JP3322514B2 - Heat storage device and its operation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage device for storing cold or hot water as a heat source for general air conditioning.

[0002]

2. Description of the Related Art Conventionally, cooling and heating is performed by circulating and supplying cold or hot water from a heat storage device to an air conditioner such as a fan coil unit or an air conditioner disposed in a building. An ice heat storage system that stores cold heat for cooling in the form of ice in a heat storage device is capable of storing a large amount of cold heat in a small scale.

[0003]

However, when cold water is supplied to an air conditioner using a conventional ice heat storage device, the latent heat release by melting ice and the heat source water itself in the heat storage tank are required in the heat storage tank. And the sensible heat release by raising the temperature of the sample. Then, in the conventional ice heat storage device, heat release is completed when the temperature of the heat source water in the heat storage tank reaches the outgoing temperature (generally, 7 ° C.) of the cooling water for air conditioning.

[0004] It is an object of the present invention to provide a heat storage means capable of releasing more cold heat by performing latent heat release and sensible heat release in a heat storage tank in a stepwise manner.

[0005]

According to the present invention, cold heat is generated.
The upper opening Kaemizu capable spit from other systems in the vicinity of the liquid surface of the heat source water stored in the heat storage tank during the sensible heat released from other systems when the latent heat releasing cold A heat storage device comprising: a nozzle capable of ejecting return water toward the inside of a heat storage tank; and a lower opening capable of sucking heat source water in the heat storage tank near a bottom of the heat storage tank. Is done.

Further, according to the present invention, a heat storage tank for storing heat source water, and a return water from another system , which is disposed near the liquid surface of the heat source water stored in the heat storage tank and releases sensible heat when chilling heat is released. Spit out
An upper opening through which the heat storage tank can be supplied, a lower opening disposed near the bottom of the heat storage tank, a first conduit for supplying return water from another system to the heat storage tank, A second pipe for discharging the heat source water to another system, a state in which the first pipe and the upper opening communicate with each other, and a state in which the second pipe and the lower opening communicate with each other; communicates the first conduit and a lower opening, into a state in which communication between the second conduit and the upper opening, and a switching means for selectively switching from other systems when the latent heat releasing cold And a nozzle capable of ejecting the return water from the heat storage tank toward the inside of the heat storage tank.

[0007] In these heat storage devices, it is preferable to attach a distributor for generating a temperature stratified flow around the upper opening and / or the lower opening.

Further, according to the present invention, there is provided an operation method for supplying cold water to another system using the heat storage device, wherein the heat source water in the heat storage tank is lower than a predetermined temperature, or Until the ice put in advance is melted, return water from other systems is blown out from the nozzle toward the inside of the heat storage tank, and heat source water sucked from the lower opening is discharged to other systems,
After the heat source water in the heat storage tank has reached a predetermined temperature or higher, or after the ice in the heat storage tank has melted, return water from other systems is discharged from the upper opening and the heat source sucked from the lower opening A method is provided for draining water to another system.

[0009]

When performing ice heat storage using the heat storage device of the present invention, first, ice is previously stored in the heat storage tank. In this case, ice produced by another heat source device can be supplied as return water into the heat storage tank, and the ice can be carried into the heat storage tank. Alternatively, ice may be generated in the heat storage tank by freezing water in the heat storage tank using a refrigerator or the like.

[0010] After the ice is previously contained in the heat storage tank, return water from another system is jetted from the nozzle toward the inside of the heat storage tank. Then, the ice is thawed by the flow of the return water jetted from the nozzle, and the latent heat is used to cool the heat source water in the heat storage tank into cold water. The cold water thus created is sucked through the lower opening near the bottom of the heat storage tank and discharged to another system.

Next, when all the ice in the heat storage tank is thawed and the release of latent heat is completed, the jet of return water from the nozzle is stopped.
Instead, the discharge of the return water from the upper opening is started near the liquid level of the heat source water in the heat storage tank. Thawing of all the ice in the heat storage tank can be detected, for example, by the fact that the temperature of the heat source water in the heat storage tank has risen to a predetermined temperature. In this way, the supply position of the return water from the other system is changed to above the tank, and while discharging the return water at a gentler flow rate than above the heat storage tank, the heat source water is sucked from the lower opening near the bottom of the heat storage tank. As described above, the return water is slowly supplied from above the heat storage tank, and the heat source water is sucked in from below, whereby a temperature stratified flow can be generated inside the heat storage tank, and the high-temperature water supplied from above the tank is supplied. When,
Without mixing the low-temperature side water remaining in the heat storage tank, only the cold water can be sucked in from the bottom of the tank and supplied to another system.

