JP2006177578A - Spray system for lowering temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spray system for lowering a temperature having high cooling energy efficiency, preventing a person passing under the system from being wetted, and constituted by using a structure of various heights. <P>SOLUTION: In this spray system for lowering a temperature of an object space by spraying the water as mist, an installation height of a spray nozzle for spraying the water as mist and a mist spraying quantity are determined on the basis of Sauter's mean diameter of the mist sprayed from the spray nozzle. The installation height of the spray nozzle is 3.5-6 m, and the spraying quantity is 3-20 cm<SP>3</SP>/m<SP>2</SP>min, when the Sauter's mean diameter is 10-22 μm, the installation height of the spray nozzle is 6-10 m, and the spray quantity is 3-40 cm<SP>3</SP>/m<SP>2</SP>min, when the Sauter's mean diameter is 15-27 μm, and the installation height of the spray nozzle is 10-16 m, and the spraying quantity is 6-80 cm<SP>3</SP>/m<SP>2</SP>min, when the Sauter's mean diameter is 20-30 μm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a temperature lowering spray system which is provided in a customer collection facility such as a pavilion of an exposition and uses a cooling action by latent heat due to mist evaporation.

  Conventional spraying systems for temperature drop are spray nozzles installed in structures such as pillars built at or near the entrance of customer-collecting facilities, pumps that supply pressurized water to the spray nozzles, and pressurized water from the pump to the spray nozzles. It is made up of distribution pipes. And when cooling is needed, mist is sprayed from the spray nozzle, and the customer collection facility is cooled by the latent heat accompanying transpiration of the mist (for example, refer patent document 1).

JP-A-6-109341

However, if a new pillar is built so that spraying can be performed from an appropriate position, there is a problem that the cost increases and the system becomes unsuitable for practical use.
Therefore, it is possible to reduce the cost of the system by installing the spray nozzle on the existing structure, but it is difficult to cool the target space properly because the height of the existing structure is various. There's a problem. For example, if the mist is sprayed from a spray nozzle equipped on a structure having a height exceeding 10 m like a normal utility pole, the cooling effect cannot be sufficiently exhibited. In addition, when the mist is sprayed from a spray nozzle mounted on a structure having a height of less than 10 m such as a normal street light, there is a problem that a large water droplet wets a person passing underneath.
In addition, when trying to reduce the diameter of the mist that is always sprayed and using a two-fluid jet using high-pressure air, the size of the mist can be reduced to 10 μm or less, and a spray nozzle is installed in a structure with a low height. However, in order to supply high-pressure air, a very large amount of energy must be consumed, and the cooling energy efficiency is poor.

  An object of the present invention is to provide a cooling system for cooling, which is constructed using various structures having a high cooling energy efficiency and does not wet a person passing underneath.

  The spray system for temperature drop according to the present invention is a spray system for temperature drop that sprays water as a mist to lower the temperature of the target space. The installation height of the spray nozzle that sprays water as a mist and the spray amount of the mist are as described above. It is set based on the Sauter average particle diameter of the mist sprayed from the spray nozzle.

  The effect of the temperature lowering spray system according to the present invention is that the installation height of the spray nozzle and the spray amount of the mist are set based on the Sauter average particle diameter of the mist, so that the cooling can be appropriately performed without getting a person wet. In addition, when an existing structure with various heights is equipped with a spray nozzle, if the Sauter average particle size of the mist is adjusted based on the height of the structure, it can be cooled appropriately without getting people wet. .

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a temperature lowering spray system according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the spray head according to the first embodiment. FIG. 3 is a cross-sectional view of the spray head according to the first embodiment. FIG. 4 is a cross-sectional view taken along the central axis of the spray nozzle according to the first embodiment. FIG. 5 is a particle size distribution diagram of mist sprayed from the spray nozzle. FIG. 6 is a diagram illustrating a state where mist is sprayed from the spray nozzle. FIG. 7 is a configuration diagram of the pressurized water supply device. FIG. 8 is a functional block diagram of the mist control panel. FIG. 8 is a timing chart of mist spraying.
2 is a partial cross-sectional view of the spray head as viewed downward from the BB cross-section of FIG. 3 is a cross-sectional view of the spray head as viewed in the horizontal direction from the AA cross section of FIG.

