JP5757752B2 - Underground heat storage type air conditioner - Google Patents

Description

  The present invention relates to an underground heat storage type heating and cooling apparatus that stores heat in the ground in an agricultural house and manages the underground temperature and the ground temperature to a temperature suitable for promoting the growth of crops.

  In order to promote the growth of crops (for example, chrysanthemums) in agricultural houses (hereinafter simply referred to as “houses”), it is necessary to maintain the vicinity of the root area of the crops at an appropriate temperature. However, underground heat exchange type temperature management for heating the soil where the crop is cultivated has been conventionally performed by passing a heat medium such as hot water therethrough.

  For example, Patent Document 1 warms the ground by making warm water with a boiler using oil or gas as a heat source, and passing the warm water through a pipe embedded in the soil in the house.

  Patent Document 2 stores heat by laying pipes in a muddy water-like heat storage area deeper than in the cultivated land and sending warm water warmed by the heat collector into the heat storage area. Also, instead of warm water, heat is stored by sending warm air into the heat storage area.

JP 2007-244278 A JP-A-5-260857

  However, for Patent Document 1, the fuel cost required to generate hot water is high, resulting in a large economic burden. In addition, Patent Document 2 has a structure in which heat is stored in a muddy water-like heat storage area for a long period of time, and temperature management that maintains the soil near the root area of the crop at an appropriate temperature cannot be performed.

  Accordingly, an object of the present invention is to provide an underground heat storage type heating / cooling device capable of heating the soil temperature in the vicinity of the root region in the house at low cost.

  An object of the present invention is to provide an underground heat storage type heating and cooling device that can efficiently store heat in the ground and can heat the soil temperature in the vicinity of the root region in the house with low running cost. .

The structure of the underground heat storage type heating and cooling device of the present invention for achieving the above object is the root zone warming pipe (3) extending horizontally in the ground and the ground deeper than the root zone warming pipe. A heat storage pipe (4) extending in the horizontal direction and a first pipe that extends from the first opening on the ground and branches at a branch position in the middle and communicates with the suction side ends of the root zone heating pipe and the heat storage pipe. A second pipe (8) that extends from the second opening on the ground and branches at a branch position in the middle and communicates with the discharge side of each of the root zone heating pipe and the heat storage pipe, A first fan (9) for sending air from the first opening of the first pipe to the root zone heating pipe and exhausting it from the second opening of the second pipe; and a first fan of the first pipe A second fan (10) that sends air from one opening to the heat storage pipe and exhausts it from the second opening of the second pipe; The first temperature sensor (21) to detect, the second temperature sensor (25) to detect the underground temperature near the root zone heating pipe, the detected temperature of the first temperature sensor and the second temperature sensor And a control unit (30) for performing rotation control of the first fan and the second fan based on the first fan and the first fan and the second fan when the first temperature sensor detects a predetermined temperature or higher. The second fan is rotated to send air to the root zone heating pipe and the heat storage pipe, and the controller is configured to send a second temperature sensor when the air is sent to the root zone heating pipe and the heat storage pipe. Is detected above a predetermined upper limit underground temperature, the rotation of the first fan is stopped, the rotation of the second fan is maintained, and air is sent only to the heat storage pipe .

The underground heat storage type heating / cooling device of the present invention preferably has a root region heating pipe (3) extending in the horizontal direction in the ground and a horizontal direction in the ground deeper than the root region heating pipe. A heat storage pipe (4) and a first pipe (7) extending from the first opening on the ground and branching at a midway branch position and communicating with the suction side end of each of the root region heating pipe and the heat storage pipe ), A second pipe (8) extending from the second opening on the ground and branching at a midway branch position and communicating with the discharge side of each of the root zone heating pipe and the heat storage pipe, and the first pipe A first switching valve (13) for opening and closing the first opening, a second switching valve (14) for opening and closing the second opening of the second pipe, and the first pipe A first fan (9) for sending air from the first opening of the second pipe to the root zone heating pipe and discharging from the second opening of the second pipe; and a first fan of the first pipe A second fan (10) that sends air to the heat storage pipe through the second opening of the second pipe and discharges it from the second opening of the second pipe, and a first temperature sensor (21) that detects the temperature on the ground, A second temperature sensor (25) for detecting the underground temperature near the root zone heating pipe, and the first fan and the second temperature sensor based on the detected temperatures of the first temperature sensor and the second temperature sensor. A control unit (30) for controlling the rotation of the fan, and the control unit (30), when the second temperature sensor detects less than a predetermined lower limit underground temperature, the first switching valve and the second switching valve Is closed, the first fan and the second fan are rotated so that their rotational directions are opposite to each other, and air is circulated between the root zone heating pipe and the heat storage pipe.

Another configuration of the underground heat storage type heating / cooling device of the present invention includes a root zone heating pipe (3) extending horizontally in the ground and a heat storage extending horizontally in the ground deeper than the root zone heating pipe. Pipe (4) and the first pipe (7) extending from the first opening on the ground and branching at a midway branch position and communicating with the suction side ends of the root zone heating pipe and the heat storage pipe A second pipe (8) extending from the second opening on the ground and branching at a branch position in the middle and communicating with the discharge side of each of the root zone heating pipe and the heat storage pipe, and the first pipe A fan (10) for sending air from the first opening to the root zone heating pipe and the heat storage pipe and discharging from the second opening of the second pipe, the root zone heating pipe and the first zone A first switching valve (15) for opening and closing the pipe, a first temperature sensor (21) for detecting the temperature of the ground, and the underground in the vicinity of the root zone heating pipe A second temperature sensor (25) for detecting the degree, and a control unit (30) for performing opening / closing switching control of the first switching valve based on the temperature detected by the first temperature sensor or the second temperature sensor. When the first temperature sensor detects a predetermined temperature or higher, the control unit opens the first switching valve, rotates the fan, and supplies the air to the first pipe, the heat storage pipe, and the root zone heating When the air is being sent to the first pipe and the heat storage pipe, the controller closes the first switching valve when the second temperature sensor detects a temperature exceeding the predetermined upper limit underground temperature. And air is sent only to the heat storage pipe .

  According to the present invention, it is configured to send warm air in the house to two layers, a layer near the root region in the ground and a layer deeper than that, to store heat in the heat storage layer, and near the root region in the ground and The temperature in the house can be kept fine and appropriate.

  In addition, heat is stored in the soil itself (soil around the pipe), and it is not necessary to install a special heat storage medium in the ground. In addition, heat is stored by air heated by sunlight. The energy cost required for temperature and heat storage can be reduced, and temperature management at a low running cost is possible. Further, by adopting a configuration in which air such as warm water is not circulated in the pipe but the air is circulated, the structure of the apparatus can be simplified and maintenance can be facilitated.

  Further, by heating the hot water and circulating it in the ground using a heat pump device, it is possible to store heat in the vicinity of the root area in the ground and in a deeper heat storage layer at high efficiency and at a low running cost. In addition, the heat stored in the heat storage layer is submerged in the ground when the efficiency of the heat pump device falls, such as in winter, or when the heat pump device cannot be heated (when the heat exchanger may be frosted). It can be used for heating the air in the root zone and the house, and the temperature of both the above-ground part and the underground part in the house can be appropriately managed at any time regardless of the season.

It is a figure which shows the 1st structural example of the underground temperature management apparatus in embodiment of this invention. It is a figure which shows the flow of the air of the operation mode 1 in a 1st structural example. It is a figure which shows the flow of the air of the operation mode 2 in a 1st structural example. It is a figure which shows the flow of the air of the operation mode 3 in a 1st structural example. It is a figure which shows the flow of the air of the operation mode 4 in a 1st structural example. It is a figure which shows the 2nd structural example of the underground temperature management apparatus in embodiment of this invention, and is a figure which shows the flow of the air of the operation mode 1 in a 2nd structural example. It is a figure which shows the flow of the air of the operation modes 2 and 3 in a 2nd structural example. It is a figure which shows the 3rd structural example of the underground temperature management apparatus in embodiment of this invention, and is a figure which shows the flow of the air of the operation mode 1 in a 3rd structural example. It is a figure which shows the flow of the air of the operation mode 2 in a 3rd structural example. It is a figure which shows the flow of the air of the operation mode 3 in a 3rd structural example. It is a figure which shows the 4th structural example of the underground temperature management apparatus in embodiment of this invention. It is a figure which shows operation | movement of the heat pump apparatus 50 in the 4th structural example of the heat pump apparatus 50 (operation mode 1-4). It is a figure which shows operation | movement of the heat pump apparatus 50 in the 4th structural example of the heat pump apparatus 50 (operation mode 5-6). It is a figure which shows the 5th structural example of the underground temperature management apparatus in embodiment of this invention. It is a figure which shows operation | movement of the heat pump apparatus 50 in the 5th structural example of the heat pump apparatus 50. FIG. It is a figure which shows the 6th structural example of the underground temperature management apparatus in embodiment of this invention. It is a figure which shows the 7th structural example of the underground temperature management apparatus in embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, such an embodiment does not limit the technical scope of the present invention.

