JP2009150632A5 - - Google Patents

Description

Indirect vaporization cooling system Detailed Description of the Invention

In the present invention, only the sensible heat of the air in the cooled air zone is obtained by alternately arranging the layers of the humidified cooling zone (wet channel) and the cooled air zone (dry channel) used in the indirect vaporizer cooler. The present invention relates to an indirect vaporization type cooling device that cools water. In particular, the present invention relates to an indirect evaporative cooling device in which the heat exchange efficiency is improved by making the flow of air inserted into the base interposed between the humidified cooling zone and the cooled air zone countercurrent.

When air is humidified, a vaporization phenomenon occurs and latent heat is taken away, whereby the temperature of the air is cooled to the wet bulb temperature of the air. However, at the same time, the air to be cooled is humidified. This principle is widely known as humidification cooling from the following patent documents and the like, and evaporative coolers using the same are widely made and sold. When humidification of the released air is not desired, the humidified cooling zone (wet channel) and the zone through which the air to be cooled (dry channel) is separated, and the temperature cooled in the humidified cooling zone is heat exchanged In this way, only the sensible heat of the air in the zone to be cooled is cooled. A so-called indirect vaporizer cooler has already been manufactured and sold .

  JP-T-2004-513320   JP 2007-147117 A

In the invention described in Patent Document 1, a large number of flow holes are provided in a substrate arranged at the boundary of each channel, and the flow of air flowing into each adjacent channel is orthogonal. It is. In the cooling device described in Patent Document 2, the flow of stacked air to be cooled and the flow of air flowing into the wet zone are made to go straight, and a large number of holes are provided in the substrate or the shape of the substrate is reduced. Ninefold. In such a structure, the thermal efficiency is poor, and the apparatus becomes large to install in a store such as a convenience store, and similarly, it cannot be installed in a general household.

At the indirect evaporative cooling system, lowering the cooled air up to the dew point temperature of the air is theoretically possible, in order to realize it with the actual devices have the following problems.
(1) To maximize vaporization in the wet channel.
(2) The cooling heat generated in the wet channel is transferred to the cooled air passing through the dry channel with the maximum heat exchange efficiency.
(3) Since this is a device that sucks air, minimize the pressure loss of the device when considering commercial use.
(4) be a manufacturing method suitable for low cost mass production.
(5) Minimize the amount of water used to cause vaporization.
The indirect vaporization type cooling device of the present invention is intended to be improved and devised to improve the above problems.
Another object of the present invention is to provide an inexpensive indirect vaporization cooling device that is compact, has good cooling efficiency, and is inexpensive .

As means for solving the above problems,
The object of the present invention is to arrange a base between a wet channel (humidification cooling zone) for causing a vaporization phenomenon and a dry channel (cooled air zone), and these wet channel and dry channel. In an indirect evaporative cooling device in which the substrates are alternately arranged and cooled, the substrate is cooled by the vaporization phenomenon in the wet channel, and the air in the dry channel is cooled by heat exchange A plurality of protrusions as spacers are formed by embossing on one side of the bases of the wet channel and the dry channel, and a large number of embossed projections are formed on the base surface between the spacers so as to form a dent (dimple on the back side). ) Can be achieved by the configuration of the indirect vaporization cooling device characterized by being arranged in large numbers .

The object of the present invention is achieved by a configuration characterized in that the air flow in the wet channel and the air flow in the dry channel are countercurrent in the indirect vaporization cooling device. Can do .

  An object of the present invention is to provide an external static electricity in the wet channel in which a part of the air is adjacently arranged alternately at the exhaust outlet of the air cooled through the dry channels stacked. Indirect system that uses pressure to feed in, creates a countercurrent air flow in the wet channel from the air flow in the dry channel, and exhausts cold air from the exhaust ports provided on both sides of the previous base This can be achieved by the configuration of the evaporative cooling device.

  The object of the present invention is to form on the base surface so as to create a space of about 2 to 3 mm wide between the adjacent bases so that air flows smoothly through the wet channel and the dry channel that are stacked. This can be achieved by the configuration of the indirect vaporization type cooling device in which the spacer is circular.

  The object of the present invention is to provide the wet channel and the dry chip. This can be achieved by a configuration in which the base forming the channel is formed of a plastic sheet, and the base on which the woven fabric or the nonwoven fabric is bonded is laminated on the surface of the plastic sheet on the wet channel side.

  The subject of the present invention is a wet channel surface of the base of the wet channel and the dry channel, and a recess on the back surface formed by embossing on the base is a recess having a diameter of about 1.8 mm, and the dry channel This can be achieved by an indirect evaporative cooling device that rectifies the turbulent vortex generated by the spacer formed on the base of the air blown into the inside and expands the heat exchange area by this depression.

