JPH06159959A - Loop-shaped heat pipe - Google Patents

Abstract

PURPOSE:To make the circulation flow rate of working fluid quickly correspond to fluctuations in heating capacity on a heat source side in an evaporator section in the case the heating capacities fluctuate in different states depending upon the location of the evaporator section. CONSTITUTION:Temperatures of an evaporation tube 20 in regions 10a, 10b and 10c of an evaporator section 10, where the heating capacities on a heat source H side fluctuate in different states to each other, are individually measured by temperature detectors 28. Flow control devices 27 mounted on small liquid feed pipes 41 are controlled by a controller 29 based on the temperature signals, so that the working liquid is circulated to the regions 10a, 10b and 10c through the small liquid feed pipes 41 at flow rates matched with the heating capacities on the heat source H side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop heat pipe in which a vapor passage and a liquid passage are separated.

[0002]

2. Description of the Related Art FIG. 2 shows a heat pipe type heat utilization device such as a geothermal utilization device for extracting heat from a specific heat source and effectively utilizing the heat. This heat pipe type heat utilization device is composed of a large loop type heat pipe 1 for extracting heat from a heat source to a predetermined position, and a heat recovery device 2 for effectively utilizing the heat extracted by the heat pipe 1.

The heat pipe 1 has an airtight pipe 20 having a large diameter, in which the vapor V of a working fluid having a large diameter flows.
And a liquid supply pipe 21 having a small diameter through which the liquid working fluid L flows. The evaporation pipe 20 is bent in the horizontal direction after the upper part of the lower inclined portion rises vertically, and is then bent downward. The inclined portion of the evaporation pipe 20 with the lower end closed is disposed in the heat source H such as the geothermal part, and the evaporation portion 10 of the heat pipe 1 is formed therein, and the upper side of the evaporation pipe 20 is formed. The condensing part 11 of the loop heat pipe 1 is formed in the descending part where the diameter is expanded.

The upper end of the liquid supply pipe 21 is the evaporation pipe 2
It is vertically descended in a state of being connected to the end portion of the condenser portion 11 on the side of 0, is bent and then extends horizontally, and then is inserted in an airtight state into the evaporating portion 10 inclined downward. The liquid supply pipe 21 in the evaporation part 10 reaches the vicinity of the lower end part of the evaporation part 10 in a state where the lower end thereof is closed. A liquid supply part 21 a including a plurality of holes for ejecting the liquid-phase working fluid L toward the inner surface of 20 is formed.

On the side of the vertically descending portion of the liquid supply pipe 21, the flow rate of the working fluid L in the liquid phase flowing in the liquid supply pipe 21 is set to the evaporation unit 1.
The liquid recirculation amount control device 12 of the heat pipe 1 for increasing / decreasing according to the heating amount of the heat source H at 0 is attached, and the horizontal part of the liquid supply pipe 21 sends the working fluid L in the liquid phase to the evaporation part 10 side. The liquid reflux pump 22 of No. 1 is attached. The liquid recirculation amount control device 12 is a working fluid L in a liquid phase.
Storage tank 23 for temporarily storing
3, a liquid level movement detector 24 for detecting rise and fall of the liquid level, a flow rate adjusting valve 25 for adjusting the flow rate of the working fluid L in the liquid phase flowing in the liquid supply pipe 21, and a liquid level movement detector 24.
And a liquid level controller 26 that controls the valve opening of the flow rate adjusting valve 25 by a signal from The liquid recirculation pump 22, the storage tank 23, and the flow rate adjusting valve 25 form a part of the closed pipe of the heat pipe 1.

Here, the heat pipe 1 is a vacuum degassed closed tube in which a fluid such as CFC or alcohol that evaporates and condenses in a target temperature range is enclosed as a working fluid, and operates by absorbing heat in the evaporating section 10. By evaporating a fluid, moving this vapor to the condensing section 11 via the evaporating pipe 20, and condensing and liquefying this vapor in the condensing section 11, the heat is released to the outside. The liquid reflux of the working fluid from the condenser 11 to the evaporator 10 is performed by a liquid reflux pump 22 via a liquid supply pipe 21 provided separately from the evaporation pipe 20. That is, the heat pipe 1 is a loop type heat pipe having an evaporation pipe 20 through which a working fluid vapor V flows and a liquid supply pipe 21 through which a liquid-phase working fluid L flows. A liquid pool 10a of the working fluid L in the liquid phase is formed below the evaporation unit 10.

