Double-heat-source heat exchange unit

Abstract

The utility model provides a double-heat-source heat exchange unit. The double-heat-source heat exchange unit comprises a gas-liquid heat exchange pipeline and a liquid-liquid heat exchange pipeline which are connected. The gas-liquid heat exchange pipeline comprises a gas-liquid heat exchanger, and the gas-liquid heat exchanger comprises a first heat source inlet, a first heat source outlet, a first cold source inlet and a first cold source outlet; the liquid-liquid heat exchange pipeline comprises a liquid-liquid heat exchanger, and the liquid-liquid heat exchanger comprises a second heat source inlet, a second heat source outlet, a second cold source inlet and a second cold source outlet; the first cold source inlet communicates with the second cold source inlet and is used for being connected with a user heat supply outlet pipeline. The cold source first outlet communicates with the cold source second outlet and is used for being connected with a user heat supply inlet pipeline; the first heat source outlet is communicated with the second cold source inlet through a condensate supplement two-network branch, and the first heat source outlet is communicated with the first cold source inlet through a condensate supplement two-network branch. The double-heat-source heat exchange unit is simple in structure, convenient to use, capable of effectively improving the resource utilization rate, good in stability and capable of saving energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, in particular to a double heat source heat exchange unit. BACKGROUND

[0002] The heat exchange unit is a complete set of equipment composed of heat exchangers, temperature control valve groups, liquid distribution valve groups, circulating pumps, electric control cabinets, bases, pipelines, valves and instruments, etc., which can convert the heat obtained from the primary network into heat required by users for life and heating, and is suitable for residential, factory, mine, hospital, hotel, school, shopping mall and other occasions, and has become an important part of urban central heating.

[0003] At present, most of the heat exchange units are provided with only a single heat source, and once the heat source fails, the unit can only be stopped for repair, which will affect the normal heating demand of the users. Although some technologies use double heat sources for heating, the pipeline design is single, and there is no linkage between the heat sources, and the resource utilization rate is low. Therefore, a safe, stable and efficient double heat source heat exchange unit is urgently needed. CONTENT OF THE INVENTION

[0004] Therefore, the purpose of the present application is to provide a double heat source heat exchange unit to solve the problems mentioned in the background art.

[0005] In order to achieve the above purpose, the present application provides a double heat source heat exchange unit, which comprises connected gas-liquid heat exchange pipelines and liquid-liquid heat exchange pipelines; the gas-liquid heat exchange pipeline comprises a gas-liquid heat exchanger, and the gas-liquid heat exchanger comprises a first heat source inlet, a first heat source outlet, a cold source first inlet and a cold source first outlet; the first heat source inlet is used for connecting a gas heat source, and the first heat source outlet is used for connecting a condensate recovery device; the liquid-liquid heat exchange pipeline comprises a liquid-liquid heat exchanger, and the liquid-liquid heat exchanger comprises a second heat source inlet, a second heat source outlet, a cold source second inlet and a cold source second outlet; the second heat source inlet is used for connecting a liquid heat source, and the second heat source outlet is used for connecting a liquid recovery device; the cold source first inlet and the cold source second inlet are communicated and used for connecting a user heating outlet pipeline; the cold source first outlet and the cold source second outlet are communicated and used for connecting a user heating inlet pipeline; the first heat source outlet and the cold source second inlet are communicated through a condensate supplementing two-network branch, and the first heat source outlet and the cold source first inlet are communicated through the condensate supplementing two-network branch.

[0006] Further, the liquid-liquid heat exchange pipeline comprises two parallel liquid-liquid heat exchangers, and the second heat source inlet, the second heat source outlet, the cold source second inlet and the cold source second outlet of one liquid-liquid heat exchanger are respectively communicated with the second heat source inlet, the second heat source outlet, the cold source second inlet and the cold source second outlet of the other liquid-liquid heat exchanger.

[0007] Furthermore, a first regulating valve, a first filter, and a first valve are connected between the first heat source inlet and the gas heat source; a condensate drain valve and a second valve are connected between the first heat source outlet and the condensate recovery device.

