CN110793186B - Heating system and control method thereof - Google Patents

Heating system and control method thereof Download PDF

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Publication number
CN110793186B
CN110793186B CN201911250413.4A CN201911250413A CN110793186B CN 110793186 B CN110793186 B CN 110793186B CN 201911250413 A CN201911250413 A CN 201911250413A CN 110793186 B CN110793186 B CN 110793186B
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Prior art keywords
liquid
pipe
liquid return
heating system
return
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CN201911250413.4A
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CN110793186A (en
Inventor
张霞
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201911250413.4A priority Critical patent/CN110793186B/en
Publication of CN110793186A publication Critical patent/CN110793186A/en
Priority to PCT/CN2020/111283 priority patent/WO2021114727A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/124—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D15/00—Other domestic- or space-heating systems
    • F24D15/02—Other domestic- or space-heating systems consisting of self-contained heating units, e.g. storage heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/12—Arrangements for connecting heaters to circulation pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters

Abstract

The application relates to a heating system and a control method thereof, wherein the heating system comprises: a combustion device; the main heat exchange device is arranged on one side of the combustion device and can exchange heat with the combustion device; the liquid return pipe is connected with the liquid inlet end of the main heat exchange device; the liquid outlet pipe is connected with the liquid outlet end of the main heat exchange device; and the liquid return pipe and the liquid outlet pipe can exchange heat through the heat exchange structure selectively. According to the heating system, the liquid in the main heat exchange pipe and the liquid in the liquid outlet pipe exchange heat through the heat exchange structure, so that the liquid outlet temperature of the liquid outlet pipe can be reduced while the liquid in the main heat exchange device is maintained at a higher temperature, and the preset temperature requirement is met, so that the flue gas is kept at a higher temperature to avoid condensation of the flue gas on the main heat exchange device.

