Combined power supply system and control method thereof

Abstract

The present invention discloses a combined heat supply system and a control method thereof, the combined heat supply system comprising: a high-temperature heat source and a low-temperature heat source, wherein the outlet water temperature of the high-temperature heat source is greater than the outlet water temperature of the low-temperature heat source; the high-temperature heat source is provided with a first inlet and a first outlet, the first outlet is used to communicate with the water inlet of a fan heat exchanger through a first water inlet pipe, and the first inlet is used to communicate with the return water outlet of the fan heat exchanger through a first return water pipe; the low-temperature heat source is provided with a second inlet and a second outlet, the second inlet is used to communicate with the first return water pipe, and the second outlet is used to communicate with the first water inlet pipe; a flow control device is used to control the flow between the high-temperature heat source and the low-temperature heat source. The present invention can achieve a rapid heating effect, further ensure heating comfort and energy saving, and enhance the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange systems, and in particular to a combined heat supply system and a control method thereof. Background Art

[0002] In order to meet the rapidly growing demand for winter heating in some non-central heating areas in my country, the solutions currently commonly used mainly include: using heat pumps to meet summer air conditioning and winter heating needs.

[0003] For the scheme using heat pump dual-generation, when the temperature drops in winter, the heating capacity of the heat pump decreases, while the heating load demand is very high, resulting in poor heating effect.

[0004] Overall, the current heat pump combined heat supply system needs further improvement to optimize the comprehensive heating effects such as heating rate, heating comfort, and heating energy saving, so as to improve the user experience. Summary of the Invention

[0005] In order to overcome at least one defect of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a combined heating system that can ensure a rapid heating effect and enhance the user experience.

[0006] The specific technical solution of the embodiment of the present invention is:

[0007] A combined heat supply system, comprising: a high-temperature heat source and a low-temperature heat source, wherein the outlet water temperature of the high-temperature heat source is greater than the outlet water temperature of the low-temperature heat source;

[0008] The high-temperature heat source is provided with a first inlet and a first outlet, the first outlet is used to be connected to the water inlet of the fan heat exchanger through a first water inlet pipeline, and the first inlet is used to be connected to the return outlet of the fan heat exchanger through a first return water pipeline;

[0009] The low-temperature heat source is provided with a second inlet and a second outlet, the second inlet is used to be connected to the first return water pipeline, and the second outlet is used to be connected to the first water inlet pipeline;

[0010] A flow control device is used to control the flow between the high-temperature heat source and the low-temperature heat source.

[0011] Furthermore, the combined heat supply system has a first mode and / or a second mode. In the first mode, a circulation flow path is formed between the high-temperature heat source and the fan heat exchanger; in the second mode, a circulation flow path is formed between the low-temperature heat source and the fan heat exchanger.

[0012] Furthermore, the flow control device is used to shut off the flow between the high-temperature heat source and the low-temperature heat source.

[0013] Furthermore, the second inlet is connected to a first position of the first return water pipeline through a first connecting pipeline; the second outlet is connected to a second position of the first water inlet pipeline through a second connecting pipeline.

[0014] Furthermore, the flow control device is a water channel switching valve set at the first position or the second position.

[0015] Furthermore, the water path switching valve includes a first port, a second port and a third port, the first port and the second port are respectively connected to the first return water pipe, the third port is connected to the first connecting pipe, the first port is located upstream of the second port, and the water path switching valve has a first state and a second state. When the water path switching valve is in the first state, the first port and the second port are connected, and when the water path switching valve is in the second state, the first port and the third port are connected.

[0016] Furthermore, the water path switching valve includes a first port, a second port and a third port, the first port and the second port are respectively connected to the first water inlet pipe, the third port is connected to the second connecting pipe, the first port is located upstream of the second port, and the water path switching valve has a first state and a second state. When the water path switching valve is in the first state, the first port and the second port are connected, and when the water path switching valve is in the second state, the second port and the third port are connected.

[0017] Furthermore, the flow control device includes a first solenoid valve and a second solenoid valve.

[0018] Further, the first solenoid valve is arranged in the second connecting pipeline, the second solenoid valve is arranged in the first part of the pipeline of the first water inlet pipeline, and the first part of the pipeline is located between the second position and the first outlet, or the second solenoid valve is arranged in the second part of the pipeline of the first return pipeline, and the second part of the pipeline is located between the first position and the first inlet.

[0019] Further, the first solenoid valve is arranged in the first connecting pipeline, the second solenoid valve is arranged in the second part of the pipeline of the first return pipeline, and the second part of the pipeline is located between the first position and the first inlet, or the second solenoid valve is arranged in the first part of the pipeline of the first water inlet pipeline, and the first part of the pipeline is located between the second position and the first outlet.

[0020] Furthermore, the flow control device includes a third solenoid valve and a one-way valve.

[0021] Furthermore, the one-way valve is arranged on the second connecting pipeline, the third solenoid valve is arranged in the second part of the pipeline in the first return pipeline or in the first part of the pipeline in the first water inlet pipeline, the first part of the pipeline is located between the second position and the first outlet, and the second part of the pipeline is located between the first position and the first inlet.

[0022] Furthermore, the one-way valve is arranged in a first portion of the first water inlet pipeline, the third solenoid valve is arranged in the first connecting pipeline or the second connecting pipeline, and the first portion of the pipeline is located between the second position and the first outlet.

[0023] Furthermore, the high-temperature heat source is a gas heating device; the low-temperature heat source is an air energy device.

[0024] Furthermore, the combined supply system also includes a heat exchange device; the outlet of the heat exchange device is used to connect to the first connecting pipeline through a third connecting pipeline; the inlet of the heat exchange device is used to connect to the second connecting pipeline through a fourth connecting pipeline.

[0025] Furthermore, the flow control device is arranged at a third position where the third connecting pipeline is connected to the first connecting pipeline, or is arranged on the third part of the pipeline, or is arranged at a fourth position where the first connecting pipeline is connected to the first return pipeline; the third part of the pipeline is located between the third position and the fourth position.

[0026] Furthermore, the flow control device includes any one of the following: a water channel switching valve arranged at the third position or the fourth position; a fourth solenoid valve arranged on the third part of the pipeline.

[0027] Furthermore, a one-way valve or a fifth solenoid valve is provided between the second connecting pipeline and the first outlet of the high-temperature heat source.

[0028] Furthermore, a one-way valve or a sixth solenoid valve is provided on the second connecting pipeline.

[0029] Furthermore, a one-way valve or a seventh solenoid valve is provided on the third connecting pipeline or the fourth connecting pipeline.

[0030] Furthermore, an energy storage water tank is provided on the second connecting pipeline.

[0031] Furthermore, a bypass pipeline for bypassing the energy storage water tank is also provided on the second connecting pipeline.

[0032] Furthermore, the combined heat supply system further includes a hot water tank, and the high-temperature heat source and / or the low-temperature heat source are in communication with the hot water tank for supplying hot water to the hot water tank.

[0033] Furthermore, the heat exchange device includes a radiation heat exchanger.

[0034] A control method for a combined heat supply system, the combined heat supply system comprising a high-temperature heat source, a low-temperature heat source, a flow control device, and a fan heat exchanger; the control method comprising:

[0035] Obtaining a user-set temperature and an indoor temperature of an indoor space where each fan heat exchanger in a working state is located, and obtaining a first temperature difference based on the user-set temperature and the indoor temperature;

[0036] Determining a second temperature difference of the space where the combined heat supply system is located based on the first temperature difference obtained in the indoor space where each of the fan heat exchangers in the working state is located;

[0037] When the second temperature difference is greater than the first temperature difference threshold, the flow control device is controlled to be in the first state, so that the high-temperature heat source provides heating to the fan heat exchanger.

[0038] Furthermore, when the second temperature difference is not greater than the first temperature difference threshold, the control method further includes:

[0039] Determining a first heating fee required for heating based on the high-temperature heat source and a second heating fee required for heating based on the low-temperature heat source when producing the same amount of heat;

[0040] Whether it is necessary to switch heating from the high-temperature heat source to heating from the low-temperature heat source is determined based on the first heating fee and the second heating fee.

