JP3909534B2 - Jet heat exchanger and evaporative condenser using the heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a condenser using a cooling medium such as a gas, an evaporator or a jet heat exchanger also serving as an evaporator condenser, and an evaporation condenser using the same.
[0002]
[Prior art]
Conventional heat exchangers used in condensers, evaporators, and the like have a structure in which heat flows from a refrigerant through the wall of the refrigerant pipe to water or air as a cooling medium.
For example, in the case of an air-cooled condenser, as shown in FIG. 6, heat exchange is performed between the refrigerant in the pipe of the finned coil 50 and the outside air that is a cooling medium that flows outside the intake pipe from the outside air inlet 52. In this case, a plate fin heat exchanger provided with fins 50a having a large area on the outside is used for a coil that is generally a refrigerant tank.
[0003]
Further, as shown in FIG. 7, the conventional evaporative condenser wets the outer surface of the refrigerant pipe 55 through which the refrigerant passes with the spray water 56a and takes in air as a cooling medium through the fan 57 to A coil structure that cools the refrigerant by using latent heat of vaporization is used. In this case, the spray water 56a is circulated and sprayed from the sprinkling reservoir tank 58 by the pump 59 through the spray pipe 56.
[0004]
By the way, in the case of the conventional plate fin heat exchanger, the heat transfer coefficient on the air side, which is the cooling medium, is very small compared to the heat transfer coefficient on the refrigerant side. It is necessary to add a heat area. For this reason, it is necessary to provide fins having a large area outside the refrigerant pipe, resulting in a problem of poor space efficiency.
Further, when the air temperature is lowered in the case with the fin, there is a problem that moisture in the air frosts on the fin to reduce the heat transfer area and lower the heat transfer efficiency.
Further, in the case of a finned refrigerant tube, there is a problem that the heat exchange rate is lowered if there is a temperature change in the passing airflow.
[0005]
In the case of the evaporative condenser, a large amount of water is used as spray water, and the refrigerant pipe has a coil structure, so that a large amount of refrigerant is always held in the coil. In the case of leakage, there is a downside that the amount of leakage increases.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and is mainly composed of heat conduction by laminar flow when transferring heat of the refrigerant from the pipe wall of the refrigerant pipe to the air side outside the pipe wall. In contrast to the conventional method in which the heat transfer coefficient is slightly improved by preventing the development of the temperature boundary layer by cutting up on the fin surface, in the present invention, the flow of the cooling medium on the heat transfer surface is laminar. The transition to a more unstable turbulent flow causes turbulent diffusion of enthalpy, which is a physical quantity, so as to improve the heat transfer coefficient, so that the cooling medium is made to collide with the heat transfer wall in the form of a jet. A collision jet is formed, a turbulent flow is formed in the wall jet region on the heat transfer surface, and after the right and left separation at the stagnation point between adjacent collision jets, the collision of the opposing jets is caused in the wall jet region, and the heat efficiency Is intended to promote external diffusion .
[0007]
Therefore, using a flat heat exchange panel in place of a conventional refrigerant pipe, to form air impingement jets are cooling medium to the panel surface of the panel,該噴flow on the panel surface after the collision to the panel surface A two-dimensional turbulent wall surface jet is formed in the wall surface jet region formed on the surface to enable highly efficient heat transfer.
Thus, the jet flow that has received and received the high-efficiency heat forms an opposing jet flow with the two-dimensional turbulent wall jet formed in the same manner from the adjacent slit, and forms an upward discharge flow by the collision. Thus, it is possible to provide a heat exchanger having a remarkably high heat transfer coefficient by allowing diffusion to the outside.
[0008]
Moreover, as an evaporative condenser, water is mixed into the jet air of the jet heat exchanger to achieve high efficiency utilization of the latent heat of water.
[0009]
[Means for Solving the Problems]
Therefore, the jet heat exchanger of the present invention is
An upright plate-shaped heat exchange panel, and a plurality of rows of upright slit groups that collide a jet of a high-speed cooling medium perpendicularly to the panel surface of the panel to form a collision jet, and
Furthermore, the plurality of rows of upright slit groups are planted on the inclined surface of the trapezoidal high-speed cooling medium supply duct extending in parallel with the upright flat plate heat exchange panel, and an open space is formed outside the slits. The space is used to form a discharge path for the upward discharge flow .