Description

Heating system and control method thereof
Technical Field
The application relates to the field of heating equipment, in particular to a heating system and a control method thereof.
Background
The gas heating water heater is used as a heating device for providing hot water and heating heat by means of natural gas, is accepted by the vast majority of users, and becomes an important component of heating in cold areas. When the gas heating water heater is in heating operation, when a user needs to quickly raise the room temperature, the water outlet temperature and the system circulation flow of the gas heating water heater need to be improved, and the gas heating water heater is in a large-load state. When the room temperature reaches the required value, the water outlet temperature and the circulation flow of the gas heating water heater need to be reduced, and the gas heating water heater is in a small load state.
However, the inventor found in the research that the non-condensing gas heating water heater on the market has the phenomenon that the minimum load and the maximum load have more than 8% of difference in thermal efficiency, the thermal efficiency of the heating water heater is about 93% when the heating water heater is in the maximum load, and the thermal efficiency of the heating water heater is about 85% when the heating water heater is in the small load, so that the energy waste is caused, the root cause of the lower thermal efficiency of the heating water heater in the small load state is that the discharged flue gas takes away a large amount of heat when the gas heating water heater is in the small load state. In the heating operation process, the gas heating water heater is in a small load state in most of time, so that the energy waste can be effectively reduced by improving the heat efficiency in the small load state.
At present, two schemes are generally adopted to increase the heat efficiency of the gas heating water heater, wherein one scheme is to increase the heat exchange capacity of the main heat exchanger and reduce the temperature of smoke generated by combustion, so that heat dissipation is reduced, and the other scheme is to reduce the excess air coefficient and the smoke quantity.
However, with the first scheme, the temperature of the flue gas is reduced, the combustion power of the burner is small, and the amount and temperature of the flue gas are small when the heating water heater is in a state of small load and low water temperature, so that the temperature of the flue gas easily reaches the dew point temperature (the dew point temperature of the flue gas is the temperature at which water vapor in the high-temperature flue gas begins to condense). By adopting the second scheme, the excess air is reduced, the dew point temperature of the flue gas is increased, and the flue gas temperature can easily reach the dew point temperature when the heating water heater is under a small load. After combustion, part of flue gas is condensed on the main heat exchanger, so that the main heat exchanger is corroded, and the service life of the heating water heater is finally reduced.
Disclosure of Invention
Based on the above, it is necessary to provide a heating system having high heat exchange efficiency in a small load state and a control method thereof, aiming at the problem that the heat exchange efficiency of the heating water heater is low in the small load state.
A heating system, the heating system comprising:
a combustion device;
the main heat exchange device is arranged at one side of the combustion device and can exchange heat with the combustion device;
the liquid return pipe is connected with the liquid inlet end of the main heat exchange device;
the liquid outlet pipe is connected with the liquid outlet end of the main heat exchange device; and
and the liquid return pipe and the liquid outlet pipe can exchange heat through the heat exchange structure selectively.
According to the heating system, the liquid in the main heat exchange pipe and the liquid in the liquid outlet pipe exchange heat through the heat exchange structure, so that the liquid outlet temperature of the liquid outlet pipe can be reduced while the liquid in the main heat exchange device is maintained at a higher temperature, and the preset temperature requirement is met, so that the flue gas is kept at a higher temperature to avoid condensation of the flue gas on the main heat exchange device.
In one embodiment, the liquid return pipe comprises a first liquid return branch pipe and a second liquid return branch pipe which are connected in parallel, and the second liquid return branch pipe can exchange heat with the liquid outlet pipe through the heat exchange structure.
In one embodiment, the liquid return pipe further comprises a first liquid return main pipe and a second liquid return main pipe, the first liquid return branch pipe and the second liquid return branch pipe are connected in parallel between the first liquid return main pipe and the second liquid return main pipe, and the first liquid return main pipe is selectively communicated with the second liquid return main pipe through the first liquid return branch pipe and/or the second liquid return branch pipe.
In one embodiment, the heating structure further includes a flow control unit, the first liquid return main pipe, the first liquid return branch pipe and the second liquid return branch pipe are connected through the flow control unit, and the flow control unit is used for controlling the first liquid return main pipe to be communicated with the first liquid return branch pipe and/or the second liquid return branch pipe.
