JPS61256161A - Radiator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling device that cools a room or the like by utilizing the cold energy of outside air, and particularly relates to a radiator thereof.

[Conventional technology]

In general, it absorbs the cold energy of the outside air and stores that cold energy.
A device is known that cools the room by re-extracting the stored cold heat.
or Long-Term Underground
Cool Storage Incorporating
Sky Radiation Cooling) + published by American Society of Mechanical Engineering (AsME),
Journal of Sol
ar Energy Engineering ) *
November 1984.

Vol, 106 J, r Principles and practices of natural cooling and heat utilization.

"Text of the Technical Seminar of the Japan Society of Solar Energy held on January 23, 1985, pages 23 to 33."

and ``Aiming for an independent house using 100% natural energy, magazine (Savemation) Vojf',
15 A 8.

(See pages 16-17).

Here, FIG. 5 shows an example of application to a so-called nighttime radiant cooling house. In FIG. 5, a radiator (commonly called a sky radiator) 100 is installed outdoors on a roof or the like. On the other hand, a cold storage tank 10 where water is stored underground
1 is provided.

Furthermore, a fan coil unit 102 is installed indoors. A water circulation system 104 is piped between the heat radiator 100 and the cool storage tank 101 via a pump 103, and a water circulation system 105 is piped between the cool storage tank 101 and the fan coil unit 102 via the pump 103. It is plumbed.

, A general structure of the heat sink 100 is shown in FIG.

In FIG. 6, the radiator 100 has an outer box 1, a heat insulating material 2 filled in the outer box 1, and a water passage 3 disposed inside the heat insulating material 2. and a heat dissipation plate 4 arranged in a state of being coupled to. The heat dissipation surface of the heat dissipation plate 4 is treated to have characteristics close to that of a black body.

The action can be explained as follows. Water as a refrigerant in the cold storage tank 101 is sent to the radiator 100 by the circulation system 104 at night when the outside temperature is low. The radiator 100 is cooled by the nighttime cooling effect, and the circulation system 104 is cooled again.
It is returned to the cold storage tank 101 and stored as cold energy.

Here, radiative cooling refers to the phenomenon in which, on a clear, low-humidity night, the amount of infrared energy emitted from an object placed on the ground is greater than the amount of infrared energy incident on the object from the sky, and as a result, the temperature of the object increases. This is a phenomenon of decrease.

The cold water stored in the cold storage tank 101 is transferred to the fan coil unit 102 by the circulation system 105.
It is used to cool the room by being blown away by the indoor air.

[Problem that the invention seeks to solve]

There are the following problems when using the above cooling device. First, heat radiation efficiency is poor even at night when the outside temperature is high. That is, the outside air temperature at night in summer is higher than the cold water temperature required for indoor cooling (usually 15°C or less), so even if heat is released to the sky by radiation cooling, heat will not enter the heat sink 100 from the surrounding air. This is because To prevent this, the heat sink 100
It is conceivable to put a transparent plastic film on top of the heat sink 100 with a gap close to the level of injury.However, this transparent plastic film would reduce the amount of infrared rays emitted from the heat sink 100, so it would not be effective. do not have.

Second, in order to cool the water in the cold storage tank 101, it is necessary to rely on the radiation cooling phenomenon at night, and the cooling operation is limited to nighttime only.

Thirdly, in hot and humid regions like Japan, there is little hope of nighttime cooling effects, and this is limited to areas with low humidity and clear skies, such as deserts and interior regions of the continent.

Accordingly, one object of the present invention is to provide a heat dissipation device for a cooling device that can be operated efficiently without being influenced by outside air temperature.

[Means for solving problems]

In order to solve the above problems, the present invention provides a cooling device that cools water circulated in a water passage insulated from the outside air by a radiation cooling effect via a heat sink thermally coupled to the water passage. In the heat sink.

A thermoelectric cooling element driven by a DC power source is thermally coupled to the heat sink, and a surface plate is disposed to be thermally coupled to the thermoelectric cooling element.

