A heat exchange system for preventing solar collectors from freezing and hot water pipes from scaling

Abstract

The present application relates to a heat exchange system for preventing a solar collector from freezing and a hot water pipe from scaling, and belongs to the technical field of solar water heating systems; the system comprises a solar water heater, a heat exchange tank, and a circulation pipeline connecting the solar water heater and the heat exchange tank; the heat exchange tank comprises a tank body, and a first heat exchange component and a second heat exchange component arranged inside the tank body; the circulation pipeline is connected to the first heat exchange component, and the second heat exchange component is connected to an indoor water pipe; the tank body is filled with a heat-conducting medium, and the circulation pipeline is filled with an antifreeze circulation medium. The present application has the effect of preventing the solar water heater from freezing and the hot water pipe from scaling.

Description

Technical Field

[0001] The present application relates to the technical field of solar water heating systems, and in particular to a heat exchange system for preventing solar collectors from freezing and hot water pipes from scaling. Background Art

[0002] A solar water heating system is a device that heats water by collecting solar radiation through a collector. It is currently the most technologically mature, most economically valuable, and widely used device in the field of solar thermal energy applications.

[0003] Regarding the above-mentioned related technologies, the inventors believe that the ordinary solar water pipes of traditional solar water heaters are prone to freezing under winter night weather conditions or in high-altitude cold areas, and may even freeze as a whole, causing the water pipes to freeze and crack; on the other hand, because raw water directly enters the glass pipes of the solar water heater, scale is easily generated at high temperatures. The thermal conductivity of scale is poor and it is also inconvenient to clean. Summary of the invention

[0004] In order to prevent the problem of freezing of solar water heaters and scaling in hot water pipes in low temperature environments, the present application provides a heat exchange system that prevents freezing of solar collectors and scaling of hot water pipes.

[0005] The present application provides a heat exchange system for preventing solar collectors from freezing and hot water pipes from scaling, using the following technical solutions:

[0006] A heat exchange system for preventing a solar collector from freezing and a hot water pipe from scaling, comprising a solar water heater, a heat exchange tank, and a circulation pipeline connecting the solar water heater and the heat exchange tank;

[0007] The water exchange tank comprises a tank body and a first heat exchange element and a second heat exchange element arranged inside the tank body, the circulation pipeline is connected to the first heat exchange element, and the second heat exchange element is connected to the indoor water pipeline;

[0008] The tank is filled with heat transfer medium, and the circulation pipeline is filled with antifreeze circulation medium.

[0009] By adopting the above technical solution, the first heat exchange element and the solar water heater are connected through a circulation pipeline, and heat is conducted through an antifreeze circulation medium, which can reduce the probability of ice forming on the hot water pipe in the solar water heater; indoor water enters the second heat exchange element, the first heat exchange element and the second heat exchange element are not connected to each other, and the first heat exchange element and the second heat exchange element exchange heat in the tank body, so that raw water for indoor water use will not enter the solar water heater, thereby preventing scale from being generated inside the pipe of the solar water heater.

[0010] Optionally, the heat-conducting medium in the tank body is softened pure water.

[0011] By adopting the above technical solution, the heat transfer medium in the tank body is softened pure water. After the softened pure water is subjected to high temperature, no scale will be generated on the inner wall of the tank body, thereby further preventing the generation of scale.

[0012] Optionally, a gas discharge pipe is fixedly connected to the tank body.

[0013] By adopting the above technical solution, the gas unloading pipe can achieve the purpose of unloading gas. The softened pure water in the tank body will produce water vapor after heating, which will cause the pressure in the tank body to increase. The gas unloading pipe can prevent the pressure in the tank body from increasing and avoid danger.

[0014] Optionally, a liquid inlet pipe is fixedly connected to the upper surface of the tank body, and a liquid outlet pipe is fixedly connected to the lower surface of the tank body. Control valves are fixedly provided on the liquid inlet pipe, the liquid outlet pipe and the gas discharge pipe.

[0015] By adopting the above technical solution, it is convenient to load softened pure water into the tank body. At the same time, when the evaporation of softened pure water decreases, softened pure water can be supplemented through the liquid inlet pipe to avoid too little softened pure water in the tank body, thereby preventing the heat transfer from being affected.

[0016] Optionally, the first heat exchange element and the second heat exchange element are both coils.

[0017] By adopting the above technical solution, the coil can increase the path and time for the antifreeze circulating medium and indoor water to flow in the tank, thereby improving the heat exchange efficiency between the first heat exchange element and the second heat exchange element.

[0018] Optionally, an electric heating assembly is also installed on the tank body, and the electric heating assembly is composed of a plurality of heating rods extending into the interior of the tank body.

