JP2003302122A - Geothermal unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geothermal unit for preventing any ground subsidence, or preventing any problems such as splash and a car accident even when the geothermal unit is applied to snow melting. <P>SOLUTION: This geothermal unit comprises a heat exchanger 1 which is perpendicularly embedded in the ground to collect the geothermal heat by circulating a first heating medium inside thereof, a heat radiation tube 2 to radiate the heat by circulating a second heating medium inside thereof, and a heat pump 3 which is connected to the heat exchanger 1 via a first circulation passage 4, connected to the heat radiation tube 2 via a second circulation passage 5, and has a third circulation passage 6 to circulate a third heating medium inside thereof, absorbs the heat of the first heating medium and raises the second heating medium. The heat radiation tube 2 is used for an air conditioner, a cold-hot water appliance, or a snow-melting appliance. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of geothermal heat, which is infinite in the ground, for cooling, heating, hot water, heated pools, plant cultivation, animal breeding including fish, or snow melting. The present invention relates to an apparatus used for such purposes. 2. Description of the Related Art Conventionally, techniques for using groundwater (hot water) for cooling and heating, hot water supply, hot water pool, plant cultivation, animal breeding, snow melting, and the like have been considered. Since this technology utilizes underground water existing in the ground, the operation cost is relatively low, and it is excellent in that it does not cause environmental problems such as air pollution. [0003] However, this conventional technique has a problem that land subsidence is induced because a large amount of groundwater is required. In addition, for example, when used for melting snow on a road surface, there is a problem that water must be sprinkled, so that water splashes or water freezes and causes an automobile accident or the like. The present invention has been made in view of the above problems, and an object of the present invention is to provide a device which does not cause land subsidence and which does not cause problems such as water splashing and car accidents even when used for melting snow. Make it an issue. A description will be given with reference to FIGS. 1 to 5. The underground heat utilization device according to the present invention is buried vertically in the ground, circulates the first heat medium therein to collect the underground heat, and circulates the second heat medium therein. Radiating pipe 2 for releasing the heat, the heat exchanger 1 and the first circulation path 4
And a third circulation path 6 for circulating the third heat medium therein, which is connected to the radiator pipe 2 and the second circulation path 5,
A heat pump 3 that absorbs heat of the first heat medium and raises the temperature of the second heat medium, and uses the radiator pipe 2 as a cooling / heating device, a cold / hot water device, or a snow melting device. FIG. 1 to FIG. 4 show an embodiment of a geothermal heat utilization apparatus according to the present invention. This device includes a heat exchanger 1, a radiator tube 2, and a heat pump 3. Also,
A heat storage tank 8 for storing surplus heat until needed is also provided. [0007] The heat exchanger 1 is buried vertically until it reaches about 100 m to 200 m underground, and circulates a first heat medium inside to collect underground heat. Although the structure of the heat exchanger 1 is not limited, for example, a concentric double tube type or a U-tube type can be used. [0008] As shown in FIG.
The inner cylinder 1b is inserted concentrically into the outer cylinder 1a whose bottom end is closed, and the first heat medium is fed from the upper end of the inner cylinder 1b.
b, the ground heat is collected while raising the gap 1c formed between the outer cylinder 1a and the inner cylinder 1b by inverting at the lower end,
It is discharged from the upper end. In the U-tube type, as shown in FIG. 3, a partition 1e is provided at the center of a pipe main body 1d to form two passages 1a.
