Hemispherical solar still with underground soil condensation integrated brackish water desalination system

Abstract

This invention discloses a saline water desalination system combining a hemispherical solar distiller with underground soil condensation. The system comprises a saline water storage device 1, an evaporation device 2, a condensation device 3, and a freshwater collection device 4. The saline water storage device 1 provides the saline water source for the entire system. The evaporation device 2 utilizes saline water pumped by a water pump 11 for natural evaporation. A centrifugal fan 32 promptly transports the generated water vapor to the underground condensation device 3 via an insulated pipe 31, where it exchanges heat with the soil underground. Finally, the generated freshwater is collected in the freshwater collection device 4. This system eliminates the traditional method of collecting desalinated water where the evaporation and condensation processes occur in the same space. It proposes a method that physically isolates the evaporation and condensation processes of saline water under the influence of solar energy, solving the problem of a significant decrease in condensation efficiency as evaporation and condensation continue in the same space.

Description

Technical Field

[0001] This invention belongs to the field of saline water desalination technology, and specifically relates to a saline water desalination technology that combines a solar-powered distiller with underground soil condensation. Background Technology

[0002] Traditional solar stills combine evaporation and condensation in the same space. However, as the pressure of saturated steam in this confined space increases, the saturated air that doesn't condense in time inhibits the conversion of liquid water into steam, thus reducing condensation efficiency and water production. Furthermore, in traditional solar stills, the temperature of the transparent condenser plate gradually rises during the alternating evaporation and condensation processes, reducing the temperature difference between the saturated steam and the condenser plate, further decreasing condensation efficiency. This invention physically separates the traditional evaporation and condensation processes, improving condensation efficiency. Moreover, soil, as a natural heat exchanger, is a more economical choice for condensation. This will be a crucial technological solution for reusing saline water in remote, water-scarce areas.

[0003] For example, application number CN202421495730.9 discloses a dual-function water storage and drip irrigation device for field use, which includes an evaporation tank (1) with a saline water inlet (7) on the side wall of the evaporation tank (1); a tank cover (2) sealed on the top of the evaporation tank (1); a first condenser pipe (3) on the tank cover (2); a water collection trough (4) inclinedly disposed inside the evaporation tank (1), with a saline water evaporation channel between the water collection trough (4) and the evaporation tank (1), the water collection trough (4) located below the tank cover (2) for collecting water droplets dripping from the tank cover (2); a water collection tank (5) disposed outside the evaporation tank (1), with the lower end of the water collection trough (4) connected to the water collection tank (5); and the inlet end of the drip irrigation main pipe (6) connected to the water collection tank (5). This technology enables the desalination and utilization of saline water in fields and addresses the issue of uneven seasonal rainfall, achieving the goal of "summer water used in spring." It improves the water utilization rate of saline water resources in the Bohai Rim saline-alkali area and increases grain production. However, compared to the output of solar distillers operating under more natural conditions, this design clearly does not offer a significant advantage because its inherent structural design limits its ability to absorb more sunlight and convert it into the heat required for water evaporation. Summary of the Invention

[0004] To overcome the shortcomings of traditional saline water desalination facilities, this invention proposes a saline water desalination system combining a hemispherical solar distiller with underground soil condensation. The system includes a saline water supply section, an evaporation section, a condensation section, and a freshwater collection section. This system abandons the traditional method of collecting desalinated water where the evaporation and condensation processes occur in the same space. It proposes physically isolating the evaporation and condensation processes of saline water under the influence of solar energy, solving the problem of a significant decrease in condensation efficiency as evaporation and condensation continue in the same space. Experiments have proven that the hemispherical distiller is the optimal component for steam generation, and the condensation section utilizes the excellent thermal conductivity of the soil, thus becoming a natural condenser. Under the abundant solar radiation conditions in southern Xinjiang, steam is generated using a traditional solar distiller. A centrifugal fan continuously transports the generated steam to a pipeline buried one meter underground. Utilizing the excellent ground-air heat exchange properties, the system reuses saline wastewater from farmland. The resulting freshwater is collected and ultimately used for irrigation and to provide drinking water for remote, water-scarce areas in southern Xinjiang. This saline desalination system fully leverages the significant advantages of both evaporation and condensation components, ultimately achieving a considerable freshwater production.