  The object of the present invention is to provide indirect evaporative cooling in which another exhaust port is provided on the opposite side of the stacked wet channel exhaust port so that return air from the outside flows into the wet channel. Can be achieved by equipment.

  The object of the present invention can be achieved by a structure in which a woven fabric provided on the wet channel side of the substrate or a substrate impregnated with an adsorbent for adsorbing water to the nonwoven fabric is laminated.

As a method of performing heat exchange between air and air, it is broadly divided into a parallel flow method in which air is inserted into each channel from the same direction as a method using a cross flow as described in Patent Document 1 and the like, and a wet channel and a dry channel. -There is a counter-current system in which the air flow is opposed to the channel.
In general, it is recognized that the parallel flow or counter flow system has better heat exchange efficiency than the orthogonal system. In addition, in the case of the parallel flow and the counter flow, the counter flow is recognized as being better in heat exchange efficiency.

In the indirect evaporative cooling device of the present invention, a plurality of spacers are formed on the base surface located at the boundary between the wet channel and the dry channel, and a large number of embossed convex portions (recesses on the back surface) are formed. Thus, the space of the air flow can be reliably maintained and the surface area is enlarged by the convex portion, so that not only the heat exchange efficiency is excellent, but also the weight of the plastic can reduce the whole .

In addition, the air flow in the wet channel and the dry channel is countercurrent, so not only can the cooling air be generated efficiently, but a part of the exhaust from the dry channel can be returned. It is efficient because it can be fed into the wet channel .

Since the indirect vaporization type cooling device of the present invention has a water absorption structure such as a woven fabric containing an adsorbent on the surface of the plastic, the efficiency due to the vaporization phenomenon is good.

(1) When compared with a conventional orthogonal indirect vaporizer, the following data was obtained.
(B) The cooling effect has been increased by about 30%.
(B) The in-machine pressure loss was about 1/3.
(2) It is possible to use a plastic molded product as the base of the wet channel and the dry channel, which facilitates mass production and can be produced at low cost.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention indirect evaporative cooling apparatus, will be described based on the embodiments shown in the drawings.
FIG. 1 is a diagram showing the shape of a base of a dry channel used in the indirect vaporization cooling device of the present invention, FIG. 2 is a partially enlarged explanatory view of the base of FIG. 1, FIG. 3 is a partially enlarged sectional view of FIG. FIG. 5 is a partially enlarged explanatory view of the base of FIG. 4, FIG. 6 is a partially enlarged cross-sectional explanatory view of FIG. 4, and FIG. 7 is an indirect type of the present invention. FIG. 8 is an inflow side arrow view of the indirect evaporative cooling device of the present invention, FIG. 9 is an exhaust air side arrow view, FIG. 10 is a side view of the finished product, and FIG. It is expansion explanatory drawing of the side view of a finished product .

(1) In order to generate the maximum vaporization phenomenon in the wet channel in the indirect vaporization type cooling device of the present invention ,
(B) Method of supplying water to the wet channel.
(B) Bleeding method using capillary phenomenon.
(C) Consider the length of the flow path.
In particular, it is necessary to appropriately select the water supply flow rate and the diversion rate. As a result of test analysis based on experimental values , these elements are appropriate values of a flow path length of 300 mm, a flow path width of 200 mm, a flow path height of 2 to 3 mm, and a flow velocity of 1 to 4 seconds.

(2) Since there should be no humidity / moisture transfer between the wet channel and the dry channel, it is necessary to use plastic such as polypropylene that does not displace water as the base for the partition walls of both channels. preferable. The plastic partition is about 0.3 mm thick in order to maximize the heat exchange efficiency.

(3) In order to create an air flow, it is necessary to make a space of 2 to 3 mm high in the wet channel and the dry channel. For this purpose, it is possible to integrally mold with plastic. A circular spacer 2 having a diameter of 5 mm and a height of about 3 mm is disposed between the substrates .

(4) If the circular spacer is disposed between the bases, it causes a turbulent vortex in the sent air. The air passing through the channel should be rectified as much as possible, so as a means to rectify the turbulent vortices generated by the circular spacers, many embosses based on small dimples such as golf dimples. It rectifies by attaching with. The size of the "depression" (dimple) this is preferably a diameter of 1.8mm high 0.3mm about.

(5) The “indentation” of the substrate surface by the above-mentioned embossing prevents the turbulent flow of the air flow, and has the effect of increasing not only the rectification but also the heat exchange area.

(6) Since the plastic substrate has a smooth surface, a film layer for wetting water is provided on the surface of the plastic plate. As this film layer, a woven fabric or a non-woven fabric is used. The material is suitably paper such as cellulose or polypropylene. The thickness of the membrane layer is suitably about 0.2 mm to 0.5 mm. This film layer is bonded to the surface of the plastic plate on the wet channel side or bonded by thermocompression to form a base.

