A zoned two-pipe evaporative heat pump cooling and heating system

Abstract

The present invention relates to a zoned two-pipe evaporative cooling and heat pump cooling and heating system, comprising a heat recovery type evaporative cooling and heat pump A, an outer zone dry pipe group, and an inner zone dry pipe group; the chilled water outlet and return pipes of the heat recovery type evaporative cooling and heat pump A are connected to the inner zone dry pipe group and the outer zone dry pipe group pipes to provide cooling and heating to the inner and outer zones; the hot water outlet and return pipes of the heat recovery type evaporative cooling and heat pump A are connected to the inner zone dry pipe group and the outer zone dry pipe group pipes to provide cooling and heating to the inner and outer zones; the beneficial effect is that the water temperature can be changed according to the energy demand of different types of buildings, and the zones can be divided according to different air treatment processes, and the same treatment process is classified into one zone.

Description

Technical Field

[0001] The invention relates to the technical field of cold and heat pump systems, in particular to a zoned two-pipe evaporative cold and heat pump cold and heat supply system. Background Art

[0002] Evaporative heat pump is a new energy-saving air conditioning system. The principle of evaporative cooling is to spray water onto the surface of the condenser to form a water film, which is in direct contact with the air for heat and moisture exchange. Part of the water absorbs the latent heat of vaporization and evaporates into water vapor, which is discharged by the fan, thereby promoting the discharge of condensation heat. The heat exchange efficiency of evaporative heat pump is significantly higher than that of air-cooled heat pump and water-cooled unit, and the cooling water system is simplified. Compared with traditional chillers, it can save more than 15% energy and more than 30% energy compared with air-cooled heat pump.

[0003] However, evaporative heat pumps can only achieve simple cooling and heating functions at present, with relatively single functions, and their energy-saving potential has not been fully tapped. How to design the structure to adapt to various scenarios and reduce costs is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a zoned two-pipe evaporative heat pump cooling and heating system, which can realize the functions of free heating while cooling, free cooling while heating, and free evaporative cooling, and also realizes the application of dual cold source temperature and humidity control technology and the dehumidification function during the return of south wind.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: In the first aspect, a zoned two-pipe evaporative cooling and heating pump cooling and heating system is protected, comprising: a heat recovery type evaporative cooling and heating pump A, an outer zone dry pipe group, and an inner zone dry pipe group;

[0006] The chilled water outlet and return pipes of the heat recovery evaporative cooling and heat pump A are connected to the inner zone main pipe group and the outer zone main pipe group to supply cooling and heating to the inner and outer zones;

[0007] The hot water outlet and return pipes of the heat recovery evaporative cooling and heat pump A are connected to the inner zone main pipe group and the outer zone main pipe group to supply cooling and heating to the inner and outer zones;

[0008] The heat recovery type evaporative cooling heat pump A comprises an evaporative cooling heat exchanger, a plate heat exchanger, and a first water pump. The evaporative cooling heat exchanger is connected to the water inlet and outlet pipes on the primary side of the plate heat exchanger, and the water inlet and outlet on the secondary side of the plate heat exchanger are connected to the outer zone dry pipe group and the inner zone dry pipe group pipes;

[0009] The water outlet of the first water pump is connected to the water inlet pipe of the primary side of the plate heat exchanger, so as to transport cooling water to the plate heat exchanger for heat exchange or return to the evaporative heat exchanger.

[0010] In a further technical solution, the heat recovery evaporative heat pump A further comprises an air-cooled heat exchanger, a water-cooled heat exchanger, a compressor, and a reversing valve connected by pipelines;

[0011] The inlet end of the air-cooled heat exchanger is connected to the refrigerant pipe of the evaporative heat exchanger, and the outlet end of the air-cooled heat exchanger is divided into two paths, which are respectively connected to the first port of the reversing valve and the compressor pipe;

[0012] The outlet end of the primary side of the water-cooled heat exchanger is connected to the second port of the reversing valve, and the inlet end is connected to the refrigerant pipe of the evaporative heat exchanger; the water outlet end and water inlet end of the secondary side of the water-cooled heat exchanger are both connected to the outer zone dry pipe group and the inner zone dry pipe group;

[0013] The compressor is connected to the third port pipeline of the reversing valve;

[0014] The fourth port of the reversing valve is connected to the refrigerant pipe of the evaporative heat exchanger.

[0015] In a further technical solution, the external zone main pipe group includes an external zone water supply main pipe and an external zone water return main pipe;

[0016] The inner area main pipe group includes an inner area water supply main pipe and an inner area return water main pipe;

[0017] The chilled water outlet pipe of the heat recovery evaporative heat pump A is divided into two paths, one of which is connected to the outer zone water supply main pipe and is provided with a first valve, and the other is connected to the inner zone water supply main pipe and is provided with a second valve;

[0018] The chilled water return pipe of the heat recovery type evaporative heat pump A is divided into two paths, one of which is connected to the outer zone return water main pipe and is provided with a third valve, and the other is connected to the inner zone return water main pipe and is provided with a fourth valve;

[0019] The hot water outlet pipe of the heat recovery type evaporative heat pump A is divided into two paths, one of which is connected to the outer zone water supply main pipe and is provided with a fifth valve, and the other is connected to the inner zone water supply main pipe and is provided with a sixth valve;

[0020] The hot water return pipe of the heat recovery type evaporative heat pump A is divided into two paths, one of which is connected to the outer zone return main pipe and is provided with a seventh valve, and the other is connected to the inner zone return main pipe and is provided with an eighth valve.

