CN107062708B - Elliptical tube evaporative cooling unit device - Google Patents

Abstract

The invention discloses an elliptical tube evaporative cooling unit device, comprising a water distribution system, a gas header, a plurality of elliptical tube heat exchange plates, a liquid header and a circulating water pan. The input ends of the elliptical tube heat exchange plates are connected to the gas The output end of the elliptical tube heat exchange plate is connected to the liquid header, the circulating water pan is provided with an elliptical tube heat exchange plate, and the water distribution system is located above the elliptical tube heat exchange plate, so The water distribution system is connected with the circulating water pan through a water pump. Compared with the prior art, the internal structure of the elliptical tube heat exchanger can be effectively improved to enhance its pressure bearing capacity. The circular tube heat exchanger has serious scaling problems under evaporative cooling conditions, and has the characteristics of high refrigeration efficiency and energy saving.

Description

An elliptical tube evaporative cooling unit device

technical field

The invention relates to an elliptical tube evaporative cooling unit device, which belongs to the field of heating ventilation and air conditioning.

Background technique

The evaporative cooling condenser is a kind of equipment that absorbs the heat of the high temperature gaseous refrigerant in the coil when the spray water outside the coil is partially evaporated, so that the refrigerant in the tube is gradually cooled from the gaseous state to the liquid state. Evaporative cooling is the most efficient cooling method, saving 10%-30% energy compared to traditional water-cooled and air-cooled systems. In the early stage of development, evaporative cooling units generally use coil-type heat exchangers. Due to its structure, it is easy to form dry spots and leeward surfaces, resulting in low heat exchange efficiency and serious scaling in long-term operation, which makes it unable to be popularized; In order to improve the coil heat exchanger, elliptical tubes are used instead of round tubes and added to the evaporative cooling unit. The elliptical tube heat exchanger has many advantages: 1. The external flow characteristics of the elliptical tube are better. When the fluid traverses along the long axis of the ellipse, the separation point of the elliptical tube moves backward, and the flow loss caused by the Karman vortex street is reduced. The air will not escape, and the resistance of the air is small during operation, which can appropriately reduce the energy consumption of the fan; 2. It can increase the effective contact surface area and enhance the heat exchange effect. For the same circumference, the flow cross-sectional area of the elliptical tube is smaller than that of the circular tube. , if the flow rate remains unchanged, the disturbance will be strengthened, and the convective heat transfer in the tube will be strengthened. For the case outside the tube, the average heat transfer effect outside the elliptical tube is better than that of the round tube. Since the ellipse is approximately streamlined, the flow velocity can be increased under the same flow resistance, so the external heat transfer can also be enhanced. 3. The structure of the heat exchanger is compact, which increases the heat exchange per unit volume; however, practice has proved that the heat exchanger on the condensing side needs to withstand a large pressure, and the production process of the elliptical tube generally adopts the round tube pressing technology, which can withstand a large amount of pressure. The pressure cannot meet the requirements, and it is easy to cause leakage, so that its application is currently only in the field of air conditioning, and it needs to be improved to make it better used in refrigeration units.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems in the prior art, and propose an elliptical tube evaporative cooling unit device, which can effectively improve the internal structure of the elliptical tube heat exchanger to enhance its pressure bearing capacity, and apply it to the evaporative condenser, It effectively solves the problem of serious scaling of the circular tube heat exchanger under evaporative cooling conditions, and has the characteristics of high refrigeration efficiency and energy saving.

In order to achieve the above purpose, the present invention proposes an elliptical tube evaporative cooling unit device, including a water distribution system, a gas header, a number of elliptical tube heat exchange plates, a liquid header and a circulating water pan. The input ends are connected to the gas headers, the output ends of the elliptical tube heat exchange plates are all connected to the liquid headers, the circulating water pan is provided with an elliptical tube heat exchange plate, and the water distribution system is located in the elliptical tube heat exchange. Above the plate, the water distribution system is connected to the circulating water pan through a water pump, and the elliptical tube heat exchange plate includes a heat-conducting oil input pipe, a heat-conducting oil output pipe, a number of elliptical pipes, a number of round pipes, an external thread and a number of supports. The elliptical tubes are arranged horizontally and are connected in sequence from top to bottom, and two adjacent elliptical tubes are communicated. Several circular tubes are installed in the elliptical tubes through several supports, and the outer ring surface of the circular tubes is provided with external threads. , the two ends of the elliptical pipe are respectively installed with a front connecting pipe and a rear connecting pipe, the elliptical pipe is not connected with the front connecting pipe and the rear connecting pipe, and the two ends of the circular pipe are respectively connected with the front connecting pipe and the rear connecting pipe. The output end of the front connection pipe is connected with the liquid header, the input end of the rear connection pipe is connected with the gas header, and the upper end of the uppermost elliptical pipe is provided with a heat transfer oil input pipe and a heat transfer oil output pipe.

