Solar collector, hot water system, method of replenishment

Abstract

The application discloses a solar energy collector, a hot water system and a water supplement method. The solar energy collector comprises a heat absorption plate for absorbing solar energy, and heat collection channels for heat exchange with the heat absorption plate. The heat collection channels are provided with at least two groups, and the water inlet of each group of heat collection channels is connected with an independent water inlet pipe. The solar energy collector can realize different functions through different groups of heat collection channels.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot water systems, in particular to a solar heat collector and a hot water system using the same. BACKGROUND

[0002] Under the background of energy revolution and national double carbon strategy, a new type of hot water system centered on efficient, intelligent, safe and energy-saving water heaters has been fully applied. Based on the comprehensive consideration of economic benefits, environmental benefits and social responsibility, the current market mostly adopts the heating mode of solar heat collection + air source heat pump hot water system. However, the existing system has two problems. First, the single-pipe design of the traditional solar heat collection system cannot simultaneously supplement water in the water tank during circulation heating. Second, the existing system uses a municipal water direct supplement design when supplementing water in the water tank, which causes the temperature in the water tank to drop sharply each time the system is supplemented (the problem is more obvious in winter). The above two key problems will cause the circulation heating time to be longer, resulting in water temperature fluctuations at the use side, affecting the use experience, and the energy consumption of the entire system is high and the energy utilization rate is low. SUMMARY

[0003] In order to solve the technical problem that the single-pipe design of the solar heat collector in the prior art cannot meet other requirements during circulation heating, the present application provides a solar heat collector, a hot water system and a water supplementing method.

[0004] The solar heat collector provided by the present application comprises a heat absorption plate for absorbing solar energy, and a heat collection channel for heat exchange with the heat absorption plate. The heat collection channel is provided with at least two groups, and the water inlet of each group of heat collection channels is connected with an independent water inlet pipe.

[0005] Further, the water outlets of each group of heat collection channels are all connected to the same water outlet pipe.

[0006] Further, the heat collection channel comprises a first group of heat collection channels with the water inlet connected to the water inlet pipe of municipal water, and a second group of heat collection channels with the water inlet connected to the solar water return pipe.

[0007] Further, a water supplementing valve is arranged at the water inlet of the first group of heat collection channels.

[0008] Further, each group of heat collection channels is bent back and forth or spirals around a center between the respective water inlets and water outlets, so as to increase the heat exchange area of the heat collection channel and the heat absorption plate.

[0009] The hot water system provided by the present application comprises at least one heat source, and the heat source comprises the solar heat collector according to the above technical solution.

[0010] Further, a water tank and a water supply terminal connected with the water tank are further included, a solar return water pipe of the solar collector is connected with a water outlet of the water tank, and a water outlet pipe of the solar collector is connected with a water inlet of the water tank.

[0011] Further, a solar circulating water pump and a solar side return water valve are arranged on the solar return water pipe.

[0012] Further, a terminal water supply pump is arranged between the water tank and the water supply terminal.

[0013] Further, the heat source further includes an air source heat pump unit, a return water pipe of the air source heat pump unit is connected with the water outlet of the water tank, and a water outlet pipe of the air source heat pump unit is connected with the water inlet of the water tank.

[0014] Further, an air source circulating water pump is arranged on the return water pipe.

[0015] Further, a water supply pipe of the air source heat pump unit is connected with a water inlet pipe of municipal water.

[0016] The water supply method of the hot water system according to the technical scheme provided in the present application includes:

[0017] Monitoring a liquid level and a water temperature of a water tank of the hot water system;

[0018] When the water supply valve of the solar collector is in a closed state, the liquid level is detected for multiple times within a first preset time length and is less than a preset stop water supply liquid level, and the water temperature is greater than a preset water supply temperature, the water supply valve of the solar collector is opened; and / or,

[0019] When the water supply valve is in an opened state, the liquid level is detected for multiple times within a second preset time length and is greater than or equal to the preset stop water supply liquid level, or the water temperature is less than a preset stop water supply temperature, the water supply valve is closed.