[0021] A further technical solution also includes a fresh air unit B and an air conditioning unit C;

[0022] The fresh air unit B and the air conditioning unit C are each provided with an outer zone coil and an inner zone coil;

[0023] The two ends of the outer zone coil are respectively connected to the outer zone water supply main pipe and the outer zone return water main pipe, and the two ends of the inner zone coil are respectively connected to the inner zone water supply main pipe and the inner zone return water main pipe.

[0024] A further technical solution further includes two fan coil units D, one of the fan coil units D having an outer zone coil unit for serving an outer zone, and the other fan coil unit D having an inner zone coil unit for serving an inner zone;

[0025] The two ends of the outer zone coil are respectively connected to the outer zone water supply main pipe and the outer zone return water main pipe, and the two ends of the inner zone coil are respectively connected to the inner zone water supply main pipe and the inner zone return water main pipe.

[0026] In a further technical solution, the evaporative heat exchanger further comprises a spray pipe, a fan, and a water receiving tray located in its shell;

[0027] The spray pipe is located above the refrigerant pipe to spray cooling water to the refrigerant pipe to form a water film, the water receiving pan is located below the water film, and the first water pump is used to transport the cooling water in the water receiving pan to the plate heat exchanger to perform heat exchange with water from the demand side of the second water pump in the plate heat exchanger;

[0028] The fan is used to discharge evaporated water vapor out of the housing;

[0029] The spray pipe is provided with a tenth valve, and the pipeline where the tenth valve is located is provided with two branches extending out of the evaporative heat exchanger, and the two branches are respectively connected to the inlet and outlet of the primary side of the plate heat exchanger.

[0030] According to a further technical solution, a first air inlet is further provided on the shell of the evaporative heat exchanger, and the first air inlet is opposite to the water film, so as to blow air toward the water film for heat exchange.

[0031] The second aspect provides a cooling and heating method for a zoned two-pipe evaporative cooling and heating pump cooling and heating system, which is applied to the zoned two-pipe evaporative cooling and heating pump cooling and heating system described in the first aspect, and comprises the following steps:

[0032] Step 1: Divide the air into zones according to the air treatment process, and the same treatment process is classified into the same zone;

[0033] Step 2: According to the energy demand of different seasons and buildings, the required water temperature in the corresponding zone is determined, and then variable water temperature operation is performed;

[0034] Among them, variable water temperature operation is achieved by adjusting the operating conditions of the heat recovery evaporative heat pump A and coordinating the switching of valves on the outer zone main pipe group and the inner zone main pipe group.

[0035] As a further technical solution, in step 1, the air treatment process is divided into three treatment processes: cooling, heating, and cooling first and then heating;

[0036] When zoning, it is divided into external zone and internal zone, and the fresh air unit B, air conditioning unit C, and fan coil unit D are connected according to the scene requirements to provide cooling and heating.

[0037] As a further technical solution, the valves on the outer zone main pipe group and the inner zone main pipe group are the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, and the eighth valve.

[0038] The beneficial effects of the present invention are:

[0039] 1. The present invention divides the air into different zones according to different air treatment processes, and the same treatment process is classified into the same zone, and variable water temperature operation is performed according to the energy demand of different types of buildings and different seasons;

[0040] 2. It can provide free heat while providing cooling, free cold while providing heating, and free cooling by evaporative cooling. At the same time, it also realizes the application of dual cold source temperature and humidity control technology and the dehumidification function during the return of south wind, giving full play to the energy-saving potential and various functions of evaporative cooling technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a flow chart of the system of the present invention;

[0042] Figure 2 This is a system flow chart of Embodiment 2 of the present invention;

[0043] Figure 3 This is a system flow chart of Embodiment 3 of the present invention;

[0044] Figure 4 This is a system flow chart of Embodiment 4 of the present invention;

[0045] Figure 5 is a system flow chart of Embodiment 5 of the present invention;

[0046] Figure 6 is a system flow chart of Embodiment 6 of the present invention;

[0047] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0048] External zone water supply main 1, external zone return main 2, internal zone water supply main 3, internal zone return main 4, first valve 5, second valve 6, third valve 7, fourth valve 8, fifth valve 9, sixth valve 10, seventh valve 11, eighth valve 12, evaporative heat exchanger 13, plate heat exchanger 14, first water pump 15, spray pipe 16, fan 17, water receiving tray 18, refrigerant pipe 19, second water pump 20, tenth valve 21, eleventh valve 22, twelfth valve 23, first air inlet 24, second air inlet 25, air-cooled heat exchanger 26, water-cooled heat exchanger 27, compressor 28, reversing valve 29, ninth valve 30, expansion valve 31, external zone coil 32, internal zone coil 33, hot and cold water pump 34. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0050] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0051] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details to obscure the description of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0052] Example 1

[0053] In order to meet the energy needs of different types of buildings, it provides hot and cold water of appropriate temperature on demand, provides free heat while providing cooling, provides free cooling while providing heating, and has the functions of free cooling by evaporative cooling. Figure 1As shown, the present invention provides a zoned two-pipe evaporative heat pump cooling and heating system, including a heat recovery type evaporative heat pump A, an outer zone dry pipe group, and an inner zone dry pipe group; the outer zone dry pipe group here belongs to the outer zone, and the inner zone dry pipe group belongs to the inner zone. Specifically, the zones are divided according to different air treatment processes, and the same treatment process is classified into the same zone.

