A finned tube heat exchanger assembly, its air conditioning unit, and air conditioning system

Abstract

This invention belongs to the field of high-efficiency and energy-saving air conditioning technology, and discloses a finned tube heat exchanger assembly, its air conditioning unit, and air conditioning system. The finned tube heat exchanger assembly consists of at least two flat-plate finned tube heat exchangers; the cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fins is a broken line shape; the long side of the fins of the flat-plate finned tube heat exchangers is arranged in a vertical or nearly vertical direction; the air conditioning unit includes a shell, the finned tube heat exchanger assembly, an air conditioning compressor, a gas-liquid separator, and a fan; the finned tube heat exchanger assembly is located on the air inlet surface of the shell and forms a negative pressure chamber with at least a portion of the shell, communicating with the heat exchange airflow path. This invention constructs a high-efficiency heat exchange airflow path structure for the finned tube heat exchanger assembly of the air conditioning unit, improving the energy density of the air conditioning unit; facilitating the inspection and maintenance of the air conditioning unit; and creating conditions for constructing a side-inlet, side-outlet airflow path structure to match the external facade of the equipment platform.

Description

Technical Field

[0001] This invention belongs to the field of high-efficiency and energy-saving air conditioning technology, and more specifically, relates to a finned tube heat exchanger assembly and its air conditioning unit and air conditioning system. Background Technology

[0002] Current air conditioning units, such as multi-split systems and air-cooled water chiller modules, primarily use finned tubes with a horizontal cross-section of C-shape or a vertical cross-section of V-shape as their basic design, with a basic airflow fan at the top. These C-shaped or V-shaped finned tube heat exchangers have more than one air inlet. C-shaped finned tube heat exchangers use three-sided air inlet, while V-shaped finned tube heat exchangers use two-sided air inlet. However, this external heat exchanger and airflow structure results in the air distribution duct of the external heat exchanger on the equipment platform occupying a much larger area than the air conditioning unit itself. For example, when two rows of air conditioning units with C-shaped finned tube heat exchangers with horizontal cross sections are arranged on the equipment platform, it is necessary to reserve airflow channels of sufficient width between adjacent units in the front row and between the front and rear rows of units to meet the air supply and distribution needs of the air conditioning units, especially the external heat exchangers of the rear air conditioning units. These air supply and distribution channels occupy a much larger area than the air conditioning unit itself.

[0003] Solving the above problems requires innovations in the structure of the external heat exchanger and the air duct structure of the air conditioning unit.

[0004] Furthermore, considering existing air conditioner external heat exchangers, the technical approach of significantly increasing the heat exchange capacity Q by expanding the overall heat transfer coefficient K and the heat transfer temperature difference Δt within the heat exchanger body, within the heat exchanger heat transfer capacity Q = K × S × Δt, is no longer effective. This is because technologies such as corrugated fins, slotted fins, and internally threaded copper tubes are widely used in the evaporators and condensers of existing refrigeration and air conditioning systems, bringing the overall heat transfer coefficient K of the air conditioner's external heat exchanger close to its peak value. The marginal effect of further optimizing the fin structure, copper tube structure, and the airflow relationship between the fins and copper tubes to increase the K value has sharply diminished. Moreover, expecting to increase the heat exchange capacity Q by expanding the heat transfer temperature difference Δt between the evaporator and condenser body under specific low-temperature and high-temperature heat source scenarios—that is, under conditions where the temperature, humidity, and other thermophysical properties of the high-temperature and low-temperature media in which the condenser and evaporator operate—is also no longer effective. Increasing the temperature difference (Δt) between the low-temperature medium (e.g., low-temperature indoor air in summer) between the evaporator fins and the refrigerant inside the copper tubes inevitably lowers the evaporation temperature and pressure. Conversely, increasing the temperature difference (Δt) between the high-temperature, high-pressure refrigerant gas inside the condenser copper tubes and the high-temperature medium (e.g., high-temperature ambient air in summer) between the condenser fins inevitably raises the condensation pressure and temperature. Therefore, any approach that increases the heat transfer temperature difference (Δt) between the evaporator and condenser to improve the heat exchanger's heat transfer capacity (Q) actually harms the refrigerant circulation rate, heat absorption capacity, heat release capacity, and COP of the entire refrigeration system.

[0005] Therefore, given that heat exchanger materials and structures have been thoroughly optimized and the target COP of the system has been continuously improved, the potential to increase K and Δt to increase Q has been exhausted. How to improve the heat exchanger's heat exchange capacity has become a major technical challenge. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, the present invention provides a finned tube heat exchanger assembly.

[0007] Another object of the present invention is to provide an air conditioning unit using a zigzag finned tube heat exchanger.

[0008] Another object of the present invention is to provide an air conditioning system.

[0009] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0010] A finned tube heat exchanger assembly, comprising at least two flat-plate finned tube heat exchangers; or comprising a V-shaped finned tube heat exchanger formed by bending flat-plate finned tube heat exchangers; or comprising a flat-plate finned tube heat exchanger and the V-shaped finned tube heat exchanger formed by bending flat-plate finned tube heat exchangers; wherein the cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fins is a zigzag shape.

[0011] The long sides of the fins of the flat plate finned tube heat exchanger are arranged in the vertical direction or close to the vertical direction in the horizontal air duct.

[0012] Furthermore, the finned tube heat exchanger assembly has a V-shaped or N-shaped cross-section perpendicular to the long side of the fins, or is composed of at least two finned tube heat exchangers with a V-shaped cross-section perpendicular to the long side of the fins arranged continuously.

[0013] Preferably, the cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fins is W-shaped; preferably, the apex angle α of the V-shaped finned tube heat exchanger is 15° to 110°.

[0014] Preferably, the apex angle α of the V-shaped finned tube heat exchanger is 30° to 90°.

[0015] Preferably, the apex angle α of the V-shaped finned tube heat exchanger is 30° to 60°.

[0016] Furthermore, one side of the cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fins is the air inlet side of the heat exchanger, and the other side is the air outlet side of the heat exchanger; the air outlet side belongs to the negative pressure chamber area of ​​the heat exchanger assembly.

[0017] Furthermore, the incident surface of the inlet airflow is each flat finned tube heat exchanger in the finned tube heat exchanger assembly, and the angle between the inlet airflow and the tip of each finned plate on each flat finned tube heat exchanger is an obtuse angle; the obtuse angle β is 97.5°~145°; the inlet airflow impacts the tip of each finned plate in the finned tube heat exchanger assembly at an obtuse angle β, and is reflected by the fin tip plate into the fin gap and flows into the negative pressure chamber of the heat exchanger assembly.

