CN114111104A - Multi-split system - Google Patents

Multi-split system Download PDF

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Publication number
CN114111104A
CN114111104A CN202111362911.5A CN202111362911A CN114111104A CN 114111104 A CN114111104 A CN 114111104A CN 202111362911 A CN202111362911 A CN 202111362911A CN 114111104 A CN114111104 A CN 114111104A
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CN
China
Prior art keywords
water
temperature
heat pump
heat
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111362911.5A
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Chinese (zh)
Inventor
梁爱云
宋振兴
卢宪晓
贾庆磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Original Assignee
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Hisense Hitachi Air Conditioning System Co Ltd filed Critical Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority to CN202111362911.5A priority Critical patent/CN114111104A/en
Publication of CN114111104A publication Critical patent/CN114111104A/en
Priority to PCT/CN2022/099951 priority patent/WO2023087700A1/en
Priority to CN202280039424.1A priority patent/CN117413151A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/02Heat pumps of the compression type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/06Heat pumps characterised by the source of low potential heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/26Disposition of valves, e.g. of on-off valves or flow control valves of fluid flow reversing valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention relates to a multi-split system which comprises a water source multi-split machine, wherein the water source multi-split machine is provided with a first heat exchange unit, and the first heat exchange unit is provided with a first water inlet and a first water outlet; further comprising: the heat pump unit is provided with a second heat exchange unit, and the second heat exchange unit is provided with a second water inlet and a second water outlet; a water tank having a first water supply port communicated with the first water inlet, a first water return port communicated with the first water outlet, a second water supply port communicated with the second water inlet, and a second water return port communicated with the second water outlet; a control unit configured to: when the water source multi-connected unit is in heat running, the action of the heat pump unit is controlled according to the water inlet temperature at the first water inlet, so that the water temperature in the water tank is maintained within a preset temperature range. The invention is used for solving the problems of poor heat supplementing effect, high manufacturing cost and poor energy saving effect brought by the existing heat supplementing mode.

Description

Multi-split system
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a multi-split air conditioner system.
Background
The multi-split system in the market is generally divided into an air source multi-split system and a water source multi-split system. Compared with an air source multiple on-line system, the water source multiple on-line system has higher energy efficiency ratio, more occupied area, lower operation noise and vibration and more stable and excellent performance, so that the water source multiple on-line system is gradually favored by people, wherein water is taken as a heat exchange medium at the outdoor side of the water source multiple on-line system.
When the water source multi-connected unit heats in winter, the operating temperature range of the water source multi-connected unit is 10-45 ℃, and the high-efficiency area is 15-30 ℃. When the circulating water temperature is lower in winter (for example, about 5-15 ℃), after circulation, the inlet water temperature of the water source multi-connected unit is lower and lower, and may be lower than 10 ℃, and at this time, the water source multi-connected unit is stopped and cannot work, so that a heat compensation design is provided in engineering application.
At present, two main ways of heat compensation are available: firstly, the boiler is matched for heat compensation to ensure the operating water temperature, but the scheme has higher construction cost, large occupied space and poor energy saving and environmental protection performance; and secondly, the air cooling module is adopted for heat supplement, the manufacturing cost of the air cooling module is low, but the lowest water outlet temperature of the air cooling module is 35 ℃, the temperature of the air cooling module deviates from the high-efficiency area of the water source machine too much, the heat supplement effect is poor, and the operation efficiency of the water source multi-split air-conditioning system is influenced.
Disclosure of Invention
The invention aims to provide a multi-split system which is used for solving the problems of poor heat compensation effect, high manufacturing cost and poor energy-saving effect brought by the existing heat compensation mode.
In order to solve the technical problems, the invention provides the following technical scheme for solving the problems:
a multi-split system comprises a water source multi-split machine, wherein the water source multi-split machine is provided with a first heat exchange unit, and the first heat exchange unit is provided with a first water inlet and a first water outlet; characterized in that, the many online systems still includes:
the heat pump unit is provided with a second heat exchange unit, and the second heat exchange unit is provided with a second water inlet and a second water outlet;
a water tank having a first water supply port communicating with the first water inlet port, a first water return port communicating with the first water outlet port, a second water supply port communicating with the second water inlet port, and a second water return port communicating with the second water outlet port;
a control unit configured to: when the water source multi-connected heat pump works, the action of the heat pump unit is controlled according to the water inlet temperature at the first water inlet, so that the water temperature in the water tank is maintained within a preset temperature range.