[0020] Further, when the water supply valve is in the closed state, the liquid level is detected and is less than the preset stop water supply liquid level, and the water temperature is greater than the preset water supply temperature, a countdown is started according to the first preset time length, and after the countdown ends, the liquid level is detected again and is less than the preset stop water supply liquid level, and the water temperature is greater than the preset water supply temperature, the water supply valve of the solar collector is opened.

[0021] Further, when the water supply valve is in the opened state, if the liquid level is detected and is greater than or equal to the preset stop water supply liquid level, or the water temperature is less than the preset stop water supply temperature, a countdown is started according to the second preset time length, and after the countdown ends, if the liquid level is detected again and is greater than or equal to the preset stop water supply liquid level, or the water temperature is detected and is less than the preset stop water supply temperature, the water supply valve of the solar collector is closed.

[0022] The internal heat collecting flow channel of the solar energy collector is improved, and multiple sets of heat collecting flow channels are adopted, and different heat collecting flow channels correspond to different water inlets, so that the solar energy collector can meet different requirements. In a specific example, the solar energy collector adopts a double-pipe design, and the water supplement pipe and the circulating pipe are designed separately, so that the solar system circulating heating and water supplement are independent of each other and do not affect each other, solving the problem that the hot water system cannot be circulated and heated when supplementing water, and improving the operation efficiency of the whole system. The application uses solar energy to solve the problem that the water supplement temperature is low in winter and summer, which leads to a long water tank circulating heating time, and extremely uses solar resources to improve the water tank water supplement temperature and reduce the influence of water tank water supplement on user hot water use. BRIEF DESCRIPTION OF DRAWINGS

[0023] The application will be described in detail below with reference to the embodiments and drawings, in which:

[0024] Figure 1 is a schematic diagram of the internal heat collecting flow channel of the solar energy collector according to an embodiment of the application.

[0025] Figure 2 is a structure block diagram of the hot water system according to an embodiment of the application.

[0026] Figure 3 is a water supplement flow chart according to an embodiment of the application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 1, solar energy collector; 11, first set of heat collecting flow channels; 12, second set of heat collecting flow channels; 13, water outlet pipe; 2, air source heat pump unit; 3, water tank; 4, municipal water inlet pipe; 5, water supplement valve; 6, water supply end; 7, end water supply pump; 8, solar energy circulating water pump; 9, solar energy side backwater valve; 10, air source circulating water pump. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects of the application clearer and more apparent, the application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0030] Thus, one feature described in the specification can be used to describe one embodiment of the application while another feature can be used to describe another embodiment of the application. Moreover, the features can be combined in other combinations than those explicitly described herein. Thus, the scope of the application is not limited to the specific combinations of features described herein. Rather, features described herein can be combined with other features in one or more embodiments.

[0031] The solar energy collector of the present application comprises a heat absorbing plate for absorbing solar energy, and a heat collecting channel for exchanging heat with the heat absorbing plate.

[0032] In one embodiment, the solar energy collector can comprise an upper glass cover and a lower glass cover arranged oppositely, and a side frame arranged between the upper glass cover and the lower glass cover. The upper glass cover and the lower glass cover are fixed to the upper edge surface and the lower edge surface of the side frame respectively by sealing glue. Thus, a sealed heat collecting space is defined between the side frame and the upper glass cover and the lower glass cover. In order to reduce the heat loss of the heat collecting space, the heat collecting space is preferably a vacuum heat collecting space.

[0033] The heat absorbing plate and the heat collecting channel are arranged in the vacuum heat collecting space. Since the vacuum heat collecting space has good heat insulation performance, the vacuum heat collecting space can not be provided with a heat preservation layer. In this way, it is possible for the back surface of the heat absorbing plate to receive the diffused and reflected sunlight.

[0034] The heat collecting channel of the present application is provided with at least two groups. The water inlet of each group of heat collecting channels is connected to an independent water inlet pipe. Each group of heat collecting channels can contain only one heat collecting pipe, or can contain multiple heat collecting pipes. By providing at least two groups of heat collecting channels, the present application can meet other needs at the same time when circulating heating.

