JP2000111286A - Cold heat storage device and cold heat storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient cold heat storage device with a wide range of a utilization field. SOLUTION: A cold storage tank 2 filled with a cold storage material and a heat storage tank 3 filled with a heat storage material are provided to store heat in a condenser side and cool heat in an evaporator side by a heat pump system. The heat transfer of the cold storage material or the heat storage material is carried out through a heat transfer medium, so that heat can be efficiently transferred in the cold storage tank 2 and the heat storage tank 3. A cold water circuit 5 and a hot water circuit 6 of a secondary side provided in the cold storage tank 2 and the heat storage tank 3 are suitably selected, so that a heat storage device is utilized in a variety of fields such as cooling, dehumidification and heating as well as the supply of cold and hot water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage / cooling apparatus using a latent heat storage material for supplying cold water and hot water to a relatively small room such as a kitchen, a toilet, a dressing room, a bathroom, and the like.

[0002]

2. Description of the Related Art Conventionally, this type of heat storage / cooling device is generally proposed as a heat storage device and a cooling device using a latent heat type heat storage material, respectively, mainly for business use. Due to the national demand to eliminate and equalize the gap between the supply and demand peaks of energy (electricity, gas, etc.) and to promote energy saving to prevent global warming, Using latent heat type heat storage material,
For example, a method has been put to practical use in which heat is stored as warm water at night using electric power at midnight, or ice is made and stored in cold water to use it during daytime.

Sodium thiosulfate hexahydrate (melting point 48 ° C.), sodium acetate trihydrate (melting point 58 ° C.) is used as a heat storage material for heat storage, and water (melting point 0) is used as a heat storage material for cold storage.
° C) has been used and some have been put to practical use. As a heat transfer configuration between the heat storage material and the secondary side, a system in which a secondary side heat exchanger is embedded in the heat storage material is generally adopted.

[0004]

However, in the above-mentioned conventional heat storage / cooling device, the secondary heat exchanger is embedded in the heat storage material, so that the heat storage material is placed on the surface of the heat exchanger during heat exchange. Has a problem that even if heat is stored once, the heat storage material has a high heat transfer coefficient, and that all the heat cannot be used effectively because the heat storage material has low thermal conductivity. .

[0005] For this reason, as a general household storage / cooling device, only a hot water storage device (electric water heater, petroleum water heater, etc.) has been used, and the cold storage device has not been put to practical use.

[0006]

In order to solve the above-mentioned problems, the present invention provides a latent heat type heat storage material inside a container, which is almost incompatible with the heat storage material, becomes gas when absorbing heat, and becomes liquid when releasing heat. And a heat exchanger for taking out the heat of the latent heat type heat storage material is disposed in the space portion, so that the heat released by the latent heat type heat storage material is Since the heat transfer medium is transmitted to the heat exchanger provided in the space, the latent heat type heat storage material can be prevented from attaching around the heat exchanger provided in the space, and heat can be taken out with high efficiency.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A cold storage device according to the present invention has a latent heat type cold storage material having a melting point in the range of 0 ° C. to 20 ° C., and is substantially incompatible with the latent heat type cold storage material. The regenerator has a heat storage medium A, which becomes a gas at the time of heat absorption and becomes a liquid at the time of heat release, leaving a space above it, and has a melting point in the range of 30 ° C. to 80 ° C. A latent heat type heat storage material, and a heat transfer medium B which is almost incompatible with the latent heat type heat storage material, becomes a gas when absorbing heat, and becomes a liquid when releasing heat, are sealed with a space above the space. It is composed of a heat storage tank, an evaporator provided from the space portion of the cold storage tank to the latent heat type cold storage material filling section, a condenser provided in the latent heat type heat storage material of the heat storage tank, a compressor, and an expansion valve. A heat pump circuit, provided in the latent heat type cold storage material of the cold storage tank; And cooling passages, comprising a secondary side circuit consisting of the heating passage provided over the space from the latent heat storage material filling unit of the heat storage tank.

The heat pump pumps the heat of the regenerator to the regenerator so that both the regenerative energy and the regenerative energy can be used, and the heat transfer medium mediates the heat stored in the regenerator material and the regenerator material for heat exchange. Since the power is transmitted to the heat storage, a highly efficient and practical storage / cooling device can be provided.

[0009] A regenerative element having an inlet / outlet water pipe and enclosing a latent heat type regenerative material having a melting point in the range of 0 ° C to 20 ° C, and an evaporator are disposed inside. Storage device having a cold storage tank, an inlet / outlet water pipe, a latent heat storage material having a melting point in the range of 30 ° C. to 80 ° C., and a condenser disposed therein. A heat pump circuit including an evaporator provided inside the cold storage tank and a condenser provided inside the heat storage tank,
It comprises a secondary circuit comprising a cooler provided in the cold storage tank and a heater provided at least in the space of the heat storage tank.

