Solar water heating device with temperature-controllable photovoltaic power generation structure

Abstract

The invention belongs to the technical field of photovoltaic power generation and solar resource utilization, and particularly relates to a solar water heating device with a temperature-controllable photovoltaic power generation structure. Comprising a solar water storage tank, a power generation and heat collection duplex assembly, a circulating temperature control pipe set, a tap water inlet pipeline, a solar water storage tank water outlet pipeline and a water pump. The power generation and heat collection duplex assembly comprises a solar energy heat collection pipe set and a photovoltaic power generation plate, and further comprises a first temperature sensor and a third temperature sensor. By combining the functions of the photovoltaic power generation device and the solar water heater, full utilization of resources is achieved, meanwhile, a photovoltaic power generation panel temperature control structure is established through the solar water heater and a water supply circulation loop of tap water, and the photovoltaic power generation device is kept near the optimal working temperature in the using process; the device can operate at the highest efficiency in different environments such as low temperature or high temperature, the energy utilization efficiency of the device is improved, and the applicable area of photovoltaic power generation is expanded.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic power generation and solar energy resource utilization, and in particular relates to a solar water heating device with a temperature-controllable photovoltaic power generation structure. Background Art

[0002] Photovoltaic power generation is a widely used type of clean energy. Photovoltaic power generation has no risk of energy depletion, is safe and reliable to use, has no noise, and is not restricted by the geographical distribution of resources. It is an effective means to meet the electricity demand in energy-deficient areas. Solar water heaters are also a common renewable energy utilization device in similar areas. Since the operating efficiency of solar panels is greatly affected by temperature, and their use and maintenance costs are relatively high, and both require large rooftops and other free areas, solar water heaters are currently more widely promoted and applied in rural areas. In limited available space, if the advantages of both can be combined and the temperature and maintenance problems of solar power generation can be solved, it will be conducive to further promoting the application of both. Summary of the invention

[0003] The purpose of the present invention is to provide a solar water heater that combines photovoltaic power generation and solar water heaters based on actual needs, which maintains the ideal operating temperature of the solar panel at 25°C±2°C through the heat cycle of the solar water heater, realizes temperature regulation at low temperatures, and simultaneously recovers the heat generated in the solar photovoltaic power generation process at high temperatures, thereby maintaining the high power generation efficiency of the photovoltaic module and making full use of solar energy resources. A solar water heater device with a temperature-controllable photovoltaic power generation structure.

[0004] To achieve the above purpose, the present invention adopts the following technical solution.

[0005] A solar water heating device with a temperature-controllable photovoltaic power generation structure, comprising a solar water storage tank 1, a power generation and heat collection dual assembly 2, a circulating temperature control pipe group L6, a tap water inlet pipeline L1, a solar water storage tank outlet pipeline L2, and a water pump 3;

[0006] The power generation and heat collection dual assembly 2 comprises: a solar heat collection tube 20 tube group located on the top layer, and a photovoltaic power generation plate 21 located on the back side of the solar heat collection tube 20 tube group, and the hot end of the solar heat collection tube 20 extends into the solar water storage tank 1;

[0007] The circulating temperature control pipe group L6 is evenly laid on the back side of the photovoltaic power generation plate 21, and the water outlet of the circulating temperature control pipe group L6 is connected to the solar water storage tank 1;

[0008] The tap water inlet pipe L1 is introduced from the tap water supply port, and its outlet side forms two branches, including: a water replenishment pipe L0 connected to the water inlet of the water pump 3 through the first solenoid valve K1, connected to the first water supply pipe L4 connected to the water inlet of the water pump 3 through the second solenoid valve K2; a mixed temperature control pipe L7 connected from the water outlet of the water pump 3 to the water inlet of the circulating temperature control pipe group L6;

[0009] The solar water tank outlet pipe L2 is led out from the solar water tank 1, and its outlet side forms two branches, including: a high-temperature water outlet pipe connected to the household water tank, and a second water supply pipe L5 connected to the water inlet of the circulating temperature control pipe group L6 through the third solenoid valve K3;

