CN115031319B - A control method for water supply and air conditioning system using natural energy - Google Patents

Abstract

The invention discloses a water supply air conditioning system utilizing natural energy and a control method thereof, comprising a mechanical refrigeration and heating system, a phase-change energy storage system, a hot water supply system and an intelligent control system, wherein the mechanical refrigeration and heating system comprises a compressor, an outdoor unit, a thermal expansion valve, an indoor unit and a four-way electromagnetic reversing valve which are circularly connected, the phase-change energy storage system comprises an outdoor heat exchanger which performs heat exchange with a phase-change energy storage box, the phase-change energy storage box and the outdoor unit are connected in parallel on a circulating pipeline of the mechanical refrigeration and heating system, the hot water supply system performs circular heat exchange with a refrigerant of the mechanical refrigeration and heating system through a shell-and-tube heat exchanger, and the intelligent control system is connected with the mechanical refrigeration and heating system, the phase-change energy storage system and the hot water supply system. The invention greatly reduces the running energy consumption of the air conditioner, saves the electricity cost, improves the utilization rate of energy sources and the comfort of users, and simultaneously provides the domestic water with adjustable temperature.

Description

A control method for water supply and air conditioning system using natural energy

Technical field

The present invention relates to the technical field of air conditioning equipment, and in particular, to a control method for a water supply air conditioning system utilizing natural energy.

Background technique

With the rapid development of current science and technology and the continuous improvement of people's living standards, people's requirements for air conditioning automation and comfort are also constantly increasing. Existing air-conditioning equipment technology consumes a lot of energy during long-term mechanical refrigeration and heating processes, and cannot utilize natural working fluids, resulting in low energy efficiency, applicability and practicality; during long-term working processes of air-conditioning units, not only the The quality of refrigeration efficiency will be greatly reduced, and a large amount of heat energy will be lost to the air, and energy cannot be fully and rationally utilized. Therefore, air conditioning systems need to develop in a more environmentally friendly and energy-saving direction. Considering comfort, energy saving and environmental protection, the use of natural cold sources for refrigeration is currently the best choice for the development of air conditioning systems. It not only conforms to the current world development situation, but also enables full utilization and scale of natural cold sources. utilization.

The invention patent application with the application publication date of 2013.02.06 and the application publication number CN102914003A discloses a machine room air conditioning system that combines phase change energy storage with natural and artificial cold sources, including a phase change energy storage device, an outdoor air cooling device, Air conditioning chillers, indoor fan coils, circulating water pipes and intelligent expert control systems. The intelligent expert control system controls the time sharing of indoor fan coils with natural and artificial cold source equipment and phase change energy storage devices based on the set temperature of the computer room and the outdoor ambient temperature. Working together, they can effectively utilize natural cold sources.

Compared with traditional air conditioning equipment, the computer room air conditioning system of the above-mentioned invention patent application technical solution has certain technical effects under specific conditions. However, there are the following technical problems: (1) The air-conditioning chiller can only be used for cooling. In the refrigeration and heating cycles of the air-conditioning chiller, only the obtained cooling capacity can be used, and the heat generated is released to the surrounding environment again. The system energy efficiency Low; (2) The air-conditioning chiller is used to transport cold energy to the indoor fan, which increases the intermediate heat exchange link. The cold energy produced by the air-conditioning unit needs to be heat exchanged with the circulating water first, and then the circulating water needs to be heated again with the fan. exchange, the energy utilization rate is low; (3) In addition to the air conditioning chiller, it is also necessary to equip an outdoor air cooling device. When the outdoor temperature is lower than the indoor temperature, the outdoor air cooling device works alone and can only meet the cooling needs of the high-temperature computer room. There is no application requirement in ordinary residential or office buildings.

Contents of the invention

In view of the deficiencies in the above background technology, the present invention proposes a control method for a water supply air conditioning system using natural energy, which solves the problem of low energy efficiency and small scope of application of air conditioning systems using natural cold sources, phase change energy storage and mechanical cold sources. question.

