Building inner area weak current well heat exchange cooling air conditioning system with centralized air conditioner

Abstract

The building inner area weak current well heat exchange cooling air conditioning system with the centralized air conditioner comprises a weak current well, a weak current cabinet is installed in the weak current well, and the top of the weak current well is a suspended ceiling inner space of the floor; the integrated air-conditioning water system further comprises a chilled water supply main pipeline, a chilled water return main pipeline and a condensate water drainage main pipeline of the integrated air-conditioning water system, a coil heat exchanger is arranged beside the weak current cabinet in the weak current well, and a shell-and-tube heat exchanger is arranged in the space in the suspended ceiling. The coil pipe type heat exchanger and the shell-and-tube heat exchanger conduct circulating heat exchange, and the shell-and-tube heat exchanger and the integrated air conditioner water system of the floor conduct circulating heat exchange. The shell-and-tube heat exchanger takes away heat in the weak current well through a building centralized air conditioner chilled water circulation system, and then heat exchange cooling and accurate temperature control in the weak current well are achieved.

Description

Technical Field

[0001] The present invention relates to the field of air-conditioning engineering, and in particular to an air-conditioning system suitable for heat exchange and cooling in the weak current well in the inner area of a building with a centralized air conditioner. Background Art

[0002] Due to the increasing degree of informatization at present, the equipment in the weak current well is gradually increasing, the functions are becoming more complex, the power consumption is also increasing, and the heat generated by the equipment is also increasing. Through actual measurement, the working temperature of the weak current equipment in a certain weak current well of a hospital building in summer is as high as 70 °C. The too high temperature not only affects the operation performance of the equipment, but also poses a great potential fire hazard. In particular, the event of a fire caused by overheating of the weak current well equipment in a certain hospital in summer in recent years is a wake-up call. However, due to the requirements of the building fire protection code, it is impossible to design air-conditioning ventilation and heat exchange pipes in the weak current well. For the weak current well in the inner area of the building, because it is far from the outside, it is not convenient to install a split air conditioner for cooling.

[0003] Therefore, the cooling of the weak current well has always been a major problem that troubles the design, construction and later operation of the building. Summary of the Invention

[0004] The purpose of the present invention is to provide an air-conditioning system that can utilize the cold quantity of the building centralized air-conditioning system to perform heat exchange and cooling on the weak current well in the inner area of the building.

[0005] The present invention is realized through the following technical scheme: a heat exchange and cooling air conditioning system for a weak current well in an inner area of ​​a building with centralized air conditioning, comprising a weak current well, a weak current cabinet installed in the weak current well, the outside of the weak current well being an inner corridor of the current floor, the top of the inner corridor being an inner space of the suspended ceiling of the current floor, and also comprising a chilled water supply main pipeline, a chilled water return main pipeline and a condensed water drainage main pipeline of an integrated air conditioning water system, characterized in that: a coil-type heat exchanger is arranged in the weak current well next to the weak current cabinet, and a shell-and-tube heat exchanger is arranged in the inner space of the suspended ceiling The coil inlet of the coil heat exchanger is connected to the heat transfer tube bundle outlet of the shell and tube heat exchanger through a first pipe, the coil outlet of the coil heat exchanger is connected to the heat transfer tube bundle inlet of the shell and tube heat exchanger through a second pipe, the shell inlet of the shell and tube heat exchanger is connected to the chilled water supply main pipeline through a third pipe, the shell outlet of the shell and tube heat exchanger is connected to the chilled water return main pipeline through a fourth pipe, and the coil heat exchanger and the shell and tube heat exchanger are connected to the condensed water drainage main pipeline through a drainage pipe. The coil of the coil heat exchanger, the first pipe, the heat transfer tube bundle of the shell and tube heat exchanger and the second pipe form a first heat exchange and cooling circulation system, that is, an internal circulation system that directly performs heat exchange and cooling on the weak current well. The chilled water supply main pipeline, the third pipeline, the shell of the shell and tube heat exchanger, the fourth pipeline and the chilled water return main pipeline form a second heat exchange and cooling circulation system. The second heat exchange and cooling circulation system acts on the first heat exchange and cooling circulation system, that is, an external circulation system that realizes heat exchange and cooling of the weak current well by performing heat exchange and cooling on the shell and tube heat exchanger.

