JPH06265286A - Method and apparatus for heat exchanging - Google Patents

Abstract

PURPOSE:To provide a method and an apparatus for heat exchanging of which the heat recovery rate exceeds 50%. CONSTITUTION:A first system 11 at 100 deg.C and a second system 12 at 0 deg.C are formed of isothermal areas 14a, 14b and 15a, 15b having heat exchangers 18a, 18b and 19a, 19b to be sequentially heat-exchanged between the regions having different systems by operating a heat recovery pump 22 and fluid switching valves 20a, 20b and 21a, 21b so that the temperature of at least one region of the system approaches the initial temperature of the opposite side from an average temperature of the initial temperatures of the regions. That is, heat exchanging is first executed between the regions 14a and 15a, the both are set to an average temperature of 50 deg.C, then heat-exchanging is conducted between the regions 14a and 15b, the both are set to 25 deg.C, then heat-exchanging is conducted between the regions 15a and 14b, the both are set to 75 deg.C, and then heat-exchanging is executed between the regions 15b and 14b, and the both are set to 50 deg.C. Thus, the temperatures of the systems approach the initial temperature of the opposite side system from the average temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanging method and a heat exchanging device for exchanging heat between a plurality of systems having different temperatures, for example, a sensible heat recovery device such as a refrigerator or a heat pump device using a hydrogen storage alloy. The present invention relates to a heat exchange method and a heat exchange device used in

[0002]

2. Description of the Related Art Conventionally, for example, when heat exchange is performed between two systems having different temperatures, the configuration is as shown in the connection diagram of FIG. That is, the system 1 having a high temperature T _{H and} the system 2 having a low temperature T _L (where T _L <T _H ) are arranged in the heat exchangers 5 and 6 in the packings 3 and 4 housed in the respective systems. Is provided, a pipe 8 in which a pump 7 is inserted is connected between the heat exchangers 5 and 6, and the pump 7 circulates a fluid between the heat exchangers 5 and 6.

When the pump 7 is operated to exchange heat between the two systems 1 and 2, the fluid flows through the pipe 8 and circulates between the two heat exchangers 5 and 6. At this time, the fluid is heated via the heat exchanger 5 by the hot filler 3 of the system 1 of high temperature T _H and also of the system 2 of low temperature T _L.
It is cooled through the heat exchanger 6 by the filling material 4 which has a low temperature. At the same time, the fillers 3 and 4 are cooled or heated by the fluid. If the heat capacities of the two systems 1 and 2 are the same, the heat transfer between the two systems 1 and 2 disappears when the temperatures of the two systems become equal, and the heat between the two systems 1 and 2 disappears. The exchange ends.

Therefore, in the above-mentioned prior art, the temperature T of both systems 1 and 2 is the average value T _M (= (T _H
It ends when + T _L ) / 2) and cannot be further heated or cooled. That is, the heat recovery rate could not exceed 50%. Therefore, in a refrigerator or heat pump device, etc. configured to alternately adsorb and desorb hydrogen using a hydrogen storage alloy, preheating or precooling by recovering sensible heat of the hydrogen storage alloy during adsorption and desorption It could not be carried out with the recovery rate exceeding 50%. Further, in order to make the sensible heat recovery rate exceed 50%, a heat accumulator has to be provided, and the structure is not always simple.

[0005]

As described above, the conventional one cannot have a heat recovery rate exceeding 50%. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a heat exchange method and a heat exchange apparatus that can achieve a heat recovery rate of more than 50% with a simple configuration. It is in.

