CN114440352A

CN114440352A - Combined supply system and control method thereof

Info

Publication number: CN114440352A
Application number: CN202011218631.2A
Authority: CN
Inventors: 邱步; 柳飞; 高文伟
Original assignee: AO Smith China Water Heater Co Ltd
Current assignee: AO Smith China Water Heater Co Ltd
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2022-05-06

Abstract

The invention discloses a combined supply system and a control method thereof, wherein the combined supply system comprises: the water outlet temperature of the high-temperature heat source is higher than that 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 communicated with a water inlet of the fan heat exchanger through a first water inlet pipeline, and the first inlet is communicated with a water return port of the fan heat exchanger through a first water return pipeline; the low-temperature heat source is provided with a second inlet and a second outlet, the second inlet is used for being communicated with the first water return pipeline, and the second outlet is used for being communicated with the first water inlet pipeline; and the flow control device is used for controlling the flow between the high-temperature heat source and the low-temperature heat source. The invention can achieve the heating effect of quick heating, further ensure the comfort level and energy saving performance of heating and improve the use experience of users.

Description

Combined supply system and control method thereof

Technical Field

The invention relates to the technical field of heat exchange systems, in particular to a combined supply system and a control method thereof.

Background

In order to meet the demand of the non-central heating areas of China for the rapid increase of winter heating, the currently adopted solution mainly comprises the following steps: the heat pump is used for supplying air to cool in summer and heating in winter.

For the scheme of using the heat pump for two-combined supply, when the temperature is reduced in winter, the heating capacity of the heat pump is reduced, and the heating load requirement is very high, so that the problem of poor heating effect is caused.

On the whole, the current heat pump two-way system is still to be further improved to optimize the comprehensive heating effects such as heating speed, heating comfort, heating energy conservation and the like, thereby improving the use experience of users.

Disclosure of Invention

In order to overcome at least one defect of the prior art, an embodiment of the present invention provides a combined supply system, which can ensure a fast heating effect and improve the user experience.

The specific technical scheme of the embodiment of the invention is as follows:

a combined supply system, the combined supply system comprising: the water outlet temperature of the high-temperature heat source is higher than that 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 communicated with a water inlet of the fan heat exchanger through a first water inlet pipeline, and the first inlet is communicated with a water return port of the fan heat exchanger through a first water return pipeline;

the low-temperature heat source is provided with a second inlet and a second outlet, the second inlet is used for being communicated with the first water return pipeline, and the second outlet is used for being communicated with the first water inlet pipeline;

and the flow control device is used for controlling the flow between the high-temperature heat source and the low-temperature heat source.

Further, the combined supply system has a first mode and/or a second mode, and in the first mode, a circulating 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.

Further, the flow control device is used for cutting off the flow between the high-temperature heat source and the low-temperature heat source.

Further, the second inlet is communicated with the first position of the first water return pipeline through a first connecting pipeline; and the second outlet is communicated with the second position of the first water inlet pipeline through a second connecting pipeline.

Further, the flow control device is a waterway switching valve arranged at the first position or the second position.

Further, the waterway 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 return pipeline, the third port is connected to the first connection pipeline, the first port is located at the upstream of the second port, the waterway switching valve has a first state and a second state, when the waterway switching valve is in the first state, the first port and the second port are communicated, and when the waterway switching valve is in the second state, the first port and the third port are communicated.

Further, the waterway 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 pipeline, the third port is connected to the second connecting pipeline, the first port is located at the upstream of the second port, the waterway switching valve has a first state and a second state, when the waterway switching valve is in the first state, the first port and the second port are communicated, and when the waterway switching valve is in the second state, the second port and the third port are communicated.

Further, the flow control device comprises a first electromagnetic valve and a second electromagnetic valve.

Further, the first solenoid valve is disposed in the second connecting pipeline, and the second solenoid valve is disposed in a first partial pipeline of the first water inlet pipeline, the first partial pipeline being located between the second position and the first outlet, or the second solenoid valve is disposed in a second partial pipeline of the first water return pipeline, the second partial pipeline being located between the first position and the first inlet.

Further, the first solenoid valve is disposed in the first connecting pipeline, and the second solenoid valve is disposed in a second partial pipeline of the first water return pipeline, where the second partial pipeline is located between the first position and the first inlet, or the second solenoid valve is disposed in a first partial pipeline of the first water inlet pipeline, where the first partial pipeline is located between the second position and the first outlet.

Further, the flow control device comprises a third electromagnetic valve and a one-way valve.

Further, the check valve is disposed on the second connection pipeline, the third solenoid valve is disposed in a second portion of the first water return pipeline or in a first portion of the first water inlet pipeline, the first portion of the first water return pipeline is located between the second position and the first outlet, and the second portion of the first water return pipeline is located between the first position and the first inlet.

Further, the check valve is arranged in a first part of pipelines of the first water inlet pipeline, the third electromagnetic valve is arranged in the first connecting pipeline or the second connecting pipeline, and the first part of pipelines is located between the second position and the first outlet.

Further, the high-temperature heat source is: a gas heating device; the low-temperature heat source is as follows: an air energy device.

Furthermore, the combined supply system also comprises a heat exchange device; the outlet of the heat exchange device is connected with the first connecting pipeline through a third connecting pipeline; and the inlet of the heat exchange device is connected with the second connecting pipeline through a fourth connecting pipeline.

Further, the flow control device is arranged at a third position where the third connecting pipeline is connected with the first connecting pipeline, or arranged on a third part of pipelines, or arranged at a fourth position where the first connecting pipeline is connected with the first water return pipeline; the third portion of tubing is located between the third location and the fourth location.

Further, the flow control device includes any one of: a waterway switching valve provided at the third position or the fourth position; and the fourth electromagnetic valve is arranged on the third part pipeline.

Further, a check valve or a fifth electromagnetic valve is arranged between the second connecting pipeline and the first outlet of the high-temperature heat source.

Further, a check valve or a sixth electromagnetic valve is arranged on the second connecting pipeline.

Further, a check valve or a seventh solenoid valve is disposed on the third connecting pipeline or the fourth connecting pipeline.

Furthermore, an energy storage water tank is arranged on the second connecting pipeline.

Furthermore, a bypass pipeline for bypassing the energy storage water tank is further arranged on the second connecting pipeline.

Furthermore, the combined supply system also comprises a hot water tank, and the high-temperature heat source and/or the low-temperature heat source are/is communicated with the hot water tank and used for supplying hot water to the hot water tank.

Further, the heat exchange device comprises a radiation heat exchanger.

A control method of a combined supply system comprises a high-temperature heat source, a low-temperature heat source, a flow control device and a fan heat exchanger; the control method comprises the following steps:

acquiring a user set temperature and an indoor temperature of an indoor space where each fan heat exchanger is located in a working state, and acquiring a first temperature difference value based on the user set temperature and the indoor temperature;

determining a second temperature difference value of the space where the combined supply system is located based on the first temperature difference value obtained in the indoor space where each fan heat exchanger is located in the working state;

and when the second temperature difference value is larger than the first temperature difference threshold value, controlling the flow control device to be in a first state, so that the high-temperature heat source supplies heat to the fan heat exchanger.

