge into one water flow, water flow impact occurs, the fluid flow boundary layer is destroyed, the fluid turbulence state is aggravated, and the heat exchange effect between the chilled water and the indoor air is enhanced.

[0043] The chilled beam air conditioning system terminal provided by the present invention has the following beneficial effects:

[0044] (1) The two guide plates 441 are tilted and arranged on both sides of the water inlet 411, respectively, so that the chilled water flow can be merged into the heat exchange tube 410, and the chilled water can be prevented from flowing back at the water inlet 411, so as to improve the merging effect of the two streams of chilled water in the heat exchange tube 410. The air inlet pipe connected to the air inlet 110 is wrapped with insulation material to prevent water droplets from condensing on the outer surface of the air inlet pipe connected to the air inlet 110. The main water inlet pipe 421, the first branch water inlet pipe 422, the second branch water inlet pipe 423 and the outlet pipe 430 are all wrapped with insulation material to prevent water droplets from condensing on the one hand and to prevent the outlet temperature of the chilled water after heat exchange from being high on the other hand, so as to prevent the outlet pipe 430 from having external convection heat exchange, thereby affecting the overall heat exchange effect.

[0045] (2) The heat exchange tube 410 adopts a method of connecting multiple water inlets 411 in parallel, which can provide a larger chilled water flow rate than the traditional water supply method, and avoid the chilled water flow rate being too fast when the chilled water flow demand is large, thereby preventing damage to the pipeline caused by impact;

[0046] (3) Since each of the water inlets 411 is opened on each curved section of the serpentine bend, the flow direction of the chilled water entering the heat exchange tube 410 changes, and the two water flows merge into one water flow, causing water flow impact, destroying the fluid flow boundary layer, aggravating the fluid turbulence state, and thus enhancing the heat exchange effect between the chilled water and the indoor air.

[0047] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A chilled beam air conditioning system terminal, characterized in that: include: A static pressure box having an air inlet formed thereon; At least two heat exchange boxes are arranged side by side and spaced apart directly below the static pressure box, with an open upper surface and a plurality of air inlet holes on the bottom surface; Multiple rows of nozzles are arranged between the static pressure box and each of the heat exchange boxes, with their inlet ends communicating with the static pressure box and their outlet ends facing downward; At least two heat exchangers are respectively arranged in the corresponding heat exchange boxes, which include heat exchange tubes and water inlet pipes. The heat exchange tubes are serpentine bend structures. Each bend section of the heat exchange tubes is provided with a water inlet. One end of the heat exchange tubes and each of the water inlets are connected to the system water outlet pipe, and the other end of the heat exchange tubes is connected to the system water inlet pipe. One end of the water inlet pipe is connected to the system water outlet pipe, and the other end of the water inlet pipe is connected to one end of the heat exchange tubes and each of the water inlets. The water inlet pipe includes a main water inlet pipe, a first branch water inlet pipe and a second branch water inlet pipe. One end of the main water inlet pipe is connected to the system water outlet pipe, and the other end of the main water inlet pipe is connected to one end of the heat exchange pipe. The first branch water inlet pipe is arranged on one side of the heat exchange pipe, and one end of the first branch water inlet pipe is connected to the main water inlet pipe. A plurality of first water outlets are spaced apart on the first branch water inlet pipe, and each first water outlet is connected to each water inlet in a one-to-one correspondence. The second branch water inlet pipe is arranged on the other side of the heat exchange pipe, and one end of the second branch water inlet pipe is connected to the main water inlet pipe. A plurality of second water outlets are spaced apart on the second branch water inlet pipe, and each second water outlet is connected to each water inlet in a one-to-one correspondence.

2. The chilled beam air conditioning system terminal according to claim 1, characterized in that: The first branch water inlet pipe and the second branch water inlet pipe are both perpendicular to the straight sections of the heat exchange tube.

3. The chilled beam air conditioning system terminal according to claim 1, characterized in that: The other end of the first branch water inlet pipe and the other end of the second branch water inlet pipe are both sealed.

4. The chilled beam air conditioning system terminal according to claim 1, characterized in that: The heat exchanger further includes a water outlet pipe, one end of which is connected to the other end of the heat exchange pipe, and the other end of which is connected to the system water inlet pipe.

5. The chilled beam air conditioning system terminal according to claim 2, characterized in that: The heat exchanger further comprises a plurality of flow guides, each of which is arranged in the heat exchange tube and is located at the corresponding water inlet, so that the chilled water flow flows into the heat exchange tube.

6. The chilled beam air conditioning system terminal according to claim 5, characterized in that: The guide member includes two guide plates, which are respectively arranged obliquely on both sides of the water inlet. One end of the two guide plates is fixed to the heat exchange tube, and the other end of the two guide plates extends along the direction of the chilled water flow.

7. The chilled beam air conditioning system terminal according to claim 6, characterized in that: The included angle between each of the guide plates on one side of the heat exchange tube and the corresponding first branch water inlet pipe is 45°, and the included angle between each of the guide plates on the other side of the heat exchange tube and the corresponding second branch water inlet pipe is 45°.

8. The chilled beam air conditioning system terminal according to claim 1, characterized in that: The nozzle is a tapered structure.

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