A water-storage unit-type central air conditioning system

Abstract

This utility model belongs to the field of HVAC technology, specifically relating to a water-storage unit-type central air conditioning system. It connects a circulating pump, an energy storage tank, a heating / cooling module, and user air conditioning terminals via pipelines, a winter / summer air conditioning switching valve group, and several operating condition switching valves. The heating / cooling module can directly supply heat / cooling to the user air conditioning terminals, or it can store cooling / heating energy in the energy storage tank and then supply heat / cooling to the user air conditioning terminals through the energy storage tank. The technical solution shown in this utility model eliminates the need for installing outdoor air conditioning units or other equipment outside the building; only corresponding devices need to be installed indoors, adapting to the building structure. Simultaneously, tenants can independently control their usage needs and actively select heating / cooling times through the energy storage tank's cold / heat storage function, indirectly reducing energy costs.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating, ventilation and air conditioning, and particularly relates to a water energy storage unit type central air conditioning system. Background Technique

[0002] At present, office building tenants generally face many problems in the use of air conditioners: on the one hand, most tenants are forced to use the centralized central air conditioners provided by the property. The billing methods are mostly based on the leased area or usage. Not only is the usage cost high, but tenants cannot independently adjust the operating status of the air conditioner according to their actual needs (such as the number of people, usage time period, temperature preference, etc.), and the flexibility is extremely poor; on the other hand, due to the characteristics of long pipelines and long transmission distances in the centralized air conditioning system, the energy efficiency is generally low. The energy consumption in the transmission and distribution links often accounts for more than 30%. And this part of the additional energy consumption is often passed on to the tenants in the form of fees, further increasing the burden on the tenants; in addition, if tenants choose to install traditional air conditioners separately to avoid the disadvantages of centralized air conditioners, it will damage the integrity and aesthetics of the building facade due to problems such as the installation of outdoor units. Moreover, traditional split air conditioners are difficult to adapt to the uniform cooling / heating requirements in large open office scenarios and cannot meet the actual use requirements of office buildings.

[0003] In response to the above problems, there are already some solutions in the prior art, but they all have obvious defects: Although split air conditioners can achieve a certain degree of分户调控, their energy efficiency level is low, and restricted by the building structure of office buildings, the installation location and quantity of outdoor units are often strictly restricted, making it difficult to be widely applied; Although the VRF multi-connected system has improved in分户控制, the initial investment cost is high, and due to the lack of energy storage function, it cannot effectively utilize the peak-valley electricity price difference to optimize the energy consumption cost, and the economy is poor; For the traditional property centralized air conditioning system, because its control logic is based on the overall building rather than the refined needs of individual tenants, it is difficult to accurately adjust according to the usage habits and energy-saving needs of different tenants, resulting in limited energy-saving effects.

[0004] To sum up, the existing office building air conditioning systems have deficiencies in terms of tenant autonomy, energy consumption cost, installation adaptability, and energy-saving refinement. There is an urgent need for an air conditioning solution that can take into account the tenant's independent control requirements, reduce energy consumption costs, and adapt to the building structure. Content of the Utility Model

[0005] Therefore, the utility model provides a water energy storage unit type central air conditioning system to solve the problems that the existing products cannot meet the tenant's independent control requirements, reduce energy consumption costs, and adapt to the building structure.

[0006] To achieve the above purposes, the utility model adopts the following technical solutions:

[0007] Provide a water energy storage unit type central air conditioning system, including:

[0008] The system includes a circulating pump, an energy storage tank, a heating and cooling module, and a user air conditioning terminal; the upper part of the energy storage tank is equipped with an upper water inlet and outlet pipe and an upper temperature sensor, and the lower part of the energy storage tank is equipped with a lower water inlet and outlet pipe and a lower temperature sensor; the energy storage tank stores a liquid medium.

[0009] The upper and lower water inlet and outlet ports of the energy storage tank are both connected to the winter / summer air conditioning switching valve group via pipelines.

[0010] The first pipeline of the winter / summer air conditioning switching valve group is connected to operating condition switching valve F1 and operating condition switching valve F2 respectively; the second pipeline of the winter / summer air conditioning switching valve group is connected to operating condition switching valve F3 and operating condition switching valve F4 respectively.

