Evaporative refrigeration system and refrigeration control method

Abstract

The application discloses an evaporative refrigeration system, comprising: a first condenser and a second condenser arranged on a refrigeration cycle pipeline, one of the first condenser and the second condenser is an evaporative condenser, and the other is an air-cooled condenser; an air duct assembly comprising a first air duct, a second air duct and a third air duct; in a first working state of a control valve assembly, the first air duct and the second air duct are not communicated, external air flowing into the first air duct is output from a first outlet of the first air duct after radiating heat of the first condenser, and external air flowing into the second air duct is output from a second outlet of the second air duct after radiating heat of the second condenser; in a second working state of the control valve assembly, the first air duct and the second air duct are communicated, a first inlet is closed, after external air is introduced into the second air duct, the external air flowing into the second air duct radiates heat of the second condenser and then flows into the first air duct, and the external air in the first air duct radiates heat of the first condenser and is then output from the first outlet.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and in particular to an evaporative refrigeration system and a refrigeration control method. Background Technology

[0002] Evaporative refrigeration systems, also known as refrigeration systems including evaporative condensers, utilize the heat absorbed by the high-temperature gaseous refrigerant inside the coil as sprayed water evaporates. This process gradually cools the refrigerant from a gaseous state to a liquid state. Some evaporative refrigeration systems only have a cooling function, while others, such as evaporative heat pump systems, also have a heating function. For evaporative refrigeration systems that combine evaporative condensers and air-cooled condensers, improving overall energy efficiency is a worthwhile research topic. Summary of the Invention

[0003] The purpose of this invention is to provide an evaporative refrigeration system with multiple condenser heat dissipation modes and more energy-efficient operation, as well as a refrigeration control method using the evaporative refrigeration system.

[0004] The first aspect of this invention discloses an evaporative refrigeration system, comprising:

[0005] A refrigeration cycle device includes a refrigeration cycle pipeline and a condenser assembly. The condenser assembly includes a first condenser and a second condenser disposed on the refrigeration cycle pipeline. One of the first condenser and the second condenser is an evaporative condenser, and the other is an air-cooled condenser.

[0006] A heat exchange device includes a duct assembly, a fan assembly, and a control valve assembly. The duct assembly includes a first duct for a first condenser, a second duct for a second condenser, and a third duct connecting the first duct and the second duct. The fan assembly is used to introduce outside air into the first duct and / or the second duct. The control valve assembly includes a plurality of on / off valves disposed in the duct assembly.

[0007] The control valve assembly has a switchable first operating state and a second operating state. In the first operating state, the first air duct and the second air duct are not connected. External air flowing into the first air duct from the first inlet dissipates heat from the first condenser and is then output from the first outlet of the first air duct. External air flowing into the second air duct from the second inlet dissipates heat from the second condenser and is then output from the second outlet of the second air duct. In the second operating state, the first air duct and the second air duct are connected. The first inlet is closed. External air is introduced into the second air duct from the second inlet. The external air entering the second air duct dissipates heat from the second condenser and then flows into the first air duct. It dissipates heat from the first condenser in the first air duct and is then output from the first outlet.

[0008] In some embodiments, the control valve assembly also has a switchable third operating state. In the third operating state, the first air duct and the second air duct are connected, the second inlet is closed, and after the outside air is introduced into the first air duct from the first inlet, the outside air entering the first air duct dissipates heat on the first condenser and then flows into the second air duct, and after dissipating heat on the second condenser in the second air duct, it is output from the second outlet.

[0009] In some embodiments, the first air duct includes a first cavity surrounding the first condenser and a first pipe communicating with the first cavity, the first inlet communicating with the first cavity and the first outlet disposed on the first pipe; the second air duct includes a second cavity surrounding the second condenser and a second pipe communicating with the second cavity, the second inlet communicating with the second cavity and the second outlet disposed on the second pipe; the third air duct includes a first sub-pipe, a second sub-pipe, a third sub-pipe, and a fourth sub-pipe communicating with the first pipe, the second pipe, the first cavity, and the second cavity respectively; the third air duct further includes a fifth sub-pipe communicating with the first sub-pipe, the second sub-pipe, the third sub-pipe, and the fourth sub-pipe; in a first working state... External air flowing in from the first inlet flows into the first cavity and dissipates heat from the first condenser before flowing into the first pipe from the first cavity. External air flowing in from the second inlet flows into the second cavity and dissipates heat from the second condenser before flowing into the second pipe from the second cavity. The control valve assembly includes a first on / off valve for controlling the on / off of the first inlet, a second on / off valve for controlling the on / off of the second inlet, a third on / off valve for controlling the on / off of the first outlet, a fourth on / off valve for controlling the on / off of the second outlet, a fifth on / off valve for controlling the on / off of the first sub-pipe, a sixth on / off valve for controlling the on / off of the second sub-pipe, a seventh on / off valve for controlling the on / off of the third sub-pipe, and an eighth on / off valve for controlling the on / off of the fourth sub-pipe.

[0010] In some embodiments, the system further includes a humidity detection device and a control device for detecting the humidity of the outside wind. The control device is signal-connected to the humidity detection device, the fan assembly, and the control valve assembly. The control device is configured to control the operation of the fan assembly and control the switching of the operating state of the control valve assembly based on the detection result of the humidity detection device.

[0011] In some embodiments, the fan assembly includes a first fan and a second fan respectively disposed in the first air duct and the second air duct.

[0012] In some embodiments, the evaporative refrigeration system is an evaporative heat pump system.