Further, when the second temperature difference value is not greater than the first temperature difference threshold value, the control method further includes:

determining a first heating cost required for heating based on the high temperature heat source and a second heating cost required for heating based on the low temperature heat source when the same quantity of heat is produced;

and determining whether it is necessary to switch heating from the high-temperature heat source to heating from the low-temperature heat source based on the first heating cost and the second heating cost.

Further, the determining the first heating cost includes:

acquiring the gas price of a geographical area where the combined supply system is located and the first energy efficiency of the gas heating device;

and determining a first heating cost required by the gas heating device when the same heat is prepared based on the gas price and the first energy efficiency.

Further, the low-temperature heat source is an air energy device, the combined supply system stores a first corresponding relationship between the ambient temperature, the heating load and the overall energy efficiency for the air energy device, and the determining the second heating cost includes:

acquiring the outdoor environment temperature of the installation position of the combined supply system, the electricity price of 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 correspondence;

and determining a second heating cost required by the air energy device for preparing the same heat quantity based on the electricity price and the second energy efficiency.

Further, when the first heating cost is larger than the second heating cost, the flow control device is controlled to be in a second state, and the low-temperature heat source supplies heat to the fan heat exchanger.

Further, when the first heating cost is not more than the second heating cost, the high-temperature heat source is maintained to supply heat to the fan heat exchanger.

Further, when the second temperature difference value is not greater than the first temperature difference threshold value, the control method further includes: and controlling the flow control device to be in a second state, and supplying heat to the fan heat exchanger by the low-temperature heat source.

Further, when the second temperature difference value is greater than the first temperature difference threshold value, the control method further includes: and controlling the flow control device to be in a first state, and supplying heat to the fan heat exchanger again by the high-temperature heat source.

Further, when the second temperature difference value is not greater than the first temperature difference threshold value, the control method further includes: and maintaining the high-temperature heat source to supply heat to the fan heat exchanger.

Further, based on the first temperature difference, controlling a fan speed of the fan heat exchanger, where the controlling the fan speed of the fan heat exchanger includes any one of: and the reduction is firstly unchanged and then reduced.

Further, the method further comprises:

determining a required load based on the first temperature difference;

the combined supply system stores a second corresponding relation between the required load and the required total load;

determining the required total load based on the required load and the second corresponding relation;

and adjusting the heating load of the high-temperature heat source for supplying heat to the fan heat exchanger based on the change of the required total load.

Further, the second temperature difference is a maximum value of the first temperature differences or an average value of the first temperature differences.

The technical scheme of the invention has the following remarkable beneficial effects:

the utility model provides a ally oneself with confession system is provided with the flow control device between its high temperature heat source and the low temperature heat source, through the state that changes this flow control device, can realize that the fluid is not between high temperature heat source and low temperature heat source series flow to can guarantee that the high temperature heat source of ally oneself with confession system or low temperature heat source homoenergetic can be independent, stable, controllably to fan heat exchanger heat supply or refrigeration, thereby be favorable to reaching comprehensive heating effect such as fast heat, comfortable and energy-conserving, improve user's use and experience.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.

Fig. 1 is a schematic structural diagram of an integrated supply system provided in a first embodiment of the present application;

fig. 2 is a schematic structural diagram of an integrated supply system provided in a second embodiment of the present application;

fig. 3 is a schematic structural diagram of an integrated supply system provided in a third embodiment of the present application;

fig. 4 is a schematic structural diagram of an integrated supply system provided in a fourth embodiment of the present application;

fig. 5 is a schematic structural diagram of an integrated supply system provided in a fifth embodiment of the present application;

fig. 6 is a schematic structural diagram of an integrated supply system provided in a sixth embodiment of the present application;

fig. 7 is a schematic structural diagram of an integrated supply system according to a seventh embodiment of the present application;

fig. 8 is a schematic structural diagram of an integrated supply system provided in an eighth embodiment of the present application;

fig. 9 is a schematic structural diagram of a water path switching valve in the combined supply system according to the first embodiment of the present application;

fig. 10 is a schematic structural diagram of an integrated supply system provided in a ninth embodiment of the present application;

fig. 11 is a schematic structural diagram of an integrated supply system according to a tenth embodiment of the present application;

fig. 12 is a flowchart of a control method step of the first combined supply system provided in the embodiment of the present application;

fig. 13 is a flowchart of steps of a control method of a second combined system provided in an embodiment of the present application;

fig. 14 is a flowchart of steps of a control method of a third combined supply system according to an embodiment of the present application;

fig. 15 is a flowchart of a part of steps in a control method of the combined supply system according to the embodiment of the present application.

Reference numerals of the above figures:

1. a high temperature heat source; 11. a first inlet; 12. a first outlet; 13. a first water inlet pipeline; 14. a first water return line; 2. a fan heat exchanger; 3. a low temperature heat source; 31. a second inlet; 32. a second outlet; 33. a first connecting line; 34. a second connecting line; 4. a waterway switching valve; 41. a first port; 42. a second port; 43. a third port; 5. a one-way valve; 61. a first solenoid valve; 62. a second solenoid valve; 63. a third electromagnetic valve; 7. a heat exchange device; 71. a third connecting pipeline; 72. a fourth connecting pipeline; 74. a fourth solenoid valve; 73. a seventh electromagnetic valve; 9. an energy storage water tank; 91. a waterway switching device; 92. a bypass line.

Detailed Description

The technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and various equivalent modifications of the present invention by those skilled in the art after reading the present invention fall within the scope of the appended claims.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 8 in combination, in an embodiment of the present disclosure, a combined 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 and the like which are connected through pipelines.

In the present embodiment, the high temperature heat source 1 may be a device for performing a heating function. Of course, the high temperature heat source 1 may also integrate other functions such as supplying domestic hot water. The functions specifically realized by the high-temperature heat source 1 may be adaptively integrated according to actual requirements, and the present application is not specifically limited herein. Specifically, the high-temperature heat source 1 may be a gas heating device, such as a water heater, a wall-hanging stove, or the like. The high-temperature heat source 1 may be in other forms, for example, any one of a solar heating device, an electric heating device, and an air heating device. In the present description, the high-temperature heat source 1 is mainly described by taking a gas heating device, in particular a wall-hanging stove as an example, and other forms can be correspondingly and equivalently replaced by referring to the form, and the application is not further elaborated herein.