[0041] Furthermore, the high-temperature heat source is a gas heating device, and determining the first heating fee includes:

[0042] Obtaining a gas price in a geographical area where the combined power supply system is located and a first energy efficiency of the gas heating device;

[0043] A first heating fee required by the gas heating device to prepare the same amount of heat is determined based on the gas price and the first energy efficiency.

[0044] Furthermore, the low-temperature heat source is an air energy device, and the combined heat supply system stores a first correspondence between the ambient temperature, the heating load, and the overall energy efficiency of the air energy device. Determining the second heating fee includes:

[0045] Obtaining the outdoor ambient temperature at the installation location of the cogeneration system, the electricity price in the geographical area, and the required total load;

[0046] determining a second energy efficiency of the air energy device based on the ambient temperature, the required total load, and the first corresponding relationship;

[0047] Based on the electricity price and the second energy efficiency, a second heating fee required by the air energy device when preparing the same amount of heat is determined.

[0048] Furthermore, when the first heating cost is greater than the second heating cost, the flow control device is controlled to be in the second state, and the low-temperature heat source provides heating to the fan heat exchanger.

[0049] Furthermore, when the first heating cost is not greater than the second heating cost, the high-temperature heat source is maintained to provide heating to the fan heat exchanger.

[0050] Furthermore, when the second temperature difference is not greater than the first temperature difference threshold, the control method further includes: controlling the flow control device to be in a second state, and the low-temperature heat source provides heating to the fan heat exchanger.

[0051] Furthermore, when the second temperature difference is greater than the first temperature difference threshold, the control method further includes: controlling the flow control device to be in the first state, and again supplying heat to the fan heat exchanger from the high-temperature heat source.

[0052] Furthermore, when the second temperature difference is not greater than the first temperature difference threshold, the control method further includes: maintaining the high-temperature heat source to provide heating to the fan heat exchanger.

[0053] Furthermore, based on the first temperature difference, the fan speed of the fan heat exchanger is controlled, and the controlling of the fan speed of the fan heat exchanger includes any one of the following: reducing, keeping it unchanged first and then reducing.

[0054] Furthermore, the method further comprises:

[0055] determining a required load based on the first temperature difference;

[0056] The combined power supply system stores a second correspondence between the required load and the required total load;

[0057] determining the required total load based on the required load and the second correspondence;

[0058] The heating load of the high-temperature heat source providing heating to the fan heat exchanger is adjusted based on the change in the required total load.

[0059] Furthermore, the second temperature difference is the maximum value of the first temperature differences or the average value of the first temperature differences.

[0060] The technical solution of the present invention has the following significant beneficial effects:

[0061] The combined heat supply system provided in the present application is provided with a flow control device between the high-temperature heat source and the low-temperature heat source. By changing the state of the flow control device, it can be achieved that the fluid does not flow between the high-temperature heat source and the low-temperature heat source, thereby ensuring that the high-temperature heat source or the low-temperature heat source of the combined heat supply system can independently, stably and controllably supply heat or cooling to the fan heat exchanger, which is conducive to achieving comprehensive heating effects such as rapid heating, comfort and energy saving, and improving the user experience.

[0062] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby. Within the spirit and scope of the appended claims, the embodiments of the present invention include many variations, modifications, and equivalents. Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0064] Figure 1 This is a schematic structural diagram of the cogeneration system provided in the first embodiment of the present application;

[0065] Figure 2 This is a schematic structural diagram of a cogeneration system provided in a second embodiment of the present application;

[0066] Figure 3 This is a schematic structural diagram of a cogeneration system provided in a third embodiment of the present application;

[0067] Figure 4 This is a schematic structural diagram of a cogeneration system provided in a fourth embodiment of the present application;

[0068] Figure 5 This is a structural diagram of a cogeneration system provided in a fifth embodiment of the present application;

[0069] Figure 6 This is a structural diagram of a cogeneration system provided in a sixth embodiment of the present application;

[0070] Figure 7This is a structural diagram of a cogeneration system provided in a seventh embodiment of the present application;

[0071] Figure 8 This is a schematic structural diagram of a cogeneration system provided in an eighth embodiment of the present application;

[0072] Figure 9 This is a structural diagram of a water channel switching valve in a joint supply system provided in the first embodiment of the present application;

[0073] Figure 10 This is a schematic structural diagram of a combined power supply system provided in a ninth embodiment of the present application;

[0074] Figure 11 This is a structural schematic diagram of a cogeneration system provided in a tenth embodiment of the present application;

[0075] Figure 12 This is a flow chart of the control method steps of the first cogeneration system provided in the embodiment of the present application;

[0076] Figure 13 This is a flow chart of the control method steps of the second cogeneration system provided in an embodiment of the present application;

[0077] Figure 14 This is a flow chart of the control method steps of the third cogeneration system provided in the embodiment of the present application;

[0078] Figure 15 This is a flow chart of some steps in the control method of the cogeneration system provided in the embodiment of the present application.

[0079] Reference numerals in the above drawings:

[0080] 1. High-temperature heat source; 11. First inlet; 12. First outlet; 13. First water inlet pipeline; 14. First return water pipeline; 2. Fan heat exchanger; 3. Low-temperature heat source; 31. Second inlet; 32. Second outlet; 33. First connecting pipeline; 34. Second connecting pipeline; 4. Water channel switching valve; 41. First port; 42. Second port; 43. Third port; 5. One-way valve; 61. First solenoid valve; 62. Second solenoid valve; 63. Third solenoid valve; 7. Heat exchange device; 71. Third connecting pipeline; 72. Fourth connecting pipeline; 74. Fourth solenoid valve; 73. Seventh solenoid valve; 9. Energy storage tank; 91. Water channel switching device; 92. Bypass pipeline. DETAILED DESCRIPTION

[0081] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0082] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementations.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0084] Please refer to the comprehensive Figures 1 to 8 In the embodiment of the present application, a combined heat supply system is provided, which may include: a high-temperature heat source 1, a low-temperature heat source 3, a fan heat exchanger 2, a flow control device, etc. connected by pipelines.

[0085] In this embodiment, the high-temperature heat source 1 can be a device for realizing a heating function. Of course, the high-temperature heat source 1 can also integrate other functions such as supplying domestic hot water. Among them, the functions specifically realized by the high-temperature heat source 1 can be adaptively integrated according to actual needs, and this application does not make specific limitations here. Specifically, the high-temperature heat source 1 can be a gas heating device, such as a water heater, a wall-mounted boiler, etc. In addition, the high-temperature heat source 1 can also be in other forms, such as any one of a solar heating device, an electric heating device, an air energy heating device, etc. In this specification, the high-temperature heat source 1 is mainly introduced by taking a gas heating device, especially a wall-mounted boiler, as an example. Other forms can refer to this form for corresponding equivalent replacement, and this application will not elaborate on it here.

[0086] In this embodiment, the low-temperature heat source 3 can be a device for realizing a heating function. Of course, the low-temperature heat source 3 can also integrate other functions such as refrigeration and domestic hot water supply. Among them, the functions specifically realized by the low-temperature heat source 3 can be adaptively integrated according to actual needs, and this application does not make specific limitations here. Specifically, the low-temperature heat source 3 can be an air energy device, such as a heat pump, air conditioner, etc. In addition, it can also be in other forms, for example, any one of a solar heating device, a gas heating device, an electric heating device, etc. In this specification, the low-temperature heat source 3 is mainly introduced by taking an air energy device as an example. Other forms can refer to this form for corresponding equivalent replacement, and this application will not elaborate on it here.

[0087] In this embodiment, the fan heat exchanger 2 is used to cool or heat indoor air or outdoor mixed air before delivering it to the room, thereby lowering or raising the indoor temperature to meet cooling or heating needs. Specifically, the form of the fan heat exchanger 2 is not specifically limited in this application. For example, the fan heat exchanger 2 may be in the form of a fan coil unit.

[0088] For example, a fan coil unit consists of a fan, radiator, and heat exchange coil. The fan coil unit operates primarily through the forced action of the fan, heating the air as it passes over the heat exchange coil. This enhances the convective heat transfer between the radiator and the air, rapidly heating the air in the room.

