Heat and water supply system and control method thereof

Abstract

The invention relates to the technical field of solar energy, and discloses a heat and water supply system and a control method thereof. The heat and water supply system comprises a solar heat collection device, an auxiliary heat collection device, a first heat storage device and a second heat storage device. The outlet end of the auxiliary heat collection device communicates with water consumption equipment and a water inlet of a heating device. The first heat storage device comprises a first heat exchange flow channel and a first water supply flow channel which are in heat exchange fit, the first heat exchange flow channel communicates with a low-temperature working medium inlet and a high-temperature working medium outlet of the solar heat collection device, one end of the first water supply flow channel communicates with an external water source, and the other end of the first water supply flow channel communicates with water consuming equipment and the auxiliary heat collection device. The second heat storage device comprises a second heat exchange flow channel and a second water supply flow channel which are in heat exchange fit, the second heat exchange flow channel communicates with a low-temperature working medium inlet and a high-temperature working medium outlet of the solar heat collection device, one end of the second water supply flow channel communicates with a water outlet of the heating device, and the other end of the second water supply flow channel communicates with the auxiliary heat collection device. Therefore, the requirements of users on heating and hot water are met.

Description

Technical Field

[0001] The present invention relates to the technical field of solar energy, and particularly to a heating and water supply system and a control method thereof. Background Art

[0002] With the increasingly tense global energy supply and prominent environmental problems, solar energy, as a typical clean and renewable energy source, has received extensive attention. In cold winters, heating accounts for a large proportion of domestic energy consumption, followed by hot water supply. The traditional solar heating mode is usually: converting solar energy into electric energy and sending it to an energy storage device, and then using an electric heating device to convert it into heat and send it to users. However, due to the high energy value of electric energy, directly using it for heating will greatly reduce the effective energy utilization value of solar energy; in addition, in cold winters, as the temperature drops, the heating load increases, and the user's demand for hot water also increases. At this time, if solely relying on solar energy to achieve heating and hot water supply, it cannot meet the user's needs.

[0003] Therefore, there is an urgent need to propose a heating and water supply system to solve the above problems. Summary of the Invention

[0004] Based on the above, the purpose of the present invention is to provide a heating and water supply system and a control method thereof, which can, on the basis of making full use of solar energy resources, assist in using other energy sources, so as to not only improve the utilization rate of renewable energy, but also ensure the user's demand for heating and hot water.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a heating and water supply system, including:

[0007] A solar heat collection device, including a low-temperature working medium inlet and a high-temperature working medium outlet;

[0008] An auxiliary heat collection device, whose outlet end is used to connect to the water inlet of a water-using device and the water inlet of a heating device;

[0009] A first heat storage device, including a first heat exchange flow channel and a first water supply flow channel that cooperate in heat exchange. The first heat exchange flow channel is respectively communicated with the low-temperature working medium inlet and the high-temperature working medium outlet to form a first circulation loop. One end of the first water supply flow channel is communicated with an external water source, and the other end is respectively communicated with the water inlet of the water-using device and the inlet of the auxiliary heat collection device;

[0010] The second heat storage device includes a second heat exchange flow channel and a second water supply flow channel that cooperate in heat exchange. The second heat exchange flow channel is respectively connected to the low-temperature working medium inlet and the high-temperature working medium outlet to form a second circulation loop. One end of the second water supply flow channel is used to connect to the water outlet of the heating device, and the other end is used to connect to the inlet of the auxiliary heat collection device.

[0011] As a preferred solution of the heating and water supply system provided by the present invention, the solar heat collection device further includes a three-way valve. The inlet of the three-way valve is connected to the high-temperature working medium outlet. The first outlet of the three-way valve is connected to the inlet of the first heat exchange flow channel, and the second outlet of the three-way valve is connected to the inlet of the second heat exchange flow channel.