The technical solution of this application is:

A control method for a water supply air conditioning system utilizing natural energy. The water supply air conditioning system utilizing natural energy includes a mechanical refrigeration and heating system, a phase change energy storage system, a hot water supply system, and an intelligent control system. The mechanical refrigeration and heating system includes A compressor, an outdoor unit, a thermal expansion valve, an indoor unit, and a four-way electromagnetic reversing valve are connected cyclically. The phase change energy storage system includes an outdoor heat exchanger that exchanges heat with the phase change energy storage tank. The energy storage box and the outdoor unit are connected in parallel on the circulation pipeline of the mechanical refrigeration and heating system. The hot water supply system performs cyclic heat exchange with the refrigerant of the mechanical refrigeration and heating system through a shell-and-tube heat exchanger. The intelligent control system Connected to mechanical refrigeration and heating systems, phase change energy storage systems, and hot water supply systems.

Further, the refrigerant inlet pipe of the shell and tube heat exchanger is connected to the refrigerant pipe between the compressor and the four-way electromagnetic reversing valve, and the refrigerant outlet pipe of the shell and tube heat exchanger includes a parallel connection. A first refrigerant outlet pipe and a second refrigerant outlet pipe are provided, the first refrigerant outlet pipe is connected to the refrigerant pipe between the indoor unit and the four-way electromagnetic reversing valve, and the second refrigerant outlet pipe is connected to the thermal On the refrigerant pipeline between the expansion valve and the outdoor unit.

Further, the first refrigerant outlet pipe is provided with a first solenoid valve, the second refrigerant outlet pipe is provided with a second solenoid valve, and the intelligent control system is connected with the first solenoid valve and the second solenoid valve. connected.

Further, the water inlet of the shell-and-tube heat exchanger is connected to a tap water inlet pipe, the water outlet of the shell-and-tube heat exchanger is connected to a domestic water outlet pipe, and the domestic water outlet pipe is connected to a domestic water collection tank. The domestic water collection tank is connected to a water level gauge and a domestic water temperature sensor, the tap water inlet pipe is connected to a third solenoid valve, and the intelligent control system is connected to the water level gauge, the domestic water temperature sensor, and the third solenoid valve.

Furthermore, the outdoor heat exchanger is provided with an outdoor ambient temperature sensor, and the outdoor heat exchanger and the phase change energy storage box are cyclically connected through a heat exchange pipeline. The heat exchange medium in the heat exchange pipeline passes through a frequency conversion system. Pump drive, the intelligent control system is connected to the outdoor ambient temperature sensor and frequency conversion pump.

Further, a fourth solenoid valve is provided on the refrigerant circulation pipeline connected between the phase change energy storage box and the mechanical refrigeration and heating system, and the intelligent control system is connected to the fourth solenoid valve.

Further, the outdoor heat exchanger is a tube-fin heat exchanger, the phase change material in the phase change energy storage box is a liquid phase change material, and a refrigerant circulation pipe is provided in the phase change energy storage box. Coil heat exchanger connected by a circuit.

The control method includes: the intelligent control system sets the outdoor summer temperature T1 and the outdoor winter temperature T2; the control method includes natural energy heat exchange control: the intelligent control system detects the outdoor environment temperature through an outdoor environment temperature sensor. When the outdoor ambient temperature detected by the outdoor ambient temperature sensor is lower than the outdoor summer temperature T1, the intelligent control system controls the tube-fin heat exchanger to start the cold storage function, starts the variable frequency pump, opens the fourth solenoid valve, and cooperates with the outdoor unit in the refrigeration control process. function to further reduce the refrigerant temperature; when the outdoor ambient temperature detected by the outdoor ambient temperature sensor is higher than the outdoor winter temperature T2, the intelligent control system controls the tube-fin heat exchanger to start the heat storage function, start the variable frequency pump, and open the fourth solenoid valve , working together with the outdoor unit to further increase the refrigerant temperature.

Further, the control method also includes refrigeration control and heating control; the refrigeration control: the intelligent control system controls the mechanical refrigeration and heating system to start the refrigeration cycle, and the indoor unit of the mechanical refrigeration and heating system absorbs heat indoors and cools the outdoor unit. Dissipate heat to the outside. At the same time, the intelligent control system controls the second solenoid valve to open and the first solenoid valve to close. Part of the high-temperature and high-pressure refrigerant output by the compressor enters the shell-and-tube heat exchanger through the refrigerant inlet pipe and heats the shell-and-tube heat exchanger. Domestic water in the heater, high-temperature and high-pressure refrigerant heats the domestic water and is discharged from the refrigerant outlet pipe. After being discharged from the outdoor unit, the refrigerant enters the compressor again through the four-way electromagnetic reversing valve and enters the next cycle;