<First configuration example>
FIG. 1 is a diagram illustrating a first configuration example of an underground temperature management apparatus according to an embodiment of the present invention. The house 1 is an agricultural house for plant / crop cultivation such as a single or double plastic house or glass house. The warming curtain film 2 divides the interior of the house 1 into upper and lower parts, and covers the curtain film 2 as necessary, thereby suppressing an increase in warm air and enhancing the warming effect near the ground.

  The root region heating pipe 3 is buried horizontally in the underground of the house 1 at a depth of about 50 cm to 80 cm, and further, the heat storage pipe 4 is installed at a depth of about 100 cm to 160 cm deeper than the root region heating pipe 3. Embed horizontally. The root zone heating pipe 3 is a pipe for heating the roots of the crop, and is laid near the root zone of the crop. The heat storage pipe 4 is a pipe for storing heat in the soil. In addition, the embedding depth of each pipe 3 and 4 is not restricted to the numerical value mentioned above by the difference in shallow root property or deep root property of a crop, but is adjusted suitably.

  Pipes 7 and 8 extending above the ground communicate with both ends of the root zone heating pipe 3 and the heat storage pipe 4. The pipes 7 and 8 extend in the underground direction from the openings 7a and 8a on the ground, branch at intermediate branch positions 7d and 8d, and communicate with the root region heating pipe 3 and the heat storage pipe 4, respectively. The pipe 7 is a suction pipe, and suction fans 9 and 10 are provided in the passage. The air (warm air) in the house 1 is sucked through the ground opening (suction port) 7a, and the root region is heated. Air is sent to the pipe 3 for heat storage and the pipe 4 for heat storage. The pipe 8 is a discharge pipe, and the air sucked from the suction port 7a of the pipe 7 passes through the root region heating pipe 3 and the heat storage pipe 4, respectively, and the ground opening (discharge port) of the pipe 8 is used. It is discharged from 8a. The installation position of the suction fans 9, 10 is not limited to the pipe 7, but may be the pipe 8, and may further be the underground root zone heating pipe 3 and the heat storage pipe 4. .

  Note that the suction port 7a and the discharge port 8a (communication with the heat storage pipe 4) are connected to the upper part of the house 1, preferably from the heat-insulating curtain film 2, in order to suck up the air that is heated and raised in the house 1. Provided on the upper side. Pipes 7 and 8 are provided with other openings 7b and 8b that open at positions lower than suction ports 7a and 8a. The other openings 7 b and 8 b are provided on the lower side of the heat-insulating curtain film 2. In the first configuration example, the other openings 7 b and 8 b are ends further branched from the branch portion communicating with the root region heating pipe 3 of the pipe 7.

  The underground side end portions (the portions protruding from the portion communicating with the underground pipe 3 or 4) 7c, 8c of the pipes 7, 8 are dew condensation, and moisture condensed in the pipes is collected. In order to be able to discharge into the ground, it is opened through a filter or the like that can transmit moisture.

  Further, valves 11, 12, 13 and 14 for opening and closing the respective openings 7a, 8a, 7b and 8b are provided, and further, the branch portions of the pipes 7 and 8 communicating with the root zone heating pipe 3 are opened and closed. Valves 15 and 16 are provided. The installation positions of the valves 11, 12, 13 and 14 are on the openings 7 a and 8 a side from the branch positions 7 d and 8 d of the root region heating pipe 3 and the heat storage pipe 4 in the pipes 7 and 8, respectively.

  Temperature sensors are provided at various locations. Specifically, the temperature sensors 21, 22, 23, 24, and 25 are respectively installed in the vicinity of the openings 7a, 8a, 7b, and 8b and in the vicinity of the root region heating pipe 3 embedded therein.

  The control unit 30 is a computer device and, as will be described below, based on the temperature information from the temperature sensors 21, 22, 23, 24, 25, the fans 9, 10 and the valves 11, 12, 13, 14, 15 and 16 are controlled. As an initial state, the fans 9, 10 are stopped, and the valves 11, 12, 13, 14, 15, 16 are also closed. The controller 30 may be installed inside or outside the house, and is electrically connected to the temperature sensor, the fan, and the valve by wire or wirelessly.

(Operation mode 1)
The operation mode 1 is a mode in which the air (warm air) in the house 1 flows through both the root region heating pipe 3 and the heat storage pipe 4, and FIG. 2 illustrates the air in the operation mode 1 in the first configuration example. Show the flow.

  During the day, the inside of the house 1 is warmed by sunlight, the temperature in the house 1 rises, and the warm air gathers in the upper part of the house 1. When the temperature detected by the temperature sensor 23 at the upper suction port 7a in the house 1 is equal to or higher than a predetermined temperature sufficient for heating (the temperature detected by the temperature sensor 25 is equal to or lower than a predetermined upper limit temperature), the control unit 30 Set the fan and valve to the next state.

Fan 9: Rotating Fan 10: Rotating Valve 11: Open Valve 12: Open Valve 13: Closed Valve 14: Closed Valve 15: Open Valve 16: Open By this, warm air is supplied from the inlet 7a to the root zone heating pipe 3 and heat storage Through the heat pipe 4, the heat in the vicinity of the root region is heated by heat exchange with the soil, and heat is accumulated in the soil in the vicinity of the heat storage pipe 4. The heat-exchanged air is discharged from the discharge port 8a.

  When the detected temperature of the temperature sensor 21 coincides with the detected temperature of the temperature sensor 22 or the difference is less than a predetermined temperature difference, it is determined that the heat exchange amount has decreased and the maximum heat storage amount has been reached. 10 operation is stopped.

(Operation mode 2)
The operation mode 2 is a mode in which the air (warm air) in the house 1 flows only through the heat storage pipe 4, and FIG. 3 shows the air flow in the operation mode 2 in the first configuration example.

  In operation mode 1, by introducing warm air into the ground, the underground temperature near the root zone increases. When the temperature detected by the temperature sensor 25 exceeds a predetermined upper limit temperature in the vicinity of the root zone, the control unit 30 closes the valves 15 and 16 and stops the rotation of the fan 9 with respect to the valve open / close state of the operation mode 1. . That is, the control unit 30 puts the fan and the valve into the next state.

Fan 9: Stop Fan 10: Rotating Valve 11: Open Valve 12: Open Valve 13: Closed Valve 14: Closed Valve 15: Closed Valve 16: Closed This stops the air inflow to the root zone heating pipe 3, Heating around the root zone is stopped. The predetermined upper limit temperature is appropriately set depending on the plant or crop being cultivated, but if the upper limit temperature is exceeded, the growth of the plant will be hindered. However, since warm air flows through the heat storage pipe 4, heat storage is continuously performed. The heat accumulated in the ground near the heat storage pipe 4 does not heat the soil (underground) near the root region.

  Furthermore, if the detected temperature of the temperature sensor 21 and the detected temperature of the temperature sensor 22 match or the difference is less than a predetermined temperature difference, it is determined that the heat exchange amount is reduced and the maximum heat storage amount has been reached. The operation of the fan 10 is also stopped.

(Operation mode 3)
The operation mode 3 is a mode in which underground heat stored in the vicinity of the heat storage pipe 4 is released into the house 1, and FIG. 4 shows the air flow in the operation mode 3 in the first configuration example.