[0006] In order to further stabilize and regulate the temperature in the weak current well, a first cooling fan and a temperature sensor are provided in the weak current cabinet, and a variable frequency circulation pump is provided on the first pipeline, and the variable frequency circulation pump is controlled in linkage with the temperature sensor.

[0007] In order to further adjust the system temperature, an electric proportional flow control valve is provided on the third pipeline, and the electric proportional flow control valve is controlled in linkage with the temperature sensor.

[0008] To further filter impurities in the pipeline system, a first Y-type filter is provided on the first pipeline after the variable frequency circulation pump, and a first drainage pipeline is provided after the first Y-type filter. Preferably, the first Y-type filter can be provided before the variable frequency circulation pump.

[0009] In order to further filter impurities in the chilled water of the centralized air-conditioning system, a second Y-type filter is arranged on the third pipeline after the electric proportional flow control valve, and a second drainage pipeline is arranged after the second Y-type filter.

[0010] To further regulate the system temperature, a pressure gauge and an automatic air vent valve are provided on the second pipeline, and a second cooling fan is also provided on the upper part of the coil heat exchanger.

[0011] To further facilitate operations such as disassembly, maintenance, cleaning, and replacement of the system, a coil heat exchanger outlet valve is provided on the second pipeline at the coil outlet end of the coil heat exchanger, and a coil heat exchanger inlet valve is provided on the first pipeline at the coil inlet section of the coil heat exchanger; a shell and tube heat exchanger tube side outlet valve is provided on the first pipeline at the outlet end of the heat exchange tube bundle of the shell and tube heat exchanger, and a shell and tube heat exchanger tube side inlet valve is provided on the second pipeline at the inlet end of the heat exchange tube bundle of the shell and tube heat exchanger; a shell and tube heat exchanger shell side inlet valve is provided on the third pipeline at the inlet end of the shell of the shell and tube heat exchanger, and a shell and tube heat exchanger shell side outlet valve is provided on the fourth pipeline at the outlet end of the shell of the shell and tube heat exchanger; a front end valve and a rear end valve are respectively provided on the first pipeline at the front and rear ends of the variable frequency circulating pump; a first drain valve is provided on the first drain pipeline, and a second drain valve is provided on the second drain pipeline.

[0012] To further improve the heat exchange efficiency, the third pipeline includes a rising branch pipeline connected to the main chilled water supply pipeline and a chilled water supply branch pipeline connected to the inlet of the shell of the shell and tube heat exchanger. The rising branch pipeline and the chilled water supply branch pipeline are connected. The height of the rising branch pipeline is more than 50 cm, and an automatic air vent valve should be provided at the highest point of the rising branch pipeline. The electric proportional flow regulating valve and the second Y-type filter are provided on the chilled water supply branch pipeline, and a chilled water supply branch pipeline gate valve is provided on the chilled water supply branch pipeline between the electric proportional flow regulating valve and the second Y-type filter.

[0013] To further protect the weak current cabinet, the coil heat exchanger is located above the weak current well cabinet. A water receiving tray is provided at the bottom of the coil heat exchanger. A water retaining plate extending upward is provided on one side of the water receiving tray facing the weak current well cabinet. A third drain pipeline is provided at the bottom of the water receiving tray. The third drain pipeline is connected to the main condensate drain pipeline of the next floor, and a one-way valve is provided on the third drain pipeline.

[0014] To further stabilize the system pressure when the system working medium temperature changes, a pressure type expansion tank is provided on the first pipeline or the second pipeline, and a water tank front end valve and a water tank rear end valve are respectively provided on the pipelines at the front and rear ends of the pressure type expansion tank.

[0015] To further ensure the safety of system operation, the variable frequency circulating pump is a centrifugal variable frequency circulating pump. Beneficial effects

[0016] 1. The air conditioning system of the present invention can solve the problem of heat exchange and cooling in the weak current shaft in the inner area of a building with a centralized air conditioner, and can effectively avoid the potential fire hazards caused by overheating of the weak current shaft in high-temperature summer weather.

