A non-powered hot water system with heat exchange in gallbladder under pressure

Abstract

This utility model belongs to the field of solar energy utilization technology, specifically to a tank-in-tank pressurized non-powered hot water system. It includes multiple tank-in-tank pressurized heat exchange solar water heaters connected in series and an auxiliary water tank. Each tank-in-tank pressurized heat exchange solar water heater contains a pressurized water tank and a heat exchange sub-tank within its inner tank. When the tank-in-tank pressurized heat exchange solar water heaters are connected in series, the inlet of one end tank-in-tank pressurized heat exchange solar water heater is connected to a tap water pipe, and its outlet is connected to the inlet of the next tank-in-tank pressurized heat exchange solar water heater. The outlet of the other end tank-in-tank pressurized heat exchange solar water heater is connected to the auxiliary water tank, which is connected to the user end. In this utility model, multiple tank-in-tank pressurized non-powered hot water systems are connected in series, allowing cold water to enter and hot water to exit simultaneously. Cold water enters from the bottom, and hot water exits from the top, minimizing water mixing and thus increasing heat exchange efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of solar energy utilization technology, specifically to a non-powered hot water system with a tank-in-tank heat exchange and pressurized design. Background Technology

[0002] Currently, there are non-powered water heaters on the market, most of which use straight-pipe heat exchange and coil heat exchange methods; however, the current heat exchange efficiency is relatively poor, and they lack pressurized hot water storage tanks. Furthermore, their structural design has the following shortcomings: 1. The vacuum tube is short, with a small heat collection area, resulting in less solar energy absorption. This leads to a limited temperature increase in the working fluid (such as a heat transfer fluid) inside the tube, and a small temperature difference between it and the liquid to be heated at the user end (such as cold water). In contrast, non-powered systems rely on the density difference between hot and cold fluids to drive circulation (the hot fluid with lower density rises, and the cold fluid with higher density sinks). A small temperature difference results in weak circulation power, slow or even stagnant flow of the working fluid, and ineffective heat transfer to the heat exchange end. 2. The low temperature of the working fluid inside the pipe weakens the natural circulation, slows the fluid flow, and reduces the utilization rate of the heat exchange area, ultimately making it difficult to exchange heat. 3. The size of the project also needs to be considered. If the project is small, the number of water heaters connected in series is relatively small, and the heat exchange efficiency is even lower: the overall heat output of the system is low when the number of units connected in series is small, the average temperature rise of the working fluid is limited, and the temperature difference with the user end is small; moreover, when there are few units connected in series, the total amount of working fluid in the system is small, the circulation flow is insufficient, and the heat is difficult to accumulate and transfer to the user end, resulting in low heat exchange efficiency. Summary of the Invention

[0003] This utility model provides a pressurized, non-powered hot water system with a tank-in-tank heat exchange, in order to improve heat exchange efficiency.

[0004] A non-powered hot water system with a tank-in-tank heat exchanger is characterized by comprising multiple tank-in-tank pressurized heat exchanger solar water heaters connected in series and an auxiliary water tank. The aforementioned tank-in-tank pressurized heat exchange solar water heater is equipped with a pressurized water tank, and a heat exchange tank is installed inside the inner tank. The outermost layer of the pressurized water tank is an insulation layer. Inlet and outlet are respectively provided on both sides of the pressurized water tank. Inside the pressurized water tank, elbows are connected to the inlet and outlet respectively, with the inlet elbow facing downward and the outlet elbow facing upward. Pipes are connected to the collector on both sides of the heat exchange tank, with one pipe opening downwards inside the tank and the other pipe located on the upper side of the tank space; an exhaust pipe is installed inside the upper pipe and is connected to the replenishment pipe; a safety valve is installed on the replenishment tank. When a series of pressurized heat exchange solar water heaters are connected, the inlet of the end pressurized heat exchange solar water heater is connected to the tap water pipe, and an inlet safety valve is also installed in the tap water pipe; the outlet is connected to the inlet of the next pressurized heat exchange solar water heater; the outlet of the other end pressurized heat exchange solar water heater is connected to an auxiliary water tank, and an outlet safety valve is connected to the pipeline. The auxiliary water tank is connected to the water-using end.

