Air conditioner main unit with three-dimensional air supply and equipment platform thereof

Abstract

The present application belongs to the technical field of air conditioning and building design, and more particularly relates to a three-dimensional air supply air conditioner host and equipment platform. The air conditioner host comprises a finned tube heat exchanger assembly, a shell, an air conditioner compressor, a gas-liquid separator and a fan; the finned tube heat exchanger assembly comprises at least two finned tube heat exchangers, the finned tube heat exchanger comprises a horizontal C-shaped finned tube heat exchanger and / or a vertical V-shaped finned tube heat exchanger; all the finned tube heat exchangers of the finned tube heat exchanger assembly are connected with the same air conditioner compressor. At least one air conditioner host is arranged in the equipment platform in the transverse direction; the equipment platform is provided with an outer facade for ventilation, and the air inlet and air distribution channel of the air conditioner host is close to the outer facade; the air conditioner host is provided with an air outlet chamber above, and the air outlet of the air outlet chamber is arranged and / or close to the outer facade. The present application constructs an air conditioner host high-efficiency heat exchange air path structure to improve the energy density; facilitates the detection and maintenance of the air conditioner host; and realizes the construction of a side-in and side-out air path structure of the outer facade of the equipment platform.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning and building design technology, and more specifically, relates to a three-dimensional air supply air conditioning unit and its equipment platform. Background Technology

[0002] Currently, multi-split air conditioning units, air-cooled water chiller modules, and other "top-discharge" air conditioning units, as well as the relationship between the unit and the building structure, are still "two separate entities." The air conditioning unit is still the same unit, and the equipment platform is still a traditional external corridor structure. Only the spatial displacement of the air conditioning unit has been implemented. Neither has adapted to the structural relationship requirements of the building's distributed energy system, resulting in a series of problems such as obstructed airflow in the air conditioning unit, reduced energy efficiency of the cooling system, excessive space occupied by air intake and exhaust channels, unreasonable use of space on the equipment platform, reduced power density, and increased footprint of the unit.

[0003] The existing modular air-supply air conditioner for computer rooms (CN111561738A) discloses a system comprising a frame, a fan, a compressor, and an evaporator. The evaporator divides the frame into an upper air outlet zone and a lower air inlet zone. The front end of the upper air outlet zone has a first electrical control box for housing electrical control components. The first electrical control box is connected to the air guide baffle and the evaporator to form the upper air outlet zone. This patented modular air-supply air conditioner for computer rooms integrates the fan, electrical control components, compressor, and evaporator into a single chamber. This patent primarily achieves higher heat exchange efficiency by reducing the number of separate compressor or electrical control compartments, thus reducing the overall width of the unit and achieving the same unit floor space. However, this patent fails to improve the energy density by optimizing the efficient heat exchange airflow structure of the air conditioning unit.

[0004] As the global greenhouse effect worsens, the cooling load per unit building area in the HVAC design of high-rise and super high-rise buildings is increasing. In the Yangtze River Basin, it even exceeds 200W / ㎡. Due to the increase in building heat load and the decentralized and localized nature of air conditioning units under the concept of distributed air conditioning systems, idle air conditioning resources cannot be accessed across areas or floors within the building. If the cooling power density of the main air conditioning room remains at a low level of 11.6kw / ㎡, then the cooling capacity of each 1㎡ air conditioning main air conditioning room can only meet the cooling needs of 58㎡ of building area. The area of ​​the air conditioning main air conditioning room in the total building area rises to 1.7%, which significantly exceeds the requirements of the current building HVAC design code.

[0005] In summary, existing "top-discharge" commercial central air conditioning units, such as multi-split systems and air-cooled water chiller modules, as well as the structural relationship between these units and the external corridor-style equipment platform, still present many technical challenges, including:

[0006] First, the energy density of the air conditioning unit platform is low. After multiple structural optimizations and energy efficiency improvements, the power density of the existing air conditioning units, calculated based on their floor area, has exceeded 40 kW / ㎡, while the power density of the existing air conditioning unit platform is only 11.6 kW / ㎡. This means that the floor area occupied by the air conditioning unit's air inlet and outlet ducts, maintenance passages, and ventilation blind spots on the platform is more than 2.4 times the area of ​​the air conditioning unit itself. The excessive floor area occupied by the existing air conditioning unit platform, generally exceeding 1.5% of the total building area, has become a prominent problem in building HVAC design.

[0007] Secondly, there is the problem of equipment platforms occupying excessive horizontal width of the building facade. Currently, the air intake and exhaust structures of air conditioning units and equipment platforms are unreasonable, and the utilization rate of depth and top space is low, resulting in equipment platforms occupying excessive horizontal width of the building facade. In existing high-rise buildings, equipment floors are set approximately every 12 floors, with the surrounding corridors entirely occupied by the air conditioning unit's intake and exhaust vents. The width of the building facade is a crucial resource second only to the building area in the building's performance indicators. In high-rise and super high-rise buildings, the competition for facade width by air conditioning unit equipment platforms, resulting in excessive horizontal width occupation, obstructs visual communication between the interior space and the external environment on the same floor, and has become a prominent issue in building HVAC design.

[0008] Thirdly, there is the problem of uneven vertical ventilation in the external heat exchanger. Summary of the Invention

[0009] To address the aforementioned technical problems, this invention provides a three-dimensional air supply air conditioning unit.

[0010] Another objective of this invention is to provide an air conditioning unit platform.

[0011] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0012] A three-dimensional air conditioning unit includes a finned tube heat exchanger assembly, a housing, an air conditioning compressor, a gas-liquid separator, and a fan;

[0013] The finned tube heat exchanger assembly includes at least two finned tube heat exchangers, which include a horizontal C-type finned tube heat exchanger and / or a vertical V-type finned tube heat exchanger.

[0014] All refrigerant lines of the finned tube heat exchanger assembly are connected to the same air conditioning compressor.

[0015] Furthermore, at least two finned tube heat exchangers are arranged along the long side inside the shell; wherein, the front finned tube heat exchanger near the air inlet is a vertical V-shaped finned tube heat exchanger; and the rear finned tube heat exchanger is a horizontal C-shaped finned tube heat exchanger.

[0016] Furthermore, a heightening bracket for installing a finned tube heat exchanger is provided at the bottom of the housing;

[0017] The space expanded by the heightening bracket at the lower part of the front-mounted finned tube heat exchanger inside the housing and the middle and lower parts of the horizontal sides of the vertical V-shaped finned tube heat exchanger constitute the air intake and distribution channel of the air conditioning unit.

