Composite cold and heat source multi-mode control system

Abstract

The utility model relates to a composite cold and heat source multi-mode control system which comprises a ground source heat pump system, an air source heat pump system and a DDC control system, the ground source heat pump system and the air source heat pump system are respectively connected with an indoor energy utilization system, and the DDC control system is used for receiving signals of the ground source heat pump system and the air source heat pump system. And the controlled object is controlled according to a preset control algorithm, so that automatic management is realized. The PID control module can intelligently adjust output of the ground source heat pump system and the air source heat pump system according to environmental parameters, more accurate temperature control is achieved, and energy efficiency is improved. And the air source heat pump system is used as an auxiliary energy supply, so that the operation modes are more diversified, and meanwhile, the problems of cold and heat accumulation and insufficient underground heat exchange space caused by non-uniform heat removal can be solved.

Description

Technical Field

[0001] This utility model relates to the field of cold and heat source control and energy-saving technology, and in particular to a composite cold and heat source multi-mode control system. Background Technology

[0002] A ground source heat pump is an air conditioning system that utilizes shallow geothermal resources on the Earth's surface as a heat source and cooling source. Due to its energy-saving, environmentally friendly, and stable characteristics, its application in public buildings is becoming increasingly widespread. Public buildings have large heating and cooling load demands, often requiring multiple ground source heat pump units to operate simultaneously to meet the building's energy needs.

[0003] However, existing ground source heat pump control systems lack flexibility in use and cannot adjust and control according to the real-time load of the building at different times, which not only affects the comfort of users but also makes it difficult to effectively control electricity costs.

[0004] The uneven power output of ground source heat pumps during winter and summer can lead to geothermal imbalance, which has a certain impact on the environment.

[0005] Multiple ground source heat pump units operate independently, resulting in complex operation and a single operating mode. More advanced control technologies and intelligent management systems are needed to precisely control the operation of the ground source heat pump system and improve energy efficiency. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a multi-mode control system for composite cold and heat sources. This system adopts multiple analog input / output and digital output modules, and uses a PID module to control the unit's operation in a closed-loop control system. It can realize multi-scenario mode settings and is easy and flexible to operate. By adding an air source heat pump system and coupling it with a ground source heat pump system, not only can the problem of cold and heat accumulation in ground source heat pumps be solved, but the energy efficiency ratio of a single ground source heat pump can also be improved.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A multi-mode control system for composite heat and cold sources includes a ground source heat pump system, an air source heat pump system, and a DDC control system. The ground source heat pump system includes a ground source heat pump unit, a buried water pipe, a ground source heat pump unit on / off valve, multiple ground source-side water pumps, a user-side water pump, and an indoor energy consumption system. The inlet of the ground source heat pump unit is connected to the buried water pipe via a pipeline, and the outlet of the ground source heat pump unit is connected to the indoor energy consumption system via a pipeline. The multiple ground source-side water pumps are connected in parallel on the water supply pipeline between the ground source heat pump unit and the buried water pipe. The user-side water pump is located on the water supply pipeline between the ground source heat pump unit and the indoor energy consumption system. The ground source heat pump unit on / off valve is located at the inlet of the ground source heat pump unit. The air source heat pump system includes an air source heat pump unit, an air source heat pump unit, and a DDC control system. The system includes a gas-source heat pump main unit switching valve and an air-source water pump. The air-source water pump is installed on the water supply pipeline between the air-source heat pump main unit and the indoor energy system. The air-source heat pump main unit switching valve is located at the water supply end of the air-source heat pump main unit. The DDC control system includes a PID control module, an input module, and an output module. The output module is electrically connected to the ground-source side water pump, the user-side water pump, and the air-source water pump via a three-phase contactor. The output module is also electrically connected to the ground-source heat pump main unit switching valve and the air-source heat pump main unit switching valve via a relay. The output module includes a timer, a trigger, and logic and command elements. The input module is connected to the output module through the output terminal of the trigger. The three-phase contactor and the relay are electrically connected to the corresponding timer or logic and command elements, respectively.

[0009] Furthermore, in the above-mentioned utility model, the ground source heat pump system further includes a second ground source heat pump unit, the water inlet of the second ground source heat pump unit is connected to a buried water pipe through a pipeline, and the water outlet of the second ground source heat pump unit is connected to an indoor energy system through a pipeline.

[0010] Furthermore, in the above-mentioned utility model, a switching valve group is provided on the water supply terminal pipe of the ground source heat pump system and the air source heat pump, and the switching valve group is electrically connected to the DDC control system.

