JPH03274329A - Heat accumulating heat exchanger - Google Patents

Abstract

PURPOSE:To eliminate operation to switch heat accumulation and heat removal and to derive heat from a heat accumulating body disposed in a primary fluid passage without using an intermediate system by a method wherein primary and secondary fluid passages are completely partitioned away from each other. CONSTITUTION:The interior of a housing 24 of a heat accumulating heat exchanger 14 is completely partitioned into primary fluid passages 30a and 30b a secondary fluid passage 30c by means of a partitioning device 21. Operation to switch heat accumulation and heat removal is eliminated, and there is also no need for an intermediate system. Primary fluid from a heat removal system flows through an input nozzle 26 to the primary flow passage of the heat accumulating heat exchanger 14, heat is adsorbed by heat accumulating bodies 20 arranged at the interior and discharged through an outlet nozzle 27. As a result, the heat accumulating body accumulates heat energy to increase temperature. Meanwhile, secondary fluid in a heat utilizing system flows through an inlet nozzle 28 for the secondary fluid to the secondary fluid passage and is discharged through an outlet nozzle 29. Since the heat accumulating body the temperature of which is increased is arranged in heat transfer relation with the partitioning device to partition the secondary fluid passage, the secondary fluid passage derives heat from the heat accumulating body through the partitioning device and adsorbs the heat.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to, for example, heated wastewater discharged from ordinary houses, stores, factories, etc., waste heat utilization systems such as heated exhaust, and residual heat from water supply to electric water heaters that use nighttime electricity. The present invention relates to a heat storage heat exchanger that can be used in heating and cooling systems combined with solar water heaters and heat pumps.

[Conventional technology] Conventionally, waste heat utilization systems have used methods such as using a heat exchanger or a heat storage tank, but the former cannot store heat and can only be used while the waste heat is being generated. The latter is considered preferable because the scope of use is therefore limited.

Figure 7 shows a typical conventional household waste heat utilization system that stores and uses heated waste water. In the figure, 1.1' indicates equipment that discharges hot water, such as a bath or washroom. , 2.2
゛ is a temperature-sensitive switching valve, and hot water from equipment 1' is stored in a heat storage tank 3 if the temperature is higher than a predetermined temperature. A heat transfer tube 4 connected to a water supply source 5 and a boiler 6 is inserted into a heat storage tank 3 that simply stores hot water from the equipment 1.1'. It can be taken out as a heat source for a heat pump (not shown).

However, in the above method, the heat storage tank 3 becomes large to obtain sufficient capacity, which is not practical.
As schematically shown in FIG. 8, a large number of heat storage bodies 8 each have a heat storage medium made of a chemical substance with latent heat of fusion sealed inside a spherical shell.
A method is adopted in which a heat storage container 9 consisting of a tank 7 containing a heat storage material is prepared, and the heat storage container 9 is connected as shown in FIG. 9 to store heat in the heat storage body 8.

That is, during heat storage in FIG. 9(a), the heat source equipment 1.1' side boat of the three-way switching valve 2 and the heat storage container 9 side boat are opened,
The boat on the load 12 side is closed, the pump 11 is operated, the hot water from the heat source equipment 1.1' is circulated to the primary system A, and heat is stored in the heat storage body 8 in the heat storage container 9, as shown in FIG. 9(b). At the time of heat dissipation shown in , close the boat on the heat source equipment 1.1'' side of the three-way switching valve 2, open the boat on the heat storage container 9 side and the boat on the load 12 side,
The pump 10 is operated to circulate hot water heated by the heat stored in the heat storage body 8 to the intermediate system B, and the heat is radiated to the load of the secondary system C in the heat exchanger 12.

[Problems to be Solved by the Invention] When the heat storage container 9 of FIG. 8 is used, which uses the heat storage body 8 made of a chemical substance having latent heat of fusion as a heat storage medium,
Compared to the heat storage tank 3 of FIG. 7 that uses water as a heat storage medium, the volume can be reduced to about 1/10, but since it is necessary to provide the intermediate system B and the heat exchanger 12, the entire system is Not only is this still a large-scale process that increases costs, but when switching from heat storage to heat radiation or vice versa, it is necessary to switch from the primary system to the intermediate system or vice versa, making the operation cumbersome.

Therefore, an object of the present invention is to provide a heat storage heat exchanger that does not require switching between heat storage and heat radiation, is easy to operate, and has a compact tank bottom.

[Means for Solving the Problem] In order to achieve this object, the regenerative heat exchanger according to the present invention comprises a hollow space to which an inlet nozzle and an outlet nozzle for a primary fluid and an inlet nozzle and an outlet nozzle for a secondary fluid are connected. a housing, and the interior of the hollow housing is partitioned to define a primary fluid passage communicating with the inlet nozzle and the outlet nozzle for a primary fluid, and a secondary fluid passage communicating with the inlet nozzle and the outlet nozzle for a secondary fluid, respectively. a partitioning device that
and a heat storage body disposed within the fluid passageway in heat transfer relationship with the partitioning device.

