Evaporative refrigeration system and refrigeration control method

Abstract

The invention discloses an evaporation refrigeration system which comprises a first condenser and a second condenser which are arranged on a refrigeration circulation pipeline, one of the first condenser and the second condenser is an evaporation type condenser, and the other of the first condenser and the second condenser is an air-cooled type condenser. The air duct assembly comprises a first air duct, a second air duct and a third air duct; in a first working state of the 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 dissipating 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 dissipating heat of the second condenser; and in a second working state of the control valve assembly, the first air channel communicates with the second air channel, the first inlet is closed, and after external air is introduced into the second air channel, the external air entering the second air channel dissipates heat of the second condenser, then flows into the first air channel, dissipates heat of the first condenser in the first air channel and then is output from the first outlet.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to an evaporative refrigeration system and a refrigeration control method. Background Art

[0002] The evaporative refrigeration system is a refrigeration system that includes an evaporative condenser. The evaporative condenser includes condensing coils, heat exchange plates, boxes and other components. It is a device that uses the spray water outside the coil to absorb the heat of the high-temperature gaseous refrigerant in the coil when it evaporates, so that the refrigerant in the tube is gradually cooled from gas to liquid. Some evaporative refrigeration systems only have refrigeration functions, while others have heating functions in addition to refrigeration functions, such as evaporative heat pump systems. For evaporative refrigeration systems that have both evaporative condensers and air-cooled condensers, how to improve the overall energy efficiency is a problem worth studying. Summary of the invention

[0003] The object of the present invention is to provide an evaporative refrigeration system having multiple condenser heat dissipation modes and capable of more energy-saving and efficient operation, and a refrigeration control method using the evaporative refrigeration system.

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

[0005] A refrigeration cycle device, comprising a refrigeration cycle pipeline and a condenser assembly, wherein the condenser assembly comprises a first condenser and a second condenser arranged on the refrigeration cycle pipeline, wherein 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, comprising an air duct assembly, a fan assembly and a control valve assembly, wherein the air duct assembly comprises a first air duct for the first condenser, a second air duct for the second condenser and a third air duct connecting the first air duct and the second air duct, the fan assembly is used to introduce external air into the first air duct and / or the second air duct, and the control valve assembly comprises a plurality of on-off valves arranged in the air duct assembly;

[0007] In which, the control valve assembly has a switchable first working state and a second working state. In the first working state, the first air duct and the second air duct are not connected, and the outside wind flowing into the first air duct from the first inlet of the first air duct dissipates heat to the first condenser and is output from the first outlet of the first air duct, and the outside wind flowing into the second air duct from the second inlet of the second air duct dissipates heat to the second condenser and is output from the second outlet of the second air duct; in the second working state, the first air duct and the second air duct are connected, the first inlet is closed, and after the outside wind is introduced into the second air duct from the second inlet, the outside wind entering the second air duct dissipates heat to the second condenser and flows into the first air duct, and is output from the first outlet after dissipating heat to the first condenser in the first air duct.

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

[0009] In some embodiments, the first air duct includes a first cavity surrounding the first condenser, a first pipe communicating with the first cavity, the first inlet communicating with the first cavity, and the first outlet being provided on the first pipe, the second air duct includes a second cavity surrounding the second condenser, a second pipe communicating with the second cavity, the second inlet communicating with the second cavity, and the second outlet being provided 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 also 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 The outside wind flowing in from the first inlet flows into the first cavity and flows into the first pipe from the first cavity after dissipating heat to the first condenser, and the outside wind flowing in from the second inlet flows into the second cavity and flows into the second pipe from the second cavity after dissipating heat to the second condenser. 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-pipeline, a sixth on-off valve for controlling the on-off of the second sub-pipeline, a seventh on-off valve for controlling the on-off of the third sub-pipeline, and an eighth on-off valve for controlling the on-off of the fourth sub-pipeline.