  When the temperature in the house drops at night (when the temperature in the house drops below a predetermined temperature), the heat accumulated near the heat storage pipe 4 during the day is released into the house. Any of the temperature sensors 21, 22, 23, and 24 may be used as the temperature sensor that detects the temperature in the house. When at least one of the temperature sensors 21, 22, 23, 24 is detected below the predetermined temperature, the control unit 30 causes the heat accumulated in the vicinity of the heat storage pipe 4 to be released into the house. Set the fan and valve to the next state. Preferably, the warming curtain film 2 divides the house 1 up and down, so that the warm air can be prevented from rising to the upper part of the house 1 and the vicinity of the ground in the house 1 can be efficiently heated. As the air inlet / outlet, openings 7b, 8b at lower positions are used by the heat-insulating curtain film 2.

Fan 9: Stop Fan 10: Rotating Valve 11: Closed Valve 12: Closed Valve 13: Opened Valve 14: Opened Valve 15: Opened Valve 16: Opened By this, the cold air sucked from the suction port 7b passes through the heat storage pipe 4 Heat exchange is carried out by passing, and it is discharged | emitted from the discharge port 8b as warm air, and is discharge | released in the house 1. FIG.

  When the detected temperature of the temperature sensor 23 and the detected temperature of the temperature sensor 24 match or the difference is less than a predetermined temperature difference, it is determined that the accumulated heat amount has decreased, and the operation of the fan 10 is stopped. .

(Operation mode 4)
The operation mode 4 is a mode in which the soil in the vicinity of the root zone is heated by the underground heat stored in the vicinity of the heat storage pipe 4, and FIG. 5 illustrates the air flow in the operation mode 4 in the first configuration example. Show.

  When the temperature of the soil near the root zone decreases (when the temperature detected by the temperature sensor 25 falls below a predetermined temperature), the soil near the root zone is heated by the heat accumulated near the heat storage pipe 4. Therefore, the control part 30 makes a fan and a valve into the next state.

Fan 9: Reverse rotation Fan 10: Rotation Valve 11: Closed Valve 12: Closed Valve 13: Closed Valve 14: Closed Valve 16: Opened By this, the closed loop by the root region heating pipe 3 and the heat storage pipe 4 Is formed, and the air warmed through the heat storage pipe 4 is sent to the root zone warming pipe 3 by circulating the air in the closed loop, so that the soil in the vicinity of the root zone can be warmed. .

  When the temperature detected by the temperature sensor 25 exceeds a predetermined upper limit temperature in the vicinity of the root zone, the control unit 30 stops the rotation of the fans 9 and 10. Thereby, the heating in the vicinity of the root zone is stopped.

  As described above, in this embodiment, the pipes are laid near and deeper than the underground root area in the house, and the warm air in the house can be sent to both pipes. In operation mode 1, warm air is sent to both the vicinity of the root zone and deeper heat storage layers, and when a predetermined upper limit temperature is reached, switching to operation mode 2 is performed to send warm air only to the heat storage layer. It prevents excessive temperature rise in the vicinity of the root zone, maintains a suitable plant growth temperature, and can store heat sufficiently. When the temperature in the house falls below the predetermined lower limit temperature, the operation mode 3 releases the heat stored in the heat storage layer into the house, and when the temperature near the root zone decreases, the operation mode 4 The root area is heated by the heat stored in the heat storage layer. As described above, the temperature in the vicinity of the root area in the ground and in the house can be finely maintained at an appropriate temperature according to the temperature change in one day.

<Second configuration example>
FIG. 6 is a diagram illustrating a second configuration example of the underground temperature management device according to the embodiment of the present invention. In the second configuration example, the valves 11, 12, 13, 14, 15, and 16 are not provided, and the air flow is controlled by the fans 9 and 10, as compared with the first configuration example. Even if the passage is not blocked by the valve, the air flow can be substantially controlled by forcible intake / exhaust by the fan. Compared to the first configuration example, the apparatus is simplified, maintenance becomes easier, and the cost is reduced.

  The opening of the pipe 7 on the suction side is only the opening 7a. Furthermore, the opening of the pipe 8 on the discharge side is only 8a.

  In the second configuration example, the openings 7a and 8a are provided below the heat-insulating curtain film 2, but when the entire interior of the house 1 is sufficiently warmed by sunlight, warm air can be inhaled from the openings 7a. It is. Of course, the pipes 7 and 8 may be extended to the upper part of the house 1, and the openings 7a and 8a may be provided above the warming curtain film 2.

  In the second configuration example, the control unit 30 executes the control of the operation mode 1, the operation mode 2, and the operation mode 3 described above.

(Operation mode 1)
FIG. 6 shows the air flow in the operation mode 1 in the second configuration example. Specifically, when the temperature detected by the temperature sensor 21 at the upper inlet 7a in the house 1 is equal to or higher than a predetermined temperature sufficient for heating (the temperature detected by the temperature sensor 25 is equal to or lower than a predetermined upper limit temperature), the control unit 30 The fans 9 and 10 are set in the following state.

Fan 9: Rotation Fan 10: Rotation As described above, by rotating both of the fans 9 and 10, the air (warm air) in the house 1 is sucked from the suction port 7a, and the root zone heating pipe 3 and the heat storage are stored. It sends to both of the pipes 4, heat is exchanged in the ground, and is discharged from the discharge port 8a.

  When the detected temperature of the temperature sensor 21 coincides with the detected temperature of the temperature sensor 22 or the difference is less than a predetermined temperature difference, it is determined that the heat exchange amount has decreased and the maximum heat storage amount has been reached. 10 operation is stopped.

(Operation mode 2)
In the state of the operation mode 1, when the temperature detected by the temperature sensor 25 exceeds the predetermined upper limit temperature, the control unit 30 stops the rotation of the fan 9. That is, the control unit 30 puts the fan into the following state.

Fan 9: Stop Fan 10: Rotation This causes the air (warm air) in the house 1 to flow only through the heat storage pipe 4. FIG. 7 shows the air flow in the operation mode 2 in the second configuration example.

  When the detected temperature of the temperature sensor 21 and the detected temperature of the temperature sensor 22 match or the difference becomes less than a predetermined temperature difference, the control unit 30 stops the operation of the fan 10.

(Operation mode 3)
When the temperature in the house drops at night (when the temperature in the house drops below a predetermined temperature), the heat accumulated near the heat storage pipe 4 during the day is released into the house. Specifically, the control unit 30 causes the heat accumulated in the vicinity of the heat storage pipe 4 to be released into the house when at least one detected temperature of the temperature sensors 21 and 22 is lower than a predetermined temperature. Next, set the fan and valve to the following state.

Fan 9: Stop Fan 10: Rotation This is the same as the air flow in the operation mode 2 of FIG. 7, and only the temperature condition is different. In the operation mode 3, the cold air drawn from the suction port 7 a passes through the heat storage pipe 4, exchanges heat, is discharged as warm air from the discharge port 8 a, and is discharged into the house 1. Preferably, the warming curtain film 2 divides the house 1 up and down, so that the warm air can be prevented from rising to the upper part of the house 1 and the vicinity of the ground in the house 1 can be efficiently heated.

  When the detected temperature of the temperature sensor 21 and the detected temperature of the temperature sensor 22 match or the difference is less than a predetermined temperature difference, it is determined that the accumulated heat amount has decreased, and the operation of the fan 10 is stopped. .

<Third configuration example>
FIG. 8 is a diagram illustrating a third configuration example of the underground temperature management device according to the embodiment of the present invention. Compared with the first configuration example, the third configuration example uses the fans 9 and 10 in common, and the single fan 10 can send warm air to both the root region heating pipe 3 and the heat storage pipe 4. The fan 10 is provided at the position, that is, the pipe 7 above the branch point 7d of the pipe 7, and the valves 12 and 16 are omitted on the discharge side. The pipe 7 includes two openings 7a and 7b at different ground positions, and the pipe 8 also includes two openings 8a and 8b at different ground positions.

  In the third configuration example, the control unit 30 executes the control of the operation mode 1, the operation mode 2, and the operation mode 3 described above.

(Operation mode 1)
The controller 30 causes the air (warm air) in the house 1 to flow through both the root region heating pipe 3 and the heat storage pipe 4 by rotating the fan 10. FIG. 8 shows the air flow in the operation mode 1 in the third configuration example. Specifically, when the temperature detected by the temperature sensor 23 at the upper inlet 7a in the house 1 is equal to or higher than a predetermined temperature sufficient for heating (the temperature detected by the temperature sensor 25 is equal to or lower than a predetermined upper limit temperature), the control unit 30 The control unit 30 puts the fan and the valve into the next state. Higher openings 7a and 8a are used by the heat-insulating curtain film 2 as air inlets and outlets for more efficiently drawing warm air.