f is formed, the first heat medium is supplied from one of the passages 1f, inverted at the lower end, raised, and discharged from the upper end. The heat radiating pipe 2 is formed by bending a pipe in a so-called hairpin curve shape, circulates a second heat medium therein, and releases the heat. The heat pump 3 is connected to the heat exchanger 1 by a first circulation path 4 having a circulation pump 7 and is connected to the heat radiating pipe 2 by a second circulation path 5 having a circulation pump 7. A third circulation path 6 for circulating the third heat medium, absorbs the heat of the first heat medium, and raises the temperature of the second heat medium by the heat. In this embodiment, the radiator tube 2 is mainly used as a cooling / heating device. That is, the heat radiating pipe 2 is used as a heating tank 9 for storing warm air, a cooling tank 10 for storing cool air, a panel heater 11, a fan heater 12, a beverage cooler 13, and the like. The underground heat utilization apparatus according to this embodiment operates as follows. First, the circulation pumps 7 provided in the first circulation path 4 and the second circulation path 5 are respectively driven, and the heat pump 3 is driven. Thereby, the first liquid medium circulates in the heat exchanger 1 to collect the underground heat, and reaches the heat pump 3 through the first circulation path 4. In the heat pump 3, the third heat medium absorbs the heat of the first heat medium, and performs expansion and compression steps, thereby raising the temperature of the second heat medium. The heated second heat medium passes through the second circulation path 5 and reaches the radiator tube 2 where heat is radiated. By repeating such a process, heat is continuously and effectively radiated. Another embodiment of the present invention is shown in FIG. In this embodiment, the radiator tube 2 is mainly used for hot water equipment. That is, the radiator pipe 2 is used for a hot water storage tank 14 for storing hot water, a different type of bath 15 or a hot water pool 16. The heat pump 3 functions as a refrigerator and can be used for cooling. When the radiator tube 2 according to the present invention is used for snow melting equipment, a plurality of the radiator tubes are buried immediately below the road surface, radiate heat continuously therefrom, and the heat melts the snow on the road surface. Since the underground heat utilization apparatus according to the above-described embodiment uses underground heat instead of underground water as in the related art, it does not cause land subsidence. Also,
When used for melting snow on a road surface, there is no need to sprinkle water as in the prior art, so that problems such as water splashing and car accidents do not occur. In addition, since the abundant underground heat existing in the ground is used, the operating cost is low and environmental problems such as air pollution do not occur. The heat pump 3 and the circulation pump 7 are
It can be operated by a solar thermal power generator or an internal combustion engine power generator in addition to the commercial power supply. Fig. 6
As shown in, the solar panel 17 absorbs sunlight,
The power is stored in the storage battery 20 in the storage battery box 18 via the control board 19 that operates when charging is necessary, and the controller 2
1 supplies a required amount of electric power to the heat pump 3 and the circulation pump 7. The underground heat utilization device according to the present invention utilizes underground heat and does not cause land subsidence. Also,
When used for melting snow on the road, it does not cause problems such as water splashing or car accidents. In addition, since the abundant underground heat existing in the ground is used, the operating cost is low and environmental problems such as air pollution do not occur.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing an embodiment of the present invention. FIG. 2 is a front sectional view showing an embodiment of the heat exchanger according to the present invention. FIG. 3 is a front sectional view showing another embodiment of the heat exchanger in the present invention. FIG. 4 is a configuration diagram showing details of an embodiment of the present invention. FIG. 5 is a configuration diagram showing details of another embodiment of the present invention. FIG. 6 is a flowchart of a solar thermal power generation device that operates a heat pump or the like of the device according to the present invention. [Description of Signs] 1 heat exchanger 1a outer cylinder 1b inner cylinder 1c gap path 1d pipe main body 1e partition wall 1f passage 2 radiating pipe 3 heat pump 4 first circulation path 5 second circulation path 6 third circulation path 7 circulation pump 8 heat storage Tank 9 Heating tank 10 Cooling tank 11 Panel heater 12 Fan heater 13 Beverage cooler 14 Hot water storage tank 15 Bathhouse 16 Hot water pool 17 Solar panel 18 Battery box 19 Control board 20 Battery 21 Controller

Claims (1)

Claims: 1. A heat exchanger (1) buried vertically in the ground and circulating a first heat medium inside to collect ground heat, and a second heat medium inside the heat exchanger. A radiating pipe (2) for circulating and releasing the heat is connected to the heat exchanger (1) by a first circulation path (4), and is connected to the radiating pipe (2) and a second circulation path (5). A heat pump (3) having a third circulation path (6) for connecting and internally circulating a third heat medium, absorbing heat of the first heat medium, and raising the temperature of the second heat medium; An underground heat utilization apparatus, wherein the radiator pipe (2) is used as a cooling / heating device, a cold / hot water device, or a snow melting device.