[0019] By adopting the above technical solution, when the weather is bad and the heating efficiency of the solar water heater is poor, the electric heating component can perform auxiliary heating to facilitate the use of hot water. The electric heating component is located on the heat exchange tank to heat the softened pure water and indirectly heat the indoor water, thereby avoiding the formation of scale on the heating rod.

[0020] Optionally, the antifreeze circulating medium may be any one of antifreeze liquid, ethylene glycol, and glycerol.

[0021] By adopting the above technical solution, the antifreeze circulation medium can be any one of antifreeze liquid, ethylene glycol and propylene glycol, which can transfer heat without generating ice and has low cost.

[0022] Optionally, the second heat exchanger is connected to a temperature control pipeline, and the indoor water pipeline and the temperature control pipeline are both connected to the second heat exchanger;

[0023] The temperature control pipeline includes a water tank and a hot water pipe and a cold water pipe fixedly connected to the water tank. A water pump is fixedly arranged on the cold water pipe. A temperature sensor is fixedly arranged on the second heat exchange element. The temperature sensor is electrically connected to the water pump.

[0024] By adopting the above technical solution, the temperature control pipeline can control the temperature inside the second heat exchange element so that the temperature inside the second heat exchange element does not exceed 60°, thereby reducing the probability of scale generation in the pipeline of the second heat exchange element.

[0025] Optionally, the interior of the water storage tank is fixedly connected to the partition, dividing the interior of the water storage tank into a hot water area and a cold water area;

[0026] The height of the partition is two-thirds of the height of the water tank.

[0027] By adopting the above technical solution, the partition isolates the hot water and cold water inside the water tank, and the water pump replenishes the cold water into the second heat exchange element. The hot water inside the second heat exchange element enters the hot water area without affecting the cold water. When the water level in the hot water area is too high, it overflows to the cold water area through the partition, and the water flow in the hot water area slowly enters the cold water area, which will not cause the temperature of the cold water to rise too high, so that the cold water can control the temperature inside the second heat exchange element.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The solar water heater is connected to the first heat exchanger through a circulation pipeline, and the indoor water pipeline is connected to the second heat exchanger. The first heat exchanger and the second heat exchanger exchange heat in the heat exchange tank and are not connected to each other. The circulation pipeline is filled with an antifreeze circulation medium, thereby preventing the solar water heater from freezing. At the same time, indoor water will not directly enter the solar water heater, so that the pipeline inside the solar water heater will not freeze;

[0030] 2. The heat exchange tank is filled with softened pure water, which will cause scale to form on the inner wall of the heat exchange tank. An electric heating component is installed inside the tank to provide auxiliary heating. When the heating efficiency of the solar water heater is poor due to weather, the electric heating component will provide auxiliary heating.

[0031] 3. The second heat exchanger is also connected to a temperature control pipeline, which can limit the temperature of the second heat exchanger so that the indoor water temperature inside the second heat exchanger does not exceed 60°, thereby further reducing the probability of scale generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of the heat exchange system in the embodiment.

[0033] Explanation of the reference numerals: 1. Solar water heater; 11. Circulation pipeline; 2. Heat exchange tank; 21. Tank body; 211. Air discharge pipe; 212. Liquid inlet pipe; 213. Liquid outlet pipe; 214. Control valve; 22. First heat exchange element; 23. Second heat exchange element; 231. Temperature sensor; 24. Electric heating assembly; 25. Base; 3. Indoor water pipeline; 4. Temperature control pipeline; 41. Water storage tank; 42. Cold water pipe; 421. Solenoid valve; 43. Hot water pipe; 44. Water pump; 45. Partition; 46. Cold water area; 47. Hot water area. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1 This application is described in further detail.

[0035] A solar water heater is a heating device that converts sunlight energy into thermal energy, heating water from low temperature to high temperature to meet people's needs for hot water in life and production. It is mainly a vacuum pipe type solar water heater. A vacuum pipe type household solar water heater is composed of a heat collection pipe, a water storage tank, a bracket and other related parts. The conversion of solar energy into thermal energy mainly relies on a vacuum heat collection pipe. The vacuum heat collection pipe uses the principle that hot water floats and cold water sinks to create a microcirculation of water to obtain the required hot water.

