JPH0449034B2 - - Google Patents

Description

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

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 liquid is stored, and a second heat medium is supplied through the piping system. An air conditioning system for a building is proposed in which heat is exchanged between a first heat medium and a second heat medium liquid, the second heat medium liquid is supplied into the building, and the supply area and the tank are circulated. ing. This system is a composite heat exchange system consisting of a first heat exchange system formed by a first heat medium and a second heat medium, and a second heat exchange system formed by a second heat medium liquid and the supply area. system, and 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 to transfer the second heat in the liquid storage tank. It has the advantage that it can be used as a heat storage system that stores heat in a medium.

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, By using a special pipe, we succeeded in overcoming problems such as contamination of the first heat medium and second heat medium due to dissolution of components and pipe breakage due to stress cracking, leading to 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. A composite heat exchange device that exchanges heat with two media and supplies the second heat medium liquid to a target area and circulates it again to the tank, which has flexibility in the piping in the liquid storage tank. A cross-linked polyethylene pipe is rotated at least once in a loop shape to communicate between the header pipes in the depth direction of the tank using a connection method using a water-crosslinkable polyethylene adhesive, and the pipes between the header pipes are connected in a separate lattice shape. The present invention provides an annular piping structure with excellent piping efficiency, which is characterized by being held between lattices of a holder.

In the present invention, in order to connect the pipes between the header pipes in a loop state, 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, cross-linked polyethylene pipes having flexibility are used from the viewpoints of durability of curved portions, the relationship between the strength of the pipe and the degree of heat exchange, which is affected by the wall thickness, and heat resistance. Examples of cross-linked polyethylene used to form pipes include chemically cross-linked polyethylene, which is a mixture of polyethylene and organic peroxide that forms a cross-linked structure when heated, 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 Patent Application Laid-open 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 pipes are advantageous.

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

As shown in FIG. 1, the embodiment relates to a cooling system. The composite heat exchange device consists of a liquid storage tank 1 for containing a second heat medium liquid such as water, a header pipe installed in this tank for passing a first heat medium such as glycol, and a water-crosslinkable polyethylene system. A pipe consisting of a flexible cross-linked polyethylene pipe 3 connected to the header pipe via an adhesive, a cooler 4 for cooling the first heat medium, and the first heat medium circulates through the pipe and the cooler. a second heat medium that exchanges heat with the first heat medium through piping in the liquid storage tank;
It consists of a supply pipe 6 for supplying the heat medium liquid to the target area 8 and a pump 7 for circulating the second heat medium liquid between the target area and the liquid storage tank via the supply pipe. In the embodiment, the first heat medium cooling set consisting of the piping inside the liquid storage tank, the circulation pump 5, and the cooler 4 is arranged in two rows.

As shown in Fig. 2, the flexible cross-linked polyethylene pipe 3 in the piping in the liquid storage tank of this device rotates twice in a spiral shape and is interposed in communication between the opposing header pipes, forming a track-like structure. It forms a piping structure.

In the embodiment described above, the track-shaped pipes are provided in four vertical rows. The pipe in the piping has a diameter of 10 mm, wall thickness of 1 mm, and length of 20 m, and the header pipe has a diameter of 60 mm, wall thickness of 6 mm, and length of 1.5 m.

FIG. 3 shows another example of an annular piping structure, in which the pipe 3 is arranged in a loop (approximately
1.5 rotations).

In the present invention, a net (not shown) is interposed between the header pipes, and the pipe 3 is held between the nets. Thereby, the pipes can be arranged at approximately equal intervals, and there is an advantage that the pipes can be prevented from oscillating in the liquid storage tank during circulation of the second heating medium liquid.

Although the above embodiment is a cooling system, it can be made into a heating system by using a heater instead of a cooler. Also, by providing an appropriate second heat medium liquid outlet in the supply pipe, cooling can be performed. A liquid or hot liquid supply system is also possible.

Advantages of the Invention According to the present invention, since a flexible cross-linked polyethylene pipe is used, it is easy to handle and can easily form an annular piping structure, and its repair work can be easily performed. By connecting the pipe and header pipe through adhesive, it is possible to obtain highly reliable piping with a long life.

In addition, since it has an annular piping structure, the total length of piping in the liquid storage tank can be increased with a small number of connections between header tubes and pipes, and piping efficiency (pipe occupancy rate) can be increased. In addition,
Piping can have high heat exchange efficiency.

Furthermore, since the loop-shaped pipe is held by a separate lattice-shaped holder, the pipe can be held efficiently, and even during operation, the flexible pipes can be maintained in an annular arrangement at equal intervals, allowing each pipe to be used for heat exchange. The size of the area can be made uniform, and the heat exchange efficiency can be further improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of a composite heat exchange device to which the annular piping structure of the present invention is applied;
FIG. 2 is a side view showing the annular piping structure, and FIG. 3 is a side view showing another annular piping structure. 1: Liquid storage tank, 2: Header pipe, 3: Flexible cross-linked polyethylene pipe, 6: Supply pipe,
8: Target area.

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 rotated at least once in a loop to communicate between the header pipes in the depth direction of the tank using a connection method using a water-crosslinkable polyethylene adhesive, and the pipes between the header pipes are separated. An annular piping structure characterized by being held between the lattices of a lattice-like holding body. 2. The structure according to claim 1, wherein the crosslinked polyethylene forming the pipe is water crosslinked polyethylene.