JPH0571883A - Cooling tower - Google Patents

Abstract

PURPOSE:To obtain a cooling tower having a new refrigerant circulation passage which is capable of preventing dust in the air from being contaminated into a refrigerant solution and reducing production cost with simple structure. CONSTITUTION:A cooling tower is provided with a distribution passage which distributes air in a housing 10 and a circulation passage 20 of refrigerant liquid which circulates by way of the air distribution passage as well. The circulation passage 20 or at least its circulation portion located in the air distribution passage is adapted to comprise a piping member 21 made of a fine porous material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling tower used for air conditioning, and more particularly to a cooling tower having a novel refrigerant circulation path.

[0002]

2. Description of the Related Art In recent years, water shortages in large cities have become a serious problem due to the rapid population increase in cities and the increase in various water consumption per capita. For this reason, various researches on water saving have been conducted.

In particular, the saving of air conditioning water used in various air conditioning facilities has become an important issue.

The above-mentioned water for air conditioning is used in a large amount in a water-cooling type cooling tower for releasing the generated heat recovered by the refrigerator, and the ratio of the cooling tower make-up water quantity to the building water supply quantity is Significantly increased, reaching 25% or more. In recent years, shortage of water resources has become a problem, and the possibility of saving the amount of supplementary water is becoming more and more important, which is one of the themes of water conservation measures in the suburbs of large cities.

The above water cooling type cooling tower is shown in FIGS.
There is a format shown in. FIG. 6 shows an open type cooling tower, in which refrigerant water is made to flow down into a packing layer to be partially evaporated by direct contact with air, and the heat of vaporization is used for cooling. On the other hand, what is shown in FIG. 7 is a closed cooling tower, which is a system in which refrigerant water is passed through a closed tube to cool it, and a heat transfer tube is installed in an appropriate forced ventilation tower. Cooling water is made to flow down to be evaporated, and the heat of evaporation cools the warm water.

[0006]

The various cooling towers described above have the following problems.

In the open type cooling tower, the circulating refrigerant water is sprayed into the tower and directly contacted with the outside air for cooling. Therefore, dust in the air is inevitably mixed, and these dusts cause the cooling water system piping That is, there was a risk of causing.

In the closed cooling tower, since the refrigerant water circulates in the closed pipe, there is no mixing of dust as described above, but two lines of the refrigerant water system and the cooling water system are required. However, the structure was complicated and there was an obstacle to cost reduction.

Further, in these cooling towers, it is necessary to provide a drain pan and a drain line for receiving the water flowing down after the spraying, and it is inevitable that the size of the machine becomes large. The moss and the like grew, which sometimes led to a decrease in cooling efficiency and an offensive odor.

Therefore, the inventors of the present invention have noticed that in order to solve the above-mentioned problem, cooling by evaporation and circulation of refrigerant water can be performed by one substantially closed piping system,
We have come up with a cooling tower with a new refrigerant circulation path.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, in which air is circulated in a housing and a circulation path for a refrigerant liquid passing through the air circulation path is provided. In the cooling tower, at least a circulating portion of the circulation path located in the air circulation path is a piping member made of a fine porous material.

[0012]

1 and 2 show an embodiment of a cooling tower according to the present invention. In the figure, (10) is a cooling tower housing, (20) is a cooling medium circulation path, and (30) is a cooling tower controller.

A forced ventilation fan (F) is attached to the upper portion of the cooling tower housing (10), and external air is taken in from an air introduction hole (12) provided in the lower portion of the housing by the forced ventilation fan (F). After flowing through the housing (10), it is discharged from the upper opening (13).

The circulation path (20) is for circulating refrigerant water between an external load (not shown) such as an air conditioner or a refrigerator and this cooling tower. In this circulation path (20), the circulation portion located inside the cooling tower housing (10), that is, the piping member (21), has a fine porous shape, and the refrigerant water flowing inside is the piping member (21). It can be exuded appropriately on the outer surface. In this embodiment, the piping member
The shape of (21) is spiral, and a porous material is obtained from a sintered metal material. The above-mentioned piping member does not have to be a general spiral ring, and may have a curtain shape or a coil shape as shown in FIG. 3 and FIG. 4, and its material is not only a sintered material but also a resin-based material. Functional materials (selective permeable membrane),
As shown in FIG. 5, a composite material may be used in which a punching metal (21a) is used for the outer skin (outer shape holding member) and a permeable member (21b) such as cloth is arranged inside.