As described above, according to the present invention, the supply position of the return water is set to be inside the heat storage tank until the thawing is completed, and is changed to a position above the heat storage tank after the thawing is completed. The latent heat release and the sensible heat release in the tank can be performed in a stepwise manner. Thus, according to the present invention,
It is possible to supply cold water until all the heat source water in the heat storage tank rises to the temperature of return water supplied from another system, and it is possible to release more cold heat than conventional ice heat storage devices Become.

[0013]

Embodiments of the present invention will be described below. In FIG.
1 shows a system diagram of a heat storage device according to an embodiment of the present invention.

A heat source water 2 is contained in the heat storage tank 1. As the heat source water 2, water is generally used. Heat source water 2
A temperature sensor 3 for measuring the water temperature of the heat storage tank 1 is disposed on the side wall surface of the heat storage tank 1. A first pipeline A1 and a second pipeline A2 are connected to the heat storage tank 1. In the first pipeline A1,
A supply pump P1 for supplying return water from another system to the heat storage tank 1 is provided, and a discharge for discharging the heat source water 2 from the heat storage tank 1 to the other system is provided in the second pipe A2. A pump P2 is provided. The other system is, for example, an air conditioner that performs cooling and heating by the heat of the heat source water 2 in the heat storage tank 1 or a heat source device that causes the heat source water 2 in the heat storage tank 1 to store cold or warm heat.

The heat storage tank 1 is provided with an upper opening B1 arranged near the liquid surface of the heat source water 2 and a lower opening B2 arranged near the bottom of the heat storage tank 1. Also, the upper opening B1
A nozzle B3 capable of jetting return water from another system toward the inside of the heat storage tank 1 is provided below the nozzle.
A switching valve V5 provided in communication with the upper opening B1
By operating the switching valve V6 provided in communication with the nozzle B3, return water supplied from another system is discharged from the upper opening B1 at a slow flow rate as described later, Can be switched to a state in which return water is spouted vigorously toward the inside of the heat storage tank 1.

As shown in FIG. 2, when the return water from another system is supplied into the heat storage tank 1 around the upper opening B1,
A distributor 4 for generating a stratified temperature flow in the heat storage tank 1 is provided. The distributor 4 has an upper opening B
In this configuration, a weir 6 made of punched metal is erected on a plate 5 attached to the periphery of the plate 1. This distributor 4
When return water from another system is supplied into the heat storage tank 1 from the upper opening B1 by the action of the above, return water discharged from the upper opening B1 passes through the hole 7 formed in the weir 6. after,
The heat is supplied near the liquid level of the heat storage tank 1 at a slow flow rate. Conversely, when the heat source water 2 is discharged from the upper opening B1 to another system, the heat source water 2 in the heat storage tank 1 passes through the hole 7 formed in the weir 6 and then flows slowly. Is sucked into the upper opening B1 and discharged.

As shown in FIG. 3, a distributor 10 for generating a temperature stratified flow in the heat storage tank 1 is also provided around the lower opening B2. Distributor 10
Has a configuration in which a net 11 for separating ice, which is made of, for example, stainless steel, is mounted around the lower opening B2. As in the case of the upper opening B1 described above,
When the return water from another system is supplied into the heat storage tank 1 from the lower opening B2 by installing the distributor 10 in the lower opening B2, the return water discharged from the lower opening B2 is After passing through the gap 12 of the net 11, the heat is supplied near the bottom of the heat storage tank 1 at a slow flow rate. Conversely, when the heat source water 2 is discharged from the lower opening B2 to another system, the heat source water 2 in the heat storage tank 1 passes through the gap 12 of the net 11 and then flows at a lower flow rate. It is sucked into B2 and discharged.