[0089] When the fan heat exchanger 2 is used as the terminal heat source, it facilitates rapid heating of the indoor space. This is particularly true when the fan heat exchanger 2 is combined with a high-temperature heat source 1 (such as a wall-mounted boiler). Relatively speaking, the outlet water temperature of the high-temperature heat source 1 is higher than that of the low-temperature heat source 3. When the high-temperature heat source 1 supplies heat to the fan heat exchanger 2, the two work together to raise the room temperature in a shorter time, thereby achieving a rapid heating effect.

[0090] Specifically, when the high-temperature heat source 1 is a gas-fired heating device, the outlet water temperature of the high-temperature heat source 1 is not restricted by the ambient temperature and can be set accordingly according to user needs. When the user sets a higher outlet water temperature, the rapid heating effect during heating can be reliably guaranteed. When the low-temperature heat source 3 is an air energy device, when the air energy device is combined with the fan heat exchanger 2, the energy-saving characteristics of the air energy device can be utilized to achieve energy-saving heating.

[0091] It should be noted in this manual that the water outlet temperatures of the high-temperature heat source 1 and the low-temperature heat source 3 can be set accordingly according to user needs. Different users have different usage requirements. It is not ruled out that in some application scenarios, the user sets the water outlet temperature of the low-temperature heat source 3 to be higher than that of the high-temperature heat source 1. At this time, the two heat sources can be converted into each other, that is, the original high-temperature heat source 1 becomes the low-temperature heat source 3, and the original low-temperature heat source 3 becomes the high-temperature heat source 1.

[0092] In this embodiment, the high-temperature heat source 1 is provided with a first inlet 11 and a first outlet 12. The first outlet 12 can be connected to the water inlet of the fan heat exchanger 2 via a first water inlet pipe. The return water outlet of the fan heat exchanger 2 can be connected to the first inlet 11 via a first return water pipe 14, thereby cooperating with the fan heat exchanger 2 to provide heating to the user.

[0093] In this embodiment, the low-temperature heat source 3 is provided with a second inlet 31 and a second outlet 32. The second inlet 31 is used to be connected to the first return water pipe 14, and the second outlet 32 ​​is used to be connected to the first water inlet pipe 13. Specifically, the second inlet 31 can be connected to the first position of the first return water pipe 14 through the first connecting pipe 33. The second outlet 32 ​​can be connected to the second position of the first water inlet pipe 13 through the second connecting pipe 34. A connection relationship is established between the low-temperature heat source 3 and the fan heat exchanger 2 through the first connecting pipe 33, the second connecting pipe 34 and the common part of the first water inlet pipe 13 and the first return water pipe 14. The pipeline connection is flexible and simple, the pipeline structure is compact, the cost is low, and the user space required is small.

[0094] In addition, the second inlet 31 can also be connected to the first return water pipe 14 through a three-way connection structure, and the second outlet 32 ​​can also be connected to the first water inlet pipe 13 through a three-way connection structure. Alternatively, the communication relationship between the second inlet 31 and the first return water pipe 14 and the second outlet 32 ​​and the first water inlet pipe 13 can be established in other ways.

[0095] In this embodiment, the flow control device is used to control the flow between the high-temperature heat source 1 and the low-temperature heat source 3. Specifically, by adjusting the state of the flow control device, the connection relationship between the high-temperature heat source 1, the low-temperature heat source 3, and the fan heat exchanger 2 can be switched, and the fluid between the high-temperature heat source 1 and the low-temperature heat source 3 is ensured to prevent cross-contamination (especially the shared first water inlet pipe 13 and the first return water pipe 14). This ensures the stability and control accuracy of the heat fluid supplied by a single heat source to the fan heat exchanger 2.

[0096] It should be noted that the flow control device can be used to completely shut off the flow between the high-temperature heat source 1 and the low-temperature heat source 3 during control. Furthermore, the flow control device may not completely shut off the flow between the high-temperature heat source 1 and the low-temperature heat source 3, i.e., a cross-flow between the high-temperature heat source 1 and the low-temperature heat source 3 may exist without affecting the operating parameters of the high-temperature heat source 1 or the low-temperature heat source 3. The embodiments of this specification are primarily described using the embodiment of the flow control device achieving complete flow shutoff as an example.

[0097] In this embodiment, the combined heat supply system has a first mode and / or a second mode. In the first mode, a circulation flow path is formed between a high-temperature heat source 1 (such as a wall-mounted boiler) and a fan heat exchanger 2; in the second mode, a circulation flow path is formed between a low-temperature heat source 3 (such as an air energy device) and the fan heat exchanger 2.

[0098] Specifically, the combined supply system can have at least one mode, and the number and type of the modes can be configured according to the specific functional requirements of the combined supply system. For example, the combined supply system may include a first mode and a second mode. In the first mode, when the high-temperature heat source 1 (such as a wall-mounted boiler) supplies heat to the fan heat exchanger 2, it can realize a rapid heating function. The circulating flow path formed in the first mode can specifically be: the fluid heated by the high-temperature heat source 1 flows out through the first outlet 12, enters the fan heat exchanger 2 through the first water inlet pipe 13 for heat exchange, and then flows back to the high-temperature heat source 1 through the first return water pipe 14 and the first inlet 11. In the second mode, the low-temperature heat source 3 (such as an air energy device) supplies heat to the fan heat exchanger 2, which can realize an energy-saving heating function or a cooling function, etc. The circulation flow formed in the second mode can specifically be: the fluid heated or cooled by the low-temperature heat source 3 flows out through the second outlet 32, enters the fan heat exchanger 2 through the second connecting pipe 34 and the common part first water inlet pipe 13 for heat exchange, and then flows back to the low-temperature heat source 3 through the common part first return pipe 14, the first connecting pipe 33, and the second inlet 31.

[0099] In this embodiment, by switching the state of the flow control device, it is possible to adapt to different operating modes of the combined power supply system. The specific form of the flow control device can be a three-way valve, a combination of a one-way valve 5 and a solenoid valve, or a combination of two solenoid valves. In addition, the flow control device can be a valve with multiple connecting joints, or a combination of multiple valves. Overall, the specific form of the flow control device can be selected based on the pipeline connection and the functional requirements of the combined power supply system.

[0100] The flow control device will be described below in different forms and different installation positions using different implementation methods in conjunction with the accompanying drawings.

[0101] like Figure 1 or Figure 2 As shown, in the first embodiment or the second embodiment, the flow control device can be a water channel switching valve 4 set at the first position or the second position.

[0102] In the first embodiment, please refer to Figure 1 and Figure 9 The water channel switching valve 4 may include a first port 41, a second port 42 and a third port 43. The first port 41 and the second port 42 are respectively connected to the first return water pipe 14, and the third port 43 is connected to the first connecting pipe 33. The first port 41 is located upstream of the second port 42.

[0103] The waterway switching valve 4 has a first state and a second state. When the waterway switching valve 4 is in the first state, the first port 41 and the second port 42 are connected, and the combined supply system can be in the first mode. When the waterway switching valve 4 is in the second state, the first port 41 and the third port 43 are connected, and the combined supply system can be in the second mode.

[0104] In this embodiment, the working mode of the combined heat supply system can be changed by simply switching the state of the water circuit switching valve 4, without frequently starting and stopping the high-temperature heat source 1 and the low-temperature heat source 3. Moreover, when the water circuit switching valve 4 is in the first position, when the water circuit switching valve 4 is switched, the flow direction of the fluid flowing out of the first return water pipe 14 can be smoothly changed by only changing the connectivity relationship of its ports, thereby realizing switching between different modes of the combined heat supply system.

[0105] In the second embodiment, please refer to Figure 2 and Figure 9 The water channel switching valve 4 may include a first port 41, a second port 42 and a third port 43. The first port 41 and the second port 42 are respectively connected to the first water inlet pipe 13, and the third port 43 is connected to the second connecting pipe 34. The first port 41 is located upstream of the second port 42.

[0106] The water channel switching valve 4 has a first state and a second state. When the water channel switching valve 4 is in the first state, the first port 41 and the second port 42 are connected, and the combined supply system can be in the first mode. When the water channel switching valve 4 is in the second state, the second port 42 and the third port 43 are connected, and the combined supply system can be in the second mode.