[0054] The chilled water outlet and return pipes of the heat recovery evaporative cooling and heat pump A are connected to the inner zone main pipe group and the outer zone main pipe group to supply cooling and heating to the inner and outer zones;

[0055] The hot water outlet and return pipes of the heat recovery evaporative heat pump A are connected to the inner zone main pipe group and the outer zone main pipe group to supply cooling and heating to the inner and outer zones;

[0056] In more detail, the external area main pipe group includes an external area water supply main pipe 1 and an external area return water main pipe 2;

[0057] The inner zone main pipe group includes an inner zone water supply main pipe 3 and an inner zone water return main pipe 4;

[0058] The chilled water outlet pipe of the heat recovery evaporative heat pump A is divided into two paths, one of which is connected to the outer zone water supply main pipe 1 and is provided with a first valve 5, and the other is connected to the inner zone water supply main pipe 3 and is provided with a second valve 6, and the water volume is controlled by the first valve 5 and the second valve 6;

[0059] The chilled water return pipe of the heat recovery evaporative heat pump A is divided into two paths, one of which is connected to the outer zone return main pipe 2 and is provided with a third valve 7, and the other is connected to the inner zone return main pipe 4 and is provided with a fourth valve 8, and the water volume is controlled by the third valve 7 and the fourth valve 8;

[0060] The hot water outlet pipe of the heat recovery type evaporative heat pump A is divided into two paths, one of which is connected to the external zone water supply main pipe 1 and is provided with a fifth valve 9, and the other is connected to the internal zone water supply main pipe 3 and is provided with a sixth valve 10, and the water volume is controlled by the fifth valve 9 and the sixth valve 10;

[0061] The hot water return pipe of the heat recovery type evaporative heat pump A is divided into two paths, one of which is connected to the outer zone return main pipe 2 and is provided with a seventh valve 11, and the other is connected to the inner zone return main pipe 4 and is provided with an eighth valve 12, and the water volume is controlled by the seventh valve 11 and the eighth valve 12;

[0062] In the specific implementation process, multiple heat recovery evaporative heat pumps A can be provided, and the specific number used depends on the actual scene requirements.

[0063] The heat recovery type evaporative cooling heat pump A comprises an evaporative cooling heat exchanger 13, a plate heat exchanger 14, and a first water pump 15. The evaporative cooling heat exchanger 13 is connected to the water inlet and outlet pipes of the primary side of the plate heat exchanger 14. The water inlet and outlet of the secondary side of the plate heat exchanger 14 are connected to the outer zone dry pipe group and the inner zone dry pipe group pipes to provide water after heat exchange.

[0064] The water outlet of the first water pump 15 is connected to the water inlet pipe of the primary side of the plate heat exchanger 14 to transport cooling water to the plate heat exchanger 14 for heat exchange or reflux to the evaporative heat exchanger 13 .

[0065] In a specific implementation process, the evaporative heat exchanger 13 further includes a spray pipe 16, a fan 17, and a water receiving tray 18 located in its shell.

[0066] The spray pipe 16 is located above the refrigerant pipe 19 to spray cooling water to the refrigerant pipe 19 to form a water film, the water receiving pan 18 is located below the water film, and the first water pump 15 is used to transport the cooling water in the water receiving pan 18 to the plate heat exchanger 14 to perform heat exchange with the water from the demand side of the second water pump 20 in the plate heat exchanger 14;

[0067] The fan 17 is used to discharge the evaporated water vapor out of the housing;

[0068] The spray pipe 16 is provided with a tenth valve 21. The pipeline where the tenth valve 21 is located is provided with two branches extending out of the evaporative heat exchanger 13. The two branches are respectively connected to the inlet and outlet of the primary side of the plate heat exchanger 14, so as to accurately control the water volume. The branch connected to the inlet of the primary side of the plate heat exchanger 14 is provided with an eleventh valve 22, and the branch connected to the outlet of the primary side of the plate heat exchanger 14 is provided with a twelfth valve 23.

[0069] The second water pump 20 is disposed in a cooling / heating pipe on the secondary side of the plate heat exchanger 14 , and the cooling / heating pipe is connected to the external demand side.

[0070] In more detail, the shell of the evaporative heat exchanger 13 is also provided with a first air inlet 24, and the first air inlet 24 is opposite to the water film, and is used to blow air to the water film for heat exchange. In order to increase the heat exchange efficiency between the cooling water and the refrigerant pipe 19, a second air inlet 25 is also provided on the shell.

[0071] In order to provide chilled water / hot water to the outer zone dry pipe group and the inner zone dry pipe group, the heat recovery type evaporative heat pump A further includes an air-cooled heat exchanger 26, a water-cooled heat exchanger 27, a compressor 28, and a reversing valve 29 connected by pipelines;

[0072] The inlet end of the air-cooled heat exchanger 26 is connected to the refrigerant pipe 19 of the evaporative heat exchanger 13, and the outlet end of the air-cooled heat exchanger 26 is divided into two paths, which are respectively connected to the first port of the reversing valve 29 and the compressor 28 pipeline;

[0073] The outlet end of the primary side of the water-cooled heat exchanger 27 is connected to the second port of the reversing valve 29, and the inlet end is connected to the refrigerant pipe 19 of the evaporative heat exchanger 13; the water outlet end and the water inlet end of the secondary side of the water-cooled heat exchanger 27 are connected to the outer zone dry pipe group and the inner zone dry pipe group;

[0074] The compressor 28 is connected to the third port of the reversing valve 29 through a pipeline; the fourth port of the reversing valve 29 is connected to the refrigerant pipe 19 of the evaporative heat exchanger 13 through a pipeline.