[0013] A second aspect of this invention discloses a refrigeration control method using any of the described evaporative refrigeration systems, comprising:

[0014] When the relative humidity of the outside wind is (a%, b%), the control valve assembly is switched to the second operating state, controlling the air duct assembly to introduce outside wind from the second inlet into the second air duct. The outside wind entering the second air duct dissipates heat from the second condenser before flowing into the first air duct, and dissipates heat from the first condenser in the first air duct before exiting from the first outlet. Where 0 <a<b<100。

[0015] In some embodiments, the first condenser is an air-cooled condenser, the second condenser is an evaporative condenser, and the control valve assembly further has a switchable third operating state. In the third operating state, the first air duct and the second air duct are connected, the second inlet is closed, and after introducing outside air from the first inlet into the first air duct, the outside air entering the first air duct dissipates heat from the first condenser and flows into the second air duct, and dissipates heat from the second condenser in the second air duct before being output from the second outlet. The refrigeration control method further includes:

[0016] When the relative humidity of the outside wind is (c%, d%), the control valve assembly is switched to the third operating state, controlling the air duct assembly to introduce outside wind from the second inlet into the second air duct. The outside wind entering the second air duct dissipates heat from the second condenser before flowing into the first air duct, and dissipates heat from the first condenser in the first air duct before exiting from the first outlet. Wherein, 0 <a<b<50<c<d<100。

[0017] In some embodiments, the first condenser is an air-cooled condenser, the second condenser is an evaporative condenser, and the refrigeration control method further includes:

[0018] When the relative humidity of the outside wind is (0, a%), the control valve assembly is switched to the first operating state, controlling the air duct assembly to introduce outside wind from the second inlet into the second air duct. The outside wind entering the second air duct dissipates heat from the second condenser and is then output from the second outlet of the second air duct. Where, 0 <a<50。

[0019] In some embodiments, the first condenser is an air-cooled condenser, the second condenser is an evaporative condenser, and the refrigeration control method further includes:

[0020] When the relative humidity of the outside wind is (d%, 100%), the control valve assembly is switched to the first operating state, controlling the air duct assembly to introduce outside wind from the first inlet into the first air duct, so that the outside wind entering the first air duct dissipates heat from the first condenser and is then output from the first outlet of the first air duct, wherein 50 <d<100。

[0021] In some embodiments, it also includes:

[0022] When the relative humidity of the outside wind is (b%, c%), the control valve assembly is switched to the first operating state, controlling the duct assembly to introduce outside wind into the first duct from the first inlet and into the second duct from the second inlet. The outside wind entering the first duct dissipates heat from the first condenser and is then output from the first outlet of the first duct. Additionally, the outside wind entering the first duct dissipates heat from the first condenser and is then output from the first outlet of the first duct. Where 0 <b<50<c<100。

[0023] In some embodiments, the first condenser is an air-cooled condenser, the second condenser is an evaporative condenser, and the refrigeration control method includes:

[0024] When the relative humidity of the outside wind is (0, 20%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the outside wind from the second inlet into the second air duct, so that the outside wind entering the second air duct dissipates heat on the second condenser and is output from the second outlet of the second air duct.

[0025] When the relative humidity of the outside wind is (20%, 40%), the control valve assembly is switched to the second working state, and the air duct assembly is controlled to introduce the outside wind from the second inlet into the second air duct, so that the outside wind entering the second air duct dissipates heat on the second condenser and then flows into the first air duct, and dissipates heat on the first condenser in the first air duct and then outputs from the first outlet.

[0026] When the relative humidity of the outside wind is (40%, 60%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the outside wind into the first air duct from the first inlet and to introduce the outside wind into the second air duct from the second inlet, so that the outside wind entering the first air duct dissipates heat from the first condenser and is output from the first outlet of the first air duct, and so that the outside wind entering the first air duct dissipates heat from the first condenser and is output from the first outlet of the first air duct;

[0027] When the relative humidity of the outside wind is (60%, 80%), the control valve assembly is switched to the third working state, and the air duct assembly is controlled to introduce the outside wind from the second inlet into the second air duct, so that the outside wind entering the second air duct dissipates heat on the second condenser and then flows into the first air duct, and dissipates heat on the first condenser in the first air duct and then outputs from the first outlet.

[0028] When the relative humidity of the outside wind is (80%, 100%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the outside wind from the first inlet into the first air duct, so that the outside wind entering the first air duct dissipates heat on the first condenser and is output from the first outlet of the first air duct.

[0029] Based on the evaporative refrigeration system provided by this invention, by setting up air duct components and control valve components, external air can be introduced to independently dissipate heat from the evaporative condenser and the air-cooled condenser. Alternatively, external air can be introduced to dissipate heat from one of the evaporative condensers and the air-cooled condenser before the heat-exchanged external air is introduced into the other condenser to exchange heat. This allows for multiple condenser heat dissipation modes, and a more energy-efficient condenser heat dissipation mode can be selected based on the air humidity.

[0030] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the structural principle of the evaporative refrigeration system in this embodiment of the present invention. Detailed Implementation

[0033] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] In the description of this invention, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0038] like Figure 1 As shown, the evaporative refrigeration system in this embodiment includes a refrigeration cycle device and a heat exchange device.

[0039] The refrigeration cycle device includes a refrigeration cycle pipeline 13 and a condenser assembly. The condenser assembly includes a first condenser 11 and a second condenser 12 disposed on the refrigeration cycle pipeline 13. One of the first condenser 11 and the second condenser 12 is an evaporative condenser, and the other is an air-cooled condenser.