[0012] As a preferred solution of the heating and water supply system provided by the present invention, the first water supply flow channel includes:

[0013] A hot water storage tank, which is provided with a first water outlet and a second water outlet;

[0014] A first water supply pipeline, and both ends of the first water supply pipeline are respectively connected to the second water outlet and the water inlet of the water-using device;

[0015] A second water supply pipeline, including a first branch and a second branch. Both ends of the first branch are respectively connected to the first water outlet and the inlet of the auxiliary heat collection device. Both ends of the second branch are respectively connected to the outlet of the auxiliary heat collection device and the water inlet of the water-using device.

[0016] As a preferred solution of the heating and water supply system provided by the present invention, the first water supply flow channel further includes a circulation pipeline, and both ends of the circulation pipeline are respectively connected to the hot water storage tank and a position of the first water supply pipeline close to the water-using device; and / or

[0017] The first heat storage device further includes a circulation pipeline, and both ends of the circulation pipeline are respectively connected to the hot water storage tank and a position of the second branch close to the water-using device.

[0018] As a preferred solution of the heating and water supply system provided by the present invention, the number of the first heat storage devices is at least two, and at least two of the first heat storage devices are connected in series in sequence; and / or

[0019] The number of the second heat storage devices is at least two, and at least two of the second heat storage devices are connected in series in sequence.

[0020] As a preferred solution of the heating and water supply system provided by the present invention, the auxiliary heat collection device is a gas furnace or an oil furnace; or the auxiliary heat collection device is a gas and oil combined heating furnace.

[0021] The present invention also provides a heating and water supply control method. Based on the above heating and water supply system, the heating and water supply control method includes the following steps:

[0022] Step S100: Read the working mode selected by the user. In the hot water mode, execute Step S200; in the heating mode, sequentially execute Steps S200 to S300;

[0023] Step S200: Determine whether the temperature T1 of the water in the first water supply channel is less than the first preset minimum temperature T01. If so, the solar working fluid circulates in the first heat exchange channel to heat the water in the first water supply channel;

[0024] Step S300: Determine whether the temperature T1 of the water in the first water supply channel is greater than or equal to the first preset maximum temperature T01'. If so, execute Step S301;

[0025] Step S301: Determine whether the temperature T2 of the water in the second water supply channel is less than the second preset minimum temperature T02. If so, the solar working fluid circulates in the second heat exchange channel to heat the water in the second water supply channel.

[0026] As a preferred solution of the heating and water supply control method provided by the present invention, in the Step S200, it further includes:

[0027] When the difference between the temperature T1 of the water in the first water supply channel and the temperature T3 of the solar working fluid circulating in the first heat exchange channel is less than the first preset minimum difference T03, the auxiliary heat collection device is started;

[0028] When the difference between the temperature T1 of the water in the first water supply channel and the temperature T3 of the solar working fluid circulating in the first heat exchange channel is greater than the first preset maximum difference T04, the auxiliary heat collection device is closed;

[0029] Wherein, T03 < T04.

[0030] As a preferred solution of the heating and water supply control method provided by the present invention, in the Step S300, it further includes:

[0031] When the difference between the temperature T2 of the water in the second water supply channel and the temperature T3 of the solar working fluid circulating in the second heat exchange channel is less than the second preset minimum difference T05, the auxiliary heat collection device is started;

[0032] When the difference between the temperature T2 of the water in the second water supply channel and the temperature T3 of the solar working fluid circulating in the second heat exchange channel is greater than the second preset maximum difference T06, the auxiliary heat collection device is closed;

[0033] Wherein, T05 < T06.

[0034] As a preferred solution of the heating and water supply control method provided by the present invention, the heating and water supply control method further includes: when the temperature T4 of the water in the water supply pipeline between the first water supply channel and the water-using device is less than the third preset minimum temperature T07, the circulation pipeline is opened.