[0018] Furthermore, the airflow rate entering each fin gap d is equal to the airflow intercepted by the vertical distance δ between the tips of the front and rear fin plates of the flat plate finned tube heat exchanger in the finned tube heat exchanger assembly on the air inlet section.

[0019] δ=d·sinα / 2, where α is the apex angle of the V-shaped finned tube heat exchanger;

[0020] The vertical distance δ between the tips of the front and rear finned tube heat exchangers on the air inlet section is between 0.13d and 0.7d.

[0021] Preferably, the airflow velocity between the fins is 1 / 3 of the inlet velocity, corresponding to a vertex angle α of 39° and an incident obtuse angle β of 109.5° for the V-shaped finned tube heat exchanger.

[0022] An air conditioning unit employing a zigzag finned tube heat exchanger includes a housing, the finned tube heat exchanger assembly, an air conditioning compressor, a gas-liquid separator, and a fan; the finned tube heat exchanger assembly is located on the air inlet surface of the housing and forms a heat exchanger assembly negative pressure chamber communicating with at least a portion of the housing for heat exchange airflow.

[0023] Furthermore, the bottom plate, side plate, back plate, top plate of the shell and the finned tube heat exchanger assembly are combined to form the negative pressure chamber of the heat exchanger assembly; the finned tube heat exchanger assembly is the air inlet of the negative pressure chamber of the heat exchanger assembly.

[0024] Preferably, the back plate or top plate is provided with an air outlet for the negative pressure chamber of the heat exchanger assembly.

[0025] Preferably, an air outlet for the negative pressure chamber of the heat exchanger assembly is provided on the top plate at a location away from the finned tube heat exchanger assembly; a fan is provided at the air outlet of the negative pressure chamber of the heat exchanger assembly.

[0026] Furthermore, the air outlet of the negative pressure chamber of the heat exchanger assembly is provided with an exhaust chamber, and the exhaust port of the exhaust chamber is located on the same side as the air inlet of the shell.

[0027] Preferably, the exhaust port of the exhaust cavity faces the short side of the air conditioner unit housing.

[0028] Furthermore, the area below the air outlet of the negative pressure chamber of the heat exchanger assembly, adjacent to the back plate, is a ventilation blind zone; the refrigerant circuit components, including the air conditioning compressor, gas-liquid separator, four-way valve, expansion valve, and electrical box, are located in the ventilation blind zone inside the negative pressure chamber of the heat exchanger assembly.

[0029] The gas-liquid separator, air conditioning compressor, four-way valve, heat exchanger assembly, expansion valve, and refrigerant pipeline of the indoor unit of the air conditioner are connected in sequence to form the refrigerant circulation loop of the air conditioning system.

[0030] Furthermore, the refrigerant circuit assembly, including the air conditioning compressor, gas-liquid separator, four-way valve, expansion valve, and electrical box, is located in the compressor chamber on the outside side of the negative pressure chamber of the heat exchanger assembly in the housing.

[0031] Furthermore, the two side plates of the negative pressure chamber of the heat exchanger assembly are replaced with the flat plate finned tube heat exchanger.

[0032] Furthermore, the side plate at the air inlet of the shell is provided with several through holes for supplementing air intake to the finned tube heat exchanger; the through holes and the air inlet of the shell constitute the air intake channel of the finned tube heat exchanger assembly.

[0033] Furthermore, the fan is an axial flow fan or a centrifugal fan.

[0034] Furthermore, a heightening bracket for installing the finned tube heat exchanger is provided inside the shell; the finned tube heat exchanger assembly is mounted on the heightening bracket; the space extended by the heightening bracket forms the bottom air inlet channel of the finned tube heat exchanger assembly.

[0035] An air conditioning system is composed of an air conditioning unit using a zigzag-shaped finned tube heat exchanger.

[0036] Furthermore, the air conditioning system includes an air conditioning unit, an intermediate heat exchanger, a water circuit, and a water pump; the two heat exchange medium channels of the intermediate heat exchanger are the refrigerant channel of the air conditioning unit and the air conditioning water channel, respectively; the refrigerant channel is connected to the refrigerant circuit of the air conditioning unit; and the air conditioning water channel is connected to the indoor heat exchanger.

[0037] Furthermore, the intermediate heat exchanger includes a plate heat exchanger, a shell-and-tube heat exchanger, a coaxial heat exchanger, or a combination of plate heat exchangers, shell-and-tube heat exchangers, and coaxial heat exchangers.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] ① Construct a high-efficiency heat exchange air path structure for the finned tube heat exchanger assembly of the air conditioning unit to improve the energy density of the air conditioning unit.

[0040] This invention adopts an aerodynamic layout with medium-speed air intake on the lower middle part of the short side and high-speed air exhaust at the top, incorporating the main sections of the air intake and exhaust channels of the finned tube heat exchanger assembly into the interior of the air conditioning unit.

[0041] This invention uses a horizontal V-shaped finned tube heat exchanger as the basic unit of the air conditioner main unit's finned tube heat exchanger assembly. Within the limited space of the air conditioner main unit, multiple horizontal V-shaped finned tube heat exchangers are continuously arranged parallel to the air inlet surface of the air conditioner main unit. The finned tube heat exchangers are spread out along the air inlet surface of the multiple horizontal V-shaped finned tube heat exchangers to obtain a large area of ​​ventilation surface for the finned tube heat exchanger assembly. The finned tube heat exchanger assembly is then spread out again on the ventilation surface of the large area of ​​the finned tube heat exchanger assembly to obtain a huge area of ​​finned heat transfer surface.

[0042] In this invention, the external airflow enters the air conditioning unit at a medium speed of about 4 m / s. Inside the air conditioning unit, it is continuously and progressively planed by multiple fin cutters, causing the main airflow to slow down and disperse. It then passes through the finned tube heat exchanger assembly, which features a large total ventilation surface and a huge total heat exchange area S, at a low speed of about 1.6 m / s with low resistance, for heat exchange. After heat exchange, it flows into the negative pressure chamber of the heat exchanger assembly and converges towards the fan inlet under the negative pressure of the fan. After being accelerated and pressurized by the fan, it is finally discharged from the exhaust chamber at a high speed of about 8 m / s.

[0043] The air conditioning unit of the present invention adopts the above-mentioned aerodynamic layout and airflow structure. In the chain process of medium-speed airflow into the heat exchanger → fin planer disperses and decelerates → heat exchange on the huge heat exchange area S of the total large ventilation surface → convergence and acceleration → fan pressurization → high-speed discharge, the airflow takes the fan as the power source, the negative pressure chamber as the core, and the fin gap of the huge continuous arrangement of V-shaped fin heat exchangers as the lowest speed zone. It completes one fan pressurization and static pressure-dynamic pressure conversion in front of the fan, which is efficient and smooth, and constructs an efficient heat exchange airflow structure inside the air conditioning unit.

