Air conditioner hot water integrated system with temperature control dehumidification function and control method thereof

Abstract

The application provides an air conditioner and hot water integrated system with temperature control and dehumidification functions and a control method thereof. The integrated system comprises a compressor, an outdoor heat exchanger, a first indoor heat exchanger, a second indoor heat exchanger, a refrigerant-water heat exchanger and a four-way valve. The exhaust end of the compressor is connected to one end of the refrigerant-water heat exchanger. The other end of the refrigerant-water heat exchanger is connected to one end of the outdoor heat exchanger or one end of the second indoor heat exchanger. The four-way valve is only one. The first D end is connected to the other end of the refrigerant-water heat exchanger through a first pipeline. The first E end is connected to one end of the second indoor heat exchanger through a second pipeline. The first S end is connected to the suction end of the compressor through a third pipeline. The first C end is connected to one end of the outdoor heat exchanger through a fourth pipeline. According to the application, the modes of refrigeration + hot water, heating + hot water and dehumidification + hot water can be realized at the same time. Only one four-way valve is needed, the cost is reduced, and the structure is more compact.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically to an integrated air conditioning and hot water system with temperature control and dehumidification functions, and its control method. Background Technology

[0002] Residential inverter air conditioners are now widely used in my country, serving as both cooling and dehumidifiers in summer and heating in winter. To meet dehumidification requirements, the evaporation temperature of the air conditioner is typically lower than the return air dew point temperature; however, to meet comfort requirements, the return air temperature should not be too low. When a residential inverter air conditioner is running under low load cooling, the evaporation temperature is usually higher. To maintain dehumidification, the indoor unit's airflow needs to be reduced to lower the evaporation temperature, thus achieving the purpose of dehumidification. In this case, both the cooling efficiency ratio and the dehumidification capacity per unit energy consumption are reduced.

[0003] In the middle and lower reaches of the Yangtze River and areas south of it, relative humidity is high during the transitional season (when air conditioning is not needed for cooling or heating), especially during the "plum rain season" and the "return to spring" period. Dehumidification is necessary to address the comfort and health issues caused by dampness. When conventional household inverter air conditioners are cooling and dehumidifying during the transitional season, the indoor return air temperature and dew point gradually decrease, and the indoor relative humidity stops decreasing or even increases after reaching a certain level, resulting in a cool but not dry indoor environment. Furthermore, the decrease in evaporation temperature and return air dew point significantly reduces the dehumidification capacity per unit of energy consumed by the air conditioner. Therefore, during humid weather in the transitional season, conventional household inverter air conditioners cannot meet the comfort requirements for dehumidification and are usually idle.

[0004] Summer cooling periods and the transitional season's humid weather periods are both relatively long, resulting in high demands for cooling and dehumidification. Conventional air conditioning systems, when operating in cooling and temperature / dehumidification modes, need to release heat outdoors. Recovering this heat as hot water can meet the household's hot water needs.

[0005] The prior art CN102954621 A discloses an environmental control system that can switch between hot water, cooling, dehumidification and heating, but it achieves the switching of the above functions by setting two four-way valves, resulting in high system cost.

[0006] Because existing household inverter air conditioners cannot simultaneously achieve cooling + hot water production, heating + hot water production, or dehumidification + hot water production modes, and cannot effectively reduce costs, this invention researches and designs an integrated air conditioning and hot water system with temperature control and dehumidification functions, and its control method. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of existing household inverter air conditioners that cannot simultaneously achieve cooling + hot water production, heating + hot water production, and dehumidification + hot water production modes, and cannot effectively reduce costs, thereby providing an integrated air conditioning and hot water system with temperature control and dehumidification functions and its control method.

[0008] To address the above problems, the present invention provides an integrated air conditioning and hot water system with temperature control and dehumidification functions, comprising:

[0009] The system includes a compressor, an outdoor heat exchanger, a first indoor heat exchanger, a second indoor heat exchanger, a refrigerant-water heat exchanger, and a four-way valve. The discharge end of the compressor is connected to one end of the refrigerant-water heat exchanger, and the other end of the refrigerant-water heat exchanger is connected to one end of the outdoor heat exchanger or one end of the second indoor heat exchanger. The other end of the first indoor heat exchanger is connected to the other end of the outdoor heat exchanger, and the suction end of the compressor is connected to one end of the outdoor heat exchanger or one end of the second indoor heat exchanger.

[0010] There is only one four-way valve, which includes a first D end, a first E end, a first S end, and a first C end. The four-way valve can switch between the following two connection states: In the first state, the first D end is connected to the first C end, and the first E end is connected to the first S end; in the second state, the first D end is connected to the first E end, and the first C end is connected to the first S end.

[0011] The first D end is connected to the other end of the refrigerant-water heat exchanger through the first pipe, the first E end is connected to one end of the second indoor heat exchanger through the second pipe, the first S end is connected to the suction end of the compressor through the third pipe, and the first C end is connected to one end of the outdoor heat exchanger through the fourth pipe.

[0012] In some implementations...

[0013] The other end of the outdoor heat exchanger is connected to the other end of the first indoor heat exchanger (41) through the fifth pipeline. The fifth pipeline is equipped with a first throttling device. The first indoor heat exchanger and the second indoor heat exchanger are connected in series, and a second throttling device is also provided between them.

[0014] In some implementations...

[0015] The compressor's exhaust end is connected to one end of the refrigerant-water heat exchanger via a sixth pipeline, and the other end of the refrigerant-water heat exchanger flows out through the first pipeline.

[0016] It also includes a water tank and a water pump. The water tank is connected to the interior of the refrigerant-water heat exchanger through a first water passage and the water tank is connected to the interior of the refrigerant-water heat exchanger through a second water passage, so that water and refrigerant can exchange heat in the refrigerant-water heat exchanger to produce hot water. A water pump is provided on the first water passage and / or the second water passage.

[0017] In some implementations...

[0018] It also includes an indoor fan and an outdoor fan, the outdoor fan being opposite to the outdoor heat exchanger to drive airflow to exchange heat with the refrigerant in the outdoor heat exchanger, the indoor fan being opposite to at least a portion of the structure of the first indoor heat exchanger, and the indoor fan also being opposite to at least a portion of the structure of the second indoor heat exchanger to drive airflow to exchange heat with the refrigerant in the first indoor heat exchanger and the second indoor heat exchanger.

[0019] In some implementations...

[0020] It also includes an auxiliary compression cylinder, a liquid storage device, a seventh pipeline, and an eighth pipeline. The intake end of the auxiliary compression cylinder is connected to the upper interior of the liquid storage device through the seventh pipeline, and the exhaust end of the auxiliary compression cylinder is connected to the sixth pipeline through the eighth pipeline. The other end of the outdoor heat exchanger is connected to the bottom interior of the liquid storage device, and the other end of the first indoor heat exchanger is connected to the bottom interior of the liquid storage device.

[0021] In some implementations...

[0022] The first indoor heat exchanger, the second indoor heat exchanger, the first throttling device, and the second throttling device constitute at least a portion of the structure of a set of indoor unit units, wherein there are multiple indoor unit units, and the multiple indoor unit units are connected in parallel to each other.

[0023] This invention also provides a control method for an integrated air conditioning and hot water system with temperature control and dehumidification functions as described above, wherein: when the integrated air conditioning and hot water system with temperature control and dehumidification functions simultaneously includes a four-way valve, a first throttling device, a second throttling device, an indoor fan, an outdoor fan, and a water pump, the control method includes:

[0024] Testing steps, and the required operating modes of the testing system;

[0025] The judgment step is to determine which of the following operating modes is required: cooling mode, heating mode, dehumidification mode, cooling + hot water mode, heating + hot water mode, and dehumidification + hot water mode.