As shown in FIG. 1, the spray system 1 for cooling a temperature according to the first embodiment includes a spray head 3 provided at the tips of two pillars 2 that stand vertically from the ground, and pressurized water supplied to the spray head 3. Is provided with a sub-distribution pipe 4 through which water is introduced, a pressurized water supply apparatus 5 that supplies pressurized water via the sub-distribution pipe 4, and a temperature and humidity meter 6 that measures the ambient temperature and humidity and transmits the measured temperature and humidity to the pressurized water supply apparatus 5. . Water is supplied from the water supply 7 to the pressurized water supply device 5. In addition, although the two pillars 2 are described as an example, the number may be determined as appropriate according to the size of the facility to be cooled.
Moreover, although the spray head 3 described having been provided at the front-end | tip of the pillar standing upright from the ground, you may suspend from the ceiling.

As shown in FIG. 2, the spray head 3 distributes the pressurized water introduced through the sub-distribution pipe 4 so that the pressure is uniformly applied to the six spray nozzles 10. The six extension pipes 12 provided for the separation of the distance, and the six spray nozzles 10 for spraying by using pressurized water as a mist. And the installation height of the spray nozzle 10 is 4 m. The installation altitude of the spray nozzle 10 is set based on the Sauter average particle size and 90% cumulative volume particle size of the mist.
Here, it is described that the six spray nozzles 10 are provided in the spray head 3, but the present invention is not limited to this, and the number of spray nozzles 10 may be one to N.

  As shown in FIGS. 2 and 3, the spray header 11 is a hexagonal column in which a central axis is arranged in a vertical direction and a cavity 15 having a hexagonal section is formed inside. A hole 16 to which the sub-distribution pipe 4 is connected is provided at the center of the lower end face of the hexagonal column, and the outside and the cavity 15 having a hexagonal cross section communicate with each other. A hole 17 to which the extension pipe 12 is connected is provided at the center of each side surface of the hexagonal column, and the outside and the cavity 15 having a hexagonal cross section communicate with each other. The pressurized water is poured from the holes 16 on one end face and supplied to the extension pipe 12 from the holes 17 on the six side faces. The spray header 11 is made of stainless steel.

As shown in FIG. 3, the extension pipe 12 is a cylindrical tube, one end of which is vertically attached to the side surface of the spray header 11, is bent downward in the longitudinal direction, and the other end is the spray header 11. The central axis of the cylindrical tube is inclined from the horizontal plane including the lower end face of the lower side so as to bow at an angle θ = 22.5 °. The extension pipe 12 is made of stainless steel.
A straight pipe 18 is attached to the other end of the extension pipe 12, and the spray nozzle 10 is fitted therein. In addition, the water pressure applied to the pressurized water receiving cavity 21 of the spray nozzle 10 with a pressure converter (model PVD-100ka, measurement range 0 to 10 MPa) 14 branched from one straight pipe 18 is attached. Is measured and used as the spray water pressure. Usually, the relationship between the spray water pressure and the output water pressure of the high-pressure pump is obtained in advance, and the spray water pressure is managed by managing the output water pressure of the high-pressure pump. A Bourdon tube pressure gauge or the like may be used for measuring the water pressure. The straight pipe 18 is made of stainless steel.
The central axis of the spray nozzle 10 connected in this way is inclined downward by an angle θ22.5 ° from a horizontal plane including the lower end face of the spray header 11.

  As shown in FIG. 4, the spray nozzle 10 has a substantially cylindrical housing 19. A section for receiving the pressurized water supplied via the extension pipe 12 along the central axis of the cylindrical housing 19 is located on the downstream side of the circular pressurized water receiving cavity 20 and the pressurized water receiving cavity 20. A rib 21 that accommodates a circular cavity 21 smaller than the diameter of the cavity 20 and a pressure-sensitive check valve 22 and has a cross section that is larger than the diameter of the cavity 21 and the outer edge of the downstream end face protrudes in the center direction. The partitioned valve storage cavity 24 and the piece 25 are accommodated, and are formed of a circular cavity 26 having a cross section equal to the diameter of the pressurized water receiving cavity 20 and a funnel-shaped cavity 27 continuous with the cavity 26. An orifice 29 connected to the tip of the jet generating cavity 28 and the funnel-shaped cavity 27 is provided continuously.

A pressure-sensitive check valve 22 that closes / opens the opening 21 a on the downstream side of the cavity 21 is inserted into the valve storage cavity 24.
When the pressure sensitive check valve 22 abuts the opening 21 a on the downstream side of the cavity 21, the blocking ball 30 that blocks the flow of pressurized water, one end contacts the blocking ball 30, and the other end is fixed to the rib 23. A spring 31 is bent so that a predetermined spring pressure is applied to the blocking ball 30.
When the water pressure in the cavity 21 exceeds a predetermined spring pressure, the blocking ball 30 and the opening 21a of the cavity 21 are separated from each other, and water flows into the valve housing cavity 24 from the gap.