[0010] It also includes: a first temperature sensor P1 for monitoring the temperature of tap water supply, and a third temperature sensor P3 for monitoring the surface temperature of the photovoltaic power generation panel 21;

[0011] The controller is further included, and the controller monitors the tap water supply temperature based on the first temperature sensor P1, monitors the surface temperature of the photovoltaic power generation panel 21 based on the third temperature sensor P3, controls the opening size of each solenoid valve and the start and stop of the water pump 3, and specifically includes the following steps:

[0012] S1. When the temperature T3 measured by the third temperature sensor P3 is monitored to be ≤23°C, start the water pump 3, open the second solenoid valve K2 and the third solenoid valve K3 to supply water according to the preset flow ratio, and maintain for 60 seconds;

[0013] When the temperature T3 measured by the third temperature sensor P3 is monitored to be ≥27°C, the water pump is started, the third solenoid valve K3 is closed, and the second solenoid valve K2 is opened to the maximum and maintained for 60 seconds;

[0014] S2, monitoring the temperature T3 measured by the third temperature sensor P3 every 60 seconds;

[0015] If T3≤23℃, increase the flow rate of the third solenoid valve K3 and reduce the flow rate of the second solenoid valve K2. If 27℃≤T3≤30℃, increase the flow rate of the third solenoid valve K3 and reduce the flow rate of the second solenoid valve K2. Keep the flow rate for 60s after each adjustment until 23℃≤T3≤27℃. Keep the current flow rate ratio unchanged. After keeping the flow rate for 60s, turn off the water pump 3 or maintain low power operation.

[0016] If T3 ≥ 30°C, close the third solenoid valve K3, open the second solenoid valve K2 to the maximum, keep it for 60 seconds, until 23°C ≤ T3 ≤ 27°C, keep it for 60 seconds, and turn off the water pump 3 or maintain low power operation;

[0017] The above steps are repeated to maintain the temperature measured by the third temperature sensor P3 to satisfy 23°C ≤ T3 ≤ 27°C.

[0018] In a further improvement or preferred embodiment of the aforementioned solar water heating device with a temperature-controllable photovoltaic power generation structure, the preset flow ratio is determined based on the following method:

[0019] The average outlet water temperature T0 (°C) of the solar water heater and the tap water supply temperature T0′ (°C) at the same historical time node are obtained, and the initial flow rate Q2 of the second solenoid valve K2 and the initial flow rate Q3 of the third solenoid valve K3 are controlled to satisfy: Q2*T0′+Q3*T0=(Q2+Q3)(25+k); wherein 0≤k≤5 is the pipeline insulation coefficient. If the total length of the pipeline is shorter and the insulation effect is better, k is smaller, and vice versa.

[0020] A further improvement or preferred embodiment of the aforementioned solar water heating device with a temperature-controllable photovoltaic power generation structure further includes a second temperature sensor P2 provided on the mixed thermostatic pipeline L7; the controller is also used to: periodically monitor the outlet water temperature of the mixed thermostatic pipeline L7 based on the second temperature sensor P2, and during the process of adjusting the opening of each solenoid valve and starting and stopping the water pump 3, if the outlet water temperature T2 of the thermostatic pipeline L7 is monitored to be ≤25°C, then adjust the flow adjustment amount ΔQ of the third solenoid valve K3 each time and the flow adjustment amount ΔQ′ of the second solenoid valve K2 each time according to the size of T2, wherein:

[0021] ΔQ=k1Q3, ΔQ′=k2Q2, 0.1≤k2≤k1≤0.5.

[0022] A further improvement or preferred embodiment of the aforementioned solar water heating device with a temperature-controllable photovoltaic power generation structure, the circulating temperature control pipe group L6 refers to an S-shaped multi-loop elbow pipe evenly arranged on the back side of the photovoltaic power generation panel 21.

