An open-air equipment platform with a broken-line finned tube heat exchanger air conditioner main unit

Abstract

This invention belongs to the field of green building and energy-saving air conditioning technology, and discloses an external corridor-type equipment platform using a zigzag-shaped finned tube heat exchanger air conditioning unit. The air conditioning unit is horizontally arranged inside the equipment platform, with the exhaust port of the exhaust chamber and the air inlet of the air conditioning unit on the same side. 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. A three-in-one passage is formed between the back panel of the air conditioning unit and the inner wall of the equipment platform for pedestrian access, maintenance, and the installation of copper pipes and cable trays for the air conditioning system. This invention constructs a short-path, low-resistance external heat exchanger air conditioning unit airflow system that integrates internal and external connections; increases the power density of the equipment platform while reducing its footprint; reduces the horizontal width of the equipment platform's exterior facade occupied by the air inlet and outlet surfaces of the air conditioning unit; and facilitates the inspection and maintenance of the air conditioning unit.

Description

Technical Field

[0001] This invention belongs to the field of green building and energy-saving air conditioning technology, and more specifically, relates to an external corridor-type equipment platform that uses a zigzag finned tube heat exchanger air conditioning unit. Background Technology

[0002] An external corridor-type equipment platform refers to a floor of a high-rise building where the entire or most of the effective area of ​​its outer edge is used for the installation of equipment such as air conditioners. Currently, the external heat exchanger modules of commercial central air conditioning units are mostly configured with a "finned tube heat exchanger + top-discharge axial flow fan".

[0003] Multi-split commercial central air conditioning units used in high-rise or super high-rise buildings are typically arranged in an external corridor-style equipment platform to efficiently and intensively utilize the platform space and air energy resources, thereby reducing the construction cost of the platform while achieving efficient use of energy resources.

[0004] Existing technology (CN215889470U) discloses an equipment room for housing outdoor units, which adds louvers and air guides inside the equipment room. The louvers are installed on the windows, the air inlet of the air guide is connected to the outdoor unit, and the air outlet of the air guide is close to or abuts against the louvers. This solution, by using the combination of louvers and air guides, can directly exhaust the hot air generated by the outdoor unit in summer to the outside of the equipment room, which improves the heat exchange performance of the outdoor unit's heat exchanger to a certain extent. However, it still cannot effectively solve the problems of uneven ventilation and heat exchange inside the equipment platform, and excessively high temperatures in summer and excessively low temperatures in winter.

[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 / ㎡. However, 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 floor 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. Summary of the Invention

[0008] To address the aforementioned technical problems and achieve uniform ventilation and heat exchange of the air conditioning unit's external heat exchanger under its own atmospheric pressure; to enable ultra-high efficiency development and utilization of the equipment platform across all spaces and zones, achieving no blind spots or dead angles; and to significantly improve the energy density of the equipment platform, this invention provides an external corridor-type equipment platform for an air conditioning unit using a zigzag-shaped finned tube heat exchanger.

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

[0010] An outer corridor-type equipment platform using a zigzag-shaped finned tube heat exchanger air conditioning unit, wherein at least one row of air conditioning units is arranged laterally inside the equipment platform;

[0011] The equipment platform has an exterior facade for ventilation, and the air inlet of the air conditioning unit is close to the exterior facade; the exhaust outlet of the exhaust chamber is located and / or close to the exterior facade; the exhaust outlet of the exhaust chamber is located on the same side as the air inlet of the air conditioning unit.

[0012] The exhaust area on the exterior facade corresponds to the exhaust vent of the air conditioning unit, and the air inlet area on the exterior facade corresponds to the air inlet of the air conditioning unit.

[0013] The air conditioning unit heat exchanger air duct is composed of a built-in air inlet, heat exchanger, negative pressure chamber, fan, exhaust chamber, and exhaust outlet connected in series; the external facade air inlet area, the air conditioning unit heat exchanger air duct, and the external facade exhaust area are connected in series to form the air duct inside the equipment platform; the present invention does not rely on the longitudinal air duct caused by the lateral spacing between air conditioning units for air supply and exhaust, and the air duct is built-in.

[0014] 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.

[0015] Furthermore, 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 lower part of the facade.