In the present embodiment, the low temperature heat source 3 may be a device for realizing a heating function. Of course, the low-temperature heat source 3 may also integrate other functions such as refrigeration, domestic hot water supply, and the like. The functions of the low-temperature heat source 3 can be adaptively integrated according to actual requirements, and the application is not specifically limited herein. Specifically, the low-temperature heat source 3 may be an air energy device, such as a heat pump, an air conditioner, or the like. Further, it may be in other forms, for example, any one of a solar heating device, a gas heating device, an electric heating device, and the like. In the present description, the low-temperature heat source 3 is mainly described by taking an air energy device as an example, and other forms can be correspondingly and equivalently replaced by reference to the form, and the application is not further elaborated herein.

In the present embodiment, the fan heat exchanger 2 is used to cool or heat indoor air or outdoor air mixture and send the air into a room, so as to lower or raise the indoor air temperature to meet the cooling or heating demand. In particular, the form of the fan heat exchanger 2 is not limited in this application, for example, the fan heat exchanger 2 may be in the form of a fan coil.

Taking a fan coil as an example, the fan coil mainly comprises a fan, a radiator, a heat exchange coil and the like. When the fan coil works, air is heated when passing through the surface of the heat exchange coil mainly under the forced action of the fan, so that the heat convection effect between the radiator and the air is strengthened, and the air in a room can be heated quickly.

When the fan heat exchanger 2 is used as the tail end of a heat source, the indoor space can achieve a quick heating effect. Particularly, when the fan heat exchanger 2 is matched with a high-temperature heat source 1 (such as a wall-mounted furnace), the quick-heating effect is more favorably realized. Relatively speaking, the outlet water temperature of the high-temperature heat source 1 is higher than that of the low-temperature heat source 3, and when the high-temperature heat source 1 supplies heat to the fan heat exchanger 2, the high-temperature heat source and the fan heat exchanger cooperate with each other, so that the room temperature can be raised in a shorter time, and the quick-heating effect is achieved.

Specifically, when the high-temperature heat source 1 is in the form of a gas heating device, the outlet water temperature of the high-temperature heat source 1 is not limited by the external environment temperature, and can be set correspondingly according to the user requirement, and when the outlet water temperature set by the user is higher, the quick heating effect during heating can be reliably ensured. When the low-temperature heat source 3 is in the form of an air energy device, and the air energy device is matched with the fan heat exchanger 2, the energy-saving property of the air energy device is utilized, and the energy-saving property during heating can be also considered.

In this specification, it is to be noted that: the outlet water temperatures of the high-temperature heat source 1 and the low-temperature heat source 3 can be set correspondingly according to the requirements of users, different users have different use requirements, the situation that the outlet water temperature of the low-temperature heat source 3 is set to be higher than that of the high-temperature heat source 1 by the users in some application scenes is not eliminated, at the moment, the two heat sources can be converted into each other, namely the original high-temperature heat source 1 is changed into the low-temperature heat source 3, and the original low-temperature heat source 3 is changed into the high-temperature heat source 1.

In the present 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 communicated with the water inlet of the fan heat exchanger 2 through a first water inlet pipe, and the water return port of the fan heat exchanger 2 can be communicated with the first inlet 11 through a first water return pipeline 14, so that the fan heat exchanger 2 is matched with a user to supply heat.

In the present embodiment, the low-temperature heat source 3 is provided with a second inlet 31 and a second outlet 32. The second inlet 31 is adapted to communicate with the first water return line 14, and the second outlet 32 is adapted to communicate with the first water inlet line 13. In particular, the second inlet 31 may communicate with the first position of the first water return line 14 through a first connecting line 33. The second outlet 32 may be in communication with a second location of the first water inlet line 13 via a second connecting line 34. The first connecting pipeline 33, the second connecting pipeline 34, the shared part of the first water inlet pipeline 13 and the first water return pipeline 14 are used for establishing the communication relation between the low-temperature heat source 3 and the fan heat exchanger 2, the pipeline connection is flexible and simple, the pipeline structure is compact, the cost is low, and the occupied user space is small.

In addition, the second inlet 31 may also be connected to the first water return pipe 14 through a three-way connection structure, and the second outlet 32 may also be connected to the first water inlet pipe 13 through a three-way connection structure. Alternatively, the second inlet 31 and the first return line 14, and the second outlet 32 and the first inlet line 13 can be connected in other ways.

In the present embodiment, the flow rate control device is used to control the flow rate 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 communication relationship between the high-temperature heat source 1 and the low-temperature heat source 3 and the fan heat exchanger 2 can be switched, and the fluids between the high-temperature heat source 1 and the low-temperature heat source 3 are ensured not to be mutually connected (especially, the fluids are not mutually connected in the communication pipelines of the shared first water inlet pipeline 13 and the shared first water return pipeline 14), so that the stability and the control accuracy of supplying the fluids to the fan heat exchanger 2 by a single heat source are ensured.

Here, it should be noted that: the flow control device may be used to completely shut off the flow between the high temperature heat source 1 and the low temperature heat source 3 when controlled. In addition, 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, that is, there is a series flow between the high temperature heat source 1 and the low temperature heat source 3 that does not affect the operating parameters of the high temperature heat source 1 or the low temperature heat source 3. In the embodiments of the present specification, an embodiment in which the flow rate control device completely shuts off the flow rate will be mainly exemplified.

In the present embodiment, the combined 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 furnace) and a fan heat exchanger 2; in the second mode, a circulation flow path is formed between the low-temperature heat source 3 (such as an air energy device) and the fan heat exchanger 2.

Specifically, the combined supply system may have at least one mode, and the number and the type of the modes may be configured according to the requirements of specific functions 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, the quick-heating function can be realized. The circulation flow path formed in the first mode may 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 pipeline 13 for heat exchange, and then flows back to the high-temperature heat source 1 through the first water return pipeline 14 and the first inlet 11. In the second mode, the low-temperature heat source 3 (e.g., an air energy device) supplies heat to the blower heat exchanger 2, which may implement an energy-saving heating function or implement a cooling function, etc. The circulation flow rate formed in the second mode may 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 pipeline 34 and the shared part first water inlet pipeline 13 for heat exchange, and then flows back to the low-temperature heat source 3 through the shared part first water return pipeline 14, the first connecting pipeline 33 and the second inlet 31.

In the present embodiment, by switching the state of the flow rate control device, it is possible to adapt to different operation modes of the combined 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 in the form of a valve with more communication joints or a combination of a plurality of valves, and the specific form of the flow control device can be selected according to the functional requirements of pipeline connection and a combined supply system and the like.

The following description will be made in conjunction with the accompanying drawings in various embodiments in conjunction with different forms and different setting positions of the flow control device.

As shown in fig. 1 or 2, in the first or second embodiment, the flow rate control means may be a waterway switching valve 4 provided at a first position or a second position.

In a first embodiment, referring to fig. 1 and 9, the waterway 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 return pipeline 14, the third port 43 is connected to the first connecting pipeline 33, and the first port 41 is located upstream of the second port 42.

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 communicated, and at this time, the cogeneration system may 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 communicated, and at this time, the combined supply system may be in the second mode.