Fan 10: Rotation Valve 11: Open Valve 12: Open Valve 13: Closed Valve 15: Open By this, warm air passes from the inlet 7a to the root zone warming pipe 3 and the heat storage pipe 4 by heat exchange with the soil. The soil in the vicinity of the root zone is heated and heat is accumulated in the soil in the vicinity of the heat storage pipe 4. The heat-exchanged air is discharged from the discharge port 8a.

  Further, the control unit 30 stops the operation of the fan 10 when the detected temperature of the temperature sensor 21 and the detected temperature of the temperature sensor 22 match or the difference becomes less than a predetermined temperature difference.

(Operation mode 2)
In the state of the operation mode 1, when the temperature detected by the temperature sensor 25 exceeds a predetermined upper limit temperature, the control unit 30 closes the valve 15. That is, the control unit 30 puts the fan and valve into the next state.

Fan 10: Rotation Valve 11: Open Valve 12: Open Valve 13: Closed Valve 15: Closed Thereby, the air (warm air) in the house 1 flows only to the heat storage pipe 4. FIG. 9 shows the air flow in the operation mode 2 in the third configuration example.

  When the detected temperature of the temperature sensor 21 and the detected temperature of the temperature sensor 22 match or the difference becomes less than a predetermined temperature difference, the control unit 30 stops the operation of the fan 10.

(Operation mode 3)
FIG. 10 shows the air flow in the operation mode 3 in the third configuration example. When at least one of the temperature sensors 21, 22, 23, 24 is detected below the predetermined temperature, the control unit 30 causes the heat accumulated in the vicinity of the heat storage pipe 4 to be released into the house. Set the fan and valve to the next state. Preferably, the warming curtain film 2 divides the house 1 up and down, so that the warm air can be prevented from rising to the upper part of the house 1 and the vicinity of the ground in the house 1 can be efficiently heated. Openings 7b and 8b at lower positions are used by the heat-insulating curtain film 2 as air inlets and outlets for efficiently heating the vicinity of the ground.

Fan 10: Rotation Valve 11: Closed Valve 12: Closed Valve 13: Opened Valve 15: Closed By this, the cold air sucked from the suction port 7b is heat-exchanged by passing through the heat storage pipe 4, and is discharged as warm air. It is discharged from 8b and discharged into the house 1.

  When the detected temperature of the temperature sensor 21 and the detected temperature of the temperature sensor 22 match or the difference is less than a predetermined temperature difference, it is determined that the accumulated heat amount has decreased, and the operation of the fan 10 is stopped. .

  The temperature management control in each configuration example described above is preferably used for heating in the vicinity of the underground root area in the winter and for heating the ground part in the house, but for cooling the house and the soil in the summer. Is also available. That is, the temperature in the house can be lowered by exchanging heat from the warm air in the house in the ground and discharging the cold air. Also, when the temperature in the house is relatively low, such as at night, if the soil temperature in the vicinity of the root area remains higher than the optimum temperature, the air in the house is passed through the root area heating pipe 3 so that the vicinity of the root area Can reduce the soil temperature. A configuration for introducing cool air outside the house may be added.

  The heat storage pipe 4 is not limited to a single layer but may be laid across a plurality of layers having different depths (vertical parallel laying). Of course, it can also be laid in parallel in the same layer (horizontal parallel laying). The root zone heating pipe 3 can also be laid in parallel under the crop planting surface in the house (horizontal parallel laying).

  In addition, when a culvert pipe (not shown) is laid in the ground, the heat storage pipe 4 is preferably laid in a lower layer than the culvert pipe. This is because the lower side of the culvert pipe has more heat in the soil than the upper layer side, and therefore has a larger heat capacity and can store more heat than the upper layer side of the culvert pipe.

<Fourth configuration example>
FIG. 11 is a diagram illustrating a fourth configuration example of the underground temperature management device according to the embodiment of the present invention. The fourth configuration example is a configuration in which a liquid such as water is passed through the root zone heating pipe 3 and the heat storage pipe 4 in place of air, as compared with the first to third configuration examples described above. Each of the heating pipe 3 and the heat storage pipe 4 forms a closed loop. Furthermore, the circulating liquid is heated by a heat pump. The liquid is preferably water, and hot water heated by a heat pump circulates in each closed loop. Hereinafter, the hot water will be described as an example. However, it does not exclude the use of gas such as air as the fluid flowing through the root zone heating pipe 3 and the heat storage pipe 4, and the root zone heating pipe 3 and the heat storage pipe 4 include gas and liquid. Fluid can flow.

  The pipe 5 is connected to both ends of the root zone warming pipe 3 and extends to the ground, and forms a closed loop together with the root zone warming pipe 3. The ground hot water tank 17 is connected to the pipe 5 and forms a part of the closed loop of the root zone warming pipe 3. The pipe 6 is connected to both ends of the heat storage pipe 4 and extends to the ground, and forms a closed loop together with the heat storage pipe 4. The hot water tank 18 on the ground is connected to the pipe 6 and forms a part of the closed loop of the heat storage pipe 4. Moreover, the pump 19 and the pump 20 are provided in the pipe 5 and the pipe 6, respectively, and circulate the hot water in each closed loop.

  The pipe 5 and the pipe 6 are connected to each other on both sides of the hot water tanks 17 and 18 by connecting pipes 5a and 5b, respectively, and the connecting pipes 5a and 5b can be opened and closed by valves 41 and 42, respectively. Further, the pipe 5 is provided with a valve 43 between the connection position of the connection pipe 5 a and one end side of the hot water tank 17, and between the connection position of the connection pipe 5 b and the other end side of the hot water tank 17. In the pipe 6, a valve 44 is provided between the connection position of the connection pipe 5 a and one end side of the hot water tank 18, and a valve 46 is provided between the connection position of the connection pipe 5 b and the other end side of the hot water tank 18.

  The heat pump device 50 includes a heat exchanger 51A that exchanges heat with the air in the house 1, a heat exchanger 51B that exchanges heat with the hot water tank 17, and a heat exchanger 51C that exchanges heat with the hot water tank 18. Transfer of heat between the water in the tank 17 and the heat exchanger 51B is performed by a liquid (for example, water) flowing in the circulation path 61, and transfer of heat between the water in the hot water tank 18 and the heat exchanger 51C is performed in the circulation path 62. It is performed by a refrigerant (for example, water) flowing through Although the operation of the heat pump device 50 will be described later, the basic principle of the heat pump is well known, and thus detailed description thereof is omitted. Compared with an electric heater, the heat pump can use 3 to 6 times as much heat energy for heating with the same power consumption, and can be used as a heating and cooling device with high efficiency and low running cost.

  Temperature sensors are provided at various locations. Specifically, a temperature sensor 26 is installed at a position above the curtain film 2 in the house 1, a temperature sensor 27 is installed at a position below the curtain film 2, and the root zone heating pipe 3 is embedded. A temperature sensor 25 is installed in the vicinity of the ground. Furthermore, temperature sensors 28 and 29 for detecting the water temperatures in the hot water tank 17 and the hot water tank 8 are provided.

  The control unit 30 is a computer device and, as will be described below, based on temperature information from the temperature sensors 25, 26, 27, 28, 29, the pumps 19, 20 and the valves 41, 42, 43, 44, 45 and 46 and the operation of the heat pump device 50 are controlled. As an initial state, the pumps 19 and 20 are stopped, and the valves 41, 42, 43, 44, 45, and 46 are also closed. The controller 30 may be installed inside or outside the house, and is electrically connected to the temperature sensor, the fan, and the valve by wire or wirelessly. The control unit 30 may be a control device built in the heat pump device 50.

(Operation mode 1)
The operation mode 1 is a mode in which the hot water flowing through both the root zone heating pipe 3 and the heat storage pipe 4 is heated and circulated.

  12 and 13 are diagrams showing the operation of the heat pump device 50 in the fourth configuration example. The heat pump device 50 includes a heat exchanger 51A for exchanging heat with the air in the house 1 and the root region heating pipe 3. 51B for exchanging heat with the hot water flowing through the water, 51C for exchanging heat with the hot water flowing through the heat storage pipe 4, valves 54, 55, 56 and 57 for switching the connection positions of the expansion valve 52, the compressor 53 and the heat exchanger 51B. Prepare.