Preferably, the upper end of the circulating water pan is fitted with a three-dimensional box with a cover water distribution system and an elliptical tube heat exchange plate installed, and the water distribution system and the elliptical tube heat exchange plate are fixedly installed in the three-dimensional box. The upper end of the box is provided with an air outlet, the air outlet is provided with a fan, and the left and right sides of the three-dimensional box are respectively provided with a left air inlet and a right air inlet close to the circulating water pan.

Preferably, a water baffle is provided above the water distribution system in the three-dimensional box.

Preferably, the upper part of the left side of the three-dimensional box is provided with a refrigerant vapor inlet connected to a gas header.

Preferably, the water distribution system is composed of a water distribution pipe and several nozzles arranged at the lower end of the water distribution pipe, and the input end and the output end of the water pump are respectively connected to the circulating water pan and the water distribution pipe through the water pumping pipe.

Preferably, the lower end of the elliptical tube heat exchange plate is immersed in the liquid in the circulating water pan, and the front side of the circulating water pan is provided with a refrigerant liquid outlet connected to a liquid header.

Preferably, a water replenishing pipe is provided on the rear side of the circulating water pan.

Beneficial effects of the present invention: the present invention effectively improves the internal structure of the elliptical tube heat exchanger to enhance its pressure bearing capacity, makes it exert the advantages of energy saving and high heat exchange efficiency during the condensation process of the refrigeration cycle, and applies it to the evaporative type In the condenser, the problem of serious scaling of the circular tube heat exchanger under evaporative cooling conditions is effectively solved, and at the same time, the circulating water is used to supercool the refrigerant liquid to further improve the refrigeration efficiency. In addition, when the evaporative condensation method of solution spraying is adopted, the solution regeneration can be realized by utilizing the operating characteristics of the unit.

The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structural representation of a kind of elliptical tube evaporative cooling unit device of the present invention;

Figure 2 is a schematic structural diagram of an elliptical tube heat exchange plate.

In the picture: 1-air outlet, 2-fan, 3-water baffle, 4-water distribution system, 5-refrigerant vapor inlet, 6-gas header, 7-oval tube heat exchange plate, 8-left air inlet , 9- Right air inlet, 10- Refrigerant liquid outlet, 11- Liquid header, 12- Circulating water pan, 13- Water pumping pipe, 14- Water pump, 15- Stereo box, 16- Water supply pipe, 17- Heat conduction oil Input pipe, 18-conducting oil output pipe, 19-oval pipe, 20-round pipe, 21-external thread, 22-support, 23-front connecting pipe, 24-rear connecting pipe, 41-water distribution pipe, 42-spray head.