In the present embodiment, the operation mode of the cogeneration system can be changed by simply switching the state of the water path switching valve 4 without frequently starting and stopping the high temperature heat source 1 and the low temperature heat source 3, and the flow direction of the fluid flowing out of the first return water pipe 14 can be smoothly changed by merely changing the communication relationship of the ports of the water path switching valve 4 when the water path switching valve 4 is switched when the water path switching valve 4 is located at the first position, thereby realizing the switching of the different modes of the cogeneration system.

In a second embodiment, referring to fig. 2 and 9, the waterway 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 pipeline 13, the third port 43 is connected to the second connection pipeline 34, and the first port 41 is located upstream of the second port 42.

The waterway switching valve 4 has a first state and a second state, and when the waterway switching valve 4 is in the first state, the first port 41 and the second port 42 are communicated, and at this time, the cogeneration system can be in the first mode. When the waterway switching valve 4 is in the second state, the second port 42 and the third port 43 are communicated, and at this time, the cogeneration system may be in the second mode.

In the present embodiment, the operation mode of the cogeneration system can be changed by simply switching the state of the water path switching valve 4 without frequently starting and stopping the high temperature heat source 1 and the low temperature heat source 3, and when the water path switching valve 4 is located at the second position, the communication relationship between different heat sources and a part of the first water inlet pipes 13 can be selected by merely changing the communication relationship between the ports of the water path switching valve 4 when the water path switching valve 4 is switched, thereby realizing the mode switching. Wherein, the part of the first water inlet pipeline 13 is a water inlet pipeline between the second position and the fan heat exchanger 2.

As shown in fig. 3 or 4, in the third or fourth embodiment, the flow rate control means includes a first solenoid valve 61 and a second solenoid valve 62.

Referring to fig. 3, the first solenoid valve 61 is disposed in the second connecting pipeline 34, and the second solenoid valve 62 is disposed in a first portion of the first water inlet pipeline 13, which is located between the second position and the first outlet 12.

In this embodiment, the combination of the first solenoid valve 61 and the second solenoid valve 62 may be equivalent to the waterway 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 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 supply system is in the second mode.

Referring to fig. 4, the first solenoid valve 61 is disposed in the first connecting line 33, and the second solenoid valve 62 is disposed in a second portion of the first return line 14 between the first position and the first inlet 11.

In this embodiment, the combination of the first solenoid valve 61 and the second solenoid valve 62 may be equivalent to the waterway 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 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 supply system is in the second mode.

As shown in fig. 5 to 8, in the fifth to eighth embodiments, the flow rate control means includes the third solenoid valve 63, the check valve 5.

Referring to fig. 5, in the fifth embodiment, the check valve 5 is disposed on the second connecting line 34, and the third solenoid valve 63 is disposed in the first portion of the first water inlet line 13 between the second position and the first outlet 12.

In the present embodiment, the check valve 5 may be disposed on the second connection line 34 such that fluid cannot flow into the low temperature heat source 3 through the second connection line 34 and the second outlet 32. The third electromagnetic valve 63 is disposed in the first partial pipe of the first water inlet pipe 13, and when the third electromagnetic valve 63 is in an open state, the low-temperature heat source 3 may not be started first, and the high-temperature heat source 1 supplies heat to the blower heat exchanger 2. When the high-temperature heat source 1 supplies heat to the fan heat exchanger 2, fluid flowing out of the high-temperature heat source 1 cannot flow into the low-temperature heat source 3 due to the one-way conduction function of the one-way valve 5, and at the moment, the combined supply system is in the first mode. When the third electromagnetic valve 63 is in a 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. Under the condition that the low-temperature heat source 3 supplies heat to the fan heat exchanger 2, fluid flowing out of the low-temperature heat source 3 exchanges heat with the fan heat exchanger 2, and does not flow into the high-temperature heat source 1 in series due to the fact that the third electromagnetic valve 63 is in a closed state in the process of returning the low-temperature heat source 3. At this time, the combined supply system is in the second mode.

Referring to fig. 6, in the sixth embodiment, the check valve 5 is disposed on the second connection line 34, and the third solenoid valve 63 is disposed in the second partial line of the first return line 14. The second part of the line is located between the first location and the first inlet 11.

In the present embodiment, the check valve 5 may be disposed on the second connection line 34 such that fluid cannot flow into the low temperature heat source 3 through the second connection line 34 and the second outlet 32. The third solenoid valve 63 is disposed in the second partial pipe of the first water return pipe 14, and when the third solenoid valve 63 is in an open state, the low-temperature heat source 3 may not be started first, and the high-temperature heat source 1 may supply heat to the blower 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 cannot flow into the low-temperature heat source 3 in series due to the one-way conduction function of the one-way valve 5, and at the moment, the combined supply system is in the first mode. When the third electromagnetic valve 63 is in a 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. Under the condition that 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 exchanges heat with the fan heat exchanger 2, and does not flow into the high-temperature heat source 1 in series because the third electromagnetic valve 63 is in a closed state in the process of returning the low-temperature heat source 3. At this time, the combined supply system is in the second mode.

Referring to fig. 7, in the seventh embodiment, the check valve 5 is disposed in the first portion of the first water inlet pipeline 13, and the first portion of the first water inlet pipeline is located between the second position and the first outlet 12. A third solenoid valve 63 is provided in the first connecting line 33.

In this embodiment, the check valve 5 may be disposed in a first portion of the first water inlet line 13 between the second position and the first outlet 12. By providing the check valve 5, fluid cannot flow into the high temperature heat source 1 through the first water inlet line 13. The third solenoid valve 63 may be disposed in the first connecting pipe 33, when the third solenoid valve 63 is in a closed state, the high temperature heat source 1 supplies heat to the blower heat exchanger 2, and the fluid flowing out of the high temperature heat source 1 does not flow into the low temperature heat source 3 due to the closed state of the third solenoid valve 63, at this time, the combined supply system is in the first mode. When the third electromagnetic valve 63 is in an open state, the high-temperature heat source 1 can be in a 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 supply system enters a second mode.

Referring to fig. 8, in the eighth embodiment, the check valve 5 is disposed in the first portion of the first water inlet pipeline 13, and the first portion of the first water inlet pipeline is located between the second position and the first outlet 12. A third solenoid valve 63 is provided in the second connecting line 34.

In this embodiment, the check valve 5 may be disposed in a first portion of the first water inlet line 13 between the second position and the first outlet 12. By providing the check valve 5, fluid cannot flow into the high temperature heat source 1 through the first inlet pipe. The third electromagnetic valve 63 may be disposed in the second connecting line 34, when the third electromagnetic valve 63 is in a closed state, the high-temperature heat source 1 supplies heat to the blower heat exchanger 2, and the fluid flowing out of the high-temperature heat source 1 cannot be mixed into the low-temperature heat source 3 due to the closed state of the third electromagnetic valve 63, at this time, the combined supply system is in the first mode. When the third electromagnetic valve 63 is in an open state, the high-temperature heat source 1 can be in a 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 supply system enters a second mode.