[0023] A further improvement or preferred embodiment of the aforementioned solar water heating device with a temperature-controllable photovoltaic power generation structure is that the S-shaped multi-circuit elbow is composed of a plurality of horizontal straight pipes and curved pipes connecting the horizontal straight pipes; a sewage pipe head 60 is provided on the bottom horizontal straight pipe of the S-shaped multi-circuit elbow. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the circuit structure of a solar water heating device including a temperature-controllable photovoltaic power generation structure;

[0025] Figure 2 It is a structural schematic diagram of the circulating temperature control tube group. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with specific embodiments.

[0027] The solar water heating device of the present invention, which contains a temperature-controllable photovoltaic power generation structure, is mainly used to provide a comprehensive solar energy resource utilization device. By combining the functions of the photovoltaic power generation device and the solar water heater, full resource utilization is achieved. At the same time, a water supply circulation loop of the solar water heater and tap water is used to establish a photovoltaic power generation panel temperature control structure. During use, the photovoltaic power generation device is maintained near the optimal operating temperature, ensuring that it can operate at the highest efficiency in different environments such as low temperature or high temperature, thereby improving the energy utilization efficiency of the device and expanding the applicable area of ​​photovoltaic power generation.

[0028] like Figure 1 As shown, the main structure of the solar water heating device with temperature-controllable photovoltaic power generation structure of the present application includes a solar water storage tank 1, a power generation and heat collection dual assembly 2, a circulating temperature control pipe group L6, a tap water inlet pipeline L1, a solar water storage tank outlet pipeline L2, and a water pump 3;

[0029] The power generation and heat collection dual assembly 2 includes: a solar heat collection tube 20 tube group located on the top layer, and a photovoltaic power generation plate 21 located on the back side of the solar heat collection tube 20 tube group. The hot end of the solar heat collection tube 20 extends into the solar water storage tank 1.

[0030] The circulating temperature control tube group L6 is evenly laid on the back side of the photovoltaic power generation panel 21, and the water outlet of the circulating temperature control tube group L6 is connected to the solar water storage tank 1. In this embodiment, the circulating temperature control tube group L6 refers to an S-shaped multi-circuit elbow evenly arranged on the back side of the photovoltaic power generation panel 21.

[0031] The S-shaped multi-circuit elbow is composed of a number of horizontal straight pipes and elbows connecting the horizontal straight pipes; a sewage pipe head 60 is arranged on the bottom horizontal straight pipe of the S-shaped multi-circuit elbow.

[0032] The tap water inlet pipe L1 is introduced from the tap water supply port, and its outlet side forms two branches, including: a water replenishment pipe L0 connected to the water inlet of the water pump 3 through the first solenoid valve K1, connected to the first water supply pipe L4 connected to the water inlet of the water pump 3 through the second solenoid valve K2; a mixed temperature control pipe L7 connected from the water outlet of the water pump 3 to the water inlet of the circulating temperature control pipe group L6;

[0033] The solar water tank outlet pipe L2 is led out from the solar water tank 1, and its outlet side forms two branches, including: a high-temperature water outlet pipe connected to the household water tank, and a second water supply pipe L5 connected to the water inlet of the circulating temperature control pipe group L6 through the third solenoid valve K3;

[0034] It also includes: a first temperature sensor P1 for monitoring the temperature of tap water supply, and a third temperature sensor P3 for monitoring the surface temperature of the photovoltaic power generation panel 21;

[0035] It also includes a controller, wherein the controller monitors the tap water supply temperature based on the first temperature sensor P1, monitors the surface temperature of the photovoltaic power generation panel 21 based on the third temperature sensor P3, controls the opening size of each solenoid valve and the start and stop of the water pump 3, and specifically includes the following steps:

[0036] S1. When the temperature T3 measured by the third temperature sensor P3 is monitored to be ≤23°C, start the water pump 3, open the second solenoid valve K2 and the third solenoid valve K3 to supply water according to the preset flow ratio, and maintain for 60 seconds;

[0037] When the temperature T3 measured by the third temperature sensor P3 is monitored to be ≥27°C, the water pump is started, the third solenoid valve K3 is closed, and the second solenoid valve K2 is opened to the maximum and maintained for 60 seconds;

