A fan-coil unit suitable for high-humidity areas along the Yangtze River

Abstract

The utility model discloses a fan -coil unit suitable for high humidity area along the Yangtze river relates to air conditioning equipment field. Including the casing, be equipped with heat exchange device in casing inner chamber, and the casing inner chamber intercommunication sends the air supply unit, by the air supply unit and heat exchange device carry out heat exchange to the airflow input to the casing, heat exchange device includes heat exchange pipe, water inlet distribution pipe and water outlet header pipe, and heat exchange pipe is in the casing and is distributed in the shape of snake, and heat exchange pipe outer surface is equipped with hydrophilic aluminum foil fin, and the hydrophilic aluminum foil fin is used for the moisture in airflow forms continuous water film, the air supply unit input casing inner chamber's airflow and hydrophilic aluminum foil fin contact and form thermal bridge, and heat exchange device has counterflow structure, and the water inlet of water inlet distribution pipe is set up near the air outlet side of fan -coil unit, and the water outlet of water outlet header pipe is set up near the air inlet side. The utility model has solved the problem that the indoor load heat and humidity ratio and the heat and humidity ratio of conventional fan -coil unit equipment are seriously mismatched in plum rain season in high humidity area along the Yangtze river.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning equipment technology, specifically to a fan coil unit suitable for high humidity areas along the Yangtze River. Background Technology

[0002] In the hot-summer, cold-winter regions along the Yangtze River in China, there is a significant climatic characteristic: every year between spring and summer, there is usually a period of plum rain or sauna-like weather lasting one to two months. During this time, the ambient temperature often remains around 30°C, while the relative humidity of the air is close to saturation, resulting in extremely humid indoor and outdoor environments.

[0003] Under such high humidity conditions, the ratio of indoor heat load to humidity differs significantly from that of conventional air conditioning seasons. During typical air conditioning seasons, the indoor heat-to-humidity ratio is approximately 7500; however, during the rainy season, this value typically drops to 5000-6000. Using traditional fan coil units or split-system air conditioners to treat indoor air presents a dilemma: if the equipment capacity is large enough, while it can meet dehumidification requirements, it may lead to excessively low indoor temperatures, exceeding comfort levels; if the capacity is too small, although it can control the temperature at a suitable level, its dehumidification capacity is insufficient, failing to effectively reduce humidity.

[0004] The root cause of this contradiction lies in the structural and adjustment limitations of traditional equipment. Conventional fan coil units typically employ a 2- or 3-row pipe design, and under 7℃ water supply conditions, their heat-to-moisture ratio is approximately 8000-10000. Furthermore, their airflow adjustment usually only offers three levels: high, medium, and low, failing to achieve fine-tuning. Therefore, during high-humidity conditions such as the rainy season, the equipment's heat-to-moisture ratio is far higher than the actual indoor load demand, resulting in a mismatch between heat and humidity handling capabilities and making it difficult to simultaneously stabilize temperature and humidity within a comfortable range.

[0005] To alleviate this problem, existing technologies often require additional reheat equipment for precise temperature control or the addition of a compressor-type dehumidifier specifically for humidity control. This not only significantly increases system energy consumption but also generates considerable operating noise, resulting in unsatisfactory overall energy efficiency and comfort. Utility Model Content