Based on the examples of the embodiments described above in this specification, specific combinations and positions of the flow control devices may be selected and arranged on the basis of the embodiments described above. For example, in some other embodiments, the ninth embodiment may be formed by changing the position of the second solenoid valve 62 based on the third embodiment described above.

In this embodiment, the first solenoid valve 61 may be provided in the second connecting line 34, while the second solenoid valve 62 is provided in a second partial line of the first return line 14, which is located between the first position and the first inlet 11.

When the first electromagnetic valve 61 is in a closed state and the second electromagnetic valve 62 is in an open state, the high-temperature heat source 1 is used for supplying heat to the fan heat exchanger 2, and at the moment, the combined supply system is in a first mode; when the first electromagnetic valve 61 is in an open state and the second electromagnetic valve 62 is in a closed state, the low-temperature heat source 3 is used for supplying heat to the fan heat exchanger 2, and at the moment, the combined supply system is in a second mode.

Further, based on the fourth embodiment described above, the tenth embodiment can be formed by changing the position of the second solenoid valve 62.

In this embodiment, the first solenoid valve 61 is disposed in the first connecting line 33, and the second solenoid valve 62 is disposed in the first partial line of the first water inlet line 13 between the second position to the first outlet 12.

In the combined supply system provided in the specification, the flow control device is arranged between the high-temperature heat source 1 and the low-temperature heat source 3, and by changing the state of the flow control device, the fluid can not be serially flowed between the high-temperature heat source 1 and the low-temperature heat source 3, so that the high-temperature heat source 1 or the low-temperature heat source 3 of the combined supply system can be ensured to independently, stably and controllably supply heat or refrigerate to the fan heat exchanger 2, and therefore comprehensive heating effects of quick heating, comfort, energy conservation and the like can be achieved, and the use experience of a user is improved.

Referring to fig. 10 and 11 in combination, in some embodiments, the combined supply system may further include: and a heat exchange device 7. An outlet of the heat exchanging device 7 for being connected with the first connecting line 33 through a third connecting line 71; an inlet of the heat exchanging device 7 is connected with the second connecting line 34 through a fourth connecting line 72.

In the present embodiment, the heat exchange device 7 is not limited in its specific form according to the heat exchange principle. Specifically, the heat exchange device 7 may include any one or a combination of the following: fan heat exchanger, radiation heat exchanger. Wherein, when the heat exchange device 7 is a radiation heat exchanger, the radiation heat exchanger can be in the form of a radiating fin, or in the form of a floor heating, or in the form of the integration of the radiating fin and the floor heating. In the embodiment of the present specification, the heat exchanging device 7 is mainly described in the form of a floor heating system by way of example, and other forms can be adaptively analogized and referred to, and the detailed description is not provided herein.

In the present embodiment, the heat exchanger 7 can be adapted to the high-temperature heat source 1 or the low-temperature heat source 3 by switching the on/off relationship of the pipelines, so as to independently supply heat or cool air to the user. In addition, through setting up this heat transfer device 7, high temperature heat source 1 and low temperature heat source 3 can also select intercommunication fan heat exchanger 2, heat transfer device 7 through the mode of free pairing combination, and both independent heat supplies heat and reach the technological effect of economic benefits and social benefits fast heat.

In order to achieve a better quick heating effect when the high-temperature heat source 1 and the low-temperature heat source 3 independently supply heat, the heat exchange efficiency of the fan heat exchanger 2 can be higher than that of the heat exchange device 7. When the combined supply system is in a first mode, the high-temperature heat source 1 supplies heat to the fan heat exchanger 2 with higher heat exchange efficiency, and the low-temperature heat source 3 supplies heat to the heat exchange device 7 with lower heat exchange efficiency, so that the temperature of a room can be rapidly increased, and an ideal quick heating effect is achieved.

Experiments prove that when the combined supply system performs heating in the same space through the combined heating mode, for example, in the combined heating mode, the wall-mounted furnace supplies heat to the fan coil and the heat pump supplies heat to the floor heating, the temperature of the space is increased from 5 ℃ to 22 ℃ for only 8.5 minutes for the same space, and when the heating is performed by adopting the mode in the prior art, the same temperature rise is required for the same space for at least 30 minutes.

In this specification, the above-mentioned manner in which the high-temperature heat source 1 supplies heat to the fan heat exchanger 2 having high heat exchange efficiency and the low-temperature heat source 3 supplies heat to the heat exchanger 7 having low heat exchange efficiency is mainly used as an example, and for other scenes, for example, when the high-temperature heat source 1 supplies heat to the fan heat exchanger 2 having low heat exchange efficiency and the low-temperature heat source 3 supplies heat to the heat exchanger 7 having high heat exchange efficiency, the purpose of quick heating is also achieved. The difference between the two may be a slight difference in the time of the temperature rise.

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

Specifically, the specific form of the flow control device may include any one of: a waterway switching valve 4 provided at a third position or a fourth position, as shown in fig. 10; and a fourth solenoid valve 74 disposed on the third section line, as shown in fig. 11.

In this embodiment, the flow control device may be provided in different forms depending on the position thereof. Wherein the flow control means may be in the form of a waterway switching valve 4 when the flow control means is provided at a node position where a plurality of pipes are connected, and may be in the form of an electromagnetic valve when the flow control means is provided in a single pipe.

In an implementation scene, when the flow control device plugs the third part of the pipeline, taking the high-temperature heat source 1 and the low-temperature heat source 3 for heating at the same time as an example, because the flow control device plugs the third part of the pipeline, 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 exchange device 7, namely, two different heat sources independently supply heat to respective heat exchangers respectively, and the fluid between the pipelines does not interfere with each other, so that the double-effect quick heating effect can be achieved, the flow can be adaptively controlled according to the difference of the heating capacity of the heat exchangers, the characteristic of each heat source can be more reasonably utilized for accurate regulation and control, the comprehensive heating effects of quick heating, comfort, energy conservation and the like can be achieved, and the use experience of users can be improved.

In one embodiment, a check 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.

When a check valve is provided between the second connecting line 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 into the line through the check valve; on the contrary, when the fluid in the pipeline where the check valve is located flows in the reverse direction, the fluid can be stopped by the check valve, and cannot flow to the high-temperature heat source 1 through the check valve. Specifically, by utilizing the one-way stopping characteristic of the one-way valve, the fluid can be ensured not to be mixed into the high-temperature heat source 1 when the low-temperature heat source 3 supplies heat. Or, after the check valve is replaced by a fifth electromagnetic valve, when the fifth electromagnetic valve is in a closed state, the low-temperature heat source 3 is matched with the fan heat exchanger 2 or the heat exchange device 7 to realize refrigeration and heating. In the process of refrigeration or heating, fluid cannot be connected into the high-temperature heat source 1 in series due to the action of the one-way valve or the fifth electromagnetic valve.

In one embodiment, a non-return valve or a sixth solenoid valve is provided on the second connecting line 34.

