Solar heating system and its control method

Abstract

The present application provides a solar heating system and a control method thereof. The system includes a solar heat collection device, a first water storage device, a second water storage device, an electricity storage device, a water circulation device, and a water diversion pipe; the first water storage device is connected to the water circulation device through a first water pipe, and a first solenoid valve is installed at the water outlet of the first water storage device; the second water storage device is connected to the first water pipe, a second solenoid valve is installed at the water outlet of the first water storage device, and a third solenoid valve is installed on the first water pipe; the water diversion pipe is provided with a partition portion, and the water diversion pipe forms two channels through the partition portion; the water diversion pipe is connected to the first water pipe; the electricity storage device is respectively connected to the solar heat collection device, the first water storage device, the second water storage device, and the water circulation device. By adding a water circulation device at the end of the water path, recovering the cold water in the pipeline, and improving the recovery efficiency of the branch pipeline through a specially designed water diversion pipe, the synchronous improvement of water use comfort and resource efficiency is realized.

Description

Technical Field

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

[0002] In the design of the hot water pipeline system for home decoration, when the distance between the hot water supply end and the water using terminal is long, the problem of cold water retention in the pipeline will occur. The specific manifestations are as follows: When the user intermittently uses hot water, the hot water remaining in the pipeline gradually cools to the ambient temperature due to natural heat dissipation, forming an ineffective cold water section. When the hot water is used again, the user needs to continuously discharge the cold water accumulated in the pipeline (about 1 - 5 minutes) to obtain effective hot water. This phenomenon not only causes waste of water resources, but also directly affects the immediacy and comfort of hot water use. How to optimize the design of the hot water pipeline system to reduce water resource waste and improve the user experience has become a key technical issue in the field of home decoration. Summary of the Invention

[0003] On the one hand, the present invention provides a solar heating system, mainly including:

[0004] A solar heat collection device, a first water storage device, a second water storage device, a power storage device, a water circulation device, and a water diversion pipe;

[0005] The first water storage device is connected to the water circulation device through a first water pipe, and a first solenoid valve is installed at the water outlet of the first water storage device;

[0006] The second water storage device is connected to the first water pipe, a second solenoid valve is installed at the water outlet of the first water storage device, and a third solenoid valve is installed on the first water pipe;

[0007] The water diversion pipe is provided with a partition portion, and the water diversion pipe forms two channels through the partition portion; the water diversion pipe is connected to the first water pipe;

[0008] The power storage device is respectively connected to the solar heat collection device, the first water storage device, the second water storage device, and the water circulation device;

[0009] The water circulation device is provided with a first temperature sensor, and the water diversion pipe is provided with a second temperature sensor.

[0010] On the other hand, the present invention also provides a control method for a solar heating system, mainly including:

[0011] Switching to the hot water supply mode or the preheating mode;

[0012] The preheating mode includes:

[0013] Monitor the water temperature k1 of the water circulation device, the water temperature k2 of the second water storage device, and the water temperature k3 of the water diversion pipe. When k2 - (k1 + k3) / 2 ≥ 3°C, close the first solenoid valve, open the second solenoid valve, open the third solenoid valve, and start the water circulation device; when k2 - (k1 + k3) / 2 < 3°C, close the first solenoid valve and close the second solenoid valve.

[0014] Monitor the power C of the electricity storage device. When receiving an instruction to switch the mode, or when the power C reaches 10%, or when the preset time is reached, switch to the hot water supply mode.

[0015] The hot water supply mode includes:

[0016] Open the first solenoid valve, close the second solenoid valve, and turn off the water circulation device.

[0017] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0018] By adding a water circulation device at the end of the water circuit, recycling the cold water in the pipeline, and improving the recycling efficiency of the branch pipeline through a specially designed water diversion pipe, the water use comfort and resource efficiency are synchronously improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a solar heating system of the present invention;

[0020] Figure 2 It is a cross-sectional view of a water diversion pipe of the present invention;

[0021] Figure 3 It is a cross-sectional view of another water diversion pipe of the present invention.

