Heat exchange system with variable heat absorption area

Abstract

The invention provides a heat exchange system capable of changing the heat absorption area, the system comprises a loop heat pipe, the loop heat pipe comprises a plurality of straight pipes arranged in parallel, first bent pipes and second bent pipes, the first bent pipes and the second bent pipes are connected with the upper ends and the lower ends of the adjacent straight pipes, and the first bent pipes and the second bent pipes are alternately arranged, so that a series connection structure is formed between the straight pipes and the bent pipes; the loop heat pipe comprises an evaporation part, and the evaporation part comprises a second bent pipe and a part of a straight pipe connected with the second bent pipe; the heat exchange system is characterized by further comprising a bypass pipe arranged at the upper end of the second bent pipe, the bypass pipe is communicated with an adjacent straight pipe connected with the second bent pipe, a first valve is arranged on the second bent pipe, a second valve is arranged on the bypass pipe, and when the heat exchange system works, at least one of the first valve and the second valve is in an open state. The size of the heat exchange area participating in heat absorption and the flow of fluid can be adjusted through opening and closing and the opening degree of the first valve and the second valve, and therefore the output temperature is automatically controlled.

Description

Technical Field

[0001] The present invention relates to a heat exchanger, and more particularly to a heat pipe heat exchange system with variable heat absorption area. Background Art

[0002] The heat pipe technology, an efficient phase change heat transfer element, originated in 1963 and was invented by George Grover of the Los Alamos National Laboratory in the United States. It makes full use of the principle of heat conduction and the rapid heat transfer property of the phase change medium. Through the heat pipe, the heat of the heat-generating object is quickly transferred outside the heat source, and its heat conduction ability exceeds that of any known metal.

[0003] The loop heat pipe is an extension of the traditional heat pipe technology and is an efficient two-phase heat transfer device. The evaporator and the condenser are connected into a loop through the steam pipeline and the liquid pipeline. Only the capillary force provided by the capillary core is used to drive the circulation of the working fluid in the pipe, and no additional energy consumption is required to transfer heat by the phase change of the working fluid. The structural characteristics of the loop heat pipe are: the steam pipeline and the liquid pipeline are separated, and the evaporator and the compensator are integrated. Due to the compact structure, the gas-liquid carrying resistance is small, the start-up is fast and flexible, and it has good heat transfer ability, convenient installation, long-distance heat transfer and other characteristics, and is widely used in many fields such as military, aerospace, and electronic equipment.

[0004] The loop heat pipe is a heat management technology gradually developed based on the separated heat pipe technology, including an evaporator, a condenser, and steam and liquid pipelines. The evaporator of the loop heat pipe includes a compensation chamber and a steam chamber. The compensation chamber and the steam chamber are connected by a capillary core, and the capillary force provided by the capillary core is used to drive the circulation of the working fluid. Compared with the traditional heat pipe, the more reasonable capillary structure arrangement and design in the LHP and the separated gas-liquid pipelines greatly improve its heat transfer distance and system reliability, reduce the circulation resistance of the working fluid inside the system and the volume size of the system, and can realize the heat management work in complex spaces.

[0005] At present, in the heat absorption of the loop heat pipe, the heat absorption area is fixed, so that the temperature of the fluid output at the condensation end cannot change either, or to make the temperature of the fluid passing through the condensation end change, some improvements need to be made at the condensation end, making the structure complex. The present application makes improvements in this regard by controlling the heat absorption area of the fluid in the evaporation part, so as to correspondingly control the output temperature. Summary of the Invention

[0006] In order to overcome the defects and deficiencies existing in the prior art, the present invention provides a heat exchange system with variable heat absorption area, which can automatically control the heat exchange area of the evaporation part.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows: A heat exchange system with a variable heat absorption area, the system comprising a loop heat pipe, the loop heat pipe including a plurality of straight pipes arranged in parallel and first elbows and second elbows connecting the upper and lower ends of adjacent straight pipes, the first elbows and the second elbows being alternately arranged, so that a series structure is formed between the straight pipes and the elbows; the loop heat pipe includes an evaporation section, the evaporation section including a second elbow and a part of the straight pipe connected to the second elbow; characterized in that it further includes a bypass pipe provided at the upper end of the second elbow, the bypass pipe communicating with the adjacent straight pipe connected to the second elbow, a first valve is provided on the second elbow, a second valve is provided on the bypass pipe, and when the heat exchange system is working, at least one of the first valve and the second valve is in an open state.