[0044] The present invention's air conditioning unit unfolds a huge finned tube heat exchanger assembly and ventilation surface, and then unfolds a huge finned heat exchange area S on the huge ventilation surface, which reduces the heat transfer temperature difference Δt of the heat exchanger body, reduces the condensing pressure, increases the evaporating pressure, increases the refrigerant circulation, evaporator heat absorption, and condenser heat release, and also effectively controls the volume of the air conditioning unit, increases the energy density of the air conditioning unit, and prepares the preconditions for improving the energy density of the equipment platform.

[0045] ② Facilitate air conditioner unit inspection and repair

[0046] This invention centrally positions all refrigerant circuit components, such as the compressor, gas-liquid separator, four-way valve, expansion valve, and electrical box, in the ventilation blind zone of the lower middle part of the negative pressure chamber of the heat exchanger assembly, close to the back plate. Furthermore, the back plate of the negative pressure chamber of the heat exchanger assembly is located on the short side of the air conditioning unit. When the air conditioning unit is installed on the equipment platform, the back plate of the negative pressure chamber of the heat exchanger assembly faces the maintenance passage on the inner side of the equipment platform.

[0047] The components of an air conditioning unit that may malfunction are typically moving parts of the refrigerant circuit, such as the compressor, four-way valve, expansion valve, and electrical box, as well as circuit components such as contactors, controllers, sensors, and fans. The structural design of the air conditioning unit in this invention facilitates inspection and maintenance: when a malfunction occurs, the back panel can be opened through the maintenance channel on the inside of the equipment platform, providing a clear view of the refrigerant circuit components such as the compressor, four-way valve, expansion valve, electrical box, and fan, making inspection and maintenance extremely convenient and solving the inherent historical problem of inspection and maintenance of air conditioning units.

[0048] ③ This created conditions for constructing a side-inlet, side-outlet airflow structure to complement the exterior facade of the equipment platform.

[0049] The classic top-discharge central air conditioning unit is tailor-made for rooftop terrace scenarios; moving it from the rooftop terrace to the middle floor equipment platform of the building requires an innovative combination of the air duct of the top-discharge air conditioning unit and the exterior facade of the platform.

[0050] This invention establishes an aerodynamic layout of "medium-speed air intake in the lower part of the air conditioning unit, high-speed exhaust in the top exhaust cavity, with the air intake and exhaust ports facing the same direction and side, and the ratio of air intake area to exhaust area approximately 2:1". An "exhaust cavity" with an exhaust cross-sectional area approximately half that of the air intake surface is set at the top of the negative pressure cavity of the heat exchanger assembly located along the long side of the air conditioning unit, thus utilizing the unused space at the top of the equipment platform.

[0051] This invention not only has a compact structure, but also features air conditioning unit exhaust and air inlet arranged in the same direction, on the same side, and vertically, which prepares the conditions for installation on the equipment platform adjacent to the exterior facade and for constructing a side-inlet and side-outlet air path structure for the air conditioning unit in conjunction with the exterior facade of the equipment platform.

[0052] Under the design concept of air inlet area: exhaust area ≈ 2:1, the exhaust speed of this invention reaches twice the air inlet speed, and the exhaust dynamic pressure head reaches four times the air inlet dynamic pressure head. This effectively improves the exhaust speed and kinetic energy of the heat exchanger assembly of the air conditioning unit, and effectively improves the range and diffusion dilution effect of the exhaust jet of the air conditioning unit penetrating the outer facade of the equipment platform and entering the ambient atmosphere. Attached Figure Description

[0053] Figure 1 A three-dimensional structural diagram of a horizontal V-shaped finned tube heat exchanger;

[0054] Figure 2 This is a three-dimensional structural diagram of the finned tube heat exchanger assembly in Example 1;

[0055] Figure 3 A horizontal cross-sectional view of the air conditioner unit during operation, showing how the "fin planer" at the fin gap inlet intercepts the incoming airflow, performs a stepped planing to slow it down, and then flows into the fin gap to complete heat exchange with the fins before being discharged from the fin gap.

[0056] Figure 4 This is a schematic diagram showing the total temperature difference between the condenser body and the evaporator body in an air conditioning system, which is the sum of the three temperature differences: the condenser body temperature difference, the high-temperature and low-temperature heat source temperature difference, and the evaporator body temperature difference.

[0057] Figure 5 The diagram illustrates the pressure-enthalpy relationship of a refrigeration cycle, which is a schematic diagram of the refrigeration cycle. This is because the increase in the total heat exchange area of ​​the external heat exchangers of a refrigeration and air conditioning system leads to an increase in evaporation pressure, resulting in an increase in the heat absorbed by the refrigerant per unit mass, a decrease in compression work, an increase in COP, an increase in the refrigerant circulation volume, and an increase in the heat absorbed by the evaporator and the heat released by the condenser.

[0058] Figure 6 This is a vertical sectional view of the air conditioning unit structure (with air guide cover) in Example 2;

[0059] Figure 7 This is a vertical view of the air conditioning unit of Example 2 (without the air guide cover);

[0060] Figure 8 for Figure 7 The air inlet surface of the heat exchanger is a horizontal sectional view of three layers in an M-shape;

[0061] Figure 9 This is a schematic diagram of the refrigeration system principle of the air conditioning unit in Example 2;

[0062] Figure 10 This is a schematic diagram of the airflow operation of the air conditioning unit in Example 2;

[0063] Figure 11 This is a schematic diagram of the air conditioning unit structure equipped with a centrifugal fan in Example 2;

[0064] Figure 12 A three-dimensional structural diagram of the supplementary ventilation and air conditioning unit for Example 3;

[0065] Figure 13 This is another three-dimensional structural diagram of the supplementary ventilation and air conditioning unit for the side panel of Example 3;

[0066] Figure 14 This is a top view of the air conditioning unit structure with a W-shaped air inlet surface for the heat exchanger in Example 4.

[0067] Figure 15 This is a top view of the air conditioning unit structure with a W-shaped air inlet and outlet air duct on the side, as shown in Example 5.

[0068] Figure 16 This is a schematic diagram of the airflow of the air conditioning unit with a W-shaped air inlet surface for the heat exchanger in Example 5, showing the side-inlet and side-outlet airflow of the air duct.

