JPS5844316B2 - air cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air cooling device for cooling high temperature dry air.

Generally, in equipment such as steel plants, when clean cooling air is sent to a large electrical room that houses various electrical equipment to cool the electrical equipment, the outside air is filtered through an air filter to remove dust and
After filtering, the air is sent into a warm room using a blower.

However, in recent years, many steel plants and other plants have been built in the Middle East, where outside air is hot and dry, but in this region it is difficult to directly take outside air into the electrical room. However, it is impossible to maintain a maximum ambient temperature of 40°C for electrical equipment housed in an electrical room, and therefore, as a means of cooling the outside air at a predetermined temperature, sensible heat is installed between the air filter and the blower. A method is adopted in which a water-cooled multi-tube heat exchanger with an exchange function is installed, the high temperature dry outside air is cooled by this heat exchanger, and the cooled air is supplied to the electrical room. Cooling methods similar to those described above are used as needed not only in the Middle East, but also in cases where it is desired to cool high-temperature dry air, such as when reusing exhaust gas from special chemical plants and boilers.

However, in such conventional high-temperature dry air cooling methods, the cooling effect is extremely poor due to the indirect cooling method of water to air, resulting in an increase in the size and weight of the cooling device and an increase in the installation space. Since heat exchangers such as multi-tube type heat exchangers are used, a large amount of passing or circulating cooling water is required, and troublesome maintenance work such as cleaning the heat exchanger cooling tubes is also required. There are various disadvantages.

In view of these points, the present invention provides a high-temperature dry air cooling device that does not have the above-mentioned disadvantages and has high cooling efficiency by effectively utilizing the characteristics of high-temperature dry air as an object to be cooled and by utilizing the evaporation effect of water. The purpose is to

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the air cooling device of the present invention. The inside of the casing 1 of the air cooling device is divided into upper and lower halves by a partition wall 2, and the upper chamber 3 constitutes a circulating water cooling section. The lower chamber 4 constitutes an air cooling section.

A filling material 5 is disposed in the upper chamber 3 IF- constituting the circulating water cooling section for direct contact and cooling of the circulating water and air. A water sprinkling device 6 for sprinkling circulating water is provided.

In the past, a first air intake lower was formed on one side wall of the upper chamber 3 to take in the first air for cooling the circulating water, and an air outlet was formed on the other earthen wall of the upper chamber 3. An outlet 8 is formed, and a blower 9 is provided at the air outlet 8 for discharging the first air outdoors.

On the other hand, an upper chamber 3 constituting a circulating water cooling section is provided in the partition wall 2.
A water receiving tank 10 having a large number of water sprinkling ports at the bottom is provided below the filler 5 provided therein, and below the water receiving tank 10 in the lower chamber 4 constituting the air cooling section,
A filler 11 is provided for direct contact and heat exchange between the circulating water falling from the water receiving tank 10 and the second air.

Further, a second air intake port 12 is formed in the lower part of the first air intake lower part of the upper chamber 3 to take in second air, which is a body to be cooled, into the lower chamber 4. On the other side wall of the lower chamber 4 is an air discharge port 13 that opens into an electrical room, etc.
A blower 1 is provided below the air outlet 13 on the indoor side for pushing cooled air into the electrical room or the like.
4 and an eliminator 15 that prevents water droplets of circulating water from scattering into the electrical room.

In this case, the 5 parts of filler applied to the circulating water cooling section is constructed so that the circulating water can easily evaporate, and the filling material applied to the circulating water cooling section is designed so that the circulating water can easily evaporate.
The 11 parts of the filling material are configured so that the contact area between the air and the circulating water is approximately the same.

Furthermore, a water storage tank 16 for storing circulating water is provided below the lower chamber 4 constituting the air cooling section.
6 includes a circulating water pipe 19 that circulates the circulating water in the water storage tank 16 through a strainer 17 and a circulating water pump 18 with a water sprinkler 61 of the circulating water cooling unit, and supplies circulating water to the water storage tank 16. A make-up water device 20 is connected thereto.