[0035] In one embodiment, the water outlets of each group of heat collecting channels can also be collected into the same water outlet pipe, so as to provide hot water for the same object. In other embodiments, the water outlets of each group of heat collecting channels can also be provided to different water outlet pipes, so as to provide hot water for different objects.

[0036] Figure 1 A specific embodiment of the heat collecting channel inside the solar energy collector 1 of the present application is shown. In this embodiment, two groups of heat collecting channels are provided, which are a first group of heat collecting channels 11 and a second group of heat collecting channels 12.

[0037] The first group of heat collecting channels 11 is provided with one heat collecting pipe, and the second group of heat collecting channels 12 is provided with one heat collecting pipe.

[0038] The water inlet of the first group of heat collecting flow channels 11 is connected with the water inlet pipe of the municipal water, and the water inlet of the second group of heat collecting flow channels 12 is connected with the solar water return pipe. The first group of heat collecting flow channels 11 can be used for other needs, such as water replenishment for a water tank, and the second group of heat collecting flow channels 12 can realize circulating heating.

[0039] The water outlets of the two groups of heat collecting flow channels are finally collected into the same water outlet pipe 13.

[0040] Figure 1 Fig. 3 is a schematic view of the internal pipeline of the solar collector, Figure 1 The heat collecting flow channel on the left side is the first group of heat collecting flow channels 11 connected with the municipal water, and the heat collecting flow channel on the right side is the second group of heat collecting flow channels 12 which can realize circulating heating. The low-temperature municipal water can be transported to the water tank after being heated by the solar collector 1, and the water in the water tank is connected with the second group of heat collecting flow channels 12 through the circulating water pipe to realize uninterrupted circulating heating, so that the water quantity and temperature in the water tank are fully guaranteed. The design does not affect the operation of the circulating heating, and the functions of water replenishment and circulating heating can be realized at the same time.

[0041] In one embodiment, a water replenishment valve 5 is arranged at the water inlet of the first group of heat collecting flow channels 11.

[0042] In one embodiment, each group of heat collecting flow channels is bent back and forth or spirals around a center between the water inlet and the water outlet thereof to increase the heat exchange area of the heat collecting flow channel and the heat absorbing plate. For example, it can be designed as Figure 1 The zigzag bending back and forth increases the heat exchange area and improves the heat exchange efficiency of the solar collector 1.

[0043] The hot water system of the present application comprises at least one heat source, and the heat source of the hot water system comprises the above-mentioned technical solution of the solar collector 1, that is, the solar collector 1 serves as one of the heat sources of the hot water system.

[0044] In one embodiment, the hot water system comprises a water tank 3 and a water supply end 6 connected with the water tank 3, and water is supplied to the water supply end 6 through the water tank 3, for example, water is supplied to the bathing spray head of a user through the water tank 3.

[0045] The solar water return pipe of the solar collector 1 is connected with the water outlet of the water tank 3, and the water outlet pipe 13 of the solar collector 1 is connected with the water inlet of the water tank 3, so that the first group of heat collecting flow channels 11 of the solar collector 1 forms a hot water replenishment pipeline of the water tank 3, and the second group of heat collecting flow channels 12 of the solar collector 1 forms a circulating heating pipeline with the water tank 3, realizing that the solar energy can additionally add new hot water into the water tank 3 while circulating heating.

[0046] In other embodiments, the heat collecting channels of the solar collector 1 are not limited to the two types exemplified above, and other heat collecting channels can be added for other purposes, such as heating the water in the end pipeline, so that when the user opens the shower nozzle of the water supply end 6, hot water is obtained, avoiding the waste of water resources caused by draining cold water before bathing.

[0047] In one embodiment, a solar circulating water pump 8 and a solar side return valve 9 are provided on the solar return pipeline. The solar circulating water pump 8 can also be provided at other positions on the circulating heating pipeline, and is not limited to the solar return pipeline.