[0040] As shown in the figure, the refrigeration cycle device also includes a compressor 15, an evaporator 14, and an expansion valve assembly 16 disposed on the refrigeration cycle pipeline. During refrigeration, the refrigerant flows within the refrigeration cycle pipeline 13. After the compressor compresses the refrigerant, it enters the first condenser 11 and the second condenser 12 for heat dissipation. Air-cooled condensers utilize a fan to directly dissipate heat through convection with the air. Evaporative condensers, as described in the background section, utilize water evaporation for heat dissipation. Outside air entering the evaporative condenser's duct mainly absorbs the latent heat from water evaporation, while water evaporation absorbs the sensible heat of the air. The evaporative refrigeration system of this embodiment includes both an evaporative condenser and an air-cooled condenser. In the embodiment shown, the evaporative condenser and the air-cooled condenser are connected in series in the refrigeration cycle pipeline. The heat dissipated by the evaporative condenser and the air-cooled condenser for cooling the refrigerant mainly comes from the phase change of the refrigerant.

[0041] The heat exchange device includes a duct assembly, a fan assembly, and a control valve assembly. The duct assembly includes a first duct 5 for a first condenser 11, a second duct 6 for a second condenser 12, and a third duct 4 connecting the first duct 5 and the second duct 6. The fan assembly is used to introduce outside air into the first duct 5 and / or the second duct 6. The control valve assembly includes a plurality of on / off valves disposed in the duct assembly.

[0042] The first air duct is used to guide the airflow for cooling the first condenser, and the second air duct is used to guide the airflow for cooling the second condenser. Outside air refers to air drawn from the external environment. The fan assembly can introduce outside air into the first air duct 5 and also into the second air duct 6. In some embodiments, outside air can be introduced into the first air duct 5 and the second air duct 6 simultaneously, or separately; for example, only outside air can be introduced into the first air duct 5, without introducing outside air into the second air duct 6. The fan assembly introduces outside air by suction or blowing.

[0043] The control valve assembly has a switchable first operating state and a second operating state. In the first operating state, the first air duct 5 and the second air duct 6 are not connected. External air flowing into the first air duct 5 through the first inlet dissipates heat from the first condenser 11 and is then output from the first outlet of the first air duct 5. External air flowing into the second air duct 6 through the second inlet dissipates heat from the second condenser 12 and is then output from the second outlet of the second air duct 6.

[0044] In other words, the outside air entering the first air duct 5 will not flow into the second air duct 6 before exiting from the first outlet of the first air duct 5. After exiting from the first outlet of the first air duct 5, the outside air entering the first air duct 5 will be directly output to the external environment or collected, without flowing into the second air duct 6. Similarly, the outside air entering the second air duct 6 will not flow into the first air duct 5 before exiting from the second outlet of the second air duct 6. After exiting from the second outlet of the second air duct 6, the outside air entering the second air duct 6 will be directly output to the external environment or collected, without flowing into the first air duct 5. In the first operating state, the control valve assembly can control the fan assembly to only introduce outside air into the first air duct 5 to dissipate heat from the first condenser and then directly discharge it to the external environment, or control it to only introduce outside air into the second air duct 6 to dissipate heat from the second condenser and then directly discharge it to the external environment. In some embodiments, it can also simultaneously control the introduction of outside air into both the first air duct 5 and the second air duct 6 to dissipate heat from the condensers in the air ducts, and then discharge the air directly to the external environment from the first and second air ducts respectively.

[0045] In the second working state, the first air duct 5 and the second air duct 6 are connected, the first inlet is closed, the outside air entering from the second inlet into the second air duct 6 dissipates heat on the second condenser 12 and then flows into the first air duct 5, and dissipates heat on the first condenser 11 in the first air duct 5 and then outputs from the first outlet.

[0046] When the first condenser 11 is an air-cooled condenser and the second condenser 12 is an evaporative condenser, with the control valve assembly in the second operating state, the outside air supplied by the fan assembly from the second inlet to the second air duct 6 first dissipates heat from the evaporative condenser within the second air duct. In the evaporative condenser, the outside air primarily absorbs heat from the latent heat generated by the water vapor evaporating from the spray water. The evaporation of water absorbs the sensible heat of the air. If the relative humidity of the outside air (i.e., the outside air) in the second air duct is low, the outside air will experience a rise in wet-bulb temperature and a decrease in dry-bulb temperature after passing through the evaporative condenser. Utilizing this low-dry-bulb outside air to re-enter the first air duct to dissipate heat from the air-cooled condenser achieves a better cooling effect than directly utilizing the outside air. In other words, a better cooling effect can be obtained through the second operating state even in environments with low relative humidity of the outside air.

[0047] When the first condenser 11 is an evaporative condenser and the second condenser 12 is an air-cooled condenser, with the control valve assembly in the second operating state, the outside air supplied by the fan assembly from the second inlet to the second air duct 6 first dissipates heat from the air-cooled condenser within the second air duct. In the air-cooled condenser, the dry-bulb temperature of the outside air rises, and the relative humidity decreases. If the relative humidity of the introduced outside air (i.e., ambient air) is high, the relative humidity can be significantly reduced by the air-cooled condenser, thus greatly increasing its ability to absorb water vapor. Utilizing this low-relative-humidity outside air to then enter the first air duct to dissipate heat from the evaporative condenser achieves a better cooling effect than directly using outside air to dissipate heat from the evaporative condenser. In other words, a better cooling effect can be obtained through the second operating state even in environments with high relative humidity of the outside air.