Here, three types of spray nozzles 10 each having springs 31 having spring pressures of 0.2, 0.4, and 1.0 MPa when the blocking ball 30 is in contact with the opening 21a are prepared. The pressure was changed from 0 MPa to 2 MPa over 4 seconds, and the particle size of the sprayed mist was measured using a laser diffraction particle size measuring device (Malvern, Spraytec RTS5000). The measurement point was a location 50 mm away from the tip of the orifice 29 on the central axis of the spray nozzle 10. As a result, although not shown in the drawings, when the spring pressure is 0.2 MPa, rod-like water discharge is generated and the passerby is wetted.
As the spring pressure increases, the mist having a large diameter decreases. As shown in FIG. 5, the mist sprayed from the spray nozzle 10 having a spring pressure of 0.4 MPa is 90% cumulative volume particle diameter D (90 ) Becomes 160 μm or less, and a large diameter droplet does not fall and wet a passerby.
Furthermore, the mist sprayed from the spray nozzle 10 having a spring pressure of 1.0 MPa has a 90% cumulative volume particle size D (90) of 60 μm or less, and the mist does not hit a passerby.
Further, in the spray nozzle 10 having a predetermined spring pressure of 1.8 MPa close to the spray water pressure, the blocking ball 30 cannot be sufficiently separated from the opening 21a, so that the spray amount is restricted, and the spray pressure having a spring pressure of 1.5 MPa. In the nozzle 10, there is no restriction on the spray amount. For this reason, the predetermined spring pressure is preferably 0.6 MPa or more and 1.5 MPa or less.

  Further, in the jet generation cavity 28, the pressure water is ejected as a swirling jet, and the piece 25 for colliding with the inner surface of the funnel-shaped cavity 27 is in contact with the inner surface of the cylindrical cavity 26, and the direction of the central axis of the spray nozzle 10 Move while sliding. A spiral groove 32 is dug in the side surface of the piece 25, and a swirl flow path for swirling and ejecting pressurized water is formed by the groove 32 and the inner surface of the cylindrical cavity 26.

Next, a procedure for spraying pressurized water in the spray nozzle 10 will be described.
When pressurized water is poured into the pressurized water receiving cavity 20 and the water pressure reaches a predetermined value, the blocking ball 30 is pushed and the pressurized water flows into the valve housing cavity 24.
Then, pressurized water pushes one end face of the piece 25 from the hole 23 a formed in the center of the rib 23, and the piece 25 is moved along the central axis of the spray nozzle 10 toward the funnel-shaped cavity 27. The pressurized water passes through the groove 32 while being swirled, and is jetted from the end of the groove 32.
This jet collides with the inner surface of the funnel-shaped cavity 27 to become a collision jet and is sprayed from the orifice 29 as a mist.

Next, the sprayed mist will be described. The mist in this invention means the water droplet of a small diameter. The average particle diameter of the mist is an average value obtained by measuring the body area average particle diameter (referred to as Sauter average particle diameter) five times with a laser diffraction particle diameter measuring instrument.
When the spray water pressure was 6 MPa from the spray nozzle 10 used in Embodiment 1, the Sauter average particle size was 20 μm. In addition, when the spray water pressure is less than 2 MPa, the Sauter average particle size of the mist increases and the spray amount decreases, resulting in a reduced cooling effect. Further, when the spray water pressure is high, the average particle diameter of the mist is reduced and the spray flow rate is increased. However, if the spray water pressure exceeds 10 MPa, a large water hammer is applied to the piping and the like, which is not preferable for safety. For these reasons, the spray water pressure is preferably 2 MPa or more and 10 MPa or less. The average particle size of the mist is measured using a laser diffraction particle size measuring device, but may be measured using a Doppler phase particle size measuring device or the like. At this time, since the average particle size varies depending on the type of measuring instrument, it is necessary to measure and compare mist sprayed under the same conditions.

Next, the state of spraying mist will be described, and the spray region will be defined. As shown in FIG. 6, the mist is sprayed in a cone having a center line on the central axis of the spray nozzle 10 in the vicinity of the orifice 29 and having the exit of the orifice 29 as a vertex. This conical region is referred to as a spray region 34, and the apex angle of the cone is referred to as an injection angle 35. The side surface of the spray region 34 is referred to as a spray outer edge 36.
In the spray region 34, the injection angle 35 can be adjusted by adjusting the shape of the orifice 29. If the injection angle 35 is reduced, the mist can be blown far away, and if the injection angle 35 is increased, the mist drifts near the spray nozzle 10. Usually, it is preferable to set the injection angle 35 to about 45 degrees, but it is not limited to 45 degrees.
By adjusting the injection angle 35 in this way, the spray region 34 can be positioned below the horizontal plane that crosses the orifice 29.