[0006] The purpose of this invention is to provide a fan coil unit suitable for high-humidity areas along the Yangtze River. By setting up a heat exchange device with a counter-flow structure, and arranging multiple rows of heat exchange tubes inside the heat exchange device, as well as hydrophilic aluminum foil fins on the outer surface of the heat exchange tubes, the fan coil unit has a wide range of heat-to-moisture ratios between 4000 and 10000, thus solving the problem of a serious mismatch between the heat-to-moisture ratio of indoor loads and that of conventional fan coil units during the plum rain season in high-humidity areas along the Yangtze River.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A fan coil unit suitable for high-humidity areas along the Yangtze River includes a housing. A heat exchange device is provided in the inner cavity of the housing. The inner cavity of the housing is connected to an air supply unit, which inputs airflow into the housing to exchange heat with the heat exchange device. The heat exchange device includes heat exchange tubes, an inlet water distribution pipe, and an outlet water collection pipe. The heat exchange tubes are distributed in a serpentine pattern inside the housing, and the outer surface of the heat exchange tubes is provided with hydrophilic aluminum foil fins. The hydrophilic aluminum foil fins are used to form a continuous water film of moisture in the airflow. In this system, the airflow entering the inner cavity of the air supply unit contacts the hydrophilic aluminum foil fins and forms a thermal bridge. The heat exchange device has a counter-current structure. The inlet of the water inlet distribution pipe is located near the air outlet side of the fan coil unit, and the outlet of the water outlet collection pipe is located near the air inlet side.

[0008] This invention utilizes a heat exchange device with hydrophilic aluminum foil fins on multiple rows of serpentine heat exchange tubes. These fins allow condensate to quickly form a water film and flow away, reducing wind resistance and preventing water droplets from being carried away by the airflow of the air supply unit. This ensures effective dehumidification and operational stability, maintaining the effective heat exchange area at its maximum. It also reduces airflow resistance, ensuring all tubes fully participate in heat and moisture exchange, thereby maximizing dehumidification and cooling capacity. Simultaneously, the inlet of the water distribution pipe of the heat exchange device is positioned near the outlet side of the fan coil unit, while the outlet of the water collection pipe is positioned near the inlet side, creating a counter-flow structure. This increases the average temperature difference between the heat exchange medium (cold water) and the air, especially ensuring that the air near the outlet side is treated by the coldest water, thus reducing the moisture content of the outlet air to a very low level. This heat exchange device enables fan coil units to have a wide heat-to-moisture ratio range of 4,000 to 10,000 under standard water supply temperature, which can naturally match the low heat-to-moisture ratio load of 5,000-6,000 indoors during the plum rain season along the Yangtze River. This solves the problem of serious mismatch between the heat-to-moisture ratio of indoor loads and the heat-to-moisture ratio of conventional fan coil equipment during the plum rain season in high-humidity areas along the Yangtze River.

[0009] Furthermore, the heat exchange tubes are arranged in multiple rows, with the multiple rows of heat exchange tubes arranged in parallel and connected sequentially to form a serpentine shape.

[0010] The parallel and sequential connection of multiple pipelines maximizes the heat exchange area and air contact time within a limited space, significantly increasing the total heat exchange area and thus greatly improving the cooling and dehumidification capacity per unit air volume. The longer contact time between the air and the cold surface is beneficial for deep cooling and dehumidification.

[0011] The heat exchange device of this invention preferably uses 6 rows of copper heat exchange tubes. Compared with the traditional 2-3 rows of tubes, 6 rows of tubes provide a huge heat exchange area, allowing for more thorough and longer-lasting heat and moisture exchange between the air and the low-temperature chilled water. The pure counter-current design ensures that the cold water inlet side meets the departing cold air, guaranteeing the maximum heat exchange temperature difference, and especially reducing the dew point temperature of the outlet air to a very low level, thereby achieving deep dehumidification. This significantly enhances the dehumidification capacity of the equipment at the same water temperature and air volume, thus naturally enabling it to achieve a lower heat-to-moisture ratio.

[0012] Furthermore, the outer wall of the shell is provided with an inlet water distribution pipe and an outlet water collection pipe. The two ends of the heat exchange tube are respectively connected to the inlet water distribution pipe and the outlet water collection pipe. The inlet water distribution pipe is used to input the heat exchange medium into the heat exchange tube, and the heat exchange medium in the heat exchange tube is output through the outlet water collection pipe.

[0013] Furthermore, the air supply unit is a DC brushless permanent magnet fan, and the DC brushless permanent magnet fan achieves stepless adjustment of the fan speed through an external fan control box.