[0017] 2. The air conditioning system of the present invention adopts the linkage control of a variable-frequency circulating pump and a temperature sensor beside the weak current cabinet. At the same time, the linkage control of an electric proportional flow regulating valve and the temperature sensor is also carried out, which can effectively realize the relatively accurate adjustment of the temperature in the area around the equipment in the weak current shaft, so as to ensure the efficient operation of the weak current equipment.

[0018] 3. The centrifugal variable-frequency circulating pump adopted by the air conditioning system of the present invention can realize that after the pump stops running or fails, the heat exchange working medium can still form a natural circulation in the pipeline system.

[0019] 4. The air conditioning system of the present invention does not have its own refrigeration source, but transfers the heat in the weak current shaft to the chilled water of the building's centralized air conditioner through the intermediate shell-and-tube heat exchanger and takes it away. This not only saves the cost of configuring an independent cold source for each weak current shaft, but also has good system temperature control performance. Description of the Drawings

[0020] Figure 1 It is the schematic diagram of the heat exchange and cooling air conditioning system for the weak current shaft in the inner area of the building with a centralized air conditioner in the embodiment.

[0021] Label description: branch bridge 1, coil heat exchanger outlet valve 2, baffle 3, coil 4, coil heat exchanger 5, main weak current bridge 6, water receiving tray 7, coil heat exchanger inlet valve 8, third drainage pipe 9, temperature sensor 10, weak current cabinet 11, first cooling fan 12, weak current shaft 13, weak current shaft access door 14, corridor 15, check valve 16, third drainage pipe opening 17, first drainage pipe 18, first drainage valve 19, first Y-type filter 20, rear-end valve 21, variable-frequency circulating pump 22, front-end valve 23, shell-and-tube heat exchanger tube-side outlet valve 24, second drainage pipe 25, second drainage valve 26, shell-and-tube heat exchanger shell-side inlet valve 27, second Y-type filter 28, chilled water supply branch pipe valve 29, third pipe 30, electric proportional flow regulating valve 31, room 32, condensate drainage main pipe 33, chilled water supply main pipe 34, chilled water supply rising branch pipe 35, chilled water return main pipe 36, ceiling internal space 37, fourth pipe 38, shell-and-tube heat exchanger 39, heat transfer tube bundle 40, baffle plate 41, shell-and-tube heat exchanger shell-side outlet valve 42, shell-and-tube heat exchanger tube-side inlet valve 43, automatic air vent valve 44, pressure gauge 45, first pipe 46, second cooling fan 47, second pipe 48. Detailed Embodiments

[0022] The following further describes in detail the specific embodiments of this patent in conjunction with the accompanying drawings. However, this patent is not limited to these embodiments. Any improvement or substitution based on the basic spirit of this embodiment still falls within the scope protected by the claims of this patent.

[0023] Embodiment: As Figure 1 shown, this embodiment provides a heat exchange and cooling air conditioning system for the weak current shaft in the inner area of a building with a central air conditioner, including a weak current shaft 13. A weak current cabinet 11 is arranged in the weak current shaft. A main weak current bridge 6 extending upward is arranged on the weak current cabinet, and a transverse branch bridge 1 is arranged at the top of the main weak current bridge. The outside of the weak current shaft is a building space, and the building space outside the weak current shaft is usually a corridor 15. The corridor is located between the weak current shaft and a room 32, and the ceiling structures of the corridor and the room are the ceiling structures of this floor. The internal space 37 of the ceiling is separated from the weak current shaft by a fireproof partition wall. A weak current shaft access door 14 is arranged at the position where the corridor faces the weak current shaft. The main weak current bridge is used to lay communication cables with weak current shafts on different floors, and the branch bridge leads to the ceiling of this floor and is used to lay communication weak current cables on this floor.