First, the circulating water piping 19 pumped up from the water tank 16 by the circulating water pump 18 is sent to the water sprinkling device 6 in the upper chamber 3 constituting the circulating water cooling section, and is then charged from the water sprinkling device 6. Water is sprinkled on the wood 5 and the first air intake port 1
The first air for cooling the circulating water introduced into the upper chamber 3 from above is brought into direct contact and heat exchanged with the above-mentioned 5 parts of the filler material, thereby being cooled.

In this case, if the temperature of the circulating water sprinkled on the filling material part is quite high and the first air is very dry, the circulating water will be circulated by evaporation of a portion of the circulating water rather than by the amount of sensible heat that the circulating water gains from direct contact. Since the amount of latent heat lost by the water increases, the temperature of the circulating water decreases, and the water falls to the water receiving tank 10 provided below the filler 5 and is collected.

On the other hand, the first air supplied to the optical fiber member 5 for cooling the circulating water is heated and discharged outdoors by the blower 9.

The circulating water collected in the water receiving tank 10 is sprayed from a large number of water sprinkling ports provided at the bottom of the housing onto the filling material 11 in the lower chamber 4 that constitutes the air cooling section, where it is sucked in by the blower 14. It directly contacts and exchanges heat with the second air, which is the object to be cooled, and after cooling the air, it is collected in the water storage tank 16.

By the way, in the case of heat exchange between the circulating water and the second air in this air cooling section, the heat exchange phenomenon in the circulating water cooling section is opposite, and the dry bulb temperature of the second air, which is the body to be cooled, is higher than the dry bulb temperature of the second air. The temperature of the circulating water sprinkled from the water receiving tank 10 is lower, and when the circulating water comes into direct contact with the air, the amount of sensible heat gained through direct contact with the air is greater than the amount of latent heat that the circulating water loses due to evaporation. The second air is cooled, and the temperature of the circulating water increases.

On the other hand, the second air cooled by the 11 parts of the optical insulation material is
After water droplets scattered in the air are removed by the eliminator 15, air is forced into the electrical room by the blower 14 through the air outlet 13 and is used to cool the electrical equipment.

By the way, as mentioned above, when the circulating water and air come into direct contact in each of the fillers 5 and 11, dust in the air is removed by the circulating water and collected in the water storage tank 16 together with the circulating water. The circulating water piping 19 is equipped with a strainer 17, so that the water in the water storage tank 16 is
The dust collected during this period will not be sent to the water sprinkler 6.

The shortage of circulating water that is lost due to long-term continuous operation of this device is continuously or intermittently replenished into the water storage tank 16 by the makeup water device 20.

Figure 2 is a psychrometric diagram for explaining the state changes of circulating water and air, that is, the cooling effect. When a temperature of 43℃ and a relative humidity of 4 ql) is exchanged with circulating water in the air cooling section, the cooled and stable air apparently receives no heat from the outside and transfers it. Point B is on the constant enthalpy (20.4 Kcal/&f) line (temporarily dry bulb temperature is 35°C and relative humidity is 54%).

On the other hand, when a stable state is reached, the difference in heat gain and loss between the circulating water and the air disappears, so the circulating water temperature also becomes near the intersection C (water temperature 26.8° C.) between the constant enthalpy line at point A and the saturation curve.

Once upon a time, if the circulating water temperature is higher than the water temperature at point C at startup, the amount of latent heat lost due to water evaporation will be greater than the amount of sensible heat gained by the circulating water, and the circulating water temperature will drop. On the other hand, if the circulating water temperature is lower than the water temperature at point C at startup, the amount of sensible heat gained by the circulating water is greater than the amount of latent heat lost, and the circulating water temperature shows an upward trend, and in both cases, the enthalpy remains constant. point C on the line
It operates to approach fC, and the circulating water temperature stabilizes near point C.

However, as shown in the above embodiment, in the case of a device having a circulating water cooling section, the circulating water is forcibly cooled in the circulating water cooling section, and the temperature of the circulating water sent to the air cooling section is lower than point C. If the temperature is set to point E (e.g., water temperature 22.8°C), the amount of evaporation of the circulating water will be reduced compared to the operating state at point C, and the cooled air will reach point D on straight line AE (e.g., dry bulb temperature). 35° C., relative humidity 46), and the relative humidity of the cooling air can be kept lower than that without a circulating water cooling section.