[0014] The air supply unit of this invention is a DC brushless permanent magnet fan, and stepless speed regulation is achieved through an external fan control box. The fan control box only needs to be capable of stepless speed regulation; existing fan control boxes can be used directly or modified. This invention preferably uses a stepless speed regulation fan control box. Stepless speed regulation allows for extremely fine adjustment of airflow. Furthermore, DC fans are inherently more efficient, resulting in significant energy savings during low-airflow operation and lower noise levels.

[0015] It can also be used as a continuously variable speed (CVS) fan control box, connecting an existing CVS control panel. The CVS control panel and the CVS fan control box communicate with each other. Users set parameters through the CVS temperature control panel, the control panel sends commands, and the control box, upon receiving the commands, drives the fan to the specified speed, thus achieving precise control of the airflow through the heat exchanger. In this process, continuous parameter settings and continuous changes in fan speed directly lead to continuous changes in airflow. These changes in airflow significantly affect the heat exchange efficiency of the air flowing through the heat exchanger, ultimately achieving precise control of the heat-to-moisture ratio of the entire fan coil unit.

[0016] In addition, the continuously variable speed control panel can be connected to the external mixing valve of the fan coil unit to adjust the supply water temperature. As an intelligent control center, the temperature control panel precisely controls the operation of the external mixing valve via electrical signals, automatically adjusting the mixing ratio of cold water entering the fan coil unit and returning water, thereby achieving precise control of the supply water temperature.

[0017] With the external stepless speed control fan control box and stepless speed control panel, the fan coil unit of this utility model can be steplessly adjusted to any air volume. Combined with the adjustment of the water supply temperature, it can adapt to the load requirements of different seasons in the room without the need to add other air handling equipment. For example, it can be used for year-round moisture prevention in basements, dehumidification in the rainy season in bedrooms and other ordinary spaces, cooling in summer, and heating in winter.

[0018] Furthermore, the DC brushless permanent magnet fan is positioned between the heat exchange device and the air outlet to drive air to flow in from the air inlet, be processed by the heat exchange device, and then flow out from the air outlet.

[0019] The fan is located behind the heat exchange device, forming a blow-out structure. The airflow is stable, which is conducive to the uniform passage of the heat exchange device, ensuring the heat exchange effect, and preventing the fan motor from being corroded by condensate.

[0020] Furthermore, the inner cavity of the shell is also provided with a condensate pan, which is located below the heat exchange device.

[0021] Furthermore, the condensate pan is provided with a condensate outlet, which is located outside the housing.

[0022] The condensate pan effectively collects and drains large amounts of condensate, preventing leaks and ensuring timely removal of condensate to avoid re-evaporation by subsequent airflow, which could affect dehumidification. The condensate outlet ensures efficient drainage.

[0023] Furthermore, mounting plates are provided at both ends of the heat exchange device, and the mounting plates are used to fix the heat exchange device in the inner cavity of the housing.

[0024] This invention uses an mounting plate to fix the relatively heavy and complex multi-row tube heat exchange device, which enhances the overall structural strength and stability of the equipment, ensures that the core components are reliably fixed under operating vibration, and extends the service life.

[0025] Compared with the prior art, the beneficial effects of this utility model are: This invention, by setting up a heat exchange device, installs hydrophilic aluminum foil fins on multiple rows of heat exchange tubes in a serpentine distribution, and forms a counter-current structure for the heat exchanger. Under standard water supply temperature, the fan coil unit has a wide range of heat-to-moisture ratio between 4000 and 10000, solving the problem of serious mismatch between the heat-to-moisture ratio of indoor load and conventional fan coil equipment during the plum rain season in high-humidity areas along the Yangtze River.

