Commercial linkage energy-saving system and control method

Abstract

The invention discloses a commercial linkage energy-saving system and a control method. The commercial linkage energy-saving system comprises a controller, a fire pool, a heat pump, a boiler, a hot water tank, a first plate heat exchanger and a second plate heat exchanger. The fire pool is communicated with the first plate heat exchanger through a first water supply pipeline and a first water return pipeline, the second plate heat exchanger is communicated with the heat pump through a second water supply pipeline and a second water return pipeline, and the boiler is communicated with the second water supply pipeline through a third water supply pipeline and a third water return pipeline. And the fire pool is communicated with the second water supply pipeline through a fourth water supply pipeline. According to the commercial linkage energy-saving system and the control method, through cooperative arrangement of the controller, the fire pool, the heat pump, the boiler, the hot water tank, the first plate heat exchanger and the second plate heat exchanger, the efficiency of each device is effectively improved, energy conservation and emission reduction are achieved, and the operation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and in particular to a commercial linkage energy-saving system and a control method. Background Art

[0002] The mainstream commercial HVAC products on the market include commercial heat pumps and boilers:

[0003] Using a commercial heat pump alone takes up a large area, has poor heating stability and low comfort, but it can effectively utilize the environment to provide heat, and is energy-saving and environmentally friendly under special environmental conditions.

[0004] The effect of using boiler exhaust alone is slightly worse than that of heat pump. It cannot provide cooling in summer, but the heat source is constant in winter and the comfort is high.

[0005] The main solution currently available on the market is to provide heating and cooling separately, and the two cannot be effectively linked and their functions cannot be effectively coordinated.

[0006] Based on the above situation, the present invention proposes a commercial linkage energy-saving system and control method, which can effectively solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a commercial linkage energy-saving system and control method. The commercial linkage energy-saving system and control method of the present invention are easy to use, and through the coordinated arrangement between the controller, the fire water tank, the heat pump, the boiler, the hot water tank, the first plate heat exchanger and the second plate heat exchanger, the efficiency of each device is effectively improved, energy is saved and emissions are reduced, and the operating cost is reduced. The disadvantage of low utilization rate of commercial places at night is effectively used for energy storage, and the comfort during daytime operation is improved.

[0008] The present invention is achieved through the following technical solutions:

[0009] A commercial linkage energy-saving system, comprising a controller, a fire water tank, a heat pump, a boiler, a hot water tank, a first plate heat exchanger and a second plate heat exchanger;

[0010] The fire water tank is connected to the first plate heat exchanger through the first water supply pipeline and the first return water pipeline, respectively. The second plate heat exchanger is connected to the heat pump through the second water supply pipeline and the second return water pipeline, respectively. The boiler is connected to the second water supply pipeline through the third water supply pipeline and the third return water pipeline, respectively. The fire water tank is connected to the second water supply pipeline through the fourth water supply pipeline, and the fire water tank is connected to the second return water pipeline through the fourth return water pipeline. The first plate heat exchanger is connected to the second water supply pipeline through the fifth water supply pipeline, and the first plate heat exchanger is connected to the second water supply pipeline through the fifth return water pipeline. The boiler is connected to the hot water tank through the sixth water supply pipeline and the sixth return water pipeline, respectively. The connection between the fourth water supply pipeline and the second water supply pipeline A first electric regulating valve is provided, a second electric regulating valve is provided at the connection between the fourth return water pipeline and the second return water pipeline, a third electric regulating valve is provided at the connection between the third water supply pipeline and the second water supply pipeline, a fourth electric regulating valve is provided at the connection between the third return water pipeline and the second water supply pipeline, a fifth electric regulating valve is provided at the connection between the fifth water supply pipeline and the second water supply pipeline, a sixth electric regulating valve is provided at the connection between the fifth return water pipeline and the second return water pipeline, the controller is electrically connected to the first electric regulating valve, the second electric regulating valve, the third electric regulating valve, the fourth electric regulating valve, the fifth electric regulating valve and the sixth electric regulating valve respectively, and the second plate heat exchanger is connected to the terminal system through the seventh water supply pipeline and the seventh return water pipeline respectively.

