JP2003307459A - Method and apparatus for detection of intake heat quantity of underground heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for detecting an intake quantity of concrete underground heat in a place in which an underground heat exchanger is buried and to provide an apparatus for the method. <P>SOLUTION: A heating medium 2 such as water or the like in a prescribed circulation amount is circulated continuously to the underground heat exchanger 4 buried in the ground in a prescribed place from a supply tank 1 filled with ice lumps 3 so as to keep the heating medium 2 at a definite temperature, the circulation amount of the heating medium 2, temperatures on the entrance side 4a and the exit side 4b of the underground heat exchanger 4 for the thermal medium 2 and a temperature of the underground heat near the underground heat exchanger 4 are measured, respectively, and a quantity of the underground heat capable of being sampled in the prescribed place is detected on the basis of their measured values. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention relates to the heat extraction amount of a geothermal heat exchanger used when geothermal heat is used for air conditioning, hot water supply, hot water pool, plant cultivation, animal breeding or snow melting.
The present invention relates to a method and an apparatus for measuring the circulation amount of a heat medium supplied thereto, the temperature of the heat medium and the temperature of underground heat.

[0002]

2. Description of the Related Art Conventionally, a technique has been considered in which groundwater (hot water) is pumped up and used for air conditioning, hot water supply, hot water pool, plant cultivation, animal breeding, snow melting, etc.
In fact, it is not actively implemented. The reason is that when a large amount of groundwater is pumped up, problems such as land subsidence occur.

In recent years, a method of utilizing underground heat has been devised instead of this groundwater. That is, an underground heat exchanger is buried underground, and a heat medium such as water or an antifreeze solution is circulated in the ground heat exchanger for heat exchange, and the ground heat is collected by the heat medium. Since the technology of air conditioning, snow melting, etc. using the underground heat does not cause problems such as ground subsidence, active use in the future is desired.

[0004]

However, in the technique of utilizing the underground heat, since the temperature of the underground heat varies depending on the place where the underground heat exchanger is buried, how much underground heat can be collected. Difficult to grasp. Therefore, there is a problem that it is difficult to make a concrete geothermal heat utilization plan.

The present invention has been made in view of these problems, and an object thereof is to provide a method and an apparatus for detecting a concrete amount of underground heat to be collected at a place where the underground heat exchanger is buried. .

[0006]

Means for Solving the Problems An explanation will be given with reference to FIGS. 1 and 2. The method for detecting the amount of collected heat of an underground heat exchanger according to the present invention is a method for detecting the amount of collected heat from a supply tank 1 filled with ice blocks 3 to keep a heat medium 2 such as water at a constant temperature. A predetermined circulation amount of the heat medium 2 is continuously circulated in the exchanger 4, the circulation amount of the heat medium 2 and the temperatures of the heat medium 2 at the inlet side 4a and the outlet side 4b of the underground heat exchanger 4, The temperature of the underground heat near the underground heat exchanger 4 is measured, and the amount of the underground heat that can be collected at the predetermined place is detected from the measured values.

Further, the sampling heat quantity detecting device for the underground heat exchanger according to the present invention has at least a supply tank 1 filled with an ice block 3 and a ground at a predetermined place in order to keep the heat medium 2 such as water at a constant temperature. In order to circulate the heat medium 2 between the underground heat exchanger 4 buried inside and the supply tank 1 and the underground heat exchanger 4,
A circulation path 7 connected between the two, a circulation pump 8, a valve 9 and a flowmeter 10 provided in the circulation path 7, and a first heat medium thermometer 11 provided at an inlet side 4a of the underground heat exchanger 4. And a second heat medium thermometer 12 provided on the outlet side 4b, and a ground heat thermometer 13 provided near the ground heat exchanger 4, and the ground heat exchange from the supply tank 1 is performed. A predetermined circulation amount of the heat medium 2 is continuously circulated in the vessel 4, and the circulation amount of the heat medium 2 and the inlet side 4a and the outlet side 4 of the underground heat exchanger 4 of the heat medium 2
The temperature in b and the temperature of the underground heat near the underground heat exchanger 4 are measured, and the amount of the underground heat that can be collected at the predetermined location is detected from the measured values.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A method for detecting the amount of collected heat of an underground heat exchanger according to the present invention, together with an embodiment of the detection device, will be described with reference to FIG.
Will be described with reference to. This device uses water as a heat medium 2, and includes a supply tank 1, an intermediate tank 14, an underground heat exchanger 4, a circulation path 7, a circulation pump 8, a valve 9, a flow meter 10,
A first heat medium thermometer 11, a second heat medium thermometer 12, and an underground heat thermometer 13 are provided. The heat medium 2 is not limited to water, and, for example, antifreeze can be used.