[0026] The control steps include controlling the switching of the four-way valve, controlling the on / off state of the first and second throttling devices and adjusting their opening degree, controlling the opening and closing of the indoor and outdoor fans, and controlling the opening and closing of the water pump, according to the requirements of different operating modes.

[0027] In some implementations...

[0028] In the control steps, when the required operating mode of the system is cooling mode, the four-way valve is controlled to connect the first D end with the first C end and the first E end with the first S end. The first throttling device is controlled to open and its opening degree is controlled to change. The second throttling device is fully opened. The outdoor fan and the indoor fan are both controlled to run. The water pump is controlled to shut down.

[0029] When the system requires a heating mode, the four-way valve is controlled to connect the first D end to the first E end and the first C end to the first S end. The first throttling device is controlled to open and its opening degree is controlled to change. The second throttling device is fully open, and both the outdoor fan and the indoor fan are controlled to run. The water pump is controlled to shut down.

[0030] When the required operating mode of the system is temperature control and dehumidification, the four-way valve is controlled to connect the first D end with the first C end and the first E end with the first S end. The second throttling device is controlled to open and its opening degree is controlled to change. When the first throttling device is fully open, both the outdoor fan and the indoor fan are controlled to run. The water pump is controlled to shut down.

[0031] When the required operating mode of the system is cooling + hot water mode, the four-way valve is controlled to connect the first D end with the first C end and the first E end with the first S end. The first throttling device is controlled to open and its opening degree is controlled to change. The second throttling device is controlled to fully open. The outdoor fan is controlled to turn off. The indoor fan is controlled to run. The water pump is controlled to turn on.

[0032] When the required operating mode of the system is heating + hot water production mode, the four-way valve is controlled to connect the first D end with the first E end, and at the same time the first C end with the first S end. The second throttling device is controlled to be fully open, the first throttling device is opened and its opening degree is controlled to change, the outdoor fan and the indoor fan are both controlled to run, and the water pump is controlled to be turned on.

[0033] In some implementations...

[0034] When in heating + hot water mode

[0035] The detection step also includes detecting the tube temperature of the first indoor heat exchanger;

[0036] When the pipe temperature is less than the preset pipe temperature, the indoor fan is controlled to stop; when the pipe temperature is greater than or equal to the preset pipe temperature, the indoor fan is controlled to run.

[0037] The detection step also includes detecting the water temperature in the water tank;

[0038] When the water temperature is less than the preset water temperature, the speed of the water pump and the speed of the indoor fan are reduced. When the water temperature is greater than or equal to the preset water temperature, the speed of the water pump and the speed of the indoor fan are increased.

[0039] In some implementations...

[0040] When the required operating mode of the system is temperature control and dehumidification + hot water production mode

[0041] Control the four-way valve to connect the first D end with the first C end, and at the same time connect the first E end with the first S end; control the first throttling device to be fully open, control the second throttling device to open and control the opening degree to change, control the outdoor fan to stop, and control the indoor fan to run.

[0042] The detection step also includes detecting the indoor temperature;

[0043] When the indoor temperature minus the preset temperature is less than the first preset value, the pump speed is controlled to be less than the preset speed or the pump is controlled to stop. When the indoor temperature minus the preset temperature is greater than the first preset value, the pump speed is controlled to be greater than or equal to the preset speed.

[0044] In some implementations...

[0045] The judgment step, after determining that it is neither a cooling mode nor a heating mode, then determines whether it is a single hot water mode.

[0046] In the control steps, if it is a single hot water mode, the four-way valve is controlled to connect the first D end with the first E end, and the first C end with the first S end. The second throttling device is fully opened, the first throttling device is opened and its opening degree is changed. The indoor fan is stopped, the outdoor fan is started, and the water pump is turned on.

[0047] The integrated air conditioning and hot water system with temperature control and dehumidification functions and its control method provided by this invention have the following beneficial effects:

[0048] This invention, through a structure comprising a compressor, an outdoor heat exchanger, first and second indoor heat exchangers, a refrigerant-water heat exchanger, and only one four-way valve, and the specific connection method described above, integrates a refrigerant-water heat exchanger into a conventional air conditioning system, organically combining a heat pump water heater and an air conditioning system. It enables multiple operating modes, including cooling, heating, dehumidification, hot water supply, simultaneous cooling and hot water supply, simultaneous heating and hot water supply, and dehumidification + hot water production. Specifically, it can simultaneously achieve cooling + hot water production, heating + hot water production, and dehumidification + hot water production modes. The connection method allows for the series connection of the first and second indoor heat exchangers, providing conditions for dehumidification. Furthermore, only a single four-way valve is needed to switch between cooling, heating, and dehumidification modes, as well as between cooling + hot water production, heating + hot water production, and dehumidification + hot water production modes. Compared to existing technologies that require multiple refrigerant-water heat exchangers, this invention offers significant advantages. Compared to two or more four-way valves, this invention effectively reduces the number of four-way valves required, significantly reducing costs and allowing for a smaller, more compact structure. In multiple operating modes, this invention allows for the sharing or partial sharing of the same heat exchanger and piping system. Compared to simultaneously installing an air conditioner and a heat pump water heater, this saves initial investment and operating costs, and improves overall system efficiency. Furthermore, the air conditioning system of this invention can utilize the condensation heat generated by the refrigeration system to heat water (refrigeration + hot water production mode) and can utilize indoor heat absorbed by dehumidification to produce hot water (dehumidification + hot water production mode). This reduces heat emissions into the environment, lowers thermal pollution, and improves system energy efficiency. This allows an air conditioning system to perform conventional cooling and heating functions, as well as temperature control, dehumidification, and water heater functions simultaneously, effectively reducing equipment costs and downtime. Attached Figure Description

[0049] Figure 1 This is a flow path structure diagram of the integrated air conditioning and hot water system with temperature control and dehumidification functions of the present invention in cooling mode;

[0050] Figure 2 This is a flow path structure diagram of the air conditioning and hot water integrated system with temperature control and dehumidification function of the present invention in heating mode;

[0051] Figure 3 This is a flow path structure diagram of the integrated air conditioning and hot water system with temperature control and dehumidification function of the present invention in the temperature control and dehumidification mode;

[0052] Figure 4 This is a flow path structure diagram of the integrated air conditioning and hot water system with temperature control and dehumidification functions of the present invention in single hot water mode;

[0053] Figure 5 This is a flow path structure diagram of the air conditioning and hot water integrated system with temperature control and dehumidification functions of the present invention in the cooling + hot water production mode;

[0054] Figure 6 This is a flow path structure diagram of the air conditioning and hot water integrated system with temperature control and dehumidification functions of the present invention in the heating + hot water mode;

[0055] Figure 7 This is a flow path structure diagram of the air conditioning and hot water integrated system with temperature control and dehumidification function of the present invention in the temperature control and dehumidification + hot water production mode;

[0056] Figure 8 This is a system structure diagram of an alternative embodiment 1 of the air conditioning and hot water integrated system with temperature control and dehumidification functions of the present invention;

[0057] Figure 9 This is a system structure diagram of an alternative embodiment 2 of the air conditioning and hot water integrated system with temperature control and dehumidification functions of the present invention.

