JPS60149893A - Heat exchanger - Google Patents

Abstract

PURPOSE:To make it possible to carry out heat exchange with good efficiency and also to carry out heat storage and recovery of heat by providing fins at a heat exchange path and passing a heating medium to the heat exchanger from the upper part to the lower part. CONSTITUTION:In the heat exchanger used in a solar heat hot water device or the like, the peripheral wall of a heat storage tank 1 is formed by a heat insulating material 17, and the inner part of the tank 1 is filled and sealed with a latent heat storing material 2 such as paraffin or the like. The heat exchange path 3 is formed by a metal pipe or the like, and an inlet port 14 is formed at the upper end and an outlet port 15 projects out of the heat storage tank 1. The heat exchange path 3 is disposed in the heat storage tank 1 in a zigzag manner, and a large number of parallel fins 4 are secured to the heat exchange path. Since the efficiency of the heat exchange is improved by fins 4, and a cool heat medium such as water or the like is supplied through the outlet port particularly when the heat is recovered, the latent heat storage material 2 tends to be slowly solidified. However, a convection is produced in the heat storage material 2 from the upper part thereof and the material 2 is solidified in a substantially uniform state. Hence, air bubbles which cause troubles in the heat exchange, do not infiltrate therein.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a heat exchanger used in solar water heating systems and the like.

[Background technology]

Latent heat storage materials are often used as heat storage materials in heat exchangers because they can quickly store and extract heat. As heat exchangers using this latent heat storage material, those shown in FIGS. 1 and 2 are conventionally known. The one in Figure 1 is formed in a double tube system with an outer tube (6) and an inner tube (7), and a latent heat storage material (2) is filled between the outer tube (6) and the inner tube (7). However, a heat medium is passed through the inner tube (7).

4!12・The one in the figure has multiple upper and lower layers of 5 (9) in the heat storage tank (8), and a latent heat storage material (2) packed in a bag on top of a (9).
is loaded, and the heat medium introduced from the inlet (10) is transferred to the heat storage tank (8).
) and taken out from the outlet (■). However, with these materials, the heat conduction between the heat medium and the latent heat storage material (2) is poor and the heat exchange rate is low.
There is a problem in that rapid heat storage and heat dissipation cannot be performed. Therefore, as shown in Fig. 3, the present inventors attached a tube (13) equipped with a heat storage tank (ft) K fin (12) filled with a latent heat storage material (2), We considered a device that allows the heat medium to pass through (this device is not publicly known).However, in this device, the heat medium is
3) K is supplied into the tube H from the inlet (10) at the lower end and taken out from the outlet (■) at the upper end of the tube (131), but this system has the following problems. In other words, when the latent heat storage material (2) is in a solid state and a heated heating medium such as hot water is passed through the inlet (! The material (2) starts to melt from the bottom and is stored as latent heat in the latent heat storage material (2).At this time, the latent heat storage material (2) changes from the same phase (2a) to the liquid phase (2b).
), it expands, so that a part of the latent heat storage material (2) in the lower liquid phase (2b) changes to the same phase (2) as shown in Figure 4(a).
A narrow path (2C) is created in the solid phase (2a) and flows out into the second part of the solid phase (2a). If the supply of the heating medium is stopped and left in this state, latent heat will continue to accumulate and the liquid phase (2b) will be divided into upper and lower halves. Next, in order to recover the heat stored as latent heat, the inlet at the bottom (+01
When a cold heating medium such as water is supplied into the tube θ3), the lower liquid phase (2b) absorbs heat from the heating medium and solidifies, but at this time, the lower liquid phase (2b) becomes the solid phase (2a ), and as this part contracts as it solidifies, the lower liquid phase (2b) will solidify in the solidified part as shown in Figure 4(c). contains air bubbles (16) corresponding to the volume of the shrinkage. And as a result of this greening, the amount of bubbles 0@ gradually increases, and bubbles (+6
), the heat medium and latent heat storage material (2) in the busy chew (+3)
), resulting in a problem in that the heat efficiency deteriorates and rapid heat storage and heat dissipation cannot be performed. Moreover, the liquid phase (2a) rose above the solid phase (2a).
2b) is located above the tube (1)
3) and does not directly contribute to the liquid phase (2b)Ii heat exchange in this part, which also poses the problem of not being able to perform efficient and rapid heat exchange. [Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a heat exchanger that can efficiently and quickly store and release heat.