[0107] In this embodiment, the operating mode of the combined heat supply system can be changed by simply switching the state of the water circuit switching valve 4, without the need to frequently start and stop the high-temperature heat source 1 and the low-temperature heat source 3. When the water circuit switching valve 4 is in the second position, the connection relationship between different heat sources and the portion of the first water inlet pipe 13 can be selected by simply changing the connection relationship of its ports during switching, thereby achieving mode switching. The portion of the first water inlet pipe 13 is the water inlet pipe between the second position and the fan heat exchanger 2.

[0108] like Figure 3 or Figure 4 As shown, in the third embodiment or the fourth embodiment, the flow control device includes a first solenoid valve 61 and a second solenoid valve 62 .

[0109] See also Figure 3 The first solenoid valve 61 is arranged in the second connecting pipeline 34 , and the second solenoid valve 62 is arranged in the first part of the first water inlet pipeline 13 , and the first part of the pipeline is located between the second position and the first outlet 12 .

[0110] In this embodiment, the combination of the first solenoid valve 61 and the second solenoid valve 62 is equivalent to the water channel switching valve 4 in the second embodiment. When the first solenoid valve 61 is closed and the second solenoid valve 62 is open, the combined power supply system is in the first mode. When the first solenoid valve 61 is open and the second solenoid valve 62 is closed, the combined power supply system is in the second mode.

[0111] See also Figure 4 The first solenoid valve 61 is arranged in the first connecting pipeline 33 , and the second solenoid valve 62 is arranged in the second part of the first return pipeline 14 , and the second part of the pipeline is located between the first position and the first inlet 11 .

[0112] In this embodiment, the combination of the first solenoid valve 61 and the second solenoid valve 62 is equivalent to the water channel switching valve 4 in the first embodiment. When the first solenoid valve 61 is closed and the second solenoid valve 62 is open, the combined power supply system is in the first mode. When the first solenoid valve 61 is open and the second solenoid valve 62 is closed, the combined power supply system is in the second mode.

[0113] like Figures 5 to 8 As shown, in the fifth to eighth embodiments, the flow control device includes a third solenoid valve 63 and a one-way valve 5 .

[0114] See also Figure 5 In the fifth embodiment, the one-way valve 5 is arranged on the second connecting pipeline 34, and the third solenoid valve 63 is arranged in the first part of the pipeline in the first water inlet pipeline 13, and the first part of the pipeline is located between the second position and the first outlet 12.

[0115] In this embodiment, the one-way valve 5 can be set on the second connecting pipeline 34, so that the fluid cannot flow into the low-temperature heat source 3 through the second connecting pipeline 34 and the second outlet 32. The third solenoid valve 63 is set in the first part of the first water inlet pipeline 13. When the third solenoid valve 63 is in the open state, the low-temperature heat source 3 can be started first, and the high-temperature heat source 1 can supply heat to the fan heat exchanger 2. When the high-temperature heat source 1 supplies heat to the fan heat exchanger 2, the fluid flowing out of the high-temperature heat source 1 will not flow into the low-temperature heat source 3 due to the one-way conduction effect of the one-way valve 5. At this time, the cogeneration system is in the first mode. When the third solenoid valve 63 is in the closed state and the low-temperature heat source 3 is started, the low-temperature heat source 3 supplies heat to the fan heat exchanger 2. When the low-temperature heat source 3 is supplying heat to the fan heat exchanger 2, the fluid flowing out of the low-temperature heat source 3, after exchanging heat with the fan heat exchanger 2, will not flow into the high-temperature heat source 1 during its return to the low-temperature heat source 3 because the third solenoid valve 63 is closed. At this time, the cogeneration system is in the second mode.

[0116] See also Figure 6 In the sixth embodiment, the one-way valve 5 is provided on the second connecting pipe 34 , and the third solenoid valve 63 is provided in the second portion of the first return pipe 14 . The second portion of the pipe is located between the first position and the first inlet 11 .

[0117] In this embodiment, the one-way valve 5 can be set on the second connecting pipeline 34, so that the fluid cannot flow into the low-temperature heat source 3 through the second connecting pipeline 34 and the second outlet 32. The third solenoid valve 63 is set in the second part of the first return water pipeline 14. When the third solenoid valve 63 is in the open state, the low-temperature heat source 3 can be started first, and the high-temperature heat source 1 can supply heat to the fan heat exchanger 2. When the high-temperature heat source 1 supplies heat to the fan heat exchanger 2, the fluid flowing out of the high-temperature heat source 1 will not flow into the low-temperature heat source 3 due to the one-way conduction effect of the one-way valve 5. At this time, the cogeneration system is in the first mode. When the third solenoid valve 63 is in the closed state and the low-temperature heat source 3 is started, the low-temperature heat source 3 supplies heat to the fan heat exchanger 2. When the low-temperature heat source 3 supplies heat to the fan heat exchanger 2, the fluid flowing out of the low-temperature heat source 3, after exchanging heat with the fan heat exchanger 2, will not flow into the high-temperature heat source 1 during its return to the low-temperature heat source 3 because the third solenoid valve 63 is in the closed state. At this time, the cogeneration system is in the second mode.

[0118] See also Figure 7 In the seventh embodiment, the one-way valve 5 is provided in the first portion of the first water inlet pipe 13 , the first portion of the pipe being located between the second position and the first outlet 12 . The third solenoid valve 63 is provided in the first connecting pipe 33 .

[0119] In this embodiment, the one-way valve 5 can be set in the first part of the first water inlet pipeline 13, and the first part of the pipeline is between the second position and the first outlet 12. By setting the one-way valve 5, the fluid can be prevented from flowing into the high-temperature heat source 1 through the first water inlet pipeline 13. The third solenoid valve 63 can be set in the first connecting pipeline 33. When the third solenoid valve 63 is in the closed state, the high-temperature heat source 1 supplies heat to the fan heat exchanger 2. Since the third solenoid valve 63 is in the closed state, the fluid flowing out of the high-temperature heat source 1 will not flow into the low-temperature heat source 3. At this time, the combined heat supply system is in the first mode. When the third solenoid valve 63 is in the open state, the high-temperature heat source 1 can be in the closed state. At this time, the low-temperature heat source 3 is started to supply heat to the fan heat exchanger 2, and the combined heat supply system enters the second mode.

[0120] See also Figure 8 In the eighth embodiment, the one-way valve 5 is disposed in the first portion of the first water inlet pipe 13 , which is located between the second position and the first outlet 12 . The third solenoid valve 63 is disposed in the second connecting pipe 34 .

[0121] In this embodiment, the one-way valve 5 can be set in the first part of the first water inlet pipe 13, and the first part of the pipe is between the second position and the first outlet 12. By setting the one-way valve 5, the fluid can be prevented from flowing into the high-temperature heat source 1 through the first water inlet pipe. The third solenoid valve 63 can be set in the second connecting pipe 34. When the third solenoid valve 63 is in the closed state, the high-temperature heat source 1 supplies heat to the fan heat exchanger 2. The fluid flowing out of the high-temperature heat source 1 will not flow into the low-temperature heat source 3 because the third solenoid valve 63 is in the closed state. At this time, the combined heat supply system is in the first mode. When the third solenoid valve 63 is in the open state, the high-temperature heat source 1 can be in the closed state. At this time, the low-temperature heat source 3 is started to supply heat to the fan heat exchanger 2, and the combined heat supply system enters the second mode.

[0122] Based on the examples of the above embodiments in this specification, the specific combination, position and arrangement of the flow control device can also be selected based on the above embodiments. For example, in some other embodiments, based on the above third embodiment, the position of the second solenoid valve 62 can be changed to form a ninth embodiment.

[0123] In this embodiment, the first solenoid valve 61 may be disposed in the second connecting pipeline 34 , while the second solenoid valve 62 is disposed in the second portion of the first return pipeline 14 , the second portion being located between the first position and the first inlet 11 .

[0124] When the first solenoid valve 61 is in the closed state and the second solenoid valve 62 is in the open state, the high-temperature heat source 1 is used to supply heat to the fan heat exchanger 2, and the combined heat supply system is in the first mode; when the first solenoid valve 61 is in the open state and the second solenoid valve 62 is in the closed state, the low-temperature heat source 3 is used to supply heat to the fan heat exchanger 2, and the combined heat supply system is in the second mode.

