JP7209965B2 - gas vaporization system - Google Patents

Description

The present invention relates to a gas vaporization system for vaporizing liquefied gas.

Conventionally, gas vaporization systems have been known in which liquefied gases such as liquefied natural gas, liquefied argon, liquefied nitrogen, liquefied oxygen, liquefied ethane, and liquefied ethylene are heated by heat exchange with a heat exchange liquid to vaporize the gas. It is For example, the vaporization device described in Patent Literature 1 includes a boiler device and a vaporizer. Hot water heated by the boiler device is introduced into the vaporizer. A heat transfer tube portion is provided in the vaporizer. The heat transfer tube section guides the liquefied natural gas. The liquefied natural gas flowing through the heat transfer tubes is vaporized by heat exchange with hot water. Boiler equipment uses fuel.

Japanese Patent No. 6293331

However, the vaporizer heats water with a boiler to generate hot water. Therefore, the cost of fuel for driving the boiler equipment was high. Here, in the field of air conditioning for indoor air conditioning, there is known a heat pump device that performs air conditioning at low cost by heat exchange using a heat pump system without using fuel such as propane gas. The heat pump device heats or cools the second liquid using, for example, the temperature of the first liquid heated or cooled by heat exchange with geothermal heat. Then, the temperature of the second liquid heated or cooled by the heat pump device is used to heat or cool the air conditioner.

Generally, when a heat pump device is used for indoor air conditioning, it is set for heating in winter and for cooling in summer. The underground temperature is almost constant throughout the year. Therefore, in winter, the first liquid is heated by geothermal heat, the temperature of the first liquid is used by the heat pump device to heat the second liquid, and the temperature of the second liquid is used to heat the room. can. In summer, the ground heat can cool the first liquid, the temperature of the first liquid can be used to cool the second liquid by the heat pump device, and the temperature of the second liquid can cool the room.

However, when vaporizing the liquefied gas, it is necessary to heat the liquefied gas throughout the year, so it is necessary to heat the second liquid throughout the year. When the heat pump method is adopted for the gas vaporization system, the first liquid can be heated by geothermal heat in winter, and the second liquid can be heated by the heat pump device using the temperature of the first liquid. However, in summer, the temperature of the first liquid is higher than that of the ground, so the first liquid cannot be heated by geothermal heat. Therefore, in the heat pump device, the temperature of the first liquid cannot be used to heat the second liquid, and the liquefied gas cannot be vaporized. Therefore, when the heat pump method was used, the liquefied gas could not be vaporized throughout the year. Therefore, the heat pump method could not be adopted for the gas vaporization system.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas vaporization system using a heat pump method.

A gas vaporization system according to the present invention comprises a geothermal heat exchange unit that exchanges heat between a first liquid and underground heat, an air heat exchange unit that exchanges heat between the first liquid and air, and a heat pump system. a heat pump unit that performs heat exchange between the first liquid and the second liquid; and a gas vaporization unit that vaporizes the liquefied gas by heat exchange between the second liquid heat-exchanged in the heat pump unit and the liquefied gas, A flow path through which the first liquid flows, the first flow path connecting the underground heat exchange section and the air heat exchange section, and a flow path through which the first liquid flows, the air heat exchange section A second flow path connecting the heat pump section, a flow path through which the first liquid flows, a third flow path connecting the underground heat exchange section and the heat pump section, and through the first flow path A case where the first liquid flows from the underground heat exchange section to the air heat exchange section, and a case where the first liquid flows from the underground heat exchange section to the heat pump section via the third flow path. and a first switching unit for switching. In this case, for example, in winter and at night, when the air temperature is low and the first liquid cannot be heated in the air heat exchange section, the first liquid is heated by the underground heat exchange section, and the heated first liquid is transferred to the second liquid. It is possible to flow from the underground heat exchanger 11 to the heat pump section via three passages 23 . The temperature of the first liquid can then be used in the heat pump section to heat the second liquid. The heated second liquid can then flow through the gas vaporizer and be used to vaporize the liquefied gas. Further, for example, in spring, summer, autumn, and daytime, when the temperature is high and the first liquid can be heated in the air heat exchange section, the first liquid heat-exchanged in the underground heat exchange section is A first liquid can be sent through a channel to an air heat exchange section to heat the first liquid in the air heat exchange section. The temperature of the first liquid can then be used in the heat pump section to heat the second liquid. The heated second liquid can then flow through the gas vaporizer and be used to vaporize the liquefied gas. Thus, the heat pump method can be used to vaporize the liquefied gas throughout the year. Therefore, a heat pump method can be used for the gas vaporization system.

The gas vaporization system includes a first temperature acquisition means for acquiring a first temperature, which is the temperature of the first liquid flowing through the first channel or the third channel, and a second temperature, which is the temperature of outside air. a second temperature acquisition means; and a first temperature determination means for determining whether the first temperature acquired by the first temperature acquisition means is lower than the second temperature acquired by the second temperature acquisition means. And, when the first temperature determination means determines that the first temperature is lower than the second temperature, the first switching unit is controlled to switch the underground heat exchange unit through the first flow path When it is determined that the first temperature is not lower than the second temperature by the first control means for flowing the first liquid from the air heat exchange portion, and the first temperature determination means, the first switching portion and a second control means for causing the first liquid to flow from the underground heat exchange section to the heat pump section through the third flow path. If the first temperature is lower than the second temperature, which is the temperature of the outside air, it is possible to heat the first liquid in the air heat exchange section. Therefore, the first liquid can be heated by causing the first liquid to flow through the air heat exchange section by the first control means. On the other hand, when the first temperature is equal to or higher than the second temperature, which is the temperature of the outside air, it is difficult to heat the first liquid in the air heat exchange section. For this reason, the second control means causes the first liquid to flow directly from the underground heat exchange section to the heat pump section without flowing the first liquid to the air heat exchange section. In this way, depending on the relationship between the first temperature and the second temperature, the first liquid flows from the underground heat exchange section to the air heat exchange section through the first flow path, and the ground flow through the third flow path. The case where the first liquid flows from the intermediate heat exchange section to the heat pump section is automatically switched. Therefore, it is not necessary for the user to manually switch, and the user's convenience is improved.

The gas vaporization system includes a fourth flow path through which the first liquid after being used for heat exchange in the heat pump section flows, and which connects the heat pump section and the underground heat exchange section. good too. In this case, the provision of the fourth flow path 24 allows the first liquid that has been used for heat exchange in the heat pump section to flow to the underground heat exchanger. Therefore, for example, when the underground temperature is higher than the first liquid, the first liquid can be flowed from the heat pump section to the underground heat exchange section to heat the first liquid. Further, for example, when the underground temperature is lower than the first liquid, the first liquid is flowed from the heat pump section to the underground heat exchange section, and the underground is warmed in the underground heat exchanger section so that the underground becomes the so-called It is possible to reduce the possibility of "heat withering".

The gas vaporization system includes a flow path through which the first liquid after being used for heat exchange in the heat pump section flows, the fifth flow path connecting the heat pump section and the air heat exchange section; When the first liquid flows from the heat pump section to the underground heat exchange section via four flow paths, and when the first liquid flows from the heat pump section to the air heat exchange section via the fifth flow path. A second switching unit for switching between the case and the case may be provided. In this case, it is possible to switch between the case where the first liquid is allowed to flow through the underground heat exchange unit and the case where the first liquid is not allowed to flow. Therefore, for example, only when the first liquid that has flowed out from the heat pump section to the fourth flow path has a temperature enough to warm the underground, the first liquid is allowed to flow through the underground heat exchange section and can reduce the possibility of so-called "heat withering".

In the gas vaporization system, a third temperature acquiring means for acquiring a third temperature, which is the temperature of the first liquid flowing through the fourth flow path, and a state in which the first liquid is flowing through the underground heat exchange section. a fourth temperature acquiring means for acquiring a fourth temperature that is the temperature of the first liquid flowing through the first flow path; and the third temperature acquired by the third temperature acquiring means is the fourth temperature acquiring means. a second temperature determining means for determining whether or not the fourth temperature acquired by the means is greater than the fourth temperature; and when the second temperature determining means determines that the third temperature is greater than the fourth temperature, the Third control means for controlling the second switching part to flow the first liquid from the heat pump part to the underground heat exchange part through the fourth flow path; When it is determined that the temperature is not higher than the fourth temperature, the second switching section is controlled to flow the first liquid from the heat pump section to the air heat exchange section through the fifth flow path. and fourth control means. If the third temperature is greater than the fourth temperature, the underground heat exchanger section uses the temperature of the first liquid to heat the ground. When the ground is warmed in the underground heat exchange section, the first liquid is flowed from the heat pump section to the underground heat exchange section through the fourth flow path, so that the underground is warmed and the underground is warmed. It is possible to reduce the possibility of a so-called "heat withered" state. On the other hand, when the third temperature is not higher than the fourth temperature, the first liquid is taking heat from the underground in the underground heat exchange section. When the first liquid is in a state of taking heat from the underground, the first liquid flows from the heat pump device to the air heat exchange section through the fifth flow path, so that the first liquid flows into the underground heat exchange section. is not flushed. For this reason, it is possible to reduce the possibility that the underground heat is taken away in the underground heat exchange section and the underground is in a state of so-called "heat exhaustion".

