JP2003164222A - Method for controlling ground temperature and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling ground temperature with which running cost is controlled to a low level and heat quantity required for one day can be ensured to make a response even to the peak of a thermal load without especially increasing the size of equipment when the soil temperature is controlled by arranging heating medium pipes in the ground of planting land such as pitch. <P>SOLUTION: This system for controlling the ground temperature is obtained by burying the heating medium pipes 2 in the planting land for plants such as lawn, connecting the heating medium pipes 2 to a heating medium tank 5 and circulating the heating medium of cold water or warm water through the interior of the heating medium pipes 2. In the system, the heating medium tank 5 is connected to a first and a second thermal storage tanks 3 and 4 and the cold water or warm water intending to return to the heating medium tank 5 is made to flow into the first thermal storage tank 3 when the cold water of the heating medium tank 5 reaches the set value or above or the warm water reaches the set value or below. The cold water or warm water in the second thermal storage tank 4 is set at a lower or a higher temperature than that of the heating medium tank 5 and fed to the heating medium tank 5. The circulating cold water or warm water is returned to the heating medium tank 5 again after the temperature of the heating medium tank 5 is recovered to the set value. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil temperature control method and control device for a sports field such as a soccer field, a golf course, etc., a farmland, a garden, etc., where grass and other plants are planted.

[0002]

2. Description of the Related Art As a sports competition facility where turf is planted, for example, in a stadium such as a natural turf field (hereinafter referred to as the pitch) for playing soccer, golf courses, tennis courts, etc., in good condition throughout the year. In order to be able to compete, it is effective to maintain the soil temperature suitable for the growth of natural grass and keep the natural grass in a growing state at all times.

For controlling the soil temperature for maintaining such an appropriate soil temperature, for example, a cold / hot water pipe is buried in the soil under the lawn planting surface, and a heating medium (hot water in winter, cold water in summer) is used as cold / hot water. It is circulated in a pipe, and the heat medium heats or cools the soil to prevent winter death and summer burn of grass.

By the way, the ground temperature control by the cold / hot water pipe is conventionally performed by connecting a cold / hot water tank to the cold / hot water pipe, as described in, for example, Japanese Patent No. 2971062 and JP-A-7-143818. After sending the heat medium to the hot and cold water pipes for heat exchange in the ground, this heat medium is collected in the cold and hot water tank and sent out again to the cold and hot water pipes, and such circulation is repeated to maintain the soil temperature at a predetermined value. There is.

To maintain the temperature of the cold / hot water in the cold / hot water tank at a set value, a heat source such as a cold / hot water machine is connected to the cold / hot water tank to heat or cool the cold / hot water in the cold / hot water tank. Further, a heat storage tank and a cold / hot water tank are provided, the heat medium after heat exchange in the ground is recovered in the heat storage tank, and sent out from the cold / hot water tank communicating with the heat storage tank to the cold / hot water pipe, and the soil temperature is repeated by repeating such circulation. There is also a method of maintaining a predetermined value. In this method, a heat source such as a cold / hot water machine is connected to the heat storage tank to heat or cool the cold / hot water in the heat storage tank, and the heat medium in the cold / hot water tank is controlled to always have a desired temperature.

[0006]

The temperature of the day is constantly changing, and the facility capacity for maintaining the temperature of the cold and hot water at the set value must take into consideration the difference between the daytime and nighttime temperatures. . In other words, taking winter as an example, compared to the heat required during the daytime, the nighttime temperature requires an extra amount of heat due to the temperature drop, of course,
The opposite is true in summer.

However, conventionally, since the equipment for heating or cooling the hot / cold water is only the cold / hot water machine which is the heat source connected to the cold / hot water tank, in order to obtain the temperature of the cold / hot water of a predetermined value, this heat Equipment must be configured for peak load times (midnight to dawn in winter and afternoon in the daytime in summer), resulting in larger equipment and higher running costs to operate it. , Economically unfavorable. Further, a heat storage tank and a cold / hot water tank are provided, the heat medium after heat exchange in the ground is recovered in the heat storage tank, and sent out from the cold / hot water tank communicating with the heat storage tank to the cold / hot water pipe, and the soil temperature is repeated by repeating such circulation. Although a method of maintaining the value at a predetermined value can prevent an increase in the size of equipment and an increase in running cost, the system tends to be complicated.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, to keep the running cost low without increasing the size of the equipment, to secure the amount of heat required for one day, and to cope with the peak heat load. It is to provide a soil temperature control method and an apparatus thereof.