[0069] Figure 17 This is a top view of the air conditioning unit structure with finned tube heat exchangers installed on both sides below the fan air inlet in Example 6;

[0070] Figure 18 This is a schematic diagram of the refrigeration system of the air conditioning unit with an intermediate heat exchanger in Example 7;

[0071] Figure 19 This is a schematic diagram showing the relationship between the air intake and exhaust areas on the exterior of the equipment platform. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments without creative effort are within the scope of protection of this application.

[0073] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0074] In the description of this invention, it should be understood that the terms "lateral", "longitudinal", "length", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0075] Definition: An external corridor-type equipment room platform, defined as the direction perpendicular to the external facade of the external corridor-type equipment platform as longitudinal, and the direction parallel to the external facade of the external corridor-type equipment platform as transverse.

[0076] Example 1

[0077] like Figure 1-2 As shown in the illustration, in one specific embodiment, the finned tube heat exchanger assembly consists of four flat-plate finned tube heat exchangers 37; or it consists of two continuously arranged V-shaped finned tube heat exchangers 40 with cross-sections perpendicular to the long side of the fins. The V-shaped finned tube heat exchanger 40 consists of two flat-plate finned tube heat exchangers 37.

[0078] like Figure 3 As shown, the flat plate finned tube heat exchanger includes finned plates 110 and heat exchange tubes 115; multiple parallel finned plates 110 with a certain distance between them form a fin group; and the heat exchange tubes 115 pass through the finned plates 110 in a direction perpendicular to the plane of the finned plates 110.

[0079] The cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fins is a broken line, or more specifically, a W-shaped section.

[0080] The long side of the fins in the flat plate finned tube heat exchanger 37 is set in the vertical direction or close to the vertical direction.

[0081] The apex angle α of the V-shaped finned tube heat exchanger is 15° to 110°.

[0082] As an optional implementation, the apex angle α of the V-shaped finned tube heat exchanger is 30° to 90°.

[0083] As an optional implementation, the apex angle α of the V-shaped finned tube heat exchanger is 30° to 60°.

[0084] like Figure 3 As shown, one side of the cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fins is the air inlet side of the heat exchanger, and the other side is the air outlet side of the heat exchanger; the air outlet side belongs to the negative pressure chamber area of ​​the heat exchanger assembly.

[0085] The incident surface of the inlet airflow is each flat finned tube heat exchanger in the finned tube heat exchanger assembly. The angle between the inlet airflow and the tip of each finned plate 110 on each flat finned tube heat exchanger 37 is an obtuse angle β. The obtuse angle β is 97.5° to 145°. The inlet airflow strikes the tip of each finned plate 110 in the finned tube heat exchanger assembly at an obtuse angle β, and is reflected by the fin tip plate into the fin gap and flows into the negative pressure chamber of the heat exchanger assembly.

[0086] The airflow rate entering each fin gap d is equal to the airflow intercepted by the vertical distance δ between the tips of the front and rear fin plates of the flat plate finned tube heat exchanger in the air inlet section.

[0087] δ=d·sinα / 2, where α is the apex angle of the V-shaped finned tube heat exchanger;

[0088] The vertical distance δ between the tips of the front and rear finned tube heat exchangers on the air inlet section is between 0.13d and 0.7d.

[0089] In one specific implementation, the airflow velocity between the fins is 1 / 3 of the inlet velocity, corresponding to a vertex angle α of 39° and an incident obtuse angle β of 109.5° for the V-shaped finned tube heat exchanger.

[0090] The core objective of optimizing refrigeration (heat pump) air conditioning units in different application scenarios remains "reducing condensing pressure and increasing evaporating pressure": reducing refrigeration condensing pressure can directly reduce the compressor's compression work; while increasing the heat pump heating evaporating pressure (evaporating temperature) means increasing the refrigerant circulation, increasing the evaporator's heat absorption, increasing the condenser's heat release, and reducing the compression ratio and compressor discharge temperature.

[0091] In this embodiment, evaporation pressure (evaporation temperature) is taken as the first factor of the refrigeration and air conditioning system. This is because evaporation pressure determines the density of the low-pressure refrigerant gas drawn into the compressor and the compressor's compression ratio. If the evaporation pressure of the heat exchanger (evaporator) of the heat pump air conditioner unit increases from 5 kg to 6 kg in winter, the system's refrigerant circulation, evaporator heat absorption, and condenser heat release will all increase by about 20% simultaneously, and the compressor's compression ratio and compressor discharge temperature will also drop accordingly.

[0092] This embodiment analyzes the relationship between the heat transfer capacity Q of finned tube heat exchangers such as air conditioner evaporators and condensers and the overall heat transfer coefficient K, heat transfer area S, and the heat transfer temperature difference Δt between refrigerant and air, expressed as Q = K × S × Δt. It proposes the technical judgment that "the key factors for improving the evaporation pressure of the current air conditioning unit, reducing the condensation pressure, improving the heat transfer capacity Q of the external heat exchanger of the air conditioning unit, and improving the COP of the refrigeration and air conditioning system lie in increasing the total heat transfer area S of the finned tube heat exchanger."

[0093] This embodiment increases the heat exchange capacity of the heat exchanger and improves the performance of the refrigeration and air conditioning system by expanding the heat exchange area of ​​the evaporator / condenser. Expanding the heat exchange area and reducing the heat exchange temperature difference are not only objective requirements for the iterative upgrade of heat exchangers, but also core requirements for the iterative upgrade of the large-scale refrigeration and air conditioning system constructed with the participation of heat exchangers.

[0094] like Figure 4 As shown, the difference between the condensing temperature and the evaporating temperature (T2-t2) of an air conditioning system is the fundamental factor determining the core indicator COP of the air conditioning system. A higher (T2-t2) will result in a lower COP, and vice versa. The COP of the air conditioning system is inversely related to the difference between the condensing temperature and the evaporating temperature (T2-t2). The difference between the condensing temperature and the evaporating temperature (T2-t2) is the sum of three temperature differences: the condenser body heat transfer temperature difference (T2-T1), the high-temperature heat source and the low-temperature heat source temperature difference (T1-t1), and the evaporator body heat transfer temperature difference (t1-t2). Therefore, given that the temperature difference (T1-t1) between the high-temperature heat source and the low-temperature heat source is an objective reality that cannot be changed, the innovative approach of this invention—expanding the heat exchange area S of the finned tube heat exchanger, reducing the heat transfer temperature difference (T2-T1) of the condenser body, and the heat transfer temperature difference (t1-t2) of the evaporator body—is the only way to reduce the difference between the condensing and evaporating temperatures (T2-t2) in the air conditioning heat pump system. This is also the only way to reduce the system's condensing pressure (condensing temperature), increase the system's evaporating temperature (evaporating pressure), increase the system's refrigerant circulation, increase the heat absorbed by the evaporator and the heat released by the condenser, and improve the COP of the refrigeration and air conditioning system.