[0035] The beneficial effects of the present invention are as follows:

[0036] For the heating and water supply system provided by the present invention, when the sun is sufficient, the solar working medium can be heated and circulated in the first heat exchange channel to heat the water in the first water supply channel. When the user needs to use hot water, the water with a higher temperature in the first water supply channel can flow out to the water-using device; when the user's demand for hot water is large or the solar energy is insufficient, the water flowing out from the first water supply channel can be heated by the auxiliary heat collection device first and then supplied to the water-using device to meet the user's needs; in winter when heating is required, when the sun is sufficient, the solar working medium can be heated and circulated in the second heat exchange channel to heat the water in the second water supply channel, and the water with a higher temperature in the second water supply channel can flow to the heating device to provide heating for the user; when the user's heating load is large or the solar energy is insufficient, the auxiliary heat collection device can assist in heating the water flowing out from the second water supply channel to meet the user's needs. In addition, in this heating and water supply system, solar energy does not need to be converted into electric energy before heating and supplying water to users, which can greatly improve the effective energy utilization value of solar energy. This heating and water supply system can assist in using other energy sources on the basis of making full use of solar energy resources, so as to not only improve the utilization rate of renewable energy, but also ensure the user's demand for heating and hot water.

[0037] The control method provided by the present invention, through the above-mentioned heating and water supply system, can assist in using other energy sources on the basis of making full use of solar energy resources, so as to not only improve the utilization rate of renewable energy, but also ensure the user's demand for heating and hot water. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0039] Figure 1 is the schematic diagram of the heating and water supply system provided by the embodiment of the present invention;

[0040] Figure 2 is the flowchart of the heating and water supply control method provided by the embodiment of the present invention.

[0041] In the figure:

[0042] 1 - Solar heat collection device; 11 - Solar collector; 12 - Solar low-temperature working medium pipeline; 13 - Solar high-temperature working medium pipeline; 14 - Three-way valve; 15 - First circulation pump;

[0043] 2 - Auxiliary heat collection device;

[0044] 3 - First heat storage device; 31 - First water supply pipeline; 32 - Second water supply pipeline; 321 - First branch; 322 - Second branch; 33 - Circulation pipeline; 331 - Second circulation pump;

[0045] 4 - Second heat storage device;

[0046] 10 - Water-using equipment; 20 - Heating device. Detailed implementation mode

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0048] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0049] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0050] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", and "right" are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for differentiation in description and have no special meanings.

[0051] Figure 1 The schematic diagram of the heating and water supply system provided in this embodiment is shown. As Figure 1 shown, this embodiment provides a heating and water supply system, which includes a solar heat collection device 1, an auxiliary heat collection device 2, a first heat storage device 3, and a second heat storage device 4. The solar heat collection device 1 includes a low-temperature working medium inlet and a high-temperature working medium outlet; the outlet end of the auxiliary heat collection device 2 is used to connect to the water inlet of the water-using device 10 and the water inlet of the heating device 20; the first heat storage device 3 includes a first heat exchange flow channel and a first water supply flow channel that cooperate in heat exchange. The first heat exchange flow channel is respectively connected to the low-temperature working medium inlet and the high-temperature working medium outlet to form a first circulation loop. One end of the first water supply flow channel is connected to an external water source, and the other end is respectively connected to the water inlet of the water-using device 10 and the inlet of the auxiliary heat collection device 2; the second heat storage device 4 includes a second heat exchange flow channel and a second water supply flow channel that cooperate in heat exchange. The second heat exchange flow channel is respectively connected to the low-temperature working medium inlet and the high-temperature working medium outlet to form a second circulation loop. One end of the second water supply flow channel is used to connect to the water outlet of the heating device 20, and the other end is used to connect to the inlet of the auxiliary heat collection device 2.

[0052] In the heating and water supply system provided in this embodiment, when there is sufficient sunlight, the solar energy working medium can be heated and circulated in the first heat exchange flow channel to heat the water in the first water supply flow channel. When the user needs to use hot water, the water with a higher temperature in the first water supply flow channel can flow out to the water-using device 10. When the user's demand for hot water is large or the solar energy is insufficient, the water flowing out from the first water supply flow channel can be first heated by the auxiliary heat collection device 2 and then supplied to the water-using device 10 to meet the user's needs. In winter when heating is required, when there is sufficient sunlight, the solar energy working medium can be heated and circulated in the second heat exchange flow channel to heat the water in the second water supply flow channel. The water with a higher temperature in the second water supply flow channel can flow to the heating device 20 to provide heating for the user. When the user's heating load is large or the solar energy is insufficient, the auxiliary heat collection device 2 can assist in heating the water flowing out from the second water supply flow channel to meet the user's needs. In addition, in this heating and water supply system, solar energy does not need to be converted into electric energy before heating and supplying water to the user, which can greatly improve the effective energy utilization value of solar energy. This heating and water supply system can assist in using other energy sources on the basis of making full use of solar energy resources, so as to not only improve the utilization rate of renewable energy but also ensure the user's demand for heating and hot water.