[0016] Preferably, the boundary between the exhaust area and the air intake area of ​​the facade is a horizontal straight line or the boundary line is close to a horizontal straight line.

[0017] Furthermore, the area of ​​the exhaust zone on the facade is 25% to 50% of the facade area used for ventilation.

[0018] Furthermore, the outer concrete structural columns of the equipment platform serve as the starting and ending points for the horizontal movement of the air conditioning unit; the inner space of the outer concrete structural columns serves as the dwelling area and buffer zone for the longitudinal and lateral movement of the air conditioning unit.

[0019] Furthermore, the air conditioning unit includes a housing, a finned tube heat exchanger assembly, an air conditioning compressor, a gas-liquid separator, and a fan;

[0020] The finned tube heat exchanger assembly consists of at least two flat-plate finned tube heat exchanger groups; or it consists of a V-shaped finned tube heat exchanger formed by bending flat-plate finned tube heat exchangers; or it consists 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 fin is a broken line type.

[0021] The long side of the fins of the flat plate finned tube heat exchanger is set in the vertical direction or close to the vertical direction.

[0022] The finned tube heat exchanger assembly is located at the air inlet of the shell and forms a negative pressure chamber of the heat exchanger assembly with at least a portion of the shell, which is connected to the heat exchange air path.

[0023] Furthermore, the cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fin is V-shaped or N-shaped, or it is composed of at least two finned tube heat exchangers with V-shaped cross-sections perpendicular to the long side of the fin continuously arranged; preferably, the cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fin is W-shaped; preferably, the apex angle α of the V-shaped finned tube heat exchanger is 15° to 110°.

[0024] Preferably, the apex angle α of the V-shaped finned tube heat exchanger is 30° to 90°.

[0025] Preferably, the apex angle α of the V-shaped finned tube heat exchanger is 30° to 60°.

[0026] Furthermore, the bottom plate, side plate, back plate, top plate, and finned tube heat exchanger assembly of the shell 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.

[0027] Preferably, the back plate or top plate is provided with an air outlet for the negative pressure chamber of the heat exchanger assembly;

[0028] 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.

[0029] Furthermore, the air outlet of the negative pressure chamber of the heat exchanger assembly is provided with an exhaust chamber; preferably, the exhaust port of the exhaust chamber faces the short side of the air conditioner main unit housing.

[0030] Furthermore, the horizontal spacing of the air conditioning unit is 50-150mm.

[0031] Furthermore, the bottom plate at the air inlet of the housing is provided with at least one air supply slot that connects to the space below the bottom plate. The space below the bottom plate connects to the atmospheric environment outside the exterior of the equipment platform and forms a bottom air intake channel.

[0032] Furthermore, the bottom of the housing is provided with a heightening bracket for mounting the finned tube heat exchanger assembly;

[0033] The space expanded by the heightening bracket at the bottom of the finned tube heat exchanger assembly is connected to the air supply slot, forming the bottom air intake channel of the air conditioning unit.

[0034] Compared with the prior art, the present invention has the following significant advantages:

[0035] This invention utilizes an external corridor-style equipment platform for air conditioning units with zigzag-shaped finned tube heat exchangers. Addressing technical issues such as low energy density of the air conditioning unit and equipment platform, and excessive lateral width occupation of the equipment platform on the building facade, this invention achieves its goals by employing a high-power-density air conditioning unit, innovating the inlet and outlet airflow structure of the finned tube heat exchanger assembly, reorganizing the relationship between the finned tube heat exchanger airflow and the equipment platform facade, and developing an innovative structural relationship between the air conditioning unit and the equipment platform to utilize idle and inefficient space within the equipment platform. This results in a heavy-duty equipment platform for the air conditioning unit. Its innovations include:

[0036] 1. Construct a short-path, low-resistance airflow system for the external heat exchanger of the air conditioning unit that integrates internal and external components.

[0037] This invention addresses the practical application scenario where the net height of a central air conditioning unit platform exceeds 4m. It establishes an aerodynamic layout of "medium-speed air intake on the lower part of the equipment platform facade and the air conditioning unit, and high-speed air exhaust at the top, with the air inlet and exhaust outlets 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 air conditioning unit heat exchanger assembly, thus developing the air duct function of the idle space at the top of the equipment platform.