[0048] The evaporative refrigeration system of this embodiment, by setting up an air duct assembly and a control valve assembly, can switch to a first working state in which the outside air independently dissipates heat from the evaporative condenser and the air-cooled condenser. It can also switch to a second working state in which the outside air dissipates heat from one of the evaporative condensers and the air-cooled condenser, and then the heat-exchanged outside air is introduced into the other condenser for heat exchange. This allows for multiple condenser heat dissipation modes, and different working states can be selected according to the different humidity of the outside air, thereby selecting a more suitable, energy-efficient and effective condenser heat dissipation mode.

[0049] In some embodiments, the control valve assembly also has a switchable third operating state. In the third operating state, the first air duct 5 and the second air duct 6 are connected, the second inlet is closed, and after the outside air is introduced into the first air duct 5 from the first inlet, the outside air entering the first air duct 5 dissipates heat on the first condenser 11 and flows into the second air duct 6. After dissipating heat on the second condenser 12 in the second air duct 6, it is output from the second outlet.

[0050] In this embodiment, one of the first condenser 11 and the second condenser 12 is an evaporative condenser, and the other is an air-cooled condenser. By switching the control valve assembly between a second operating state and a third operating state, this embodiment can switch between two heat dissipation modes: one where outside air first enters the air duct to dissipate heat from the air-cooled condenser, and then enters another air duct to dissipate heat from the evaporative condenser; and another where outside air first enters the air duct to dissipate heat from the evaporative condenser, and then enters another air duct to dissipate heat from the air-cooled condenser. Thus, when the humidity of the outside air changes, the system can switch between the second and third operating states. For example, the second operating state is suitable for situations with high relative humidity. When the relative humidity of the outside air is low, the control valve assembly switches to the third operating state, allowing outside air to first enter the air duct to dissipate heat from the evaporative condenser, and then enter another air duct to dissipate heat from the air-cooled condenser. The control valve assembly in this embodiment has more operating states, which can better adapt to more situations such as high, relatively high, relatively low, and very low relative humidity of the outside wind. The evaporative refrigeration system can achieve good energy-saving and high-efficiency effects in more environments with different relative humidity of the outside wind.

[0051] In some embodiments, such as Figure 1As shown, the first air duct 5 includes a first cavity 51 surrounding the first condenser 11 and a first pipe 52 communicating with the first cavity 51. A first inlet communicates with the first cavity 51, and a first outlet is located on the first pipe 52. In the embodiment shown, the first inlet is located on the outer shell of the first cavity 51, and the first outlet is located at the end of the first pipe 52 away from the position where the first pipe 52 communicates with the first cavity 51. The second air duct 6 includes a second cavity 61 surrounding the second condenser 12 and a second pipe 62 communicating with the second cavity 61. A second inlet communicates with the second cavity 61, and a second outlet is located on the second pipe 62. In the embodiment shown, the second inlet is located on the outer shell of the second cavity 61, and the second outlet is located at the end of the second pipe 62 away from the position where the first pipe 62 communicates with the second cavity 61. The third air duct 4 includes a first sub-duct 41, a second sub-duct 42, a third sub-duct 43, and a fourth sub-duct 44, which are respectively connected to the first duct 52, the second duct 62, the first cavity 51, and the second cavity 61. The third air duct 4 also includes a fifth sub-duct 45 that simultaneously connects to the first sub-duct 41, the second sub-duct 42, the third sub-duct 43, and the fourth sub-duct 44. In the first operating state, external air flowing in from the first inlet flows into the first cavity 51 and dissipates heat from the first condenser 11 before flowing into the first duct 52 from the first cavity 51. External air flowing in from the second inlet flows into the second cavity 61 and dissipates heat from the second condenser 12 before flowing into the second duct 62 from the second cavity 61. The control valve assembly includes a first on / off valve 31 for controlling the on / off of a first inlet, a second on / off valve 32 for controlling the on / off of a second inlet, a third on / off valve 33 for controlling the on / off of a first outlet, a fourth on / off valve 34 for controlling the on / off of a second outlet, a fifth on / off valve 35 for controlling the on / off of a first sub-pipeline 41, a sixth on / off valve 36 for controlling the on / off of a second sub-pipeline 42, a seventh on / off valve 37 for controlling the on / off of a third sub-pipeline 43, and an eighth on / off valve 38 for controlling the on / off of a fourth sub-pipeline 44. The first on / off valve 31, second on / off valve 32, third on / off valve 33, fourth on / off valve 34, fifth on / off valve 35, sixth on / off valve 36, seventh on / off valve 37, and eighth on / off valve 38 are either on / off valves or throttle valves with adjustable flow area. The opening or closing of the first shut-off valve 31 can control the opening or closing of the first inlet; the opening or closing of the second shut-off valve 32 can control the opening or closing of the second inlet; the opening or closing of the third shut-off valve 33 can control the opening or closing of the first outlet; the opening or closing of the fourth shut-off valve 34 can control the opening or closing of the second outlet; the opening or closing of the fifth shut-off valve 35 can control the opening or closing of the first sub-pipe 41; the opening or closing of the sixth shut-off valve 36 can control the opening or closing of the second sub-pipe 42; the opening or closing of the seventh shut-off valve 37 can control the opening or closing of the third sub-pipe 43; and the opening or closing of the eighth shut-off valve 38 can control the opening or closing of the fourth sub-pipe 44.