[0018] Furthermore, the pre-positioned finned tube heat exchanger consists of two vertical V-shaped finned tube heat exchangers; the two vertical V-shaped finned tube heat exchangers are connected to form a negative pressure chamber; or, each vertical V-shaped finned tube heat exchanger forms an independent negative pressure chamber; preferably, the two vertical V-shaped finned tube heat exchangers have different vertical heights.

[0019] Furthermore, the air conditioning compressor and the gas-liquid separator are located at the bottom of the negative pressure chamber of the rear finned tube heat exchanger or in the lower space outside the negative pressure chamber.

[0020] Furthermore, a fan is installed at the top of the negative pressure chamber of the finned tube heat exchanger; an exhaust chamber connected to the housing is provided above the fan; preferably, the exhaust port of the exhaust chamber faces the short side of the air conditioning unit housing.

[0021] Furthermore, the fan is an axial flow fan or a centrifugal fan.

[0022] An air conditioning unit platform is provided, wherein at least one air conditioning unit is arranged horizontally within the platform; the platform has an exterior facade for ventilation, and the air inlet and distribution channel of the air conditioning unit is close to the exterior facade; an exhaust chamber is provided above the air conditioning unit, and the exhaust port of the exhaust chamber is located and / or close to the exterior facade.

[0023] Furthermore, the exhaust area on the exterior facade corresponds to the exhaust port of the air conditioning unit, and the air inlet area on the exterior facade corresponds to the air inlet of the air conditioning unit.

[0024] Furthermore, the exhaust zones on the facade are continuously arranged in the upper part of the facade, and the air intake zones on the facade are continuously arranged in the middle and lower parts of the facade. Preferably, the boundary between the exhaust zones and the air intake zones on the facade is a horizontal straight line or a boundary line that is close to a horizontal straight line.

[0025] Furthermore, the area of ​​the exhaust zone on the facade is 25% to 50% of the facade area used for ventilation.

[0026] Furthermore, the back panel of the air conditioning unit and the inner wall of the equipment platform form a three-in-one passage for pedestrians, maintenance, and installation of copper pipes and cable trays for the air conditioning system.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] ① Construct an efficient heat exchange airflow structure for the air conditioning unit to improve energy density

[0029] This invention's air conditioning unit 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 inside the air conditioning unit. This invention uses horizontal C-type and vertical V-type finned tube heat exchangers as basic heat exchanger units to construct the air conditioning unit's finned tube heat exchanger assembly. Within the limited space of the air conditioning unit, multiple horizontal C-type and vertical V-type finned tube heat exchangers are arranged. A large area of ​​heat exchanger ventilation surface is expanded along the finned air intake surface of these multiple horizontal C-type and vertical V-type finned tube heat exchangers. A large area of ​​finned heat transfer surface is then further expanded on this large area of ​​ventilation 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, increasing evaporation pressure and reducing condensation pressure, thus constructing a heavy-duty air conditioning unit.

[0030] In this invention, the external airflow of the air conditioning unit enters the air conditioning unit at a medium speed of about 4m / s. Inside the unit, the airflow slows down and disperses, passing through multiple finned tube external heat exchangers with a low speed and low resistance of less than 1.6m / s. These heat exchangers have a large total ventilation cross-section and a huge total heat exchange area S. After heat exchange, the airflow 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 accelerated and pressurized by the fan, the airflow is finally discharged from the exhaust chamber at a high speed of about 8m / s.

[0031] The present invention adopts the above-mentioned aerodynamic layout and airflow structure. In the chain process of medium-speed airflow inlet → dispersed deceleration → heat exchange on the huge fin heat exchange area S on the total huge ventilation surface → convergence acceleration → fan pressurization → high-speed discharge, the airflow takes the fan as the power source, the negative pressure chamber as the core, and the huge heat exchanger fins as the lowest speed zone. It completes one fan pressurization and two static pressure-dynamic pressure conversions before and after the fan. It is efficient and smooth, and constructs an efficient heat exchange airflow structure inside the air conditioning unit.

[0032] The invention provides a large number of horizontal C-shaped finned tube heat exchangers and vertical V-shaped finned tube heat exchanger negative pressure chambers arranged along the long side of the air conditioning unit. This provides a large number of heat exchange fins for the air conditioning unit's finned tube heat exchanger assembly, while also effectively controlling the unit's volume and improving the energy density of the air conditioning unit, thus preparing the prerequisites for improving the energy density of the equipment platform.

[0033] ② Facilitate air conditioner unit inspection and repair

[0034] This invention features multiple horizontal C-shaped finned tube heat exchangers and vertical V-shaped finned tube heat exchanger negative pressure chambers along its long side. The compressor, gas-liquid separator, four-way valve, expansion valve, electrical box, and other refrigerant circuit components are centrally located within the horizontal C-shaped finned tube heat exchanger negative pressure chamber, in the lower-middle ventilation blind zone near the back plate. The vertical V-shaped finned tube heat exchanger negative pressure chamber adjacent to the air inlet and outlet has no moving refrigerant circuit components. Furthermore, the back plate of the horizontal C-shaped finned tube heat exchanger negative pressure chamber is located on the short side of the main unit, and when installed on the equipment platform, the back plate of the C-shaped finned tube heat exchanger negative pressure chamber faces the maintenance passage on the inner side of the platform.

[0035] The components that may malfunction in an air conditioning unit are usually 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, and sensors. The structural design of the air conditioning unit in this invention facilitates inspection and maintenance: when a malfunction occurs, the back plate of the negative pressure chamber of the horizontal C-shaped finned tube heat exchanger can be opened through the maintenance channel on the inside of the platform. The refrigerant circuit components that may malfunction, such as the compressor, four-way valve, expansion valve, and electrical box, are clearly visible, making inspection and maintenance very convenient and solving the inherent inspection and maintenance problems of air conditioning units.

[0036] ③ This created conditions for constructing a side-inlet, side-outlet airflow structure to complement the exterior facade of the equipment platform.

[0037] 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.

[0038] This invention addresses the practical application scenario of central air conditioning unit design, where the height of the finned tube heat exchanger is limited to approximately 1.2m and the overall height of the unit to approximately 1.7m to control the vertical unevenness of ventilation in the external heat exchanger, and where the net height of the equipment floor in high-rise and super high-rise buildings where the central air conditioning unit is installed reaches more than 4m. It establishes an aerodynamic layout of "medium-speed air intake in the lower part of the unit, high-speed exhaust in the top exhaust chamber, with the air inlet and exhaust ports facing the same direction and side, and the ratio of air intake area to exhaust area approximately 2:1". An "exhaust chamber" with an exhaust cross-sectional area approximately half that of the air intake surface is set at the top of the negative pressure chambers of multiple external heat exchangers along the long side, utilizing the unused space at the top of the equipment platform. This invention is not only compact in structure, but the symmetrical, side-mounted, and vertically arranged air inlet and exhaust ports of the air conditioning unit also prepares the conditions for installation on the equipment platform adjacent to the exterior facade, and for constructing a side-inlet / side-outlet air path structure for the air conditioning unit in conjunction with the exterior facade of the equipment platform.

