A heat pump heating system and a control method of a heat pump heating system

Abstract

The application provides a heat pump heating system and a control method of the heat pump heating system, and the heat pump heating system comprises a heat source device, a heat storage device and at least one user terminal equipment; the heat storage device is arranged on an output circuit connected between the heat source device and the at least one user terminal equipment, and is used for delivering stored heat energy to the at least one user terminal equipment; wherein if the heat supply amount of the heat source device for the at least one user terminal equipment is less than a preset required heat amount in a starting stage, the heat storage device is controlled to deliver heat energy to the at least one user terminal equipment. The application solves the technical problem that the existing heat pump heating system needs to start heating and temperature rising of refrigerant and the whole heating system from low temperature condition when starting heating, and once cold weather is encountered, the waiting time of a customer from starting to using to heat supply service is generally relatively long, so that the experience of the customer is reduced.

Description

Technical Field

[0001] This invention relates to the field of heat pump heating technology, and more specifically, to a heat pump heating system and a control method for the heat pump heating system. Background Technology

[0002] With technological advancements and improved living standards, heat pump systems are becoming increasingly common in households. However, the technology suffers from at least one of the following problems: existing heat pump heating systems require the refrigerant and the entire system to be reheated from a low temperature before starting to heat up. In cold weather, the waiting time from powering on to receiving heating service is generally quite long, thus reducing the customer experience. Summary of the Invention

[0003] The technical problem solved by this invention is that existing heat pump heating systems require the refrigerant and the entire heating system to be reheated from a low temperature when they start heating. In cold weather, the waiting time from powering on to receiving heating service is generally long, which reduces the customer's experience.

[0004] To address the aforementioned problems, the present invention provides a heat pump heating system, comprising: a heat source device, a heat storage device, and at least one user terminal device; the heat storage device is disposed on the output circuit connecting the heat source device and the at least one user terminal device, and is used to deliver stored heat energy to the at least one user terminal device; wherein, if the heat supplied by the heat source device to the at least one user terminal device during the start-up phase is less than the preset heat demand, the heat storage device is controlled to deliver heat energy to the at least one user terminal device.

[0005] Compared with existing technologies, the technical effects achieved by this solution are as follows: Considering the actual environment of a heat pump heating system, during the process of controlling the operation of the heat pump heating system, the refrigerant and the entire system need to be heated from a low temperature. This heating process takes a certain amount of time, during which users cannot feel the warm air in time. In other words, the temperature delivered to the user by the heat pump heating system during this period cannot reach the user's set comfort temperature, resulting in cold air blowing in and thus reducing the user experience. Specifically, compared with traditional heat pump heating systems, this solution adds a heat storage device to store part of the heat energy output by the heat source device, achieving a pre-heat storage effect. This allows the heat energy to be delivered to the user's terminal equipment through the heat storage device when the heat pump heating system is turned on again, thus avoiding the situation where the heating efficiency of the heat source device is low during the start-up phase, which leads to a reduction in the user experience.

[0006] In one embodiment of the present invention, the output circuit includes an output circuit one and an output circuit two; the heat storage device is disposed in the output circuit one, and the output circuit one is provided with a first control valve at a position corresponding to the heat storage device and the heat source device, the first control valve being used to control the connection or closure between the heat source device and the heat storage device; the output circuit two is connected between the heat source device and at least one user terminal device, and the output circuit two is provided with a second control valve.

[0007] Compared with existing technologies, the technical effects achieved by this solution are as follows: Based on the actual heat storage capacity of the thermal storage device, when the actual heat storage capacity approaches or equals the rated heat storage capacity, the first control valve can be controlled to close the connection between the heat source device and the thermal storage device, thus interrupting the heat source device's charging of the thermal storage device. At this time, the heating of the user terminal equipment can still be achieved simultaneously by the heat source device and the thermal storage device, i.e., controlling the second control valve to keep output circuit two in a connected state. Of course, while keeping output circuit two connected, output circuit one can also remain connected. Correspondingly, the thermal storage device can continuously receive heat from the heat source device, and simultaneously supply heat to the user terminal equipment. At this time, the user terminal equipment simultaneously receives heat from both the heat source device and the thermal storage device. Alternatively, considering the actual operating stages of the heat pump heating system, for example, during the startup phase, only the heat storage device can provide heat to the user terminal equipment. For instance, the second control valve can be closed to prevent the user terminal equipment from receiving low-temperature cold medium, thus avoiding the occurrence of cold air blowing in. When the heating efficiency of the heat source device increases to meet the user's heating needs, the heat storage device becomes the heat source device to provide heat to the user terminal equipment. It is understandable that when the heat pump heating system is in a power-off state, the heat stored in the heat storage device will decrease over time. Therefore, by flexibly controlling the opening or closing of the first and second control valves, the stability of the heating supply can be ensured regardless of the stage of the heat pump heating system, improving the user experience. It also ensures that the heat stored in the heat storage device is always at its maximum value when the heat pump heating system is powered on, thereby extending the heat storage time for the next heating moment.