[0009]

In order to achieve the above object, the present invention is, as a control method, firstly, by embedding a heat medium pipe in a planting place and connecting a heat medium tank to the heat medium pipe. In the soil temperature control system for circulating the heat medium in the heat medium pipe, the heat medium tank is connected to the heat medium tank, and the heat medium to be returned to the heat medium tank is stored in the heat medium tank according to the set value of the temperature of the heat medium tank. Heat that flows in and supplies the heat medium in the heat storage tank with a temperature difference set to a temperature lower or higher than the heat medium tank to the heat medium tank, and circulates after the temperature of the heat medium tank recovers to the set value. The gist is to return the medium to the heat medium tank again.

Secondly, the supply of the heat medium from the heat storage tank to the heat medium tank is based on the fact that the same amount of heat medium as the heat medium flowing into the heat storage tank automatically flows out.

Thirdly, as a device, a ground temperature used in a ground temperature control system in which a heat medium pipe is embedded in a planting ground, a heat medium tank is connected to the heat medium pipe to circulate the heat medium in the heat medium pipe. In the control device, the heat storage tank is connected to the heat medium tank via the communication section, and the valve section is provided in the communication section so that the heat medium flows only from the heat storage tank side to the heat medium tank side. Is the gist.

Fourthly, the heat storage tank comprises a first heat storage tank and a second heat storage tank communicating with the first heat storage tank, and a heat source is connected to the second heat storage tank to heat the second heat storage tank. The gist is to connect the heat medium pipe to the first heat storage tank so as to communicate with the medium tank.

According to the first aspect of the present invention, when the temperature of the refrigerant medium in the heat medium tank becomes equal to or higher than the set value and the temperature of the heat medium becomes equal to or lower than the set value at the peak of the heat load, the heat medium tank is returned to the heat medium tank. The heat medium that flows into the heat storage tank is supplied to the heat medium tank by supplying the refrigerant medium or the heat medium in the heat storage tank, which is set to a temperature lower or higher than the heat medium tank, to supplement the insufficient heat amount, The bath temperature can be easily returned to the set value.

In this case, the total required heat amount for one day (calculated for each hour and the total thereof) is calculated, and the average required heat amount per unit time is calculated therefrom. Insufficient heat is calculated every hour in the time period when the heat load is larger than the average required heat, and the total of the insufficient heat is obtained. By preparing a heat storage tank that can store the amount of heat, the equipment scale can be minimized. The operating cost can be reduced accordingly. (Considering as a one-day cycle, residual heat is stored when the heat load is small, and heat is released from the heat storage tank when the heat load is large.) This simulation examines the summer and winter seasons, and the one with a large amount of insufficient heat Determine the size.

According to the second aspect of the present invention, in addition to the above action, the supply of the refrigerant medium or the heating medium from the heat storage tank to the heating medium tank is the same as that of the heating medium flowing into the heating tank. Since it automatically flows out, it suffices to change the circulation path of the heat medium returning from the heat medium pipe from the heat medium tank to the heat storage tank. Therefore, no special equipment is required and it can be surely and easily performed.

According to the third aspect of the present invention, the heat storage tank is connected to the heat medium tank via the communication section, and the heat medium flows into the communication section only from the heat storage tank side to the heat medium tank side. Since the heat medium does not flow backward from the heat medium tank to the heat medium tank side by providing the valve body, the heat medium can be reliably supplied only from the heat medium tank side to the heat medium tank side.