[0010] In some embodiments, a humidity detection device and a control device for detecting the humidity of external wind are also included. 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 control valve assembly to switch the working state according to 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 the present invention discloses a refrigeration control method using any of the above evaporative refrigeration systems, comprising:

[0014] When the relative humidity of the outside air is (a%, b%), the control valve assembly is switched to the second working state, and the air duct assembly is controlled to introduce the outside air from the second inlet into the second air duct, so that the outside air entering the second air duct flows into the first air duct after dissipating the heat of the second condenser, and is output from the first outlet after dissipating the heat of the first condenser in the first air duct, wherein 0 <a<b<100。

[0015] In some embodiments, the first condenser is an air-cooled condenser, the second condenser is an evaporative condenser, the control valve assembly further has a switchable third working state, in which 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 flows into the second air duct after dissipating the heat of the first condenser, and is output from the second outlet after dissipating the heat of the second condenser in the second air duct, the refrigeration control method further includes:

[0016] When the relative humidity of the outside air is (c%, d%), the control valve assembly is switched to the third working state, and the air duct assembly is controlled to introduce the outside air from the second inlet into the second air duct, so that the outside air entering the second air duct flows into the first air duct after dissipating the heat of the second condenser, and is output from the first outlet after dissipating the heat of the first condenser in the first air duct, 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 air is (0, a%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the outside air from the second inlet into the second air duct, so that the outside air entering the second air duct dissipates heat for the second condenser and then is output from the second outlet of the second air duct, wherein 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 air is (d%, 100%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the outside air from the first inlet into the first air duct, so that the outside air entering the first air duct dissipates heat for the first condenser and then is 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 air is (b%, c%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the outside air from the first inlet into the first air duct and to introduce the outside air from the second inlet into the second air duct, so that the outside air entering the first air duct dissipates heat for the first condenser and is output from the first outlet of the first air duct, and the outside air entering the first air duct dissipates heat for the first condenser and is output from the first outlet of the first air duct, wherein 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 air 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 air into the second air duct from the second inlet, so that the outside air entering the second air duct dissipates heat in the second condenser and is output from the second outlet of the second air duct;

[0025] When the relative humidity of the outside air 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 air from the second inlet into the second air duct, so that the outside air entering the second air duct dissipates heat for the second condenser and then flows into the first air duct, and dissipates heat for the first condenser in the first air duct and then is output from the first outlet;

[0026] When the relative humidity of the outside air 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 air from the first inlet into the first air duct and to introduce the outside air from the second inlet into the second air duct, so that the outside air entering the first air duct dissipates heat for the first condenser and is output from the first outlet of the first air duct, and the outside air entering the first air duct dissipates heat for the first condenser and is output from the first outlet of the first air duct;

[0027] When the relative humidity of the outside air 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 air from the second inlet into the second air duct, so that the outside air entering the second air duct dissipates heat for the second condenser and then flows into the first air duct, and dissipates heat for the first condenser in the first air duct and then is output 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 into the first air duct from the first inlet, so that the outside wind entering the first air duct dissipates heat for the first condenser and is output from the first outlet of the first air duct.

[0029] Based on the evaporative refrigeration system provided by the present invention, by setting up an air duct assembly and a control valve assembly, outside wind can be introduced to dissipate heat for the evaporative condenser and the air-cooled condenser respectively, and outside wind can be introduced to dissipate heat for one of the evaporative condenser and the air-cooled condenser, and then the outside wind after heat exchange can be introduced into the other condenser to exchange heat with the condenser, thereby realizing a variety of condenser heat dissipation modes, and a more energy-saving and efficient condenser heat dissipation mode can be selected according to the humidity of the air.

[0030] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0035] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0038] like Figure 1 As shown, the evaporative refrigeration system of 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 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.

[0040] As shown in the figure, the refrigeration cycle device also includes a compressor 15, an evaporator 14 and an expansion valve assembly 16 arranged on the refrigeration cycle pipeline. During refrigeration, the refrigerant flows in the refrigeration cycle pipeline 13. After the compressor compresses the refrigerant, the refrigerant enters the first condenser 11 and the second condenser 12 for heat dissipation. The air-cooled condenser uses the fan to blow air directly to dissipate heat through convection with the wind. The evaporative condenser, as described in the background technology section, uses the evaporation of water to dissipate heat. The outside air enters the air duct of the evaporative condenser and mainly absorbs the latent heat brought by the evaporation of water. The evaporation of water 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 in the figure, 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 to the refrigerant mainly comes from the phase change of the refrigerant.

[0041] The heat exchange device includes an air duct assembly, a fan assembly and a control valve assembly. The air duct assembly includes a first air duct 5 for a first condenser 11, a second air duct 6 for a 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 to introduce external wind into the first air duct 5 and / or the second air duct 6. The control valve assembly includes a plurality of on-off valves arranged in the air duct assembly.