The heating control: the intelligent control system controls the mechanical refrigeration and heating system to start the heating cycle. The indoor unit of the mechanical refrigeration and heating system releases heat indoors and the outdoor unit absorbs heat outdoors. At the same time, the intelligent control system controls the first solenoid valve. When the second solenoid valve is opened and the second solenoid valve is closed, part of the high-temperature and high-pressure refrigerant output by the compressor enters the shell-and-tube heat exchanger through the refrigerant inlet pipe to heat the domestic water in the shell-and-tube heat exchanger. The high-temperature and high-pressure refrigerant heats the domestic water. After the water is used, it is discharged from the refrigerant outlet pipe. After the refrigerant is discharged, it enters the indoor unit through the first solenoid valve to release heat and heat the room. After the refrigerant is discharged from the indoor unit, it passes through the thermal expansion valve and becomes a low-temperature and low-pressure state. Low-temperature and low-pressure refrigeration The refrigerant enters the outdoor unit to absorb heat. After being discharged from the outdoor unit, the refrigerant enters the compressor again through the four-way electromagnetic reversing valve and enters the next cycle.

Further, the control method also includes hot water supply control. The intelligent control system sets the domestic water temperature T3. The intelligent control system detects the domestic water temperature through the domestic water temperature sensor. When the domestic water temperature detected by the domestic water temperature sensor When the temperature is lower than the domestic water temperature T3, the intelligent control system controls the first solenoid valve or the second solenoid valve to automatically open; when the domestic water temperature detected by the domestic water temperature sensor is higher than the domestic water temperature T3, the intelligent control system controls the first solenoid valve. The opening of the valve or the second solenoid valve gradually decreases until it closes; the intelligent control system sets the water level threshold. When the water level meter detects that the water level in the domestic water collection tank exceeds the water level threshold, the intelligent control system controls the third solenoid valve. Automatically close; when the water level gauge detects that the water level in the domestic water collection tank is lower than the water level threshold, the intelligent control system controls the third solenoid valve to automatically open. The intelligent control system sets the domestic water temperature T3 to be adjustable. The user can set different domestic water temperatures T3 according to the usage requirements. Correspondingly, the intelligent control system controls the first solenoid valve according to the temperature value detected by the domestic water temperature sensor. Or the second solenoid valve opens and closes or opens to achieve different domestic water temperatures.

Compared with the existing technology, the beneficial effects of the present invention include:

The invention provides a water supply air conditioning system and a control method that utilize natural energy. It utilizes phase change energy storage technology and natural energy refrigeration and heating technology to combine the traditional mechanical refrigeration and heating system, phase change energy storage system, hot water supply system, Intelligent control system integration integrates the utilization of natural energy and hot water supply system into the air conditioning system, which can continuously provide energy for the refrigeration, heating and water supply systems of household air conditioners to achieve tri-generation and meet the needs of refrigeration, heating and water. , and at the same time, the operating load can be controlled according to the settings of the intelligent control system to meet the use under various conditions and scenarios. The invention not only fully and rationally utilizes the natural energy in the external environment, but also fully utilizes the energy generated by the operation of the air conditioning system, avoiding the waste of energy; through the intelligent control system, the energy consumption of the air conditioning operation is greatly reduced and savings are achieved. The electricity cost improves energy utilization and user comfort, while providing temperature-adjustable domestic water.

Description of the drawings

In order to explain the embodiments of the present invention more clearly, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary people in the art, For technical personnel, other drawings can also be obtained based on these drawings without exerting creative work.