[0125] Furthermore, based on the fourth embodiment, the position of the second electromagnetic valve 62 may be changed to form a tenth embodiment.

[0126] In this embodiment, the first solenoid valve 61 is disposed in the first connecting pipeline 33 , and the second solenoid valve 62 is disposed in the first portion of the first water inlet pipeline 13 , which is located between the second position and the first outlet 12 .

[0127] When the first solenoid valve 61 is in the closed state and the second solenoid valve 62 is in the open state, the high-temperature heat source 1 is used to supply heat to the fan heat exchanger 2, and the combined heat supply system is in the first mode; when the first solenoid valve 61 is in the open state and the second solenoid valve 62 is in the closed state, the low-temperature heat source 3 is used to supply heat to the fan heat exchanger 2, and the combined heat supply system is in the second mode.

[0128] The combined heat supply system provided in this specification has a flow control device provided between the high-temperature heat source 1 and the low-temperature heat source 3. By changing the state of the flow control device, it can be achieved that the fluid does not flow between the high-temperature heat source 1 and the low-temperature heat source 3, thereby ensuring that the high-temperature heat source 1 or the low-temperature heat source 3 of the combined heat supply system can independently, stably and controllably supply heat or cooling to the fan heat exchanger 2, which is conducive to achieving comprehensive heating effects such as rapid heating, comfort and energy saving, and improving the user experience.

[0129] Please refer to Figure 10 and Figure 11 In some embodiments, the combined power supply system may further include a heat exchange device 7 . The outlet of the heat exchange device 7 is connected to the first connecting pipeline 33 via a third connecting pipeline 71 ; the inlet of the heat exchange device 7 is connected to the second connecting pipeline 34 via a fourth connecting pipeline 72 .

[0130] In this embodiment, the specific form of the heat exchange device 7 is not limited depending on the heat exchange principle. Specifically, the heat exchange device 7 may include any one of the following or a combination thereof: a fan heat exchanger, a radiation heat exchanger. When the heat exchange device 7 is a radiation heat exchanger, the radiation heat exchanger may be in the form of a heat sink, or in the form of floor heating, or a combination of the two. In the embodiments of this specification, the heat exchange device 7 is mainly introduced in the form of floor heating. Other forms can be adaptively compared and referenced, and this application does not elaborate on them here.

[0131] In this embodiment, the heat exchange device 7 can be used to coordinate with the high-temperature heat source 1 or the low-temperature heat source 3 by switching the on / off relationship of the pipeline, thereby independently providing heating or cooling to the user. In addition, by providing the heat exchange device 7, the high-temperature heat source 1 and the low-temperature heat source 3 can be freely paired and combined to select a fan heat exchanger 2 and the heat exchange device 7, and the two can independently provide heat to achieve the technical effect of dual-effect rapid heating.

[0132] To achieve optimal rapid heating when high-temperature heat source 1 and low-temperature heat source 3 independently provide heat, the heat exchange efficiency of fan heat exchanger 2 can be higher than that of heat exchange device 7. When the combined heat supply system is in the first mode, high-temperature heat source 1 supplies heat to fan heat exchanger 2 with higher heat exchange efficiency, while low-temperature heat source 3 supplies heat to heat exchange device 7 with lower heat exchange efficiency, which helps to quickly increase the room temperature and achieve the ideal rapid heating effect.

[0133] Experimental verification has shown that in the same space, when the combined heating system is used for heating through the above-mentioned combined heating mode, for example, in the above-mentioned combined heating mode, the wall-mounted boiler is simultaneously supplying heat to the fan coil unit and the heat pump is simultaneously supplying heat to the floor heating. For the same space, it only takes 8.5 minutes for the space temperature to rise from 5°C to 22°C. When heating is performed using the method in the prior art, it takes at least 30 minutes to achieve the same temperature rise for the same space.

[0134] This specification primarily uses the example of a high-temperature heat source 1 supplying heat to a fan heat exchanger 2 with high heat exchange efficiency, and a low-temperature heat source 3 supplying heat to a heat exchanger 7 with lower heat exchange efficiency. However, other scenarios, such as a high-temperature heat source 1 supplying heat to a fan heat exchanger 2 with lower heat exchange efficiency, and a low-temperature heat source 3 supplying heat to a heat exchanger 7 with higher heat exchange efficiency, can also achieve rapid heating. The difference between the two scenarios may lie in a slight difference in the time it takes to heat up.

[0135] In one embodiment, the flow control device is arranged at a third position where the third connecting line 71 is connected to the first connecting line 33, or is arranged on the third portion of the line, or is arranged at a fourth position where the first connecting line 33 is connected to the first return water line 14; the third portion of the line is located between the third position and the fourth position.

[0136] Specifically, the specific form of the flow control device may include any one of the following: a waterway switching valve 4 set at the third position or the fourth position, such as Figure 10 provided on the third portion of the pipeline on the fourth solenoid valve 74, as shown Figure 11 shown.

[0137] In this embodiment, the flow control device can be configured in different forms depending on its location. Specifically, when the flow control device is configured at a node where multiple pipelines are connected, the flow control device can be in the form of a waterway switching valve 4; when the flow control device is configured in a single pipeline, it can be in the form of a solenoid valve.

[0138] In an implementation scenario, when the flow control device blocks the third part of the pipeline, taking the simultaneous heating of the high-temperature heat source 1 and the low-temperature heat source 3 as an example, since the third part of the pipeline is blocked by the flow control device, the high-temperature heat source 1 independently supplies heat to the fan heat exchanger 2, and the low-temperature heat source 3 independently supplies heat to the heat exchanger 7, that is, the two different heat sources independently supply heat to their respective heat exchangers, and there will be no mutual interference between the fluids in the pipelines. Not only can the effect of double-effect rapid heating be achieved, but the flow rate can also be adaptively controlled according to the different heating capacities of the heat exchangers, which is conducive to more rational use of the characteristics of each heat source for precise regulation, thereby achieving comprehensive heating effects such as rapid heating, comfort and energy saving, and improving the user experience.

[0139] In one embodiment, a one-way valve or a fifth solenoid valve is provided between the second connecting line 34 and the first outlet 12 of the low-temperature heat source 3 .

[0140] When a one-way valve is provided between the second connecting pipeline 34 and the first outlet 12 of the low-temperature heat source 3, the fluid flowing out of the first outlet 12 of the high-temperature heat source 1 can flow out of the pipeline through the one-way valve; on the contrary, when the fluid in the pipeline where the one-way valve is located flows in the reverse direction, it can be cut off by the one-way valve and cannot flow to the high-temperature heat source 1 through the one-way valve. Specifically, by utilizing the one-way cut-off characteristic of the one-way valve, it can be ensured that when the low-temperature heat source 3 is providing heat, the fluid will not flow into the high-temperature heat source 1. Alternatively, when the one-way valve is replaced with a fifth solenoid valve, when the fifth solenoid valve is in a closed state, the low-temperature heat source 3 can cooperate with the fan heat exchanger 2 or the heat exchange device 7 to achieve cooling and heating. During the cooling or heating process, due to the action of the one-way valve or the fifth solenoid valve, the fluid will not flow into the high-temperature heat source 1.

[0141] In one embodiment, a one-way valve or a sixth solenoid valve is provided on the second connecting line 34 .

[0142] When a one-way valve is provided in the second connecting pipeline 34, the fluid flowing out of the second outlet 32 ​​of the low-temperature heat source 3 can flow out of the pipeline through the one-way valve. On the contrary, when the fluid in the second connecting pipeline 34 flows in the reverse direction, it can be cut off by the one-way valve and cannot flow into the low-temperature heat source 3 through the one-way valve. Specifically, by utilizing the one-way cut-off characteristic of the one-way valve, it can be ensured that when the high-temperature heat source 1 is providing heat, the fluid will not flow into the low-temperature heat source 3. Or when the one-way valve is replaced with the sixth solenoid valve, the sixth solenoid valve is in a closed state, and the high-temperature heat source 1 cooperates with the fan heat exchanger 2 or the heat exchange device 7 to achieve cooling and heating. During the cooling or heating process, due to the action of the one-way valve or the sixth solenoid valve, the fluid will not flow into the low-temperature heat source 3.

