JPS6064192A - Heat accumulating device - Google Patents

Abstract

PURPOSE:To increase heat accumulating efficiency by a constitution wherein heat accumulating materials, having lower melting points, are arranged sequantially around the central heat accumulating material of high melting point, heat transfer tubes equipped with needle-like fins are utilized as heat medium tubes and a space between the needle-like fins is filled with the heat accumulating material. CONSTITUTION:Heat accumulating chambers 4, 5, 6 are arranged so that a vessel 1 accommodates a latent heat accumulating material, respective heat accumulating materials are partitioned by tubular partitioning walls 2, 3 and the heat accumulating materials having lower melting points are accomodated sequentially around the central latent heat accumulating material of high melting point. The outer surfaces of respective heat transfer tubes 7 are formed with the needle-like fins 8 and heat is given or received between the heat accumulating materials and the heat transfer tubes through the needls-like fins 8. In case the heat is accumulated by utilizing the heat medium heated by a heat source 17, a controller 6 compares the temperature of the heat medium with the temperatures of respective heat accumulating chambers 4, 5, 6 and controls a four-way valve 15 and solenoid valves V1, V7 so that the heat medium flows thereinto from the side of the high-temperature heat accumulating material 4 and flows to the side of the low-temperature heat accumulating material 6 sequentially when the temperature of the heat medium is hihg. According to this method, smooth heat dissipation and efficient heat accumulation may be effected.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a heat storage device in which a plurality of latent heat storage materials having different melting points are separately housed.

(b) Prior art A device that stores heat by using a substance with a melting point of several tens of degrees to 200 degrees Celsius, such as benzene, paraffin, or inorganic hydrated salt, as a heat storage amount (referred to as a latent heat storage material) is capable of storing and dissipating heat. Because it utilizes the latent heat of fusion of the substance in the process, it has the advantage of storing a large amount of heat per unit weight, and has been used as a heat storage material that allows devices to be made smaller.

However, such latent heat storage materials generally have poor thermal conductivity, so they have the drawback that it is difficult to rapidly introduce or remove heat.

For this reason, it has been considered to compensate for the poor thermal conductivity of the latent heat storage material by incorporating a heat conductive member with a higher thermal conductivity than the heat storage material into the heat storage material. Mixing of the heat conductive members causes uneven mixing of the heat conductive members, and in the relationship between the heat storage material and the heating medium that transfers heat, it is difficult to mix the heat conductive members in such a way that rapid heat transfer occurs. was not yet reached.

(c) Purpose of the invention In view of the above points, the present invention provides a device with high heat storage efficiency by using a plurality of types of latent heat storage materials, and a heat storage device connected to this heat storage device to transfer heat in and out. The present invention provides a heat storage device that enables rapid heat exchange between a medium and a latent heat storage material.

2) Structure of the Invention In order to achieve the above object, the heat storage device of K. and R.K. is arranged such that a heat storage material with a high melting point is placed in the center and heat storage materials with a low melting point are located around it. In addition to housing the latent heat storage materials, heat transfer tubes with needle-like fins are used as heat transfer pipes that transfer heat to and from each heat storage material, and heat transfer to each heat storage material or heat from the heat storage material is performed. The heat storage material is extracted through the needle-like fins, thereby improving the heat storage performance while improving the apparent thermal conductivity of the heat storage material.

(e) Examples Examples of the heat storage device of the present invention will be described below in accordance with the drawings. (11 is a container containing latent heat storage materials. Each heat storage material is divided by cylindrical partition walls (2) and (3), and the latent heat storage materials with a high melting point are placed in the center K, and the latent heat storage materials with a low melting point are sequentially placed around it. Heat storage chambers (4), (5), and (6) are arranged to store heat storage materials. (7) is for each heat storage chamber +4) +5) +6)
A large number of needle-like fins (8) are formed on the outer surface of each heat transfer tube (7), and the heat storage material and the heat transfer tube are connected through the needle-like fins (8). The structure is such that heat is exchanged between the two.