[0008] Furthermore, the second valve and the liquid-retaining valve are connected by the condensate replenishment network branch, and the condensate replenishment network branch is provided with a third valve.

[0009] Furthermore, a second regulating valve and a second filter are connected between the second heat source inlet and the liquid heat source; a fourth valve is connected between the second heat source outlet and the liquid recovery device.

[0010] Furthermore, a third filter and a circulation pump are connected between the second inlet of the cold source and the user heating outlet pipeline, and the condensate replenishment network branch is connected between the circulation pump and the third filter.

[0011] Furthermore, a replenishment branch is connected between the circulating pump and the condensate replenishment network branch, and a replenishment pump is provided on the replenishment branch.

[0012] Furthermore, two parallel circulating pumps are connected between the second cold source inlet and the user heating outlet pipeline, and two parallel replenishing pumps are provided on the replenishing branch.

[0013] Furthermore, a first pressure relief branch and a second pressure relief branch are connected between the replenishment branch and the circulation pump. The first pressure relief branch is equipped with a solenoid valve, and the second pressure relief branch is equipped with a safety valve.

[0014] Furthermore, the dual heat source heat exchanger unit is connected to a control cabinet, which is equipped with an outdoor temperature sensor.

[0015] As can be seen from the above, the dual-heat-source heat exchanger unit provided in this application includes connected gas-liquid heat exchange pipelines and liquid-liquid heat exchange pipelines; the gas-liquid heat exchange pipeline includes a gas-liquid heat exchanger, which includes a first heat source inlet, a first heat source outlet, a first cold source inlet, and a first cold source outlet; the first heat source inlet is used to connect to a gaseous heat source, and the first heat source outlet is used to connect to a condensate recovery device; the liquid-liquid heat exchange pipeline includes a liquid-liquid heat exchanger, which includes a second heat source inlet, a second heat source outlet, a second cold source inlet, and a second cold source outlet; the second heat source inlet is used to connect to a liquid heat source, and the second heat source outlet is used to connect to a liquid recovery device; the first cold source inlet and the second cold source inlet are connected. This dual-heat-source heat exchanger unit is used to connect to the user's heating outlet pipeline; the first and second cold source outlets are connected to connect to the user's heating inlet pipeline. By setting up two types of heat source heat exchange pipelines, the two heat sources can be mutually redundant or shared, providing heat for user heating. The heat load can be adjusted as needed, effectively solving the problems of "insufficient heating" and "excessive heating," thereby saving energy, reducing consumption, and improving heating quality. The first heat source outlet is connected to the second cold source inlet via a condensate replenishment branch, and the first heat source outlet is also connected to the first cold source inlet via a condensate replenishment branch. This allows condensate to flow to the cold source inlet when the condensate recovery device overflows, replenishing the heat exchange medium in the second network, thus improving resource utilization and the safety of heat exchange operation. This dual-heat-source heat exchanger unit has a simple structure, is easy to use, effectively improves resource utilization, has good stability, and saves energy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structural connection of a dual-heat-source heat exchanger unit in an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the structural connection of another dual-heat-source heat exchanger unit in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram showing the connection between the first heat source inlet and the first heat source outlet of a gas-liquid heat exchanger.

[0020] Figure 4 This is a schematic diagram showing the connection between the second heat source inlet and the second heat source outlet of a liquid-liquid heat exchanger.

[0021] Figure 5This is a schematic diagram showing the connection between the second inlet and the second outlet of the cold source in a liquid-liquid heat exchanger.

[0022] Figure 6 This is a schematic diagram of the connection of the fluid replenishment branch.

[0023] Reference numerals in the attached diagram: 1. Gas-liquid heat exchanger; 2. Liquid-liquid heat exchanger; 3. Condensate replenishment branch; 3-1. Third valve; 4. First regulating valve; 5. First filter; 6. First valve; 7. Drain valve; 8. Second valve; 9. Second regulating valve; 10. Second filter; 11. Fourth valve; 12. Third filter; 13. Circulation pump; 14. Replenishment branch; 14-1. Replenishment pump; 15. First pressure relief branch; 15-1. Solenoid valve; 16. Second pressure relief branch; 16-1. Safety valve; 17. Control cabinet; 18. Valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0025] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] A heat exchange unit is a complete set of equipment consisting of a heat exchanger, a temperature control valve group, a liquid trap valve group, a circulating pump, an electrical control cabinet, a base, pipelines, valves, instruments, etc. It can convert the heat obtained from the primary network into the heat required for users' domestic life and heating. It is suitable for residences, factories, mines, hospitals, hotels, schools, shopping malls and other occasions, and has become an important part of urban centralized heating.