[0038] In this invention, under the design concept that the exhaust area on the exterior of the equipment platform is 25% to 50% of the exterior area used for ventilation, the exhaust velocity of the exterior exhaust area is more than twice that of the intake velocity of the exterior intake area, and the exhaust dynamic pressure head is more than four times that of the intake dynamic pressure head. This effectively improves the exhaust velocity and kinetic energy of the air conditioning unit finned tube heat exchanger assembly, and effectively improves the range and diffusion dilution effect of the exhaust air penetrating the exterior of the equipment platform and entering the ambient atmosphere.

[0039] This invention incorporates the main sections of the air inlet and exhaust channels of the air conditioning unit's finned tube heat exchanger assembly into the air conditioning unit. The air inlet and exhaust outlets of the air conditioning unit are arranged in the same direction, on the same side, and vertically on the outer facade of the equipment platform, thus constructing a short-path, low-resistance airflow system for the external heat exchanger of the air conditioning unit that integrates internal and external connections.

[0040] 2. Increase the power density of the equipment platform and reduce the footprint of the equipment platform.

[0041] The air conditioning unit used in this invention uses flat-plate finned tube heat exchangers and V-shaped finned tube heat exchangers bent from flat-plate finned tubes as the basic units of the air conditioning unit's finned tube heat exchanger assembly. Within the limited space of the air conditioning unit, the finned tube heat exchanger assembly is continuously arranged, creating a large area of ​​heat exchanger ventilation surface. A second, large area of ​​finned heat transfer surface is then created on this large ventilation surface, 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, thus constructing an air conditioning unit with "heavy load" characteristics.

[0042] Based on the heavy-duty air conditioning unit, this invention innovates the equipment platform layout by incorporating a heat exchanger fresh air duct inside the air conditioning unit, developing the exhaust duct function of the idle space on the top of the equipment platform, and reducing the lateral spacing between air conditioning units.

[0043] By combining pedestrian walkways, maintenance walkways, and copper pipe cable trays into a single unit, the area occupied by ineffective and inefficient spaces and ventilation blind spots on the equipment platform is significantly reduced. This increases the average cooling and heating power density (i.e., cooling and heating capacity per unit area) of the equipment platform from the current approximately 11.6 kW / ㎡ to over 25 kW / ㎡, an increase of over 100%. Under the same cooling and heating load, the area of ​​the equipment platform is reduced by more than half.

[0044] 3. Reduce the horizontal width of the equipment platform facade occupied by the air inlet and outlet surfaces of the air conditioning unit.

[0045] 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 platform facade, which obstructs ventilation, lighting, and visual communication between the interior space of the same floor and the external environment. This has become a prominent problem in building HVAC design.

[0046] This invention improves the power density of the air conditioning unit by reorganizing the air inlet and outlet paths of the finned tube heat exchanger assembly of the air conditioning unit. It also reorganizes the spatial structure 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, the footprint of the equipment platform is significantly reduced, as is the lateral width of the building equipment platform facade occupied by the air inlet and outlet surfaces of the air conditioning unit. This ensures ventilation, lighting, and visual communication between the interior space of the same floor and the external environment, and minimizes the impact of vibration and noise from the air conditioning unit on the working environment.

[0047] 4. Convenient air conditioner unit inspection and repair

[0048] The air conditioning unit used in this invention centrally houses the refrigerant circuit components, such as the compressor, gas-liquid separator, four-way valve, expansion valve, electrical box, and fan, within the negative pressure chamber of the heat exchanger assembly.

[0049] This invention restructures the spatial relationship between the air conditioning unit and the equipment platform. During installation, the back panel of the negative pressure chamber of the air conditioning unit's external heat exchanger faces the three-in-one channel inside the equipment platform, facilitating the inspection and maintenance of the air conditioning unit. When the air conditioning unit malfunctions, opening the back panel through the maintenance channel inside the equipment platform provides a clear view of potentially faulty components such as the compressor, gas-liquid separator, four-way valve, expansion valve, electrical box, and fan, making inspection and maintenance extremely convenient. This invention solves the inherent inspection and maintenance challenges of air conditioning units.

