CN115371113A

CN115371113A - Heat exchange system and control method and controller thereof

Info

Publication number: CN115371113A
Application number: CN202110539439.1A
Authority: CN
Inventors: 李娟�; 柳飞; 辛壮壮
Original assignee: AO Smith China Water Heater Co Ltd
Current assignee: AO Smith China Water Heater Co Ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2022-11-22

Abstract

The invention discloses a heat exchange system, a control method thereof and a controller, wherein the heat exchange system comprises at least two heat exchangers, a first heat source and a second heat source which are communicated with the heat exchangers through pipelines, and a flow control device which is arranged in the pipelines and used for controlling the flow of the at least two heat exchangers, and the control method comprises the following steps: acquiring the pressure of the heat exchange system and/or the flow of the heat exchange system; and when the acquired pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source, and/or when the acquired flow of the heat exchange system is equal to or less than the preset flow of the second heat source, increasing the opening degree of the opened flow control devices and/or adjusting the opening number of the flow control devices. The heat exchange system, the control method thereof and the controller provided by the invention can improve the stability and reliability of the operation of the heat exchange system in the operation process.

Description

Heat exchange system and control method and controller thereof

Technical Field

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

Background

Currently, in order to meet the cooling and heating demands of users, air conditioning equipment having cooling and heating functions, such as a central air conditioner, a heat pump, etc., is generally used in the market. The air conditioning apparatus is greatly affected by outdoor environments such as air temperature, humidity, and the like when operating. For example, when the outdoor temperature is below zero, the outdoor unit is easily frosted, which not only results in very high defrosting energy consumption of the device, but also results in poor heating effect, and thus the heating temperature desired by the user cannot be achieved.

In order to overcome the above problems, the prior art provides a combined heating scheme, that is, based on the existing air conditioner, a hot water heating device (e.g., a wall-mounted boiler) is connected to the air conditioner, and the air conditioner and the hot water heating device are combined to heat. Especially when the outdoor temperature is low and the humidity is high, the heating effect which is satisfied by the user can be better achieved by mainly using the hot water heating equipment to heat under the working condition that frosting is easy to form.

However, the inventors found that: when air conditioning equipment and hot water heating equipment jointly heat, because operating parameter between them is different, can lead to a series of problems, finally lead to whole heat transfer system operation unstable, often appear reporting to the police, user experience is relatively poor.

Disclosure of Invention

In order to overcome at least one defect in the prior art, embodiments of the present invention provide a heat exchange system, a control method thereof, and a controller, which can give consideration to devices with different operation parameter requirements, and improve the stability and reliability of the operation of the heat exchange system during the operation process, thereby improving the user experience.

The specific technical scheme of the embodiment of the invention comprises the following steps:

a control method of a heat exchange system including at least two heat exchangers, a first heat source and a second heat source communicating with the heat exchangers through a pipeline, and a flow control device provided in the pipeline for controlling flow rates of the at least two heat exchangers, the control method comprising:

acquiring the pressure of the heat exchange system and/or the flow of the heat exchange system;

and when the acquired pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source, and/or when the acquired flow of the heat exchange system is equal to or less than the preset flow of the second heat source, increasing the opening degree of the opened flow control devices and/or adjusting the opening number of the flow control devices.

Further, the step of adjusting the opening number of the flow control device includes at least any one of the following steps:

sequentially opening the flow control devices according to a preset sequence;

randomly opening a flow control device;

opening the flow control devices one by one in a number-superposed manner;

a selected number of flow control devices are opened.

Further, the step of opening a selected number of flow control devices includes: opening part or all of the unopened flow control devices.

Further, in the process of adjusting the opening number of the flow control device, the control method further includes:

monitoring pressure fluctuations of the heat exchange system, and identifying pressure fluctuations corresponding to opening of each flow control device;

after the pressure fluctuation corresponding to each flow control device is identified, sorting the water resistance of each heat exchanger according to the difference of the influence of the flow control devices on the pressure fluctuation; and opening the flow control devices in sequence according to a preset sequence, specifically, opening the flow control devices based on a sequencing result of the water resistance of the heat exchanger.

Further, the control method further includes performing the following steps at a predetermined cycle: and after the pressure fluctuation corresponding to each flow control device is identified, sequencing the water resistance of each heat exchanger according to the difference of the flow control devices in the influence on the pressure fluctuation.

Further, the heat exchangers comprise heat exchangers with different radiation heat exchange efficiencies, and when the step of adjusting the opening number of the flow control device is executed, the heat exchangers are opened according to the sequence of the radiation heat exchange efficiencies from low to high.

Further, the heat exchanger may be in the form of a damper whose motor is not activated when the damper's flow control device is open.

Further, after the opening degree of the opened flow rate control devices reaches the maximum and/or the opening number of the flow rate control devices reaches the maximum, if the currently acquired pressure of the heat exchange system is still equal to or greater than the preset pressure of the first heat source, the control method further includes: and reducing the operating temperature of the heat exchange system.

Further, the step of reducing the operating temperature of the heat exchange system specifically includes: reducing an operating temperature of the first heat source.

Further, after the operating temperature of the first heat source is reduced to the preset temperature, if the currently obtained pressure of the heat exchange system is still equal to or greater than the preset pressure of the first heat source, the control method further includes: turning off the first heat source.

Further, the heat exchange system is provided with a circulating pump, and when the pressure of the heat exchange system is greater than or equal to the preset pressure of the first heat source and the flow rate of the heat exchange system is greater than the preset flow rate, or only when the pressure of the heat exchange system is greater than the preset pressure of the first heat source, the control method further includes: before adjusting the opening number of the flow control device, or after adjusting the opening number of the flow control device, or in the process of adjusting the opening number of the flow control device, reducing the lift of the circulating pump.