[0042] The first air duct is used to guide the wind for dissipating heat to the first condenser, and the second air duct is used to guide the wind for dissipating heat to the second condenser. External wind refers to the wind formed by introducing air from the external environment. The fan assembly can introduce external wind into the first air duct 5, and can also introduce external wind into the second air duct 6. In some embodiments, the external wind introduced into the first air duct 5 and the second air duct 6 can be introduced simultaneously, or separately, for example, only the external wind is introduced into the first air duct 5, and the external wind is not introduced into the second air duct 6. The fan assembly introduces external wind by sucking or blowing.

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

[0044] That is, the external wind entering the first air duct 5 will not flow into the second air duct 6 before being output from the first outlet of the first air duct 5. The external wind entering the first air duct 5 will be directly output to the external environment or collected after being output from the first outlet of the first air duct 5, and will not flow into the second air duct 6. The external wind entering the second air duct 6 will not flow into the first air duct 5 before being output from the second outlet of the second air duct 6. The external wind entering the second air duct 6 will be directly output to the external environment or collected after being output from the second outlet of the second air duct 6, and will not flow into the first air duct 5. In the first working state of the control valve assembly, the fan assembly can control the introduction of external wind only into the first air duct 5 to dissipate heat to the first condenser and then discharge it directly to the external environment, or control the introduction of external wind only into the second air duct 6 to dissipate heat to the second condenser and then discharge it directly to the external environment. In some embodiments, the fan assembly can also control the introduction of external wind into the first air duct 5 and the second air duct 6 at the same time to dissipate heat to the condenser in the air duct, and then discharge it directly to the external environment from the first air duct and the second air duct 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, and the outside air entering the second air duct 6 from the second inlet flows into the first air duct 5 after dissipating heat to the second condenser 12, and is output from the first outlet after dissipating heat to the first condenser 11 in the first air duct 5.

[0046] When the first condenser 11 is an air-cooled condenser and the second condenser 12 is an evaporative condenser, when the control valve assembly is in the second working state, when the outside wind sent from the second inlet to the second air duct 6 by the fan assembly first dissipates heat to the evaporative condenser in the second air duct, the outside wind in the evaporative condenser mainly absorbs heat from the latent heat brought by the water vapor evaporated from the spray water of the evaporative condenser, and the evaporation of water absorbs the sensible heat of the air. If the relative humidity of the outside wind (i.e., the outside air) in the second air duct is low, the wet-bulb temperature of the outside wind will increase and the dry-bulb temperature will decrease when passing through the evaporative condenser. By using this outside wind with a low dry-bulb temperature to enter the first air duct to dissipate heat to the air-cooled condenser, a better cooling effect can be obtained than directly using the outside wind to dissipate heat to the air-cooled condenser, that is, a better cooling effect can be obtained through the second working state in an environment with low relative humidity of the outside wind.

[0047] When the first condenser 11 is an evaporative condenser and the second condenser 12 is an air-cooled condenser, when the control valve assembly is in the second working state, when the outside wind sent from the second inlet to the second air duct 6 by the fan assembly first dissipates heat to the air-cooled condenser in the second air duct, the dry bulb temperature of the outside wind in the air-cooled condenser will rise and the relative humidity will decrease. If the relative humidity of the introduced outside wind (i.e., the outside air) is high, the relative humidity can be greatly reduced by the outside wind passing through the air-cooled condenser, thereby greatly increasing the ability to absorb water vapor. At this time, the outside wind with low relative humidity is used to enter the first air duct to dissipate heat to the evaporative condenser, which can obtain a better cooling effect than directly using the outside wind to dissipate heat to the evaporative condenser, that is, a better cooling effect can be obtained through the second working state in an environment where the relative humidity of the outside wind is high.

[0048] The evaporative refrigeration system of the present embodiment can be switched to a first working state in which the outside wind dissipates heat to the evaporative condenser and the air-cooled condenser independently by setting an air duct assembly and a control valve assembly. It can also be switched to a second working state in which the outside wind dissipates heat to one of the evaporative condenser and the air-cooled condenser and then the heat-exchanged outside wind is introduced into the other condenser to exchange heat with the condenser, thereby realizing a variety of heat dissipation modes for the condensers. Different working states can be selected according to the humidity of the outside air, thereby selecting a more matching, energy-saving and efficient condenser heat dissipation mode.