[0058] The reference numerals in the attached figures are as follows:

[0059] 1. Compressor; 12. Auxiliary compression cylinder; 2. Four-way valve; C, first C end; D, first D end; E, first E end; S, first S end; 3. Outdoor heat exchanger; 41. First indoor heat exchanger; 42. Second indoor heat exchanger; 51. First throttling device; 52. Second throttling device; 61. Outdoor fan; 62. Indoor fan; 7. Refrigerant-water heat exchanger; 71. Heat exchanger water outlet; 72. Heat exchanger water inlet; 73. Heat exchanger refrigerant inlet 74. Heat exchanger refrigerant outlet; 8. Water tank; 81. Water tank inlet; 82. Water tank outlet; 83. Water tank supply outlet; 84. Water tank return outlet; 9. Water pump; 10. Liquid storage device; 101. First pipeline; 102. Second pipeline; 103. Third pipeline; 104. Fourth pipeline; 105. Fifth pipeline; 106. Sixth pipeline; 107. Seventh pipeline; 108. Eighth pipeline; 201. First water path; 202. Second water path. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0063] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0064] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0065] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0066] like Figure 1-9 As shown, the present invention provides an integrated air conditioning and hot water system with temperature control and dehumidification functions, comprising:

[0067] The system includes a compressor 1, an outdoor heat exchanger 3, a first indoor heat exchanger 41, a second indoor heat exchanger 42, a refrigerant-water heat exchanger 7, and a four-way valve 2. The discharge end of the compressor 1 is connected to one end of the refrigerant-water heat exchanger 7. The other end of the refrigerant-water heat exchanger 7 is connected to one end of the outdoor heat exchanger 3 or to one end of the second indoor heat exchanger 42. The other end of the second indoor heat exchanger 42 is connected to one end of the first indoor heat exchanger 41. The other end of the first indoor heat exchanger 41 can be connected to the other end of the outdoor heat exchanger 3. The suction end of the compressor 1 can be connected to one end of the outdoor heat exchanger 3 or to one end of the second indoor heat exchanger 42.

[0068] There is only one four-way valve 2. The four-way valve 2 includes a first D end (D), a first E end (E), a first S end (S), and a first C end (C). The four-way valve 2 can switch between the following two connection states: In the first state, the first D end (D) is connected to the first C end (C), and the first E end (E) is connected to the first S end (S); In the second state, the first D end (D) is connected to the first E end (E), and the first C end (C) is connected to the first S end (S).

[0069] The first D end D is connected to the other end of the refrigerant-water heat exchanger 7 through the first pipe 101, the first E end E is connected to one end of the second indoor heat exchanger 42 through the second pipe 102, the first S end S is connected to the suction end of the compressor 1 through the third pipe 103, and the first C end C is connected to one end of the outdoor heat exchanger 3 through the fourth pipe 104.

[0070] This invention, through a structure comprising a compressor, an outdoor heat exchanger, first and second indoor heat exchangers, a refrigerant-water heat exchanger, and only one four-way valve, and the specific connection method described above, integrates a refrigerant-water heat exchanger into a conventional air conditioning system, organically combining a heat pump water heater and an air conditioning system. It enables multiple operating modes, including cooling, heating, dehumidification, hot water supply, simultaneous cooling and hot water supply, simultaneous heating and hot water supply, and dehumidification + hot water production. Specifically, it can simultaneously achieve cooling + hot water production, heating + hot water production, and dehumidification + hot water production modes. The connection method allows for the series connection of the first and second indoor heat exchangers, providing conditions for dehumidification. Furthermore, only one four-way valve is needed to switch between cooling, heating, and dehumidification, as well as between cooling + hot water production, heating + hot water production, and dehumidification + hot water production modes. Compared to existing technologies that require multiple components... Compared to two or more four-way valves, this invention effectively reduces the number of four-way valves required, significantly reducing costs and allowing for a smaller, more compact structure. In multiple operating modes, this invention allows for the sharing or partial sharing of the same heat exchanger and piping system. Compared to simultaneously installing an air conditioner and a heat pump water heater, this saves initial investment and operating costs, and improves overall system efficiency. Furthermore, the air conditioning system of this invention can utilize the condensation heat generated by the refrigeration system to heat water (refrigeration + hot water production mode) and can utilize indoor heat absorbed by dehumidification to produce hot water (dehumidification + hot water production mode). This reduces heat emissions into the environment, lowers thermal pollution, and improves system energy efficiency. This allows an air conditioning system to perform conventional cooling and heating functions, as well as temperature control, dehumidification, and water heater functions simultaneously, effectively reducing equipment costs and downtime.

[0071] To address the issues of high energy consumption for cooling and dehumidification during low-load operation of conventional household inverter air conditioners in summer and low comfort levels during humid transitional seasons, and to recover waste heat emitted from the outside during cooling operation to meet the demand for domestic hot water, this invention provides an air conditioning water heater system with temperature control and dehumidification functions, which can simultaneously meet the functions of cooling, heating, temperature control and dehumidification, and hot water production.

[0072] This invention can solve the following technical problems:

[0073] 1. Solve the problem of low comfort and high energy consumption caused by the excessively low outlet air temperature and evaporation temperature when conventional inverter air conditioners are dehumidified during the transition season in humid regions;

[0074] 2. Solve the problem of heat waste caused by air conditioners releasing heat outdoors during cooling, temperature control, and dehumidification operations;

[0075] 3. An air conditioning system can perform conventional cooling and heating functions, as well as temperature control, dehumidification, and water heater functions, thereby reducing equipment costs and downtime.

[0076] This invention proposes an air conditioning and hot water combined supply system that collects the condensation heat emitted into the environment during air conditioning operation and uses it to heat hot water or other heating equipment. It can realize multiple functions such as cooling, heating, and hot water supply, saving initial investment and operating costs of equipment, improving the overall efficiency of the system, and reducing the heat emitted into the environment, thus reducing thermal pollution.

[0077] The air conditioner of the present invention has only one main four-way valve (four-way valve 2) for switching between different operating modes. The D pipe (first D end) of the four-way valve is connected to the exhaust port of the compressor 1 through the refrigerant-water heat exchanger 7, the S pipe (first S end) is connected to the suction port of the compressor, the E pipe (first E end) is connected to the second indoor heat exchanger 42, and the C pipe (first C end) is connected to the outdoor heat exchanger 3.

[0078] In some implementations...

[0079] The other end of the outdoor heat exchanger 3 is connected to the other end of the first indoor heat exchanger 41 through the fifth pipe 105. The fifth pipe 105 is equipped with a first throttling device 51. The first indoor heat exchanger 41 and the second indoor heat exchanger 42 are connected in series, and a second throttling device 52 is also provided between them.

[0080] The present invention also uses a first throttling device on the fifth pipeline to adjust or shut off the refrigerant flow through or out of the outdoor heat exchanger, thereby effectively controlling the refrigerant flow through the outdoor heat exchanger. The second throttling device between the first and second indoor heat exchangers can be opened and adjusted to throttle the refrigerant when dehumidification is required, thus satisfying the functions and effects of dehumidification and dehumidification + hot water production.

[0081] In the air conditioning system of the present invention, the refrigerant-water heat exchanger 7, through different combinations of the four-way valve 2 and the first throttling device 51 and the second throttling device 52, forms a series or parallel relationship with the outdoor heat exchanger 3, the first indoor heat exchanger 41 and the second indoor heat exchanger 42, which can realize multiple operating modes such as cooling, heating, dehumidification, hot water production, cooling + hot water production, heating + hot water production, dehumidification + hot water production and defrosting, so as to meet the needs of different users.

[0082] The first throttling device 51 and the second throttling device 52 of the present invention are preferably throttling devices with no flow when the valve is closed. When the system needs to switch operating modes, closing this throttling device can cut off the refrigerant operation of this section of the pipeline.