[0050] This invention utilizes multiple V-shaped openings on the base plate of the air conditioning unit that match the bottom structure of the finned tube heat exchanger assembly. By connecting the space below the base plate to the atmospheric environment outside the equipment platform's facade, it supplies fresh air to the lower and middle finned tubes of the finned tube heat exchanger, improving the ventilation and heat exchange effect of the lower and middle finned tubes of the finned tube heat exchanger. This solves the problem of vertical unevenness in ventilation and heat exchange, where the ventilation and heat exchange is "stronger at the top and weaker at the bottom," in traditional top-discharge air conditioning unit external heat exchangers. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the vertical structure of the air conditioning unit platform;

[0052] Figure 2 This is a top view of the air conditioning unit platform.

[0053] Figure 3A schematic diagram of the airflow during operation on the air conditioning unit platform;

[0054] Figure 4 This is a three-dimensional structural diagram of the air conditioning unit in Example 1;

[0055] Figure 5 This is a vertical sectional view of the air conditioning unit in Example 1;

[0056] Figure 6 This is a schematic diagram of the airflow operation of the air conditioning unit in Example 1;

[0057] Figure 7 This is a side view of the air conditioning unit of Example 1;

[0058] Figure 8 for Figure 7 Three horizontal sectional views;

[0059] Figure 9 A three-dimensional structural diagram of a horizontal V-shaped finned tube heat exchanger;

[0060] Figure 10 A three-dimensional structural diagram of a horizontal V-shaped finned tube heat exchanger assembly;

[0061] Figure 11 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 and performs a stepped planing to slow it down before it enters the fin gap for heat exchange and is then discharged.

[0062] Figure 12 This is a top view of the central air conditioning unit platform section between the building structural columns in Example 2;

[0063] Figure 13 This is a schematic diagram of the air duct operation of the central air conditioning unit platform section between the building structural columns in Example 2;

[0064] Figure 14 This is a three-dimensional structural diagram of the air conditioning unit in Example 3, where the heat exchanger is raised to create a bottom air supply channel.

[0065] Figure 15 This is a top view of the air conditioning unit in Example 3, where the heat exchanger is raised to create a bottom air supply channel.

[0066] Figure 16 This is a vertical cross-sectional view of the airflow of the air conditioning unit in Example 3, where the heat exchanger is raised to create a bottom air supply channel.

[0067] Figure 17 This is a schematic diagram showing the relationship between the air intake and exhaust areas on the exterior of the equipment platform. Detailed Implementation

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Example 1

[0073] like Figure 1-3 As shown, an air conditioning unit equipment platform has a row of air conditioning units arranged horizontally within the platform;

[0074] The equipment platform has an exterior facade 1 for ventilation, and the air inlet 125 of the air conditioning unit is close to the exterior facade 1; the exhaust outlet 331 of the exhaust cavity 33 is close to the exterior facade 1; the exhaust outlet 331 of the exhaust cavity 33 is located on the same side as the air inlet 125 of the air conditioning unit. The exhaust outlet 331 of the exhaust cavity 33 faces the short side of the air conditioning unit housing.

[0075] The exhaust area on facade 1 corresponds to the exhaust port 331 of the air conditioning unit, and the air inlet area on facade 1 corresponds to the air inlet 125 of the air conditioning unit.

[0076] The air intake area, air inlet 125, negative pressure chamber 124 of the air conditioning unit, exhaust chamber 33, exhaust outlet 331 and exhaust area constitute the air duct inside the equipment platform;

[0077] 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.

[0078] The refrigerant connection pipe 81 or the chilled water connection pipe is installed on the cable tray 8. The air conditioning main unit module is connected to the air conditioning indoor units or fan coil units of each floor and area of ​​the building through the refrigerant connection pipe 81 or the chilled water connection pipe. The air conditioning main unit module works together with the indoor units / fan coil units to cool (heat) the indoor space of the building.

[0079] The exhaust areas on facade 1 are arranged continuously on the upper part of the facade, and the air intake areas on facade 1 are arranged continuously on the middle and lower parts of the facade.

[0080] The boundary between the exhaust area and the air intake area of ​​facade 1 is a horizontal straight line or a boundary line that is close to a horizontal straight line.

[0081] The area of ​​the exhaust zone on facade 1 is 25% to 50% of the facade area used for ventilation.