The heat recovery device 2 is provided in the condensing section 11 of the heat pipe 1 and absorbs heat on the heat pipe 1 side into the heat absorbing tube 30 and hot water or steam utilizing the heat of this heat medium. The heat utilization equipment 31 for generating heat, the connecting pipes 32 and 33 connecting the heat absorption pipe 30 and the heat utilization equipment 31, and the circulation pump 34 for circulating the heat medium.

Next, the operation of this heat pipe type heat utilization device will be described. The liquid-phase working fluid L jetted to the inner surface of the evaporation pipe 20 of the evaporation unit 10 of the heat pipe 1 via the liquid supply unit 21a of the liquid supply pipe 21 is a heat source while descending along the inner surface of the evaporation pipe 20. It absorbs the heat from H and evaporates. Then, the vapor V of the working fluid rises in the evaporation pipe 20 and reaches the condensing part 11 of the heat pipe 1, where the condensing part 11 releases heat to the heat medium in the endothermic pipe 30 to condense and liquefy. . Then, the liquid-phase working fluid L is returned by the liquid recirculation pump 22 to the evaporator 10 through the liquid supply pipe 21 again. Further, the heat medium in the endothermic tube 30 of the heat recovery device 2 is moved to the heat utilization equipment 31 by the circulation pump 34 through the communication pipe 33, and is given heat to the heat utilization equipment 31 side to be cooled, It is fed again into the liquid supply pipe 21 through the communication pipe 32.

Next, a case where the heating amount of the heat source H in the evaporation section 10 of the heat pipe 1 varies will be described.
When the heating amount of the heat source H is reduced, the evaporation amount of the working fluid in the evaporation unit 10 is initially greater than the evaporation amount of the working fluid in the evaporation unit 10 via the liquid supply pipe 21.
Since there is a large amount of liquid reflux to the
The liquid-phase working fluid L is stored in 0a, and the liquid level of the storage tank 23 is lowered, but this drop of the liquid level is detected by the liquid level movement detector 24. Then, the liquid level controller 26 controls the flow rate adjusting valve 25 based on the detection signal from the liquid level movement detector 24, the flow rate of the working fluid L in the liquid phase is reduced, and the liquid recirculation amount to the evaporation unit 10 is reduced. Is immediately changed to correspond to the heating amount of the heat source H. Also,
When the heating amount of the heat source H increases, the working fluid L in the liquid phase initially stored in the liquid pool 10a below the evaporation unit 10 evaporates, and the liquid supply pipe 2 is supplied from the evaporation amount of the working fluid in the evaporation unit 10.
Since the amount of liquid recirculated to the evaporation unit via 1 decreases, the liquid level in the storage tank 23 rises, but this rise in liquid level is detected by the liquid level movement detector 24. Then, based on the detection signal from the liquid level movement detector 24, the flow rate adjusting valve 25 is controlled by the liquid recirculation controller 26, the flow rate of the working fluid L in the liquid phase is increased, and the evaporation unit 10 is increased.
The amount of liquid recirculated to is immediately changed to correspond to the amount of heat of the heat source H.

[0010]

In the above heat pipe 1, when the heating amount of the heat source H of the evaporator 10 fluctuates as a whole, the liquid reflux control device 12 adjusts the amount corresponding to the heating amount of the heat source H. Only, the liquid recirculation of the working fluid L in the liquid phase can be quickly performed on the inner surface of the evaporation pipe 20 of the evaporation unit 10 via the liquid supply pipe 21, and the heat source H side is sufficiently heated according to the heating amount of the heat source H. However, when the heating amount of the heat source H changes so as to be different along the longitudinal direction of the evaporation unit 10, the liquid recirculation amount control device 12 responds to the change of the heating amount of the heat source H by evaporating. A liquid recirculation cannot be performed on the inner surface of the evaporation pipe 20 of the portion 10, and there is a disadvantage that heat cannot be sufficiently extracted from the heat source H side according to the heating amount of the heat source H.

