JP2002122392A - Loop heat exchange heat transporting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loop heat exchange heat transporting equipment capable of transporting a large quantity of heat over a long distance for a long period with maintenance-free of a simple structure without necessity of external power. SOLUTION: The loop heat exchange heat transporting equipment comprises a sensible heat radiating heat exchanger 10 provided at a solution feeding pipe 5 passage of a series of circulating solution transport pipe A or B for connecting a solution feeding pipe 5 provided at a solution outlet 4 of a heat exchange circulating solution storage container 1 for containing a heat exchange circulating solution 2 raised to a high temperature, a pipe 6 in the container passing through the container 1 or a container surrounding pipe 9 surrounding the outer circumference of the container 1 and a gas/liquid two-phase fluid feeding pipe 8 provided at a gas/liquid fluid inlet 7 of the container 1. The equipment further comprises a heating heat exchanger 11 provided at the pipe 8 passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange heat transport device for transporting heat from a high heat source to a low heat source.

[0002]

2. Description of the Related Art A heat exchanger depends on its use and the form of heat transfer.
It is also called a heater, preheater, evaporator, cooler, condenser, etc. Many types of heat exchangers are widely used for practical use, such as shell-and-tube heat exchangers and fin-and-tube heat exchangers, in which the heat exchange medium is isolated by solid walls and does not come into direct contact with the surface heat. It is also called an exchanger or a heat exchanger, and it comes into direct contact with a heat medium that is easy to separate after contact like liquid and gas or two kinds of liquids with different boiling points, like an air-conditioning cooling tower that contacts water and air. It is also called a contact heat exchanger that exchanges heat, and these heat exchangers also have a wide variety of structures such as coil type, multiple tube type, and water injection type. Heat transport equipment using these heat exchangers has also been developed.

As one example, FIG. 4 introduced in “Transactions of the Japan Society of Mechanical Engineers, 61-591, B (1995)”
There is an infiltration heat pipe type heat exchange heat transport equipment as shown in Figure. The heat exchange circulating solution 22 heated by the gas-liquid separator combined heat exchanger 21 is a high temperature and high concentration heat exchange circulating solution 23.
And steam 24. The circulating liquid for heat exchange 23 is sent to the membrane module 27 while being guided by the circulating liquid transport pipe 25 (in the direction of the arrow) while cooling while releasing the sensible heat held by the sensible heat release heat exchanger 26. . One steam 24
While being guided by the vapor transport pipe 28, it is cooled while releasing latent heat and sensible heat retained in the condenser 29 during transportation, and is sent to the membrane module 27 as a condensate, that is, a solvent 30. The solvent 30 fed into the membrane module 27 is a high-concentration heat exchange circulating fluid 2 that passes through the inside of the membrane module 27 through a solution passage 32 partitioned by a semipermeable membrane 31.
3 flows into the heat exchange circulating fluid 23 while decreasing the concentration through the semi-permeable membrane 31 by the osmotic action due to the concentration difference from 3, and becomes the low-concentration heat exchange circulating solution 22 to be used together with the gas-liquid separator. Return to the heat exchanger 21 and circulate again in the equipment. This apparatus is used to convert the phase change between gas and liquid and the circulating fluid for heat exchange 23 separated by the semi-permeable membrane 31 and the solvent 3
Since it is a heat exchange heat transporting device utilizing osmosis caused by a concentration difference between 0 and 0, the heat exchange circulating solution 22
Is dissolved in a solvent 30 such as distilled water that causes a gas-liquid phase change and a solvent 30 such as sodium chloride, potassium chloride, sucrose, polyethylene glycol, etc., and does not generate azeotrope and permeates the semipermeable membrane 31 A mixture of solids and liquids that cannot be used is used. The osmotic heat pipe type heat exchange heat transport device having such a structure is provided with a heat exchange circulating fluid 23.
The heat is transferred from the high heat source to the lower heat source by utilizing the phase change separated into the solvent 30 and has the advantage that there is no need to use external power.