[0008] In one embodiment of the present invention, the output circuit is further provided with a third control valve, which is located between the output port of the heat storage device and the input port of the corresponding user terminal device, and is used to regulate the thermal energy input to the user terminal device; the heat source device and at least one user terminal device are also connected by an input circuit, which is used to return the cold medium from the corresponding user terminal device to the heat source device.

[0009] In one embodiment of the present invention, at least one user terminal device includes at least one of an air conditioning device, a radiator device, and a floor heating device; and / or, the input circuit is further provided with a fourth control valve for adjusting the heat exchange parameters of the cold medium returned by the corresponding user terminal device to the heat source device; wherein, the heat exchange parameters include the cold medium flow rate and the cold medium flow rate.

[0010] Compared with existing technologies, the technical effects achieved by this solution are as follows: by flexibly adjusting the opening angles of the third and fourth control valves, the flow rate and velocity of the cold medium input to the user terminal equipment can be changed, so that the heat pump heating system can more accurately meet the user's heating output efficiency and save energy.

[0011] On the other hand, the present invention also provides a control method for a heat pump heating system, which is applied to a heat pump heating system as described in any of the above examples. The control method includes: after the heat pump heating system is turned on, obtaining the heating temperature of the cold medium in the heat source device; determining whether the heating temperature meets the heating conditions; if not, the heat storage device performs a heating action on at least one user terminal device.

[0012] Compared with existing technologies, the technical effect achieved by adopting this technical solution is that it can deliver heat energy to user terminal equipment through the heat storage device, so as to avoid the situation where the heat source device has low heating efficiency during the start-up phase of the heat pump heating system, which would reduce the user experience.

[0013] In one embodiment of the present invention, determining whether the heating temperature meets the heating conditions includes: if so, controlling the heat source device to perform a heating action on at least one user terminal device.

[0014] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: By combining the actual heating situation of the heat pump heating system, the heat storage device and the heat source device can adapt to and cooperate with the different operating stages of the heat pump heating system, so as to achieve uninterrupted and stable heating for the indoor environment where the user terminal equipment is located, thereby improving the overall heating efficiency of the system and improving the user experience.

[0015] In one embodiment of the present invention, controlling the heat source device to perform a heating action on at least one user terminal device includes: determining whether the heat storage in the heat storage device meets the pre-storage conditions; if yes, controlling the heat source device to charge the heat storage device and simultaneously performing a heating action on at least one user terminal device; and / or if no, controlling only the heat source device to perform a heating action on at least one user terminal device.

[0016] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by combining the actual heat storage capacity of the heat storage device, it ensures that the heat storage capacity is always maintained at a stable rated heat storage capacity, thus guaranteeing stable heating efficiency for users when the heat pump heating system is turned on at the next moment.

[0017] In one embodiment of the present invention, the heating action performed by the thermal storage device on at least one user terminal device includes: if there are multiple user terminal devices, adjusting the heating ratio of each user terminal device according to the demand priority and operating mode of the multiple user terminal devices.

[0018] Compared with existing technologies, the technical effect achieved by adopting this technical solution is to make the actual heating efficiency of the heat pump heating system match the actual needs of users.