[0052] The control valve assembly can be switched to the first operating state by opening the first on / off valve 31, the second on / off valve 32, the third on / off valve 33, the fourth on / off valve 34, closing the fifth on / off valve 35, closing the sixth on / off valve 36, closing the seventh on / off valve 37, and closing the eighth on / off valve 38. The control valve assembly can be switched to the second operating state by closing the first on / off valve 31, opening the second on / off valve 32, opening the third on / off valve 33, closing the fourth on / off valve 34, closing the fifth on / off valve 35, opening the sixth on / off valve 36, opening the seventh on / off valve 37, and closing the eighth on / off valve 38. The control valve assembly can be switched to the third operating state by opening the first on / off valve 31, closing the second on / off valve 32, closing the third on / off valve 33, opening the fourth on / off valve 34, opening the fifth on / off valve 35, closing the sixth on / off valve 36, closing the seventh on / off valve 37, and closing the eighth on / off valve 38. This embodiment, through the arrangement of the first pipe 52, the second pipe 62, the aforementioned multiple sub-pipes, and multiple on / off valves, can conveniently and effectively realize multiple operating states of the control valve assembly and achieve multiple condenser heat dissipation modes. In some embodiments, the arrangement of the duct assembly, fan assembly, and control valve assembly is not limited to the above-described manner. For example, the duct assembly can also be equipped with more pipes and on / off valves. For a heat dissipation mode in which outside air first enters the duct to dissipate heat from the air-cooled condenser, and then enters another duct to dissipate heat from the evaporative condenser, a dedicated pipe is set up to connect the output end of the air-cooled condenser and the input end of the evaporative condenser, and a dedicated on / off valve is set up in the pipe to control the opening or closing of the pipe. For a heat dissipation mode in which outside air first enters the duct to dissipate heat from the evaporative condenser, and then enters another duct to dissipate heat from the air-cooled condenser, a dedicated pipe is set up to connect the input end of the air-cooled condenser and the output end of the evaporative condenser, and a dedicated on / off valve is set up in the pipe to control the opening or closing of the pipe. For air-cooled condensers operating independently, a dedicated pipe is installed connecting to the output of the air-cooled condenser, and an on / off valve is installed in this pipe. Similarly, for evaporative condensers operating independently, a dedicated pipe is installed connecting to the output of the evaporative condenser, and an on / off valve is installed in this pipe. When different cooling modes are activated, the corresponding dedicated pipe is opened, and the others are closed. Regarding the fan assembly, two fans can be installed inside the pipe as shown in the diagram, or the fans can be placed outside the pipe, drawing air into the pipe via blowing or suction.

[0053] In some embodiments, the system further includes a ninth shut-off valve 391 disposed in the first pipeline for controlling the on / off state of the first pipeline, a tenth shut-off valve 392 disposed in the second pipeline for controlling the on / off state of the second pipeline, and an eleventh shut-off valve 393 disposed in the fifth sub-pipeline for controlling the on / off state of the fifth sub-pipeline.

[0054] In some embodiments, the evaporative refrigeration system further includes a humidity detection device and a control device for detecting the humidity of the outside wind. The control device is signal-connected to the humidity detection device, the fan assembly, and the control valve assembly. The control device is configured to control the operation of the fan assembly and control the switching of the operating state of the control valve assembly based on the detection result of the humidity detection device. In this embodiment, by detecting the humidity of the outside wind, the relative humidity of the outside wind can be obtained. The control device can automatically control the control valve assembly to switch to a suitable operating state and control the fan assembly to perform matching operation, thereby automatically switching to a matching and efficient condenser heat dissipation mode according to different relative humidity of the outside wind.

[0055] In some embodiments, as shown in the figure, the fan assembly includes a first fan and a second fan respectively disposed in a first air duct 5 and a second air duct 6. In the embodiment shown in the figure, the first fan and the second fan are axial flow fans. The first fan is used to introduce outside air into the first air duct, and the second fan is used to introduce outside air into the second air duct. By setting the first fan and the second fan, the introduction of outside air into the first air duct and the second air duct can be independently and flexibly controlled, thereby realizing multiple condenser heat dissipation modes.

[0056] In some embodiments, the evaporative refrigeration system is an evaporative heat pump system. In the embodiment shown, the compressor is connected to the evaporator and condenser assembly via a four-way valve. During heating, the air-cooled condenser starts operating, while the evaporative condenser does not. This embodiment can achieve both cooling and heating, enabling more functions.

[0057] In some embodiments, a refrigeration control method applying any of the above-described evaporative refrigeration systems is also disclosed, including:

[0058] When the relative humidity of the external wind is (a%, b%), the control valve assembly is switched to the second working state, and the air duct assembly is controlled to introduce the external wind from the second inlet into the second air duct 6. The external wind entering the second air duct 6 cools the second condenser 12 and then flows into the first air duct 5, and after cooling the first condenser 11 in the first air duct 5, it is output from the first outlet, where 0 < a < b < 100. When the first condenser 11 is an air-cooled condenser and the second condenser 12 is an evaporative condenser, the relative humidity of the external wind is (a%, b%) and b < 50. When the control valve assembly is in the second working state and the fan assembly introduces the external wind from the second inlet into the second air duct 6, the external wind first cools the evaporative condenser in the second air duct. In the evaporative condenser, the main heat absorption comes from the latent heat absorbed by the water vapor evaporated from the sprayed water of the evaporative condenser, and the evaporation of water absorbs the sensible heat of the air. If the relative humidity of the introduced external wind (i.e., external air) is relatively low, the wet bulb temperature of the external wind will rise and the dry bulb temperature will decrease after passing through the evaporative condenser. Using this low dry bulb temperature external wind to enter the first air duct to cool the air-cooled condenser can obtain a better cooling effect than directly using the external wind to cool the air-cooled condenser. This embodiment can obtain a better cooling effect in an environment with a relatively low relative humidity of the external wind, and is more energy-saving and efficient. When the first condenser 11 is an evaporative condenser and the second condenser 12 is an air-cooled condenser, the relative humidity of the external wind is (a%, b%) and a > 50. When the control valve assembly is in the second working state and the fan assembly introduces the external wind from the second inlet into the second air duct 6, the external wind first cools the air-cooled condenser in the second air duct. In the air-cooled condenser, the dry bulb temperature will rise and the relative humidity will decrease. If the relative humidity of the introduced external wind (i.e., external air) is relatively high, the relative humidity of the external wind can be significantly reduced after passing through the air-cooled condenser, so the ability to absorb water vapor increases significantly. At this time, using this low relative humidity external wind to enter the first air duct to cool the evaporative condenser can obtain a better cooling effect than directly using the external wind to cool the evaporative condenser. This embodiment can obtain a better cooling effect in an environment with a relatively high relative humidity of the external wind, and is more energy-saving and efficient.