[0095] like Figure 5 As shown, this invention reduces the body heat transfer temperature difference between the evaporator and condenser by increasing the total heat transfer area S of the finned tube heat exchanger, thereby increasing the evaporation pressure and decreasing the condensation pressure. This achieves the goals of increasing refrigerant circulation, evaporator heat absorption, condenser heat release, and the COP of the refrigeration system. The technical effect of increasing the total heat transfer area of ​​the external heat exchanger is particularly evident in the improvement of the evaporation temperature and evaporation pressure of the evaporator.

[0096] Evaporation pressure is the primary factor in heat pump systems, and its impact on the performance of refrigeration and heat pump systems is as follows: Figure 2 As shown (the vertical axis represents condensation pressure, the horizontal axis represents enthalpy, 1-2-3-4 in the figure represents the original circulation path, and 1-2-3'-4' represents the circulation path of this invention):

[0097] (1) The increase in evaporation pressure (P1→P1') directly leads to an increase in the heat absorbed by the refrigerant per unit mass in the refrigeration system (h4'-h4) and a decrease in the compressor's compression work (h4'-h4), thereby improving the energy efficiency ratio;

[0098] (2) The increase in evaporation pressure (P1→P1') also directly leads to an increase of approximately (P1' / P1-1)×100% in the refrigerant circulation of the fixed frequency heat pump system, resulting in an increase of approximately (P1' / P1-1)×100% in the heat absorption power of the evaporator and the heating power of the condenser.

[0099] (3) Increased evaporation pressure also directly leads to a decrease in compression ratio and a decrease in compressor exhaust temperature, effectively inhibiting the deterioration of lubricating oil and the degradation of compressor motor insulation performance.

[0100] When the finned tube heat exchanger assembly of the present invention is running, the microscopic process of airflow entering and exiting the fin gap and flowing at low speed in the fin gap is the central link in constructing the airflow field of the finned tube heat exchanger assembly.

[0101] At the airflow inlet section EE, the medium-speed airflow of about 4 m / s, which flows in from the outer facade 1 of the equipment platform, is propelled in a uniform laminar flow to the fin gap inlet section FF. At FF, the airflow line forms an obtuse angle β with the fin behind the gap. The fin behind the gap acts as a "planer," "planing" a piece of airflow from the main airflow and inserting it into the fin gap. At FF, the main airflow "planed" out by the tip of the "fin planer" is intercepted and impacts the tip of the "planer" on the fin behind the gap at an obtuse angle β. After being reflected by the fin in front of the gap, it diffuses and decelerates in the fin gap. The airflow of about 1.6 m / s, which is planed out by the "fin planer" and decelerated by collision diffusion, overcomes the resistance of the fin gap channel and flows out of the fin channel under the negative pressure of the negative pressure chamber. The low-speed airflow that reaches the fin gap outlet section GG is accelerated again to a medium-speed airflow of about 4 m / s under the negative pressure of the negative pressure chamber and converges and is discharged at the HH section.

[0102] Example 2

[0103] like Figure 6-10 As shown, an air conditioning unit using a zigzag finned tube heat exchanger includes a housing, a finned tube heat exchanger assembly as described in Example 1, an air conditioning compressor 121, a gas-liquid separator 126, and a fan 38.

[0104] The finned tube heat exchanger assembly is located on the air inlet 125 of the shell and forms a heat exchanger assembly negative pressure chamber 124 with part of the shell to connect the heat exchange air path.

[0105] Specifically, the bottom plate, side plate, back plate, top plate of the shell and the finned tube heat exchanger assembly are combined to form the negative pressure chamber 124 of the heat exchanger assembly;

[0106] The opening of the W-type finned tube heat exchanger assembly faces the negative pressure chamber 124 of the heat exchanger assembly.

[0107] The finned tube heat exchanger assembly is the air inlet of the negative pressure chamber 124 of the heat exchanger assembly.

[0108] An air outlet for the negative pressure chamber of the heat exchanger assembly is provided on the top plate at a location away from the finned tube heat exchanger assembly; a fan 38 is installed at the air outlet of the negative pressure chamber of the heat exchanger assembly.

[0109] Fan 38 is an axial flow fan.

[0110] like Figure 11 As shown, in another specific embodiment, the fan 38 is a backward-curved external rotor centrifugal fan. This embodiment uses a backward-curved external rotor centrifugal fan, which has the characteristics of high working static pressure and high operating efficiency. In scenarios where the airflow path of the air conditioning unit's finned tube heat exchanger assembly side is long and the friction resistance is large in some areas on the external corridor equipment platform, it can better meet the power requirements of the air conditioning unit's external heat exchanger air path.

[0111] The air outlet of the negative pressure chamber of the heat exchanger assembly is provided with an exhaust chamber 33, and the exhaust port 331 of the exhaust chamber 33 is located on the same side as the air inlet 125 of the shell.

[0112] The exhaust port 331 of the exhaust cavity 33 faces the short side of the air conditioner unit housing.

[0113] The area below the air outlet of the negative pressure chamber 124 of the heat exchanger assembly, adjacent to the back plate, is a ventilation blind zone; the refrigerant circuit components, including the air conditioning compressor 121, gas-liquid separator 126, four-way valve 137, expansion valve, electrical box, etc., are located in the ventilation blind zone inside the negative pressure chamber 124 of the heat exchanger assembly.

[0114] In this embodiment, the air conditioning unit is applicable to scenarios where the location of the air conditioning unit is changed from an open outdoor platform to a semi-enclosed equipment platform under the conditions of a building distributed energy system; the air inlet and outlet fields of the air conditioning unit are changed from a classic hemispherical three-dimensional open space to a semi-enclosed outer corridor equipment platform with one side open.

[0115] In this embodiment, the air conditioning unit innovates its design by increasing the total ventilation area of ​​the external heat exchanger, the total fin area, and reducing the heat transfer temperature difference of the external heat exchanger in the aforementioned semi-enclosed external corridor equipment platform scenario.

[0116] ① Innovative host structure design

[0117] In this embodiment, a finned tube heat exchanger assembly is constructed inside the air conditioning unit along the direction of the parallel air inlet air inlet. The finned tube heat exchanger assembly is set close to the air inlet and exhaust outlet of the air conditioning unit, and the main sections of the air inlet and exhaust channels of the finned tube heat exchanger assembly are incorporated into the air conditioning unit.