(7) In order to allowed to occur to maximize the vaporization phenomenon in the wet in the channel, the amount of water to be introduced into the wet channel is a fair extent to which moist To Jiwa', vaporization phenomenon is reversed in such a state water flows Will be less. For this purpose, a woven fabric is wet film, nonwoven fabric, allowed to impregnate the paper in advance adsorbent such as cellulose (high adsorption and desorption of water), the contact Ku by holding the water in the wet film is preferred.

(8) Regarding the method of flowing air to the wet channel and the dry channel of the indirect vaporization type cooling apparatus of the present invention , the dry channel always flows air in one direction. Various methods are conceivable as a method for flowing a part of the air passing through the dry channel into the wet channel. In the present invention, a static pressure is applied to the outside on the air outlet side of the dry channel. Only a part of the air was found to flow into the open wet channel (see FIG. 11) .

  The amount of air introduced to the wet channel side is suitably 30 to 50% of the amount of air flowing through the dry channel. By changing the external static pressure on the outlet side of the dry channel, a part of the air coming out of the dry channel flows into the wet channel. In this case, according to experimental values, when a static pressure of about 90 to 100 Pascal is applied as the external static pressure, about 30% of air flows into the wet channel. The air flowing into the wet channel is exhausted from the exhaust port of the wet channel to the outside after causing a vaporization phenomenon in the wet channel.

(9) In addition to using only outside air, return air from a room with good temperature and humidity conditions may be used. In this case, there is a method in which the temperature of the air passing through the dry channel is further lowered by allowing only the return air having a good condition to flow into the wet channel, instead of using the return air mixed with the outside air. For this purpose, return air is introduced into the wet channel from the exhaust outlet of the wet channel, and after passing through the wet channel to cause vaporization phenomenon, it is opposite to the exhaust outlet of the wet channel. Another exhaust port is provided and exhausted from there.

  The indirect vaporization cooling device of the present invention will be described with reference to the drawings.
  FIG. 1 to FIG. 3 are explanatory views of the base 1 arranged on the dry channel side. A plurality of circular spacers 2 are formed on the surface of the plastic sheet by embossing, and a large number of dimples are arranged between the arranged spacers 2. 3 is formed by embossing (since this dent 3 is small 1 and 4 are indicated by dot patterns). Shield walls 6 and 6 (to prevent air flow to the side) are provided on the left and right edges of the plastic sheet, and are opened for the exhaust port 7 on both upper sides in FIG. Air flow in the channel is restricted by the shielding walls 6 and 6. 4, a supply pipe 4 for supplying cooling water arranged in the center is arranged, and a plurality of jet nozzles are provided. Even if this supply pipe 4 is not provided, it may be supplied by other methods, for example, by dipping in a water tank as in Patent Document 1 and by a capillary phenomenon with a cloth or the like. Reference numeral 5 denotes a water retaining film layer 5 such as a woven fabric or a non-woven fabric on the back surface (wet channel side) of the plastic sheet. Reference numeral 9 denotes an engaging piece for stacking the substrates 1 (with the wet channel substrate 1a). Reference numeral 11 denotes an engaging edge piece projecting to the inflow side of the air to be cooled, and engages with the engaging edge piece 11a of the base 1a on the wet channel side to block the entry of air.

  FIGS. 4 to 6 are explanatory views of the base 1a arranged on the wet channel side, in which the plastic sheet is provided with the spacer 2 and the depression 3 and the shielding walls 6 and 6 and the exhaust port 7 are provided on both sides. Same as channel base 1. The film layer 5 which is a water holding member is bonded to the upper surface, and the engaging piece 9a projects downward. The wet channel engaging piece 9a and the dry channel engaging piece 9 hold the two substrates 1 and 1a in an engaged state. Reference numeral 10 denotes a shielding member for preventing the inflow of air into the wet channel, and there is an engagement edge piece 11a projecting outside. This prevents inflow when the cooled air is blown into the dry channel.

  Description of the operation of the indirect vaporization cooling device of the present invention.
  As shown in FIG. 7, water is supplied to the supply tank 4 and cooling water is held in the wet channel. Insert into the dry channel from the inlet side of the air to be cooled. At this time, it is blocked by the engaging edge pieces 11 and 11a into the wet channel. Passed through the dry channel Although air is exhausted from the exhaust side, a static pressure of 90 to 100 Pascals is loaded near the outlet, and part of the exhausted air returns into the wet channel and passes through the wet channel. The substrate 1 is cooled by the vaporization phenomenon of the moisture adsorbed in the layer 5. The moisture-containing air is exhausted from the exhaust port 7. In this way, the air in the dry channel is cooled by heat exchange. At this time, the indentation 3 provided in the substrate 1 provides good thermal efficiency.