[0075] In order to precisely control the amount of water / gas, a ninth valve 30 for controlling the flow of refrigerant is provided in the pipeline between the reversing valve 29 and the evaporative cooling heat exchanger 13, the pipeline between the reversing valve 29 and the air-cooling heat exchanger 26, the outlet pipeline of the refrigerant pipe 19, and the inlet of the air-cooling heat exchanger 26. An expansion valve 31 is provided at the inlet end of the water-cooling heat exchanger 27.

[0076] See also Figure 1 The operating conditions and process of the heat recovery evaporative heat pump A in this embodiment are as follows:

[0077] ①. Low / medium temperature cooling:

[0078] The refrigerant's running path is: the refrigerant flows from one outlet end of the water-cooled heat exchanger 27 to the second port of the reversing valve 29, then is transported to the compressor 28 through the first port of the reversing valve 29 through the pipeline, and then returns to the reversing valve 29, and enters the refrigerant pipe 19 through the fourth port of the reversing valve 29. The refrigerant exchanges heat with the cooling water sprayed from the spray pipe 16 in the evaporative heat exchanger 13 to cool down. After the cooling, the refrigerant is transported out of the evaporative heat exchanger 13, passes through the expansion valve 31, and returns to the water-cooled heat exchanger 27 to complete a refrigeration cycle. For example, the temperatures of the low-temperature and medium-temperature chilled water in this process can be 7 / 12°C and 12 / 17°C, respectively.

[0079] The running path of the cooling water is as follows: the refrigerant enters the refrigerant pipe 19 in the evaporative heat exchanger 13, the spray pipe 16 is opened to spray cooling water onto the refrigerant pipe 19 to form a water film, the cooling water temperature rises and flows down into the shell, at this time, the first air inlet 24 is opened, so that the cooling water after flowing down exchanges heat with the air coming in from the first air inlet 24 and then drops to a suitable temperature, and then is transported to the spray pipe 16 through the first water pump 15 and the tenth valve 21 for spraying to complete a cycle.

[0080] For example, the temperature of the cooling water may be 32 / 37°C.

[0081] ②. Low / medium temperature cooling and free heating at the same time:

[0082] The running path of the refrigerant is the same as that in ① above, so I will not elaborate on it here;

[0083] The running path of cooling water is as follows: the refrigerant enters the refrigerant pipe 19 in the evaporative heat exchanger 13, the spray pipe 16 is opened to spray cooling water to the refrigerant pipe 19 to form a water film, the cooling water temperature rises and flows down into the shell, and then is transported to the plate heat exchanger 14 through the first water pump 15 and the eleventh valve 22 for heat exchange. The cooling water after heat exchange and cooling flows through the twelfth valve 23 and then returns to the spray pipe 16 for spraying to complete a cycle. In this process, the first air inlet 24 can be closed or its size can be adjusted according to the situation to control the heat (the cooling water after flowing down can be cooled after heat exchange with the air coming in from the first air inlet 24).

[0084] For example, the temperature of the cooling water may be 35 / 30°C.

[0085] ③. Free cooling in winter, during which the refrigerant does not run:

[0086] The running path of the cooling water is the same as that in ② above, so it will not be repeated here. It should be noted that: the first air inlet 24 can be opened to improve the cooling efficiency.

[0087] For example, the temperature of the cooling water may be 12 / 17°C.

[0088] ④. Free cooling while providing heating:

[0089] The operation path of the refrigerant is: the refrigerant is transported from the outlet end of the water-cooled heat exchanger 27 through the expansion valve 31 and the ninth valve 30 to the spray pipe 16 of the evaporative heat exchanger 13, and the refrigerant is discharged from the evaporative heat exchanger 13 and enters the reversing valve 29 after heat exchange with the cooling water to increase the temperature, and is connected to the compressor 28 through the first port of the reversing valve 29. After being compressed by the compressor 28, it returns to the reversing valve 29, and is then discharged through the second port of the reversing valve 29 and transported to the water-cooled heat exchanger 27 to complete a heating cycle.

[0090] For example, the temperature of the warm water in the process may be 45 / 40°C.

[0091] The operation path of the cooling water is the same as that of ② above, so it will not be repeated here. It should be noted that the temperature of the cooling water in this process can be 12 / 17°C.

[0092] ⑤. Heating, during which the evaporative heat exchanger 13 does not operate:

[0093] The refrigerant's running path is: the refrigerant is transported from the air-cooled heat exchanger 26 to the compressor 28 for compression, the high-pressure refrigerant enters from the third port of the reversing valve 29 and is then transported from its second port through a pipeline to the water-cooled heat exchanger 27, and the high-temperature and high-pressure refrigerant is heat exchanged and cooled in the water-cooled heat exchanger 27 and then transported to the air-cooled heat exchanger 26 through the expansion valve 31.

[0094] For example, the temperature of the warm water in the process may be 45 / 40°C.

[0095] The water temperature of the two-pipe zone in the present invention is variable according to the energy demand of different types of buildings and different seasons. The following specific examples are described in terms of energy demand of different types of buildings (see Examples 2-6):

[0096] Example 2

[0097] Applicable to buildings with high internal heat generation, such as commercial projects where internal areas require year-round cooling (see Figure 2 ), based on the content of Example 1, a zoned two-pipe evaporative heat pump cooling and heating system also includes a fresh air unit B, an air conditioning unit C, and two fan coil units D;

[0098] The fresh air unit B and the air conditioning unit C are both provided with an outer zone coil 32 and an inner zone coil 33;

[0099] The two ends of the outer zone coil 32 are respectively connected to the outer zone water supply main pipe 1 and the outer zone return water main pipe 2, and the two ends of the inner zone coil 33 are respectively connected to the inner zone water supply main pipe 3 and the inner zone return water main pipe 4.

