JPS6020666B2 - Absorption heat storage device - Google Patents

Description

[Detailed Description of the Invention] The present invention is capable of storing heat using the latent heat of a heat transfer fluid and an absorbing solution, making it possible to downsize the heat storage tank, reduce heat loss, and simplify the heat insulation structure by storing heat in a low-temperature castle. The object of the present invention is to provide an absorption type heat storage device suitable for a system that uses late-night power.

Adjunct heat storage devices In particular, this type of device that uses late-night electricity uses the sensible heat of water to store heat at low or high temperatures, so the heat storage tank is large because the amount of heat stored per unit volume is small. It takes up a large amount of installation space, and because the structure of the building housing the heat storage tank has to be highly load-bearing, it poses an economic disadvantage in that equipment costs soar.

Furthermore, it has the disadvantage of large heat loss from the heat storage tank, and since it is made of heat-insulating wire to prevent heat loss, there are many practical problems such as an increase in the cost of the waste itself - running costs due to late-night electricity usage. There was virtually no hope for a decrease in

The present invention has been made in view of the fact that the conventional devices have many problems, and aims to provide a new heat storage device that can fundamentally eliminate the various defects mentioned above. In particular, the basis of this is that it is possible to generate crab fever at normal temperatures by utilizing the latent heat of both a heat-receiving fluid such as water and an absorbing solution such as lithium bromide solution. The goal is to make it possible to put this system into practical use by completing it as a device with a specific structure.

However, in the present invention, a first heat exchanger having a sealed structure contains a hot soot fluid such as water that can change between gas and liquid phases, and a first heat exchanger and a second heat exchanger are built in the liquid phase of the hot soot fluid. a heat storage tank, a second heat exchanger having a closed structure, containing an absorption solution that generates absorption heat when absorbing and diluting the hot soot fluid, and having a third heat exchanger and a fourth heat exchanger built in the absorption solution; Heat storage tank, etc. No. 1
A piping line "including the first heat exchanger, the third heat exchanger, and the compressor" in which an on-off valve is opened in the pipe line that is arranged to pass between the gas phase parts of the heat storage tank and the second heat storage tank. The first heat exchanger acts as an evaporator and the third heat exchanger acts as a condenser, and a heat storage cycle operation of the refrigerator and an opening operation of the opening/closing valve are performed. The heat transfer fluid is moved to separate and store heat in a first heat storage tank as a cold heat source, and the concentrated liquid of the absorption solution is separated and stored in a second heat storage tank as an overflow heat source, while heat is stored in the second heat storage tank. said first to the exchanger
The fourth heat exchanger is characterized by a configuration in which a heat source for heating and evaporating the heat-resistant fluid in the heat storage tank is connected to take out the heat source from the fourth heat exchanger. In addition, the second invention is characterized by the structure of an absorption type heat exchanger that extracts a cold heat source, in contrast to the above-mentioned absorption type heat exchanger that extracts a hot heat source, and a fourth heat exchanger. The relationship between the heat source side and the usage side between the heat exchanger and the second heat exchanger is reversed, and the cooling heat source for cooling the absorption solution in the second volume heat tank is connected to the second heat exchanger.
It has a configuration in which a cold source can be taken out from the heat exchanger. The specific implementation of the device of the present invention having such characteristics will be described in detail below with reference to the accompanying drawings.The device of the present invention, as shown in Fig. 1, consists of a first heat storage tank 1 and a second heat storage tank 2. The main components are a separate heat storage tank, a piping path 3 that connects the gas phase portions of both heat storage tanks 192, and a refrigerator that can be switched to a heat storage cycle or a heat radiation cycle.

The first heat tank 1 (hereinafter abbreviated as the first tank 1) is constructed by sealing an appropriate amount of hot soot fluid, such as water, in a pressure-resistant tank 5 with a closed structure so that a gas phase exists in the upper layer. The first heat exchanger 6 (
(hereinafter abbreviated as the first coil 6) and the second heat exchanger 7 (hereinafter referred to as the first coil 6)
A second coil 7 (hereinafter abbreviated as second coil 7) is installed horizontally so as to be able to exchange heat with the water.

On the other hand, the second heat storage tank 2 (hereinafter referred to as the second tank 2) is a pressure-resistant tank 8 which also has a sealed structure, and contains an appropriate amount of an absorption solution such as a concentrated lithium bromide solution so that the upper layer is always in the gas phase. The third heat exchanger 9 is further enclosed in the absorption solution.
(hereinafter abbreviated as the third coil 9) and the fourth heat exchanger 1
0 (hereinafter abbreviated as the fourth coil 10) is installed horizontally so as to be able to exchange heat with the absorption solution.