[0039] Under the design concept of air conditioner unit air intake area: exhaust area ≈ 2:1, the exhaust speed reaches 2 times the intake speed and the exhaust dynamic pressure head reaches 4 times the intake dynamic pressure head. This effectively improves the exhaust speed and kinetic energy of the air conditioner unit's external heat exchanger, and effectively improves the range and diffusion dilution effect of the air conditioner unit's exhaust jet penetrating the outer facade of the equipment platform and entering the ambient atmosphere. Attached Figure Description

[0040] Figure 1 This diagram illustrates the total temperature difference between the condenser and evaporator in a refrigeration and air conditioning system, which is the sum of the three temperature differences: the condenser heat transfer temperature difference, the high-temperature and low-temperature heat source temperature difference, and the evaporator heat transfer temperature difference.

[0041] Figure 2 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.

[0042] Figure 3 This is a schematic diagram of the horizontal C-type and vertical V-type finned tube heat exchanger assembly used in the air conditioning unit of Example 1.

[0043] Figure 4 This is a perspective view of the air conditioning unit of Example 1, which uses a horizontal C-type and vertical V-type finned tube heat exchanger assembly.

[0044] Figure 5 This is a side view of the air conditioning unit of Example 1, which uses a horizontal C-type and vertical V-type finned tube heat exchanger assembly.

[0045] Figure 6 for Figure 5 A schematic diagram of the four horizontal sections;

[0046] Figure 7 This is a schematic diagram of the refrigeration system of the air conditioning unit using a horizontal C-type and vertical V-type finned tube heat exchanger assembly in Example 1.

[0047] Figure 8 This is a vertical cross-sectional view of the airflow of the air conditioning unit using a horizontal C-type and vertical V-type finned tube heat exchanger assembly in Example 1.

[0048] Figure 9 This is a horizontal cross-sectional view of the airflow of the air conditioning unit using a horizontal C-type and vertical V-type finned tube heat exchanger assembly in Example 1.

[0049] Figure 10 This is a side view of the air conditioning unit with three independent negative pressure chambers in Example 2;

[0050] Figure 11 for Figure 10A schematic diagram of the four horizontal sections;

[0051] Figure 12 This is a vertical sectional view of the airflow during operation of the air conditioning unit with three independent negative pressure chambers in Example 2;

[0052] Figure 13 This is a side view of the air conditioning unit of Example 3, which has two vertical V-shaped and one horizontal C-shaped negative pressure chambers of different sizes.

[0053] Figure 14 This is a longitudinal vertical sectional view of the platform structure of the three-dimensional air supply air conditioning unit in Example 4;

[0054] Figure 15 This is a top view of the airflow operation of the three-dimensional air supply air conditioning unit platform in Example 4;

[0055] Figure 16 This is a schematic diagram showing the relationship between the air intake and exhaust areas on the exterior of the equipment platform. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] This invention, based on thermodynamics and fluid mechanics, innovates the performance optimization path of air conditioning unit, the air inlet and outlet structure of building equipment platform, and the energy coupling characteristics and improvements between air conditioning unit and equipment platform.

[0061] Under the concept of building distributed energy systems, the core objective of optimizing the air conditioning unit in this invention is to "reduce condensing pressure and increase evaporating pressure": reducing refrigeration condensing pressure directly reduces the compressor's compression work; while increasing the air conditioning heat pump's evaporating pressure increases the density of the low-pressure refrigerant gas drawn into the compressor, which in turn increases the refrigerant circulation, evaporator heat absorption, condenser heat release, and reduces the compression ratio and compressor exhaust temperature. If the evaporating pressure of the external heat exchanger (evaporator) of the heat pump air conditioning unit is increased from 5 kg to 6 kg in winter, the refrigerant circulation, evaporator heat absorption, and condenser heat release of the air conditioning heat pump system will inevitably increase by about 20% simultaneously, and the compressor compression ratio and compressor exhaust temperature will also drop accordingly. The physical judgment that "evaporating pressure (evaporating temperature) is the primary factor of the refrigeration system" is the technical starting point and support for the continuous optimization of the refrigeration and air conditioning system.

[0062] This invention, in specific scenarios involving low-temperature and high-temperature heat sources, achieves the goal of "reducing condensing pressure, especially increasing evaporating pressure" in the air conditioning unit. Based on the relationship between the heat transfer capacity Q of the finned tube heat exchangers (evaporator, condenser, etc.) and the overall heat transfer coefficient K, heat transfer area S, and the temperature difference ΔT between the refrigerant and air (Q = K × S × ΔT), this invention derives the technical path judgment that "the key to improving the evaporating pressure, reducing the condensing pressure, and improving the heat transfer capacity of the external heat exchanger of the air conditioning unit lies in increasing the total heat transfer area S."

[0063] like Figure 1As shown, the difference between condensing temperature and evaporating temperature (T2-t2) is the fundamental factor determining the core indicator COP of the refrigeration and air conditioning system. A higher (T2-t2) will result in a lower COP, and vice versa. The COP of the refrigeration and air conditioning system is inversely related to the difference between condensing temperature and evaporating temperature (T2-t2). The difference between condensing temperature and evaporating temperature (T2-t2) is the sum of three temperature differences: the condenser heat transfer temperature difference (T2-T1), the high-temperature heat source and low-temperature heat source temperature difference (T1-t1), and the evaporator heat transfer temperature difference (t1-t2). Therefore, given that the temperature difference between the high-temperature heat source and the low-temperature heat source (T1-t1) is an objective reality that cannot be changed, reducing the condenser heat transfer temperature difference (T2-T1) and the evaporator heat transfer temperature difference (t1-t2) is the only way to reduce the difference between the condensing temperature and the evaporating temperature (T2-t2) of the air conditioning heat pump system. This is the only way to reduce the system condensing pressure (condensing temperature), increase the system evaporating temperature (evaporating pressure), increase the system refrigerant circulation, increase the heat absorption of the evaporator and the heat release of the condenser, and increase the COP of the refrigeration and air conditioning system.

