Combined system suitable for heating and refrigerating of rural building

Abstract

The invention relates to the technical field of multi-energy complementation, in particular to a heating and refrigerating combined system suitable for rural buildings. The system comprises a first water supply subsystem, a second water supply subsystem, a solar subsystem, a first air energy subsystem and a second air energy subsystem. The first water supply subsystem and the second water supply subsystem respectively comprise an energy storage water tank and a living water tank; the solar subsystem comprises a solar heat collection pipe set, a solar heat conduction oil pipeline and a solar heat conduction oil circulating pump and is used for carrying out indirect heat exchange with water in the living water tank and / or the energy storage water tank through a heat conduction oil medium. The first air energy subsystem comprises an air energy unit and an air energy circulating water pump and is used for cooling or heating water in the energy storage water tank; the second air energy subsystem comprises an air energy water heater, a heat compensation circulating pump and a heat compensation pipeline and is used for conducting auxiliary heating on the living water tank or the energy storage water tank. According to the invention, life demands under extreme climate conditions are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of multi - energy complementation, and particularly relates to a combined system adapted to heating and cooling of rural buildings. Background Art

[0002] In terms of building cooling and heating, the utilization forms in vast rural areas are relatively simple. Commonly, solar water heaters are used to meet the demand for domestic hot water, air conditioners are used to meet the cooling demand in summer, and coal, wood, etc. are burned to meet the heating demand in winter. Therefore, not only improvement is needed in terms of environmental protection and energy conservation, but also due to the single - way energy utilization mode, the demand guarantee is poor, and the basic living needs cannot be met under extreme climate conditions. Summary of the Invention

[0003] In order to solve the above problems in the prior art, the present invention proposes a combined system adapted to heating and cooling of rural buildings, which not only realizes environmental protection and energy conservation, but also guarantees the living needs under extreme climate conditions.

[0004] The present invention provides a combined system adapted to heating and cooling of rural buildings, and the system includes: a first water supply subsystem, a second water supply subsystem, a solar energy subsystem, a first air - energy subsystem, and a second air - energy subsystem; The first water supply subsystem and the second water supply subsystem each include: a storage water tank and a domestic water tank; The solar energy subsystem includes: a solar heat collector group, a solar heat transfer oil pipeline, and a solar heat transfer oil circulation pump; The solar heat collector group is used to absorb solar energy and heat the heat transfer oil medium; The solar heat transfer oil pipeline is used to connect the solar heat collector group, the solar heat transfer oil circulation pump, the heat exchanger in the domestic water tank, and the heat exchanger in the storage water tank; The solar heat transfer oil circulation pump is used to drive the heat transfer oil medium to flow in the solar heat transfer oil pipeline, so that the heat transfer oil medium indirectly exchanges heat with the water in the domestic water tank and / or the storage water tank; The first air - energy subsystem includes: an air - energy unit and an air - energy circulation water pump; The air - energy unit uses air thermal energy to cool or heat water; The air - energy circulation water pump is used to drive the water in the storage water tank to flow through the air - energy unit for cooling or heating; The second air - energy subsystem includes: an air - energy water heater, a heat - supplementing circulation pump, and a heat - supplementing pipeline; The heat - supplementing pipeline is used to connect the air - energy water heater, the heat - supplementing circulation pump, the domestic water tank, and the storage water tank; The supplementary heat circulation pump is used to drive the water flow in the domestic water tank or the energy storage tank to enter the air source heat pump through the supplementary heat pipeline for heating, so as to realize the auxiliary heating of the domestic water tank or the energy storage tank.

[0005] Preferably, the first water supply subsystem further includes: an energy storage tank temperature sensor; The second water supply subsystem further includes: a domestic water tank temperature sensor; The energy storage tank temperature sensor and the domestic water tank temperature sensor are respectively used to monitor the water temperature in the energy storage tank and the domestic water tank; The system further includes: a field data acquisition control cabinet; The field data acquisition control cabinet is used to collect the monitored temperatures of the energy storage tank temperature sensor and the domestic water tank temperature sensor, and control the solar energy subsystem, the air source energy first subsystem and the air source energy second subsystem according to preset rules, so as to realize the temperature regulation of domestic water and cooling / heating water.