[0019] In one embodiment of the present invention, adjusting the heating ratio of each of the multiple user terminal devices according to their demand priority and operating mode includes: when T1-T2 < ΔT1 and T3-T2 < ΔT2, controlling the reduction of the heat supply from the heat storage device to the user terminal devices; when T1-T2 > ΔT3 and T3-T2 > ΔT4, controlling the increase of the heat supply from the heat storage device to the user terminal devices; wherein, T1 is the user-set temperature, T2 is the indoor ambient temperature, T3 is the refrigerant temperature; ΔT1 is the first preset temperature difference value, ΔT2 is the second preset temperature difference value, ΔT3 is the third preset temperature difference value, and ΔT4 is the fourth preset temperature difference value.

[0020] Compared with existing technologies, the technical effect achieved by adopting this technical solution is to further improve the actual heating efficiency of the heat pump heating system so as to better meet the actual needs of users.

[0021] In one embodiment of the present invention, when it is determined that the heat storage in the heat storage device meets the pre-storage conditions, the heat source device is controlled to charge the heat storage device in a second natural time period prior to the first natural time period; wherein, the first electricity price corresponding to the first natural time period is higher than the second electricity price corresponding to the second natural time period.

[0022] Compared with existing technologies, the technical effects achieved by this solution are as follows: For example, the electricity price of the power grid system varies depending on the natural time of day. Taking peak-valley electricity as an example, the period from 8:00 AM to 10:00 PM is considered off-peak electricity, during which the heating components in the thermal storage device can operate, thereby storing electrical energy as heat energy, which corresponds to the second natural time period. During the remaining natural time periods, i.e., the first natural time period mentioned in this technical solution, the electricity price is higher than that during the second natural time period. Therefore, controlling the heat source device to charge the thermal storage device during the second natural time period, which takes precedence over the first natural time period, can save on electricity costs and reduce the user's operating costs.

[0023] By adopting the technical solution of the present invention, the following technical effects can be achieved: (1) In combination with the actual environment of the heat pump heating system, since the process of controlling the start-up of the heat pump heating system requires heating the cold medium and the whole system from a low temperature, and this heating process takes a certain amount of time, the user cannot feel the warm air in time during this period. That is, the temperature delivered to the user by the heat pump heating system during this period cannot reach the user's set comfortable temperature, resulting in cold air blowing in, which reduces the user's experience. Specifically, compared with the traditional heat pump heating system, this technical solution adds a heat storage device to store part of the heat energy output by the heat source device, so as to achieve the pre-heat storage effect. This allows the heat energy to be delivered to the user's terminal equipment through the heat storage device when the heat pump heating system is turned on again, so as to avoid the low heating efficiency of the heat source device during the start-up phase, which would reduce the user's experience. (2) For example, the electricity price of the power grid system varies depending on the natural time. Taking peak-valley electricity as an example, the period from 8:00 am to 10:00 pm is valley electricity, which allows the heating components in the thermal storage device to operate and store electrical energy as thermal energy, which corresponds to the second natural time period. In the other natural time periods, which is the first natural time period mentioned in this technical solution, the electricity price is higher than that in the second natural time period. Therefore, controlling the heat source device to charge the thermal storage device in the second natural time period, which takes precedence over the first natural time period, can save electricity costs and reduce the user's operating costs. Attached Figure Description

[0024] Figure 1 A simplified structural connection diagram of a heat pump heating system provided in an embodiment of the present invention.

[0025] Figure 2This is a flowchart illustrating a control method for a heat pump heating system provided in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures: 100. Heat pump heating system; 101. Output circuit two; 102. Output circuit one; 10. Heat source device; 20. Heat storage device; 30. User terminal equipment. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] See Figure 1 This is a simplified structural connection diagram of a heat pump heating system 100 provided in an embodiment of the present invention. Specifically, the heat pump heating system 100 includes, for example, a heat source device 10, a heat storage device 20, and at least one user terminal device 30. The heat storage device 20 is disposed on the output circuit connecting the heat source device 10 and the at least one user terminal device 30, and is used to deliver stored heat energy to the at least one user terminal device 30; wherein, if the heat supply from the heat source device 10 to the at least one user terminal device 30 during the start-up phase is less than the preset heat demand, the heat storage device 20 is controlled to deliver heat energy to the at least one user terminal device 30.