[0118] This invention involves arranging at least one horizontal V-shaped finned tube heat exchanger parallel to the air inlet of the air conditioning unit within the limited space of the air conditioning unit. The finned tube heat exchanger assembly is then expanded along the air inlet surface of this first horizontal V-shaped finned tube heat exchanger to obtain a large ventilation surface. A second expansion is then made on this large ventilation surface to obtain a huge finned heat transfer surface, thereby effectively increasing the total finned heat transfer area S of the air conditioning unit's finned tube heat exchanger assembly, reducing the heat transfer temperature difference Δt of the heat exchanger body, increasing evaporation pressure and reducing condensation pressure, and improving the Q and COP of the air conditioning system.

[0119] In this embodiment, at least one negative pressure chamber for the heat exchanger assembly is provided. The negative pressure chamber for the heat exchanger assembly is composed of a bottom plate, a side plate, a back plate, a finned tube heat exchanger assembly, and a top plate. The top plate is provided with an air outlet for the negative pressure chamber 124 of the heat exchanger assembly, and a fan is installed at the air outlet. The horizontally continuous horizontal V-shaped finned tube heat exchangers are the air inlets for the negative pressure chamber 124 of the heat exchanger assembly.

[0120] An exhaust chamber is set above the top plate of the negative pressure chamber 124 of the heat exchanger assembly. The air inlet of the exhaust chamber is the air outlet of the negative pressure chamber 124 of the heat exchanger assembly, which is where the fan is located. The exhaust outlet of the exhaust chamber is set on the same side as the air inlet of the air conditioning unit. The air inlet of the exhaust chamber is connected to the continuously arranged horizontal V-shaped heat exchanger assembly negative pressure chamber fan exhaust outlet.

[0121] The back plate and bottom plate of the negative pressure chamber 124 of the heat exchanger assembly are ventilation blind spots, where the air conditioning compressor, four-way valve, expansion valve, electrical box and other refrigerant circuit components are installed.

[0122] ② Innovative design of the air conditioning unit's external heat exchanger inlet and outlet airflow.

[0123] In this embodiment, the exhaust chamber of the air conditioning unit is set up in the unused space at the top of the equipment platform. The exhaust port of the exhaust chamber is set on the same side and above the air inlet of the air inlet channel, and the area of ​​the exhaust port is significantly smaller than that of the air inlet. The air inlet and outlet of the air conditioning unit are directly connected to the air inlet and outlet on the outer facade 1 of the equipment platform, creating the air inlet and outlet air field of the external heat exchanger of the air conditioning unit with the shortest air inlet and outlet path and the highest air pressure gradient. This creates conditions for eliminating the inefficient space of the traditional longitudinal and transverse air supply ducts on the air conditioning unit equipment platform.

[0124] In this embodiment, the airflow field of the air conditioning unit's finned tube heat exchanger assembly is established by the operation of a fan: the fan draws air from the negative pressure chamber of the heat exchanger assembly to generate negative pressure inside the chamber, which pulls the ambient air into the air conditioning unit from the air inlet at a medium speed. The air then disperses and slows down, flowing at a low speed through the gaps between the heat exchanger fins to complete heat exchange before entering the negative pressure chamber. The air then converges and accelerates to flow into the fan's air inlet, where the pressure is lowest, and is finally pressurized by the fan and discharged at high speed through the exhaust chamber.

[0125] In this embodiment, when the air conditioning unit is running, the microscopic process of the incoming airflow entering multiple fin gaps and flowing at low speed in the fin gaps under the step-by-step planing of multiple fins of the finned tube heat exchanger assembly is the central link of the air inlet and outlet field of the finned tube heat exchanger assembly.

[0126] ③ Innovative design of refrigeration circuit

[0127] In this embodiment, the air conditioning unit houses the compressor, four-way valve, expansion valve, gas-liquid separator, and other refrigeration circuit components, as well as power cables, signal lines, and electrical boxes, in the ventilation blind zone of the negative pressure chamber of the heat exchanger assembly. These refrigeration circuit components, together with the external heat exchanger, refrigerant connection pipes, and indoor unit heat exchanger, form a refrigeration and air conditioning circulation loop in the sequence of compressor-four-way valve-condenser-expansion valve-evaporator-four-way valve-gas-liquid separator-compressor. The compressor, acting as the power source for the refrigeration cycle, establishes high and low pressure states for the refrigerant in the condenser and evaporator pipes, respectively. This drives the refrigerant to circulate and undergo repeated phase changes within the refrigeration cycle to achieve "heat transfer." Specifically, the refrigerant liquid absorbs heat through evaporation within the evaporator pipes, and then absorbs heat from the low-temperature ambient air flowing between the fins through the large heat-absorbing area S of the copper tubes. Conversely, the high-temperature, high-pressure refrigerant gas releases heat through condensation within the condenser pipes, and then releases heat to the high-temperature ambient air flowing between the fins through the large heat-releasing area S of the copper tubes. This process achieves the migration of heat from the low-temperature environment where the air conditioner evaporator is located to the high-temperature environment where the condenser is located.

[0128] like Figure 19 As shown, when the air conditioning unit is running in this embodiment, the external airflow enters the unit at a medium speed of about 4m / s. Under the action of the "multiple fin planers" in the V-shaped finned tubes inside the air conditioning unit, the airflow slows down and disperses. It passes through the external heat exchanger, which has a large total ventilation surface and a huge total heat exchange area S, at a low speed of about 1.6m / s with low resistance. After heat exchange, it flows into the negative pressure chamber and converges towards the fan intake under the negative pressure traction of the external heat exchanger fan. After being pressurized by the fan, it is finally discharged from the exhaust chamber at a high speed of about 8m / s.

[0129] Example 3

[0130] like Figure 12-13 As shown, the air conditioning unit of this embodiment is similar to that of embodiment 1. Furthermore, the side plate at the air inlet 125 of the housing is also provided with several through holes 138 for supplementing air intake to the finned tube heat exchanger; the through holes 138 and the air inlet 125 of the housing constitute the air intake channel of the finned tube heat exchanger assembly.

[0131] An elevation bracket 136 for mounting the finned tube heat exchanger is provided inside the housing. The finned tube heat exchanger assembly is mounted on the elevation bracket 136.

[0132] The increased space created by the heightened support also forms the bottom air inlet channel 135 of the finned tube heat exchanger assembly.

[0133] A water collection tank 123 is provided at the bottom of the finned tube heat exchanger.

[0134] Fan 38 is an axial flow fan.