  In the operation mode 1, the heat exchanger 51A of the heat pump device 50 is operated as an evaporator, and the heat exchangers 51B and 51C are operated as condensers. And the hot water in the heat storage pipe 4 is heated. FIG. 12A shows the operation state of the heat pump device 50 in the operation mode 1, that is, the open / close state of the valve and the flow direction of the refrigerant in the heat pump cycle.

  In the operation mode 1, since the atmospheric heat in the house 1 is taken in by the heat exchanger 51A and the temperature in the house 1 is lowered, the operation mode 1 is in a time zone in which a certain temperature drop is allowed, for example, the house 1 It is assumed that the air inside is used during the daytime when it is warmed by sunlight. When the temperature detected by the temperature sensor 26 in the upper part of the house 1 is equal to or higher than a predetermined temperature sufficient for heating, the control unit 30 operates the heat pump device 50 in the state of FIG. Set the valve to the next state. Further, the operation mode 1 may be started by a manual operation start operation.

Pump 19: rotation (forward rotation)
Pump 20: rotation (forward rotation)
Valve 41: Closed Valve 42: Closed Valve 43: Open Valve 44: Open Valve 45: Open Valve 46: Open Heat captured by the heat exchanger 51A by the operation of the heat pump device 50 is released by the heat exchangers 51B and 51C. Then, the liquid flowing through the circulation paths 61 and 62 is heated, and heat exchange is performed with the water in the hot water tanks 17 and 18, and the hot water in the hot water tanks 17 and 18 is heated. A duct (not shown) for guiding the cool air discharged from the heat exchanger 51A to the upper part in the house 1 may be provided in the heat exchanger 51A.

  Thereby, the hot water flowing through the hot water tanks 17 and 18 flows through the pipe 5 and the pipe 6 respectively through the root zone heating pipe 3 and the heat storage pipe 4, and the soil near the root zone is exchanged by heat exchange with the soil. While being heated, heat is accumulated in the soil near the heat storage pipe 4. The hot water subjected to heat exchange in the ground returns to the hot water tanks 17 and 18 and is heated again and circulates.

  An upper limit is preferably provided for the temperature of the hot water tank 17. If the underground temperature in the vicinity of the root zone exceeds the appropriate temperature, the roots will be in a state that can grow, and plant growth may be inhibited. When the temperature of the hot water flowing through the root zone heating pipe 3 flowing in the vicinity of the root zone is relatively high, the temperature of the hot water flowing through the root zone heating pipe 3 rises excessively, and the portion close to the root zone warming pipe 3 However, the underground temperature of the root zone part slightly distant from the root zone warming pipe 3 becomes colder as it gets farther from the proper temperature, and the whole root zone cannot be heated sufficiently. Therefore, a relatively low temperature (for example, about 40 ° C.) warm water that does not exceed the appropriate temperature is allowed to flow through the root region heating pipe 3 so that the entire vicinity of the root region can be uniformly heated. For this purpose, the water temperature in the hot water tank 17 (the temperature detected by the temperature sensor 28) or the underground temperature in the vicinity of the root zone heating pipe 3 (the temperature detected by the temperature sensor 25) is set to a predetermined upper limit temperature (the upper limit temperature by the temperature sensor). Is different), the open / close state of the valves 54-57 of the heat pump device 50 is controlled so that the heat exchanger 51B is cut off from the heat pump cycle. Specifically, FIG. 12B shows an operation state of the heat pump device 50 in an operation mode 2 to be described later in which the heat exchanger 51B is cut off from the heat pump cycle. While operating in the operation mode 1, by intermittently switching to the operation mode 2, the water temperature of the hot water tank 17 is prevented from exceeding the set temperature, and rooting is prevented.

  With the start of the operation mode 1, the cool air is discharged from the heat exchanger 51A, and the temperature in the house 1 is lowered. When the air temperature in the house 1 (for example, the temperature detected by the temperature sensor 27) decreases to a preset lower limit ground temperature, the operation of the heat pump device 50 is stopped and the rotation of the pumps 19 and 20 is stopped.

(Operation mode 2)
The operation mode 2 is a mode in which the hot water flowing only in the heat storage pipe 4 is heated and circulated, and FIG. 12B shows the operation state of the heat pump device 50 in the operation mode 2 in the fourth configuration example.

  In operation mode 1, by circulating the hot water heated in the root zone heating pipe 3, the underground temperature in the vicinity of the root zone increases. As described in the item of the operation mode 1, when the underground temperature in the vicinity of the root region exceeds the appropriate temperature, the roots can be removed, and the growth of the plant may be inhibited. Therefore, in the operation mode 2, when the temperature detected by the temperature sensor 25 or the temperature sensor 28 exceeds a predetermined upper limit temperature (the upper limit temperature differs depending on the temperature sensor), in order to suppress the temperature rise in the root zone, Heat dissipation is stopped and heating of the water temperature in the hot water tank 17 is interrupted. The operation of the pump 19 is continued, and the hot water circulation in the root zone warming pipe 3 is continued, but since the relatively low temperature hot water that does not exceed the upper limit temperature circulates, the root zone rises to a temperature at which root burns occur. do not do.

  FIG. 12B shows the operation state of the heat pump device 50 in the operation mode 2, that is, the open / close state of the valves 54-57 and the direction in which the refrigerant flows in the heat pump cycle. In FIG. 12B, the heat exchanger 51A is operated as an evaporator, the heat exchanger 51C is operated as a condenser, the refrigerant circulation to the heat exchanger 51B is interrupted, and the heat taken in by the heat exchanger 51A Is released only from the heat exchanger 51C.

  When the temperature sensor 28 that measures the temperature sensor 25 that measures the underground temperature in the vicinity of the root zone or the temperature sensor 28 that measures the water temperature of the hot water tank 17 exceeds the predetermined upper limit underground temperature, the control unit 30 changes the heat pump device 50 to the state shown in FIG. Operate in the state of b). The pump and the valve are in the following state, and are the same as in operation mode 1. Alternatively, the operation mode 2 may be switched by a manual operation start operation.

Pump 19: Rotation Pump 20: Rotation Valve 41: Closed Valve 42: Closed Valve 43: Open Valve 44: Open Valve 45: Open Valve 46: Open The state of the pump and the valve is the same as in operation mode 1, and in the heat pump device 50 The operation modes 1 and 2 are switched only by the presence or absence of interruption from the heat pump cycle of the heat exchanger 51B. The predetermined upper limit temperature is appropriately set depending on the plant / crop being cultivated.

  When the water temperature in the hot water tank 17 or the underground temperature in the vicinity of the root zone heating pipe 3 is lower than the predetermined lower limit temperature by the operation in the operation mode 2, the operation mode 1 is resumed.

  Further, when the temperature in the house 1 is lowered by the operation in the operation mode 2 and is lowered to the preset lower limit ground temperature, the operation of the heat pump device 50 is stopped and the rotation of the pumps 19 and 20 is stopped. To do.

  In operation mode 2, since cold air is discharged from the heat exchanger 50A, the air in the house is increased when the air temperature in the house 1 rises excessively to such an extent that obstacles to the growth of plants and crops occur, such as in summer. It can also be used as a cooling operation for cooling.

(Operation mode 3)
The operation mode 3 is a mode in which the underground heat stored near the heat storage pipe 4 is released into the house 1. When the temperature in the house drops at night (when the temperature in the house drops below a predetermined temperature), the heat accumulated near the heat storage pipe 4 during the day is released into the house. The temperature sensor for detecting the temperature in the house may be either the temperature sensor 26 installed at the upper part of the house 1 or the temperature sensor 27 installed at the lower part of the house 1.