Further, the second heat source includes a compressor, and when the flow rate of the heat exchange system is smaller than the preset flow rate of the second heat source, the control method further includes: before adjusting the opening number of the flow control device, or after adjusting the opening number of the flow control device, or while adjusting the opening number of the flow control device, the operating frequency of the compressor is reduced.

Further, the step of obtaining the pressure of the heat exchange system specifically obtains the pressure of the pipeline and/or obtains the pressure of the internal pipeline of the first heat source; the step of obtaining the flow rate of the heat exchange system is specifically obtaining the flow rate of the pipeline and/or obtaining the flow rate of the fluid flowing through the second heat source.

Further, after the opening degree of the opened flow control devices reaches the maximum and/or the opening number of the flow control devices reaches the maximum, if the currently acquired pressure of the heat exchange system is still equal to or greater than the preset pressure of the first heat source and the first heat source is in a state of supplying domestic hot water to the outside, the control method further includes: the second heat source is turned off.

A controller configured to execute the control method according to any one of the above claims, the controller at least comprising an obtaining module for obtaining the pressure of the heat exchange system and/or the flow rate of the heat exchange system; and the control module is used for increasing the opening degree of the opened flow control devices and/or adjusting the opening number of the flow control devices when the acquired pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source and/or the acquired flow of the heat exchange system is equal to or less than the preset flow of the second heat source.

A heat exchange system comprises the controller, at least two heat exchangers capable of communicating with the controller, a first heat source and a second heat source communicated with the heat exchangers through pipelines, and a flow control device arranged in the pipelines and used for independently controlling the flow of the at least two heat exchangers.

Furthermore, the second heat source and the heat exchanger are communicated through a water outlet pipeline and a water return pipeline to form a circulating water channel, and the water outlet end and the water return end of the first heat source are connected in series in the circulating water channel.

Furthermore, the water outlet end and the water return end of the first heat source are arranged on the water outlet pipeline or the water return pipeline, the heat exchange system is provided with a pressure sensor, and the pressure sensor is arranged in a pipeline between the water outlet end and the first heat source or a pipeline between the water return end and the first heat source or an internal pipeline of the first heat source.

Furthermore, the heat exchange system is provided with a flow sensor, and the flow sensor is arranged in the water outlet pipeline or the water return pipeline or the internal pipeline of the second heat source.

Further, the first heat source comprises a gas water heating device, the second heat source comprises a heat pump or an air conditioner, and the heat exchanger comprises at least one of a wind disc, a floor heating device and a cooling fin or a combination of the wind disc, the floor heating device and the cooling fin.

A method of controlling a heat exchange system, the heat exchange system comprising: the heat exchanger comprises a first heat source, a second heat source and a bypass pipeline, wherein the first heat source and the second heat source are communicated with the heat exchanger through pipelines; the control method comprises the following steps: acquiring the pressure of the heat exchange system and/or the flow of the heat exchange system; and when the obtained pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source, and/or when the obtained flow of the heat exchange system is equal to or less than the preset flow of the second heat source, increasing the flow of the bypass pipeline.

Further, the step of increasing the flow rate of the bypass line includes: increasing the flow rate of the opened bypass line and/or increasing the number of openings of the bypass line.

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

according to the control method of the heat exchange system, aiming at the heat exchange system with two different heat sources, when the pressure of the heat exchange system and/or the flow of the heat exchange system is obtained and the pressure and the flow in the heat exchange system are monitored, and when the obtained pressure of the heat exchange system is equal to or larger than the preset pressure of the first heat source and/or when the obtained flow of the heat exchange system is equal to or smaller than the preset flow of the second heat source, the pressure and the flow can be adjusted by increasing the opening degree of the opened flow control devices and/or adjusting the opening number of the flow control devices, so that the pressure and the flow can meet the requirements of the preset value, the problem that the water pressure of the heat exchange system rises can be solved, the advance protection is achieved, and the problem that the system cannot be normally locked due to frequent pressure relief and high-pressure alarm is avoided; the alarm caused by low flow of the heat exchange system can be solved, the equipment with different operation parameter requirements can be taken into consideration as a whole, the stability and the reliability of the operation of the heat exchange system are improved in the operation process, and therefore the use experience of a user is improved.

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 flow chart illustrating the steps of a method for controlling a heat exchange system according to one embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a heat exchange system provided in an embodiment of the present application;

FIG. 3 is a flow chart illustrating steps of a method for controlling a heat exchange system according to another embodiment of the present application;

FIG. 4 is a schematic diagram of a heat exchange system according to another embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a heat exchange system according to still another embodiment of the present application.

Reference numerals of the above figures:

1. a first heat source; 11. a first circulation pump;

2. a second heat source; 21. a compressor; 22. a second circulation pump;

31. a wind plate; 32. floor heating; 33. a heat sink;

4. a flow control device;

51. a water outlet pipeline; 52. a water return pipeline;

6. 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 and not restrictive of 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 of the present application.

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.

The embodiment of the application specification provides a heat exchange system, a control method thereof and a controller.

As shown in fig. 2, the heat exchange system may at least include: the heat source system comprises at least two heat exchangers, a first heat source 1 and a second heat source 2 which are communicated with the heat exchangers through pipelines, and a flow control device 4 which is arranged in the pipelines and used for controlling the flow of the at least two heat exchangers.

Wherein, the heat exchanger comprises at least one of a wind disk 31, a floor heating 32 and a cooling fin 33 or the combination thereof. The operating parameters of the first heat source 1 differ from the operating parameters of the second heat source 2. In particular, the difference in operating parameters between the first and

second heat sources

1 and 2 may vary depending on the particular type of first and

second heat sources

1 and 2. For example, the first heat source 1 may include a gas-fired hot water apparatus, and the second heat source 2 may include a heat pump or an air conditioner. In the embodiments of the present specification, the first heat source 1 is mainly used as a wall-hanging stove, the second heat source 2 is used as a heat pump, and other different types of heat sources can be adaptively adjusted according to the type of the heat source, and the present application is not expanded one by one. When the heat pump and the wall-mounted furnace simultaneously supply heat to the heat exchanger through pipelines (hereinafter referred to as dual-energy operation), at least the following problems exist:

firstly, the operating maximum water pressure ranges of the heat pump and the wall-hanging stove are inconsistent: generally, the maximum water pressure for operation of the wall-hanging stove design is less than the maximum water pressure for operation of the heat pump design. Secondly, the operating flow range of heat pump and hanging stove is inconsistent: the heat pump is a heat exchange device with high flow and small temperature difference, in order to ensure that the heat pump can normally complete a heat exchange function, the flow of the heat pump cannot be lower than the designed minimum operation flow to operate, and the wall-mounted boiler is not limited by the minimum flow.