The control method of the heating system comprises the following steps:
acquiring a load state of a heating system;
and controlling whether the liquid in the liquid return pipe exchanges heat with the liquid in the liquid outlet pipe through the heat exchange structure according to the load state of the heating system.
In one embodiment, when the heating system is in a low-temperature small-load state, the liquid in the liquid return pipe is controlled to exchange heat with the liquid in the liquid outlet pipe through the heat exchange structure.
In one embodiment, the liquid return pipe comprises a first liquid return branch pipe and a second liquid return branch pipe which are connected in parallel, and the second liquid return branch pipe can exchange heat with the liquid outlet pipe through the heat exchange structure; when the heating system is in a low-temperature small-load state, the step of controlling the liquid in the liquid return pipe to exchange heat with the liquid in the liquid outlet pipe through the heat exchange structure specifically comprises the following steps of:
and when the heating system is in the low-temperature small-load state, controlling liquid to flow through the second liquid return branch pipe.
In one embodiment, the liquid return pipe further comprises a first liquid return main pipe and a second liquid return main pipe, and the first liquid return branch pipe and the second liquid return branch pipe are connected in parallel between the first liquid return main pipe and the second liquid return main pipe; when the heating system is in the low-temperature small-load state, the step of controlling the liquid to flow through the second liquid return branch pipe specifically comprises the following steps of:
when the heating system is in the low-temperature small-load state, the first liquid return main pipe is controlled to be communicated with the second liquid return main pipe through the second liquid return branch pipe.
In one embodiment, when the heating system is in a non-low temperature small load state, the liquid in the liquid return pipe is controlled not to pass through the heat exchange structure.
In one embodiment, the liquid return pipe comprises a first liquid return branch pipe and a second liquid return branch pipe which are connected in parallel, and the second liquid return branch pipe can exchange heat with the liquid outlet pipe through the heat exchange structure; when the heating system is in a non-low temperature small load state, the step of controlling the liquid in the liquid return pipe not to pass through the heat exchange structure specifically comprises the following steps of:
and when the heating system is in the non-low-temperature small-load state, controlling the liquid to flow through the first liquid return branch pipe.
In one embodiment, the liquid return pipe further comprises a first liquid return main pipe and a second liquid return main pipe, and the first liquid return branch pipe and the second liquid return branch pipe are connected in parallel between the first liquid return main pipe and the second liquid return main pipe; the step of controlling the liquid to flow through the first liquid return branch pipe when the heating system is in the non-low temperature light load state includes the steps of:
when the heating system is in the low-temperature small-load state, the first liquid return main pipe is controlled to be communicated with the second liquid return main pipe through the first liquid return branch pipe.
Drawings
FIG. 1 is a schematic diagram of a heating system according to an embodiment of the application;
FIG. 2 is a schematic diagram of a heating system of FIG. 1 in a low temperature light load state;
FIG. 3 is a schematic diagram of the heating system of FIG. 1 in a non-low temperature light load state;
fig. 4 is a flowchart of a control method of a heating system according to an embodiment of the application.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" 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," "left," "right," and the like are used herein for illustrative purposes only.
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 application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a heating system 100 according to an embodiment of the present application is used to heat various rooms in a room. The structure of the heating system 100 according to the present application will be described below by taking the heating system 100 as a gas heating furnace system as an example. The present embodiment is only used as an example and does not limit the technical scope of the present application. It will be appreciated that in other embodiments, the heating system 100 may also be embodied as a gas water heater system or the like, and is not limited herein.
Specifically, the heating system 100 includes a control device (not shown), a combustion device 10, a main heat exchanging device 20, a liquid outlet pipe 40, a heating pipe, and a liquid return pipe 30. The main heat exchanging device 20, the liquid outlet pipe 40, the heating pipe and the liquid return pipe 30 are connected to form a heating pipeline, the main heat exchanging device 20 is disposed on one side of the combustion device 10, and the main heat exchanging device 20 can exchange heat with the combustion device 10 to obtain heat of high-temperature flue gas generated by combustion of the combustion device 10.