[0053] Further, the solar energy heat collection device 1 includes a solar energy low-temperature working medium pipeline 12, a solar energy collector 11, and a solar energy high-temperature working medium pipeline 13 that are sequentially arranged and connected in communication along the flowing direction of the solar energy working medium. Among them, the inlet of the solar energy low-temperature working medium pipeline 12 forms the above-mentioned low-temperature working medium inlet, and the outlet of the solar energy high-temperature working medium pipeline 13 forms the above-mentioned high-temperature working medium outlet.

[0054] In this embodiment, the solar energy working medium is solar antifreeze, which can prevent the solar energy working medium from freezing in cold winter, so that solar energy can be fully utilized. To make full use of solar energy, in this embodiment, the number of solar energy collectors 11 is at least two, and at least two solar energy collectors 11 are connected in series in sequence.

[0055] The solar energy heat collection device 1 further includes a three-way valve 14. The inlet of the three-way valve 14 is connected in communication with the high-temperature working medium outlet. The first outlet of the three-way valve 14 is communicated with the inlet of the first heat exchange flow channel, and the second outlet of the three-way valve 14 is communicated with the inlet of the second heat exchange flow channel. When the first outlet of the three-way valve 14 is opened and the second outlet is closed, the solar energy working medium in the solar energy high-temperature working medium pipeline 13 can flow into the first heat exchange flow channel through the first outlet of the three-way valve 14 to heat the water in the first water supply flow channel, thereby realizing the hot water supply mode. When the second outlet of the three-way valve 14 is opened and the first outlet is closed, the solar energy working medium in the solar energy high-temperature working medium pipeline 13 can flow into the second heat exchange flow channel through the second outlet of the three-way valve 14 to heat the water in the second water supply flow channel, thereby realizing the heating mode.

[0056] Optionally, a first circulation pump 15 is provided on the solar low-temperature working medium pipeline 12 or the solar high-temperature working medium pipeline 13.

[0057] Continue as Figure 1 As shown, the first water supply flow channel includes a hot water storage tank, a first water supply pipeline 31 and a second water supply pipeline 32. The hot water storage tank is provided with a first water outlet and a second water outlet. The two ends of the first water supply pipeline 31 are respectively communicated with the second water outlet of the hot water storage tank and the water inlet of the water-using device 10; the second water supply pipeline 32 includes a first branch 321 and a second branch 322. The two ends of the first branch 321 are respectively communicated with the first water outlet of the hot water storage tank and the inlet of the auxiliary heat collection device 2, and the two ends of the second branch 322 are respectively communicated with the outlet of the auxiliary heat collection device 2 and the water inlet of the water-using device 10.

[0058] Due to the poor heat preservation performance of the water supply pipeline, when the user opens the water-using device 10, a certain volume of cold water will flow out from the water-using device 10 first, which affects the user experience and causes waste of water resources. To solve this problem, the first water supply flow channel further includes a circulation pipeline 33. The two ends of the circulation pipeline 33 are respectively communicated with the hot water storage tank and a position of the first water supply pipeline 31 close to the water-using device 10. When the temperature of the water in the first water supply pipeline 31 is relatively low, the water in the first water supply pipeline 31 and the hot water storage tank can be heat-exchanged through the circulation pipeline 33, so that the water in the first water supply pipeline 31 is always maintained within a preset temperature range, preventing the water temperature from being too low at the initial stage when the user opens the water-using device 10. Of course, in other embodiments, a circulation pipeline 33 is also provided at the position of the hot water storage tank and the second branch 322 close to the water-using device 10. When the water in the hot water storage tank sequentially passes through the first branch 321, the auxiliary heat collection device 2 and the second branch 322, the water temperature of the water flowing out from the water-using device 10 will not be too low. Optionally, a second circulation pump 331 is provided on the circulation pipeline 33.