The gas vaporization system is a flow path through which the first liquid after heat exchange in the air heat exchange section flows, and a sixth flow path connecting the air heat exchange section and the underground heat exchange section. a case where the first liquid flows from the air heat exchange section to the heat pump section through the second flow path; A third switching unit for switching between flowing the first liquid and flowing the first liquid may be provided. When the first liquid flows from the air heat exchange section to the heat pump section through the second flow path, the temperature of the first liquid heated in the air heat exchange section may be used to heat the second liquid in the heat pump section. can. Further, when the first liquid flows from the air heat exchange section to the underground heat exchange section, the temperature of the first liquid heated in the air heat exchange section can be used to warm the underground in the underground heat exchange section. . Therefore, it is possible to reduce the possibility that the ground will be so-called "heat withered".

When the vaporization of the liquefied gas by the gas vaporization unit is stopped, the gas vaporization system controls the third switching unit to convert the air heat exchange unit to the ground via the sixth flow path. A fifth control means may be provided for causing the first liquid to flow through the intermediate heat exchange section. In this case, when the vaporization of the liquefied gas by the gas vaporization section is stopped, the temperature of the first liquid heated in the air heat exchange section can be used to warm the underground in the underground heat exchange section. Therefore, it is possible to reduce the possibility that the ground will be so-called "heat withered".

The gas vaporization system includes a flow path through which the second liquid flows, a seventh flow path that connects the heat pump section and the gas vaporization section, and a flow path through which the first liquid flows, an eighth flow path connecting the air heat exchange section and the gas vaporization section; and the first liquid flowing from the air heat exchange section to the heat pump section through the second flow path, and the seventh flow path switching between a case where the second liquid flows from the heat pump section to the gas vaporization section via the second liquid and a case where the first liquid flows from the air heat exchange section to the gas vaporization section via the eighth passage. A fourth switching unit may be provided. When flowing the first liquid from the air heat exchange section to the gas vaporization section through the eighth passage, the first liquid heated in the air heat exchange section can be used to vaporize the liquefied gas. Therefore, there is no need to drive the heat pump section, and the operating cost of the gas vaporization system can be reduced.

The gas vaporization system includes: fifth temperature acquisition means for acquiring a fifth temperature that is the temperature of the first liquid flowing through the second flow path or the eighth flow path; a third temperature determining means for determining whether the fifth temperature is lower than a vaporization temperature, which is a temperature at which the liquefied gas can be vaporized by the gas vaporizing section; When it is determined that the temperature is lower than the vaporization temperature, the fourth switching section is controlled to flow the first liquid from the air heat exchange section to the heat pump section through the second flow path, and the seventh sixth control means for causing the second liquid to flow from the heat pump section to the gas vaporization section through a flow path, and when the third temperature determination section determines that the fifth temperature is not lower than the vaporization temperature and seventh control means for controlling the fourth switching section to cause the first liquid to flow from the air heat exchange section to the gas vaporization section through the eighth passage. In this case, when the fifth temperature is equal to or higher than the vaporization temperature, the first liquid is automatically flowed to the gas vaporizer and used to vaporize the liquefied gas. Therefore, it is not necessary for the user to manually switch the flow path, and the user's convenience is improved.

It is a figure which shows the structure of the gas vaporization system 1 in a 1st state. 2 is a diagram showing an electrical configuration of the gas vaporization system 1; FIG. It is a figure which shows the structure of the gas vaporization system 1 in a 2nd state. It is a figure which shows the structure of the gas vaporization system 1 in a 3rd state. It is a figure which shows the structure of the gas vaporization system 1 in a fourth state. FIG. 10 is a diagram showing the configuration of the gas vaporization system 1 in the fifth state; FIG. 10 is a diagram showing the configuration of the gas vaporization system 1 in the sixth state; 4 is a flowchart of main processing; FIG. 9 is a flowchart continued from FIG. 8; FIG. FIG. 10 is a flowchart continued from FIG. 9; FIG.

A gas vaporization system 1 embodying the present invention will be described below. First, with reference to FIG. 1, the outline of the gas vaporization system 1 will be described. The gas vaporization system 1 shown in FIG. 1 is a system that uses the temperature of the first liquid 81 or the second liquid 82 to vaporize the liquefied gas in the liquefied gas container 141 . Liquefied gas includes, for example, LNG (Liquefied Natural Gas), liquefied argon, liquefied nitrogen, liquefied oxygen, liquefied ethane, and liquefied ethylene. In this embodiment, as an example, the liquefied gas 142 is assumed to be LNG. The gas obtained by vaporizing the liquefied gas 142 is, for example, sent to power generation equipment (not shown) and used for power generation and the like. In the following description, the upper side and the lower side of the paper surface of FIG. 1 are called the upper side and the lower side of the gas vaporization system 1 . The lower side of the gas vaporization system 1 is in the direction of gravity, and the upper side is in the anti-gravity direction. Also, the first liquid 81 and the second liquid 82 are assumed to be water as an example.

A configuration of the gas vaporization system 1 will be described. The gas vaporization system 1 includes an underground heat exchanger 11, a water-air heat exchange unit 12, a heat pump device 13, a gas vaporization facility 14, a first flow path 21, a second flow path 22, a third flow path 23, a fourth flow It includes a channel 24, a fifth channel 25, a sixth channel 26, a seventh channel 27, an eighth channel 28, a ninth channel 29, a tenth channel 30, and the like.

The underground heat exchanger 11 is provided downward from the ground surface 105 . The underground heat exchanger 11 exchanges heat between underground heat and the first liquid 81 . The water-air heat exchange unit 12 is a device that exchanges heat between the first liquid 81 and air. The heat pump device 13 is a device that performs heat exchange between the first liquid 81 and the second liquid 82 by a heat pump method.

The gas vaporization equipment 14 warms and vaporizes the liquefied gas 142 by heat exchange between the first liquid 81 or the second liquid 82 flowing from the flow path 672 and the liquefied gas 142 in the liquefied gas container 141 . The first liquid 81 or the second liquid 82 used to vaporize the liquefied gas 142 flows out to the channel 691 .

The first channel 21 is a channel through which the first liquid 81 flows, and connects the underground heat exchanger 11 and the water-air heat exchange unit 12 . The first channel 21 includes channels 611 , 612 , 613 . The second channel 22 is a channel through which the first liquid 81 flows, and connects the water-air heat exchange unit 12 and the heat pump device 13 . The second channel 22 includes channels 621 , 622 , 623 and 624 .

The third channel 23 is a channel through which the first liquid 81 flows, and connects the underground heat exchanger 11 and the heat pump device 13 . The third channel 23 includes channels 611 , 612 , a channel 631 , and channels 622 , 623 , 624 . The fourth flow path 24 is a flow path through which the first liquid 81 after being used for heat exchange in the heat pump device 13 flows, and connects the heat pump device 13 and the underground heat exchanger 11 . The fourth channel 24 includes channels 641 , 642 , 643 , 644 .

The fifth flow path 25 is a flow path through which the first liquid after being used for heat exchange in the heat pump device 13 flows, and connects the heat pump device 13 and the water-air heat exchange unit 12 . The fifth channel 25 includes channels 641 , 642 , 643 , a channel 651 and channels 612 , 613 . The sixth flow path 26 is a flow path through which the first liquid 81 after heat exchange in the air heat exchange unit 12 flows, and connects the water-air heat exchange unit 12 and the underground heat exchanger 11 . The sixth flow path 26 includes flow paths 621,622, flow path 661, and flow paths 643,644.

The seventh channel 27 is a channel through which the second liquid 82 flows, and connects the heat pump device 13 and the gas vaporization equipment 14 . The seventh channel 27 includes channels 671 and 672 . The eighth channel 28 is a channel through which the first liquid 81 flows, and connects the water-air heat exchange unit 12 and the gas vaporization equipment 14 . The eighth channel 28 includes channels 621 , 622 , 623 , a channel 681 and a channel 672 .

The ninth flow path 29 is a flow path through which the second liquid 82 after being used to vaporize the liquefied gas 142 in the gas vaporization equipment 14 flows, and connects the gas vaporization equipment 14 and the heat pump device 13 . The ninth channel 29 includes channels 691 and 692 . The tenth channel 30 connects the channel 642 and the gas vaporization equipment 14 . The tenth channel 30 includes a channel 691 and a channel 701 .

The underground heat exchanger 11 has two U tubes 111 and 112 buried underground. The lower end of each U-tube 111, 112 is formed in a U-shape. A first liquid 81 flows inside the U-tube. One end of each of U-tubes 111 and 112 is connected to channel 611 at connection point 401 . The other end of each of U-tubes 111 and 112 is connected to channel 644 at connection point 402 .

Channel 611 is connected to channel 612 and channel 651 at connection point 404 . The flow path 612 is connected to the flow paths 613 and 631 via the first motor-operated valve 31 . The first electric valve 31 is a three-way valve.

Channel 613 is connected to water-air heat exchange unit 12 . Channel 631 is connected to channel 621 and channel 622 at connection point 403 . Channel 621 is connected to water-air heat exchange unit 12 . The flow path 622 is connected to the flow path 623 and the flow path 661 via the third electric valve 33 . The third electric valve 33 is a three-way valve.

The flow path 623 is connected to the flow paths 624 and 681 via the fourth electric valve 34 . The fourth electric valve 34 is a three-way valve. Flow path 624 is connected to heat pump device 13 . Channel 681 is connected to channel 671 and channel 672 at connection point 406 .

