JPH02140595A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent corrosion of a pipeline, to enable a hot water feed device and an external device to be used in common, and to enable effective utilization of a remote external heat source by providing first heating medium liquid formed by glycol liquid and a second heating medium, e.g. hot water, heat- exchanged with the first heating medium liquid heated by an external heat source and circulated through a heating pipeline. CONSTITUTION:When glycol liquid being first heating medium liquid is circulated through a circulating line 22 with the aid of a circulating pump 30 and hot water heated by an external heat source 36 is circulated through a heating line 34, hot water in an outer cylinder 14 heats glycol liquid in an inner cylinder 12. The glycol liquid heated and rising within the inner cylinder 12 is circulated in the circulating line 22, heat is radiated by a heat exchange part 26 being a radiation part to heat surroundings. Since the specific heat of the glycol liquid is low and therefore the glycol liquid is rapidly heated, a heat exchange is actuated as a heater with excellent rise. Since a substance being substantially anhydrous is used as the glycol liquid, corrosion of the circulating pipeline 22 is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a heat exchanger, and more particularly, a heat transfer liquid containing substantially anhydrous 100% glycol having a high boiling point and a low freezing point such as ethylene glycol. The present invention relates to a heat exchanger that uses a liquid to store heat from a heat source in a heat medium liquid, has a good start-up even with a small heat source, and has high thermal efficiency.

(Background Art) Conventionally, water has generally been used as a heat medium liquid for a heat exchanger in a floor heating device or the like. However, there is a problem in that water corrodes the pipes. Furthermore, in the past, for example, if a floor heating system and a hot water supply system were required, separate equipment had to be provided for each. That is, it is conceivable to directly route hot water from the hot water supply system to the circulation pipe of the floor heating system, but this is because the water becomes contaminated while circulating through the circulation pipe and becomes unfit for drinking.

In addition, there are cases where it is desired to use an external heat source such as factory exhaust heat as a heat source for a floor heating system. In this case, it is possible to heat the water using an external heat source and guide this hot water to the floor heating system, but if the external heat source is located far away, the problem is that the pipes are long (which increases the circuit load). In addition, the aforementioned problem of water corroding the pipes of the floor heating system remains.Since the pipes of this floor heating system are buried under the floor surface, it is difficult to replace them.

Therefore, the present invention was made to solve the above problems, and its purpose is to eliminate the problem of corrosion of the pipes in the main body of the device, and to be able to share the heat source with external devices such as water heaters. Another object of the present invention is to provide a heat exchanger that can effectively utilize a remote external heat source and has excellent thermal efficiency.

(Means for Solving the Problems) The present invention according to the above object includes a storage tank, a heat exchange section which is a heat radiation section, a circulation pipe connecting the storage tank and the heat exchange section, and a circulation pipe connecting the storage tank and the circulation section. A first heat transfer liquid made of a substantially anhydrous 100% glycol liquid, such as ethylene glycol, which has a low specific heat, a high boiling point, and a low freezing point, and which is sealed in a pipe; and the first heat transfer liquid. a heating pipe that enters the storage tank from outside the storage tank, passes through a first heat medium liquid in the storage tank, and is led out to the outside of the storage tank; an external heat source to which the heating pipe is connected; and a second heat medium such as hot water that is heated by the external heat source and circulated through the heating pipe to exchange heat with the first heat medium liquid made of the glycol liquid.
A heating medium is provided.

(Function) If glycol liquid, which is the first heat medium liquid, is circulated in the circulation pipe by a circulation pump, and hot water heated by an external heat source is circulated in the heating pipe, the hot water, etc. will flow into the storage tank. Warm the glycol solution inside.

This heated glycol liquid then circulates within the circulation pipe and radiates heat in the heat exchange section, which is a heat radiating section, heating the surrounding area.

Glycol liquid has a small specific heat, so it is quickly heated, so it works well as a heater.

Furthermore, since the glycol liquid used is substantially anhydrous, it will not corrode the circulation pipes.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a floor heating system.

10 is a storage tank, which has an inner cylinder 12 and an outer cylinder 14 as shown in the figure.
It has a double structure. A heat insulating material 16 is fixed to the outer wall of the outer cylinder 14.

Note that an air vent valve 18 is provided on the upper lid 20 of the storage tank 10, and is opened to release air to the outside when the internal pressure exceeds a certain level.

Reference numeral 22 denotes a circulation pipe, one end of which opens at the upper part of the inner cylinder 12 of the storage tank 10 and extends downward, as shown in the figure.
It meandering inside from the bottom to the top and exits the outer cylinder 14, and then comes into contact with a concrete or metal heat radiating plate 26 or the like at the heat exchange section 24, which is a heat radiating section, and then enters the storage tank 10 through the open chamber 28, where it is stored. The other end is open at the lower part of the tank 10.

30 is a circulation pump.

Ethylene glycol, which is a first heat transfer liquid, is sealed in the storage tank 10 and the circulation pipe 22.

This ethylene glycol has a molecular weight of 62.07, a boiling point of 197.6°C, a freezing point of -13.0°C, and a specific gravity of 1.
．． 1155, it is a colorless, odorless, sweet-tasting, slightly viscous, non-volatile liquid with physical properties of specific heat of 0.56.