[0004] As another example, for example, "Proc.
AIAA 27th Thermophysics
Conf. , AIAA 92-2910 (198
8)) and CPL (Cap) as shown in FIG.
(illary Pumped Loop) There is a heat pipe type heat exchange heat transport equipment. This heat exchange heat transport equipment
A circulating solution for heat exchange 35 flowing through a heating heat exchanger 34 containing a porous substance 33 such as sintered metal is circulated as a vapor 36 while being heated, and circulates on the way of a solution transport loop pipe 37 to be guided. The condenser 38 is cooled while releasing latent heat and sensible heat by the heat exchange function of the condenser 38 provided.
The structure returns to the low-temperature heat exchange circulating solution 35 again. Further, the circulating solution for heat exchange 35 used in this equipment is used.
In addition to the complex liquid obtained by mixing azeotropic distilled water and ethanol, a liquid that causes a gas-liquid phase change such as distilled water, alcohol, and liquid metal is used. Such a CPL heat pipe type heat exchange heat transport device employs a heat exchange heat transfer device by a capillary action generated at a gas-liquid interface between a heat exchange circulating solution 35 passing through a porous substance 33 of a heat exchanger 34 and a vapor 36 thereof. For circulating the circulating solution 35 for heat exchange from the high heat source to the low heat source by utilizing the gas-liquid phase change of the circulating solution 35 for heat exchange in the same manner as the above-described osmotic heat pipe type heat exchange heat transport equipment. It has the advantage that it does not require the use of external power, as it transports heat to the heat source.

[0005]

The above two heat exchange heat transport devices described in the literature transport heat exchange solutions and their vapors as compared to heat transport devices using a heat exchanger before that. Has the advantage of being able to operate at low operating costs because no external power is used, but in the case of osmotic heat pipe type heat exchange heat transport equipment, an organic membrane such as cellulose acetate membrane is used for the semipermeable membrane of the membrane module. , Consolidation of organic film (shrinkage of organic film due to difference in pressure acting on both surfaces of organic film in long-term use) and deterioration of semi-permeability due to destruction of organic film by microorganisms (solute leakage) As a result, it was difficult to transport heat for a long period of time due to the reduced solvent permeation performance. In addition, the CPL heat pipe type heat exchange heat transport equipment utilizes the capillary action, which has a relatively small flow capacity of the circulating solution for heat exchange, so that the amount of heat transport is small and its use is limited to a relatively small heat transport height. Problem.

Accordingly, the present invention solves the above-mentioned problems, and has a simple structure which does not require external power, is maintenance-free, and can transfer a large amount of heat over a long distance. It is intended to provide transportation equipment.

[0007]

SUMMARY OF THE INVENTION The present invention has achieved the above-mentioned object, and the gist of the present invention is to provide a heat transfer circulating solution storage container 1 for storing a heat exchange circulating solution 2 heated to a high temperature. A solution delivery pipe 5 provided at the outlet 4 and a vessel pipe 6 passing through the heat exchange circulating solution storage vessel 1 or a vessel surrounding pipe 9 circulating around the outer circumference of the heat exchange circulating solution storage vessel 1; The sensible heat release heat exchanger 10 is connected to a series of circulating solution transport pipes A or B, which are connected to a gas-liquid two-phase fluid inlet pipe 8 provided at the gas-liquid two-phase fluid inlet 7. This is a loop heat exchange heat transport device characterized by being provided with a heating heat exchanger 11 in eight gas-liquid two-phase fluid inlet pipes.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a heat exchange circulating solution storage container. The heat-exchange circulating solution storage container 1 is a container for containing a heat-exchange circulating solution 2 and a vapor 3 in which the solution 2 changes its phase and retains latent heat. The heat-exchange circulating solution 2 contains distilled water, A fluid that causes a gas-liquid phase change, such as a single component such as alcohol or liquid metal, or a composite component obtained by mixing azeotropic distilled water and ethanol, is used and contained. Further, a solution delivery pipe 5 is provided at the solution sending / outlet port 4 of the heat exchange circulating solution storage container 1, and an in-container pipe 6 which passes through (or penetrates) the heat exchange circulating solution storage container 1 is provided. A gas-liquid two-phase fluid supply inlet 7 is provided with a gas-liquid two-phase fluid supply pipe 8 and is provided on a circulating solution transport pipe A connecting these pipes in a series. That is, the heat exchange circulating solution storage container 1
The stored circulating solution for heat exchange 2 exits the container 1, a series of circulating solution transport pipes A returning from the gas-liquid two-phase fluid inlet pipe 8 to the container 1 via the solution delivery pipe 5, the pipe 6 in the vessel, and the like. Is provided. FIG. 2 shows another embodiment of the present invention, in which a circulation pipe is provided in which a vessel surrounding pipe 9 circulating around the outer circumference of the heat exchange circulating solution storage vessel 1 is provided instead of the vessel pipe 6 of FIG. The case where the solution transport pipe B is provided is shown. That is, as shown in FIG. 2, the heat-exchange circulating solution 2 sent out of the heat-exchange circulating solution storage container 1 is sent to the gas-liquid two-phase fluid via the solution sending pipe 5 and the container surrounding pipe 9. A series of circulating solution transport pipes B returning from the inlet pipe 8 to the vessel 1 may be provided. Reference numeral 10 denotes a sensible heat release heat exchanger for releasing the sensible heat of the heat exchange circulating solution 2 flowing through the flow path of the solution delivery pipe 5 forming the circulating solution transport pipe A or B while retaining high-temperature heat. Heat exchange and cooling to a low temperature. 11 is a heating heat exchanger. The heating heat exchanger 11 transfers the low temperature circulating solution 2 for heat exchange through the sensible heat releasing heat exchanger 10 to the gas-liquid two-phase fluid inlet pipe 8 forming the circulating solution transport pipe A or B. In this way, the gas is heated to a high temperature in the gas-liquid two-phase region.