Flow path 671 is connected to heat pump device 13 . The flow path 672 is connected to the gas vaporization equipment 14 .

The flow path 691 is connected to the gas vaporization equipment 14 . Channel 691 is connected to channel 692 and channel 701 at connection point 407 . Flow path 692 is connected to heat pump device 13 .

The flow path 701 is connected to the flow paths 641 and 642 via the fifth electric valve 35 . Flow path 641 is connected to heat pump device 13 . Channel 642 is connected to channel 643 and channel 661 at connection point 405 . The flow path 643 is connected to the flow paths 644 and 651 via the second motor operated valve 32 . The second motor operated valve 32 is a three-way valve.

When the first liquid 81 flows from the underground heat exchanger 11 to the water-air heat exchange unit 12 through the first flow path 21 (see arrow H1 in FIG. 1), the first motor operated valve 31 23 to flow the first liquid 81 from the underground heat exchanger 11 to the heat pump device 13 (see arrow H2 in FIG. 3). The first motor-operated valve 31 is a motor-operated valve, and switches the flow paths (second motor-operated valve 32, third motor-operated valve 33, fourth motor-operated valve 34, and fifth the valve 35 as well).

The second motor-operated valve 32 allows the first liquid 81 to flow from the heat pump device 13 to the underground heat exchanger 11 through the fourth flow path 24 (see arrow H4 in FIG. 1), and through the fifth flow path 25. to flow the first liquid 81 from the heat pump device 13 to the water-air heat exchange unit 12 (see arrow H3 in FIG. 4).

The third motor-operated valve 33 allows the first liquid 81 to flow from the water-air heat exchange unit 12 to the heat pump device 13 through the second flow path 22 (see arrow H5 in FIG. 1) and the sixth flow path 26. The first liquid 81 flows from the water-air heat exchange unit 12 to the underground heat exchanger 11 (see arrow H6 in FIG. 5).

The fourth electric valve 34 allows the first liquid 81 to flow from the water-air heat exchange unit 12 to the heat pump device 13 through the second flow path 22 (see arrow H5 in FIG. 1), and through the seventh flow path 27 When the second liquid 82 flows from the heat pump device 13 to the gas vaporization equipment 14 (see arrow H10 in FIG. 1), and when the first liquid flows from the water-air heat exchange unit 12 to the gas vaporization equipment 14 via the eighth flow path 28 81 (see arrow H7 in FIGS. 6 and 7).

The fifth electric valve 35 is operated when the second liquid 82 flows from the gas vaporization equipment 14 to the heat pump device 13 through the ninth flow path 29 (see arrow H8 in FIG. 1) and through the tenth flow path 30. , to flow the first liquid 81 from the gas vaporization equipment 14 to the underground heat exchanger 11 or the water-air heat exchange unit 12 (see arrow H9 in FIG. 6 and arrow H11 in FIG. 7).

The first pump 511 is provided in the channel 612 . The first pump 511 causes the first liquid 81 to flow under the control of the CPU 601 (see FIG. 2), which will be described later. A second pump 512 is provided in the flow path 672 . The second pump 512 causes the first liquid 81 or the second liquid 82 to flow under the control of the CPU 601 (see FIG. 2).

A first temperature sensor 521 is provided in the flow path 612 . The first temperature sensor 521 outputs a signal corresponding to the temperature of the first liquid 81 flowing through the first channel 21 or the third channel 23 to the CPU 601 . The CPU 601 acquires the temperature of the first liquid 81 flowing through the first flow path 21 or the third flow path 23 based on the output of the first temperature sensor 521 .

The second temperature sensor 522 is provided in the gas vaporization system 1 at a position where the outside air temperature can be detected. The second temperature sensor 522 outputs a signal corresponding to the outside air temperature to the CPU 601 . The CPU 601 obtains the outside air temperature based on the output of the second temperature sensor 522 .

Third temperature sensor 523 is provided in channel 643 . The third temperature sensor 523 outputs a signal corresponding to the temperature of the first liquid 81 flowing through the fourth flow path 24, the fifth flow path 25, or the sixth flow path 26 to the CPU601. The CPU 601 acquires the temperature of the first liquid 81 flowing through the fourth flow path 24 , the fifth flow path 25 or the sixth flow path 26 based on the output of the third temperature sensor 523 .

A fourth temperature sensor 524 is provided in the flow path 672 . The fourth temperature sensor 524 outputs a signal corresponding to the temperature of the second liquid 82 flowing through the seventh channel 27 or the temperature of the first liquid 81 flowing through the eighth channel 28 to the CPU 601 . The CPU 601 acquires the temperature of the second liquid 82 flowing through the seventh flow path 27 or the temperature of the first liquid 81 flowing through the eighth flow path 28 based on the output of the fourth temperature sensor 524 .

A fifth temperature sensor 525 is provided in the flow path 622 . The fifth temperature sensor 525 outputs a signal corresponding to the temperature of the first liquid 81 flowing through the second channel 22 or the third channel 23 to the CPU 601 . The CPU 601 obtains the temperature of the first liquid 81 flowing through the second flow path 22 or the third flow path 23 based on the output of the fifth temperature sensor 525 .

A flow meter 541 is provided in the flow path 643 . Flow meter 541 outputs a signal corresponding to the flow rate of first liquid 81 flowing through channel 643 to CPU 601 . The CPU 601 detects the flow rate of the first liquid 81 flowing through the channel 643 based on the output of the flow meter 541 .

An electrical configuration of the gas vaporization system 1 will be described with reference to FIG. The control unit 60 is provided on a control panel (not shown). The control unit 60 includes a CPU 601, a ROM 602, a RAM 603, and the like.

A CPU 601 controls the gas vaporization system 1 . CPU 601 is electrically connected to ROM 602 and RAM 603 . The ROM 602 stores various program data such as a program for main processing (see FIG. 8), which will be described later. Various temporary data are stored in the RAM 603 .

The CPU 601 is electrically connected to the gas vaporization equipment 14 . The CPU 601 controls the gas vaporization equipment 14 to vaporize the liquefied gas 142 in the liquefied gas container 141 . The CPU 601 sends the gas obtained by vaporizing the liquefied gas 142 to, for example, power generation equipment. The gas is used for power generation and the like.

The CPU 601 is electrically connected to the heat pump device 13 . The CPU 601 controls the heat pump device 13 . The CPU 601 controls the heat pump device 13 and performs heat exchange between the first liquid 81 and the second liquid 82 by the heat pump method. In this embodiment, the heat pump device 13 uses the temperature of the first liquid 81 to heat the second liquid 82 .

In this embodiment, as an example, the water-air heat exchange unit 12 (see FIG. 1) exchanges heat between the first liquid 81 and air by natural convection heat exchange without using a drive source such as a fan. In this case, the water-air heat exchange unit 12 may not be electrically connected to the CPU 601 . Note that the water-air heat exchange unit 12 may perform heat exchange between the first liquid 81 and the air by forced convection heat exchange in which heat is forcibly exchanged using a fan or the like. In this case, the water-air heat exchange unit 12 is electrically connected to the CPU 601 . The CPU 601 drives the water-air heat exchange unit 12 when the first liquid 81 is passed through the water-air heat exchange unit 12, and when the first liquid 81 is not passed through the water-air heat exchange unit 12, the water - the air heat exchange unit 12 may be turned off;

The CPU 601 is electrically connected to the operation unit 609 . The CPU 601 acquires instructions from the user input from the operation unit 609 .

The CPU 601 controls the first electric valve 31, the second electric valve 32, the third electric valve 33, the fourth electric valve 34, the fifth electric valve 35, the first pump 511, the second pump 512, the flow meter 541, the first temperature It is electrically connected to sensor 521 , second temperature sensor 522 , third temperature sensor 523 , fourth temperature sensor 524 and fifth temperature sensor 525 . The CPU 601 controls the first electric valve 31, the second electric valve 32, the third electric valve 33, the fourth electric valve 34, and the fifth electric valve 35 to switch the flow path.

In this embodiment, as an example, the first pump 511 and the second pump 512 are assumed to be pumps (for example, inverter pumps) capable of adjusting the flow rate of the first liquid 81 or the second liquid 82 . The CPU 601 controls the flow rates of the first pump 511 and the second pump 512 . For example, the CPU 601 refers to the outputs of the first temperature sensor 521, the second temperature sensor 522, the third temperature sensor 523, the fourth temperature sensor 524, and the fifth temperature sensor 525, and the first pump 511 and the second pump Adjust the flow rate of the first liquid 81 or the second liquid 82 by 512 .

The flow of the first liquid 81 and the second liquid 82 in the gas vaporization system 1 will be explained. In this embodiment, the CPU 601 controls the first electric valve 31, the second electric valve 32, the third electric valve 33, the fourth electric valve 34, and the fifth electric valve 35 to The channel through which the two liquids 82 flow is switched. As a result, the state of the gas vaporization system 1 is changed to a first state (see FIG. 1), a second state (see FIG. 3), a third state (see FIG. 4), a fourth state (see FIG. 5), and a fifth state. (see FIG. 6), and a sixth state (see FIG. 7).

