KR100358494B1 - A air cooling system and air cooling method using latent heat of evaporation - Google Patents

Abstract

PURPOSE: An air cooling system and an air cooling method are provided to maximize efficiency of the air cooling system by spraying fine water droplets to the air when the outdoor air temperature is high. CONSTITUTION: An air cooling system comprises an air cooled heat exchanger(1); a fine water droplet generating unit for generating fine water droplets floating in the air; and a fine water droplet transport unit for transporting the fine water droplets generated by the fine water droplet generating unit, together with air to the air cooled heat exchanger. The fine water droplet generating unit includes a spray nozzle(23), a pump(22) and a pipe(21). The fine water droplet transport unit includes an air blower(24), a mesh screen(26) and a motor(25). The fine water droplets are evaporated in the air during transportation and absorb the latent heat of evaporation, to thereby cool the air. The air cooled heat exchanger is cooled by the cooled air.

Description

Air cooling system and air cooling method using evaporation heat {A AIR COOLING SYSTEM AND AIR COOLING METHOD USING LATENT HEAT OF EVAPORATION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cooling system and a method thereof, and more particularly, to an air cooling system and a method for cooling an air temperature by using vaporization heat of droplets distributed in air.

Common air cooling methods include water cooling and air cooling. One of these air-cooled cooling method looks through the accompanying drawings in FIG.

1 is a block diagram of a conventional air-cooled heat exchanger.

As shown in FIG. 1, the cooled fluid passes through a header box 4 through an inlet pipe 2 and then flows through a plurality of fin tubes 6 to be cooled or condensed. Discharge through the outlet pipe 3 via (5).

At this time, the cooling air flows into the air inlet 8 from the outside by the blower 9 moving by the power of the motor 10 and then flows through the surface of the fin tube 6 through the air inlet 7 and is cooled. Perform heat exchange with the fluid.

That is, the low-temperature air introduced through the air inlet 8 absorbs the heat of the cooled fluid flowing through the inside of the fin tube 6 to cool the cooled fluid, and thus is heated by heat exchange with the cooled fluid. Air is discharged through the top of the heat exchanger.

Such an air-cooled heat exchanger is a cooling device that can be commonly seen in our daily lives or in petrochemical plants. In summer, when air temperature is high, cooling capacity of the cooled fluid to the target temperature reveals many problems in its capacity.

In particular, numerous petrochemical plants are equipped with air-cooled heat exchangers.

This air-cooled heat exchanger often needs to operate outside its optimum design range as the ambient temperature rises. For example, most air-cooled heat exchangers installed in refineries in Korea are designed with atmospheric temperatures between 30 ° C and 32 ° C. If the air temperature is lower than the value, there is room for operation, but if the air temperature rises above the design temperature, a capacity shortage phenomenon occurs.

Most design air temperatures are designed to be lower than the local maximum expected temperature. This is because, as the temperature increases, the size of the air-cooled heat exchanger increases, which increases the initial installation cost and the operating cost.

Therefore, conventionally, when the air temperature is higher than the designed air temperature, water is sprayed from the top of the heat exchanger to avoid the capacity shortage. However, this requires an enormous amount of water and many difficulties arise from water spraying.

Accordingly, the present invention is to develop an air cooling system capable of bringing a cooled fluid to a target temperature without increasing the capacity of the heat exchanger even in summer when the atmospheric temperature is high.

In addition, an object of the present invention is to provide a new cooling method capable of lowering the temperature of the outside air flowing into the object to be cooled using vaporization heat.

In addition, an object of the present invention is to optimize the efficiency of the air-cooled cooling method by spraying water droplets to the air in the air flowing into the object to be cooled to cool the temperature of the air while the water droplets vaporize.

Air cooling system of the present invention based on the above technical idea and object is to be cooled; Fine water droplet generating means for generating a fine droplet of a size long enough to float in the air according to the movement speed of the air; A fine droplet transport means for transporting a plurality of fine droplets generated by the fine droplet generation means to the object to be cooled together with air in the air; The droplets during transportation are evaporated in the air to absorb the heat of vaporization, the air deprived of the heat of vaporization is cooled, the object to be cooled is cooled by this cooling air.