[0005] Furthermore, the pressurized water tank is an enamel-lined pressurized water tank.

[0006] Furthermore, the inlet safety valve is located on the outside of the inlet; the outlet safety valve is connected to the outside of the outlet.

[0007] Furthermore, the auxiliary water tank can be a heat pump water heater, a gas water heater, or a buffer water tank with electric heating function.

[0008] Furthermore, the exhaust pipe connection method is as follows: an installation hole is opened on the upper side of the end of the upper pipe, and the exhaust pipe is installed with the exhaust pipe opening facing upward; in the connecting tee between the collector and the pressurized water tank, one opening is connected to the collector, the second opening is connected to the heat exchange tank, and the third opening is connected to the replenishment tank, and the exhaust pipe is connected to the bottom of the replenishment tank from the three openings.

[0009] The beneficial effects of this utility model are: This utility model provides a tank-in-tank heat exchange pressurized non-powered hot water system, which connects a single tank-in-tank pressurized heat exchange solar water heater in series, and installs safety valves on the tap water inlet pipe and the hot water outlet pipe respectively; the safety of the system is guaranteed; after the safety valve in the hot water outlet pipe, an auxiliary water tank is connected, which has auxiliary water heating and heat storage functions.

[0010] This invention also utilizes a pressurized enamel-lined hot water tank, resulting in higher heat exchange efficiency, with all heat stored within the insulated tank. Compared to ordinary solar water heaters, which are not fully enclosed: traditional solar water heaters typically have open vents (or overflow structures directly connected to the atmosphere), and their circulation pipes are mostly non-pressurized open designs—meaning the water inside the tank and pipes is open to the atmosphere, without forming a closed pressure system, leading to faster cooling. In contrast, this invention uses multiple series-connected, tank-within-tank, pressurized, non-powered hot water systems. Cold water enters and hot water exits simultaneously, with cold water entering from the bottom and hot water exiting from the top, minimizing water mixing and thus achieving higher heat exchange efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a single-tank-in-tank pressurized heat exchange solar water heater according to this utility model. Figure 1a for Figure 1 Enlarged view of the structure of section A in the middle; Figure 2 This is a schematic diagram of the structure of Example 1; Figure 2a for Figure 2 Enlarged image in circle B; Figure 2b for Figure 2 Enlarged image within the C-shaped circle; Figure 3 This is a schematic diagram of the structure of Example 2; Figure 4 This is a schematic diagram of the structure of Example 3; In the diagram: 1. Pressurized water tank; 2. Inner tank; 3. Heat exchange tank; 4. Insulation layer; 5. Inlet; 6. Outlet; 7. Elbow; 8. Solar collector; 9. Exhaust pipe; 10. Replenishment tank; 11. Safety valve; 12. Tap water pipe; 13. Inlet safety valve; 14. Outlet safety valve; 15. Buffer tank with electric heating function; 16. Gas water heater; 17. Heat pump water heater; 18. Tee. Detailed Implementation

[0012] The technical solution of the present invention will be further explained and illustrated below through specific embodiments. Example 1

[0013] See Figure 1 , Figure 2 , Figure 2a , Figure 2b A non-powered hot water system with a tank-in-tank heat exchanger includes multiple tank-in-tank pressurized heat exchanger solar water heaters connected in series and a buffer tank 15 with electric heating function. The aforementioned tank-in-tank pressurized heat exchange solar water heater is equipped with a pressurized water tank 1, which is an enamel-lined pressurized water tank; a heat exchange tank 3 is installed inside the inner tank 2, and the outermost layer of the pressurized water tank 1 is an insulation layer 4; and an inlet 5 and an outlet 6 are respectively installed on both sides of the pressurized water tank 1. Inside the pressurized water tank 1, elbows 7 are connected to the inlet 5 and the outlet 6, with the elbow of the inlet 5 facing downward and the elbow of the outlet 6 facing upward. Pipes are connected to the collector 8 on both sides of the heat exchange tank 3, with one pipe opening downwards inside the tank and the other pipe located on the upper side of the tank space; an exhaust pipe 9 is installed inside the upper pipe and is connected to the replenishment tank 10; a safety valve 11 is installed on the replenishment tank 10. When a series of pressurized heat exchange solar water heaters are connected, the inlet of the end pressurized heat exchange solar water heater is connected to the tap water pipe 12, and an inlet safety valve 13 is also installed in the tap water pipe; the inlet safety valve 13 is located outside the inlet 5; the outlet 6 is connected to the inlet of the next pressurized heat exchange solar water heater; the outlet of the other end pressurized heat exchange solar water heater is connected to a buffer water tank 15 with electric heating function, and the outlet safety valve 14 is connected outside the outlet; and an outlet safety valve 14 is connected to the pipeline, and the buffer water tank 15 with electric heating function is connected to the water-using end. Example 2