[0059] To increase the hot water storage capacity to meet user needs, the number of the first heat storage devices 3 is at least two, and at least two first heat storage devices 3 are connected in series in sequence. In this embodiment, the number of the first heat storage devices 3 is two, so as to reduce the number of the first heat storage devices 3, reduce the volume of the heat supply and water supply system, and reduce the production cost while meeting user needs. Of course, in other embodiments, the number of the first heat storage devices 3 can also be any number of three or more, and designers can adjust according to factors such as user needs and the volume of a single hot water storage tank.

[0060] In this embodiment, the number of the second heat storage devices 4 is one. In other embodiments, the number of the second heat storage devices 4 is at least two, and at least two second heat storage devices 4 are connected in series in sequence. The number of the second heat storage devices 4 in this embodiment is not limited, as long as it can meet the heating needs of users.

[0061] It should be noted that in cold winter, while the heating load of users increases, the demand for hot water also increases, and the solar energy is insufficient compared with summer. At this time, the solar heat collection device 1 preferentially heats the water in the hot water storage tank to provide sufficient hot water for users. The auxiliary heat collection device 2 is always on to heat the water flowing out from the second water supply channel, so as to ensure the heating demand of users. When the amount of hot water in the hot water storage tank reaches the preset volume, the control module of the heating water supply system can control the second outlet of the three-way valve 14 to open and the first outlet to close. At this time, the solar heat collection device 1 and the auxiliary heat collection device 2 jointly heat the water in the second water supply channel. Since the water flowing out from the second water supply channel has been heated to a certain temperature by the solar heat collection device 1, this setting can also reduce the energy consumption of the auxiliary heat collection device 2, thereby reducing the living cost of users.

[0062] In this embodiment, the auxiliary heat collection device 2 can be a gas furnace or an oil furnace, or can also be a gas and oil combined heating furnace. Optionally, the number of the auxiliary heat collection devices 2 is two. One auxiliary heat collection device 2 is arranged between the first water outlet of the first water supply channel and the water using device 10, and the other auxiliary heat collection device 2 is arranged between the water outlet of the second water supply channel and the heating device 20. When there is no heating demand, the auxiliary heat collection device 2 arranged between the water outlet of the second water supply channel and the heating device 20 is always closed, and the second outlet of the three-way valve 14 is always closed to save energy consumption and reduce the living cost of users. When there is a heating demand, the auxiliary heat collection device 2 arranged between the water outlet of the second water supply channel and the heating device 20 is selectively opened or closed. When the temperature of the water in the second water supply channel is lower than the preset minimum heating temperature, this auxiliary heat collection device 2 is opened. When the temperature of the water in the second water supply channel is higher than the preset maximum heating temperature, this auxiliary heat collection device 2 is closed. The auxiliary heat collection device 2 arranged between the first water outlet of the hot water storage tank and the water using device 10 is selectively opened or closed. When the solar energy is insufficient, this auxiliary heat collection device 2 is opened. When the solar energy is sufficient, this auxiliary heat collection device 2 is closed.

[0063] This embodiment also provides a heating water supply control method based on the above heating water supply system. The heating water supply control method includes the following steps:

[0064] Step S100: Read the working mode selected by the user. In the hot water mode, execute step S200. In the heating mode, sequentially execute steps S200 - S300;

[0065] Step S200: Judge whether the temperature T1 of the water in the first water supply channel is less than the first preset minimum temperature T01. If so, the solar working medium circulates in the first heat exchange channel to heat the water in the first water supply channel;

[0066] Step S300: Determine whether the temperature T1 of the water in the first water supply channel is greater than or equal to the first preset maximum temperature T01'. If so, execute Step S301;

[0067] Step S301: Determine whether the temperature T2 of the water in the second water supply channel is less than the second preset minimum temperature T02. If so, the solar working fluid circulates in the second heat exchange channel to heat the water in the second water supply channel.