When the wind is not blowing, the surrounding air is cooled by transpiration of the mist and a descending airflow is generated, so that the sprayed mist descends with the descending airflow. The mist evaporates during the descent. As the mist evaporates, latent heat is taken away from the air and the air is cooled.
On the other hand, when a horizontal wind is blowing on the ground, the mist is swept in the direction of the wind while descending. However, since the spray outer edge 36 is positioned below the horizontal plane including the lower end face of the spray header 11, the spray header 11 does not hit the mist even if it is flowed horizontally.
Further, since the spray region 34 is separated from the tip of the orifice 29 when viewed from the column 2 and the sub-distribution pipe 4, and the tip of the orifice 29 is separated from the column 2 and the sub-distribution pipe 4 by the extension pipe 12, the mist is horizontal. Even if it is flowed in the direction, it will diffuse or evaporate while moving by the length of the extension pipe 12, so that the mist does not hit the pillar 2 or the sub-distribution pipe 4.
Further, since the extension pipe 12 is bent downward, it is possible to prevent the mist from hitting the extension pipe 12 unless an upward wind blows.

  As shown in FIG. 7, the pressurized water supply device 5 includes a high pressure pump 40, a main valve 41 disposed on the downstream side of the high pressure pump 40, and a drain valve 43 that opens and closes a flow path for draining water in the main distribution pipe 42. A selection valve 44 that selects the supply of pressurized water to each spray head 3, a high-pressure pump 40, and a mist control panel 45 that controls various valves. The sub-distribution pipes 4 are connected to the selection valves 44, respectively. The dry bulb temperature and wet bulb temperature measured by the thermohygrometer 6 are input to the mist control panel 45.

The main valve 41 and the selection valve 44 are communicated with each other through the main water distribution pipe 42, and the drain valve 43 is communicated with the main water distribution pipe 42 through a drain pipe 46 branched from the middle of the main water distribution pipe 42. The main water pipe 42, the drain pipe 46, and the sub water pipe 4 are each made of stainless steel. The high pressure pump 40 and the main valve 41 are communicated with each other by a rubber blade hose 47 to smooth the pulsation generated by the positive displacement high pressure pump 40.
Further, in order to remove dust contained in the pressurized water, a 20 μm square opening filter (not shown) is interposed at the outlet of the high-pressure pump 40.
Further, in order to supply pressurized water with a small amount of metal ions so that scale does not deposit on the main water distribution pipe 42, the sub water distribution pipe 4, and the spray head 3, tap water softened from a water softener (not shown) is supplied to the high pressure pump 40. Have been supplied.

  As shown in FIG. 8, the mist control panel 45 includes a spray determining means 50 for determining whether or not spraying is possible based on the dry bulb temperature and wet bulb temperature measured by the thermohygrometer 6, and if spraying is possible, the spray amount is determined. A water supply amount control means 51 for controlling the amount of water supplied from the high-pressure pump 40, a spray sequence control means 52 for controlling the high-pressure pump 40 and various valves, and an air diagram database 53 in which wet air diagrams are stored. Have. The mist control panel 45 is composed of a computer having a CPU, a RAM, a ROM, and an interface circuit.

Next, a sequence for supplying pressurized water from the high-pressure pump 40 will be described with reference to FIG.
The spray sequence control means 52 of the mist control panel 45 first opens the main valve 41. At the same time, the drain valve 43 is opened.
Next, the spray sequence control means 52 starts the operation of the high-pressure pump 40 and supplies pressurized water from the blade hose 47 to the main water distribution pipe 42. As a result, the air remaining in the main water distribution pipe 42 is pushed out together with the water from the drain valve 43, and a uniform water pressure is applied in the main water distribution pipe 42.
Next, the spray sequence control means 52 closes the drain valve 43. Thereby, the water pressure in the main water distribution pipe 42 reaches a desired water pressure, for example, 6 MPa.
Next, the spraying sequence control means 52 opens the selection valve 44 connected to the spraying head 3 that performs spraying, and the pressurized water is propagated as the rising pressure wave through the sub-distribution pipe 4, and water is supplied to the spraying head 3. Is done. At this time, the water pressure applied by being poured into the pressurized water receiving cavity 20 reaches approximately 0 MPa to 6 MPa in 4 seconds. When the water pressure becomes 1 MPa or higher in this way, the pressure-sensitive check valve 22 of the spray nozzle 10 is opened and spraying of mist is started.

