A high-rise building central air conditioning water circulation system, unit and water circulation method

Abstract

The present invention discloses a central air-conditioning water circulation system, comprising: a low-zone energy storage device, connected to a refrigeration system and to the low zone, capable of exchanging heat with the refrigeration system and with the low zone; a first heat exchanger, connected to the low-zone energy storage device; a middle-zone energy storage device, connected to the first heat exchanger and to the middle zone, capable of exchanging heat with the low-zone energy storage device through the first heat exchanger, and capable of exchanging heat with the middle zone; the central air-conditioning water circulation system using the present invention can save air-conditioning energy consumption under the premise of ensuring low water pressure; the present invention also provides a central air-conditioning unit and a central air-conditioning water circulation method.

Description

Technical Field

[0001] The present invention relates to the field of central air conditioning, and in particular to a central air conditioning water circulation system, a central air conditioning unit and a central air conditioning water circulation method. Background Art

[0002] In recent years, there are more and more high-rise or super high-rise buildings in cities, and the application of central air-conditioning has become more and more extensive. At present, in many high-rise buildings, central air-conditioning is usually designed as follows: the refrigeration room is installed in the basement room, and the outdoor heat exchange is carried out through the cooling tower installed outdoors, and the water circulation system is used to supply cooling or heating to each air-conditioning terminal in the building. In order to ensure the cooling capacity of high-rise buildings, the water pressure in the water circulation system must reach a very high level to ensure high-rise cooling, and the requirements for water pumps and pipelines are very high.

[0003] To this end, the prior art proposes a water circulation method, which divides the water circulation system into multiple areas according to the height of the building, each area is an independent water loop, and heat is transferred between two adjacent areas through a heat exchanger, and the refrigeration unit is connected to the lower area; since the cooling demand of each area in a high-rise building is different, when a user located on a high floor needs cooling, in order to supply the cold from the refrigeration unit to the user's end, it is necessary to start all the water pumps between the water circulation area where the user is located and the refrigeration unit as well as the refrigeration unit itself, resulting in a huge waste of energy and seriously reducing efficiency. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a central air conditioning water circulation system, a central air conditioning unit and a central air conditioning water circulation method, which can save air conditioning energy consumption under the premise of ensuring low water pressure.

[0005] The central air-conditioning water circulation system of one aspect of this embodiment includes: a low zone energy storage device, connected to the refrigeration system and to the low zone, capable of exchanging heat with the refrigeration system and with the low zone; a first heat exchanger, connected to the low zone energy storage device; a middle zone energy storage device, connected to the first heat exchanger and to the middle zone, capable of exchanging heat with the low zone energy storage device through the first heat exchanger, and capable of exchanging heat with the middle zone.

[0006] Furthermore, the central air conditioning water circulation system also includes: a low zone heat exchange pump, connecting the low zone energy storage device and the first heat exchanger; and a middle zone first heat exchange pump, connecting the middle zone energy storage device and the first heat exchanger.

[0007] Furthermore, a low zone water temperature sensor is provided on the low zone energy storage device, and a middle zone water temperature sensor is provided on the middle zone energy storage device.

[0008] Furthermore, a low zone delivery pump and a low zone refrigeration meter are sequentially arranged along the water flow direction between the low zone energy storage device and the low zone, and a middle zone delivery pump and a middle zone refrigeration meter are sequentially arranged along the water flow direction between the middle zone energy storage device and the middle zone.

[0009] Further, the low zone energy storage device is connected in series with the low zone, and the middle zone energy storage device is connected in series with the middle zone.

[0010] Furthermore, the central air conditioning water circulation system also includes: a second heat exchanger connected to the middle zone energy storage device; a high zone energy storage device connected to the second heat exchanger and capable of exchanging heat with the middle zone energy storage device through the second heat exchanger and connected to the high zone.

[0011] Furthermore, a high zone delivery pump is provided between the high zone energy storage device and the high zone.

[0012] The central air conditioning unit of the second aspect of the present invention comprises a refrigeration system and the above-mentioned central air conditioning water circulation system, and the refrigeration system is connected to the low-zone energy storage device.