In some embodiments of the present application, the multi-split system includes:
a first temperature sensor for detecting a temperature Tr of water in the water tank;
and the second temperature sensor is used for detecting the water inlet temperature Ti at the first water inlet.
In some embodiments of the present application, when the water source multi-connected heat pump system is operated, according to the temperature Ti of intaking, control heat pump set's action makes temperature Tr maintains in predetermineeing temperature range, specifically is:
when the inlet water temperature Ti meets a first temperature range, the heat pump unit is closed, otherwise, the heat pump unit is opened;
and when the water temperature Tr is larger than the upper limit value of the preset temperature range, the heat pump unit is closed, and when the water temperature Tr is smaller than the lower limit value of the preset temperature range, the heat pump unit is opened.
In some embodiments of the present application, the predetermined temperature range is set to a range [20 ℃, 25 ℃ ].
In some embodiments of the present application, the first temperature range is the range [20 ℃, T ], where T is the highest water source temperature at which the water source machine heats.
In some embodiments of the present application, the heat pump unit further includes a hot water compressor, a four-way valve, a throttling element, a heat exchanger, and the second heat exchange unit, which are connected to each other through a connecting line.
In some embodiments of the present application, the second heat exchange unit is a plate heat exchanger, a double-tube heat exchanger, or a shell-and-tube heat exchanger.
In some embodiments of the present application, the heat pump unit further comprises:
an economizer having a first port connected to an outflow side of the second heat exchange unit, a second port connected to an inflow side of the heat exchanger, a third port connected to a branch of a flow path between the second port and the inflow side, and a fourth port connected to an air supply port of the hot water compressor;
wherein a throttle element is connected to the branch.
Compared with the prior art, the multi-split system provided by the invention has the following advantages and beneficial effects:
(1) the heat pump unit and the water tank provide required media for the water source multi-connected unit, water in the water tank can provide a stable heat supplementing water source for the water source multi-connected unit, the heat pump unit ensures the inlet water temperature of the water tank and the water source multi-connected unit, ensures the reliable operation of the water source multi-connected unit and improves the use experience of users;
(2) the heat pump unit and the water source multi-connected unit realize linkage control, ensure timely realization of the heat supplementing effect of the water source multi-connected unit and reduce energy consumption;
(3) the water tank and the heat pump unit are additionally arranged, so that the occupied space is small, and the manufacturing cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art will be briefly described below, and it is obvious that the drawings described below are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a structural diagram of an embodiment of a multi-split system according to the present invention;
FIG. 2 is a schematic block diagram of a heat pump unit in an embodiment of a multi-split air-conditioning system provided by the invention;
fig. 3 is a flowchart illustrating the operation of an embodiment of the multi-split system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed 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 that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In order to ensure reliable operation of a water source multi-split air conditioner (hereinafter referred to as a water source unit), the present application relates to a multi-split air conditioner system, referring to fig. 1.
The multi-split system comprises a water source machine 10, a heat pump unit 30, a water tank 20 and a control unit.
Water source machine
The water source unit 10 includes an outdoor refrigerant system unit (not shown), an indoor unit (not shown), and a first heat exchange unit (not shown).
The outdoor unit refrigerant system unit comprises a compressor, an oil separator, a four-way valve, a gas-liquid separator, a throttling component and two stop valves.
The compressor is connected with the oil separator and the gas-liquid separator respectively.
Four ports of the four-way valve are respectively connected with the oil separator, the gas-liquid separator, the stop valve and the heat exchange unit, so that a loop for flowing of the refrigerant is formed, and heat exchange can be realized through compression, condensation, throttling and evaporation of the refrigerant.
The process of achieving heat exchange as described above is well known to those skilled in the art and will not be described in detail herein.
The throttling component is connected with the heat exchange unit and the other stop valve. Both the stop valves are connected with the indoor unit.
The working principle and process of the indoor unit are the same as those of the indoor unit in the common multi-split air conditioner, and are not described in detail herein.
The first heat exchange unit is provided with four ports which are respectively a first water inlet A, a first water outlet B, a compressor interface and an indoor unit interface, and heat released by a refrigerant flowing through the first heat exchange unit can be absorbed by cooling water flowing through the first heat exchange unit, so that heat exchange between the refrigerant and the cooling water is realized.