[0014] See Figure 1 , Figure 3 A non-powered hot water system with a tank-in-tank heat exchanger includes multiple tank-in-tank pressurized heat exchanger solar water heaters and gas water heaters connected in series. The aforementioned tank-in-tank pressurized heat exchange solar water heater is equipped with a pressurized water tank 1, which is an enamel-lined pressurized water tank; a heat exchange tank 3 is installed inside the inner tank 2, and the outermost layer of the pressurized water tank 1 is an insulation layer 4; and an inlet 5 and an outlet 6 are respectively installed on both sides of the pressurized water tank 1. Inside the pressurized water tank 1, elbows 7 are connected to the inlet 5 and the outlet 6, with the elbow of the inlet 5 facing downward and the elbow of the outlet 6 facing upward. Pipes are connected to the collector 8 on both sides of the heat exchange tank 3, with one pipe opening downwards inside the tank and the other pipe located on the upper side of the tank space; an exhaust pipe 9 is installed inside the upper pipe and is connected to the replenishment tank 10; a safety valve 11 is installed on the replenishment tank 10. When a series of pressurized heat exchange solar water heaters are connected, the inlet of the end pressurized heat exchange solar water heater is connected to the tap water pipe 12, and an inlet safety valve 13 is also installed in the tap water pipe; the inlet safety valve 13 is located outside the inlet 5; the outlet 6 is connected to the inlet of the next pressurized heat exchange solar water heater; the outlet of the other end pressurized heat exchange solar water heater is connected to the gas water heater 16, and the outlet safety valve 14 is connected outside the outlet; and an outlet safety valve 14 is connected to the pipeline, and the gas water heater 16 is connected to the water-using end. Example 3

[0015] See Figure 1 , Figure 4 A non-powered hot water system with a tank-in-tank heat exchanger includes multiple tank-in-tank pressurized heat exchanger solar water heaters and heat pump water heaters connected in series 17. The aforementioned tank-in-tank pressurized heat exchange solar water heater is equipped with a pressurized water tank 1, which is an enamel-lined pressurized water tank; a heat exchange tank 3 is installed inside the inner tank 2, and the outermost layer of the pressurized water tank 1 is an insulation layer 4; and an inlet 5 and an outlet 6 are respectively installed on both sides of the pressurized water tank 1. Inside the pressurized water tank 1, elbows 7 are connected to the inlet 5 and the outlet 6, with the elbow of the inlet 5 facing downward and the elbow of the outlet 6 facing upward. Pipes are connected to the collector 8 on both sides of the heat exchange tank 3, with one pipe opening downwards inside the tank and the other pipe located on the upper side of the tank space; an exhaust pipe 9 is installed inside the upper pipe and is connected to the replenishment tank 10; a safety valve 11 is installed on the replenishment tank 10. When a series of pressurized heat exchange solar water heaters are connected, the inlet of the end pressurized heat exchange solar water heater is connected to the tap water pipe 12, and an inlet safety valve 13 is also installed in the tap water pipe; the inlet safety valve 13 is located outside the inlet 5; the outlet 6 is connected to the inlet of the next pressurized heat exchange solar water heater; the outlet of the other end pressurized heat exchange solar water heater is connected to the heat pump water heater 17, and the outlet safety valve 14 is connected outside the outlet; the outlet safety valve 14 is also connected to the pipeline, the heat pump water heater 17 is connected to the water-using end, and an outdoor unit is also connected to the heat pump water heater 17. Example 4