Although water is generally used as the heat transfer fluid, various fluids may be used as long as they are capable of evaporating and condensing under a certain pressure to undergo a so-called gas-liquid phase change, and the absorption solution does not undergo chemical changes. is available.

Furthermore, ``absorption solutions are not limited to IJ tium bromide solution, but also various solutions that generate absorption heat when absorbed and diluted with hot soot fluid, such as CaC, ZnC, HgC, etc.
, MgBr2, NaOH, glycerin, LiC, sugar, etc. can be used.

The example shown in the first figure is an example of a device for storing thermal heat according to the first invention, and the second coil 7 includes a large intestine preheater 20 and piping installed in an outdoor sunlight irradiated place. On the other hand, the 4th coil is connected to the heat dissipation coil of the air conditioner installed in the castle to be heated by piping to circulate the water. .

Next, the pipe line 3 has an on-off valve 11 interposed in the middle of the pipe, and the valve 11 is opened or closed as required.

On the other hand, in this example, the refrigerator 4 includes a first coil 6, a third coil 9, a compressor 12, a four-way switching valve 13, a heat-absorbing air coil 14, a three-way valve 15, expansion valves 16 and 17, and a check valve. It is equipped with a valve 18 and can switch the operation between a heat storage cycle and a heat radiation cycle. During the heat storage cycle, the four-way selector valve 13 is operated to the valve position shown, and the compressor 12 → the third coil 9 is moved as shown by the solid line arrow. → Expansion valve 16 → Three-way valve 15 → First
The medium flows from the coil 6 to the compressor 12, and the third coil 9 acts as a heating condenser and the first coil 6 acts as a heat-absorbing evaporator. Also, during the heat dissipation cycle, the four-way switching valve 1
3, as shown by the broken line arrow, compressor 12 → first coil 6 → three-way valve 15 → expansion valve 17 → air coil 1
4→The refrigerant is circulated through the compressor 12, and so-called heat pump operation is performed using the first coil 6 as a heating condenser and the air coil 14 as a heat-absorbing evaporator.

The operating mode of the heat generating device having the above configuration will be described below. First, in the case of heat storage operation using late-night special electric power, the on-off valve 11 is opened and the refrigerator 4 is operated in a heat storage cycle. By heating the absorption solution in the second tank 2 to, for example, 5000 ℃ by the third coil 9, the hot soot fluid contained in the absorption solution is evaporated and the absorption solution is concentrated from 55% to 65%, for example. In the first tank 1, the hot soot fluid, such as water vapor, flowing from the second tank 2 through the piping 3 is cooled by the first coil 6 with cold soot of, for example, 3 to 7°C. It is condensed and liquefied in 1 tank 1. By performing this operation for a predetermined period of time, the heat transfer fluid is stored in the first tank 1 as a low-temperature liquid, while in the second tank 2 it is stored as an absorbent concentrated solution.

After this heat storage operation is completed, the on-off valve 11 is closed to stop the operation of the refrigerator 4, but through the above heat storage operation, the second coil 7
, the circulation of water in the fourth coil 10 is stopped. Next, in order to start the heat dissipation operation, that is, the heating operation, the on-off valve 11 is opened and the water in the second coil 7 and the fourth coil 10 is circulated. The solar heat is absorbed by the vessel 20 and heated by exchanging heat with the hot water in the second coil 7 which has reached a high temperature, so that it evaporates into water vapor and is sent into the second tank 2 via the piping line 3.

Since this water vapor is absorbed by the absorption concentrated solution in the second tank 2, the heat of condensation of the water vapor and the heat of absorption of the absorbent solution are the fourth
By exchanging heat with the water in the coil 10, the water is heated to about 40-45 pm.

Therefore, this hot water can be effectively used as heat source water for heating.

As is clear from the above explanation of both operations, the first
The water in the cassette 1 and the absorbed concentrated solution in the second cassette 2 are separated and stored, thereby effectively storing heat as a heating source during heating operation.

Note that if the heat collector 20 does not have sufficient capacity, the heat radiation cycle operation of the refrigerator 4 may be performed concurrently, and of course, the heat radiation cycle operation of the refrigerator 4 alone may be performed without using the heat collector 20.

Moreover, as a heat source, in addition to solar heat, a heat source with a low temperature of 15 to 60 oo may be used, such as outside air heat or factory E heat.