[0011] The commercial linkage energy-saving system and control method of the present invention are easy to use. Through the coordinated arrangement of the controller, the fire water tank, the heat pump, the boiler, the hot water tank, the first plate heat exchanger and the second plate heat exchanger, the efficiency of each device is effectively improved, energy is saved and emissions are reduced, and operating costs are reduced. The disadvantage of low utilization rate of commercial places at night is effectively utilized for energy storage, and the comfort during daytime operation is improved.

[0012] Preferably, a first temperature sensor is provided on the fourth water supply pipeline, and a second temperature sensor is provided on the fourth water return pipeline.

[0013] A control method for the commercial linkage energy-saving system as described above comprises the following steps:

[0014] Step S1: when it is summer, turn on the summer cooling function; when it is winter, turn on the winter heating function;

[0015] Step S2: After turning on the summer cooling function, the heat pump obtains cooling energy during the off-peak period at night and stores it in the fire water tank for use during the peak period or when the cooling is insufficient during the day. The boiler supplies hot water demand alone in summer.

[0016] Or after turning on the winter heating function, select high-efficiency mode or comfort mode as needed.

[0017] Preferably, the high-efficiency mode includes the following steps:

[0018] Step S211: When the heat pump can obtain sufficient heat and Releaseintegral heating < Release integral heating_setpoint, the heat pump is used for heating, and at this time, the coefficient of performance of the heat pump is relatively high;

[0019] Step S2111: If there is no heating demand or the heating demand is very low in the terminal system, after the controller collects and processes the information, the sixth electric control valve and the fifth electric control valve can be adjusted to open the heat exchange between the fire pool and the heat pump to store the heat energy;

[0020] Step S212: When the heat pump cannot obtain sufficient heat and Releaseintegral heating < Release integral heating_setpoint, the heat pump and the boiler are started;

[0021] Step S213: When the heat pump cannot obtain sufficient heat and then the boiler is started;

[0022] Step S214: When the heat pump cannot obtain sufficient heat, if there is a heating demand in the terminal system at this time, the controller adjusts the second electric control valve and the first electric control valve to first use the heat stored in the fire pool to heat the terminal system until the difference between the supply water temperature T2 and the return water temperature T1 of the fire pool is less than the set temperature △T1, and the heat exchange of the fire pool stops;

[0023] Wherein, Tarrif_ele is the electricity price, Tarrif_gas is the natural gas price, Eff_gas is the boiler efficiency, Release integral heating is the operation integral of the heating auxiliary heat source, and Release integral heating_setpoint is the set value of the operation integral of the heating auxiliary heat source;

[0024] When Toutside > 0°C, Cop = (outdoor temperature * 0.09 + 2.8) / ((T2_heating setpoint / 45)^0.5)()

[0025] When Toutside ≤ 0°C, Cop = (outdoor temperature * 0.06 + 2.8) / ((T2_heating setpoint / 48)^0.5) (when Toutside ≤ 0°C).

[0026] Preferably, the comfort mode comprises the following steps:

[0027] Step S221: When the boiler main water supply temperature is lower than the difference between the boiler main heating set water supply temperature and the boiler main heating water supply temperature hysteresis, that is, T4_sensor<T4_heating setpoint-T4_Heating hysteresis, the heat source sequential operation integral will be calculated;

[0028] Step S222: When the heat source sequential operation integral reaches the supply Warm auxiliary heat source operation points When the default value is set, a closing signal is output to start the heating mode of the boiler;

[0029] Step S223: When the boiler main water supply temperature rises to the upper hysteresis, that is, T4_sensor>=T4_heatingsetpoint+T4_Heating hysteresis, the signal is disconnected and the heating mode of the boiler is turned off.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] 1. The present invention can appropriately reduce the number of equipment configurations according to demand, effectively transform and utilize the fire water tank, and improve the utilization rate of each equipment;

[0032] 2. The present invention effectively improves the efficiency of each device, saves energy and reduces emissions, and reduces operating costs through the intelligent linkage of the controller.

[0033] 3. The present invention can effectively utilize the disadvantage of low utilization rate of boilers in commercial places at night to store energy and improve the comfort during daytime operation.

