CN202119022U - High temperature surface cooling, tube type indirect and direct three-level combination evaporation cooling air handling set - Google Patents

Abstract

The utility model relates to a high temperature surface cooling, tube type indirect and direct three-level combination evaporation cooling fresh air handling set, which comprises a filter, a high temperature surface cooler, a tube type indirect evaporation cooler, a direct evaporation cooler and an air feeding machine, wherein the filter, the high temperature surface cooler, the tube type indirect evaporation cooler, the direct evaporation cooler and the air feeding machine are sequentially arranged in a set casing in the air inlet direction. A secondary fan is arranged on the upper portion of the tube type indirect evaporation cooler. Fresh air of a user system is generated by means of a combination method of indirect evaporation cooling technology and direct evaporation cooling technology. First level precooling on outdoor fresh air is performed through the high temperature surface cooler, efficiency of generating of the fresh air of a direct evaporation cooling section is improved, the set is compact in structure and reasonable in arrangement, covered space is reduced, efficiency of generating of the fresh air is remarkable, and energy is saved simultaneously.

Description

High temperature surface cooling, tubular indirect, direct three-stage combined evaporative cooling fresh air unit

technical field

The utility model belongs to the technical field of air-conditioning equipment, in particular to a high-temperature surface cooling, pipe-type indirect and direct three-stage combined evaporative cooling fresh air unit. the

Background technique

With the promulgation and implementation of a series of relevant national standards, norms and measures to encourage the use of evaporative cooling technology, evaporative cooling air conditioners play an important role in the process of energy saving and pollution reduction: for the outdoor environment, CFCS is not used, and the atmosphere No pollution; for the indoor environment, it can not only make full use of the natural cold source to reduce power consumption, but also provide 100% fresh air for the room. In addition, it has the function of air filter and humidification to purify and humidify the air. An environmentally friendly, efficient and economical cooling method. The direct evaporative cooler sprays circulating water on the top of the filler, so that the outdoor fresh air flowing through the heat exchanger directly contacts the water film on the surface of the filler for heat and moisture exchange, thereby reducing the temperature of the outdoor fresh air. The tubular indirect evaporative cooler is sprayed with circulating water, and a layer of water film is formed on the surface of the tubular heat exchange tube. The evaporation of the water film is completed by absorbing heat, so that the temperature of the water film is close to the wet bulb temperature of the secondary air, and the outdoor fresh air passes through The heat exchange tube and the water film transfer heat to the secondary air, thereby reducing the temperature of the fresh air. The high-temperature surface cooler is to pass high-grade cold water into the high-temperature surface cooler to pre-cool the outdoor fresh air, and to recycle the cooling capacity during the wet cooling process. At the same time, evaporative cooling air conditioners can not only provide a comfortable temperature, but also reduce the equipment and operating costs of traditional mechanical refrigeration and reduce the water consumption in the cooling tower system. In winter, it can achieve low-cost humidification, reduce the use of fossil fuels, and help environmental protection. . the

Contents of the invention

The purpose of this utility model is to provide a high-temperature surface cooling, tube-type indirect, direct three-stage combined evaporative cooling fresh air unit, which combines a high-temperature surface cooler, a tube-type indirect evaporative cooler and a direct evaporative cooler to form a three-stage evaporative cooler. Cool the air conditioning unit to produce fresh air, so that the efficiency of heat and mass transfer of the unit is improved. the

The technical scheme adopted by the utility model is that the high-temperature surface cooling, pipe-type indirect and direct three-stage combined evaporative cooling fresh air unit includes a filter, a high-temperature surface cooler, a pipe-type An indirect evaporative cooler, a direct evaporative cooler and a blower, and a secondary fan is arranged on the upper part of the tube-type indirect evaporative cooler. the

The utility model is also characterized in that

The structure of the direct evaporative cooler includes: packing and the water supply pipe b set on the upper part of the packing and the direct water tank set on the lower part of the packing. The water supply pipe b is fixed with a plurality of nozzles b spraying the packing. The direct water tank passes through the pipeline and the direct circulating water pump, The water supply pipe b communicates with the nozzle b. the

The structure of the tube-type indirect evaporative cooler includes: a heat exchange tube family composed of multiple heat exchange tubes placed in parallel. The nozzle a of family spraying, the lower part of the heat exchange tube family is provided with an indirect water tank, and the indirect water tank is connected with the indirect circulating water pump, water supply pipe a and nozzle a through pipelines. the

A layer of water-retaining filler is arranged between the water supply pipe a of the tube-type indirect evaporative cooler and the secondary fan. the

The inner surface of the heat exchange tube is provided with a plastic helical coil. the