The present invention has been made in view of the above circumstances, and when the heating amount on the heat source side in the evaporating section fluctuates in a different state depending on the position of the evaporating section, the liquid ring flow rate can be promptly changed in response to this fluctuation. It is an object of the present invention to provide a loop heat pipe that can be adapted.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention operates from a condenser to a liquid supply pipe on the inner surface side of an evaporation portion of a lower portion of the evaporation pipe. In a loop type heat pipe in which liquid is recirculated,
The evaporation part side of the liquid supply pipe is branched into a plurality of small liquid supply pipes, and the liquid supply parts for the evaporation parts of the small liquid supply pipes are different from each other in the fluctuation state of the heating amount on the heat source side. A flow rate which is arranged in each area of the evaporation section, and which is provided with temperature detection means for detecting the temperature of the evaporation tube in the area of the evaporation section, and which adjusts the flow rate of the working fluid flowing in each of the small liquid supply tubes. It is characterized in that adjustment means is provided, and further control means is provided for controlling the flow rate adjustment means corresponding to the temperature detection means based on the temperature signals from the temperature detection means.

[0013]

The temperature of the evaporation tube of the evaporation section rises as the amount of heating on the heat source side with respect to the evaporation section increases, and decreases as the amount of heating on the heat source side decreases. Therefore, if the liquid flow rate of the working fluid is increased by increasing the temperature of the evaporation pipe in the evaporation section and the liquid flow rate of the working fluid is decreased by this decrease in temperature, the evaporation section is adjusted to the heating amount on the heat source side. The heat can be sufficiently absorbed from the lever heat source side.

Therefore, the temperature detecting means detects the temperature of the evaporation pipe in each region of the evaporation part in which the fluctuation state of the heating amount on the heat source side is different from each other, and the small liquid supply pipe is provided based on this temperature signal. By controlling the flow rate adjusting valve by the control means, the amount of heat corresponding to the amount of heat on the heat source side is actuated in the regions where the fluctuations in the amount of heat on the heat source side of the evaporator differ from each other via the small liquid supply pipes. A liquid recirculation of the fluid can be performed.

[0015]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a heat pipe type heat utilization device. This heat pipe type heat utilization device is composed of a loop type heat pipe 1 and a heat recovery device 2 and has the same basic configuration as that shown in FIG.
Is different from the above-described one in that it has a configuration capable of coping with the variation in the amount of heat of each heat source H. Note that, also in FIG. 1, the same or corresponding parts as those of the heat pipe type heat utilization device shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The heat source H has different heating state variations, for example, a first region H1, a second region H2, and a third region H3.
It is divided into In this case, "the fluctuation state of the heating amount is different from each other" means that the heating amount of the three regions independently changes, but one of the three regions is a region where the heating amount does not change. Good. Then, the number of this region of the heat source H (three in the present embodiment), the liquid supply pipe 21 of the heat pipe 1 is branched to the small liquid supply pipe 41 at the lower part of the vertical portion, and each small supply is made. A liquid reflux pump 220 is provided in the liquid pipe 41. The lower side of each of the small liquid supply pipes 41, 42, 43 is inserted into the evaporation pipe 20 of the evaporation unit 10 in a state where the lower end thereof is closed, and the heat source H is provided at the lower end side thereof.
Liquid supply parts 41a, 42a, 43 for ejecting the liquid-phase working fluid L to the inner surface of the evaporation pipe 20 of the evaporation part 10 corresponding to each region of
a.

That is, the liquid supply section 41 of the first small liquid supply pipe 41.
a is provided so as to eject the working fluid L toward the inner surface of the evaporation pipe 20 of the evaporation unit 10 (hereinafter referred to as the first evaporation unit 10a) corresponding to the first region H1 of the heat source H, and similarly, the second small pay amount. The liquid supply part 42a of the liquid pipe 42 is formed toward the inner surface of the evaporation pipe 20 of the evaporation part 10 (hereinafter referred to as the second evaporation part 10b) corresponding to the second region H2 of the heat source H, and the third small liquid supply pipe 4 is formed.
The liquid supply part 43a of No. 3 is the evaporation pipe 20 of the evaporation part 10 (hereinafter referred to as the third evaporation part 10c) corresponding to the third region H3 of the heat source H.
It is provided toward the inner surface.

Further, in the heat pipe 1, a liquid ring of a working fluid to each part of the evaporation part 10 via each small liquid supply pipe 41 is provided in response to the fluctuation of the heating amount of each region on the heat source H side. A region-by-region liquid recirculation amount control device 13 for controlling the flow rate is provided.