[0006]

The heat exchange method and the heat exchange apparatus of the present invention include a heat exchange method in which a fluid is circulated between a high temperature first system and a low temperature second system. In the exchange method, the first and second systems are divided into a plurality of regions, heat exchange is performed between one region of the first system and one region of the second system, and both regions are treated as a first intermediate region. The process of making the temperature substantially equal to that of the first system is followed by heat exchange between the one region of the first system and the other region of the second system so that both regions have a second temperature lower than the first intermediate temperature. Is approximately equal to the intermediate temperature of the second system, and heat is exchanged between one region of the second system and the other region of the first system so that both regions have a temperature higher than the first intermediate temperature. Between the process of making the temperature substantially equal to the intermediate temperature and the other region of the second system having the second intermediate temperature and the other region of the first system having the third intermediate temperature. Heat exchange In a heat exchange device for exchanging heat by circulating a fluid between at least two systems having different temperatures, each system has a plurality of isothermal regions. Each area has a means for exchanging heat with other areas, and a fluid switching means for sequentially exchanging heat between areas having different systems and different temperatures according to the progress of heat exchange. The device is characterized in that

[0007]

The heat exchanging method and heat exchanging apparatus configured as described above are composed of a plurality of isothermal regions, and each region has a means for exchanging heat with another region between at least two systems at different temperatures. Then, the fluid switching means sequentially performs heat exchange between different regions so that the temperature of at least one region of each system becomes closer to the temperature of the other region than the average temperature of the initial temperature of each region. . That is, for example, between a high-temperature first system and a low-temperature second system that are divided into a plurality of regions of equal heat capacity, first, one region of the first system and one region of the second system Heat is exchanged with the zone to make them approximately equal to the average temperature of the initial temperatures of both zones, and thereafter heat is exchanged between one zone of the first system and another zone of the second system. The two regions are exchanged with each other to an intermediate temperature lower than the average temperature and the heat exchange between the one region of the second system and the other region of the first system is performed so that both regions have the average temperature. It is made approximately equal to the higher intermediate temperature, and after that, another region of the second system having the lower intermediate temperature and the first intermediate temperature having the higher intermediate temperature.
The temperature of the first and second systems is closer to the original temperature of the counterpart system than the average temperature by performing heat exchange with another region of the system. As a result, the heat recovery rate can exceed 50% with a simple structure.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to FIG.
2 and FIG. 2. FIG. 1 is a connection diagram, and FIG. 2 is a diagram shown for explaining an operating state.

In FIG. 1 and FIG. 2, the heat exchange device 10 is composed of two first and second systems 11 and 12 for exchanging heat, and each system 11 and 12 has a partition wall 1 inside.
Two regions 14a, 14b, 15 insulated by 3
It is divided into a and 15b. In addition, each area 14a, 14
Fillers 16 and 17 are housed inside b, 15a and 15b. And each area 14a, 14b, 15a, 1
The heat capacities of 5b are made equal, and the heat capacities of the first system 11 and the second system 12 are made equal. The fillings 16 and 17 are designed to be heated or cooled by means (not shown) so that the device 1
The initial temperature condition before heat exchange of 0 is determined.

Further, each area 14a, 14b, 15a, 1
Heat exchangers 18a, 18b, 19a, 19b of the same shape are provided in the fillings 16, 17 housed in 5b. And these heat exchangers 18a, 18b, 19
fluid switching valves 20a, 20 that are three-way valves
Pipes 23 in which b, 21a, 21b and the heat recovery pump 22 are inserted are connected.

With this, the heat recovery pump 22 is operated and the fluid switching valves 20a, 20b, 21a, 21b are appropriately switched, so that the heat exchangers 18a, 18b, 19 can be exchanged.
A predetermined fluid flow path is formed between a and 19b, and the fluid can be circulated through the pipe 23.

Next, the heat exchange device 1 thus constructed
A method of heat exchange at 0 will be described. Heat exchange device 10
14a, 14b, 15a, 15 of each system 11, 12 of
In b, for example, the fillers 16 and 17 are heated or cooled by a means (not shown) prior to heat exchange so that the regions 14a and 14b are 100 ° C. and the regions 15a and 15b are 0 ° C.
The temperature condition is.

By exchanging heat between the first system 11 and the second system 12 through the following processes, both systems 11,
The temperature conditions of 12 are reversed. Fluid switching valve 20a, 20b, 21a, 21b in each process
Position is as shown in X and Y of FIG.
The temperature changes of a, 14b, 15a, and 15b are also as shown in FIG. Further, for the sake of easy understanding of the explanation, it is assumed that the heat exchange is ideally performed and the temperatures of the two parties are equal after the heat exchange.