A circulation path (2) upstream of the piping member (21)
A pump (P) for supplying the coolant water from the external load to the cooling tower is connected to (0), and the pump (P) in the coolant water is provided on the downstream side to prevent corrosion of the external load side pipe. A deaerator (40) for removing dissolved air (particularly dissolved oxygen) is connected.

Further, a bypass pipe (22) in parallel with the pipe member (21) is connected between the downstream side of the pump (P) and the upstream side of the deaerator (40), A flow control valve (23) is connected to the bypass pipe (22).

The control device (30) is for adjusting the load in the cooling tower and the amount of exudation from the piping member (21) according to the operating condition. Based on the detection signals from the temperature sensor (31) attached to the outlet side of the pipe member (21) and the pressure sensor (32) attached to the inlet side of the pipe member (21), the pump (P), the forced draft fan (F) ), And controls the flow control valve (23).

The function of the embodiment of the present invention will be described below. First, the pump (P) supplies the coolant water from the external load to the cooling tower through the circulation path. Then, the cooling water flows through the above-mentioned pipe and is then sent toward the external load again.

A piping member (2) in the cooling tower housing (10)
In 1), the coolant water flowing inside permeates the surface and oozes out. Since this amount changes depending on the pressure in the circulation path as described later, it is adjusted so that the permeation amount becomes an appropriate value depending on the discharge amount (or discharge pressure) of the pump (P).

The refrigerant water oozing out from the surface of the pipe is evaporated from the surface of the pipe, and the latent heat of vaporization at this time releases the heat from the surface of the pipe. Therefore, the cooling water discharged from this piping member (21) has dropped by a predetermined temperature, and in this state, the circulation path
It is supplied to the external load via (20).

Further, since the piping member (21) has a fine porous shape as described above and pressure is constantly applied from the inside to the outside, the inside of the piping member (21) passes through these fine holes. No dust is mixed in.

The cooling tower is controlled as follows. First, the discharge amount of the pump (P) is controlled by detecting the refrigerant water pressure at the outlet of the piping member (21). Also,
The discharge amount of the pump (P) and the blown amount of the forced ventilation fan (F) are controlled by detecting the temperature of the coolant water at the outlet of the piping member (21).

Specifically, if the temperature of the coolant water is high,
By increasing the discharge amount of the pump (P) and the air flow amount by the forced draft fan (F) to increase the evaporation amount from the surface of the piping member (21), the refrigerant water is further cooled, and the refrigerant water temperature is increased. If the value is low, the discharge amount of the pump (P) is reduced and the amount of air blown by the forced draft fan (F) is reduced to reduce the amount of evaporation from the surface of the piping member (21), thereby supercooling the refrigerant water. At the same time, the flow control valve (23) in the bypass pipe (22) is adjusted to allow the excess refrigerant water to flow back to the external load without flowing through the pipe member (21).

[0024]

According to the cooling tower of the present invention, since the cooling water is cooled only by the piping of the cooling water circulated with the external load, the structure is simple and the size can be reduced. , You can get a low cost cooling tower. Moreover, according to the cooling tower of the present invention, since the coolant water substantially flows through the closed pipe, it is possible to guarantee stable performance over a long period without the inclusion of dust as described above. it can.

Further, since the portion for actually exchanging heat does not require a filler layer as in the conventional case, and the heat exchanging section has no heat transfer plate such as fins, it is simply a porous pipe, so that exchanging is not necessary. For example, it is easy to use and has a great advantage when used.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a cooling tower according to the present invention.

FIG. 2 is an enlarged view of a main part of the cooling tower according to the present invention.

FIG. 3 is a perspective view of a main part showing still another embodiment of the cooling tower according to the present invention.

FIG. 4 is a perspective view of a main part showing still another embodiment of the cooling tower according to the present invention.

FIG. 5 is an enlarged view of a main part showing still another embodiment of the cooling tower according to the present invention.

FIG. 6 is a schematic side view showing an example of a conventional open type cooling tower.

FIG. 7 is a schematic side view showing another example of a conventional closed cooling tower.

[Explanation of symbols]

 (10)… Cooling tower housing (12)… Air introduction hole (13)… Upper opening (20)… Coolant circulation path (21)… Piping member (22)… Bypass piping (23)… Flow control valve (30 ) Control device (31) Temperature sensor (32) Pressure sensor (40) Degassing device (F) Forced ventilation fan (P) Pump

Claims (1)

[Claims] 1. A cooling tower comprising a housing (10) having a circulation path for circulating air and a refrigerant liquid circulation path (20) passing through the air circulation path. A cooling tower, characterized in that at least a circulating portion located in the air circulation path is a piping member (21) made of a fine porous material.