In this way, in the present invention, high-temperature dry air in the same state is used on the one hand for circulating water for cooling, and on the other hand as an object to be cooled, and the evaporation effect of water is effectively used to effectively cool the high-temperature dry air. can do.

The above device may also be provided with a cooling capacity control mechanism for fluctuations in outside temperature.

That is, FIG. 3 is a diagram showing an embodiment in which a cooling capacity control mechanism is provided, and a temperature detector 21 is provided near the air discharge port 13 to detect the temperature on the discharge side of the cooled second air. It is being

The output signal from the temperature detector 21 is applied to the flow rate control device 22, and the rotation speed of the drive motor 23 of the circulating water pump 18 is controlled by the output signal from the flow rate control device 22, and the rotation speed of the drive motor 23 of the circulating water pump 18 is controlled. The cooling capacity of the cooling system can be adjusted by changing the amount of water flowing to the sprinkler system.

Therefore, when the first outside temperature decreases, the second
The temperature on the discharge side of the air also decreases.

Therefore, the temperature on the discharge side of the second air is determined by the temperature detector 21.
When the air temperature is detected by i-li and becomes below a predetermined temperature, the flow rate control device 22 is activated and the circulating water pump 1 is activated.
8 is reduced, and the amount of water flowing to the water sprinkler 6 is accordingly reduced.

Therefore, the temperature of the circulating water sprinkled on the air cooling section becomes high, and the cooling capacity is reduced.

On the other hand, when the measured temperature becomes high, the rotational speed of the circulating water pump is increased to increase the amount of water flowing, thereby increasing the cooling capacity.

By controlling the speed of the circulating water pump, that is, controlling the amount of water flowing to the water sprinkler in this manner, the temperature of the air discharged into the electrical room etc. can be stabilized near a desired temperature.

In the above embodiment, the cooling capacity is controlled by controlling the rotation speed of the circulating water pump, but as shown in FIG. It is also possible to control the amount of water flowing to the water sprinkler 6 by adjusting the amount of water.

FIG. 5 shows a system in which the cooling capacity of the device is controlled by controlling the flow rate of the first air flowing through the circulating water cooling section, and the filling material 5 provided in the circulating water cooling section is An electric damper 26 that is opened and closed by a drive motor 25 is provided on the front side (air intake side) of the
The drive motor 25 is controlled via the air volume controller 27 in accordance with the temperature detected by the temperature detector 21, and the opening degree of the electric damper 26 is adjusted.

When the temperature measured by the temperature detector 21 becomes lower than the required set temperature, an instruction is given to reduce the opening degree of the drive motor 25vCt dynamic damper 26, and the electric damper is moved in the closing direction. controlled by.

When the electric damper 26 is controlled in the closing direction in this manner, the amount of air passing through the circulating water cooling section decreases along the air amount curve shown in FIG.

Therefore, the temperature drop of the circulating water is reduced, which reduces the cooling capacity of the air cooling section (Figure 6).
, the temperature of the discharged air increases.

Conversely, when the temperature of the discharged air is high and the measured temperature exceeds the required set temperature, the output signal increases the opening degree of the electric damper 26, and the flow rate of air passing through the circulating water cooling section increases accordingly. Vaporization is promoted.

Therefore, the temperature of the circulating water supplied to the air cooling section is lowered, the cooling capacity of the air is increased, and the temperature of the discharged air is lowered to the predetermined temperature 1.

In this way, the temperature of the discharged air is always adjusted to be close to the set temperature even when the outside air temperature changes.

Note that the means for controlling the flow rate of the first air passing through the circulating water cooling section may include controlling the number of rotations of the blower 90 for discharging the first air into the atmosphere.

Further, in each of the above embodiments, the circulating water cooling section is arranged above the air cooling section, but the air cooling section may be arranged above the circulating water cooling section.

Furthermore, both or one of the cooling parts may be divided into multiple parts in parallel or in series, and the filler of both or one of the circulating water cooling part and the air cooling part can be omitted, and the water droplets and the air can be divided into two or more parts. They may be brought into direct contact without any intervening material.

As explained above, in the air cooling device of the present invention, unlike the conventional indirect cooling method, the air is cooled by a direct contact cooling method, so the cooling efficiency can be dramatically improved, and the required cooling The amount of water is also reduced and water resources can be saved.