First, in the first step, the fluid switching valve 20a,
When the positions of 20b, 21a, and 21b are in the state shown in FIG. 1, the heat recovery pump 22 is actuated so that the fluid sequentially flows from the heat recovery pump 22 to the fluid switching valve 20a, the heat exchanger 18a, and the fluid switching valve. 20b, 21a, heat exchanger 1
9a, the switching valve 21b, and the heat recovery pump 22 are returned to the pipe 23.

Heat is exchanged between the heat exchanger 18a in the region 14a and the heat exchanger 19a in the region 15a while the fluid flows. As a result, both areas 14a and 15a
The fillings 16 and 17 are cooled or heated via the heat exchangers 18a and 19a, and the temperature of both regions 14a and 15a becomes an average value of both 50 ° C.

In the next second step, the fluid switching valve 20a is rotated 90 ° counterclockwise in the figure, and the fluid switching valve 20b is rotated.
Rotate 90 ° clockwise. With this, the fluid returns from the heat recovery pump 22 to the fluid switching valves 20a and 20b, the heat exchanger 18b, the fluid switching valve 21a, the heat exchanger 19a, the switching valve 21b, and the heat recovery pump 22 in order.
Flow through 3.

Thereby, the heat exchanger 18b in the region 14b
And the heat exchanger 19a in the area 15a exchanges heat.
As a result, the fillers 16 and 17 in both regions 14b and 15a are cooled or heated through the heat exchangers 18b and 19a, and the temperatures in both regions 14b and 15a have an average value of 75 ° C.
become.

In the next third step, the fluid switching valve 20a,
21b is rotated clockwise by 90 °, and the fluid switching valve 20
Rotate b, 21a 90 ° counterclockwise. With this, the fluid flows from the heat recovery pump 22 to the fluid switching valve 20a, the heat exchanger 18a, the fluid switching valves 20b, 21a, 21b, the heat exchanger 19b, and the heat recovery pump 22 in order to return to the pipe 23. Shed.

As a result, the heat exchanger 18a in the region 14a
And the heat exchanger 19b in the region 15b exchanges heat.
As a result, the fillers 16 and 17 in both regions 14a and 15b are cooled or heated via the heat exchangers 18a and 19b, and the temperatures in both regions 14a and 15b have an average value of 25 ° C.
become.

In the next fourth step, the fluid switching valve 20a is rotated 90 ° counterclockwise in the figure, and the fluid switching valve 20b is rotated.
Rotate 90 ° clockwise. With this, the fluid is sequentially transferred from the heat recovery pump 22 to the fluid switching valves 20a and 20b, the heat exchanger 18b, the fluid switching valves 21a and 21b, and the heat exchanger 19.
b, and flow through the pipe 23 so as to return to the heat recovery pump 22.

As a result, the heat exchanger 18b in the region 14b
And the heat exchanger 19b in the region 15b exchanges heat.
As a result, the fillers 16 and 17 in both regions 14b and 15b are cooled or heated through the heat exchangers 18b and 19b, and the temperatures in both regions 14b and 15b have an average value of both 50 ° C.
become.

By the above-mentioned processes, the first system 11 has the regions 14a, 1 which are both 100 ° C.
4b becomes 25 ℃ and 50 ℃, the average value of the system is 37.5 ℃
Becomes In addition, the second system 12 has a region 1 where both temperatures are 0 ° C.
5a and 15b become 75 ℃ and 50 ℃, and the average value of the system is 6
It becomes 2.5 ° C. That is, the heat recovery rate reaches 62.5% without providing a heat accumulator or the like, and the temperature conditions of the first system 11 and the second system 12 are reversed from those of the initial condition.

In this embodiment, the heat recovery pump 22 is set to 1
Although two units are provided so that the second and third steps can be performed at the same time, the time required for heat exchange can be shortened.