[0029] Considering the actual environment of the heat pump heating system 100, during the process of controlling the start-up of the heat pump heating system 100 to operate the heating function, it is necessary to heat the cold medium and the entire system from a low temperature. This heating process takes a certain amount of time, during which time the user cannot feel the warm air in time. That is, the temperature delivered to the user by the heat pump heating system 100 during this period cannot reach the user's set comfortable temperature, resulting in cold air blowing in, thus reducing the user's experience. Specifically, compared with the traditional heat pump heating system 100, this technical solution adds a heat storage device 20, which stores part of the heat energy output by the heat source device 10, achieving a pre-heat storage effect. This allows the heat energy to be delivered to the user terminal device 30 through the heat storage device 20 when the heat pump heating system 100 is turned on again, so as to avoid the situation where the heating efficiency of the heat source device 10 is low during the start-up phase, which would reduce the user's experience.

[0030] Furthermore, considering the actual heat storage capacity of the heat storage device 20, when the actual heat storage capacity approaches or equals the rated heat storage capacity, the first control valve can be controlled to close the connection between the heat source device 10 and the heat storage device 20, that is, to interrupt the charging of the heat source device 10 to the heat storage device 20. At this time, the heating of the user terminal equipment 30 can still be achieved simultaneously by the heat source device 10 and the heat storage device 20, that is, the second control valve is controlled to keep the output circuit 101 connected. Of course, while keeping the output circuit 101 connected, the output circuit 102 can also be kept connected. Correspondingly, the heat storage device 20 can continuously receive the heat from the heat source device 10, and at the same time, it also supplies heat to the user terminal equipment 30. At this time, the user terminal equipment 30 simultaneously receives the heat from the heat source device 10 and the heat storage device 20.

[0031] Alternatively, considering the actual operating phases of the heat pump heating system 100, for example, during the startup phase, only the heat storage device 20 can provide heat to the user terminal device 30. For instance, the second control valve can be closed to shut off the output circuit 101 to prevent the user terminal device 30 from receiving low-temperature cold medium and causing cold air to blow in. When the heating efficiency of the heat source device 10 increases to meet the user's heating needs, the heat storage device 20 will switch to providing heat to the user terminal device 30. It is understandable that when the heat pump heating system 100 is in a power-off state, the heat storage in the heat storage device 20 will decrease over time. Therefore, by flexibly controlling the opening or closing of the first and second control valves, the stability of the heating supply can be ensured regardless of the stage of the heat pump heating system 100, improving the user experience. Furthermore, when the heat pump heating system 100 is powered on, the heat storage in the heat storage device 20 can always maintain its maximum value to extend the heat storage time for the next heating moment.

[0032] Preferably, the output circuit includes output circuit one 102 and output circuit two 101; the heat storage device 20 is disposed in output circuit one 102, and output circuit one 102 is provided with a first control valve at the position corresponding to the heat storage device 20 and the heat source device 10, the first control valve being used to control the connection or closure between the heat source device 10 and the heat storage device 20; output circuit two 101 is connected between the heat source device 10 and at least one user terminal device 30, and output circuit two 101 is provided with a second control valve.

[0033] Preferably, the output circuit is further provided with a third control valve, which is located between the output port of the heat storage device 20 and the input port of the corresponding user terminal device 30, and is used to realize or stop the heat storage device 20 from delivering heat energy to the user terminal device; the heat source device 10 is also connected to at least one user terminal device 30 by an input circuit, which is used to return the cold medium from the corresponding user terminal device 30 to the heat source device 10.

[0034] Preferably, at least one user terminal device 30 includes at least one of an air conditioning device, a radiator device, and a floor heating device; and / or, the input circuit is further provided with a fourth control valve for adjusting the heat exchange parameters of the cold medium returned by the corresponding user terminal device 30 to the heat source device 10; wherein, the heat exchange parameters include the cold medium flow rate and the cold medium flow rate.

[0035] On the other hand, see Figure 2 This is a flowchart illustrating a control method for a heat pump heating system 100 provided in an embodiment of the present invention. This control method is applied to the heat pump heating system 100 as described in any of the above technical solutions; specifically, the control method includes: Step S1: After the heat pump heating system 100 is turned on, obtain the heating temperature of the cold medium in the heat source device 10. Step S2: Determine whether the heating temperature meets the heating conditions; Step S3: If not, the heat storage device 20 performs a heating operation on at least one user terminal device 30.

[0036] Preferably, determining whether the heating temperature meets the heating conditions includes: If so, the heat source device 10 controls the heat supply device 10 to perform a heating action on at least one user terminal device 30.