[0005] The present invention provides a saline desalination system combining a hemispherical solar distiller with underground soil condensation, which consists of a saline storage device (1), an evaporation device (2), a condensation device (3), and a freshwater collection device (4).

[0006] The saline water storage device (1) consists of a water storage arch (7), an inlet pipe (5), a water pump (11), and a water supply pipe (21).

[0007] The water storage arch shed (7) consists of an arch shed support (12), a transparent film (13) and a saltwater pool (14). The lower part of the water storage arch shed (7) is a cubic saltwater pool (14), and the top is an arch shed support (12), which is fixed to the top of the four walls of the saltwater pool (14). The top and sides of the arch shed support (12) are covered with a transparent film (13).

[0008] An inlet pipe (5) is installed on one of the vertical walls of the saltwater pool (14). A water pump (11) and a water supply pipe (21) are connected at the bottom of the water storage arch (7). The water supply pipe (21) passes through the top of the water storage arch (7) and connects to the evaporation device (2).

[0009] Furthermore, an inlet valve (6) is installed on the inlet pipe (5).

[0010] The evaporation device (2) consists of several hemispherical evaporators (8) and a salt water recovery tank (16). The hemispherical evaporator (8) consists of a circular evaporation tank (22) and a hemispherical transparent cover (23).

[0011] The circular evaporation pool (22) is provided with inner and outer double-layer pool walls. An annular space is formed between the outer wall (29) and the inner wall (30) of the evaporation pool. A condensate outlet hole (24.1) is provided at the bottom of the evaporation pool, which is connected to the underground condensate storage tank (36) through a condensate collection pipe (28). A salt water discharge hole (24.2) is provided at the bottom between the inner walls (30) of the circular evaporation pool (22), which is connected to the salt water recovery pool (16) through a salt water discharge pipe (27).

[0012] The circular evaporation pool (22) is provided with a hemispherical transparent cover (23) which is connected and fixed to the outer wall (29) of the evaporation pool. The branch pipe of the water supply pipe (21) enters the hemispherical evaporator (8) from the top of each hemispherical transparent cover (23).

[0013] Furthermore, a water inlet switch (25) is installed on the water supply pipe (21).

[0014] The horizontally arranged hemispherical evaporators (8) are connected by a connecting pipe (15), and the vertically arranged hemispherical evaporators (8) near the salt water storage device (1) are also connected by a connecting pipe (15). A valve (26) is installed on all the connecting pipes (15). An air inlet fan (20) is connected to the hemispherical evaporator (8) at the very end, and an insulated pipe (31) is connected to the hemispherical evaporator (8) near the condensing device (3) to lead to the condensing device (3).

[0015] The condensation device (3) consists of an insulated pipe (31), a centrifugal fan (32), a wet steam valve (33), a vortex flow meter (34), and an underground condenser pipe (35).

[0016] The insulated pipe (31) that flows out from the evaporator (2) is set above the ground and connected to the underground condenser pipe (35) set at a certain depth below the ground. A wet steam valve (33), a centrifugal fan (32) and a vortex flow meter (34) are installed on the insulated pipe (31) in sequence.

[0017] Furthermore, the underground condenser pipe (35) consists of several condenser pipes.

[0018] The freshwater collection device (4) is a semi-closed underground condensate storage tank (36) set at a certain depth below the ground. The underground condensate pipe (35) enters the tank from the side wall of the underground condensate storage tank (36) near the condensate device (3). A water pump (38) is installed at the bottom of the tank and connected to the outlet pipe (37) to the ground.

[0019] Furthermore, a water pump switch (39) is provided on the water outlet pipe (37).

[0020] Compared with traditional saltwater desalination technology, this invention has the following advantages: By physically isolating the evaporation and condensation processes of saline water and making full use of the excellent ground-atmosphere heat exchange method, the condensation efficiency of the system is significantly improved.

[0021] Utilizing the soil's excellent thermal conductivity, it becomes a natural and durable refrigerant, saving electricity and labor, making it an energy-saving saline desalination technology.