The first heat exchange unit can be a plate heat exchanger, a double-pipe heat exchanger, a shell-and-tube heat exchanger or the like.
Heat pump set
The heat pump unit 30 carries the water tank 20 to provide a stable heat supplementing water source for the water source unit 10, so as to ensure the reliable operation of the water source unit 10.
The heat pump unit 30 has a second heat exchange unit having the same structure as the first heat exchange unit, and also has a second water inlet C, a second water outlet D, a compressor interface, and an indoor unit interface.
The structure of the second heat exchange unit is the same as that of the first heat exchange unit, and the second heat exchange unit can be a plate heat exchanger, a double-pipe heat exchanger, a shell-and-tube heat exchanger and the like.
In the present application, the selected heat pump unit 30 is an air source heat pump unit capable of producing hot water all year around, and carries the water tank 20 to supply hot water when it is used.
Referring to fig. 2, a schematic block diagram of a heat pump unit 30 is shown.
The heat pump unit 30 includes a hot water compressor 31, a four-way valve 32, a throttle element 39, a heat exchanger 34, and a second heat exchange unit 35, which are connected to each other by a connection line.
The hot water compressor 31 has an ultra-wide operation range, so that the unit can be operated for heating all the year round (the environment temperature is minus 26 ℃ to 48 ℃), and the hot water range can be 20 ℃ to 55 ℃.
The heat exchanger 34 in the present application is selected as a fin heat exchanger and the second heat exchange unit 35 is selected as a double pipe heat exchanger.
In addition, in order to improve the heating capacity of the heat pump unit 30 at low temperature, the heat pump unit 30 further includes an economizer 37.
Referring to fig. 2, the economizer 37 has a first port, a second port, a third port and a fourth port.
The first port is connected to the outflow side of the second heat exchange unit 35, the second port is connected to the inflow side of the heat exchanger 34, the third port is connected to a branch of a flow path between the second port and the inflow side of the heat exchanger 34 via a throttle element 38 (e.g., an electronic expansion valve), and the fourth port is connected to an air supply port of the hot water compressor 31, thereby supplying an air supply amount to the hot water compressor 31 at appropriate times.
When the hot water compressor 31 operates, after the hot water compressor 31 compresses the refrigerant, the refrigerant passes through the four-way valve 32 and enters the refrigerant side of the second heat exchange unit 35 to be condensed, and the refrigerant is condensed and released in the second heat exchange unit 35 to exchange heat with water in the water tank 20.
The condensed liquid refrigerant passes through the economizer 37, and a portion of the condensed liquid refrigerant enters the heat exchanger 34, the filter 39' and the throttling element 39 to be throttled and decompressed, and is evaporated in the heat exchanger 34, and then passes through the four-way valve 32 to enter the gas-liquid separator 33, and finally returns to the suction port of the hot water compressor 31.
The other part of the refrigerant passing through the economizer 37 enters the economizer 37 again through a throttle element 38 (e.g., an electronic expansion valve) to exchange heat, and then flows out to the air supply port of the hot water compressor 31 from the fourth port.
In this way, the hot water unit 30 can provide stable and continuous heat to the water tank 20, so that the water tank 20 can provide a stable hot water supply for the water supply device 10.
The hot water range of the heat pump unit 30 can be from 20 ℃ to 55 ℃, so that the preset temperature range of the water tank 20 can be set to be 20 ℃ to 25 ℃.
In addition, the high-efficiency area of the water source machine 10 is located at 15-30 ℃, so that the low-temperature hot water of the heat pump unit 30 (and the water tank 20 thereof) can just meet the requirement of the water source machine 10 on water temperature in winter, the heating effect of the water source machine 10 can be improved, and meanwhile, the energy consumption of the water source machine 10 is reduced.
The water tank 20 has a first water supply port, a second water supply port, a first return port, and a second return port.
The first water supply port is communicated with a first water inlet A of the first heat exchange unit, the first water return port is communicated with a first water outlet B of the first heat exchange unit, the second water supply port is communicated with a second water inlet C of a second heat exchange unit of the heat pump unit 30, and the second water return port is communicated with a second water outlet D of the second heat exchange unit of the heat pump unit 30.