[0026] This invention employs a heat exchange device with a counter-current structure using six rows of copper heat exchange tubes. For the same airflow and water supply temperature, its cooling capacity is increased by approximately 40% compared to ordinary fan coil units. For instance, the standard cooling capacity of a conventional 850 m³ / h fan coil unit is approximately 4.5 kW, while the measured cooling capacity of this invention's six-row counter-current fan coil unit can reach approximately 6.2 kW. Therefore, under the same indoor load conditions, the fan coil unit of this invention can operate with approximately 30% less airflow, resulting in lower noise and improved indoor acoustic quality.

[0027] 3. The DC brushless permanent magnet fan of this utility model is connected to an external stepless speed-regulating fan control box and a stepless speed-regulating control panel. By adjusting the water supply temperature and fan speed, the ratio of sensible heat cooling capacity to latent heat dehumidification capacity of the equipment can be precisely controlled, so that it dynamically adapts to the load requirements of different seasons. Thus, without relying on any reheating equipment or independent dehumidifier, it can simultaneously maintain indoor temperature and humidity within a comfortable range. It can be used for dehumidification in the rainy season, cooling in summer, and heating in winter in ordinary spaces such as bedrooms. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is the left view of the present invention; Figure 4 This is a three-dimensional schematic diagram of the heat exchange device of this utility model; Figure 5 This is an internal schematic diagram of the heat exchange device of this utility model; Reference numerals in the attached drawings: 1. Shell; 2. Heat exchanger; 3. DC brushless permanent magnet fan; 4. Stepless speed regulating fan control box; 5. Water inlet; 6. Water outlet; 7. Condensate outlet; 8. Heat exchange tube; 9. Water outlet collection pipe; 10. Water inlet distribution pipe; 11. Mounting plate. Detailed Implementation

[0029] Example 1: As Figure 1-3 As shown, a fan coil unit suitable for high-humidity areas along the Yangtze River includes a housing 1. A heat exchange device 2 is provided in the inner cavity of the housing 1. The inner cavity of the housing 1 is connected to an air supply unit, which inputs airflow into the housing 1 to exchange heat with the heat exchange device 2. The heat exchange device 2 includes heat exchange tubes 8, an inlet water distribution pipe 10, and an outlet water collection pipe 9. The heat exchange tubes 8 are distributed in a serpentine pattern inside the housing 1, and the outer surface of the heat exchange tubes 8 is provided with hydrophilic aluminum foil fins. The hydrophilic aluminum foil fins are used to form a continuous water film of moisture in the airflow. In this process, the airflow entering the inner cavity of the air supply unit housing 1 comes into contact with the hydrophilic aluminum foil fins and forms a thermal bridge. The heat exchanger has a counter-current structure. The inlet 5 of the water inlet distribution pipe 10 is located near the air outlet side of the fan coil unit, and the outlet 6 of the water outlet collection pipe 9 is located near the air inlet side.

[0030] The serpentine heat exchange tubes 8 are fixed inside the shell 1, with their two ends mechanically connected to the inlet water distribution pipe 10 and the outlet water collection pipe 9, respectively, forming a closed cold water passage. Hydrophilic aluminum foil fins are tightly fitted onto the outer wall of the heat exchange tubes 8 to increase the contact area. The hydrophilic properties allow condensate to quickly spread into a water film and flow down, significantly reducing airflow resistance (wind resistance) and preventing condensate from being carried away by the airflow, thus ensuring dehumidification effect and operational stability. The inlet 5 of the inlet water distribution pipe 10 is mechanically arranged near the air outlet side, while the outlet 6 of the outlet water collection pipe 9 is mechanically arranged near the air inlet side, forming a counter-flow structure. This ensures that the coldest water first encounters the already cooled air about to leave the coil. The coldest water against the coldest air with the lowest moisture content allows for deep dehumidification, reducing the moisture content of the outlet air to an extremely low level. The air supply unit and the heat exchange device 2 form a series air duct, driving airflow through the heat exchange device 2 and providing power for the entire heat and moisture exchange process. The synergistic effect of the above structures makes the inherent heat-to-moisture ratio of this fan coil unit lower than that of traditional equipment, thus enabling it to naturally match the low heat-to-moisture ratio load during the rainy season in high-humidity regions.