[0034] 4. The present invention solves the limitation that commercial heat pumps cannot be used in low-temperature areas, thereby improving the safety of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary description and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only for exemplary description and cannot be understood as a limitation on this patent.

[0037] Embodiment 1:

[0038] like Figure 1 As shown, the present invention provides a commercial linkage energy-saving system, including a controller, a fire water tank 2, a heat pump 3, a boiler 4, a hot water tank 5, a first plate heat exchanger 6 and a second plate heat exchanger 7;

[0039] The fire water tank 2 is connected to the first plate heat exchanger 6 through the first water supply pipeline 21 and the first return water pipeline 22 respectively, the second plate heat exchanger 7 is connected to the heat pump 3 through the second water supply pipeline 71 and the second return water pipeline 72 respectively, the boiler 4 is connected to the second water supply pipeline 71 through the third water supply pipeline 41 and the third return water pipeline 42 respectively, the fire water tank 2 is connected to the second water supply pipeline 71 through the fourth water supply pipeline 23, the fire water tank 2 is connected to the second return water pipeline 72 through the fourth return water pipeline 24, the first plate heat exchanger 6 is connected to the second water supply pipeline 71 through the fifth water supply pipeline 61, the first plate heat exchanger 6 is connected to the second water supply pipeline 71 through the fifth return water pipeline 62, the boiler 4 is connected to the hot water tank 5 through the sixth water supply pipeline 43 and the sixth return water pipeline 44 respectively, and the connection between the fourth water supply pipeline 23 and the second water supply pipeline 71 is provided with a There is a first electric regulating valve 81, a second electric regulating valve 82 is provided at the connection between the fourth return water pipeline 24 and the second return water pipeline 72, a third electric regulating valve 83 is provided at the connection between the third water supply pipeline 41 and the second water supply pipeline 71, a fourth electric regulating valve 84 is provided at the connection between the third return water pipeline 42 and the second water supply pipeline 71, a fifth electric regulating valve 85 is provided at the connection between the fifth water supply pipeline 61 and the second water supply pipeline 71, and a sixth electric regulating valve 86 is provided at the connection between the fifth return water pipeline 62 and the second return water pipeline 72. The controller is electrically connected to the first electric regulating valve 81, the second electric regulating valve 82, the third electric regulating valve 83, the fourth electric regulating valve 84, the fifth electric regulating valve 85, and the sixth electric regulating valve 86 respectively, and the second plate heat exchanger 7 is connected to the terminal system 1 through the seventh water supply pipeline 73 and the seventh return water pipeline 74 respectively.

[0040] Embodiment 2:

[0041] like Figure 1 As shown, the present invention provides a commercial linkage energy-saving system, including a controller, a fire water tank 2, a heat pump 3, a boiler 4, a hot water tank 5, a first plate heat exchanger 6 and a second plate heat exchanger 7;

[0042] The fire water tank 2 is connected to the first plate heat exchanger 6 through the first water supply pipeline 21 and the first return water pipeline 22 respectively, the second plate heat exchanger 7 is connected to the heat pump 3 through the second water supply pipeline 71 and the second return water pipeline 72 respectively, the boiler 4 is connected to the second water supply pipeline 71 through the third water supply pipeline 41 and the third return water pipeline 42 respectively, the fire water tank 2 is connected to the second water supply pipeline 71 through the fourth water supply pipeline 23, the fire water tank 2 is connected to the second return water pipeline 72 through the fourth return water pipeline 24, the first plate heat exchanger 6 is connected to the second water supply pipeline 71 through the fifth water supply pipeline 61, the first plate heat exchanger 6 is connected to the second water supply pipeline 71 through the fifth return water pipeline 62, the boiler 4 is connected to the hot water tank 5 through the sixth water supply pipeline 43 and the sixth return water pipeline 44 respectively, and the connection between the fourth water supply pipeline 23 and the second water supply pipeline 71 is provided with a There is a first electric regulating valve 81, a second electric regulating valve 82 is provided at the connection between the fourth return water pipeline 24 and the second return water pipeline 72, a third electric regulating valve 83 is provided at the connection between the third water supply pipeline 41 and the second water supply pipeline 71, a fourth electric regulating valve 84 is provided at the connection between the third return water pipeline 42 and the second water supply pipeline 71, a fifth electric regulating valve 85 is provided at the connection between the fifth water supply pipeline 61 and the second water supply pipeline 71, and a sixth electric regulating valve 86 is provided at the connection between the fifth return water pipeline 62 and the second return water pipeline 72. The controller is electrically connected to the first electric regulating valve 81, the second electric regulating valve 82, the third electric regulating valve 83, the fourth electric regulating valve 84, the fifth electric regulating valve 85, and the sixth electric regulating valve 86 respectively, and the second plate heat exchanger 7 is connected to the terminal system 1 through the seventh water supply pipeline 73 and the seventh return water pipeline 74 respectively.