[0082] like Figure 4-8 As shown, the air conditioning unit of this embodiment includes a housing, a finned tube heat exchanger assembly, an air conditioning compressor 121, a gas-liquid separator 126, and a fan 38.

[0083] 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.

[0084] 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; the finned tube heat exchanger assembly is the air inlet of the negative pressure chamber 124 of the heat exchanger assembly.

[0085] An air outlet for the negative pressure chamber 124 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 124 of the heat exchanger assembly.

[0086] An exhaust chamber 33 is provided at the air outlet of the negative pressure chamber of the heat exchanger assembly.

[0087] Fan 38 is an axial flow fan.

[0088] 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, expansion valve, electrical box, etc., are located in the ventilation blind zone inside the negative pressure chamber 124 of the heat exchanger assembly.

[0089] In this embodiment, the side plate at the air inlet 125 of the shell is also provided with several through holes 138 for air intake of the finned tube heat exchanger; the through holes 138 and the air inlet 125 of the shell constitute the air intake channel of the finned tube heat exchanger assembly.

[0090] like Figure 9-11 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] The apex angle α of the V-shaped finned tube heat exchanger is 15° to 110°.

[0095] As an optional implementation, the apex angle α of the V-shaped finned tube heat exchanger is 30° to 90°.

[0096] As an optional implementation, the apex angle α of the V-shaped finned tube heat exchanger is 30° to 60°.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] δ=d·sinα / 2, where α is the apex angle of the V-shaped finned tube heat exchanger;

[0101] 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.

[0102] 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.

[0103] 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.

[0104] This embodiment innovatively uses evaporation pressure (evaporation temperature) as the primary factor in 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 20% simultaneously, and the compressor's compression ratio and compressor discharge temperature will also drop accordingly.

[0105] This embodiment innovatively analyzes the relationship between the heat transfer capacity Q of finned tube heat exchangers such as air conditioner evaporators and condensers, the overall heat transfer coefficient K, the heat transfer area S, and the heat transfer temperature difference Δt between the refrigerant and the air, using the formula Q = K × S × Δt. It proposes the technical judgment that "the key factor in 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 lies in increasing the total heat transfer area S of the finned tube heat exchanger."

[0106] 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 large-scale refrigeration and air conditioning systems constructed with the participation of heat exchangers.

[0107] like Figure 4As 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 body heat transfer temperature difference (T2-T1), the high-temperature heat source and low-temperature heat source temperature difference (T1-t1), and the evaporator body 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, the innovative reduction of the heat transfer temperature difference between the condenser body (T2-T1) and the evaporator body (t1-t2) is the only way to reduce the difference between the condensing temperature and the evaporating temperature (T2-t2) in 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.

[0108] 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.

[0109] At the airflow inlet section EE, the medium-speed airflow of about 4 m / s, flowing in from the outer facade 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 has been decelerated by the collision and diffusion, is pulled by the negative pressure of the negative pressure chamber and overcomes the resistance of the fin gap channel to flow out of the fin channel. 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.

[0110] The air conditioning unit platform in this embodiment innovatively optimizes the structure of the air inlet and outlet air field of the building equipment platform, as well as the energy coupling characteristics between the air conditioning unit and the equipment platform, based on thermodynamics and fluid mechanics.

[0111] In terms of application scenario transformation, this invention changes the location of the air conditioning unit 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 transformed from a classic hemispherical three-dimensional open space to a semi-enclosed corridor with one side open.

[0112] This embodiment of the air conditioning unit platform addresses the issues of low energy density of the air conditioning unit and equipment platform, and excessive horizontal width occupied by the equipment platform on the building facade. Based on the reorganization of the air conditioning unit structure and the external heat exchanger airflow, the spatial relationship between the air conditioning unit and the equipment platform, and the relationship between the external heat exchanger airflow and the equipment platform facade, it has the following innovations:

[0113] 1. High power density air conditioning unit

[0114] The air conditioning unit used in this embodiment has an air inlet and an exhaust outlet set on the same side and at different heights, with an aerodynamic layout of medium-speed air intake in the lower middle part on the same side and high-speed air exhaust at the top.