[0038] S2, monitoring the temperature T3 measured by the third temperature sensor P3 every 60 seconds;

[0039] If T3≤23℃, increase the flow rate of the third solenoid valve K3 and reduce the flow rate of the second solenoid valve K2. If 27℃≤T3≤30℃, increase the flow rate of the third solenoid valve K3 and reduce the flow rate of the second solenoid valve K2. Keep the flow rate for 60s after each adjustment until 23℃≤T3≤27℃. Keep the current flow rate ratio unchanged. After keeping the flow rate for 60s, turn off the water pump 3 or maintain low power operation.

[0040] If T3 ≥ 30°C, close the third solenoid valve K3, open the second solenoid valve K2 to the maximum, keep it for 60 seconds, until 23°C ≤ T3 ≤ 27°C, keep it for 60 seconds, and turn off the water pump 3 or maintain low power operation;

[0041] The above steps are repeated to maintain the temperature measured by the third temperature sensor P3 to satisfy 23°C ≤ T3 ≤ 27°C.

[0042] The preset flow ratio is determined based on the following method:

[0043] The average outlet water temperature T0 (°C) of the solar water heater and the tap water supply temperature T0′ (°C) at the same historical time node are obtained, and the initial flow rate Q2 of the second solenoid valve K2 and the initial flow rate Q3 of the third solenoid valve K3 are controlled to satisfy: Q2*T0′+Q3*T0=(Q2+Q3)(25+k); wherein 0≤k≤5 is the pipeline insulation coefficient. If the total length of the pipeline is shorter and the insulation effect is better, k is smaller, and vice versa.

[0044] In order to better adjust the temperature and enhance the level of intelligence, the present embodiment also includes a second temperature sensor P2 provided on the mixed thermostatic pipeline L7; wherein the controller is also used for: periodically monitoring the outlet water temperature of the mixed thermostatic pipeline L7 based on the second temperature sensor P2, during the process of adjusting the opening of each solenoid valve and starting and stopping the water pump 3, if the outlet water temperature T2 of the thermostatic pipeline L7 is monitored to be ≤25°C, then adjusting the flow adjustment amount ΔQ of each time of the third solenoid valve K3 and the flow adjustment amount ΔQ′ of each time of the second solenoid valve K2 according to the size of T2, wherein:

[0045] ΔQ=k1Q3, ΔQ′=k2Q2, 0.1≤k2≤k1≤0.5.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A solar water heating device with a temperature-controllable photovoltaic power generation structure, characterized in that: It comprises a solar water storage tank (1), a power generation and heat collection dual assembly (2), a circulating temperature control pipe group (L6), a tap water inlet pipeline (L1), a solar water storage tank outlet pipeline (L2), and a water pump (3); The power generation and heat collection dual assembly (2) comprises: a solar heat collection tube (20) tube group located on the top layer, and a photovoltaic power generation plate (21) located on the back side of the solar heat collection tube (20) tube group, wherein the hot end of the solar heat collection tube (20) extends into the solar water storage tank (1); The circulating temperature control pipe group (L6) is evenly laid on the back side of the photovoltaic power generation plate (21), and the water outlet of the circulating temperature control pipe group (L6) is connected to the solar water storage tank (1); The tap water inlet pipeline (L1) is introduced from the tap water supply port, and its outlet side forms two branches, including: a water replenishment pipeline (L0) connected to the water inlet of the water pump (3) through a first solenoid valve (K1), connected to the first water supply pipeline (L4) connected to the water inlet of the water pump (3) through a second solenoid valve (K2); and a mixed temperature control pipeline (L7) connected from the water outlet of the water pump (3) to the water inlet of the circulating temperature control pipe group (L6); The solar water tank outlet pipe (L2) is led out from the solar water tank (1), and its outlet side forms two branches, including: a high-temperature water outlet pipe connected to the household water tank, and a second water supply pipe (L5) connected to the water inlet of the circulating temperature control pipe group (L6) via a third solenoid valve (K3); It also includes: a first temperature sensor (P1) for monitoring the temperature of tap water supply, and a third temperature sensor (P3) for monitoring the surface temperature of the photovoltaic power generation panel (21); The system also includes a controller, which monitors the tap water supply temperature based on a first temperature sensor (P1), monitors the surface temperature of the photovoltaic power generation panel (21) based on a third temperature sensor (P3), controls the opening of each solenoid valve and starts and stops the water pump (3), and specifically includes the following steps: S1. When the temperature T3 measured by the third temperature sensor (P3) is detected to be less than or equal to 23°C, the water pump (3) is started, and the second solenoid valve (K2) and the third solenoid valve (K3) are opened to supply water according to a preset flow ratio, and the flow rate is maintained for 60 seconds; When the temperature T3 measured by the third temperature sensor (P3) is monitored to be ≥27°C, the water pump is started, the third solenoid valve (K3) is closed, and the second solenoid valve (K2) is opened to the maximum and maintained for 60 seconds; S2, monitoring the temperature T3 measured by the third temperature sensor (P3) every 60 seconds; If T3≤23℃, the flow rate of the third solenoid valve (K3) is increased and the flow rate of the second solenoid valve (K2) is reduced; if 27℃≤T3≤30℃, the flow rate of the third solenoid valve (K3) is increased and the flow rate of the second solenoid valve (K2) is reduced. After each flow adjustment, the flow rate is maintained for 60 seconds until 23℃≤T3≤27℃, and the current flow rate ratio is maintained unchanged. After maintaining for 60 seconds, the water pump (3) is turned off or maintained at low power operation; If T3 ≥ 30°C, close the third solenoid valve (K3), open the second solenoid valve (K2) to the maximum, keep it for 60 seconds, until 23°C ≤ T3 ≤ 27°C, keep it for 60 seconds, and turn off the water pump (3) or maintain low power operation; The above steps are repeated to maintain the temperature measured by the third temperature sensor (P3) to satisfy 23°C ≤ T3 ≤ 27°C.

2. The solar water heating device with temperature-controllable photovoltaic power generation structure according to claim 1, characterized in that: The preset flow ratio is determined based on the following method: The average outlet water temperature T0 (°C) of the solar water heater and the tap water supply temperature T0′ (°C) at the same historical time node are obtained, and the initial flow rate Q2 of the second solenoid valve (K2) and the initial flow rate Q3 of the third solenoid valve (K3) are controlled to satisfy: Q2*T0′+Q3*T0=(Q2+Q3)(25+k); wherein 0≤k≤5 is the pipeline insulation coefficient. If the total length of the pipeline is shorter and the insulation effect is better, k is smaller, and vice versa.

3. The solar water heating device with temperature-controllable photovoltaic power generation structure according to claim 2, characterized in that: The controller is also configured to: periodically monitor the outlet water temperature of the mixing temperature regulating pipeline (L7) based on the second temperature sensor (P2); during the process of adjusting the opening of each solenoid valve and starting and stopping the water pump (3), if the outlet water temperature T2 of the temperature regulating pipeline (L7) is monitored to be ≤25°C, then adjust the flow rate adjustment amount ΔQ of each time of the third solenoid valve (K3) and the flow rate adjustment amount ΔQ′ of each time of the second solenoid valve (K2) according to the value of T2, wherein: ΔQ=k1Q3, ΔQ′=k2Q2, 0.1≤k2≤k1≤0.

5.

4. The solar water heating device with temperature-controllable photovoltaic power generation structure according to claim 1, characterized in that: The circulating temperature control pipe group (L6) refers to an S-shaped multi-loop bent pipe evenly arranged on the back side of the photovoltaic power generation panel (21).

5. The solar water heating device with temperature-controllable photovoltaic power generation structure according to claim 4, characterized in that: The S-shaped multi-circuit elbow pipe is composed of a plurality of horizontal straight pipes and bent pipes connecting the horizontal straight pipes; a sewage pipe head (60) is arranged on the bottom horizontal straight pipe of the S-shaped multi-circuit elbow pipe.

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