JP3330845B2 - cooling tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling water flowing from the top to the bottom, exchanging heat with the outside air while flowing to radiate the cooling water, and partially evaporating the cooling water while flowing. The present invention relates to a cooling tower that cools cooling water by removing heat of vaporization from a cooling tower.

[0002]

2. Description of the Related Art As means for cooling cooling water by air, the above-mentioned evaporative cooling tower is known. This type of cooling tower includes a water sprinkler for spraying water, a radiator plate through which water sprinkled from the water sprinkler is transmitted, and a water tank for receiving water drops dropped from the lower end of the radiator plate.

[0003]

When the heat sink is made of a lightweight and inexpensive vinyl chloride resin, the new heat sink repels water. For this reason, in the cooling tower immediately after installation, the range of the water dropped on the radiator plate is narrowed, the area where the water is exposed and heat exchange is reduced, and the cooling efficiency of the cooling water is poor. In addition, as the cooling tower is used, calcium contained in the water transmitted through the heat sink adheres to the surface of the heat sink, so that the wettability of the heat sink is improved, and the range of water in which the heat sink is dropped increases. In addition, the area in which water is exposed and heat exchange is increased, and the cooling efficiency is improved. That is, the radiator plate repels water only at the initial stage of the installation of the cooling tower, so that the cooling efficiency of the cooling water is poor.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cooling tower having good wettability of a heat sink and good cooling water cooling efficiency from the initial stage of installing the cooling tower. is there.

[0005]

The cooling tower of the present invention employs the following technical means to achieve the above object.
The cooling tower is provided with a water sprinkler for sprinkling water, a plurality of heat sinks for transmitting the water sprinkled from the water sprinkler through the surface, and a water tank for receiving the water transmitted through the plurality of heat sinks, wherein the plurality of heat radiating plate is formed by resin, hydroxyl
It is characterized by being assembled after being immersed in an aqueous solution of calcium chloride.

[0006]

The heat radiation plate formed of resin is immersed in an aqueous solution of calcium hydroxide before assembly. Therefore, the calcium hydroxide adhering to the surface of the heat sink
When the aqueous solution of water is dried, calcium adheres to the surface of the heat sink, and the wettability of the heat sink is improved. For this reason, even if the heat sink is molded of resin, the range of water dripping from the heat sink becomes large due to the high wettability of the heat sink from the initial stage of use, the heat exchange area where water is exposed increases, and the cooling water Good cooling efficiency.

[0007]

Next, embodiments of the present invention will be described with reference to examples. [Configuration of Embodiment] In this embodiment, the cooling tower of the present invention is applied to an absorption type air conditioner. First, the configuration of the absorption type air conditioner will be described with reference to the schematic configuration diagram of FIG.

The absorption type air conditioner 1 shown in this embodiment is a relatively small one used for home use or the like, and has heating means 2 for heating an absorption liquid (for example, lithium bromide aqueous solution);
A heavy-effect absorption refrigeration cycle 3; an indoor unit 4 for air-conditioning the room with cold / hot water (water for cooling and heating the room) cooled or heated by the absorption refrigeration cycle 3; A cooling tower 5 for cooling cooling water used for cooling a vaporized refrigerant (water vapor when an aqueous solution of lithium bromide is used as an absorbing liquid), and a control device 6 for controlling mounted electric functional components. Consists of

In the absorption refrigeration cycle 3, the low concentration absorbent (hereinafter, low liquid) is heated by the heating means 2 to vaporize (evaporate) the refrigerant (water) contained in the low concentration liquid so that the medium concentration absorbent is evaporated. (Hereinafter referred to as “medium liquid”), and the medium liquid supplied from the high temperature regenerator 7 using a pressure difference is heated by utilizing the condensation heat of the vaporized refrigerant in the high temperature regenerator 7. Then, a low-temperature regenerator 8 and a high-temperature regenerator 7 that vaporize a refrigerant contained in the middle liquid to turn the middle liquid into a high-concentration absorbing liquid (hereinafter, referred to as a high liquid)
And a condenser 9 for cooling and liquefying the vaporized refrigerant (steam) from the low-temperature regenerator 8 and an evaporator 10 for evaporating the liquefied refrigerant (water) liquefied by the condenser 9 under a pressure close to vacuum.
And the low-temperature regenerator 8
And an absorber 11 for absorbing the high liquid obtained in the above.