[0011] Furthermore, in the above-mentioned utility model, a proportional regulating valve electrically connected to the DDC control system is provided between the water supply pipe and the return water pipe of the indoor energy system.

[0012] Furthermore, in the above-mentioned utility model, a pressure sensor electrically connected to the DDC control system is installed between the water supply pipe and the return pipe of the indoor energy system.

[0013] Furthermore, in the above-mentioned utility model, a heat meter is installed on the pipeline between the buried water pipe and the ground source side water pump.

[0014] Furthermore, in the above-mentioned utility model, a temperature sensor is installed on the pipeline between the buried water pipe and the ground source side water pump.

[0015] The beneficial effects of this utility model are:

[0016] This invention, by adding a PID control module and corresponding monitoring components, can intelligently adjust the output of the ground source heat pump system and the air source heat pump system according to set parameters, achieving more precise temperature control and improving energy efficiency. Adding an air source heat pump system as an auxiliary energy supplier diversifies the operating modes and also balances the problems of uneven heat extraction leading to heat accumulation and insufficient underground heat exchange space, protecting the long-term stable operation of the ground source heat pump system. This provides a new direction for the development of ground source heat pump technology. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the signal line connection of this utility model. Figure 1 ;

[0019] Figure 3 This is a schematic diagram of the signal line connection of this utility model. Figure 2 ;

[0020] Figure 4 This is a schematic diagram of the signal line connection of this utility model. Figure 3 ;

[0021] Figure 5 This is the program logic function diagram of this utility model.

[0022] In the diagram, the components are: 1. Ground source heat pump unit; 2. Ground source heat pump unit; 3. Buried water pipe; 4. Ground source heat pump main unit switch valve; 5. Ground source side water pump; 6. User side water pump; 7. Air source heat pump main unit; 8. Air source heat pump main unit switch valve; 9. Air source water pump; 10. Switching valve group; 11. Proportional regulating valve; 12. Heat meter; 13. Temperature sensor; 14. Pressure sensor; 15. Indoor energy system; 16. DDC control system. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0024] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0025] Example:

[0026] A multi-mode control system for a composite cold and heat source, see appendix. Figure 1 As shown, the system includes a ground source heat pump system, an air source heat pump system, and a DDC control system 16. The ground source heat pump system includes a ground source heat pump unit 1, a buried water pipe 3, a ground source heat pump unit on / off valve 4, multiple ground source side water pumps 5, a user side water pump 6, and an indoor energy system 15. The water inlet of the ground source heat pump unit 1 is connected to the buried water pipe 3 through a pipeline, and the water outlet of the ground source heat pump unit 1 is connected to the indoor energy system 15 through a pipeline. The multiple ground source side water pumps 5 are arranged in parallel on the water supply pipeline between the ground source heat pump unit 1 and the buried water pipe 3. The user side water pump 6 is arranged on the water supply pipeline between the ground source heat pump unit 1 and the indoor energy system 15. The ground source heat pump unit on / off valve 4 is located at the water inlet of the ground source heat pump unit 1.

[0027] The air source heat pump system includes an air source heat pump main unit 7, an air source heat pump main unit switch valve 8, and an air source water pump 9. The air source water pump 9 is installed on the water supply pipeline between the air source heat pump main unit 7 and the indoor energy system 15. The air source heat pump main unit switch valve 8 is installed at the water supply end of the air source heat pump main unit 7.

[0028] The DDC control system includes a PID control module, an input module, and an output module. The output module is electrically connected to the ground source water pump, the user-side water pump, and the air source water pump via three-phase contactors. The output module is also electrically connected to the ground source heat pump main unit switching valve and the air source heat pump main unit switching valve via relays. The output module contains timers, triggers, and logic and command elements. The input module is connected to the output module through the output terminal of the triggers. The feedback signals of the three-phase contactors and relays are respectively connected to the corresponding timers or logic and command elements.

[0029] See appendix Figure 2As shown, the start and stop of the ground source heat pump system is achieved through the logic control program of the DDC control system. When the ground source heat pump system receives a start signal, the system detects and opens the ground source heat pump host switch valve 4. The feedback signal of the ground source heat pump host switch valve 4 and the start command together serve as the trigger condition for timer one. After timer one counts for 60 seconds, the user-side water pump 6 is opened. At the same time, timer three is activated and starts counting. After timer three counts for 30 seconds, the ground source side water pump 5 is opened. The two sets of water pump start signals trigger timer five of the ground source heat pump host 1 after being processed by logic AND command. After another 30 minutes of counting, the ground source heat pump host 1 is started and the system begins to run. Similarly, when the ground source heat pump system receives a stop signal, the system detects and closes the ground source heat pump host switch valve 4. After timer two counts for 60 seconds, the user-side water pump 6 is shut down. At the same time, timer four is activated and starts counting. After timer four counts for 90 seconds, the ground source side water pump 5 is shut down. The two sets of water pump start signals trigger timer six of the ground source heat pump host 1 after a logical AND command. After another 10 seconds of counting, the ground source heat pump host 1 is shut down, and the system stops operating.