Detailed ways

Referring to Figures 1 and 2, an elliptical tube evaporative cooling unit device of the present invention includes a water distribution system 4, a gas header 6, several elliptical tube heat exchange plates 7, a liquid header 11 and a circulating water pan 12. The elliptical tube The input ends of the heat exchange plates 7 are all connected to the gas headers 6, the output ends of the elliptical tube heat exchange plates 7 are all connected to the liquid headers 11, and the circulating water pan 12 is provided with an elliptical tube heat exchange plate 7, The water distribution system 4 is located above the elliptical tube heat exchange plate 7. The water distribution system 4 is connected to the circulating water pan 12 through the water pump 14. The upper end of the circulating water pan 12 is fitted with a cover water distribution system 4 and The three-dimensional box body 15 of the elliptical tube heat exchange plate 7, the water distribution system 4 and the elliptical tube heat exchange plate 7 are fixedly installed in the three-dimensional box body 15, the upper end of the three-dimensional box body 15 is provided with an air outlet 1, the said The air outlet 1 is provided with a fan 2, the left and right sides of the three-dimensional box 15 are respectively provided with a left air inlet 8 and a right air inlet 9 close to the circulating water pan 12, and the three-dimensional box 15 is clothed inside. The upper part of the water system 4 is provided with a water baffle 3, the upper part of the left side of the three-dimensional box 15 is provided with a refrigerant vapor inlet 5 connected to the gas header 6, and the water distribution system 4 consists of a water distribution pipe 41 and a device. A plurality of nozzles 42 are formed at the lower end of the water distribution pipe 41. The input end and the output end of the water pump 14 are respectively connected to the circulating water pan 12 and the water distribution pipe 41 through the water pumping pipe 13. The lower end of the elliptical tube heat exchange plate 7 is immersed in the circulating water. In the liquid in the pan 12, the front side of the circulating water pan 12 is provided with a refrigerant liquid outlet 10 connected to the liquid header 11, and the elliptical tube heat exchange plate 7 includes a heat transfer oil input pipe 17 and a heat transfer oil output pipe. 18. Several elliptical tubes 19, several round tubes 20, external threads 21 and several supports 22, the elliptical tubes 19 are arranged horizontally and are connected in sequence from top to bottom, and the two adjacent elliptical tubes 19 communicate with each other. Inside the elliptical tube 19, a plurality of circular tubes 20 are installed through a plurality of supports 22. The outer surface of the circular tube 20 is provided with an external thread 21, and the two ends of the elliptical tube 19 are respectively installed with a front connecting tube 23 and a rear connecting tube. Pipe 24, the elliptical pipe 19 is not communicated with the front connecting pipe 23 and the rear connecting pipe 24, the two ends of the circular pipe 20 are respectively connected with the front connecting pipe 23 and the rear connecting pipe 24, the output of the front connecting pipe 23 The end is connected with the liquid header 11, the input end of the rear connecting pipe 24 is connected with the gas header 6, the upper end of the uppermost elliptical pipe 19 is provided with a heat transfer oil input pipe 17 and a heat transfer oil output pipe 18, the circulation The rear side of the water pan 12 is provided with a water replenishing pipe 16 .

The heat transfer oil is injected from the heat transfer oil input pipe 17, and can be discharged from the heat transfer oil output pipe 18 if the oil is to be drained. The heat transfer oil is filled between the inside of the elliptical pipe 19 and the outside of the round pipe 20. For the heat exchange effect between the refrigerant and the heat transfer oil, the support 22 supports the circular tube 20 and enhances the pressure bearing capacity of the elliptical tube to a certain extent.

The working process of the present invention:

In the working process of an elliptical tube evaporative cooling unit device of the present invention:

Refrigeration conditions: The water distribution system 4 sprays cooling water for condensation.

The cooling water is sent to the water distribution system 4 by the water pump 14 and sprayed onto the elliptical tube heat exchange plate 7, and flows in a staggered and overlapping manner along the outside of the elliptical tube 19. Flushing treatment can effectively reduce scaling and have a strong heat exchange effect. The unevaporated cooling water flows into the circulating water pan 12 . The refrigerant vapor enters the gas header 6 through the refrigerant vapor inlet 5 , is distributed to each elliptical tube heat exchange plate 7 , and evenly enters the circular tubes 20 in each elliptical tube 19 . Relying on the heat absorption and evaporation of the cooling water and the heat transfer of the heat transfer oil, the refrigerant vapor in the circular tube 20 is cooled and condensed. At the same time, the fan 2 makes the air enter from the left air inlet 8 and the right air inlet 9, blows from the bottom to the top on the outer surface of the water film outside the elliptical tube 19, and blows out from the air outlet 1 to evaporate the water film surface. The water vapor is taken away in time to create favorable conditions for the continuous evaporation of the water film. In order to reduce the entrainment of the circulating water of the evaporative cooler, a water baffle 3 is set on the upper part of the three-dimensional box 15, and a water supply pipe 16 is set to replenish fresh water. In addition, the lower end portion of the elliptical tube heat exchange plate 7 is immersed in the circulating liquid of the circulating water pan 12 to further supercool the refrigerant liquid, which can effectively improve the cooling efficiency.

Heating conditions: in winter, the cooling water is replaced with a cooling solution, and the water distribution system 4 sprays the cooling solution for condensation.

When using the cooling solution for evaporative cooling, although the cooling solution will absorb a part of the moisture in the air and dilute, but at the same time a part of the moisture in the cooling solution will absorb heat and evaporate during the refrigerant condensation process. After being blown out, the concentration of the cooling solution increases, and the regeneration of the cooling solution can be realized.