The supply tank 1 stores the heat medium 2 which is water at 2 ° C.
In order to keep the temperature at 4 ° C., the ice lump 3 is filled, and an intermediate tank 14 also filled with the ice lump 3 is provided in communication with the ice lump 3. The underground heat exchanger 4 has an outer cylinder 5 whose bottom is closed.
And an inner cylinder 6 concentrically inserted therein, which is a concentric double pipe type and is buried at a depth of about 50 m to 100 m in the ground at a predetermined place. Instead of this concentric double pipe type, as shown in FIG. 2, it is possible to use a U-shaped type in which a partition wall 16 is provided in the central portion of the pipe body 15 and two passages 17 are formed. .

The circulation path 7 is connected between the supply tank 1 and the underground heat exchanger 4 in order to circulate the heat medium 2 between them, and comprises a forward path 7a and a return path 7b. In this circulation path 7, a circulation pump 8 for sending the heat medium 2, a valve 9 and a flow meter 10 for setting the circulation amount of the heat medium 2.
Is provided.

The first thermometer is the inlet side 4a of the underground heat exchanger 4.
The second heat medium thermometer 12 is provided on the outlet side 4b. A plurality of underground heat thermometers 13 are provided along the vicinity of the underground heat exchanger 4. By providing a plurality, the temperature of underground heat can be accurately grasped.

In the apparatus having such a structure, first, the circulation pump 8 is driven in order to detect the underground heat extraction amount. As a result, the heat medium 2 in the supply tank 1 kept at 2 ° C. to 4 ° C. is supplied to the underground heat exchanger 4 through the outward path 7 a via the intermediate tank 14. At this time, the circulation amount of the heat medium 2 is set to a predetermined value by the valve 9 and the flow meter 10.

The heat medium 2 supplied to the underground heat exchanger 4 passes through the inner cylinder 6 and then reverses at the lower end thereof to form a gap passage 5a formed between the inner cylinder 6 and the outer cylinder 5. Rise while collecting underground heat. Then, it passes through the return path 7b and returns to the supply tank 1, where it is cooled again to 2 ° C to 4 ° C.

While circulating the heat medium 2 in this manner, the ground heat temperature in the vicinity of the ground heat exchanger 4 is measured by the ground heat thermometer 13, and the first heat medium thermometer 11 and the second heat medium thermometer are measured. 12
Then, the temperature of the heat medium 2 before the underground heat extraction (temperature of the inlet side 4a)
And the temperature after sampling (the temperature on the outlet side 4b) are measured after a certain period of time. Based on the respective measured values thus obtained and the circulation amount of the heating medium 2, it is possible to detect the amount of underground heat that can be collected at the predetermined place.

For example, when a certain amount of the heat medium 2 is circulated for a certain period of time, the heat exchange causes the temperature of the heat medium 2 on the outlet side 4b to rise, while the temperature of the underground heat decreases. The temperature of the heat medium 2 on the outlet side 4b (the temperature measured by the second heat medium thermometer 12) is higher than the temperature on the inlet side 4a (the temperature measured by the first heat medium thermometer 11), and If the temperature of heat (the temperature measured by the underground heat thermometer 13) maintains a constant state as it is, it means that that much underground heat can be stably collected at that location. The number and scale of the underground heat exchangers 4 to be buried can be set based on that.

On the contrary, for example, when the temperature of the outlet side 4b of the heat medium 2 decreases to the same level as the temperature of the inlet side 4a, or the temperature of the underground heat continues to decrease, that much is found at that place. Since it means that there is no underground heat, the valve 9 is throttled to reduce the circulation amount of the heating medium 2 until the temperature becomes stable. Then, when the temperatures become stable, the number of the underground heat exchangers 4 and the like are set based on the stable temperature. In this way, by using this sampling heat quantity detection method and the apparatus thereof, it is possible to easily make a concrete underground heat utilization plan.