[0030] Please continue to refer to the appendix. Figure 1 As shown, the ground source heat pump system also includes a second ground source heat pump unit 2. The inlet of the second ground source heat pump unit 2 is connected to the buried water pipe 3 via a pipeline, and the outlet of the second ground source heat pump unit 2 is connected to the indoor energy system 15 via a pipeline. The second ground source heat pump unit 2 and the ground source heat pump unit 1 are of the same model and serve as backups for each other. Furthermore, a temperature sensor 13 is installed on the pipeline between the buried water pipe 3 and the ground source side water pump 5. When the temperature difference between the supply and return water pipes exceeds a certain value, the second ground source heat pump unit 2 can be activated, thereby increasing the cooling or heating capacity of the system. For details, please refer to the appendix. Figure 2 As shown, when the temperature sensor 13 detects a temperature difference greater than 5°C between the supply and return water pipes, the ground source heat pump host 2's switching valve 4 is activated, and timer seven is started. After timer seven counts for 30 seconds, the second ground source heat pump host 2 opens, and the second ground source heat pump host 2 intervenes in the entire system, thereby reducing the temperature difference between the supply and return water pipes and enhancing the overall system performance. Similarly, when the temperature sensor 13 detects a temperature difference less than 5°C between the supply and return water pipes, the DDC control system controls the second ground source heat pump host 2's switching valve 4 to close, and the second ground source heat pump host 2 shuts down after timer counts for 10 seconds.

[0031] The air source heat pump system described in this invention can operate under low load conditions (such as holidays). Specifically, when the air source heat pump system is activated, a logic-based non-command control closes the ground source heat pump main unit's switching valve 4 and simultaneously opens the air source heat pump main unit's switching valve 8. After timer nine counts for 10 seconds, the air source water pump 9 is turned on, and timer eleven is activated. After a further 60-second delay, the air source heat pump main unit 7 begins operation. Similarly, when the ground source heat pump system needs to be reused, a logic-based non-command control opens the ground source heat pump main unit's switching valve 4 and closes the air source heat pump main unit's switching valve. After timer ten counts for 10 seconds, the air source water pump 9 is turned off, and timer twelve is activated. After a further 10-second delay, the air source heat pump main unit 7 stops operating, and the entire system switches to ground source heat pump system operation.

[0032] In the above embodiments, the start-up methods of the air source heat pump system and the ground source heat pump system can be automatically or manually controlled through a pre-set schedule. During automatic start-up, the system issues a start-up command when the time specified in the schedule arrives. For details, please refer to the appendix. Figure 4 The diagram shows a time-sharing start-up logic. Mode 1 can be set to start the ground source heat pump system from 7:30 AM to 11:00 PM on weekdays and the air source heat pump system from 7:30 AM to 11:00 PM on holidays. Alternatively, Mode 2 can be set to start the ground source heat pump system from 7:30 AM to 11:00 PM all day. Yet another option is Mode 3, which also shows the air source heat pump system starting from 7:30 AM to 11:00 PM all day. (See appendix.) Figure 1 As shown, a switching valve assembly 10 is installed on the water supply terminal pipes of both the ground source heat pump system and the air source heat pump system. This switching valve assembly is electrically connected to the DDC control system. When the air source heat pump system and the ground source heat pump system switch operation, the switching valve of the corresponding heat pump system is opened, and the switching valve of the other system is interlocked and closed. Please refer to the appendix for further details. Figure 1 As shown, a heat meter 12 is installed on the pipeline between the buried water pipe 3 and the ground source water pump 5. The heat meter 12 records the cumulative heat (cold) output of the buried water pipe 3 on a one-year cycle. When the heat (cold) output is unbalanced, the air source heat pump system is manually turned on during the non-heating and cooling seasons to backfill the soil with cold (heat) output, so as to ensure that the soil source heat is constant and solve the soil source heat imbalance caused by the unequal heat (cold) output.