In the above-mentioned cage heating device, the second coil 7 in the first tank 1
The relationship between the heat source side and the user side of the fourth coil 10 in the second tank is reversed, and the fourth coil 10 is supplied with a cooling heat source such as water cooled by a cooling tower, river water, or low-pressure cold soot from another refrigerator. and the fourth coil 10 serves as a heat source side heat exchanger,
The second coil 7 forms a water circulation flow path with the indoor heat exchanger, thereby cooling the absorption solution in the second tank 2 and increasing the water vapor absorption capacity. By promoting evaporation within the coil 1, cold water can be taken out from the second coil 7, and cooling operation using this as a cooling heat source becomes possible.

The device in this case corresponds to the absorption type heat storage device according to the second invention. Therefore, in the above device, the first tank 1 and the second tank 2 are arranged in parallel in rows as shown in the second figure, and the walls facing each other have a heat insulating structure to prevent thermal interference. Both gas phase parts are connected to each other by a pipe 3 via an on-off valve 11 to form an integral structure, and as shown in FIG. , 21, the heat-insulating store 20 can be used as a cold store, and the heat-insulating store 21 can be used as a heat-retaining store.

In this case, as shown in Figure 2 A to 2, if the refrigerator 4 is operated using late-night electricity to cool the water in the first pot 1 and heat the absorption solution in the second pot 2. (See Figure 2 A)
Water is stored in the first tank 1 and absorbed concentrated liquid is stored in the second tank 2, thereby creating a heat storage state (see Figure 2).

Insulated storage 28; when operating the umbrella 1 during the day, open the opening/closing valve 1 and the state changes from the evening state shown in Fig. 2 to the state shown in Fig. 3, keeping it cool until the water in the first cage 1 is completely evaporated. and heat retention can be continued at the same time.

Next, in order to clarify that the device of the present invention is suitable as a practical device, we will set specific conditions and add an explanation. The cooling capacity is 8,000 Kca, which is equivalent to 3 horsepower.
Heat the L and old R liquid in tank 2 to 50o0 and reduce it from 55% to 6
When concentrated to 5%, the pressure in the second pot 2 is 12 feet Hg.
If the temperature is specified as , the generated water vapor temperature will be 1300.

The liquid heating capacity in No. 2 Kasshiba using late-night electricity is 11,000 yen.
Kca menotai x group i55,000KCa LIBN liquid (
The latent heat of vaporization at 60% concentration and 50oC is 722-68=
654 Kca Sonok9 Therefore, the amount of evaporated water in the second pot 2 is 55 000 ÷ 654 kg, and if the initial LiBr liquid amount in the second pot 2 is x,
Since the formula of winter hemorrhoids 53Q65 holds, ×ko546k
g (320〆)" Therefore, the volume of the second tank 2 should be about 0.4.

On the other hand, Kasugame No. 1 also states, ``The cooling capacity required to cool and liquefy the water vapor evaporated in No. 2 No. 2 is 84k9 x
590Kca Kunohaku 49,600Kca On the other hand, the cooling capacity of the refrigerator mother is 8,00Kca Menoday, so 436
00 no 5-8, OQO ± 29 00 female ca meno day auxiliary cooling mechanism is required.

The first tank's ribbon needs only to be able to store 1 kg of water, so it is approximately Q. One ship is enough.

Next, to explain the case of heating operation, the first kasugi with a water temperature of 8℃ is heated with an appropriate heat source, while the second danko is made to absorb the water evaporated by the first kasuki. The total absorption capacity in 2, that is, the capacity when all of the water in the chick k9 is evaporated, is ``Shigami kg x 65 cycles cam k9E 55,000 Kca〆.

The temperature of the LIBr solution in the second chamber 2 is about 50 oo, and the temperature of the hot water taken out is within the range of 40 to 50 oo.

On the other hand, if the first chamber 1 is heated from 8℃ to 5000℃ by an appropriate heat source before opening the on-off valve 11, then ``Water vapor pressure: 93 side Hg Latent heat of condensation: 733-83 = 650Kca so/Kg Total capacity: 650 x 84 = 54 600 Kca. Each value is obtained.

Here, if the heating rate of the first rice cake blade and the absorption rate of the second rice cake 2 are fast, but on the other hand, if the hot water extraction is warm or slow, then theoretically
The internal LIBr solution rises to a maximum of 9300.

Therefore, it is also possible to take out hot water at a relatively high temperature, for example, 80 to 8,500 ℃.

In addition, ``In a conventional heat storage tank that uses only the sensible heat of water, the heating capacity is 55,000 Kca, and if the key heat is used (△T) 1500 to store the heat, then ~ 55,00 Kca is used.
Zeno 5qCxIKca and/evening/OC)≠3,700
〆=3,7 later.