[0115] In this embodiment, a horizontal V-shaped finned tube heat exchanger is used as the basic unit of the finned tube heat exchanger assembly. Within the limited space of the air conditioning unit, the finned tube heat exchanger assembly is continuously arranged parallel to the air inlet of the air conditioning unit. It is spread out along the air inlet of multiple horizontal V-shaped finned tube heat exchangers to obtain a large area of ​​finned tube heat exchanger assembly ventilation surface. It is then spread out again on the large area of ​​finned tube heat exchanger assembly ventilation surface to obtain a huge area of ​​fin heat transfer surface. This effectively increases the total heat transfer area S of the finned tube heat exchanger assembly of the air conditioning unit, reduces the heat transfer temperature difference ΔT of the heat exchanger body, increases the evaporation pressure and reduces the condensation pressure. It has high power density characteristics and becomes the source of the "heavy load" of the heavy load equipment platform in this embodiment.

[0116] The air conditioning unit body used in this embodiment has one heat exchanger assembly negative pressure chamber, which is composed of a bottom plate, side plate, back plate, finned tube external heat exchanger, and top plate. The air outlet of the heat exchanger assembly negative pressure chamber is located on the top plate, away from the horizontally continuous V-shaped finned tube heat exchanger, and a fan is installed at the air outlet. The horizontally continuous V-shaped finned tube heat exchanger serves as the air inlet of the heat exchanger assembly negative pressure chamber. An exhaust chamber is located above the top plate of the heat exchanger assembly negative pressure chamber, and the air inlet of the exhaust chamber connects to the air outlet of the heat exchanger assembly negative pressure chamber.

[0117] The area below the air outlet of the negative pressure chamber of the heat exchanger assembly, adjacent to the back panel, is a ventilation blind spot. The air conditioning unit compressor, four-way valve, expansion valve, electrical box, and other refrigerant circuit components are located in the ventilation blind spot.

[0118] The ratio of the cooling capacity of the air conditioning unit to the floor space occupied by the air conditioning unit is defined as the "power density of the air conditioning unit". The air conditioning unit used in this embodiment has the characteristic of high power density.

[0119] 2. Innovate the air inlet and outlet airflow of the air conditioning unit finned tube heat exchanger assembly, and reorganize the relationship between the airflow path of the air conditioning unit finned tube heat exchanger assembly and the external facade of the equipment platform.

[0120] like Figure 17 As shown, the air conditioning unit heat exchanger air duct is composed of a built-in air inlet, heat exchanger, negative pressure chamber, fan, exhaust chamber, and exhaust outlet connected in series; the external facade air inlet area, the air conditioning unit heat exchanger air duct, and the external facade exhaust area are connected in series to form the air duct inside the equipment platform; the present invention does not rely on the longitudinal air duct caused by the lateral spacing between air conditioning units for air supply and exhaust, and the air duct is built-in.

[0121] The air conditioning unit used in this embodiment utilizes the unused space at the top of the equipment platform to set up the air exhaust chamber of the air conditioning unit; the exhaust port of the air exhaust chamber of the air conditioning unit is set on the same side and above and below the air inlet of the air inlet channel, and the area of ​​the exhaust port is significantly smaller than the area of ​​the air inlet.

[0122] In this embodiment, the air conditioning unit establishes the inlet and outlet airflow of the air conditioning unit's finned tube heat exchanger assembly through fan operation:

[0123] The fan draws air from the negative pressure chamber of the heat exchanger assembly, creating a negative pressure inside the chamber. This draws ambient air at medium speed from the air inlet of the air conditioning unit into the unit. The medium-speed airflow inside the unit is dispersed and slowed down by the successive planing of multiple finned blades. It then flows at low speed through the gaps between the fins of the V-shaped finned tube heat exchanger to complete heat exchange. After that, it enters the negative pressure chamber of the heat exchanger assembly, where it is further drawn and gathered by the negative pressure. It then accelerates and flows into the fan inlet, where the pressure is lowest. Finally, it is drawn in by the fan, pressurized, and discharged at high speed through the exhaust chamber to the exterior facade.

[0124] In this embodiment, the main sections of the air inlet and exhaust channels of the finned tube heat exchanger assembly are incorporated into the air conditioning unit.