[0010] Here. Since the cool storage element and heat storage element are arranged in the form of a container in each cool storage tank and heat storage tank, it is possible to manufacture the cool storage / cool heat element in large quantities at low cost and to design the pressure resistance of the cool storage / cool heat tank. Can be made easier, so that the practicality can be further improved.

[0011] Further, the heat storage / cooling element of the present invention is substantially incompatible with the latent heat type heat storage material, the supercooling inhibitor, and the latent heat type heat storage material in a metal cylindrical container, A heat transfer medium that becomes a gas when absorbing heat and becomes a liquid when releasing heat,
The heat transfer promoting material is sealed in such a manner that a space is left above.

As a specific heat storage element, sodium acetate trihydrate is used as a latent heat type heat storage material, and hydrofluoroether is used as a heat transfer medium.

When the metal container is a cylindrical container, a mass production method can be applied, and mass production can be performed at low cost.

[0014]

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

(Embodiment 1) FIG. 1 is a schematic sectional view showing the construction of Embodiment 1 of a storage / cooling apparatus according to the present invention. The heat storage / cooling device 1 includes a cold storage tank 2, a heat storage tank 3, and a heat pump circuit 4.
And a cold water circuit 5 on the secondary side and a hot water circuit 6 on the secondary side. Inside the cold storage tank 2, water is used as the latent heat type cold storage material 7,
As the heat transfer medium A8, butane (a gas state is indicated by 、 and a liquid state is indicated by ●) is sealed while leaving the space 9 at the top (air is degassed). The evaporator 11 of the heat pump circuit 4 extends from the space 9 to the cold storage material filling section 10.
However, a cooler 12 of a chilled water circuit is provided in the cool storage material charging section 10 in thermal contact with the evaporator 11.

In the heat storage tank 3, sodium acetate trihydrate (melting point 58 ° C.) is used as the latent heat type cold storage material 13 and hydrofluoroether (HFE-7100, manufactured by Sumitomo 3M Limited, boiling point 60 ° C.) is used as the heat transfer medium B14. , The gas state is indicated by ○, and the liquid state is indicated by ●), which is sealed (the air is degassed) leaving the space 15 at the top. The condenser 17 of the heat pump circuit 4 is provided in the heat storage material filling section 16.
However, a heater 18 of the secondary side hot water circuit is provided in thermal contact with the condenser 17 from the inside of the heat storage material filling section 16 to the heat storage tank space 15. 19 is a compressor of the heat pump circuit 4, and 20 is an expansion valve.

Next, the operation and operation will be described. Cold storage and heat storage are performed by operating the compressor 19 of the heat pump circuit 4. The butane 8 receives the sensible heat and latent heat of the water 7 in the cool storage tank 2, evaporates, and reaches the cool storage tank space 9. Then, heat is radiated and condensed by the evaporator 11 to become a liquid and returns to the water 7 again. Then, heat is received again from the water 7. The circulation of butane 8 allows the sensible heat and latent heat of water 7 to be removed from evaporator 1.
Pump by one. As a result, the water 7 becomes ice and cools. On the other hand, in the heat storage tank 3, the sodium acetate trihydrate 13 and the hydrofluoroether 14 are heated by the condenser 17 of the heat pump circuit 4, and at 58 ° C. or higher, the sodium acetate trihydrate 13 is converted from a solid to a liquid as latent heat of fusion. And store heat. In the above operation process, the heat pump operation is a steady operation at 0 ° C. and 60 ° C., and the control can be simplified.

With the cold storage and heat storage, cold water can be taken out by passing a secondary medium (water or antifreeze) through the cooler 12 of the cold storage tank 2. Further, by passing the solution through the heater 18 of the heat storage tank 3, it can be taken out as hot water. When heat is taken out by the evaporator 11 in the cool storage tank 2 and the heater 18 in the heat storage tank 3, the water 7 and the sodium acetate trihydrate 13 are agitated by the heat transfer medium in both tanks, and are usually generated. Phase separation and supercooling phenomenon can be prevented. Further, even during storage and cold heat, since the cooler 12 and the evaporator 11 are in thermal contact with the heater 18 and the condenser 17,
Can be taken out as hot water.

Thus, for example, cold storage and heat storage can be performed overnight using electric power at midnight, and cold water and hot water can be taken out at high output during intermediate use. Cold water can be used as it is or for cooling and dehumidification, and hot water can be used as it is or as heating.