[0008] As an improvement, a bypass pipe is provided at the upper end of each second elbow.

[0009] As an improvement, the loop heat pipe includes a condensation section, the condensation section releasing heat to the outside for heating a fluid, and the temperature of the heated fluid is controlled by controlling the opening and closing and the opening degree of the first valve and the second valve.

[0010] As an improvement, if the temperature of the fluid needs to be increased, the opening degree of the first valve is controlled to increase and the opening degree of the second valve is decreased.

[0011] As an improvement, if the temperature of the fluid needs to be decreased, the opening degree of the first valve is controlled to decrease and the opening degree of the second valve is increased.

[0012] As an improvement, the loop heat pipe includes an upper connecting pipe connecting the upper ends of the two leftmost and rightmost straight pipes, and the straight pipes, elbows and the upper connecting pipe form a series structure, so that the loop heat pipe fluid flows inside the series structure.

[0013] As an improvement, the condensation section includes the upper connecting pipe, the upper part of the straight pipe and the first elbow.

[0014] As an improvement, the loop heat pipe is a pulsating heat pipe.

[0015] As an improvement, the condensation section is used for heating air.

[0016] As an improvement, the evaporation section absorbs the waste heat of the flue gas.

[0017] Compared with the prior art, the present invention has the following advantages: By providing a bypass pipe bypassing the second elbow and providing a first valve and a second valve on the second elbow and the bypass pipe, the heat exchange area of the fluid in the evaporation section is controlled by controlling the closing of the first valve and the second valve, and by controlling the opening degree of the first valve and the second valve, the flow rate of the fluid participating in different heat exchange areas can be adjusted, so as to automatically control the output temperature. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the background technology loop heat pipe of the present invention; Figure 2 It is a schematic diagram of the loop heat pipe structure of the present invention; Figure 3 It is a schematic diagram of the pulsating heat pipe system with an air water tank set by the present invention; Figure 4 It is a schematic diagram of the preferred fluid flow direction structure of the pulsating heat pipe system of the present invention. Specific embodiments

[0019] The following will make a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings.

[0020] In this article, if there is no special description, when it comes to formulas, " / " represents division, and "×", "*" represent multiplication.

[0021] It should be noted that, if there is no special description, the orientation terms "upper", "lower", "left", "right", "vertical", "horizontal" of the present invention do not represent the true orientation, but are only for the convenience of expression. Among them, the four terms "upper", "lower", "left", "right" respectively represent Figure 1 the "upper", "lower", "left", "right" four positions of the pulsating heat pipe in Figure 1 The "vertical" and "horizontal" directions of the pulsating heat pipe from the front view angle of

[0022] Figures 2 - 4 shows a heat exchange system with a variable heat absorption area. As Figure 2 shown, a heat exchange system with a variable heat absorption area, the system includes a loop heat pipe, the loop heat pipe includes a plurality of straight pipes 1 arranged in parallel and first elbows 2 and second elbows 3 connecting the upper and lower ends of adjacent straight pipes, the first elbows 2 and the second elbows 3 are arranged alternately, so that a series structure is formed between the straight pipes and the elbows; the loop heat pipe includes an evaporation part, the evaporation part includes the second elbow 3 and a part of the straight pipe 1 connected to the second elbow 3; the evaporation part further includes a bypass pipe 4 arranged at the upper end of the second elbow 3, the bypass pipe 4 communicates with the adjacent straight pipe connected to the second elbow, a first valve 5 is arranged on the second elbow, a second valve 6 is arranged on the bypass pipe, when the heat exchange system is working, at least one of the first valve 5 and the corresponding second valve 6 in the same adjacent straight pipe is in an open state.