On the contrary, when the spraying of the mist is finished, the spray sequence control means 52 opens the drain valve 43 so that the descending pressure wave is propagated in the child water distribution pipe 4, and the water pressure in the pressurized water receiving cavity of the spray nozzle 10 is changed. Since the pressure is reduced to 1 MPa or less, the pressure-sensitive check valve 22 is closed, and mist spraying is stopped.
Then, after about 3 seconds from the opening of the drain valve 43, the operation of the high-pressure pump 40 is stopped and the selection valve 44 is closed. Thereafter, the main valve 41 and the drain valve 43 are closed.

Thus, after the water pressure in the main water distribution pipe 42 is once stabilized to a desired value, water is supplied to the child water distribution pipe 4, so that the pressure of the pressurized water supplied to the spray nozzle 10 is several seconds as shown in FIG. Between 0 MPa and 6 MPa. And since the pressure sensitive check valve 22 is suddenly opened and the spraying time can be shortened when the water pressure is low, most of the mist having a large particle size seen when spraying when the water pressure is low. It is not sprayed.
Further, as shown in FIG. 11, when the drain valve 43 is opened, the water pressure in the main water distribution pipe 42 suddenly drops, the pressure sensitive check valve 22 is suddenly closed, and the time for spraying in a low water pressure state is reached. Since it can be shortened, mist having a large particle size seen when sprayed at a low water pressure is hardly sprayed.

  In addition, when a plurality of sub-distribution pipes 4 are connected to the main distribution pipe 42, all the sub-distribution pipes 4 may be simultaneously communicated to distribute water to all the spray heads 3. As shown in FIG. 9, one selection valve 44 is first opened to start spraying from the spray head 3 connected thereto, and then the other selection valve 44 is opened to simultaneously open the selection valve 44. From time to time, the water pressure applied to the spray nozzle 10 suddenly reaches the spray water pressure, the time during which the water pressure is low is short, and water droplets having a large diameter can be prevented from falling.

Next, a method for setting the spray amount of mist will be described with reference to FIGS.
As a premise, the sprayed mist is evaporated in at least one minute. The length of the extension pipe 12 is 15 cm, and the amount of spray is determined assuming that the mist sprayed from the spray nozzle 10 exists within 1 m ³ .
The spray determination means 50 calculates the relative humidity RH (%) based on the wet air diagram from the dry bulb temperature DT (° C.) and the wet bulb temperature WT (° C.) input from the thermohygrometer 6. For example, as shown in FIG. 12, when the dry bulb temperature DT is 30 ° C. and the wet bulb temperature WT is 20 ° C., the wet bulb temperature WT shown on the horizontal axis of the wet air diagram is vertically 20 ° C. A dew point DP that extends in the axial direction and intersects the line with a relative humidity of 100% is obtained. The absolute humidity AH (kg / kg ′) is obtained by extending from the dew point DP in the horizontal axis direction. In the example shown in FIG. 12, the absolute humidity AH is 0.015 kg / kg ′. Further, an intersection B between a line extending in the horizontal axis direction from the dew point DP and a line in which the dry bulb temperature DT expressed in the horizontal axis of the wet air diagram is extended from 30 ° C. in the vertical axis direction is obtained. . Then, the relative humidity RH (%) at which the intersection point B intersects is obtained. In the case of FIG. 12, the relative humidity RH is 65%.

  Next, when the relative humidity RH is 75% or more, the spray determination unit 50 does not feel that the sensory temperature has decreased because the relative humidity is too high even if the mist is sprayed. . On the contrary, when the relative humidity RH is less than 75%, it is felt that the sensory temperature is lowered by spraying the mist, so that the mist is sprayed.