[0059] In some embodiments, the first condenser 11 is an air-cooled condenser, the second condenser 12 is an evaporative condenser, and the control valve assembly further has a switchable third working state. In the third working state, the first air duct 5 and the second air duct 6 are connected, the second inlet is closed, and after introducing the external wind from the first inlet into the first air duct 5, the external wind entering the first air duct 5 cools the first condenser 11 and then flows into the second air duct 6, and after cooling the second condenser 12 in the second air duct June 6, it is output from the second outlet. The refrigeration control method further includes:

[0060] When the relative humidity of the external wind is (c%, d%), the control valve assembly is switched to the third working state, and the air duct assembly is controlled to introduce the external wind from the second inlet into the second air duct 6, so that the external wind entering the second air duct 6 cools the second condenser 12 and then flows into the first air duct 5, and after cooling the first condenser 11 in the first air duct 5, it is output from the first outlet, where 0 < a < b < 50 < c < d < 100. In this embodiment, different heat dissipation modes of the condensers can be realized by switching the state of the control valve assembly in an environment with a relatively low relative humidity of the external wind and in an environment with a relatively high relative humidity of the external wind, so as to perform more energy-saving and efficient heat dissipation.

[0061] In some embodiments, the first condenser 11 is an air-cooled condenser, the second condenser 12 is an evaporative condenser, and the refrigeration control method further includes:

[0062] When the relative humidity of the external wind is (0, a%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the external wind from the second inlet into the second air duct 6, so that the external wind entering the second air duct 6 cools the second condenser 12 and then is output from the second outlet of the second air duct 6, where 0 < a < 50. At this time, both the first inlet and the first outlet are closed, and the fan assembly does not introduce external wind into the first air duct 5, and only the evaporative condenser is used for heat dissipation work. When the relative humidity of the external wind is very low, the ratio of the heat dissipation amount of the evaporative condenser to the total heat dissipation amount will be very high, and the air-cooled condenser can be selected to be closed at this time to save the electric energy consumed by electrical components such as fans, thereby improving the overall energy efficiency. This embodiment can perform more efficient and energy-saving heat dissipation of the condenser in an environment with a very low relative humidity of the external wind.

[0063] In some embodiments, the first condenser 11 is an air-cooled condenser, the second condenser 12 is an evaporative condenser, and the refrigeration control method further includes:

[0064] When the relative humidity of the external wind is (d%, 100%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the external wind from the first inlet into the first air duct 5, so that the external wind entering the first air duct 5 cools the first condenser 11 and then is output from the first outlet of the first air duct 5, where 50 < d < 100. At this time, both the second inlet and the second outlet are closed, and the fan assembly does not introduce external wind into the second air duct 6, and only the air-cooled condenser is used for heat dissipation work. When the relative humidity of the external wind is very high, the ratio of the heat dissipation amount of the evaporative condenser to the total heat dissipation amount will be very low. At this time, the evaporative condenser can be closed, and the air-cooled condenser is used for separate heat dissipation to save the electric energy consumed by electrical components such as fans and water pumps, and improve the overall energy efficiency. This embodiment can perform more efficient and energy-saving heat dissipation of the condenser in an environment with a very high relative humidity of the external wind.

[0065] In some embodiments, it further includes:

[0066] When the relative humidity of the external wind is (b%, c%), switch the control valve assembly to the first working state, control the air duct assembly to introduce the external wind from the first inlet into the first air duct 5 and introduce the external wind from the second inlet into the second air duct 6, so that the external wind entering the first air duct 5 cools the first condenser 11 and then is output from the first outlet of the first air duct 5, and the external wind entering the first air duct 5 cools the first condenser 11 and then is output from the first outlet of the first air duct 5, where 0 < b < 50 < c < 100. When the relative humidity of the external wind is about 50%, at this time, the first air duct and the second air duct are simultaneously introduced with the external wind for operation, and the heat dissipation ratio of the evaporative condenser to the air-cooled condenser is quite the same. At this time, the external wind can cool the evaporative condenser and the air-cooled condenser respectively and simultaneously, maximizing the use of the heat exchange area of the radiator.