[0022] REFERENCE SIGNS

[0023] 1. First water storage device; 2. Second water storage device; 3. Water circulation device; 4. Water diversion pipe;

[0024] 41. Partition part; 42. First pipe orifice; 43. Second pipe orifice; 44. Third pipe orifice;

[0025] 5. Third water storage device; 61. First temperature sensor; 62. Second temperature sensor; 63. Third temperature sensor; 64. Fourth temperature sensor; 65. Fifth temperature sensor; 7. Heating device; 81. First solenoid valve; 82. Second solenoid valve; 83. Third solenoid valve; 84. Fourth solenoid valve; 85. Fifth solenoid valve; 91. First water pipe; 92. Second water pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this specification without creative efforts shall fall within the scope of protection of this specification.

[0027] See Figures 1 - 3 , this embodiment provides a solar heating system, specifically including a solar heat collection device, a first water storage device 1, a second water storage device 2, an electricity storage device, a water circulation device 3, and a water diversion pipe 4; the first water storage device 1 is connected to the water circulation device 3 through a first water pipe 91, and a first solenoid valve 81 is installed at the water outlet of the first water storage device 1; the second water storage device 2 is connected to the first water pipe 91, a second solenoid valve 82 is installed at the water outlet of the first water storage device 1, and a third solenoid valve 83 is installed on the first water pipe 91; the water diversion pipe 4 is provided with a partition part 41, and the water diversion pipe 4 forms two channels through the partition part 41; the water diversion pipe 4 is connected to the first water pipe 91; the electricity storage device is respectively connected to the solar heat collection device, the first water storage device 1, the second water storage device 2, and the water circulation device 3; the water circulation device 3 is provided with a first temperature sensor 61, and the water diversion pipe 4 is provided with a second temperature sensor 62.

[0028] In this embodiment, both the first water storage device 1 and the second water storage device 2 are water storage tanks with a heating function. The water circulation device 3 includes a water pump for circulating the fluid in the pipeline to achieve the transportation of the fluid. Water using devices, such as faucets, shower heads, etc., are installed at the end of the water diversion pipe 4. The solar heat collection device includes a solar panel and an inverter. The solar panel is used to collect heat energy and convert it into direct current electricity, and the inverter is used to convert the direct current electricity output by the solar panel into alternating current electricity. The electricity storage device includes a storage battery for storing the electricity output by the solar heat collection device. A partition part 41 is installed inside the water diversion pipe 4, and the inside of the water diversion pipe 4 is divided into two channels through the partition part 41. A first temperature sensor 61 is installed at the water inlet of the water circulation device 3, and a second temperature sensor 62 is installed at the end of at least one of the water diversion pipes 4. The water temperature in the pipeline is estimated through the readings of the first temperature sensor 61 and the second temperature sensor 62. When the water temperature is lower than the threshold, the preheating mode is started.

[0029] In specific implementation, 26°C is the comfortable temperature for human contact, and 45°C is the common temperature for household water use (such as bathing, etc.). The first water storage device 1 is powered on and heated to maintain the water temperature at about 50°C, and the second water storage device 2 is powered on and heated to maintain the water temperature at about 25°C. The split water pipe 4 is formed into two channels by the partition part 41. The 25°C warm water of the second water storage device 2 is transported to the water circulation device 3 through the first water pipe 91. A plurality of split water pipes 4 are installed on the first water pipe 91. The warm water enters the first channel of the split water pipe 4 and reaches the end of the split water pipe 4 along the first channel, and then enters the second channel at the end of the split water pipe 4 and reaches the beginning of the split water pipe 4 along the second channel to realize preheating of the branch water pipes. Among them, the smaller the thickness of the partition part 41, the higher the efficiency of the hot water in the first channel transferring heat to the second channel through the partition part 41, and the higher the preheating efficiency of the split water pipe 4. The first water storage device 1 and the second water storage device 2 are respectively connected to the household pipeline. Water is supplied to the first water storage device 1 and the second water storage device 2 through the household pipeline, and then heated by the first water storage device 1 and the second water storage device 2, and hot water is supplied to the first water pipe 91, the split water pipe 4 and the water using equipment. The cooling water in the first water pipe 91 and the split water pipe 4 is recovered by the water circulation device 3 and transported to the first water storage device 1 and the second water storage device 2 for heating to realize hot water circulation.