[0036] The present application discloses a heat exchange system for preventing ice formation in solar collectors and scaling in hot water pipes. Figure 1 The heat exchange system includes a solar water heater 1, a heat exchange tank 2 and an indoor water pipe 3; the heat exchange tank 2 includes a tank body 21 and a first heat exchange element 22 and a second heat exchange element 23 arranged in the tank body 21; a circulation pipeline 11 is arranged between the solar water heater 1 and the first heat exchange element 22, the circulation pipeline 11 connects the solar water heater 1 and the first heat exchange element 22, and the circulation pipeline 11 is filled with an antifreeze circulation medium, and the second heat exchange element 23 is connected to the indoor pipe 3; the solar water heater 1 transfers heat to the first heat exchange element 22 through the antifreeze circulation medium In the component 22, the first heat exchange component 22 and the second heat exchange component 23 exchange heat in the heat exchange tank 2, and the first heat exchange component 22 and the second heat exchange component 23 will not be connected, so indoor water will not directly enter the solar water heater 1, thereby achieving the purpose of preventing the solar water heater from generating scale, and the solar water heater 1 adopts an antifreeze circulating medium to transfer heat, thereby achieving the purpose of preventing the solar water heater 1 from freezing, and the circulation pipeline 11 is a closed pipeline, and external impurities will not enter, thereby avoiding the generation of scale inside the solar water heater 1.

[0037] Reference Figure 1The antifreeze circulation medium can be any one of antifreeze liquid, ethylene glycol, and propylene glycol, which can transfer heat and achieve the purpose of antifreeze. At the same time, the cost is cleared and will not lead to excessive costs. The tank body 21 is filled with softened pure water, which is used as the heat transfer medium inside the heat exchange tank 2, thereby preventing scale from being generated inside the tank body 21 and reducing the number of times the heat exchange tank 2 is cleaned.

[0038] Reference Figure 1 The upper surface of the tank body 21 is also fixedly connected with an air discharge pipe 211 and a liquid inlet pipe 212, and the lower surface of the tank body 21 is fixedly connected with a liquid outlet pipe 213; when softened pure water is heated, water vapor will be generated, causing the air pressure inside the tank body 21 to increase, and the air discharge pipe 211 can discharge water vapor so that the air pressure inside the tank body 21 will not be too high, thereby avoiding danger. Softened pure water can be added to the tank body 21 through the liquid inlet pipe 212, and the liquid outlet pipe 213 is convenient for discharging the soft pure water inside the tank body 21 and replacing it with new softened pure water.

[0039] Reference Figure 1 The air unloading pipe 211, the liquid inlet pipe 212 and the liquid outlet pipe 213 are all fixedly provided with a control valve 214, and the control valve 214 can control the connection or closing of the air unloading pipe 211, the liquid inlet pipe 212 and the liquid outlet pipe 213, so as to facilitate the control of the use of the air unloading pipe 211, the liquid inlet pipe 212 and the liquid outlet pipe 213.

[0040] Reference Figure 1 The first heat exchange element 22 and the second heat exchange element 23 are both coils, which can increase the path and time for the antifreeze circulating medium and indoor water to flow in the tank body 21, thereby improving the efficiency of heat exchange.

[0041] Reference Figure 1 An electric heating component 24 is also installed on the tank body 21. The electric heating component 24 is composed of a plurality of heating rods, and the heating rods extend into the tank body 21. When the solar water heater has a poor heating effect due to the influence of weather, the electric heating component 24 starts to heat the softened pure water inside the tank body 21, thereby achieving the purpose of auxiliary heating and facilitating the heating of indoor water. At the same time, the electric heating component 24 heats the softened pure water to indirectly heat the indoor water, which can avoid the formation of scale on the heating rods.

[0042] Reference Figure 1 The lower surface of the tank body 21 is also fixedly connected with a base 25, and the base 25 can support the tank body 21, thereby facilitating the installation of the tank body 21.

[0043] Reference Figure 1The second heat exchanger 23 is also fixedly connected to a temperature control pipeline 4, which includes a water storage tank 41 and a cold water pipe 42 and a hot water pipe 43 fixedly connected to the water storage tank 41; the cold water pipe 42 and the hot water pipe 43 are respectively fixedly connected to the water inlet and the water outlet of the second heat exchanger 23; a water pump 44 is also fixedly arranged on the cold water pipe 42; a temperature sensor 231 is fixedly connected to the second heat exchanger 23, and the temperature sensor 231 and the water pump 44 are electrically connected. When the temperature of the indoor water inside the second heat exchanger 23 exceeds 60°, the temperature sensor 231 senses and transmits a signal to the control system of the water pump 44, and the water pump 44 starts to pump the cold water in the water storage tank 41 into the second heat exchanger 23, and replaces the hot water in the second heat exchanger 23, thereby completing the purpose of cooling the second heat exchanger 23, so that the temperature of the second heat exchanger 23 will not exceed 60°, which can reduce the probability of scale generation in the second heat exchanger 23.