[0048] In one embodiment, an end water supply pump 7 is provided between the water tank 3 and the water supply end 6. The water supply end 6 is supplied with water by the water supply pump. In other embodiments, the water tank 3 and the water supply end 6 can also be supplied with water by height difference, i.e. the height of the water tank 3 is much higher than that of the water supply end 6, and the water is supplied under the action of gravity.

[0049] Figure 2 Another embodiment of the present application is shown, in which the heat source of the hot water system is provided with two, one is the air source heat pump unit 2 as the main heat source, and the other is the solar collector 1 as the auxiliary heat source. The air source heat pump unit 2 uses green and pollution-free cold coal to extract heat from the air, and through the work of the compressor, it produces hot water that meets the user's needs. Using the air source heat pump unit 2 to provide hot water can meet people's different hot water needs such as large water volume, high water pressure, and constant temperature.

[0050] The return pipeline of the air source heat pump unit 2 is connected to the water outlet of the water tank 3, and the water outlet pipe 13 of the air source heat pump unit 2 is connected to the water inlet of the water tank 3.

[0051] Through the above two heat sources, the hot water system of the present application actually forms a solar heat collection + air source heat pump hot water system, i.e. the air source heat pump unit 2 as the main heat source, and the solar collector 1 as the auxiliary heat source. Compared with the traditional hot water system, the hot water system of the present application increases the municipal water inlet pipe 4 and the corresponding water replenishing valve 5, and deletes the original connecting pipeline between the water tank 3 and the municipal water and the corresponding on-off valve. When the hot water system needs to be replenished with water, the low-temperature municipal water is heated by the solar collector 1 before entering the water tank 3, thereby increasing the temperature of the mixed water in the water tank 3.

[0052] In one embodiment, an air source circulating water pump 10 is installed on the return pipeline of the air source heat pump unit 2. In other embodiments, the air source circulating water pump 10 can also be installed on the water outlet pipe 13 of the air source heat pump unit 2.

[0053] The air source heat pump unit 2 is also equipped with a water supply pipe, which is connected to the municipal water inlet pipe 4, allowing for direct water replenishment via municipal water, which is quick and convenient.

[0054] Apart from Figure 2 In addition to the specific embodiments, the present invention may also use other heat sources, and the number is not limited to two. Those skilled in the art can make adjustments as needed.

[0055] This invention adds a municipal water inlet pipe and a water replenishment valve located near the inlet of the municipal water inlet pipe close to the first set of solar collector channels to the traditional hot water system, while optimizing and eliminating the water tank replenishment valve and corresponding piping in the prior art. When the hot water system needs to replenish the water tank, municipal water enters the solar collector through the municipal water inlet pipe, raising the temperature of the low-temperature municipal water before replenishing the water tank. Compared with the traditional hot water system that directly inputs municipal water into the water tank through the water tank replenishment valve, this increases the water temperature in the tank after replenishment, reduces the heating time of the air source heat pump unit after replenishment, makes full use of solar energy, and reduces the total energy consumption of the hot water system.

[0056] This invention optimizes the internal piping (collector flow channel) of a solar collector, achieving a dual-pipe design that includes both municipal water piping and circulating heating pipes. This design allows for simultaneous solar heating circulation and water tank replenishment, solving the problem of single-pipe solar collectors being unable to heat the low-temperature municipal water before replenishing the tank during water tank circulation heating. This improves the operating efficiency of the hot water system and simplifies its control. Compared to traditional hot water system control methods, the optimized system eliminates the need for switching between a water replenishment valve and a water tank replenishment valve, as well as winter / summer mode switching.

[0057] The water replenishment method for the hot water system of the present invention includes the following steps.

[0058] Monitor the liquid level and water temperature in the hot water system's tank;

[0059] When the water supply valve of the solar collector is closed, if the water level in the tank is repeatedly detected to be lower than the preset stop water supply level within a first preset time period, and the water temperature in the tank is higher than the preset water supply temperature, then the water supply valve of the solar collector is opened; and / or, when the water supply valve of the solar collector is open, if the water level in the tank is repeatedly detected to be higher than or equal to the preset stop water supply level within a second preset time period, or the water temperature in the tank is lower than the preset stop water supply temperature, then the water supply valve of the solar collector is closed.

