JPH0449035B2 - - Google Patents

Description

Detailed Description of the Invention Technical Field The present invention provides excellent piping efficiency and heat exchange efficiency in a composite heat exchange device consisting of a first and second exchange system, which is suitable as a heat storage type air conditioning system or a liquid supply system. This relates to meandering piping.

BACKGROUND ART Conventionally, a liquid storage tank is provided in the underground part of a building, and a piping system for passing a first heat medium is installed in this tank, and a second heat medium is stored, and the first heat medium is supplied through the piping system. The heat medium and the second heat medium liquid are exchanged with each other, and the second heat medium liquid is heated.
An air conditioning system for a building has been proposed in which a heat medium is supplied into the building and circulated between the supply area and the tank. This system consists of a first heat exchange system formed by a first heat medium and a second heat medium liquid, and a second heat exchange system formed by a second heat medium liquid and the supply area. When the second heat exchange system is not used, that is, when the second heat medium liquid is not supplied to the target area (supply area), only the first heat exchange system is operated and the second heat exchange system in the liquid storage tank is operated. It has the advantage that it can be used as a heat storage system that stores heat in a heat transfer liquid.

However, the above proposal only conceptually explains the system and does not specifically present the piping structure in the liquid storage tank in the first heat exchange system.

DISCLOSURE OF THE INVENTION The present inventors have discovered that the present invention is applicable not only to air conditioning systems for buildings, but also to air conditioning systems for structures such as ships and outdoors, and in the tank of the first heat exchange system in the composite heat exchange device, which is applicable as a liquid supply system. As a result of intensive research to develop the piping structure, we found that when using copper pipes and polyethylene pipes, which were conventionally used in general heat exchangers, the thickness of the pipes was reduced due to the abrasion effect of the first heat transfer medium, Problems such as contamination of the first heat transfer medium and second heat transfer liquid due to dissolution of components, and pipe breakage due to stress racking, etc.
We succeeded in overcoming this problem by using a special pipe and came up with the present invention.

That is, in the present invention, the first heat medium in the pipe and the first heat medium in the tank are connected via a pipe for passing the first heat medium installed in a liquid storage tank for storing the second heat medium liquid. In a composite heat exchange device that exchanges heat with two heat medium liquids, supplies the second heat medium liquid to a target area through a supply pipe, and circulates it again to the tank, flexible piping in the liquid storage tank is used. A cross-linked polyethylene pipe with water-crosslinking properties is connected in a meandering state between the header pipes in the depth direction of the tank by a connection method using a water-crosslinkable polyethylene adhesive, and the pipes between the header pipes are separated from each other by a grid-like holder. The present invention provides a piping structure with excellent piping efficiency, characterized in that the piping is maintained between the lattices of the piping.

In the present invention, the pipes are meandered to communicate with each other between the header pipes, to facilitate repair work such as pipe replacement, and piping work, and to improve the corrosion resistance, hygiene, and stress cracking resistance of the pipes. In particular, a flexible crosslinked polyethylene pipe is used from the viewpoints of durability at curved portions, heat resistance, and the relationship between the strength of the pipe and the degree of heat exchange, which is affected by the wall thickness. Examples of cross-linked polyethylene used to form pipes include chemically cross-linked polyethylene that forms a cross-linked structure when heated by blending polyethylene with an organic peroxide, polyethylene and vinyltrimethoxysilane, bityltriethoxysilane, etc. A crosslinked structure is formed by crosslinking with water, such as a silane grafted product using an unsaturated silane compound and an organic peroxide, or a copolymer made using ethylene and the unsaturated silane compound. Examples include water-crosslinked polyethylene (Japanese Unexamined Patent Publication No. 8446/1984, Japanese Patent Publication No. 1711/1983). The pipe in the present invention may be made only of the above-mentioned crosslinked polyethylene,
It may contain antioxidants, carbon black, pigments, and other compounding agents as required. The water-crosslinked polyethylene may also contain a silanol condensation catalyst such as dibutyltin dilaurate. The pipes, especially water-bridged pipes, may have already been crosslinked at the time of piping work, or may be in the process of being cross-linked or may not yet be cross-linked. Crosslinked polyethylene pipes have excellent physical (mechanical) and scientific properties, but in the present invention, since water is preferably used as the second heat transfer liquid, water crosslinked polyethylene pipes are advantageously used.