The first pipe A1 has an upper opening B between the first pipe A1 and the second pipe A2 and the heat storage tank 1.
1 and the nozzle B3, the second conduit A2 is in communication with the lower opening B2, and the second conduit A2 is in communication with the upper opening B1, and the first conduit A1 is in the lower opening. A switching means 15 is provided for selectively switching to a state communicating with B2. The switching means 15 of the embodiment includes a first switching valve V1 disposed on the first conduit A1, a second switching valve V2 disposed on the second conduit A2, two bypasses W1 and The bypass W2 includes a third switching valve V3 and a fourth switching valve V4 disposed on the bypass W1 and the bypass W2. One end of the bypass W1 is connected to the first switching valve V1.
The other end opens to the first conduit A1 on the upstream side, and the other end opens to the second conduit A2 on the upstream side of the second switching valve V2. One end of the bypass W2 opens to the first pipeline A1 on the downstream side of the first switching valve V1,
The other end is open to the second conduit A2 downstream of the second switching valve V2.

Now, in the heat storage device of the embodiment having the above-described configuration, the following operation is performed as shown in Table 1.

[0020]

[Table 1]

[Ice making] When performing ice heat storage using the heat storage device, it is necessary to first make the heat storage tank 1 contain ice. When performing the ice making operation, the first pipeline A
The first and second pipes A2 are connected to another system, a heat source device. The heat source device in this case has a function of manufacturing ice. Then, in the switching means 15, the first switching valve V
The first and second switching valves V2 are opened, and the third switching valve V3 and the fourth switching valve V4 are closed. Further, the switching valve V5 provided in communication with the upper opening B1 is opened, and the switching valve V6 provided in communication with the nozzle B3 is closed, so that return water can be supplied to the upper opening B1 side. . As a result, the first pipeline A1 communicates with the upper opening B1, and the second pipeline P2 communicates with the lower opening B2. The ice produced by the heat source device is supplied to the first pipe A1 by the operation of the supply pump P1.
And ice is supplied into the heat storage tank 1 from the upper opening B1. Further, the heat source water 2 in the heat storage tank 1 is sucked from the lower opening B2 and transported through the second pipe A2 by the operation of the discharge pump P2, so that the heat source water 2 in the heat storage tank 1 is transferred to the heat source device. Supply. The heat source water 2 thus supplied to the heat source device is turned into ice, and is supplied again into the heat storage tank 1 from the upper opening B1 via the first conduit A1. In addition, you may make it generate ice in the heat storage tank 1 by freezing the heat source water 2 in the heat storage tank 1 using a refrigerator or the like. Then, when a sufficient amount of ice is stored in the heat storage tank 1, the ice making operation is terminated.

[Latent Heat Release] When cooling is supplied to the air conditioner with the ice stored in the heat storage tank 1, the first pipeline A1 and the second pipeline A2 are connected to another system. Connect to air conditioner. The switching valve V5 is closed, and the switching valve V6 is closed.
Is opened to communicate the first pipeline A1 with the nozzle B3.
Then, the return water from the air conditioner is conveyed through the first pipeline A1 by the operation of the supply pump P1, and is spouted vigorously toward the ice inside the heat storage tank 1 via the nozzle B3. Then, the ice is thawed by the flow of return water spouted from the nozzle B3, and the heat source water 2 in the heat storage tank 1 is cooled using the latent heat. In addition, the cold water thus produced is sucked from the lower opening B2 near the bottom of the heat storage tank 1, and the discharge pump P2
Is supplied through the second pipeline A2 to supply cold water to the air conditioner.

[Sensible Heat Release] Next, when all the ice in the heat storage tank 1 has been thawed and the release of the latent heat is completed, the switching valve V5 is opened again, the switching valve V6 is closed, and the first pipeline is opened. A1 communicates with the upper opening B1. Thus, the ejection of the return water from the nozzle B3 is stopped, and instead, the discharge of the return water from the upper opening B1 is started near the liquid level of the heat source water 2 in the heat storage tank 1. Thawing of all the ice in the heat storage tank 1 is detected, for example, because the temperature of the heat source water 2 measured by the temperature sensor 3 has risen to a predetermined temperature. For example, the temperature of general return water of an air conditioner is about 12 to 14 ° C. In this case, the temperature of the heat source water 2 in the heat storage tank 1 is about 7 ° C.
When the temperature reaches a certain level, all the ice will thaw.