The region-by-region liquid recirculation amount control device 13 is provided with a flow rate adjusting valve 27 as a flow rate adjusting means for the liquid-phase working fluid L provided on the downstream side of the liquid recirculation pump 44 of each small liquid supply pipe 41.
A temperature detector 28 is provided on the outer surface of each evaporation pipe 20 of the first, second, and third evaporation units 10a, 10b, and 10c, and serves as a temperature detecting means for the evaporation pipe 20, and is provided in the first evaporation unit 10a. Based on the temperature signal from the temperature detector 28, the first
The flow rate adjusting valve 27 in the small liquid supply pipe 41a is controlled, and the flow rate adjusting valve 27 in the second small liquid supply pipe 21b is controlled based on the temperature signal from the temperature detector 28 provided in the second evaporation unit 10b. Then, the liquid recirculation controller 2 as the control means for controlling the flow rate adjusting valve 27 in the third small liquid supply pipe 43 based on the temperature signal from the temperature detector 28 provided in the third evaporator 10c.
It is composed of 9 and 9. The flow rate adjusting valve 27 and the liquid recirculation pump 44 form a part of the closed pipe of the heat pipe.

Here, the heating amount of the heat source H increases when the temperature of the heat source H rises and decreases when the temperature of the heat source H falls. Further, the temperature of the outer surface of the evaporation pipe of the evaporator 10 is almost the same as the temperature of the heat source H if there is no liquid-phase working fluid L on the inner surface side, but there is the liquid-phase working fluid L on the inner surface side. When the heat is absorbed from the heat source H side, the temperature falls below the temperature of the heat source H. Unless the temperature of the heat source H rises and falls extremely, if the amount of heat from the heat source H and the amount of heat absorbed by the evaporation of the liquid-phase working fluid L are equal, the temperature of the outer surface of the evaporation pipe 20 of the evaporation unit 10 is substantially constant. (Hereinafter referred to as reference temperature).

Therefore, for example, when the temperature of the heat source H rises and the outer surface temperature of the evaporation pipe 20 of the evaporation section 10 rises above the reference temperature, this is lowered to the reference temperature and the suction amount commensurate with the heating amount from the heat source H is lowered. In order to obtain the amount of heat, the amount of the liquid-phase working fluid L supplied to the inner surface side of the evaporation pipe 20 may be increased so that more heat is absorbed from the heat source H side. On the contrary, when the temperature of the heat source H decreases and the outer surface temperature of the evaporation pipe 20 of the evaporation unit 10 decreases below the reference temperature, the temperature is raised to the reference temperature to obtain the heat absorption amount corresponding to the heat amount from the heat source H. In order to obtain it, the amount of the liquid-phase working fluid L supplied to the inner surface side of the evaporation pipe 20 may be reduced to eliminate the excess liquid-phase working fluid L supplied to the evaporation unit 10. That is,
When the temperature fluctuates in each region of the heat source H and the heating amount becomes different, the supply amount of the working fluid L in the liquid phase to each part of the evaporation unit 10 is increased or decreased so that the outer surface temperature of each evaporation pipe 20 becomes the reference temperature. Should be

The heat pipe 1 of this heat pipe type heat utilization device is not provided with the liquid recirculation amount control device 12, but the storage tank 23 and the flow rate adjusting valve 25 are provided at the descending portion of the liquid supply pipe 21. Has been.

Next, the operation of this heat pipe type heat utilization device will be described in relation to the liquid recirculation amount control device 13 for each region of the heat pipe 1. When the temperature of the heat source H is constant and the amount of heating does not change, the opening degree of the flow rate adjusting valve 27 becomes constant,
The first, second, and third small liquid supply pipes 41, 42, and 43 of the evaporation unit 10 are connected via the liquid supply units 41a, 42a, and 43a.
A fixed amount of the working fluid L in a liquid phase is jetted to the inner surfaces of the respective evaporation pipes 20 of the second and third evaporation parts 10a, 10b, 10c, and the first, second, and third evaporation parts 10a, 10b, 10c are respectively discharged. The outer surface temperature of the evaporation pipe 20 is maintained at the reference temperature. Then, the working fluid that has absorbed and evaporated heat from the heat source H in the evaporation unit 10 moves to the condensation unit 11, where it releases heat to the heat medium side of the heat recovery device 2 to be condensed and liquefied. Then, the liquid-phase working fluid L is temporarily stored in the storage tank 23 and then supplied to the liquid recirculation pumps 44 of the small liquid supply pipes 41, 42, 43 through the fully opened flow rate adjusting valve 25 and the like. Then, it is pressurized by the liquid recirculation pump 44 and sent to the flow rate adjusting valve 27 side.