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described with reference to FIG. FIG. 3 is a connection diagram, FIG. 4 is a diagram shown for explaining an operating state, and FIG. 5 is a diagram showing a sensible heat recovery rate with respect to the number of divided regions.

3 and 4, the heat exchanging device 30 is composed of two first and second systems 31 and 32 for exchanging heat, and each system 31 and 32 has a partition wall 3 inside.
Three regions 34a, 34b, 34 insulated by 3
c, 35a, 35b, 35c. In addition, each area 34a, 34b, 34c, 35a, 35b, 35c
Fillers 36 and 37 are housed inside. And each area 34a, 34b, 34c, 35a, 35b, 35
The heat capacities of c are made equal, and the heat capacities of the first system 31 and the second system 32 are made equal. The fillings 36 and 37 are heated or cooled by means (not shown) so that the device 30
The initial temperature condition before heat exchange is determined.

Further, each of the areas 34a, 34b, 34c, 3
The heat exchangers 38a, 38b, 38c, 3 having the same shape are provided in the packings 36, 37 housed in the 5a, 35b, 35c.
9a, 39b, 39c are provided. And these heat exchangers 38a, 38b, 38c, 39a, 39b,
39c includes fluid switching valves 40a, 40b, which are three-way valves,
40c, 40d, 41a, 41b, 41c, 41d,
Pump fluid switching valves 42 and 43, which are also three-way valves,
A pipe 46 in which the heat recovery pumps 44 and 45 are inserted is connected.

Thereby, the fluid recovery valves 40a, ..., 40d, 41 are operated while the heat recovery pumps 44, 45 are operated.
, 41d and the fluid switching valves for pumps 42, 43 are appropriately switched, so that each heat exchanger 38a, 38b, 38
A predetermined fluid flow path is formed between c, 39a, 39b, and 39c, and the fluid can be circulated through the pipe 46.

Next, the heat exchanging device 3 thus constructed
A method of heat exchange at 0 will be described. Heat exchange device 30
Regions 34a, 34b, 34c, 35 of the respective systems 31, 32 of
In a, 35b and 35c, for example, the packings 36 and 37 are heated or cooled by a means (not shown) prior to heat exchange, and the regions 34a, 34b and 34c are heated to 100 ° C.,
Regions 35a, 35b, and 35c have a temperature condition of 0 ° C.

Then, heat is exchanged between the first system 31 and the second system 32 through the following processes, so that both systems 31,
The temperature conditions of 32 are reversed. Each fluid switching valve 40a, ..., 40d, 41a in each process
The positions of 41d, 42, 43 are X, Y, V, W in FIG.
And the ON / OFF of heat recovery pumps 44 and 45.
OFF and each area 34a, 34b, 34c, 35a, 3
The temperature changes of 5b and 35c are also as shown in FIG. Further, in order to make the explanation easy to understand, it is assumed that the heat exchange is ideally performed and the temperatures between the two parties are equal after the heat exchange.

First, in the first step, each fluid switching valve 40
, 40d, 41a, ..., 41d, 42, 43 are in the state shown in FIG. 3, and by operating only the heat recovery pump 44, the fluid becomes heat recovery pump 44.
The fluid flows through the pipe 46 so as to return to the fluid switching valve 42, the heat exchanger 38a, the fluid switching valve 40b, the heat exchanger 39a, the switching valves 40a and 43, and the heat recovery pump 44 in this order.

Heat is exchanged between the heat exchanger 38a in the region 34a and the heat exchanger 39a in the region 35a while the fluid flows. As a result, both regions 34a and 35a
The fillings 36, 37 of FIG. 3 are cooled or heated via the heat exchangers 38a, 39a, and the temperatures of both regions 34a, 35a reach an average value of 50 ° C. for both.