In the following description, the temperature of the first liquid 81 flowing through the first channel 21 or the third channel 23 is called "first temperature". The temperature of the outside air is called "second temperature". The temperature of the first liquid 81 flowing through the fourth channel 24 is called "third temperature". The temperature of the first liquid 81 flowing through the first flow path 21 while the first liquid 81 is flowing through the underground heat exchanger 11 is referred to as "fourth temperature". The temperature of the first liquid 81 flowing through the second channel 22 or the eighth channel 28 is called "fifth temperature".

A case of setting the gas vaporization system 1 to the first state will be described with reference to FIG. The first state is, for example, spring, summer, autumn, and daytime, when the temperature is high, the first liquid 81 can be heated in the water-air heat exchange unit 12, and the ground is warmed by the first liquid 81. Set if possible. The first state heats the first liquid 81 in the water-air heat exchange unit 12, uses the temperature of the heated first liquid 81 to heat the second liquid 82 in the heat pump device 13, and heats the heat pump device 13. The temperature of the first liquid 81 after being used for exchange is used to warm the ground in the underground heat exchanger 11 .

As shown in FIG. 1 , in the first state, the first liquid 81 circulates through the underground heat exchanger 11 , the water-air heat exchange unit 12 and the heat pump device 13 . The first liquid 81 flows from the underground heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 (see arrow H1). In the water-air heat exchange unit 12, heat exchange takes place between the first liquid 81 and air. In this embodiment, when the first state continues, the first liquid 81 is heated in the water-air heat exchange unit 12 .

The first liquid 81 flows from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22 (see arrow H5). In the heat pump device 13, heat exchange is performed between the first liquid 81 and the second liquid 82 by a heat pump method, and the second liquid 82 is heated.

The second liquid 82 heated in the heat pump device 13 flows through the seventh flow path 27 to the gas vaporization facility 14 (see arrow H10). The temperature of the second liquid 82 is used to vaporize the liquefied gas 142 in the liquefied gas container 141 . The second liquid 82 used to vaporize the liquefied gas 142 flows through the ninth flow path 29 to the heat pump device 13 (see arrow H8) and is heated in the heat pump device 13 . That is, the second liquid 82 circulates between the heat pump device 13 and the gas vaporization equipment 14 .

On the other hand, the first liquid 81 used for heating the second liquid 82 in the heat pump device 13 flows to the underground heat exchanger 11 via the fourth flow path 24 (see arrow H4). In this embodiment, when the first state continues, in the underground heat exchanger 11, the first liquid 81 is cooled and the ground is warmed. For example, in the second state (see FIG. 3), if the state in which the first liquid 81 is heated in the underground heat exchanger 11 continues, underground heat continues to be taken. As a result, the ground may be in a so-called "heat withered" state. In order to reduce the possibility of this "heat exhaustion" state, in the first state, the heat of the first liquid 81 remaining after being heated in the water-air heat exchange unit 12 and heat-exchanged in the heat pump device 13 is is used to warm the underground in the underground heat exchanger 11.

In the first state, as an example, the first liquid 81 changes from 7 degrees to 15 degrees in the water-air heat exchange unit 12, changes from 15 degrees to 10 degrees in the heat pump device 13, and heats the ground. At exchanger 11 it changes from 10 degrees to 7 degrees. Also, as an example, the second liquid 82 changes from 15 degrees to 25 degrees in the heat pump device 13 and changes from 25 degrees to 15 degrees in the gas vaporization equipment 14 .

A case of setting the gas vaporization system 1 to the second state will be described with reference to FIG. The second state is, for example, in winter and at night when the temperature is low and the water-air heat exchange unit 12 cannot heat the first liquid 81, and the underground heat exchanger 11 heats the first liquid 81. set if possible. In the second state, the first liquid 81 is heated in the underground heat exchanger 11, the temperature of the heated first liquid 81 is used to heat the second liquid 82 in the heat pump device 13, and the second liquid 82 is liquefied. This is the state used to vaporize the gas 142 . In the second state, no heating of the first liquid 81 in the water-air heat exchange unit 12 takes place. This is because it is difficult to heat the first liquid 81 in the water-air heat exchange unit 12 when the temperature is low, such as in winter or at night.

As shown in FIG. 3 , in the second state, the first liquid 81 circulates between the underground heat exchanger 11 and the heat pump device 13 . In the underground heat exchanger 11, heat exchange is performed between the first liquid 81 and underground heat. In this embodiment, when the second state continues, the first liquid 81 is heated in the underground heat exchanger 11 .

The first liquid 81 flows from the underground heat exchanger 11 to the heat pump device 13 via the third channel 23 (see arrow H2). Since the water-air heat exchange unit 12 is bypassed by the third flow path 23 , the first liquid 81 does not flow through the water-air heat exchange unit 12 .

In the heat pump device 13, heat exchange is performed between the first liquid 81 and the second liquid 82 by a heat pump method, and the second liquid 82 is heated. As in the first state, the second liquid 82 circulates between the heat pump device 13 and the gas vaporization facility 14 and is used to vaporize the liquefied gas 142 stored in the liquefied gas container 141 .

The first liquid 81 after being used for heat exchange in the heat pump device 13 flows through the fourth flow path 24 to the underground heat exchanger 11 (see arrow H4). The first liquid 81 is heated in the underground heat exchanger 11 . In the second state, as an example, the first liquid 81 changes from 0 degrees to 5 degrees in the underground heat exchanger 11 and changes from 5 degrees to 0 degrees in the heat pump device 13 . Also, as an example, the second liquid 82 changes from 15 degrees to 25 degrees in the heat pump device 13 and changes from 25 degrees to 15 degrees in the gas vaporization equipment 14 .

A case where the gas vaporization system 1 is set to the third state will be described with reference to FIG. The third state is, for example, spring, summer, autumn, and daytime, when the air temperature is high and the first liquid 81 can be heated in the water-air heat exchange unit 12, and the first liquid 81 warms the ground. set if it is not possible. The third state heats the first liquid 81 in the water-air heat exchange unit 12, uses the temperature of the heated first liquid 81 to heat the second liquid 82 in the heat pump device 13, and heats the second liquid 82. This is the state used for vaporizing the liquefied gas 142 . In the third state, heat exchange by the underground heat exchanger 11 is not performed.

As shown in FIG. 4, in the third state the first liquid 81 circulates between the water-air heat exchange unit 12 and the heat pump device 13 . In the water-air heat exchange unit 12, heat exchange takes place between the first liquid 81 and air. In this embodiment, when the third state continues, the first liquid 81 is heated in the water-air heat exchange unit 12 .

The first liquid 81 flows from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22 (see arrow H5). In the heat pump device 13, heat exchange is performed between the first liquid 81 and the second liquid 82 by a heat pump method, and the second liquid 82 is heated. As in the first state (see FIG. 1), the second liquid 82 circulates between the heat pump device 13 and the gas vaporizer 14 and is used to vaporize the liquefied gas 142 in the liquefied gas container 141 .

After being used for heat exchange in the heat pump device 13, the first liquid 81 flows to the water-air heat exchange unit 12 via the fifth channel 25 (see arrow H3). The first liquid 81 is heated in the water-air heat exchange unit 12 . Since the underground heat exchanger 11 is bypassed by the fifth flow path 25 , the first liquid 81 does not flow through the underground heat exchanger 11 . In the third state, as an example, the first liquid 81 changes from 5 degrees to 10 degrees in the water-air heat exchange unit 12 and changes from 10 degrees to 5 degrees in the heat pump device 13 . Also, as an example, the second liquid 82 changes from 15 degrees to 25 degrees in the heat pump device 13 and changes from 25 degrees to 15 degrees in the gas vaporization equipment 14 .

A case where the gas vaporization system 1 is set to the fourth state will be described with reference to FIG. The fourth state is, for example, spring, summer, autumn, and daytime, when the air temperature is high and the first liquid 81 can be heated in the water-air heat exchange unit 12, and the temperature of the first liquid 81 is liquefied. Set when not used for gas 142 vaporization. The fourth state uses the heat of the first liquid 81 heated in the water-air heat exchange unit 12 to reduce the possibility of so-called "heat starvation" in the ground, and the ground heat exchanger 11 is a state of warming the ground.

In the fourth state, the first liquid 81 circulates through the underground heat exchanger 11 and the water-air heat exchange unit 12, as shown in FIG. In the water-air heat exchange unit 12, heat exchange takes place between the first liquid 81 and air. In this embodiment, when the fourth state continues, the first liquid 81 is heated in the water-air heat exchange unit 12 .

The first liquid 81 flows from the water-air heat exchange unit 12 to the underground heat exchanger 11 via the sixth flow path 26 (see arrow H6). In this embodiment, when the fourth state continues, in the underground heat exchanger 11, the first liquid 81 is cooled and the ground is warmed. The first liquid 81 flows from the underground heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 (see arrow H1). In the fourth state, as an example, the first liquid 81 changes from 12 degrees to 15 degrees in the water-air heat exchange unit 12 and changes from 15 degrees to 12 degrees in the underground heat exchanger 11 .

A case where the gas vaporization system 1 is set to the fifth state (see FIG. 6) and a case where it is set to the sixth state (see FIG. 7) will be described with reference to FIGS. The fifth state and sixth state are when the temperature of the first liquid 81 heated in the water-air heat exchange unit 12 is equal to or higher than the vaporization temperature, which is the temperature at which the liquefied gas 142 can be vaporized in the gas vaporization equipment 14. , the first liquid 81 is supplied to the gas vaporization equipment 14 to vaporize the liquefied gas 142 . The vaporization temperature may be set to any value as long as it is equal to or higher than the temperature at which the liquefied gas 142 can be vaporized. The vaporization temperature is stored in ROM602. The vaporization temperature is, for example, 25 degrees.