[0013] The central air conditioning water circulation method of the third aspect of the present invention comprises the following steps: detecting the water temperature T1 in the middle zone energy storage tank; when T1 is greater than a first preset value, starting the middle zone first heat exchange pump and the low zone heat exchange pump, so that the low zone energy storage tank and the middle zone energy storage tank exchange heat through the first heat exchanger.

[0014] Furthermore, the central air conditioning water circulation method further includes the following steps: detecting the water temperature T2 in the low zone energy storage device; when T2 is greater than a second preset value, controlling the refrigeration system and the unit circulating water pump to start, so that the refrigeration system supplies cold air to the low zone energy storage device;

[0015] The central air-conditioning water circulation system of the present invention is applied. When in use, cold energy is supplied to the low-zone energy storage device through the refrigeration system. When the middle-zone energy storage device lacks cold energy, heat can be exchanged through the first heat exchanger so that the low-zone energy storage device exchanges heat with the middle-zone energy storage device. When the low-zone or the middle-zone needs cooling, cold energy can be obtained from the low-zone energy storage device or the middle-zone energy storage device. That is, when each area in the water circulation system needs cold energy, cold energy can be called from its corresponding energy storage device first, without starting other equipment including the refrigeration system, thereby effectively saving air-conditioning energy consumption. At the same time, the setting of multiple circulation areas also effectively reduces the water pressure of the water channels in each area.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 A schematic diagram of a central air-conditioning water circulation system according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a refrigeration system according to an embodiment of the present invention;

[0020] The above drawings contain the following reference numerals:

[0021] DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] Reference Figure 1 A central air conditioning water circulation system, characterized in that it includes: a low zone energy storage device 13, connected to a refrigeration system 100 and to a low zone 200, capable of exchanging heat with the refrigeration system 100 and with the low zone 200; a first heat exchanger 18, connected to the low zone energy storage device 13; a middle zone energy storage device 28, connected to the first heat exchanger 18 and to the middle zone 300, capable of exchanging heat with the low zone energy storage device 13 through the first heat exchanger 18, and capable of exchanging heat with the middle zone 300.

[0027] When the central air-conditioning water circulation system of the present invention is used, cold energy is supplied to the low-zone energy storage device 13 through the refrigeration system 100. When the middle-zone energy storage device 28 lacks cold energy, heat can be exchanged through the first heat exchanger 18, so that the low-zone energy storage device 13 exchanges heat with the middle-zone energy storage device 28. When the low-zone 200 or the middle-zone 300 needs cooling, cold energy can be obtained from the low-zone energy storage device 13 or the middle-zone energy storage device 28. That is, when each area in the water circulation system needs cold energy, cold energy can be called from the corresponding energy storage device first, without starting other equipment including the refrigeration system 100, thereby effectively saving air-conditioning energy consumption. At the same time, the setting of multiple circulation areas also effectively reduces the water pressure of the water channels in each area.

[0028] It should be understood that in this embodiment, low, medium and high are merely used to describe that the water circulation loop is suitable for an indoor heat exchange area at a certain location in a corresponding high-rise building, and does not mean a limitation on the installation position of each component.

[0029] The structure of the refrigeration system 100 may refer to the prior art, or may be as follows: Figure 2 As shown, it includes a refrigeration unit 1 and a cooling tower 4, water or other heat exchange medium circulates between the refrigeration system 100 and the cooling tower 4, and a unit circulating water pump 2 is arranged between the refrigeration system 100 and the cooling tower 4 to drive the flow of water; wherein the refrigeration unit 1 can select the common water-cooled centrifugal unit or water-cooled screw unit on the market.

[0030] It should be understood that although a central air-conditioning water circulation system is provided in this embodiment, it does not mean that the heat exchange medium can only be water. In fact, the water in this embodiment can refer to all media with heat exchange function, such as water, ethanol or other liquids.

