KR102267893B1 - Cooling device using membrane and cooling method using same - Google Patents

Abstract

The present invention relates to a cooling apparatus using a membrane and a cooling method using the same. In accordance with an embodiment of the present invention, provided is a technology to configure a cooling apparatus by using an ejector, and make it easy to operate the cooling apparatus. In accordance with an embodiment of the present invention, the cooling apparatus using the membrane comprises: a steam generation unit which generates high-pressure steam which is water steam with a temperature and pressure increased by heating; an evaporation unit which evaporates water to cool by latent heat; an ejector unit in which one part is engaged with the steam generation unit and the other part is engaged with the evaporation unit to provide a flow path to the high-pressure steam, cause a decrease in the pressure by flow of the high-pressure steam and vacuum-evaporate the water of the evaporation unit; the membrane which makes moisture discharged from the ejector unit penetrate; and a discharge flow path unit engaged with the ejector unit and the membrane to provide the flow path to the moisture flowing from the ejector unit to the membrane.

Description

A cooling device using a membrane and a cooling method using the same {COOLING DEVICE USING MEMBRANE AND COOLING METHOD USING SAME}

The present invention relates to a cooling device using a membrane and a cooling method using the same, and more particularly, to a technology for constructing a cooling device using an ejector and facilitating the operation of the cooling device.

Recently, due to the development of various materials and material technologies, various technologies that can replace the vapor compression cycle have been proposed, and research and development of technologies that perform cooling without using a compressor and a refrigerant in principle are actively promoted. have.

The ejector included in the refrigeration cycle improves the coefficient of performance (COP) of the cycle, and the ejector is a simple and robust part without a separate driving device, and has the advantage of low production cost and fewer failures. Such an ejector uses Bernoulli's principle to increase the velocity energy of the fluid, and within the refrigeration cycle, the ejector performs a refrigerant decompression function, such as an expansion valve, or uses the kinetic energy of the refrigerant to suck the refrigerant vapor to increase the pressure. It can perform a pressurization function.

In addition, the use of membranes for heat pumps is increasing, and research and development on technologies for increasing the efficiency of refrigeration cycles or heat pump cycles by performing dehumidification while passing moisture using a hydrophobic membrane among the membranes are increasing. .

In Korean Patent Registration No. 10-1838636 (title of invention: ejector and refrigeration cycle device having the same), an accommodation space is provided therein, and an inlet through which high-pressure refrigerant and low-pressure refrigerant are introduced into the accommodation space and the high-pressure refrigerant and an ejector body having a mixing unit in which a low-pressure refrigerant is mixed; A nozzle positioned inside the ejector body having a nozzle neck formed to inject the high-pressure refrigerant at high speed, and an expansion unit formed to gradually increase an inner diameter from the nozzle neck to expand the refrigerant that has passed through the nozzle neck ; a first needle having a tapered portion which is relatively movable inside the inflation portion to adjust the flow cross-sectional area of the inflation portion and is formed such that an outer diameter is gradually reduced; a second needle which is moved relative to the inside of the nozzle neck to adjust the flow cross-sectional area of the nozzle neck and the outer diameter is gradually reduced; a first needle driving unit for driving the first needle; and a second needle driving unit for driving the second needle independently of the first needle driving unit; and an ejector including, and a refrigeration cycle device having such an ejector.

Republic of Korea Patent No. 10-1838636

An object of the present invention for solving the above problems is to configure a cooling device using an ejector, and to facilitate the operation of the cooling device.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. There will be.

The configuration of the present invention for achieving the above object includes: a steam generator for generating high-pressure steam, which is steam having an increased temperature and pressure by heating; an evaporator for evaporating water to perform cooling by latent heat; an ejector unit having one portion coupled to the steam generator and another portion coupled to the evaporator, providing a flow path to the high-pressure steam and evaporating the water in the evaporator in a vacuum due to a pressure drop caused by the flow of the high-pressure steam; a membrane permeating the moisture discharged from the ejector unit; and a discharge passage unit coupled to the ejector unit and the membrane and providing a flow path for moisture flowing from the ejector unit to the membrane, wherein the internal pressure of the discharge flow path unit is maintained constant.

In an embodiment of the present invention, the internal pressure of the discharge passage part may be formed to be greater than a partial pressure of moisture in the external air, which is the atmosphere outside the membrane, and less than the external pressure.