[0030] Continue to refer to Figures 1 - 3 For the solar heating system provided in this embodiment, the split water pipe 4 further includes a first pipe orifice 42, a second pipe orifice 43, and a third pipe orifice 44; the first pipe orifice 42 is connected to the first water pipe 91, the second pipe orifice 43 is connected to the water circulation device 3, and the third pipe orifice 44 is connected to a stop valve; the partition part 41 is arranged from the first pipe orifice 42 to the third pipe orifice 44.

[0031] In this embodiment, the hot water of the first water storage device 1 and / or the second water storage device 2 enters the split water pipe 4 from the first pipe orifice 42 of the first water pipe 91, the second pipe orifice 43 leads to the water circulation device 3, and the third pipe orifice 44 is connected to a stop valve, and the stop valve includes a faucet.

[0032] Furthermore, the solar heating system further includes a third water storage device 5, and a fourth solenoid valve 84 is installed at the water inlet of the third water storage device 5, and the third water storage device 5 is connected to the water circulation device 3.

[0033] Specifically, the third water storage device 5 includes a water storage tank. A fourth solenoid valve 84 is installed at the water inlet of the third water storage device 5. When the pipeline is in the preheating mode, the fourth solenoid valve 84 is opened, and the water circulation device 3 is started. The cold water remaining in the pipeline is driven by the water circulation device 3 and discharged into the third water storage device 5. In this embodiment, a water pump is also installed at the water outlet of the third water storage device 5. The water outlet of the third water storage device 5 is respectively connected to the first water storage device 1 and the second water storage device 2. When the water storage volume of the third water storage device 5 reaches a preset threshold, the water pump is started again to avoid wasting electric energy due to continuous operation of the water pump.

[0034] Further, the solar heating system further includes a third temperature sensor 63, a fourth temperature sensor 64, and a fifth temperature sensor 65; the third temperature sensor 63 is arranged in the first water storage device 1 for monitoring the water temperature of the first water storage device 1; the fourth temperature sensor 64 is arranged in the second water storage device 2 for monitoring the water temperature of the second water storage device 2; the fifth temperature sensor 65 is arranged in the third water storage device 5 for monitoring the water temperature of the third water storage device 5.

[0035] Specifically, the third temperature sensor 63 is used to monitor the water temperature of the first water storage device 1. The temperature preset value of the first water storage device 1 is 45 °C, which is used to provide domestic water; the fourth temperature sensor 64 is used to monitor the water temperature of the second water storage device 2. The temperature preset value of the second water storage device 2 is 25 °C, which is used to provide pipeline preheating; the fifth temperature sensor 65 is used to monitor the water temperature of the third water storage device 5. In this embodiment, the third water storage device 5 is used to store the cold water discharged from the pipeline. A water pump is installed at the water outlet of the third water storage device 5, and the water in the third water storage device 5 is transported to the cold water system through the water pump.

[0036] In one embodiment, the water circulation device 3 includes a two-way water pump. The third water storage device 5 is connected to the two-way water pump, so that the third water storage device 5 can store the cold water discharged from the pipeline, and the water in the third water storage device 5 can also be transported to the pipeline through the water circulation device 3 for users to use as a standby water storage tank.

[0037] Further, the solar heating system further includes a heating device 7. The heating device 7 is respectively connected to the second water storage device 2 and the first water pipe 91 through a second water pipe 92. A fifth solenoid valve 85 is provided on the third water pipe.

[0038] Specifically, the heating device 7 includes a radiator, radiator panels, and a heating circulation pump. In this embodiment, the fifth solenoid valve 85 is used to control the connection / cut-off between the heating device 7 and the second water storage device 2. Generally, the preset temperature value of the radiator panels is 23°C. When the fifth solenoid valve 85 is opened, warm water at about 25°C stored in the second water storage device 2 is continuously supplied to the radiator panels. The radiator panels dissipate the heat of the warm water to achieve indoor heating, and the water after heat dissipation is transported to the first water storage device 1 and / or the second water storage device 2 through the heating circulation pump connected to the radiator panels. In some other embodiments, the heating device 7 is connected to a cold water system, and the water after heat dissipation is transported to the cold water system through the heating circulation pump connected to the radiator panels.

[0039] Further, the lowest temperature preset value Q1 of the first water storage device 1 and the highest temperature preset value Q2 of the second water storage device 2 satisfy Q1 ≥ Q2.

[0040] Moreover, a heat insulation material layer is provided on the periphery of the first water storage device 1.