Next, for example, if the temperature of the first region H1 of the heat source H rises and the heating amount for the first evaporation portion 10a increases, the outer surface temperature of the evaporation pipe 20 of the first evaporation portion 10a becomes the reference temperature. Since the temperature further rises, the liquid recirculation controller 29 operates on the basis of the signal from the temperature detector 28 so that the first small liquid supply pipe 4
The valve opening of the flow control valve 27 of No. 1 is increased. For this reason,
The amount of the liquid-phase working fluid L ejected from the liquid supply part 41a of the first small liquid supply pipe 41 increases, and the amount of heat absorbed from the first region H1 of the heat source H in the first evaporation part 10a increases. As a result, the outer surface temperature of the evaporation pipe 20 of the first evaporation unit 10a decreases and approaches the reference temperature. When this temperature reaches the vicinity of the reference temperature, the liquid recirculation controller 29 determines the first
The opening degree of the flow rate adjusting valve 27 of the small liquid supply pipe 41 is maintained in that state.

If, for example, the temperature of the third region H3 of the heat source H falls and the heating amount for the third evaporating section 10c decreases, the outer surface temperature of the evaporating pipe 20 of the third evaporating section 10c becomes higher than the reference temperature. Since it descends, the liquid recirculation controller 29 causes the third small liquid supply pipe 4 based on the signal from the temperature detector 28.
The valve opening of the flow rate adjusting valve 27 of No. 3 is reduced. For this reason,
The amount of the liquid-phase working fluid L ejected from the liquid supply part 43a of the third small liquid supply pipe 43 decreases, and the amount of the excess liquid-phase working fluid L supplied to the third evaporation part 10a decreases. . As a result, the outer surface temperature of the evaporation pipe 20 of the third evaporation unit 10a rises and approaches the reference temperature. When this temperature reaches the vicinity of the reference temperature, the liquid recirculation controller 29 keeps the valve opening degree of the flow rate adjusting valve 27 of the third small liquid supply pipe 43 in that state. In this case, the excessively supplied liquid-phase working fluid L is stored in the liquid pool 40 below the evaporator 10.

On the other hand, the flow rate adjusting valve 27 of each of the small liquid supply pipes 41, 42, 43 is adjusted in accordance with the variation of the heating amount in each area of the heat source H.
Even if the opening degree of the heat pipe type heat utilization device is operated rapidly, it takes time to control the flow rate adjusting valve 27 by the liquid recirculation controller 29. The working fluid L in the liquid phase is accumulated in the pool 40, and the liquid level of the storage tank 23 is lowered. For this reason, if the liquid level of the storage tank 23 falls below a predetermined position, the liquid recirculation amount control device for each area 1
The control by 3 is temporarily interrupted, and the flow rate adjusting valve 25 is closed gradually, for example, while the valve opening degree of the flow rate adjusting valve 27 is maintained, and the liquid level of the storage tank 23 is raised. Then, when the liquid level of the storage tank 23 rises to a predetermined position, the flow rate adjusting valve 25 is fully opened again, and control by the region-based liquid recirculation amount control device 13 is started.

As described above, the temperature of the outer surface of the evaporation pipe 20 of the evaporation unit 10 is measured corresponding to each area of the heat source H, and the variation of the heating amount of the heat source H in each area is detected by this temperature to detect the temperature of the heat source H. Evaporation unit 10 for each area corresponding to the heating amount
Since the liquid-phase working fluid L is supplied to each part of the above, even if the heating amount of the heat source H side of the evaporator 10 fluctuates independently depending on the region, the working fluid to the evaporator 10 is adjusted according to this fluctuation. The liquid recirculation is generated, and the heat on the heat source H side can be absorbed to the maximum by the heat pipe 1.