[0049] In some embodiments, 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 connected, and the second inlet is closed. 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 for the first condenser 11 and then flows into the second air duct 6, and dissipates heat for the second condenser 12 in the second air duct 6 and then 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 the second working state and the third working state, the embodiment can realize the switching between the heat dissipation mode in which the outside wind first enters the air duct to dissipate the heat of the air-cooled condenser, and then enters the other air duct to dissipate the heat of the evaporative condenser, and the heat dissipation mode in which the outside wind first enters the air duct to dissipate the heat of the evaporative condenser, and then enters the other air duct to dissipate the heat of the air-cooled condenser. Thus, when the humidity of the outside wind changes, it is possible to switch between the second working state and the third working state. For example, the second working state is that the outside wind first enters the air duct to dissipate the heat of the air-cooled condenser, and then enters the other air duct to dissipate the heat of the evaporative condenser. This working state is suitable for the situation where the relative humidity of the outside wind is high. When the relative humidity of the outside wind is low, the control valve assembly is switched to the third working state, so that the outside wind first enters the air duct to dissipate the heat of the evaporative condenser, and then enters the other air duct to dissipate the heat of the air-cooled condenser. The control valve assembly of this embodiment has more working states, and can better adapt to more situations such as the relative humidity of the external wind is very high, relatively high, relatively low, very low, etc. The evaporative refrigeration system can achieve good energy-saving and high-efficiency effects in more external wind relative humidity environments.

[0051] In some embodiments, Figure 1As shown, the first air duct 5 includes a first cavity 51 surrounding the first condenser 11, a first pipe 52 communicating with the first cavity 51, a first inlet communicating with the first cavity 51, and a first outlet provided on the first pipe 52. In the embodiment shown in the figure, the first inlet is provided on the outer shell of the first cavity 51, and the first outlet is provided at one end of the first pipe 52 away from the communication position of the first pipe 52 and the first cavity 51. The second air duct 6 includes a second cavity 61 surrounding the second condenser 12, a second pipe 62 communicating with the second cavity 61, a second inlet communicating with the second cavity 61, and a second outlet provided on the second pipe 62. In the embodiment shown in the figure, the second inlet is provided on the outer shell of the second cavity 61, and the second outlet is provided at one end of the second pipe 62 away from the communication position of the first pipe 62 and 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 with the first duct 52, the second duct 62, the first cavity 51 and the second cavity 61, and the third air duct 4 also includes a fifth sub-duct 45 which is simultaneously connected with the first sub-duct 41, the second sub-duct 42, the third sub-duct 43 and the fourth sub-duct 44. In the first working state, the outside wind flowing in from the first inlet flows into the first cavity 51 and flows into the first duct 52 from the first cavity 51 after dissipating heat to the first condenser 11, and the outside wind flowing in from the second inlet flows into the second cavity 61 and flows into the second duct 62 from the second cavity 61 after dissipating heat to the second condenser 12. The control valve assembly includes 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. The first on-off valve 31, the second on-off valve 32, the third on-off valve 33, the fourth on-off valve 34, the fifth on-off valve 35, the sixth on-off valve 36, the seventh on-off valve 37, and the eighth on-off valve 38 are switch valves or throttle valves with adjustable flow areas. The opening or closing of the first on-off valve 31 can control the opening or closing of the first inlet, the opening or closing of the second on-off valve 32 can control the opening or closing of the second inlet, the opening or closing of the third on-off valve 33 can control the opening or closing of the first outlet, the opening or closing of the fourth on-off valve 34 can control the opening or closing of the second outlet, the opening or closing of the fifth on-off valve 35 can control the opening or closing of the first sub-pipeline 41, the opening or closing of the sixth on-off valve 36 can control the opening or closing of the second sub-pipeline 42, the opening or closing of the seventh on-off valve 37 can control the opening or closing of the third sub-pipeline 43, and the opening or closing of the eighth on-off valve 38 can control the opening or closing of the fourth sub-pipeline 44.