[0011] The other end of the operating condition switching valve F1 is connected to the water inlet of the user's air conditioning terminal pipe; the other end of the operating condition switching valve F2 is connected to the water inlet of the circulating pump; the other end of the operating condition switching valve F3 is connected to the water inlet of the circulating pump; the other end of the operating condition switching valve F4 is connected to one end of the operating condition switching valve F5, and the other end of the operating condition switching valve F5 is connected to the water inlet of the heating and cooling module.

[0012] The outlet of the circulating pump is connected to the inlet of the user's air conditioning terminal pipe; the outlet of the user's air conditioning terminal pipe is connected to the inlet of the heating and cooling module through the operating condition switching valve F5; the outlet of the heating and cooling module is connected to the inlet of the circulating pump.

[0013] Preferably, the winter / summer air conditioning switching valve assembly includes:

[0014] Winter-summer switching valve C1, winter-summer switching valve C2, winter-summer switching valve C3 and winter-summer switching valve C4;

[0015] The upper inlet and outlet water pipes of the energy storage tank are respectively connected to one end of the winter-summer switching valve C1 and the winter-summer switching valve C2; ​​the lower inlet and outlet water pipes of the energy storage tank are respectively connected to one end of the winter-summer switching valve C3 and the winter-summer switching valve C4.

[0016] The other end of the winter-summer switching valve C1 is connected to the other end of the winter-summer switching valve C4, and the connection point serves as the first pipeline, which is connected to the operating condition switching valve F1 and the operating condition switching valve F2 respectively.

[0017] The other end of the winter-summer switching valve C2 is connected to the other end of the winter-summer switching valve C3. The connection point serves as a second pipeline, which is connected to the operating condition switching valves F3 and F4 respectively.

[0018] Preferably, the water storage unit-type central air conditioning system further includes: a control panel;

[0019] Winter-summer switching valve C1, winter-summer switching valve C2, winter-summer switching valve C3, winter-summer switching valve C4, operating condition switching valve F1, operating condition switching valve F2, operating condition switching valve F3, operating condition switching valve F4 and operating condition switching valve F5 are all electronic switching valves.

[0020] The control terminal of each electronic switching valve is connected to the control panel.

[0021] Preferably, the water storage unit-type central air conditioning system further includes: an indoor temperature sensor installed in the indoor air-conditioned room;

[0022] The indoor temperature sensor is connected to the control panel, and the control panel is also connected to the circulating pump.

[0023] Preferably, the control panel is also connected to the control terminal of the heating and cooling module;

[0024] The control panel is also connected to the upper temperature sensor and the lower temperature sensor respectively.

[0025] Preferably, in the water storage unit type central air conditioning system, both the upper and lower water inlet and outlet pipes adopt a uniform water inlet and outlet pipe array.

[0026] Preferably, the energy storage tank further includes a water supply pipe and a water drain pipe.

[0027] Preferably, the heating and cooling module is an air source heat pump or a ground source heat pump.

[0028] The present invention, by adopting the above technical solution, has at least the following beneficial effects:

[0029] It is understood that the technical solution shown in this utility model connects the circulating pump, energy storage tank, heating / cooling module, and user air conditioning terminal via pipelines, a winter / summer air conditioning switching valve group, and several operating condition switching valves. The heating / cooling module can directly supply heat / cooling to the user air conditioning terminal, or the heating / cooling module can store cold / heat energy in the energy storage tank and then supply heat / cooling to the user air conditioning terminal through the energy storage tank. The technical solution shown in this utility model eliminates the need to install air conditioning outdoor units or other equipment outside the building; only corresponding devices need to be installed indoors, adapted to the building structure. Simultaneously, tenants can independently control their usage needs and actively select heating / cooling time through the energy storage tank's cold / heat storage function, indirectly reducing energy costs.