The beneficial effects of the three-stage combined evaporative cooling fresh air unit of the present utility model are:

1. Fresh air is produced through a three-stage evaporative cooling air conditioning unit that combines high-temperature surface coolers, tubular indirect evaporative coolers and direct evaporative coolers. the

2. The combination of cross-flow cooling and counter-flow cooling improves cooling efficiency and saves floor space. the

3. Connect high-grade user return water to the high-temperature surface cooler to pre-cool the outdoor fresh air and recycle the cooling capacity. Part of the treated fresh air continues to be used as primary air, and part of it is used as the tube-type indirect evaporative cooler. The secondary air conducts heat and mass transfer to the primary air. the

4. The plastic spiral coil is inserted into the heat exchange tube to enhance heat and mass transfer. the

Description of drawings

Fig. 1 is the structural representation of the three-stage combined evaporative cooling fresh air unit of the utility model;

Fig. 2 is a schematic diagram of the internal structure of the heat exchange tube in the unit of the utility model. the

In the figure, 1. filter, 2. high temperature surface cooler, 3. indirect circulating water pump, 4. indirect water tank, 5. direct circulating water pump, 6. direct water tank, 7. air blower, 8. tubular indirect evaporative cooler, 9. Secondary fan, 10. Water supply pipe a, 11. Direct evaporative cooler, 13. Nozzle a, 14. Heat exchange pipe, 15. Plastic spiral coil, 16. Packing, 17. Water supply pipe b, 18. Nozzle b . the

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. the

The utility model of high-temperature surface cooling, tubular indirect, direct three-stage combined evaporative cooling fresh air unit has a structure as shown in Figure 1, including a filter 1 and a high-temperature surface cooler 2 arranged sequentially in the unit casing according to the direction of air intake , a tube-type indirect evaporative cooler 8, a direct evaporative cooler 11 and a blower 7, and the upper part of the tube-type indirect evaporative cooler 8 is provided with a secondary fan 9. the

The structure of the direct evaporative cooler 11 includes: the filler 16 and the water supply pipe b17 arranged on the upper part of the filler 16 and the direct water tank 6 arranged on the lower part of the filler 16. The water supply pipe b17 is fixed with a plurality of nozzles b18 spraying the filler 16, and the direct water tank 6 It communicates with the direct circulating water pump 5, the water supply pipe b17 and the nozzle b18 through pipelines. the

The structure of the tubular indirect evaporative cooler 8 includes: a heat exchange tube family composed of a plurality of heat exchange tubes 14 placed in parallel, the upper part of the heat exchange tube family is provided with a water supply pipe a10, and a plurality of direction exchange pipes are fixed on the water supply pipe a10 The spray nozzle a13 of the heat pipe family, the lower part of the heat exchange pipe family is provided with an indirect water tank 4, and the indirect water tank 4 communicates with the indirect circulating water pump 3, the water supply pipe a10 and the nozzle a13 through pipelines. A layer of water-retaining filler is arranged between the water supply pipe a10 of the tubular indirect evaporative cooler 8 and the secondary fan 9 . the

The heat exchange tube 14 of the present utility model adopts an elliptical cross-section, and a plastic spiral coil 15 is arranged on the inner surface, and its structure is shown in FIG. 2 . the

The working principle of the three-stage combined evaporative cooling fresh air unit of the utility model is as follows:

In the primary high-temperature surface cooler 2, the high-grade cold water returned from the room is passed through to pre-cool the outdoor fresh air once, and the fresh air after pre-cooling is divided into two parts: one part uses the second-stage tube-type indirect evaporative cooler 8 The fresh air is further subjected to iso-humid cooling and temperature reduction treatment, and then the fresh air after two-stage cooling undergoes isenthalpic treatment in the direct evaporative cooler 11, the temperature of the fresh air is further reduced, and finally sent into the room by the blower 7. The temperature of the treated fresh air can be reduced below the wet bulb temperature of the outdoor fresh air, even close to the dew point temperature of the outdoor fresh air, thereby reducing the total fresh air volume needed indoors; the other part is used as the secondary air of the tubular indirect evaporative cooler 8 , to cool the fresh air in the tube-type indirect evaporative cooler 8, compared with the secondary air after the pre-cooling treatment, it is directly introduced into the outdoor fresh air, and its temperature is lower, and heat transfer occurs with the fresh air in the tube-type indirect evaporative cooler In the process of mass transfer, its efficiency is higher. the

The characteristics of the three-stage combined evaporative cooling fresh air unit of the utility model are:

Fresh air is produced through a three-stage evaporative cooling air conditioning unit that combines high-temperature surface coolers, tubular indirect evaporative coolers and direct evaporative coolers. The outdoor fresh air is pre-cooled through the high-temperature surface cooler. The pre-cooled fresh air undergoes iso-humidity cooling in the tubular indirect evaporative cooler, and the fresh air after two-stage indirect cooling undergoes isenthalpic treatment in the direct evaporative cooler. The temperature of the fresh air is further reduced, and finally sent into the room by the blower. the

The combination of cross-flow cooling and counter-flow cooling improves cooling efficiency and saves floor space. The outdoor fresh air undergoes cross-flow cooling in the high-temperature surface cooler, and part of the cooled fresh air is used as primary air to use the tube-type indirect evaporative cooler for further equal-wet cooling and cooling of the fresh air. The fresh air after two-stage cooling is generated in the direct evaporative cooler. Isenthalpic treatment, the temperature of the fresh air is further reduced, and finally sent into the room by the blower. The other part is used as the secondary air of the tube-type indirect evaporative cooler. Counterflow cooling occurs to cool the fresh air in the tube-type indirect evaporative cooler. The efficiency of heat and mass transfer between the precooled secondary air and the fresh air in the tube-type indirect evaporative cooler is higher. the

The high-grade user return water is connected to the high-temperature surface cooler to pre-cool the outdoor fresh air, and the cooling capacity is recycled. Part of the treated fresh air continues to be used as primary air, and part of it is used as secondary air for the tubular indirect evaporative cooler. The wind conducts heat and mass transfer to the primary air. Because the temperature of the user's return water is very low compared with the temperature of the outdoor fresh air, sending it back to the chiller will cause a waste of cooling capacity. If the high-temperature return water is first passed into the high-temperature surface cooler to perform primary pre-cooling of the outdoor fresh air, a process of isohumidity cooling occurs, which reduces the temperature of the fresh air, and then passes through the second-stage tube-type indirect evaporative cooler and direct evaporative cooler. After treatment, the fresh air temperature is lower than the wet bulb temperature, even close to the dew point temperature of the outdoor fresh air. the

A plastic spiral coil is inserted into the heat exchange tube to enhance heat and mass transfer. By inserting a helical wire into the heat exchange tube, the flow path of fresh air inside and outside the tube is increased and a swirling flow is formed. Due to the action of centrifugal force, hot air flows from the center of the tube to the tube wall, while cold air flows from the tube wall to the center of the tube. The secondary flow achieves the purpose of radial mixing. And because the diameter of the helix increases the roughness of the tube wall, when the swirling flow flows through, the turbulent flow of the fresh air is increased, the bottom layer of the laminar flow is thinned, the thermal resistance is reduced, and the purpose of enhancing heat transfer is achieved, so that The fresh air outlet temperature drops even lower. the

Claims (5)

1. High-temperature surface cooling, pipe-type indirect, direct three-stage combined evaporative cooling fresh air unit, which is characterized in that it includes a filter (1), a high-temperature surface cooler (2), and A tube-type indirect evaporative cooler (8), a direct evaporative cooler (11) and a blower (7), the upper part of the tube-type indirect evaporative cooler (8) is provided with a secondary fan (9). 2. The three-stage combined evaporative cooling fresh air unit according to claim 1, characterized in that, the structure of the direct evaporative cooler (11) includes: filler (16) and water supply pipe b set on the upper part of the filler (16) (17) and the direct water tank (6) that filler (16) bottom is provided with, on the water supply pipe b (17), be fixed with a plurality of nozzle b (18) that sprays to filler (16), direct water tank (6) passes pipeline and The direct circulation water pump (5), the water supply pipe b (17) and the nozzle b (18) are connected. 3. The three-stage combined evaporative cooling fresh air unit according to claim 1, characterized in that the structure of the tubular indirect evaporative cooler (8) comprises: composed of multiple heat exchange tubes (14) placed in parallel The heat exchange tube family is equipped with a water supply pipe a (10) on the upper part of the heat exchange tube family, and a number of nozzles a (13) are fixed on the water supply pipe a (10) to spray the heat exchange tube family. The lower part is provided with an indirect water tank (4), and the indirect water tank (4) communicates with the indirect circulating water pump (3), the water supply pipe a (10) and the nozzle a (13) through pipelines. 4. The three-stage combined evaporative cooling fresh air unit according to claim 3, characterized in that, the water supply pipe a (10) of the tubular indirect evaporative cooler (8) is arranged between the secondary fan (9) There is a layer of water-retaining filler. 5. The three-stage combined evaporative cooling fresh air unit according to claim 3 or 4, characterized in that the cross-section of the heat exchange tube (14) is oval, and the inner surface is provided with a plastic spiral coil (15).

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