The heat source water 2 is sucked from the lower opening B2 near the bottom of the heat storage tank 1 while discharging the return water at a slower flow rate than above the heat storage tank 1. As described above, since the distributor 4 is attached to the upper opening B1, the return water discharged from the upper opening B1 is supplied into the heat storage tank 1 at a slow flow rate near the liquid surface. You. As described above, the return water is slowly supplied from above the heat storage tank 1 and the heat source water 2 is sucked from below, so that a temperature stratified flow can be generated inside the heat storage tank 1. Thus, without mixing the high-temperature side water supplied from above the heat storage tank 1 and the low-temperature side water remaining in the heat storage tank 1, only the cold water is sucked through the lower opening B2 at the bottom of the tank, and the air conditioning is performed. It can be supplied to the device.

[Hot water heat storage] Next, when performing hot water heat storage using a heat storage device, the first pipe A1 and the second pipe A2
Is connected to another system, a heat source device. The heat source device in this case has a function of producing hot water. Then, in the switching means 15, the first switching valve V1 and the second switching valve V2 are opened, and the third switching valve V3 and the fourth switching valve V3 are opened.
4 is closed, and the switching valve V5 is switched to supply the return water to the upper opening B1 side. As a result, the first pipeline A1 communicates with the upper opening B1, and the second pipeline P2 communicates with the lower opening B2. Then, the hot water produced by the heat source device is supplied to the first pipe A1 by the operation of the supply pump P1.
And hot water is supplied into the heat storage tank 1 from the upper opening B1. Further, the heat source water 2 in the heat storage tank 1 is transferred to the lower opening B2.
Then, the heat source water 2 in the heat storage tank 1 is supplied to the heat source device by being sucked in from the tank and conveyed through the second pipe A2 by the operation of the discharge pump P2. The heat source water 2 thus supplied to the heat source device is turned into hot water, and is again supplied from the upper opening B1 into the heat storage tank 1 through the first conduit A1. Note that the heat source water 2 may be heated in the heat storage tank 1 using a heater or the like to generate hot water in the heat storage tank 1. And
When a sufficient amount of hot water is stored in the heat storage tank 1, the hot water heat storage ends.

[Heat Release] When hot water is supplied to the air conditioner with the hot water stored in the heat storage tank 1 as described above,
The first pipe A1 and the second pipe A2 are connected to an air conditioner which is another system. Then, in the switching means 15, the first switching valve V1 and the second switching valve V2 are closed, and the third switching valve V3 and the fourth switching valve V4 are opened. As a result, the first pipeline A1 communicates with the lower opening B2, and the second pipeline P2 communicates with the upper opening B1. Then, the return water from the air conditioner is conveyed through the first pipeline A1 by the operation of the supply pump P1, and the return water is discharged from the lower opening B2 near the bottom of the heat source water 2 in the heat storage tank 1. To start. In addition, the hot water stored in the heat storage tank 1 is sucked from the upper opening B1 in the vicinity of the liquid level of the heat storage tank 1, and is conveyed through the second pipe A2 by operating the discharge pump P2.
Supply hot water to the air conditioner.

As described above, since the distributor 10 is also attached to the lower opening B2, the return water discharged from the lower opening B2 stores heat at a slow flow rate near the bottom of the heat storage tank 1. It is supplied into the tank 1. As described above, the return water is slowly supplied from below the heat storage tank 1 and the heat source water 2 is sucked from above, whereby a stratified temperature flow can be generated inside the heat storage tank 1.
Thus, without mixing the low-temperature side water supplied from below the heat storage tank 1 and the high-temperature side hot water stored in the heat storage tank 1, only the hot water is sucked in from the upper opening B1 to the air conditioner. It becomes possible to supply.

As described above, in this heat storage device, the supply position of the return water from the air conditioner is set to the nozzle B3 inside the heat storage tank 1 until the melting of the ice is completed, and the melting of the ice is completed. Thereafter, by changing to the upper opening B1 above the heat storage tank 1, the latent heat release and the sensible heat release in the heat storage tank 1 can be performed stepwise. Therefore, according to this heat storage device, it becomes possible to supply cold water until all of the heat source water 2 in the heat storage tank 1 rises to the temperature of the return water supplied from the air conditioner.