[Function] The inside of the housing of the heat storage heat exchanger is completely partitioned into a primary fluid passage and a secondary fluid passage by a partition device, so there is no need to switch between heat storage and heat radiation, and there is no need for an intermediate system. .

The primary fluid from the heat release system enters the primary fluid passage of the regenerative heat exchanger through the inlet nozzle, has heat absorbed by the heat storage body disposed therein, and is discharged through the outlet nozzle. As a result, the heat storage body stores thermal energy and increases its temperature.

On the other hand, the secondary fluid in the heat utilization system enters the secondary fluid passage from the inlet nozzle for the secondary fluid and exits from the outlet nozzle, but the heated heat storage body transfers heat to the partition device that partitions the secondary fluid passage. Because they are arranged in relation to each other, the secondary fluid removes heat from the heat storage body through the partitioning device and absorbs its heat.

[Embodiments] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which the same reference numerals indicate the same or corresponding parts.

FIG. 1 schematically shows an embodiment of the thermal storage heat exchanger 14 according to the present invention installed in an exhaust heat utilization system. The heat source equipment 2.2 is a temperature-sensitive three-way switching valve, and equipment 1.1
If the temperature of the hot water from The boat on the 13 side opens and discharges into the drainage canal 13.

The heat storage heat exchanger 14 is specially constructed in accordance with the present invention, and as described later, it has a built-in heat storage body and has a primary fluid passage of the primary system communicating with the heat source equipment side and a waste heat utilization side. It has a secondary fluid passage of a secondary system that communicates with the primary and secondary fluid passages.
The next fluid passage is separated by a support device or a support/partition plate.
The secondary fluid and the secondary fluid are partitioned so that they do not mix, and the heat storage body is supported by a support/partition plate. In the regenerative heat exchanger 14, the primary system hot water on the heat source equipment 1.1° side and the heat transfer tube 4 connected to the water supply source 5 and the boiler 6
Heat exchange is performed with the secondary system water supply having a

Next, details of the fi construction of the heat storage heat exchanger (hereinafter simply referred to as a heat exchanger) 14 will be described with reference to FIGS. 2 to 6. FIG. 2 shows a heat insulating material 3 covering the outer periphery of the heat exchanger 14.
4 (see FIG. 3) to show the entire heat exchanger 14, the heat exchanger 14 includes an upper lid 22 and a lower lid 23.
and intermediate frames 24a, 24b, and 24c, which are interconnected by a plurality of bolt and nut assemblies 37 to define a primary fluid passage and a secondary fluid passage, which will be described later. is forming.

The housing 24 includes a heat source equipment I for the primary fluid passage.
Inlet nozzle 26 that serves as the hot water outlet of II (heat release system)
and an outlet nozzle 27, an inlet nozzle 28 and an outlet nozzle 2 which serve as an outlet for the fluid of the heat utilization system to the secondary fluid passage.
9 is connected.

As shown in FIG. 1, the inlet nozzle 26 of the heat release system communicates with a conduit 2a having a switching valve 2.2'', and the outlet nozzle 27 communicates with a conduit 13a connected to the drainage f113. are doing. In addition, the inlet nozzle 28 of the heat utilization system communicates with the pipe line 5a connected to the water supply source 5, and the outlet nozzle 29
It communicates with a pipe line 6a connected to the boiler 6.

38 and 3B show a detailed horizontal cross-section of an example of the heat exchanger 14 described above, and each of the members 22, 24a, 24b, 24c, and 2
A support/partition plate or panel (partition device) 21, which can be manufactured by molding a thin plate made of a material such as aluminum, stainless steel, copper, etc. by press working or the like, is sandwiched between the parts 3 and 3. In the example, four partition plates 2
1, the space inside the housing 24 is five spaces 32
It is divided into a to 32c and 33a to 33b. Spaces 32a and 32b are located above l! as shown. 22,
The spaces 32b and 32c communicate with each other via a flow path 30a formed in the intermediate frames 24a and 24b.
, 24c and a flow path 30b formed in the lower lid 23. Further, the spaces 33a and 33b communicate with each other via flow passages 30c formed in the intermediate frames 24a, 24b and 24c.

Further, as shown in FIG. 38 and FIG. 3B, the inlet nozzle 26 and outlet nozzle 27 of the heat release system communicate with spaces 32a and 32c, respectively, and the inlet nozzle 28 and outlet nozzle 29 of the heat utilization system communicate with each other. are each space 33
b and 33a, so the above-mentioned space 32
a, the flow path 30a, the space 32b, the flow path 30b and the space 32c constitute a primary fluid path, and the space 33a,
The flow path 30c and the space 33b constitute a secondary fluid passage.