[0064] In current refrigeration and air conditioning systems, the widespread use of corrugated fins, slotted fins, and internally threaded copper tubes in finned tube heat exchangers such as evaporators and condensers has brought the overall heat transfer coefficient K of the external heat exchanger of the air conditioning unit close to its peak value, significantly reducing the marginal effect of further optimizing the K value. Furthermore, 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 are specifically determined—increasing the ΔT between the low-temperature medium between the evaporator fins (e.g., low-temperature indoor air in summer) and the refrigerant in the copper tubes inevitably lowers the evaporation temperature and pressure. Conversely, increasing the ΔT between the high-temperature, high-pressure refrigerant gas in the condenser copper tubes and the high-temperature medium between the fins (e.g., high-temperature ambient air in summer) inevitably raises the condensation pressure and temperature. Therefore, increasing the heat transfer temperature difference ΔT between the evaporator and condenser impairs the refrigerant circulation, heat absorption capacity, heat release capacity, and COP of the entire refrigeration system.

[0065] Based on the above thermodynamic analysis, this invention focuses on increasing the total heat transfer area S of the finned tube heat exchanger among the three factors K, S, and ΔT that constitute the heat transfer capacity Q of the external heat exchanger of the air conditioning unit.

[0066] like Figure 2 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.

[0067] 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):

[0068] (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;

[0069] (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.

[0070] (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.

[0071] Example 1

[0072] like Figure 3-9 As shown, a three-dimensional air supply air conditioning unit includes a finned tube heat exchanger assembly, a housing, an air conditioning compressor 121, a gas-liquid separator 126, and a fan 38.

[0073] The finned tube heat exchanger assembly includes three finned tube heat exchangers 37, which include a horizontal C-type finned tube heat exchanger and a vertical V-type finned tube heat exchanger.

[0074] All refrigerant lines of the finned tube heat exchangers 37 in the finned tube heat exchanger assembly are connected to the same air conditioning compressor.

[0075] The finned tube heat exchanger 37 is equipped with a refrigerant path 134 and a lotus-shaped gas collection pipe 133.

[0076] Three finned tube heat exchangers 37 are arranged along the long side inside the shell; among them, the front finned tube heat exchanger 371 near the air inlet is two vertical V-shaped finned tube heat exchangers, and the two vertical V-shaped finned tube heat exchangers are connected to form a negative pressure chamber.

[0077] The rear-mounted finned tube heat exchanger 372 is a horizontal C-type finned tube heat exchanger.

[0078] A water collection tray 153 is provided below the finned tube heat exchanger 37.

[0079] The bottom of the housing is provided with a heightening bracket 136 for installing the finned tube heat exchanger 37;

[0080] The space expanded by the heightening bracket 136 at the lower part of the front finned tube heat exchanger 371 inside the shell and the middle and lower parts of the horizontal sides of the vertical V-shaped finned tube heat exchanger constitute the air intake channel 135 of the air conditioning unit.

[0081] The air conditioning compressor 121 and the gas-liquid separator 126 are located at the bottom of the negative pressure chamber 124 of the rear finned tube heat exchanger 372. More specifically, they are located in the lower middle part of the back plate of the negative pressure chamber of the rear finned tube heat exchanger 372.

[0082] A fan 38 is installed at the top of the negative pressure chamber 124 of the finned tube heat exchanger 37; an exhaust chamber 33 connected to the housing is provided above the fan 38; the exhaust port 331 of the exhaust chamber 33 faces the short side of the air conditioning unit housing.

[0083] Fan 38 is an axial flow fan.

[0084] In this embodiment, the air conditioning unit and the indoor heat exchanger 127 are connected to form an air conditioning system.

[0085] In this embodiment, the air conditioning unit is replaced 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 corridor with one side open.

[0086] In this embodiment, the air conditioning unit, in the aforementioned semi-enclosed building corridor scenario, innovates its design by increasing the total ventilation cross-sectional area and total fin area of ​​the air conditioning unit's finned tube heat exchanger assembly, and reducing the heat transfer temperature difference of the external heat exchanger.

[0087] ① Innovative host structure design

[0088] This invention uses horizontal C-type finned tube heat exchangers and vertical V-type finned tube heat exchangers as basic heat exchanger units to construct the air conditioning unit's finned tube heat exchanger assembly. Within the limited space of the air conditioning unit, multiple horizontal C-type finned tube heat exchangers and vertical V-type finned tube heat exchangers are arranged. A large area of ​​heat exchanger ventilation surface is spread out along the air inlet surface of the finned tubes of multiple horizontal C-type finned tube heat exchangers and vertical V-type finned tube heat exchangers. A huge area of ​​finned heat transfer surface is then spread out again on the large area of ​​heat exchanger ventilation 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, increasing the evaporation pressure and reducing the condensation pressure, and improving Q and COP, thus constructing a heavy-duty air conditioning unit.

[0089] This invention provides multiple external heat exchanger negative pressure chambers along the long side of the air conditioning unit (i.e., the longitudinal direction of the equipment platform, or the orthogonal direction of the exterior facade). These chambers include negative pressure chambers with horizontal C-shaped finned tube heat exchangers and vertical V-shaped finned tube heat exchangers. The horizontal C-shaped finned tube heat exchanger negative pressure chambers are located far from the air inlet and outlet of the air conditioning unit, while the vertical V-shaped finned tube heat exchanger negative pressure chambers are located close to and raised above the air inlet and outlet of the air conditioning unit. This incorporates the main sections of the air inlet and outlet channels of the finned tube heat exchanger assembly into the interior of the air conditioning unit.

[0090] The present invention provides at least one horizontal C-shaped finned tube heat exchanger negative pressure chamber and one vertical V-shaped finned tube heat exchanger negative pressure chamber. The horizontal C-shaped finned tube heat exchanger negative pressure chamber is installed on the ground near the short side, and the air conditioning unit compressor, four-way valve, expansion valve, electrical box and other refrigerant circuit components are installed in the horizontal C-shaped finned tube heat exchanger negative pressure chamber.

[0091] ② Innovative design of the air conditioning unit's external heat exchanger inlet and outlet airflow.

[0092] This invention is designed around multiple external heat exchanger negative pressure chambers. The horizontal C-type finned tube heat exchanger and the vertical V-type finned tube heat exchanger negative pressure chamber of the air conditioning unit are each composed of a base plate, side plates, external finned tube heat exchangers, and a top plate. The top plate has exhaust vents for the external heat exchanger negative pressure chambers, and a fan is installed at the exhaust vent. The horizontal C-type finned tube heat exchanger and the vertical V-type finned tube heat exchanger are their respective negative pressure chamber inlets. An exhaust chamber is located above the top plate of the negative pressure chamber, and the exhaust vent of the exhaust chamber is located on the same side as the main air inlet of the air conditioning unit. The multiple exhaust chamber inlets are connected to the exhaust vents of the fans in the negative pressure chambers of the horizontal C-type finned tube heat exchanger and the vertical V-type finned tube heat exchanger.