[0041] Specifically, the first water storage device 1 is used to store domestic water (usually at 40°C - 60°C), and the second water storage device 2 is used to store preheated water (usually at 20°C - 30°C). A heat insulation material layer is installed on the periphery of the first water storage device 1 to reduce the heat loss of the first water storage device 1. The lowest temperature preset value is the critical value for the water storage device to perform the heating operation. For example, the lowest temperature preset value of the first water storage device 1 is 40°C. When the water temperature of the first water storage device 1 is lower than 40°C, the first water storage device 1 performs the heating operation. The highest temperature preset value is the critical value for the water storage device to stop the heating operation. For example, the highest temperature preset value of the second water storage device 2 is 30°C. When the water temperature of the second water storage device 2 reaches 30°C, the second water storage device 2 stops the heating operation.

[0042] In one embodiment, the priority of power distribution is: equipment power consumption > power consumption of the second water storage device 2 > power consumption of the first water storage device 1. The electric energy obtained by the solar heat collection device preferentially satisfies the equipment power consumption of the user and the heating power consumption of the second water storage device 2. The second water storage device 2 continuously supplies warm water, avoiding the phenomenon of sudden water temperature change that is likely to occur when the user adjusts the mixing faucet, and improving the user's water use comfort.

[0043] This embodiment also provides a control method for a solar heating system, specifically including the steps of: switching to the hot water supply mode or the preheating mode.

[0044] The preheating mode includes:

[0045] Monitor the water temperature k1 of the water circulation device 3, monitor the water temperature k2 of the second water storage device 2, monitor the water temperature k3 of the water diversion pipe 4. When k2 - (k1 + k3) / 2 ≥ 3°C, close the first solenoid valve 81, open the second solenoid valve 82, open the third solenoid valve 83, and start the water circulation device 3; when k2 - (k1 + k3) / 2 < 3°C, close the first solenoid valve 81 and close the second solenoid valve 82.

[0046] Monitor the power C of the energy storage device. When receiving an instruction to switch the mode, or when the power C reaches 10%, or when a preset time is reached, switch to the hot water supply mode.

[0047] Specifically, the solar heating system includes a wireless communication module and a display module. The wireless communication module includes wifi, Bluetooth, etc. The display module includes a human-computer interaction display screen. The user can input instructions through the wireless communication module or the display module, and then switch to the preheating mode or the hot water supply mode.

[0048] In an embodiment, the first water pipe 91 is connected with a plurality of water diversion pipes 4. At least one water diversion pipe 4 is provided with a temperature sensor. Denote the number of temperature sensors on the water diversion pipe 4 as n, the readings of the temperature sensors on the water diversion pipe 4 as t1~tn, the water temperature at the inlet of the water circulation device 3 as k1, and the water temperature of the second water storage device 2 as k2. When k2 - (k1 + t1 + t2... + tn) / (n + 1) ≥ 3°C, it is determined that the water temperature in the pipeline is lower than the water temperature k2. Close the first solenoid valve 81, open the second solenoid valve 82, open the third solenoid valve 83, and start the water circulation device 3 to realize the delivery of warm water from the second water storage device 2 to the pipeline; when k2 - (k1 + t1 + t2... + tn) / (n + 1) < 3°C, it is determined that the pipeline has completed preheating, close the first solenoid valve 81 and close the second solenoid valve 82.

[0049] The hot water supply mode includes:

[0050] Open the first solenoid valve 81, close the second solenoid valve 82, and close the water circulation device 3.

[0051] Specifically, the first water storage device 1 is communicated with the pipeline for the user to use the hot water in the first water storage device 1.

[0052] In an embodiment, the hot water supply mode further includes:

[0053] Monitor the water temperature k1 of the second water storage device 2. When k1 < Q3, open the third solenoid valve 83 and open the fifth solenoid valve 85; when k1 ≥ Q3, close the third solenoid valve 83, open the second solenoid valve 82, and open the fifth solenoid valve 85; Q3 is the preset minimum temperature value of the second water storage device 2.

[0054] Specifically, the electric energy obtained by the solar heat collection device is preferentially allocated to heat the second water storage device 2. When the water temperature k1 of the second water storage device 2 is less than the preset minimum temperature value of the second water storage device 2, it is determined that the electric energy obtained by the solar heat collection device has been exhausted, and the preheating mode is stopped to save electricity for the user.