When a check valve is provided in the second connecting line 34, the fluid flowing out of the second outlet 32 of the low-temperature heat source 3 can flow into the line through the check valve, and conversely, the fluid in the second connecting line 34 can be stopped by the check valve when flowing in the opposite direction, and cannot flow into the low-temperature heat source 3 through the check valve. Specifically, by utilizing the one-way stopping characteristic of the one-way valve, the fluid can be ensured not to be mixed into the low-temperature heat source 3 when the high-temperature heat source 1 supplies heat. Or after the check valve is replaced by a sixth electromagnetic valve, the sixth electromagnetic valve is in a closed state, and the high-temperature heat source 1 is matched with the fan heat exchanger 2 or the heat exchange device 7 to realize refrigeration and heating. In the process of refrigeration or heating, fluid cannot be mixed into the low-temperature heat source 3 due to the action of the one-way valve or the sixth electromagnetic valve.

In one embodiment, a non-return valve or a seventh solenoid valve 73 is provided on the third connecting line 71 or the fourth connecting line 72.

In the present embodiment, a check valve or a seventh solenoid valve 73 is provided in the third connecting line 71 or the fourth connecting line 72 in order to prevent a fluid from flowing into the heat exchanging device 7 when the low-temperature heat source 3 is used in conjunction with the fan heat exchanger 2 to perform cooling or heating.

When the third connecting pipeline 71 or the fourth connecting pipeline 72 is provided with a check valve, the check valve allows the fluid to flow into the heat exchanging device 7 from the fourth connecting pipeline 72 and then flow out of the third connecting pipeline 71, without restricting the reverse flow of the reverse fluid, so that when the low-temperature heat source 3 and the fan heat exchanger 2 work in a matching manner, the fluid does not flow from the third connecting pipeline 71 to the heat exchanging device 7 after passing through the connecting position of the third connecting pipeline 71 and the first connecting pipeline 33. Alternatively, the check valve may be in the form of a seventh solenoid valve 73. When the seventh solenoid valve 73 is in a closed state, it can prevent the fluid from flowing into the heat exchanging device 7 through the third connecting pipe 71, and thus the fluid can be prevented from flowing into the heat exchanging device 7.

In some embodiments, the water inlet and outlet positions of the heat exchange device 7 can be provided with a water collecting and collecting device. Generally, the water collector and the water collector have a function of opening and closing the fluid. At this time, the seventh solenoid valve 73 may be in the form of a water trap. In addition, in order to ensure the reliability of fluid control, a one-way valve or an electromagnetic valve can be arranged in a superposed mode in a scene of arranging the water dividing and collecting device.

In one embodiment, a storage tank 9 can also be provided on the second connecting line 34.

In the present embodiment, by providing the energy storage water tank 9 in the second water inlet pipe, the energy storage water tank 9 can be used as an energy storage and supplement device for the low-temperature heat source 3, when the energy in the cogeneration system is surplus, the surplus energy can be stored in the energy storage water tank 9, and when the energy required in the cogeneration 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.

In particular, the energy-storing water tank 9 may be arranged in the inlet pipe between the second outlet 32 to the connection point of the second connection line 34 and the second inlet line. When the energy storage water tank 9 is arranged at the position, the energy storage water tank can store or supplement energy when the low-temperature heat source 3 is matched with the fan heat exchanger 2 to realize heating or cooling, and can also store or supplement energy when the low-temperature heat source 3 and the heat exchange device 7 realize heating or cooling.

Furthermore, a bypass line 92 for bypassing the storage tank 9 can also be provided on the second connecting line 34.

Specifically, a water path switching device 91 may be disposed on the second water inlet pipe between the second inlet 31 and the energy storage water tank 9. The first end and the second end of the waterway switching device 91 are respectively connected with the second water inlet pipe, and the third end is connected to the second connecting pipeline 34 through the bypass pipeline 92.

When the water path switching device 91 is arranged on the second water inlet pipe at the position and the third section of the water path switching device 91 is connected to the second connecting pipeline 34 through the bypass pipeline 92, whether the energy storage water tank 9 is connected or not can be flexibly controlled according to the actual use working condition. Specifically, when the third end is communicated with the bypass line 92 and the second end is not communicated with the energy storage water 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 line 92, and no fluid passes through the energy storage water tank 9. When the third end is not communicated with the bypass pipeline 92, and the first end and the second end are communicated with the energy storage water tank 9, the fluid flowing out of the low-temperature heat source 3 firstly passes through the energy storage water tank 9 to store energy and then is supplied to the fan heat exchanger 2 or the heat exchange device 7.

In a practical application scenario, for example, when the combined supply system is just started, a general user expects that the indoor ambient temperature can quickly reach a set temperature, and at this time, the bypass pipeline 92 can be firstly utilized to work to short-circuit the energy storage water tank 9; when the indoor ambient temperature reaches the set temperature and the whole combined supply system has surplus energy, the bypass pipeline 92 can be closed at the moment, and the energy storage water tank 9 is communicated for storing energy. Subsequently, the energy released in the energy storage water tank 9 is supplied to the fan heat exchanger 2 or the heat exchange device 7, so that the purpose of energy conservation can be achieved, frequent starting and stopping of the machine can be avoided, and the service life of the whole machine is prolonged.

In one embodiment, the combined supply system further comprises a hot water tank, with which the high temperature heat source 1 and/or the low temperature heat source 3 are in communication for supplying hot water to the hot water tank.

In the present 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 port for supplying hot water to the outside, and the hot water port may supply hot water to the user. Specifically, the hot water port may be communicated with a hot water tank, and hot water heated by at least one of the high temperature heat source 1 and the low temperature heat source 3 may be stored in the hot water tank. When the user needs to use hot water, hot water can be supplied to the user by the hot water tank.

Referring to fig. 12, based on the combined supply system provided in the foregoing embodiment, the present application also provides a control method of the combined supply system. Wherein, the combined supply system comprises 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 comprises the following steps:

step S10: acquiring a user set temperature and an indoor temperature of an indoor space where each fan heat exchanger 2 in a working state is located, and acquiring a first temperature difference value based on the user set temperature and the indoor temperature;

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

step S13: when the second temperature difference value is larger than the first temperature difference threshold value, the flow control device is controlled to be in a first state, and the high-temperature heat source 1 supplies heat to the fan heat exchanger 2.

In the present embodiment, the combined supply system may be provided with hardware or software for realizing intelligent control, in addition to core components such as the high-temperature heat source 1, the low-temperature heat source 3, the flow control device, and the fan heat exchanger 2. The hardware or software may be integrated into a controller, for example, may be presented in the form of a circuit board, or may be integrated into a component, and the application is not limited in this embodiment. In the following embodiments, the description will be mainly given in the form of a controller.

