JPH03125881A - Water cooling device - Google Patents

Abstract

PURPOSE:To permit efficient cooling of water by a method wherein an evaporating unit, having a space for evaporating water, is provided in the way of a water passage, through which the water flows, while a space in the evaporating unit is evacuated by a vacuum pump. CONSTITUTION:Water flows through a pipeline 10 from left to right, for example, while a porous tube 11, made of a porous material, is constituted so that water is exuded from inside to the outer surface of the same. An evaporating unit 19 is constituted of the porous tube 11 and a vacuum vessel 13, covering the porous tube 11 through a space 18. When the vacuum pump 14 is driven to evacuate the vacuum vessel 13, the evaporation of water from the surface of the porous tube 11 is promoted. In this case, the vapor pressure of water and ice at a temperature of 0 deg.C is approximately 4.5Torr and, therefore, boiling of water is generated when the degree of vacuum becomes higher than said value whereby the evaporation of water is increased remarkably. The temperature reduction of water is determined by the evaporating amount of the water and, therefore, a control system 17 is provided to control the vacuum pump 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water chiller that uses a vacuum pump to cool water flowing through a waterway such as a pipe.

[Conventional technology]

FIG. 5 is a partially cutaway front view of a conventional water chiller. In the figure, 1 is the water inlet of the pipe (T), 2
is the population valve connected to the vicinity of this population 1, 3 is the cooling container installed in the middle of the pipe (T), 4 is the outlet valve connected to the vicinity of the water outlet 5 of the pipe (T), 6 is the cooling container mentioned above 3
A heat exchanger for water cooling installed and wrapped around the inside of the pipe (T) and the outer circumference of the pipe (T) serving as a waterway, 7 a compressor for compressing a refrigerant such as fluorocarbon gas, 8 a refrigerant pipe,
9 is a heat exchanger for dissipating the heat of the adiabatic compressed refrigerant to the outside, and is connected to the heat exchanger 6 and compressor 7.
The heat exchanger 9 and the heat exchanger 9 are connected as shown in the figure via piping 8 to constitute a refrigeration cycle.

Next, the operation will be explained. First, the compressor 7 constituting the refrigeration cycle described above adiabatically compresses the refrigerant sent from the cooling heat exchanger 6, and the heat generated by the adiabatic compression is radiated to the atmosphere etc. by the heat exchanger 9. . Subsequently, when this heat-radiated refrigerant is allowed to freely expand within the pipe 8, the temperature of this refrigerant is lowered than before the compression operation. Therefore, by passing this cooled refrigerant through the heat exchanger 6 provided in the cooling container 3 and the outer periphery of the pipe 8 as described above, the water inside these can be cooled. When taking out the cold water cooled in this way to the outside, the outlet valve 4 is opened. on the other hand,
If the water in the cooling container 3 decreases due to this opening,
The inlet valve 2 is opened automatically or manually to supply fresh water from the outside into the cooling vessel 3.

[Problem to be solved by the invention]

Conventional chilled water devices are configured as described above, so they must use a complicated and expensive refrigeration cycle system as a means of chilling water.Furthermore, they generally use fluorocarbons as a refrigerant, which causes environmental pollution. There were issues such as inviting

This invention was made in order to solve the above-mentioned problems, and aims to provide a chilled water device that can be constructed simply and inexpensively, and can avoid environmental pollution.

[Means to solve the problem]

In the water cooling device according to the present invention, in the middle of a waterway through which water flows,
An evaporation section having a space for evaporating the water is provided, and the pressure inside the space of the evaporation section is reduced using a vacuum pump.

[Function] The vacuum pump of the present invention draws the inside of the evaporator space under low pressure, thereby promoting the evaporation of water vapor from the water surface in contact with the space, and this evaporation removes the heat of the water facing the space. This acts to efficiently cool this water.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, numeral 10 indicates a plurality of pipes serving as water channels, which are connected to each other at flanges 12 at both ends. Water flows through the pipe 10 from left to right, for example. , 11 is a porous tube made of a porous material, and is configured so that water oozes out from the inside to the outside surface. 13 connects this porous tube 11 to the space 18
This porous tube 11 and vacuum vessel 13 constitute an evaporation section 19.

14 is a vacuum pump that draws the inside of this vacuum container 13 to a reduced pressure; 15 is a vacuum gauge that monitors the degree of vacuum; 16 is a thermometer that monitors the temperature of water at the outlet and inlet of piping IO;
7 is a control system that controls this evaporation system based on data obtained from a vacuum gauge 15 and a thermometer 16; specifically, it outputs a signal to control a vacuum pump in order to control the temperature of water. do.