[0022] It enables the reuse of saline wastewater for agricultural and forestry irrigation and drinking water in remote and water-scarce areas, while also benefiting environmental protection. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0024] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the pipeline of the connecting pipe (15), water supply pipe (21), salt water discharge pipe (27) and condensate collection pipe (28) of the present invention; Figure 3 is a schematic diagram of the structure of the saltwater storage device (1) of the present invention; Figure 4 is a schematic diagram of the structure of the hemispherical evaporator (8) of the present invention; Figure 5 is a top view and a front view of the circular evaporation tank (22) of the present invention; Figure 6 is a schematic diagram of the structure of the condensation device (3) and the fresh water collection device (4) of the present invention.

[0025] Legend: 1. Brine storage device; 2. Evaporation device; 3. Condensation device; 4. Freshwater collection device; 5. Inlet pipe; 6. Inlet valve; 7. Water storage shed; 8. Hemispherical evaporator; 11. Water pump; 12. Shed support frame; 13. Transparent film; 14. Brine tank; 15. Connecting pipe; 16. Brine recovery tank. 20. Air inlet fan; 21. Water supply pipe; 22. Circular evaporation tank; 23. Hemispherical transparent cover; 24.1. Condensate outlet; 24.2. Saltwater outlet; 25. Water inlet switch; 26. Valve; 27. Saltwater outlet pipe; 28. Condensate collection pipe; 29. ​​Outer wall of evaporation tank; 30. Inner wall of evaporation tank; 31. Insulated pipe; 32. Centrifugal fan; 33. Moisture valve; 34. Vortex flow meter; 35. Underground condensate pipe; 36. Underground condensate storage tank; 37. Water outlet pipe; 38. Water pump; 39. Water pump switch. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figure 1 As shown, the saline water desalination system of the present invention, which combines a hemispherical solar distiller with underground soil condensation, consists of a saline water storage device 1, an evaporation device 2, a condensation device 3, and a fresh water collection device 4. The saline water storage device 1 provides a saline water source for the entire system. The evaporation device 2 uses the saline water pumped by the water pump 11 for natural evaporation. The centrifugal fan 32 promptly transports the generated water vapor to the underground condensation device 3 through the insulated pipe 31, where it exchanges heat with the soil underground. Finally, the generated fresh water is collected in the fresh water collection device 4.

[0028] like Figure 1 As shown in Figure 3, the saline water storage device 1 consists of a water storage arch 7, an inlet pipe 5, a water pump 11, and a water supply pipe 21. The water storage arch 7 includes an arch support 12, a transparent film 13, and a saline water tank 14. The lower part of the water storage arch 7 is a cubic saline water tank 14, which is treated to prevent leakage. The top is the arch support 12, which is fixed to the top of the four walls of the saline water tank 14. The top and sides of the arch support 12 are covered with a transparent film 13, making the entire water storage arch 7 a sealed space, which can effectively prevent water loss due to evaporation. An inlet pipe 5 is installed on one of the vertical walls of the water storage arch 7 to supply saline water, and an inlet valve 6 is installed on the inlet pipe 5. A water pump 11 is installed at the bottom of the water storage arch 7 and connected to the water supply pipe 21. The water supply pipe 21 extends out of the top of the water storage arch 7 and connects to the evaporation device 2. The arched support frame 12 is preferably made of fiberglass rod, the transparent film 13 is preferably made of polyethylene film, and the inlet pipe 5 and the supply pipe 21 are preferably made of PVC pipe. The body material of the saltwater tank 14 can be made of concrete, metal sheet or fiberglass, etc.