In the next second step, the fluid switching valve 40a,
40b is rotated 90 ° clockwise in the figure, and the fluid switching valves 41a and 41b are rotated 90 ° counterclockwise to operate the heat recovery pumps 44 and 45. With this, the fluid discharged from the heat recovery pump 44 is supplied to the fluid switching valve 42 and the heat exchanger 38.
a, fluid switching valve 40b, heat exchanger 39b, switching valve 40
a, 43, and then return to the heat recovery pump 44.

As a result, the heat exchanger 38a in the region 34a is
And the heat exchanger 39b in the region 35b exchanges heat.
As a result, the fillers 36, 37 in both regions 34a, 35b are cooled or heated via the heat exchangers 38a, 39b, and the temperatures in both regions 34a, 35b have an average value of 25 ° C.
become.

The fluid discharged from the heat recovery pump 45 is
The heat exchanger 38b, the fluid switching valves 40d and 41b, the heat exchanger 39a, the switching valves 41a and 40c, and the heat recovery pump 45 flow back.

As a result, the heat exchanger 38b in the region 34b is
And the heat exchanger 39a in the region 35a exchanges heat.
As a result, the fillers 36, 37 in both regions 34b, 35a are cooled or heated via the heat exchangers 38b, 39a, and the temperatures in both regions 34b, 35a have an average value of both 75 ° C.
become.

In the next third step, the fluid switching valve 40a,
40b is rotated 90 ° counterclockwise, and the fluid switching valve 41
The a and 41b are rotated 90 ° clockwise, and the heat recovery pump 44 is stopped. When only the heat recovery pump 45 is operated, the fluid flows from the heat recovery pump 45 to the heat exchanger 38b, the fluid switching valves 40d and 41b, the heat exchanger 39b.
Flows back to the switching valves 41a, 40c and the heat recovery pump 45.

As a result, the heat exchanger 38b in the region 34b is
And the heat exchanger 39b in the region 35b exchanges heat.
As a result, the fillers 36 and 37 in both regions 34b and 35b are cooled or heated through the heat exchangers 38b and 39b, and the temperatures in both regions 34b and 35b have an average value of both 50 ° C.
become.

In the next fourth step, the fluid switching valve 40c,
40d and 43 are rotated clockwise by 90 °, and the fluid switching valves 41c, 41d and 42 are rotated counterclockwise by 90 ° to operate the heat recovery pumps 44 and 45. With this, the fluid discharged from the heat recovery pump 44 is passed back to the fluid switching valve 42, the heat exchanger 38c, the fluid switching valve 41d, the heat exchanger 39b, the switching valves 41c and 43, and the heat recovery pump 44. Shed.

As a result, the heat exchanger 38c in the region 34c
And the heat exchanger 39b in the region 35b exchanges heat.
As a result, the fillers 36, 37 in both regions 34c, 35b are cooled or heated via the heat exchangers 38c, 39b, and the temperatures in both regions 34c, 35b have an average value of both 75 ° C.
become.

The fluid discharged from the heat recovery pump 45 is
Heat exchanger 38b, fluid switching valve 40d, heat exchanger 39c,
The flow returns to the switching valve 40c and the heat recovery pump 45.

As a result, the heat exchanger 38b in the region 34b is
And the heat exchanger 39c in the region 35c exchanges heat.
As a result, the fillers 36, 37 in both regions 34b, 35c are cooled or heated via the heat exchangers 38b, 39c, and the temperature in both regions 34b, 35c is 25 ° C., the average value of both.
become.

In the next fifth step, the fluid switching valve 40c,
40d is rotated 90 ° counterclockwise, and the fluid switching valve 41
The c and 41d are rotated clockwise by 90 ° to stop the heat recovery pump 45. When only the heat recovery pump 44 is operated, the fluid is transferred from the heat recovery pump 44 sequentially from the fluid switching valve 42, the heat exchanger 38c, the fluid switching valve 41d, the heat exchanger 39c, the switching valves 41c and 43, and the heat recovery valve. Flow back to the pump 44.

