Air conditioning system based on air source heat pump and water source heat pump

Abstract

The utility model discloses an air conditioning system based on an air source heat pump and a water source heat pump, and relates to the technical field of energy-saving transformation of building air conditioning systems. Comprising a user side, a water source heat pump unit, an air source heat pump unit, an energy storage conversion water tank, a plurality of electric valves and a plurality of circulating water pumps, and by combining the air source heat pump technology and the water source heat pump technology, dependence on non-renewable energy sources is reduced, and energy consumption and carbon emission are reduced; according to the air conditioning system, efficient cold and heat preparation modes can be flexibly selected under different environment conditions, and the overall energy efficiency is improved; the system is simple in structure and flexible in design, the number and configuration of equipment can be adjusted according to actual requirements, and compared with a traditional system, equipment layout and pipeline design are optimized, equipment occupied space is reduced, and the influence on a building structure is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy-saving reconstruction of building air conditioning systems, and particularly relates to an air conditioning system based on an air source heat pump and a water source heat pump. BACKGROUND

[0002] In existing large building air conditioning systems, lithium bromide absorption direct-fired units are widely used as traditional cold and heat source equipment, but their technical defects are increasingly prominent under the energy transformation and cost pressure. First, such systems highly depend on non-renewable energy sources such as natural gas, and when the demand for heating increases in winter, they not only face the cost pressure of natural gas price fluctuations, but also have significantly reduced operating efficiency due to the limitation of gas sources during the peak period. In addition, the heating performance of lithium bromide units in low-temperature environments is poor, and the energy conversion efficiency is low, further increasing the overall operating cost.

[0003] On the other hand, although air source heat pump technology has energy-saving potential, its application in existing buildings is limited by multiple constraints. The heating efficiency of traditional air source heat pumps decreases sharply under extreme low-temperature conditions, making it difficult to meet the heating needs of buildings in severe cold regions. At the same time, due to structural design or space limitations, it is difficult to add large-scale heat pump units and auxiliary equipment in existing buildings, and the dense arrangement may cause problems such as increased structural load and occupied public space, making it difficult to implement the reconstruction scheme. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide an air conditioning system based on an air source heat pump and a water source heat pump, which realizes flexible switching of cold and heat sources in the limited space of existing buildings by integrating efficient heat pump technology, waste heat recovery systems, and modular equipment design, reduces dependence on non-renewable energy sources, and simultaneously improves energy utilization efficiency and economy.

[0005] To achieve the above purpose, the embodiments of the present application provide an air conditioning system based on an air source heat pump and a water source heat pump, comprising:

[0006] A user end is located at the top of the air conditioning system, representing the service object of the air conditioning system; a first electric valve is connected to one side of the user end through a first circulating water pump, and a fourth electric valve is directly connected to the other side; a pressure balance valve is also connected to the side near the user end between the first electric valve and the fourth electric valve, for maintaining the pressure stability of the air conditioning system;

[0007] A water source heat pump unit is connected to the other side between the first electric valve and the fourth electric valve, serving as a cold and heat preparation device on the secondary side; the water source heat pump unit is composed of an evaporator and a condenser; the first electric valve and the fourth electric valve are connected to the evaporator; the evaporator and the condenser are directly connected and connected to a sixth electric valve and a seventh electric valve through the condenser, respectively; the sixth electric valve is on the same side as the first electric valve, and the seventh electric valve is on the same side as the fourth electric valve;

[0008] The second electric valve is connected between one side of the first electric valve and one side of the sixth electric valve; and the fifth electric valve is connected between one side of the first electric valve and the other side of the sixth electric valve;

[0009] The third electric valve is connected between one side of the fourth electric valve and one side of the seventh electric valve; and the eighth electric valve is connected between one side of the fourth electric valve and the other side of the seventh electric valve;

[0010] The sixth electric valve and the seventh electric valve are connected to the energy storage conversion water tank, wherein the second circulating water pump is further connected between the sixth electric valve and the energy storage conversion water tank; and the air source heat pump unit is further connected to the energy storage conversion water tank as a cold and heat preparation device on the primary side, wherein the third circulating water pump is further connected between the energy storage conversion water tank on the same side as the second circulating water pump and the air source heat pump unit.