[0031] In fact, although a water pump is generally provided in the air-conditioning water circulation system in the prior art, it does not mean that the water circulation system must be operated by a water pump. In fact, according to the relevant principles of the Stirling engine, as long as a cold source and a heat source are provided in the system and the positions of each component are reasonably arranged, the water circulation system can be operated without a water pump.

[0032] Furthermore, the connection in this embodiment is different from the connection relationship in the mechanical connection. The connection in this embodiment generally includes two meanings: mechanical connection and pipeline connection.

[0033] Among them, the low zone 200 and the low zone energy storage device 13 can be connected in a variety of ways. When the low zone energy storage device 13 and the low zone 200 are connected in series, the low zone 200 can directly obtain cold energy from the low zone energy storage device 13, or transfer the cold energy to the low zone energy storage device 13 through the refrigeration system 100, and then obtain cold energy from the low zone energy storage device 13. At this time, the water flow direction in the pipeline of the low zone 200 can be kept consistent without reversing; and when the low zone 200 and the low zone energy storage device 13 are connected in parallel, the cold energy of the refrigeration system 100 can be divided into two branches, and the low zone 200 can be supplied with cold energy while storing energy in the low zone energy storage device 13. The refrigeration system 100 can also be directly controlled to supply cold energy to the low zone 200 without the low zone energy storage device 13, which is convenient for operation.

[0034] like Figure 1 As shown, the central air-conditioning water circulation system may further include a low zone heat exchange pump 22 and a middle zone first heat exchange pump 25, the low zone heat exchange pump 22 connecting the low zone energy storage device 13 and the first heat exchanger 18; the middle zone first heat exchange pump 25 connecting the middle zone energy storage device 28 and the first heat exchanger 18; at this time, when the cooling capacity of the middle zone energy storage device 28 is insufficient, the low zone heat exchange pump 22 and the middle zone first heat exchange pump 25 may be turned on to allow the low zone energy storage device 13 to supply cooling to the middle zone energy storage device 28, and the low zone heat exchange pump 22 and the middle zone first heat exchange pump 25 may be turned off after the cooling is completed to terminate the heat exchange; when the middle zone 300 does not need cooling, the low zone energy storage device 13 may be prevented from continuously exchanging heat with the middle zone energy storage device 28, resulting in a waste of cooling capacity; here, when the middle zone energy storage device 28 needs cooling capacity and the low zone energy storage device 13 has sufficient cooling capacity, it is sufficient to turn on the two heat exchange pumps without turning on the refrigeration system 100.

[0035] Furthermore, in order to determine the cooling capacity of the low zone energy storage device 13 and the middle zone energy storage device 28 and to properly allocate the energy of the two energy storage devices, a low zone water temperature sensor 14 is provided on the low zone energy storage device 13 and a middle zone water temperature sensor 29 is provided on the middle zone energy storage device 28; by providing the water temperature sensor and detecting the water temperature in the low zone energy storage device 13 and the middle temperature energy storage device, the cooling capacity storage condition in the energy storage device can be determined.

[0036] Furthermore, in order to facilitate the energy storage device to provide cooling to the corresponding areas, a low zone delivery pump 23 and a low zone cold meter 24 are sequentially arranged along the water flow direction between the low zone energy storage device 13 and the low zone 200, and a middle zone delivery pump 39 and a middle zone cold meter 40 are sequentially arranged along the water flow direction between the middle zone energy storage device 28 and the middle zone 300; when the middle zone 300 or the area does not need cooling, it is only necessary to turn off the area delivery pump or the middle zone delivery pump 39; when the water circulation system only needs to exchange heat between the middle zone energy storage device 28 and the low zone energy storage device 13 and does not need to provide cooling to the middle zone 300, the middle zone delivery pump 39 can be turned off, and the low zone heat exchange pump 22 and the middle zone first heat exchange pump 25 can be turned on; wherein, the setting of the two cold meters can conveniently measure the cooling consumed by the low zone 200 and the middle zone 300; and can provide the control system with information on whether there is a user who needs cooling in the low zone 200 or the middle zone 300, so as to facilitate the control of the operation of each component.