[0024] In the weak current cabinet in the weak current shaft of this embodiment, a first cooling fan 12 and a temperature sensor 10 are provided. Devices such as switches operating in the weak current cabinet are heat sources. The first cooling fan integrated in the weak current cabinet or an independently installed additional first cooling fan is used to enhance the air circulation in the weak current cabinet, thereby realizing convective heat exchange and cooling of the devices in the weak current cabinet. The temperature sensor is used to monitor the temperature in the weak current cabinet in real time so as to make adjustments through the air conditioning system of this embodiment at any time.

[0025] In each floor of the building in this embodiment, an integrated air-conditioning water system for that floor is provided. The integrated air-conditioning water system on each floor includes a chilled water supply main pipe 34, a chilled water return main pipe 36, and a condensate drain main pipe 33 for the air-conditioning on that floor. The weak-current well heat exchange and cooling air-conditioning system in the building area further includes a coil heat exchanger 5 located in the weak-current well and a shell-and-tube heat exchanger 39 located in the corridor and / or the ceiling of the room on the same floor. Among them, the coil heat exchanger includes an internal coil 4 and heat dissipation fins. The shell-and-tube heat exchanger includes a shell, a heat transfer tube bundle 40 and a baffle 41 located in the shell. The coil inlet of the coil heat exchanger is connected to the heat transfer tube bundle outlet of the shell-and-tube heat exchanger through a first pipe 46, the coil outlet of the coil heat exchanger is connected to the heat transfer tube bundle inlet of the shell-and-tube heat exchanger through a second pipe 48, the shell inlet of the shell-and-tube heat exchanger is connected to the chilled water supply main pipe on the same floor through a third pipe 30, and the shell outlet of the shell-and-tube heat exchanger is connected to the chilled water return main pipe on the same floor through a fourth pipe 38. In this way, the coil of the coil heat exchanger, the first pipe, the heat transfer tube bundle of the shell-and-tube heat exchanger, and the second pipe form a first heat exchange and cooling circulation system. There is a heat exchange working medium in the first heat exchange and cooling circulation system for heat dissipation circulation. The first heat exchange and cooling circulation system is an internal circulation system that can directly realize heat exchange and cooling of the weak-current well. The chilled water supply main pipe, the third pipe, the shell of the shell-and-tube heat exchanger, the fourth pipe, and the chilled water return main pipe form a second heat exchange and cooling circulation system. There is chilled water in the second heat exchange and cooling circulation system. The second heat exchange and cooling circulation system directly acts on the first heat exchange and cooling circulation system. The chilled water flowing through the shell of the shell-and-tube heat exchanger takes away the heat of the heat exchange working medium in the heat transfer tube bundle, so that the temperature of the heat exchange working medium is reduced and then recycled into the coil of the coil heat exchanger. That is, the second heat exchange and cooling circulation system is an external circulation system that realizes heat exchange and cooling of the weak-current well by heat exchange and cooling of the shell-and-tube heat exchanger.

[0026] Among them, a variable-frequency circulating pump 22 and a first Y-type filter 20 are provided on the first pipeline. The first Y-type filter is arranged behind the variable-frequency circulating pump, and preferably can also be arranged in front of the variable-frequency circulating pump. Moreover, the variable-frequency circulating pump is linked and controlled with the temperature sensor in the weak current cabinet. That is, when the temperature in the weak current cabinet is on the high side, the rotation speed of the variable-frequency circulating pump is increased to increase the circulating flow rate of the heat exchange working medium in the first heat exchange and cooling circulation system; on the contrary, when the temperature in the weak current cabinet is on the low side, the rotation speed of the variable-frequency circulating pump is decreased to reduce the circulating flow rate of the heat exchange working medium in the first heat exchange and cooling circulation system. In this way, the temperature in the weak current well can be kept in a relatively stable state. As a preferred method in this embodiment, the variable-frequency circulating pump is preferably a centrifugal variable-frequency circulating pump with good sound insulation effect, which can realize that the heat exchange working medium can still form a natural circulation in the pipeline system after the pump stops running or fails.

[0027] A pressure gauge 45 and an automatic air vent valve 44 are provided on the second pipeline. The automatic air vent valve is arranged behind the pressure gauge. The pressure gauge is used to monitor the operating pressure in the first heat exchange and cooling circulation system, and the automatic air vent valve is used to automatically discharge the air in the first heat exchange and cooling circulation system.