However, the inventors found that: when the dual energy operation is performed, the heat exchange system cannot normally operate if any one or a combination of the following conditions occurs: for example, when the initial moisturizing pressure of circulation system is too high, the circulating pump joins in marriage greatly, the expansion drum inefficacy etc. above-mentioned condition probably causes the water pressure of hanging stove to exceed a definite value, can cause the frequent pressure release of hanging stove during the worst, perhaps hanging stove is high-pressure warning many times, finally probably leads to heat transfer system to lock and can not normal operating.

In addition, when the heat pump system is operated for a long time, the heat exchange system may have a flow rate attenuation phenomenon for some reasons. The main reasons for the occurrence of flow attenuation may include: the heat exchange system has foreign matters in the circulating pipeline to cause semi-blocking, welding beading at the pipeline joint, failure of a differential pressure valve and the like. After the flow rate attenuation occurs, the flow rate of the heat pump may be lower than the minimum operation flow rate, and at this time, the heat pump may give an alarm for many times because the flow rate is too small, and finally, the system is locked and cannot operate normally.

In order to give consideration to equipment with different operation parameter requirements during dual-energy operation, so that the stability and reliability of the operation of the heat exchange system are improved in the operation process, and the use experience of a user is improved, the specification provides a control method of the heat exchange system.

Referring to fig. 1, the method for controlling the heat exchange system may include the following steps:

step S10: acquiring the pressure of the heat exchange system and/or the flow of the heat exchange system;

step S12: and when the obtained pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source 1, and/or when the obtained flow of the heat exchange system is equal to or less than the preset flow of the second heat source 2, increasing the opening degree of the opened flow control device 4 and/or adjusting the opening number of the flow control device 4.

In this specification, the pressure of the heat exchange system may be obtained separately, the flow rate of the heat exchange system may be obtained separately, or the pressure and the flow rate of the heat exchange system may be obtained simultaneously.

In particular, it can be adapted to the different requirements of the actual heat source type and operating parameters. For example: for some embodiments, when the first heat source 1 is a wall-hanging furnace and the second heat source 2 is a heat pump, at the initial stage of operation of the heat exchange system, the flow rate of the heat exchange system is relatively high, and when the probability of the occurrence of too low flow rate is relatively low, only the pressure of the heat exchange system may be obtained. For example, in other embodiments, the flow rate of the heat exchange system may be obtained only when it is ensured that the operating pressure of the second heat source 2 is not too high. Of course, when the pressure and flow information of the heat exchange system are obtained at the same time, the stability and reliability of the operation of the heat exchange system can be more reliably ensured.

And after at least one of the pressure of the heat exchange system and the flow of the heat exchange system is obtained, comparing the obtained pressure and flow information with preset values. When at least one of the acquired pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source 1 and the acquired flow of the heat exchange system is equal to or less than the preset flow of the second heat source 2 is established, the heat exchange system may alarm, and at this time, the pressure and the flow of the heat exchange system can be regulated and controlled by at least one of the manners of increasing the opening degree of the opened flow control devices 4, adjusting the opening number of the flow control devices 4 and the like, so that the pressure and the flow of the heat exchange system meet the preset value requirements.

In this specification, it is to be noted that: the step of obtaining the pressure of the heat exchange system may specifically be obtaining the pressure of the pipeline and/or obtaining the internal pipeline pressure of the first heat source 1.

The first heat source 1 may be a heat source whose operating pressure cannot be higher than a preset pressure, and specifically, may be a gas heat exchanger, such as a wall-mounted furnace, a gas water heater, or the like. Of course, the first heat source 1 may also be another type of heat source whose operating pressure cannot be exceeded. In the embodiment of the present specification, the first heat source 1 is exemplified by a wall-mounted furnace in a gas heat exchanger. When the first heat source 1 is a wall-hanging stove, the preset pressure of the wall-hanging stove may be 3BAR. Of course, the preset pressure is a parameter value designed for a home environment, and if the wall-mounted boiler is applied to other scenes, for example, a commercial environment with a large water demand, the preset pressure may be adaptively adjusted, and the specific application is not limited herein.

In this specification, it is to be noted that: the step of obtaining the flow rate of the heat exchange system may specifically be obtaining the flow rate of the pipeline and/or obtaining the flow rate of the fluid flowing through the second heat source 2.

The second heat source 2 may be a heat source whose operation flow rate cannot be lower than a preset flow rate, and specifically, may be in the form of a heat pump, an air conditioner, or the like. Of course, the second heat source 2 may be another heat source type whose operation flow rate cannot be too low. In the embodiment of the present specification, the second heat source 2 is exemplified as a heat pump. When the second heat source 2 is a heat pump, the preset flow rate (i.e., the minimum operation flow rate) of the heat pump may be 1.1m3/H. Of course, the preset flow rate is also a parameter value designed for domestic environment, and if the heat pump is applied in other situations, such as commercial environment with large water demand, the preset flow rate can be adjusted adaptively, and the specific application is not limited herein.

When any one of the pressure and the flow of the heat exchange system exceeds the standard, that is, when the acquired pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source 1, and/or when the acquired flow of the heat exchange system is equal to or less than the preset flow of the second heat source 2, the control can be performed by increasing the opening degree of the opened flow control devices 4 and/or adjusting the opening number of the flow control devices 4, so as to reduce the pressure of the heat exchange system and increase the flow of the heat exchange system.