[0125] In this embodiment, a single row of air conditioning units is horizontally arranged adjacent to each other on the equipment platform. The air intake duct of the air conditioning unit directly introduces fresh air from the exterior of the equipment platform, eliminating the need for the rear air conditioning unit to bypass the front air conditioning unit's air intake and supply duct in the traditional dual-row air conditioning unit setup. In this embodiment, the air conditioning unit exhaust adopts an upward air outlet mode, with the exhaust air from the finned tube heat exchanger assembly directly discharged into the ambient atmosphere outside the exterior of the equipment platform.

[0126] This embodiment uses the shortest side-in, side-out path to reorganize the relationship between the air conditioning unit heat exchanger air duct and the equipment platform facade.

[0127] 3. Innovate the structural relationship between the air conditioning unit and the equipment platform, and develop idle and inefficient space on the equipment platform.

[0128] In this embodiment, an exhaust chamber is set up in the unused and inefficient space at the top of the equipment platform above the top plate of the air conditioning unit;

[0129] In this embodiment, the horizontal spacing of the air conditioning unit is compressed to about 100mm, which is sufficient to allow for vertical pulling out or vertical feeding of the air conditioning unit.

[0130] In this embodiment, a three-in-one passage is set up between the inner wall of the equipment platform and the horizontally arranged air conditioning units, serving as a pedestrian walkway, a maintenance area, and a space for installing copper pipes and cable trays for the air conditioning system. Above the passage, a cable tray is installed 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, achieving a "three-in-one" combination of pedestrian walkway and maintenance cable tray.

[0131] This embodiment innovates the structural relationship between the air conditioning unit and the equipment platform. By setting up the air exhaust cavity of the air conditioning unit in the idle and inefficient space on the top of the equipment platform, compressing the lateral spacing between adjacent air conditioning units, and implementing the "three-in-one" approach of pedestrian passage, maintenance passage, and cable tray passage, the idle and inefficient space of the equipment platform is fully developed and utilized.

[0132] Example 2

[0133] like Figure 12-13 As shown, the air conditioning unit equipment platform in this embodiment is similar to that in embodiment 1. Furthermore, in this embodiment, the outer concrete structure column 140 serves as the starting and ending points for the horizontal setting of the air conditioning unit.

[0134] The inner space 5 of the outer concrete structural column 140 is the dwelling area and buffer zone for the longitudinal and lateral movement of the air conditioning unit.

[0135] In this embodiment, the inner space 5 of the outer concrete structural column 140 is used as the dwelling area and buffer zone of the air conditioning unit, so as to realize the sequential movement of multiple air conditioning units and the large longitudinal and lateral movement of a single air conditioning unit under a specific functional objective, which facilitates installation, maintenance and repair.

[0136] Example 3

[0137] like Figure 14-16 As shown, the air conditioning unit platform in this embodiment is similar to that in embodiment 1. Furthermore, in this embodiment, the air conditioning unit has two make-up air slots 141 on the bottom plate at the air inlet 125 of its housing, which are connected to the space below the bottom plate. The space below the bottom plate is connected to the outer atmospheric environment of the outer facade 1 of the equipment platform and forms the bottom air inlet channel 135.

[0138] The bottom of the casing is provided with a heightening bracket 136 for mounting the finned tube heat exchanger assembly;

[0139] The space extended by the heightening bracket 136 at the bottom of the finned tube heat exchanger assembly and the air supply slot 141 are connected to form the bottom air intake channel 135 of the air conditioning unit.

[0140] In this embodiment, multiple V-shaped openings on the base plate of the air conditioning unit, which match the bottom structure of the finned tube heat exchanger assembly, allow fresh air to be supplied to the lower and middle finned tubes of the finned tube heat exchanger through the space below the base plate that connects to the atmospheric environment outside the outer facade of the equipment platform. This improves the ventilation and heat exchange effect of the lower and middle finned tubes of the finned tube heat exchanger and solves the problem of vertical unevenness in ventilation and heat exchange of traditional top-discharge air conditioning unit external heat exchangers, which is "stronger at the top and weaker at the bottom".