[0033] Please refer to the appendix for further details. Figure 5As shown, the multi-mode control system for composite cold and heat sources provided by this utility model can also determine the number of ground source side water pumps 5 that need to be operated based on the real-time load demand of the indoor energy system 15 and the high-efficiency operating range of the ground source side water pumps 5. Specifically, a pressure sensor 14 electrically connected to the DDC control system 16 is installed between the supply and return water pipes of the indoor energy system 15. The pressure sensor 14 monitors the pressure of the supply and return water pipes. The water pressure is received by the input template and transmitted to the PID control module. The PID control module determines the load adjustment trend based on the supply and return water pressure difference signal and adjusts the water pump operating efficiency through the output template. When the measured value of the supply and return water pressure difference is greater than the set value, the water pump operating frequency is reduced. When the operating frequency is lower than the lower limit, the system will reduce the number of ground source side water pumps 5 to further reduce energy consumption, and vice versa. This system has a proportional regulating valve 11 electrically connected to the DDC control system installed between the water supply and return pipes of the indoor energy system. Under normal circumstances, the proportional regulating valve 11 is in the closed state. It will only open when only one unit is running and the water pump frequency reaches the preset lower limit. When the pressure sensor 14 detects the pressure difference between the supply and return water pipes, it transmits the pressure difference signal to the PID control module. The PID control module adjusts the opening of the proportional regulating valve 11 according to the pressure difference signal and receives its feedback signal. If the pressure difference increases, the regulating valve opens more; otherwise, the regulating valve closes less, so as to maintain a constant flow rate in the supply and return water pipes.

[0034] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A multi-mode control system for a composite cold and heat source, characterized in that, This includes ground source heat pump systems, air source heat pump systems, and DDC control systems; The ground source heat pump system includes a ground source heat pump host (1), a buried water pipe (3), a ground source heat pump host switch valve (4), multiple ground source side water pumps (5), a user side water pump (6), and an indoor energy system (15). The water inlet of the ground source heat pump host (1) is connected to the buried water pipe (3) through a pipeline, and the water outlet of the ground source heat pump host (1) is connected to the indoor energy system (15) through a pipeline. The multiple ground source side water pumps (5) are arranged in parallel on the water supply pipeline between the ground source heat pump host (1) and the buried water pipe (3). The user side water pump (6) is arranged on the water supply pipeline between the ground source heat pump host (1) and the indoor energy system (15). The ground source heat pump host switch valve (4) is arranged on the water inlet of the ground source heat pump host (1). The air source heat pump system includes an air source heat pump main unit (7), an air source heat pump main unit switch valve (8), and an air source water pump (9). The air source water pump (9) is installed on the water supply pipeline between the air source heat pump main unit (7) and the indoor energy system (15). The air source heat pump main unit switch valve (8) is installed at the water supply end of the air source heat pump main unit (7). The DDC control system includes a PID control module, an input module, and an output module. The output module is electrically connected to the ground source water pump (5), the user-side water pump (6), and the air source water pump (9) via a three-phase contactor. The output module is also electrically connected to the ground source heat pump main unit switch valve (4) and the air source heat pump main unit switch valve (8) via relays. The output module includes a timer, a trigger, and logic and command elements. The input module is connected to the output module through the output terminal of the trigger. The three-phase contactors and relays are electrically connected to their respective timers or logic and command elements.

2. The multi-mode control system for a composite cold and heat source according to claim 1, characterized in that, The ground source heat pump system also includes a second ground source heat pump host (2), the water inlet of the second ground source heat pump host (2) is connected to the buried water pipe (3) through a pipeline, and the water outlet of the second ground source heat pump host (2) is connected to the indoor energy system (15) through a pipeline.

3. The multi-mode control system for a composite cold and heat source according to claim 1, characterized in that, The ground source heat pump system and the air source heat pump are equipped with a switching valve group (10) on the water supply terminal pipe, and the switching valve group (10) is electrically connected to the DDC control system (16).

4. The multi-mode control system for a composite cold and heat source according to claim 1, characterized in that, A proportional regulating valve (11) electrically connected to the DDC control system (16) is installed between the water supply pipe and the return pipe of the indoor energy system (15).

5. A multi-mode control system for a composite cold and heat source according to claim 1, characterized in that, A pressure sensor (14) electrically connected to the DDC control system (16) is installed between the water supply pipe and the return pipe of the indoor energy system (15).

6. A multi-mode control system for a composite cold and heat source according to claim 1, characterized in that, A heat meter (12) is installed on the pipeline between the underground water pipe (3) and the ground source side water pump (5).

7. A multi-mode control system for a composite cold and heat source according to claim 1, characterized in that, A temperature sensor (13) is installed on the pipeline between the underground water pipe (3) and the ground source side water pump (5).

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