[0027] Most heat exchange units currently have only a single heat source. If the heat source fails, the unit can only be shut down for repair, which will affect the normal heating needs of users. Although some technologies use dual heat source heating, the pipeline design is simple and there is no linkage between the heat sources, resulting in low resource utilization. Therefore, there is an urgent need for a safe, stable and efficient dual heat source heat exchange unit.

[0028] The following describes specific embodiments in conjunction with the appendix. Figures 1 to 6 The technical solution of this application will be further described in detail.

[0029] Some embodiments of this application provide a dual-heat-source heat exchanger unit, such as Figure 1 and Figure 2 As shown, the system includes connected gas-liquid heat exchange pipelines and liquid-liquid heat exchange pipelines. The gas-liquid heat exchange pipeline includes a gas-liquid heat exchanger 1, which includes a first heat source inlet, a first heat source outlet, a first cold source inlet, and a first cold source outlet. The first heat source inlet is used to connect to a gaseous heat source, and the first heat source outlet is used to connect to a condensate recovery device. The liquid-liquid heat exchange pipeline includes a liquid-liquid heat exchanger 2, which includes a second heat source inlet, a second heat source outlet, a second cold source inlet, and a second cold source outlet. The second heat source inlet is used to connect to a liquid heat source, and the second heat source outlet is used to connect to a liquid recovery device. The first cold source inlet and the second cold source inlet are connected to each other and are used to connect to the user's heating outlet pipeline. The first cold source outlet and the second cold source inlet are connected through a condensate replenishment network branch 3.

[0030] like Figure 1 As shown in the figure, A represents a gas-liquid heat exchange pipeline, and B represents a liquid-liquid heat exchange pipeline. The heat exchange pipeline includes a heat exchanger, such as a plate heat exchanger, a shell-and-tube heat exchanger, or a fully welded plate heat exchanger.

[0031] For the gas-liquid heat exchanger 1, in the figure, a is the first heat source inlet, b is the first heat source outlet, d is the first cold source inlet, and c is the first cold source outlet. The first heat source inlet is used to connect to the gas heat source, the first heat source outlet is used to connect to the condensate recovery device, the first cold source inlet is used to connect to the user's heating outlet pipeline, and the first cold source outlet is used to connect to the user's heating inlet pipeline.

[0032] For the liquid-liquid heat exchanger 2, in the figure, e is the second heat source inlet, f is the second heat source outlet, h is the second cold source inlet, and g is the second cold source outlet. The second heat source inlet is used to connect to the liquid heat source, and the second heat source outlet is used to connect to the liquid recovery device; the second cold source inlet is used to connect to the user's heating outlet pipeline, and the second cold source outlet is used to connect to the user's heating inlet pipeline.

[0033] The first and second cold source inlets are connected, as are the first and second cold source outlets. They can share the same pipeline to provide heat for users. By setting up two types of heat source heat exchange pipelines, the two heat sources can be used as backups for each other or shared. The heat load can be adjusted as needed to meet various operating conditions.

[0034] The outlet of the first heat source is connected to the inlet of the second cold source through a branch line 3 for condensate replenishment in the second network. The outlet of the first heat source is also connected to the inlet of the first cold source through a branch line 3 for condensate replenishment in the second network. In this way, when the condensate recovery device is full, the condensate can flow to the inlet of the cold source as a supplement to the heat exchange medium in the second network, thereby improving resource utilization and the safety of heat exchange operation.

[0035] This dual-heat-source heat exchanger unit uses both steam and liquid heat sources as backups for each other. This solves the problem of having to shut down the unit for repairs when a single heat source fails, and also addresses the issue of "excess heat" caused by low initial occupancy rates. Furthermore, the steam and liquid heat sources can be used simultaneously to address "insufficient heating" caused by increased occupancy rates, preventing difficulties in accurately controlling heating load demand due to fluctuations in occupancy rates.

