Groove type solar heating system based on water working medium

Abstract

The invention 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, a water inlet pipe communicated with external cold water supply is arranged at one end of the cold water tank, and a circulating water pipe communicated with the inside is fixedly mounted at one end, far away from the water inlet pipe, of the cold water tank. 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; a water medium circulates into the groove type heat collector or the electric heater through the circulating pump to achieve temperature rise, hot water is extremely prone to being close to a boiling state due to the fact that the heating target temperature or the altitude of part of areas is high, water vaporization in the state can cause unstable pressure in the system, and heating is not stable. 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] The invention belongs to the technical field of trough type solar energy heating, in particular to a trough type solar energy heating system based on water working medium. Background Art

[0002] The trough solar heating system is a technology that uses solar energy to convert heat energy, mainly used to provide hot water, heating or industrial heat. It achieves efficient energy utilization by focusing sunlight and converting it into heat energy. The main feature of this system is the use of a series of parabolic trough reflectors to concentrate solar radiation to heat the working fluid, usually liquid or gas.

[0003] The main application scenario of the trough solar heating system is to stabilize the voltage of the system in the field of trough solar heating where water medium is used as the heat medium and the heating target temperature is close to the saturation state. The existing trough solar heating system uses the hot water tank installed at a position several meters or even more than ten meters higher than the collector field to stabilize the voltage of the system and absorb the volume expansion of the medium after heating. Although this method has reliable performance, the initial investment cost and subsequent maintenance cost of the high-position layout of the large hot water tank are high. At the same time, the trough solar heating system also has the problem of discontinuous heating due to weather reasons and the alternation of day and night.

[0004] To this end, the present invention provides a trough type solar heating system based on water working medium. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the present invention describes a trough-type solar heating system based on water working medium, comprising a cold water tank, one end of the cold water tank is provided with a water inlet pipe connected to an external cold water supply, the end of the cold water tank away from the water inlet pipe is fixedly provided with a circulating water pipe connected to the interior, a filter, a circulating water pump and an electric regulating valve are sequentially installed on the circulating water pipe, a number of trough-type collectors are installed on the circulating water pipe, a miniature high-position expansion water tank is also provided on the circulating water pipe, the miniature high-position expansion water tank is higher than the heat collecting pipe, and the heat collecting pipe outlet is connected to the bottom of the miniature high-position expansion water tank, and the end of the circulating water pipe is connected to a hot water tank for storing hot water for heating users.

[0007] Furthermore, a vent is provided at the top of the micro high-position expansion water tank, and the micro high-position expansion water tank is connected to the atmosphere through the vent.

[0008] Furthermore, an electric heater is installed on the circulating water pipe as a second heat source for use at night or when there is no light.

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

[0010] The beneficial effects of the present invention are as follows:

[0011] 1. The present invention describes a trough-type solar heating system based on water as a working medium. The water medium is then circulated to the trough-type collector or electric heater through a circulation pump to achieve temperature increase. Due to the heating target temperature or the high altitude of some areas, the hot water is very easy to approach a boiling state. The water vaporization in this state will cause unstable pressure in the system, and the accumulation of bubbles in the collector tube will also cause problems such as reduced heat exchange efficiency and uneven temperature. Therefore, a micro high-level expansion water tank is set at the outlet of the collector field. The static pressure provided by the micro high-level expansion water tank is used to increase the boiling point temperature of the water in the system, which plays a role in stabilizing the pressure. After the hot water overflows through the micro high-level expansion water tank, it enters the hot water tank located on the ground. The hot water tank is often large in size. The design located on the ground not only reduces the initial civil engineering foundation investment cost, but also makes the later operation and maintenance more convenient. The present application adopts two heat sources to realize heating, and the two heat sources are in parallel relationship. The first heat source is a trough collector, which can be used when there is sufficient sunlight during the day; the second heat source is an electric heater, which can be used at night or when there is no light. By utilizing the fact that solar energy and abandoned electricity or valley electricity are basically complementary within a day, cheap heat sources at different time periods are used to realize continuous heating for users, which greatly reduces the heating cost. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0013] Figure 1 It is a schematic diagram of the system flow in the present invention;

[0014] In the figure: 1. cold water tank; 2. filter; 3. circulating water pump; 4. electric regulating valve; 5. trough collector; 6. safety valve; 7. micro high-level expansion water tank; 8. hot water tank; 9. electric heater; DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0016] like Figure 1As shown, a trough type solar heating system based on water working medium described in an embodiment of the present invention comprises a cold water tank 1, one end of the cold water tank 1 is provided with a water inlet pipe connected to an external cold water supply, and one end of the cold water tank 1 away from the water inlet pipe is fixedly installed with a circulating water pipe connected to the inside, and a filter 2, a circulating water pump 3 and an electric regulating valve 4 are installed on the circulating water pipe in sequence, and a plurality of trough type collectors 5 are installed on the circulating water pipe. A micro high-position expansion water tank 7 is also provided on the circulating water pipe, and the micro high-position expansion water tank 7 is higher than the heat collecting pipe, and the outlet of the heat collecting pipe is connected to the bottom of the micro high-position expansion water tank 7, and the end of the circulating water pipe is connected to a hot water tank 8. A vent is provided on the top of the micro high-position expansion water tank 7, and the micro high-position expansion water tank 7 is connected to the atmosphere through the vent. An electric heater 9 is installed on the circulating water pipe. A safety valve 6 is provided on the circulating water pipe.