[0011] According to the method provided in the embodiments of the present application, the following additional technical features can also be present:

[0012] Further, the air source heat pump unit has a dual-function of refrigeration and heating.

[0013] Further, the water source heat pump unit has a dual-function of refrigeration and heating and the water outlet temperature in the heating mode is greater than or equal to 60℃.

[0014] Further, the first circulating water pump, the second circulating water pump and the third circulating water pump are cold-temperature water single-stage centrifugal pumps with a fluid temperature resistance of 80℃.

[0015] Compared with the prior art, the air conditioning system based on the air source heat pump and the water source heat pump provided in the embodiments of the present application has the following beneficial technical effects:

[0016] By combining the air source heat pump and the water source heat pump technology, the embodiments of the present application reduce the dependence on non-renewable energy sources such as natural gas, which helps to promote energy transformation and sustainable development; the water source heat pump unit uses renewable energy sources (such as underground water and surface water) as heat sources or cold sources, further reducing energy consumption and carbon emissions.

[0017] The combination of the air source heat pump unit and the water source heat pump unit enables the system to flexibly select the most efficient cold and heat preparation method under different environmental conditions, improving the overall energy efficiency; the setting of the energy storage conversion water tank enables the system host to run smoothly in the high-efficiency range, avoiding frequent start-stop, further reducing energy consumption and operating costs; compared with the lithium bromide absorption direct-fired unit, the embodiments of the present application can still maintain high heating efficiency in low-temperature environments, reducing energy conversion losses.

[0018] The embodiment of the application is flexible, and the number and configuration of the air source heat pump unit and the water source heat pump unit can be adjusted according to actual needs to adapt to buildings of different scales and needs; the cross-connection design of the electric valve enables the system to have multiple operation modes, and the optimal operation strategy can be selected according to actual conditions, thereby improving the adaptability and flexibility of the system.

[0019] Compared with a traditional air source heat pump system, the embodiment of the application reduces the equipment occupation space and the influence on the existing building structure by optimizing the equipment layout and pipeline design; the reasonable arrangement of the energy storage conversion water tank and the circulating water pump and other equipment avoids the problems of increased structural load and public space occupation caused by the dense arrangement of heat pump units. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure block diagram of the air conditioning system based on the air source heat pump and the water source heat pump is shown.

[0021] Marked as follows: 1, first electric valve; 2, second electric valve; 3, third electric valve; 4, fourth electric valve; 5, fifth electric valve; 6, sixth electric valve; 7, seventh electric valve; 8, eighth electric valve; 9, user end; 10, first circulating water pump; 11, pressure balance valve; 12, evaporator; 13, condenser; 14, second circulating water pump; 15, energy storage conversion water tank; 16, third circulating water pump; 17, air source heat pump unit; 18, water source heat pump unit. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below with reference to the drawings. It can be understood that the specific embodiments described herein are only used to explain the application, but not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings, not all the structures. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0023] The terms "include" and "have" and any variations thereof in the application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally includes other steps or units not listed or optionally includes other steps or units inherent to the process, method, product or device.

[0024] Reference to“an embodiment” or“the embodiment” in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” or“in at least one embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. It is expressly understood that any of the embodiments described can be incorporated separately or in various combinations or sub-combinations with each other without departing from the scope of the application.

[0025] As shown in Figure 1 The embodiment of the present application provides an air conditioning system based on air source heat pump and water source heat pump, comprising:

[0026] The user end 9 is located at the top of the air conditioning system and is the service object of the entire air conditioning system. It represents a space or area that needs to adjust temperature or humidity, such as the indoor environment of a building. The user end 9 is connected to the first circulating water pump 10 and the first electric valve 1 to ensure that water can circulate and flow to the user end for heat exchange. The other side is directly connected to the fourth electric valve 4, which allows the air conditioning system to flexibly adjust the water flow path in different operating modes.