In an embodiment of the present invention, the ejector unit, a high-pressure inlet pipe into which the high-pressure steam is introduced, a nozzle coupled to the high-pressure inlet pipe and high-speed jetting the high-pressure steam passing through the high-pressure inlet pipe, is coupled with the nozzle, An ejector chamber having an internal space through which the high-pressure steam injected at high speed by the nozzle passes, and a pressure drop caused by the flow of the high-pressure steam in the internal space, coupled to the ejector chamber, and the internal space of the ejector chamber A vacuum suction tube through which water evaporated in a vacuum is sucked by the suction force according to the pressure drop, and a diffuser tube that is coupled to the ejector chamber and whose inner diameter gradually decreases and then gradually increases along the flow direction of the water discharged from the ejector chamber, can be provided.

In an embodiment of the present invention, the steam generator may include a steam chamber for storing water and generating and discharging the high-pressure steam, and a steam heat source for heating water in the steam chamber.

In an embodiment of the present invention, the evaporator may include an evaporating chamber for storing water and discharging vacuum-evaporated water, and a cooling body cooled by the evaporating chamber whose temperature is lowered.

The configuration of the present invention for achieving the above object includes a first step in which the high-pressure steam is generated in the steam generating unit and supplied to the ejector unit; a second step of generating suction force by causing a pressure drop as the high-pressure steam is injected at a high speed from the inside of the ejector unit; a third step in which the water stored in the evaporator is vacuum evaporated by the suction force of the ejector unit to cool the evaporator; and a fourth step in which the moisture discharged from the ejector unit flows along the discharge passage and then passes through the membrane and is sprayed to the outside.

The effect of the present invention according to the above configuration is that by using an ejector for the cooling device, the configuration of the cooling device can be simplified and the cooling efficiency can be increased.

And, the effect of the present invention is that, since the discharge pressure of the ejector can be lowered to the partial pressure of moisture in the outside air instead of the atmospheric pressure by using the membrane, the heating temperature for generating high-pressure steam can be lowered, so that the energy efficiency can be increased. will be.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a schematic diagram of a configuration of a cooling device according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in several different forms, and thus is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be “connected (connected, contacted, coupled)” with another part, it is not only “directly connected” but also “indirectly connected” with another member interposed therebetween. "Including cases where In addition, when a part "includes" a certain component, this means that other components may be further provided without excluding other components unless otherwise stated.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a configuration of a cooling device according to an embodiment of the present invention. As shown in FIG. 1, the cooling device of the present invention includes: a steam generating unit 300 for generating high-pressure steam, which is steam whose temperature and pressure are increased by heating; an evaporator 400 for evaporating water to perform cooling by latent heat; One portion is combined with the steam generating unit 300 and the other portion is combined with the evaporator 400 , providing a flow path to the high-pressure steam and vacuuming the water in the evaporation unit 400 due to pressure drop caused by the flow of the high-pressure steam Evaporating ejector unit 100; a membrane 210 that transmits moisture discharged from the ejector unit 100; and a discharge passage unit 220 coupled to the ejector unit 100 and the membrane 210 and providing a flow path for moisture flowing from the ejector unit 100 to the membrane 210 . In each component of the cooling device of the present invention, only water in a gaseous or liquid state can flow. Here, the internal pressure of the discharge passage part 220 may be constantly maintained, and accordingly, the operation of the ejector part 100 may be constantly and stably performed.

In addition, the internal pressure of the discharge passage 220 may be greater than the partial pressure of moisture in the ambient air outside the membrane 210 and less than the external pressure. Accordingly, the pressure at the outlet end of the ejector unit 100 may be reduced to be close to the partial pressure of moisture in the outside air. Specifically, by forming the membrane 210, the pressure at the outlet end of the ejector unit 100 can be reduced to a pressure (3.5 kPa) close to the partial pressure of moisture (2.5 kPa) of the outside air, not the atmospheric pressure (101.3 kPa), Accordingly, it is possible to reduce the heating temperature for generating the high-pressure steam in the stem generating unit 300, the energy efficiency of the cooling device of the present invention can be increased. (The above-described pressures of 101.3 kPa, 2.5 kPa, and 3.5 kPa are specific examples based on dry bulb 35°C and wet bulb 24°C.)

As described above, the pressure at the outlet end of the ejector unit 100 (pressure in the discharge flow path unit 220 ) is reduced to be close to the water partial pressure of the outside air, but is formed to be larger than the water partial pressure of the outside air, so that both sides of the membrane 210 are Moisture may flow through the membrane 210 from the discharge passage 220 to the outside air due to the difference in water partial pressure. Here, as long as the membrane 210 is a membrane capable of permeating moisture, any type of membrane may be used.

As shown in FIG. 1 , one end of the discharge passage 220 may be combined with the ejector unit 100 , and the other end of the discharge passage 220 may be combined with the membrane 210 , and the length of the ejector unit 100 . When the cross-sectional area of the membrane 210 perpendicular to the direction central axis is formed to be larger than the flow passage cross-sectional area of the discharge passage, the discharge passage 220 may be formed in a shape in which the flow cross-sectional area is gradually increased. (Here, the flow cross-sectional area means the area of the cross-section perpendicular to the flow direction of the fluid. Hereinafter, the same applies.)