[0036] This dual-heat-source heat exchanger unit can meet the differentiated heating needs of users in different heating areas, during different heating seasons, and at different times. It is particularly suitable for the heating conditions of mining enterprises, as it can recover and utilize the large amount of excess industrial waste gas generated during production to provide heating and domestic heat to office areas, residential communities, and surrounding commercial areas, thus avoiding energy waste.

[0037] This dual-heat-source heat exchanger unit has a simple structure, is easy to use, can effectively improve resource utilization, has good stability, and saves energy.

[0038] In some embodiments, such as Figure 2 As shown, the liquid-liquid heat exchange pipeline includes two parallel liquid-liquid heat exchangers 2. The second heat source inlet, second heat source outlet, second cold source inlet, and second cold source outlet of one liquid-liquid heat exchanger 2 are respectively connected to the second heat source inlet, second heat source outlet, second cold source inlet, and second cold source outlet of the other liquid-liquid heat exchanger 2.

[0039] like Figure 2As shown, the liquid-liquid heat exchange pipeline includes two parallel liquid-liquid heat exchangers 2. Depending on the heating needs, either one liquid-liquid heat exchanger 2 can be turned on individually, or either one gas-liquid heat exchanger 1 can be turned on individually, or both liquid-liquid heat exchangers 2 can be turned on simultaneously, or both gas-liquid heat exchanger 1 and either one liquid-liquid heat exchanger 2 can be turned on simultaneously, or both liquid-liquid heat exchangers 2 and one gas-liquid heat exchanger 1 can be turned on simultaneously, providing more operating condition options. For example, if this dual heat source heat exchanger unit is used to heat the heating needs of 10 buildings, when 2 buildings are full, one liquid-liquid heat exchanger 2 can be turned on; when 6 buildings are full, two liquid-liquid heat exchangers 2 can be turned on; and when 10 buildings are full, two liquid-liquid heat exchangers 2 and one gas-liquid heat exchanger 1 can be turned on.

[0040] In some embodiments, such as Figure 2 and Figure 3 As shown, a first regulating valve 4, a first filter 5, and a first valve 6 are connected between the first heat source inlet and the gas heat source; a condensate drain valve 7 and a second valve 8 are connected between the first heat source outlet and the condensate recovery device.

[0041] like Figure 3 As shown in the figure, P T For pressure transmitters, T T For temperature transmitters, P I For pressure gauges, T I The first heat source inlet is connected to a pressure gauge, a thermometer, a pressure transmitter, a temperature transmitter, a first regulating valve 4, a first filter 5, and a first valve 6. The main circulating medium in the steam inlet pipeline is steam. According to the heating output temperature requirement, the steam flow rate is controlled by adjusting the opening of the first regulating valve 4 to change the heat load of the gas-liquid heat exchanger 1.

[0042] The first heat source outlet is connected to a pressure gauge, thermometer, pressure transmitter, temperature transmitter, valve 18, condensate trap 7, and second valve 8. As a steam condensation outlet pipeline, it condenses steam to produce a vapor-liquid mixture condensate. The liquid is drained through the condensate trap 7 to isolate the vapor and allow the liquid to pass through. Valves 18 are installed before, after, and in the bypass of the condensate trap 7 for easy replacement and maintenance.

[0043] In some embodiments, such as Figure 2 and Figure 3 As shown, the second valve 8 and the liquid-retaining valve 7 are connected by the condensate replenishment network branch 3, and the condensate replenishment network branch 3 is provided with a third valve 3-1.

[0044] like Figure 2 As shown, a condensate replenishment branch 3 is connected between the second valve 8 and the condensate drain valve 7. A third valve 3-1 is provided on the condensate replenishment branch 3. As needed, the second valve 8 can be closed and the third valve 3-1 can be opened to supply steam condensate into the cold source inlet pipeline.