[0006] Preferably, the solar energy subsystem further includes: a domestic water tank heat transfer oil control valve and an energy storage tank heat transfer oil control valve; The first branch of the solar heat transfer oil pipeline is connected to the heat exchanger in the domestic water tank through the domestic water tank heat transfer oil control valve; The second branch of the solar heat transfer oil pipeline is connected to the heat exchanger in the energy storage tank through the energy storage tank heat transfer oil control valve; The domestic water tank heat transfer oil control valve is used to open or close the indirect heat exchange between the heat transfer oil medium and the water in the domestic water tank; The energy storage tank heat transfer oil control valve is used to open or close the indirect heat exchange between the heat transfer oil medium and the water in the energy storage tank.

[0007] Preferably, the air source energy second subsystem further includes: a first domestic water tank supplementary heat control valve and a second domestic water tank supplementary heat control valve, and a first energy storage tank supplementary heat control valve and a second energy storage tank supplementary heat control valve; The first branch of the supplementary heat pipeline is connected to the domestic water tank through the first domestic water tank supplementary heat control valve and the second domestic water tank supplementary heat control valve; The second branch of the supplementary heat pipeline is connected to the energy storage tank through the first energy storage tank supplementary heat control valve and the second energy storage tank supplementary heat control valve; The first domestic water tank supplementary heat control valve and the second domestic water tank supplementary heat control valve are respectively arranged at the inlet and outlet of the domestic water tank connecting the supplementary heat pipeline, and are used to open or close the auxiliary heating of the domestic water tank; The first heat supplement control valve of the energy storage water tank and the second heat supplement control valve of the energy storage water tank are respectively arranged at the inlet and outlet of the energy storage water tank connecting to the heat supplement pipeline, and are used to open or close the auxiliary heating of the energy storage water tank.

[0008] Preferably, the first water supply subsystem further includes: a first water supply pump; The second water supply subsystem further includes: a second water supply pump; The first water supply pump and the second water supply pump are respectively used to deliver the water in the energy storage water tank and the domestic water tank to the corresponding user terminals.

[0009] Preferably, the working modes of the on-site data acquisition control cabinet include: a summer working mode and a winter working mode; The preset rules include: In the summer working mode, open the heat-conducting oil control valve of the domestic water tank, close the heat-conducting oil control valve of the energy storage water tank, start the solar heat-conducting oil circulation pump to heat the domestic water tank to a first target temperature with the heat-conducting oil medium, and then close the solar heat-conducting oil circulation pump; start the air energy unit and the air energy circulation water pump to cool the water in the energy storage water tank to a second target temperature, and use the first water supply pump to send cold water to the indoor user terminal; In the winter working mode, open the heat-conducting oil control valve of the domestic water tank, close the heat-conducting oil control valve of the energy storage water tank, heat the domestic water tank to a third target temperature, then close the heat-conducting oil control valve of the domestic water tank, open the heat-conducting oil control valve of the energy storage water tank to preheat the energy storage water tank; start the air energy unit and the air energy circulation water pump to heat the water in the energy storage water tank to a fourth target temperature, and use the first water supply pump to send hot water to the indoor user terminal; Wherein, the values of the first target temperature, the second target temperature, the third target temperature and the fourth target temperature are set through the human-machine interaction interface of the on-site data acquisition control cabinet.

[0010] Preferably, the preset rules further include: In the summer working mode or the winter working mode, when the water in the domestic water tank cannot reach the third target temperature, open the first heat supplement control valve of the domestic water tank and the second heat supplement control valve of the domestic water tank, close the first heat supplement control valve of the energy storage water tank and the second heat supplement control valve of the energy storage water tank, and start the air energy water heater and the heat supplement circulation pump to perform auxiliary heating on the domestic water tank; In the winter working mode, when the water in the energy storage water tank cannot reach the fourth target temperature, close the first domestic water tank heat supplement control valve and the second domestic water tank heat supplement control valve, open the first energy storage water tank heat supplement control valve and the second energy storage water tank heat supplement control valve, and start the air source heat pump water heater and the heat supplement circulation pump to assist in heating the energy storage water tank.

[0011] Preferably, the solar energy subsystem further includes: a heat transfer oil overheat control valve; The heat transfer oil overheat control valve is arranged between the inlet and the outlet of the solar heat collector group, and is used to control the flow rate of the heat transfer oil medium entering the heat exchanger in the domestic water tank and the heat exchanger in the energy storage water tank, so as to avoid too high water temperature.