Next, the water supply amount control means 51 has a hot threshold value HHT _TH (shown by a thick alternate long and short dash line in FIGS. 12 and 13) or a slightly hot threshold value LHT _TH (FIG. 12). In FIG. 13, it is indicated by a thick dotted line.) Whether or not this is the case is determined, and the spray amount is obtained. That is, as shown in FIG. 12, when the dry bulb temperature DT is equal to or higher than a predetermined hot threshold LHT _TH , based on the wet air diagram, an isoenthalpy line at which the intersection point B intersects and the dry bulb temperature DT is 1 ° C. An intersection point C with a line extending in the vertical axis direction from a low temperature is obtained. Then, the absolute humidity AH ′ (kg / kg ′) is obtained by extending from the intersection C in the horizontal axis direction. Then, the absolute humidity AH ′ is subtracted from the absolute humidity AH ′ to obtain the mist spray amount JW (kg). This spray amount JW is an amount that can lower the temperature by 1 ° C. by spraying in a space of 1 m ³ per minute. In FIG. 12, since the absolute humidity AH is 0.015 kg / kg ′ and the absolute humidity AH ′ is 0.0155 kg / kg ′, the mist spray amount JW is 0.0005 kg. Then, it is possible to 1 ℃ cooling by spraying a mist of 1 m ³ per 0.0005kg per minute.

Further, as shown in FIG. 13, when the dry bulb temperature DT is equal to or higher than a predetermined hot threshold value HHT _TH , based on the wet air diagram, a temperature 2 ° C. lower than the enthalpy line at which the intersection E intersects and the dry bulb temperature DT The intersection point F with the line extending in the vertical axis direction from is obtained. Then, the absolute humidity BH ′ (kg / kg ′) is obtained by extending from the intersection point F in the horizontal axis direction. Then, the absolute humidity BH ′ is subtracted from the absolute humidity BH ′ to obtain the mist spray amount JW. In FIG. 13, since the absolute humidity BH is 0.0198 kg / kg ′ and the absolute humidity BH ′ is 0.0208 kg / kg ′, the mist spray amount JW is 0.001 kg. Then, it is possible to 2 ℃ cooling by spraying a mist of 1 m ³ per 0.001kg per minute.

Thus, when the Sauter average particle diameter of the mist sprayed from the spray nozzle 10 is 20 μm and the 90% cumulative volume particle diameter D90 of the mist is less than 80 μm, the person who passes below even if the installation height of the spray nozzle 10 is 4 m. Can be cooled to a desired temperature, for example, 1 ° C. or 2 ° C. without wetting.
Therefore, experiments were conducted on whether or not a person gets wet when the Sauter average particle diameter of the mist, the installation height of the spray nozzle 10 and the spray amount are changed, and the cooling effect.
FIG. 14 shows the experimental results relating to the cooling effect and human wetting when the Sauter average particle size is 10 μm or more and 22 μm or less, and the 90% cumulative volume particle size D90 of mist is adjusted to less than 80 μm. In this experiment, the spray amount was changed to ² , ^3, 10, ²⁰ , and 22 cm ³ / m ² · min. Further, the installation height of the spray head 10 was changed to 3, 3.5, 6, and 6.5 m.
As can be seen from FIG. 14A showing the experimental results regarding the cooling effect, the cooling effect was NG regardless of the installation height when the spray amount was 2 cm ³ / m ² · min. Further, the cooling effect was NG even when the spray amount was 3 cm ³ / m ² · min and the installation height was 6.5 m.
Further, as can be seen from FIG. 14 (b) showing the experimental results regarding human wetting, when the installation height is 3 m and the spray amount is 10, 20, 22 cm ³ / m ² · min, the human is wet and the installation height is 3 Even when the spray amount is 22 cm ³ / m ² · min at 0.5 m, people get wet. Thus, when the Sauter average particle diameter is 10 μm or more and 22 μm or less and the 90% cumulative volume particle diameter D90 of the mist is less than 80 μm, the spray amount is 3 cm ³ / m ² · min or more and 20 cm ³ / m ² · min or less. It turns out that it is preferable. The installation height is preferably 3.5 m or more and 6 m or less.

FIG. 15 shows the experimental results on the cooling effect and human wetting when the Sauter average particle size exceeds 15 μm and is 27 μm or less, and the 90% cumulative volume particle size D90 of mist is adjusted to 80 μm or more and less than 100 μm. In this experiment, the spray amount was changed to ² , ³ , 20, 40, and 44 cm ³ / m ² · min. Further, the installation height of the spray head 10 was changed to 5, 6, 10, 11 m.
As can be seen from FIG. 15A showing the experimental results regarding the cooling effect, the cooling effect was NG regardless of the installation height when the spray amount was 2 cm ³ / m ² · min. Further, the cooling effect was NG even when the spray amount was 3 cm ³ / m ² · min and the installation height was 11 m.
Further, as can be seen from FIG. 15 (b) showing the experimental results regarding human wetting, when the installation height is 5 m and the spray amount is 20, 40, 44 cm ³ / m ² · min, the person gets wet and the installation height is 6 m. When the spray amount is 44 cm ³ / m ² · min, the person gets wet. Thus, when the Sauter average particle size exceeds 15 μm, 27 μm or less, and the 90% cumulative volume particle size D90 of the mist is 80 μm or more and less than 100 μm, the spray amount is 3 cm ³ / m ² · min or more and 40 cm ³ / m ^2. It can be seen that min or less is preferable. The installation height is preferably 6 m or more and 10 m or less.