[0010]
Further, a plurality of rows upstanding slit groups of the present invention is to induce collision of opposing jets in the collision after wall jet region jets each other on the panel surface from adjacent slits, arranged in a suitable distance so as to form an upper discharge flow It is good.
[0011]
[0012]
In addition, it is preferable that the plural rows of upright slit groups of the present invention and the upright flat plate-like heat exchange panel surface are alternately arranged in parallel in a sandwich shape with an appropriate distance therebetween .
[0013]
The cooling medium of the present invention ing, for example, by air.
[0014]
Moreover, the evaporative condenser using the jet heat exchanger of the present invention is
As described in claim 5, and an upright plate-shaped heat exchange panel, a plurality of rows upstanding slit groups to form a collision jet to collide with jets of fast cooling medium vertically to the panel plane of the panel, and more configuration jets In the heat exchanger
The cooling medium is composed of a mixed phase flow of air and water, and a water droplet spray nozzle for forming the mixed phase flow is provided in the high-speed cooling medium,
Further, the plural rows of upright slit groups are planted on an inclined surface of a trapezoidal high-speed air flow supply duct extending in parallel to the upright flat plate heat exchange panel, and an open space is formed outside the slits. Thus, the discharge path for the upward discharge flow is formed .
[0015]
Further, the plurality of rows upright slits group to induce collision of opposing jets in the collision after wall jet region jets each other on the panel surface from adjacent slits, is to arrange a proper interval so as to form an upper discharge flow Good.
[0016]
[0017]
Further, the A plurality of rows upright slits group and the upright tabular heat exchange panel surface, facing juxtaposed to sandwich alternately at a suitable distance, preferably set to configuration.
[0018]
[Action]
Accordingly, a jet heat exchanger according to the present invention corresponding to claim 1 is an upright flat plate heat exchange panel used in place of a conventional coiled refrigerant pipe, and 2 of the cooling medium on the panel surface of the heat exchange panel. In order to form a collision jet by a three-dimensional jet, a plurality of rows of upright slits arranged in parallel at an appropriate distance from the panel surface are provided. Therefore, the high-speed cooling medium made of the cooling medium blown toward the panel surface of the upright flat plate-shaped heat exchange panel that is opposed to the multiple rows of upright slit groups forms a two-dimensional jet and is the heat transfer surface. After the collision, the separated jet is divided into left and right from the stagnation point of the collision center, and the separated jet forms a two-dimensional turbulent wall jet in the wall jet region downstream of the collision region where the stagnation point exists.
Due to the two-dimensional turbulent wall jet, turbulent heat transfer is performed between the cooling medium and the heat transfer surface, which is not as efficient as conventional laminar heat transfer.
In other words, heat transfer by laminar flow is performed only by heat conduction, but in turbulent heat transfer, in addition to heat transfer by heat conduction, enthalpy transport due to turbulent flow overlaps, so it is significantly more difficult than laminar flow. Has a large heat transfer coefficient. In addition, the high-efficiency heat transfer is performed in the wall jet region developed downstream of both sides of the stagnation point.
In addition, a plurality of rows of upright slit groups are implanted on both sides or on one side of the trapezoidal high-speed cooling medium supply duct with a cross-sectional shape extending in parallel to the upright flat plate heat exchange panel at the opposite position. An open space upward is formed outside the adjacent slits. Therefore, until the collision jet flow on the panel surface forms a two-dimensional turbulent wall jet formation countercurrent jet and the counterflow jets collide with each other, the heat transfer in the wall jet region is finished and heated. The medium becomes an upward discharge flow, diffuses to the outside of the boundary layer, rises in the open space and is discharged outside without staying in the lower part.