[0052] The control valve assembly can be switched to the first working state by opening the first on-off valve 31, opening the second on-off valve 32, opening the third on-off valve 33, opening 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 working 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 working 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 can conveniently and effectively realize various working states of the control valve assembly and realize various condenser heat dissipation modes through the arrangement of the first pipeline 52, the second pipeline 62, the above-mentioned multiple sub-pipelines and multiple on-off valves. In some embodiments, the arrangement of the air duct assembly, the fan assembly and the control valve assembly is not limited to the above-mentioned method. For example, the air duct assembly can also be provided with more pipelines and on-off valves. For realizing the heat dissipation mode in which the outside wind first enters the air duct to dissipate the heat of the air-cooled condenser, and then enters another air duct to dissipate the heat of the evaporative condenser, a special pipeline is arranged to connect the output end of the air-cooled condenser and the input end of the evaporative condenser, and a special on-off valve is arranged in the pipeline to control the opening or closing of the pipeline. For realizing the heat dissipation mode in which the outside wind first enters the air duct to dissipate the heat of the evaporative condenser, and then enters another air duct to dissipate the heat of the air-cooled condenser, a special pipeline is arranged to connect the input end of the air-cooled condenser and the output end of the evaporative condenser, and a special on-off valve is arranged in the pipeline to control the opening or closing of the pipeline. For the air-cooled condenser to work independently, a special pipeline is set to be connected to the output end of the air-cooled condenser, and an on-off valve is set in the pipeline. For the evaporative condenser to work independently, a special pipeline is set to be connected to the output end of the evaporative condenser, and an on-off valve is set in the pipeline. When entering different heat dissipation modes, the corresponding special pipeline is selected to open and other special pipelines are closed. For the setting of the fan assembly, two fans located in the pipeline can be set as shown in the figure, or the fan can be set outside the pipeline, and the wind is introduced into the pipeline by blowing or sucking.

[0053] In some embodiments, it also includes a ninth on-off valve 391 provided in the first pipeline for controlling the on-off of the first pipeline, a tenth off valve 392 provided in the second pipeline for controlling the on-off of the second pipeline, and an eleventh on-off valve 393 provided in the fifth sub-pipeline for controlling the on-off 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 connected to the humidity detection device, the fan assembly and the control valve assembly by signal. The control device is configured to control the fan assembly to work and control the control valve assembly to switch the working state according to the detection result of the humidity detection device. In this embodiment, the relative humidity of the outside wind can be obtained by detecting the humidity of the outside wind. The control device can automatically control the control valve assembly to switch to a suitable working state and control the fan assembly to perform matching work, 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 arranged in the first air duct 5 and the 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 external wind into the first air duct, and the second fan is used to introduce external wind into the second air duct. By setting the first fan and the second fan, this embodiment can independently and flexibly control the introduction of external wind into the first air duct and the second air duct, thereby realizing a variety of condenser heat dissipation modes.

[0056] In some embodiments, the evaporative cooling system is an evaporative heat pump system. In the embodiment shown in the figure, the compressor is connected to the evaporator and condenser components through a four-way valve. When heating, the air-cooled condenser starts working, and the evaporative condenser does not start working. This embodiment can achieve cooling and heating, and can achieve more functions.

[0057] In some embodiments, a refrigeration control method using any of the above 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 dissipates heat from the second condenser 12 and then flows into the first air duct 5, and dissipates heat from the first condenser 11 in the first air duct 5 and is then 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%), b < 50. When the control valve assembly is in the second working state, after the fan assembly introduces the external wind from the second inlet into the second air duct 6, the external wind first dissipates heat from the evaporative condenser in the second air duct. In the evaporative condenser, the main heat absorption source of the external wind is the latent heat absorbed from the evaporation of the water vapor in the sprayed water of the evaporative condenser, and the evaporation of water will absorb 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 dissipate heat from the air-cooled condenser can obtain a better cooling effect than directly using the external wind to dissipate heat from the air-cooled condenser. This embodiment can obtain a better cooling effect and is more energy-efficient in an environment with a relatively low relative humidity of the external wind. 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%), a > 50. When the control valve assembly is in the second working state, after the fan assembly introduces the external wind from the second inlet into the second air duct 6, the external wind first dissipates heat from 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 dissipate heat from the evaporative condenser can obtain a better cooling effect than directly using the external wind to dissipate heat from the evaporative condenser. This embodiment can obtain a better cooling effect and is more energy-efficient in an environment with a relatively high relative humidity of the external wind.