[0012] Preferably, the on-site data acquisition control cabinet executes control operations by using a time-space two-dimensional scheduling algorithm: In the time dimension, set the target temperatures of the domestic water tank and the energy storage water tank in different time periods, and set the enabling rules of the solar energy subsystem, the first air source energy subsystem and the second air source energy subsystem; In the space dimension, set the priorities of the domestic water tank and the energy storage water tank in different time periods, and set the enabling rules of the solar energy subsystem, the first air source energy subsystem and the second air source energy subsystem.

[0013] Preferably, the heat transfer oil medium is biphenyl-diphenyl ether eutectic heat transfer oil.

[0014] The present invention has the following beneficial effects: The system of the present invention mainly uses the solar energy subsystem to realize the basic guarantee of domestic hot water, and at the same time is supplemented by the second air source energy subsystem for heat supplement to meet the hot water demand under adverse environmental conditions, and improves the production efficiency through energy combination; for cooling / heating, the first air source energy subsystem is mainly used to meet the cooling and heating load requirements, and at the same time, the solar energy subsystem, the first air source energy subsystem and the second air source energy subsystem can be jointly used to heat the heating water under cold conditions. It not only realizes environmental protection and energy saving, but also guarantees the living needs under extreme climate conditions.

[0015] In summer, the solar energy subsystem heats the domestic water, and the first air source energy subsystem cools the cold water supply in the energy storage water tank, which are independent of each other and do not interfere with each other.

[0016] In winter, the solar energy subsystem, the first air energy subsystem, and the second air energy subsystem cooperate with each other. During the heating period, primary preheating is first carried out relying on solar energy, and then the temperature is raised to the required temperature through the air energy unit, achieving the high-performance heat production goal of cascade heat transfer. The "solar heat transfer oil + water dual-medium cascade heat transfer" technology is creatively applied, breaking through the limitation of the traditional single water medium of solar energy and greatly improving the heat transfer efficiency.

[0017] Use biphenyl-diphenyl ether eutectic heat transfer oil to replace water for the absorption, conversion, and transportation of solar energy, and use the high-temperature transfer method of indirect heat exchange to ensure the water quality, solve the problem of low-temperature antifreeze in winter, and adapt to the wide-range load fluctuations caused by environmental changes in rural buildings. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the main structure of an embodiment of the combined system for heating and cooling in rural buildings according to the present invention; Description of the reference numerals in the drawings: 1. Air energy unit, 2. Air energy circulating water pump, 3. Energy storage water tank, 4. Energy storage water tank temperature sensor, 5. First water supply pump, 6. Solar heat collecting tube group, 7. Solar heat transfer oil pipeline, 8. Heat transfer oil overheat control valve, 9. Solar heat transfer oil circulating pump, 10. Heat transfer oil control valve for the domestic water tank, 11. Heat transfer oil control valve for the energy storage water tank, 12. Domestic water tank, 13. Domestic water tank temperature sensor, 14. Second water supply pump, 15. Air energy water heater, 16. Supplementary heat circulating pump, 17-1. First domestic water tank supplementary heat control valve, 17-2. Second domestic water tank supplementary heat control valve, 18-1. First energy storage water tank supplementary heat control valve, 18-2. Second energy storage water tank supplementary heat control valve, 19. On-site data acquisition control cabinet, 20. Supplementary heat pipeline. Detailed Embodiments

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that in the description of the present invention, the terms "first" and "second" are only for convenience of description, rather than indicating or implying the relative importance of the devices, elements or parameters, and thus should not be construed as a limitation to the present invention. In addition, the term "and / or" in the present invention is only a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after, unless otherwise specified.

[0022] The present invention designs a new cascade mode combining solar energy and air energy. Not only does it adapt to the rural building environment with energy cascade application in terms of system form, but also it controls the equipment according to the operation data in system control to achieve the convenient use of solar energy and air energy with each other; when using solar energy, a biphenyl-diphenyl ether eutectic type heat transfer oil is selected, with a working temperature range of -50°C to 330°C, and both cold resistance and heat resistance are very wide. As a medium, it fully absorbs solar energy and transports the heat to the water in the water tank.