[0055] In an embodiment, the control method of the solar heating system further includes the step of monitoring the water volume P stored in the third water storage device 5. When P > 90%, the water pump at the water outlet of the third water storage device 5 is started.

[0056] Specifically, the third water storage device 5 is used to store water. The third water storage device 5 is equipped with a liquid level gauge, and a water pump is installed at the water outlet of the third water storage device 5. The water surface height in the third water storage device 5 is measured by the liquid level gauge. When the water surface height reaches 90%, the water pump at the water outlet of the third water storage device 5 is started, and the water in the third water storage device 5 is circulated in the pipeline through the water pump.

[0057] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for a solar heating system, characterized in that the solar heating system includes: a solar heat collection device, a first water storage device, a second water storage device, a power storage device, a water circulation device, and a water diversion pipe; the first water storage device is connected to the water circulation device through a first water pipe, and a first solenoid valve is installed at the water outlet of the first water storage device; the second water storage device is connected to the first water pipe, a second solenoid valve is installed at the water outlet of the second water storage device, and a third solenoid valve is installed on the first water pipe; the water diversion pipe is provided with a partition part, and the water diversion pipe forms two channels through the partition part; the water diversion pipe is connected to the first water pipe; the power storage device is respectively connected to the solar heat collection device, the first water storage device, the second water storage device, and the water circulation device; the water circulation device is provided with a first temperature sensor, and the water diversion pipe is provided with a second temperature sensor; the water diversion pipe further includes a first pipe orifice, a second pipe orifice, and a third pipe orifice; the first pipe orifice is connected to the first water pipe, the second pipe orifice is connected to the water circulation device, and the third pipe orifice is connected to a stop valve; the partition part is arranged from the first pipe orifice to the third pipe orifice; it further includes a third water storage device, a fourth solenoid valve is installed at the water inlet of the third water storage device, and the third water storage device is connected to the water circulation device; it further includes a heating device, the heating device is respectively connected to the second water storage device and the first water pipe through a second water pipe, and a fifth solenoid valve is provided on the second water pipe; the control method of this solar heating system includes: switching to the hot water supply mode or the preheating mode; the preheating mode includes: monitoring the water temperature k1 of the water circulation device, monitoring the water temperature k2 of the second water storage device, monitoring the water temperature k3 of the water diversion pipe. When k2 - (k1 + k3) / 2 ≥ 3°C, close the first solenoid valve, open the second solenoid valve, open the third solenoid valve, and start the water circulation device; when k2 - (k1 + k3) / 2 < 3°C, close the first solenoid valve and close the second solenoid valve; monitoring the power C of the power storage device. When receiving an instruction to switch the mode, or when the power C reaches 10%, or when reaching a preset time, switch to the hot water supply mode; the hot water supply mode includes: open the first solenoid valve, close the second solenoid valve, and close the water circulation device.

2. The control method of the solar heating system according to claim 1, characterized in that, the solar heating system further includes a third temperature sensor, a fourth temperature sensor, and a fifth temperature sensor; the third temperature sensor is arranged inside the first water storage device for monitoring the water temperature of the first water storage device; the fourth temperature sensor is arranged inside the second water storage device for monitoring the water temperature of the second water storage device; the fifth temperature sensor is arranged inside the third water storage device for monitoring the water temperature of the third water storage device.

3. The control method of the solar heating system according to claim 1, characterized in that a minimum temperature preset value Q1 of the first water storage device, a maximum temperature preset value Q2 of the second water storage device, Q1 ≥ Q2.

4. The control method of the solar heating system according to claim 3, wherein a heat insulation material layer is provided on the periphery of the first water storage device.

5. The control method of the solar heating system according to claim 1, characterized in that, the hot water supply mode further includes: Monitor the water temperature k2 of the second water storage device. When k2 < Q3, open the third solenoid valve and the fifth solenoid valve; when k2 ≥ Q3, close the third solenoid valve, open the second solenoid valve, and open the fifth solenoid valve; Q3 is the preset minimum temperature value of the second water storage device.

6. The control method of the solar heating system according to claim 5, wherein It further includes: Monitor the water volume P stored in the third water storage device. When P > 90%, start the water pump at the outlet of the third water storage device.

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