Since the primary fluid or the secondary fluid flows through each space in this way, a gasket 25 is schematically shown at the contact surface between each partition plate 21 and each member constituting the housing 24 to prevent fluid leakage. The flow path 3
A gasket 31 is attached to each penetrating portion of 0a, 30b and 30c.
are provided as shown schematically.

Next, the primary fluid passages include spaces 32a to 32c.
As best shown in FIGS. 4(a) and 4(b), a cylindrical heat storage body 20 is supported by a partition plate 21 and housed therein. The heat stored in the heat storage body 20 is transferred to the secondary fluid via the partition plate 21, so that the partition plate 21 is in contact with the above-mentioned cylindrical heat storage body 20 in a good heat transfer relationship.
Each partition plate 21 has a recess 21a having a shape that substantially matches the outer shape of the upper half or lower half of the heat storage body 20, as best shown in the sixth ffl(a) and (b). In the embodiment, among the pairs of partition plates 21 defining the spaces 33a and 33b of the secondary fluid passage, the upper partition plate has its recess 21a facing upward, and the lower partition plate has its recess 21a facing upward.
The concave side of 1a is arranged so as to face downward, and suitably supports the heat storage body 20 in the manner shown in FIG. 38.

Further, in order for the primary fluid and the secondary fluid to flow through the primary fluid passage and the secondary fluid passage in a good heat transfer relationship with the heat storage body 20, the spaces 32a to 32c and 33a to 33b are provided with respect to the space 32a. As typically shown in plan view in FIG. 5(a), a hard rubber or plastic rectifier block 35 engages with the hemispherical end of each heat storage body 20.
are arranged in a staggered manner, and the fluid flow is made into a zigzag flow as shown by the arrows due to the cooperative action of the rectifying block 35 and the upper cover 22 (see Figure 3) constituting the housing 24. I can do it.

The rectifying block 35 in the space 32a has a shape as shown in FIG. 5(b), and is perfectly aligned with the spherical end of the heat storage body 20, so that it will not shift even if the differential pressure of the fluid is applied. Rectifier block 35 used in space 32a
Although only the rectifying blocks used in other spaces are shown, the hard rubber or plastic material described above can be easily molded into a shape that fits the space. Incidentally, reference numeral 36 indicates a bolt hole through which the bolt of the bolt/nut assembly 37 for assembly described in connection with FIG. A corresponding position of the lid 23 is also drilled in alignment with the bolt hole 36.

Details of the heat storage body 20 are shown in FIGS. 4(a) and 4(b). The heat storage body 20 includes a covering body 20a formed in a cylindrical or capsule shape from aluminum or plastic, and a chemical substance 20b sealed within the covering body 20a. An injection port 20c is formed in the coating 20a, and the chemical substance 20b is introduced into the coating 20 from the injection port 20c.
After injecting so that an appropriate space 20d (which absorbs changes in the volume of the chemical substance 20b) remains inside a, the injection port 20c is
is closed. The chemical substance 20b is made of a material having a high latent heat of fusion in order to increase the heat storage capacity per unit volume, and transforms into a liquid in a heat storage state and into a solid in a heat radiation state. Such a chemical substance 20b consists of a heat storage medium that is a mixture of safe substances such as hydrated salts, eutectic compounds, organic compounds, etc., mainly food additives, and supercooling inhibitors and phase separation inhibitors.
Products with a melting temperature of -21°C to +64°C are commercially available.
You can use this. In addition, the heat storage body 20 itself is a spherical shell with a diameter of about 70 mm and a heat storage medium enclosed in it as described above, and is commercially available from Mitsubishi Corporation under the trade name "7 Yule". It's okay.

In the embodiment, the heat storage bodies 20 are arranged in 2×2 stages and 4 rows, but according to the required capacity, two stages of heat storage bodies 20, two partition plates 21, and two intermediate frames are stacked as a module. , it can be easily made into 2×n stages and m columns, and also,
Although its outer shape is cylindrical, it may be made spherical to further increase the heat transfer area. If the heat storage body is formed into a spherical shape, it is necessary to change the shape of the partition plate to match this shape. That is, as shown in FIGS. 6(C) to (e), the spherical heat storage body (
When using the partition plate (not shown), the partition plate (partition device) 2
A plurality of rows of hemispherical recesses 21°a are formed in 1′, and
In order to prevent fluid from bypassing between adjacent spherical heat storage bodies (not shown) housed in each row of recesses 21°a, each adjacent pair of recesses 21°a has a recess approximately from center to center. A flow blocking portion 21°b having a V-shaped cross section extending in the same direction as 21'a is integrally molded. It should be noted that in the case of such a shape, it is difficult to manufacture using iron-based materials, so it is preferable to use plastic.