[0017] During operation, water is injected into the cold water tank 1 through the water inlet pipe. The water inlet can be cold water supply or cooling water after hot water heating and heat exchange, and is filtered through the filter 2. The filter 2 plays a role in ensuring the water quality of the system and protecting the circulation pump. The water medium is then circulated to the trough collector 5 through the circulation pump to achieve temperature rise. Due to the heating target temperature or the high altitude of some areas, the hot water is very easy to approach the boiling state. The water vaporization in this state will cause the pressure in the system to be unstable, and the bubbles will gather in the heat collection pipe, which will also cause the heat exchange efficiency to decrease and the temperature to be uneven. Therefore, a micro high-level expansion water tank 7 is set at the outlet of the heat collection field. The static pressure provided by the micro high-level expansion water tank 7 is used to increase the boiling point temperature of the water in the system, which plays a role in stabilizing the pressure. After the hot water overflows through the micro high-level expansion water tank 7, it enters the hot water tank 8 located on the ground. The hot water tank 8 is often large in size. The design located on the ground not only reduces the initial civil engineering foundation investment cost, but also makes the later operation and maintenance more convenient.

[0018] It should be noted that the electric regulating valve 4 can be used together with the circulating water pump 3 to achieve system flow regulation to meet different flow requirements under different weather conditions or different heat source powers. The circulating water pump 3 can also use variable frequency. The safety valve 6 is set to relieve the system pressure when the pressure of the collector field is too high. The hot water tank 8 is set at the end of the system to cache the water heated by the collector tube. It can also ensure a stable supply of hot water to users during the heat source switching stage, realizing continuous and stable heating.

[0019] At the same time, the present application adopts two heat sources to realize heating, and the two heat sources are in parallel relationship. The first heat source is a trough collector 5, which can be used when there is sufficient light during the day; the second heat source is an electric heater 9, which can be used at night or when there is no light. By utilizing the characteristics that solar energy and abandoned electricity or valley electricity are basically complementary within a day, cheap heat sources at different time periods are used to realize continuous heating for users, which greatly reduces the heating cost.

[0020] Working principle: water is injected into the cold water tank 1 through the water 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 to the trough collector 5 through the circulation pump to achieve temperature rise. Due to the heating target temperature or the high altitude of some areas, the hot water is very easy to approach the boiling state. The water vaporization in this state will cause unstable pressure in the system, and the accumulation of bubbles in the heat collecting pipe will also cause the heat exchange efficiency to decrease and the temperature to be uneven. Therefore, a micro high-level expansion water tank 7 is set at the outlet of the collector field. The static pressure provided by the micro high-level expansion water tank 7 is used to increase the boiling point temperature of the water in the system, which plays a role in stabilizing the pressure. The hot water overflows through the micro high-level expansion water tank 7 and enters the hot water tank 8 located on the ground. The electric regulating valve 4 can be used together with the circulating water pump 3 to achieve system flow regulation to meet different flow requirements under different weather conditions or different heat source powers. The circulating water pump 3 can also use frequency conversion. The safety valve 6 is set to relieve the pressure of the system when the pressure of the collector field is too high. The hot water tank 8 is set at the end of the system to cache the water heated by the heat collecting tube. It can also ensure a stable supply of hot water to users during the heat source switching stage, realizing continuous and stable heating. At the same time, the two heat sources are in parallel. The first heat source is the trough collector 5, which can be used when there is sufficient light during the day; the second heat source is the electric heater 9, which can be used at night or when there is no light. The characteristics of solar energy and abandoned electricity or valley electricity are basically complementary in one day, and cheap heat sources at different time periods are used to realize continuous heating for users, greatly reducing the heating cost.

[0021] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, 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 the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0023] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A trough type solar heating system based on water working medium, characterized in that: The invention comprises a cold water tank (1), one end of which is provided with a water inlet pipe connected to an external cold water supply, one end of the cold water tank (1) away from the water inlet pipe is fixedly provided with a circulating water pipe connected to the inside, a filter (2), a circulating water pump (3) and an electric regulating valve (4) are sequentially installed on the circulating water pipe, a plurality of trough-type heat collectors (5) are installed on the heat collecting pipe, a miniature high-position expansion water tank (7) is also arranged on the circulating water pipe, the miniature high-position expansion water tank (7) is higher than the heat collecting pipe, and the heat collecting pipe and the bottom of the miniature high-position expansion water tank (7) are connected, and the end of the circulating water pipe is connected to a hot water tank (8).

2. A trough type solar heating system based on water working medium according to claim 1, characterized in that: A vent is provided on the top of the micro high-position expansion water tank (7), and the micro high-position expansion water tank (7) is connected to the atmosphere through the vent.

3. A trough type solar heating system based on water as claimed 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 claimed in claim 1, characterized in that: The circulating water pipe is provided with a safety valve (6).

Images