The fifth state is, for example, spring, summer, autumn, and daytime, when the temperature is high, the first liquid 81 can be heated in the water-air heat exchange unit 12, and the liquefied gas 142 can be vaporized by the first liquid 81; It is set when the ground can be warmed by the first liquid 81 . As shown in FIG. 6, in the fifth state, the first liquid 81 circulates through the underground heat exchanger 11, the water-air heat exchange unit 12, and the gas vaporizer . The first liquid 81 flows from the underground heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 (see arrow H1). In the water-air heat exchange unit 12, heat exchange takes place between the first liquid 81 and air. In this embodiment, when the fifth state continues, the first liquid 81 is heated in the water-air heat exchange unit 12 .

The first liquid 81 flows from the water-air heat exchange unit 12 to the gas vaporization facility 14 via the eighth flow path 28 (see arrow H7). The temperature of the first liquid 81 is used to vaporize the liquefied gas 142 in the liquefied gas container 141 . The first liquid 81 used for vaporizing the liquefied gas 142 flows through the tenth flow path 30 and the flow paths 642, 643, 644 to the underground heat exchanger 11 (see arrow H9). In this embodiment, when the fifth state continues, in the underground heat exchanger 11, the first liquid 81 is cooled and the ground is warmed. This reduces the potential for so-called "heat blight" in the soil. In the fifth state, as an example, the first liquid 81 changes from 13 degrees to 25 degrees in the water-air heat exchange unit 12, changes from 25 degrees to 15 degrees in the gas vaporization equipment 14, and It changes from 15 degrees to 13 degrees in the heat exchanger 11 .

The sixth state is, for example, spring, summer, autumn, and daytime, when the temperature is high, the first liquid 81 can be heated in the water-air heat exchange unit 12, and the liquefied gas 142 can be vaporized by the first liquid 81, It is set when the ground cannot be warmed by the first liquid 81 . As shown in FIG. 7, in the sixth state, the first liquid 81 circulates between the water-air heat exchange unit 12 and the gas vaporization equipment 14 . In the water-air heat exchange unit 12, heat exchange takes place between the first liquid 81 and air. In this embodiment, when the sixth state continues, the first liquid 81 is heated in the water-air heat exchange unit 12 .

The first liquid 81 flows from the water-air heat exchange unit 12 to the gas vaporization facility 14 via the eighth flow path 28 (see arrow H7). The temperature of the first liquid 81 is used to vaporize the liquefied gas 142 in the liquefied gas container 141 . The first liquid 81 used to vaporize the liquefied gas 142 flows to the water-air heat exchange unit 12 via the tenth flow path 30, flow paths 642, 643, flow path 651, and flow paths 612, 613. (See arrow H11). In the sixth state, as an example, the first liquid 81 changes from 15 degrees to 25 degrees in the water-air heat exchange unit 12 and changes from 25 degrees to 15 degrees in the gas vaporization equipment 14 .

Main processing by the CPU 601 will be described with reference to FIGS. When the gas vaporization system 1 is powered on, the CPU 601 reads a main processing program from the ROM 602 and loads it in the RAM 603 . The CPU 601 performs main processing according to a main processing program.

In the main process, it is determined whether or not a vaporization start instruction has been input via the operation unit 609 (see FIG. 2) (S11). The vaporization start instruction is an instruction to start vaporizing the liquefied gas 142 . If no vaporization start instruction has been input (S11: NO), it is determined whether or not an instruction to set the fourth state (see FIG. 5) has been input via the operation unit 609 (S12). If an instruction to set the fourth state has not been input (S12: NO), it is determined whether or not an instruction to end the fourth state has been input via the operation unit 609 (S13). If an instruction to end the fourth state has not been input (S13: NO), the process returns to S11.

When the vaporization start instruction is input (S11: YES), vaporization of the liquefied gas 142 is started (S14). In this embodiment, as an example, it is assumed that the gas vaporization system 1 is set to the first state (see FIG. 1) in S14.

When set to the first state (see FIG. 1), the CPU 601 controls the first motor-operated valve 31 to supply the first water from the underground heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21. The liquid 81 is set to flow (see arrow H1 in FIG. 1). Further, the CPU 601 controls the third motor-operated valve 33 and the fourth motor-operated valve 34 so that the first liquid 81 flows from the water-air heat exchange unit 12 to the heat pump device 13 through the second flow path 22. set (see arrow H5 in FIG. 1). In addition, the CPU 601 controls the second motor-operated valve 32 and the fifth motor-operated valve 35 so that the first liquid 81 flows from the heat pump device 13 to the underground heat exchanger 11 through the fourth flow path 24. (see arrow H4 in FIG. 1). The CPU 601 drives the heat pump device 13, the gas vaporization equipment 14, the first pump 511, and the second pump 512 to start vaporizing the liquefied gas 142 in the first state.

Next, the CPU 601 waits for a predetermined time (S15). This standby is performed to wait until the temperatures of the first liquid 81 and the second liquid 82 in each channel are stabilized. Although not specifically described below, when the state changes between the first state to the sixth state, standby processing is performed until the temperatures of the first liquid 81 and the second liquid 82 in each channel stabilize. may be broken.

Next, a first temperature is acquired based on the output of the first temperature sensor 521 (S16). Next, based on the output of the second temperature sensor 522, a second temperature, which is the outside air temperature, is obtained (S17). Next, it is determined whether or not the first temperature acquired in S16 is lower than the second temperature acquired in S17 (S18).

If the first temperature is lower than the second temperature (S18: YES), the first motor operated valve 31 is controlled to allow the first liquid to flow from the underground heat exchanger 11 to the water-air heat exchange unit 12 through the first flow path 21. 81 is flowed (see arrow H1 in FIG. 1) (S19). If the first liquid 81 is already flowing from the underground heat exchanger 11 to the water-air heat exchange unit 12 through the first channel 21, this state continues.

Next, as shown in FIG. 9, a third temperature is acquired based on the output of the third temperature sensor 523 (S31). Next, a fourth temperature is acquired based on the output of the first temperature sensor 521 (S32). It is determined whether or not the third temperature acquired in S31 is higher than the fourth temperature acquired in S32 (S33).

When the third temperature is higher than the fourth temperature (S33: YES), the second motor-operated valve 32 is controlled to allow the first liquid 81 to flow from the heat pump device 13 to the underground heat exchanger 11 through the fourth flow path 24. The state in which the data is displayed is maintained (S34). A fifth temperature is then obtained based on the output of the fifth temperature sensor 525 (S36). Next, it is determined whether or not the fifth temperature acquired in S36 is lower than the vaporization temperature (S37).

When the fifth temperature is lower than the vaporization temperature (S37: YES), the fourth electric valve 34 is controlled, and the first liquid 81 is supplied from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22. The second liquid 82 is flowed (see arrow H5 in FIG. 1) from the heat pump device 13 to the gas vaporization equipment 14 through the seventh flow path 27 (see arrow H10 in FIG. 1) (S38). In this case, heat is exchanged between the first liquid 81 and the second liquid 82 in the heat pump device 13 to heat the second liquid 82 . The heated second liquid 82 flows from the heat pump device 13 to the gas vaporization equipment 14 via the seventh flow path 27 , and the liquefied gas 142 is vaporized in the gas vaporization equipment 14 . Note that the first liquid 81 has already flowed from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22, and the heat pump device 13 to the gas vaporization equipment 14 via the seventh flow path 27. If the second liquid 82 is flowing, this state is continued.

Next, the fifth electric valve 35 is controlled to flow the second liquid 82 from the gas vaporization equipment 14 to the heat pump device 13 through the ninth passage 29 (see arrow H8 in FIG. 1) (S39). The fifth electric valve 35 is set so that the first liquid 81 flows from the flow path 641 to the flow path 642, and the second liquid 82 does not flow from the tenth flow path 30 to the flow path 642. set. If the second liquid 82 is already flowing from the gas vaporization equipment 14 to the heat pump device 13 through the ninth flow path 29, this state continues.

Next, the heat pump device 13 is driven (S40). If the heat pump device 13 has already been driven, the heat pump device 13 continues to be driven.

Next, as shown in FIG. 10, it is determined whether or not the first liquid 81 is flowing through the underground heat exchanger 11 (S51). In the case of the first state (see FIG. 1), the second state (see FIG. 3), the fourth state (see FIG. 5), and the fifth state (see FIG. 6), the underground heat exchanger 11 is supplied with the first liquid 81 is flowing. If the first liquid 81 is flowing through the underground heat exchanger 11 (S51: YES), it is determined whether or not an instruction to stop vaporization has been input via the operation unit 609 (S55). The vaporization stop instruction is an instruction to stop the operation of vaporizing the liquefied gas 142 . If the vaporization stop instruction has not been input (S55: NO), the process returns to S16 of FIG. When the above processing is executed, the first state is maintained.