[0023] The system of the present invention breaks the single mode of energy supply practice in rural areas in the past, changes the heat transfer medium of the solar energy subsystem, and improves the heat collection efficiency of solar energy; taking advantage of the high efficiency of the air energy water heater to prepare hot water to ensure the temperature of the hot water. From the perspective of system safety, stability and high efficiency, it overcomes the deficiencies of domestic hot water and heating in the traditional mode under adverse conditions, helps to improve user satisfaction, and enhances the promotion and application value of this system. From the perspective of the use of clean energy, although solar energy has been widely used in rural areas in the past, most of them are mainly passive demands and cannot achieve effective active regulation. Introducing the air energy water heater completely avoids the previous deficiencies; at the same time, under the management of the on-site data acquisition control cabinet, during the user's heat demand period, the heat quality is gradually improved through the collaborative coupling of energy, the heat energy efficiency is improved, and the utilization rate of renewable energy is increased.

[0024] Figure 1 It is a main structural schematic diagram of an embodiment of the combined system for heating and cooling adapted to rural buildings in the present invention. The system of this embodiment includes: a first water supply subsystem, a second water supply subsystem, a solar energy subsystem, a first air energy subsystem, a second air energy subsystem, and an on-site data acquisition control cabinet (19).

[0025] In this embodiment, the first water supply subsystem includes: a storage water tank (3), a storage water tank temperature sensor (4), and a first water supply pump (5); the second water supply subsystem includes: a domestic water tank (12), a domestic water tank temperature sensor (13), and a second water supply pump (14).

[0026] The energy storage water tank temperature sensor (4) and the domestic water tank temperature sensor (13) are respectively used to monitor the water temperature in the energy storage water tank (3) and the domestic water tank (12); the first water supply pump (5) and the second water supply pump (14) are respectively used to deliver the water in the energy storage water tank (3) and the domestic water tank (12) to the corresponding user terminals.

[0027] In this embodiment, the solar energy subsystem includes: a solar heat collecting tube group (6), a solar heat-conducting oil pipeline (7), a solar heat-conducting oil circulation pump (9), a domestic water tank heat-conducting oil control valve (10), an energy storage water tank heat-conducting oil control valve (11), and a heat-conducting oil overheat control valve (8).

[0028] The solar heat collecting tube group (6) is used to absorb solar energy and heat the heat-conducting oil medium.

[0029] The solar heat-conducting oil pipeline (7) is used to connect the solar heat collecting tube group (6), the solar heat-conducting oil circulation pump (9), the heat exchanger in the domestic water tank (12), and the heat exchanger in the energy storage water tank (3). Among them, the first branch of the solar heat-conducting oil pipeline (7) is connected to the heat exchanger in the domestic water tank (12) through the domestic water tank heat-conducting oil control valve (10); the second branch of the solar heat-conducting oil pipeline (7) is connected to the heat exchanger in the energy storage water tank (3) through the energy storage water tank heat-conducting oil control valve (11).

[0030] The solar heat-conducting oil circulation pump (9) is used to drive the heat-conducting oil medium to flow in the solar heat-conducting oil pipeline (7), so that the heat-conducting oil medium exchanges heat indirectly with the water in the domestic water tank (12) and / or the energy storage water tank (3).

[0031] The domestic water tank heat-conducting oil control valve (10) is used to open or close the indirect heat exchange between the heat-conducting oil medium and the water in the domestic water tank (12); the energy storage water tank heat-conducting oil control valve (11) is used to open or close the indirect heat exchange between the heat-conducting oil medium and the water in the energy storage water tank (3).

[0032] The heat-conducting oil overheat control valve (8) is arranged between the inlet and the outlet of the solar heat collecting tube group (6) and is used to control the flow rate of the heat-conducting oil medium entering the heat exchanger in the domestic water tank (12) and the heat exchanger in the energy storage water tank (3) to avoid excessive water temperature.

[0033] In this embodiment, the first air energy subsystem includes: an air energy unit (1) and an air energy circulating water pump (2).

[0034] The air energy unit (1) uses air thermal energy to cool or heat water.

[0035] The air energy circulating water pump (2) is used to drive the water in the energy storage water tank (3) to flow through the air energy unit (1) for cooling or heating. In practical applications, the water in the energy storage water tank (3) can be cooled in summer and then supplied to the air-conditioning terminal, and can be heated in winter for indoor heating.

[0036] In this embodiment, the air energy second subsystem includes: an air energy water heater (15), a heat supplement circulating pump (16), a heat supplement pipeline (20), a first domestic water tank heat supplement control valve (17-1) and a second domestic water tank heat supplement control valve (17-2), as well as a first energy storage water tank heat supplement control valve (18-1) and a second energy storage water tank heat supplement control valve (18-2).