[0100] Two fan coil units D, one of which is provided with an outer zone coil unit 32 to serve an outer zone, and the other of which is provided with an inner zone coil unit 33 to serve an inner zone;

[0101] The two ends of the outer zone coil 32 are respectively connected to the outer zone water supply main pipe 1 and the outer zone return water main pipe 2, and the two ends of the inner zone coil 33 are respectively connected to the inner zone water supply main pipe 3 and the inner zone return water main pipe 4.

[0102] In this embodiment, the fresh air unit B and the air conditioning unit C adopt four-pipe fresh air / air conditioning units, and the fan coil unit D adopts a two-pipe fan coil unit. The fan coil unit connected to the inner zone dry pipe only serves the inner zone, and the fan coil unit connected to the outer zone dry pipe only serves the outer zone.

[0103] The supply and return water temperature of the inner zone water pipes: medium-temperature chilled water in summer (e.g. 12 / 17°C), medium-temperature chilled water in transitional seasons (e.g. 12 / 17°C), and medium-temperature chilled water in winter (e.g. 12 / 17°C); the specific working conditions are as follows:

[0104] ①. Medium-temperature chilled water in summer: The chilled water after heat exchange flows out from the second valve 6 of the water-cooled heat exchanger 27, passes through the inner zone water supply main pipe 3, the inner zone coil 33, the inner zone return water main pipe 4, the fourth valve 8, the hot and cold water pump 34 in sequence, and then returns to the water-cooled heat exchanger 27 to form a cooling cycle.

[0105] This process is connected with the refrigerant path of the medium-temperature cooling in Example 1 (such as ① / ② in Example 1) to form a complete working condition, which will not be described in detail here.

[0106] ②. Medium-temperature chilled water in transition season: This is the same as the summer cooling path mentioned above ①, so it will not be elaborated here.

[0107] ③. Medium-temperature chilled water in winter: The chilled water after heat exchange is discharged from the plate heat exchanger 14, and returns to the plate heat exchanger 14 after passing through the sixth valve 10, the inner zone water supply main pipe 3, the inner zone coil 33, the inner zone return water main pipe 4, the eighth valve 12, and the second water pump 20 to form a cooling system.

[0108] This process is connected with the refrigerant path of the medium-temperature cooling in Example 1 (such as ④ in Example 1) to form a complete working condition, which will not be described in detail here.

[0109] The supply and return water temperature of the external zone water pipe is: low-temperature chilled water in summer (e.g. 7 / 12°C), no operation in transition season, and medium-temperature hot water in winter (e.g. 45 / 40°C); the specific operating conditions are as follows:

[0110] ①. Low-temperature chilled water in summer: The chilled water after heat exchange flows out from the first valve 5 of the water-cooled heat exchanger 27, passes through the external zone water supply pipeline, the external zone coil 32, the external zone return water main 2, the third valve 7, the hot and cold water pump 34 in sequence, and then returns to the water-cooled heat exchanger 27 to form a cooling cycle.

[0111] This process is connected with the refrigerant path of the medium-temperature cooling in Example 1 (such as ① / ② in Example 1) to form a complete working condition, which will not be described in detail here.

[0112] ②. Medium-temperature hot water in winter: The path is the same as the above-mentioned ① low-temperature chilled water in summer, so it will not be elaborated here.

[0113] This process is connected with the refrigerant path of providing heating and free cooling at the same time in Example 1 (such as ④ in Example 1) to form a complete working condition, which will not be described in detail here.

[0114] More specifically, in summer: if the system has a dehumidification demand in the transition season, the supply and return water temperatures of the inner zone water pipes can be adjusted to low-temperature chilled water (such as 7 / 12°C, and its operating path is the same as the inner zone ① summer cooling path), and the supply and return water temperatures of the outer zone water pipes can be adjusted to low-temperature hot water (for example, 35 / 30°C, and its operating path is: the water after heat exchange through the plate heat exchanger 14 passes through the fifth valve 9, the outer zone water supply main 1, the outer zone coil 32, the outer zone return main 2, the seventh valve 11, and the second water pump 20 and then returns to the plate heat exchanger 14), the fresh air is first frozen and dehumidified, and then reheated to meet the dehumidification demand.

[0115] Example 3

[0116] For ordinary fan coil + fresh air system, such as office buildings (see Figure 3 ), based on the content of Example 1, a zoned two-pipe evaporative heat pump cooling and heating system also includes a fresh air unit B, an air conditioning unit C, and a fan coil unit D;

[0117] The fresh air unit B and the air conditioning unit C are both provided with an outer zone coil 32 and an inner zone coil 33;

[0118] The two ends of the outer zone coil 32 are respectively connected to the outer zone water supply main pipe 1 and the outer zone return water main pipe 2, and the two ends of the inner zone coil 33 are respectively connected to the inner zone water supply main pipe 3 and the inner zone return water main pipe 4.

[0119] The fan coil unit D is provided with an inner zone coil unit 33, and its two ends are respectively connected with the inner zone water supply main pipe 3 and the inner zone water return main pipe 4.

[0120] In this embodiment, the fresh air unit B and the air conditioning unit C adopt four-pipe fresh air / air conditioning units, and the fan coil unit D adopts a two-pipe fan coil unit and is connected to the inner zone main pipe.

