JP2005248673A - Road heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road heating system having a high efficiency by minimizing the running cost while reducing its environmental load. <P>SOLUTION: This road heating system 1 comprises a first heat exchange medium passage 3 installed to an area 2 whereto solar light is radiated, its one end 5b is laid underground and connected to one end 3b of a second heat exchange medium passage 5 in an area 4 which is not radiated by the solar light, another end 3a of the first heat exchange medium passage and another end 5a of the second heat exchange medium passage are connected together by a third heat exchange medium passage 7; and a medium-sending pressure pump 8 for circulating the heat exchange medium from the first heat exchange medium passage 3 to the second heat exchange medium passage 5 is installed through the third heat exchange medium passage 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a road heating system that circulates a heat exchange medium in a flow path, thereby warming a ground surface in which the flow path is embedded to perform freezing and snow melting.

A road heating system that embeds a flow path in the ground surface and circulates a heat exchange medium at least higher than the ground surface temperature in the flow path to eliminate or prevent freezing of the ground surface and to melt snow on the ground surface. It has been known. In general, since the heat exchange medium is heated using a heating source such as a water heater when the system is operated, the running cost during system operation is a problem.
Some road heating systems do not use a water heater or the like as a heating source. For example, Patent Document 1 provides a first circulation path for circulating primary circulating water as a heat exchange medium on a region heated by sunlight, and circulates secondary circulating water in the ground on the freezing side. A system is proposed in which the second circulation path is embedded, a part of the first circulation path and a part of the second circulation path are introduced into the heat pump, and the secondary circulation water is heated by the heat of the primary circulation water. Has been.

JP2004-12115

In Patent Document 1, since a water heater or the like is not used as a heating source, the running cost can be suppressed, but the temperature of the secondary circulating water depends on the performance of the heat pump, so a high-performance heat pump is required and the initial cost is low. It will be high. Further, at night when there is no sunlight, the temperature of the primary circulating water may not be sufficient, and there is a concern that the temperature of the secondary circulating water cannot be sufficiently increased. From the viewpoint of reducing environmental impact and running costs, it is desirable to use natural energy while minimizing the use of fossil fuel, electricity, gas, etc. when operating the road heating system.
An object of the present invention is to provide an efficient road heating system that reduces the environmental load while reducing the running cost.

  The invention of claim 1 is embedded in the ground of the first heat exchange medium flow path disposed in the area irradiated with sunlight and the area not irradiated with sunlight, and one end thereof is the first heat. A third heat exchange medium flow path connected to one end of the exchange medium flow path, a third heat coupling medium connecting the other end of the first heat exchange medium flow path and the other end of the second heat exchange medium flow path. The heat exchange medium flow path and the third heat exchange medium flow path are disposed in the first heat exchange medium flow path to the second heat exchange medium flow path via the third heat exchange medium flow path. And a medium pressure pump for circulating the heat exchange medium.

  According to a second aspect of the present invention, in the road heating system according to the first aspect of the present invention, the surface temperature of the region not irradiated with sunlight, the temperature of the heat exchange medium passing through the second heat exchange medium flow path, or the first A first temperature detection means for detecting the temperature of the heat exchange medium that has passed through the two heat exchange medium flow paths, and a control means for controlling the drive of the medium pressure pump, wherein the control means is a first temperature detection means. The medium pressure pump is driven when the detected temperature from the temperature reaches a predetermined temperature set in advance.

According to a third aspect of the present invention, in the road heating system according to the first or second aspect, an underground heat collecting section is provided in the middle of the third heat exchange medium flow path.
According to a fourth aspect of the present invention, in the road heating system according to the third aspect of the present invention, the load heating system according to the third aspect is provided in a bypass flow path that connects a third heat exchange medium flow path located upstream and downstream of the underground heat collecting section. The electromagnetic on-off valve and the surface temperature of the area irradiated with sunlight, the temperature of the heat exchange medium passing through the first heat exchange medium flow path, or the heat exchange passing through the first heat exchange medium flow path Second temperature detecting means for detecting the temperature of the medium, the temperature in the underground heat collecting section, the temperature of the heat exchange medium passing through the underground heat collecting section, or the heat passed through the underground heat collecting section A heat collection temperature detection means for detecting the temperature of the exchange medium, and the underground heat collection section is connected to a bypass flow path downstream of the electromagnetic on-off valve in the medium conveyance direction, and the control means is a second temperature detection The detection temperature from the means and the detection temperature from the heat collection temperature detection means are compared to determine the heat collection temperature detection. When the detected temperature from the means is higher than the detected temperature from the second temperature detecting means, the solenoid on-off valve is controlled to open, and the detected temperature from the heat collection temperature detecting means is higher than the detected temperature from the second temperature detecting means. If it is lower, the electromagnetic on-off valve is controlled to be closed.