[0043] The fourth water supply pipeline 23 is provided with a first temperature sensor 91 , and the fourth water return pipeline 24 is provided with a second temperature sensor 92 .

[0044] In winter, heating is the main purpose, and boiler 4 assists heat pump 3 in heating. When heat pump 3 does not provide enough heat, boiler 4 is used to heat the end of the heating system according to normal demand. When heat pump 3 can obtain sufficient heat source, heat pump 3 is fully utilized to heat the end of the heating system. When the heating demand is too low or there is no heating demand during the day, heat pump 3 can be used to heat and store heat in fire water pool 2 for use when there is a heating demand at night. While fully utilizing heat pump 3, the comfort of the heating area is ensured. At the same time, boiler 4 can assist heat pump 3 equipment in antifreeze.

[0045] In summer, cooling is the main supply. The utilization rate of commercial places is low at night, and the cooling demand is low. Heat pump 3 can obtain cooling capacity during the off-peak period at night and store it in the fire water tank, and use it during the peak period or when the cooling is insufficient during the day. While ensuring that the needs of users are met at all times, it effectively reduces costs, saves energy and is environmentally friendly. At the same time, the boiler can supply hot water demand alone in summer.

[0046] 1. Winter heating and hot water operation plan

[0047] In winter, when heat pump 3 can obtain sufficient heat sources, heat pump 3 is used for heating first, and the controller adjusts the three-way valve to form a passage between heat pump 3 and the plate exchange at the end of the system. At this time, heat pump 3 can only have a high performance coefficient, but if there is no heating demand at the end of the system or the heating demand is very low (the ambient temperature is high), the controller collects information and judges and processes it, and can open the fire water tank and heat pump 3 for heat exchange to store heat energy. When the heating performance coefficient of heat pump 3 is lower than the 3rd level energy efficiency, when there is a heat demand at the heating end, the controller adjusts the system and uses the heat stored in the fire water tank 2 to heat the heating end system 1 until the temperature difference between the outflow and return water of the fire water tank 2 is less than the set temperature △T1. The system is adjusted to heat pump 3 and boiler 4 in series, and heat pump 3 assists boiler 4 to heat the heating end. At this time, the ambient temperature is theoretically low, and boiler 4 can also assist heat pump 3 in antifreeze.

[0048] At the same time, commercial places are generally open only during the day, and the hot water temperature requirement is relatively low (no need for bathing, only for washing hands), and the boiler 4 can heat the hot water storage tank for a large amount of time during the day.

[0049] 2. Summer cooling and hot water operation plan

[0050] In summer, the temperature is low at night and it is off-peak time. The utilization rate of commercial places is low at night, and the cooling demand is low. The controller gives priority to adjusting the heat pump 3 to cool the fire water tank 2 to store cold energy. When there is a cooling demand during the day, the cold energy stored in the fire water tank 2 at night is used for cooling. When the cooling is insufficient, the heat pump 3 is turned on to assist in cooling. The boiler 4 can provide sufficient hot water demand throughout the day.

[0051] 3. System configuration description

[0052] The system controller can read and control all regulating valves, sensors, control units, electricity meters, heat meters and flow meters in the system, including the needs of the terminal system 1, output commands through operating conditions, control all system configurations, and perform energy-saving analysis and AI intelligent analysis and learning of the entire system to further optimize resource utilization.