[0029] like Figure 1As shown in Figures 2, 4, and 5, the evaporation device 2 consists of four hemispherical evaporators 8 and a brine recovery tank 16. Each hemispherical evaporator 8 comprises a circular evaporation tank 22 and a hemispherical transparent cover 23. The circular evaporation tank 22 has inner and outer double walls. An annular space is formed between the outer wall 29 and the inner wall 30 of the evaporation tank for collecting fresh water. A condensate outlet 24.1 is located at its bottom, connected to an underground condensate storage tank 36 via a condensate collection pipe 28. The circular pool formed by the inner wall 30 of the circular evaporation tank 22 is used for brine evaporation. A brine discharge hole 24.2 is located at its bottom, connected to the brine recovery tank 16 via a brine discharge pipe 27. A hemispherical transparent cover 23 is installed on the circular evaporation tank 22 and connected and fixed to the outer wall 29, allowing the hemispherical evaporators 8 to form a light-transmitting yet sealed space, effectively improving the efficiency of brine evaporation. A water supply pipe 21 extends from the top of each hemispherical transparent cover 23 into the hemispherical evaporator 8 via a branch pipe connected to it. A water inlet switch 25 is installed on the water supply pipe 21. The horizontally arranged hemispherical evaporators 8 are connected by a connecting pipe 15, as are the longitudinally arranged hemispherical evaporators 8 near the brine storage device 1. Valves 26 are installed on all connecting pipes 15. An insulated pipe 31 connects to the condenser 3 near one of the hemispherical evaporators 8. An air intake fan 20 is connected to the last hemispherical evaporator 8 to ensure sufficient airflow within it. The hemispherical transparent cover 23 is made of transparent acrylic material through hot pressing, the circular evaporation tank 22 is made of corrosion-resistant stainless steel, and the brine discharge pipe 27, freshwater collection pipe 28, and connecting pipe 15 are preferably PVC pipes.

[0030] like Figure 1 As shown in Figure 6, the condensation device 3 consists of an insulated pipe 31, a centrifugal fan 32, a moisture valve 33, a vortex flow meter 34, and underground condenser pipes 35. The insulated pipe 31, which exits from the evaporation device 2, is installed above ground and connected in parallel with multiple underground condenser pipes 35 installed at a certain depth below ground. This utilizes the relatively constant low soil temperature to achieve a better condensation effect. The number of underground condenser pipes 35 can be adjusted according to the freshwater production requirements. The moisture valve 33, centrifugal fan 32, and vortex flow meter 34 are installed sequentially on the insulated pipe 31. Besides condensation on the transparent cover, most of the hot and humid air generated in the evaporation device 2 is discharged into the underground condenser pipes 35 by the centrifugal fan 32 for further condensation. The velocity and flow rate of the hot and humid air flowing into the pipe are regulated and controlled using the moisture valve 33, centrifugal fan 32, and vortex flow meter 34. The insulated pipe 31 is made of heat-insulated material with excellent insulation properties. The underground condenser pipe 35 includes multiple condenser pipes connected in parallel with the insulated pipe 31, and is preferably made of pipe material with good thermal conductivity.

[0031] like Figure 1 As shown in Figures 2 and 6, the freshwater collection device 4 is a semi-enclosed underground condensate storage tank 36 located at a certain depth below ground level. The tank interior is sealed and leak-proof. An underground condensate pipe 35 extends from the side of the underground condensate storage tank 36 near the condensation device 3 into the tank interior. A water pump 38 is installed at the bottom of the tank, connected to an outlet pipe 37 leading to the surface. A pump switch 39 is installed on the outlet pipe 37. The burial depth of the underground condensate storage tank 36 can be selected according to local temperature, environmental conditions, and freshwater production. The tank material can be concrete, metal sheet, or fiberglass, etc.

[0032] The following is a specific embodiment of the saline water desalination system of the present invention, which combines a hemispherical solar distiller with underground soil condensation, in the arid region of southern Xinjiang, specifically at Hongqi Farm, Kizilsu Kyrgyz Autonomous Prefecture, southern Xinjiang.

[0033] Saltwater storage device: The saline water storage device 1 consists of a cubic saline water tank 14 with a surface area of ​​4000mm × 7000mm between its four walls and an arched top with a height of 500mm. The saline water tank 14 is constructed of concrete, with a sealed and leak-proof interior. The arched top is covered with a transparent polyethylene film, forming a semi-transparent, enclosed space. This effectively prevents water loss due to evaporation and maintains a certain temperature in the saline water tank 14, which is beneficial for sufficient evaporation in the evaporation device 2. A 250W water pump is installed in the arched structure to transport the saline water from the saline water storage device 1 to the evaporation device 2. The water supply pipe 21 connected to the water pump has an outer diameter of 50mm and is made of PVC.