According to the fourth aspect of the present invention, in addition to the above function, the heat medium returned from the heat medium tube and having undergone heat exchange flows into the first heat storage tank which is not in direct communication with the heat medium tank. In addition, since the heat source is connected to the second heat storage tank that communicates with the heat medium tank, the insufficient heat amount can be reliably supplied to the heat medium tank.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a system flow diagram showing an embodiment of the ground temperature control method and apparatus of the present invention, and FIG. 2 is a piping diagram of the heat medium pipe of the same. When the present invention is carried out on a natural grass ground (pitch) for soccer competitions. Will be described as an example.

Describing the overall structure of the ground temperature control system, reference numeral 1 in the figure indicates a pitch (natural grass ground). In this embodiment, for example, five blocks are provided depending on various conditions such as sunshine, ventilation, a positional relationship with a building, and watering. 1a, 1b, 1
It is divided into c, 1d, and 1e, and the ground temperature is controlled for each of the blocks 1a to 1e.
The heat medium pipe 2 is piped underground every 1e.

The inlet side 7 and the outlet side 8 of the plurality of heat medium pipes 2 arranged in each of the blocks 1a to 1e are connected to the header pipes 6a and 6b via manual valves 9, respectively, and the inlet side 7 is connected. The header pipe 6a is connected to a heat medium pipe 10a through which a heat medium circulates via an electric valve 12, and the heat medium pipe 10a is connected to a heat medium tank 5 via a heat medium circulation pump 11. Further, the header pipe 6b on the outlet side 8 is also connected to the heat medium pipe 10b through which the heat medium circulates via the flow meter 17, but the heat medium pipe 10b is branched midway, and one of the branch pipes is a manual valve. 9
Is connected to the heat medium tank 5 via the, and the other branch pipe is connected to the first heat storage tank 3 via the electric valve 12.

The first heat storage tank 3 communicates with the second heat storage tank 4, and the second heat storage tank 4 communicates with the heat medium tank 5 through the communication pipe 13. The first heat storage tank 3, the second heat storage tank 4, and the heat medium tank 5 are configured as an integrated tank, and the first heat storage tank 3 and the second heat storage tank 3 are combined.
The heat storage tank 4 is partitioned by a partition plate 24 having an opening 25 for communication in the middle thereof, and the partition plate 26 having an opening 27 for communication in the middle of the second heat storage tank 4 and the heat medium tank 5. Partitioned with.

Then, the communication pipe 13 is arranged in the opening 27 provided in the partition plate 26 for partitioning the second heat storage tank 4 and the heat medium tank 5. As shown in FIG. 4, the communication pipe 13 is not required to be as watertight as a check valve, but is, for example, a plate-shaped valve body whose upper portion is rotatably attached to the upper end of the opening 27. Although the inflow of the heat medium (cool / hot water) from the heat storage tank 4 side to the heat medium tank 5 side is permitted, the inflow of the heat medium (cool / hot water) from the heat medium tank 5 side to the second heat storage tank 4 side is Configure to block.

Further, the tip of the supply pipe 15 for supplying the heat medium to the second heat storage tank 4 opens into the second heat storage tank 4 via the heat source pump 14. Although not shown, the other end of the supply pipe 15 is connected to a cold / hot water generator, which serves as a heat source, for air conditioning of a building, for example, via a heat exchanger. In the figure, 16 indicates a thermometer.

The first heat storage tank 3 and the second heat storage tank 4 are for supplementing the heat quantity which is insufficient with the heat medium supplied from the heat medium tank 5, and the first heat storage tank 3 and the second heat storage tank 4 are stored. The capacity of the tank 4 is determined by the insufficient amount of heat. The calculation of this heat deficit is calculated by calculating the total heat requirement for one day (calculated for each hour and totaling it), calculating the average heat requirement per unit time, and then the heat load becomes greater than the average heat requirement. It is calculated by calculating the amount of heat deficit for each hour. When considered as a one-day cycle, the residual heat is stored when the heat load is small, and the heat is released from the heat storage tank when the heat load is large. In this simulation, the summer and winter are examined, and the capacity is determined based on the one with the larger amount of heat loss.