The droplet generation means includes an injection nozzle which aerosolizes water to enlarge the surface of the water in contact with the air.

At this time, the fine droplets during the transportation is preferably 100% vaporized.

The droplets transport means includes a blower for transporting the droplets and evenly distributed in the air.

In addition, the present invention and the temperature measuring means for measuring the atmospheric temperature; By comparing the measured air temperature with the set target temperature, if the air temperature exceeds the target temperature, the micro water droplet generating means and the micro water droplet transporting means are driven; on the contrary, if the air temperature is lower than the target temperature, the micro water droplet generating means and the micro water droplets. And cooling control means for stopping the conveying means.

Here, the object to be cooled may be an air-cooled heat exchanger, a spectator seat inside a livestock kennel, or the like.

In addition, the air cooling method of the present invention comprises the first step of generating a fine droplet of the size enough to float in the air in accordance with the moving speed of the air to the air; A second step of transporting the droplets injected in the first step together with the air in the atmosphere to the object to be cooled; A third step of generating cooling air by evaporating the droplets in the air by absorbing vaporization heat in the air; And a fourth step of cooling the object to be cooled by using the cooling air generated in the third step.

The air cooling method of the present invention is a pre-treatment step prior to the first step, and the first step is performed only when the atmospheric temperature exceeds the target temperature by comparing the measured temperature with the measured target temperature and the set target temperature. And additionally, a cooling control process for performing the fourth step.

Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the appended claims.

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate the presently preferred embodiments of the invention and, together with the description of the following preferred embodiments, serve to explain the principles of the invention.

Figure 1 shows a schematic diagram of a conventional air-cooled heat exchanger.

Figure 2 shows the configuration of one embodiment of an air cooling system according to the present invention.

Figure 3 shows the configuration of another embodiment of an air cooling system according to the present invention.

<Description of the symbols for the main parts of the drawings>

23: injection nozzle 21: pipe

22: pump 24: blower

25: motor 26: net screen

27: thermocouple 26: controller

The present invention focuses on the fact that when water 1ι evaporates in air, 582 kcal of vaporization heat is absorbed in the air. In addition, to rapidly evaporate water, the surface of the water in contact with air must be large. In other words, in order to increase the contact surface with air, water must be aerosolized (small droplets of fine size and floating in the air).

For example, if the size of the water droplets is 30 μm, the area where 1 μ of water contacts air is 100 m 2. At this time, the water evaporates for about 2 minutes, and because the drop rate is 0.027m / s due to gravity, these droplets keep floating in the air even with a small breeze. This principle allows the air to be cooled outdoors.

Hereinafter, with reference to the accompanying drawings will be described the configuration of a specific embodiment of the present invention for realizing the above-described principle.

2 shows a case where the present invention is applied to an air-cooled heat exchanger, and FIG. 3 shows a case where the present invention is applied to a livestock barn.

Example 1

As shown in Figure 2, the air cooling apparatus developed by the present inventors is installed around the air inlet of the conventional air-cooled heat exchanger.

Since the configuration of the air-cooled heat exchanger is the same as the conventional one, the description of the configuration and operation is omitted.

Near the air inlet 8 of the air-cooled heat exchanger 1, the air cooling apparatus 20 of the present invention including the injection nozzle 4 is located, respectively.

The air cooling apparatus 20 of the present invention includes: fine droplet generation means including a spray nozzle 23, a pump 22, and a pipe 21; And a cooling control unit including a blower 24, a net screen 26, a fine droplet carrier including a motor 25, a thermocouple 27, and a controller 28.

The fine droplet generating means is for generating and injecting fine droplets into the air flowing into the heat exchanger (1), the pump 21 and the pump for pressurizing the water introduced through the pipe 21 And a spray nozzle 23 which makes the water pressurized by the pump 22 fine and sprays it into the air.

Since the injection nozzle 23 must aerosolize the water pressurized by the pump into droplets of about 1-1000 μm, it is preferable to use an air assist nozzle instead of a simple pneumatic nozzle. Do.