[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 dissipates heat from the first condenser 11 and then flows into the second air duct 6, and dissipates heat from the second condenser 12 in the second air duct 6 and is then 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 dissipates heat from the second condenser 12 and then flows into the first air duct 5, and after dissipating heat from 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 through the state switching 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, and the second condenser 12 is an evaporative condenser. 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 dissipates heat from 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 of the evaporative condenser to the total heat dissipation will be very high. At this time, the air-cooled condenser can be selected to be closed to save the electric energy consumed by electrical components such as the fan, 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, and the second condenser 12 is an evaporative condenser. 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 dissipates heat from 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 of the evaporative condenser to the total heat dissipation will be very low. At this time, the evaporative condenser can be closed, and the air-cooled condenser is used for single heat dissipation to save the electric energy consumed by electrical components such as the fan and the water pump, 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 dissipates heat from 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 dissipates heat from 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 proportion of the heat dissipation of the evaporative condenser to the heat dissipation of 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 dissipates heat from 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 dissipates heat from the second condenser 12 and then flows into the first air duct 5, and dissipates heat from 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 dissipates heat from 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 dissipates heat from 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 dissipates heat from the second condenser 12 and then flows into the first air duct 5, and dissipates heat from 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 air 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 air from the first inlet into the first air duct 5, so that the outside air entering the first air duct 5 dissipates heat to the first condenser 11 and is 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 air, which is more energy-saving and efficient.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. An evaporative refrigeration system, characterized in that: include: A refrigeration cycle device comprises a refrigeration cycle pipeline (13) and a condenser assembly, wherein the condenser assembly comprises a first condenser (11) and a second condenser (12) arranged on the refrigeration cycle pipeline (13), wherein one of the first condenser (11) and the second condenser (12) is an evaporative condenser and the other is an air-cooled condenser; A heat exchange device, comprising an air duct assembly, a fan assembly and a control valve assembly, wherein 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 to introduce 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 a switchable first working state and a second working state. In the first working state, the first air duct (5) and the second air duct (6) are not connected. The outside air flowing into the first air duct (5) from the first inlet of the first air duct (5) dissipates heat for the first condenser (11) and is then output from the first outlet of the first air duct (5). The outside air flowing into the second air duct (6) from the second inlet of the second air duct (6) dissipates heat for the second condenser (12) and is then output from the second outlet of the second air duct (6). In the second working state, the first air duct (5) and the second air duct (6) are connected, the first inlet is closed, and after the outside air is introduced into the second air duct (6) from the second inlet, the outside air entering the second air duct (6) dissipates heat for the second condenser (12) and then flows into the first air duct (5). The outside air is dissipated in the first air duct (5) and is then output from the first outlet.

2. The evaporative cooling system according to claim 1, characterized in that: 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 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 in the first condenser (11) and then flows into the second air duct (6), and dissipates heat in the second condenser (12) in the second air duct (6) and then is output from the second outlet.

3. The evaporative refrigeration system according to claim 1, characterized in that: The first air duct (5) comprises a first cavity (51) surrounding the first condenser (11), a first pipe (52) communicating with the first cavity (51), the first inlet communicating with the first cavity (51), and the first outlet being arranged on the first pipe (52); the second air duct (6) comprises a second cavity (61) surrounding the second condenser (12), a second pipe (62) communicating with the second cavity (61), the second inlet communicating with the second cavity (61), and the second outlet being arranged on the second pipe (62); the third air duct (4) comprises a first sub-pipe (41), a second sub-pipe (42), a third sub-pipe (43), and a fourth sub-pipe (44) respectively communicating with the first pipe (52), the second pipe (62), the first cavity (51), and the second cavity (61); the third air duct (4) further comprises a fifth sub-pipe communicating with the first sub-pipe (41), the second sub-pipe (42), the third sub-pipe (43), and the fourth sub-pipe (44) (45), in a first working state, the outside air flowing in from the first inlet flows into the first cavity (51) and flows into the first pipe (52) from the first cavity (51) after dissipating heat to the first condenser (11); the outside air flowing in from the second inlet flows into the second cavity (61) and flows into the second pipe (62) from the second cavity (61) after dissipating heat to the second condenser (12); 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 according to any one of claims 1 to 3, characterized in that: It also includes a humidity detection device and a control device for detecting the humidity of the external 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 control valve assembly to switch the working state according to the detection result of the humidity detection device.

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

6. The evaporative refrigeration system according to any one of claims 1 to 3, characterized in that: The evaporative refrigeration system is an evaporative heat pump system.