[0030] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a water-storage unit-type central air conditioning system according to an exemplary embodiment of this utility model;

[0033] Figure 2 This is a schematic diagram illustrating the installation of a device in a room corner, as shown in an exemplary embodiment of this utility model;

[0034] Figure 3 This is a schematic diagram illustrating the installation of an outdoor platform device according to an exemplary embodiment of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] Figure 1 This is a schematic diagram of a water-storage unit-type central air conditioning system according to an exemplary embodiment of this utility model. See also: Figure 1 A water-storage unit-type central air conditioning system is provided, comprising:

[0037] The system comprises a circulating pump 1, an energy storage tank 2, a heating / cooling module 3, and a user air conditioning terminal 4. The energy storage tank 2 has an upper water inlet / outlet pipe 9 and an upper temperature sensor 7 at its upper part, and a lower water inlet / outlet pipe 10 and a lower temperature sensor 8 at its lower part. The energy storage tank 2 stores a liquid medium. Preferably, the liquid medium is water, employing water-based energy storage, or a phase change material is added to the water to form a liquid solution medium. The following explanation uses water-based energy storage as an example.

[0038] The upper inlet / outlet 9 and lower inlet / outlet 10 of the energy storage tank 2 are both connected to the winter / summer air conditioning switching valve group through pipelines.

[0039] The first pipeline of the winter / summer air conditioning switching valve group is connected to operating condition switching valve F1 and operating condition switching valve F2 respectively; the second pipeline of the winter / summer air conditioning switching valve group is connected to operating condition switching valve F3 and operating condition switching valve F4 respectively.

[0040] The other end of the operating condition switching valve F1 is connected to the water inlet of the user's air conditioning terminal 4 pipe; the other end of the operating condition switching valve F2 is connected to the water inlet of the circulating pump 1; the other end of the operating condition switching valve F3 is connected to the water inlet of the circulating pump 1; the other end of the operating condition switching valve F4 is connected to one end of the operating condition switching valve F5, and the other end of the operating condition switching valve F5 is connected to the water inlet of the heating and cooling module 3.

[0041] The outlet of the circulating pump 1 is connected to the inlet of the user's air conditioner terminal 4 pipe; the outlet of the user's air conditioner terminal 4 pipe is connected to the inlet of the heating and cooling module 3 through the operating condition switching valve F5; the outlet of the heating and cooling module 3 is connected to the inlet of the circulating pump 1.

[0042] In practice, when applying the air conditioning system provided by this technical solution, the corresponding equipment must first be installed. Taking an office building as an example, the installation location of the equipment is first selected in the tenant unit, such as a corner room with an exterior window, a storage room, or an outdoor platform. (See [link to relevant documentation]). Figure 2 and Figure 3 .

[0043] At a selected corner or outdoor platform, install the main unit (such as a 50kW modular unit) of the heating and cooling module 3 and the circulation pump 1 on top of the energy storage tank 2 and the water tank; then install the piping and multiple switching valves. If there are existing air conditioning pipes in the property, install isolation valves at the connection points of the existing air conditioning pipes to physically disconnect them.

[0044] See Figure 2 and Figure 3 The air conditioning system shown in the embodiment only needs to be installed in a corner of the room or on an outdoor platform, without the need to modify the external wall.

[0045] In practical use, the energy storage tank 2 is switched between heat storage and cold storage via the winter / summer air conditioning switching valve group. During heating, the upper inlet / outlet pipe 9 of the energy storage tank 2 serves as the outlet, ensuring that the water supplied to the user is always the high-temperature water from the upper layer of the tank, while the lower inlet / outlet pipe 10 serves as the inlet. During cooling, the lower inlet / outlet pipe 10 of the energy storage tank 2 serves as the outlet, ensuring that the water supplied to the user is always the low-temperature water from the lower layer of the tank, while the upper inlet / outlet pipe 9 serves as the inlet.

[0046] In one embodiment, the winter / summer air conditioning switching valve assembly includes:

[0047] Winter-summer switching valve C1, winter-summer switching valve C2, winter-summer switching valve C3 and winter-summer switching valve C4;

[0048] The upper inlet and outlet water pipes 9 of the energy storage tank 2 are respectively connected to one end of the winter-summer switching valve C1 and the winter-summer switching valve C2; ​​the lower inlet and outlet water pipes 10 of the energy storage tank 2 are respectively connected to one end of the winter-summer switching valve C3 and the winter-summer switching valve C4.

[0049] The other end of the winter-summer switching valve C1 is connected to the other end of the winter-summer switching valve C4, and the connection point serves as the first pipeline, which is connected to the operating condition switching valve F1 and the operating condition switching valve F2 respectively.