In the present invention configured as described above, heat is transported as follows. In the loop heat exchange heat transport equipment as shown in FIG. 1, a heat exchange circulating solution 2 having a high temperature and circulating while flowing through the equipment passes through a solution delivery pipe 5 of a circulating solution transport pipe A. At this time, after the sensible heat is released by the sensible heat release heat exchanger 10 and the heat is exchanged and cooled to a low temperature, the pipe in the vessel penetrates the heat exchange circulating solution 2 accommodated in the heat exchange circulation solution accommodating vessel 1. 5, is heated by the high-temperature steam 3 that has undergone a phase change from the circulating solution 2 for heat exchange and rises in temperature, and is further provided with a heating heat provided in a passageway flowing through the gas-liquid two-phase fluid inlet pipe 8. The temperature is further raised to a high temperature by the exchanger 11, and the heat is returned to the heat exchange circulating solution storage container 1 while boiling to generate the vapor bubbles 12. The circulating solution for heat exchange 2 returned to the heat exchange circulating solution storage container 1 is cooled again and preheated while flowing through the circulating solution transport pipe A, and then rises to a high boiling temperature. That is, in the present invention, the phase change of the circulating solution 2 for heat exchange, the inside of the gas-liquid two-phase fluid inlet pipe 8 from the heating heat exchanger 11 to the gas-liquid two-phase fluid inlet 7 and the pipe 6 in the container and the heat exchange Utilizing the density difference of the heat exchange circulating solution 2 between the circulating solution storage container 1 and the lower gas-liquid two-phase fluid inlet pipe 8 (that is, buoyancy caused by this density difference), the heat exchange circulating solution 2 is used. Circulates through the equipment and repeats this circulation while heating the heat exchanger 11
Is transferred from the sensible heat release heat exchanger 10 to another device that requires heat.

In the loop heat exchange heat transport device as shown in FIG. 2, the heat exchange circulating solution 2 passing from the heat exchange circulating solution storage container 1 through the solution delivery pipe 5 of the circulating solution transport pipe B passes through the circulation device. Sensible heat release heat exchanger 10
After passing through the heat-exchange circulating solution storage container 1, the heat-exchange circulating solution storage container 1 is cooled down to a low temperature by heat exchange, and then flows through a container surrounding pipe 9 circulating around the outer periphery of the heat exchange circulating solution storage container 1. After being preheated by the heat dissipated from the heat exchanger 11 of the gas-liquid two-phase fluid inlet pipe 8, the temperature is further raised to a high temperature and the mixture is boiled. Return to storage container 1. The circulating solution for heat exchange 2 sent out from the heat exchange circulating solution storage container 1 is repeatedly cooled, preheated, and repeatedly heated to a high boiling temperature.

[0011]

As described above, the loop heat exchange heat transport equipment of the present invention has a remarkable heat transport ability as described below. FIG. 3 shows the experimental results when the heat transport amount was measured using the loop heat exchange heat transport equipment of the present invention shown in FIG.
The experimental conditions at this time were as follows: the transfer height of the circulating solution transport loop between the heat exchange circulating solution storage container 1 and the sensible heat release heat exchanger 10 was 3.25 m, and the space between them was connected by a pipe having an inner diameter of 8 mm. In addition, distilled water is used for the circulating solution 2 for heat exchange,
The temperature of the circulating solution 2 for heat exchange at the outlet of the sensible heat release heat exchanger 10 was adjusted to 40 ° C. The figure shows the relationship between the heat transport amount (heat release amount in the sensible heat release heat exchanger 10: W) and the heat load (heat transfer amount from the heating heat exchanger 11 to the heat exchange circulating solution 2: W) obtained by this experiment. Shown by 3. The relationship between the amount of heat transport and the heat load is related within an error of ± 10%.
Could be transported by heat. In this experiment, a heat transfer experiment was performed up to a heat load of 2000 W. However, from the principle of circulation of the circulating solution 2 for heat exchange described above, the gas-liquid two-phase flow inlet 7 and the installation position of the heating heat exchanger 11 were used. By increasing the distance between the pipes and increasing the inner diameter of each pipe, the circulating flow rate of the circulating solution for heat exchange 2 is increased. Therefore, it is not possible to carry out heat transfer at a larger heat load at a larger heat transfer height. It is possible, and the present invention has a large heat transport capacity.