[0068] Specifically, in this embodiment, a first temperature sensor is provided in the first water supply channel, and the first temperature sensor is used to detect the temperature T1 of the water in the first water supply channel. When T1 < T01, it indicates that the temperature of the water in the first water supply channel is relatively low at this time. The control module then controls the first circulation pump 15 to open, and opens the first outlet and closes the second outlet of the three-way valve 14, so that the solar working fluid circulates in the first heat exchange channel to heat the water in the first water supply channel, preventing insufficient hot water when the user needs to use hot water.

[0069] In this embodiment, a second temperature sensor is provided in the second water supply channel, and the second temperature sensor is used to detect the temperature T2 of the water in the second water supply channel. When the user selects the heating mode, the solar heat collection device 1 preferentially heats the water in the first water supply channel. When T1 ≥ T01', it indicates that the temperature of the water in the first water supply channel is relatively high at this time and should be able to meet the user's demand for hot water. The control module then controls the second outlet of the three-way valve 14 to open and the first outlet to close, so that the solar working fluid circulates in the second heat exchange channel to heat the water in the second water supply channel. When the water in the second water supply channel circulates with the water in the heating coil of the heating device 20, the user's heating demand can be realized.

[0070] Further, in Step S200, it also includes: when the difference between the temperature T1 of the water in the first water supply channel and the temperature T3 of the solar working fluid circulating in the first heat exchange channel is less than the first preset minimum difference T03, the auxiliary heat collection device 2 is started; when the difference between the temperature T1 of the water in the first water supply channel and the temperature T3 of the solar working fluid circulating in the first heat exchange channel is greater than the first preset maximum difference T04, the auxiliary heat collection device 2 is closed; where T03 < T04.

[0071] Specifically, a third temperature sensor is also provided at the solar high-temperature working fluid pipeline 13, and the third temperature sensor is used to detect the temperature T3 of the solar working fluid in the solar high-temperature working fluid pipeline 13. When T1 < T03, it indicates that the temperature T3 of the solar working fluid in the solar high-temperature working fluid pipeline 13 is not high at this time. In other words, the solar energy is insufficient at this time. To meet the user's demand for hot water, the auxiliary heat collection device 2 is started to assist in heating the water in the first water supply flow channel. Additionally, in this case, the first circulation pump 15 can be turned off to stop the circulation of the solar working fluid, so as to rapidly increase the temperature of the solar working fluid in the solar high-temperature working fluid pipeline 13. When T1 > T04, it indicates that the temperature T3 of the solar working fluid in the solar high-temperature working fluid pipeline 13 is relatively high at this time. To save energy consumption, the auxiliary heat collection device 2 can be turned off.

[0072] Optionally, in step S200, regardless of whether the solar heat collection device 1 or the auxiliary heat collection device 2 is used as the heating source to heat the water in the first water supply flow channel, when the temperature T1 of the water in the first water supply flow channel reaches the first preset maximum temperature T01', neither the solar heat collection device 1 nor the auxiliary heat collection device 2 supplies heat to the first water supply flow channel anymore. The first temperature sensor monitors the temperature T1 of the water in the hot water storage tank in real time. When T1 ≤ T01, the first circulation pump 15 or the auxiliary heat collection device 2 is started again as needed.

[0073] In this embodiment, T01 = T01' - 5°C. Of course, in other embodiments, designers can adjust the values of T01 and T01' according to the usage scenario of this heating and water supply system, and this embodiment does not limit this.

[0074] Similarly, step S300 also includes: when the difference between the temperature T2 of the water in the second water supply flow channel and the temperature T3 of the solar working fluid circulating in the second heat exchange flow channel is less than the second preset minimum difference T05, the auxiliary heat collection device 2 is started; when the difference between the temperature T2 of the water in the second water supply flow channel and the temperature T3 of the solar working fluid circulating in the second heat exchange flow channel is greater than the second preset maximum difference T06, the auxiliary heat collection device 2 is turned off; where T05 < T06.