The invention effectively improves the internal structure of the elliptical tube heat exchanger to enhance its pressure bearing capacity, makes it exert the advantages of energy saving and high heat exchange efficiency during the condensation process of the refrigeration cycle, and is applied to the evaporative condenser, effectively The problem of serious scaling of the circular tube heat exchanger under evaporative cooling conditions is solved, and the refrigerant liquid is supercooled by using circulating water to further improve the refrigeration efficiency. In addition, when the evaporative condensation method of solution spraying is adopted, the solution regeneration can be realized by utilizing the operating characteristics of the unit.

The above-mentioned embodiments are illustrative of the present invention, not limitations of the present invention, and any scheme after simple transformation of the present invention belongs to the protection scope of the present invention.

Claims (7)

1. An elliptical tube evaporative cooling unit device, characterized in that it comprises a water distribution system (4), a gas header (6), several elliptical tube heat exchange plates (7), a liquid header (11) and a circulating water pan (12), the input ends of the elliptical tube heat exchange plates (7) are all connected to the gas headers (6), and the output ends of the elliptical tube heat exchange plates (7) are all connected to the liquid headers (11), The circulating water pan (12) is provided with an elliptical tube heat exchange plate (7), the water distribution system (4) is located above the elliptical tube heat exchange plate (7), and the water distribution system (4) passes through a water pump (14) Connected to the circulating water pan (12), the elliptical tube heat exchange plate (7) includes a heat transfer oil input pipe (17), a heat transfer oil output pipe (18), a number of elliptical pipes (19), a number of round pipes ( 20), external threads (21) and several supports (22), the elliptical tubes (19) are arranged laterally and are connected in sequence from top to bottom, and are communicated between two adjacent elliptical tubes (19). 19) A number of circular tubes (20) are installed inside through a number of supports (22). The outer surface of the circular tube (20) is provided with external threads (21), and the two ends of the elliptical tube (19) are respectively A front connecting pipe (23) and a rear connecting pipe (24) are installed, the elliptical pipe (19) is not communicated with the front connecting pipe (23) and the rear connecting pipe (24), and both ends of the round pipe (20) They are respectively connected with the front connecting pipe (23) and the rear connecting pipe (24), the output end of the front connecting pipe (23) is connected with the liquid header (11), and the input end of the rear connecting pipe (24) is connected with the gas The headers (6) are connected, and the upper end of the uppermost elliptical tube (19) is provided with a heat transfer oil input pipe (17) and a heat transfer oil output pipe (18). 2. An elliptical tube evaporative cooling unit device according to claim 1, characterized in that: the upper end of the circulating water pan (12) is fitted with a cover water distribution system (4) and an elliptical tube heat exchange plate ( 7) The three-dimensional box (15), the water distribution system (4) and the elliptical tube heat exchange plate (7) are fixedly installed in the three-dimensional box (15), and the upper end of the three-dimensional box (15) is provided with a The air outlet (1) is provided with a fan (2) in the air outlet (1), and the left side and the right side of the three-dimensional box (15) are respectively provided with left air close to the circulating water pan (12). Inlet (8) and Right Air Inlet (9). 3 . The elliptical tube evaporative cooling unit device according to claim 2 , wherein a water baffle ( 3 ) is arranged above the water distribution system ( 4 ) in the three-dimensional box ( 15 ). 4 . The elliptical tube evaporative cooling unit device according to claim 2, characterized in that: the upper part of the left side of the three-dimensional box (15) is provided with a refrigerant vapor connected to the gas header (6). Entrance (5). 5. An elliptical tube evaporative cooling unit device according to claim 1, characterized in that: the water distribution system (4) consists of a water distribution pipe (41) and a plurality of nozzles (42) arranged at the lower end of the water distribution pipe (41). It is constituted that the input end and the output end of the water pump (14) are respectively connected to the circulating water pan (12) and the water distribution pipe (41) through the water pumping pipe (13). 6. An elliptical tube evaporative cooling unit device according to claim 1, characterized in that: the lower end of the elliptical tube heat exchange plate (7) is immersed in the liquid in the circulating water pan (12), and the circulating The front side of the water pan (12) is provided with a refrigerant liquid outlet (10) connected to the liquid header (11). 7. An elliptical tube evaporative cooling unit device according to any one of claims 1 to 6, characterized in that: a water replenishing pipe (16) is provided on the rear side of the circulating water pan (12).

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