Figure 1 is a schematic diagram of the principle of the present invention;

Figure 2 is a partially enlarged schematic diagram of the phase change energy storage system of the present invention;

Figure 3 is a partially enlarged schematic diagram of the hot water supply system of the present invention;

Figure 4 is a functional block diagram of the present invention;

Figure 5 is a functional block diagram of the intelligent control system of the present invention;

Numbers in the picture:

21. Mechanical refrigeration and heating system:

1. Thermal expansion valve;

5. Compressor;

6. Indoor unit;

7. Outdoor unit;

8. Four-way solenoid directional valve;

22. Phase change energy storage system:

2. The fourth solenoid valve;

9. Outdoor heat exchanger;

10. Frequency conversion pump;

11. Phase change energy storage box;

23. Hot water supply unit:

3. The second solenoid valve;

4. The first solenoid valve;

15. Domestic water valves;

19. The third solenoid valve;

13. Shell and tube heat exchanger;

16. Domestic water collection tank;

17. Tap water inlet pipe;

18. Domestic water outlet pipes;

24. Intelligent control system:

12. Outdoor ambient temperature sensor;

14. Domestic water temperature sensor;

20. Water level gauge.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without exerting creative efforts fall within the scope of protection of the present invention.

A water supply and air conditioning system using natural energy, as shown in Figure 1, includes a mechanical refrigeration and heating system 21, a phase change energy storage system 22, a hot water supply system 23, and an intelligent control system 24. The mechanical refrigeration and heating system 21 is an ordinary air conditioning system, which can be used for both indoor cooling and indoor heating; the phase change energy storage system 22 obtains cold sources or heat sources from the outdoor air environment, and is used for The auxiliary mechanical refrigeration and heating system 21 is used for further heat exchange during cooling or heating; the hot water supply system 23 obtains unusable cold energy or heat from the mechanical refrigeration and heating system 21, thereby generating a higher temperature living environment. Water; the intelligent control system 24 is connected to the mechanical refrigeration and heating system 21, the phase change energy storage system 22, and the hot water supply system 23. The intelligent control system 24 is based on the needs of refrigeration and heating, as well as the outdoor ambient temperature and hot water demand. temperature to control the coordinated operation of each system to achieve more system efficient and energy-saving effects.

Specifically, the mechanical refrigeration and heating system 21 includes a cyclically connected compressor 5, an outdoor unit 7, a thermal expansion valve 1, an indoor unit 6, and a four-way electromagnetic reversing valve 8. The outdoor unit 7 is used to discharge air from the outdoor environment. Heat or heat absorption, the indoor unit 6 is used to provide cooling or heating indoors. The phase change energy storage system 22 includes an outdoor heat exchanger 9 that performs heat exchange with the phase change energy storage box 11. The outdoor heat exchanger 9 obtains cold energy or heat from the outdoor environment, and then stores the obtained energy in the phase change energy storage box 11. In the energy storage box 11; the phase change energy storage box 11 and the outdoor unit 7 are connected in parallel on the circulation pipeline of the mechanical refrigeration and heating system 21, then the cold energy or heat in the phase change energy storage box 11 can be used for mechanical refrigeration and heating. The cooling or heating cycle of the system 21 assists the outdoor unit 7 in dissipating or absorbing heat. The hot water supply system 23 performs cyclic heat exchange with the refrigerant of the mechanical refrigeration and heating system 21 through the shell-and-tube heat exchanger 13. The domestic water in the shell-and-tube heat exchanger 13 and the high temperature of the mechanical refrigeration and heating system 21 The refrigerant exchanges heat to obtain higher temperature domestic water.

Based on the above embodiments, as a preferred implementation, as shown in Figures 1-3, the refrigerant inlet pipe of the shell and tube heat exchanger 13 is connected between the compressor 5 and the four-way electromagnetic commutation On the refrigerant pipeline between the valves 8, the high-temperature and high-pressure refrigerant discharged from the compressor 5 can directly enter the shell-and-tube heat exchanger 13 through the refrigerant inlet pipe, and then conduct heat exchange with the domestic water therein. The refrigerant outlet pipe of the shell and tube heat exchanger 13 includes a first refrigerant outlet pipe and a second refrigerant outlet pipe arranged in parallel. Through the use of two different refrigerant outlet pipes, mechanical refrigeration and heating can be achieved. Both the refrigeration cycle and the heating cycle of the system 21 can obtain corresponding heat, which is used to produce higher-temperature domestic water.

Specifically, if the first refrigerant outlet pipe is connected to the refrigerant pipeline between the indoor unit 6 and the four-way electromagnetic reversing valve 8, the hot water supply system 23 can not only use the high-temperature and high-pressure refrigerant discharged from the compressor 5 to increase the water temperature, and in the heating cycle of the mechanical refrigeration and heating system 21, a part of the high-temperature and high-pressure refrigerant can pass through the shell-and-tube heat exchanger 13 and then enter the indoor unit 6, so that the heat energy generated by the compressor 5 can be fully utilized. , and can prevent the indoor heating from heating up too quickly and causing adverse effects on the indoor unit 6. At the same time, it can also avoid local overheating of the indoor environment and causing discomfort.