In addition, the injection nozzle 23 should be located opposite the air inlet 8 of the air-cooled heat exchanger 1 so that fine droplets can be uniformly distributed in the air flowing into the air inlet 8.

That is, the injection nozzle 23 is disposed between the air inlet 1 of the heat exchanger and the blower 24 to be described later, the fine droplets are uniformly distributed in the air by the wind transmitted from the blower 24. But it doesn't fall off and can stay in the air long. As such, the fine droplets float in the air for a long time to vaporize the fine droplets as much as possible and the air flowing into the heat exchanger is cooled to the maximum.

In addition, the injection nozzle 23 may be installed on the side of the air passage so as to spray the droplets at any position between the air inlet 8 and the blower 24 of the heat exchanger. In this case, however, it is difficult to uniformly distribute the fine droplets.

In addition, the injection nozzle 23 is designed to adjust the size of the water droplets according to the moving speed of the air. At this time, the size of the water droplets is such that the size of a long floating in the air. Table 1 below shows the relationship between water droplet size and air velocity.

Water droplet size (㎛) 30 40 60 70 80 90 100 Air speed (m / s) 0.027 0.048 0.11 0.47 0.19 0.24 0.30

In FIG. 2, only one injection nozzle 23 is installed, but a plurality of injection nozzles 23 may be provided.

The droplet transport means is transported to the air inlet of the heat exchanger without dropping the droplets injected into the air, and to distribute the droplets evenly in the air to quickly evaporate.

The droplet transport means is installed on the rear surface of the injection nozzle 23 to generate a wind blower 24 for moving the air containing the micro droplets, and a motor for generating a rotational force for rotating the blower (24) 25 and a net screen 26 installed to protect the blower 24.

The net screen 26 is made of a net as shown by the dotted line in the figure is free to inlet and outlet of air.

The motor is controlled on / off by a controller described later.

The cooling control unit compares the thermocouple 27 for measuring the atmospheric temperature and the atmospheric temperature measured by the thermocouple 27 with the set target temperature, and if the measured temperature is higher than the set temperature, the pump 22 and the motor. The controller 28 is configured to drive 25 and stop the driving of the pump 22 and the motor 25 when the measured temperature is lower than the set temperature.

Since the set temperature may vary depending on the specification of the air-cooled heat exchanger, it may not be uniformly described, but may be viewed as about 30 ° C.

Therefore, when the air temperature is very high (above 30 ℃), the measurement temperature is higher than the set target temperature in the midday to early evening in summer, so that the air cooling system is operated by driving the motor and pump, otherwise Stopping the chiller can prevent unnecessary waste of energy.

Looking at the specific operation of the air cooling system according to the first embodiment of the present invention having the configuration as described above are as follows.

The controller 28 compares the atmospheric temperature input from the thermocouple 27 with a preset set temperature, and if the temperature of the outside air is high enough that the atmospheric temperature exceeds the set temperature as a result of the comparison, the motor 25 and the pump 22 ).

As the motor 25 and the pump 22 are operated, the spray nozzle 23 and the blower 24 are operated. The droplets ejected from the spray nozzle 23 are blown by the wind transmitted from the blower 24. It is uniformly distributed in the air and is then inputted to the air inlet 8 of the heat exchanger 1 at a constant speed without falling.

Fine droplets injected into the air and moving toward the air inlet 8 are evaporated during the movement to absorb the heat of vaporization from the surrounding air. Accordingly, the air introduced into the air inlet 8 becomes the cooling air deprived of the heat of vaporization.

Since the cooling air is introduced through the air inlet 8 of the heat exchanger, the heat exchanger performs heat exchange with the cooled fluid, thereby improving the performance of the heat exchanger even in the summer when the temperature of the outside air is very high.

Example 2

This embodiment is also the same in basic technical thought as the first embodiment. However, the present embodiment differs from the first embodiment in the object to be cooled to which the air cooling apparatus including the injection nozzle is applied.

That is, in the present embodiment, unlike the first embodiment, the object to be cooled is a closed space such as a livestock barn or a grandstand of an athletic stadium.

Hereinafter, the present embodiment will be described in detail by taking the livestock barn 30 shown in FIG. 3 as an example.