In this specification, for each heat exchanger, a flow control device 4 capable of controlling the flow rate of the controller is provided in a matching manner. Specifically, the flow control device 4 may be in the form of a valve for controlling on/off of the branch in which the heat exchanger is located, or the flow control device 4 may be in the form of a valve capable of adjusting an opening degree, so as to adjust a flow of the branch in which the heat exchanger is located. When the heat exchanger is in the form of a valve with non-adjustable flow, the pressure and the flow of the heat exchange system can be adjusted by adjusting the opening number of the flow control device 4. When the heat exchanger is in the form of a valve with adjustable flow, the pressure and the flow of the heat exchange system can be adjusted by increasing the opening degree of the opened flow control device 4, and of course, the pressure and the flow of the heat exchange system can also be adjusted by adjusting the opening number of the flow control device 4.

The procedure for adjusting the number of openings of the flow control device 4 will be explained below. The step of adjusting the number of openings of the flow control device 4 may include at least any one of the following: sequentially opening the flow control devices according to a preset sequence; randomly opening a flow control device; opening the flow control devices one by one in a number-superposed manner; a selected number of flow control devices are opened.

Aiming at the first adjusting mode: when it is necessary to adjust the number of activations of the flow control device 4, the activations may be sequentially performed in a predetermined order. Specifically, before opening sequentially in sequence, the flow control devices may be numbered and stored, and the sequential opening in sequence in accordance with a predetermined sequence may be opening in sequence in accordance with the number, for example, the heat exchange system includes three flow control devices, the corresponding storage numbers of which are respectively a first number, a second number and a third number, and when the sequential opening in sequence in accordance with the predetermined sequence may be opening first in sequence in accordance with the number; closing the first number and then opening the second number; and finally, closing the second number, and then opening the third number to sequentially open the corresponding flow control devices. Further, the difference in the performance parameter (for example, the size of the water resistance) of the flow rate control device 4 may be stored in order, and the opening in the predetermined order may be performed in order of the size of the parameter. The sequence of the performance parameters of the flow control device 4 may be stored in a memory of the heat exchange system before the heat exchange system is used for the first time, or may be obtained through self-learning during the use process. When the opening is performed in sequence according to the water resistance, the adjustment accuracy and efficiency are improved.

For the second adjustment mode: when it is desired to adjust the number of openings of the flow control device 4, one flow control device can be randomly opened. When a certain flow control device is opened randomly, complex control logic does not need to be considered, only the change condition of the system pressure and/or flow needs to be monitored in real time, and the adjustment can be stopped when the system pressure and flow meet the requirements of preset values.

For the third adjustment mode: when it is necessary to adjust the opening number of the flow control devices 4, the flow control devices may be opened one by one in a number-superimposed manner. Specifically, for unopened flow control devices, one flow control device may be opened first; if the pressure and the flow do not meet the requirements of preset values at the moment, opening one flow control device (namely opening two unopened flow control devices), and if the pressure and the flow do not meet the requirements of the preset values at the moment, opening one flow control device (namely opening three unopened flow control devices) \8230; \8230, and so on until the preset values of the pressure and the flow are met.

For the fourth adjustment mode: when it is desired to adjust the number of opening of the flow control means 4, a selected number of flow control means can be opened. Specifically, the step of opening a selected number of flow control devices may include: opening part or all of the unopened flow control devices.

In the present embodiment, the flow rate control devices 4 that are opened by the selected number may be partially opened flow rate control devices or fully opened flow rate control devices. For example, when the flow control device is not opened, it includes: the first control valve, the second control valve, and the third control valve may be opened, one of them may be opened, a combination of both of them may be opened, or all of them may be opened. Wherein, the purpose of pressure reduction/flow increase is directly achieved in the most reliable and most direct mode by fully opening the unopened flow control device. However, in some cases, in order to avoid the temperature drop caused by full opening, or in other cases, the pressure exceeding value or the flow rate shortage value is not very large, and under the condition that full opening is not needed, the effect of matching the current working condition of the heat exchange system can be achieved by partial opening. Further, in the process of adjusting the opening number of the flow control device 4, the control method may further include:

step S13: monitoring the pressure fluctuation of the heat exchange system, and identifying the pressure fluctuation corresponding to the opening of each flow control device;

step S15: and after the pressure fluctuation corresponding to each flow control device is identified, sequencing the water resistance of each heat exchanger according to the difference of the flow control devices in the influence on the pressure fluctuation. And opening the flow control devices in sequence according to a preset sequence, specifically, opening the flow control devices based on a sequencing result of the water resistance of the heat exchanger.

In this embodiment, in the process of adjusting the number of the flow rate control devices 4, the amount of pressure fluctuation of the heat exchange system caused by each flow rate control device can be obtained. The amount of pressure fluctuation generated by the flow control device 4 to the heat exchange system is directly proportional to the water resistance of the heat exchanger. Therefore, based on the obtained pressure fluctuation amount brought by each flow control device to the heat exchange system, the water resistance of the heat exchanger can be sorted, and the sorting result can be stored in the memory of the heat exchange system subsequently.

After the sorting about the size of the water resistance of the heat exchanger is stored in the heat exchange system, for the first adjusting mode, the flow control device can be opened for the sorting structure based on the size of the water resistance of the heat exchanger. For example, the flow control devices may be sequentially opened in the order of increasing water resistance from the heat exchanger with the smallest water resistance (i.e., the most significant pressure and flow increasing effect), so as to efficiently screen out the combinations of flow heat exchangers that need to be opened.