Next, the operation will be explained. First, the vacuum pump 14 is driven to reduce the pressure inside the vacuum container 13. Therefore, evaporation of water from the surface of the porous tube 11 is promoted.

Here, the vapor pressure of water at 0°C and ice at 0°C is approximately 4.5
torr, so if the vacuum is higher than this value, boiling of water will occur, which will significantly increase water evaporation. The amount of evaporation is determined by the material of the porous tube 11, its structure, and the degree of vacuum, while the amount of heat reduced by cooling is determined by the capacity of the vacuum pump 14. Therefore, - As an example, if we consider lowering the temperature of water from 30°C to 10°C, that is, to 20°C, the flow rate of water is lj! at the outlet! /s, it is necessary to remove E amount of heat per unit time. This heat ME is E=(30℃-10℃) x 1000g/s=2.0
X IO'caJ/s --(1)
becomes.

On the other hand, the heat of vaporization of water at 25°C is approximately 580 cal/g.
Therefore, it is necessary to convert W water into steam per unit time. The amount W of water, that is, the amount of water vapor evaporated to remove the amount of heat E, is =34.5 g/s (2).

This is 34.5g / 18g = 1.92 + go
+ corresponds to water, 1.92 x 22.4 in standard condition
= 42.9:M! corresponds to water vapor.

Also, the vapor pressure at 10''C is approximately 9.2 torr, or the pumping speed of the vacuum pump 14 is required to be V=35461!/s-(3).

On the other hand, the energy per unit time required for cooling in this way is: = Sp-dv 10' (Newton)
4.3 J/s -4,4KW ・・・・・・・・・
(4) This increases the efficiency of the motor and vacuum pump 14 by 100
This is the value when converted to %, and in reality, an output 2 to 4 times this value is required.

As mentioned above, the temperature of water is determined by the amount of evaporation of water, so the control system 17 monitors the degree of vacuum and temperature as described above and controls the vacuum pump 14 accordingly.
Is required.

FIG. 2 shows another embodiment of the present invention, in which a water storage container 21 having a space 1B as an evaporation section 19 is provided in the middle of a pipe (T) as shown in FIG.
A vacuum pump 14 is connected above the vacuum pump 14 to promote evaporation of the water contained inside. 22 is a thermometer that detects the temperature of the water in the water storage container 21, and the detection signal from this thermometer 22 is manually input to the control system 17 together with the detection signal from the vacuum gauge 15. 23 is a water pump connected in the middle of the outlet side piping (T).

In this embodiment, the water storage container 21 is
By drawing the inside to a low pressure, water is evaporated from the surface of the water contained inside, and by sufficiently promoting this evaporation, water can be efficiently cooled by evaporation similar to the above.

Moreover, when taking out the cooled water from the water storage container 21,
The outlet valve 4 is opened, but since the pressure inside the water storage container 21 is low as described above, by driving the water pump 23, the cooled water is forcibly discharged continuously or intermittently as described above. can do. If necessary, if the vacuum pump 14 is stopped and atmospheric pressure is introduced into the air nr 11B, the cooled water can be continuously or intermittently discharged to the outside without using the water pump 23. Can be done.

In the above embodiment, the porous tube 11 for evaporating water vapor has a straight tube structure, but as shown in FIG. As shown in the figure, a structure may be adopted in which a porous tube 11B branched into a plurality of tubes is integrated at both ends, thereby expanding the evaporation area of water vapor and promoting better evaporation and cooling. .

〔Effect of the invention〕

As described above, according to the present invention, an evaporation section having a space for evaporating the water is provided in the middle of a water channel through which water flows, and the inside of the space is drawn to low pressure using a vacuum pump. It is possible to promote the evaporation of water vapor from the water surface in contact with the space, and by removing the heat from the water through this evaporation, this water can be efficiently cooled, and the water can be cooled with a simple and inexpensive structure. There is an effect that can be achieved by.

[Brief explanation of the drawing]

FIG. 1 is a partially cut-away front view of a water chiller according to one embodiment of the present invention, FIG. 2 is a partially cut-away front view of another embodiment of the chiller of the present invention, and FIG. 4 is a front view showing another embodiment of the porous tube shown in FIG. 1, and FIG. 5 is a schematic configuration diagram showing a conventional chilled water device. 10 is a water channel, 14 is a vacuum pump, 18 is a space, and 19 is an evaporation section. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Representative Masuo Daiiwa No. 1 9 10: Waterway 14: Vacuum Ho 6 Fa 18: 9 Back 19: Shobu No.

Claims (1)

[Claims] A chilled water device comprising: an evaporator section that is provided in the middle of a water channel through which water flows and has a space for evaporating the water; and a vacuum pump that reduces the pressure in the space of the evaporator section.