[0093] This invention elevates the negative pressure chamber of the vertical V-shaped finned tube heat exchanger, utilizing the top opening and bottom closing structure of the vertical V-shaped finned tube heat exchanger to compress the bottom space of the negative pressure chamber, thereby obtaining the external space released from the lower side of the vertical V-shaped finned tube heat exchanger and the space below the vertical V-shaped finned tube heat exchanger to construct a large-section horizontal air inlet channel for the external heat exchanger; the unused space at the top of the equipment platform is used to set up the exhaust chamber of the air conditioning unit, with the exhaust port of the exhaust chamber and the air inlet of the air inlet channel set on the same side and above each other, and the area of ​​the exhaust port is significantly smaller than the area of ​​the air inlet;

[0094] In this embodiment, multiple fans are used to establish the airflow field for the external heat exchanger of the air conditioning unit: multiple fans draw air from the negative pressure chambers of their respective connected horizontal C-shaped finned tube heat exchangers and vertical V-shaped finned tube heat exchangers, creating negative pressure within the chambers. This draws ambient air into the air conditioning unit at medium speed through the air inlet. The air then passes through the large-section horizontal air intake channel below and to the side of the vertical V-shaped finned tube heat exchanger, where it is dispersed and slowed down. Afterward, the air flows at low speed and low resistance through the gaps between the fins of the horizontal C-shaped finned tube heat exchanger and the vertical V-shaped finned tube heat exchanger to complete heat exchange before entering the negative pressure chamber. The air then converges and accelerates, flowing into the fan intake with the lowest pressure. Finally, the air is pressurized by the fan and discharged at high speed through the exhaust chamber.

[0095] ③ Innovative design of refrigeration circuit

[0096] In this embodiment, the air conditioning unit innovatively places the compressor, four-way valve, expansion valve, gas-liquid separator, and other refrigeration circuit components in the lower middle part of the negative pressure chamber of the horizontal C-type finned tube heat exchanger, close to the back plate of the negative pressure chamber. This area is precisely the ventilation blind zone of the negative pressure chamber of the horizontal C-type finned tube heat exchanger. These components, together with the external heat exchanger, refrigerant connection pipe, indoor unit heat exchanger, and other components, form a refrigeration and air conditioning cycle in the order of compressor-four-way valve-condenser-expansion valve-evaporator-four-way valve-gas-liquid separator-compressor. The compressor serves as the power source for the refrigeration cycle, driving the air conditioning system through the condenser and evaporator. High and low pressure states of refrigerant are established in the pipeline, driving the refrigerant to circulate and undergo repeated phase changes in the refrigeration cycle to achieve "heat transfer". That is, the refrigerant liquid evaporates and absorbs heat in the evaporator pipeline, and then absorbs the heat of the low-temperature ambient air flowing between the fins through the huge heat absorption area S of the copper tube. The high-temperature and high-pressure refrigerant gas condenses and releases heat in the condenser pipeline, and then releases heat to the high-temperature ambient air flowing between the fins through the huge heat release area S of the copper tube. This realizes 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.

[0097] In this embodiment, when the air conditioning unit is running, multiple fans in the negative pressure chambers of multiple external heat exchangers arranged along the long side of the air conditioning unit operate, drawing air from the negative pressure chambers of the horizontal C-shaped finned tube heat exchangers and vertical V-shaped finned tube heat exchangers that are connected to each other, generating negative pressure in the chambers, which pulls the air outside the external heat exchangers into the air conditioning unit at a medium speed of about 4m / s. After the air outside enters the air conditioning unit, it is dispersed and decelerated through the large-section horizontal air intake channel in the external space below the vertical V-shaped finned tube heat exchanger and the space below the vertical V-shaped finned tube heat exchanger. Then, it flows through the gap between the fins of the horizontal C-shaped finned tube heat exchanger and the vertical V-shaped finned tube heat exchanger at a low speed and low resistance of about 1.6m / s to complete the heat exchange before entering the negative pressure chamber. Then, it gathers and accelerates to flow into the fan intake port with the lowest pressure, and finally, it is pressurized by the fan and discharged outward at a high speed of about 8m / s through the exhaust chamber.

[0098] Example 2

[0099] like Figure 10-12 As shown, this embodiment is similar in structure to embodiment 1, except that the front finned tube heat exchanger 371 near the air inlet is two vertical V-shaped finned tube heat exchangers, and each vertical V-shaped finned tube heat exchanger constitutes an independent negative pressure chamber.

[0100] Both this embodiment and Embodiment 1 incorporate the main sections of the air inlet and exhaust channels of the finned tube heat exchanger assembly into the air conditioning unit. Both use horizontal C-type and vertical V-type finned tube heat exchangers as basic heat exchanger units to construct the air conditioning unit's finned tube heat exchanger assembly. Within the limited space of the air conditioning unit, multiple horizontal C-type and vertical V-type finned tube heat exchangers are installed. A large area of ​​heat exchanger ventilation surface is extended from the air inlet surface of the finned tubes of these heat exchangers. A large area of ​​finned heat transfer surface is then further extended from this large ventilation surface. This effectively increases the total finned heat transfer area S of the air conditioning unit's finned tube heat exchanger assembly, reduces the heat transfer temperature difference ΔT, increases evaporation pressure, and reduces condensation pressure, thus constructing a heavy-duty air conditioning unit.

[0101] Because the air conditioning unit has a large total cooling (heating) power and a large air volume, when the air conditioning unit module is running, the air velocity at the air inlet and the area near the air inlet is relatively large, and the longitudinal friction resistance and local resistance of the air inlet channel are relatively large. The longitudinal gradient of the air pressure field in the air inlet channel outside the negative pressure chamber of the vertical V-shaped finned tube heat exchanger is relatively large, which causes the pressure difference between the inside and outside of the vertical V-shaped finned tube heat exchanger to be uneven. The pressure difference between the inside and outside of the finned tube heat exchanger is the largest near the air inlet, and the ventilation volume per unit area on the ventilation surface of the heat exchanger is the largest. Along the longitudinal direction inward, the pressure difference between the inside and outside of the finned tube heat exchanger decreases, and the ventilation volume per unit area also decreases accordingly.

[0102] In this embodiment, the negative pressure chamber of the vertical V-shaped finned tube heat exchanger is divided into two sub-negative pressure chambers along its long side. Each sub-negative pressure chamber has its own fan and operates independently, thus improving the uniformity of ventilation on the ventilation surfaces of the finned tube heat exchangers in each sub-negative pressure chamber. The power consumption of the fan motor in the deeper sub-negative pressure chamber is slightly higher than that of the fan motor in the sub-negative pressure chamber at the air inlet.