[0019]
In the invention of claim 2, wherein said plurality of rows upstanding slit groups of the slit spacing set appropriately in which the following upper discharge flow has to be efficiently formed. That is,
Impinging jet blown parallel to the slit each other in adjacent positions are separated on left and right from the stagnation point after impinging on the panel surface of the upright plate-shaped heat exchange panel. The two-dimensional turbulent wall jet with each other are formed on the wall jet region downstream of the collision area, collisions at the end of the wall jet region becomes opposed jet is induced. An upward discharge flow is formed by the collision.
Since the two-dimensional turbulent wall jets collide with each other to form an upper discharge flow by appropriately setting the interval between adjacent slits, the multi-stage slit structure allows the wall jet region to be previously introduced by the collision jet. The cooling medium that has exchanged heat with high efficiency can be separated and discharged outside the boundary layer of the wall surface jet region by the collision of the counterflow jet.
[0020]
[0021]
In the invention according to claim 3 ,
The plurality of rows of upright slit groups are arranged at an appropriate distance necessary for the formation of the impinging jet with respect to both sides of the panel of the upright flat plate heat exchange panel. → ... → Double-sided panel → Multi-row single-sided upright slit group and sandwiched and arranged side by side, the required heat exchange space can be set appropriately.
[0022]
In the invention described in claim 4 , for example, air is used as the cooling medium.
[0023]
Moreover, in invention of Claim 5 , it is related with the evaporative condenser using the jet-type heat exchanger of the said Claim 1 ,
In a jet heat exchanger comprising an upright flat plate heat exchange panel, and a plurality of upright slit groups that collide a jet of a cooling medium perpendicularly to the panel surface to form a collision jet,
The cooling medium is composed of a mixed phase flow of air and water, and the water droplet spray nozzle for forming the mixed phase flow is provided in a high speed air stream as a high speed medium.
In addition to the effects of nozzle-type heat exchanger of claim 1, in admixture with air and a monitor water, because you have to form a jet of from upright slit of the plurality of rows, multiphase of said air and water The sensible heat and latent heat of the flow enables high-speed heat exchange with respect to the refrigerant, and can condense the refrigerant with high efficiency.
[0024]
In the invention of claim 6, wherein said set appropriately the interval between the slits in the upright slit group, countercurrent jets together in the formation after the wall jet region collision jet at jet panel surface from the slit Is generated at an appropriate position near the end of the wall jet region to form an upward discharge flow. Optimal conditions are the transfer of heat via the sensible heat of air and the latent heat of water in the wall region. It is something that is done in.
[0025]
Further, the action of the seventh aspect of the present invention, has an action similar to the action in the invention of claim 3.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention unless otherwise specified. Absent.
FIG. 1 is a perspective view showing a schematic configuration of a jet heat exchanger according to the present invention, and FIG. 2 is a diagram showing a situation of a collision jet region and a wall surface jet region formed by a collision jet. FIG. 3A is a schematic diagram showing a state in which the jet blown out from the slit forms a collision jet and then becomes an upward discharge flow and is discharged to the outside. FIG. 3B is an upright plate-like heat that is a heat transfer surface. It is a top view which shows the condition of the heat exchange between the jets in the panel surface of an exchange panel. FIG. 4 is a perspective view showing a schematic configuration when the jet heat exchanger of the present invention is used as an evaporative condenser. 5A is a view showing a situation where a multiphase flow mixed with water droplets is sucked into the slit in the VV view of FIG. 4, and FIG. 5B is a partially broken partial plan view of FIG. It is a figure which shows the condition where the jet of the multiphase flow of a water droplet forms a collision jet on the panel surface of a heat exchange panel.
[0027]
As shown in FIG. 1, the jet heat exchanger of the present invention includes a plurality of upright flat plate heat exchange panels 10, 10,... That condense refrigerant and sandwiched so as to sandwich the panel 10. A plurality of upright slit groups 12 having slits 12a, a high-speed air flow supply duct 11 which is a high-speed cooling medium in which the slit groups 12 are implanted, and a high-speed air flow fan for forming a high-speed air flow through the slits 12a 13 and more.