Under a specific application scene, when the user has the demand of heating, can start fan heat exchanger 2 in the room that needs to heat through remote control or APP setting or trigger mode such as button, receive the trigger signal who starts fan heat exchanger 2 when the controller after, acquire the temperature signal of this fan heat exchanger 2 place indoor space's temperature sensor, realize acquireing the indoor temperature of every fan heat exchanger 2 place indoor space that is in operating condition promptly. Meanwhile, the controller can also acquire the user set temperature of the fan heat exchanger 2 in the indoor space. After the indoor temperature and the user-set temperature are obtained, the difference between the indoor temperature and the user-set temperature can be obtained, so that a first temperature difference value is obtained.

After obtaining the first temperature difference value of each indoor space to be heated, a second temperature difference value of the space where the cogeneration system is located can be determined based on the first temperature difference value. The second temperature difference may be a maximum value of the first temperature differences, or the second temperature difference may be an average value of the first temperature differences, or the second temperature difference may be a second temperature difference obtained by deriving after substituting the first temperature difference into a preset calculation model. The preset calculation model may be a self-learning model, or may also be other models, and the present application is not limited in particular.

The controller of the combined supply system can store a first temperature threshold, after the second temperature difference is determined, the second temperature difference can be compared with the first temperature threshold, if the second temperature difference is larger than the first temperature threshold, the heating requirement of the indoor space at the moment is very large, the flow control device can be controlled to be in the first state at the moment, and the high-temperature heat source 1 supplies heat to the fan heat exchanger 2. The first temperature threshold may be measured according to a plurality of sets of experiments before the product leaves the factory, or may be set in combination with the local environment and the user's requirements, and the numerical value of the first temperature threshold is not specifically limited in this application.

In this embodiment, in order to enable the purpose of intelligent energy saving when the combined supply system operates, when the second temperature difference is not greater than the first temperature difference threshold, the control method may further include the following steps:

step S14: determining a first heating cost required for heating based on the high temperature heat source 1 and a second heating cost required for heating based on the low temperature heat source 3 when the same heat quantity is prepared;

step S16: whether or not heating from the high-temperature heat source 1 needs to be switched to heating from the low-temperature heat source 3 is determined based on the first heating cost and the second heating cost.

In one embodiment, when the high temperature heat source 1 is a gas heating apparatus, determining the first heating cost includes:

When the low-temperature heat source 3 is an air energy device, the combined supply system stores a first corresponding relation between the ambient temperature, the heating load and the complete machine energy efficiency for the air energy device, and determining the second heating cost comprises the following steps:

and determining a second heating cost required by the air energy device when the same heat is prepared based on the electricity price and the second energy efficiency.

After calculating the first heating cost and the second heating cost, the control method comprises the following steps: step S162: when the first heating expense is larger than the second heating expense, the flow control device is controlled to be in the second state, and the low-temperature heat source 3 supplies heat to the fan heat exchanger 2, so that the effects of energy-saving heating and low-cost heating are achieved.

Step S161: when the first heating cost is not more than the second heating cost, the high-temperature heat source 1 can be maintained to supply heat to the fan heat exchanger 2. At this time, along with the increase of the temperature of the indoor space, the rotating speed of the fan heat exchanger 2 can be gradually reduced, so that the comprehensive heating effect of energy-saving heating and low-cost heating is achieved.

Referring to fig. 13, in some embodiments, the control method further includes step S15: and when the second temperature difference value is not greater than the first temperature difference threshold value, controlling the flow control device to be in a second state, and supplying heat to the fan heat exchanger 2 by the low-temperature heat source 3.

In the present embodiment, when the second temperature difference is not greater than the first temperature difference threshold, the controller does not perform the cost determination in the above-described embodiment, and directly controls the flow rate control device to be in the second state, and the low-temperature heat source 3 supplies heat to the blower heat exchanger 2.

Specifically, after the combined supply system operates for a period of time in the second mode in which the low-temperature heat source 3 supplies heat to the fan heat exchanger 2, when the second temperature difference is identified to be greater than the first temperature difference threshold value through temperature detection and judgment, the control method may further include: and controlling the flow control device to be in a first state, and supplying heat to the fan heat exchanger 2 again by the high-temperature heat source 1, so that the heating requirement of a user is ensured.

Referring to fig. 14, in some embodiments, the control method may further include step S17: and when the second temperature difference value is not greater than the first temperature difference threshold value, the high-temperature heat source 1 is maintained to supply heat to the fan heat exchanger 2. That is to say, after the indoor space temperature rises, the set temperature condition may be reached, and the high-temperature heat source 1 needs to be switched to the low-temperature heat source 3 for heat supply, and for such a scenario, the combined supply system provided by the application can be flexibly selected according to the requirements of users. 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. Aiming at the scene, the rotating speed of the fan heat exchanger 2 can be controlled based on the first temperature difference value, so that the purposes of energy-saving heating and noise-reducing comfortable heating are achieved.

When the fan rotating speed of the fan heat exchanger 2 is specifically regulated and controlled, when the temperature difference value of the indoor space where the fan heat exchanger 2 is located is small, for example, when a certain set value is reached, the fan rotating speed can be adaptively reduced along with the gradual reduction of the first temperature difference value on the basis of the current fan rotating speed. In addition, the current fan rotating speed can be maintained to work for a period of time, and when the air temperature of the indoor space where the fan heat exchanger 2 is located is ensured to be uniform, the fan rotating speed can be reduced adaptively according to the gradual reduction of the first temperature difference.

In other scenarios, when the fan rotation speed of the fan heat exchanger 2 needs to be controlled based on the first temperature difference, the controlling of the fan rotation speed of the fan heat exchanger 2 may also include any one of the following: and the reduction is firstly unchanged and then reduced. Specifically, the adjustment process may refer to the detailed description of the above embodiments, and details are not repeated herein.

Referring to fig. 15, in an embodiment, in order to ensure that the cogeneration system can ensure the comfort of heating of the user when the high-temperature heat source 1 supplies heat, and simultaneously realize energy-saving heating, the method may further include the following steps:

step S21: determining a required load based on the first temperature difference;

step S22: the joint supply system stores a second corresponding relation between the required load and the required total load;

step S23: determining a required total load based on the required load and the second corresponding relation;

step S24: and adjusting the heating load of the high-temperature heat source 1 for heating the fan heat exchanger 2 based on the change of the required total load.

In the present embodiment, for the purpose of the above-described comfortable and energy-saving heating, load adjustment may be performed when the high-temperature heat source 1 supplies heat. Specifically, the required load may be determined by first giving the temperature difference value to each indoor space, and after the required load is determined, the required load may be substituted into the second correspondence relationship between the required load and the required total load. The second corresponding relationship may be a mapping relationship obtained by summing each required load to obtain a required total load, or may be another mapping relationship established between the required load and the required total load, and specifically, the present application is not limited thereto.

After determining the total required load, the controller may adaptively adjust a heating load of the high temperature heat source 1 to heat the blower heat exchanger 2 based on a change in the total required load. As a whole, the heating load decreases as the total load required decreases, and increases as the total load increases.

It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from the other embodiments.