[0037] The air energy water heater (15) uses the heat energy in the air to heat water; the heat supplement pipeline (20) is used to connect the air energy water heater (15), the heat supplement circulating pump (16), the domestic water tank (12) and the energy storage water tank (3); the heat supplement circulating pump (16) is used to drive the water in the domestic water tank (12) or the energy storage water tank (3) to flow through the heat supplement pipeline (20) into the air energy water heater (15) for heating, so as to realize the auxiliary heating of the domestic water tank (12) or the energy storage water tank (3). In practical applications, when the solar energy is insufficient in winter, the air energy second subsystem will be enabled.

[0038] The first branch of the heat supplement pipeline (20) is connected to the domestic water tank (12) through the first domestic water tank heat supplement control valve (17-1) and the second domestic water tank heat supplement control valve (17-2); the second branch of the heat supplement pipeline (20) is connected to the energy storage water tank (3) through the first energy storage water tank heat supplement control valve (18-1) and the second energy storage water tank heat supplement control valve (18-2).

[0039] The first domestic water tank heat supplement control valve (17-1) and the second domestic water tank heat supplement control valve (17-2) are respectively arranged at the inlet and outlet of the domestic water tank (12) connecting the first branch of the heat supplement pipeline (20) to open or close the auxiliary heating of the domestic water tank (12).

[0040] The first energy storage water tank heat supplement control valve (18-1) and the second energy storage water tank heat supplement control valve (18-2) are respectively arranged at the inlet and outlet of the energy storage water tank (3) connecting the second branch of the heat supplement pipeline (20) to open or close the auxiliary heating of the energy storage water tank (3).

[0041] In this embodiment, the on-site data acquisition control cabinet (19) is used to collect the monitored temperatures of the energy storage water tank temperature sensor (4) and the domestic water tank temperature sensor (13), and control the solar energy subsystem, the air energy first subsystem and the air energy second subsystem according to the preset rules to realize the temperature regulation of domestic water and cooling / heating water.

[0042] The working modes of the on-site data acquisition control cabinet (19) include: summer working mode and winter working mode.

[0043] In this embodiment, the preset rules include: In the summer working mode, open the heat-conducting oil control valve (10) of the domestic water tank, close the heat-conducting oil control valve (11) of the energy storage water tank, and start the solar heat-conducting oil circulation pump (9) to heat the domestic water tank (12) with the heat-conducting oil medium; monitor the water temperature of the domestic water tank (12) through the water temperature sensor (13) of the domestic water tank, and after reaching the first target temperature, close the solar heat-conducting oil circulation pump (9); start the air energy unit (1) and the air energy circulation water pump (2) to cool the water in the energy storage water tank (3) to the second target temperature, and use the first water supply pump (5) to send the cold water to the indoor end of the user. The above processes of heating the domestic water tank (12) by solar energy and cooling the energy storage water tank (13) by air energy operate independently.

[0044] In the winter working mode, solar energy and air energy cooperate with each other. First, open the heat-conducting oil control valve (10) of the domestic water tank, close the heat-conducting oil control valve (11) of the energy storage water tank, heat the domestic water tank (12) to the third target temperature, then close the heat-conducting oil control valve (10) of the domestic water tank, open the heat-conducting oil control valve (11) of the energy storage water tank, and preheat the energy storage water tank (3); then start the air energy unit (1) and the air energy circulation water pump (2) to heat the water in the energy storage water tank (3) to the fourth target temperature, and use the first water supply pump (5) to send the hot water to the indoor end of the user.

[0045] In this embodiment, due to the adoption of a new type of heat-conducting oil medium, the medium temperature is much higher than the water temperature of the water tank (the solar heat collection adopts vacuum heat insulation technology to reduce heat loss, so that the heat-conducting oil absorbs more heat and heats up, and the temperature in winter is 50°C - 80°C on cloudy days or when the solar radiation intensity is weak). As long as the temperature is higher than the actual temperature monitored by the temperature sensor (4) of the energy storage water tank, it can play a role in preheating. This is the innovation in improving energy efficiency in this embodiment. After preheating, it is then heated again by the air energy unit (1) in the heating mode and compared with the preset heating temperature of the on-site data acquisition control cabinet (19) to control the working time of the air energy unit (1).

[0046] The above first target temperature, second target temperature, third target temperature, and fourth target temperature can have different values at different times, and all can be set through the human-machine interface of the on-site data acquisition control cabinet (19).