With the operation of the heat exchange system, the water resistances of the heat exchangers may be changed to different degrees, and the sequence of the water resistances of the corresponding heat exchangers may be changed. In order to monitor the condition that the water resistance of the heat exchanger changes in the using process, the control method can further comprise the following steps which are executed in a preset period: and after the pressure fluctuation corresponding to each flow control device is identified, sequencing the water resistance of each heat exchanger according to the difference of the flow control devices in the influence on the pressure fluctuation. The predetermined period may be set according to an actual product type and an environment in which the product is applied, and the application is not limited in this application.

In one embodiment, the heat exchanger may be in the form of a damper 31, and the motor of the damper 31 is not activated when the flow control device 4 of the damper 31 is opened.

When the heat exchanger is in the form of a winddisk 31 and the winddisk 31 is open at the flow control device 4, the motor is not started. Because the inside heat transfer part size of this wind dish 31 is less, when the motor of this wind dish 31 did not start, this wind dish 31 air-out, only has a small amount of heat exchanges between heat transfer part position and air, and the radiation heat exchange efficiency is very low this moment, can not lead to the fact the temperature fluctuation of big amplitude abnormity to the room at this wind dish 31 place to be favorable to guaranteeing the use experience of user's preferred.

In one embodiment, the heat exchangers may include heat exchangers having different radiant heat exchange efficiencies, and the steps of adjusting the opening number of the flow control device 4 are performed in the order of the radiant heat exchange efficiency from low to high.

Specifically, the heat exchanger may include: air plate 31, ground heating 32, and heat sink 33. Of course, the heat exchanger may take other forms. Different heat exchangers have different radiant heat exchange efficiencies due to different structures, heat exchange sizes and the like. For the air disk 31, which has a smaller wind radiation heat exchange area before the fan is started, the radiation heat exchange efficiency is the lowest, and the flow control device 4 corresponding to the air disk 31 can be preferentially adjusted. For the floor heating 32 or the radiating fins 33, the radiant heat exchange area is large, the radiant heat exchange efficiency is high, and after the flow control devices 4 corresponding to the fan heat exchangers are adjusted, whether the flow control devices 4 corresponding to the floor heating 32 or the radiating fins 33 need to be further adjusted or not can be judged. Specifically, the radiant heat exchange efficiency of the floor heating 32 and the heat dissipation fins 33 can be sorted according to the difference of the total heat exchange area, for example, when the total heat exchange area of the floor heating 32 is larger than the heat dissipation fins 33, the flow control device 4 corresponding to the floor heating 32 can be turned on last. The flow control devices 4 corresponding to the heat exchangers are opened in sequence from low to high in the safety radiation heat exchange efficiency, so that abnormal temperature fluctuation can be reduced as much as possible.

Aiming at a heat exchange system with two different heat sources, the pressure and the flow of the heat exchange system are obtained, and the pressure and the flow in the heat exchange system are monitored, when the obtained pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source 1, and/or when the obtained flow of the heat exchange system is equal to or less than the preset flow of the second heat source 2, the pressure and the flow are adjusted by increasing the opening degree of the opened flow control device 4 and/or adjusting the opening number of the flow control device 4, so that the pressure and the flow can meet the requirements of the preset values, the problem of water pressure rise of the heat exchange system can be solved, the protection is carried out in advance, and the problem that the system cannot normally operate due to frequent pressure relief and high-pressure alarm is avoided; the alarm caused by low flow of the heat exchange system can be solved, the equipment with different operation parameter requirements can be taken into consideration as a whole, the stability and the reliability of the operation of the heat exchange system are improved in the operation process, and therefore the use experience of a user is improved.

Further, the control method may further include step S14: after the opening degree of the opened flow control devices 4 reaches the maximum and/or the opening number of the flow control devices 4 reaches the maximum, if the currently acquired pressure of the heat exchange system is still equal to or greater than the preset pressure of the first heat source 1, the operating temperature of the heat exchange system is reduced.

In the present embodiment, when the opening degree of the opened flow rate control device 4 reaches the maximum and/or the opening number of the flow rate control device 4 reaches the maximum, the pressure of the heat exchange system cannot be affected any more by adjusting the flow rate control device 4, and at this time, the operating temperature of the heat exchange system may be reduced.

Wherein the step of reducing the operating temperature of the heat exchange system may specifically include: the operating temperature of the first heat source 1 is reduced. The operation temperature of the first heat source 1 may specifically be an actual working temperature (for example, an outlet water temperature), a target temperature set by a user, and the like, and when the operation temperature of the first heat source 1 is reduced, the pressure inside the first heat source 1 can be reduced, and then the internal pressure of the first heat source 1 may be reduced to be lower than a preset pressure, so that a requirement for stable operation of the heat exchange system is met.

Specifically, taking the operating temperature of the first heat source 1 as the target temperature set by the user as an example, when the operating temperature of the first heat source 1 is decreased, the decreasing may be started step by step with a predetermined temperature gradient (for example, 5 degrees) starting from the original target temperature (for example, 65 degrees celsius) set by the user, and in the process of decreasing, it is determined whether the current pressure has decreased below the preset pressure, and if so, the decreasing is stopped, and the operation is performed at the current target temperature.

Further, after reducing the operating temperature of the first heat source 1 to a preset temperature, if the currently obtained pressure of the heat exchange system is still equal to or greater than the preset pressure of the first heat source 1, the control method further includes step S16: the first heat source 1 is turned off.

The preset temperature may be the lowest operating temperature of the first heat source 1. When the first heat source 1 is a wall-hanging stove, the minimum operating temperature may be a temperature value between 35 degrees celsius and 40 degrees celsius.

In some embodiments, the heat exchange system is provided with a circulation pump, and the control method may further include, only when the pressure of the heat exchange system is greater than the preset pressure of the first heat source, or when the pressure of the heat exchange system is greater than the preset pressure of the first heat source 1 and the flow rate of the heat exchange system is greater than a preset flow rate: the head of the circulation pump is reduced before the number of opening of the flow control device 4 is adjusted, or after the number of opening of the flow control device 4 is adjusted, or in the process of adjusting the number of opening of the flow control device 4.