[0103] This embodiment has all the advantages of Embodiment 1. Furthermore, since the negative pressure chamber of the vertical V-shaped finned tube heat exchanger is divided into two sub-negative pressure chambers along its long side, each sub-negative pressure chamber has its own fan and independent ventilation, the uneven pressure difference and uneven ventilation caused by the large longitudinal gradient of the air pressure field in the air inlet channel outside the negative pressure chamber of the vertical V-shaped finned tube heat exchanger are eliminated. The ventilation uniformity on the ventilation surface of the finned tube heat exchanger in each sub-negative pressure chamber is improved.

[0104] Example 3

[0105] like Figure 13 As shown, this embodiment is similar in structure to Embodiment 1, except that the front-mounted finned tube heat exchanger 371 near the air inlet consists of two vertical V-shaped finned tube heat exchangers, each forming an independent negative pressure chamber. The two vertical V-shaped finned tube heat exchangers have different vertical heights.

[0106] The vertical height of the vertical V-shaped finned tube heat exchanger near the air inlet is less than the vertical height of the other vertical V-shaped finned tube heat exchanger.

[0107] Both this embodiment and Embodiment 1 incorporate the main sections of the air inlet and exhaust channels of the finned tube heat exchanger assembly into the air conditioning unit. Both use horizontal C-type and vertical V-type finned tube heat exchangers as basic heat exchanger units to construct the air conditioning unit's finned tube heat exchanger assembly. Within the limited space of the air conditioning unit, multiple horizontal C-type and vertical V-type finned tube heat exchangers are installed. A large area of ​​heat exchanger ventilation surface is extended from the air inlet surface of the finned tubes of these heat exchangers. A large area of ​​finned heat transfer surface is then further extended from this large ventilation surface. This effectively increases the total finned heat transfer area S of the air conditioning unit's finned tube heat exchanger assembly, reduces the heat transfer temperature difference ΔT, increases evaporation pressure, and reduces condensation pressure, thus constructing a heavy-duty air conditioning unit.

[0108] Because the air conditioning unit has a large total cooling (heating) power and a large air volume, the air velocity at and near the air inlet is relatively high during operation. The longitudinal friction resistance and local resistance of the air inlet channel are also relatively high. The longitudinal pressure gradient of the air pressure field in the air inlet channel outside the negative pressure chamber of the vertical V-shaped finned tube heat exchanger is relatively large, resulting in an uneven pressure difference between the inside and outside of the vertical V-shaped finned tube heat exchanger. The pressure difference is greatest near the air inlet, and the ventilation volume per unit area on the heat exchanger ventilation surface is the greatest. As the longitudinal direction moves inward, the pressure difference between the inside and outside of the finned tube heat exchanger decreases, and the ventilation volume per unit area also decreases accordingly.

[0109] In this embodiment, the negative pressure chamber of the vertical V-shaped finned tube heat exchanger is divided into two sub-negative pressure chambers along its long side. Each sub-negative pressure chamber has its own fan and independent ventilation. The bottom water receiving tray of the vertical V-shaped finned tube heat exchanger adjacent to the air inlet and outlet of the main unit is raised, the V-shaped cross-section is reduced, and the cross-sectional area of ​​the air inlet channels on both sides is increased. The air inlet channel of the main unit is reduced in stages from the outside to the inside, which matches the air volume undertaken in each stage.

[0110] This embodiment has all the advantages of Embodiment 1 / 2. Furthermore, due to the elevation of the bottom water receiving tray of the vertical V-shaped finned tube heat exchanger adjacent to the air inlet and outlet of the main unit, the V-shaped cross-section is reduced, and the cross-section of the air inlet channel on both sides of the V-shape is enlarged, forming a stepped configuration structure in which the air inlet channel of the main unit shrinks in stages from the outside to the inside. The air supply cross-sectional area of ​​each stage of the air duct in the longitudinal direction is highly matched with the air supply volume undertaken by this stage.

[0111] Example 4

[0112] like Figure 14-16 As shown, an air conditioning unit equipment platform is provided, in which multiple air conditioning units of Embodiment 1, Embodiment 2, Embodiment 3 or Embodiment 4 are arranged horizontally within the equipment platform; only one row of air conditioning units is arranged horizontally within the equipment platform.

[0113] The equipment platform 151 has an exterior facade 1 for ventilation, and the air intake and distribution channel of the air conditioning unit is close to the exterior facade 1; the air inlet 125 is close to the exterior facade 1.

[0114] An exhaust chamber 33 is provided above the air conditioning unit, and the exhaust port 331 of the exhaust chamber 33 is close to the exterior facade 1.

[0115] The exhaust area 132 on the exterior facade 1 corresponds to the air conditioner unit exhaust port 331, and the air inlet area 34 on the exterior facade 1 corresponds to the air conditioner unit air inlet port 125.

[0116] The exhaust zones 132 on facade 1 are continuously arranged on the upper part of the facade, and the air intake zones 34 on facade 1 are continuously arranged on the middle and lower parts of the facade. The boundary between the exhaust zones 132 and the air intake zones 34 on facade 1 is a horizontal straight line or the boundary line is close to a horizontal straight line.

[0117] The area of ​​the exhaust zone on facade 1 is 25% to 50% of the facade area used for ventilation. Facades used for ventilation refer to facades where airflow enters and exits.

[0118] The back panel 39 of the air conditioning unit and the inner wall 2 of the equipment platform form a three-in-one passage 51 for pedestrians, maintenance, and installation of air conditioning system copper pipes and cable trays.

[0119] This embodiment utilizes the unused space at the top of the equipment platform to set up an exhaust chamber. The exhaust port of the exhaust chamber is set on the same side and above the air inlet of the air inlet channel. The area of ​​the exhaust port is significantly smaller than the area of ​​the air inlet.

[0120] An entrance door 152 is provided on the equipment platform 151.

[0121] In this embodiment, the equipment platform has the vertical exterior facade as its longitudinal direction and the horizontal exterior facade as its transverse direction.

[0122] In this embodiment, air conditioning units are installed horizontally at intervals on the equipment platform. The air inlet and outlet of the air conditioning units face the outer facade 1, that is, the long side of the unit is set as vertical and the short side is set as horizontal.

[0123] This embodiment addresses the issues of low energy density of the air conditioning unit and equipment platform, and excessive horizontal width of the equipment platform occupying the building facade. While ensuring convenient installation and maintenance of the air conditioning unit, it innovatively restructures the external heat exchanger airflow system.