Next, a case where the first state (see FIG. 1) is switched to the second state (see FIG. 3) will be described as an example. When the air temperature is low, such as in winter or at night, the underground temperature becomes higher than the air temperature, and the first temperature becomes higher than the second temperature. In this case, in S18, it is determined that the first temperature is not lower than the second temperature (S18: NO), the first electric valve 31 is controlled, and the heat pump is discharged from the underground heat exchanger 11 via the third flow path 23. The first liquid 81 is caused to flow through the device 13 (see arrow H2 in FIG. 3) (S20). This changes from the first state (see FIG. 1) to the second state (see FIG. 3). That is, no first liquid 81 is supplied to the water-air heat exchange unit 12 . If the first liquid 81 is already flowing from the underground heat exchanger 11 to the heat pump device 13 through the third flow path 23, this state continues.

The process then proceeds to S55 (see FIG. 10). In the second state, if the first temperature becomes lower than the second temperature (S18: YES), the first state (see FIG. 1) is set (S19).

Next, the case of switching from the first state (see FIG. 1) to the third state (see FIG. 4) will be described. When the third temperature becomes equal to or lower than the fourth temperature, the underground heat exchanger 11 cannot warm the underground. Therefore, the third state is set in which the first liquid 81 is not circulated through the underground heat exchanger 11 .

When the third temperature becomes equal to or lower than the fourth temperature, it is determined in S33 that the third temperature is not higher than the fourth temperature (S33: NO), the second motor-operated valve 32 is controlled, and the heat pump is supplied through the fifth flow path 25. The first liquid 81 is flowed from the device 13 to the water-air heat exchange unit 12 (see arrow H3 in FIG. 4) (S35). This switches from the first state (see FIG. 1) to the third state (see FIG. 4). Therefore, the underground heat exchanger 11 is not supplied with the first liquid 81 . If the first liquid 81 is already flowing from the heat pump device 13 to the water-air heat exchange unit 12 through the fifth channel 25, this state continues.

The process then proceeds to S36. When the third state is set, in S51 (see FIG. 10), it is determined that the first liquid 81 is not flowing through the underground heat exchanger 11 (S51: NO), It is determined whether or not an instruction to flow the first liquid 81 to the middle heat exchanger 11 has been input (S52). If an instruction to flow the first liquid 81 through the underground heat exchanger 11 has not been input (S52: NO), it is determined whether an instruction to stop vaporization has been input via the operation unit 609 (S53). If the vaporization stop instruction has not been input (S53: NO), the process returns to S36 (see FIG. 9). This maintains the third state (see FIG. 4).

When the instruction to flow the first liquid 81 to the underground heat exchanger 11 is input (S52: YES), the second electric valve 32 is controlled to flow the first liquid 81 to the underground heat exchanger 11 (Fig. 1 arrow H4) (S54). This switches from the third state (see FIG. 4) to the first state (see FIG. 1). The process then proceeds to S55.

A case of switching from the first state (see FIG. 1) to a fifth state (see FIG. 6) and a case of switching from the third state (see FIG. 4) to the sixth state (see FIG. 7) will be described. If the fifth temperature is equal to or higher than the vaporization temperature, it is determined in S37 that the fifth temperature is not lower than the vaporization temperature (S37: NO), the fourth motor operated valve 34 is controlled, and the water flows through the eighth passage 28. - The first liquid 81 is flowed from the air heat exchange unit 12 to the gas vaporization installation 14 (see arrow H7 in Figures 6 and 7) (S41). If the first liquid 81 is already flowing from the water-air heat exchange unit 12 to the gas vaporization equipment 14 through the eighth passage 28, this state continues.

Next, the fifth electric valve 35 is controlled to flow the first liquid 81 from the gas vaporization equipment 14 to the flow path 642 through the tenth flow path 30 (see arrow H9 in FIG. 6 and arrow H11 in FIG. 7). (S42). If the first liquid 81 is already flowing from the gas vaporization equipment 14 to the flow path 642 via the tenth flow path 30, this state continues.

Next, the heat pump device 13 is stopped (S43). In addition, when the heat pump device 13 has already stopped, this state is continued. If it is in the first state (see FIG. 1), it is switched to the fifth state (see FIG. 6) by S41 and S42. Moreover, when it is the third state (see FIG. 4), it is switched to the sixth state (see FIG. 7) by S41 and S42. That is, in S42, the fifth motor-operated valve 35 is controlled, and the first liquid 81 flows from the gas vaporization equipment 14 to the underground heat exchanger 11 or the water-air heat exchange unit 12 through the tenth flow path 30. be The process then proceeds to S51 in FIG.

In the fifth state (see FIG. 6) or the sixth state (see FIG. 7), if the fifth temperature becomes lower than the vaporization temperature (S37: YES), the processes of S38 to S40 are executed. This switches from the fifth state (see FIG. 6) to the first state (see FIG. 1). Also, the sixth state (see FIG. 7) is switched to the third state (see FIG. 4).

In S55, when the vaporization stop instruction is input (S55: YES), the vaporization of the liquefied gas 142 is stopped (S56). Also, in S53, if a vaporization stop instruction is input (S53: YES), vaporization of the liquefied gas 142 is stopped (S56). In S56, for example, the driving of the first pump 511, the second pump 512, the heat pump device 13, and the gas vaporization equipment 14 is stopped. The process then returns to S11 (see FIG. 8).

In the state where the vaporization of the liquefied gas 142 is stopped, if an instruction to set the fourth state (see FIG. 5) is input (S12: YES), at least the third electric valve 33 is controlled, and the sixth flow path The first liquid 81 is set to flow from the water-air heat exchange unit 12 to the underground heat exchanger 11 via 26 (see arrow H6 in FIG. 5) (S21). In this embodiment, the second motor-operated valve 32 is also controlled so that the first liquid 81 flows from the channel 643 to the channel 644 (S21).

Next, the first motor operated valve 31 is controlled to set the first liquid 81 to flow from the underground heat exchanger 11 to the water-air heat exchange unit 12 via the first flow path 21 (arrow H1) (S22). Next, the first pump 511 is driven to flow the first liquid 81 (S23). Through the processes of S21 to S23, the gas vaporization system 1 is set to the fourth state (see FIG. 5). The process then returns to S11.

If an instruction to end the fourth state is input (S13: YES), driving of the first pump 511 is stopped, and the flow of the first liquid 81 is stopped in the fourth state (S24). The process then returns to S11.

As described above, the processing in this embodiment is executed. In this embodiment, the first electric valve 31 allows the first liquid 81 to flow from the underground heat exchanger 11 to the water-air heat exchange unit 12 through the first flow path 21 (see arrow H1 in FIG. 1). , and the case where the first liquid 81 flows from the underground heat exchanger 11 to the heat pump device 13 via the third flow path 23 (see arrow H2 in FIG. 3). Therefore, for example, when the air temperature is low and the water-air heat exchange unit 12 cannot heat the first liquid 81, such as in winter and at night, the underground heat exchanger 11 heats the first liquid 81 and heats it. A first liquid 81 can flow from the underground heat exchanger 11 to the heat pump device 13 via the third flow path 23 (see FIG. 3). The temperature of the first liquid 81 can then be used in the heat pump device 13 to heat the second liquid 82 . The heated second liquid 82 can then flow through the gas vaporizer 14 and be used to vaporize the liquefied gas 142 . Also, for example, in spring, summer, autumn, and daytime, when the temperature is high and the first liquid 81 can be heated in the water-air heat exchange unit 12, the heat exchanged in the underground heat exchanger 11 One liquid 81 can flow through the first flow path 21 to the water-air heat exchange unit 12 to heat the first liquid 81 in the water-air heat exchange unit 12 (see FIG. 1). . The temperature of the first liquid 81 can then be used in the heat pump device 13 to heat the second liquid 82 . The heated second liquid 82 can then flow through the gas vaporizer 14 and be used to vaporize the liquefied gas 142 . Thus, the gas vaporization system 1 can vaporize the liquefied gas throughout the year using the heat pump method. Therefore, a heat pump system can be used for the gas vaporization system 1 . Also, by using the heat pump method, the cost can be reduced as compared with the case where the second liquid 82 is heated by burning the fuel in a boiler device, for example.

Also, a first temperature is acquired (S16) and a second temperature is acquired (S17). If the first temperature is lower than the second temperature (S18: YES), the first motor operated valve 31 is controlled to allow the first liquid to flow from the underground heat exchanger 11 to the water-air heat exchange unit 12 through the first flow path 21. 81 is passed (S19). The first liquid 81 can be heated in the water-air heat exchange unit 12 if the first temperature is lower than the second temperature, which is the temperature of the outside air. Therefore, the first liquid 81 is caused to flow through the water-air heat exchange unit 12 to heat the first liquid 81 . On the other hand, when the first temperature is not lower than the second temperature (S18: NO), the first liquid 81 flows from the underground heat exchanger 11 to the heat pump device 13 through the third flow path 23 (S20). When the first temperature is equal to or higher than the second temperature, which is the temperature of the outside air, it is difficult to heat the first liquid 81 in the water-air heat exchange unit 12 . Therefore, the first liquid 81 is not flowed to the water-air heat exchange unit 12, but is flowed directly from the underground heat exchanger 11 to the heat pump device 13. Thus, depending on the relationship between the first temperature and the second temperature, when the first liquid 81 flows from the underground heat exchanger 11 to the water-air heat exchange unit 12 through the first flow path 21 (see FIG. 1 ) and the case where the first liquid 81 flows from the underground heat exchanger 11 to the heat pump device 13 via the third flow path 23 (see FIG. 3) are automatically switched. Therefore, it is not necessary for the user to manually switch the flow path, and the user's convenience is improved.