[0047] In the summer working mode or winter working mode, in special weather conditions (such as rainy, foggy, etc.), if the solar energy is insufficient and the water in the domestic water tank (12) cannot reach the third target temperature, the first domestic water tank heat supplement control valve (17-1) and the second domestic water tank heat supplement control valve (17-2) are opened, the first energy storage water tank heat supplement control valve (18-1) and the second energy storage water tank heat supplement control valve (18-2) are closed, and the air source heat pump water heater (15) and the heat supplement circulation pump (16) are started to assist in heating the domestic water tank (12).

[0048] In the winter working mode, under special conditions (such as extremely cold weather, etc.), when the water in the energy storage water tank (3) cannot reach the fourth target temperature, the first domestic water tank heat supplement control valve (17-1) and the second domestic water tank heat supplement control valve (17-2) are closed, the first energy storage water tank heat supplement control valve (18-1) and the second energy storage water tank heat supplement control valve (18-2) are opened, and the air source heat pump water heater (15) and the heat supplement circulation pump (16) are started to assist in heating the energy storage water tank (3) to meet the temperature requirements under extremely low winter temperatures.

[0049] The extreme temperature requirements for winter domestic water and heating water occur in different time periods, and the auxiliary heating requirements of the two water tanks can be coordinated according to user settings.

[0050] In the summer period, due to sufficient solar energy and small heating loads, there is only domestic hot water load and it is supplied intermittently. It is possible that the temperature of the domestic hot water tank (12) is overheated. When the actual temperature of the tank exceeds its target temperature, the overheat control valve (8) is opened to reduce the heat exchange of the tank and avoid overheating of the domestic water tank; in the winter period, due to large heating load requirements, the solar energy collection system operates at full capacity to collect heat.

[0051] In an optional embodiment, the present invention adopts a "space-time two-dimensional scheduling algorithm", establishing an energy demand period control strategy in the time dimension (self-setting for morning, noon, and evening). For example, Table 1 below is an example of a winter control strategy: Table 1 Target temperatures and equipment activation rules for different periods Time period type Target temperature of domestic hot water Equipment enabling rule Target temperature of heating water Equipment enabling rule Morning preparation period (05:00 - 07:00) 45±10℃ When solar energy is insufficient, the air - source heat pump water heater (15) starts 50±5℃ On the premise that solar energy ensures the domestic water temperature, pre - heat the energy storage water tank, and the air - source heat pump unit (1) starts to ensure the target temperature Daytime energy storage period (08:00 - 16:00) 45+10℃ In winter, the solar collector operates at full capacity; in summer, when the temperature reaches the upper limit, open the heat - transfer oil overheat control valve (8) to operate 50±5℃ On the condition that solar energy ensures the lower limit of domestic water temperature, heat the energy storage water tank, and the air - source heat pump unit (1) starts to supplement heat Evening peak period (17:00 - 22:00) 45±1℃ When solar energy is insufficient, the air - source heat pump water heater (15) starts 50±1℃ On the premise that solar energy ensures the domestic water temperature, pre - heat the energy storage water tank, and the air - source heat pump unit (1) starts to ensure the target temperature Night - time balance period (23:00 - 04:00) 45±10℃ When solar energy is insufficient, the air - source heat pump water heater (15) starts 50±5℃ The air - source heat pump unit (1) starts to ensure the target temperature In addition, in the space dimension, multi-tank thermal coordination is developed to improve the thermal efficiency. By setting strategies and monitoring data, the opening and closing of control valves are adjusted, and the operation of water pumps is controlled according to demand rules to adapt to the building energy use needs in rural areas in a digital management and control manner. The priority division in space is as shown in Table 2 below: Table 2 Priority settings for the two water tanks in different periods Time period type Spatial priority Equipment enabling rule Morning preparation period (05:00 - 07:00) Domestic water tank The air - source heat pump water heater (15) starts for pre - heating Daytime energy storage period (08:00 - 16:00) Energy storage water tank Solar energy heats the energy storage water tank, and the air - source heat pump unit (1) starts to supplement heat Evening peak period (17:00 - 22:00) Domestic water tank The air - source heat pump water heater (15) starts for pre - heating Night - time balance period (23:00 - 04:00) Energy storage water tank The air - source heat pump unit (1) starts to ensure the target temperature Those skilled in the art should be able to realize that the method steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in the form of electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0052] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A combined system for heating and cooling rural buildings, characterized in that: The system comprises: a first water supply subsystem, a second water supply subsystem, a solar energy subsystem, a first air energy subsystem and a second air energy subsystem; The first water supply subsystem and the second water supply subsystem respectively comprise: an energy storage water tank (3) and a domestic water tank (12); The solar energy subsystem comprises: a solar energy heat collection pipe group (6), a solar energy heat transfer oil pipeline (7) and a solar energy heat transfer oil circulation pump (9); The solar heat collecting tube group (6) is used to absorb solar energy and heat the heat transfer oil medium; The solar thermal oil pipeline (7) is used to connect the solar thermal collector tube group (6), the solar thermal oil circulation pump (9), the heat exchanger in the domestic water tank (12), and the heat exchanger in the energy storage water tank (3); The solar thermal oil circulation pump (9) is used to drive the thermal oil medium to flow in the solar thermal oil pipeline (7), so that the thermal oil medium performs indirect heat exchange with water in the domestic water tank (12) and / or the energy storage water tank (3); The air energy first subsystem comprises: an air energy unit (1) and an air energy circulation water pump (2); The air energy unit (1) utilizes air thermal energy to cool or heat water; The air energy circulation water pump (2) is used to drive the water in the energy storage water tank (3) to flow through the air energy unit (1) for cooling or heating; The air energy second subsystem comprises: an air energy water heater (15), a heat supply circulation pump (16) and a heat supply pipeline (20); The heat supply pipeline (20) is used to connect the air energy water heater (15), the heat supply circulation pump (16), the domestic water tank (12) and the energy storage water tank (3); The heat supplement circulation pump (16) is used to drive the water in the domestic water tank (12) or the energy storage water tank (3) to flow through the heat supplement pipeline (20) into the air energy water heater (15) for heating, thereby achieving auxiliary heating of the domestic water tank (12) or the energy storage water tank (3).