[0121] The supply and return water temperatures of the inner zone water pipes are: medium-temperature chilled water in summer (e.g. 12 / 17°C), low-temperature chilled water in transitional seasons (e.g. 7 / 12°C), and medium-temperature hot water in winter (e.g. 45 / 40°C); and the specific operating paths of medium-temperature chilled water in summer, low-temperature chilled water in transitional seasons, and medium-temperature hot water in winter are the same as ① summer cooling path of the inner zone in Example 2, and will not be repeated here.

[0122] The cooling process is connected with the refrigerant path of the medium-temperature cooling in Example 1 (such as ① / ② in Example 1) to form a complete working condition, which will not be described in detail here; the heating process is connected with the refrigerant path of the medium-temperature heating in Example 1 (such as ⑤ in Example 1) to form a complete working condition, which will not be described in detail here.

[0123] The supply and return water temperatures of the external zone water pipes are: low-temperature chilled water in summer (e.g. 7 / 12°C), low-temperature hot water in transitional seasons (e.g. 35 / 30°C), and medium-temperature hot water in winter (e.g. 45 / 40°C); the specific operating conditions are as follows:

[0124] ①. The specific operating path of low-temperature chilled water in summer and medium-temperature hot water in winter is the same as the ① summer low-temperature chilled water path in the outer zone of Example 2, and will not be repeated here.

[0125] ②. Low-temperature hot water in transition season: The water after heat exchange in the plate heat exchanger 14 returns to the plate heat exchanger 14 through the fifth valve 9, the external zone water supply main pipe 1, the external zone coil 32, the external zone return water main pipe 2, the seventh valve 11, and the second water pump 20 to form a heating cycle.

[0126] This process is connected with the path of cooling water in Example 1 (such as ② in Example 1) to form a complete working condition, which will not be described in detail here.

[0127] The inner zone coil 33 mentioned in the application process of this embodiment can be the inner zone coil 33 in the fresh air unit B, the air conditioning unit C, and the fan coil D; the outer zone coil can be the outer zone coil 32 in the fresh air unit B, the air conditioning unit C, and the fan coil D. The specific selection depends on the specific situation and is not limited one by one here.

[0128] Example 4

[0129] For variable air volume systems, such as office buildings with variable air volume systems (see Figure 4 ), based on the content of Example 1, a zoned two-pipe evaporative heat pump cooling and heating system also includes a fresh air unit B, an air conditioning unit C, and a fan coil unit D;

[0130] The fresh air unit B is provided with an outer zone coil 32, and the air conditioning unit C is provided with an inner zone coil 33;

[0131] The two ends of the outer zone coil 32 are respectively connected to the outer zone water supply main pipe 1 and the outer zone return water main pipe 2, and the two ends of the inner zone coil 33 are respectively connected to the inner zone water supply main pipe 3 and the inner zone return water main pipe 4.

[0132] The fan coil unit D is provided with an outer zone coil unit 32, and its two ends are respectively connected with the outer zone water supply main pipe 1 and the outer zone water return main pipe 2.

[0133] In this embodiment, the fresh air unit B, the air conditioning unit C, and the fan coil unit D all adopt two-pipe devices, the fresh air unit B is connected to the external zone dry pipe, the air conditioning unit C is connected to the internal zone dry pipe, and the fan coil unit D is connected to the external zone dry pipe.

[0134] The supply and return water temperatures of the inner zone water pipes are: summer low-temperature chilled water (e.g., 7 / 12°C), transitional season low-temperature chilled water (e.g., 7 / 12°C), and winter medium-temperature chilled water (e.g., 12 / 17°C). The water running paths of summer low-temperature chilled water and transitional season low-temperature chilled water are the same as the running paths of ① summer medium-temperature chilled water in the inner zone in Example 2, which will not be described in detail here; the water running path of winter medium-temperature chilled water is the same as the running path of ③ winter medium-temperature chilled water in the inner zone in Example 2, which will not be described in detail here.

[0135] The supply and return water temperatures of the water pipes in the outer zone are: low-temperature chilled water in summer (e.g. 7 / 12°C), low-temperature hot water in transitional seasons (e.g. 35 / 30°C), and medium-temperature hot water in winter (e.g. 45 / 40°C). The water paths of the low-temperature chilled water in summer and medium-temperature hot water in winter are the same as the running paths of the low-temperature chilled water in summer in the outer zone in Example 2, which will not be described in detail here; the running path of the low-temperature hot water in transitional seasons is the same as the running path of the low-temperature hot water in transitional seasons in the outer zone in Example 3, which will not be described in detail here.

[0136] Example 5

[0137] For high-end hotel projects, the project requires four-pipe control operation, and provides cooling and heating at the same time; based on the content of Example 1, a zoned two-pipe evaporative heat pump cooling and heating system also includes a fresh air unit B, an air conditioning unit C, and a fan coil D with an outer zone coil 32 and an inner zone coil 33;

[0138] The fresh air unit B and the air conditioning unit C are both provided with an outer zone coil 32 and an inner zone coil 33;

[0139] The two ends of the outer zone coil 32 are respectively connected to the outer zone water supply main pipe 1 and the outer zone return water main pipe 2, and the two ends of the inner zone coil 33 are respectively connected to the inner zone water supply main pipe 3 and the inner zone return water main pipe 4.

[0140] In the fan coil unit D, the two ends of the outer zone coil unit 32 are respectively connected to the outer zone water supply main pipe 1 and the outer zone return water main pipe 2; the two ends of the inner zone coil unit 33 are respectively connected to the inner zone water supply main pipe 3 and the inner zone return water main pipe 4.