Here, ice filling rate = 30 (wt%), specific gravity of water =
1.0, the use temperature of the cold water for air conditioning is the outgoing water temperature = 7
Assuming that the temperature of the return water is 14 (° C.), the effective utilization ratio of the cool heat calculated in the heat storage device according to the present invention is as follows per 1 m ^{3 of} the water tank, as compared with the conventional heat storage device. Cold extractable amount of conventional heat storage device = 80 (Kcal / kg) × 0.3 + (7-0) (deg) = 31 (Kcal / kg) = 31 (Mcal / m 3) the present invention the thermal storage cold extraction possible Amount = 80 (Kcal / kg) × 0.3 + (14-0) (deg) = 38 (Mcal / m ³ ) Effective use of cold energy of the heat storage device of the present invention = 38/31 = 1.226, and the use ratio is 22 .6 (%) increase.

[0030]

According to the present invention, when the ice is thawed, the cold heat is released in two stages of the latent heat release and the sensible heat release, whereby the cold heat of the heat storage tank can be effectively taken out. The heat storage device of the present invention can also be used as a water heat storage tank.

Further, the heat storage device of the present invention can perform ice heat storage in cooling demand and hot water heat storage in heating demand in the same device. Therefore, the heat storage device of the present invention can be used throughout the year and is economical.

[Brief description of the drawings]

FIG. 1 is a system diagram of a heat storage device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of an upper opening.

FIG. 3 is an enlarged view of a lower opening.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat storage tank 2 Heat source water 15 Switching means B1 Upper opening B3 Nozzle B2 Lower opening

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-110332 (JP, A) JP-A-3-211334 (JP, A) JP-A-3-89330 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) F24F 5/00 102 F28D 20/00

Claims (5)

(57) [Claims] 1. An upper opening capable of discharging return water from another system near a liquid surface of a heat source water stored in a heat storage tank when chilled heat is released by sensible heat; <br/> other from the system and the nozzle capable of ejecting toward the interior of the heat storage tank Kaemizu the heat source water can be drawn a lower opening in the heat storage tank near the bottom of the heat storage tank when Heat storage device comprising: 2. A heat storage tank for storing heat source water, disposed on the liquid surface near the heat source water stored in the heat storage tank, cold
Spouting return water from other systems when releasing heat sensibly
An upper opening, which can be connected to the heat storage tank, a lower opening disposed near the bottom of the heat storage tank, a first conduit for supplying return water from another system to the heat storage tank, and a heat source water from the heat storage tank A second conduit for discharging the gas to another system, a state in which the first conduit communicates with the upper opening, and a state in which the second conduit communicates with the lower opening, A switching means for selectively switching between a state in which the pipe and the lower opening are in communication and a state in which the second pipe and the upper opening are in communication; and a means for returning from the other system when the cold heat is released from the latent heat. A nozzle capable of jetting water toward the inside of the heat storage tank. 3. The heat storage device according to claim 1, wherein a distributor for generating a temperature stratified flow is mounted around the upper opening and / or the lower opening. 4. In the vicinity of the liquid level of the heat source water stored in the heat storage tank.
Upper opening that can discharge return water from other systems
And return water from other systems squirt into the heat storage tank
Nozzle and a heat storage tank near the bottom
The lower opening that can suck in the heat source water in the heat storage tank
An operation method for supplying cold water to another system using the provided heat storage device, wherein while the heat source water in the heat storage tank is lower than a predetermined temperature, return water from the other system is supplied from the nozzle to the heat storage tank through the nozzle. The heat source water blows out toward the inside, and the heat source water sucked in from the lower opening is discharged to another system.After the heat source water in the heat storage tank reaches a predetermined temperature or higher, the return water from the other system is raised. A method that discharges heat source water from the lower opening into the other system while discharging from the opening. 5. The method according to claim 5, wherein the heat source water stored in the heat storage tank is in the vicinity of a liquid surface.
Upper opening that can discharge return water from other systems
And return water from other systems squirt into the heat storage tank
Nozzle and a heat storage tank near the bottom
The lower opening that can suck in the heat source water in the heat storage tank
This is an operation method for supplying cold water to another system by using the provided heat storage device, and stores the return water from the other system through the nozzle until the ice previously stored in the heat storage tank melts. While squirting toward the inside of the tank, the heat source water sucked from the lower opening is discharged to another system, and after the ice has melted, return water from the other system is discharged from the upper opening and the lower opening A method of discharging heat source water sucked from the section to other systems.