Thus, under the control of the control device, the natural gas burns in the combustion device 10, the high-temperature flue gas generated by the combustion can exchange heat with the liquid in the main heat exchange device 20, the liquid after heat exchange flows out of the main heat exchange device 20 through the liquid outlet pipe 40, flows into each room through the heating pipe to exchange heat with the air in the room, so as to heat each room, and finally the liquid after heat exchange returns to the main heat exchange device 20 through the liquid return pipe 30.
With continued reference to fig. 1, the return line 30 includes a first return main line 32, a second return main line 34, a first return branch line 36, and a second return branch line 38. The first liquid return branch pipe 36 and the second liquid return branch pipe 38 are connected in parallel between the first liquid return main pipe 32 and the second liquid return main pipe 34, an inlet end of the first liquid return main pipe 32 is connected to an outlet end of the heating pipe, an outlet end of the first liquid return main pipe 32 is simultaneously connected to an inlet end of the first liquid return branch pipe 36 and an inlet end of the second liquid return branch pipe 38, an outlet end of the first liquid return branch pipe 36 and an outlet end of the second liquid return branch pipe 38 are both connected to an inlet end of the second liquid return main pipe 34, and an outlet end of the second liquid return main pipe 34 is connected to an inlet end of the main heat exchange device 20. The inlet end of the liquid outlet pipe 40 is connected to the liquid outlet end of the main heat exchange device 20, and the outlet end of the liquid outlet pipe 40 is connected to the inlet end of the heating pipe.
In this way, the liquid absorbing the heat of the flue gas in the main heat exchange device 20 enters the heating pipe through the liquid outlet pipe 40, and after the liquid in the heating pipe completes heat exchange in the room, the liquid returns to the main heat exchange device 20 again through the first liquid return main pipe 32, the first liquid return branch pipe 36 and/or the second liquid return branch pipe 38, and the second liquid return main pipe 34 in sequence.
Further, the heating system 100 further includes a flow control unit 60 communicatively coupled to the control device. The first liquid return main pipe 32, the first liquid return branch pipe 36 and the second liquid return branch pipe 38 are connected through a flow control unit 60, and the flow control unit 60 is used for controlling the first liquid return main pipe 32 to be communicated with the first liquid return branch pipe 36 and/or the second liquid return branch pipe 38, so that liquid in the first liquid return main pipe 32 can flow into the second liquid return main pipe 34 through the first liquid return branch pipe and/or the second liquid return branch pipe 38 selectively.
Specifically, the flow control unit 60 is an electric three-way valve, and includes a first valve port, a second valve port, and a third valve port that can be opened or closed under the control of the control device. Wherein, the first valve port is connected to the outlet end of the first liquid return main pipe 32, the second valve port is connected to the inlet end of the first liquid return branch pipe 36, and the third valve port is connected to the inlet end of the second liquid return branch pipe 38. Thus, the control device can control the opening of the valve port of the flow control unit 60 to change the flow path of the liquid.
Further, the heating system 100 further includes a heat exchange structure 50, and the second liquid return branch 38 can exchange heat with the liquid outlet pipe 40 through the heat exchange structure 50.
Specifically, since the temperature of the liquid flowing from the main heat exchange device 20 into the liquid return pipe 30 is higher than the temperature of the liquid flowing from the main heat exchange device 20 into the liquid outlet pipe 40 because the liquid in the main heat exchange device 20 is heated by absorbing the heat of the flue gas in the main heat exchange device 20 after entering the main heat exchange device 20. When the heating system 100 is in the low-temperature small-load state, the outlet end of the liquid outlet pipe 40 is required to have a lower liquid outlet temperature, so that the heat exchange structure 50 can be used to exchange heat between the liquid in the liquid return pipe and the liquid in the liquid outlet pipe 40, and the heat of the liquid in the liquid outlet pipe 40 is transferred to the liquid return pipe 30 to cool down to reach the preset liquid outlet temperature, so that the liquid temperature in the main heat exchange device 20 does not need to be directly reduced. Because the temperature of the flue gas is positively correlated with the temperature of the liquid in the main heat exchange device 20, the liquid in the main heat exchange device 20 is maintained at a higher temperature to maintain the flue gas at a higher temperature, so that the heat exchange rate of the heating system in a low-temperature small-load state can be improved by reducing the discharge amount of the flue gas, and the flue gas is prevented from condensing on the main heat exchange device 20 to reduce the service life of the main heat exchange device 20. Conversely, if the temperature of the liquid in the main heat exchange device 20 is reduced to achieve the purpose of reducing the temperature of the liquid discharged from the main liquid outlet pipe 40, the temperature of the flue gas exchanging heat with the liquid in the main heat exchange device 20 is low, and if the discharge amount of the flue gas is reduced to try to increase the heat exchange rate of the heating system 100, the temperature of the flue gas is easily lower than the dew point temperature to be condensed, so that the main heat exchange device 20 is corroded, and the service life of the main heat exchange device 20 is affected.