[0141] In this embodiment, the fresh air unit B, the air conditioning unit C, and the fan coil unit D all adopt four-pipe equipment, and the two types of coil units are respectively connected to the inner zone dry pipe and the outer zone dry pipe.

[0142] The supply and return water temperatures of the inner zone water pipes are: medium-temperature chilled water in summer (e.g., 12 / 17°C), medium-temperature chilled water in transition season (e.g., 12 / 17°C), and medium-temperature hot water in winter (e.g., 45 / 40°C); and the water operation paths of medium-temperature chilled water in summer, medium-temperature chilled water in transition season, and medium-temperature hot water in winter are the same as the operation path of medium-temperature chilled water in summer in the inner zone in Example 2, and are not described in detail here;

[0143] The supply and return water temperature of the water pipe in the outer zone: low-temperature chilled water in summer (e.g., 7 / 12°C), low-temperature hot water in transition season (e.g., 35 / 30°C), and medium-temperature hot water in winter (e.g., 45 / 40°C); the water running paths of low-temperature chilled water in summer and medium-temperature hot water in winter are the same as the running path of ① low-temperature chilled water in summer in the outer zone in Example 2, which will not be described in detail here; the water running path of low-temperature hot water in transition season is the same as the running path of ② low-temperature hot water in transition season in the outer zone in Example 3, which will not be described in detail here;

[0144] Example 6

[0145] For the process air conditioning system, the system diagram of this embodiment is the same as that of Embodiment 3, that is, the connected fresh air unit B, air conditioning unit C, and fan coil unit D are the same, but the working conditions are different;

[0146] In this embodiment, the fresh air unit B and the air conditioning unit C adopt four-pipe fresh air / air conditioning units, and the fan coil unit D adopts a two-pipe fan coil unit and is connected to the inner zone main pipe.

[0147] The supply and return water temperatures of the inner zone water pipes are: low-temperature chilled water in summer (e.g. 7 / 12°C), low-temperature chilled water in transitional seasons (e.g. 7 / 12°C), and medium-temperature hot water in winter (e.g. 45 / 40°C); and the operation paths of low-temperature chilled water in summer, low-temperature chilled water in transitional seasons, and medium-temperature hot water in winter are the same as ① summer cooling path in Example 2, and will not be repeated here.

[0148] The supply and return water temperature of the water pipe in the outer zone: low-temperature hot water in summer (e.g., 35 / 30°C), low-temperature hot water in transition season (e.g., 35 / 30°C), and medium-temperature hot water in winter (e.g., 45 / 40°C); the operation paths of low-temperature hot water in summer and low-temperature hot water in transition season are the same as the low-temperature hot water path in transition season of the outer zone ② in Example 3, which will not be described in detail here; the operation path of medium-temperature hot water in winter is the same as the low-temperature chilled water path in summer of the outer zone ① in Example 2, which will not be described in detail here;

[0149] In Examples 2-6, the inner zone coil used can be the inner zone coil of the fresh air unit B, the air conditioning unit C, and the fan coil D; the outer zone coil can be the outer zone coil of the fresh air unit B, the air conditioning unit C, and the fan coil D, and the specific selection depends on the specific situation.

[0150] It should be noted that in the above embodiments, the description of each embodiment has its own focus. For the parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments; at the same time, the principles or motion paths that are not described in detail are well known to those skilled in the art and will not be described in detail.

[0151] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0152] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A zoned two-pipe evaporative heat pump cooling and heating system, characterized in that: It includes heat recovery type evaporative cooling and heat pump A, external zone dry pipe group, and internal zone dry pipe group; The chilled water outlet and return pipes of the heat recovery evaporative cooling and heat pump A are connected to the inner zone main pipe group and the outer zone main pipe group to supply cooling and heating to the inner and outer zones; The hot water outlet and return pipes of the heat recovery evaporative heat pump A are connected to the inner zone main pipe group and the outer zone main pipe group to supply cooling and heating to the inner and outer zones; The heat recovery type evaporative cooling heat pump A comprises an evaporative cooling heat exchanger (13), a plate heat exchanger (14), and a first water pump (15); the evaporative cooling heat exchanger (13) is connected to the water inlet and outlet pipes of the primary side of the plate heat exchanger (14); and the water inlet and outlet pipes of the secondary side of the plate heat exchanger (14) are connected to the outer zone dry pipe group and the inner zone dry pipe group; The water outlet of the first water pump (15) is connected to the water inlet pipe of the primary side of the plate heat exchanger (14) so ​​as to transport cooling water to the plate heat exchanger (14) for heat exchange or return to the evaporative heat exchanger (13); The heat recovery type evaporative heat pump A further comprises an air-cooled heat exchanger (26), a water-cooled heat exchanger (27), a compressor (28), and a reversing valve (29) connected by pipelines; the inlet end of the air-cooled heat exchanger (26) is connected to the refrigerant pipe (19) of the evaporative heat exchanger (13); the outlet end of the air-cooled heat exchanger (26) is divided into two paths, which are respectively connected to the first port of the reversing valve (29) and the compressor (28) pipeline; The outlet end of the primary side of the water-cooled heat exchanger (27) is connected to the second port of the reversing valve (29), and the inlet end is connected to the refrigerant pipe (19) of the evaporative heat exchanger (13); the water outlet end and the water inlet end of the secondary side of the water-cooled heat exchanger (27) are both connected to the outer zone dry pipe group and the inner zone dry pipe group; the compressor (28) is connected to the third port of the reversing valve (29); The fourth port of the reversing valve (29) is connected to the refrigerant pipe (19) of the evaporative heat exchanger (13).