(Embodiment 2) FIG. 2 is a schematic sectional view of Embodiment 2 of a storage / cooling device according to the present invention. In this embodiment,
The difference from the first embodiment is that the cold storage material 7 and the heat storage material 13 are filled inside,
That is, it is provided in the cold storage tank 2 and the heat storage tank 3.
The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

According to the configuration of the second embodiment, a large number of cold storage elements and heat storage elements can be manufactured at low cost. Further, by changing the size of the cold storage tank 2 and the heat storage tank 3 and increasing or decreasing the number of the cold storage elements or the heat storage elements installed therein, the specifications of the respective abilities can be easily changed.

(Embodiment 3) FIG. 3 is a schematic sectional view of a storage / cooling element according to Embodiment 3 of the present invention. A container 31 made of a metal such as iron or aluminum is filled with contents having the same composition as in the first embodiment. 32 is a latent heat type heat storage material, 33 is a heat transfer medium, and 34 is a heat transfer promoting material such as silicon carbide, boron oxide or carbon black. It can be mass-produced inexpensively by applying the can-making technology such as drinking water. Needless to say, this can be used in the second embodiment.

Further, it is more effective to provide irregularities and folds so as to increase the heat transfer area outside the metal container.

If sodium acetate trihydrate is used as the latent heat storage material and hydrofluoroether is used as the heat transfer medium, an optimum heat storage element can be provided.

In each of the above embodiments, the cold storage material is water and the heat storage material is sodium acetate trihydrate. However, the present invention is not limited to this. Sodium sulfate 1 as cold storage material
Double salts such as 0 hydrate, sodium chloride 6 hydrate, and urea, and sodium thiosulfate pentahydrate, paraffin, etc. may be used as the heat storage material.

[0026]

As described above, since the heat transfer medium is interposed in the cold storage material or the heat storage material, the heat transfer response is good, and the cold storage and heat storage can be performed promptly.

Further, since a cool storage tank and a heat storage tank are provided and cold storage and heat storage are performed using a heat pump, cold storage and heat storage can be performed efficiently.

By appropriately selecting the secondary side, it is possible to provide a storage / cooling apparatus having a wide range of applications, such as cooling, dehumidifying, and heating, as well as supplying cold and hot water.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a storage / cooling device according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a storage / cooling device according to a second embodiment of the present invention.

FIG. 3 is a schematic sectional view of a storage / cooling element according to a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 2 cold storage tank 3 heat storage tank 4 heat pump circuit 7 latent heat type cold storage material 8 heat transfer medium A 13 latent heat type heat storage material 14 heat transfer medium B 20 cold storage element 21 heat storage element

Claims (4)

[Claims] 1. A latent heat type cold storage material having a melting point in the range of 0 ° C. to 20 ° C., substantially incompatible with said latent heat type cold storage material, becoming a gas at the time of heat absorption, and A regenerative storage tank in which a liquid heat transfer medium A is enclosed leaving a space above, a latent heat type heat storage material having a melting point in the range of 30 ° C. to 80 ° C., and the latent heat type heat storage material Are almost incompatible with
A heat storage tank in which a heat transfer medium B that becomes a liquid at the time of heat release is sealed leaving a space above, an evaporator provided from a space of the cool storage tank to a latent heat type cold storage material charging section, A heat pump circuit comprising a condenser, a compressor, and an expansion valve provided in the latent heat type heat storage material of the tank;
A storage circuit comprising: a cooling passage provided in a latent heat type cold storage material of the cool storage tank; and a secondary circuit including a heating passage provided from a latent heat type heat storage material filling portion of the heat storage tank to a space portion.
Cooling equipment. 2. A cooling water inlet / outlet pipe having a temperature of 0.degree.
A regenerator element enclosing a latent heat type regenerator material having a melting point in the range of ℃, a regenerator tank having an evaporator disposed therein, and an inlet / outlet water pipe, and having an internal temperature of 30 ° C to 80 ° C. A heat storage element in which a latent heat type heat storage material having a melting point in the range of ° C. is enclosed, and a heat storage tank in which a condenser is disposed, and an evaporator and a heat storage tank provided in the cold storage tank A heat pump circuit composed of a condenser provided inside,
A storage / cooling device comprising a cooler provided in the cool storage tank and a secondary circuit comprising a heater provided in at least a space portion of the heat storage tank. 3. A latent heat type heat storage material, a supercooling inhibitor, and almost incompatible with the latent heat type heat storage material, become a gas when absorbing heat, and become a liquid when releasing heat in a metal container. 3. The storage / cooling element according to claim 2, wherein a heat storage / cooling element is used in which the heat transfer medium and the heat transfer promoting material are sealed while leaving a space above. 4. The heat storage / cooling element according to claim 3, wherein a heat storage element using sodium acetate trihydrate as a latent heat type heat storage material and hydrofluoroether as a heat transfer medium is used.