FIG. 16 shows the experimental results on the cooling effect and human wetting when the Sauter average particle size exceeds 20 μm and is 30 μm or less, and the 90% cumulative volume particle size D90 of mist is 100 μm or more and less than 120 μm. In this experiment, the spray amount was changed to ⁴ , 6, 40, 80, and 86 cm ³ / m ² · min. Further, the installation height of the spray head 10 was changed to 9, 10, 15, 16 m.
As can be seen from FIG. 16A showing the experimental results regarding the cooling effect, the cooling effect was NG regardless of the installation height when the spray amount was 4 cm ³ / m ² · min. Further, the cooling effect was NG even when the spray amount was 6 cm ³ / m ² · min and the installation height was 16 m.
Further, as can be seen from FIG. 16 (b) showing the experimental results regarding human wetting, when the installation height is 9 m and the spray amount is 40, 80, 86 cm ³ / m ² · min, the person gets wet and the installation height is 10 m. When the spray amount is 86 cm ³ / m ² · min, the person gets wet.
Thus, when the Sauter average particle diameter exceeds 20 μm, 30 μm or less, and the 90% cumulative volume particle diameter D90 of the mist is 100 μm or more and less than 120 μm, the spray amount is 6 cm ³ / m ² · min or more and 80 cm ³ / m ^2. It can be seen that min or less is preferable. The installation height is preferably 10 m or more and less than 16 m.

  Such a temperature lowering spray system 1 can be appropriately cooled without getting a person wet by adjusting the particle size of the mist and the amount of spray according to the installation height of the spray nozzle 10, so there are various heights. The structure can be used.

  Also, since the mist sprayed from the orifice 29 is below the horizontal plane crossing the orifice 29, the mist hits the sub-distribution pipe 4 and so on to form a droplet, falls downward, and below the sub-distribution pipe 4 and the like It is possible to prevent the person who is present from getting wet.

  In addition, since the child water distribution pipe 4 rising from the ground is connected to the spray header 11 at the lower end face, the sprayed mist is separated from the child water distribution pipe 4 by the extension pipe 12 even if the sprayed mist flows in the wind. However, the dew condensation does not occur on the child water distribution pipe 4 or the spray header 11, and the water droplet does not fall downward.

Further, since the spray nozzles 10 can be dispersed and arranged in a wide space by the extension pipe 12, it is possible to spray in a wide space with a small number of water distribution pipes 4.
Further, since the extension pipe 12 and the spray nozzle 10 are attached to the spray header 11 in advance in the factory and the spray head 3 is connected to the sub-distribution pipe 4 at the site, the work at the site can be simplified.

  Although the extension pipe 12 has the same length and the same curvature, the example has been described. For example, the extension pipe 12 having a long length is made small and the extension pipe 12 having a short length is made a large curve. It may be. If it does in this way, mist can be sprayed more uniformly. Thus, even if the length of the extension pipe 12 and the degree of bending are different, the spray angle from the spray nozzle 10 and the center of the spray nozzle 10 are such that the spray region is below the horizontal plane including the lower surface of the spray header 11. By adjusting the angle θ of the shaft from the horizontal plane, it is possible to prevent mist from condensing on the spray head 3 and dripping water droplets.

  Further, when the extension pipe 12 can be lengthened, the angle θ from the horizontal plane of the central axis of the spray nozzle 10 is reduced, and when the extension pipe 12 cannot be lengthened, the angle from the horizontal plane of the central axis of the spray nozzle 10 is increased. The angle θ may be increased. That is, in the case of the extension pipe 12 having a long length, for example, 25 cm, by dropping the angle θ from the horizontal plane of the central axis of the spray nozzle 10 by 30 °, the drop of the liquid drop is not seen, and the length of the extension pipe 12 When the length is 15 cm, the drop of droplets cannot be seen by tilting the angle θ of the central axis of the spray nozzle 10 from the horizontal plane by 40 °.