  FIG. 12C shows an operation state of the heat pump device 50 in the operation mode 3 in the fourth configuration example. The heat exchanger 51A is operated as a condenser and the heat exchanger 51C is operated as an evaporator according to the open / closed state of the valves 54-57 and the refrigerant circulation direction shown in FIG. The refrigerant circulation to the heat exchanger 51B is shut off. Thereby, the heat taken in by the heat exchanger 51C is released from the heat exchanger 51A. The heat exchanger 51C absorbs heat from the liquid flowing through the circulation path 62, and heat is released from the heat exchanger 51A by a heat pump cycle. Since the heat exchanger 51A exchanges heat with the air in the house 1, in the operation mode 3, hot air is discharged from the heat exchanger 51A. Since it is preferable that the warm air from the heat exchanger 51 </ b> A is discharged near the relatively low ground in the house 1, for example, unlike in the operation modes 1 and 2, the discharged warm air is transferred to the house 1. A duct (not shown) for guiding to the vicinity of the ground may be provided in the heat exchanger 51A. For example, the duct of the heat exchanger 51 </ b> A may have a configuration in which the duct has a branch, extends to an upper part and a lower part of the house 1, and an air flow path is appropriately switched by a valve according to an operation mode.

  The liquid in the circulation path 62 that has exchanged heat with the heat exchanger 51C absorbs heat from the hot water flowing through the hot water tank 18. At this time, the hot water that has been absorbed by the hot water tank 18 and lowered in temperature passes through the heat storage pipe 4 and is reheated by the heat accumulated in the soil in the vicinity of the heat storage pipe 4, and returns to the hot water tank 18. Heat exchange with 62 liquids can be continued.

  In a heat pump apparatus using air as a heat source, prevention of a frosting phenomenon that occurs on a low-temperature heat transfer surface is an issue. This is because heat is collected from low-temperature air during heating in winter, and the surface temperature of the evaporator-side heat exchanger in the atmosphere becomes 0 ° C or less, which causes frosting failure. Application of heat pumps to low-temperature and high-humidity areas in particular It has become a big issue.

  In this way, when the outside air temperature is low, such as at night in winter, heat exchange cannot be sufficiently performed due to frost formation on the heat exchanger (evaporator side), defrosting operation is necessary, and the efficiency of the heat pump ( COP) also decreases. The operation mode 3 is assumed to be operated in a time zone in which the outside air temperature at which frost formation may occur is low, but the heat exchanger 51C operating as an evaporator is a geothermal heat stored in the soil near the heat storage pipe. Since heat exchange is performed with the hot water heated at frosting, frosting does not occur and the efficiency of the heat pump can be prevented from decreasing.

  In the above-described operation modes 1 and 2, the heat exchanger 51A operating as an evaporator exchanges heat with the air in the house 1, but it is usually operated in a daytime when the temperature is relatively high. In addition, since the operation is stopped when the temperature in the house 1 falls below the lower limit temperature, there is no fear of frost formation on the heat exchanger 51A, and the efficiency of the heat pump is not reduced.

  When at least one detected temperature of the temperature sensor 26 or 27 in the house 1 falls below a predetermined lower ground temperature, the control unit 30 operates the heat pump device 50 in the state of FIG. To the state. Further, the operation mode 3 may be started by a manual operation start operation. Preferably, by dividing the house 1 up and down by the heat-insulating curtain film 2, it is possible to suppress warm air from rising to the upper part in the house 1 and to efficiently heat the vicinity of the ground in the house 1.

Fan 19: Stop Fan 20: Rotation Valve 41: Closed Valve 42: Closed Valve 43: Opened or closed Valve 44: Opened or closed Valve 45: Opened Valve 46: Opened Thereby, hot air is discharged from the heat exchanger 51A, Released into the house 1. When the temperature detected by the temperature sensor 27 in the house 1 reaches a predetermined upper limit ground temperature, the operation of the heat pump device 50 is stopped and the rotation of the pump 20 is stopped.

(Operation mode 4)
The operation mode 4 is a mode in which the soil in the vicinity of the root zone is heated with the underground heat stored in the vicinity of the heat storage pipe 4. In operation mode 1, warm water is circulated through the root zone warming pipe 3 for 24 hours to warm the root zone, but heat exchangers are used during the winter when the temperature drops below freezing point. When 51A is operated as an evaporator, cold air is discharged from the heat exchanger 51A, so that the temperature in the house 1 further decreases, and the heat exchanger 51A may not be able to sufficiently exchange heat due to frost formation. .

  Therefore, in this operation mode 4, when the root region cannot be heated by the operation mode 1, hot water is circulated between the heat storage pipe 4 and the root region heating pipe 3, and heat is stored in the vicinity of the heat storage pipe 4. Warm the root area using ground heat. Therefore, in the operation mode 4, the heat pump device 50 is not operated.

  When the temperature of the soil in the vicinity of the root area detected by the temperature sensor 25 is lower than the predetermined lower ground temperature, the soil in the vicinity of the root area is heated by the heat accumulated in the vicinity of the heat storage pipe 4. Therefore, the control part 30 makes a fan and a valve into the next state.

Pump 19: Reverse rotation Pump 20: Rotation Valve 41: Open Valve 42: Open Valve 43: Closed Valve 44: Closed Valve 45: Closed Valve 46: Closed Thereby, the valves 41, 42 are opened, and the connecting pipes 5a, 5b are opened. A closed loop is formed by the root zone heating pipe 3 and the heat storage pipe 4 through the air, and the air warmed by passing through the heat storage pipe 4 is circulated in the closed loop. The soil in the vicinity of the root zone can be warmed.

  When the temperature detected by the temperature sensor 25 exceeds a predetermined upper limit underground temperature near the root zone, the control unit 30 stops the rotation of the pumps 19 and 20. Thereby, the heating in the vicinity of the root zone is stopped. The pump 19 may be operated in the forward rotation direction, and the pump 20 may be operated in the reverse rotation direction.

(Operation mode 5)
As in the operation mode 4, the operation mode 5 is a mode in which the soil in the vicinity of the root zone is heated by the underground heat stored in the vicinity of the heat storage pipe 4. The difference from the operation mode 4 is that the heat pump device 50 is operated with the heat exchanger 50C of the heat pump device as an evaporator and the heat exchanger 50B as a condenser, and the vicinity of the root region is heated with the heat stored in the heat storage layer. . Since the heat exchanger 50C exchanges heat with the hot water circulating through the heat storage layer, there is no fear of frost formation even when operated as an evaporator, and heat can be transferred to the heat storage layer using a heat pump cycle.

  In the operation mode 5, the heat exchanger 51C of the heat pump device 50 is operated as an evaporator, and the heat exchanger 51B is operated as a condenser, so that the root region heating pipe 3 is removed from the liquid circulating in the heat storage pipe 4. Heat is transferred to the circulating liquid, the hot water stored in the heat storage layer is heated by the heat stored in the heat storage layer, and the heat stored in the heat storage layer is released to the soil near the root region. FIG. 13A shows the operation state of the heat pump device 50 in the operation mode 5, that is, the open / close state of the valves 54-57 and the flow direction of the refrigerant in the heat pump cycle.

  When the temperature of the soil in the vicinity of the root zone detected by the temperature sensor 25 is lower than the predetermined lower limit underground temperature, the control unit 30 sets the pump and the valve in the following state, and further, the heat pump device 50 is configured as shown in FIG. Operate in the state of.

Pump 19: Rotation Pump 20: Rotation Valve 41: Closed Valve 42: Closed Valve 43: Open Valve 44: Open Valve 45: Open Valve 46: Open The state of the pump and valve is the same as in operation modes 1 and 2. When the temperature detected by the temperature sensor 25 exceeds a predetermined upper limit underground temperature near the root zone, the control unit 30 stops the operation of the heat pump device 50 and stops the rotation of the pumps 19 and 20. Thereby, the heating in the vicinity of the root zone is stopped.

(Operation mode 6)
The operation mode 6 is a mode in which the underground heat stored in the vicinity of the heat storage pipe 4 is released to the soil in the vicinity of the root zone and is also released into the house 1 on the ground. It is a combination. In the operation mode 6, the heat exchanger 51C of the heat pump device 50 is operated as an evaporator, and the heat exchanger 51B and the heat exchanger 51A are operated as a condenser. The hot water in the warm pipe 3 is heated, and further, heat is released into the house 1. FIG. 13B shows the operation state of the heat pump device 50 in the operation mode 6, that is, the open / close state of the valves 54-57 and the direction in which the refrigerant flows in the heat pump cycle.

  In the operation mode 6, the temperature in the house 1 detected by the temperature sensor 26 or 27 is lower than the predetermined lower limit ground temperature, and the temperature of the soil near the root area detected by the temperature sensor 25 is the predetermined lower limit ground temperature. When lower, the control part 30 makes a pump and a valve the next state, and also operates the heat pump apparatus 50 in the state of FIG.13 (b).

