Loop heat pipe solar heat collection system capable of emptying low-temperature water

A technology of solar heat collection and loop heat pipe, which is applied in the field of solar energy, can solve the problems of inability to realize remote control and low degree of intelligence, and achieve the effects of increasing vibration range, improving heat collection effect, and optimizing heating efficiency

Inactive Publication Date: 2022-01-25

SHANDONG UNIV

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AI-Extracted Technical Summary

Problems solved by technology

[0009] In the previous application, the descaling method of the heat collector was studi...

Method used

The present invention is by improving prior art, and upper tube and radiating tube group are respectively set to two of left and right distributions, makes the radiating tube group of left and right sides distribution all can carry out vibrating heat exchanging descaling, thereby expands exothermic tube group The thermal vibration area can make the vibration more uniform, the heat transfer effect is more uniform, the heat transfer area is increased, and the heat transfer and descaling effects are enhanced.

[0056] Preferably, the central controller controls the opening and closing of the valves 52, 54 through the lowest value of the temperature of the fluid measured by a plurality of temperature sensors 55. By taking the lowest value, further accuracy of the data is enabled.

[0063] Preferably, the valve 50 is arranged on the outlet pipe of the heat collector near the heat collector. In this way, basically no cold fluid will be stored on the outlet pipeline 47 to ensure the heat storage effect.

[0073] Through the above measures, the temperature of the fluid is detected through the bypass pipeline, which further improves the effect of heat storage and improves the intelligent control of heat storage.

[0099] The collector tube box 8 is filled with a phase-change fluid, preferably a vapor-liquid phase-change fluid. The fluid is heated and evaporated in the heat collecting tube box 8, and flows along the heat release tube bundle to the upper left tube 21 and the upper right tube 22. After being heated, the fluid will expand in volume to form steam, and the volume of steam is much larger than that of water, thus forming The steam will flow rapidly and impulsively in the coil. Because of the volume expansion and the flow of steam, the free end of the heat release tube can be induced to vibrate, and the free end of the heat exchange tube transmits the vibration to the heat exchange fluid in the box 9 during the vibration process, and the fluids will also disturb each other. As a result, the surrounding heat exchange fluid forms a turbulent flow and destroys the boundary layer, thereby achieving the purpose of enhancing heat transfer. After the fluid condenses and releases heat in the left and right upper tubes, it returns to the heat collecting tube box through the return tube.

[0104] In the inventor's previous application, a periodic heating method was proposed to continuously promote the vibration of the coil, thereby improving the heating efficiency and descaling effect. However, if the vibration of the tube bundle is adjusted through fixed periodic changes, there will be hysteresis and the period will appear too long or too short. Therefore, the present invention improves the previous application, intelligently controls the vibration, so that the internal fluid can realize frequent vibration, thereby achieving a good descaling effect.

[0110] By judging the steady state of the fluid according to the pressure difference or the accumulation of pressure difference changes, the result is mor...

Abstract

The invention provides a loop heat pipe solar heat collection system capable of emptying low-temperature water. If the temperature, detected by a central controller, of an inlet pipe of a heat accumulator is lower than the temperature of a heat storage material of the heat accumulator, a central controller automatically closes an outlet pipe valve, an exhaust port valve is opened, meanwhile, a power device is started to operate, fluid which does not meet the temperature requirement on a pipeline of the heat accumulator is discharged through an exhaust port of a bypass pipeline, and after the power device runs for a certain time, the power device and the exhaust port valve are closed, the outlet pipe valve is opened, and a first valve is closed; and when the detected temperature of the fluid in the heat collection device exceeds a certain value of the temperature of the heat storage material, the first valve is opened, and a second valve is closed, so that the fluid enters the heat accumulator for heat storage. Low-temperature water which does not meet the heat storage requirement is automatically emptied according to the detected temperature, and the heat storage requirement is met.

Application Domain

Solar heating energySolar heat collector controllers +7

Technology Topic

Collection systemProcess engineering +8

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Examples

Experimental program(3)

Example Embodiment

[0049] 1. Embodiment 1

[0050] As an improvement, the central controller automatically controls the opening and closing of the valves 52 and 54 according to the detected temperature of the heat storage material and the temperature of the fluid entering the heat storage.

[0051] Preferably, valve 54 is open and valve 52 is closed during normal operation.

[0052] If the temperature of the heat storage material is higher than the temperature of the fluid entering the heat accumulator, the central controller automatically controls the valve 54 to close and the valve 52 to open simultaneously. Ensure that the fluid does not enter the heat accumulator, because if the fluid enters the heat accumulator 46 at this time, it will not only fail to achieve the effect of heat storage, but will transfer the heat in the heat storage material to the fluid, thereby reducing the heat storage effect. Energy can thus be saved by this measure.

[0053] If the temperature of the fluid detected by the bypass pipeline temperature sensor 51 is higher than the temperature of the heat storage material, the central controller automatically controls the opening of the valve 54 and the closing of the valve 52 to ensure that the fluid can enter the heat accumulator 46 for heat storage.

