Groove type solar heating system based on water working medium

Abstract

The utility model belongs to the technical field of trough type solar heat supply, and particularly relates to a trough type solar heat supply system based on a water working medium, which comprises a cold water tank, one end of the cold water tank is provided with a water inlet pipe communicated with external cold water supply, and one end of the cold water tank far away from the water inlet pipe is fixedly provided with a circulating water pipe communicated with the inside. A filter, a circulating water pump and an electric control valve are sequentially mounted on the circulating water pipe, and a plurality of groove type heat collectors are mounted on the circulating water pipe; water media circulate into the groove type heat collector or the electric heater through the circulating pump to achieve temperature rise, hot water is extremely prone to be in a boiling state due to the fact that the heating target temperature or the altitude of part of areas is high, and water vaporization in the state can cause unstable pressure in the system. And aggregation of the bubbles in the heat collecting pipe can cause the problems of heat exchange efficiency reduction, non-uniform temperature and the like.

Description

Technical Field

[0001] This utility model belongs to the field of trough solar heating technology, specifically a trough solar heating system based on water as the working medium. Background Technology

[0002] A parabolic trough solar heating system is a technology that utilizes solar energy for thermal energy conversion, primarily used to provide hot water, heating, or industrial heat. It achieves high energy efficiency by focusing sunlight and converting it into heat. The main characteristic of this system is the use of a series of parabolic trough-shaped reflectors to concentrate solar radiation, thereby heating the working fluid, typically a liquid or gas.

[0003] Parabolic trough solar heating systems are primarily used in applications where water is the heat transfer medium and the target heating temperature is close to saturation, serving to stabilize the system pressure. Existing parabolic trough solar heating systems typically install the hot water tank several meters or even tens of meters above the collector field to stabilize the system pressure and absorb the volume expansion of the heated medium. While this method is reliable, the initial investment and subsequent maintenance costs for large, high-level hot water tanks are high. Furthermore, parabolic trough solar heating systems also suffer from discontinuous heating due to weather conditions and day-night cycles.

[0004] Therefore, this utility model provides a trough-type solar heating system based on water as a working medium. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The present utility model discloses a trough-type solar heating system based on water working medium, including a cold water tank. One end of the cold water tank is provided with an inlet pipe connected to an external cold water supply. The end of the cold water tank away from the inlet pipe is fixedly installed with a circulating water pipe connected to the inside. A filter, a circulating water pump and an electric regulating valve are installed sequentially on the circulating water pipe. Several trough-type solar collectors are installed on the circulating water pipe. A miniature high-level expansion tank is also provided on the circulating water pipe. The miniature high-level expansion tank is higher than the solar collector pipe, and the outlet of the solar collector pipe is connected to the bottom of the miniature high-level expansion tank. The end of the circulating water pipe is connected to a hot water tank for storing hot water for heating users.

[0007] Furthermore, the miniature high-level expansion tank has a vent at the top, through which it is connected to the atmosphere.

[0008] Furthermore, an electric heater is installed on the circulating water pipe as a second heat source for use at night or in the absence of light.

[0009] Furthermore, a safety valve is installed on the circulating water pipe.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This utility model describes a water-based trough solar heating system. The water medium is circulated through a pump to the trough collector or electric heater for heating. Due to the target heating temperature or high altitude in some areas, the hot water easily approaches boiling point. Vaporization in this state leads to unstable pressure within the system, and the accumulation of bubbles in the collector tubes causes reduced heat exchange efficiency and uneven temperature. Therefore, a miniature high-level expansion tank is installed at the collector outlet. The static pressure provided by the miniature high-level expansion tank increases the boiling point temperature of the water in the system, stabilizing the pressure. The hot water overflows from the miniature high-level expansion tank and enters a ground-mounted hot water tank. Since the hot water tank is often large, this ground-mounted design not only reduces initial civil engineering costs but also facilitates later operation and maintenance. This application uses two heat sources to provide heating, which are connected in parallel. The first heat source is a parabolic trough collector, which can be used during the day when there is sufficient sunlight. The second heat source is an electric heater, which can be used at night or when there is no sunlight. By taking advantage of the fact that solar energy and surplus or off-peak electricity are basically complementary throughout the day, the application uses inexpensive heat sources at different times to provide continuous heating for users, which greatly reduces heating costs. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the system flow in this utility model;

[0014] In the diagram: 1. Cold water tank; 2. Filter; 3. Circulating water pump; 4. Electric regulating valve; 5. Trough-type solar collector; 6. Safety valve; 7. Miniature high-level expansion tank; 8. Hot water tank; 9. Electric heater; Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] like Figure 1As shown in the embodiment of this utility model, a trough-type solar heating system based on a water-working medium includes a cold water tank 1. One end of the cold water tank 1 is connected to an external cold water supply via an inlet pipe. The end of the cold water tank 1 furthest from the inlet pipe is fixedly connected to an internal circulating water pipe. A filter 2, a circulating water pump 3, and an electric regulating valve 4 are sequentially installed on the circulating water pipe. Several trough-type solar collectors 5 are installed on the circulating water pipe. A miniature high-level expansion tank 7 is also installed on the circulating water pipe, extending above the collector pipe, and its outlet is connected to the bottom of the miniature high-level expansion tank 7. A hot water tank 8 is connected to the end of the circulating water pipe. A vent is provided at the top of the miniature high-level expansion tank 7, allowing it to communicate with the atmosphere. An electric heater 9 is installed on the circulating water pipe. A safety valve 6 is also installed on the circulating water pipe.