Next, the meandering piping structure of the present invention will be explained based on the drawings.

The embodiment relates to a cooling system.
As shown in Fig. 1, the composite heat exchange device consists of a liquid storage tank 1 for storing a second heat medium liquid such as water, two header pipes 2 installed in this tank, and nine rows arranged vertically ( (Fig. 2) A pipe for passing a first heat medium such as glycol, which is made of a cross-linked polyethylene pipe 3 having flexibility, a cooler 4 for cooling the first heat medium, the pipe and the inside of the cooler. A pump 5 for circulating the first heat medium, a supply pipe 6 for supplying the second heat medium liquid that has exchanged heat with the first heat medium through piping in the liquid storage tank to the destination area 8, and a supply pipe. 2nd through
It consists of a pump 7 for circulating the heat transfer liquid between the target area and the liquid storage tank. Two header pipes 2 in the piping are located at diagonal corners of the tank 1, and the pipe 3 connected to these header pipes via a water-crosslinkable polyethylene connecting agent is in a meandering state. There is communication between the hezder tubes.

Note that the pipe in the above example has a diameter of 10
The header tube has a diameter of 60 mm, a wall thickness of 6 mm, and a length of 60 cm, and the lattice-shaped holder is not shown in FIGS. 1 and 2.

Further, FIGS. 3 and 4 show another embodiment, in which a pipe approximately 25 m in length is interposed in a meandering manner.

In the present invention, there is a net 9 between the header pipes.
(Figures 3 and 4) are used to hold the meandering pipe between the grids. As a result, the pipes can be arranged at approximately equal intervals, and the second
This has the advantage of suppressing the movement of the pipe in the liquid storage tank when the heat transfer liquid is circulated.

Although the above embodiment is a cooling system, it can be made into a heating system by replacing the cooler with a heater, and by providing an appropriate second heat medium liquid outlet in the supply pipe, the cold liquid Alternatively, it is also possible to form a hot liquid supply system.

Advantages of the Invention According to the present invention, since a flexible cross-linked polyethylene pipe is used, a meandering piping structure can be easily formed with ease of handling, and its repair work is also easy. In addition to connecting the pipe and header pipe via adhesive, it is possible to obtain piping with a long life and high reliability.

In addition, because of the meandering piping structure, the total length of piping in the liquid storage tank can be increased with fewer connections between header tubes and pipes, resulting in piping with high pipe occupancy (piping efficiency). Therefore, it is possible to obtain piping with high heat exchange efficiency.

Furthermore, since the meandering pipe is held with a separate grid-like holder, the pipe can be held efficiently.
Even during operation, the meandering arrangement of the flexible pipes at equal intervals can be maintained, and the size of the heat exchange target area of each pipe can be made uniform, making it possible to further improve heat exchange efficiency.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the meandering piping structure in the composite heat exchange device of the present invention, FIG. 2 is a side view of the meandering piping structure, and FIG. 3 is an example of another meandering piping structure. The explanatory diagram, FIG. 4, is a side view thereof. 1: Liquid storage tank, 2: Header pipe, 3: Flexible cross-linked polyethylene pipe, 6: Supply pipe,
8: Target area, 9: Net.

Claims (1)

[Scope of Claims] 1. The first heat medium in the pipe and the heat medium in the tank are connected through a pipe for passing the first heat medium installed in a liquid storage tank for storing the second heat medium liquid. In a composite heat exchange device that exchanges heat with a second heat medium liquid and supplies the second heat medium liquid to a target area through a supply pipe and circulates it again to the tank, the second heat medium liquid is A flexible cross-linked polyethylene pipe is connected in a meandering manner between the header pipes in the depth direction of the tank using a water-crosslinkable polyethylene adhesive, and the pipes between the header pipes are connected in a separate lattice shape. A piping structure characterized by being held between lattices of a holding body. 2. The structure according to claim 1, wherein the crosslinked polyethylene forming the pipe is water crosslinked polyethylene.