The liquid recirculation pump 44 is, for example, a pump capable of controlling the rotation speed, and the liquid recirculation pump 44 is provided with a function as a flow rate adjusting means so that the liquid recirculation controller 29 controls the liquid recirculation pump 44. If so, the flow rate adjusting valve 27 becomes unnecessary. That is, the evaporation unit 1
If the temperature of the outer surface of the evaporation tube 20 of 0 increases, the rotation speed of the liquid reflux pump 44 is increased to increase the supply amount of the working fluid L in the liquid phase to the evaporation unit 10. If the temperature decreases, the liquid reflux pump 44 It is sufficient to reduce the rotation speed of No. 2 to reduce the supply amount of the liquid-phase working fluid L to the evaporation unit 10. When the liquid circulation of the working fluid to the evaporator 10 of the heat pipe 1 is sufficiently performed by the action of gravity, the liquid reflux pump 44
Is unnecessary. Further, if mutual interference between the flow rate adjusting valves 27 can be prevented, one liquid recirculation pump 44 having a capacity of three units may be provided in common downstream of the flow rate adjusting valve 25.

Although the temperature detector 28 is provided on the outer surface of the heat pipe 1 in the above embodiment, the temperature detector 28 may be provided inside the heat pipe 1.

[0030]

As is apparent from the above description, according to the present invention, even if the amount of heat on the heat source side in the evaporating part of the heat pipe fluctuates so as to vary depending on the position of the evaporating part, this fluctuation is detected by the temperature detector. The flow rate adjusting means of each small liquid supply pipe is controlled by the control means, and the liquid recirculation flow is respectively applied to the regions where the fluctuation state of the heating amount on the heat source side of the evaporation section is different via the plurality of small liquid supply pipes. Therefore, it is possible to quickly respond to the liquid ring flow rate with respect to the fluctuation of the heating amount on the heat source side,
The amount of heat corresponding to the amount of heating can be taken out.

[Brief description of drawings]

FIG. 1 is a sectional view of a heat pipe type heat utilization device showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional heat pipe type heat utilization device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 loop type heat pipe 10 evaporation part 10a 1st evaporation part (area where heating amount fluctuation state differs) 10b 2nd evaporation part (area where heating amount fluctuation state differs) 10c 3rd evaporation part (heating amount fluctuation state changes) 11) Condensing part 20 Evaporating pipe 21 Liquid supply pipe 27 Flow rate adjusting valve (flow rate adjusting means) 28 Temperature detector (temperature detecting means) 29 Liquid recirculation controller (control means) 41 Small liquid supply pipe 41a Liquid supply part 42 Small Liquid supply pipe 42a Liquid supply part 43 Small liquid supply pipe 43a Liquid supply part H Heat source

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masao Shiraishi 1-2-2 Namiki, Tsukuba-shi, Ibaraki Institute of Mechanical Engineering, Industrial Technology Institute (72) Inventor Takashi Obuchi 1-5-1 Kiba, Koto-ku, Tokyo Stocks Company Fujikura (72) Inventor Masataka Mochizuki 1-5-1, Kiba, Koto-ku, Tokyo Within Fujikura Co., Ltd. (72) Inventor Fumiaki Aoyama 1-5-1, Kiba, Koto-ku, Tokyo Within Fujikura Co., Ltd. (72) Inventor Yoshinori Kanai, 1-5-1 Kiba, Koto-ku, Tokyo, Fujikura Stock Company

Claims (1)

[Claims] 1. A loop-type heat pipe in which a working fluid is recirculated from a condenser to a liquid supply pipe through a liquid supply pipe on the inner surface of the evaporation pipe provided at a lower portion of the evaporation pipe. The evaporating section side of each of the evaporating sections is divided into a plurality of small liquid supply pipes, and the liquid supplying section for each evaporating section of each of the small liquid supply pipes is connected to each of the evaporating sections in which the fluctuation state of the heating amount on the heat source side is different from each other. Each of the regions is provided with a temperature detecting means for detecting the temperature of the evaporation pipe in the region of the evaporation portion, and a flow rate adjusting device for adjusting the flow rate of the working fluid flowing in each of the small liquid supply pipes is provided. A loop heat pipe, further comprising control means for controlling the flow rate adjusting means corresponding to the temperature detecting means based on a temperature signal from each of the temperature detecting means.