[0067] In some embodiments, the first condenser 11 is an air-cooled condenser, the second condenser 12 is an evaporative condenser, and the refrigeration control method includes:

[0068] When the relative humidity of the external wind is (0, 20%), switch the control valve assembly to the first working state, control the air duct assembly to introduce the external wind from the second inlet into the second air duct 6, so that the external wind entering the second air duct 6 cools the second condenser 12 and then is output from the second outlet of the second air duct 6;

[0069] When the relative humidity of the external wind is (20%, 40%), switch the control valve assembly to the second working state, control the air duct assembly to introduce the external wind from the second inlet into the second air duct 6, so that the external wind entering the second air duct 6 cools the second condenser 12 and then flows into the first air duct 5, and cools the first condenser 11 in the first air duct 5 and then is output from the first outlet;

[0070] When the relative humidity of the external wind is (40%, 60%), switch the control valve assembly to the first working state, control the air duct assembly to introduce the external wind from the first inlet into the first air duct 5 and introduce the external wind from the second inlet into the second air duct 6, so that the external wind entering the first air duct 5 cools the first condenser 11 and then is output from the first outlet of the first air duct 5, and the external wind entering the first air duct 5 cools the first condenser 11 and then is output from the first outlet of the first air duct 5;

[0071] When the relative humidity of the external wind is (60%, 80%), switch the control valve assembly to the third working state, control the air duct assembly to introduce the external wind from the second inlet into the second air duct 6, so that the external wind entering the second air duct 6 cools the second condenser 12 and then flows into the first air duct 5, and cools the first condenser 11 in the first air duct 5 and then is output from the first outlet;

[0072] When the relative humidity of the outside wind is (80%, 100%), the control valve assembly is switched to the first operating state, and the control air duct assembly introduces the outside wind into the first air duct 5 from the first inlet. The outside wind entering the first air duct 5 dissipates heat from the first condenser 11 and is then output from the first outlet of the first air duct 5. The evaporative refrigeration system of this embodiment can select a suitable condenser heat dissipation mode under different relative humidity of the outside wind, making it more energy-efficient and effective.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. An evaporative refrigeration system characterized by, The application relates to a refrigeration cycle device and a heat exchange device. The refrigeration cycle device comprises a refrigeration cycle pipeline (13) and a condenser assembly, the condenser assembly comprises a first condenser (11) and a second condenser (12) arranged on the refrigeration cycle pipeline (13), one of the first condenser (11) and the second condenser (12) is an evaporative condenser, and the other is an air-cooled condenser. The heat exchange device comprises an air duct assembly, a fan assembly and a control valve assembly, the air duct assembly comprises a first air duct (5) for the first condenser (11), a second air duct (6) for the second condenser (12) and a third air duct (4) connecting the first air duct (5) and the second air duct (6), the fan assembly is used for introducing external air into the first air duct (5) and / or the second air duct (6), and the control valve assembly comprises a plurality of on-off valves arranged in the air duct assembly. The control valve assembly has switchable first and second working states, in the first working state, the first air duct (5) and the second air duct (6) are not communicated, external air flowing into the first air duct (5) through a first inlet of the first air duct (5) is output from a first outlet of the first air duct (5) after radiating heat of the first condenser (11), and external air flowing into the second air duct (6) through a second inlet of the second air duct (6) is output from a second outlet of the second air duct (6) after radiating heat of the second condenser (12); in the second working state, the first air duct (5) and the second air duct (6) are communicated, the first inlet is closed, and external air introduced into the second air duct (6) from the second inlet is output from the first outlet after radiating heat of the first condenser (11) in the first air duct (5).

2. The evaporative refrigeration system of claim 1, wherein, The control valve assembly also has a switchable third working state, in the third working state, the first air duct (5) and the second air duct (6) are communicated, the second inlet is closed, and external air introduced into the first air duct (5) from the first inlet is output from the second outlet after radiating heat of the second condenser (12) in the second air duct (6).

3. The evaporative refrigeration system of claim 1, wherein, The first air duct (5) comprises a first cavity (51) surrounding the first condenser (11), a first pipeline (52) in communication with the first cavity (51), the first inlet is in communication with the first cavity (51), and the first outlet is arranged on the first pipeline (52); the second air duct (6) comprises a second cavity (61) surrounding the second condenser (12), a second pipeline (62) in communication with the second cavity (61), the second inlet is in communication with the second cavity (61), and the second outlet is arranged on the second pipeline (62); the third air duct (4) comprises a first sub-pipeline (41), a second sub-pipeline (42), a third sub-pipeline (43) and a fourth sub-pipeline (44) in communication with the first pipeline (52), the second pipeline (62), the first cavity (51) and the second cavity (61) respectively; the third air duct (4) further comprises a fifth sub-pipeline (45) in communication with the first sub-pipeline (41), the second sub-pipeline (42), the third sub-pipeline (43) and the fourth sub-pipeline (44); in the first working state, the external air flowing from the first inlet flows into the first cavity (51) and cools the first condenser (11), and then flows from the first cavity (51) into the first pipeline (52); the external air flowing from the second inlet flows into the second cavity (61) and cools the second condenser (12), and then flows from the second cavity (61) into the second pipeline (62); the control valve assembly comprises a first on-off valve (31) for controlling the on-off of the first inlet, a second on-off valve (32) for controlling the on-off of the second inlet, a third on-off valve (33) for controlling the on-off of the first outlet, a fourth on-off valve (34) for controlling the on-off of the second outlet, a fifth on-off valve (35) for controlling the on-off of the first sub-pipeline (41), a sixth on-off valve (36) for controlling the on-off of the second sub-pipeline (42), a seventh on-off valve (37) for controlling the on-off of the third sub-pipeline (43), and an eighth on-off valve (38) for controlling the on-off of the fourth sub-pipeline (44).

4. The evaporative refrigeration system of any one of claims 1 to 3, wherein, Further comprising a humidity detection device for detecting the humidity of the external air, and a control device, the control device is in signal connection with the humidity detection device, the fan assembly and the control valve assembly, and is configured to control the working of the fan assembly and the switching of the working state of the control valve assembly according to the detection result of the humidity detection device.