As is clear from the above figures, the volume of both heat storage tanks 92 is approximately one-eighth of that of a conventional heat storage tank that utilizes the sensible heat change of water, and the effect of miniaturization is extremely large. Even if the source temperature is low, a sufficiently large heating capacity can be obtained.

Since the present invention has the above-mentioned configuration, the external size of the heat storage tank is significantly small, which reduces the cost of the device.It also makes it possible to store heat at room temperature, and eliminates the need for a strictly insulated heat tank. It is extremely simple, and there is no heat loss even if it is left alone for a long time, and the heat storage efficiency is extremely high.

Moreover, since the present invention can utilize low-temperature heat sources, it is possible to use solar heat, exhaust heat, and outside air heat as heat sources.
In the case of air conditioning, it is possible to use a cooling heat source with a relatively high temperature level, such as water from a cooling tower, so it is a good energy-saving device, and hot water around 8 G can be taken out.

As described above, the present invention has various excellent effects and has great practical value. Furthermore, running costs can be further reduced by using late-night special electricity, making it a truly useful heat storage device.

[Brief explanation of the drawing]

FIG. 1 is a device circuit diagram related to an example of the device of the present invention, FIGS. FIG. 2 is a schematic structural diagram of a cold storage/warm storage device using the illustrated heat storage tank. 1...First heat storage tank, 2...Second heat storage tank, 3
...Pipe line, 4...Refrigerating machine, 6...
...First heat exchanger, 7...Second heat exchanger, 9
...Third heat exchanger, 10...Fourth heat exchanger, 11...Opening/closing valve, 12...Compressor,
13... Four-way cut fusuma valve. Many hair illustrations

Claims (1)

[Claims] 1. A heating medium fluid such as water capable of changing gas and liquid phases is contained, and a first heat exchanger 6 and a second heat exchanger 7 are built in the liquid phase of the heating medium fluid. A first heat storage tank 1 having a closed structure contains an absorption solution such as a lithium bromide solution that generates absorption heat when absorbing and diluting the heat transfer fluid, and contains a third heat storage tank in the absorption solution.
An on-off valve 11 is provided in a conduit that communicates between the gas phase portions of the second heat storage tank 1 and the second heat storage tank 2, which have a sealed structure and have a built-in heat exchanger 9 and a fourth heat exchanger 10. It consists of a refrigerator 4 formed in a refrigerant circulation circuit including an interposed piping line 3, a first heat exchanger 6, a third heat exchanger 9, and a compressor 12. The heat storage cycle operation of the refrigerator 4, in which the heat exchanger 9 acts as a condenser, and the opening operation of the on-off valve 11 are linked, and the heat medium fluid is used as a cold heat source.
In the heat storage tank 1, a second
While storing heat by separating and storing it in the heat storage tank 2, a heating source for heating and evaporating the heat medium fluid in the first heat storage tank 1 is connected to the second heat exchanger 7. 4. An absorption type heat storage device characterized in that a heat source can be taken out from a heat exchanger 10. 2. A first heat storage device having a sealed structure that accommodates a heat medium fluid such as water that can change gas/liquid phase, and has a first heat exchanger 6 and a second heat exchanger 7 built in the liquid phase of the heat medium fluid. A tank 1 contains an absorption solution such as a lithium bromide solution that generates absorption heat when absorbing and diluting the heat transfer fluid, and a third heat exchanger 9 and a fourth heat exchanger 10 are built in the absorption solution. a second heat storage tank 2 having a sealed structure, and a piping line 3 in which an on-off valve 11 is interposed in a pipe line that communicates between the gas phase portions of the first heat storage tank 1 and the second heat storage tank 2; , consists of a refrigerator 4 formed into a refrigerant circulation circuit including a first heat exchanger 6, a third heat exchanger 9, and a compressor 12, where the first heat exchanger 6 is an evaporator and the third heat exchanger 9 is a condenser. By interlocking the heat storage cycle operation of the refrigerator 4 and the opening operation of the on-off valve 11, the heat transfer fluid is used as a cold source in the first heat storage tank 1, and the second heat storage tank is used as a heat source for the absorption solution. While storing heat by separating and storing it in the heat storage tank 2, a cooling heat source for cooling the absorption solution in the second heat storage tank 2 is connected to the fourth heat exchanger 10, and the second
An absorption type heat storage device characterized in that a cold heat source can be taken out from a heat exchanger 7.