The second refrigerant outlet pipe is connected to the refrigerant pipe between the thermal expansion valve 1 and the outdoor unit 7, so the hot water supply system 23 can not only use the high-temperature and high-pressure refrigerant discharged from the compressor 5 to increase the water temperature, but also In the refrigeration cycle of the mechanical refrigeration and heating system 21, part of the high-temperature and high-pressure refrigerant can bypass the outdoor unit 7 and enter the shell-and-tube heat exchanger 13, which can not only make full use of the heat energy generated by the compressor 5, but also reduce the cost of the outdoor unit. 7 heat exchange capacity.

Based on the above embodiments, as a preferred implementation, a first solenoid valve 4 is provided on the first refrigerant outlet pipe, and a second solenoid valve 3 is provided on the second refrigerant outlet pipe. The intelligent control system 24 is connected to the first solenoid valve 4 and the second solenoid valve 3. The intelligent control system 24 can automatically adjust the circulation loop of the hot water supply system 23 according to the cooling and heating status of the mechanical refrigeration and heating system 21. .

On the basis of the above embodiments, as a preferred implementation, the water inlet of the shell and tube heat exchanger 13 is connected to the tap water inlet pipe 17, and the water outlet of the shell and tube heat exchanger 13 is connected to domestic water. Outlet pipe 18. The domestic water outlet pipe 18 is connected to a domestic water collection tank 16 , and the domestic water collection tank 16 is connected to a domestic water valve 15 , a water level gauge 20 and a domestic water temperature sensor 14 . The tap water inlet pipe 17 is connected to a third solenoid valve 19 , and the intelligent control system 24 is connected to a water level meter 20 , a domestic water temperature sensor 14 , and the third solenoid valve 19 . The intelligent control system 24 can automatically control the opening and closing of the third solenoid valve 19 and the opening of the second solenoid valve 3 or the first solenoid valve 4 through the domestic water temperature sensor 14, thereby adjusting the water volume and water temperature.

Based on the above embodiments, as a preferred implementation, the outdoor heat exchanger 9 is provided with an outdoor ambient temperature sensor 12, and a heat exchange tube is used between the outdoor heat exchanger 9 and the phase change energy storage tank 11. The heat exchange medium in the heat exchange pipeline is driven by the variable frequency pump 10, and the intelligent control system 24 is connected to the outdoor ambient temperature sensor 12 and the variable frequency pump 10. The intelligent control system 24 can control the opening and closing and operating power of the outdoor heat exchanger 9 and the variable frequency pump 10 through the outdoor ambient temperature sensor 12 and the heating or cooling status of the mechanical refrigeration and heating system 21 .

Furthermore, a fourth solenoid valve 2 is provided on the refrigerant circulation pipeline connecting the phase change energy storage box 11 and the mechanical refrigeration and heating system 21 , and the intelligent control system is connected to the fourth solenoid valve 2 . The intelligent control system 24 can close the fourth solenoid valve 2 or reduce its opening when the outdoor ambient temperature is insufficient to provide appropriate cooling or heat, so that the cooling or heat in the phase change energy storage box 11 does not participate or participates in a small amount in the mechanical The refrigeration or heating cycle of the refrigeration and heating system 21 only controls the operation of the outdoor heat exchanger 9 and the variable frequency pump 10. When the energy in the phase change energy storage box 11 is sufficient, the fourth solenoid valve 2 is opened or its opening is increased. .

Based on the above embodiments, as a preferred implementation, the outdoor heat exchanger 9 is a tube-fin heat exchanger, and the phase change material in the phase change energy storage box 11 is a liquid phase change material. The phase change energy storage box 11 is provided with a coil heat exchanger connected to the refrigerant circulation pipeline. The phase change energy storage box 11 is equipped with a coil heat exchanger made of copper material and does not undergo phase change. It only needs to use the latent heat of phase change to ensure a good heat exchange effect.

