Evaporative heat exchange device and evaporative heat exchange device heat exchange method

Abstract

The application discloses an evaporative heat exchange device, which comprises a heat exchanger and a fan capable of blowing out liquid-containing air, and a plurality of fans are arranged in parallel on the air inlet side of the heat exchanger along a direction perpendicular to the air inlet direction, and at least two of the fans can be independently switched on and off. When it is necessary to reduce the heat exchange efficiency of the heat exchanger, some of the fans are turned off, and the rest of the fans are kept on, thereby reducing the air volume and changing the liquid content entering the heat exchanger, so as to adjust the heat exchange efficiency of the heat exchanger. At the same time, for the on fans, the air volume of the fans does not change, so that the cooling effect of the on fans is effectively ensured, and the cooling effect is more stable. Meanwhile, the air volume of the fans is efficiently utilized, and the liquid particles are also efficiently utilized, so that the energy is fully utilized. The application further discloses a heat exchange method of the evaporative heat exchange device.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more specifically, to an evaporative heat exchanger and a heat exchange method using an evaporative heat exchanger. Background Technology

[0002] Current evaporative condensers mainly consist of a casing, heat exchanger, fan, and spray system. The heat exchanger is housed within the casing, with air inlets on both sides below the heat exchanger. A fan is positioned above the heat exchanger to draw air upwards. The spray system is located between the fan and the heat exchanger, spraying water downwards onto the heat exchanger. A water collection tank is located directly below the heat exchanger to catch the flowing water. When the hot surfaces of the heat exchanger come into contact with the water, it promotes evaporation, thus evaporative heat exchange. The fan then carries away the evaporated water vapor, removing heat.

[0003] Currently, some systems also use fans to blow air onto the heat exchanger, while high-humidity gas is introduced through the fan's inlet. Because the fans are generally axial flow fans, the blown air is usually cylindrical, while the heat exchanger is usually a block with a square horizontal distribution area. This makes it difficult for the air blown out of the fan outlet to cover all areas well, resulting in the central area of ​​the structure appearing heavier than the peripheral areas when viewed from above.

[0004] More importantly, through long-term practice, the inventors discovered that for a single fan, because it needs to blow out liquid-containing air, the air volume cannot be too low. This makes it impossible to change the heat dissipation efficiency by changing the fan speed, causing the fan to do a lot of useless work, which in turn leads to energy waste.

[0005] In summary, how to effectively solve the problem of energy waste when adjusting the heat dissipation efficiency of current evaporative heat exchangers is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the first objective of the present invention is to provide an evaporative heat exchange device that can effectively solve the problem of energy waste when adjusting the heat dissipation efficiency of current evaporative heat exchange devices. The second objective of the present invention is to provide a heat exchange method for an evaporative heat exchange device.

[0007] To achieve the first objective mentioned above, the present invention provides the following technical solution:

[0008] An evaporative heat exchange device includes a heat exchanger and a fan capable of blowing out liquid-containing air. On the air inlet side of the heat exchanger, multiple fans are arranged side by side in a direction perpendicular to the air inlet direction, and at least two of the fans can be turned on and off independently.

[0009] In this evaporative heat exchanger, when it is necessary to reduce the heat exchanger's efficiency, some of the fans are turned off while the others remain on. This reduces the incoming airflow and alters the liquid content entering the heat exchanger, thus regulating its efficiency. Simultaneously, because the airflow of the on fans remains unchanged, the characteristics of the humidified air discharged by the fans are not altered, and the path of liquid particles is not reduced, effectively ensuring the cooling effect of the on fans and making the cooling effect more stable. Furthermore, the efficient use of both fan airflow and liquid particles ensures full energy utilization. In conclusion, this evaporative heat exchanger effectively solves the problem of energy waste during the adjustment of heat dissipation efficiency in current evaporative heat exchangers.

[0010] Preferably, the air outlet direction of at least one of the fans is adjustable.

[0011] Preferably, it further includes a rotation drive device, which is capable of driving the movement of at least one of the fans to continuously change the air outlet direction of the fans.

[0012] Preferably, the four fans are arranged in a square or rectangular configuration, with another fan located at the center between the four fans arranged in a rectangular configuration.