[0050] The other end of the winter-summer switching valve C2 is connected to the other end of the winter-summer switching valve C3. The connection point serves as a second pipeline, which is connected to the operating condition switching valves F3 and F4 respectively.

[0051] In this embodiment, when the air conditioning system is operating in winter heating mode: winter-summer switching valves C1 and C3 are open, and winter-summer switching valves C2 and C4 are closed, ensuring that the water supplied to users is always the high-temperature water from the upper layer of the water tank; when the air conditioning system is operating in summer cooling mode: winter-summer switching valves C2 and C4 are open, and winter-summer switching valves C1 and C3 are closed, ensuring that the water supplied to users is always the low-temperature water from the lower layer of the water tank.

[0052] Meanwhile, due to the volatility of electricity prices, there will be off-peak and peak electricity. Users can choose three operating modes: simultaneous storage and supply, direct energy storage supply, and direct heat pump supply. These modes can be switched through the operating condition switching valves F1 to F5.

[0053] For example, during the initial or final stages of winter heating and summer air conditioning, when user load is relatively low, a simultaneous storage and supply operation mode can be adopted during off-peak hours. By manually controlling the operation mode switching valves F1, F3, and F5 to open and the operation mode switching valves F2 and F4 to close, the hot / cold water from the heating / cooling module 3 can be sent to the user for heating / cooling and to the energy storage tank 2 for heat / cold storage.

[0054] In this operating mode, during winter, the hot water from the heating / cooling module 3 is delivered directly to the user via the circulation pump 1, and flows into the lower part of the energy storage tank 2 via the operating condition switching valve F3 and the winter / summer switching valve C3. Water returning from the user flows back into the heating / cooling module 3 via the operating condition switching valve F5. The user can monitor the temperature in the tank using the lower temperature sensor 8. If the temperature reaches the set hot water temperature, the simultaneous storage and supply mode can be stopped.

[0055] In summer, the chilled water from the heating / cooling module 3 is delivered directly to the user via the circulation pump 1, and flows into the upper part of the energy storage tank 2 via the operating condition switching valve F3 and the winter / summer switching valve C2. The water returning from the user flows back into the heating / cooling module 3 via the operating condition switching valve F5. The user can monitor the temperature in the water tank through the upper temperature sensor 7. If the temperature reaches the set chilled water temperature, the simultaneous storage and supply mode stops.

[0056] Taking summer as an example, electricity is available from 23:00 to 7:00 during off-peak hours, priced at ¥0.3 / kWh. The heating and cooling module 3 can stop the simultaneous storage and supply mode when the temperature displayed by the upper temperature sensor 7 reaches 4℃ at full load.

[0057] After the simultaneous storage and supply mode is stopped, the simultaneous storage and supply mode can be stopped and switched to the direct energy storage supply mode.

[0058] In the direct energy storage operation mode, the operating condition switching valves F2 and F4 are open, and the operating condition switching valves F1, F3 and F5 are closed. In this mode, only the circulating pump 1 is running, and the heating and cooling module 3 is in a stopped state, resulting in the minimum system power consumption.

[0059] In winter, the upper inlet / outlet pipe 9 of the energy storage tank 2 serves as the outlet. Hot water flows out from the top, passes through the winter / summer switching valve C1, the operating condition switching valve F2, and the circulation pump 1, and flows into the user end to provide heat. Water returning from the user end flows back into the energy storage tank 2 through the operating condition switching valve F4 and the winter / summer switching valve C3.

[0060] When the temperature sensor 7 at the top of the water tank drops to the set temperature, it indicates that the heat supply effect has deteriorated, and it is necessary to stop the direct energy storage mode and switch to the simultaneous energy storage and supply mode.

[0061] In summer, the lower inlet / outlet pipe 10 of the energy storage tank 2 serves as the outlet. Cold water flows out from the bottom, passes through the winter / summer switching valve C4, the operating condition switching valve F2, and the circulation pump 1, and flows into the user end to provide heat to the user. Water returning from the user end flows back into the energy storage tank 2 through the operating condition switching valve F4 and the winter / summer switching valve C2.

[0062] When the temperature sensor 8 at the bottom of the water tank rises to the set temperature, it indicates that the cooling supply effect has deteriorated, and it is necessary to stop the direct energy storage mode and switch to the simultaneous energy storage and supply mode.