[0141] 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 external corridor-type equipment platform employing a zigzag-shaped finned tube heat exchanger air conditioning unit, characterized in that, At least one row of air conditioning units is installed horizontally within the equipment platform; The equipment platform has an exterior facade for ventilation, and the air inlet of the air conditioning unit is close to the exterior facade; the exhaust outlet of the exhaust chamber is located and / or close to the exterior facade; the exhaust outlet of the exhaust chamber is located on the same side as the air inlet of the air conditioning unit. The exhaust area on the exterior facade corresponds to the exhaust vent of the air conditioning unit, and the air inlet area on the exterior facade corresponds to the air inlet of the air conditioning unit. The air conditioning unit heat exchanger air duct is composed of an air inlet, a finned tube heat exchanger, a negative pressure chamber, a fan, an exhaust chamber, and an exhaust outlet connected in series; the external facade air inlet area, the air conditioning unit heat exchanger air duct, and the external facade exhaust area are connected in series to form the air duct inside the equipment platform. 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. The air conditioning unit includes a housing, a finned tube heat exchanger assembly, an air conditioning compressor, a gas-liquid separator, and a fan; the gas-liquid separator, air conditioning compressor, four-way valve, finned tube heat exchanger assembly, expansion valve, and refrigerant pipeline of the indoor unit of the air conditioning unit are sequentially connected to form a refrigerant circulation loop of the air conditioning system; The finned tube heat exchanger assembly is composed of a V-shaped finned tube heat exchanger consisting of at least two flat-plate finned tube heat exchangers; or a V-shaped finned tube heat exchanger formed by bending flat-plate finned tube heat exchangers; or a combination 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 in the flat plate finned tube heat exchanger is arranged vertically. The finned tube heat exchanger assembly is located at the air inlet of the shell and forms a negative pressure chamber of the heat exchanger assembly with at least a portion of the shell, which is connected to the heat exchange air path. The bottom plate, side plate, back plate, top plate, and finned tube heat exchanger assembly of the shell 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. The air inlet 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 air outlet side is the air outlet side of the heat exchanger assembly; the air outlet side belongs to the negative pressure chamber area 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. The angle between the inlet airflow and the tip of each finned plate on each flat finned tube heat exchanger is an obtuse angle β. The inlet airflow strikes the tip of each finned plate in the finned tube heat exchanger assembly at an obtuse angle β, is reflected by the fin tip plate, enters the fin gap, and flows into the negative pressure chamber of the heat exchanger assembly. The obtuse angle β is 97.5° to 145°; 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 corridor-type equipment platform for an air conditioning unit employing a zigzag-shaped finned tube heat exchanger as described in claim 1, 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.

3. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 1, characterized in that... The boundary between the exhaust area and the air intake area of ​​the facade is a horizontal straight line.

4. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 1, characterized in that... The area of ​​the exhaust zone on the facade is 25% to 50% of the facade area used for ventilation.

5. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 1, characterized in that, The outer concrete structural columns of the equipment platform serve as the starting and ending points for the horizontal movement of the air conditioning unit; the inner space of the outer concrete structural columns serves as the dwelling area and buffer zone for the longitudinal and lateral movement of the air conditioning unit.

6. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 5, 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.

7. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 5, characterized in that, The cross-section of the finned tube heat exchanger assembly perpendicular to the long side of the fins is W-shaped.

8. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 6, characterized in that, The apex angle α of the V-shaped finned tube heat exchanger is 15° to 110°.

9. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 1, 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.

10. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 9, characterized in that, The air outlet of the negative pressure chamber of the heat exchanger assembly is provided with an exhaust chamber.

11. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 10, characterized in that, The exhaust port of the exhaust chamber faces the short side of the air conditioner unit housing.

12. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 1, characterized in that, At least one air supply slot is provided on the bottom plate at the air inlet of the housing, which connects to the space below the bottom plate. The space below the bottom plate connects to the atmospheric environment outside the exterior of the equipment platform and forms a bottom air inlet channel (135).

13. The corridor-type equipment platform for an air conditioning unit employing a zigzag finned tube heat exchanger as described in claim 12, characterized in that, The bottom of the housing is provided with a heightening bracket for mounting the finned tube heat exchanger assembly; The space extended by the heightening bracket at the bottom of the finned tube heat exchanger assembly is connected to the air supply slot, forming the bottom air intake channel (135) of the air conditioning unit.

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