2. A zoned two-pipe evaporative heat pump cooling and heating system according to claim 1, characterized in that: An expansion valve (31) is provided at the inlet end of the water-cooled heat exchanger (27).

3. The zoned two-pipe evaporative heat pump cooling and heating system according to claim 1 is characterized in that: The external area main pipe group comprises an external area water supply main pipe (1) and an external area water return main pipe (2); The inner zone main pipe group comprises an inner zone water supply main pipe (3) and an inner zone water return main pipe (4); The chilled water outlet pipe of the heat recovery type evaporative heat pump A is divided into two paths, one of which is connected to the outer zone water supply main pipe (1) and is provided with a first valve (5), and the other of which is connected to the inner zone water supply main pipe (3) and is provided with a second valve (6); The chilled water return pipe of the heat recovery type evaporative heat pump A is divided into two paths, one of which is connected to the outer zone return water main pipe (2) and is provided with a third valve (7), and the other of which is connected to the inner zone return water main pipe (4) and is provided with a fourth valve (8); The hot water outlet pipe of the heat recovery type evaporative heat pump A is divided into two paths, one of which is connected to the outer zone water supply main pipe (1) and is provided with a fifth valve (9), and the other of which is connected to the inner zone water supply main pipe (3) and is provided with a sixth valve (10); The hot water return pipe of the heat recovery type evaporative heat pump A is divided into two paths, one of which is connected to the outer zone return main pipe (2) and is provided with a seventh valve (11), and the other of which is connected to the inner zone return main pipe (4) and is provided with an eighth valve (12).

4. The zoned two-pipe evaporative heat pump cooling and heating system according to claim 3 is characterized in that: It also includes fresh air unit B and air conditioning unit C; The fresh air unit B and the air conditioning unit C are each provided with an outer zone coil (32) and an inner zone coil (33); The two ends of the outer zone coil (32) are respectively connected to the outer zone water supply main pipe (1) and the outer zone water return main pipe (2), and the two ends of the inner zone coil (33) are respectively connected to the inner zone water supply main pipe (3) and the inner zone water return main pipe (4).

5. The zoned two-pipe evaporative heat pump cooling and heating system according to claim 4 is characterized in that: It also includes two fan coil units D, one of the fan coil units D having an outer zone coil unit (32) therein for serving an outer zone, and the other fan coil unit D having an inner zone coil unit (33) therein for serving an inner zone; The two ends of the outer zone coil (32) are respectively connected to the outer zone water supply main pipe (1) and the outer zone water return main pipe (2), and the two ends of the inner zone coil (33) are respectively connected to the inner zone water supply main pipe (3) and the inner zone water return main pipe (4).

6. The zoned two-pipe evaporative heat pump cooling and heating system according to claim 3 is characterized in that: The evaporative heat exchanger (13) further comprises a spray pipe (16), a fan (17), and a water receiving tray (18) located in the shell of the evaporative heat exchanger; The spray pipe (16) is located above the refrigerant pipe (19) to spray cooling water onto the refrigerant pipe (19) to form a water film, the water receiving pan (18) is located below the water film, and the first water pump (15) is used to transport the cooling water in the water receiving pan (18) to the plate heat exchanger (14) to perform heat exchange with water from the demand side of the second water pump (20) in the plate heat exchanger (14); The fan (17) is used to discharge evaporated water vapor out of the housing; The spray pipe (16) is provided with a tenth valve (21), and the pipeline where the tenth valve (21) is located is provided with two branches extending out of the evaporative heat exchanger (13), and the two branches are respectively connected to the inlet and outlet of the primary side of the plate heat exchanger (14).

7. The zoned two-pipe evaporative heat pump cooling and heating system according to claim 6 is characterized in that: The shell of the evaporative heat exchanger (13) is also provided with a first air inlet (24), and the first air inlet (24) is opposite to the water film and is used to blow air toward the water film for heat exchange.

8. A cooling and heating method for a zoned two-pipe evaporative cooling and heating pump cooling and heating system, applied to a zoned two-pipe evaporative cooling and heating pump cooling and heating system as claimed in any one of claims 3 to 7, characterized in that: The steps include: Step 1: Divide the air into zones according to the air treatment process, and the same treatment process is classified into the same zone; Step 2: According to the energy demand of different seasons and buildings, the required water temperature in the corresponding zone is determined, and then variable water temperature operation is performed; Among them, variable water temperature operation is achieved by adjusting the operating conditions of the heat recovery evaporative heat pump A and coordinating the switching of valves on the outer zone main pipe group and the inner zone main pipe group.

9. The cooling and heating method of a zoned two-pipe evaporative cooling and heating pump cooling and heating system according to claim 8, characterized in that: In step 1, the air treatment process is divided into three treatment processes: cooling, heating, and cooling first and then heating; When zoning, it is divided into external zone and internal zone, and the fresh air unit B, air conditioning unit C, and fan coil unit D are connected according to the scene requirements to provide cooling and heating.

10. The cooling and heating method of a zoned two-pipe evaporative cooling and heating pump cooling and heating system according to claim 8, characterized in that: The valves on the outer zone main pipe group and the inner zone main pipe group are the first valve (5), the second valve (6), the third valve (7), the fourth valve (8), the fifth valve (9), the sixth valve (10), the seventh valve (11), and the eighth valve (12).

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