Furthermore, 100% undiluted ethylene glycol is used. Since ethylene glycol has hygroscopic properties, the pipes and tanks should be sealed as tightly as possible to prevent moisture absorption. However, some amount of moisture cannot be avoided,
In the present invention, substantially anhydrous 100% ethylene glycol means that moisture absorbed and mixed in is tolerable. Also, some inhibitor may be mixed in to deal with this moisture. In the present invention, the heat transfer liquid is not limited to ethylene glycol, and glycols such as diethylene glycol and liquids having properties such as trust may be used alone or in combination.

The open chamber 28 communicates with the atmosphere through a through hole 32 provided in the lid as shown. The heating medium liquid sent from the circulation pipe 22 is partially discharged into the open chamber 28, and if air is mixed in the heating medium liquid in the circulation pipe 22, it is discharged to the outside of the heating medium liquid here. Ru. Storage tank 1
0 is filled with the heat medium liquid as shown in the figure, and this can be confirmed by the fact that the heat medium liquid rises into the open chamber 28. In this way, air is prevented from being sent into the circulation pipe 22 as much as possible. This is because the more air is mixed into the heat transfer liquid, the more the heat exchange rate decreases. Note that if air were to get mixed into the heat transfer liquid, it would move together with the viscous heat transfer liquid, and as described above, the air would move into the open chamber 28.
It is released within. The heat transfer liquid can be replenished into the storage tank 10 through the open chamber 28.

Reference numeral 34 denotes a heating pipe, the inflow side of which is connected to the lower part of the outer cylinder 14 of the storage tank 10, and the discharge side connected to the upper part of the outer cylinder 14. The heating pipe line 34 is connected to an external heat source 36 such as a boiler that utilizes waste heat from a factory, and hot water is circulated by a circulation pump (not shown). The hot water may be mixed with an antifreeze solution such as ethylene glycol. Alternatively, hot water may be distributed as steam. In this case, the heating pipe line 34 and the like need to have a pressure-resistant structure.

The water heater itself can also be used as the external heat source. That is, hot water from the water heater may be allowed to flow through the heating pipe line 34. In this case, if the heating pipe line 34 is set short, the hot water will not be contaminated by rust or the like.

With the above configuration, glycol liquid, which is the first heat medium liquid, is circulated in the circulation pipe 22 by the circulation pump 30, and hot water, etc. heated by the external heat source 36 is supplied to the heating pipe 34. When the water is circulated, hot water or the like in the outer cylinder 14 heats the glycol liquid in the inner cylinder 12. This heated glycol liquid that has risen inside the inner cylinder 12 then flows through the circulation pipe 2.
The heat exchanger 26, which is a heat radiator, heats the surrounding area.

Glycol liquid has a small specific heat, so it is quickly heated, so it works well as a heater.

Further, since the glycol liquid used is substantially anhydrous, it does not corrode the circulation pipe 22.

This device can be suitably used as a heating device such as a floor heating device, a hot air heater (a fan may be provided in the heat exchange section), or a snow melting device.

The present invention has been variously explained above with reference to preferred embodiments, but the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. That's true.

(Effects of the Invention) As described above, the heat exchanger according to the present invention provides the following remarkable effects.

■ Even if the heat source, such as factory waste heat, is located at a remote location, hot water, etc. can be guided through heating pipes, and the waste heat, etc. can be used effectively.

■ If the heat exchanger is a floor heating device or the like and the heating source is a water heater, the hot water from the water heater can be directly used as a heat source for the floor heating device, etc., and the heat source can be shared.

■ Temperature rises quickly.

Although glycol liquid has a low specific heat, its temperature rises quickly, and it can be operated as a heat exchanger in a short time after the heat source is turned on. In addition, even a relatively small heat source can be used sufficiently, making it possible to save energy and downsize the device.

■Excellent heat exchangeability.

It not only has excellent temperature rise characteristics and reaches high temperatures quickly, but also has low specific heat, so it has excellent heat dissipation, that is, heat exchange, and can sufficiently heat the heat transfer liquid even when it flows at high speed in the pipes. can do.

■Although glycol liquid has a high boiling point, it does not vaporize even at high temperatures, and there is no need for the main body to have a pressure-resistant structure, allowing equipment to be made smaller and made into parts, and is safe to handle.

(2) Of course, 100% glycol solution still has non-freezing properties and can be used in cold regions.

■ Since it contains no moisture other than absorbed moisture, there is almost no occurrence of rust, etc., and it has excellent corrosion resistance and can be used for a long time.

[Brief explanation of the drawing]

The drawing is an explanatory cross-sectional view when the device of the present invention is applied to a floor heating device. 10...Storage tank, 12...Inner cylinder, 14...
・Outer cylinder, 16...insulation material, 18...air vent valve,
20... Upper lid, 22... Circulation pipe, 24...
Heat exchange section, 26...Metal heat sink, 28...Open chamber, 30...Circulation pump, 34...
Heating pipe line, 36...external heat source.

Claims (1)

[Claims] 1. A storage tank, a heat exchange section that is a heat radiating section, a circulation pipe connecting the storage tank and the heat exchange section, and a material such as ethylene glycol sealed in the storage tank and circulation pipe that has a low specific heat. , a first heat transfer liquid made of a substantially anhydrous 100% glycol liquid having a high boiling point and a low freezing point, a circulation pump for circulating the first heat transfer liquid through the circulation pipe, and the storage tank. A heating pipe line that enters the storage tank from the outside and is led out to the outside of the storage tank via a first heat medium liquid in the storage tank, an external heat source to which the heating pipe line is connected, and the external heat source. A heat exchanger comprising: a second heat medium such as hot water that is heated by the hot water and circulated through the heating pipe to exchange heat with the first heat medium liquid made of the glycol liquid.