[0037] like Figure 1 As shown, in order to reduce the water flow reversal in the water circulation system, the low zone energy storage device 13 is connected in series with the low zone 200, and the middle zone energy storage device 28 is connected in series with the middle zone 300.

[0038] In order to further reduce the water pressure in the water channel and further improve the cooling effect for higher-level buildings, the central air-conditioning water circulation system also includes: a second heat exchanger 33, connected to the middle zone energy storage device 28; a high zone energy storage device 45, connected to the second heat exchanger 33, and capable of exchanging heat with the middle zone energy storage device 28 through the second heat exchanger 33, and connected to the high zone 400.

[0039] Furthermore, a high-zone delivery pump 43 is provided between the high-zone energy storage device 45 and the high-zone 400; when the high-zone 400 does not need to be cooled, the high-zone delivery pump 43 can be turned off.

[0040] It should be noted that, although not shown in the figure, the low zone 200, the middle zone 300 and the high zone 400 are connected to both a water supply waterway and a return waterway.

[0041] like Figure 1 As shown, a high zone heat exchange pump 36 is connected between the high zone energy storage device 45 and the second heat exchanger 33, a middle zone second heat exchange pump 38 is provided between the middle zone energy storage device 28 and the second heat exchanger 33, and a high zone water temperature sensor 46 is provided on the high zone energy storage device 45 for detecting the water temperature inside the high zone energy storage device 45, thereby determining whether the high zone energy storage device 45 lacks cooling capacity.

[0042] When the high zone water temperature sensor 46 detects that the water temperature of the high zone 400 is higher than a preset value, the high zone heat exchange pump 36 and the middle zone second heat exchange pump 38 can be turned on, so that the middle zone energy storage device 28 supplies cold air to the high zone 400 heat exchanger through the second heat exchanger 33; and when the high zone 400 does not need cold air, the high zone heat exchange pump 36 and the middle zone second heat exchange pump 38 can be controlled to stop working, so that the cold air will not be delivered to the high zone energy storage device 45, thereby reducing the waste of cold air.

[0043] Among them, a high zone delivery pump 43 and a high zone cold meter 41 may be sequentially arranged between the high zone energy storage device 45 and the high zone 400 along the flow direction of the water channel.

[0044] It is understandable that the first heat exchanger 18 and the second heat exchanger 33 can adopt various methods to exchange heat between the energy storage devices, such as using a plate heat exchanger and a shell and tube heat exchanger.

[0045] like Figure 1 In the preferred scheme shown, each energy storage device can obtain cold energy only from the adjacent energy storage device. At this time, it is only necessary to start the heat exchange pumps on both sides of the heat exchanger; and whether the refrigeration unit 1 is driven can only depend on whether the low-zone energy storage device 13 lacks cold energy; therefore, when the central air-conditioning has fewer cooling terminals, the components that must be operated in the water circulation system are greatly reduced, so the energy-saving effect of the entire central air-conditioning system is significantly improved.

[0046] The central air-conditioning refrigeration unit 1 of the second aspect of this embodiment comprises a refrigeration system 100 and the above-mentioned central air-conditioning water circulation system, wherein the refrigeration system 100 is connected to the low-zone energy storage device 13 .

[0047] like Figure 1 As shown, the central air conditioning unit further includes a refrigeration circulation pump 10 for driving the water flow between the low zone energy storage tank 13 and the refrigeration system 100 .

[0048] The central air conditioning water circulation method of the third aspect of the present embodiment comprises the following steps: detecting the water temperature T1 in the middle zone energy storage tank 28; when T1 is greater than a first preset value, starting the middle zone first heat exchange pump 25 and the low zone heat exchange pump 22, so that the low zone energy storage tank 13 and the middle zone energy storage tank 28 exchange heat through the first heat exchanger 18; wherein the first preset value can be reasonably determined according to parameters such as the system load and the local environment, and when T1 is greater than the first preset value, it means that the middle zone energy storage tank 28 lacks cooling capacity.