[0075] Specifically, when T2 < T05, it indicates that the temperature T3 of the solar energy working medium in the solar high-temperature working medium pipeline 13 is not high at this time. In other words, the solar energy is insufficient at this time. To meet the heating demand of users, the auxiliary heat collection device 2 is started to assist in heating the water in the second water supply flow channel. Additionally, in this case, the first circulation pump 15 can be turned off to stop the circulation of the solar energy working medium, so as to rapidly increase the temperature of the solar energy working medium in the solar high-temperature working medium pipeline 13. When T2 > T06, it indicates that the temperature T3 of the solar energy working medium in the solar high-temperature working medium pipeline 13 is relatively high. To save energy consumption, the auxiliary heat collection device 2 can be turned off.

[0076] Optionally, in step S300, whether the solar heat collection device 1 or the auxiliary heat collection device 2 is used as the heat source to heat the water in the second water supply flow channel, when the temperature T1 of the water in the second water supply flow channel reaches the second preset maximum temperature T02', neither the solar heat collection device 1 nor the auxiliary heat collection device 2 supplies heat to the second water supply flow channel any more. The second temperature sensor continuously monitors the temperature T2 of the water in the second water supply flow channel. When T2 ≤ T02', the first circulation pump 15 or the auxiliary heat collection device 2 is started according to the need.

[0077] In this embodiment, T02 = T02' - 5°C. Of course, in other embodiments, designers can adjust the values of T02 and T02' according to the usage scenario of this heat supply and water supply system, and this embodiment does not limit this.

[0078] This heat supply and water supply control method further includes: when the temperature T4 of the water in the water supply pipeline between the first water supply flow channel and the water-using device 10 is less than the third preset minimum temperature T07, the circulation pipeline 33 is opened.

[0079] Specifically, a fourth temperature sensor is further provided at the first water supply pipeline 31 and / or the second branch 322. The fourth temperature sensor is used to detect the temperature T4 of the first water supply pipeline 31 and / or the second branch 322. When T4 < T07, it indicates that the temperature of the water near the inlet of the water-using device 10 is relatively low at this time. To prevent the water flowing out at the initial stage when the user turns on the water-using device 10 from being cold water, the control module can control the second circulation pump 331 to turn on, so that the water in the first water supply pipeline 31 and / or the second branch 322 circulates with the water in the hot water storage tank, ensuring that the water in the hot water storage tank is always within the preset temperature range.

[0080] It should be noted that this embodiment does not limit the specific values of T03 to T07, and designers can adjust them according to the actual usage scenario.

[0081] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A heating and water supply system, characterized in that, Comprising: A solar heat collection device (1), including a low-temperature working medium inlet and a high-temperature working medium outlet; An auxiliary heat collection device (2), the outlet end of which is used to connect the water inlet of the water-using device (10) and the water inlet of the heating device (20); A first heat storage device (3), including a first heat exchange flow channel and a first water supply flow channel that cooperate in heat exchange. The first heat exchange flow channel is respectively communicated with the low-temperature working medium inlet and the high-temperature working medium outlet to form a first circulation loop. One end of the first water supply flow channel is communicated with an external water source, and the other end is respectively communicated with the water inlet of the water-using device (10) and the inlet of the auxiliary heat collection device (2); A second heat storage device (4), including a second heat exchange flow channel and a second water supply flow channel that cooperate in heat exchange. The second heat exchange flow channel is respectively communicated with the low-temperature working medium inlet and the high-temperature working medium outlet to form a second circulation loop. One end of the second water supply flow channel is used to communicate with the water outlet of the heating device (20), and the other end is used to communicate with the inlet of the auxiliary heat collection device (2).

2. The heating and water supply system according to claim 1, wherein The solar heat collection device (1) further includes a three-way valve (14). The inlet of the three-way valve (14) is connected to the high-temperature working medium outlet. The first outlet of the three-way valve (14) is communicated with the inlet of the first heat exchange flow channel, and the second outlet of the three-way valve (14) is communicated with the inlet of the second heat exchange flow channel.