The heat medium tube 2 is made of a material resistant to high temperature, and the total pitch of the entire pitch 1 reaches 40 km. Therefore, the arrangement is determined in consideration of the following points. There is no pipe connecting portion of the heat medium pipe 2 in the pitch 1. The bent portion of the heat medium tube 2 is reduced as much as possible in order to reduce the pressure loss. The influence of the temperature difference between the entrance and exit of the heat medium tube 2 is minimized. Even if one of the heat medium tubes 2 goes down (stops operation due to a failure such as a leak), the influence on the turf should be minimized.

As for the above, it is carried out in order to improve the reliability against leakage and the like. As shown in FIG. 2, a 165 m-1 piece (without connecting joint) of a cross-linked polyethylene pipe is specially manufactured, and the heat of this one piece is used. One end of the medium pipe 2 is the inlet side 7,
The other end was used as the outlet side 8 and each was connected to the header pipes 6 a and 6 b via the manual valve 9.

As for the above, it is carried out in order to reduce the pump head (pressure) and to suppress the operating energy. As shown in FIG. 2 as well, the heat medium tube 2 of 165 m-1 has only one bend at 180 °. Then, the whole was flatly curved into a U-shape, and all portions other than the bent portion were straight pipes.

With respect to the above, since there is expected to be a temperature difference of 3 ° C. or more at the inlet and outlet of the heat medium tube 2 at the peak of heat load, there is concern about the influence on the grass. Therefore, as shown in FIG. 2, the adjacent heat medium tubes 2 are arranged so that the inlet side 7 and the outlet side 8 are alternately arranged. In this case, the space between the heat medium tubes 2 is, eg, 300 mm.

Adjacent heat medium tubes 2 have inlet side 7 and outlet side 8
In the arrangement in which the heat medium pipes 2 are alternately arranged, the one heat medium pipe 2 is curved in a U-shape as described above, and only one bend is made at 180 °. Is
As a result, the inlet side 7 and the outlet side 8 are parallel to each other, but not only this but also the heat medium tubes 2 in the same block 1a to 1e are parallel to each other as shown in FIG. Between the inlet side 7 and the outlet side 8, the inlet side 7 of the heat medium pipe 2 adjacent to one side and the outlet side 8 of the heat medium pipe 2 adjacent to the other side.
And the adjacent heat medium tubes 2 are alternately arranged on the inlet side 7 and the outlet side 8.

Furthermore, not only for the heat medium tubes 2 in the same block 1a to 1e but also for the adjacent block 1
As for the heat medium tubes 2 of a to 1e, the inlet side 7 and the outlet side 8 of the adjacent heat medium tubes 2 are arranged alternately as shown in FIG.

As will be described later with reference to an electric control system diagram (FIG. 3), the heat medium pipe 2 includes blocks 1a to 1e.
A motor-operated valve 12 and a flow meter 17 are provided for each of them, and by controlling the motor-operated valve 12 to be opened and closed, the heat medium can be sent or stopped for each of the blocks 1a to 1e.

Next, the control of the ground temperature and sprinkling equipment is shown in FIG.
A description will be given based on the electric control system diagram. Connect the grass management computer 19 in the ground keeper room 18, the grass management control board 21 installed in the pump room 20 and the three local control boards 22a, 22b, 22c in the vicinity of the pitch 1 with the information communication cable 23 for multiplex transmission. It is transmitting. The turf management computer 19 not only monitors and controls the water temperature control system, but also the sprinkler system.

First, data of the soil temperature, soil moisture, and the operating state of each control valve from the pitch 1 side are stored in the local control panel 22a,
It is sent to the turf management computer 19 side through 22b and 22c. Further, from the pump room 20, data on each water temperature, water level, and operating state of each device is sent. Based on this information, the turf management computer 19 performs information processing suitable for soil temperature management, soil moisture management, and operation management, and issues control instructions to the turf management control panel 21 and local control panels 22a, 22b, 22c. Turf management control panel
21 and the local control boards 22a, 22b, 22c operate each device according to this instruction.

That is, in the soil temperature management, the target temperature is set for each of the divided blocks 1a to 1e, and a control instruction for heating / cooling is given to the target value to control the soil temperature.