[0135] The side plate through-hole in this embodiment solves the problem that the two outer finned tube heat exchangers are at a ventilation disadvantage compared to the two inner finned tube heat exchangers when viewed from the air inlet inwards. The side plate through-hole in this embodiment can make up for the ventilation disadvantage of the two outer finned tube heat exchangers.

[0136] Example 4

[0137] like Figure 14 As shown, the air conditioning unit in this embodiment is similar to that in embodiment 1, except that the opening of the W-type finned tube heat exchanger assembly faces the air inlet 125 of the housing.

[0138] The V-shaped finned tube heat exchanger with the lotus head air collecting pipe 133 as its apex faces outward and connects to the air intake on the exterior facade;

[0139] The side plates (i.e., the side plates of the negative pressure chamber 124 of the heat exchanger assembly) of the continuously arranged V-shaped finned tube heat exchangers (i.e., W-shaped finned tube heat exchanger assemblies) are closed and airtight, with air intake only uniformly organized on the air inlet side. The ventilation conditions of the four flat finned tube heat exchangers are balanced and consistent, achieving uniform ventilation. The lotus-head air collecting pipes 133 at each V-shaped apex correspond one-to-one with the V-shaped finned tube heat exchangers. One set of lotus-head air collecting pipes 133 serves two flat finned heat exchangers in the V-shape. Compared with Example 1, the number of lotus-head air collecting pipes 133 required for the continuously arranged V-shaped finned tube cluster is reduced.

[0140] Example 5

[0141] like Figure 15-16 As shown, an air conditioning unit using a zigzag finned tube heat exchanger includes a housing, a finned tube heat exchanger assembly as described in Example 1, an air conditioning compressor 121, a gas-liquid separator 126, and a fan 38; the finned tube heat exchanger assembly is located on the air inlet 125 of the housing and forms a heat exchanger assembly negative pressure chamber 124 with part of the housing to communicate with the heat exchange air path.

[0142] Specifically, the bottom plate, side plate, back plate, top plate of the shell and the finned tube heat exchanger assembly are combined to form the negative pressure chamber 124 of the heat exchanger assembly;

[0143] like Figure 15 As shown, the opening of the W-type finned tube heat exchanger assembly faces the air inlet surface of the shell air inlet 125.

[0144] The finned tube heat exchanger assembly is the air inlet of the negative pressure chamber 124 of the heat exchanger assembly.

[0145] The air outlet of the negative pressure chamber 124 of the heat exchanger assembly is provided on the back plate of the negative pressure chamber 124 (or shell).

[0146] A fan 38 is installed at the air outlet of the negative pressure chamber 124 of the heat exchanger assembly.

[0147] Fan 38 is an axial flow fan.

[0148] The air outlet of the negative pressure chamber 124 of the heat exchanger assembly is provided with an exhaust chamber 33, and the exhaust port 331 of the exhaust chamber 33 is located on the same side as the air inlet 125 of the shell.

[0149] The exhaust port 331 of the exhaust cavity 33 faces the short side of the air conditioner unit housing.

[0150] The refrigerant circuit assembly, including the air conditioning compressor 121, gas-liquid separator 126, four-way valve 137, expansion valve, electrical box, etc., is located in the compressor cavity on the outside side of the negative pressure cavity of the housing.

[0151] In this embodiment, the axial flow fan is installed in the vertical plane of the back panel, and the air intake faces the horizontally continuously arranged V-shaped finned tube heat exchangers. A compressor chamber is located on the horizontal side of the finned tube heat exchanger assembly, housing the compressor electrical box and other refrigerant circuit components. This allows the air conditioning unit of this embodiment to be suitable for more application scenarios, such as:

[0152] ① The air conditioning unit is mounted on the exterior of the building, with the air intake facing the exterior facade 1, leaving an air intake gap between the unit and the facade, and the exhaust vent facing outward, with side intake and side exhaust.

[0153] ② Install the air conditioning unit in reverse on the equipment platform, that is, with the air intake of the air conditioning unit facing inward and the exhaust outlet of the fan facing outward, so as to directly exhaust air to the external facade.

[0154] Example 6

[0155] like Figure 17 As shown, the air conditioning unit in this embodiment is similar to that in embodiment 1, except that the negative pressure chamber 124 of the heat exchanger assembly is composed of the bottom plate, back plate, top plate of the shell, finned tube heat exchanger assembly, and two flat plate finned tube heat exchanger groups 37 as side plates.

[0156] In this embodiment, in addition to the continuous arrangement of multiple horizontal V-shaped finned tube heat exchangers 40 parallel to the air inlet 125 of the air conditioning unit, flat plate finned tube heat exchangers 37 are also arranged on both sides of the long side below the suction inlet of the fan 38. The finned tube heat exchanger assembly has a larger ventilation and heat exchange area and a higher energy density of the air conditioning unit.

[0157] Example 7

[0158] like Figure 18 As shown, an air conditioning system consisting of an air conditioning unit with a zigzag finned tube heat exchanger includes any one of the air conditioning units in Examples 2 to 6, an intermediate heat exchanger 139, a water circuit, and a water pump.

[0159] The two heat exchange medium channels of the intermediate heat exchanger are the refrigerant channel of the air conditioning unit and the air conditioning water channel, respectively; the refrigerant channel is connected to the refrigerant circuit 134 of the air conditioning unit; the air conditioning water channel is connected to the indoor heat exchanger 127.

[0160] Intermediate heat exchangers include plate heat exchangers, shell-and-tube heat exchangers, coaxial heat exchangers, or combinations of plate heat exchangers, shell-and-tube heat exchangers, and coaxial heat exchangers.

[0161] As a specific embodiment, the plate heat exchanger 139, water circuit and water pump are installed inside the negative pressure chamber 124 of the heat exchanger assembly of the air conditioning unit.

[0162] As a specific embodiment, the plate heat exchanger 139, water circuit, and water pump are installed inside the compressor cavity on the outside side of the negative pressure cavity of the air conditioning unit casing.

[0163] In one specific embodiment, the plate heat exchanger, 139 water circuit, and water pump are installed outside the air conditioning unit and connected to the air conditioning unit through the heat exchange medium channel.

[0164] In this embodiment of the air conditioning system, the air conditioning unit is connected to the plate heat exchanger 139 and the water pump, etc. The two heat exchange medium channels of the plate heat exchanger 139 are the refrigerant channel and the air conditioning water channel, respectively. The air conditioning unit produces chilled water (hot water) through the plate heat exchanger and delivers it to the indoor air conditioning unit in the building for indoor air cooling and dehumidification (heating).