[0031] In operation, the air supply unit (DC brushless fan) is activated. The fan's rotation generates negative pressure within the housing 1, drawing in warm, humid indoor air through the air inlet. The drawn-in humid air flows through the heat exchanger 2. Simultaneously, low-temperature chilled water flows in from the water inlet distribution pipe 10 on the outlet side and flows along the serpentine heat exchanger pipe 8 towards the inlet side. The coldest incoming water first encounters the air that is about to be discharged and has already undergone preliminary cooling and dehumidification. This counter-current flow arrangement deeply cools the air, lowering its temperature below the dew point, thereby maximizing moisture removal. The condensed water quickly spreads into a continuous water film (rather than water droplets obstructing airflow) on the hydrophilic aluminum foil fins and flows down the fins by gravity, being collected and discharged by the condensate tray. This ensures consistently high heat exchange efficiency and stable dehumidification. The deeply dehumidified, dry, cold air is then delivered into the room by the fan. The fan speed can be precisely adjusted according to the load requirements of different seasons through stepless speed regulation.

[0032] During the rainy / humid season, strong dehumidification and weak cooling (low heat-to-moisture ratio) are required. At this time, reducing the airflow allows for longer contact time between the air and the cold surface, resulting in more thorough dehumidification, while relatively reducing the cooling output to lower the equipment's heat-to-moisture ratio to match the indoor load. During the regular cooling season, moderate dehumidification and forced cooling (high heat-to-moisture ratio) are needed. In this case, increasing the airflow and appropriately raising the supply water temperature will increase the equipment's heat-to-moisture ratio, significantly improving system energy efficiency while ensuring comfort.

[0033] Example 2: Based on Example 1, such as Figure 5 As shown, the heat exchange tubes 8 are arranged in multiple rows, and the multiple rows of heat exchange tubes 8 are arranged in parallel and connected sequentially to form a serpentine shape.

[0034] The heat exchange tubes 8 are arranged in 6 rows. The heat exchange tubes 8 are copper tubes, and the 6 rows of copper heat exchange tubes are arranged side by side, with the first and last ones connected in sequence to form a serpentine shape. This structure maximizes the heat exchange area and air contact time within a limited space.

[0035] Example 3: Based on Example 1, such as Figure 4 and 5 As shown, the outer wall of the shell 1 is provided with an inlet water distribution pipe 10 and an outlet water collection pipe 9. The two ends of the heat exchange tube 8 are respectively connected to the inlet water distribution pipe 10 and the outlet water collection pipe 9. The inlet water distribution pipe is used to input the heat exchange medium into the heat exchange tube 8, and the heat exchange medium in the heat exchange tube 8 is output through the outlet water collection pipe 9.

[0036] Multiple heat exchange tubes 8 are arranged parallel and equidistantly in the same plane along the direction of airflow. Multiple rows of such tube banks are arranged sequentially along the direction of airflow and fixed together on tube sheets on both sides. The end of each row is connected in series with the beginning of the next row through connectors such as U-bends or manifolds. In this way, the heat exchange medium (cold water) enters from the inlet of the first row, flows through all the parallel pipes of the first row, turns 180 degrees through the U-bend to enter the second row, flows through all the pipes of the second row, and so on, flowing through all the tube banks in sequence, and finally flows out from the outlet of the last row, forming a continuous, reciprocating serpentine or S-shaped flow channel.

[0037] Example 4: Figure 1-3 As shown, the air supply unit is a DC brushless permanent magnet fan 3. The DC brushless permanent magnet fan 3 achieves stepless speed adjustment through an external fan control box. The DC brushless permanent magnet fan 3 is located between the heat exchange device 2 and the air outlet, and is used to drive air to flow in from the air inlet, be processed by the heat exchange device 2, and then flow out from the air outlet.