[0083] The air conditioning and hot water system of this invention controls the switching of a four-way valve and multiple throttling devices by detecting the activation status of the system's operating mode, thereby activating different operating modes. It also detects the indoor temperature and compares it with a set temperature to activate different dehumidification + hot water production modes (prioritizing ensuring the indoor temperature doesn't drop too low; when the indoor temperature is not too low, the heat generated by indoor dehumidification is used to produce hot water in the dehumidification + hot water production mode, effectively utilizing energy consumption, improving energy efficiency, and ensuring indoor comfort). The air conditioning and hot water integrated system with temperature control and dehumidification functions of this invention preferably uses environmentally friendly and efficient refrigerants such as R32 and R290.

[0084] In some implementations...

[0085] The discharge end of the compressor 1 is connected to one end of the refrigerant-water heat exchanger 7 through the sixth pipe 106, and the other end of the refrigerant-water heat exchanger 7 flows out through the first pipe 101.

[0086] It also includes a water tank 8 and a water pump 9. The water tank 8 is connected to the interior of the refrigerant-water heat exchanger 7 through a first water passage 201 and a second water passage 202, so that water and refrigerant can exchange heat in the refrigerant-water heat exchanger 7 to produce hot water. The first water passage 201 and / or the second water passage 202 are equipped with a water pump 9.

[0087] In some implementations...

[0088] It also includes an indoor fan 62 and an outdoor fan 61. The outdoor fan 61 is opposite to the outdoor heat exchanger 3 so as to drive airflow to exchange heat with the refrigerant in the outdoor heat exchanger 3. The indoor fan 62 is opposite to at least a portion of the structure of the first indoor heat exchanger 41 and also opposite to at least a portion of the structure of the second indoor heat exchanger 42 so as to drive airflow to exchange heat with the refrigerant in the first indoor heat exchanger 41 and the second indoor heat exchanger 42.

[0089] This invention connects one end of the refrigerant-water heat exchanger 7 to the exhaust end of the compressor via a sixth pipeline. When hot water is needed, the water pump can be turned on to use the high-temperature, high-pressure refrigerant to heat the water in the refrigerant-water heat exchanger, thereby producing hot water at the required temperature. This invention can achieve the functions and effects of indoor dehumidification and dehumidification + hot water production. The indoor and outdoor fans can be turned on or off according to the cooling / heating needs to meet the control requirements.

[0090] 1. The air-conditioning water heater of the present invention comprises a compressor 1, an outdoor heat exchanger 3, a first indoor heat exchanger 41, a second indoor heat exchanger 42, an outdoor fan 61, and an indoor fan 62. The first and second indoor heat exchangers are arranged in series along the refrigerant flow direction. In cooling mode, both indoor heat exchangers function as evaporators simultaneously; in heating mode, both indoor heat exchangers function as condensers simultaneously; and in temperature-controlled dehumidification mode, the first and second indoor heat exchangers function as a reheat condenser and a dehumidification evaporator, respectively.

[0091] 2. The air conditioner also has a first throttling device 51 and a second throttling device 52. The first throttling device 51 is connected in series between the outdoor heat exchanger 3 and the first indoor heat exchanger 41, and the second throttling device 52 is connected in series between the first indoor heat exchanger 41 and the second indoor heat exchanger 42. The first throttling device 51 is an electronic expansion valve with no flow when closed, and the second throttling device 52 is preferably a solenoid valve with throttling when closed or a specially designed dehumidifying electronic expansion valve, which has the flow characteristics of large flow when fully open, small flow during the dehumidification operation, and a sufficiently small slope.

[0092] 3. The air conditioner also has a main four-way reversing valve (four-way valve 2) to switch between different operating modes. The D pipe of the main four-way reversing valve is connected to the exhaust port of the compressor 1 through the refrigerant-water heat exchanger 7, the S pipe is connected to the suction port of the compressor, the E pipe is connected to the second indoor heat exchanger 42, and the C pipe is connected to the outdoor heat exchanger 3.

[0093] 4. The system also includes a water tank 8, which has a water tank inlet 81 and a water tank outlet 82. The water tank supply inlet 83 is connected to the inlet of the water pump 9, and the outlet of the water pump 9 is connected to the heat exchanger water inlet 72 of the refrigerant-water heat exchanger 7. The heat exchanger water outlet 71 of the refrigerant-water heat exchanger 7 is connected to the water tank return inlet 84 of the water tank 8. The refrigerant-water heat exchanger 7 is preferably a shell-and-tube heat exchanger.

[0094] 5. The air conditioner has multiple operating modes, including cooling, heating, temperature control and dehumidification, hot water production, cooling and hot water production simultaneously, temperature control and dehumidification and hot water production simultaneously, heating and hot water production simultaneously, and defrosting.

[0095] 6. This invention proposes a corresponding control method to address the problem of low indoor air supply temperature when operating in a heating and hot water production mode with low water temperature.

[0096] 7. The air conditioning water heater system of the present invention uses environmentally friendly and efficient refrigerants such as R32 and R290.

[0097] The present invention has the following beneficial effects:

[0098] 1. This invention connects two heat exchangers in series on the indoor side and then connects them through a dehumidifying electronic expansion valve. One part of the heat exchangers in the indoor side cools and dehumidifies while the other part heats the indoor return air, thereby achieving temperature control and dehumidification during the transition season and improving the comfort of the dehumidification process.

[0099] 2. The cooling and temperature-controlled dehumidification mode recovers the condensation heat that would otherwise be discharged outdoors through the water heater, providing domestic hot water while cooling and dehumidifying, thus improving the overall energy efficiency of the system;

[0100] 3. The present invention can start or stop the hot water function by controlling the start and stop of the water pump. The multi-functional air conditioning system of the present invention is relatively simple, reliable and low cost.

[0101] like Figure 1 The air conditioning and hot water integrated system with temperature control and dehumidification functions of the present invention shown includes a compressor 1, an outdoor heat exchanger 3, a first throttling device 51, a second throttling device 52, a first indoor heat exchanger 41, a second indoor heat exchanger 42, a four-way valve 2, an outdoor fan 61, an indoor fan 62, a water tank 8, and a liquid storage device 10 for adjusting the refrigerant charge.

[0102] The compressor 1 of this invention has its exhaust port connected to the refrigerant inlet 73 of the refrigerant-water heat exchanger, and its refrigerant outlet 74 connected to the D pipe of the four-way valve 2. The compressor suction port is connected to the S pipe of the four-way reversing valve. The C pipe of the four-way valve 2 is connected to one end of the outdoor heat exchanger, and the other end of the outdoor heat exchanger is connected to the first throttling device 51. The first indoor heat exchanger 41 is connected to both the first throttling device 51 and the second throttling device 52, and the second indoor heat exchanger is connected to both the second throttling device 52 and the E pipe of the four-way reversing valve. The water tank has a water tank inlet 81 and a water tank outlet 82, with tap water replenishing the water in the tank through the water tank inlet 81. The hot water circulation loop is driven by water pump 9. When water in the tank needs to be heated, water pump 9 is activated to pump water from the tank into the cold water inlet of the refrigerant-water heat exchanger 7 for heat exchange with the high-temperature, high-pressure refrigerant gas discharged from the compressor. The water is then returned to the tank through the water return port 84. The four-way reversing valve has two operating states: in the first operating state, its D and C pipes are connected, and its E and S pipes are connected; in the second operating state, its D and E pipes are connected, and its C and S pipes are connected. By controlling the functional valves and water pump, multiple operating modes can be achieved, including individual cooling, heating, temperature-controlled dehumidification, hot water production, cooling and hot water production simultaneously, temperature-controlled dehumidification and hot water production simultaneously, and heating and hot water production simultaneously.

[0103] In some implementations...