[Disclosure of the invention]

Therefore, in the heat exchanger according to the present invention, the heat storage tank tl+ is filled with the latent heat storage material (2), and the heat exchange path (3) through which the heat medium flows in from the upper part and flows out from the lower part is meandering. (
11 and fins (4) on the heat exchange path (3).
It is characterized by having a heat exchange path (3).
The above object was achieved by Kokichi, who provided a pipe (4) in the heat exchange path (3) and supplied the heat medium to the heat exchange path (3) from the top 41.Hereinafter, the present invention will be described in detail by way of examples. .

The heat storage tank fl) has a peripheral wall made of a heat insulating material (17), and a latent heat storage material (2) such as paraffin is filled and sealed inside. The heat exchange path (3) is formed of a metal pipe, etc., with an inlet (I4) at the upper end and an outlet (+5) at the lower end of the heat storage tank (1).
As shown in Fig. 5, the heat exchange path (3) is installed inside the tilted heat storage tank (11) as shown in Fig. 6(a).
As shown in the figure, the horizontal pipe part (river, the diagonally downward bent pipe part α9 that connects the left and right horizontal pipe parts (18)) and the diagonally upward bent pipe part (20), which connects the upper and lower horizontal pipe parts (to). A vertically bent pipe part (21) is arranged in a meandering shape in the heat storage tank [l], and a large number of parallel fins (4) are connected to each horizontal pipe part α8 of the heat exchange path (3). ).

Therefore, the heat medium flow system is configured such that the heat medium is supplied to the heat exchange path (3) from the inlet 04 at the upper end, and the heat medium is recovered from the outlet (+5) at the lower end. When storing heat through a heated heat medium such as hot water in the heat exchange path (3), the latent heat storage material (2) is It gradually melts and generates M heat. At this time,
Heat exchange between the heat medium and the latent heat storage material (2) is performed efficiently by the fins (4). In this way, latent heat M heat material (2)
When the latent heat storage material (2) is melted, volumetric expansion occurs and the upper part of the latent heat storage material (2) comes to be above the upper end of the heat exchange path (3) as shown in FIG. Then heat exchange path (3) to recover heat
When a cool heating medium such as water is supplied from the inlet (14),
The latent heat storage material (2) solidifies as heat is taken away by the heating medium, but since it is passed through the heating medium I-i heat exchange path (3) from above, the latent heat storage material (2) solidifies from the second part. It tends to solidify. The heat medium flowing above the upper end of the heat exchange path (3) passes between the heat exchange paths (3), mixes with the solidifying latent heat storage material (2), and comes down to the bottom. This contributes to heat exchange with the heat exchanger, making it possible to effectively recover the amount of heat that has been stored. In addition, although the latent heat storage material (2) tends to solidify gradually from the top, the liquid phase of the latent heat storage material (2) is not surrounded by a solid phase and is almost uniform due to convection. It solidifies, and when the latent heat storage material (2) solidifies, almost no air bubbles enter.

〔Effect of the invention〕

As described above, in the present invention, since the heat exchange path is provided with fins, the heat exchange efficiency between the latent heat storage material and the heating medium can be increased by the fins, and heat storage and radiation can be performed quickly. In addition, since the heat medium is passed through the heat exchange path from the top to the bottom, air bubbles may enter the latent heat storage material, and the amount of heat in the latent heat storage material above the heat exchange path may decrease. There is no possibility that recovery is not performed, and heat can be efficiently stored and recovered through efficient heat exchange.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a conventional example, Fig. 2 is a sectional view of another conventional example, Fig. 3 is a sectional view of yet another conventional example, and Fig. 4 (a) (b) (c). is a schematic diagram showing the operation of the conventional example as described above, @5 is a sectional view of an embodiment of the present invention, and FIG. 6(a)
(b) is a front view and a side view of the same heat exchange passage section, and
The figure is a sectional view of the same as above. t4) is a heat storage tank, (2) is a latent heat storage material, (3) is a heat exchange path, and (4) is a fin. Agent Patent Attorney Ishi 1) Chief Figure 1 Figure 4 (Q) Figure 5 Figure 6 Figure 7 Procedural amendment (spontaneous) 1. Indication of the case Patent Application No. 5125 of 1982 2. Invention Name of heat exchanger 3, relationship with the case of the person making the amendment Patent Applicant Address 1048 Bold Kadoma, Kadoma City, Osaka Prefecture Name (
583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent 5, Date of amendment order 8, Contents of amendment

Claims (1)

[Claims] (1) The heat storage tank is filled with a latent heat storage material, and the heat exchange path through which the heat medium flows in from the top and flows out from the bottom is installed in the heat storage tank in a meandering manner, and fins are provided in the heat exchange path. Features of heat exchanger.