[0013] Preferably, the fan is a centrifugal humidifier.

[0014] Preferably, the air outlet of each of the fans is arranged facing upwards.

[0015] Preferably, the system further includes a controller, which controls a storage device to record the operating time of each of the fans, and when a start-up command is received for some of the fans, controls the fans with the shorter total operating time to start up.

[0016] Preferably, it also includes a temperature detector for detecting the temperature of the heat exchanger, which can send a start command for part of the fan to the controller when the detected value is within a preset range.

[0017] Preferably, the heat source inlet of the heat exchanger is provided with the temperature detector.

[0018] To achieve the second objective mentioned above, the present invention also provides a heat exchange method for an evaporative heat exchanger, which includes the following steps: obtaining the temperature at the heat exchanger; and, based on the temperature at the heat exchanger, selecting and activating a corresponding number of humidifying fans on the air inlet side of the heat exchanger. Since the aforementioned evaporative heat exchanger has the above-mentioned technical effects, heat exchange methods for evaporative heat exchangers employing similar heat exchange methods should also have corresponding technical effects. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the evaporative heat exchanger provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of a partially inclined evaporative heat exchanger provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the distribution structure of four fans provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the distribution structure of five fans provided in an embodiment of the present invention;

[0024] Figure 5 This is a schematic flowchart of the heat exchange method of the evaporative heat exchanger provided in an embodiment of the present invention.

[0025] The following labels are shown in the attached diagram:

[0026] Heat exchanger 1, fan 2, casing 3. Detailed Implementation

[0027] This invention discloses an evaporative heat exchange device to effectively solve the problem of energy waste when adjusting the heat dissipation efficiency of current evaporative heat exchange devices.

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-5 , Figure 1 This is a schematic diagram of the structure of the evaporative heat exchanger provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a partially inclined evaporative heat exchanger provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the distribution structure of four fans provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the distribution structure of five fans provided in an embodiment of the present invention; Figure 5This is a schematic flowchart illustrating the heat exchange method of the evaporative heat exchange device provided in an embodiment of the present invention. In one specific embodiment, this embodiment provides an evaporative heat exchange device, which mainly includes a heat exchanger 1 and multiple fans 2. It generally also includes a casing 3, where the heat exchanger 1 is placed inside the casing 3, and the fans 2 are generally also located inside the casing 3 or installed through one side wall of the casing 3. Alternatively, the casing 3 can be omitted, in which case the heat exchanger 1 can be exposed.

[0030] Heat exchanger 1 is generally a condenser used to introduce heat, which is then dissipated within the housing cavity of the casing 3. There are two main methods for heat exchanger 1 to introduce heat: one is to directly introduce heat using a thermally conductive conductor, such as a metal conductor, which transfers heat into the housing cavity and dissipates it there; the other is to use channels to introduce high-temperature refrigerant. These channels are coiled within the housing cavity and conduct heat with the gas inside through the channel walls. This allows the refrigerant to dissipate heat into the housing cavity as it flows into the channels. The refrigerant may or may not undergo a phase change, and the cooled refrigerant flows out of the housing cavity through the channels.

[0031] Fan 2 is used to blow liquid-containing air into heat exchanger 1. Fan 2 can be a humidifier, such as a centrifugal humidifier, or other types of humidifiers. For example, a water film can be installed at the air inlet of fan 2 so that the liquid in the water film is dispersed as the air passes through, causing a large number of liquid particles to be entrained in the air, thus forming liquid-containing air. Of course, the liquid here is not limited to water; it can also be other liquids capable of evaporating and dissipating heat. Liquid-containing air refers to an air with a significantly increased content of liquid particles, visible to the naked eye, generally appearing as mist or water droplets.