[0028] An electric proportional flow regulating valve 31 and a second Y-type filter 28 are provided on the third pipeline. The second Y-type filter is arranged behind the electric proportional flow regulating valve. Moreover, the electric proportional flow regulating valve is linked and controlled with the temperature sensor in the weak current cabinet. That is, when the temperature in the weak current cabinet is on the high side, the opening degree of the electric proportional flow regulating valve is increased to increase the circulating flow rate of the chilled water in the second heat exchange and cooling circulation system; on the contrary, when the temperature in the weak current cabinet is on the low side, the opening degree of the electric proportional flow regulating valve is decreased to reduce the circulating flow rate of the chilled water in the second heat exchange and cooling circulation system. In addition, in this embodiment, the third pipeline includes a chilled water supply rising branch pipeline 35 connected to the chilled water supply main pipeline and a chilled water supply branch pipeline connected to the shell inlet of the shell-and-tube heat exchanger. The chilled water supply rising branch pipeline and the chilled water supply branch pipeline are connected. The electric proportional flow regulating valve and the second Y-type filter are arranged on the chilled water supply branch pipeline. The height of the rising branch pipeline is more than 50 cm, so as to reduce the slag in the chilled water from entering the shell side of the shell-and-tube heat exchanger and causing fouling of the heat exchanger shell side, thereby affecting the heat exchange efficiency of the system, and can effectively reduce the cleaning and maintenance frequency of the shell-and-tube heat exchanger and the second Y-type filter. As another implementation method in this embodiment, if the height of the rising branch pipeline is too large, an automatic air vent valve can be arranged at the top of the rising branch pipeline to realize automatic air discharge when the air conditioner system is refilled with water in different seasons, so as to avoid air resistance in the pipeline and affect the normal operation of the shell-and-tube heat exchanger.

[0029] In addition, in this embodiment, a coil heat exchanger inlet valve 8 is provided on the first pipe at the inlet end of the coil of the coil heat exchanger. A first drain pipe 18 is provided between the coil heat exchanger inlet valve and the first Y-type filter, and a first drain valve 19 is provided on the first drain pipe. A front-end valve 23 is provided at the front end of the variable-frequency circulation pump on the first pipe, and a rear-end valve 21 is provided at the rear end of the variable-frequency circulation pump (the front end of the first Y-type filter). A shell-and-tube heat exchanger tube-side outlet valve 24 is provided on the first pipe at the outlet end of the heat transfer tube bundle of the shell-and-tube heat exchanger (behind the front-end valve). A coil heat exchanger outlet valve 2 is provided on the second pipe at the outlet end of the coil of the coil heat exchanger. A shell-and-tube heat exchanger tube-side inlet valve 43 is provided on the second pipe at the inlet end of the heat transfer tube bundle of the shell-and-tube heat exchanger. The pressure gauge and the automatic air vent valve are located between the coil heat exchanger outlet valve and the shell-and-tube heat exchanger tube-side inlet valve. A shell-and-tube heat exchanger shell-side inlet valve 27 is provided on the third pipe at the inlet end of the shell of the shell-and-tube heat exchanger, and a chilled water supply branch pipe valve 29 is provided on the chilled water supply branch pipe between the electric proportional flow regulating valve and the second Y-type filter. A second drain pipe 25 is provided on the third pipe between the inlet end of the shell of the shell-and-tube heat exchanger and the shell-and-tube heat exchanger shell-side inlet valve, and a second drain valve 26 is provided on the second drain pipe. A shell-and-tube heat exchanger shell-side outlet valve 42 is provided on the fourth pipe at the outlet end of the shell of the shell-and-tube heat exchanger.