[0038] The air supply unit of this utility model is a DC brushless permanent magnet fan 3, and stepless speed regulation is achieved through an external stepless speed regulating fan control box 4.

[0039] A continuously variable speed control panel can also be connected to the continuously variable speed fan control box 4, so that the continuously variable speed control panel can communicate with the continuously variable speed fan control box 4. The user sets parameters through the continuously variable speed temperature control panel, the control panel issues commands, and the control box drives the fan to execute the specified wind speed after receiving the commands.

[0040] In addition, the continuously variable speed control panel can be connected to the external mixing valve of the fan coil unit to adjust the supply water temperature. As an intelligent control center, the temperature control panel precisely controls the operation of the external mixing valve via electrical signals, automatically adjusting the mixing ratio of cold water entering the fan coil unit and returning water, thereby achieving precise control of the supply water temperature.

[0041] In use, this invention employs a hydrophilic aluminum foil six-row tube pure counter-current heat exchange device 2 in conjunction with a DC brushless permanent magnet fan 3 with stepless airflow adjustment. The airflow is arbitrarily adjusted via a stepless speed-adjustable fan control box 4 and a stepless speed-adjustable control panel, and the water supply temperature is also controlled. This allows the heat-to-moisture ratio of the fan coil unit to be adjusted from 4000 to 10000 to adapt to different outdoor climates. During the rainy season, the low water temperature ensures that the surface temperature of the heat exchange device 2 is sufficiently low to condense more moisture. The low airflow prolongs the contact time between the air and the cold heat exchange device 2, allowing the air to be cooled closer to the surface temperature of the heat exchange device 2, thereby further squeezing out moisture. At this time, the total cooling capacity decreases, but the dehumidification capacity (latent heat cooling) ratio increases significantly, resulting in a lower actual operating heat-to-moisture ratio for the equipment, perfectly matching the low heat-to-moisture ratio load of a high-humidity environment. In summer, when regular cooling is required, the higher water temperature causes the surface temperature of the heat exchange device 2 to also rise, weakening the condensation and dehumidification effect. Large air volume shortens the air contact time, cooling the air but not deeply dehumidifying it. At this time, the proportion of sensible heat cooling increases, the proportion of latent heat cooling decreases, and the actual operating heat-to-moisture ratio of the equipment increases, matching the high heat-to-moisture ratio load of the conventional cooling season.

[0042] During the rainy season, when strong dehumidification is required but relatively weak cooling capacity is needed, with a heat-to-humidity ratio of 5000-6000, the chilled water supply temperature can be controlled at around 7℃. The airflow can be adjusted to be slightly lower than during the air-conditioning season to ensure the fan coil unit handles a heat-to-humidity ratio of 5000-6000, matching the demand. Therefore, no other equipment is needed to maintain a comfortable indoor temperature and humidity range. During the regular cooling season, when dehumidification requirements are less stringent, the supply water temperature can be increased to around 12℃, raising the fan coil unit's heat-to-humidity ratio to over 8000 for suitable temperature and humidity control outside the rainy season. This increased water supply significantly improves the air conditioning unit's energy efficiency ratio by over 10%, resulting in substantial savings in operating costs.

[0043] Example 5: Figure 1 As shown, a condensate pan is also provided inside the housing, and the condensate pan is located below the heat exchange device 2. The condensate pan is provided with a condensate outlet 7, which is located outside the housing 1.

[0044] The condensate pan is located below the heat exchange device 2, and all the condensate flowing down from the surface of the hydrophilic aluminum foil fins can be collected completely and effectively, preventing the condensate from dripping directly onto the fan, motor or other internal components of the equipment, thereby preventing equipment corrosion, electrical short circuits and water leakage from damaging the building decoration.

[0045] The condensate pan is a disc-shaped component that is mechanically fixed to the bottom of the inner cavity of the fan coil housing 1 and precisely located directly below the heat exchange device 2.