[0017] During operation, water is injected into the cold water tank 1 through the inlet pipe. This inlet water can supply cold water or serve as cooling water after heat exchange from hot water heating. The water is then filtered through filter 2, which ensures system water quality and protects the circulating pump. The water medium is then circulated by the circulating pump to the trough collector 5 for heating. Due to the target heating temperature or high altitude in some areas, the hot water easily approaches boiling point. Vaporization in this state can lead to unstable pressure within the system, and the accumulation of air bubbles in the collector tubes can cause reduced heat exchange efficiency and uneven temperature. Therefore, a miniature high-level expansion tank 7 is installed at the outlet of the collector field. The static pressure provided by the miniature high-level expansion tank 7 increases the boiling point temperature of the water in the system, stabilizing the pressure. The hot water overflows from the miniature high-level expansion tank 7 and enters the hot water tank 8 located on the ground. The hot water tank 8 is often large in size; its ground-level design not only reduces initial civil engineering investment costs but also facilitates later operation and maintenance.

[0018] It is important to note that the electric regulating valve 4, together with the circulating water pump 3, can regulate the system flow rate to meet different flow requirements under varying weather conditions or different heat source power. The circulating water pump 3 can also be frequency-controlled. The safety valve 6 is installed to relieve pressure on the system when the pressure in the collector field is too high. The hot water tank 8 is located at the end of the system to buffer the water heated by the collector tubes, ensuring a stable supply of hot water to users even during heat source switching, thus achieving continuous and stable heating.

[0019] Meanwhile, this application uses two heat sources to provide heating, which are connected in parallel. The first heat source is a parabolic trough collector 5, which can be used during the day when there is sufficient sunlight; the second heat source is an electric heater 9, which can be used at night or when there is no sunlight. By taking advantage of the fact that solar energy and surplus or off-peak electricity are basically complementary throughout the day, the application uses inexpensive heat sources at different times to provide continuous heating for users, which greatly reduces heating costs.

[0020] Working Principle: Water is injected into the cold water tank 1 through the inlet pipe and filtered through the filter 2. The filter 2 ensures the water quality of the system and protects the circulation pump. The water medium is then circulated by the circulation pump to the trough collector 5 to achieve heating. Due to the target heating temperature or the high altitude in some areas, the hot water is very likely to approach the boiling point. Vaporization of water in this state will cause unstable pressure in the system, and the accumulation of bubbles in the collector tubes will also lead to a decrease in heat exchange efficiency and uneven temperature. Therefore, a miniature high-level expansion tank 7 is set at the outlet of the collector field. The static pressure provided by the miniature high-level expansion tank 7 increases the boiling point temperature of the water in the system, which plays a role in stabilizing the pressure. The hot water overflows from the miniature high-level expansion tank 7 and enters the hot water tank 8 located on the ground. The system flow rate can be regulated by the electric regulating valve 4 together with the circulating water pump 3 to meet the different flow rate requirements under different weather conditions or different heat source power. The circulating water pump 3 can also be frequency converter. The safety valve 6 is set to release pressure in the system when the pressure in the collector field is too high. The hot water tank 8 is located at the end of the system to buffer the water heated by the solar collectors, ensuring a stable supply of hot water to users even during heat source switching, thus achieving continuous and stable heating. Simultaneously, the two heat sources are connected in parallel: the first heat source is the parabolic trough collector 5, which can be used during the day when there is sufficient sunlight; the second heat source is the electric heater 9, which can be used at night or when there is no sunlight. Utilizing the complementary nature of solar energy and surplus or off-peak electricity throughout the day, this system employs inexpensive heat sources at different times of the day to provide continuous heating to users, significantly reducing heating costs.

[0021] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A trough-type solar heating system based on water as the working medium, characterized in that: The device includes a cold water tank (1) and a heat collection pipe. One end of the cold water tank (1) is provided with an inlet pipe that is connected to an external cold water supply. The end of the cold water tank (1) away from the inlet pipe is fixedly installed with a circulating water pipe that is connected to the inside. A filter (2), a circulating water pump (3) and an electric regulating valve (4) are installed on the circulating water pipe in sequence. Several trough-type heat collectors (5) are installed on the heat collection pipe. A miniature high-level expansion tank (7) is also provided on the circulating water pipe. The miniature high-level expansion tank (7) is higher than the heat collection pipe, and the bottom of the heat collection pipe and the miniature high-level expansion tank (7) are connected. A hot water tank (8) is connected to the end of the circulating water pipe.

2. The trough-type solar heating system based on water as described in claim 1, characterized in that: The miniature high-level expansion tank (7) has a vent at the top, and the miniature high-level expansion tank (7) is connected to the atmosphere through the vent.

3. A trough-type solar heating system based on water as described in claim 1, characterized in that: An electric heater (9) is also installed on the circulating water pipe, and the electric heater (9) is connected in parallel with the trough collector (5).

4. A trough-type solar heating system based on water as described in claim 1, characterized in that: A safety valve (6) is installed on the circulating water pipe.

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