[0034] Evaporation device: The evaporation device 2 consists of four hemispherical evaporators 8, each composed of a circular evaporation pool 22 and a hemispherical transparent cover 23. The circular evaporation pool 22 has inner and outer double walls, forming an annular space between the outer wall 29 and the inner wall 30 for collecting fresh water. The outer diameter of the bottom circular evaporation pool 22 is 2000 mm, the inner diameter is 1900 mm, and the height of both the inner and outer double walls is 200 mm. The fresh water collection pipe 28 and the saline water discharge pipe 27 are made of PVC pipe with a 25 mm aperture. The hemispherical transparent cover 23 is made of 2000 mm diameter acrylic transparent cover with a thickness of 3 mm, and is connected and sealed to the outer wall 29 of the evaporation pool. The air inlet fan 20 has a diameter of 110 mm and an air volume of 130 m³ / h. 3 For a small fan with a capacity of / h, the water supply branch pipe of water supply pipe 21 should have a diameter of 50mm.

[0035] Condensation unit: The condensing unit 3 consists of an insulated pipe 31, a centrifugal fan 32, a moisture valve 33, a vortex flow meter 34, and an underground condenser pipe 35. The insulated pipe 31, which exits from the evaporator 2, is positioned above ground and connects to the underground condenser pipe 35, which is located at a certain depth below ground. The moisture valve 33, centrifugal fan 32, and vortex flow meter 34 are sequentially installed on the insulated pipe 31. The insulated pipe 31 is made of 90mm diameter insulated material. The underground condenser pipe 35 is buried at a depth of 1000mm. This is because long-term monitoring of the soil profile from the surface to 2000mm underground in Hongqi Farm, Kizilsu Kyrgyz Autonomous Prefecture, southern Xinjiang, revealed that the temperature variation range at 1000mm underground from May to September is 24℃-30℃. Considering infrastructure construction and the final condensing cost, the burial depth of 1000mm was determined. The slope of the buried pipe is set to 1%, the pipe length is 30m, and the pipe is a Ф200 PVC irrigation pipe. The humidifier valve 33 has a pipe diameter of 110mm, and the centrifugal fan 32 has a power of 750W and an air volume of 1200m³. 3 / h, the vortex flow meter 34 has a flow range of 130-1100m³ / h. 3 / h.

[0036] Freshwater collection device: The freshwater collection device 4 at the end of the system is a semi-enclosed underground condensate storage tank 36 located at a certain depth below ground level. The underground condensate storage tank 36 measures 2000mm × 2000mm × 2000mm and is constructed of cast concrete. An underground condenser pipe 35 extends from the side of the underground condensate storage tank 36 near the condenser device 3 into the tank body, with the pipe opening 700mm from the bottom of the tank. A water pump 38 is installed at the bottom of the tank and connected to an outlet pipe 37 leading to the surface. The entire interior of the tank is coated with a special leak-proof solution to prevent freshwater leakage. The water pump 38 has a power of 370W and a head of 16m.

[0037] The saline desalination system of this invention, after operating and producing freshwater throughout the summer of June to September 2024 in remote, water-scarce, and underdeveloped arid regions, obtained a certain amount of saline water, then generated steam in an evaporator, and collected the obtained freshwater in an underground condenser. Field tests, under the conditions of an inlet air velocity of 3 m / s and an underground pipe diameter of 110 mm, achieved a yield of 9.5 kg / m³. 2 The water production rate is 47%-78% higher than that of traditional solar distillers, which produce 2-5 kg / m² / day.

[0038] The operating principle and process of this invention: In this system, the saline water is first preheated by incident sunlight in a relatively sealed saline water storage device, ensuring that the water temperature is higher than that of the surrounding water. The water is then pumped from the storage device to the evaporator. To increase the water temperature per unit time and achieve higher water production efficiency, a suitable water depth is set in each hemispherical evaporator. Under limited sunlight conditions, the water heats up more rapidly per unit time. Furthermore, due to water's high specific heat capacity, a certain amount of fresh water can be produced even at night without sunlight. During the day, the water temperature can reach a maximum of 55-60℃, providing sufficient conditions for generating high-temperature steam. The generated steam not only condenses on the hemispherical transparent covers within the sealed hemispherical evaporators, but most of the steam is also transported by a centrifugal fan through insulated pipes connected to the evaporator to underground condensation pipes. Experimental data shows that the temperature of the underground soil meets the conditions for condensation, and the steam introduced into the pipes mixes thoroughly, undergoing sufficient heat and mass exchange with the pipe walls. The generated freshwater flows through a pipe with a 1% slope into an underground condensate storage tank, where it is collected and reused.