The apparatus according to the present invention employs an easy and stable technique of filling the supply tank 1 with the ice blocks 3 in order to set the heat medium 2 at a constant temperature. Can be made accurate, simple and inexpensive.

In addition to the commercial power source, the circulation pump 8 is
It can be operated by a solar thermal power generator or an internal combustion engine power generator. As shown in FIG. 3, the solar power generation device absorbs sunlight by the solar panel 18, and the storage battery box 1
The storage battery 21 in the control board 2 that operates when charging is required
The electric power is stored via 0, and a necessary amount of electric power is supplied to the pump 8 by the controller 22.

[0019]

EFFECTS OF THE INVENTION The method and apparatus for detecting the amount of collected heat of an underground heat exchanger according to the present invention circulate the heating medium 2 having a constant temperature through the underground heat exchanger 4 while controlling the circulation amount of the heating medium 2, By measuring the temperature on the inlet side 4a and the outlet side 4b of the medium 2 and the temperature of the underground heat, the amount of underground heat at the location can be detected. Therefore, a concrete geothermal heat utilization plan can be easily drafted.

Further, in order to set the heating medium 2 at a constant temperature, an easy and stable technique such as filling the supply tank 1 with the ice blocks 3 is adopted, so that the present apparatus is accurate, simple and inexpensive. Can be

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an apparatus according to the present invention.

FIG. 2 shows another embodiment of the underground heat exchanger according to the present invention, where (a) is a front sectional view and (b) is a plan sectional view.

FIG. 3 is a flowchart of a solar thermal power generator that operates a circulation pump of the device according to the present invention.

[Explanation of symbols]

1 supply tank 2 Heat medium 3 ice blocks 4 underground heat exchanger 4a entrance side 4b exit side 5 outer cylinder 5a Gap 6 inner cylinder 7 circuit 7a Outward route 7b Return trip 8 circulation pumps 9 valves 10 Flowmeter 11 First heat medium thermometer 12 Second heat medium thermometer 13 Underground heat thermometer 14 Intermediate tank 15 tube body 16 partitions 17 passage 18 solar panels 19 Storage battery box 20 control board 21 Battery 22 Controller

Claims (2)

[Claims] 1. An underground heat exchanger (4) buried in a ground at a predetermined place from a supply tank (1) filled with an ice block (3) in order to keep a heat medium (2) such as water at a constant temperature. A predetermined circulating amount of the heat medium (2) is continuously circulated, and the circulating amount of the heat medium (2) and the inlet side (4) of the underground heat exchanger (4) of the heat medium (2).
a) The temperature at the outlet side (4b) and the temperature of the underground heat near the underground heat exchanger (4) are measured, and the amount of underground heat that can be collected at the predetermined location is detected from the measured values. A method for detecting the amount of heat collected by an underground heat exchanger. 2. A supply tank (1) filled with an ice block (3) and at least a ground heat exchanger (6) buried in the ground at a predetermined location in order to keep at least a heat medium (2) such as water at a constant temperature. 4), a circulation path (7) connected between the supply tank (1) and the underground heat exchanger (4) in order to circulate the heat medium (2), and the circulation path (7). ), A circulation pump (8), a valve (9) and a flowmeter (10), and a first heat medium thermometer (11) and an inlet side (4a) of the underground heat exchanger (4). The second heat medium thermometer (12) provided on the outlet side (4b) and the underground heat thermometer (13) provided near the underground heat exchanger (4), and the supply tank From (1), a predetermined circulating amount of the heat medium (2) is continuously circulated through the underground heat exchanger (4), and the heat medium (2) is circulated.
Of the heat medium (2), the temperatures of the heat medium (2) at the inlet side (4a) and the outlet side (4b) of the underground heat exchanger (4), and the underground heat in the vicinity of the underground heat exchanger (4). An apparatus for detecting the amount of collected heat of an underground heat exchanger, which measures the temperature and detects the amount of underground heat that can be collected at the predetermined location from the measured values.