The ejector unit 100 includes a high-pressure inlet pipe 110 through which high-pressure steam is introduced, a nozzle 120 that is coupled to the high-pressure inlet pipe 110 and high-speed jetting high-pressure steam passing through the high-pressure inlet pipe 110, a nozzle ( The ejector chamber 130 and the ejector chamber 130 are coupled to 120 and have an internal space through which the high-pressure steam injected at high speed by the nozzle 120 passes, and a pressure drop is caused by the flow of the high-pressure steam in the internal space. ) and the vacuum suction pipe 140 through which the water evaporated in a vacuum is sucked by the suction force according to the decrease in the internal space pressure of the ejector chamber 130, and the ejector chamber 130 and coupled with the ejector chamber 130. The diffuser tube 150, which gradually increases while gradually decreasing the inner diameter along the flow direction of water, may be provided.

The high-pressure inlet pipe 110 has a tube shape, and high-pressure steam is introduced into the inlet of the high-pressure inlet pipe 110 , and the outlet of the high-pressure inlet pipe 110 may be coupled to the ejector chamber 130 . At the same time, the nozzle 120 is coupled to the outlet of the high-pressure inlet pipe 110 , and the high-pressure steam passing through the high-pressure inlet pipe 110 may be introduced into the nozzle 120 . The nozzle 120 may be formed in a conical shape in which the flow cross-sectional area is gradually reduced along the flow direction of the high-pressure steam.

The high-pressure steam injected by the nozzle 120 may be introduced into the diffuser tube 150 after passing through the inner space of the ejector chamber 130 , and as such, the high-pressure steam passes through the inner space of the ejector chamber 130 at high speed. While passing, a pressure drop may occur inside the ejector chamber 130 . And, the pressure drop occurs in the vacuum suction pipe 140 connected to the ejector chamber 130 due to this pressure drop, and accordingly, vacuum evaporation from the water stored in the evaporation chamber 410 connected to the vacuum suction pipe 140 is performed. can proceed. In addition, the temperature of the evaporation chamber 410 may be reduced by vacuum evaporation of water in the evaporation chamber 410 .

After the high-pressure steam generated by the steam generator 300 and the water evaporated from the evaporator 400 are mixed in the ejector chamber 130, they flow along the diffuser tube 150, and the mixed fluid is water vapor and water droplets. Since it may be a mixed fluid of , the fluid flowing along the diffuser tube 150 is called moisture. Here, the moisture pressure P3 at the outlet of the diffuser tube 150 may be smaller than the pressure P1 of the high-pressure steam and greater than the pressure P2 of the water evaporated in the evaporator 400 .

And, as described above, the internal pressure of the discharge channel 220 is formed to be greater than the partial pressure of moisture in the external air that is the atmosphere outside the membrane 210 and is formed to be smaller than the pressure of the external air, so the value of P3 is controlled. can do. Specifically, an internal pressure sensor 221 is formed inside the discharge passage 220 , and the internal pressure sensor 221 is a moisture pressure P3 of the outlet of the diffuser tube 150 , that is, the ejector unit 100 . It is possible to measure the water pressure (P3) at the outlet end of In addition, an external sensor 222 is formed on the outside of the discharge flow path 220, and the external sensor 222 measures the dry-bulb temperature or wet-bulb temperature of the outside air and uses this to measure the partial pressure P4 of the outside air. have.

The cooling apparatus of the present invention may further include a controller (not shown) for receiving the information on P3 and P4 described above, and controlling the heating temperature of the steam heat source 320 according to the values of P3 and P4. When the respective values of P3 and P4 are transmitted to the controller, the controller may compare the values of P3 and P4. And, when P3 is formed smaller than P4, the control unit transmits a control signal to the steam heat source 320, and accordingly, the heating temperature of the steam heat source 320 rises, and the pressure P1 of the high-pressure steam increases, P3 can be controlled to exceed P4. In addition, as described above, since the internal pressure of the discharge passage part 220 is a value significantly lower than the pressure of the outside air, the control unit controls P3 is a pressure lower than the pressure of the outside air (in a specific embodiment, 10% or less of the outside pressure, but, The steam heat source 320 may be controlled to be formed of (but not limited thereto).

The steam generator 300 may include a steam chamber 310 that stores water and generates and discharges high-pressure steam, and a steam heat source 320 that heats water in the steam chamber 310 . Here, renewable energy such as solar heat or geothermal heat may be used as the steam heat source 320 . Alternatively, district heating water or the like may be used as the steam heat source 320 .