[0045] In some embodiments, such as Figure 2 and Figure 4 As shown, a second regulating valve 9 and a second filter 10 are connected between the second heat source inlet and the liquid heat source; a fourth valve 11 is connected between the second heat source outlet and the liquid recovery device.

[0046] like Figure 4 As shown, the pipeline of the liquid heat source is connected to a pressure gauge, thermometer, pressure transmitter, temperature transmitter, second regulating valve 9 and second filter 10. It branches into two pipelines that enter the second heat source inlets of the two liquid-liquid heat exchangers 2 respectively. Any one or both second heat source inlets can be opened as needed.

[0047] The pipeline of the liquid recovery device is connected to a pressure gauge, thermometer, pressure transmitter, temperature transmitter and fourth valve 11. Similarly, it branches into two pipelines that are respectively connected to the second heat source outlet of the two liquid-liquid heat exchangers 2.

[0048] In some embodiments, such as Figure 2 and Figure 5 As shown, a third filter 12 and a circulation pump 13 are connected between the second inlet of the cold source and the user heating outlet pipeline, and the condensate replenishment network branch 3 is connected between the circulation pump 13 and the third filter 12.

[0049] like Figure 5 As shown, the user's heating outlet pipeline is connected to a pressure gauge, thermometer, pressure transmitter, temperature transmitter, third filter 12, and circulating pump 13. It branches into three pipelines that enter the second inlet of two cold sources and the first inlet of one cold source, respectively. The user's heating inlet pipeline is connected to a pressure gauge, thermometer, pressure transmitter, and temperature transmitter. It branches into three pipelines that connect the second outlet of two cold sources and the first outlet of one cold source, respectively, realizing the parallel connection of the two types of heat exchangers.

[0050] In some embodiments, such as Figure 2 and Figure 6 As shown, a replenishment branch 14 is connected between the circulation pump 13 and the condensate replenishment network branch 3, and a replenishment pump 14-1 is provided on the replenishment branch 14.

[0051] A replenishment branch 14 connects the circulating pump 13 and the condensate replenishment network branch 3, such as... Figure 6 As shown, the replenishment branch 14 includes a valve 18 and a replenishment pump 14-1. Each replenishment pump 14-1 is equipped with a frequency converter for control. When a large amount of liquid is lost from the secondary network, the valve 18 and the replenishment pump 14-1 can be opened to replenish the heat exchange medium.

[0052] In some embodiments, such asFigure 2 As shown, two parallel circulating pumps 13 are connected between the second inlet of the cold source and the user heating outlet pipeline, and two parallel replenishing pumps 14-1 are provided on the replenishing branch 14.

[0053] like Figure 2 As shown, the pipeline at the cold source inlet is equipped with two parallel circulating pumps 13. Depending on the cold-side flow rate, one circulating pump 13 can be started independently, while the other circulating pump 13 serves as a standby pump. If one circulating pump 13 fails, it can be shut down immediately, and the other circulating pump 13 can be started quickly. When the flow rate exceeds the flow range of a single pump, both circulating pumps 13 can be started simultaneously to ensure the flow rate requirement on the cold side. Similarly, the replenishment branch 14 is equipped with two parallel replenishment pumps 14-1, which serve as backups for each other to ensure the replenishment requirement on the cold side.

[0054] In some embodiments, such as Figure 2 and Figure 5 As shown, a first pressure relief branch 15 and a second pressure relief branch 16 are connected between the replenishment branch 14 and the circulation pump 13. The first pressure relief branch 15 is equipped with a solenoid valve 15-1, and the second pressure relief branch 16 is equipped with a safety valve 16-1.

[0055] like Figure 2 As shown, the pipeline at the cold source inlet is equipped with a first pressure relief branch 15 and a second pressure relief branch 16. The first pressure relief branch 15 is equipped with a solenoid valve 15-1 and a valve 18. When the system is over-pressurized, the solenoid valve 15-1 is opened to release pressure and ensure the system pressure is stable. The second pressure relief branch 16 is equipped with a safety valve 16-1. Similarly, when the system is over-pressurized, the safety valve 16-1 can be opened to release pressure.

[0056] In some embodiments, such as Figure 2 As shown, the dual heat source heat exchanger unit is connected to a control cabinet 17, and the control cabinet 17 is equipped with an outdoor temperature sensor.