Pump 19: Rotation Pump 20: Rotation Valve 41: Closed Valve 42: Closed Valve 43: Open Valve 44: Open Valve 45: Open Valve 46: Open The state of the pump and valve is the same as in operation modes 1 and 2. Whether the detected temperature of the temperature sensor 25 exceeds the predetermined upper limit underground temperature near the root region or the detected temperature of the temperature sensor 27 or 27 in the house 1 exceeds the predetermined upper limit ground temperature, the control unit 30 The operation mode 6 is switched to the operation mode 3 or 5 which does not exceed the predetermined upper limit temperature.

(Operation mode 7)
The operation mode 7 is a mode in which heat in the vicinity of the root zone is released to the heat storage layer, and is a mode used for cooling the ground in the vicinity of the root zone. As in the case of switching from the operation mode 1 to the operation mode 2 described above, it is necessary to prevent the underground temperature in the vicinity of the root zone from exceeding an appropriate temperature in order to prevent root burn. Even without heating by 1, the vicinity of the root zone may exceed a predetermined upper limit temperature. If the heat in the vicinity of the root zone is released to the atmosphere in the house 1, the air temperature in the atmosphere may increase excessively. Therefore, in operation mode 7, the heat in the vicinity of the root zone is not in the atmosphere in the house 1, but in the root zone. Heat is released to a deeper heat storage layer that does not have a thermal effect in the vicinity.

  That is, the operation mode 7 is a reverse operation of the operation mode 5 described above, and the heat pump device 50 is operated using the heat exchanger 50C of the heat pump device as a condenser and the heat exchanger 50B as an evaporator. As a result, heat is transferred from the liquid circulating in the root zone heating pipe 3 to the liquid circulating in the heat storage pipe 4, and the heat of the soil in the vicinity of the root zone is released to the heat storage layer to cool the vicinity of the root zone. Can do.

  FIG. 13C shows the operation state of the heat pump device 50 in the operation mode 7, that is, the open / close state of the valves 54-57 and the flow direction of the refrigerant in the heat pump cycle. In FIG. 13C, the heat exchanger 51B is operated as an evaporator, the heat exchanger 51C is operated as a condenser, the refrigerant circulation to the heat exchanger 51A is interrupted, and the heat taken in by the heat exchanger 51B. Is discharged from the heat exchanger 51C.

  When the temperature sensor 28 for measuring the underground temperature near the root zone or the temperature sensor 28 for measuring the water temperature of the hot water tank 17 exceeds the upper limit underground temperature that requires cooling, the control unit 30 displays the heat pump device 50. Operate in the state of 13 (c).

  When the temperature of the soil in the vicinity of the root zone detected by the temperature sensor 25 is lower than a predetermined lower limit underground temperature, the control unit 30 sets the pump and the valve to the next state, and further sets the heat pump device 50 in FIG. Operate in the state of.

Pump 19: Rotation Pump 20: Rotation Valve 41: Closed Valve 42: Closed Valve 43: Open Valve 44: Open Valve 45: Open Valve 46: Open The state of the pump and valve is the same as in operation modes 1 and 2. When the temperature detected by the temperature sensor 25 falls below a predetermined lower limit underground temperature that does not require cooling, the control unit 30 stops the operation of the heat pump device 50 and stops the rotation of the pumps 19 and 20. Thereby, the cooling in the vicinity of the root zone is stopped.

<Fifth configuration example>
FIG. 14 is a diagram illustrating a fifth configuration example of the underground temperature management device according to the embodiment of the present invention. In the fifth configuration example, compared to the fourth configuration example, the hot water tank 17 is shared with the pipe 5 and the pipe 6, and a bypass 5 c that does not flow through the hot water tank 17 is connected to the pipe 5. To do. The flow rate flowing through the hot water tank 17 and the flow rate flowing through the bypass passage 5c can be adjusted by the proportional valve 47, and the temperature of the hot water flowing through the root zone heating pipe 3 is controlled according to the mixing ratio. For example, based on the temperature detected by the temperature sensor 25, the proportional valve 47 is set so that the temperature of the hot water flowing through the root region heating pipe 3 is equal to or lower than the upper limit temperature (lower than the upper limit temperature of the hot water tank 17 in the fourth configuration example). Feedback control of the mixing ratio.

  In addition, by using one hot water tank, the heat pump device 50 does not need to prepare three heat exchangers as in the fourth configuration example, and uses the two heat exchangers 51A and 51B, so that The operation in each of the operation modes 1, 3-4 becomes possible. In the fifth configuration example, since there are two heat exchangers, there are no operation modes 2 and 5-7. The states of the pumps and valves in the operation modes 1 and 3-4 are the same as in the fourth configuration example.

  FIG. 15 is a diagram illustrating the operation of the heat pump device 50 in the fifth configuration example of the heat pump device 50. FIG. 15A corresponds to the operation mode 1, in which the heat exchanger 51A operates as an evaporator and the heat exchanger 51B operates as a condenser. FIG. 15B corresponds to the operation mode 3, in which the heat exchanger 51A operates as a condenser and the heat exchanger 51B operates as an evaporator.

  In the operation mode 1, if the water temperature in the hot water tank 17 rises excessively, the mixing control by the proportional valve 47 may not suppress the temperature of the hot water flowing through the root region heating pipe 3 below the upper limit temperature. is there. In that case, the heat pump device 50 is temporarily stopped to suppress an increase in the water temperature of the hot water tank 17. Thereby, although the temperature rise of a root zone can be prevented, the heat storage amount to a thermal storage layer is also suppressed. In this respect, in the fourth configuration example, separate warm water tanks 17 and 18 are provided for the root zone warming and the heat storage layer. Therefore, the hot water tank 18 for the heat storage layer in the fourth configuration example is Without being limited by the temperature of the root zone, heating can be performed in the operation mode 2, and more heat can be stored in the heat storage layer than in the fifth configuration example.

  As described above, in the present embodiment, the pipe is laid near and deeper than the underground root area in the house, and the heat in the house can be sent to both pipes by the heat pump device. When the operation mode 1 supplies heat to both the vicinity of the root zone and the heat storage layer deeper than that, and reaches a predetermined upper limit temperature, the operation mode 2 is switched to store heat only in the heat storage layer. It prevents excessive temperature rise in the vicinity of the root zone, maintains a suitable plant growth temperature, and can store heat sufficiently. And when the temperature in the house falls below a predetermined lower limit temperature, the operation mode 3 causes the heat pump device 50 to operate in reverse cycle with the cycle of the operation mode 1 or 2, and uses the heat stored in the heat storage layer, Heat the air in the house. Furthermore, when the temperature in the vicinity of the root zone decreases, the vicinity of the root zone is heated by the heat stored in the heat storage layer in the operation mode 4. As described above, the temperature in the vicinity of the root area in the ground and in the house can be finely maintained at an appropriate temperature in accordance with the season and the temperature change in the day.

<Sixth configuration example>
FIG. 16 is a diagram illustrating a sixth configuration example of the underground temperature management apparatus according to the embodiment of the present invention. The sixth configuration example is a configuration in which the root zone heating pipe 3 is disposed on the ground as compared with the fourth configuration example. The root zone warming pipe 3 is disposed in the culture medium of the elevated cultivation apparatus. The root region warming pipe 3 may be disposed, for example, in the vicinity of the root region in the medium of a plant cultivated by an elevated cultivation apparatus, or may be laid on the surface of the medium depending on the cultivation form. Thereby, it becomes applicable also to the temperature control of the root region of the plant cultivated by the above-mentioned high-cultivating apparatus, not the underground root region. The temperature sensor 25 measures the temperature in the vicinity of the root area of the culture medium on the ground.

  The cultivating device is based on the cultivation platform, and the cultivation bed is placed on the cultivation platform of the appropriate height from the ground, and plants such as strawberries, vegetables and flowers are cultivated using the culture medium on the cultivation bed. It is a device. For example, Japanese Patent Application Laid-Open No. 11-279924 discloses an upright cultivation apparatus. Daily maintenance and harvesting operations can be performed while standing, and the burden on the operator can be reduced. Various media such as culture soil, rock wool, coconut husk, rice husk, rice husk charcoal, and wood chips can be used as the medium. In addition, facilities necessary for cultivation such as watering pipes and drains are provided.