The fourth flow path 24 is a flow path through which the first liquid 81 after being used for heat exchange in the heat pump device 13 flows, and is a flow path connecting the heat pump device 13 and the underground heat exchanger 11. . By providing the fourth flow path 24 , the first liquid 81 after being used for heat exchange in the heat pump device 13 can flow to the underground heat exchanger 11 . Therefore, for example, when the underground temperature is higher than the first liquid 81 , the first liquid 81 can be flowed from the heat pump device 13 to the underground heat exchanger 11 to heat the first liquid 81 . Further, for example, when the underground temperature is lower than the first liquid 81, the first liquid 81 is flowed from the heat pump device 13 to the underground heat exchanger 11, the underground is warmed in the underground heat exchanger 11, and the ground is warmed. It is possible to reduce the possibility of the inside becoming so-called "withered by heat".

The fifth flow path 25 is a flow path through which the first liquid 81 after being used for heat exchange in the heat pump device 13 flows, and is a flow path connecting the heat pump device 13 and the water-air heat exchange unit 12. be. Then, the second motor-operated valve 32 is operated when the first liquid 81 flows from the heat pump device 13 to the underground heat exchanger 11 through the fourth flow path 24 (see FIG. 1) and through the fifth flow path 25. The flow of the first liquid 81 from the heat pump device 13 to the water-air heat exchange unit 12 (see FIG. 4) is switched. That is, switching between the case where the first liquid 81 is allowed to flow through the underground heat exchanger 11 and the case where the first liquid 81 is not allowed to flow can be switched. Therefore, for example, the first liquid 81 is supplied to the underground heat exchanger 11 only when the first liquid 81 that has flowed out from the heat pump device 13 to the fourth flow path 24 has a temperature enough to warm the underground. By flushing, it is possible to reduce the possibility that the ground will become so-called "heat withered".

Further, when the third temperature is higher than the fourth temperature (S33: YES), the second motor-operated valve 32 is controlled, and the first liquid 81 is supplied from the heat pump device 13 to the underground heat exchanger 11 via the fourth flow path 24. is played (S34). If the third temperature is not greater than the fourth temperature (S33: NO), the second motor operated valve 32 is controlled to flow the first liquid 81 from the heat pump device 13 to the water-air heat exchange unit 12 through the fifth passage 25. is played (S35). When the third temperature is higher than the fourth temperature, the first liquid 81 that has flowed from the heat pump device 13 into the underground heat exchanger 11 through the fourth flow path 24 is cooled in the underground heat exchanger 11 and It is in a state of flowing out to one channel 21 . That is, the underground heat exchanger 11 uses the temperature of the first liquid 81 to heat the underground. When the ground is warmed in the underground heat exchanger 11, the first liquid 81 flows from the heat pump device 13 to the underground heat exchanger 11 through the fourth flow path 24 (S34). It is possible to reduce the possibility that the inside will be in a so-called "withered with heat" state. On the other hand, when the third temperature is equal to or lower than the fourth temperature, the first liquid 81 that has flowed into the underground heat exchanger 11 from the heat pump device 13 through the fourth flow path 24 is heated in the underground heat exchanger 11. It is in a state in which the liquid is discharged to the first flow path 21. Therefore, in the underground heat exchanger 11, the first liquid 81 is taking heat from underground. When the first liquid 81 takes heat from the ground, the first liquid 81 flows from the heat pump device 13 to the water-air heat exchange unit 12 through the fifth flow path 25 (S35). No first liquid 81 is allowed to flow through the heat exchanger 11 . Therefore, it is possible to reduce the possibility that the heat in the ground is taken away in the underground heat exchanger 11 and the ground is in a state of so-called "heat exhaustion".

Further, the sixth flow path 26 is a flow path through which the first liquid 81 after heat exchange in the water-air heat exchange unit 12 flows, and the water-air heat exchange unit 12 and the underground heat exchanger 11 It is a channel that connects The third electric valve 33 is used when the first liquid 81 flows from the water-air heat exchange unit 12 to the heat pump device 13 through the second flow path 22 (see FIG. 1), and when the water flows through the sixth flow path 26. - Switching from the case where the first liquid 81 flows from the air heat exchange unit 12 to the underground heat exchanger 11 (see FIG. 5). Therefore, when the first liquid 81 flows from the water-air heat exchange unit 12 to the heat pump device 13 through the second flow path 22, the temperature of the first liquid 81 heated in the water-air heat exchange unit 12 is used. Thus, the second liquid 82 can be heated in the heat pump device 13 . Further, when the first liquid 81 is flowed from the water-air heat exchange unit 12 to the underground heat exchanger 11, the temperature of the first liquid 81 heated in the water-air heat exchange unit 12 is used to exchange the underground heat. The earth can be warmed in the vessel 11 . Therefore, it is possible to reduce the possibility that the ground will be so-called "heat withered".

Further, when the vaporization of the liquefied gas 142 by the gas vaporization equipment 14 is stopped, the third electric valve 33 is controlled, and the water-air heat exchange unit 12 via the sixth flow path 26 to the underground heat exchanger 11 (see FIG. 5) (S21). Therefore, when the vaporization of the liquefied gas 142 by the gas vaporization equipment 14 is stopped, the temperature of the first liquid 81 heated in the water-air heat exchange unit 12 is used to You can warm inside. Therefore, it is possible to reduce the possibility that the ground will be so-called "heat withered".

In addition, the fourth electric valve 34 causes the first liquid 81 to flow from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22, and vaporize the gas from the heat pump device 13 via the seventh flow path 27. When the second liquid 82 flows to the equipment 14 (see FIGS. 1 and 4), and when the first liquid 81 flows from the water-air heat exchange unit 12 to the gas vaporization equipment 14 through the eighth flow path 28 (see FIG. 4) 6 and FIG. 7). Therefore, when the first liquid 81 flows from the water-air heat exchange unit 12 to the gas vaporization equipment 14 through the eighth flow path 28, the first liquid 81 heated in the water-air heat exchange unit 12 is used. , the liquefied gas 142 can be vaporized. Therefore, there is no need to drive the heat pump device 13, and the operating cost of the gas vaporization system 1 can be reduced.

Further, when the fifth temperature is lower than the vaporization temperature (S37: YES), the fourth electric valve 34 is controlled, and the first liquid 81 is transferred from the water-air heat exchange unit 12 to the heat pump device 13 via the second flow path 22. is flowed, and the second liquid 82 is flowed from the heat pump device 13 to the gas vaporization equipment 14 through the seventh flow path 27 (see FIGS. 1 and 4) (S38). If the fifth temperature is not lower than the vaporization temperature (S37: NO), the fourth motor-operated valve 34 is controlled to pass the first liquid 81 from the water-air heat exchange unit 12 to the gas vaporization facility 14 via the eighth passage 28. is flowed (see FIGS. 6 and 7) (S41). That is, when the fifth temperature is equal to or higher than the vaporization temperature, the first liquid 81 is automatically flowed to the gas vaporization equipment 14 and used to vaporize the liquefied gas 142 . Therefore, it is not necessary for the user to manually switch the flow path, and the user's convenience is improved.

In the above embodiment, the underground heat exchanger 11 is an example of the "underground heat exchange section" of the present invention. The water-air heat exchange unit 12 is an example of the "air heat exchange section" of the present invention. The heat pump device 13 is an example of the "heat pump section" of the present invention. The gas vaporizer 14 is an example of the "gas vaporizer" of the present invention. The first electric valve 31 is an example of the "first switching part" of the present invention. CPU601 which processes S16 is an example of the "first temperature acquisition means" of the present invention. CPU601 which processes S17 is an example of the "second temperature acquisition means" of the present invention. CPU601 which processes S18 is an example of the "first temperature judgment means" of the present invention. CPU601 which processes S19 is an example of the "first control means" of the present invention. CPU601 which processes S20 is an example of the "second control means" of the present invention.

The second electric valve 32 is an example of the "second switching part" of the present invention. CPU601 which processes S31 is an example of the "third temperature acquisition means" of the present invention. CPU601 which processes S32 is an example of the "fourth temperature acquisition means" of the present invention. CPU601 which processes S33 is an example of the "second temperature judgment means" of the present invention. CPU601 which processes S34 is an example of the "third control means" of the present invention. CPU601 which processes S35 is an example of the "fourth control means" of the present invention. The third electric valve 33 is an example of the "third switching section" of the present invention. CPU601 which processes S21 is an example of the "fifth control means" of the present invention. The fourth electric valve 34 is an example of the "fourth switching section" of the present invention. CPU601 which processes S36 is an example of the "fifth temperature acquisition means" of the present invention. CPU601 which processes S38 is an example of the "sixth control means" of the present invention. CPU601 which processes S41 is an example of the "seventh control means" of the present invention.