The above embodiments are only a few embodiments of the present invention, and the embodiments of the present invention are described above, but the present invention is only used for the understanding of the present invention, and is not limited to the embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A co-generation system, comprising: the water outlet temperature of the high-temperature heat source is higher than that of the low-temperature heat source;

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

3. The combined supply system of claim 2, wherein the flow control device is configured to shut off flow between the high temperature heat source and the low temperature heat source.

4. The combined supply system according to any one of claims 1 to 3, wherein the second inlet communicates with the first location of the first water return line via a first connecting line; and the second outlet is communicated with the second position of the first water inlet pipeline through a second connecting pipeline.

5. The combined supply system of claim 4, wherein the flow control device is a waterway switching valve disposed at the first position or the second position.

6. The combined supply system according to claim 5, wherein the waterway switching valve includes a first port, a second port, and a third port, the first port and the second port are connected to the first return line, respectively, the third port is connected to the first connection line, the first port is located upstream of the second port, the waterway switching valve has a first state in which the first port and the second port are communicated, and a second state in which the waterway switching valve is in the second state in which the first port and the third port are communicated.

7. The combined supply system of claim 5, wherein the waterway switching valve includes a first port, a second port, and a third port, the first port and the second port are connected to the first inlet line, respectively, the third port is connected to the second connecting line, the first port is located upstream of the second port, the waterway switching valve has a first state and a second state, the first port and the second port are communicated when the waterway switching valve is in the first state, and the second port and the third port are communicated when the waterway switching valve is in the second state.

8. The combined supply system of claim 4, wherein the flow control device comprises a first solenoid valve, a second solenoid valve.

9. The combined supply system according to claim 8, wherein the first solenoid valve is provided in the second connecting line, the second solenoid valve is provided in a first partial line of the first water inlet line between the second position and the first outlet, or the second solenoid valve is provided in a second partial line of the first water return line between the first position and the first inlet.

10. The combined supply system according to claim 8, wherein the first solenoid valve is provided in the first connecting line, the second solenoid valve is provided in a second partial line of the first return line between the first position and the first inlet, or the second solenoid valve is provided in a first partial line of the first water inlet line between the second position and the first outlet.

11. The combined supply system of claim 4, wherein the flow control device comprises a third solenoid valve, a one-way valve.

12. The combined supply system of claim 11, wherein the check valve is disposed on the second connecting line, the third solenoid valve is disposed in a second portion of the first return line or in a first portion of the first inlet line, the first portion of the first return line being between the second position and the first outlet, and the second portion of the first return line being between the first position and the first inlet.

13. The combined supply system of claim 11, wherein the one-way valve is disposed in a first portion of the first water inlet line, the third solenoid valve is disposed in the first connecting line or the second connecting line, and the first portion of the first water inlet line is located between the second position and the first outlet.

14. The combined supply system according to any one of claims 1 to 3, wherein the high temperature heat source is: a gas heating device; the low-temperature heat source is as follows: an air energy device.

15. The combined supply system of claim 4 further comprising, a heat exchange device;

the outlet of the heat exchange device is connected with the first connecting pipeline through a third connecting pipeline;

and the inlet of the heat exchange device is connected with the second connecting pipeline through a fourth connecting pipeline.

16. The combined supply system according to claim 15, wherein the flow control means is provided at a third position where the third connecting line is connected to the first connecting line, or at a third partial line, or at a fourth position where the first connecting line is connected to the first return line; the third portion of tubing is located between the third location and the fourth location.

17. The combined supply system of claim 16, wherein the flow control device comprises any one of:

a waterway switching valve provided at the third position or the fourth position;

and the fourth electromagnetic valve is arranged on the third part pipeline.

18. The combined supply system according to claim 17, wherein a check valve or a fifth solenoid valve is provided between the second connecting line and the first outlet of the high-temperature heat source.

19. The combined supply system according to claim 17, wherein a check valve or a sixth solenoid valve is provided on the second connection line.

20. The combined supply system according to claim 17, wherein a check valve or a seventh solenoid valve is provided on the third connecting line or the fourth connecting line.

21. The combined supply system of claim 15, wherein an energy storage water tank is provided on the second connecting line.

22. The combined supply system of claim 21, wherein a bypass line for bypassing the energy-storing water tank is further provided on the second connecting line.

23. The combined supply system of claim 15, further comprising a hot water tank, the high temperature heat source and/or the low temperature heat source being in communication with the hot water tank for supplying hot water to the hot water tank.

24. The combined supply system of claim 15, wherein the heat exchange device comprises a radiant heat exchanger.

25. The control method of the combined supply system is characterized in that the combined supply system comprises a high-temperature heat source, a low-temperature heat source, a flow control device and a fan heat exchanger; the control method comprises the following steps:

26. The control method of the cogeneration system of claim 25, wherein when the second temperature difference value is not greater than the first temperature difference threshold, said control method further comprises:

27. The control method of the cogeneration system of claim 26, wherein said high temperature heat source is a gas-fired heating device, and determining said first heating cost comprises:

acquiring the gas price of the geographical area where the combined supply system is located and the first energy efficiency of the gas heating device;

28. The method of controlling an cogeneration system of claim 26, wherein said low temperature heat source is an air energy device, and wherein said determining said second heating cost for said air energy device having stored therein a first correspondence of ambient temperature, heating load, and overall energy efficiency comprises:

29. The cogeneration system of claim 26 wherein said flow control means is controlled to assume said second state to provide heat from said low temperature heat source to said fan heat exchanger when said first heating rate is greater than said second heating rate.

30. The control method of the cogeneration system of claim 26, wherein when the first heating rate is not greater than the second heating rate, the high temperature heat source is maintained to heat the fan heat exchanger.

31. The method of controlling an cogeneration system of claim 26, wherein when said second temperature difference value is not greater than said first temperature difference threshold, said method of controlling further comprises: and controlling the flow control device to be in a second state, and supplying heat to the fan heat exchanger by the low-temperature heat source.

32. The method of controlling an cogeneration system of claim 31, wherein when said second temperature difference value is greater than a first temperature difference threshold, said method of controlling further comprises: and controlling the flow control device to be in a first state, and supplying heat to the fan heat exchanger again by the high-temperature heat source.

33. The control method of the cogeneration system of claim 26, wherein when the second temperature difference value is not greater than the first temperature difference threshold, the control method further comprises: and maintaining the high-temperature heat source to supply heat to the fan heat exchanger.

34. The combined supply system control method according to any one of claims 25 to 33, wherein the fan speed of the fan heat exchanger is controlled based on the first temperature difference, and the fan speed of the fan heat exchanger is controlled by any one of the following: and the reduction is firstly unchanged and then reduced.

35. The control method of the cogeneration system of any one of claims 25 to 33, said method further comprising:

determining a required load based on the first temperature difference;

36. The combined supply system control method according to any one of claims 25 to 33, wherein the second temperature difference is a maximum value of the first temperature differences or an average value of the first temperature differences.