[0032] On the air inlet side of the heat exchanger 1, multiple fans 2 are arranged side-by-side in a direction perpendicular to the air inlet direction. It should be noted that these fans can be aligned or staggered in the air inlet direction. That is, multiple fans 2 are arranged side-by-side in the transverse direction of their blowing direction, allowing them to blow air into the heat exchanger 1 in a parallel manner. Unlike a single fan 2, multiple fans 2 can more effectively reduce the boundary clearance area. The blowing directions of each fan 2 can be completely parallel to each other; alternatively, some or all of the fans 2 can be inclined to form an angle between their axes, rather than simply being horizontally aligned. The specific air outlet directions of each fan 2 can be set as needed. For example, when multiple fans 2 are arranged, the outlet of the central fan faces the heat exchanger 1, while the outlets of the edge fans surrounding the central fan are deflected towards the center, inclined inwards, and not completely facing the heat exchanger 1. The air inlet direction can be the airflow direction of the heat exchanger 1 or the air outlet direction of the fan 2. The parallel arrangement can be aligned or staggered in the air inlet direction. The staggered arrangement is such as front and back arrangement. The aligned arrangement is preferred here.

[0033] In a plurality of horizontally arranged fans 2, at least two fans 2 can be turned on and off independently, so that some fans 2 or all fans 2 can be turned on. Of course, each fan 2 can be turned on and off independently, that is, the turning on or off of each fan 2 does not affect each other.

[0034] In this evaporative heat exchanger, when it is necessary to reduce the heat exchange efficiency of heat exchanger 1, some of the fans 2 are turned off, while the remaining fans 2 remain on. This reduces the incoming airflow and changes the liquid content entering heat exchanger 1, thereby adjusting the heat exchange efficiency of heat exchanger 1. Simultaneously, because the airflow of the fans 2 remains unchanged, the characteristics of the humidified air discharged by the fans 2 are not altered, and the path of liquid particles is not reduced. This effectively ensures the cooling effect of the fans 2, making the cooling effect more stable. Furthermore, the efficient utilization of the airflow and liquid particles by the fans 2 ensures full energy utilization. In summary, this evaporative heat exchanger effectively solves the problem of energy waste when adjusting the heat dissipation efficiency of current evaporative heat exchangers.

[0035] In some embodiments, considering that in practical applications, the diffusion range of the air blown out by the fan 2 may change due to factors such as water quality and ambient wind pressure. In such cases, the distance between adjacent fans 2 may increase, or some air from the edge fans 2 may not be directed towards the heat exchanger 1. Therefore, it is preferable that at least one of the fan 2's outlet air direction is adjustable to adjust the outlet air direction according to actual conditions, so that the air is more concentrated and directed towards the heat exchanger 1, thereby ensuring the heat exchange efficiency of the heat exchanger 1.

[0036] Specifically, the airflow direction of the edge fan 2 can be adjusted so that when opening or closing some fans 2, the middle fan 2 can be opened first.

[0037] As attached Figure 2 As shown, when two fans 2 are arranged side-by-side in one direction, one fan 2 can be positioned relative to the center of the heat exchanger 1, making it a central fan and the other a deflector fan. The outlet of the central fan faces the heat exchanger 1, while the deflector fan is angled and positioned towards the central fan. In this configuration, the airflow from the two deflector fans and the central fan can intersect at the heat exchanger 1. Preferably, the central fan is positioned towards the high-heat side of the heat exchanger 1.

[0038] When setting up the above-mentioned center fan 2 and offset fan 2, if only some of the fans 2 are turned on, the center fan 2 can be turned on while the offset fan 2 is turned off. As needed, the airflow angle of the offset fan 2 can be adjusted to ensure that even if the offset fan 2 is set at an angle, the outflowing air can be concentrated and guided to the heat exchanger 1.

[0039] The adjustable fan 2 can be driven by a drive unit or manually adjusted. Adjusting the angle between the two structures can be done using existing technology, such as a rotating connection and locking with screws.

[0040] In some embodiments, a rotation drive device is preferably included, wherein the rotation drive device is capable of driving the movement of at least one of the fans 2 to continuously change the air outlet direction of the fans 2. This allows the airflow range of the fans 2 to be expanded by rotating the drive device when the fans 2 are turned on alone, so as to ensure that the heat exchanger 1 receives liquid-containing air as evenly as possible.