3. The heat supply and water supply system according to claim 1, characterized in that The first water supply flow channel includes: A hot water storage tank, which is provided with a first water outlet and a second water outlet; A first water supply pipeline (31), both ends of the first water supply pipeline (31) are respectively communicated with the second water outlet and the water inlet of the water-using device (10); A second water supply pipeline (32), including a first branch (321) and a second branch (322). Both ends of the first branch (321) are respectively communicated with the first water outlet and the inlet of the auxiliary heat collection device (2). Both ends of the second branch (322) are respectively communicated with the outlet of the auxiliary heat collection device (2) and the water inlet of the water-using device (10).

4. The heat supply and water supply system according to claim 3, characterized in that, The first water supply flow channel further includes a circulation pipeline (33), both ends of the circulation pipeline (33) are respectively communicated with the hot water storage tank and a position of the first water supply pipeline (31) close to the water-using device (10); and / or The first heat storage device (3) further includes a circulation pipeline (33), both ends of the circulation pipeline (33) are respectively communicated with the hot water storage tank and a position of the second branch (322) close to the water-using device (10).

5. The heating and water supply system according to claim 1, characterized in that, The number of the first heat storage devices (3) is at least two, and at least two of the first heat storage devices (3) are connected in series in sequence; and / or The number of the second heat storage devices (4) is at least two, and at least two of the second heat storage devices (4) are connected in series in sequence.

6. The heating and water supply system according to claim 1, characterized in that, The auxiliary heat collection device (2) is a gas furnace or an oil furnace; or the auxiliary heat collection device (2) is a gas and oil combined heating furnace.

7. A heating and water supply control method, based on the heating and water supply system according to any one of claims 1-6, characterized in that, The heat supply and water supply control method includes the following steps: Step S100: Read the working mode selected by the user. In the hot water mode, execute step S200; in the heating mode, execute steps S200 to S300 in sequence; Step S200: Determine whether the temperature T1 of the water in the first water supply flow channel is less than the first preset minimum temperature T01. If so, the solar working fluid circulates in the first heat exchange flow channel to heat the water in the first water supply flow channel; Step S300: Determine whether the temperature T1 of the water in the first water supply flow channel is greater than or equal to the first preset maximum temperature T01'. If so, execute Step S301; Step S301: Determine whether the temperature T2 of the water in the second water supply flow channel is less than the second preset minimum temperature T02. If so, the solar working fluid circulates in the second heat exchange flow channel to heat the water in the second water supply flow channel.

8. The heating and water supply control method according to claim 7, wherein In the said Step S200, it also includes: When the difference between the temperature T1 of the water in the first water supply flow channel and the temperature T3 of the solar working fluid circulating in the first heat exchange flow channel is less than the first preset minimum difference T03, the auxiliary heat collection device (2) is started; When the difference between the temperature T1 of the water in the first water supply flow channel and the temperature T3 of the solar working fluid circulating in the first heat exchange flow channel is greater than the first preset maximum difference T04, the auxiliary heat collection device (2) is closed; wherein, T03 < T04.

9. The heat supply and water supply control method according to claim 7, wherein In the said Step S300, it also includes: When the difference between the temperature T2 of the water in the second water supply flow channel and the temperature T3 of the solar working fluid circulating in the second heat exchange flow channel is less than the second preset minimum difference T05, the auxiliary heat collection device (2) is started; When the difference between the temperature T2 of the water in the second water supply flow channel and the temperature T3 of the solar working fluid circulating in the second heat exchange flow channel is greater than the second preset maximum difference T06, the auxiliary heat collection device (2) is closed; wherein, T05 < T06.

10. The heating and water supply control method according to any one of claims 7-9, characterized in that, The said heat supply and water supply control method also includes: when the temperature T4 of the water in the water supply pipeline between the first water supply flow channel and the water-using device (10) is less than the third preset minimum temperature T07, the circulation pipeline (33) is opened.

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