[0143] In one embodiment, a one-way valve or a seventh solenoid valve 73 is provided on the third connecting line 71 or the fourth connecting line 72 .

[0144] In this embodiment, in order to prevent fluid from flowing into the heat exchange device 7 when the low-temperature heat source 3 cooperates with the fan heat exchanger 2 to perform cooling or heating, a one-way valve or a seventh solenoid valve 73 is provided on the third connecting pipe 71 or the fourth connecting pipe 72.

[0145] Among them, when a one-way valve is provided on the third connecting line 71 or the fourth connecting line 72, the one-way valve allows the fluid to flow from the fourth connecting line 72 into the heat exchange device 7 and then flow out from the third connecting line 71, without restricting the reverse flow of the reverse fluid. This ensures that when the low-temperature heat source 3 and the fan heat exchanger 2 work in conjunction with each other, the fluid will not flow from the third connecting line 71 to the heat exchange device 7 after passing through the connection position between the third connecting line 71 and the first connecting line 33. In addition, the one-way valve can also be replaced with a seventh solenoid valve 73. When the seventh solenoid valve 73 is in a closed state, it can prevent the fluid from flowing through the third connecting line 71 to the heat exchange device 7, thereby preventing the fluid from entering the heat exchange device 7.

[0146] In some embodiments, manifolds can be installed at the water inlet and outlet of the heat exchanger 7. Generally, manifolds have the function of opening and closing fluids. In this case, the seventh solenoid valve 73 can be in the form of a manifold. Furthermore, to ensure reliable fluid control, a one-way valve or solenoid valve can also be installed in scenarios where a manifold is installed.

[0147] In one embodiment, an energy storage water tank 9 may also be provided on the second connecting pipe 34 .

[0148] In this embodiment, by setting an energy storage water tank 9 in the second water inlet pipe, the energy storage water tank 9 can serve as an energy storage and replenishment device for the low-temperature heat source 3. When there is surplus energy in the combined supply system, the excess energy can be stored in the energy storage water tank 9. When the energy required in the combined supply system is greater than the current supply energy of the low-temperature heat source 3, the energy stored in the energy storage water tank 9 can be released to fill the difference between supply and demand.

[0149] Specifically, the energy storage tank 9 can be installed in the water inlet pipe between the second outlet 32 ​​and the connection point between the second connecting pipe 34 and the second water inlet pipe. When the energy storage tank 9 is installed in this position, it can store or replenish energy when the low-temperature heat source 3 cooperates with the fan heat exchanger 2 to achieve heating or cooling, and can also store or replenish energy when the low-temperature heat source 3 and the heat exchange device 7 achieve heating or cooling.

[0150] Furthermore, a bypass pipeline 92 for bypassing the energy storage water tank 9 may be provided on the second connecting pipeline 34 .

[0151] Specifically, a waterway switching device 91 may be provided on the second water inlet pipe between the second inlet 31 and the energy storage water tank 9. The first and second ends of the waterway switching device 91 are respectively connected to the second water inlet pipe, and the third end is connected to the second connecting pipe 34 via a bypass pipe 92.

[0152] When the water channel switching device 91 is installed on the second water inlet pipe at this position, and the third section of the water channel switching device 91 is connected to the second connecting pipe 34 via the bypass pipe 92, it is possible to flexibly control whether to connect to the energy storage tank 9 according to actual operating conditions. Specifically, when the third end is connected to the bypass pipe 92 and the second end is not connected to the energy storage tank 9, the fluid flowing out of the low-temperature heat source 3 is supplied to the fan heat exchanger 2 or the heat exchange device 7 through the bypass pipe 92, and no fluid passes through the energy storage tank 9. When the third end is not connected to the bypass pipe 92, and the first end and the second end are connected to the energy storage tank 9, the fluid flowing out of the low-temperature heat source 3 first passes through the energy storage tank 9 to store energy before being supplied to the fan heat exchanger 2 or the heat exchange device 7.

[0153] In a practical application scenario, for example, when the combined heat and power supply system is first turned on, the user generally expects the indoor ambient temperature to quickly reach the set temperature. In this case, bypass line 92 can be used to operate, while short-circuiting the energy storage tank 9. When the indoor ambient temperature has reached the set temperature and the combined heat and power supply system has surplus energy, bypass line 92 can be closed, and the energy storage tank 9 can be connected to store energy. The energy released in the energy storage tank 9 is then supplied to the fan heat exchanger 2 or heat exchange device 7. This not only saves energy but also avoids frequent starts and stops of the machine, extending the service life of the entire machine.

[0154] In one embodiment, the combined heat supply system further includes a hot water tank, and the high-temperature heat source 1 and / or the low-temperature heat source 3 are connected to the hot water tank for supplying hot water to the hot water tank.

[0155] In this embodiment, at least one of the high-temperature heat source 1 and the low-temperature heat source 3 may be provided with a hot water outlet for supplying hot water. This hot water outlet can provide hot water to the user. Specifically, this hot water outlet can be connected to a hot water tank. Hot water heated by at least one of the high-temperature heat source 1 and the low-temperature heat source 3 can be stored in the hot water tank. When the user needs hot water, the hot water tank can supply the user with hot water.

[0156] Please refer to Figure 12 Based on the combined heat supply system provided in the above embodiment, this application also provides a control method for the combined heat supply system. The combined heat supply system includes a high-temperature heat source 1, a low-temperature heat source 3, a flow control device, and a fan heat exchanger 2. The control method includes the following steps:

[0157] Step S10: obtaining a user-set temperature and an indoor temperature of the indoor space where each fan heat exchanger 2 in the working state is located, and obtaining a first temperature difference based on the user-set temperature and the indoor temperature;

[0158] Step S12: determining a second temperature difference of the space where the combined heat supply system is located based on the first temperature difference obtained in the indoor space where each fan heat exchanger 2 in the working state is located;

[0159] Step S13: When the second temperature difference is greater than the first temperature difference threshold, the flow control device is controlled to be in the first state, so that the high-temperature heat source 1 provides heat to the fan heat exchanger 2.

[0160] In this embodiment, the combined heat supply system includes core components such as a high-temperature heat source 1, a low-temperature heat source 3, a flow control device, and a fan heat exchanger 2. Furthermore, the system may include hardware or software for intelligent control. This hardware or software may be integrated into a controller, for example, in the form of a circuit board. Alternatively, it may be integrated into a specific component, though this application does not provide specific limitations. The following embodiments will primarily illustrate the controller as an example.

[0161] In a specific application scenario, when a user demands heating, they can activate the fan heat exchanger 2 in the desired room through a remote control, app settings, or a button trigger. Upon receiving the trigger signal to activate the fan heat exchanger 2, the controller obtains the temperature signal from the temperature sensor in the indoor space where the fan heat exchanger 2 is located, thereby obtaining the indoor temperature of each indoor space where the fan heat exchanger 2 is in operation. Simultaneously, the controller can also obtain the user-set temperature for the fan heat exchanger 2 in the indoor space. After obtaining the indoor temperature and the user-set temperature, the difference between the two can be calculated to obtain a first temperature difference.

[0162] After obtaining a first temperature difference for each indoor space requiring heating, a second temperature difference for the space where the combined heating system is located can be determined based on the first temperature difference. The second temperature difference can be the maximum value among the first temperature differences, or the average of the first temperature differences, or can be derived by substituting the first temperature differences into a preset calculation model. The preset calculation model can be a self-learning model or other model, and this application does not impose specific limitations thereon.

[0163] The controller of the combined heat supply system may store a first temperature threshold. After determining the second temperature difference, the second temperature difference may be compared with the first temperature threshold. If the second temperature difference is greater than the first temperature threshold, indicating a high heating demand in the indoor space, the flow control device may be controlled to the first state, causing the high-temperature heat source 1 to provide heat to the fan heat exchanger 2. The first temperature threshold may be measured based on multiple sets of experiments before the product leaves the factory, or may be set based on local conditions and user needs. This application does not specifically limit its value.