In the soil moisture management, a sprinkling control instruction is periodically output, and water is sprinkled by an automatic lifting type sprinkler to control the soil moisture.

The operation management monitors the state of each device in almost real time, and issues an operation stop and an alarm for the purpose of protecting the device in the event of an abnormality.

The above-mentioned ground temperature control is carried out by a local control panel.
A motor-operated valve 12 that is connected to the header pipe 6a on the inlet side 7 under independent control for each block according to instructions from 22a, 22b, 22c.
The heat medium pipes (the cold water in the summer and the hot water in the winter) to the plurality of heat medium pipes 2 which are opened to open the heat medium pipes 2.
Cooling or heating the ground of pitch 1 in which the
Maintain a suitable soil temperature for natural grass growth.

During this period, the heat source pump 14 is driven to provide a heat medium (cold water in the summer period between the second heat storage tank 4 and a cold / hot water generator for air conditioning of a building, a chiller unit, a boiler, etc., which serves as a heat source. In the winter, hot water is circulated to maintain the temperature of the heat medium in the second heat storage tank 4 at a predetermined temperature.

On the other hand, the heat medium tank 5 is a circulating water tank for supplying cold / hot water (heat medium) to the heat medium pipes 2 in the pitch 1. The heat medium is pumped up from the heat medium tank 5 by the heat medium circulation pump 11, passes through the position of the motor-operated valve 12 through the heat medium pipe 10a, and enters the header pipe 6a on the inlet side 7, from which the heat medium pipe Inflow to 2. Then, cold heat (heat in the winter) is deprived of heat in the ground of the pitch 1 and heat is exchanged, and the heat medium after heat exchange enters the header pipe 6b on the outlet side 8 from which the heat medium pipe is formed.
Normally, the heat medium is returned to the heat medium tank 5 through 10b, and such circulation is repeated to supply the heat medium from the heat medium tank 5 to the heat medium pipe 2.

By the circulation operation between the heat medium tank 5 and the heat medium tube 2, the temperature of the heat medium tank 5 gradually rises in summer (decreases in winter). When the temperature of the heat medium tank 5 measured by the thermometer 29 becomes higher than a certain set temperature (below the set temperature in winter), the heat medium which is the circulating water returned from the pitch 1 side is returned to the heat medium tank 5. Instead, the motor-operated valve 28 is opened and sent to the first heat storage tank 3. Although not shown, a device that can control the opening / closing of the motor-operated valve 28 according to the measurement value of the thermometer 29 is provided.

The first heat storage tank 3 and the second heat storage tank 4 have openings 25.
Since they are communicated with each other, the heat medium flows from the first heat storage tank 3 into the second heat storage tank 4 through the opening 25 by the amount of water of the heat medium flowing into the first heat storage tank 3, and further, The heat medium flows from the second heat storage tank 4 into the heat medium tank 5 through the opening 27 by the amount of this inflow.

The flow of the heat medium from the second heat storage tank 4 to the heat medium tank 5 is surely performed because the backflow is blocked by the communication pipe 13. In this way, since the heat medium of the second heat storage tank 4 whose temperature is set to be lower in summer (higher in winter) flows into the heat medium tank 5, the temperature of the heat medium tank 5 decreases in summer (in winter, To rise. Then, when the temperature falls to a predetermined temperature (in winter, it rises), the circulating water returns to the heat medium tank 5 again. In this way, the temperatures of the first and second heat storage tanks 3 and 4 and the heat medium tank 5 are controlled within a certain range.

As described above, the heat medium supplied to the heat medium pipe 2 is composed of a set of one heat medium pipe 2 with one bent portion, and the inlet side 7 and the outlet side 8 have a constant interval. Therefore, even if a temperature difference of 3 ° C. or more occurs at the peak of heat load between the inlet side 7 before heat exchange and the outlet side 8 after heat exchange, the pitch 1 Almost the same temperature can be obtained 12 to 15 cm below the surface.