[0023] In the present invention, a bypass pipe is provided to bypass the second elbow pipe, and a first valve and a second valve are provided on the second elbow pipe and the bypass pipe. By controlling the closing of the first valve and the second valve, the heat exchange area of the fluid in the evaporation section is controlled. By controlling the opening degrees of the first valve and the second valve, the flow rate of the fluid participating in different heat exchange areas can be adjusted, thereby automatically controlling the output temperature.

[0024] As an improvement, a bypass pipe is provided at the upper end of each second elbow pipe. During operation, at least one of the first valve 5 and the second valve 6 in each adjacent straight pipe is in an open state. When the maximum heat exchange area is required, the first valve 5 is closed and the second valve 6 is fully opened, that is, the opening degree is 100%. When the minimum heat exchange area is required, the first valve 5 is fully opened, that is, the opening degree is 100%, and the second valve 6 is closed.

[0025] By providing a bypass pipe at the upper end of each second elbow pipe, the adjustable range of the heat exchange area is larger, so that the output temperature range is wider.

[0026] As an improvement, a control system is provided. The control system is data-connected to the first valve 5 and the second valve 6 for controlling the opening and closing and the opening degrees of the first valve and the second valve.

[0027] As an improvement, the loop heat pipe includes a condensation section that releases heat to the outside and is used to heat the fluid. By controlling the opening and closing and the opening degrees of the first valve and the second valve, the temperature of the heated fluid is controlled.

[0028] As an improvement, if the temperature of the fluid needs to be increased, the opening degree of the first valve is controlled to increase and the opening degree of the second valve is decreased.

[0029] As an improvement, if the temperature of the fluid needs to be decreased, the opening degree of the first valve is controlled to decrease and the opening degree of the second valve is increased.

[0030] As an improvement, the loop heat pipe includes an upper connecting pipe 6 connecting the upper ends of the two straight pipes on the leftmost and rightmost sides. The straight pipes, elbow pipes, and upper connecting pipe form a series structure, so that the loop heat pipe fluid flows inside the series structure.

[0031] As an improvement, the condensation section includes an upper connecting pipe 8, the upper part of the straight pipe, and the first elbow pipe 2.

[0032] As an improvement, the loop heat pipe is a pulsating heat pipe.

[0033] As an improvement, the condensation part is used to heat cold water. As an improvement, the evaporation part absorbs the waste heat of the flue gas. The loop heat pipe is arranged in the boiler system, where the evaporation part is arranged in the flue 9 and the condensation part is arranged in the water tank 7, and cold water circulates in the water tank. The heated cold water is provided to users, thereby saving energy. Users can input the required temperature at the user end. The control system receives the user input temperature and controls the opening and closing and opening degrees of the first valve and the second valve to heat the cold water in the water tank to the user input temperature.

[0034] A temperature sensor is arranged to detect the temperature of the water output from the water tank, and the temperature sensor is connected to the control system for data.

[0035] If the number of the second elbows is n, then the number of the first valve and the second valve are both n. Then, a method for intelligently controlling the heat exchange area of the above heat exchange system includes the following steps: 1. Fully open m of the first valves and close n - m of them. At the same time, close m of the second valves in the bypass pipes in the same adjacent straight pipe corresponding to the first valves and fully open n - m of them. Then, in the same adjacent straight pipe, one of the first valve and the second valve is fully open and the other is closed. Measure the temperature of the water output from the water tank, and store the temperature of the water output from the water tank and the opening and closing states of the first valve and the second valve into the first database. 2. Let m take values from 1 to n in sequence to obtain n groups of data. The temperature data of the water and the opening and closing states of the first valve and the second valve measured in the n groups of data are stored into the first database in sequence, so as to obtain the temperature of the water output from the water tank when the first valve and the second valve are fully open and closed. 3. The user inputs the required temperature data at the user end, and the control system automatically retrieves the temperature data in the first database when receiving the temperature data. 4. If the user's temperature data is the same as a certain temperature data in the first database, directly retrieve the corresponding opening and closing states of the first valve and the second valve, so as to directly output the required temperature data. 5. If the user's temperature data is different from all the temperature data in the first database, retrieve two temperature data in the first database so that the user temperature data is between the two temperature data. Then, by adjusting the opening degrees of the first valve and the second valve corresponding to the two temperature data, the required temperature data is output.