Also, since it does not use a shell-and-tube heat exchanger as in the past,
It is possible to simplify the structure of the air cooling device, make it smaller and lighter, and also reduce the installation space and simplify the maintenance of various equipment in the circulating water circulation system.

Furthermore, since it has a circulating water cooling section, the temperature of water sprayed to the air cooling section can be lowered, and the relative humidity on the outlet side of the air to be cooled can be kept as low as possible. If installed, the air outlet temperature can always be stabilized within the optimum usage range regardless of outside air fluctuations, and this will improve the operating environment and reliability of electrical equipment stored inside electrical rooms, etc. It is possible to achieve the following effects.

Moreover, since the present invention effectively takes advantage of the characteristics of the high-temperature dry air that is the object to be cooled and utilizes the evaporation effect of water, the operating power of the entire cooling system can be reduced, and the direct contact cooling method Therefore, the dust in the air is captured by the circulating water, and there is no need to provide a special filtration device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the air cooling device of the present invention, FIG. 2 is an explanatory diagram of the operation of the present invention, and FIGS. 3 and 4 are cooling capacity control devices each consisting of a circulating water amount control device. FIG. 5 is a vertical sectional view showing an air cooling device having a cooling capacity control mechanism consisting of a device for controlling a first air flow rate flowing through a circulating water cooling section. FIG. 6 is a diagram showing the relationship between the damper opening degree, the cooling capacity, and the air volume. DESCRIPTION OF SYMBOLS 1... Casing, 3... Upper chamber, 4... Lower chamber, 5゜11... Filling material, 6... Watering device, 10 Water tank, 16... Water tank, 18...・Circulating water pump, 2
1... Temperature detector, 24... Circulating water flow rate adjustment valve, 2
6...Electric Dan)S.

Claims (1)

[Claims] 1. A circulating water cooling section that cools the circulating water through direct contact and heat exchange between the circulating water and the first air, and the circulating water and the second air cooled in the circulating water cooling section. and an air cooling unit that cools the second air by direct contact and heat exchange with the second air, and are arranged above and below each other, and the circulating water flowing out from the air cooling unit is again supplied to the circulating water cooling unit. An air cooling device characterized by: 2. The air cooling device according to claim 1, wherein the circulating water cooling section is disposed above the air cooling section. 3. The air cooling device according to claim 1, wherein the air cooling section is disposed above the circulating water cooling section. 4. A circulating water cooling section that cools the circulating water through direct contact and heat exchange between the circulating water and the first air, and a direct contact between the circulating water cooled in the circulating water cooling section and the second air. - Air cooling units that exchange heat and cool the second air are arranged above and below each other, and the circulating water flowing out from the air cooling unit is supplied again to the circulating water cooling unit, and the air cooling unit 1. An air cooling device comprising: a temperature detector for detecting the temperature of discharge air cooled in the cooling section; and a circulating water flow rate control device operated by the temperature detected by the temperature detector. 5. The air cooling device according to claim 4, wherein the rotation speed of the circulating water pump is controlled based on the temperature detected by the temperature detector, and the flow rate of the circulating water is controlled. 6. The air cooling device according to claim 4, wherein the circulating water amount control valve is controlled based on the temperature detected by a temperature detector. T A circulating water cooling unit that cools the circulating water through direct contact and heat exchange between the circulating water and the first air, and a circulating water cooling unit that cools the circulating water by direct contact and heat exchange between the circulating water and the second air that have been cooled in the circulating water cooling unit. and an air cooling unit for exchanging and cooling the second air are disposed above and below each other, and the circulating water flowing out from the air cooling unit is again supplied to the circulating water cooling unit, and the air cooling unit a temperature detector that detects the temperature of the discharged air that has been cooled immediately; and an air volume control that is operated based on the temperature detected by the temperature detector and controls the flow rate of the first air flowing through the circulating water cooling section. An air cooling device characterized by being provided with a device. 8 Depending on the temperature detected by the temperature detector, the first
8. The air cooling device according to claim 7, wherein the rotational speed of a blower provided in the air flow path is controlled. 9. The air cooling device according to claim 7, wherein the first air flow path is provided with an electric damper device that is controlled by the temperature detected by a temperature detector.