[0164] In this embodiment, in order to achieve intelligent energy saving during operation of the combined power supply system, when the second temperature difference is not greater than the first temperature difference threshold, the control method may further include the following steps:

[0165] Step S14: determining a first heating fee required for heating based on the high-temperature heat source 1 and a second heating fee required for heating based on the low-temperature heat source 3 when preparing the same amount of heat;

[0166] Step S16: Based on the first heating fee and the second heating fee, it is determined whether it is necessary to switch the heating from the high-temperature heat source 1 to the low-temperature heat source 3 .

[0167] In one embodiment, when the high-temperature heat source 1 is a gas heating device, determining the first heating fee includes:

[0168] Obtain the gas price and first energy efficiency of gas heating devices in the geographical area where the cogeneration system is located;

[0169] Based on the gas price and the first energy efficiency, a first heating fee required by the gas heating device to prepare the same amount of heat is determined.

[0170] When the low-temperature heat source 3 is an air energy device, the combined heat supply system stores a first correspondence between the ambient temperature, heating load, and overall energy efficiency of the air energy device, and determines the second heating fee including:

[0171] Obtain the outdoor ambient temperature at the installation location of the CPG system, the electricity price in the geographical area, and the total required load;

[0172] determining a second energy efficiency of the air energy device based on the ambient temperature, the required total load, and the first corresponding relationship;

[0173] Based on the electricity price and the second energy efficiency, the second heating cost required by the air energy device to prepare the same amount of heat is determined.

[0174] After the first heating cost and the second heating cost are calculated, the control method includes: step S162: when the first heating cost is greater than the second heating cost, the flow control device is controlled to be in the second state, and the low-temperature heat source 3 provides heating to the fan heat exchanger 2, thereby achieving the effect of energy-saving heating and low-cost heating.

[0175] Step S161: When the first heating cost is not greater than the second heating cost, high-temperature heat source 1 can be maintained to provide heating to fan heat exchanger 2. At this point, as the indoor temperature rises, the fan speed of fan heat exchanger 2 can be gradually reduced, thereby achieving a comprehensive heating effect of energy-saving and low-cost heating.

[0176] See also Figure 13 In some embodiments, the control method further includes step S15: when the second temperature difference is not greater than the first temperature difference threshold, controlling the flow control device to be in the second state, and the low-temperature heat source 3 provides heating to the fan heat exchanger 2.

[0177] In this embodiment, when the second temperature difference is not greater than the first temperature difference threshold, the controller does not perform the cost judgment in the aforementioned embodiment, and directly controls the flow control device to be in the second state, and the low-temperature heat source 3 provides heating to the fan heat exchanger 2.

[0178] Specifically, after the combined heat supply system operates in the second mode of supplying heat to the fan heat exchanger 2 with the low-temperature heat source 3 for a period of time, when it is identified through temperature detection that the second temperature difference is greater than the first temperature difference threshold, the control method may further include: controlling the flow control device to be in the first state, and re-supplying heating to the fan heat exchanger 2 by the high-temperature heat source 1, thereby ensuring the user's heating needs.

[0179] See also Figure 14 In some embodiments, the control method may further include step S17: when the second temperature difference is not greater than the first temperature difference threshold, maintaining the high-temperature heat source 1 to heat the fan heat exchanger 2. That is, when the temperature of the indoor space rises, it may reach the set temperature condition, and it is necessary to switch from the high-temperature heat source 1 to the low-temperature heat source 3 for heating. For this scenario, the combined heat supply system provided by the present application can be flexibly selected according to the needs of the user. When the user chooses not to switch the heat source, the controller can maintain the high-temperature heat source 1 to heat the fan heat exchanger 2. For this scenario, the fan speed of the fan heat exchanger 2 can be controlled based on the first temperature difference, thereby achieving the purpose of energy-saving heating and noise-reducing comfortable heating.

[0180] When specifically regulating the fan speed of the fan heat exchanger 2, when the temperature difference in the indoor space where the fan heat exchanger 2 is located is relatively small, for example, when it reaches a certain set value, the fan speed can be adaptively reduced based on the current fan speed as the first temperature difference gradually decreases. Alternatively, the current fan speed can be maintained for a period of time to ensure that the air temperature in the indoor space where the fan heat exchanger 2 is located is relatively uniform, and then the fan speed can be adaptively reduced as the first temperature difference gradually decreases.

[0181] In other scenarios, when it is necessary to control the fan speed of fan heat exchanger 2 based on the first temperature difference, controlling the fan speed of fan heat exchanger 2 may also include any of the following: reducing the fan speed, or initially keeping the speed constant and then reducing the speed. Specifically, the adjustment process can be referred to the detailed description of the above embodiment, and this application will not elaborate on it here.

[0182] See also Figure 15 In one embodiment, in order to ensure that when the high-temperature heat source 1 provides heat, the combined heat supply system can also ensure the heating comfort of the user and achieve energy-saving heating, the method may further include the following steps:

[0183] Step S21: determining the required load based on the first temperature difference;

[0184] Step S22: the combined power supply system stores a second correspondence between the required load and the required total load;

[0185] Step S23: determining the required total load based on the required load and the second corresponding relationship;

[0186] Step S24: adjusting the heating load of the high-temperature heat source 1 supplying heating to the fan heat exchanger 2 based on the change in the required total load.

[0187] In this embodiment, to achieve the aforementioned comfortable and energy-saving heating objectives, load adjustment can be performed during heating by the high-temperature heat source 1. Specifically, the required load can be determined based on the temperature difference of each indoor space. Once the required load is determined, the required load can be substituted into a second correspondence between the required load and the required total load. This second correspondence can be a mapping relationship in which each required load is summed to obtain the required total load, or it can be another mapping relationship established between the required load and the required total load. Specifically, this application is not intended to be limiting.

[0188] After determining the required total load, the controller can adaptively adjust the heating load of the high-temperature heat source 1 supplying heat to the fan heat exchanger 2 based on the change in the required total load. Generally speaking, the heating load decreases as the required total load decreases and increases as the total load increases.

[0189] It should be noted that, in the description of this application, the terms "first," "second," etc., are used solely for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, nor should they be understood to indicate or imply relative importance. Furthermore, in the description of this application, unless otherwise specified, "plurality" means two or more.

[0190] The above-mentioned various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0191] The above are only a few embodiments of the present invention. Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art of the present invention may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in the present invention. However, the scope of patent protection of the present invention shall still be based on the scope defined by the appended claims.