[0016] The exhaust pipe connection method described in Example 1 is as follows: an installation hole is opened on the upper side of the end of the upper pipe, and the exhaust pipe 9 is installed with its opening facing upward; the connecting tee 18 between the collector and the pressurized water tank has one opening connected to the collector 8, two openings connected to the heat exchange tank 3, and three openings connected to the replenishment tank 10, and the exhaust pipe 9 is connected to the bottom of the replenishment tank 10 from the three openings.

[0017] In use, the solar collector 8 absorbs solar energy and collects heat, which then exchanges heat with the water in the pressurized water tank 1 through the heat exchange tank 3, raising the water temperature. When the user turns on the water supply, tap water enters the system under its own pressure, pushing the heated water in the pressurized water tank along the pipeline to the auxiliary water tank. The auxiliary water tank receives and stores the hot water, while maintaining its temperature through its own insulation structure for daily use. In case of cloudy days, nights, or other conditions without sunlight, the hot water stored in the auxiliary water tank is used first. When the temperature of the hot water in the auxiliary water tank is lower than the set value (or the water volume is insufficient), the heating function of the auxiliary water tank (such as electric heating, heat pump, etc.) can be manually or automatically activated through a temperature control device to heat the water to the set temperature, ensuring water demand.

Claims

1. A pressurized, non-powered hot water system with a tank-in-tank heat exchanger, characterized in that, It includes multiple tank-in-tank pressurized heat exchange solar water heaters connected in series and an auxiliary water tank; The aforementioned tank-in-tank pressurized heat exchange solar water heater is equipped with a pressurized water tank, and a heat exchange tank is installed inside the inner tank. The outermost layer of the pressurized water tank is an insulation layer. Inlet and outlet are respectively provided on both sides of the pressurized water tank. Inside the pressurized water tank, elbows are connected to the inlet and outlet respectively, with the inlet elbow facing downward and the outlet elbow facing upward. Pipes are connected to the collector on both sides of the heat exchange tank, with one pipe opening downwards inside the tank and the other pipe located on the upper side of the tank space; an exhaust pipe is installed inside the upper pipe and is connected to the replenishment pipe; a safety valve is installed on the replenishment tank. When a series of pressurized heat exchange solar water heaters are connected, the inlet of the end pressurized heat exchange solar water heater is connected to the tap water pipe, and an inlet safety valve is also installed in the tap water pipe; the outlet is connected to the inlet of the next pressurized heat exchange solar water heater; the outlet of the other end pressurized heat exchange solar water heater is connected to an auxiliary water tank, and an outlet safety valve is connected to the pipeline. The auxiliary water tank is connected to the water-using end.

2. The pressurized, non-powered hot water system with heat exchange in a tank-within-a-tank configuration according to claim 1, characterized in that, The pressurized water tank is an enamel-lined pressurized water tank.

3. The pressurized, non-powered hot water system with heat exchange in a tank-within-a-tank configuration according to claim 1, characterized in that, The inlet safety valve is located on the outside of the inlet; the outlet safety valve is connected to the outside of the outlet.

4. The pressurized, non-powered hot water system with heat exchange in a tank-within-a-tank configuration according to claim 1, characterized in that, The auxiliary water tank is a heat pump water heater, a gas water heater, or a buffer water tank with electric heating function.

5. The pressurized, non-powered hot water system with heat exchange in a tank-within-a-tank configuration according to claim 1, characterized in that, The exhaust pipe connection method is as follows: an installation hole is opened on the upper side of the end of the upper pipe, and the exhaust pipe is installed with the exhaust pipe opening facing upward; the connecting tee between the collector and the pressurized water tank has one opening connected to the collector, two openings connected to the heat exchange tank, and three openings connected to the replenishment tank, and the exhaust pipe is connected to the bottom of the replenishment tank from the three openings.

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