[0104] It also includes an auxiliary compression cylinder 12, a liquid storage device 10, a seventh pipeline 107, and an eighth pipeline 108. The intake end of the auxiliary compression cylinder 12 is connected to the upper interior of the liquid storage device 10 through the seventh pipeline 107, and the exhaust end of the auxiliary compression cylinder 12 is connected to the sixth pipeline 106 through the eighth pipeline 108. The other end of the outdoor heat exchanger 3 is connected to the bottom interior of the liquid storage device 10, and the other end of the first indoor heat exchanger 41 is connected to the bottom interior of the liquid storage device 10.

[0105] Figure 8 In a first alternative embodiment of the present invention, the compressor in the main embodiment is replaced with a parallel compressor having two compression cylinders, two suction ports, and one discharge port. The liquid storage device 10 serves as a flash evaporator in this embodiment, with the suction port of the auxiliary compression cylinder 12 connected to the liquid storage device 10 to absorb the refrigerant gas flashed from it. This constitutes a parallel compression cycle, reducing the evaporator inlet specific enthalpy, improving the system's cooling efficiency ratio and heating coefficient of performance, and significantly increasing the system's heating capacity. This alternative embodiment can achieve the same functional modes as the main embodiment, and the valve switching and operation methods under different operating modes are similar to those in the main embodiment.

[0106] In some implementations...

[0107] The first indoor heat exchanger 41, the second indoor heat exchanger 42, the first throttling device 51 and the second throttling device 52 constitute at least part of the structure of a set of indoor unit units, wherein there are multiple indoor unit units and the multiple indoor unit units are connected in parallel to each other.

[0108] Figure 9 In a second alternative embodiment of the present invention, an additional indoor unit is added (i.e., at least one indoor unit unit is connected in parallel, each indoor unit unit including a first indoor heat exchanger 41, a second indoor heat exchanger 42, and corresponding throttling devices: a first throttling device 51 and a second throttling device 52), constituting a multi-split mode for the air conditioning system. The indoor unit can be turned on or off independently (in principle, multiple indoor units can be connected in parallel to form a multi-split mode in the system; this embodiment only describes the multi-split mode with one unit connected in parallel). This alternative embodiment can achieve the same functional mode as the main embodiment, and the switching of valves for different operating modes and the operating methods are similar to those in the main embodiment.

[0109] The present invention also provides a control method for an integrated air conditioning and hot water system with temperature control and dehumidification functions as described above, wherein:

[0110] When the integrated air conditioning and hot water system with temperature control and dehumidification functions simultaneously includes a four-way valve 2, a first throttling device 51, a second throttling device 52, an indoor fan 62, an outdoor fan 61, and a water pump 9, the control method includes:

[0111] Testing steps, and the required operating modes of the testing system;

[0112] The judgment step is to determine which of the following operating modes is required: cooling mode, heating mode, dehumidification mode, cooling + hot water mode, heating + hot water mode, and dehumidification + hot water mode.

[0113] The control steps include controlling the switching of the four-way valve 2 according to the needs of different operating modes, controlling the opening and closing of the first throttling device 51 and the second throttling device 52 and adjusting the opening size, controlling the opening and closing of the indoor fan 62 and the outdoor fan 61, and controlling the opening and closing of the water pump 9.

[0114] This invention, through a structure comprising a compressor, an outdoor heat exchanger, first and second indoor heat exchangers, a refrigerant-water heat exchanger, and only one four-way valve, and the specific connection method described above, integrates the refrigerant-water heat exchanger into a conventional air conditioning system, organically combining a heat pump water heater and an air conditioning system. It can achieve multiple operating modes, including cooling, heating, dehumidification, hot water supply, simultaneous cooling and hot water supply, simultaneous heating and hot water supply, and dehumidification + hot water production. Specifically, it can simultaneously achieve cooling + hot water production, heating + hot water production, and dehumidification + hot water production modes. Through the aforementioned connection method, the first and second indoor heat exchangers are connected in series, providing conditions for dehumidification. Furthermore, only a single four-way valve is needed to switch between cooling, heating, and dehumidification, as well as between cooling + hot water production, heating + hot water production, and dehumidification + hot water production modes. Compared to existing technologies that require... The invention effectively reduces the number of four-way valves required by using two or more valves, significantly reducing costs and allowing for a smaller, more compact structure. In multiple operating modes, the invention allows for the sharing or partial sharing of the same heat exchanger and piping system. Compared to simultaneously installing an air conditioner and a heat pump water heater, this saves initial investment and operating costs, and improves overall system efficiency. Furthermore, the air conditioning system can utilize the condensation heat generated by the refrigeration system for heating water in a cooling + hot water production mode, and can also utilize the indoor heat absorbed during dehumidification for hot water production in a dehumidification + hot water production mode. This reduces heat emissions into the environment, lowers thermal pollution, and improves system energy efficiency. The invention enables a single air conditioning system to perform conventional cooling and heating functions, as well as temperature control, dehumidification, and water heater functions, effectively reducing equipment costs and downtime.

[0115] In some implementations...

[0116] In the control steps, when the required operating mode of the system is cooling mode, the four-way valve 2 is controlled to connect the first D end D with the first C end C, and at the same time, the first E end E with the first S end S. The first throttling device 51 is controlled to open and its opening degree is controlled to change. The second throttling device 52 is fully opened. The outdoor fan 61 and the indoor fan 62 are both controlled to run. The water pump 9 is controlled to shut down.

[0117] When the required operating mode of the system is heating mode, the four-way valve 2 is controlled to connect the first D end D with the first E end E, and at the same time, the first C end C with the first S end S. The first throttling device 51 is controlled to open and its opening degree is controlled to change. The second throttling device 52 is fully open. The outdoor fan 61 and the indoor fan 62 are both controlled to run. The water pump 9 is controlled to shut down.

[0118] When the required operating mode of the system is temperature control and dehumidification, the four-way valve 2 is controlled to connect the first D end D with the first C end C, and at the same time, the first E end E with the first S end S. The second throttling device 52 is controlled to open and its opening degree is controlled to change. The first throttling device 51 is fully open, and both the outdoor fan 61 and the indoor fan 62 are controlled to run. The water pump 9 is controlled to shut down.

[0119] When the required operating mode of the system is cooling + hot water mode, the four-way valve 2 is controlled to connect the first D end D with the first C end C, and at the same time, the first E end E with the first S end S. The first throttling device 51 is controlled to open and its opening degree is controlled to change. The second throttling device 52 is fully open. The outdoor fan 61 is controlled to turn off, the indoor fan 62 is controlled to run, and the water pump 9 is controlled to turn on.

[0120] When the required operating mode of the system is heating + hot water production mode, the four-way valve 2 is controlled to connect the first D end D with the first E end E, and at the same time, the first C end C with the first S end S. The second throttling device 52 is fully opened, the first throttling device 51 is opened and its opening degree is controlled to change. The outdoor fan 61 and the indoor fan 62 are both controlled to run, and the water pump 9 is controlled to turn on.

[0121] like Figure 1As shown, during cooling mode operation, the four-way valve 2 is de-energized, allowing pipes D and C to conduct, and pipes S and E to conduct. The high-temperature, high-pressure refrigerant gas discharged from the compressor enters pipe D of the four-way valve 2 after passing through the refrigerant-water heat exchanger 7. It then enters the outdoor heat exchanger 3 via pipes D and C of the four-way valve 2, where it releases heat and condenses into a high-pressure liquid refrigerant. After being throttled and depressurized by the first throttling device 51, it becomes a low-temperature, low-pressure two-phase state and sequentially enters the first indoor heat exchanger 41 and the second indoor heat exchanger 42. In the indoor heat exchangers, it absorbs heat and vaporizes, cooling the indoor air to meet the cooling requirements. After heat exchange, the low-pressure refrigerant gas enters the compressor's suction port via pipes E and S of the four-way valve 2, where it is compressed into a high-temperature, high-pressure gas state within the compressor cylinder, thus completing the entire refrigeration cycle.