[0030] Through the settings of the coil heat exchanger inlet valve and the outlet valve, operations such as disassembly, maintenance, cleaning, and replacement of the coil heat exchanger can be achieved. Through the settings of the tube-side inlet valve, tube-side outlet valve, shell-side inlet valve, and shell-side outlet valve of the shell-and-tube heat exchanger, operations such as disassembly, maintenance, cleaning, and replacement of the shell-and-tube heat exchanger can be achieved. Through the settings of the front-end valve and rear-end valve of the variable-frequency circulation pump, operations such as disassembly, maintenance, cleaning, and replacement of the variable-frequency circulation pump can be achieved. And at the same time, the valve settings in this embodiment can also achieve operations such as disassembly, maintenance, cleaning, and replacement of the first Y-type filter and the second Y-type filter.

[0031] As another implementation mode in this embodiment, the coiled tube heat exchanger can be arranged on the ground beside the weak electric cabinet or above the weak electric cabinet. In this embodiment, the coiled tube heat exchanger is arranged above the weak electric cabinet, and a second cooling fan 47 for blowing air to the coiled tube heat exchanger is arranged above or beside the coiled tube heat exchanger. A water receiving tray 7 is arranged at the bottom of the coiled tube heat exchanger. A water retaining plate 3 extending upward is arranged on one side of the water receiving tray facing the weak electric cabinet. A third drainage pipe 9 is arranged at the bottom of the water receiving tray. The third drain pipe orifice 17 of the third drainage pipe is connected to the condensate drainage main pipe of the next floor, and a one-way valve 16 is arranged on the third drainage pipe. The first drainage pipe is connected to the condensate drainage main pipe of the next floor. The second drainage pipe can be connected to the condensate drainage main pipe of this floor or the condensate drainage main pipe of the next floor. In this embodiment, the first drainage pipe is connected to the third drainage pipe, that is, connected to the condensate drainage main pipe of the next floor, and the second drainage pipe is connected to the condensate drainage main pipe of this floor.

[0032] As an implementation mode in this embodiment, a pressure expansion tank is arranged on the first pipe or the second pipe, and a water tank front valve and a water tank rear valve are respectively arranged on the pipes at the front end and the rear end of the pressure expansion tank. The heat transfer working medium is ammonia water.

[0033] As an implementation mode in this embodiment, the fire door is preferably adopted for the access door of the weak electric well, and the fireproof airtight door is recommended; fireproof plugging shall be done well for the main weak electric cable tray, branch cable trays and all pipe penetrations through the wall. All pipes and the like shall be insulated according to the specifications, and stainless steel materials are recommended for various pipes, valves and variable frequency circulation pumps in the air conditioning system to avoid the leakage of the heat transfer working medium of the air conditioning system in the weak electric well due to rust of iron / cast iron materials, resulting in damage to weak electric equipment.

[0034] It is recommended to place appropriate desiccants in the weak electric well. So that after the staff enter and exit the weak electric well, the desiccants can absorb the moisture in the newly entered air to minimize the condensate generated during the operation of the air conditioning system, and cooperate with the airtight door to avoid the free entry of air with a large water content into the weak electric well.

Claims

1. A heat exchange and cooling air conditioning system for a weak current well in an inner area of ​​a building with centralized air conditioning, comprising a weak current well, a weak current cabinet installed in the weak current well, an inner corridor of the current floor outside the weak current well, and a ceiling space of the current floor on the top of the inner corridor, and also comprising a chilled water supply main pipeline, a chilled water return main pipeline and a condensed water drainage main pipeline of an integrated air conditioning water system, characterized in that: A coil heat exchanger is arranged in the weak current well next to the weak current cabinet, and a shell and tube heat exchanger is arranged in the space in the suspended ceiling. The coil inlet of the coil heat exchanger is connected to the heat transfer tube bundle outlet of the shell and tube heat exchanger through a first pipe, the coil outlet of the coil heat exchanger is connected to the heat transfer tube bundle inlet of the shell and tube heat exchanger through a second pipe, the shell inlet of the shell and tube heat exchanger is connected to the chilled water supply main pipe through a third pipe, the shell outlet of the shell and tube heat exchanger is connected to the chilled water return main pipe through a fourth pipe, and the coil heat exchanger and the shell and tube heat exchanger are connected to the condensate drainage main pipe through a drainage pipe.