[For production]

According to the present invention configured as described above, the heat held by the water sent into the water passage is transmitted to the radiation plate thermally coupled to the water passage, and the radiation plate is further thermally coupled to the radiation plate. is absorbed by the low-temperature side portion of the thermoelectric cooler coupled to the In this way the water is cooled. On the other hand, the heat absorbed by the electronic cooling element is transferred to the thermally coupled surface plate via the high temperature side, so that one surface plate is heated to a temperature higher than the outside air temperature. As a result of this heating, the temperature difference between the surface plate and the heat sink increases, and therefore the amount of heat radiated from the surface plate increases. In addition, since the temperature of one surface plate is higher than the outside air temperature, heat can be radiated by convection of outside air. As described above, according to the present invention, the influence of outside air temperature can be reduced as much as possible, and heat can be efficiently dissipated.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows an embodiment of a heat sink according to the present invention. In FIG. 1, parts that overlap with those in FIG. 6 are given the same reference numerals, and detailed explanation thereof will be omitted.

The difference between FIG. 1 and FIG. 6 is that the electronic cooling cord 6 is superimposed on the heat sink 4 in a thermally coupled relationship, and the surface plate 8 is further superposed on top of it in a thermally coupled relationship. It is. The details of the above structure are shown in an enlarged scale in FIG.

In FIG. 2, an electronic cooling element 6 is provided between a heat sink 4 and a surface plate 8 via insulating films 5 and 7 (which are gas insulating and thermally conductive).

It has a laminated structure in the shape of a sunflower.

The electronic cooling element 6 utilizes the so-called Beltier effect, and includes low-temperature side contacts 9 and 10 made of steel plates, and high-temperature side contacts 11 and one double contact 9.
P-type semiconductor 12 and n interposed between 10 and 11
type semiconductor 13. Low temperature side contact 9.1
By applying a DC voltage of the polarity shown between 0 and 0,
Heat is absorbed at the low temperature side contact 9.10 due to the Beltier effect.

Heat is radiated from the high temperature side contact 11. The DC voltage source to be applied can be an AC/DC converter, a solar cell, or the like.

The surface plate 8 is A1. A heat-conducting metal plate such as Cu is used, and its heat dissipation surface is painted, for example, black, so as to have characteristics close to a perfect point body so that infrared rays can be easily radiated.

Next, the effect will be explained. FIG. 3 shows a system diagram of a cooling device using the heat dissipation device of the present invention. In order to make it easier to understand, the electronic cooling element 6 is schematically shown in an enlarged manner.

In FIG. 3, water (10° C.) that has been heated by absorbing the heat of indoor air by a fan coil 104 is supplied to the water passage 3 by a pump 103. The heat held by the water (10° C.) is absorbed by the heat sink 4 which is thermally connected to the water passage 3. The heat absorbed by the heat sink 4 is transferred to the high temperature contact 11 via the low temperature contact 9.10 and the semiconductor 12.13.
provided on the surface plate 8. The surface plate 8 is heated to a temperature (35 to 50°C) higher than the outside temperature (30°C).

At this time, if the temperature of the heat sink 4 is 75°C, the temperature of the surface plate 8 is 35 to 50°C.

The temperature difference is much larger than the conventional one (Fig. 2), and the temperature of the surface plate 8 itself (35-50°C)
is higher than the outside temperature (30°C). the result,
Heat from the water can be radiated not only from the surface plate 8 but also by convection with the outside air. This heat dissipation effect due to convection was previously impossible.

On the other hand, the cooled water (5° C.) in the first passageway 3 is returned to the fan coil 104 via the three-way valve 14, where it is subjected to heat exchange with the indoor air and does work, and the same cycle as above is repeated. will be repeated.

Furthermore, when indoor cooling is not required, the three-way valve 14 is switched to bypass the fan coil unit 104 and send cold water to the cold storage tank 1'01 provided underground to store cold heat. The cooling cycle in the case of cold storage is also the same as above, so the explanation will be omitted.

Furthermore, when the cold energy stored in the cold storage tank 101 is extracted 7 and used for indoor cooling, the four-way valve 15 is switched to form a closed loop between the fan coil unit 104 and the cold storage tank 101, and the pump 16 circulates the cold water. That's fine.