(B) This machine cools air using only the vaporization phenomenon of water and does not use any refrigerant gas. The use of refrigerant gas is considered to be a cause of global warming and has a great effect on CO2 reduction. Further, since no compressor, no energy such as electricity and gas is used, the utility value is very wide.
(B) In addition to the usage method of directly treating the outside air, there is a method of using the air dehumidified by the desiccant air conditioner by introducing it into this indirect vaporizer cooler. The cooling performance of this indirect vaporizer is that the lower the dew point temperature of the inlet air, the more vaporization occurs, so the outlet temperature decreases and a desiccant air conditioner is used to lower the dew point of the inlet air. The system that lowers the temperature with this indirect evaporative cooler without humidifying the air whose dew point has been lowered by the desiccant air conditioner is extremely useful as an external conditioner.

  One embodiment of the indirect vaporization cooling device of the present invention It is a board | substrate top view of a lie channel.   FIG. 2 is an enlarged explanatory view of a spacer portion in FIG. 1.   It is a cross-sectional schematic explanatory drawing of FIG.   1 is a plan view of a base of a wet channel according to an embodiment used in the indirect vaporization type cooling apparatus of the present invention.   FIG. 5 is an enlarged explanatory view of a spacer portion in FIG. 4.   It is a cross-sectional schematic explanatory drawing of FIG.   It is a completed product drawing of the indirect vaporization type cooling device of the present invention.   It is an inflow air side arrow surface of FIG. 7 of this invention apparatus.   It is an exit air side arrow line view of FIG. 7 of this invention apparatus.   FIG. 8 is a side view of FIG. 7.   It is the elements on larger scale of FIG.

1, 1a ... Base (Plastic made of woven or non-woven fabric)
2 ... spacer (projections for making the space with a height in the channel of)
3 ... depression (dimple )
4 ... Supply pipe
5 ... Woven or non-woven fabric
6 ... barrier
7 ... Exhaust port
8 ... Incoming air
9, 9a ... engagement piece
10 ... Shielding member
11, 11a ... engagement edge piece

Claims (8)

And wet channels for causing vaporization phenomenon, placing the foundation between the dry channel through which the air to be cooled, are arranged by stacking with these wet channels and a dry channel to place alternately In an indirect evaporative cooling device in which the base is cooled by the vaporization phenomenon in the wet channel, and the base that cools the air in the dry channel by heat exchange is arranged,
A plurality of protrusions as spacers are formed on one side of the base of the wet channel and the dry channel, and a plurality of embossed projections are formed on the base surface between the spacers, and depressions are arranged on the back side. An indirect evaporative cooling device characterized by that . And wet channels for causing vaporization phenomenon, placing the foundation between the dry channel through which the air to be cooled, are arranged by stacking with these wet channels and a dry channel to place alternately In an indirect evaporative cooling device in which the base is cooled by the vaporization phenomenon in the wet channel, and the base that cools the air in the dry channel by heat exchange is arranged,
A plurality of protrusions as spacers are formed on one side of the base of the wet channel and dry channel, and a plurality of embossed projections are formed on the base surface between the spacers to form indentations on the back surface. An indirect evaporative cooling apparatus characterized in that the air flow in the wet channel and the air flow in the dry channel are countercurrent . At the exhaust outlet of the air cooled through each of the stacked dry channels, the air is sent to the inside of the wet channel where a part of the air is disposed adjacent to the exhaust outlet , The air flow in the dry channel is a countercurrent air flow in the wet channel, and cool air is exhausted from exhaust ports provided on both sides of the base. 2. The indirect vaporization cooling device according to 2 . A plurality of the spacers arranged in a circle to form a space having a height of about 2 to 3 mm between the adjacent substrates so that air flows through the wet channel and the dry channel, respectively, are circular. The indirect vaporization type cooling device according to claim 2 or 3 . Said wet channels, base to form the dry channel is formed in the plastic sheet, the wet channel side of the surface of the plastic sheet, woven fabric or laminated arranged foundation nonwoven is bonded bonded The indirect vaporization type cooling device according to any one of claims 2 to 4, wherein: On the wet channel surfaces of the bases of the wet channel and the dry channel, a recess formed by embossing on the base is a recess having a diameter of about 1.8 mm, and is formed on the base of the air blown into the dry channel. 6. The indirect evaporative cooling apparatus according to claim 1, wherein the turbulent vortex generated by the spacer is rectified and the heat exchange area is expanded by the depression . 7. A separate exhaust port is provided on the opposite side of the stacked wet channel exhaust port so that return air from the outside flows into the wet channel. The indirect vaporization type cooling device described in 1 . 8. The base of the indirect vaporization cooling device according to claim 1, wherein an absorbent for adsorbing water is impregnated on a woven fabric or a non-woven fabric provided on the wet channel side of the base. .

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