2. The building internal area weak current well heat exchange and cooling air conditioning system with centralized air conditioning as claimed in claim 1, characterized in that: A first cooling fan and a temperature sensor are arranged in the weak current cabinet, a variable frequency circulation pump is arranged on the first pipeline, and the variable frequency circulation pump is linked with the temperature sensor for control.

3. The building internal area weak current well heat exchange and cooling air conditioning system with centralized air conditioning as claimed in claim 2, characterized in that: The third pipeline is provided with an electric proportional flow regulating valve, and the electric proportional flow regulating valve is controlled in linkage with the temperature sensor.

4. The building internal area weak current well heat exchange and cooling air conditioning system with centralized air conditioning as claimed in claim 3, characterized in that: A first Y-type filter is arranged on the first pipeline after the variable frequency circulation pump, and a first drainage pipeline is arranged after the first Y-type filter.

5. The building internal area weak current well heat exchange and cooling air conditioning system with centralized air conditioning as claimed in claim 4, characterized in that: A second Y-type filter is arranged on the third pipeline after the electric proportional flow control valve, and a second drainage pipeline is arranged after the second Y-type filter.

6. The building interior weak current well heat exchange and cooling air conditioning system with centralized air conditioning as claimed in claim 5, characterized in that: A pressure gauge and an automatic drain valve are arranged on the second pipeline, and a second heat dissipation fan is also arranged on the upper part of the coil heat exchanger.

7. The building internal area weak current well heat exchange and cooling air conditioning system with centralized air conditioning as claimed in claim 6, characterized in that: A coil heat exchanger outlet valve is arranged on the second pipe at the coil outlet end of the coil heat exchanger, and a coil heat exchanger inlet valve is arranged on the first pipe of the coil inlet section of the coil heat exchanger; a shell and tube heat exchanger tube side outlet valve is arranged on the first pipe at the outlet end of the heat exchange tube bundle of the shell and tube heat exchanger, and a shell and tube heat exchanger tube side inlet valve is arranged on the second pipe at the inlet end of the heat exchange tube bundle of the shell and tube heat exchanger; a shell and tube heat exchanger shell side inlet valve is arranged on the third pipe at the shell inlet end of the shell of the shell and tube heat exchanger, and a shell and tube heat exchanger shell side outlet valve is arranged on the fourth pipe at the shell outlet end of the shell of the shell and tube heat exchanger; a front valve and a rear valve are respectively arranged on the first pipes at the front and rear ends of the variable frequency circulation pump; a first drain valve is arranged on the first drain pipe, and a second drain valve is arranged on the second drain pipe.

8. The building interior weak current well heat exchange and cooling air conditioning system with centralized air conditioning as claimed in claim 7, characterized in that: The third pipeline includes an ascending branch pipeline connected to the chilled water supply main pipeline and a chilled water supply branch pipeline connected to the shell inlet of the shell and tube heat exchanger, the ascending branch pipeline is connected to the chilled water supply branch pipeline, the height of the ascending branch pipeline is above 50 cm, the electric proportional flow regulating valve and the second Y-type filter are arranged on the chilled water supply branch pipeline, and a chilled water supply branch pipeline gate valve is arranged on the chilled water supply branch pipeline between the electric proportional flow regulating valve and the second Y-type filter.

9. The building internal area weak current well heat exchange and cooling air conditioning system with centralized air conditioning as claimed in claim 8, characterized in that: The coil-type heat exchanger is located above the weak-current well cabinet, and a water receiving pan is arranged at the bottom of the coil-type heat exchanger. A water baffle extending upward is arranged on the side of the water receiving pan facing the weak-current well cabinet, and a third drainage pipe is arranged at the bottom of the water receiving pan. The third drainage pipe is connected to the condensate drainage main pipe of the next floor, and a one-way valve is arranged on the third drainage pipe.

10. The building internal area weak current well heat exchange and cooling air conditioning system with centralized air conditioning as claimed in claim 9, characterized in that: A pressure expansion water tank is arranged on the first pipeline or the second pipeline, and a water tank front end valve and a water tank rear end valve are respectively arranged on the pipelines at the front end and the rear end of the pressure expansion water tank.

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