2. The combined system for heating and cooling rural buildings according to claim 1 is characterized in that: The first water supply subsystem further comprises: an energy storage tank temperature sensor (4); The second water supply subsystem further comprises: a domestic water tank temperature sensor (13); The energy storage water tank temperature sensor (4) and the domestic water tank temperature sensor (13) are used to monitor the temperature of water in the energy storage water tank (3) and the domestic water tank (12), respectively; The system further comprises: a field data acquisition control cabinet (19); The field data acquisition control cabinet (19) is used to collect the monitored temperatures of the energy storage water tank temperature sensor (4) and the domestic water tank temperature sensor (13), and to control the solar energy subsystem, the first air energy subsystem and the second air energy subsystem according to preset rules, so as to achieve temperature regulation of domestic water and water for cooling / heating.

3. The combined system for heating and cooling rural buildings according to claim 2 is characterized in that: The solar energy subsystem further comprises: a domestic water tank thermal oil control valve (10) and an energy storage water tank thermal oil control valve (11); The first branch of the solar thermal oil pipeline (7) is connected to the heat exchanger in the domestic water tank (12) via the domestic water tank thermal oil control valve (10); The second branch of the solar thermal oil pipeline (7) is connected to the heat exchanger in the energy storage water tank (3) via the energy storage water tank thermal oil control valve (11); The domestic water tank heat transfer oil control valve (10) is used to open or close the indirect heat exchange between the heat transfer oil medium and the water in the domestic water tank (12); The energy storage water tank heat transfer oil control valve (11) is used to open or close the indirect heat exchange between the heat transfer oil medium and the water in the energy storage water tank (3).

4. The combined system for heating and cooling rural buildings according to claim 3 is characterized in that: The second air energy subsystem further comprises: a first domestic water tank heat replenishment control valve (17-1) and a second domestic water tank heat replenishment control valve (17-2), and a first energy storage water tank heat replenishment control valve (18-1) and a second energy storage water tank heat replenishment control valve (18-2); The first branch of the heat supply pipeline (20) is connected to the domestic water tank (12) via the first domestic water tank heat supply control valve (17-1) and the second domestic water tank heat supply control valve (17-2); The second branch of the heat replenishment pipeline (20) is connected to the energy storage water tank (3) via the first energy storage water tank heat replenishment control valve (18-1) and the second energy storage water tank heat replenishment control valve (18-2); The first domestic water tank heat supplement control valve (17-1) and the second domestic water tank heat supplement control valve (17-2) are respectively arranged at the inlet and outlet of the domestic water tank (12) connected to the heat supplement pipeline (20), and are used to turn on or off the auxiliary heating of the domestic water tank (12); The first energy storage water tank heat supplement control valve (18-1) and the second energy storage water tank heat supplement control valve (18-2) are respectively arranged at the inlet and outlet of the energy storage water tank (3) connected to the heat supplement pipeline (20), and are used to turn on or off the auxiliary heating of the energy storage water tank (3).