7. A refrigeration control method using the evaporative refrigeration system according to any one of claims 1 to 6, characterized in that: include: When the relative humidity of the outside air is (a%, b%), the control valve assembly is switched to the second working state, and the air duct assembly is controlled to introduce the outside air from the second inlet into the second air duct (6), so that the outside air entering the second air duct (6) dissipates heat in the second condenser (12) and then flows into the first air duct (5), and dissipates heat in the first condenser (11) in the first air duct (5) and then is output from the first outlet, wherein 0 <a<b<100。 8. The refrigeration control method according to claim 7, characterized in that: The first condenser (11) is an air-cooled condenser, and 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 connected, and the second inlet is closed. 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 for the first condenser (11) and then flows into the second air duct (6). After dissipating heat for the second condenser (12) in the second air duct (6), the outside air is output from the second outlet. The refrigeration control method further comprises: When the relative humidity of the outside air is (c%, d%), the control valve assembly is switched to a third working state, and the air duct assembly is controlled to introduce the outside air from the second inlet into the second air duct (6), so that the outside air entering the second air duct (6) dissipates heat in the second condenser (12) and then flows into the first air duct (5), and dissipates heat in the first condenser (11) in the first air duct (5) and then is output from the first outlet, wherein 0 <a<b<50<c<d<100。 9. The refrigeration control method according to claim 7, characterized in that: 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 outside air is (0, a%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the outside air from the second inlet into the second air duct (6), so that the outside air entering the second air duct (6) dissipates heat for the second condenser (12) and is then output from the second outlet of the second air duct (6), wherein 0 <a<50。 10. The refrigeration control method according to claim 7, characterized in that: 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 outside air is (d%, 100%), the control valve assembly is switched to the first working state, and the air duct assembly is controlled to introduce the outside air from the first inlet into the first air duct (5), so that the outside air entering the first air duct (5) dissipates heat for the first condenser (11) and is then output from the first outlet of the first air duct (5), wherein 50 <d<100。 11. The refrigeration control method according to claim 7, characterized in that: Also includes: When the relative humidity of the outside air is (b%, c%), the control valve assembly is switched to a first working state, and the air duct assembly is controlled to introduce the outside air from the first inlet into the first air duct (5) and to introduce the outside air from the second inlet into the second air duct (6), so that the outside air entering the first air duct (5) dissipates heat for the first condenser (11) and is then output from the first outlet of the first air duct (5), and the outside air entering the first air duct (5) dissipates heat for the first condenser (11) and is then output from the first outlet of the first air duct (5), wherein 0 <b<50<c<100。 12. The refrigeration control method according to claim 7, characterized in that: The first condenser (11) is an air-cooled condenser, the second condenser (12) is an evaporative condenser, and the refrigeration control method comprises at least one of the following: When the relative humidity of the outside air 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 air into the second air duct (6) from the second inlet, so that the outside air entering the second air duct (6) dissipates heat for the second condenser (12) and is then output from the second outlet of the second air duct (6); When the relative humidity of the outside air is (20%, 40%), the control valve assembly is switched to a second working state, and the air duct assembly is controlled to introduce the outside air from the second inlet into the second air duct (6), so that the outside air entering the second air duct (6) dissipates heat in the second condenser (12) before flowing into the first air duct (5), and dissipates heat in the first condenser (11) in the first air duct (5) before being output from the first outlet; When the relative humidity of the outside air is (40%, 60%), the control valve assembly is switched to a first working state, and the air duct assembly is controlled to introduce the outside air from the first inlet into the first air duct (5) and to introduce the outside air from the second inlet into the second air duct (6), so that the outside air entering the first air duct (5) dissipates heat for the first condenser (11) and is output from the first outlet of the first air duct (5), and the outside air entering the first air duct (5) dissipates heat for the first condenser (11) and is output from the first outlet of the first air duct (5); When the relative humidity of the outside air is (60%, 80%), the control valve assembly is switched to a third working state, and the air duct assembly is controlled to introduce the outside air from the second inlet into the second air duct (6), so that the outside air entering the second air duct (6) dissipates heat in the second condenser (12) before flowing into the first air duct (5), and dissipates heat in the first condenser (11) in the first air duct (5) before being output from the first outlet; When the relative humidity of the outside air 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 air into the first air duct (5) from the first inlet, so that the outside air entering the first air duct (5) dissipates heat to the first condenser (11) and is then output from the first outlet of the first air duct (5).

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