The water tank 20 is used as an intermediate water storage device for the heat pump unit 30 and the water source unit 10, and can exchange heat with a second heat exchange unit in the heat pump unit 30 and a first heat exchange unit of the water source unit 10 respectively, so that heat generated by the heat pump unit 30 is exchanged to the water tank 20, and water temperature Tr and water flow in the water tank 20 are stable, thereby providing a stable and continuous heat supplementing water source for the water source unit 10 and improving the operation reliability of the water source unit 10.
Referring to fig. 3, the coordinated control of the heat pump unit 30 and the water source unit 10, which is performed by the control unit, will be described as follows.
S1: the water source machine operates.
S2: and judging the operation mode of the water source machine 10, if the water source machine is in heating operation, proceeding to S3, and if the water source machine is in cooling operation, closing the heat pump unit 30.
S3: and judging whether the inlet water temperature Ti at the first water inlet A meets the first temperature range, if so, going to S4, and if not, going to S6.
And a temperature sensor is arranged at the first water inlet A and is used for detecting the water inlet temperature Ti at the first water inlet A.
The lower limit value of the first temperature range may be set to 20 c, which may be the same as the lower limit value of the preset temperature range of the temperature of the water in the water tank 20.
For example, the first temperature range is [20 ℃, T ], where T is the maximum water source temperature for heating the water source machine, e.g., T =45 ℃, and the maximum water source temperature may vary from water source machine to water source machine.
S4: the heat pump unit 30 is turned off and proceeds to S5.
When the water source unit 10 is in a cooling operation, the water tank 20 is not required to provide a heat source, and thus, the heat pump unit 30 is turned off.
When the inlet water temperature Ti at the first water inlet a satisfies [20 ℃, + ∞ ], it indicates that the inlet water temperature Ti meets the requirement, and the water temperature Tr in the water tank 20 also satisfies [20 ℃, T ], so that the heat pump unit 30 is also turned off at this time in order to save energy consumption.
Note that a temperature sensor is provided in the water tank 20 to acquire the water temperature Tr in the water tank 20.
And S5, monitoring the water temperature Tr in the water tank 20 in real time.
In the process of closing the heat pump unit 30, the water temperature Tr in the water tank 20 is monitored in real time.
If it is monitored that the water temperature Tr in the water tank 20 is smaller than the lower limit value of the preset temperature range, the heat pump unit 30 is started to ensure that the water tank 20 can provide a stable heat supplementing water source for the water source unit 10.
Afterwards, in the process of starting the heat pump unit 30, if the water temperature Tr in the water tank 20 is monitored to be larger than the upper limit value of the preset temperature range, the heat pump unit 30 is turned off, and energy consumption is saved.
In the process of starting the heat pump unit 30, if it is monitored that the water temperature Tr in the water tank 20 is smaller than the upper limit value of the preset temperature range, the heat pump unit 30 is kept started.
If the water temperature Tr in the water tank 20 is continuously monitored to be greater than the lower limit value of the preset temperature range, the current state of the heat pump unit 30 is maintained (i.e., turned off).
Monitoring of the water temperature Tr in the tank 20 is performed to ensure that the water temperature Tr is maintained within a predetermined temperature range.
S6: the heat pump unit 30 is turned on and proceeds to S7.
When the inlet water temperature Ti at the first water inlet a does not satisfy [20 ℃, + ∞ ], it indicates that the inlet water temperature Ti is low and is not satisfactory, and the water temperature in the water tank 20 is not enough to provide heat supplementing energy for the water source machine 10, and at this time, the heat pump unit 30 needs to be started.
S7: the water temperature Tr in the water tank 20 is monitored in real time.
When the heat pump unit 30 is turned on, the water temperature Tr in the water tank 20 is monitored in real time.
If the water temperature Tr in the water tank 20 is monitored to be larger than the upper limit value of the preset temperature range, the heat pump unit 30 is turned off, and energy consumption is saved.
Thereafter, in the process of shutting down the heat pump unit 30, if it is monitored that the water temperature Tr in the water tank 20 is smaller than the lower limit value of the preset temperature range, the heat pump unit 30 is turned on to ensure that heat energy is provided for the water tank 20.
In the process of shutting down the heat pump unit 30, if it is monitored that the water temperature Tr in the water tank 20 is greater than the lower limit value of the preset temperature range, the heat pump unit 30 is kept on.
If the water temperature Tr in the water tank 20 is continuously monitored to be smaller than the upper limit value of the preset temperature range, the current state of the heat pump unit 30 is maintained (i.e., turned on).