The present invention is not limited to the above embodiments, and various modifications are possible. For example, the first motor-operated valve 31, the second motor-operated valve 32, the third motor-operated valve 33, the fourth motor-operated valve 34, and the fifth motor-operated valve 35 are controlled by the CPU 601 to switch the flow paths. It is not limited to this. For example, the first motor-operated valve 31, the second motor-operated valve 32, the third motor-operated valve 33, the fourth motor-operated valve 34, and the fifth motor-operated valve 35 are not motor-operated valves, but are members that allow the user to manually switch the flow path. may be Also, the timing for switching the flow paths of the first motor-operated valve 31, the second motor-operated valve 32, the third motor-operated valve 33, the fourth motor-operated valve 34, and the fifth motor-operated valve 35 is determined by the user using the operation unit 609 to change the flow path. It may be the timing of inputting the switching instruction.

Also, the number of devices and the connection method of the channels are not limited to the above embodiment. For example, the underground heat exchanger 11 has two U tubes 111 and 112 buried underground, but the number of U tubes may be one or three or more. Also, a plurality of U-tubes may be connected in series or in parallel. Moreover, the underground heat exchanger 11 may not be a U tube. Similarly, the number of other devices (for example, the water-air heat exchange unit 12, the heat pump device 13, etc.), the connection method of flow paths, and the types of devices are not limited.

Further, although the flow paths are switched by the second motor-operated valve 32, the third motor-operated valve 33, and the fourth motor-operated valve 34, the flow paths may not be switched. In this case, the process of switching the flow paths by the second motor-operated valve 32, the third motor-operated valve 33, and the fourth motor-operated valve 34 may not be executed. Alternatively, the processes of S16, S17, S31, S32, and S36 may not be executed, and the first temperature, second temperature, third temperature, fourth temperature, and fifth temperature may not be acquired. The fourth flow path 24, the fifth flow path 25, the sixth flow path 26, the eighth flow path 28, the ninth flow path 29, and the tenth flow path 30 may not be provided.

Further, when an instruction to flow the first liquid 81 to the underground heat exchanger 11 was input (S52: YES), the first liquid 81 was flowed to the underground heat exchanger 11 (S54), but this is not limited to For example, the first liquid 81 may be caused to flow through the underground heat exchanger 11 at predetermined time intervals (eg, hourly intervals). Also, the first liquid 81 may be allowed to flow through the underground heat exchanger 11 at a predetermined time (for example, 3:00 pm).

In addition, when the first liquid 81 can warm the ground, the first liquid 81 is allowed to flow through the underground heat exchanger 11, and when the first liquid 81 cannot warm the ground, the underground heat exchanger 11 Although it has been described as an example that the first liquid 81 is not allowed to flow into the first liquid (see S33, S34, and S35), the present invention is not limited to this. For example, even if the first liquid 81 can heat the ground, the first liquid 81 does not have to flow through the underground heat exchanger 11 . Moreover, even when the first liquid 81 cannot warm the underground, the first liquid 81 may be allowed to flow through the underground heat exchanger 11 . In this case, the first liquid 81 can be heated in the underground heat exchanger 11 . Therefore, for example, in the first state (see FIG. 1), the first liquid 81 is heated in the underground heat exchanger 11, the first liquid 81 is heated in the water-air heat exchange unit 12, and the second One liquid 81 can be supplied to the heat pump device 13 . Moreover, the case where the first liquid 81 is supplied to the underground heat exchanger 11 and the case where it is not supplied may not be switched, and the first liquid 81 may be continuously supplied to the underground heat exchanger 11 .

1 gas vaporization system 11 underground heat exchanger 12 air heat exchange unit 13 heat pump device 14 gas vaporization equipment 21 first flow path 22 second flow path 23 third flow path 24 fourth flow path 25 fifth flow path 26 sixth flow Channel 27 Seventh channel 28 Eighth channel 29 Ninth channel 30 Tenth channel 31 First motor-operated valve 32 Second motor-operated valve 33 Third motor-operated valve 34 Fourth motor-operated valve 35 Fifth motor-operated valve 81 First liquid 82 second liquid 142 liquefied gas 511 first pump 512 second pump 601 CPU

Claims (9)

a subterranean heat exchange unit that exchanges heat between the first liquid and subterranean heat;
an air heat exchange unit that exchanges heat between the first liquid and air;
a heat pump unit that exchanges heat between the first liquid and the second liquid by a heat pump method;
a gas vaporization unit that vaporizes the liquefied gas by heat exchange between the second liquid heat-exchanged in the heat pump unit and the liquefied gas;
a first flow path through which the first liquid flows, the first flow path connecting the underground heat exchange section and the air heat exchange section;
a second flow path through which the first liquid flows, the second flow path connecting the air heat exchange section and the heat pump section;
a third flow path through which the first liquid flows, the third flow path connecting the underground heat exchange section and the heat pump section;
When the first liquid flows from the underground heat exchange section to the air heat exchange section through the first flow path, and from the underground heat exchange section to the heat pump section through the third flow path. 1. A gas vaporization system, comprising: a first switching unit for switching between flowing a liquid and flowing a liquid. a first temperature acquiring means for acquiring a first temperature that is the temperature of the first liquid flowing through the first channel or the third channel;
a second temperature acquiring means for acquiring a second temperature that is the temperature of the outside air;
a first temperature determination means for determining whether the first temperature acquired by the first temperature acquisition means is lower than the second temperature acquired by the second temperature acquisition means;
When the first temperature determination means determines that the first temperature is lower than the second temperature, the first switching unit is controlled to change the temperature from the underground heat exchange unit through the first flow path to the a first control means for flowing the first liquid to the air heat exchange section;
When the first temperature determination means determines that the first temperature is not lower than the second temperature, the first switching unit is controlled to control the underground heat exchange unit through the third flow path 2. The gas vaporization system according to claim 1, further comprising a second control means for causing the first liquid to flow from the heat pump portion to the heat pump portion. A channel through which the first liquid after being used for heat exchange in the heat pump section flows, comprising a fourth channel connecting the heat pump section and the underground heat exchange section. Item 3. The gas vaporization system according to Item 1 or 2. a fifth flow path through which the first liquid after being used for heat exchange in the heat pump section flows, the fifth flow path connecting the heat pump section and the air heat exchange section;
When the first liquid flows from the heat pump section to the underground heat exchange section via the fourth flow path, and when the first liquid flows from the heat pump section to the air heat exchange section via the fifth flow path 4. The gas vaporization system according to claim 3, further comprising a second switching unit for switching between the flow of the gas and the flow of the gas. a third temperature acquisition means for acquiring a third temperature, which is the temperature of the first liquid flowing through the fourth flow path;
a fourth temperature acquisition means for acquiring a fourth temperature, which is the temperature of the first liquid flowing through the first flow path, while the first liquid is flowing through the underground heat exchange unit;
a second temperature determination means for determining whether the third temperature acquired by the third temperature acquisition means is higher than the fourth temperature acquired by the fourth temperature acquisition means;
When the second temperature determination means determines that the third temperature is higher than the fourth temperature, the second switching unit is controlled to move from the heat pump unit to the underground via the fourth flow path. a third control means for causing the first liquid to flow through the heat exchange section;
when the second temperature determining means determines that the third temperature is not higher than the fourth temperature, controlling the second switching unit to output the air from the heat pump unit through the fifth flow path; 5. The gas vaporization system according to claim 4, further comprising fourth control means for causing the first liquid to flow through the heat exchange section. a sixth flow path through which the first liquid after heat exchange in the air heat exchange section flows, the sixth flow path connecting the air heat exchange section and the underground heat exchange section;
When the first liquid flows from the air heat exchange section to the heat pump section via the second flow path, and when the first liquid flows from the air heat exchange section to the underground heat exchange section via the sixth flow path. 6. The gas vaporization system according to any one of claims 3 to 5, further comprising a third switching unit for switching between a case of flowing one liquid and a case of flowing one liquid. When the vaporization of the liquefied gas by the gas vaporization unit is stopped, the third switching unit is controlled to transfer from the air heat exchange unit to the underground heat exchange unit through the sixth flow path 7. The gas vaporization system of claim 6, further comprising fifth control means for flowing the first liquid. a seventh flow path which is a flow path through which the second liquid flows and which is a flow path connecting the heat pump section and the gas vaporization section;
an eighth flow path through which the first liquid flows, the eighth flow path connecting the air heat exchange section and the gas vaporization section;
a case where the first liquid flows from the air heat exchange section to the heat pump section via the second flow path, and the second liquid flows from the heat pump section to the gas vaporization section via the seventh flow path; and a fourth switching section for switching between flowing the first liquid from the air heat exchange section to the gas vaporization section through the eighth passage. A gas vaporization system according to any one of the preceding claims. a fifth temperature acquiring means for acquiring a fifth temperature, which is the temperature of the first liquid flowing through the second channel or the eighth channel;
a third temperature determining means for determining whether the fifth temperature acquired by the fifth temperature acquiring means is lower than a vaporization temperature, which is a temperature at which the liquefied gas can be vaporized by the gas vaporizing section;
When the third temperature determination means determines that the fifth temperature is lower than the vaporization temperature, the fourth switching unit is controlled to change the heat pump from the air heat exchange unit through the second flow path. sixth control means for causing the first liquid to flow through the section and causing the second liquid to flow from the heat pump section to the gas vaporizing section through the seventh flow path;
When the third temperature determination means determines that the fifth temperature is not lower than the vaporization temperature, the fourth switching unit is controlled to change the air heat exchange unit from the air heat exchange unit through the eighth flow path. 9. The gas vaporization system according to claim 8, further comprising a seventh control means for causing the first liquid to flow through the gas vaporization section.

Images