In the embodiment described above, the radiation surface of the surface plate 8 is painted black, but the invention is not limited to this.

It is also possible to emit radiation only in a specific wavelength range by performing selective radiation surface treatment. An example is shown below.

The ideal spectral radiation characteristics of the selective radiation surface are those shown in FIG. 6, and the characteristics of the black painted surface are also shown for comparison. The reason for using a selective radiation surface is 1. Since a selective radiation surface has low absorption in the wavelength range of solar radiation (0.3 to 2.5 μm), it is theoretically possible to radiate heat even under sunlight during the day. It is in.

When a selective radiation surface is used in a conventional heatsink, the operating temperature (
The temperature of the water flowing inside the radiator is often lower than the outside air temperature, and even when it is high, it is insignificant, so the heat radiating efficiency is poor and it is difficult to be effective. This is because the amount of heat radiation is proportional to the temperature difference between the radiator operating temperature (average temperature of water flowing inside the radiator) and the sky temperature.

On the other hand, when combined with an electronic cooling element as in the present invention, the heat of the surface plate 8 can be raised to a temperature considerably higher than the outside air temperature, so that the radiation efficiency can be improved. in this case.

An advantage is that a large temperature difference can be achieved without increasing the temperature of water, which is a heat medium.

In order to form a selective radiation surface, first, the surface plate 8 should be made of a shiny metal surface, and a material such as polyethylene, polypropylene, vinylidene fluoride, etc., which has high absorption in the wavelength range of 8 to 13 μm (see Figure 4), should be placed on top of it. A plastic film is evenly spread over the surface plate 8.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to efficiently operate a radiator using sky radiation, which has conventionally been ineffective in hot and humid regions such as Japan.

In conventional heat radiators, even if the heat radiating surface is treated with a selective radiation surface, operation is mostly limited to nighttime, but the present invention enables efficient heat radiating even under daytime sunlight.

Heat can be dissipated by convection in addition to sky radiation, so it can be operated at any time.

There is no backflow of heat from the outside air, which is a disadvantage of conventional radiators.

Thus, the present invention can provide a radiator that can be operated efficiently without being affected by outside temperature.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a heat sink according to the present invention;
Fig. 2 is an enlarged sectional view of the electronic cooling element, Fig. 3 is a system diagram of a cooling system using the radiator of the present invention, Fig. 4 is a spectral characteristic diagram of the selective reflection surface used in the present invention, and Fig. 5 6 is a system diagram showing an example of a conventional nighttime radiant cooling house, and FIG. 6 is a sectional view of a conventional radiator. 1...Outer box, 2...Insulation material. 3... Water passage, 4... Heat sink. 5.7...Insulating material, 6...Electronic cooling element. 8...Surface plate. Agent Tatsuyuki Unuma Figure 1 Figure 3 Figure 4 = X length (μm) Figure 5 Figure 6 Procedural amendment document June 1985-i Date 1 Case description 1985 Patent application No. 96401 3. Relationship with the case of the person making the amendment Patent applicant name < 689) Yazaki Sogyo Co., Ltd. 4, Agent name: Patent attorney (6697) Tatsuyuki Uunuma r') 7. Drawings subject to amendment 8, Content drawings of amendment , Figure 3? Correct as shown in the attached sheet. that's all

Claims (3)

[Claims] (1) In a radiator of a cooling device that cools water that is circulated in a water passage insulated from the outside air through a radiation cooling effect via a heat radiating plate that is thermally coupled to the water passage, a direct current is applied to the heat radiating plate. 1. A heat sink, characterized in that a thermoelectric cooling element driven by a power source is thermally coupled to the thermoelectric cooling element, and a surface plate is disposed to be thermally coupled to the thermoelectric cooling element. (2) The radiator according to claim 1, wherein the radiation surface of the surface plate is treated with a surface having characteristics close to that of a perfect black body. (3) In the device according to claim 1, the radiation surface of the surface plate is formed with a selective radiation surface that selectively emits radiation only in a predetermined wavelength range. .