[0041] It should be noted that the movement of the fan 2 can be either oscillation or rotation. Oscillation occurs when the fan 2 rotates around a straight line perpendicular to its axis, causing the air outlet of the fan 2 to oscillate. Rotation occurs when the fan 2 rotates around a straight line intersecting its axis, causing the axis of the fan 2 to rotate circumferentially along a cone. The rotation drive can be either an oscillation drive or a continuous rotation drive.

[0042] In some embodiments, a plurality of fans 2 are specifically provided, such as two fans 2, three fans 2, four fans 2, five fans 2 or more fans 2.

[0043] When only two fans 2 are set, the two fans 2 are arranged side by side. One fan 2 can be the aforementioned center fan, and the other fan 2 can be the offset fan. The rotation drive device can be an oscillating drive device to drive the offset fan 2 to oscillate.

[0044] As attached Figure 3 As shown, when only four fans 2 are set, the four fans 2 can be distributed in a square, that is, the lines connecting the axes of the four fans 2 form a square.

[0045] As attached Figure 4 As shown, when only five fans 2 are set up, four of the fans 2 are arranged in a rectangular shape, that is, the axis of the four fans 2 is connected to form a rectangle, and the other fan 2 is located between the above four fans 2, and the distance between it and the four outer fans 2 is equal.

[0046] In some embodiments, the air outlets of each of the fans 2 can be arranged facing upwards to better control the flow of liquid particles. In this case, each fan 2 is located below the heat exchanger 1. Alternatively, each fan 2 can be located above the heat exchanger 1, in which case its air outlet faces downwards. Alternatively, each fan 2 can be located on one side of the heat exchanger 1 in the horizontal direction, in which case its air outlet faces laterally. If all fans are arranged upwards, the axis of the fan 2 that is slightly off-center can be vertical, while the axis of the fan 2 that is slightly off-center can be tilted.

[0047] In some embodiments, considering that the duration of individual operation of a portion of the fans 2 is not too short over the entire service life, if a specific fan 2 is always operated when a portion of the fans 2 is operated, then the service life of that fan 2, as well as the service life of the area of ​​the heat exchanger 1 corresponding to that fan 2, will be significantly shortened. Therefore, it is preferable to further include a controller, which controls a storage device to record the operating duration of each of the fans 2, and upon receiving a start-up command for a portion of the fans 2, controls the operation of one or more of the fans 2 with the shorter total operating duration. In this case, each fan 2 can operate without changing its airflow direction, i.e., it is not driven by the aforementioned rotation drive device, and each fan 2 has a fixed corresponding area on the heat exchanger 1.

[0048] By using a controller, the operating time of each fan 2 can be made more uniform, allowing the fans 2 to start in turn. Correspondingly, it may also cause different areas of the heat exchanger 1 to start working in turn. This will make the service life of each part more consistent, thereby improving the overall service life.

[0049] It should be noted that, considering the continuous operation of the evaporative heat exchanger from startup, meaning some fans 2 may operate for extended periods, if the currently running fan 2 exceeds a predetermined duration compared to other fans 2, a fan 2 with a shorter running time can be selected for startup, and the currently running fan 2 can be shut down. It should be noted that the running time refers to the total running time of fan 2 from its initial use in the evaporative heat exchanger, i.e., the sum of all running times.

[0050] In some embodiments, a temperature detector is also included for detecting the temperature of the heat exchanger 1. When the temperature detector detects a value within a preset range, it can send a start command for the partial fan 2 to the controller.

[0051] Specifically, when the temperature detector value is lower than the first preset value, the controller shuts down each fan 2.

[0052] When the temperature detector detects a value that is not lower than the first preset value and is lower than the second preset value, the controller controls one or more fans 2 to turn on, but the liquid supply device that supplies liquid to the fans 2 remains closed.

[0053] When the temperature detector value is not lower than the third preset value and is lower than the fourth preset value, the controller controls the fan 2 to start, and the corresponding liquid supply device in the fan 2 that is started is turned on.

[0054] When the temperature detector value is not lower than the fourth preset value, the controller controls all fans 2 to start, and the corresponding liquid supply device of the fan 2 that is started is turned on.

[0055] The first preset value is less than the second preset value, and the third preset value is less than the fourth preset value. The third preset value can be equal to the second preset value, or it can be less than or greater than the second preset value, such as being between the first and second preset values.