  Further, the extension pipe 12 is bent and the central axis of the spray nozzle 10 is tilted downward from the horizontal plane including the lower surface of the spray header 11, and the relationship between the tilt angle θ and the spray angle of the spray region will be described. In the present invention, when the jet angle is at least half of the jet angle, for example, 60 °, 70 °, 80 °, the extension pipe 12 is bent so that the angle θ from the horizontal plane is inclined by 30 °, 35 °, 40 ° or more. To do. However, when the column 2 is vertically arranged from the ground, and the child water distribution pipe 4 is disposed along the column 2, the outer edge of the spray enters the column 2 side more than the vertical, so that the mist is 2 hits. Therefore, when the column 2 and the sub-distribution pipe 4 are below the spray header 11, it is necessary to prevent the spray outer edge from approaching the column side more than the vertical.

It is a block diagram of the spray system for temperature fall concerning Embodiment 1 of this invention. It is a partial cross section figure of the spray head of this invention. It is sectional drawing of this spray head. It is sectional drawing along the central axis of the spray nozzle. It is a figure which shows the measurement result of the particle size distribution of the sprayed mist. It is a figure showing a mode that mist is sprayed from a spray nozzle. 1 is a configuration diagram of a pressurized water supply device according to Embodiment 1. FIG. FIG. 3 is a functional block diagram of a mist control panel according to the first embodiment. 3 is a timing chart of mist spraying controlled by the pressurized water supply apparatus according to the first embodiment. It is a figure which shows the mode of the change of the water pressure added to a spray nozzle when spraying is started. It is a figure which shows the mode of the change of the water pressure added to a spray nozzle when ending spraying. It is a wet air diagram in which the value for determining the amount of spraying was entered. It is a moist air diagram in which the value for determining the amount of spraying was filled in under other conditions. It is an experimental result regarding a cooling effect and human wetting when the Sauter average particle diameter is adjusted to 10 μm or more and 22 μm or less, and the 90% cumulative volume particle diameter of mist is adjusted to less than 80 μm. It is an experimental result regarding the cooling effect and human wetting when the Sauter average particle diameter exceeds 15 μm, is adjusted to 27 μm or less, and the 90% cumulative volume particle diameter of mist is adjusted to 80 μm or more and less than 100 μm. It is an experimental result regarding the cooling effect and human wetting when the Sauter average particle size exceeds 20 μm and is 30 μm or less, and the 90% cumulative volume particle size of mist is 100 μm or more and less than 120 μm.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Spraying system for temperature drop, 2 pillars, 3 spraying heads, 4 child distribution pipes, 5 pressurized water supply device, 6 thermo-hygrometer, 7 water supply, 10 spray nozzles, 11 spray header, 12 extension piping, 14 pressure transducer, 15 cavity , 16, 17 hole, 18 straight pipe, 19 housing, 20, 21 cavity, 21a opening, 22 pressure sensitive check valve, 23 rib, 23a hole, 24 valve housing cavity, 25 pieces, 26, 27 cavity, 28 jet generation Cavity, 29 Orifice, 30 Blocking ball, 31 Spring, 32 Groove, 34 Spray area, 35 Spray angle, 36 Spray outer edge, 40 High pressure pump, 41 Main valve, 42 Main water pipe, 43 Drain valve, 44 Select valve, 45 Mist Control panel, 46 Drain piping, 47 Blade hose, 50 Spray judgment means, 51 Water supply amount control means, 52 Spray sequence control means, 53 Air diagram data Base.

Claims (4)

In a spraying system for lowering the temperature of the target space by spraying water as a mist,
The spraying system for temperature-falling characterized by the installation height of the spray nozzle which sprays water as mist, and the spray amount of mist being set based on the Sauter average particle diameter of the mist sprayed from the said spray nozzle. When the Sauter average particle size is 10 μm or more and 22 μm or less, the installation height of the spray nozzle is 3.5 m or more and 6 m or less, and the spray amount is 3 cm ³ / m ² · min or more, 20 cm ³ / m ² · The spray system for temperature drop according to claim 1, wherein the spray system is set to be equal to or less than min. When the Sauter average particle diameter exceeds 15 μm and is 27 μm or less, the installation height of the spray nozzle is 6 m or more and 10 m or less, and the spray amount is 3 cm ³ / m ² · min or more and 40 cm ³ / m ² · min. The temperature lowering spray system according to claim 1, which is set as follows. When the Sauter average particle size exceeds 20 μm and is 30 μm or less, the installation height of the spray nozzle is 10 m or more and less than 16 m, and the spray amount is 6 cm ³ / m ² · min or more, 80 cm ³ / m ² · min. The temperature lowering spray system according to claim 1, which is set as follows.

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