[0044] Reference Figure 1 The cold water pipe 42 and the hot water pipe 43 are both provided with an electromagnetic valve 421. When the water pump 44 is started or stopped, the electromagnetic valve 421 is opened or closed synchronously, thereby completing the hot water replacement inside the second heat exchange element 23. When it is not started again, the second heat exchange element 23 can be prevented from transferring heat to the water storage tank 41.

[0045] Reference Figure 1 , a partition 45 is fixedly connected inside the water tank 41, and the partition 45 divides the inside of the water tank 41 into two parts: a cold water area 46 and a hot water area 47. The cold water pipe 42 is connected to the cold water area 46, and the hot water pipe 43 is connected to the hot water area 47. The hot water area 47 and the cold water area 46 are isolated from each other. The hot water replaced by the second heat exchanger 23 first enters the hot water area 47, and will not affect the cold water in the cold water area 46, so that the temperature of the water entering the second heat exchanger 23 will not be too high; the height of the partition 45 is two-thirds of the height of the water tank 41, so the water in the hot water area 47 can overflow into the cold water area 46, so that the water in the water tank 41 can be recycled. The temperature control pipeline 4 will not be started all the time, so the water in the water tank 41 will cool naturally, and the hot water replaced by the second heat exchanger 23 will fall into the hot water area 47, undergo preliminary cooling, and then flow into the cold water area 46, so that the water temperature in the cold water area 46 can be reduced as much as possible.

[0046] The implementation principle of the heat exchange system for preventing the freezing of solar collectors and the scaling of hot water pipes in the embodiment of the present application is as follows: the heat collection pipeline on the solar water heater 1 heats the antifreeze circulating medium, and the antifreeze circulating medium flows in the circulating pipeline 11, transferring heat to the first heat exchange element 22. The first heat exchange element 22 is in the heat exchange tank 2, thereby increasing the temperature of the softened pure water inside the heat exchange tank 2, and the indoor water enters the second heat exchange element 23 in the heat exchange tank 2 through the indoor pipeline, and heat exchange with the softened pure water is achieved through the second heat exchange element 23, thereby achieving the purpose of heating the indoor water.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A heat exchange system for preventing freezing of a solar collector and scaling of a hot water pipe (43), characterized in that: It comprises a solar water heater (1), a water exchange tank, and a circulation pipeline (11) connecting the solar water heater (1) and the water exchange tank; The water exchange tank comprises a tank body (21) and a first heat exchange element (22) and a second heat exchange element (23) arranged inside the tank body (21); the circulation pipeline (11) is connected to the first heat exchange element (22), and the second heat exchange element (23) is connected to the indoor water pipeline (3); The tank (21) is filled with a heat-conducting medium, and the circulation pipeline (11) is filled with an antifreeze circulation medium; The tank body (21) is also fixedly connected with a gas discharge pipe (211); The upper surface of the tank body (21) is fixedly connected with a liquid inlet pipe (212), the lower surface of the tank body (21) is fixedly connected with a liquid outlet pipe (213), and the liquid inlet pipe (212), the liquid outlet pipe (213) and the gas discharge pipe (211) are all fixedly provided with a control valve (214); The first heat exchange element (22) and the second heat exchange element (23) are both coils; The tank body (21) is also provided with an electric heating assembly (24), which is composed of a plurality of heating rods extending into the tank body (21); The second heat exchange element (23) is connected to a temperature control pipeline (4), and the indoor water pipeline (3) and the temperature control pipeline (4) are both connected to the second heat exchange element (23); The temperature control pipeline (4) comprises a water storage tank (41) and a hot water pipe (43) and a cold water pipe (42) fixedly connected to the water storage tank (41); a water pump (44) is fixedly arranged on the cold water pipe (42); a temperature sensor (231) is fixedly arranged on the second heat exchange element (23); and the temperature sensor (231) and the water pump (44) are electrically connected.

2. A heat exchange system for preventing icing of a solar collector and scaling of a hot water pipe (43) according to claim 1, characterized in that: The heat-conducting medium in the tank body (21) is softened pure water.

3. A heat exchange system for preventing icing of a solar collector and scaling of a hot water pipe (43) according to claim 1, characterized in that: The antifreeze circulating medium is antifreeze liquid.

4. A heat exchange system for preventing icing of a solar collector and scaling of a hot water pipe (43) according to claim 1, characterized in that: The interior of the water storage tank (41) is fixedly connected to a partition (45), and the partition (45) divides the interior of the water storage tank (41) into a hot water area (47) and a cold water area (46); The height of the partition (45) is two-thirds of the height of the water storage tank (41).

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