[0053] A control method for the commercial linkage energy-saving system as described above comprises the following steps:

[0054] Step S1: When it is summer, turn on the summer cooling function; when it is winter, turn on the winter heating function;

[0055] Step S2: After turning on the summer cooling function, the heat pump 3 obtains cold energy during the off-peak electricity period at night and stores it in the fire fighting water tank for use during the peak electricity period during the day or when the cooling is insufficient. The boiler 4 supplies the hot water demand alone in summer;

[0056] Or after turning on the winter heating function, select the high-efficiency mode or the comfort mode as needed.

[0057] Further, in another embodiment, the high-efficiency mode includes the following steps:

[0058] Step S211: When the heat pump 3 can obtain sufficient heat, and Releaseintegral heating < Release integral heating_setpoint, then use the heat pump 3 for heating. At this time, the heating performance coefficient of the heat pump 3 is relatively high;

[0059] Step S2111: If there is no heating demand or the heating demand is very low in the terminal system, after the controller collects and processes the information, it can adjust the sixth electric control valve 86 and the fifth electric control valve 85 to open the heat exchange between the fire fighting water tank 2 and the heat pump 3 to store the heat energy;

[0060] Step S212: When the heat pump 3 cannot obtain sufficient heat, and Releaseintegral heating < Release integral heating_setpoint, then start the heat pump 3 and the boiler 4;

[0061] Step S213: When the heat pump 3 cannot obtain sufficient heat, and then start the boiler 4;

[0062] Step S214: When the heat pump 3 cannot obtain sufficient heat, if there is a heating demand in the terminal system 1 at this time, the controller adjusts the second electric control valve 82 and the first electric control valve 81 to first use the heat stored in the fire fighting water tank 2 to heat the terminal system 1 until the difference between the supply water temperature T2 and the return water temperature T1 of the fire fighting water tank 2 is less than the set temperature △T1, and the heat exchange of the fire fighting water tank 2 stops;

[0063] Wherein, Tarrif_ele is the electricity price, Tarrif_gas is the natural gas price, Eff_gas is the efficiency of the boiler 4, Release integral heating is the integral for starting the heating auxiliary heat source, and Release integral heating_setpoint is the set value of the integral for starting the heating auxiliary heat source;

[0064] When Toutside>0℃, Cop=(outdoor temperature*0.09+2.8) / ((T2_heating setpoint / 45)^0.5)()

[0065] When Toutside≤0℃, Cop=(outdoor temperature*0.06+2.8) / ((T2_heating setpoint / 48)^0.5)(when Toutside≤0℃).

[0066] Further, in another embodiment, the comfort mode comprises the following steps:

[0067] Step S221: when the boiler 4 main pipe water supply temperature is lower than the difference between the boiler 4 main pipe heating water supply temperature setting and the boiler 4 main pipe heating water supply temperature hysteresis, that is, T4_sensor<T4_heating setpoint-T4_Heatinghysteresis, the heat source sequential operation integral will be calculated;

[0068] Step S222: When the heat source sequential operation integral reaches the supply Warm auxiliary heat source operation points When the default value is set, a closing signal is output to start the heating mode of boiler 4;

[0069] Step S223: When the water supply temperature of the main pipe of boiler 4 rises to the upper hysteresis, that is, T4_sensor>=T4_heatingsetpoint+T4_Heating hysteresis, the signal is disconnected and the heating mode of boiler 4 is turned off.

[0070] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the commercial linkage energy-saving system of the present invention, and can produce the positive effects recorded in the present invention.