As a result, the heat exchanger 38c in the region 34c
And the heat exchanger 39c in the region 35c exchanges heat.
As a result, the fillers 36, 37 in both regions 34c, 35c are cooled or heated via the heat exchangers 38c, 39c, and the temperatures in both regions 34c, 35c have an average value of both 50 ° C.
become.

After the above-mentioned processes, the first system 31 has the regions 34a, 3 which are both 100 ° C.
4b and 34c are 25 ° C, 25 ° C and 50 ° C, and the average value of the system is about 33.3 ° C. In the second system 32, the regions 35a, 35b, and 35c, which were both 0 ° C., have a temperature of 75 ° C.
5 ° C. and 50 ° C., and the average value of the system is about 66.7 ° C. That is, the heat recovery rate is about 6 without installing a heat storage device.
6.7% is reached, and the first system 31 and the second system 32 are reversed in temperature condition different from the initial condition.

In each of the above embodiments, two systems are used.
Although it is divided into one region or three regions, the heat recovery rate can be further improved by increasing the number of divisions N, as shown by the solid line in FIG. In FIG. 5, the broken line shows changes in the heat recovery rate when various temperature differences ΔT _P between the fluid flowing through the heat exchanger and the filling material filled in the area are taken.

Next, a refrigerator according to a third embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is a connection diagram, and FIG. 7 is a diagram shown for explaining an operating state.

In FIG. 6 and FIG. 7, the refrigerator 50 uses, for example, hydrogen or a hydrogen storage alloy as a working medium or a reaction medium for reacting the working medium, and utilizes heat generation or heat absorption during adsorption / desorption. The second unit 51, 52 is provided, and the inside of the first unit 51 is divided into chambers 54a, 54b, 56a, 56 by a partition wall 53 having a heat insulating property.
Heat source side container 54 and heat utilization side container 56 partitioned into b
It is configured with. Similarly, the second unit 52 is also configured to include a heat source side container 55 and a heat utilization side container 57 which are partitioned by chambers 55a, 55b, 57a, 57b by partition walls 53 having heat insulating properties. There is.

Then, the first and second units 51, 52
In the heat source side chambers 54a, 54b, 55a, 55b, heat source side alloys 58, 59 made of a hydrogen storage alloy are stored, and in the heat utilization side chambers 56a, 56b, 57a, 57b, the heat source side alloy 58 is contained. , 59 and utilization side alloys 60, 61 made of hydrogen storage alloys having different temperature equilibrium pressure characteristics. Furthermore, both units 51 and 52 are provided in the chamber 5 on the heat source side.
4 a, 54 b, 55 a, 55 b and the corresponding heat utilization side chambers 56 a, 56 b, 57 a, 57 b are connected to each other by a hydrogen valve 62.
Hydrogen pipes 64a, 64b, 65a, 65b for inserting and connecting a, 62b, 63a, 63b are provided.

The chambers 54a, 54b, 55a, 55b,
56a, 56b, 57a, 57b have heat exchange parts 67a, 67b, 68a, 68b, 69 inside them, respectively.
a, 69b, 70a, 70b are provided, and the same fluid having different temperature states, for example, a heat source fluid A made of water, a heat utilization fluid B, and a cooling fluid C are circulated. Then, on the side where the heat source side alloys 58, 59 are provided, the fluid switching valves 71a, 7 are arranged so that the heat source fluid A and the cooling fluid C flow to the heat exchange portions 67a, 67b, 68a, 68b.
2a, 71b, 72b, 73a, 74a, 73b, 74
b, 75a, 76a, 75b, 76b, 77a, 78
a, 77b, 78b, 79, 80, 81, 82,
A pipe 84 in which the sensible heat recovery pump 83 is inserted is connected.

On the side where the utilization side alloys 60 and 61 are provided, a fluid switching valve (not shown) is also provided so that the heat utilization fluid B and the cooling fluid C flow through the heat exchange portions 69a, 69b, 70a and 70b by switching. A pipe 85 is provided which describes only the parts.