[0046] The bottom of the condensate pan has a certain slope to ensure that the collected condensate flows automatically to the lowest point. At the lowest point of the condensate pan, there is a mechanical connection for a condensate outlet 7. This condensate outlet 7 is a pipe fitting that penetrates the side wall of the housing 1, connecting the interior to the exterior. During installation, an external drain pipe is fitted or bonded to this condensate outlet 7 to guide the condensate to the building's pre-installed drainage system.

[0047] Example 6: As Figure 4 As shown, the heat exchange device 2 is provided with mounting plates 11 at both ends, and the mounting plates 11 are used to fix the heat exchange device 2 in the inner cavity of the housing 1.

[0048] Mounting plate 11 is a rigid plate fixed at both ends of heat exchange device 2, serving as an integrated mounting base for the entire heat exchange device 2.

[0049] The entire heat exchanger module 2 is mechanically fixed to the inner wall or internal frame of the shell 1 via mounting plates 11 at both ends. The fixing methods typically include screw tightening, riveting, or snap-fitting. This allows the heavy and complex multi-row serpentine heat exchange tube bundle 8 to be stably and precisely suspended or supported at predetermined positions within the shell 1.

Claims

1. A fan coil unit suitable for high-humidity areas along the Yangtze River, comprising a housing (1), characterized in that, The shell (1) is provided with a heat exchange device (2) in its inner cavity. The inner cavity of the shell (1) is connected to an air supply unit. The air supply unit inputs airflow into the shell (1) to exchange heat with the heat exchange device (2). The heat exchange device (2) includes a heat exchange tube (8), an inlet water distribution pipe (10), and an outlet water collection pipe (9). The heat exchange tube (8) is distributed in a serpentine shape in the shell (1). The outer surface of the heat exchange tube (8) is provided with hydrophilic aluminum foil fins. The hydrophilic aluminum foil fins are used to form a continuous water film of water in the airflow. In this process, the airflow inside the air supply unit input housing (1) comes into contact with the hydrophilic aluminum foil fins and forms a thermal bridge. The heat exchange device (2) has a counter-current structure. The inlet (5) of the water inlet distribution pipe (10) is located near the air outlet side of the fan coil unit. The outlet (6) of the water outlet collection pipe (9) is located near the air inlet side of the fan coil unit.

2. The fan coil unit according to claim 1, characterized in that, The heat exchange tubes (8) are arranged in multiple rows, and the multiple rows of heat exchange tubes (8) are arranged in parallel and connected sequentially to form a serpentine shape.

3. The fan coil unit according to claim 1, characterized in that, The outer wall of the shell (1) is provided with an inlet water distribution pipe (10) and an outlet water collection pipe (9). The two ends of the heat exchange tube (8) are respectively connected to the inlet water distribution pipe (10) and the outlet water collection pipe (9). The inlet water distribution pipe (10) is used to input the heat exchange medium into the heat exchange tube (8), and the heat exchange medium in the heat exchange tube (8) is output through the outlet water collection pipe (9).

4. The fan coil unit according to claim 1, characterized in that, The air supply unit is a DC brushless permanent magnet fan (3), and the DC brushless permanent magnet fan (3) can steplessly adjust the speed of the fan through an external fan control box.

5. The fan coil unit according to claim 4, characterized in that, The DC brushless permanent magnet fan (3) is located between the heat exchange device (2) and the air outlet, and is used to drive air to flow in from the air inlet, be processed by the heat exchange device (2), and then flow out from the air outlet.

6. The fan coil unit according to claim 1, characterized in that, The inner cavity of the shell is also provided with a condensate pan, which is located below the heat exchange device (2).

7. The fan coil unit according to claim 6, characterized in that, The condensate pan is provided with a condensate outlet (7), which is located outside the housing.

8. The fan coil unit according to claim 1, characterized in that, The heat exchange device (2) is provided with mounting plates (11) at both ends, and the mounting plates (11) are used to fix the heat exchange device (2) in the inner cavity of the shell (1).

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