[0028]
The high-speed air flow supply duct 11 is composed of a casing having a trapezoidal cross-sectional shape arranged in parallel with the upright flat plate-shaped heat exchange panel 10 at an appropriate distance, and has one or both sides of a tapered inclined surface 11a. Are arranged at appropriate intervals to form a plurality of series slit groups 12, and the high-speed air flow fan 13 is used to convert the outside air into a high-speed air flow 21 under the high-speed air supply ducts 11, 11,. As shown in FIG. 2, it blows out from the slit 12a implanted, and forms the jet 12b.
It should be noted that an optimal impingement jet that blows out the jet 12b perpendicularly to the panel surface and faces the discharge port of the slit 12a at an appropriate distance from the panel surface 10a that is the heat transfer surface of the upright flat plate heat exchange panel 10. 15 is formed. In addition, the slits 12a are set so that the interval between adjacent slits is set appropriately, and a plurality of rows of upright slits 12 are configured so as to efficiently transfer heat by a two-dimensional turbulent wall jet 14 described later. I have to do it.
[0029]
In addition, the upright flat plate heat exchange panel 10 and the multiple rows of upright slit groups 12 are such that the multiple rows of upright slit groups 12 always sandwich and face the panel surfaces 10a on both sides of the upright flat plate heat exchange panel 10 as shown in FIG. As shown in FIGS. 3A and 3B, an open space 18 is formed in the outer space of the adjacent slits 12a and 12a, and a discharge path for the upper discharge flow 20 to be described later is formed. .
[0030]
Since it is the said structure, as shown in FIG. 2, the high-speed air current blown out at high speed perpendicularly | vertically toward the panel surface 10a from the slit 12a forms the two-dimensional jet 12b, and collides with the panel surface 10a, and forms the collision jet 15 To do. The collision jet 15 is divided into left and right in the collision jet area 16 at the collision stagnation point with the panel surface 10a, and a two-dimensional turbulent wall jet 14 is formed in the wall surface jet area 17 on the downstream side.
In the turbulent boundary layer in the two-dimensional turbulent wall jet 14, the fluid motion in the direction perpendicular to the wall is active, the enthalpy transport is large, and the amount of heat transfer to the wall is significantly larger than the laminar flow due to heat conduction alone. have.
[0031]
As shown in FIGS. 3A and 3B, the two-dimensional turbulent wall jet 14 formed in the wall jet region 17 by the jets of the slits as described above forms opposed jets facing each other between adjacent slits. Then, it collides at the end portion of the wall surface jet region 17 to form an upper discharge flow 20, 20 ... and diffuses and leaves outside the boundary layer 17a.
That is, the two-dimensional turbulent wall jet 14 that has finished transferring heat by turbulent heat transfer in the wall jet region 17 forms an upper discharge flow 20 at an appropriate end position of the wall jet region and is discharged to the outside air. The
[0032]
As described above and as shown in FIG. 3B, the jet heat exchanger of the present invention is designed to form turbulent heat transfer only in the wall surface jet region 17 which is a part necessary for heat transfer. This is an efficient heat exchanger in which impinging jets 15 are formed at appropriate positions and intervals on the panel surface.
In addition, by providing a plurality of rows of slit-shaped discharge ports opened in the vertical direction in the horizontal direction, a high-speed air flow is blown to the heat exchange panel surface, which is a heat transfer surface, so that the panel surface has a constant temperature. A stable heat exchange rate can be obtained by collision of the airflow. In addition, the frosting phenomenon can be eliminated by colliding the high-speed airflow with the heat exchange panel surface, and heat exchange with a certain capacity is possible.
[0033]
FIG. 4 shows a schematic configuration of an evaporative condenser using the jet heat exchanger of the present invention shown in FIG. As shown in FIGS. 4 and 5 (A), the evaporative condenser of the present invention uses a mixed phase flow of air and water as the cooling medium of the jet flow heat exchanger of FIG. Are provided at the base of the high-speed air flow supply ducts 11, 11,..., And the water droplets 23 a are sprayed from the water tank 24 through the pump 28 and the water supply pipe 22 into the high-speed air flow. The multiphase jet is caused to collide perpendicularly with the panel surface 10a of the heat exchange panel 10 through the upright slit 12a to form a collision jet 23b by the multiphase flow shown in FIG. 5B.