[0124] ① High power density air conditioning unit adopted

[0125] This embodiment employs a high-power-density air conditioning unit. The main sections of the air inlet and exhaust channels of the finned tube heat exchanger assembly are incorporated into the air conditioning unit. In this embodiment, the air conditioning unit uses horizontal C-type finned tube heat exchangers and vertical V-type finned tube heat exchangers as basic heat exchanger units to construct the finned tube heat exchanger assembly. Within the limited space of the air conditioning unit, multiple horizontal C-type finned tube heat exchangers and vertical V-type finned tube heat exchangers are arranged. A large area of ​​heat exchanger ventilation surface is spread out along the air inlet surface of the finned tube heat exchanger assembly. A huge area of ​​finned heat transfer surface is then spread out again on the large area of ​​heat exchanger ventilation surface, thereby effectively increasing the total heat transfer area S of the finned tube heat exchanger assembly of the air conditioning unit, reducing the heat transfer temperature difference ΔT, increasing the evaporation pressure and reducing the condensation pressure, thus constructing a heavy-duty air conditioning unit.

[0126] In this embodiment, the main module compressor, electrical box and other refrigerant circuit components are set in the negative pressure chamber of the horizontal C-type finned tube heat exchanger, and the back plate of the negative pressure chamber faces the maintenance channel for easy maintenance.

[0127] ②Reorganize the airflow path of the air conditioning unit's external heat exchanger

[0128] In the lower part of the equipment platform, air conditioning units are installed horizontally adjacent to each other. The vertical V-shaped finned tube external heat exchangers of the two horizontally adjacent heavy-duty air conditioning units form a hexagonal air intake channel with a narrow top and a wide bottom. Furthermore, the air conditioning units directly introduce fresh air from the exterior facade of the equipment platform, eliminating the traditional air intake and supply channels of the air conditioning units. The exhaust adopts an upward air outlet mode, with the exhaust air from the external heat exchanger directly discharged into the ambient atmosphere outside the exterior facade.

[0129] ③Developed idle and inefficient space on the equipment platform

[0130] Heavy-duty air conditioning unit exhaust chambers are spaced out in the top space of the equipment platform;

[0131] The air conditioning unit is spaced approximately 100mm horizontally to allow for vertical pulling out and feeding of the unit.

[0132] A pedestrian maintenance passage is provided between the inner wall of the equipment platform and the horizontally arranged air conditioning units; above the maintenance passage, a cable tray is provided to house the copper pipes connecting the indoor and outdoor units of the air conditioning system, as well as the power cables and signal lines of the air conditioning units.

[0133] During operation of this embodiment, the fan in the negative pressure chamber of the external heat exchanger, which is set along the longitudinal direction (i.e., the long side of the main unit) of the air conditioning unit on the equipment platform, operates to draw air out of the negative pressure chambers of the horizontal C-shaped finned tube heat exchanger and the vertical V-shaped finned tube heat exchanger, which are connected to each other. This creates negative pressure in the chamber, pulling the ambient air through the outer facade of the equipment platform and into the interior of the air conditioning unit. After entering the interior of the air conditioning unit, the ambient air disperses and slows down, flowing towards the horizontal C-shaped finned tube heat exchanger and the vertical V-shaped finned tube heat exchanger. It flows at low speed through the fin gaps of the horizontal C-shaped finned tube heat exchanger and the vertical V-shaped finned tube heat exchanger, realizing the heat exchange between the ambient air and the refrigerant in the copper tubes of the external heat exchanger. After heat exchange, the ambient air enters the negative pressure chamber, and is further gathered and accelerated, flowing into the fan intake with the lowest pressure. It is then pressurized and accelerated by the fan, passing through the exhaust chamber, and injected at high speed into the ambient atmosphere through the top of the outer facade of the equipment platform for diffusion and dilution.

[0134] The advantages of the device platform in this embodiment include:

[0135] ① Construct an air conditioning unit with a side-inlet and side-outlet airflow system on the exterior facade of the equipment platform.

[0136] This embodiment addresses the practical application scenario where the net height of the central air conditioning unit platform exceeds 4m. It innovates an aerodynamic layout of "medium-speed air intake on the platform facade and the lower part of the air conditioning unit, high-speed air exhaust at the top, with the air intake and exhaust ports set in the same direction and on the same side, and the air intake area: exhaust area ≈ 2:1". An "exhaust cavity" with an exhaust cross-sectional area of ​​approximately 1 / 2 of the air intake surface is set at the top of the negative pressure chamber of the external heat exchanger of the air conditioning unit, developing the air duct function of the top space of the equipment platform. The air exhaust port and air intake port of the air conditioning unit are set in the same direction, on the same side, and vertically on the exterior facade of the equipment platform, constructing a side-in, side-out air duct structure system for the air conditioning unit equipment platform.

[0137] In this embodiment, under the design concept of air intake area: exhaust area ≈ 2:1 on the outer facade of the equipment platform, the exhaust speed reaches twice the intake speed, and the exhaust dynamic pressure head reaches four times the intake dynamic pressure head. This effectively improves the exhaust speed and kinetic energy of the external heat exchanger of the air conditioning unit, and effectively improves the range and diffusion dilution effect of the exhaust air penetrating the outer facade of the equipment platform and entering the ambient atmosphere.

[0138] ②Increase the power density of the equipment platform and reduce the footprint of the equipment platform

[0139] This embodiment uses horizontal C-type finned tube heat exchangers and vertical V-type finned tube heat exchangers as basic heat exchanger units to construct the air conditioning unit's finned tube heat exchanger assembly. Within the limited space of the air conditioning unit, multiple horizontal C-type finned tube heat exchangers and vertical V-type finned tube heat exchangers are set up. A large area of ​​heat exchanger ventilation surface is spread out along the air inlet surface of the finned tubes of multiple horizontal C-type finned tube heat exchangers and vertical V-type finned tube heat exchangers. A huge area of ​​finned heat transfer surface is then spread out again on the large area of ​​heat exchanger ventilation 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, increasing the evaporation pressure and reducing the condensation pressure, thus constructing a heavy-duty air conditioning unit.

[0140] The airflow structure of the air conditioning unit used in this embodiment, in the chain process of medium-speed air intake of the external heat exchanger → dispersion and deceleration → massive heat exchange of the fins on the total huge ventilation surface → convergence and acceleration → fan pressurization → high-speed discharge, with the fan as the power source and the massive heat exchanger fins as the area of ​​lowest airflow velocity, completes one fan pressurization and two static-dynamic pressure conversions before and after the fan. It is efficient and smooth, and constructs a high-efficiency heat exchange airflow structure inside the air conditioning unit, demonstrating the heavy-duty characteristics of the air conditioning unit.