Monitoring of the water temperature Tr in the tank 20 is performed to ensure that the water temperature Tr is maintained within a predetermined temperature range.
Carry on water tank 20 through heat pump set 30, for water source machine 10 provides stable and reliable concurrent heating water source, avoid water source machine 10 to shut down because of the temperature of intaking Ti is lower frequently, improve water source machine 10 operational reliability.
The heat pump unit 30 and the water tank 20 for low-temperature heating have low manufacturing cost and small occupied space, the input cost is reduced, and the arrangement flexibility is improved.
The action of the heat pump unit 30 is controlled by the water inlet temperature Ti of the water source machine 10, so that the water temperature Tr in the water tank 20 is maintained within a preset temperature range, a stable heat supplementing water source is provided for the water source machine 10, and the control logic is simple and easy to implement.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A multi-split system comprises a water source multi-split machine, wherein the water source multi-split machine is provided with a first heat exchange unit, and the first heat exchange unit is provided with a first water inlet and a first water outlet; characterized in that, the many online systems still includes:
the heat pump unit is provided with a second heat exchange unit, and the second heat exchange unit is provided with a second water inlet and a second water outlet;
a water tank having a first water supply port communicating with the first water inlet port, a first water return port communicating with the first water outlet port, a second water supply port communicating with the second water inlet port, and a second water return port communicating with the second water outlet port;
a control unit configured to: when the water source multi-connected heat pump works, the action of the heat pump unit is controlled according to the water inlet temperature at the first water inlet, so that the water temperature in the water tank is maintained within a preset temperature range.
2. The multi-split system as claimed in claim 1, wherein the multi-split system comprises:
a first temperature sensor for detecting a temperature Tr of water in the water tank;
and the second temperature sensor is used for detecting the water inlet temperature Ti at the first water inlet.
3. The multi-split system as claimed in claim 2, wherein when the water source multi-split system is operated in a heating mode, the action of the heat pump unit is controlled according to the inlet water temperature Ti, so that the water temperature Tr is maintained within a preset temperature range, specifically:
when the inlet water temperature Ti meets a first temperature range, the heat pump unit is closed, otherwise, the heat pump unit is opened;
and when the water temperature Tr is larger than the upper limit value of the preset temperature range, the heat pump unit is closed, and when the water temperature Tr is smaller than the lower limit value of the preset temperature range, the heat pump unit is opened.
4. A multi-split system as claimed in claim 3, wherein the preset temperature range is set to a range [20 ℃, 25 ℃ ].
5. A multi-split system as claimed in claim 3, wherein the first temperature range is a range [20 ℃, T ], where T is a maximum water source temperature for heating of the water source machine.
6. A multi-split system as claimed in claim 1, wherein the heat pump unit further comprises a hot water compressor, a four-way valve, a throttling element, a heat exchanger and the second heat exchanging unit which are connected through a connecting pipe.
7. The multi-split system as claimed in claim 6, wherein the second heat exchange unit is a plate heat exchanger, a double-tube heat exchanger, or a shell-and-tube heat exchanger.
8. A multi-split system as claimed in claim 6, wherein the heat pump unit further comprises:
an economizer having a first port connected to an outflow side of the second heat exchange unit, a second port connected to an inflow side of the heat exchanger, a third port connected to a branch of a flow path between the second port and the inflow side, and a fourth port connected to an air supply port of the hot water compressor;
wherein a throttle element is connected to the branch.
CN202111362911.5A 2021-11-17 2021-11-17 Multi-split system Pending CN114111104A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202111362911.5A CN114111104A (en) 2021-11-17 2021-11-17 Multi-split system
PCT/CN2022/099951 WO2023087700A1 (en) 2021-11-17 2022-06-20 Multi-connected system and control method thereof
CN202280039424.1A CN117413151A (en) 2021-11-17 2022-06-20 Multi-split system and control method thereof

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Application Number Priority Date Filing Date Title
CN202111362911.5A CN114111104A (en) 2021-11-17 2021-11-17 Multi-split system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023087700A1 (en) * 2021-11-17 2023-05-25 青岛海信日立空调系统有限公司 Multi-connected system and control method thereof

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CN205939465U (en) * 2016-08-19 2017-02-08 广东美的暖通设备有限公司 Multi -split air conditioning system
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Application publication date: 20220301