The control method of the heating system 100 includes the following steps:
s110: the load state of the heating system 100 is acquired.
Specifically, the heating system 100 has two load states of a low temperature small load state and a non-low temperature small load state, and the non-low temperature small load state includes any other load state such as a large load state other than the low temperature small load state. In particular, in some embodiments, when the heating system 100 is in a low temperature and low load state, the outlet temperature of the outlet pipe 40 is 20 ℃ to 45 ℃, and the load of the heating system 100 is less than 30% of full load.
S120: whether the liquid in the liquid return pipe 30 exchanges heat with the liquid in the liquid outlet pipe 40 through the heat exchange structure 50 is controlled according to the load state of the heating system 100.
Specifically, the control device controls the operation state of the flow rate adjusting unit according to the load state of the heating system 100, thereby controlling the flow path of the liquid in the liquid return pipe 30, and finally controlling the liquid outlet temperature of the liquid outlet pipe 40.
When the heating system 100 is in a low-temperature small-load state, the control device controls the first valve and the third valve of the flow regulating unit to be in an open state, and the second valve to be in a closed state, so that the first liquid return main pipe 32 is communicated with the second liquid return main pipe 34 only through the second liquid return branch pipe 38, and the liquid in the second liquid return branch pipe 38 exchanges heat with the liquid in the liquid outlet pipe 40 through the heat exchange structure 50. Since the temperature of the liquid in the second liquid return branch pipe 38 is lower than the temperature of the liquid in the liquid outlet pipe 40, the heat of the liquid in the liquid outlet pipe 40 is transferred to the second liquid return branch pipe 38, so that the temperature of the liquid flowing out from the outlet end of the liquid outlet pipe 40 is lower than the temperature in the main heat exchange device 20 to meet the preset liquid outlet temperature requirement. In this way, the temperature of the liquid in the main heat exchanging device 20 is higher, resulting in higher temperature of the flue gas exchanging with it, so that while the flue gas discharge amount is reduced to increase the thermal efficiency of the heating system 100, the flue gas temperature is not easily lower than the dew point temperature, and thus is not condensed on the main heat exchanging device 20.
When the heating system 100 is in a non-low temperature small load state, the control device controls the first valve and the second valve of the flow adjustment to be in an open state, and the third valve is in a closed state, and the first liquid return main pipe 32 is communicated with the second liquid return main pipe 34 only through the second liquid return branch pipe 38. In this way, the liquid in the liquid return pipe 30 does not pass through the heat exchange structure 50, and the liquid in the liquid outlet pipe 40 does not exchange heat in the heat exchange structure 50, so the liquid outlet temperature of the liquid outlet pipe 40 is the same as the liquid temperature in the main heat exchange device 20. In contrast, if the liquid in the liquid outlet pipe 40 still exchanges heat with the liquid in the second liquid return branch pipe 38 when the heating system 100 is in a non-low temperature and small load state, the temperature of the liquid in the main heat exchanging device 20 will be higher and easily gasified when the liquid outlet temperature of the liquid outlet pipe 40 reaches a preset higher liquid outlet temperature. In some embodiments, the third valve may also be in a partially open state.
According to the heating system 100 and the control method thereof, the liquid outlet pipe 40 and the liquid return pipe 30 can exchange heat through the heat exchange structure 50, so that according to different load states, the liquid outlet temperature of the liquid outlet pipe 40 and the liquid temperature difference in the main heat exchange device 20 can be regulated by using the liquid in the liquid return pipe 30, so that the heating system 100 can improve the heat exchange efficiency in a small load state by 12% -14% and the heat exchange efficiency in a large load state by 3% -5% while reducing the discharge amount of the flue gas, ensure the higher temperature of the flue gas, and avoid the condensation of the flue gas caused by the reduction of the discharge amount of the flue gas, thereby achieving the purposes of energy conservation and emission reduction and prolonging the service life of the heating system 100. In addition, because the condensation problem of the heating system 100 in the low-load low-water temperature state is overcome, the adjusting range of the combustion power of the combustion device 10 can be enlarged, the starting times of the heating system 100 are reduced, the applicability of the heating system 100 is enlarged, different requirements of users on heating are met, and the user experience is greatly improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (9)