In this embodiment, the heat exchange system may be provided with a circulation pump for providing fluid flow power. Specifically, a first circulation pump 11 may be disposed in the first heat source 1 or at a water outlet end of the first heat source 1, and a second circulation pump 22 may be disposed in the second heat source 2 or at a water inlet end of the second heat source 2.

When the pressure of the heat exchange system is greater than the preset pressure of the first heat source 1, the flow can be kept unchanged by adjusting the control of a circulating pump in the system, and the lift of the circulating pump is reduced, so that the circulating pressure of the system is reduced.

Specifically, to the circulating pump, it can match under same flow has different lifts, when keeping under the unchangeable condition of flow, when reducing the lift of this circulating pump, generally, the lift = vertical height + pipe-line loss + outlet pressure, and wherein vertical height and pipe-line loss are unchangeable, and then outlet pressure must reduce, can reduce heat exchange system pressure promptly.

In addition, in the adjusting process of the circulating pump lift, the flow is reduced for unlimited reduction of the lift, other alarms appear, and when the flow of the heat exchange system has the adjusting allowance, the pressure of the heat exchange system can be reduced by reducing the circulating pump lift and reducing the flow of the heat exchange system to a certain extent.

Specifically, when the pressure of the heat exchange system is greater than or equal to the preset pressure of the first heat source and the flow rate of the heat exchange system is greater than the preset flow rate, the step of reducing the lift of the circulation pump may also be performed.

Wherein, the preset flow rate may be: during the process of reducing the lift, the flow rate of an alarm caused by other factors (such as too low flow rate) in the heat exchange system is ensured. The specific form of the preset flow rate may be a certain set flow rate value, a difference value of the flow rate, a percentage interval of flow rate reduction, and the like. In addition, the specific numerical value of this preset flow can be different according to the circulating pump and the difference of the heat exchange system that this circulating pump belongs to, and this application does not do the restriction on specific numerical value here.

In the adjusting process, the lift of the first circulating pump 11 and the lift of the second circulating pump 22 can be reduced at the same time, the lift of one of the circulating pumps can also be reduced at first, the pressure change condition of the heat exchange system is judged, and if the pressure is reduced to a preset value, the lift of the other circulating pump does not need to be adjusted. For example, the lift of the second circulation pump 22 may be reduced first, then the pressure variation of the heat exchange system is determined, and if the pressure has been reduced to a preset value, the lift of the first circulation pump 11 is not adjusted; if the pressure has not decreased to the preset value at this time, the head of the first circulation pump 11 can be further adjusted.

In some embodiments, the second heat source 2 includes a compressor 21, and when the flow rate of the heat exchange system is less than the preset flow rate of the second heat source 2, the control method may further include: the operating frequency of the compressor 21 is reduced before the number of opening of the flow control device 4 is adjusted, or after the number of opening of the flow control device 4 is adjusted, or while the number of opening of the flow control device 4 is adjusted.

In the present embodiment, the second heat source 2 (e.g., a heat pump) includes a compressor 21, and the compressor 21 is embodied as an inverter compressor 21 whose operating frequency can be adjusted. When the flow rate of the heat exchange system is smaller than the preset flow rate of the second heat source 2, in order to ensure that the heat pump can normally operate, the boundary condition of the heat pump with respect to the flow rate can be widened by adjusting the frequency of the compressor 21. For example, when the frequency of the compressor 21 is not adjusted, the heat pump requires a flow rate not lower than a preset flow rate. When the frequency of the compressor 21 is reduced, the rotation speed of the compressor 21 can be reduced, the flow rate of the refrigerant can be reduced, and the flow rate of the heated water side can be reduced according to the energy conservation principle as the whole heat exchange quantity of the heat pump refrigerant side is reduced, namely the flow rate of the water in the heat pump can be reduced. In one embodiment, after the opened flow control device 4 reaches the maximum opening degree and/or the opened number of the flow control devices reaches the maximum opening number, if the currently acquired pressure of the heat exchange system is still equal to or greater than the preset pressure of the first heat source 1 and the first heat source 1 is in a state of supplying domestic hot water to the outside, the control method further includes: the second heat source 2 is turned off.

In this embodiment, after the opening degree of the opened flow control device 4 reaches the maximum and/or the opening number of the flow control devices reaches the maximum, if the currently obtained pressure of the heat exchange system is still equal to or greater than the preset pressure of the first heat source 1, that is, under the condition that the pressure cannot be adjusted by simply adjusting the flow control devices, the first heat source 1 is in the state of supplying domestic hot water to the outside, at this time, in order to ensure that a user can normally obtain domestic hot water, the operating temperature of the first heat source 1 is not reduced, and the pressure can be reduced by closing the second heat source 2.

Referring to fig. 4 and 5 in combination, the present specification further provides a method for controlling a heat exchange system, where the heat exchange system includes: the heat exchanger, through the first heat source 1 and the second heat source 2 of pipeline and heat exchanger intercommunication, with the bypass pipeline 6 of heat exchanger parallel connection.

In other embodiments provided in the present specification, the heat exchanger may be provided with a bypass line 6 in parallel, and the bypass line 6 is controlled to perform the functions of pressure relief and flow increase. Specifically, the number of the bypass lines 6 may be one or more, and the present application is not limited to this. As shown in fig. 4, the bypass line 6 may be a bypass branch independent from the heat exchanger, and the bypass branch may be provided with the flow control device 4; in addition, as shown in fig. 5, a multi-way valve structure may be further disposed in the pipeline where the heat exchanger is located, a bypass branch is connected through the multi-way valve, one end of the bypass branch is connected with the multi-way valve, and the other end is connected to the water outlet pipeline 51. The multi-way valve may be a three-way valve, or a four-way valve or a valve structure having more ports, and the structure of the multi-way valve may be different according to the number of the bypass branches, which is not specifically limited herein.