[0027] A pressure balance valve 11 is connected between the first electric valve 1 and the fourth electric valve 4 near the user end. The valve is used to maintain the stable pressure of the air conditioning system to prevent air conditioning system failure or performance decline caused by pressure fluctuations. It ensures that the air conditioning system can maintain a stable operating state under different loads and working conditions.

[0028] The water source heat pump unit 18 as the cold and heat preparation equipment of the secondary side is composed of an evaporator 12 and a condenser 13, has the dual function of refrigeration and heating, and the water outlet temperature is ≥60℃ in the heating mode. It extracts or releases heat from the water source through water as a medium to meet the cold and heat demand of the user end. The first electric valve 1 and the fourth electric valve 4 are connected to the evaporator 12, the evaporator 12 and the condenser 13 are directly connected to form a complete heat exchange circuit. The condenser 13 is connected to the sixth electric valve 6 and the seventh electric valve 7, which allows the air conditioning system to flexibly adjust the water flow path and flow in different operating modes.

[0029] There are eight electric valves in the air conditioning system, including the first electric valve 1 to the eighth electric valve 8, which control the water flow direction and flow rate according to the operation requirements of the air conditioning system. By opening or closing different electric valves, the air conditioning system can realize multiple operation modes, such as refrigeration, heating, energy storage, etc. Specifically, in the refrigeration mode, the first electric valve 1, the fourth electric valve 4, the sixth electric valve 6 and the seventh electric valve 7 are opened, and the second electric valve 2, the third electric valve 3, the fifth electric valve 5 and the eighth electric valve 8 are closed; in the heating mode, the first electric valve 1, the fourth electric valve 4, the sixth electric valve 6 and the seventh electric valve 7 are closed, and the second electric valve 2, the third electric valve 3, the fifth electric valve 5 and the eighth electric valve 8 are opened.

[0030] There are three circulating water pumps in the air conditioning system, including the first circulating water pump 10, the second circulating water pump 14 and the third circulating water pump 16, which are single-stage centrifugal pumps for cold water with a temperature of 80℃. They drive the water to circulate in the air conditioning system. The first circulating water pump 10 is responsible for transporting water from the user end to the water source heat pump unit 18 for heat exchange; the second circulating water pump 14 and the third circulating water pump 16 are responsible for circulating water between the energy storage conversion water tank 15 and the air source heat pump unit 17, ensuring that the cold and heat sources can be evenly distributed to the areas that need to be cooled or heated.

[0031] The air source heat pump unit 17 is a cold and heat preparation device on the primary side, with dual-function of refrigeration and heating. The air source heat pump unit 17 uses the heat or cold energy in the air to produce heat or cold, and transfers the heat or cold to the water, providing cold and heat sources for the air conditioning system.

[0032] The function of the energy storage conversion water tank 15 in the air conditioning system is to store and regulate cold and heat sources. When the air conditioning system needs to refrigerate or heat, the water tank can release or absorb heat, so that the main machine of the air conditioning system runs smoothly in the high efficiency range. At the same time, the water tank can also play a buffering role, avoiding frequent start and stop of the air conditioning system, thereby prolonging the service life of the equipment and improving the reliability of the air conditioning system.

[0033] In the refrigeration mode, the air source heat pump unit 17 absorbs heat from the air and releases the heat to the water through the condenser. Then, the water is transported to the evaporator 12 of the water source heat pump unit 18 by the circulating water pump, and exchanges heat with the water at the user end, taking away the heat of the user end, realizing the refrigeration effect.

[0034] In the heating mode, the air source heat pump unit 17 absorbs cold from the air and transfers the cold to the water through the evaporator. Then, the water is transported to the condenser 13 of the water source heat pump unit 18 by the circulating water pump, and exchanges heat with the water at the user end, transferring heat to the user end, realizing the heating effect.

[0035] In the energy storage mode, the air conditioning system can store the excess heat or cold into the energy storage conversion water tank 15 using the air source heat pump unit 17 or the water source heat pump unit 18. When the air conditioning system needs, the water tank can release or absorb heat to provide additional cold and heat sources for the air conditioning system.