A control method for a water supply air conditioning system utilizing natural energy, including the water supply air conditioning system utilizing natural energy. The intelligent control system 24 sets the outdoor summer temperature T1 and the outdoor winter temperature T2. As a preferred embodiment, the T1 is set to 25°C, and the T2 set temperature is -5°C; the control method includes natural energy heat exchange control: the intelligent control system 24 detects the outdoor ambient temperature through the outdoor ambient temperature sensor 12. When the outdoor ambient temperature When the outdoor ambient temperature detected by the sensor 12 is lower than the outdoor summer temperature T1, the intelligent control system 24 controls the tube-fin heat exchanger to start the cold storage function, starts the variable frequency pump 10, opens the fourth solenoid valve 2, and communicates with the outdoor unit during the refrigeration control process. 7 work together to further reduce the refrigerant temperature; when the outdoor ambient temperature detected by the outdoor ambient temperature sensor 12 is higher than the outdoor winter temperature T2, the intelligent control system 24 controls the tube-fin heat exchanger to start the heat storage function and starts the variable frequency pump 10. Open the fourth solenoid valve 2 and work together with the outdoor unit 7 to further increase the refrigerant temperature.

Further, the control method also includes refrigeration control and heating control; the refrigeration control: the intelligent control system 24 controls the mechanical refrigeration and heating system 21 to start the refrigeration cycle, and the indoor unit 6 of the mechanical refrigeration and heating system 21 absorbs heat indoors. The refrigeration and outdoor unit 7 dissipates heat to the outside. At the same time, the intelligent control system 24 controls the second solenoid valve 3 to open and the first solenoid valve 4 to close. Part of the high-temperature and high-pressure refrigerant output by the compressor 5 enters the shell-and-tube type through the refrigerant inlet pipe. The heat exchanger 13 heats the domestic water in the shell-and-tube heat exchanger 13. The high-temperature and high-pressure refrigerant heats the domestic water and is discharged from the refrigerant outlet pipe. The refrigerant is discharged from the outdoor unit 7 and passes through the four-way electromagnetic reversing valve 8. Enter compressor 5 again and enter the next cycle;

Described heating control: the intelligent control system 24 controls the mechanical refrigeration and heating system 21 to start the heating cycle. The indoor unit 6 of the mechanical refrigeration and heating system 21 releases heat indoors and the outdoor unit 7 absorbs heat outdoors. At the same time, the intelligent control system 24 controls the opening of the first solenoid valve 4 and the closing of the second solenoid valve 3. Part of the high-temperature and high-pressure refrigerant output by the compressor 5 enters the shell-and-tube heat exchanger 13 through the refrigerant inlet pipe to heat the shell-and-tube heat exchanger 13. Domestic water, high-temperature and high-pressure refrigerant heats the domestic water and is discharged from the refrigerant outlet pipe. After the refrigerant is discharged, it enters the indoor unit 6 through the first solenoid valve 4 to release heat and heat the room. After the refrigerant is discharged from the indoor unit 6 It changes to a low-temperature and low-pressure state through the thermal expansion valve 1. The low-temperature and low-pressure refrigerant enters the outdoor unit 7 to absorb heat. After being discharged from the outdoor unit 7, the refrigerant passes through the four-way electromagnetic reversing valve 8 and enters the compressor 5 again before entering the next cycle. .

Further, the control method also includes hot water supply control. The intelligent control system 24 sets the domestic water temperature T3. The intelligent control system 24 detects the domestic water temperature through the domestic water temperature sensor 14. When the domestic water temperature sensor 14 When the detected domestic water temperature is lower than the domestic water temperature T3, the intelligent control system 24 controls the first solenoid valve 4 or the second solenoid valve 3 to automatically open; when the domestic water temperature detected by the domestic water temperature sensor 14 is higher than the domestic water temperature T3 , the intelligent control system 24 controls the opening of the first solenoid valve 4 or the second solenoid valve 3 to gradually decrease until it closes; the intelligent control system 24 sets the water level threshold, when the water level meter 20 detects the water level in the domestic water collection tank 16 After the height exceeds the water level threshold, the intelligent control system 24 controls the third solenoid valve 19 to automatically close; when the water level meter 20 detects that the water level in the domestic water collection tank 16 is lower than the water level threshold, the intelligent control system 24 controls the third solenoid valve 19 automatically open.