[0060] Figure 3 A specific embodiment of the water replenishment method for the hot water system of the present invention is shown.

[0061] In this embodiment, when the water replenishing valve of the solar collector is in the closed state, if it is detected that the liquid level of the water tank is less than the preset stop water replenishing liquid level and the water temperature of the water tank is greater than the preset water replenishing temperature, a countdown is started for a first preset time length, and after the countdown ends, if it is again detected that the liquid level of the water tank is less than the preset stop water replenishing liquid level and the water temperature of the water tank is greater than the preset water replenishing temperature, the water replenishing valve of the solar collector is opened.

[0062] Similarly, when the water replenishing valve of the solar collector is in the open state, if it is detected that the liquid level of the water tank is greater than or equal to the preset stop water replenishing liquid level or the water temperature of the water tank is less than the preset stop water replenishing temperature, a countdown is started for a second preset time length, and after the countdown ends, if it is again detected that the liquid level of the water tank is greater than or equal to the preset stop water replenishing liquid level or the water temperature of the water tank is less than the preset stop water replenishing temperature, the water replenishing valve of the solar collector is closed.

[0063] That is, in this embodiment, a total of only two detections are performed within the first preset time length and the second preset time length, and the two detections are respectively a detection that meets the condition for starting the countdown and a detection that meets the condition at the end of the countdown. If the second detection does not meet the condition after the countdown ends, the corresponding water replenishing valve action is not triggered, because during the water replenishing process of the water tank, the liquid level and the temperature in the water tank will fluctuate to a certain extent, and therefore only one detection that meets the condition will not trigger the corresponding water replenishing valve action, thereby avoiding that the water replenishing valve is frequently controlled.

[0064] In this embodiment, mode selection can also be performed, for example, into a manual water replenishing mode and an automatic water replenishing mode, and when the user selects the automatic water replenishing mode, the steps of the above water replenishing method are adopted.

[0065] The specific embodiments of the application will be described in detail below with reference to a specific example. Figure 3

[0066] The user selects a manual water replenishing mode or an automatic water replenishing mode.

[0067] When the user selects the automatic water replenishing mode, the liquid level and the water temperature of the water tank of the hot water system are monitored.

[0068] When the water replenishing valve of the solar collector is in the closed state, it is determined whether the liquid level of the water tank is less than the preset stop water replenishing liquid level (for example, the preset stop water replenishing liquid level is by default 90% of the height of the water tank) and whether the water temperature of the water tank is greater than the preset water replenishing temperature (for example, the preset water replenishing temperature is by default 47°C).

[0069] If the above conditions are not met, the water replenishing valve remains in the current state, i.e., the closed state.

[0070] ​If the above conditions are met, a countdown is performed, for example, a 20-second delay, and after 20 seconds, it is determined again whether the water tank liquid level is less than the preset stop water filling liquid level, and whether the water tank water temperature is greater than the preset water filling temperature.

[0071] If the above conditions are not met, the water filling valve remains in the current state, i.e., the closed state.

[0072] If the above conditions are met, the water filling valve is opened, and the municipal water heated by the solar energy is started to be filled into the water tank.

[0073] When the water filling valve of the solar energy collector is in the open state, it is determined whether the water tank liquid level is greater than or equal to the preset stop water filling liquid level, or whether the water tank water temperature is less than the preset stop water filling temperature (for example, the preset stop water filling water temperature is 43°C by default).

[0074] If the above conditions are not met, the water filling valve remains in the current state, i.e., the open state.

[0075] If the above conditions are met, a countdown is performed, for example, a 20-second delay, and after 20 seconds, it is determined again whether the water tank liquid level is greater than or equal to the preset stop water filling liquid level, or whether the water tank water temperature is less than the preset stop water filling temperature.