[0165] In addition to having all the advantages of Embodiment 1, this embodiment eliminates the risk of refrigerant leakage and accumulation inside the building by adding a plate heat exchanger to the air conditioning unit to output air conditioning water to the indoor unit inside the building and isolating the refrigerant on the external corridor equipment platform. This creates conditions for the air conditioning unit to use environmentally friendly refrigerants such as R290, which have zero greenhouse effect and zero ozone layer depletion effect but are flammable.

[0166] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An air conditioning unit employing a zigzag-shaped finned tube heat exchanger, characterized in that, The air conditioning unit includes a housing, and the finned tube heat exchanger assembly is composed of at least two flat plate finned tube heat exchangers; or it is composed of a V-shaped finned tube heat exchanger formed by bending flat plate finned tube heat exchangers; or it is composed of a flat plate finned tube heat exchanger and the V-shaped finned tube heat exchanger formed by bending flat plate finned tube heat exchangers. The cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fins is a broken line type; The long side of the fins of the flat plate finned tube heat exchanger is set in the vertical direction in the horizontal air duct. The finned tube heat exchanger assembly is located on the air inlet surface of the air inlet of the air conditioning unit, and together with the bottom plate, side plate, back plate and top plate of the housing, forms a heat exchanger assembly negative pressure chamber that connects the heat exchange air path. The finned tube heat exchanger assembly has one side of the cross-section perpendicular to the long side of the fins as the air inlet side and the other side as the air outlet side; the air outlet side belongs to the negative pressure chamber area of ​​the heat exchanger assembly. The finned tube heat exchanger assembly is the air inlet of the negative pressure chamber of the heat exchanger assembly. The back plate or top plate is provided with an air outlet for the negative pressure chamber of the heat exchanger assembly; The incident surface of the inlet airflow is each flat finned tube heat exchanger in the finned tube heat exchanger assembly, and the angle between the inlet airflow and the tip of each finned plate on each flat finned tube heat exchanger is an obtuse angle; the obtuse angle β is 97.5°~145°. The incoming airflow impacts the tip of each fin plate in the finned tube heat exchanger assembly at an obtuse angle β, and is reflected by the fin tip plate into the fin gap and flows into the negative pressure chamber of the heat exchanger assembly. The airflow rate entering each fin gap d is equal to the airflow intercepted by the vertical distance δ between the tips of the front and rear fin plates of the flat plate finned tube heat exchanger in the air inlet section. δ=d·sinα / 2, where α is the apex angle of the V-shaped finned tube heat exchanger.

2. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 1, characterized in that, The finned tube heat exchanger assembly has a V-shaped or N-shaped cross-section perpendicular to the long side of the fins, or is composed of at least two finned tube heat exchangers with a V-shaped cross-section perpendicular to the long side of the fins arranged continuously.

3. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 2, characterized in that, The cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fins is W-shaped.

4. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 2, characterized in that, The apex angle α of the V-shaped finned tube heat exchanger is 15° to 110°.

5. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 1, characterized in that, The vertical distance δ between the tips of the front and rear finned tube heat exchangers on the air inlet section is between 0.13d and 0.7d.

6. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 1, characterized in that, The airflow velocity between the fins is 1 / 3 of the inlet velocity, corresponding to a vertex angle α of 39° and an incident obtuse angle β of 109.5° for the V-shaped finned tube heat exchanger.

7. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 1, characterized in that, This includes air conditioning compressors, gas-liquid separators, and fans.

8. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 7, characterized in that, An air outlet for the negative pressure chamber of the heat exchanger assembly is provided on the top plate at a distance away from the finned tube heat exchanger assembly; a fan is provided at the air outlet of the negative pressure chamber of the heat exchanger assembly.

9. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 8, characterized in that, The air outlet of the negative pressure chamber of the heat exchanger assembly is provided with an exhaust chamber, and the exhaust port of the exhaust chamber is located on the same side as the air inlet of the shell.

10. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 9, characterized in that, The exhaust port of the exhaust chamber faces the short side of the air conditioner unit housing.

11. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 7, characterized in that, The area below the air outlet of the negative pressure chamber of the heat exchanger assembly, adjacent to the back plate, is a ventilation blind zone; the refrigerant circuit components, including the air conditioning compressor, gas-liquid separator, four-way valve, expansion valve, and electrical box, are located in the ventilation blind zone inside the negative pressure chamber of the heat exchanger assembly. The gas-liquid separator, air conditioning compressor, four-way valve, heat exchanger assembly, expansion valve, and refrigerant pipeline of the indoor unit of the air conditioner are connected in sequence to form the refrigerant circulation loop of the air conditioning system.

12. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 7, characterized in that, The compressor chamber (332) includes an air conditioning compressor, a gas-liquid separator, a four-way valve, an expansion valve, and a refrigerant circuit assembly of an electrical box, which is located on the side outside the negative pressure chamber of the heat exchanger assembly in the housing.

13. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 8, characterized in that, The two side plates of the negative pressure chamber of the heat exchanger assembly are replaced with the flat plate finned tube heat exchanger.

14. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 7, characterized in that, The side plate at the air inlet of the shell is provided with several through holes for supplementing air into the finned tube heat exchanger; the through holes and the air inlet of the shell constitute the air inlet channel of the finned tube heat exchanger assembly.

15. The air conditioning unit using a zigzag finned tube heat exchanger according to claim 7, characterized in that, The fan is either an axial flow fan or a centrifugal fan.

16. The air conditioning unit employing a zigzag-shaped finned tube heat exchanger according to claim 7, characterized in that, A heightening bracket (136) for mounting a finned tube heat exchanger is provided inside the housing; the finned tube heat exchanger assembly is mounted on the heightening bracket (136); The space expanded by the heightened bracket forms the bottom air inlet channel (135) of the finned tube heat exchanger assembly.

17. An air conditioning system comprising an air conditioning unit using a zigzag finned tube heat exchanger as described in any one of claims 7 to 16.

18. The air conditioning system according to claim 17, characterized in that, It includes an air conditioning unit, an intermediate heat exchanger, a water circuit, and a water pump; the two heat exchange medium channels of the intermediate heat exchanger are the refrigerant channel of the air conditioning unit and the air conditioning water channel, respectively; the refrigerant channel is connected to the refrigerant circuit of the air conditioning unit; the air conditioning water channel is connected to the indoor heat exchanger.

19. The air conditioning system according to claim 18, characterized in that, The intermediate heat exchanger includes a plate heat exchanger, a shell-and-tube heat exchanger, a coaxial heat exchanger, or a combination of plate heat exchangers, shell-and-tube heat exchangers, and coaxial heat exchangers.

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