Further, in addition to the cooling operation by the above-described operation, the absorption refrigeration cycle 3 of the present embodiment uses the evaporator 10 to carry out the heating operation in order to perform the heating operation. And a cooling / heating switching valve 13 that opens and closes the heating pipe 12. The cooling / heating switching valve 13 is opened during the heating operation to guide the high-temperature absorbent to the evaporator 10 and heat the cold / hot water flowing through the evaporator 10.

The indoor unit 4 is installed indoors and has an evaporator 10.
The room is cooled and heated by forcibly exchanging heat between the cold and hot water that has passed through and the room air, and the cold and hot water circuit 14 circulates the cold and hot water. The cold / hot water circuit 14 is provided with a cistern 15 for storing the circulating cold / hot water, serving as an expansion tank during heating, and refilling the cold / hot water in the cold / hot water circuit 14.

A water supply pipe 16 for supplying cold and hot water (tap water) is connected to the cistern 15. The water supply pipe 16 is provided with a water supply valve 17 for supplying and stopping cold and hot water into the cistern 15. The cistern 15 includes a sensor electrode (not shown),
When the water level of the cooling water in the inside decreases, the water supply valve 17 is opened to replenish the cistern 15 with cold and hot water. Further, the cistern 15 is provided with overflow water supply means 18 for guiding the overflowed cold / hot water as cooling water into the cooling tower 5.

The cooling tower 5 circulates, through a cooling water circuit 19, cooling water whose temperature has passed through the absorber 11 and the condenser 9, and as shown in FIG. Along with the refrigeration cycle 3, it is installed outdoors as an outdoor unit. The cooling tower 5 causes the cooling water that has passed through the absorber 11 and the condenser 9 to flow downward from above, exchanges heat with the outside air while flowing, and radiates heat, and partially evaporates while flowing. The cooling water is cooled by removing heat of vaporization from the cooling water, and as shown in FIG. 1, a water sprayer 20 for spraying the cooling water downward from above and a water sprayed from the water sprayer 20 are separated. A plurality of heat sinks 21 that are transmitted down the surface and dropped
And a water tank 2 for receiving water transmitted through the plurality of heat sinks 21
2 is provided. The cooling tower 5 includes a plurality of heat sinks 2.
1 is provided with a cooling fan 23 for promoting heat radiation and evaporation of the cooling water transmitted on the surface of the cooling water.

As shown in FIG. 2, the sprinkler 20 has a plurality of sprinkling pipes 24 for spraying the cooling water supplied from the cooling water circuit 19 downward, and a cooling water sprinkled from the plurality of sprinkling pipes 24. And a plurality of diffusion plates 25 for dispersing water in a wide range. The watering pipe 24 is provided with a plurality of watering ports 2 at the bottom.
The cooling water sprinkled from the sprinkling port 24a flows to the top of the diffusion plate 25 disposed below.

As shown in FIGS. 1 and 2, the diffusion plate 25 is mounted on a plurality of heat radiating plates 21 and has a semi-cylindrical cross section along the longitudinal direction of the water sprinkling pipe 24. Immediately below the top of the diffusion plate 25, a hanging flat restricting portion 25 is provided.
a. The cooling water supplied from the water spout 24 a to the top of the diffusion plate 25 is split at the top of the diffusion plate 25 and is transmitted from the lower end of the diffusion plate 25 to the upper end of the radiator plate 21. Also,
A plurality of grooves 25b into which the upper ends of the heat radiating plates 21 are inserted are provided at predetermined intervals (for example, 1 cm) in the regulating portion 25a, and the upper sides of the plurality of heat radiating plates 21 are provided at predetermined intervals.