When the regenerative heat exchanger 14 of the present invention, which is installed at the bottom of the tank as described above, is installed and operated in the exhaust heat utilization system shown in FIG. In this case, the switching valve 2.2° is opened to send hot water to the inlet nozzle 26 of the heat exchanger 14, and the hot water flows from the inlet nozzle 26 to the primary fluid passage in the housing 24, that is, the space 32a.
It leaves the housing 24 from the outlet nozzle 27 via the stream n30a, the space 32b, the stream 130b and the space 32c and is discharged into the drain 13. The hot water exchanges heat with a large number of heat storage bodies 20 while passing through the primary fluid passage, and the heated energy is stored in the heat storage bodies 20.

On the other hand, when it is desired to take out the thermal energy stored in the heat storage body 20 in this way to the heat utilization system, when the secondary fluid is supplied from the inlet nozzle 28, the secondary fluid flows through the secondary fluid passage.
That is, space 33a, flow F! @30c and space 33
b exits the housing 24 from the outlet nozzle 29. During this time, the secondary fluid removes heat from the heat storage body 20 and the fluid in the primary fluid passage to raise its temperature, and in this way, the waste heat is utilized.

In addition, in the above configuration, the primary and secondary fluids do not mix, but even if the partition plate 21 is damaged and a through hole is formed, the pressure in the heat utilization system is higher in the shell. Since the waste water from the heat release system is not mixed into the heat utilization system, the cleanliness of the heat utilization system can be maintained.

[Effect of the invention 1 According to the present invention, in the regenerative heat exchanger, the primary and secondary fluid passages are completely partitioned, so there is no need to switch between heat storage and heat radiation, and an intermediate system can be used. Heat can be taken out from the heat storage body disposed in the primary fluid passage, and its volume is approximately 115 mm compared to conventional heat storage tanks that store water and use it as a heat storage medium. This is particularly effective for relatively small-capacity waste heat utilization systems. Moreover, since the primary and secondary fluid passages are completely partitioned, it can also be used for preheating the water supply of oil or gas boilers and electric water heaters.

In a preferred embodiment, the support device is formed of a thin partition plate, and the partition plate has four parts with a relatively good heat transfer coefficient, and the heat storage body is housed in each of the partition plates, so that the support device is compact and has a high heat storage effect. A regenerative heat exchanger can be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an exhaust heat utilization system in which an embodiment of the regenerative heat exchanger according to the present invention is installed, and FIG. 2 is a schematic diagram of the regenerative heat exchanger used in the exhaust heat utilization system of FIG. 38 is a sectional view of the regenerative heat exchanger shown in FIG. 2, FIG. 3B is a sectional view taken along line 3^-3 in FIG. ) and (b) are horizontal and vertical cross-sectional views of the heat storage body used in the thermal storage heat exchanger of Fig. 2, and Fig. 5 (
a) is a plan view of the primary fluid passage in the regenerative heat exchanger of Fig. 2, and Fig. 5(b) is a perspective view showing the rectifying block used in the primary fluid passage of Fig. 5(a). Figure, Figure 6 (
a) and (b) are perspective views partially showing a partition plate in which the concave portion faces upward and a partition plate in which the concave portion faces downward;
) is a perspective view showing a modified embodiment of the partition plate, FIG. 6(d)
and (e) is 8d-6d&! of FIG. 6(C). and 6e
6eii, FIG. 7 is a schematic diagram of a waste heat utilization system using a conventional heat storage tank, FIG. 8 is a partially cutaway front view of a conventional heat storage heat exchanger, and FIG. Diagram (a)
and (b) is a system diagram illustrating the flow of fluid during heat storage and heat radiation in the exhaust heat utilization system using the thermal storage heat exchanger of FIG. 8. 14... Heat storage heat exchanger 20... Heat storage body 21.2
1'...Partition plate (partition W) 24...Housing
26... Inlet nozzle 27... Outlet nozzle
28... Inlet nozzle 29... Outlet nozzle 30a, 30b... Flow path (primary fluid passage) 30c...
・Flow 118 (secondary fluid passage) 32a, 32b, 32c・
= Space (primary fluid communication 1i'8) 33a, 33b...
・Space (secondary fluid passage) Figure 2 B

Claims (1)

[Claims] a hollow housing to which an inlet nozzle and an outlet nozzle for a primary fluid and an inlet nozzle and an outlet nozzle for a secondary fluid are connected; 2 communicating with a fluid passageway and said inlet and outlet nozzles for a secondary fluid;
A regenerative heat exchanger having a partitioning device respectively defining secondary fluid passages, and a heat storage body disposed within the primary fluid passageway in heat transfer relationship with the partitioning device.