1. A heating system, the heating system comprising:
a combustion device (10);
the main heat exchange device (20) is arranged on one side of the combustion device (10), and the main heat exchange device (20) can exchange heat with the combustion device (10);
a liquid return pipe (30) connected to the liquid inlet end of the main heat exchange device (20);
the liquid outlet pipe (40) is connected with the liquid outlet end of the main heat exchange device (20); and
-a heat exchange structure (50), through which heat exchange structure (50) the return liquid pipe (30) and the outlet liquid pipe (40) exchange heat selectively;
when the heating system is in a low-temperature small-load state, controlling the liquid in the liquid return pipe (30) to exchange heat with the liquid in the liquid outlet pipe (40) through the heat exchange structure (50);
when the heating system is in a non-low temperature small load state, controlling the liquid in the liquid return pipe (30) not to pass through the heat exchange structure (50).
2. The heating system according to claim 1, wherein the return line (30) comprises a first return line (36) and a second return line (38) connected in parallel, the second return line (38) being arranged to exchange heat with the outlet line (40) via the heat exchange structure (50).
3. The heating system according to claim 2, wherein the return line (30) further comprises a first return line (32) and a second return line (34), the first return branch line (36) and the second return branch line (38) being connected in parallel between the first return line (32) and the second return line (34), the first return line (32) being optionally connected to the second return line (34) via the first return branch line (36) and/or the second return branch line (38).
4. A heating system according to claim 3, characterized in that the heating system further comprises a flow control unit (60), the first main liquid return pipe (32), the first branch liquid return pipe (36) and the second branch liquid return pipe (38) being connected by the flow control unit (60), the flow control unit (60) being adapted to control the first main liquid return pipe (32) to communicate with the first branch liquid return pipe (36) and/or the second branch liquid return pipe (38).
5. A control method of a heating system as claimed in any one of claims 1 to 4, comprising the steps of:
acquiring a load state of a heating system;
controlling whether the liquid in the liquid return pipe (30) exchanges heat with the liquid in the liquid outlet pipe (40) through the heat exchange structure (50) according to the load state of the heating system;
when the heating system is in a low-temperature small-load state, controlling the liquid in the liquid return pipe (30) to exchange heat with the liquid in the liquid outlet pipe (40) through the heat exchange structure (50);
when the heating system is in a non-low temperature small load state, controlling the liquid in the liquid return pipe (30) not to pass through the heat exchange structure (50).
6. The control method of a heating system according to claim 5, wherein the liquid return pipe (30) comprises a first liquid return branch pipe (36) and a second liquid return branch pipe (38) connected in parallel, the second liquid return branch pipe (38) being capable of exchanging heat with the liquid outlet pipe (40) through the heat exchanging structure (50); when the heating system is in a low-temperature small-load state, the step of controlling the liquid in the liquid return pipe (30) to exchange heat with the liquid in the liquid outlet pipe (40) through the heat exchange structure (50) specifically comprises the following steps:
when the heating system is in the low temperature light load state, liquid is controlled to flow through the second liquid return branch pipe (38).
7. The control method of a heating system according to claim 6, wherein the liquid return pipe (30) further includes a first liquid return main pipe (32) and a second liquid return main pipe (34), the first liquid return branch pipe (36) and the second liquid return branch pipe (38) being connected in parallel between the first liquid return main pipe (32) and the second liquid return main pipe (34); the step of controlling the flow of liquid through the second liquid return branch pipe (38) when the heating system is in the low temperature light load state specifically includes the steps of:
when the heating system is in the low-temperature small-load state, the first liquid return main pipe (32) is controlled to be communicated with the second liquid return main pipe (34) through the second liquid return branch pipe (38).
8. The control method of a heating system according to claim 5, wherein the liquid return pipe (30) comprises a first liquid return branch pipe (36) and a second liquid return branch pipe (38) connected in parallel, the second liquid return branch pipe (38) being capable of exchanging heat with the liquid outlet pipe (40) through the heat exchanging structure (50); when the heating system is in a non-low temperature small load state, the step of controlling the liquid in the liquid return pipe (30) not to pass through the heat exchange structure (50) specifically comprises the following steps:
controlling the flow of the liquid through the first liquid return branch (36) when the heating system is in the non-low temperature light load state.
9. The control method of a heating system according to claim 8, wherein the liquid return pipe (30) further includes a first liquid return main pipe (32) and a second liquid return main pipe (34), the first liquid return branch pipe (36) and the second liquid return branch pipe (38) being connected in parallel between the first liquid return main pipe (32) and the second liquid return main pipe (34); the step of controlling the flow of the liquid through the first liquid return branch pipe (36) when the heating system is in the non-low temperature light load state comprises the steps of:
when the heating system is in the low-temperature small-load state, the first liquid return main pipe (32) is controlled to be communicated with the second liquid return main pipe (34) through the first liquid return branch pipe (36).
CN201911250413.4A 2019-12-09 2019-12-09 Heating system and control method thereof Active CN110793186B (en)

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Application Number Priority Date Filing Date Title
CN201911250413.4A CN110793186B (en) 2019-12-09 2019-12-09 Heating system and control method thereof
PCT/CN2020/111283 WO2021114727A1 (en) 2019-12-09 2020-08-26 Heating system and control method therefor

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Application Number Priority Date Filing Date Title
CN201911250413.4A CN110793186B (en) 2019-12-09 2019-12-09 Heating system and control method thereof

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Publication Number Publication Date
CN110793186A CN110793186A (en) 2020-02-14
CN110793186B true CN110793186B (en) 2023-11-28

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