[0054] As a preference, multiple temperature sensors 55 are arranged on the inlet pipe of the heat accumulator pipeline, and the temperature of the fluid on the inlet pipe of the heat accumulator pipeline is measured by the multiple temperature sensors 55 .

[0055] Preferably, the central controller controls the opening and closing of the valves 52 and 54 through the average value of the temperature of the fluid measured by a plurality of temperature sensors 55 .

[0056] Preferably, the central controller controls the opening and closing of the valves 52 and 54 through the lowest value of the temperature of the fluid measured by a plurality of temperature sensors 55 . By taking the lowest value, further accuracy of the data is enabled.

[0057] Preferably, the at least one temperature sensor is arranged at a position where the heat accumulator inlet pipe is close to the heat accumulator 46 .

[0058] Preferably, the connection point of the bypass pipeline and the heat accumulator pipeline is close to the inlet of the heat accumulator. This avoids storing too much cold fluid in the accumulator line from the last time valve 54 was closed.

Example Embodiment

[0059] 2. Embodiment 2

[0060] As an improvement, a power device, such as a pump or fan, is provided on the pipeline of the heat accumulator to drive the fluid; a discharge port is provided on the bypass pipeline to discharge the fluid, and a valve is provided at the discharge port; the central control The device automatically controls the opening and closing of the valves 50, 52, 54 according to the detected temperature of the inlet pipe of the heat accumulator 46, the temperature in the heat collector and the temperature of the bypass pipeline.

[0061] If the temperature of the inlet pipe of the heat accumulator detected by the central controller is lower than the temperature of the heat storage material of the heat accumulator, the central controller automatically closes the valve 50, opens the outlet valve, and starts the power plant to run at the same time. The fluid on the pipeline that does not meet the temperature requirements is discharged through the outlet of the bypass pipeline. After the power unit has been running for a certain period of time, close the valves of the power unit and the outlet, open the valve 50, and close the valve 54; When the temperature of the fluid exceeds a certain value of the temperature of the heat storage material, preferably more than 10 degrees Celsius, the valve 54 is opened and the valve 52 is closed, so that the fluid enters the heat accumulator for heat storage.

[0062] Through the above measures, the heat storage of the heat accumulator can be intelligently controlled.

[0063] Preferably, the valve 50 is arranged on the outlet pipe of the heat collection device at a position close to the heat collection device. In this way, basically no cold fluid will be stored on the outlet pipeline 47 to ensure the heat storage effect.

[0064] Preferably, a plurality of temperature sensors are arranged in the heat collecting device, and the temperature of the fluid is measured by the plurality of temperature sensors.

[0065] Preferably, the central controller controls the opening and closing of the valves 50, 52, 54 through the average value of the temperature of the fluid measured by a plurality of temperature sensors.

[0066] Preferably, the central controller controls the opening and closing of the valves 50, 52, 54 through the lowest value of the temperature of the fluid measured by a plurality of temperature sensors. By adopting the lowest value, it can be ensured that the temperature of the fluid at all positions in the heat collecting device can reach the usable temperature.

[0067] Preferably, the at least one temperature sensor is arranged in the heat collecting device near the inlet pipe 48 of the heat collecting device.

[0068] Preferably, the at least one temperature sensor is arranged in the heat collecting device near the outlet pipe 47 of the heat collecting device.

[0069] Preferably, the connection point of the bypass pipeline and the heat accumulator pipeline is close to the inlet of the heat accumulator. This avoids storing too much cold fluid in the accumulator line from the last time valve 54 was closed.

Example Embodiment

[0070] 3. Embodiment three

[0071] Embodiment 3 is a further improvement of Embodiment 2.

[0072] If the temperature of the inlet pipe of the heat accumulator detected by the central controller is lower than the temperature of the heat storage material of the heat accumulator, the central controller automatically closes the valve 50, opens the outlet valve, and starts the power plant to run at the same time. The fluid on the pipeline that does not meet the temperature requirements is discharged through the outlet of the bypass pipeline. After the power unit runs for a certain period of time, close the valve at the outlet of the power unit; when the temperature of the fluid in the heat collector exceeds a certain value of the temperature of the heat storage material, Preferably above 5 degrees Celsius, valve 50 is opened, valve 54 is closed, and the fluid flows through the bypass pipeline. The pipeline valve 52 is closed, and the heat accumulator pipeline valve 54 is opened, so that the fluid enters the heat accumulator for heat storage.

[0073] Through the above measures, the temperature of the fluid is detected through the bypass pipeline, which further improves the effect of heat storage and improves the intelligent control of heat storage.

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Description & Claims & Application Information

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InactiveUS7286511B2reduce consumptionreduce bandwidth waste

Owner:KONINKLIJKE PHILIPS ELECTRONICS NV

Classification and recommendation of technical efficacy words

Improve heat release capacity
Improve heat collection effect

Accumulative temperature difference controlled loop heat pipe solar system

ActiveCN112797642AImprove heat collection effectImprove heat release capacity

Owner:SHANDONG UNIV

Loop heat pipe solar heat collection system capable of emptying low-temperature water

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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