[0122] In this mode, the second throttling device 52 inside the room is fully open to reduce the refrigerant pressure drop between the first indoor heat exchanger 41 and the second indoor heat exchanger 42. The water pump 9 connected to the water tank is in the off state.

[0123] like Figure 2 As shown, during heating mode operation, the four-way valve 2 is in the second conducting state. In this mode, pipes D and E of the four-way valve 2 are conducting, and pipes C and S are conducting. The high-temperature, high-pressure refrigerant gas discharged from the compressor enters pipe D of the four-way valve 2 after passing through the refrigerant-water heat exchanger 7. It then sequentially enters the second indoor heat exchanger 42 and the first indoor heat exchanger 41 through pipes D and E of the four-way valve 2, condensing and releasing heat to become a high-pressure subcooled liquid. After being throttled and depressurized by the first throttling device 51, it enters the outdoor heat exchanger 3 to evaporate and absorb heat from the outdoor environment, becoming a low-pressure superheated gas. The gaseous refrigerant flowing out of the outdoor heat exchanger 3 enters the compressor suction port through pipes C and S of the four-way valve 2 and is compressed into a high-temperature, high-pressure gas state in the compressor cylinder before being discharged from the compressor discharge port, thus completing the entire heating cycle.

[0124] In this mode, the second throttling device 52 inside the room is fully open to reduce the refrigerant pressure drop between the second indoor heat exchanger 42 and the first indoor heat exchanger 41. The circulating water pump 9 connected to the water tank is in the off state.

[0125] like Figure 3As shown, during temperature control and dehumidification mode operation, the four-way valve 2 is in the first conducting state, with pipes D and C connected, and pipes E and S connected. The high-temperature, high-pressure refrigerant gas discharged from the compressor enters pipe D of the four-way valve 2 after passing through the refrigerant-water heat exchanger 7. After passing through pipes D and C of the four-way valve 2, it enters the outdoor heat exchanger 3, releases some heat, and then enters the first indoor heat exchanger 41 to continue releasing heat and condensing into a subcooled liquid state. The refrigerant exiting the first indoor heat exchanger passes through the second throttling device 52 to reduce its pressure and then enters the second indoor heat exchanger 42. In the second indoor heat exchanger 42, the low-temperature, low-pressure refrigerant absorbs heat from the indoor air and vaporizes into a low-pressure superheated gas state. It then enters the compressor's suction port through pipes E and S of the four-way valve 2. The refrigerant is compressed into a high-temperature, high-pressure state in the compressor cylinder and then discharged through the compressor's exhaust port, thus completing the entire reheat dehumidification cycle.

[0126] In this mode, the second throttling device 52 indoors is in a throttling state, the first throttling device 51 is fully open, and the circulating water pump 9 connected to the water tank is closed. The second indoor heat exchanger 42 acts as a separate evaporator to cool and dehumidify the indoor air, while the first indoor heat exchanger 41 acts as a reheat condenser to heat and raise the temperature of the indoor return air. The low-temperature, low-humidity air passing through the evaporator is mixed with the high-temperature air passing through the reheat heat exchanger before being sent into the room, increasing the supply air temperature during the dehumidification process and ensuring indoor environmental comfort. When operating in this mode, the supply air temperature can be adjusted by regulating the outdoor fan speed; that is, the lower the outdoor fan speed, the higher the supply air temperature.

[0127] like Figure 4 As shown, during single-hot water operation, the four-way valve 2 is in the second open state, with pipes D and E connected, and pipes C and S connected. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the refrigerant-water heat exchanger 7, where it condenses and releases heat to heat the water. The refrigerant, now in a subcooled liquid state, passes through the second indoor heat exchanger 42 and the first indoor heat exchanger 41, and is then throttled and depressurized by the first throttling device 51 before entering the outdoor heat exchanger 3. In the outdoor heat exchanger 3, the low-temperature, low-pressure refrigerant absorbs heat from the outdoor environment and vaporizes into a low-pressure superheated gas state. It then enters the compressor's suction port through pipes C and S of the four-way valve 2. The refrigerant is compressed into a high-temperature, high-pressure state in the compressor cylinder and discharged through the compressor's exhaust port, thus completing the entire hot water cycle.

[0128] In this mode, the indoor fan 62 is stopped, the second throttling device 52 is fully open, and the first throttling device 51 plays a major throttling role, controlling the compressor's suction superheat to ensure system reliability and energy efficiency. The water pump 9, connected to the water tank, starts operating. The starting of the circulating water pump and compressor is determined by the temperature of the water tank's temperature sensor and the set water temperature; that is, the water pump and compressor start when the water tank temperature is lower than the set value, and the greater the temperature difference, the higher the speed of the water pump and compressor. When the water tank temperature reaches the target temperature, the water pump and compressor stop.

[0129] like Figure 5 As shown, during the cooling + hot water production mode, the four-way valve 2 is in the first conducting state, with pipes D and C connected, and pipes E and S connected. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the refrigerant-water heat exchanger 7, where it condenses and releases heat to heat the water. The refrigerant, now in a subcooled liquid state after condensation, passes through the outdoor heat exchanger 3 and is throttled and depressurized by the first throttling device 51 to a low-temperature, low-pressure state. It then passes through the first indoor heat exchanger 41 and the second indoor heat exchanger 42. After absorbing heat from the ambient air in the first and second indoor heat exchangers 41 and 42, it vaporizes into a low-pressure superheated gas state and enters the compressor's suction port through pipes C and S of the four-way valve 2. The refrigerant is compressed into a high-temperature, high-pressure state in the compressor cylinder and then discharged through the compressor's exhaust port, thus completing the entire cooling and hot water production cycle.

[0130] In this mode, the second throttling device 52 is fully open, and the first throttling device 51 plays a major throttling role, controlling the compressor's suction superheat to ensure system reliability and operational efficiency. The water pump connected to the water tank is on, and the outdoor fan is off. In this mode, when the difference between the water pump's starting temperature and the outdoor ambient temperature is lower than a set value, the water pump's flow rate is reduced to ensure that the outdoor heat exchanger's pipe temperature is higher than the outdoor ambient temperature, thus guaranteeing the cooling effect. When the hot water temperature rises to a certain value, the circulating water pump's flow rate is increased to reduce the exhaust saturation temperature and improve system operational efficiency.

[0131] More preferably,

[0132] When in heating + hot water mode

[0133] The detection step also includes detecting the tube temperature of the first indoor heat exchanger;

[0134] When the pipe temperature is less than the preset pipe temperature, the indoor fan 62 is controlled to stop; when the pipe temperature is greater than or equal to the preset pipe temperature, the indoor fan 62 is controlled to run.

[0135] The detection step also includes detecting the water temperature in the water tank;

[0136] When the water temperature is less than the preset water temperature, the speed of the water pump 9 and the speed of the indoor fan 62 are reduced. When the water temperature is greater than or equal to the preset water temperature, the speed of the water pump 9 and the speed of the indoor fan 62 are increased.

[0137] like Figure 6 As shown, during the simultaneous heating and hot water production mode, the four-way valve 2 is in the second open state, with pipes D and E connected, and pipes C and S connected. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the refrigerant-water heat exchanger 7, where it condenses and releases heat to heat the water. The refrigerant that condenses and releases heat in the refrigerant-water heat exchanger passes through pipes D and E of the four-way reversing valve and enters the second indoor heat exchanger 42 and the first indoor heat exchanger 41 for further heat release. The subcooled refrigerant flowing out of the indoor heat exchanger is throttled and depressurized by the first throttling device 51 to a low-temperature, low-pressure state before entering the outdoor heat exchanger 3. In the outdoor heat exchanger 3, after absorbing heat from the ambient air, it vaporizes into a low-pressure superheated gas state and enters the compressor's suction port through pipes C and S of the four-way valve 2. The refrigerant is compressed into a high-temperature, high-pressure state in the compressor cylinder and then discharged through the compressor's exhaust port, thus completing the entire cycle of simultaneous heating and hot water production.