As shown in FIG. 3, one side of the livestock house 30 is provided with an air inlet 31 for introducing external air, and the air inlet 31 has the same injection nozzle 32 and blower as in the first embodiment. 36), the air cooling apparatus provided with the motor 35 etc. is provided. This air cooling device is preferably installed in the stall wall at a relatively high position.

However, the injection nozzle 32 of the present embodiment is characterized in that the air auxiliary nozzle having a pipe 33 and an air compressor 34 for introducing water.

In addition, in this embodiment, since precise control is not necessary like a heat exchanger, the cooling control part provided with a thermocouple and a controller does not need to be provided separately. That is, when the air temperature is too high, the user can reduce the temperature inside the house according to the same principle as the first embodiment by operating the motor and the injection nozzle.

Of course, in the present embodiment, it is possible to include the same cooling control unit as in the first embodiment, but in this case, the installation cost is high compared to the efficiency.

In the following, the operation of the present embodiment is outlined.

Livestock are at risk of dying if the air temperature rises above 38 ° C in summer. At this time, when the air cooling apparatus of the present embodiment is operated, the water supplied through the pipe 33 is pressurized by the air compressor 34 is injected into the droplets through the injection nozzle 32. These fine water droplets are transported into the barn 30 together with the air introduced from the outside by the blower 36. At this time, the droplets evaporate while falling in the air.

The speed at which fine droplets fall in the pen is shown in Table 2 below.

Water droplet size (㎛) 30 40 50 60 70 80 90 Drop speed (cm / s) 2.69 4.78 7.47 10.08 14.66 19.15 24.23

Therefore, the size of the fine droplets are selected so that all of the droplets can be evaporated.

The present invention is not limited to the above-described embodiments, and various modifications and variations are made by those skilled in the art within the equivalent scope of the technical concept of the present invention and the claims to be described below. Of course it is possible.

The air cooling system of the present invention can maximize the efficiency of the air-cooled cooling system by lowering the temperature of the air by spraying fine droplets in the air when the outside air temperature is high, such as summer.

In addition, the present invention achieves clean and efficient cooling with low energy by increasing the surface area of water by miniaturizing the size of water droplets sprayed into the air.

Claims (10)

Air-cooled heat exchangers; Fine water droplet generating means for generating a fine droplet of a size long enough to float in the air according to the movement speed of the air; A fine droplet transport means for transporting a plurality of fine droplets generated by the fine droplet generating means to the air-cooled heat exchanger together with air in the atmosphere; The droplets during transportation are evaporated in the air to absorb the heat of vaporization, the air deprived of heat is cooled, the air-cooled heat exchanger is cooled by this cooling air air cooling system using the heat of vaporization. The method of claim 1, The fine droplet generating means comprises a spray nozzle for aerosolizing the water (aerosolize) in order to increase the surface of the water in contact with the air. delete The method of claim 1, The droplets transport means is an air cooling system using a vaporization heat, characterized in that for transporting the fine droplets and comprises a blower for evenly distributed in the air. The method of claim 1, Temperature measuring means for measuring the atmospheric temperature; By comparing the measured air temperature with the set target temperature, if the air temperature exceeds the target temperature, the micro water droplet generating means and the micro water droplet transporting means are driven; on the contrary, if the air temperature is lower than the target temperature, the micro water droplet generating means and the micro water droplet Air cooling system using the heat of vaporization, characterized in that it further comprises a cooling control means for stopping the transport means. delete delete delete A first step of generating fine water droplets that are long enough to float in the air according to the moving speed of the air and spraying the same into the air; A second step of transporting the droplets injected in the first step together with air in the air to an air-cooled heat exchanger; A third step of generating cooling air by evaporating the droplets in the air by absorbing vaporization heat in the air; And a fourth step of cooling the air-cooled heat exchanger by using the cooling air generated in the third step. The method of claim 9, As the pretreatment step before the first step Temperature measurement process to measure the atmospheric temperature Comparing the measured atmospheric temperature and the set target temperature, and further comprising a cooling control process for performing the first step to the fourth step only when the atmospheric temperature exceeds the target temperature air cooling using vaporization heat Way.