5. The combined system for heating and cooling rural buildings according to claim 4 is characterized in that: The first water supply subsystem further comprises: a first water supply pump (5); The second water supply subsystem further comprises: a second water supply pump (14); The first water supply pump (5) and the second water supply pump (14) are used to respectively deliver water in the energy storage water tank (3) and the domestic water tank (12) to corresponding user terminals.

6. The combined system for heating and cooling rural buildings according to claim 5 is characterized in that: The working modes of the field data acquisition control cabinet (19) include: a summer working mode and a winter working mode; The preset rules include: In the summer working mode, the heat transfer oil control valve (10) of the domestic water tank is opened, the heat transfer oil control valve (11) of the energy storage water tank is closed, the solar heat transfer oil circulation pump (9) is started so that the heat transfer oil medium heats the domestic water tank (12) to a first target temperature, and then the solar heat transfer oil circulation pump (9) is closed; the air energy unit (1) and the air energy circulation water pump (2) are started to cool the water in the energy storage water tank (3) to a second target temperature, and the first water supply pump (5) is used to deliver cold water to the user's indoor terminal; In the winter working mode, the heat transfer oil control valve (10) of the domestic water tank is opened, and the heat transfer oil control valve (11) of the energy storage water tank is closed. After the domestic water tank (12) is heated to a third target temperature, the heat transfer oil control valve (10) of the domestic water tank is closed, and the heat transfer oil control valve (11) of the energy storage water tank is opened to preheat the energy storage water tank (3); the air energy unit (1) and the air energy circulation water pump (2) are started to heat the water in the energy storage water tank (3) to a fourth target temperature, and the first water supply pump (5) is used to deliver the hot water to the indoor terminal of the user; The values ​​of the first target temperature, the second target temperature, the third target temperature and the fourth target temperature are set via a human-machine interaction interface of the on-site data acquisition control cabinet (19).

7. The combined system for heating and cooling rural buildings according to claim 6 is characterized in that: The preset rules also include: In the summer working mode or the winter working mode, when the water in the domestic water tank (12) cannot reach the third target temperature, the first domestic water tank heat supplement control valve (17-1) and the second domestic water tank heat supplement control valve (17-2) are opened, the first energy storage water tank heat supplement control valve (18-1) and the second energy storage water tank heat supplement control valve (18-2) are closed, and the air energy water heater (15) and the heat supplement circulation pump (16) are started to perform auxiliary heating on the domestic water tank (12); In the winter working mode, when the water in the energy storage water tank (3) cannot reach the fourth target temperature, the first domestic water tank heat supplement control valve (17-1) and the second domestic water tank heat supplement control valve (17-2) are closed, the first energy storage water tank heat supplement control valve (18-1) and the second energy storage water tank heat supplement control valve (18-2) are opened, and the air energy water heater (15) and the heat supplement circulation pump (16) are started to perform auxiliary heating on the energy storage water tank (3).

8. The combined system for heating and cooling rural buildings according to claim 2 is characterized in that: The solar energy subsystem further comprises: a thermal oil overheat control valve (8); The heat transfer oil overheat control valve (8) is arranged between the inlet and the outlet of the solar heat collection tube group (6) and is used to control the flow rate of the heat transfer oil medium entering the heat exchanger in the domestic water tank (12) and the heat exchanger in the energy storage water tank (3) to avoid excessive water temperature.

9. The combined system for heating and cooling rural buildings according to claim 2, characterized in that: The field data acquisition control cabinet (19) uses a time-space dual-dimensional scheduling algorithm to perform control operations: In the time dimension, target temperatures of the domestic water tank (12) and the energy storage water tank (3) are set in different time periods, and activation rules of the solar energy subsystem, the first air energy subsystem and the second air energy subsystem are set; In the spatial dimension, the priorities of the domestic water tank (12) and the energy storage water tank (3) in different time periods are set, and activation rules of the solar energy subsystem, the first air energy subsystem and the second air energy subsystem are set.

10. The combined system for heating and cooling rural buildings according to any one of claims 1 to 9, characterized in that: The heat transfer oil medium is biphenyl-biphenyl ether eutectic heat transfer oil.

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