[0036] As an improvement, the first valve corresponding to the larger temperature data among the two temperature data selected in the first database is in the fully open state. As an improvement, reduce the opening degree of the first valve, open the second valve at the same time, and adjust the opening degree of the second valve to output the required temperature data.

[0037] As an improvement, the first valve corresponding to the two temperature data with smaller values in the selected first database is in a fully closed state. As an improvement, the opening degree of the second valve is reduced, while the first valve is opened, and the opening degree of the first valve is adjusted, so as to output the required temperature data.

[0038] As an improvement, during operation, the temperature of the water output from the water tank, the opening and closing states and the opening degrees of the first valve and the second valve are stored in the first database. By continuously storing the operation data in the first database, when the user needs new temperature data subsequently, the corresponding temperature data in the database and the opening and closing states and the opening degrees of the corresponding first valve and second valve can be directly retrieved, so as to quickly achieve the output of the temperature. As the number of operations increases, the data in the database becomes more and more, and the output temperature will be more and more accurate.

[0039] As an improvement, when the temperature data corresponding to the detected states of the first valve and the second valve changes, the new temperature data is stored in the first database to replace the past temperature data, so as to achieve continuous correction.

[0040] As an improvement, as Figure 4 shown, the water tank 7 is divided into an upper water tank 71 and a lower water tank 72 that are independent of each other by a partition plate 10. The upper water tank and the lower water tank respectively have a fluid outlet and a fluid inlet. The first elbow pipe is arranged in the lower water tank, and the upper connecting pipe 8 is arranged in the upper water tank. The water heated in the upper water tank and the lower water tank is mixed and then conveyed to the user. The temperature sensor detects the temperature of the water heated in the upper water tank and the lower water tank.

[0041] As an improvement, the temperature sensor can be arranged in the water tank. Temperature sensors are respectively arranged in the upper and lower water tanks. The temperature of the water output from the water tank is calculated according to the temperatures detected in the upper and lower water tanks and the flow rates of the water output from the upper and lower water tanks.

[0042] The inlet and outlet of the upper water tank are arranged such that the flow direction of the fluid in the upper water tank is opposite to that of the fluid in the first connecting pipe 8; a vertical baffle plate 721 is arranged in the lower water tank. The vertical baffle plate includes a lower baffle plate extending upward from the lower wall of the water tank and an upper baffle plate extending downward from the partition plate. The lower baffle plate and the upper baffle plate are arranged at intervals. The vertical baffle plate is arranged between adjacent vertical pipes. The inlet and outlet of the lower water tank are arranged such that the water in the lower water tank is opposite to the flow direction of the fluid in the straight pipe; the partition plate is a heat conductor. The inlet and outlet of the upper water tank and the inlet and outlet of the lower water tank are arranged such that the flow direction of the fluid in the upper water tank is opposite to that of the fluid in the lower water tank.

[0043] In the present invention, the condensing end water tank is divided into two parts, and the two parts exchange heat with the water in different flow channels respectively, which can facilitate the configuration of different water flow directions. For example, the heat exchange fluid in each water tank is close to countercurrent heat exchange, improving the heat exchange effect. At the same time, the water in the upper and lower water tanks can also exchange heat with the fluid in the heat pipe in a countercurrent flow. The countercurrent flow in three major directions further improves the heat exchange effect.

[0044] As an improvement, as Figure 4 shown, the inlet and outlet of the upper water tank are respectively arranged on the left and right sides of the upper water tank, and the inlet and outlet of the lower water tank are respectively arranged on the right and left sides of the lower water tank. As an improvement, the flow direction of the fluid in the heat pipe in the rightmost connecting pipe 3 is from bottom to top. The above settings can form a three-countercurrent flow, thus forming the best heat exchange effect.