5. The evaporative refrigeration system of any one of claims 1 to 3, wherein, The fan assembly comprises a first fan (171) and a second fan (172) arranged in the first air duct (5) and the second air duct (6) respectively.

6. The evaporative refrigeration system of any one of claims 1 to 3, wherein, The evaporative refrigeration system is an evaporative cooling and heating pump system.

7. A method of controlling the refrigeration of an evaporative refrigeration system according to any one of claims 1 to 6, characterized in that, Comprise: When the relative humidity of the ambient air is (a%, b%), the control valve assembly is switched to the second working state, the air duct assembly is controlled to introduce the ambient air into the second air duct (6) from the second inlet, the ambient air entering the second air duct (6) is cooled by the second condenser (12) and then flows into the first air duct (5), and the ambient air in the first air duct (5) is cooled by the first condenser (11) and then is output from the first outlet, wherein 0 8. The refrigeration control method of claim 7, wherein, The first condenser (11) is an air-cooled condenser, the second condenser (12) is an evaporative condenser, the control valve assembly further has a switchable third working state, in the third working state, the first air duct (5) and the second air duct (6) are communicated, the second inlet is closed, the ambient air is introduced into the first air duct (5) from the first inlet, the ambient air entering the first air duct (5) is cooled by the first condenser (11) and then flows into the second air duct (6), and the ambient air in the second air duct (6) is cooled by the second condenser (12) and then is output from the second outlet, and the refrigeration control method further comprises: When the relative humidity of the ambient air is (c%, d%), the control valve assembly is switched to the third working state, the air duct assembly is controlled to introduce the ambient air into the second air duct (6) from the second inlet, the ambient air entering the second air duct (6) is cooled by the second condenser (12) and then flows into the first air duct (5), and the ambient air in the first air duct (5) is cooled by the first condenser (11) and then is output from the first outlet, wherein 0 9. The refrigeration control method of claim 7, wherein, The first condenser (11) is an air-cooled condenser, the second condenser (12) is an evaporative condenser, and the refrigeration control method further comprises: When the relative humidity of the ambient air is (0, a%), the control valve assembly is switched to the first working state, the air duct assembly is controlled to introduce the ambient air into the second air duct (6) from the second inlet, and the ambient air entering the second air duct (6) is cooled by the second condenser (12) and then is output from the second outlet of the second air duct (6), wherein 0 10. The refrigeration control method of claim 7, wherein, The first condenser (11) is an air-cooled condenser, the second condenser (12) is an evaporative condenser, and the refrigeration control method further comprises: When the relative humidity of the ambient air is (d%, 100%), the control valve assembly is switched to the first working state, the air duct assembly is controlled to introduce the ambient air into the first air duct (5) from the first inlet, the ambient air entering the first air duct (5) is cooled by the first condenser (11) and then is output from the first outlet of the first air duct (5), wherein 50 11. The refrigeration control method of claim 7, wherein, Further comprising: When the relative humidity of the ambient air is (b%, c%), the control valve assembly is switched to the first working state, the air duct assembly is controlled to introduce the ambient air from the first inlet into the first air duct (5) and introduce the ambient air from the second inlet into the second air duct (6), the ambient air entering the first air duct (5) is cooled by the first condenser (11) and then output from the first outlet of the first air duct (5), and the ambient air entering the first air duct (5) is cooled by the first condenser (11) and then output from the first outlet of the first air duct (5), wherein 0 < b < 50 < c < 100.

12. The refrigeration control method of claim 7, wherein, The first condenser (11) is an air-cooled condenser, and the second condenser (12) is an evaporative condenser. The refrigeration control method comprises at least one of the following: When the relative humidity of the ambient air is (0, 20%), the control valve assembly is switched to the first working state, the air duct assembly is controlled to introduce the ambient air from the second inlet into the second air duct (6), the ambient air entering the second air duct (6) is cooled by the second condenser (12) and then output from the second outlet of the second air duct (6); When the relative humidity of the ambient air is (20%, 40%), the control valve assembly is switched to the second working state, the air duct assembly is controlled to introduce the ambient air from the second inlet into the second air duct (6), the ambient air entering the second air duct (6) is cooled by the second condenser (12) and then flows into the first air duct (5), and the ambient air is cooled by the first condenser (11) in the first air duct (5) and then output from the first outlet; When the relative humidity of the ambient air is (40%, 60%), the control valve assembly is switched to the first working state, the air duct assembly is controlled to introduce the ambient air from the first inlet into the first air duct (5) and introduce the ambient air from the second inlet into the second air duct (6), the ambient air entering the first air duct (5) is cooled by the first condenser (11) and then output from the first outlet of the first air duct (5), and the ambient air entering the first air duct (5) is cooled by the first condenser (11) and then output from the first outlet of the first air duct (5); When the relative humidity of the ambient air is (60%, 80%), the control valve assembly is switched to the third working state, the air duct assembly is controlled to introduce the ambient air from the second inlet into the second air duct (6), the ambient air entering the second air duct (6) is cooled by the second condenser (12) and then flows into the first air duct (5), and the ambient air is cooled by the first condenser (11) in the first air duct (5) and then output from the first outlet; When the relative humidity of the ambient air is (80%, 100%), the control valve assembly is switched to the first working state, the air duct assembly is controlled to introduce the ambient air from the first inlet into the first air duct (5), the ambient air entering the first air duct (5) is cooled by the first condenser (11) and then output from the first outlet of the first air duct (5).

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