[0039] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A saline water desalination system combining a hemispherical solar distiller with underground soil condensation, characterized in that: The system consists of a saltwater storage device (1), an evaporation device (2), a condensation device (3), and a freshwater collection device (4); The saline water storage device (1) consists of a water storage arch (7), an inlet pipe (5), a water pump (11), and a water supply pipe (21). The water storage arch (7) consists of an arch support (12), a transparent film (13), and a saline water tank (14). The lower part of the water storage arch (7) is a cubic saline water tank (14), and the top is an arch support (12), which is fixed to the top of the four walls of the saline water tank (14). The top and sides of the arch support (12) are covered with a transparent film (13). An inlet pipe (5) is installed on one of the vertical walls of the saline water tank (14). A water pump (11) and a water supply pipe (21) are connected at the bottom of the water storage arch (7). The water supply pipe (21) passes through the top of the water storage arch (7) and connects to the evaporation device (2). The evaporation device (2) consists of several hemispherical evaporators (8) and a brine recovery tank (16); the hemispherical evaporator (8) consists of a circular evaporation tank (22) and a hemispherical transparent cover (23); the circular evaporation tank (22) is provided with inner and outer double-layered tank walls, and an annular space is formed between the outer wall (29) and the inner wall (30) of the evaporation tank. A condensate outlet hole (24.1) is provided at the bottom of the circular evaporation tank (22) and is connected to the underground condensate storage tank (36) through a condensate collection pipe (28). A brine discharge hole (24.2) is provided at the bottom between the inner walls (30) of the circular evaporation tank (22) and is connected to the brine recovery tank (16) through a brine discharge pipe (27); A hemispherical transparent cover (23) is installed on the pool (22) and is fixed to the outer wall (29) of the evaporation pool. A branch of the water supply pipe (21) is introduced into the hemispherical evaporator (8) from the top of each hemispherical transparent cover (23). The hemispherical evaporators (8) arranged horizontally are connected by a connecting pipe (15). The hemispherical evaporators (8) arranged vertically near the salt water storage device (1) are also connected by a connecting pipe (15). A valve (26) is installed on all the connecting pipes (15). An air inlet fan (20) is connected to the hemispherical evaporator (8) at the very end. An insulated pipe (31) is connected to the hemispherical evaporator (8) near the condensing device (3) and leads to the condensing device (3). The condensation device (3) consists of an insulated pipe (31), a centrifugal fan (32), a wet steam valve (33), a vortex flow meter (34), and an underground condenser pipe (35). The insulated pipe (31) that exits from the evaporation device (2) is set above the ground and connected to the underground condenser pipe (35) that is set at a certain depth below the ground. The wet steam valve (33), the centrifugal fan (32), and the vortex flow meter (34) are sequentially installed on the insulated pipe (31). The freshwater collection device (4) is a sealed underground condensate storage tank (36) set at a certain depth below the ground. The underground condensate pipe (35) enters the tank from the side wall of the underground condensate storage tank (36) near the condensate device (3). A water pump (38) is set at the bottom of the tank and connects to the outlet pipe (37) to the ground.

2. The saline water desalination system combining a hemispherical solar distiller with underground soil condensation as described in claim 1, characterized in that: An inlet valve (6) is installed on the inlet pipe (5).

3. The saline water desalination system combining a hemispherical solar distiller with underground soil condensation as described in claim 1, characterized in that: A water inlet switch (25) is installed on the water supply pipe (21).

4. The saline water desalination system combining a hemispherical solar distiller with underground soil condensation as described in claim 1, characterized in that: The underground condenser pipe (35) consists of several condenser pipes.

5. A saline water desalination system combining a hemispherical solar distiller with underground soil condensation as described in claim 1, characterized in that: A water pump switch (39) is installed on the water outlet pipe (37).

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