Further, each radiator plate 21 of this embodiment has
As shown in FIG.
Are provided so that the projections 21a are joined to each other in a stacked state and the stacking interval is kept at a predetermined interval (for example, 1 cm).

Further, as shown in FIG. 2, each heat radiating plate 21 of the present embodiment is provided in a shape which is alternately bent at small intervals. This bend is provided at an angle, and a continuous projection 21b is provided at the top of the bend.
The cooling water flowing on the surface of the heat radiating plate 21 is provided so as to flow in an oblique direction. Further, as shown in FIGS. 1 and 2, the inclination is zigzag in the vertical direction.
The flow rate of the cooling water flowing down from the upper end of the heat radiating plate 21 is moderated, and the flow path of the cooling water is lengthened to improve the heat radiation and evaporation efficiency of the cooling water. In addition, the inclination of both ends of each heat radiating plate 21 is provided so as to be lowered inward to prevent cooling water from falling from both ends of each heat radiating plate 21.

The water tank 22 serves as a tank for collecting water transmitted through the plurality of heat radiating plates 21 and for storing cooling water circulating in the cooling water circuit 19, and the water stored in the water tank 22 is cooled. The water is sent to the absorber 11 and the condenser 9 via the water circuit 19. The water tank 22 is provided with a low level sensor 22a for detecting at least the lowest water level. When the low level sensor 22a detects the lowest water level B, the control device 6 opens the water supply valve 17 and the high level sensor 22b outputs the highest water level. Systan 15 until C is detected
A replenishing operation of cooling water for guiding water overflowing from the cooling tower 5 is performed.

Each heat radiating plate 21 is formed of an inexpensive and lightweight vinyl chloride resin (an example of resin), and this material is easy to repel water immediately after molding. Before the heat sink 21 is assembled to the cooling tower 5, a concentrated calcium hydroxide aqueous solution is used.
After being immersed in the liquid and dried, calcium is intentionally adhered to the surface of the radiator plate 21 to improve the wettability of the radiator plate 21 immediately after the completion of the installation of the cooling tower 5.
When the cooling tower 5 is operated for a predetermined period (for example, 7 to 10 days), components (such as calcium) contained in water adhere to the surface of the radiator plate 21 and the wettability is improved. It is sufficient that the calcium hydroxide to be attached before is attached at least for the above-mentioned predetermined period.

[Effects of Embodiment] As described above, each radiator plate 21 is made of inexpensive vinyl chloride resin, but is immersed in an aqueous solution of calcium hydroxide before assembling so that calcium adheres to the surface. The cooling tower 5
Immediately after the completion of assembling, the wettability of the heat sink 21 can be ensured. Therefore, immediately after the cooling tower 5 is installed and used, the radiator plate 21 exhibits high wettability. As a result, the cooling water dripping on the radiator plate 21 spreads over a wide area from the beginning of use,
The surface area of the heat exchanged water is increased, and the cooling efficiency of the cooling water is good.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cooling tower.

FIG. 2 is a perspective view of a main part of a sprinkler and a heat sink.

FIG. 3 is a perspective view of the outdoor unit.

FIG. 4 is a schematic diagram of an absorption type air conditioner.

[Explanation of symbols]

 5 Cooling tower 20 Sprinkler 21 Heat sink 22 Water tank

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasunari Furukawa 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Examiner, Osaka Gas Co., Ltd. Shinpei Yamamoto (56) References JP-A-62-87797 (JP, A) JP-A-6-145537 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28F 25/08

Claims (1)

(57) [Claims] 1. A water sprinkler for spraying water, a plurality of heat sinks for dropping the water sprinkled from the water sprinkler through the surface thereof, and a water tank for receiving the water transmitted through the plurality of heat sinks. in cooling tower comprising, a plurality of heat radiating plate is formed by resin, mosquitoes hydroxide
A cooling tower which is assembled after being immersed in an aqueous solution of lucium.