[0034]
Because of the above configuration, water and air are collided at high speed with the air on the heat exchange panel surface to exchange heat, but as described above, air and water contact only the heat transfer surface necessary for heat exchange and turbulent flow occurs. Heat transfer takes place.
[0035]
【The invention's effect】
With the above configuration, the jet heat exchanger and the evaporative condenser of the present invention enable turbulent heat transfer to enable highly efficient heat exchange or condensation.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a jet heat exchanger according to the present invention.
FIG. 2 is a diagram illustrating a situation of a collision jet region and a wall surface jet region formed by the collision jet of FIG. 1;
FIG. 3A is a schematic diagram showing a state in which the jet blown out from the slit in FIG. 1 forms a collision jet and then becomes an upward discharge and is discharged upward.
(B) is a top view which shows the condition of the heat exchange between the jets in the panel surface of the upright flat plate-shaped heat exchange panel which is a heat-transfer surface in FIG.
FIG. 4 is a perspective view showing a schematic configuration when the jet heat exchanger of the present invention is used as an evaporative condenser.
5A is a view showing a state in which a multiphase flow mixed with water droplets is sucked into the slit in the VV view of FIG. 4; FIG.
(B) is the top view of FIG. 4, and is a figure which shows the condition where the jet of the multiphase flow of an air and a water droplet forms a collision jet to the panel surface of a heat exchange panel from a slit.
FIG. 6 is a diagram showing a schematic configuration of a conventional air condenser.
FIG. 7 is a diagram showing a schematic configuration of a conventional evaporative condenser.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Upright flat plate heat exchange panel 10a Panel surface 11 High-speed air flow supply duct 11a Inclined surface 12 Multiple row upright slit group 12a Slit 12b Jet 13 High-speed air blower fan 14 Two-dimensional turbulent wall jet 15 Collision jet 15a Stagnation point 16 Collision jet Region 17 Wall jet region 18 Open space 20 Upper discharge flow 21 High-speed air flow 23 Multiphase flow 25 Water droplet nozzle

Claims (7)

An upright plate-shaped heat exchange panel, and a plurality of rows of upright slit groups that collide a jet of a high-speed cooling medium perpendicularly to the panel surface of the panel to form a collision jet, and
Furthermore, the plurality of rows of upright slit groups are planted on the inclined surface of the trapezoidal high-speed cooling medium supply duct extending in parallel with the upright flat plate heat exchange panel, and an open space is formed outside the slits. A jet heat exchanger characterized in that a discharge path for an upward discharge flow is formed by the space. Said plurality of rows upright slits group, characterized by induced collision of opposing jets in the collision after wall jet region jets each other on the panel surface from the adjacent slits was placed in a proper interval so as to form an upper exhaust flow, that The jet heat exchanger according to claim 1.   The jet-type heat exchange according to claim 1, wherein the plurality of rows of upright slit groups and the upright flat plate-like heat exchange panel surface are arranged to face each other alternately in a sandwich shape with an appropriate distance therebetween. vessel.   The jet heat exchanger according to claim 1, wherein the cooling medium is made of air. In a jet heat exchanger constituted by an upright flat plate heat exchange panel, and a plurality of rows of upright slit groups that collide a jet of a high-speed cooling medium perpendicularly to the panel surface of the panel to form a collision jet,
The cooling medium is composed of a mixed phase flow of air and water, and a water droplet spray nozzle for forming the mixed phase flow is provided in the high-speed cooling medium,
Further, the plural rows of upright slit groups are planted on an inclined surface of a trapezoidal high-speed air flow supply duct extending in parallel to the upright flat plate heat exchange panel, and an open space is formed outside the slits. An evaporative condenser characterized in that a discharge path for the upper discharge flow is formed . Said plurality of rows upright slits group, characterized by induced collision of opposing jets in the collision after wall jet region jets each other on the panel surface from the adjacent slits was placed in a proper interval so as to form an upper exhaust flow, that The evaporative condenser according to claim 5 . 6. The evaporative condenser according to claim 5, wherein the plurality of rows of upright slit groups and the upright flat plate heat exchange panel surfaces are alternately arranged in parallel and sandwiched at an appropriate distance. .

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