The refrigerator 50 configured as described above operates as follows. That is, in the connection state as shown in FIG. 6, the heat source fluid A is caused to flow into the chambers 54a and 54b of the container 54 of the first unit 51, and the heat exchange portions 67a and 67b thereof.
The heat source side alloy 58 is heated through the respective chambers 54a and 54b.
The pressure of hydrogen absorbed in the heat source side alloy 58 inside is increased. Then, when the hydrogen valves 62a and 62b are opened, hydrogen flows to the container 56 side, and the use side alloy 60 of each chamber 56a and 56b.
Absorbs hydrogen. At this time, the heat generated by the use side alloy 60 causes the cooling fluid C to flow through the heat exchange portions 69a, 69b of the chambers 56a, 56b.
It is cooled by pouring into.

On the other hand, in the second unit 52, the hydrogen flows through the hydrogen valves 63a and 63b, and the utilization side alloy 61 in the chambers 57a and 57b of the container 57 to the chambers 55a and 55b of the container 55. Flowing toward the heat source side alloy 59
Is absorbed by. The heat of the heat source side alloy 59 at this time is cooled by flowing the cooling fluid C into the heat exchange portions 68a and 68b of the chambers 55a and 55b. Further, in the utilization side alloy 61 that is undergoing an endothermic reaction, the heat utilization fluid B is supplied to the chambers 57a, 57a.
Cold heat can be obtained by flowing the heat to the heat exchange parts 70a and 70b of b.

Next, sensible heat recovery will be described. The first and second units 51, 52 are each of the heat source side chambers 54a, 54
b for each of b, 55a, 55b, phase I of the hydrogen desorption process shown by the thick solid line in FIG. 7, the sensible heat recovery process shown by the one-dot chain line, the hydrogen absorption process shown by the thin solid line, and the sensible heat preheating process shown by the two-dot chain line.
The XII cycle operates by shifting the phase and repeating it in sequence. Then, in the phases I to XII, the fluid switching valves 71a, 71b, ...
, 78a, 78b, 79, to 82 are as indicated by X, Y, and V as shown in the drawing, and are blank when the switching valve position is not specified.

Therefore, the first and second units 51, 52
See the operating state of sensible heat recovery and sensible heat preheating. First, the chambers 54a, 54 of the first unit 51 before sensible heat recovery and sensible heat preheating
It is assumed that the temperature of the heat source side alloy 58 stored in b is 90 ° C. and the temperature of the heat source side alloy 59 stored in the chambers 55a and 55b of the second unit 52 is 30 ° C. In order to make the explanation easy to understand, it is assumed that ideal heat exchange is performed and the temperatures of the two parties are equal after the heat exchange.

In Phase II, the heat source side alloy 58 of the chamber 54a of the first unit 51 and the heat source side alloy 59 of the chamber 55a of the second unit 52 are in a state where the heat recovery pump 83 is in operation.
Are heat-exchanged with each other via the heat exchange portions 67a and 68a, and the temperatures of both are changed from 90 ° C and 30 ° C to 60 ° C.

Phase III is for room 54 after Phase II.
The heat source side alloy 58 of a and the heat source side alloy 59 of the chamber 55b of the second unit 52 are heat-exchanged via the heat exchange portions 67a and 68b, and the temperatures of both are 60 ° C. and 30 ° C. to 45 ° C.
To

In phase IV, after the phase III, the heat source side alloy 58 of the chamber 54b of the first unit 51 and the heat source side alloy 59 of the chamber 55a are heat-exchanged via the heat exchange portions 67b and 68a, and both of them are exchanged. Temperatures 90 ° C and 60 ° C to 75 ° C
To

Phase V is the chamber 54b after Phase IV.
The heat source side alloy 58 and the heat source side alloy 59 of the chamber 55b are heat-exchanged via the heat exchange portions 67b and 68b, and the temperatures of the both are set to 75 ° C and 45 ° C to 60 ° C.

In phase VI, after the phase V, the heat source side alloy 58 of 45 ° C. and 60 ° C. in the chambers 54a and 54b of the first unit 51 is cooled to 30 ° C. by the cooling fluid C.
Cool down to. In addition, the chamber 55a of the second unit 52,
Heat source side alloy 59 which is 75 ° C and 60 ° C of 55b
Is heated to 90 ° C. by the heat source fluid A.