[0045] As an improvement, the partition is a heat conductor, and the fluids in the upper and lower flow channels can exchange heat through the partition. By setting a heat-conducting partition, the heat exchange between the fluids in the upper and lower flow channels can be realized, so that the heat of the upper and lower flow channels is complementary. Then the fluid with a higher temperature in the upper and lower flow channels transfers heat to the fluid with a lower temperature, and then the fluid with a higher temperature cools down and absorbs the heat of the heat pipe, thus realizing the maximum heat exchange amount. Through the heat conduction heat complementarity of the partition, the best heat exchange effect can be achieved as much as possible.

[0046] As an improvement, the heat conduction performance of different positions of the partition is different. From the middle of the partition to the left and right sides, the heat conduction performance gradually decreases. When the cold water in the upper and lower water tanks flows in a countercurrent manner, the inlet and outlet of the water tank are respectively arranged on the left and right sides. At this time, the temperature difference between the two is the largest and the heat exchange effect is the best. Because by increasing the heat conduction performance in the middle position, the heat exchange effect is increased, so that the overall heat exchange amount reaches equilibrium, realizing overall heat exchange equilibrium, and thus the best heat exchange effect can be achieved.

[0047] As an improvement, from the middle of the partition to the left and right sides, the amplitude of the gradual decrease in heat conduction performance becomes larger and larger. The above settings can further increase the heat exchange effect, make the overall heat exchange amount reach equilibrium, realize overall heat exchange equilibrium, and thus can further achieve the best heat exchange effect.

[0048] Although the present invention has been disclosed above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A heat exchange system with a variable heat absorption area, the system comprising a loop heat pipe, the loop heat pipe including a plurality of straight pipes arranged in parallel and first elbows and second elbows connecting the upper and lower ends of adjacent straight pipes, the first elbows and the second elbows being alternately arranged so that a series structure is formed between the straight pipes and the elbows; the loop heat pipe includes an evaporation section, the evaporation section including the second elbow and a part of the straight pipe connected to the second elbow; characterized in that, It further includes a bypass pipe provided at the upper end of the second elbow pipe. The bypass pipe is connected to an adjacent straight pipe connected to the second elbow pipe. A first valve is provided on the second elbow pipe, and a second valve is provided on the bypass pipe. When the heat exchange system is operating, at least one of the first valve and the second valve is in an open state.

2. The heat exchange system according to claim 1, wherein A bypass pipe is provided at the upper end of each second elbow pipe.

3. The heat exchange system according to claim 2, characterized in that, The loop heat pipe includes a condensation part that releases heat to the outside and is used to heat the fluid. The temperature of the heated fluid is controlled by controlling the opening and closing and the opening degree of the first valve and the second valve.

4. The heat exchange system according to claim 3, characterized in that, If it is necessary to increase the temperature of the fluid, the opening degree of the first valve is controlled to increase, and the opening degree of the second valve is decreased.

5. The heat exchange system according to claim 3, characterized in that, If it is necessary to decrease the temperature of the fluid, the opening degree of the first valve is controlled to decrease, and the opening degree of the second valve is increased.

6. The heat exchange system according to claim 3, wherein The loop heat pipe includes an upper connecting pipe connecting the upper ends of two straight pipes at the leftmost and rightmost sides. The straight pipes, elbow pipes, and upper connecting pipe form a series structure, so that the loop heat pipe fluid flows inside the series structure.

7. The heat exchange system according to claim 6, characterized in that, The condensation part includes the upper connecting pipe, the upper part of the straight pipe, and the first elbow pipe.

8. The heat exchange system according to claim 7, characterized in that, The loop heat pipe is a pulsating heat pipe.

9. The heat exchange system according to claim 7, wherein The condensation part is used to heat air.

10. The heat exchange system according to claim 7, characterized in that, The evaporation part absorbs the waste heat of the flue gas.

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