[0057] like Figure 2 As shown, the dual heat source heat exchanger unit is also equipped with a control cabinet 17. The control cabinet 17 is electrically connected to the first regulating valve 4, the second regulating valve 9, the circulating pump 13, the replenishing pump 14-1, the solenoid valve 15-1, the pressure transmitter, and the temperature transmitter, etc. The control cabinet 17 is also equipped with an outdoor temperature sensor TE, which can control the heat load of the unit according to the weather temperature, so as to achieve heating by region, season, and time period, as well as automatic adjustment and intelligent control of the unit under different loads.

[0058] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in the details for the sake of brevity.

[0059] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-heat-source heat exchanger unit, characterized in that, This includes connecting gas-liquid heat exchange pipelines and liquid-liquid heat exchange pipelines; The gas-liquid heat exchange pipeline includes a gas-liquid heat exchanger, which includes a first heat source inlet, a first heat source outlet, a first cold source inlet, and a first cold source outlet; the first heat source inlet is used to connect to a gas heat source, and the first heat source outlet is used to connect to a condensate recovery device. The liquid-liquid heat exchange pipeline includes a liquid-liquid heat exchanger, which includes a second heat source inlet, a second heat source outlet, a second cold source inlet, and a second cold source outlet. The second heat source inlet is used to connect to a liquid heat source, and the second heat source outlet is used to connect to a liquid recovery device. The first cold source inlet and the second cold source inlet are connected to connect to the user's heating outlet pipeline. The first cold source outlet and the second cold source outlet are connected to the user's heating inlet pipeline. The first heat source outlet and the second cold source inlet are connected through a condensate replenishment network branch, and the first heat source outlet and the first cold source inlet are connected through the condensate replenishment network branch.

2. The dual-heat-source heat exchanger unit according to claim 1, characterized in that, The liquid-liquid heat exchange pipeline includes two parallel liquid-liquid heat exchangers. The second heat source inlet, second heat source outlet, second cold source inlet, and second cold source outlet of one liquid-liquid heat exchanger are respectively connected to the second heat source inlet, second heat source outlet, second cold source inlet, and second cold source outlet of the other liquid-liquid heat exchanger.

3. The dual-heat-source heat exchanger unit according to claim 1, characterized in that, A first regulating valve, a first filter, and a first valve are connected between the first heat source inlet and the gas heat source; a condensate drain valve and a second valve are connected between the first heat source outlet and the condensate recovery device.

4. The dual-heat-source heat exchanger unit according to claim 3, characterized in that, The second valve and the condensate drain valve are connected by the condensate replenishment network branch, and the condensate replenishment network branch is equipped with a third valve.

5. The dual-heat-source heat exchanger unit according to claim 1, characterized in that, A second regulating valve and a second filter are connected between the second heat source inlet and the liquid heat source; a fourth valve is connected between the second heat source outlet and the liquid recovery device.

6. The dual-heat-source heat exchanger unit according to claim 1, characterized in that, A third filter and a circulation pump are connected between the second inlet of the cold source and the user heating outlet pipeline, and the condensate replenishment network branch is connected between the circulation pump and the third filter.

7. The dual-heat-source heat exchanger unit according to claim 6, characterized in that, A replenishment branch is connected between the circulating pump and the condensate replenishment network branch, and a replenishment pump is installed on the replenishment branch.

8. The dual-heat-source heat exchanger unit according to claim 7, characterized in that, Two parallel circulating pumps are connected between the second inlet of the cold source and the user heating outlet pipeline, and two parallel replenishing pumps are provided on the replenishing branch.

9. The dual-heat-source heat exchanger unit according to claim 7, characterized in that, The replenishment branch and the circulation pump are connected by a first pressure relief branch and a second pressure relief branch. The first pressure relief branch is equipped with a solenoid valve, and the second pressure relief branch is equipped with a safety valve.

10. The dual-heat-source heat exchanger unit according to claim 1, characterized in that, The dual heat source heat exchanger unit is connected to a control cabinet, which is equipped with an outdoor temperature sensor.

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