[0063] Taking summer as an example, the peak electricity hours are from 10:00 to 12:00, with a price of ¥1.2 / kWh. The cooling load is met by the energy storage tank 2, and the heating and cooling modules 3 supplement the load during other periods.

[0064] During the middle of winter heating and summer cooling seasons, when both heating and cooling loads are high, energy storage and supply can be combined during off-peak hours, while direct energy storage supply can be used during peak hours. At other times, heating and cooling module 3 uses direct supply to supplement insufficient heating / cooling.

[0065] In the direct heat pump supply mode, operating condition switching valves F1, F2, F3, and F4 are closed, and operating condition switching valve F5 is open. At this time, the hot / cold water from the heating / cooling module 3 flows directly into the user end through the circulation pump 1, while the water returning from the user end flows back to the heating / cooling module 3 through operating condition switching valve F5.

[0066] It is understood that the technical solution shown in this utility model connects the circulating pump 1, energy storage tank 2, heating / cooling module 3, and user air conditioning terminal 4 through pipelines, a winter / summer air conditioning switching valve group, and several operating condition switching valves. The heating / cooling module 3 can directly supply heat / cooling to the user air conditioning terminal 4, or the heating / cooling module 3 can store cold / heat energy in the energy storage tank 2 and then supply heat / cooling to the user air conditioning terminal 4 through the energy storage tank 2. The technical solution shown in this utility model eliminates the need to install air conditioning outdoor units or other equipment outside the building; only corresponding devices need to be installed indoors, adapting to the building structure. At the same time, tenants can independently adjust their usage needs and actively select heating / cooling time through the cold / heat storage function of the energy storage tank 2, indirectly reducing energy costs.

[0067] This embodiment is a unit-autonomous system that provides independent tenant units with a cooling and heating source solution that can be independent of the building's central air conditioning system through modular energy storage. A single system can cover tenant units of ≤2000㎡ (single-story / multi-story), and the main unit power and energy storage capacity are modularly configured according to the tenant area. At the same time, the equipment room only requires 6-10㎡ of building space.

[0068] In another embodiment, the water storage unit-type central air conditioning system based on the heating and cooling module 3 and water storage further includes: a control panel 5; winter-summer switching valves C1, C2, C3, C4, operating condition switching valves F1, F2, F3, F4, and F5 are all electronic switching valves; the control terminal of each electronic switching valve is connected to the control panel 5.

[0069] It is understood that the technical solution shown in this embodiment adds a control panel 5, which allows users to directly switch the on / off state of the switching valve through the control panel 5, thereby making it easier to switch between winter and summer operation modes.

[0070] In another embodiment, the water storage unit central air conditioning system based on the heating and cooling module 3 and water storage further includes: an indoor temperature sensor 6 installed in the indoor air-conditioned room; the indoor temperature sensor 6 is connected to the control panel 5, and the control panel 5 is also connected to the circulating pump 1.

[0071] The technical solution shown in this embodiment allows the control panel 5 to acquire temperature data through the indoor temperature sensor 6. Users can control the frequency conversion of the circulating pump 1 based on the temperature data to control the room temperature in real time. For example, it can operate at low temperature and prevent freezing at night in winter, providing precise energy supply, minimizing energy waste, reducing energy output, and storing excess heat energy in the water tank for release as needed.

[0072] In another embodiment, the control panel 5 is also connected to the control terminal of the heating and cooling module 3; the control panel 5 is also connected to the upper temperature sensor 7 and the lower temperature sensor 8 respectively.

[0073] The technical solution shown in this embodiment also allows the control panel 5 to control the heating and cooling module 3 to turn on or off, and to display the temperature data collected by the upper temperature sensor 7 and the lower temperature sensor 8 on the control panel 5, which is convenient for user operation.

[0074] In another embodiment, the water storage unit central air conditioning system based on the heating and cooling module 3 and water storage energy storage, wherein the upper water inlet / outlet 9 and the lower water inlet / outlet 10 both adopt uniform water inlet / outlet pipe arrays.

[0075] See Figure 1 In this embodiment, an inlet and outlet water pipe array is used, which can make the water flow more uniform.