Furthermore, the intelligent control system 24 sets the domestic water temperature T3 to be adjustable, and the user can set different domestic water temperatures T3 according to usage requirements. Correspondingly, the intelligent control system 24 adjusts the temperature according to the temperature value detected by the domestic water temperature sensor 14 , control the opening and closing or opening of the first solenoid valve 4 or the second solenoid valve 3, thereby achieving different domestic water temperatures.

The non-exhaustive aspects of the present invention are all conventional technical means known to those skilled in the art.

The above content shows and describes the basic principles, main features and beneficial effects of the present invention. The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (1)

1. A control method of a water supply air conditioning system utilizing natural energy is characterized in that: the water supply air conditioning system utilizing natural energy comprises a mechanical refrigeration heating system (21), a phase-change energy storage system (22), a hot water supply system (23) and an intelligent control system (24), wherein the mechanical refrigeration heating system (21) comprises a compressor (5), an outdoor unit (7), a thermal expansion valve (1), an indoor unit (6) and a four-way electromagnetic reversing valve (8) which are circularly connected, the phase-change energy storage system (22) comprises an outdoor heat exchanger (9) which exchanges heat with a phase-change energy storage box (11), the phase-change energy storage box (11) and the outdoor unit (7) are connected in parallel on a circulating pipeline of the mechanical refrigeration heating system (21), the hot water supply system (23) exchanges heat circularly with a refrigerant of the mechanical refrigeration heating system (21) through a shell-and-tube heat exchanger (13), and the intelligent control system (24) is connected with the mechanical refrigeration heating system (21), the phase-change energy storage system (22) and the hot water supply system (23);

the refrigerant inlet pipeline of the shell-and-tube heat exchanger (13) is connected to a refrigerant pipeline between the compressor (5) and the four-way electromagnetic reversing valve (8), the refrigerant outlet pipeline of the shell-and-tube heat exchanger (13) comprises a first refrigerant outlet pipeline and a second refrigerant outlet pipeline which are arranged in parallel, the first refrigerant outlet pipeline is connected to the refrigerant pipeline between the indoor unit (6) and the four-way electromagnetic reversing valve (8), and the second refrigerant outlet pipeline is connected to the refrigerant pipeline between the thermal expansion valve (1) and the outdoor unit (7);

the intelligent control system comprises a first refrigerant outlet pipeline, a second refrigerant outlet pipeline, an intelligent control system (24) and a first electromagnetic valve (4), wherein the first electromagnetic valve (3) is arranged on the first refrigerant outlet pipeline, the second electromagnetic valve (3) is arranged on the second refrigerant outlet pipeline, and the intelligent control system (24) is connected with the first electromagnetic valve (4) and the second electromagnetic valve (3);

the intelligent control system comprises a shell-and-tube heat exchanger (13), a tap water inlet pipeline (17), a domestic water outlet pipeline (18), a domestic water collecting tank (16), a water level meter (20) and a domestic water temperature sensor (14), a third electromagnetic valve (19) and an intelligent control system (24), wherein the tap water inlet pipeline (17) is connected with the water level meter (20), the domestic water temperature sensor (14) and the third electromagnetic valve (19);

an outdoor environment temperature sensor (12) is arranged on the outdoor heat exchanger (9), the outdoor heat exchanger (9) is circularly connected with the phase change energy storage box (11) through a heat exchange pipeline, a heat exchange medium in the heat exchange pipeline is driven by a variable frequency pump (10), and the intelligent control system (24) is connected with the outdoor environment temperature sensor (12) and the variable frequency pump (10);

a fourth electromagnetic valve (2) is arranged on a refrigerant circulation pipeline connected with the mechanical refrigeration and heating system (21) through the phase change energy storage box (11), and the intelligent control system is connected with the fourth electromagnetic valve (2);

the outdoor heat exchanger (9) is a tube-fin heat exchanger, the phase-change material in the phase-change energy storage tank (11) is a liquid phase-change material, and a coiled heat exchanger connected with a refrigerant circulation pipeline is arranged in the phase-change energy storage tank (11);