Referring to fig. 3, the method for controlling the heat exchange system with the bypass line 6 may include the following steps:

step S20: acquiring the pressure of the heat exchange system and/or the flow of the heat exchange system;

step S22: and when the obtained pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source 1 and/or when the obtained flow of the heat exchange system is equal to or less than the preset flow of the second heat source 2, increasing the flow of the bypass pipeline 6.

In this embodiment, the step of obtaining the pressure of the heat exchange system and/or the flow rate of the heat exchange system may refer to step S10, and details of this application are not repeated herein.

The step of increasing the flow rate of the bypass line 6 may specifically include: increasing the flow of the opened bypass line 6 and/or increasing the number of openings of said bypass line 6.

When a valve with adjustable flow is arranged in the bypass pipeline 6, the flow of the bypass pipeline 6 can be increased by adjusting the opening degree of the valve. Furthermore, at least one bypass line 6 may be provided with an unopened valve, which may be opened when an increase of the flow through the bypass line 6 is probably required. Furthermore, these two operations may also be performed simultaneously.

The present application also provides a controller configured to be able to execute the control method provided in any one of the above embodiments. The controller includes at least: the acquisition module is used for acquiring the pressure of the heat exchange system and/or the flow of the heat exchange system; and the control module is used for increasing the opening degree of the opened flow control device 4 and/or adjusting the opening number of the flow control device 4 when the acquired pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source 1 and/or the acquired flow of the heat exchange system is equal to or less than the preset flow of the second heat source 2.

The obtaining module is used for obtaining the pressure of the heat exchange system and/or the flow of the heat exchange system. The specific form of the obtaining module may be different according to the target parameter that needs to be obtained, and the application is not limited in this respect. The control module is used for increasing the opening degree of the opened flow control device 4 and/or adjusting the opening number of the flow control device 4 when the acquired pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source 1 and/or when the acquired flow of the heat exchange system is equal to or less than the preset flow of the second heat source 2. The working principle of the controller and the technical effects that can be achieved by the controller can refer to the detailed description of the control method, and the details are not repeated herein.

Referring to fig. 2, 4 and 5, the present specification also provides a heat exchange system, which may include: the controller comprises at least two heat exchangers which can be communicated with the controller, a first heat source 1 and a second heat source 2 which are communicated with the heat exchangers through pipelines, and a flow control device 4 which is arranged in the pipelines and used for independently controlling the flow of the at least two heat exchangers.

In this embodiment, the controller can communicate with the first and

second heat sources

1, 2 and the heat exchanger. The controller may be independently disposed with the first heat source 1 and the second heat source 2, or may be integrally disposed with the first heat source 1 or the second heat source 2, and the specific application is not specifically limited herein. When in use, the controller can be communicated with the first heat source 1, the second heat source 2, the heat exchanger, an electric control element in a pipeline and the like.

The first heat source 1 is also a heating apparatus capable of supplying heat. Specifically, the first heat source 1 may be a gas-fired water heating device, and of course, the second heat source 2 may also be other heating devices capable of supplying heat, such as other new energy heating devices. When the first heat source 1 is a gas water-burning device, it may be in the form of a wall-hanging stove, a gas water heater, or the like. In this specification, the second heat source 2 is mainly illustrated by a wall-hanging stove, and other forms can be referred to by analogy, and the description of the present application is not repeated.

The second heat source 2 is an air conditioning apparatus capable of cooling and heating. Specifically, the first heat source 1 may be a heat pump water heater, and may be an air conditioner. In the present specification, the second heat source 2 is mainly illustrated as a heat pump water heater (heat pump for short), other forms can be referred to by analogy, and the description of the present application is omitted.

The second heat source 2 and the heat exchanger are communicated through a water outlet pipeline 51 and a water return pipeline 52 to form a circulating water channel, and the water outlet end and the water return end of the first heat source 1 are connected in series in the circulating water channel. When the first heat source 1 is connected in series in the circulating water path, the pressure communication between the first heat source 1 and the second heat source 2, especially the pressure fluctuation of the second heat source 2 can affect the first heat source 1.

The water outlet end and the water return end of the first heat source 1 are arranged on the water outlet pipeline 51 or the water return pipeline 52. The heat exchange system is provided with a pressure sensor, and the pressure sensor is arranged in a pipeline between the water outlet end and the first heat source 1 or a pipeline between the water return end and the first heat source 1 or an internal pipeline of the first heat source 1.

The pressure sensor is used for acquiring the pressure of the heat exchange system. When the pressure sensor is disposed at the above-mentioned position (particularly, when disposed in the internal pipe of the first heat source 1), it is possible to ensure that the acquired pressure value is the pressure of the internal pipe of the wall-hanging stove.

The heat exchange system is provided with a flow sensor, and the flow sensor is arranged in the water outlet pipeline 51 or the water return pipeline 52 or the internal pipeline of the second heat source 2.

The flow sensor is used for acquiring the flow of the heat exchange system. When the flow sensor is disposed at the above-mentioned position (particularly, when disposed in the internal pipe of the second heat source 2), it is possible to ensure that the acquired flow value is the heat pump internal pipe pressure.

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, the meaning of "a plurality" is 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 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 control method of a heat exchange system, the heat exchange system comprising at least two heat exchangers, a first heat source and a second heat source which are communicated with the heat exchangers through pipelines, and a flow control device which is arranged in the pipelines and is used for controlling the flow of the at least two heat exchangers, the control method comprising:

2. The method of claim 1, wherein the step of adjusting the number of openings of the flow control device comprises at least any one of the following:

sequentially opening the flow control devices according to a preset sequence;

randomly opening a flow control device;

opening the flow control devices one by one in a quantity superposition mode;

a selected number of flow control devices are opened.

3. The method of claim 2 wherein said step of opening a selected number of flow control devices comprises: opening part or all of the unopened flow control devices.