[0076] In another embodiment, the energy storage tank 2 further includes a water supply pipe 11 and a water drain pipe 12.

[0077] In another embodiment, the heating and cooling module 3 is an air source heat pump or a ground source heat pump.

[0078] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

[0079] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A water-storage unit-type central air conditioning system, characterized in that, include: The system includes a circulating pump, an energy storage tank, a heating and cooling module, and a user air conditioning terminal; the upper part of the energy storage tank is equipped with an upper water inlet and outlet pipe and an upper temperature sensor, and the lower part of the energy storage tank is equipped with a lower water inlet and outlet pipe and a lower temperature sensor; the energy storage tank stores a liquid medium. The upper and lower water inlet and outlet ports of the energy storage tank are both connected to the winter / summer air conditioning switching valve group via pipelines. The first pipeline of the winter / summer air conditioning switching valve group is connected to operating condition switching valve F1 and operating condition switching valve F2 respectively; the second pipeline of the winter / summer air conditioning switching valve group is connected to operating condition switching valve F3 and operating condition switching valve F4 respectively. The other end of the operating condition switching valve F1 is connected to the water inlet of the user's air conditioning terminal pipe. The other end of the operating condition switching valve F2 is connected to the inlet of the circulating pump; The other end of the operating condition switching valve F3 is connected to the inlet of the circulating pump; The other end of the operating condition switching valve F4 is connected to one end of the operating condition switching valve F5, and the other end of the operating condition switching valve F5 is connected to the water inlet of the heating and cooling module. The outlet of the circulating pump is connected to the inlet of the user's air conditioning terminal pipe; the outlet of the user's air conditioning terminal pipe is connected to the inlet of the heating and cooling module through the operating condition switching valve F5; the outlet of the heating and cooling module is connected to the inlet of the circulating pump.

2. The water-storage unit-type central air conditioning system according to claim 1, characterized in that, The winter / summer air conditioning switching valve assembly includes: Winter-summer switching valve C1, winter-summer switching valve C2, winter-summer switching valve C3 and winter-summer switching valve C4; The upper inlet and outlet water pipes of the energy storage tank are respectively connected to one end of the winter-summer switching valve C1 and the winter-summer switching valve C2; ​​the lower inlet and outlet water pipes of the energy storage tank are respectively connected to one end of the winter-summer switching valve C3 and the winter-summer switching valve C4. The other end of the winter-summer switching valve C1 is connected to the other end of the winter-summer switching valve C4, and the connection point serves as the first pipeline, which is connected to the operating condition switching valve F1 and the operating condition switching valve F2 respectively. The other end of the winter-summer switching valve C2 is connected to the other end of the winter-summer switching valve C3. The connection point serves as a second pipeline, which is connected to the operating condition switching valves F3 and F4 respectively.

3. The water-storage unit-type central air conditioning system according to claim 2, characterized in that, Also includes: control Panel; Winter-summer switching valve C1, winter-summer switching valve C2, winter-summer switching valve C3, winter-summer switching valve C4, operating condition switching valve F1, operating condition switching valve F2, operating condition switching valve F3, operating condition switching valve F4 and operating condition switching valve F5 are all electronic switching valves. The control terminal of each electronic switching valve is connected to the control panel.

4. The water-storage unit-type central air conditioning system according to claim 3, characterized in that, Also includes: An indoor temperature sensor installed in an air-conditioned room; The indoor temperature sensor is connected to the control panel, and the control panel is also connected to the circulating pump.

5. The water-storage unit-type central air conditioning system according to claim 4, characterized in that, The control panel is also connected to the control terminal of the heating and cooling module; The control panel is also connected to the upper temperature sensor and the lower temperature sensor respectively.

6. The water-storage unit-type central air conditioning system according to any one of claims 1 to 5, characterized in that, Both the upper and lower inlet and outlet water pipes adopt a uniform inlet and outlet water pipe array.

7. The water-storage unit-type central air conditioning system according to any one of claims 1 to 5, characterized in that, The energy storage tank also includes a water supply pipe and a water drain pipe.

8. The water-storage unit-type central air conditioning system according to any one of claims 1 to 5, characterized in that, The heating and cooling module is an air source heat pump or a ground source heat pump.

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