[0138] In this mode, the second throttling device 52 is fully open, and the first throttling device 51 plays a major throttling role, controlling the compressor's suction superheat to ensure system reliability and operational efficiency. The water pump 9 connected to the water tank is running. During the initial pump startup, the low water temperature results in a low compressor discharge saturation temperature. Therefore, during simultaneous heating and hot water operation, it is necessary to prevent comfort issues caused by cold air blowing into the room. The activation of the indoor fan can be determined by the pipe temperature of the first indoor heat exchanger 41; the indoor fan activates when the indoor pipe temperature exceeds a preset value and does not activate when the indoor pipe temperature is below the preset value. Simultaneously, the circulating water pump flow rate and indoor fan speed are correlated with the water temperature. When the water temperature is below a preset value, the circulating water flow rate and indoor fan speed are reduced to increase the compressor discharge saturation temperature, ensuring the air supply temperature meets comfort requirements during heating mode. When the water temperature reaches another preset value, the circulating water flow rate and indoor fan speed are appropriately increased to improve system operational efficiency.

[0139] In some implementations...

[0140] When the required operating mode of the system is temperature control and dehumidification + hot water production mode

[0141] Control the four-way valve 2 to connect the first D end D with the first C end C, and at the same time connect the first E end E with the first S end S; control the first throttling device 51 to be fully open, control the second throttling device 52 to be opened and control its opening degree to change, control the outdoor fan 61 to stop, and control the indoor fan 62 to run.

[0142] The detection step also includes detecting the indoor temperature;

[0143] When the indoor temperature minus the preset temperature is less than the first preset value, the speed of the water pump 9 is controlled to be less than the preset speed or the water pump 9 is controlled to stop. When the indoor temperature minus the preset temperature is greater than the first preset value, the speed of the water pump 9 is controlled to be greater than or equal to the preset speed.

[0144] like Figure 7 As shown, during the simultaneous temperature control, dehumidification, and hot water production mode, the four-way valve 2 is in the first open state, with pipes D and C connected, and pipes E and S connected. The high-temperature, high-pressure refrigerant gas discharged from the compressor condenses and releases heat in the refrigerant-water heat exchanger 7, heating the water within. The refrigerant that condenses and releases heat in the refrigerant-water heat exchanger passes through pipes D and C of the four-way reversing valve and sequentially enters the outdoor heat exchanger 3 and the first indoor heat exchanger 41. The subcooled refrigerant liquid exiting the first indoor heat exchanger is throttled and depressurized by the second throttling device 52 before entering the second indoor heat exchanger 42. In the second indoor heat exchanger 42, the low-temperature, low-pressure refrigerant absorbs heat from the indoor air and vaporizes into a low-pressure superheated gas state. It then enters the compressor's suction port through pipes E and S of the four-way valve 2. The refrigerant is compressed into a high-temperature, high-pressure state within the compressor cylinder and discharged through the compressor's exhaust port, thus completing the entire cycle of temperature control, dehumidification, and simultaneous hot water production.

[0145] In this mode, the first throttling device 51 is fully open, and the second throttling device 52 plays a major throttling role, controlling the compressor's suction superheat to ensure system reliability and energy efficiency. The outdoor fan 61 is stopped, while the water pump 9 connected to the water tank is running. Initially, due to the low water temperature, the compressor's discharge saturation temperature is low, and the high-pressure refrigerant has a high degree of subcooling at the outlet of the refrigerant-water heat exchanger 7. Therefore, during temperature control, dehumidification, and hot water production mode, if the difference between the indoor temperature and the set temperature exceeds a preset value, the indoor temperature can be increased by reducing the speed of the circulating water pump or appropriately stopping the pump to improve comfort during dehumidification. When the difference between the indoor temperature and the set temperature exceeds a preset value, the water pump 9 is restarted or the water flow rate is increased.

[0146] This invention controls the switching of a four-way valve and a throttling device by detecting the activation status of the system's operating modes, thereby activating different operating modes. The integrated air conditioning and hot water system with temperature control and dehumidification functions of this invention uses environmentally friendly and efficient refrigerants such as R32 and R290.

[0147] In some implementations...

[0148] The judgment step, after determining that it is neither a cooling mode nor a heating mode, then determines whether it is a single hot water mode.

[0149] In the control steps, if it is a single hot water mode, the four-way valve 2 is controlled to connect the first D end D with the first E end E, and at the same time, the first C end C with the first S end S. The second throttling device 52 is fully opened, the first throttling device 51 is opened and its opening degree is controlled to change. The indoor fan 62 is stopped, the outdoor fan 61 is started, and the water pump 9 is turned on.

[0150] like Figure 4 As shown, when operating in single hot water mode, the four-way valve 2 is in the second open state, as... Figure 4 As shown. The D and E pipes of the four-way valve 2 are connected, and the C and S pipes are connected. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the refrigerant-water heat exchanger 7, where it condenses and releases heat to heat the water. The refrigerant, now in a subcooled liquid state, passes sequentially through the second indoor heat exchanger 42 and the first indoor heat exchanger 41, and is then throttled and depressurized by the first throttling device 51 before entering the outdoor heat exchanger 3. In the outdoor heat exchanger 3, the low-temperature, low-pressure refrigerant absorbs heat from the outdoor environment and vaporizes into a low-pressure superheated gas state. It then enters the compressor's suction port through the C and S pipes of the four-way valve 2. The refrigerant is compressed into a high-temperature, high-pressure state in the compressor cylinder and discharged through the compressor's exhaust port, thus completing the entire hot water production cycle.

[0151] In this mode, the indoor fan 62 is stopped, the second throttling device 52 is fully open, and the first throttling device 51 plays a major throttling role, controlling the compressor's suction superheat to ensure system reliability and energy efficiency. The water pump 9, connected to the water tank, starts operating. The starting of the circulating water pump and compressor is determined by the temperature of the water tank's temperature sensor and the set water temperature; that is, the water pump and compressor start when the water tank temperature is lower than the set value, and the greater the temperature difference, the higher the speed of the water pump and compressor. When the water tank temperature reaches the target temperature, the water pump and compressor stop.