The evaporator 400 may include an evaporating chamber 410 for storing water and discharging vacuum-evaporated water, and a cooling body 420 cooled by the evaporating chamber 410 having a lowered temperature. Water is stored in the internal space of the evaporation chamber 410 and may be coupled to a cooling heat exchanger 430 that cools the cooling body 420 by heat exchange in the evaporation chamber 410 . The refrigerant passing through the cooling heat exchanger 430 is cooled by the evaporation chamber 410 whose temperature is lowered, and the refrigerant is supplied to the cooling body 420 to perform cooling of the cooling body 420 .

Hereinafter, a cooling method using the cooling device of the present invention will be described.

First, in the first step, high-pressure steam may be generated in the steam generating unit 300 and supplied to the ejector unit 100 . And, in the second step, as high-pressure steam is injected at a high speed inside the ejector unit 100 , a pressure drop may be induced to generate suction force. Next, in the third step, the water stored in the evaporator 400 may be vacuum-evaporated by the suction force of the ejector unit 100 to perform cooling of the evaporator 400 . Thereafter, in the fourth step, the moisture discharged from the ejector unit 100 may flow along the discharge passage unit 220 and then may pass through the membrane 210 and be sprayed to the outside. The remaining details are the same as those described above.

The description of the present invention described above is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

100: ejector unit 110: high pressure inlet pipe
120: nozzle 130: ejector chamber
140: vacuum suction tube 150: diffuser tube
210: membrane 220: discharge passage part
221: internal pressure sensor 222: external pressure sensor
300: steam generator 310: steam chamber
320: steam heat source 400: evaporation unit
410: evaporation chamber 420: cooling body
430: cooling heat exchanger

Claims (6)

a steam generator for generating high-pressure steam, which is steam whose temperature and pressure are increased by heating;
an evaporator for evaporating water to perform cooling by latent heat;
an ejector unit having one portion coupled to the steam generator and another portion coupled to the evaporator, providing a flow path to the high-pressure steam and evaporating the water in the evaporator in a vacuum by causing a pressure drop by the flow of the high-pressure steam;
a membrane permeating the moisture discharged from the ejector unit; and
and a discharge passage unit having one end coupled with the ejector unit and the other end coupled with the membrane, and providing a flow path for moisture flowing from the ejector unit to the membrane; and
The internal pressure of the discharge passage part is kept constant so that the operation of the ejector part is constantly and stably performed,
The cross-sectional area of the membrane perpendicular to the longitudinal central axis of the ejector portion is formed to be larger than the flow cross-sectional area of one end of the discharge passage portion, and the discharge passage portion has a shape in which the flow cross-sectional area gradually increases from one end to the other end,
The internal pressure of the discharge passage part is formed to be greater than the moisture partial pressure of the external air, which is the atmosphere outside the membrane, and is smaller than the external air pressure, so that the pressure at the outlet end of the ejector part is reduced to be close to the moisture partial pressure of the outside air. A cooling device using a membrane, characterized in that it increases energy efficiency by reducing the heating temperature for generating high-pressure steam.
delete The method according to claim 1,
The ejector unit,
A high-pressure inlet pipe through which the high-pressure steam is introduced,
A nozzle coupled to the high-pressure inlet pipe and high-speed jetting high-pressure steam that has passed through the high-pressure inlet pipe;
An ejector chamber coupled to the nozzle and having an internal space through which the high-pressure steam sprayed at high speed by the nozzle passes, the pressure drop caused by the flow of the high-pressure steam in the internal space;
a vacuum suction tube coupled to the ejector chamber and sucked in vacuum-evaporated water by a suction force caused by a decrease in internal space pressure of the ejector chamber; and
and a diffuser tube coupled to the ejector chamber and having an inner diameter gradually decreasing and then gradually increasing along a flow direction of the water discharged from the ejector chamber.
The method according to claim 1,
The steam generator,
A steam chamber for storing water and generating and discharging the high-pressure steam, and
A cooling device using a membrane, characterized in that it comprises a steam heat source for heating the water in the steam chamber.
The method according to claim 1,
The evaporation unit,
an evaporation chamber for storing water and discharging vacuum-evaporated water, and
A cooling device using a membrane, characterized in that it comprises a cooling body cooled by the evaporation chamber, the temperature of which is lowered.
In the cooling method using the cooling device using the membrane of claim 1,
a first step in which the high-pressure steam is generated in the steam generator and supplied to the ejector;
a second step of generating suction force by causing a pressure drop as the high-pressure steam is injected at a high speed from the inside of the ejector unit;
a third step in which the water stored in the evaporator is vacuum evaporated by the suction force of the ejector unit to cool the evaporator; and
and a fourth step in which the moisture discharged from the ejector unit flows along the discharge flow path and then passes through the membrane and is sprayed to the outside.

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