the control method comprises the following steps: the intelligent control system (24) sets an outdoor summer temperature T1 and an outdoor winter temperature T2; the control method comprises the following steps of natural energy heat exchange control: the intelligent control system (24) detects outdoor environment temperature through the outdoor environment temperature sensor (12), when the outdoor environment temperature detected by the outdoor environment temperature sensor (12) is lower than outdoor summer temperature T1, the intelligent control system (24) controls the tube-fin heat exchanger to start a cold accumulation function, starts the variable frequency pump (10), opens the fourth electromagnetic valve (2) and acts together with an outdoor unit (7) in the refrigeration control process, so that the temperature of the refrigerant is further reduced; when the outdoor environment temperature detected by the outdoor environment temperature sensor (12) is higher than the outdoor winter temperature T2, the intelligent control system (24) controls the tube-fin heat exchanger to start a heat storage function, the variable frequency pump (10) is started, the fourth electromagnetic valve (2) is opened, and the variable frequency pump and the outdoor unit (7) act together to further increase the temperature of the refrigerant;

the control method also comprises refrigeration control and heating control;

the refrigeration control: the intelligent control system (24) controls the mechanical refrigeration and heating system (21) to start a refrigeration cycle, an indoor unit (6) of the mechanical refrigeration and heating system (21) absorbs heat and cools indoors and an outdoor unit (7) dissipates heat outdoors, meanwhile, the intelligent control system (24) controls a second electromagnetic valve (3) to be opened and a first electromagnetic valve (4) to be closed, part of high-temperature and high-pressure refrigerant output by the compressor (5) enters the shell-and-tube heat exchanger (13) through a refrigerant inlet pipeline and heats domestic water in the shell-and-tube heat exchanger (13), the high-temperature and high-pressure refrigerant heats the domestic water and then is discharged from a refrigerant outlet pipeline, and the refrigerant enters the compressor (5) again through a four-way electromagnetic reversing valve (8) after being discharged from the outdoor unit (7) and then enters the next cycle;

the heating control comprises the following steps: the intelligent control system (24) controls the mechanical refrigeration and heating system (21) to start a heating cycle, an indoor unit (6) of the mechanical refrigeration and heating system (21) releases heat indoors and an outdoor unit (7) absorbs heat outdoors, meanwhile, the intelligent control system (24) controls a first electromagnetic valve (4) to be opened and a second electromagnetic valve (3) to be closed, part of high-temperature and high-pressure refrigerant output by the compressor (5) enters the shell-and-tube heat exchanger (13) through a refrigerant inlet pipeline and heats domestic water in the shell-and-tube heat exchanger (13), the high-temperature and high-pressure refrigerant heats the domestic water and is discharged from a refrigerant outlet pipeline, the refrigerant enters the indoor unit (6) through the first electromagnetic valve (4) after being discharged, the indoor unit releases heat and heats indoors, the refrigerant is discharged from the indoor unit (6) and then enters the outdoor unit (7) to absorb heat, the refrigerant enters the four-way electromagnetic valve (8) after being discharged from the outdoor unit (7) and then enters the next cycle;

the control method further comprises hot water supply control, wherein the intelligent control system (24) sets the domestic water temperature T3, the intelligent control system (24) detects the domestic water temperature through the domestic water temperature sensor (14), and when the domestic water temperature detected by the domestic water temperature sensor (14) is lower than the domestic water temperature T3, the intelligent control system (24) controls the first electromagnetic valve (4) or the second electromagnetic valve (3) to be automatically opened; when the domestic water temperature detected by the domestic water temperature sensor (14) is higher than the domestic water temperature T3, the intelligent control system (24) controls the opening of the first electromagnetic valve (4) or the second electromagnetic valve (3) to be gradually reduced until the opening is closed; the intelligent control system (24) sets a water level threshold, and when the water level gauge (20) detects that the water level in the domestic water collecting tank (16) exceeds the water level threshold, the intelligent control system (24) controls the third electromagnetic valve (19) to be automatically closed; when the water level gauge (20) detects that the water level in the domestic water collecting tank (16) is lower than the water level threshold value, the intelligent control system (24) controls the third electromagnetic valve (19) to be automatically opened; the domestic water temperature T3 that intelligent control system (24) set for is adjustable, sets for different domestic water temperatures T3 through intelligent control system (24) according to the user demand, and intelligent control system (24) is according to the temperature numerical value that domestic water temperature sensor (14) detected, controls first solenoid valve (4) or second solenoid valve (3) and opens and close or the aperture, and then reaches different domestic water temperatures.