4. The method of controlling a heat exchange system according to claim 2, wherein in adjusting the number of activations of the flow control device, the method further comprises:

after the pressure fluctuation corresponding to each flow control device is identified, sorting the water resistance of each heat exchanger according to the difference of the influence of the flow control devices on the pressure fluctuation; and opening the flow control devices in sequence according to a preset sequence, specifically, opening the flow control devices based on the sequencing result of the water resistance of the heat exchanger.

5. The method of controlling a heat exchange system of claim 4, further comprising the steps of, at a predetermined cycle: and after the pressure fluctuation corresponding to each flow control device is identified, sequencing the water resistance of each heat exchanger according to the difference of the flow control devices in the influence on the pressure fluctuation.

6. The method for controlling a heat exchange system according to claim 1, wherein the heat exchangers include heat exchangers having different radiant heat exchange efficiencies, and the step of adjusting the number of the flow control devices is performed by turning on the radiant heat exchange efficiencies in the order of low to high.

7. A method of controlling a heat exchange system according to any one of claims 1 to 6 wherein the heat exchanger is in the form of a stack comprising a winddisk, the motor of which is not activated when the flow control means of the winddisk is open.

8. The method of controlling a heat exchange system according to any one of claims 1 to 6, wherein after the opening degree of the opened flow control device reaches a maximum and/or the opening number of the flow control device reaches a maximum, if the currently obtained pressure of the heat exchange system is still equal to or greater than the preset pressure of the first heat source, the method further comprises:

and reducing the operating temperature of the heat exchange system.

9. The method of claim 8, wherein the step of reducing the operating temperature of the heat exchange system comprises:

reducing an operating temperature of the first heat source.

10. The method of claim 9, wherein after the operating temperature of the first heat source is reduced to a predetermined temperature, if the currently obtained pressure of the heat exchange system is still equal to or greater than the predetermined pressure of the first heat source, the method further comprises: turning off the first heat source.

11. The method for controlling a heat exchange system according to any one of claims 1 to 6, wherein the heat exchange system is provided with a circulation pump, and when the pressure of the heat exchange system is greater than or equal to the preset pressure of the first heat source and the flow rate of the heat exchange system is greater than the preset flow rate, or only when the pressure of the heat exchange system is greater than the preset pressure of the first heat source, the method further comprises:

before adjusting the opening number of the flow control device, or after adjusting the opening number of the flow control device, or in the process of adjusting the opening number of the flow control device, reducing the lift of the circulating pump.

12. The method of controlling a heat exchange system according to any one of claims 1 to 6, wherein the second heat source includes a compressor, and when the flow rate of the heat exchange system is less than a preset flow rate of the second heat source, the method further comprises:

before adjusting the opening number of the flow control device, or after adjusting the opening number of the flow control device, or while adjusting the opening number of the flow control device, the operating frequency of the compressor is reduced.

13. The method for controlling a heat exchange system according to any one of claims 1 to 6, wherein the step of obtaining the pressure of the heat exchange system is specifically obtaining the pressure of the pipeline and/or obtaining the internal pipeline pressure of the first heat source; the step of obtaining the flow rate of the heat exchange system is specifically obtaining the flow rate of the pipeline and/or obtaining the flow rate of the fluid flowing through the second heat source.

14. The method of controlling a heat exchange system according to any one of claims 1 to 6, wherein after the opening degree of the opened flow control device reaches a maximum and/or the opening number of the flow control device reaches a maximum, if the currently obtained pressure of the heat exchange system is still equal to or greater than the preset pressure of the first heat source and the first heat source is in a state of supplying domestic hot water to the outside, the method further comprises: the second heat source is turned off.

15. A controller, characterized in that the controller is configured to execute the control method according to any one of claims 1 to 14, the controller comprising at least,

the acquisition module is used for acquiring the pressure of the heat exchange system and/or the flow of the heat exchange system;

and the control module is used for increasing the opening degree of the opened flow control devices and/or adjusting the opening number of the flow control devices when the acquired pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source and/or the acquired flow of the heat exchange system is equal to or less than the preset flow of the second heat source.

16. A heat exchange system comprising a controller according to claim 15, at least two heat exchangers capable of communicating with the controller, a first heat source and a second heat source in communication with the heat exchangers via conduits, and flow control means disposed in the conduits for independently controlling the flow of the at least two heat exchangers.

17. The heat exchange system of claim 16, wherein the second heat source and the heat exchanger are communicated through a water outlet pipeline and a water return pipeline to form a circulating water channel, and the water outlet end and the water return end of the first heat source are connected in series in the circulating water channel.

18. The heat exchange system of claim 17, wherein the water outlet end and the water return end of the first heat source are disposed on the water outlet pipeline or the water return pipeline, and the heat exchange system is provided with a pressure sensor disposed in a pipeline between the water outlet end and the first heat source or a pipeline between the water return end and the first heat source or an internal pipeline of the first heat source.

19. The heat exchange system of claim 17, wherein the heat exchange system is provided with a flow sensor disposed in the water outlet line or the water return line or an internal line of the second heat source.

20. A heat exchange system according to any one of claims 16 to 19, wherein the first heat source comprises a gas-fired hot water unit, the second heat source comprises a heat pump or an air conditioner, and the heat exchanger comprises at least one of a wind pan, a floor heating, a heat sink, or a combination thereof.

21. A method of controlling a heat exchange system, the heat exchange system comprising: the heat exchanger comprises a first heat source, a second heat source and a bypass pipeline, wherein the first heat source and the second heat source are communicated with the heat exchanger through pipelines; the control method comprises the following steps:

and when the acquired pressure of the heat exchange system is equal to or greater than the preset pressure of the first heat source and/or when the acquired flow of the heat exchange system is equal to or less than the preset flow of the second heat source, increasing the flow of the bypass pipeline.

22. The method of controlling a heat exchange system of claim 21, wherein the step of increasing the flow rate of the bypass line comprises: increasing the flow rate of the opened bypass line and/or increasing the number of openings of the bypass line.