Claims

1. A combined power supply system, characterized in that: include: A high-temperature heat source and a low-temperature heat source, wherein the outlet water temperature of the high-temperature heat source is greater than the outlet water temperature of the low-temperature heat source, the high-temperature heat source comprises any one of a gas heating device, a solar heating device, an electric heating device, and an air heating device, and the low-temperature heat source comprises any one of a gas heating device, a solar heating device, an electric heating device, and an air heating device; The high-temperature heat source is provided with a first inlet and a first outlet, the first outlet is used to be connected to the water inlet of the fan heat exchanger through a first water inlet pipeline, and the first inlet is used to be connected to the return outlet of the fan heat exchanger through a first return water pipeline; The low-temperature heat source is provided with a second inlet and a second outlet, the second inlet is used to be connected to the first return water pipeline, the second outlet is used to be connected to the first water inlet pipeline, the second inlet is connected to the first position of the first return water pipeline through a first connecting pipeline or a three-way connection structure, and the second outlet is connected to the second position of the first water inlet pipeline through a second connecting pipeline or a three-way connection structure; a flow control device for controlling the flow between the high-temperature heat source and the low-temperature heat source; The flow control device includes: a waterway switching valve arranged at the first position or the second position, or a first solenoid valve and a second solenoid valve, or a third solenoid valve and a one-way valve; When the flow control device includes a water path switching valve set at the first position or the second position, and when the second inlet is connected to the first position of the first return water pipeline through the first connecting pipeline, and the second outlet is connected to the second position of the first water inlet pipeline through the second connecting pipeline, the water path switching valve includes a first port, a second port and a third port, the first port and the second port are respectively connected to the first return water pipeline, the third port is connected to the first connecting pipeline, and the first port is located upstream of the second port, the water path switching valve has a first state and a second state, when the water path switching valve is in the first state, the first port and the second port are connected, when the water path switching valve is in the second state, the first port and the third port are connected, or the first port and the second port are respectively connected to the first return water pipeline, the third port is connected to the first connecting pipeline, and the first port is located upstream of the second port, the water path switching valve has a first state and a second state, when the water path switching valve is in the first state, the first port and the second port are connected, when the water path switching valve is in the second state, the first port and the third port are connected; When the flow control device includes a first solenoid valve and a second solenoid valve, and when the second inlet is connected to the first position of the first return pipe through the first connecting pipe, and the second outlet is connected to the second position of the first inlet pipe through the second connecting pipe, the first solenoid valve is arranged in the second connecting pipe, the second solenoid valve is arranged in the first part of the first inlet pipe, or the second solenoid valve is arranged in the second part of the first return pipe, the first part of the pipe is located between the second position and the first outlet, and the second part of the pipe is located between the first position and the first inlet, or the first solenoid valve is arranged in the first connecting pipe, the second solenoid valve is arranged in the second part of the first return pipe, or the second solenoid valve is arranged in the first part of the first inlet pipe, the second part of the pipe is located between the first position and the first inlet, and the first part of the pipe is located between the second position and the first outlet; When the flow control device includes a third solenoid valve and a one-way valve, and when the second inlet is connected to the first position of the first return water pipe through the first connecting pipe, and the second outlet is connected to the second position of the first water inlet pipe through the second connecting pipe, the one-way valve is arranged on the second connecting pipe, the third solenoid valve is arranged in the second part of the pipe in the first return water pipe or in the first part of the pipe in the first water inlet pipe, the first part of the pipe is located between the second position and the first outlet, and the second part of the pipe is located between the first position and the first inlet, or, the one-way valve is arranged in the first part of the pipe of the first water inlet pipe, the third solenoid valve is arranged in the first connecting pipe or the second connecting pipe, and the first part of the pipe is located between the second position and the first outlet.

2. The combined power supply system according to claim 1, wherein: The cogeneration system has a first mode and / or a second mode, wherein in the first mode, a circulation flow path is formed between the high-temperature heat source and the fan heat exchanger; In the second mode, a circulation flow path is formed between the low-temperature heat source and the fan heat exchanger.

3. The combined power supply system according to claim 2, wherein: The flow control device is used to shut off the flow between the high-temperature heat source and the low-temperature heat source.

4. The combined power supply system according to claim 1, wherein: Also included is a heat exchange device; The outlet of the heat exchange device is used to be connected to the first connecting pipeline through a third connecting pipeline; The inlet of the heat exchange device is used to be connected to the second connecting pipeline through a fourth connecting pipeline.

5. The combined power supply system according to claim 4, wherein: The flow control device is arranged at a third position where the third connecting pipeline is connected to the first connecting pipeline, or on a third portion of the pipeline, or at a fourth position where the first connecting pipeline is connected to the first return water pipeline; the third portion of the pipeline is located between the third position and the fourth position.

6. The combined power supply system according to claim 5, characterized in that: The flow control device includes any one of the following: a waterway switching valve provided at the third position or the fourth position; A fourth solenoid valve is provided on the third portion of the pipeline.

7. The combined power supply system according to claim 6, wherein: A one-way valve or a fifth solenoid valve is provided between the second connecting pipeline and the first outlet of the high-temperature heat source.

8. The combined power supply system according to claim 6, wherein: A one-way valve or a sixth solenoid valve is provided on the second connecting pipeline.

9. The combined power supply system according to claim 6, wherein: A one-way valve or a seventh solenoid valve is provided on the third connecting pipeline or the fourth connecting pipeline.

10. The combined power supply system according to claim 4, wherein: An energy storage water tank is provided on the second connecting pipeline.

11. The combined power supply system according to claim 10, wherein: A bypass pipeline for bypassing the energy storage water tank is also provided on the second connecting pipeline.

12. The combined power supply system according to claim 4, wherein: It also includes a hot water tank, and the high-temperature heat source and / or the low-temperature heat source are connected to the hot water tank for supplying hot water to the hot water tank.

13. The combined power supply system according to claim 4, wherein: The heat exchange device includes a radiation heat exchanger.

14. A control method for a combined power supply system according to any one of claims 1 to 13, characterized in that: The combined heat supply system includes a high-temperature heat source, a low-temperature heat source, a flow control device, and a fan heat exchanger; the control method includes: Obtaining a user-set temperature and an indoor temperature of an indoor space where each fan heat exchanger in a working state is located, and obtaining a first temperature difference based on the user-set temperature and the indoor temperature; Determining a second temperature difference of the space where the combined heat supply system is located based on the first temperature difference obtained in the indoor space where each of the fan heat exchangers in the working state is located; When the second temperature difference is greater than the first temperature difference threshold, the flow control device is controlled to be in the first state, so that the high-temperature heat source provides heating to the fan heat exchanger.

15. The control method of the combined power supply system according to claim 14, characterized in that: When the second temperature difference is not greater than the first temperature difference threshold, the control method further includes: Determining a first heating fee required for heating based on the high-temperature heat source and a second heating fee required for heating based on the low-temperature heat source when producing the same amount of heat; Whether it is necessary to switch heating from the high-temperature heat source to heating from the low-temperature heat source is determined based on the first heating fee and the second heating fee.

16. The control method of the combined power supply system according to claim 15, characterized in that: The high-temperature heat source is a gas heating device, and the first heating fee is determined by: Obtaining a gas price in a geographical area where the combined power supply system is located and a first energy efficiency of the gas heating device; A first heating fee required by the gas heating device to prepare the same amount of heat is determined based on the gas price and the first energy efficiency.

17. The control method of the combined power supply system according to claim 15, characterized in that: The low-temperature heat source is an air energy device. The combined heat supply system stores a first correspondence between ambient temperature, heating load, and overall energy efficiency for the air energy device. Determining the second heating fee includes: Obtaining the outdoor ambient temperature at the installation location of the cogeneration system, the electricity price in the geographical area, and the required total load; determining a second energy efficiency of the air energy device based on the ambient temperature, the required total load, and the first corresponding relationship; Based on the electricity price and the second energy efficiency, a second heating fee required by the air energy device when preparing the same amount of heat is determined.

18. The control method of the combined power supply system according to claim 15, wherein: When the first heating cost is greater than the second heating cost, the flow control device is controlled to be in the second state, and the low-temperature heat source provides heating to the fan heat exchanger.

19. The control method of the combined energy supply system according to claim 15, wherein: When the first heating cost is not greater than the second heating cost, the high-temperature heat source is maintained to provide heating to the fan heat exchanger.

20. The control method of the combined power supply system according to claim 15, wherein: When the second temperature difference is not greater than the first temperature difference threshold, the control method further includes: controlling the flow control device to be in a second state, and providing heating to the fan heat exchanger by the low-temperature heat source.

21. The control method of the combined power supply system according to claim 20, characterized in that: When the second temperature difference is greater than the first temperature difference threshold, the control method further includes: controlling the flow control device to be in the first state, and again supplying heat to the fan heat exchanger from the high-temperature heat source.

22. The control method of the combined power supply system according to claim 15, wherein: When the second temperature difference is not greater than the first temperature difference threshold, the control method further includes: maintaining the high-temperature heat source to provide heating to the fan heat exchanger.

23. The control method of the combined energy supply system according to any one of claims 14 to 22, characterized in that: Based on the first temperature difference, the fan speed of the fan heat exchanger is controlled, and the controlling of the fan speed of the fan heat exchanger includes any one of the following: reducing, keeping it unchanged first and then reducing.

24. The control method of the combined energy supply system according to any one of claims 14 to 22, characterized in that: The method further comprises: determining a required load based on the first temperature difference; The combined power supply system stores a second correspondence between the required load and the required total load; determining the required total load based on the required load and the second correspondence; The heating load of the high-temperature heat source providing heating to the fan heat exchanger is adjusted based on the change in the required total load.

25. The control method of the combined energy supply system according to any one of claims 14 to 22, characterized in that: The second temperature difference is a maximum value among the first temperature differences or an average value of the first temperature differences.

Images