  The underground temperature management device of the sixth configuration example can perform the same operation as the operation mode in the fourth configuration example, that is, can be operated in the above-described operation modes 1-7. In the operation mode 7 described above, the root zone heating pipe 3 operates to cool the vicinity of the root zone, and thus functions as a root zone temperature adjusting pipe regardless of its name. In upland cultivation, the culture medium is more susceptible to solar heat and outside air temperature than in the case of local planting cultivation. In particular, in the high temperature period (summer season), the temperature of the medium rises above the outside temperature, The root growth environment may be deteriorated, and the operation mode 7 for cooling the root area (and not storing the heat in the house but accumulating it in the ground) is effective.

<Seventh configuration example>
FIG. 17 is a diagram showing a seventh configuration example of the underground temperature management apparatus in the embodiment of the present invention. As in the sixth configuration example, the seventh configuration example is a configuration in which the root zone warming pipe 3 is disposed on the ground. In the fifth configuration example described above, the root zone warming pipe 3 is provided. Is arranged on the ground. Similar to the sixth configuration example, the temperature sensor 25 measures the temperature in the vicinity of the root region in the ground medium. The seventh configuration example is also applied when, for example, a root zone heating pipe is disposed in the medium of the tall cultivation apparatus, and is operable in the above-described fifth configuration example, that is, the operation Operation in modes 1, 3-4 is possible.

  Further, in each of the above-described configuration examples, the heat storage pipe 4 is not limited to one layer, and a plurality of heat storage pipes 4 may be laid over a plurality of layers having different depths, or a plurality of pipes may be laid on the same layer. A plurality of root zone heating pipes 3 can also be laid in parallel in accordance with the number of cultivation rows of plants in the house.

  1: agricultural house, 2: heat insulation curtain film, 3: root zone heating pipe, 4: heat storage pipe, 5: closed loop forming pipe, 6: closed loop forming pipe, 7: suction pipe, 7a: opening Part, 7b: opening, 7c: condensation condensation, 7d: branch position 8: discharge pipe, 8a: opening, 8b: opening, 8c: condensation condensation, 8d: branching position, 9: fan, 10: fan, 11: Valve, 12: Valve, 13: Valve, 14: Valve, 15: Valve, 16: Valve, 17: Hot water tank, 18: Hot water tank, 19: Pump, 20: Pump, 21: Temperature sensor, 22: Temperature Sensor: 23: Temperature sensor 24: Temperature sensor 25: Temperature sensor 26: Temperature sensor 27: Temperature sensor 28: Temperature sensor 29: Temperature sensor 30: Control unit 41: Valve 42: Valve 43: Valve, 44: Valve, 45: 46: valve, 47: valve, 50: heat pump device, 51A: heat exchanger, 51B: heat exchanger, 51C: heat exchanger, 52: expansion valve, 53: compressor, 54: valve, 55: valve, 56: Valve, 57: Valve, circuit 61, circuit 62

Claims (7)

A root heating pipe extending horizontally in the ground,
A heat storage pipe extending horizontally in the ground deeper than the root zone heating pipe;
A first pipe that extends from the first opening on the ground and branches at an intermediate branch position and communicates with the suction side end of each of the root region heating pipe and the heat storage pipe;
A second pipe that extends from the second opening on the ground and branches at a branch position in the middle and communicates with the discharge side of each of the root region heating pipe and the heat storage pipe;
A first fan that sends air from the first opening of the first pipe to the root zone heating pipe and exhausts the air from the second opening of the second pipe;
A second fan for sending air from the first opening of the first pipe to the heat storage pipe and exhausting the air from the second opening of the second pipe;
A first temperature sensor that detects the temperature of the ground;
A second temperature sensor for detecting an underground temperature in the vicinity of the root zone heating pipe;
A control unit that performs rotation control of the first fan and the second fan based on detection temperatures of the first temperature sensor and the second temperature sensor ;
When the first temperature sensor detects a predetermined temperature or higher, the control unit rotates the first fan and the second fan, and sends air into the root region heating pipe and the heat storage pipe. ,
When the second temperature sensor detects a temperature equal to or higher than a predetermined upper limit underground temperature when air is being sent to the root zone heating pipe and the heat storage pipe, the control unit An underground heat storage type heating / cooling device that stops rotation, maintains rotation of the second fan, and sends air only to the heat storage pipe . In claim 1,
When the first temperature sensor detects a temperature lower than a predetermined lower limit ground temperature, the control unit rotates the second fan and feeds air into the heat storage pipe. apparatus. A root heating pipe extending horizontally in the ground,
A heat storage pipe extending horizontally in the ground deeper than the root zone heating pipe;
A first pipe that extends from the first opening on the ground and branches at an intermediate branch position and communicates with the suction side end of each of the root region heating pipe and the heat storage pipe;
A second pipe that extends from the second opening on the ground and branches at a branch position in the middle and communicates with the discharge side of each of the root region heating pipe and the heat storage pipe;
A first switching valve for opening and closing the first opening of the first pipe;
A second switching valve for opening and closing the second opening of the second pipe ;
A first fan that sends air from the first opening of the first pipe to the root zone heating pipe and exhausts the air from the second opening of the second pipe;
A second fan for sending air from the first opening of the first pipe to the heat storage pipe and exhausting the air from the second opening of the second pipe;
A first temperature sensor that detects the temperature of the ground;
A second temperature sensor for detecting an underground temperature in the vicinity of the root zone heating pipe;
A control unit that performs rotation control of the first fan and the second fan based on detection temperatures of the first temperature sensor and the second temperature sensor ;
When the second temperature sensor detects a temperature lower than a predetermined lower limit underground temperature, the control unit closes the first switching valve and the second switching valve, and the first fan and the second The underground heat storage type heating and cooling device is characterized in that the fans are rotated so that their rotational directions are opposite to each other, and air is circulated between the root region heating pipe and the heat storage pipe. In claim 3 ,
The first pipe further includes a third opening at a position lower than the first opening,
The second pipe further includes a fourth opening at a position lower than the second opening,
A third switching valve for opening and closing the third opening; a fourth switching valve for opening and closing the fourth opening; and detecting a ground temperature at a position lower than the first temperature sensor. A third temperature sensor is provided,
The first fan sends air from the third opening to the root region heating pipe, and exhausts it from the fourth opening.
The second fan sends air from the third opening to the heat storage pipe and exhausts it from the fourth opening.
The underground heat storage type heating / cooling device, wherein the control unit performs open / close switching control of the third switching valve and the fourth switching valve based on a temperature detected by the third temperature sensor. In claim 4 ,
When the third temperature sensor detects a temperature lower than a predetermined temperature, the control unit closes the first switching valve and the second switching valve, and the third switching valve and the fourth switching valve An underground heat storage type heating / cooling apparatus, wherein the second fan is rotated and air is sent to the heat storage pipe. A root heating pipe extending horizontally in the ground,
A heat storage pipe extending horizontally in the ground deeper than the root zone heating pipe;
A first pipe that extends from the first opening on the ground and branches at an intermediate branch position and communicates with the suction side end of each of the root region heating pipe and the heat storage pipe;
A second pipe that extends from the second opening on the ground and branches at a branch position in the middle and communicates with the discharge side of each of the root region heating pipe and the heat storage pipe;
A fan that sends air from the first opening of the first pipe to the root region heating pipe and the heat storage pipe, and discharges the air from the second opening of the second pipe;
A first switching valve for opening and closing the root zone heating pipe and the first pipe;
A first temperature sensor that detects the temperature of the ground;
A second temperature sensor for detecting an underground temperature in the vicinity of the root zone heating pipe;
A control unit that performs open / close switching control of the first switching valve based on the detected temperature of the first temperature sensor or the second temperature sensor;
When the first temperature sensor detects a predetermined temperature or higher, the control unit opens the first switching valve, rotates the fan, and supplies air to the first pipe, the heat storage pipe, and the root. When the air is sent to the first pipe and the heat storage pipe, when the second temperature sensor detects a predetermined upper limit underground temperature or more, An underground heat storage type heating and cooling device, wherein the first switching valve is closed and air is fed only into the heat storage pipe. In claim 6 ,
When the first temperature sensor detects a temperature lower than a predetermined lower limit ground temperature, the control unit closes the first switching valve, rotates the fan, and sends air into the heat storage pipe. Underground heat storage type heating and cooling device.

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