[0049] Furthermore, the central air conditioning water circulation method may also include: detecting the water temperature T2 in the low zone energy storage tank 13; when T2 is greater than a second preset value, controlling the refrigeration system 100 and the unit circulating water pump 2 to start, so that the refrigeration system 100 supplies cold air to the low zone energy storage tank 13.

[0050] It should be noted that the description of the method in this embodiment is not equivalent to limiting the sequence of method steps.

[0051] Furthermore, the water temperature T3 in the high zone energy storage tank 45 can be detected. When T3 is higher than a preset value, that is, the high zone energy storage tank 45 lacks cold energy, the middle zone second heat exchange pump 38 and the high zone heat exchange pump 36 can be pneumatically controlled so that the cold energy of the middle zone energy storage tank 28 can be supplied to the high zone energy storage tank 45.

[0052] It is understandable that the water temperature T1 of the middle energy storage tank 28 can be detected in a variety of ways, such as by providing a temperature probe on the middle energy storage tank 28, or by manual measurement.

[0053] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A central air conditioning water circulation system, characterized in that: include: A low zone energy storage device (13) is connected to the refrigeration system (100) and to the low zone (200), and is capable of exchanging heat with the refrigeration system (100) and is capable of exchanging heat with the low zone (200); A first heat exchanger (18) connected to the low zone energy storage device (13); a middle zone energy storage device (28), connected to the first heat exchanger (18) and to the middle zone (300), and capable of exchanging heat with the low zone energy storage device (13) via the first heat exchanger (18), and capable of exchanging heat with the middle zone (300); A low zone heat exchange pump (22), connected to the low zone energy storage device (13) and the first heat exchanger (18); A middle zone first heat exchange pump (25), connected to the middle zone energy storage device (28) and the first heat exchanger (18); A second heat exchanger (33) connected to the middle zone energy storage device (28); The high zone energy storage device (45) is connected to the second heat exchanger (33), is capable of exchanging heat with the middle zone energy storage device (28) through the second heat exchanger (33), and is connected to the high zone (400).

2. The central air conditioning water circulation system according to claim 1, characterized in that: The low-zone energy storage device (13) is provided with a low-zone water temperature sensor (14), and the middle-zone energy storage device (28) is provided with a middle-zone water temperature sensor (29).

3. The central air conditioning water circulation system according to claim 2, characterized in that: A low zone delivery pump (23) and a low zone cold meter (24) are sequentially arranged along the water flow direction between the low zone energy storage device (13) and the low zone (200), and a middle zone delivery pump (39) and a middle zone cold meter (40) are sequentially arranged along the water flow direction between the middle zone energy storage device (28) and the middle zone (300).

4. The central air conditioning water circulation system according to any one of claims 1 to 3, characterized in that: The low zone energy storage device (13) is connected in series with the low zone (200), and the middle zone energy storage device (28) is connected in series with the middle zone (300).

5. The central air conditioning water circulation system according to claim 1, characterized in that: A high zone delivery pump (43) is provided between the high zone energy storage device (45) and the high zone (400).

6. A central air conditioning unit, characterized in that: include: Refrigeration system (100); The central air-conditioning water circulation system according to any one of claims 1 to 5, wherein the refrigeration system (100) is connected to the low-zone energy storage device (13).

7. A central air conditioning water circulation method, characterized in that: A central air conditioning unit according to claim 6 comprises the following steps: Detecting the water temperature T1 in the middle zone energy storage device (28); When T1 is greater than a first preset value, the middle zone first heat exchange pump (25) and the low zone heat exchange pump (22) are started, so that the low zone energy storage device (13) and the middle zone energy storage device (28) exchange heat through the first heat exchanger (18).

8. The central air conditioning water circulation method according to claim 7, characterized in that: The following steps are also included: Detecting the water temperature T2 in the low zone energy storage device (13); When T2 is greater than a second preset value, the refrigeration system (100) and the unit circulating water pump (2) are controlled to start, so that the refrigeration system (100) supplies cold air to the low-zone energy storage device (13).

Images