Through the above process, the first and second units 51, 52 are again in a state capable of adsorbing / desorbing hydrogen. Also, the first and second units 51, 5
2 indicates that the heat source side alloys 58, 59 are cooled by the cooling fluid C or heated by the heat source fluid A by heat exchange from 90 ° C. to an average value of 52.5 ° C. and 30 ° C. to an average value of 67.5 ° C. It will be pre-cooled and pre-heated, and sensible heat recovery with a recovery rate of 62.5% will be performed without providing a heat storage device or the like.

In this embodiment, the containers 54, 55, 5
6 and 57 are each divided into two, but may be divided into three or more, and the sensible heat recovery rate can be improved in response to an increase in the number of divisions, and by increasing the number of heat recovery pumps The heat recovery time can be shortened. Further, the side provided with the utilization side alloys 60, 61 is configured in the same manner as the side provided with the heat source side alloys 58, 59,
The same heat exchange as described above may be performed to further improve the sensible heat recovery rate. Further, it can be used as a heat pump device by changing the temperature relationship between the heat source fluid A and the heat utilization fluid B with the same configuration as that of the present embodiment.

In each of the above-mentioned embodiments, the case where the fillers in the divided regions, the heat source side alloys in the respective chambers, or the heat side alloys in the respective chambers have the same heat capacity has been described, but they may be different, or after heat exchange. The temperatures of the two may be substantially the same, and the present invention can be implemented by appropriately changing the temperatures without departing from the scope of the invention.

[0064]

As is apparent from the above description, the present invention is composed of a plurality of isothermal zones, each zone having at least two systems of different temperatures having means for exchanging heat with another zone, The fluid switching means sequentially performs heat exchange between different regions, and the temperature of at least one region of each system is closer to the temperature of the other region than the average temperature of the initial temperature of each region. As a result, the heat recovery rate can exceed 50% with a simple configuration.

[Brief description of drawings]

FIG. 1 is a connection diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram for explaining an operating state of the first embodiment of the present invention.

FIG. 3 is a connection diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram for explaining an operating state of the second embodiment of the present invention.

FIG. 5 is a diagram showing a sensible heat recovery rate with respect to the number of divided regions according to the present invention.

FIG. 6 is a connection diagram showing a third embodiment of the present invention.

FIG. 7 is a diagram shown for explaining an operating state of the third embodiment of the present invention.

FIG. 8 is a connection diagram showing a conventional example.

[Explanation of symbols]

 11, 12 ... System 13 Partition wall 14a, 14b, 15a, 15b ... Area 16, 17 ... Packing 18a, 18b, 19a, 19b ... Heat exchanger 20a, 20b, 21a, 21b ... Fluid switching valve 22 ... Heat recovery Pump 23 ... Piping

Claims (2)

[Claims] 1. A heat exchange method in which a fluid is circulated between a high-temperature first system and a low-temperature second system to perform heat exchange, and the first and second systems are provided in a plurality of regions. And heat exchange between the one region of the first system and the one region of the second system to make both regions substantially equal to the first intermediate temperature, and then the first region. Heat exchange between one region of the second system and another region of the second system to make both regions substantially equal to a second intermediate temperature lower than the first intermediate temperature, and A step of performing heat exchange between one region of the second system and another region of the first system to make both regions substantially equal to a third intermediate temperature higher than the first intermediate temperature; And the second
The other one of the second system and the third
And a step of performing heat exchange with another region of the first system having an intermediate temperature of 1. 2. A heat exchange device for circulating fluid between at least two systems of different temperatures to exchange heat, wherein each system is composed of a plurality of regions of equal temperature, and each region is different from other regions. A heat exchanging device having a means for exchanging heat and a fluid switching means for sequentially exchanging heat between the regions having different systems and different temperatures according to the progress of heat exchange.