[0037] Preferably, the heat source control device 10 performs a heating operation on at least one user terminal device 30, including: Determine whether the heat storage capacity in the heat storage device 20 meets the pre-storage conditions; If so, the heat source device 10 is controlled to charge the heat storage device 20, and simultaneously performs a heating operation on at least one user terminal device 30; and / or If not, then the control is performed by the heat source device 10 to perform the heating action on at least one user terminal device 30.

[0038] Preferably, the heat storage device 20 performs a heating operation on at least one user terminal device 30, including: If there are multiple user terminal devices 30, the heating ratio for each user terminal device 30 will be adjusted according to their demand priority and operating mode.

[0039] Preferably, the heating ratio for each of the multiple user terminal devices 30 is adjusted according to their demand priority and operating mode, including: When T1-T2 < ΔT1 and T3-T2 < ΔT2, the heat supply from the heat storage device 20 to the user terminal equipment 30 is reduced. When T1-T2>ΔT3 and T3-T2>ΔT4, the heat supply from the heat storage device 20 to the user terminal equipment 30 is increased. Where T1 is the user-set temperature, T2 is the indoor ambient temperature, and T3 is the refrigerant temperature; ΔT1 is the first preset temperature difference value, ΔT2 is the second preset temperature difference value, ΔT3 is the third preset temperature difference value, and ΔT4 is the fourth preset temperature difference value.

[0040] In a specific example, the operating modes include a heating mode, a comfort mode, and a clothes-drying mode. The heating priority for air conditioning is set as first level, for radiators as second level, and for underfloor heating as third level. Therefore, the heating priority for air conditioning is the highest, while the heating priority for underfloor heating is the lowest. This can be specifically represented by allocating 50%, 30%, and 20% of the total heat output of the heat pump heating system 100 to the air conditioning, radiator, and underfloor heating systems, respectively.

[0041] Furthermore, the output circuit between the air conditioning equipment and the heat storage device 20 is defined as the first output circuit, and the corresponding input circuit between the air conditioning equipment and the heat source device 10 is defined as the first input circuit. The third control valve on the first output circuit is control valve a, denoted by MV1; and the fourth control valve on the first input circuit is control valve b, denoted by MV2.

[0042] The output circuit between the radiator equipment and the heat storage device 20 is defined as the second output circuit. Correspondingly, the input circuit between the radiator equipment and the heat source device 10 is defined as the second input circuit. The third control valve on the second output circuit is control valve a, denoted by MV3; the fourth control valve on the second input circuit is control valve b, denoted by MV4.

[0043] The output circuit between the underfloor heating equipment and the heat storage device 20 is defined as the third output circuit. Correspondingly, the input circuit between the underfloor heating equipment and the heat source device 10 is defined as the third input circuit. The third control valve on the third output circuit is control valve 3a, denoted by MV5. The fourth control valve on the third input circuit is control valve 3b, denoted by MV6.

[0044] Preferably, when it is determined that the heat storage in the heat storage device 20 meets the pre-storage conditions, the heat source device 10 is controlled to charge the heat storage device 20 in a second natural time period prior to the first natural time period. Among them, the first electricity price corresponding to the first natural time period is higher than the second electricity price corresponding to the second natural time period.

[0045] For example, the electricity price of the power grid system varies depending on the natural time. Taking peak-valley electricity as an example, the period from 8:00 AM to 10:00 PM is considered off-peak electricity, during which the heating components in the thermal storage device 20 can operate, thereby storing electrical energy as heat energy, which corresponds to the second natural time period. During the other natural time periods, which is the first natural time period mentioned in this technical solution, the electricity price is higher than that during the second natural time period. Therefore, controlling the heat source device 10 to charge the thermal storage device 20 during the second natural time period, which takes precedence over the first natural time period, can save electricity costs and reduce the user's operating costs.

[0046] Furthermore, the heat storage device 20 may also include heat storage material and refrigerant pipes. The heating component may specifically be an electric heater. Thus, in this case, for example, when the heat pump heating system 100 is in standby mode, it is not necessary to start the heat source device 10. The electric heater alone can achieve the effect of converting electrical energy into heat energy, which is then stored by the heat storage material. In the next startup phase, heat is supplied to the user terminal equipment 30 through the refrigerant pipes.