The heat medium to the heat medium pipe 2 is the block 1
Supply / stop is performed every a to 1e, and as a result, the ground temperature is controlled for each block. Further, since each heat medium pipe 2 is provided with a manual valve 9 for each one, the heat medium pipes can be independently opened and closed one by one, and even if one heat medium pipe 2 is stopped, the heat medium pipes 2 on both sides are operated. Therefore, the influence on the grass (plant) can be reduced.

In the present embodiment, cold or warm water is used as the heat medium to cool or heat the ground of the pitch 1. However, for example, when only the heating in the severe cold season is required, the heat medium is used. It may be ethylene glycol or the like. Furthermore, the present invention aims to reduce running costs while effectively using energy and resources by using warm waste water from power plants and factories, low temperature water such as groundwater and deep sea water as a heat source or heat medium. Therefore, it is possible to apply not only to turf cultivation but also to maintenance and management of flower gardens and cultivation of agricultural products.

[0046]

As described above, the method and apparatus for controlling the ground temperature of the present invention requires a large-scale facility when a heat medium pipe is installed in the ground of a planting ground for plants such as grass to control the soil temperature. The cost of running is kept low, the amount of heat required for one day can be secured, and it is possible to cope with the peak heat load.

[Brief description of drawings]

FIG. 1 is a system flow diagram showing an embodiment of a ground temperature control method and apparatus of the present invention.

FIG. 2 is a piping diagram of a heat medium pipe showing an embodiment of the soil temperature control method and device of the present invention.

FIG. 3 is an electric / control system diagram showing an embodiment of the ground temperature control method and apparatus of the present invention.

FIG. 4 is a vertical cross-sectional front view of a heat storage tank and a heat medium tank, which are essential parts of an embodiment of the ground temperature control method and apparatus of the present invention.

[Explanation of symbols]

1 ... Pitch (natural grass ground) 1a, 1b, 1c, 1
d, 1e ... Block 2 ... Heat medium pipe 3 ... First heat storage tank 4 ... Second heat storage tank 5 ... Heat medium tanks 6a, 6b ... Header pipe 7 ... Inlet side 8 ... Outlet side 9 ... Manual valves 10a, 10b Heat medium piping 11 Heat medium circulation pump 12 Motorized valve 13 Communication pipe 14 Heat source pump 15 Supply pipe 16 Thermometer 17 Flow meter 18 Groundkeeper room 19 Turf management computer 20 Pump room 21 Lawn management control panels 22a, 22b, 22c ... Local control panel 23 ... Information communication cable 24 ... Partition plate 25 ... Opening 26 ... Partitioning plate 27 ... Opening 28 ... Motorized valve 29 ... Thermometer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masayuki Yanagi             Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo             Inside the corporation

Claims (4)

[Claims] 1. In a soil temperature control system in which a heat medium pipe is buried in a planted land, and the heat medium pipe is connected to the heat medium pipe to circulate the heat medium in the heat medium pipe, a heat storage tank is provided in the heat medium tank. A heat storage tank that is connected and flows into the heat storage tank according to the set value of the temperature of the heat medium tank to return to the heat medium tank, and has a temperature difference set to a temperature lower or higher than the heat medium tank. A method for controlling the ground temperature, characterized in that the heat medium inside is supplied to a heat medium tank, and after the temperature of the heat medium tank is restored to a set value, the circulating heat medium is returned to the heat medium tank again. 2. The ground temperature control method according to claim 1, wherein when supplying the heat medium from the heat storage tank to the heat medium tank, the same amount of heat medium as the heat medium flowing into the heat storage tank automatically flows out. 3. A soil temperature control device for use in a soil temperature control system in which a heat medium pipe is embedded in a planting area, a heat medium tank is connected to the heat medium pipe to circulate the heat medium in the heat medium pipe, A ground temperature control characterized in that a heat storage tank is connected to the heat medium tank via a communication section, and a valve body is provided in the communication section so that the heat medium flows only from the heat storage tank side to the heat medium tank side. apparatus. 4. The heat storage tank comprises a first heat storage tank and a second heat storage tank communicating with the first heat storage tank. A heat source is connected to the second heat storage tank to connect the second heat storage tank to the heat medium tank. The ground temperature control device according to claim 3, further comprising a heat medium pipe connected to the first heat storage tank.