[0036] Specifically, in actual use, the total cooling load and the total heating load need to be calculated according to the use area and the cooling and heating load demand of the building. The specific calculation method is: cooling load = area x cooling index, heating load = area x heating index. In this embodiment, the primary side equipment adopts the air source heat pump unit of the 30RQ series, the total refrigerating capacity is 1200kW, and the total heating capacity is 1224kW. The secondary side equipment adopts the water source heat pump unit of the 61XW series, the total refrigerating capacity is 2688kW, and the total heating capacity is 2880kW. The circulating water pump adopts the 200KQL series. In the scenario of the use area of the commercial building being 28000m 2 , the total cooling load is calculated to be 2800kW, and the total heating load is calculated to be 1680kW. Using the air conditioning system provided in the embodiment, the annual operation cost of the commercial building can be reduced by about 1850,000 yuan.

[0037] To sum up, the air conditioning system realizes efficient, stable and flexible cold and heat preparation and supply through reasonable equipment configuration and circulating process design. At the same time, through the precise control of the electric valve and the circulating water pump, the air conditioning system can flexibly adjust the operation mode and the water flow path according to the actual demand to meet the actual demand of different buildings and users.

[0038] It should be noted that in this application, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "including a…" does not exclude the presence of another identical element in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in the opposite order, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0039] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.

Claims

1. An air source heat pump and water source heat pump based air conditioning system, characterized by, The utility model relates to an air conditioning system with water source heat pump and air source heat pump, which comprises: a user end (9) located at the top of the air conditioning system, representing the service object of the air conditioning system; a first electric valve (1) is connected to one side of the user end (9) through a first circulating water pump (10), and a fourth electric valve (4) is directly connected to the other side of the user end (9); a pressure balance valve (11) is further connected between the first electric valve (1) and the fourth electric valve (4) and close to one side of the user end (9), used for maintaining the pressure stability of the air conditioning system; a water source heat pump unit (18) is connected to the other side between the first electric valve (1) and the fourth electric valve (4), serving as a cold and heat preparation device at the secondary side; the water source heat pump unit (18) is composed of an evaporator (12) and a condenser (13); the first electric valve (1) and the fourth electric valve (4) are respectively connected to the evaporator (12); the evaporator (12) and the condenser (13) are directly connected and are respectively connected to a sixth electric valve (6) and a seventh electric valve (7) through the condenser (13); the sixth electric valve (6) is on the same side as the first electric valve (1), and the seventh electric valve (7) is on the same side as the fourth electric valve (4); a second electric valve (2) is connected between one side of the first electric valve (1) and one side of the sixth electric valve (6); and a fifth electric valve (5) is connected between one side of the first electric valve (1) and the other side of the sixth electric valve (6); a third electric valve (3) is connected between one side of the fourth electric valve (4) and one side of the seventh electric valve (7); and an eighth electric valve (8) is connected between one side of the fourth electric valve (4) and the other side of the seventh electric valve (7); the sixth electric valve (6) and the seventh electric valve (7) are respectively connected to an energy storage conversion water tank (15); the sixth electric valve (6) and the energy storage conversion water tank (15) are further connected to a second circulating water pump (14); the energy storage conversion water tank (15) is further connected to an air source heat pump unit (17) as a cold and heat preparation device at the primary side; the energy storage conversion water tank (15) and the air source heat pump unit (17) on the same side as the second circulating water pump (14) are further connected to a third circulating water pump (16).

2. The air source heat pump and water source heat pump based air conditioning system as claimed in claim 1, wherein, The air source heat pump unit (17) has a dual-function of refrigeration and heating.

3. The air source heat pump and water source heat pump based air conditioning system as claimed in claim 1, wherein, The water source heat pump unit (18) has a dual-function of refrigeration and heating and the water outlet temperature in the heating mode is greater than or equal to 60℃.

4. The air source heat pump and water source heat pump based air conditioning system as claimed in claim 1, wherein, The first circulating water pump (10), the second circulating water pump (14) and the third circulating water pump (16) are cold-temperature water single-stage centrifugal pumps with a temperature-resistant fluid temperature of 80℃.

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