[0047] Furthermore, the heating component can be, for example, an external pipe placed in the heat pump heating system 100, which heats the heat storage material when the outdoor ambient temperature is high.

[0048] In another case, the heating component is a combination of an electric heater and a piped external heat pump heating system 100.

[0049] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A control method for a heat pump heating system, characterized in that, The heat pump heating system includes: A heat source device (10), a heat storage device (20), and at least one user terminal device (30); The heat storage device (20) is installed on the output circuit of the heat source device (10) and the at least one user terminal device (30) for transmitting the stored thermal energy to the at least one user terminal device (30); If the heat source device (10) supplies less heat to the at least one user terminal device (30) during the startup phase than the preset heat demand, then the heat storage device (20) is controlled to deliver the heat energy to the at least one user terminal device (30). The output circuit includes output circuit one (102) and output circuit two (101); The heat storage device (20) is located in the first output circuit (102), and the first output circuit (102) is provided with a first control valve at the position between the heat storage device (20) and the heat source device (10). The first control valve is used to control the connection or closure between the heat source device (10) and the heat storage device (20). The second output circuit (101) is connected between the heat source device (10) and the at least one user terminal device (30), and the second output circuit (101) is provided with a second control valve; The control method includes: After the heat pump heating system is turned on, the heating temperature of the cold medium in the heat source device (10) is obtained; Determine whether the heating temperature meets the heating conditions; If not, the heat storage device (20) performs a heating operation on the at least one user terminal device (30); The heating operation performed by the heat storage device (20) on the at least one user terminal device (30) includes: If there are multiple user terminal devices (30), the heating ratio of each user terminal device (30) is adjusted according to the demand priority and operation mode of the multiple user terminal devices (30); The adjustment of the heating ratio for each of the multiple user terminal devices (30) according to their demand priority and operating mode includes: When T1-T2 < ΔT1 and T3-T2 < ΔT2, the heat supplied by the heat storage device (20) to the user terminal equipment (30) is reduced. When T1-T2>ΔT3 and T3-T2>ΔT4, the heat supply from the heat storage device (20) to the user terminal equipment (30) is increased. Wherein, T1 is the user-set temperature, T2 is the indoor ambient temperature, and T3 is the refrigerant temperature; ΔT1 is the first preset temperature difference value, ΔT2 is the second preset temperature difference value, ΔT3 is the third preset temperature difference value, and ΔT4 is the fourth preset temperature difference value.

2. The control method according to claim 1, characterized in that, The output circuit is also provided with a third control valve, which is located between the output port of the heat storage device (20) and the corresponding input port of the user terminal device (30) for regulating the thermal energy input to the user terminal device; An input circuit is also connected between the heat source device (10) and the at least one user terminal device (30), the input circuit being used to return the cold medium from the corresponding user terminal device (30) to the heat source device (10).

3. The control method according to claim 2, characterized in that, The at least one user terminal device (30) includes at least one of an air conditioning device, a radiator device, and a floor heating device; And / or, the input circuit is further provided with a fourth control valve for adjusting the heat exchange parameters of the cold medium returned by the corresponding user terminal device (30) to the heat source device (10); wherein, the heat exchange parameters include the cold medium flow rate and the cold medium flow rate.

4. The control method according to claim 1, characterized in that, The determination of whether the heating temperature meets the heating conditions includes: If so, the heat source device (10) is controlled to perform the heating action on the at least one user terminal device (30).

5. The control method according to claim 4, characterized in that, The control of the heat source device (10) to perform the heating action on the at least one user terminal device (30) includes: Determine whether the heat storage capacity in the heat storage device (20) meets the pre-storage conditions; If so, the heat source device (10) is controlled to charge the heat storage device (20), and simultaneously the heating action is performed on the at least one user terminal device (30); and / or If not, then the heating action is performed only by the heat source device (10) on the at least one user terminal device (30).

6. The control method according to claim 5, characterized in that, If it is determined that the heat storage capacity in the heat storage device (20) meets the pre-storage conditions, the heat source device (10) is controlled to charge the heat storage device (20) in a second natural time period prior to the first natural time period. The first electricity price during the first natural time period is higher than the second electricity price during the second natural time period.

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