From the above results, the conventional heat exchange heat transport equipment has any of the problems that the heat transport height is small, the heat transport amount is small, or the heat transport cannot be performed for a long time. The present invention has a heat transport height of several meters or more and a heat transport capacity of several thousand watts or more, and is capable of long-term heat transport, and is ready for practical use. An example of use is the use of the present invention to transport and store heat from a road surface, which has become hot due to the solar heat that falls on the road in summer, to a low-temperature tropics located a dozen meters below the ground, and that snow falls on the road surface in winter. By transporting the heat stored in the tropics to the road surface using a conventionally proposed thermosiphon, snowmelt can be prevented, preventing road interruptions and slipping accidents due to snowfall. In addition, the heating heat exchanger 11 of the present invention is installed on the side wall or inside of the building, and the sensible heat releasing heat exchanger 10 is installed in underground soil, domestic wastewater, groundwater or river.
By installing, the heat that flows into the interior from around the building in summer can be exhausted, and the cooling cost can be reduced. Furthermore, by using the present invention instead of the heat exchange heat transport equipment that performs sensible heat or latent heat transport using external power such as a pump currently used, the energy used for external power is reduced to zero. And contribute to energy saving.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a loop heat exchange heat transport device of the present invention.

FIG. 2 shows another embodiment of the loop heat exchange heat transport device of the present invention.

FIG. 3 shows the relationship between the heat transfer amount and the heat load in the experimental results of the present invention.

FIG. 4 shows a conventional infiltration heat pipe type heat exchange heat transport device.

FIG. 5 shows a conventional CPL heat pipe type heat exchange heat transport device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat exchange circulating solution storage container 2 heat exchange circulating solution 3 steam 4 solution outlet 5 solution delivery pipe 6 vessel inner pipe 7 gas-liquid two-phase fluid delivery inlet 8 gas-liquid two-phase fluid delivery pipe 9 vessel surrounding pipe 10 Heat release heat exchanger 11 Heating heat exchanger 12 Steam bubbles A Circulating solution transport pipe B Circulating solution transport pipe 21 Heat exchanger combined with gas-liquid separator 22 Circulating solution for heat exchange 23 Circulating fluid for heat exchange 24 Steam 25 Circulating fluid transport Pipe 26 sensible heat release heat exchanger 27 membrane module 28 vapor transport pipe 29 condenser 30 solvent 31 semipermeable membrane 32 solution passage 33 porous material 34 heating heat exchanger 35 heat exchange circulating solution 36 steam 37 solution transport loop pipe 38 Condenser

Claims (2)

[Claims] 1. A solution delivery pipe 5 provided at a solution sending-out port 4 of a heat exchange circulating solution storage container 1 containing a heat exchange circulating solution 2 heated to a high temperature and passing through the heat exchange circulating solution storage container 1. A solution delivery pipe 5 of a series of circulating solution transport pipes A connecting a pipe 6 inside the vessel to be connected and a gas-liquid two-phase fluid delivery pipe 8 provided at a gas-liquid two-phase fluid delivery port 7 of the heat exchange circulating solution storage vessel 1. A loop heat exchange heat transport device characterized by comprising a sensible heat release heat exchanger 10 in a path and a heating heat exchanger 11 in a gas-liquid two-phase fluid inlet pipe 8 path. 2. A solution delivery pipe 5 provided at a solution sending-out port 4 of a heat exchange circulating solution container 1 accommodating a heat exchange circulating solution 2 heated to a high temperature, and an outer periphery of the heat exchange circulating solution container 1. A solution delivery pipe of a series of circulating solution transport pipes B connecting the circulating vessel surrounding pipe 9 and the gas-liquid two-phase fluid delivery pipe 8 provided at the gas-liquid two-phase fluid delivery port 7 of the heat exchange circulating solution storage vessel 1 A loop heat exchange heat transport device comprising: a sensible heat release heat exchanger 10 provided on five paths; and a heating heat exchanger 11 provided on eight gas-liquid two-phase fluid inlet pipes.