(91 (101) are heat medium pipes connected to the pump aυ to carry heat into and extract heat from such a heat storage device (1), and each heat transfer pipe (7) is a heat medium pipe connected to each heat storage chamber (4).
) (5) (6) Entrance/exit lohenoda (+21(
12) (131 (13) (Communicated via l) (ff+) (V2) (va) (V4)
(V!l) (V6) (■7) is a heat transfer pipe (9iQ[)
The electromagnetic hole 09, which sets which heat transfer tube (7) K of the heat storage chamber is connected to which the heat medium flowing in and out of the heat storage device (1) through the heat storage device (1) to exchange heat with the heat storage material, is also a four-way valve. The valve is connected to the temperature sensor (TI) installed in the heat storage chamber f4) (5) (61).
) (T2) ('rs) Opening/closing is controlled by a controller ([6) that receives the detected temperature of ('rs) as input.

As an example of the heat storage material, the heat storage chamber (4) contains sodium thiosulfate A (Na2S, Os"5H20) C melting point 4, which is a latent heat storage material (hereinafter referred to as high temperature heat storage material) having a high melting point.
8℃], and the heat storage chamber (5) contains sodium phosphate A (Na2HPO4' 12H20) C melting point 36, which is a latent heat storage material (hereinafter referred to as medium temperature heat storage material) having a melting point lower than this.
℃], the outermost heat storage chamber (6) further contains calcium chloride (C
aC1v 6H20) (melting point 29°C) is used, but the temperature level of the melting point of each heat storage material may be a high temperature level overall, or one with a large temperature level difference depending on the temperature of the heat medium used. In addition, the configuration of the heat storage chamber is not limited to the royal f4) (5) (6), but may be formed into a similar device with any number of chambers of 2 or more. In the device, for example, when storing heat using a heat medium heated to a certain temperature or higher by a heat source (lη) such as a solar heat collector, the controller (16) controls the temperature of this heat medium and each heat storage chamber (41 (5) ) (6), and when the temperature of the heat medium is high, the solenoid valve (■1) is set so that the heat medium flows from the high temperature heat storage material (4) side and sequentially flows to the low temperature heat storage material (6) side. (v7) and four-way valve 09 are controlled.

That is, when the temperature of the heat medium is higher than the temperature of the heat storage material in the high-temperature heat storage chamber (4), the four-way valve α9 is set to the state shown in the figure, the solenoid valve ffz) (V4XVa) is fully closed, and the solenoid valves (V, XV,
) (V6) (V7), the heat medium flows from the heat storage chamber (4) to the heat storage chamber (6) via the heat storage chamber (5), melts each latent heat storage material, and causes a state change ( There is no heat storage due to sensible heat difference as well as latent heat. In addition, the temperature of the heat medium is high in the high temperature heat storage chamber (4
) is lower than the temperature of the heat storage material, but higher than the temperature of the medium temperature heat storage material, the four-way valve aω is in the state shown in the diagram, and the solenoid valve (V2) is
(V, )ff, > (V7) closed, 'tffllv,
)(v,)(v,) If IHH-h, the heat medium does not flow into the high-temperature heat storage chamber (4), the medium-temperature heat storage chamber (5), and the low-temperature heat storage chamber (6).
In each heat storage process, the heat medium returns to the heat source a7 via the four-way valve (151, pump αυ), and flows again to the heat storage device (1) via the four-way valve (15+). However, when the temperature of the heat medium is higher than the temperature level of any of the heat storage materials, the controller 06 controls so that heat storage can be carried out at all times.

Next, when heat is extracted from this heat storage device (1) and hot water or hot water is supplied, water is supplied from the water tank u9 to the water heat exchanger section arranged to exchange heat with the heat medium. The heated water can be supplied to the load by controlling the four-way valve (15) and the solenoid valves (V, ) to (V7) using the controller α0.

For example, to supply hot water heated to a low temperature to a load using a heat storage device (11), set the four-way valve 0ω to the state indicated by the dotted line in the figure, open the solenoid valve (V, > (V4), and close the other solenoid If the valves (V2) ff3) (V5) to (■7) are closed, the heat medium will carry the heat from the low-temperature heat storage chamber (6) to the water heat exchanger α barrel, so the temperature level will not be very high. The temperature of the water supplied from the water supply tank (11) is also slightly heated before being supplied to the load (21).