[0076] If the above conditions are not met, the water filling valve remains in the current state, i.e., the open state.

[0077] If the above conditions are met, the water filling valve is closed, and the water filling is ended.

[0078] The present application provides a novel solar water heating system and a water filling method, which improves the system operation efficiency, improves the energy utilization rate, and reduces the energy consumption of the entire system under the premise of ensuring stable operation of the system.

[0079] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A solar collector comprising a heat absorbing panel for absorbing solar energy, and a heat collecting channel which exchanges heat with said heat absorbing panel, characterized in that, The heat collecting channels are provided with at least two groups, and the water inlets of each group of heat collecting channels are connected with an independent water inlet pipe; The water outlets of each group of heat collecting channels are connected with a same water outlet pipe; The heat collecting channels comprise a first group of heat collecting channels with water inlets connected with a municipal water inlet pipe and a second group of heat collecting channels with water inlets connected with a solar water return pipe.

2. The solar collector of claim 1, wherein, The water inlets of the first group of heat collecting channels are provided with a water supplement valve.

3. The solar collector of claim 1, wherein, Each group of heat collecting channels is bent back and forth or spirals around a center between the respective water inlets and water outlets to increase the heat exchange area of the heat collecting channels and the heat absorbing plates.

4. A hot water system comprising at least one heat source, characterised in that, The heat source comprises the solar heat collector according to any one of claims 1 to 3.

5. The hot water system of claim 4, wherein, Further comprising a water tank and a water supply terminal connected with the water tank, the solar water return pipe of the solar heat collector is connected with a water outlet of the water tank, and the water outlet pipe of the solar heat collector is connected with a water inlet of the water tank.

6. The hot water system of claim 5, wherein, The solar water return pipe is provided with a solar circulating water pump and a solar side water return valve.

7. The hot water system of claim 5, wherein, A terminal water supply pump is arranged between the water tank and the water supply terminal.

8. The hot water system of claim 5, wherein, The heat source further comprises an air source heat pump unit, a water return pipe of the air source heat pump unit is connected with a water outlet of the water tank, and a water outlet pipe of the air source heat pump unit is connected with a water inlet of the water tank.

9. The hot water system of claim 8, wherein, An air source circulating water pump is arranged on the water return pipe.

10. The hot water system of claim 8, wherein, A water supplement pipe of the air source heat pump unit is connected with a water inlet pipe of municipal water.

11. A method of replenishing a water system as claimed in any one of claims 4 to 10, wherein, Comprise: Monitoring the liquid level and water temperature of the water tank of the hot water system; When the water supplement valve of the solar heat collector is in a closed state, the liquid level is detected less than a preset stop water supplement liquid level for multiple times within a first preset time length, and the water temperature is greater than a preset water supplement temperature, the water supplement valve of the solar heat collector is opened; And / or, When the water supplement valve is in an open state, the liquid level is detected greater than or equal to a preset stop water supplement liquid level for multiple times within a second preset time length, or the water temperature is detected less than a preset stop water supplement temperature, the water supplement valve is closed.

12. The water replenishing method of a hot water system according to Claim 11, wherein When the water supplement valve is in a closed state, the liquid level is detected less than a preset stop water supplement liquid level, and the water temperature is greater than a preset water supplement temperature, a countdown is started according to the first preset time length, and after the countdown is ended, if the liquid level is detected less than a preset stop water supplement liquid level again, and the water temperature is greater than a preset water supplement temperature, the water supplement valve of the solar heat collector is opened.

13. The water replenishing method of a hot water system according to Claim 11, wherein When the water supplement valve is in an open state, the liquid level is detected greater than or equal to a preset stop water supplement liquid level, or the water temperature is detected less than a preset stop water supplement temperature, a countdown is started according to the second preset time length, and after the countdown is ended, if the liquid level is detected greater than or equal to a preset stop water supplement liquid level again, or the water temperature is detected less than a preset stop water supplement temperature, the water supplement valve of the solar heat collector is closed.

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