[0152] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An integrated air conditioning and hot water system with temperature control and dehumidification functions, characterized in that: include: The compressor (1), outdoor heat exchanger (3), first indoor heat exchanger (41), second indoor heat exchanger (42), refrigerant-water heat exchanger (7) and four-way valve (2) are provided. The discharge end of the compressor (1) is connected to one end of the refrigerant-water heat exchanger (7), and the other end of the refrigerant-water heat exchanger (7) is connected to one end of the outdoor heat exchanger (3) or to one end of the second indoor heat exchanger (42). The other end of the second indoor heat exchanger (42) is connected to one end of the first indoor heat exchanger (41), and the other end of the first indoor heat exchanger (41) is connected to the other end of the outdoor heat exchanger (3). The suction end of the compressor (1) is connected to one end of the outdoor heat exchanger (3) or to one end of the second indoor heat exchanger (42). There is only one four-way valve (2). The four-way valve (2) includes a first D end (D), a first E end (E), a first S end (S), and a first C end (C). The four-way valve (2) can switch between the following two connection states: In the first state, the first D end (D) is connected to the first C end (C), and the first E end (E) is connected to the first S end (S); In the second state, the first D end (D) is connected to the first E end (E), and the first C end (C) is connected to the first S end (S). The first D end (D) is connected to the other end of the refrigerant-water heat exchanger (7) through the first pipe (101), the first E end (E) is connected to one end of the second indoor heat exchanger (42) through the second pipe (102), the first S end (S) is connected to the suction end of the compressor (1) through the third pipe (103), and the first C end (C) is connected to one end of the outdoor heat exchanger (3) through the fourth pipe (104). The other end of the outdoor heat exchanger (3) is connected to the other end of the first indoor heat exchanger (41) through the fifth pipeline (105). The fifth pipeline (105) is equipped with a first throttling device (51). The first indoor heat exchanger (41) and the second indoor heat exchanger (42) are connected in series, and a second throttling device (52) is also provided between them. The exhaust end of the compressor (1) is connected to one end of the refrigerant-water heat exchanger (7) through the sixth pipe (106), and the other end of the refrigerant-water heat exchanger (7) flows out through the first pipe (101); It also includes a water tank (8) and a water pump (9). The water tank (8) is connected to the interior of the refrigerant-water heat exchanger (7) through a first water passage (201) and the water tank (8) is connected to the interior of the refrigerant-water heat exchanger (7) through a second water passage (202) so that water and refrigerant can exchange heat in the refrigerant-water heat exchanger (7) to produce hot water. A water pump (9) is provided on the first water passage (201) and / or the second water passage (202). It also includes an indoor fan (62) and an outdoor fan (61), the outdoor fan (61) being opposite to the outdoor heat exchanger (3) to drive airflow to exchange heat with the refrigerant in the outdoor heat exchanger (3), the indoor fan (62) being opposite to at least a portion of the structure of the first indoor heat exchanger (41), and the indoor fan (62) also being opposite to at least a portion of the structure of the second indoor heat exchanger (42) to drive airflow to exchange heat with the refrigerant in the first indoor heat exchanger (41) and the second indoor heat exchanger (42).

2. The integrated air conditioning and hot water system with temperature control and dehumidification functions according to claim 1, characterized in that: It also includes an auxiliary compression cylinder (12), a liquid storage device (10), a seventh pipeline (107) and an eighth pipeline (108). The intake end of the auxiliary compression cylinder (12) is connected to the upper interior of the liquid storage device (10) through the seventh pipeline (107), and the exhaust end of the auxiliary compression cylinder (12) is connected to the sixth pipeline (106) through the eighth pipeline (108). The other end of the outdoor heat exchanger (3) is connected to the bottom interior of the liquid storage device (10), and the other end of the first indoor heat exchanger (41) is connected to the bottom interior of the liquid storage device (10).

3. The integrated air conditioning and hot water system with temperature control and dehumidification functions according to claim 1, characterized in that: The first indoor heat exchanger (41), the second indoor heat exchanger (42), the first throttling device (51) and the second throttling device (52) constitute at least part of the structure of a set of indoor unit units, wherein there are multiple indoor unit units and the multiple indoor unit units are connected in parallel to each other.

4. A control method for an integrated air conditioning and hot water system with temperature control and dehumidification function as described in any one of claims 1-3, characterized in that: include: Testing steps, and the required operating modes of the testing system; The judgment step is to determine which of the following operating modes is required: cooling mode, heating mode, temperature control and dehumidification mode, cooling + hot water mode, heating + hot water mode, and hot water only mode. The control steps include controlling the switching of the four-way valve (2) according to the needs of different operating modes, controlling the opening and closing of the first throttling device (51) and the second throttling device (52) and adjusting the opening size, controlling the opening and closing of the indoor fan (62) and the outdoor fan (61), and controlling the opening and closing of the water pump (9).

5. The control method according to claim 4, characterized in that: In the control steps, when the required operating mode of the system is the cooling mode, the four-way valve (2) is controlled to connect the first D end (D) with the first C end (C), and at the same time, the first E end (E) is connected with the first S end (S). The first throttling device (51) is controlled to open and its opening degree is controlled to change. The second throttling device (52) is fully opened. The outdoor fan (61) and the indoor fan (62) are both controlled to run. The water pump (9) is controlled to shut down. When the required operating mode of the system is heating mode, the four-way valve (2) is controlled to connect the first D end (D) with the first E end (E), and at the same time the first C end (C) is connected with the first S end (S). The first throttling device (51) is controlled to open and its opening degree is controlled to change. The second throttling device (52) is fully opened. The outdoor fan (61) and the indoor fan (62) are both controlled to run. The water pump (9) is controlled to shut down. When the required operating mode of the system is temperature control and dehumidification mode, the four-way valve (2) is controlled to connect the first D end (D) with the first C end (C), and at the same time the first E end (E) is connected with the first S end (S). The second throttling device (52) is controlled to open and its opening degree is controlled to change. The first throttling device (51) is fully open, and the outdoor fan (61) and the indoor fan (62) are both controlled to run. The water pump (9) is controlled to shut down. When the required operating mode of the system is cooling + hot water mode, the four-way valve (2) is controlled to connect the first D end (D) and the first C end (C), and at the same time the first E end (E) and the first S end (S) are connected. The first throttling device (51) is controlled to open and its opening degree is controlled to change. The second throttling device (52) is fully opened. The outdoor fan (61) is controlled to turn off. The indoor fan (62) is controlled to run. The water pump (9) is controlled to turn on. When the required operating mode of the system is heating + hot water mode, the four-way valve (2) is controlled to connect the first D end (D) with the first E end (E), and at the same time the first C end (C) is connected with the first S end (S). The second throttling device (52) is fully opened, the first throttling device (51) is opened and its opening degree is controlled to change. The outdoor fan (61) and the indoor fan (62) are both operated. The water pump (9) is turned on.

6. The control method according to claim 5, characterized in that: When in heating + hot water mode The detection step also includes detecting the tube temperature of the first indoor heat exchanger; When the pipe temperature is less than the preset pipe temperature, the indoor fan (62) is controlled to stop; when the pipe temperature is greater than or equal to the preset pipe temperature, the indoor fan (62) is controlled to run. The detection step also includes detecting the water temperature in the water tank; When the water temperature is less than the preset water temperature, the speed of the water pump (9) is reduced and the speed of the indoor fan (62) is reduced. When the water temperature is greater than or equal to the preset water temperature, the speed of the water pump (9) is increased and the speed of the indoor fan (62) is increased.

7. The control method according to claim 4, characterized in that: When the system requires a single-function hot water mode. Control the four-way valve (2) to connect the first D end (D) with the first C end (C), and at the same time connect the first E end (E) with the first S end (S); control the first throttling device (51) to be fully open, control the second throttling device (52) to be opened and control its opening degree to change, control the outdoor fan (61) to stop, and control the indoor fan (62) to run; The detection step also includes detecting the indoor temperature; When the indoor temperature - preset temperature < first preset value, control the speed of the water pump (9) to be less than the preset speed or control the water pump (9) to stop. When the indoor temperature - preset temperature > first preset value, control the speed of the water pump (9) to be greater than or equal to the preset speed.

8. The control method according to claim 4, characterized in that: The judgment step, after determining that it is neither a cooling mode nor a heating mode, then determines whether it is a single hot water mode. In the control steps, if it is a single hot water mode, control the four-way valve (2) to connect the first D end (D) with the first E end (E), and at the same time connect the first C end (C) with the first S end (S), and control the second throttling device (52) to be fully open, control the first throttling device (51) to open and control its opening degree to change, and control the indoor fan (62) to stop, the outdoor fan (61) to run, and control the water pump (9) to be turned on.

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