[0056] Specifically, the first to fourth preset values ​​can be set according to the actual heat exchange requirements of heat exchanger 1, so that the heat exchange efficiency of heat exchanger 1 can be adjusted according to the heat source. The heat source inlet and / or outlet of heat exchanger 1 are equipped with the aforementioned temperature detectors, or the aforementioned temperature detectors can also be located at the heat source.

[0057] As attached Figure 5As shown, based on the evaporative heat exchanger provided in the above embodiments, the present invention also provides a heat exchange method for an evaporative heat exchanger, which includes the following steps: Step S10, obtaining the temperature at heat exchanger 1; Step S20, selecting and turning on a corresponding number of humidifying fans 2 on the air inlet side of heat exchanger 1 according to the temperature at heat exchanger 1. Since this evaporative heat exchange method uses the same heat exchange method as the evaporative heat exchanger in the above embodiments, the beneficial effects of this evaporative heat exchange method can be found in the above embodiments.

[0058] It should be noted that the humidifying fan 2, which is not turned on in step S20, can remain in the same position, i.e., facing the heat exchanger 1, or it can be removed. The humidifying fan 2 is the aforementioned fan 2 that can blow out liquid-containing air, such as a centrifugal fan 2.

[0059] Furthermore, step S20 can be specifically described as follows:

[0060] Based on the temperature at the heat exchanger 1, select the corresponding number of fans to be turned on on the air inlet side of the heat exchanger 1, and when selecting some fans 2 to be turned on, select the fans with the shorter operating time among the fans.

[0061] At this time, multiple fans 2 can be arranged side by side on the air inlet side of the heat exchanger 1 in a direction perpendicular to the air inlet direction, and each fan 2 does not move out when it is turned off, so as to keep its position unchanged.

[0062] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0063] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An evaporative heat exchange device, comprising a heat exchanger and a fan capable of blowing out liquid-containing air, characterized in that, On the air inlet side of the heat exchanger, multiple fans are arranged side by side in a direction perpendicular to the air inlet direction, and at least two of the fans can be turned on and off independently. Of the two fans arranged side-by-side in one direction: one fan is a center-biased fan, and the other fan is a deflection fan. The center-biased fan is positioned closer to the center of the heat exchanger than the deflection fan. The outlet of the center-biased fan is directly opposite the heat exchanger. The deflection fan is tilted and biased towards the center-biased fan. The airflow from the deflection fan and the center-biased fan can intersect at the heat exchanger. The tilt angle of the deflection fan is adjustable.

2. The evaporative heat exchanger according to claim 1, characterized in that, At least one of the fan's outlet air direction can be adjusted.

3. The evaporative heat exchanger according to claim 1, characterized in that, It also includes a rotation drive device, which is capable of driving the movement of at least one of the fans to continuously change the air outlet direction of the fans.

4. The evaporative heat exchanger according to claim 1, characterized in that, The four fans are arranged in a square or rectangular configuration, with another fan located at the center between them.

5. The evaporative heat exchanger according to claim 4, characterized in that, The fan is a centrifugal humidifier.

6. The evaporative heat exchanger according to claim 5, characterized in that, The air outlet of each of the aforementioned fans is set facing upwards.

7. The evaporative heat exchanger according to any one of claims 1-6, characterized in that, It also includes a controller, which controls the storage to record the operating time of each of the fans, and when it receives a start-up command for some of the fans, controls the fans with the shorter total operating time to start up.

8. The evaporative heat exchanger according to claim 7, characterized in that, It also includes a temperature detector for detecting the temperature of the heat exchanger, which can send a start command for part of the fan to the controller when the detected value is within a preset range.

9. The evaporative heat exchanger according to claim 8, characterized in that, The heat source inlet of the heat exchanger is equipped with the temperature detector.

10. A heat exchange method for an evaporative heat exchanger, characterized in that, The application of the evaporative heat exchanger according to any one of claims 1-9 includes the following steps: Obtain the temperature at the heat exchanger; Based on the temperature at the heat exchanger, select the appropriate number of humidifying fans to turn on on the air inlet side of the heat exchanger.

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