[0071] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0072] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A commercial linkage energy-saving system, characterized in that: It includes a controller, a fire water tank, a heat pump, a boiler, a hot water tank, a first plate heat exchanger and a second plate heat exchanger; The fire water tank is connected to the first plate heat exchanger through the first water supply pipeline and the first return water pipeline, respectively. The second plate heat exchanger is connected to the heat pump through the second water supply pipeline and the second return water pipeline, respectively. The boiler is connected to the second water supply pipeline through the third water supply pipeline and the third return water pipeline, respectively. The fire water tank is connected to the second water supply pipeline through the fourth water supply pipeline, and the fire water tank is connected to the second return water pipeline through the fourth return water pipeline. The first plate heat exchanger is connected to the second water supply pipeline through the fifth water supply pipeline, and the first plate heat exchanger is connected to the second water supply pipeline through the fifth return water pipeline. The boiler is connected to the hot water tank through the sixth water supply pipeline and the sixth return water pipeline, respectively. The connection between the fourth water supply pipeline and the second water supply pipeline A first electric regulating valve is provided, a second electric regulating valve is provided at the connection between the fourth return water pipeline and the second return water pipeline, a third electric regulating valve is provided at the connection between the third water supply pipeline and the second water supply pipeline, a fourth electric regulating valve is provided at the connection between the third return water pipeline and the second water supply pipeline, a fifth electric regulating valve is provided at the connection between the fifth water supply pipeline and the second water supply pipeline, a sixth electric regulating valve is provided at the connection between the fifth return water pipeline and the second return water pipeline, the controller is electrically connected to the first electric regulating valve, the second electric regulating valve, the third electric regulating valve, the fourth electric regulating valve, the fifth electric regulating valve and the sixth electric regulating valve respectively, and the second plate heat exchanger is connected to the terminal system through the seventh water supply pipeline and the seventh return water pipeline respectively.

2. The commercial linkage energy-saving system according to claim 1, characterized in that: The fourth water supply pipeline is provided with a first temperature sensor, and the fourth water return pipeline is provided with a second temperature sensor.

3. A control method for a commercial linkage energy-saving system according to any one of claims 1 to 2, characterized in that: The following steps are involved: Step S1: when it is summer, turn on the summer cooling function; when it is winter, turn on the winter heating function; Step S2: After turning on the summer cooling function, the heat pump obtains cooling energy during the off-peak period at night and stores it in the fire water tank for use during the peak period or when the cooling is insufficient during the day. The boiler supplies hot water demand alone in summer. Or after turning on the winter heating function, select high-efficiency mode or comfort mode as needed.

4. The control method of the commercial linkage energy-saving system according to claim 3 is characterized in that: The high efficiency mode comprises the following steps: Step S211: When the heat pump can obtain sufficient heat and Releaseintegral heating<Release integral heating_setpoint, the heat pump is used for heating. At this time, the coefficient of performance of the heat pump is relatively high; Step S2111: If the terminal system has no heating demand or the heating demand is very low, the controller collects information and makes judgments and processes it, and can adjust the sixth electric regulating valve and the fifth electric regulating valve, open the fire water tank and the heat pump for heat exchange, and store the heat energy; Step S212: When the heat pump cannot obtain sufficient heat and Releaseintegral heating<Release integral heating_setpoint, start the heat pump and the boiler; Step S213: When the heat pump cannot obtain sufficient heat, and Then start the boiler; Step S214: When the heat pump cannot obtain sufficient heat, if the terminal system has a heating demand, the controller adjusts the second electric regulating valve and the first electric regulating valve, and first uses the heat stored in the fire water tank to heat the terminal system until the difference between the supply water temperature T2 and the return water temperature T1 of the fire water tank is less than the set temperature △T1, and the fire water tank stops heat exchange; Among them, Tarrif_ele is the electricity price, Tarrif_gas is the natural gas price, Eff_gas is the boiler efficiency, Release integral heating is the heating auxiliary heat source operation integral, and Release integral heating_set point is the heating auxiliary heat source operation integral set value; When Toutside>0℃, Cop=(outdoor temperature*0.09+2.8) / ((T2_heating setpoint / 45)^0.5)() When Toutside≤0℃, Cop=(outdoor temperature*0.06+2.8) / ((T2_heating setpoint / 48)^0.5)(when Toutside≤0℃).

5. The control method of the commercial linkage energy-saving system according to claim 3 is characterized in that: The comfort mode includes the following steps: Step S221: When the boiler main water supply temperature is lower than the difference between the boiler main heating set water supply temperature and the boiler main heating water supply temperature hysteresis, that is, T4_sensor<T4_heating setpoint-T4_Heating hysteresis, the heat source sequential operation integral will be calculated; Step S222: When the heat source sequential operation integral reaches the supply Warm auxiliary heat source operation points When the default value is set, a closing signal is output to start the heating mode of the boiler; Step S223: When the boiler main water supply temperature rises to the upper hysteresis, that is, T4_sensor>=T4_heatingsetpoint+T4_Heating hysteresis, the signal is disconnected and the heating mode of the boiler is turned off.

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