[0141] This embodiment, based on the air conditioning unit with heavy-duty characteristics, innovates the equipment platform layout by developing the air intake channel function below the vertical V-shaped finned tube external heat exchanger of the air conditioning unit, and the exhaust duct function of the idle space on the top of the equipment platform. It also reduces the lateral spacing between air conditioning units and combines the pedestrian passage, maintenance passage, and copper pipe cable tray passage into a "three-in-one" system. This significantly reduces the floor space occupied by ineffective and inefficient spaces and ventilation blind spots, and increases the average cooling and heating power density (i.e., cooling and heating capacity per unit area) of the air conditioning unit equipment platform from the current 11.6 kW / ㎡ to over 25 kW / ㎡, an increase of 100%. Under the same cooling and heating load, it saves 1 / 2 of the equipment platform area.

[0142] ③Reduce the horizontal width of the equipment floor facade occupied by the air inlet and outlet surfaces of the air conditioning unit.

[0143] The width of a building facade is a crucial resource in the building index system, second only to the building area. Currently, the air conditioning unit's air inlet and outlet surfaces occupy too much of the horizontal width of the building's equipment floor facade, which obstructs ventilation, lighting, and visual communication between the interior space and the external environment on the same floor. This has become a prominent problem in building HVAC design.

[0144] This embodiment improves the power density of the air conditioning unit by reorganizing the internal external heat exchanger and the air inlet and outlet paths of the external heat exchanger. Furthermore, it reorganizes the structural relationship between the air conditioning unit and the equipment platform, significantly reducing inefficient and ineffective space. As a result, under the same building heat load conditions, it significantly reduces the floor area occupied by the equipment platform and the lateral width of the building equipment floor facade occupied by the air inlet and outlet surfaces of the air conditioning unit, thus ensuring ventilation, lighting, and visual communication between the interior space of the same floor and the external environment.

[0145] ④ Facilitate air conditioner unit inspection and repair

[0146] The air conditioning unit used in this embodiment has multiple external heat exchanger negative pressure chambers arranged longitudinally. The compressor, gas-liquid separator, four-way valve, expansion valve, electrical box and other refrigerant circuit components are centrally arranged in the rear C-type finned tube heat exchanger negative pressure chamber. There are no refrigerant circuit components inside and outside the front vertical V-type finned tube heat exchanger negative pressure chamber except for the fan.

[0147] In this embodiment, the back panel of the negative pressure chamber of the horizontal C-shaped finned tube heat exchanger of the air conditioning unit faces the maintenance channel inside the equipment platform, which facilitates the inspection and maintenance of the air conditioning unit. When a fault occurs, the back panel of the negative pressure chamber of the C-shaped finned tube heat exchanger of the air conditioning unit can be opened through the maintenance channel inside the equipment platform. The refrigerant circuit components such as the compressor, gas-liquid separator, four-way valve, expansion valve, and electrical box that may be faulty are clearly visible, making inspection and maintenance very convenient. This embodiment solves the inherent historical problem of inspection and maintenance of air conditioning units.

[0148] 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. A three-dimensional air supply air conditioning unit, characterized in that, Includes finned tube heat exchanger assembly, shell, air conditioning compressor, gas-liquid separator and fan; The finned tube heat exchanger assembly includes at least two finned tube heat exchangers, which include a horizontal C-type finned tube heat exchanger and a vertical V-type finned tube heat exchanger. All refrigerant lines of the finned tube heat exchanger assembly are connected to the same air conditioning compressor. At least two finned tube heat exchangers are spaced apart along the long side inside the shell. The gap between the front finned tube heat exchanger and the rear finned tube heat exchanger along the long side serves as an air inlet channel. Both the front finned tube heat exchanger and the rear finned tube heat exchanger independently form a negative pressure chamber. Among them, the front finned tube heat exchanger near the air inlet is a vertical V-shaped finned tube heat exchanger; the rear finned tube heat exchanger is a horizontal C-shaped finned tube heat exchanger. The air conditioning compressor and the gas-liquid separator are located at the bottom of the negative pressure chamber of the rear finned tube heat exchanger or in the lower space outside the negative pressure chamber. A fan is installed at the top of the negative pressure chamber of the finned tube heat exchanger; an exhaust chamber connected to the shell is provided above the fan; the exhaust port of the exhaust chamber faces the short side of the air conditioner unit shell; The air conditioning unit is installed on a semi-enclosed equipment platform; At least one air conditioning unit is arranged horizontally within the equipment platform; the equipment platform has an exterior facade for ventilation, and the air inlet and distribution channel of the air conditioning unit is close to the exterior facade; the exhaust port of the exhaust chamber is located and / or close to the exterior facade; The bottom of the housing is provided with a heightening bracket for installing the finned tube heat exchanger; the rear finned tube heat exchanger is located at the bottom of the housing; the front finned tube heat exchanger is located on the heightening bracket. The space expanded by the heightening bracket at the lower part of the front-mounted finned tube heat exchanger inside the housing and the middle and lower parts of the horizontal sides of the vertical V-shaped finned tube heat exchanger constitute the air intake and distribution channel of the air conditioning unit.

2. The air conditioning unit with three-dimensional air supply according to claim 1, characterized in that, The front-mounted finned tube heat exchanger consists of two vertical V-shaped finned tube heat exchangers; the two vertical V-shaped finned tube heat exchangers are connected to form a negative pressure chamber.

3. The air conditioning unit with three-dimensional air supply according to claim 1, characterized in that, The front-mounted finned tube heat exchanger consists of two vertical V-shaped finned tube heat exchangers; each of the vertical V-shaped finned tube heat exchangers constitutes an independent negative pressure chamber.

4. The air conditioning unit with three-dimensional air supply according to claim 1, characterized in that, The fan is either an axial flow fan or a centrifugal fan.

5. An air conditioning unit equipment platform, characterized in that, At least one air conditioning unit as described in any one of claims 1 to 4 is arranged horizontally within the equipment platform; the equipment platform has an exterior facade for ventilation, and the air inlet and distribution channel of the air conditioning unit is close to the exterior facade; an exhaust chamber is provided above the air conditioning unit, and the exhaust port of the exhaust chamber is located and / or close to the exterior facade.

6. The air conditioning unit platform according to claim 5, characterized in that, The exhaust area on the exterior facade corresponds to the exhaust port of the air conditioning unit, and the air inlet area on the exterior facade corresponds to the air inlet of the air conditioning unit.

7. The air conditioning unit platform according to claim 5, characterized in that, The exhaust zones on the facade are continuously arranged on the upper part of the facade, and the air intake zones on the facade are continuously arranged on the middle and lower parts of the facade.

8. The air conditioning unit platform according to claim 7, characterized in that, The area of ​​the exhaust zone on the facade is 25% to 50% of the facade area used for ventilation.

9. The air conditioning unit platform according to claim 5, characterized in that, The back panel of the air conditioning unit and the inner wall of the equipment platform form a three-in-one passage for pedestrians, maintenance, and installation of copper pipes and cable trays for the air conditioning system.

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