At this time, if the heat source Q7) is functioning, the heat medium is also circulated to the heat source αD by the pump Ql), and only the shortage of heating heat in the water heat exchanger 0 is transferred to the heat storage device (
Supplement from 1). Moreover, if the heat source device (17) is not functioning, the heat medium flows to the side pipe (21) and is stored in the heat storage device (1).
Needless to say, the water heat exchanger A alone can supplement the heat of the barrel. Also, when sufficient heat is supplied by the heat source αη, the solenoid valve (■2) opens and the other solenoid valve (vl) (■3
) to (V7) When the heat supply to the heat medium is stopped or there is excess heat due to the relationship with the water heat exchanger 08, the system is switched to heat storage as described above. It is something that can be used.

FIG. 2 is a heat storage device showing another embodiment of the present invention,
The heat medium pipe (7) formed with needle-like fins is spirally wound and housed in the heat storage chamber f4) (51(6)K), and the other configuration is substantially the same as in Fig. 1. .Such a long heat transfer tube (7) with needle-like fins is, for example, a copper heat transfer tube (aluminum strip with fine cuts made on the outer periphery) as shown in Figure 3. It can be manufactured by wrapping (c).

With such a VCL, in the heat storage device of the present invention, when the temperature of the heat medium circulating in the heat source is low, K flows the heat medium to the low temperature heat storage material,
Since the heating medium can be made to flow into the high-temperature heat storage material as the temperature level increases, latent heat storage becomes possible from a state where the heating medium temperature is low.

For this reason, for example, when using a solar heat collector as a heat source, the optimal heat storage material should be selected depending on the seasonal conditions, such as high or low solar radiation, in order to improve the heat collection efficiency of the solar heat collector. It is also possible.

In particular, in the heat storage device of the present invention, a heat transfer tube with needle-like fins is used as the heat transfer pipe, and the heat storage material is filled between the needle-like fins, so that heat transfer, which is common in latent heat storage M', The heat storage efficiency is improved by compensating for the slow speed of heat transfer during temperature drop, heat storage, and heat radiation with the fins placed inside the heat storage materials.
It is possible to create a heat storage device with a high heat dissipation rate, and it is also possible to increase the chance of storing energy of the heat source used in combination with the heat storage device, thereby increasing the utilization efficiency of the heat source.

(F) Effects of the Invention As described above, the heat storage device of the present invention dissipates the stored energy by sequentially positioning the heat storage materials with a low melting point around the I & heat storage material with a high melting point. At the same time, heat transfer tubes with acicular fins are used for the heat transfer tubes that transfer heat to and from each heat storage material, and the space between these fins is filled with heat storage material, which reduces the heat storage and release process. The reduction in thermal conductivity caused by the solidified heat storage material can be compensated for by the acicular fins dispersed in the heat storage material, thereby providing a heat storage device that can store and release heat more smoothly than before.

In addition, since the heat storage device is constructed using multiple latent heat storage materials with different melting points, it is possible to efficiently store heat from a relatively low temperature to a high temperature range, and it is small and has a large heat storage capacity. It can also provide a heat storage device.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the heat storage device according to the present invention together with its usage mode, FIG. 2 is a longitudinal cross-sectional view showing another embodiment of the heat storage device, and FIG. 3 is the heat storage device of FIG. 2. It is a partial sectional view showing an example of the manufacturing process of the needle-like fin heat exchanger tube used for. (1)... Heat storage device, (4), (5), (6)...
・Heat storage chamber, (force...heat transfer tube, (8)...sword-shaped fin.

Claims (1)

[Claims] (1> Same - Container Internal Pressure In a container that stores multiple amounts of latent heat storage with different melting points, the heat storage materials are arranged so that the heat storage material with a high melting point is located at the center and the heat storage materials with a low melting point are located around it. A heat storage device configured such that heat transfer tubes with needle-like fins are used as heat transfer tubes that transfer heat to and from each heat storage material, and the heat storage material is filled between the needle-like fins. .