A fifth aspect of the present invention is the load heating system according to any one of the first to fourth aspects, wherein the storage is provided in connection with the third heat exchange medium flow path and stores a part of the circulating heat exchange medium. And an auxiliary heat source supply means for heating the heat exchange medium stored in the storage unit and returning the heated heat exchange medium to the storage unit.
A sixth aspect of the present invention is the road heating system according to the fifth aspect, wherein the auxiliary heat source supply means includes a heater connected to the storage section via the flow path, and a heat exchange medium in the storage section provided in the flow path. And an auxiliary heat source drive pump for supplying pressure to the heater, and the control means is at least in a state where the medium pressure pump is in a drive state, and the detected temperature from the temperature detecting means is less than a preset predetermined temperature. The driving pump for the auxiliary heat source is driven.

  According to the present invention, the second heat exchange medium in which one end of the first heat exchange medium flow path disposed in the area irradiated with sunlight is embedded in the ground of the area not irradiated with sunlight. The heat exchange medium is connected to one end of the flow path, and the other end of the first heat exchange medium flow path and the other end of the second heat exchange medium flow path are connected by the third heat exchange medium flow path. Is circulated by the medium pressure pump, the heat exchange medium passing through the first heat exchange medium flow path absorbs the heat of the ground surface heated by sunlight and the underground heat in the area, The warmed heat exchange medium is supplied directly to the second heat exchange medium flow path. For this reason, since it is not necessary to use a heat pump as in the prior art, the heat exchange medium can be efficiently supplied into the second heat exchange medium flow path while suppressing an increase in cost, while reducing the environmental load. Prevents freezing of the ground surface, freezing and snow melting.

  According to the present invention, the ground surface temperature of the region not irradiated with sunlight or the heat that has passed through the second heat exchange medium flow path correlated with the temperature or passed through the second heat exchange medium flow path. When the temperature of the exchange medium is detected by the first temperature detecting means and the detected temperature reaches a predetermined temperature, the medium pressure pump is driven by the control means, so that the useless driving of the medium pressure pump is suppressed. However, when necessary, a warm heat exchange medium can be supplied from the first heat exchange medium flow path to the second heat exchange medium flow path, and efficient circulation of the heat exchange medium while reducing running costs. It is possible to prevent or freeze the ground surface and to melt snow while further reducing the environmental burden.

  According to the present invention, since the underground heat collection section is provided in the middle of the third heat exchange medium flow path, the heat exchange medium flowing through the third heat exchange medium flow path is the underground heat collection section. Heated by the collected heat. For this reason, the temperature reduction of the heat exchange medium in the third heat exchange medium flow path can be suppressed, and the heat exchange medium can be supplied to the second heat exchange medium flow path while maintaining the medium temperature. While reducing the load, it can stably prevent freezing of the ground surface, freezing, and melting snow.

  According to the present invention, the temperature of the region irradiated with sunlight, the temperature of the heat exchange medium passing through the first heat exchange medium flow path correlated with the temperature, or the first heat exchange medium flow path Exchange temperature detected by the second temperature detecting means for detecting the temperature of the heat exchange medium that has passed through, and the temperature in the underground heat collecting section or the underground heat collecting section correlated with the temperature. Or the detected temperature from the heat collecting temperature detecting means for detecting the temperature of the heat exchange medium that has passed through the underground heat collecting section, and the detected temperature from the heat collecting temperature detecting means is the second temperature detecting means. When the temperature is higher than the detected temperature from, the electromagnetic on-off valve provided in the bypass flow path connecting the upstream side and downstream side third heat exchange medium flow path of the underground heat collection unit is controlled to open, When the detected temperature from the heat collection temperature detecting means is lower than the detected temperature from the second temperature detecting means Since the switching control for closing the electromagnetic on-off valve is performed, the temperature of the area irradiated with sunlight decreases, and the amount of heat absorbed by the heat exchange medium during circulation in the first heat exchange medium flow path is reduced. Even if the electromagnetic on-off valve is opened, the heat exchange medium is guided into the underground heat collecting section that is higher than the temperature of the region irradiated with sunlight, and the temperature drop of the heat exchange medium is suppressed. For this reason, since the heat exchange medium can absorb heat from the ground even when there is a temperature fluctuation in the region where the first heat exchange medium flow path is provided, the ground surface can be prevented from freezing and freezing, and snow melting more stably. Can be done.

  According to the present invention, the storage section provided in connection with the third heat exchange medium flow path and storing a part of the circulating heat exchange medium, the heat exchange medium in the storage section is heated, and the heat after the heating Since there is an auxiliary heat source supply means for returning the exchange medium to the storage section, heat exchange is performed during circulation in the first heat exchange medium flow path, circulation in the underground heat collection section, or circulation through both. Even if the amount of heat absorbed by the medium is reduced, the heat exchange medium is heated when passing through the auxiliary heat source supply means. For this reason, even when there is a change in the area irradiated with sunlight or the temperature in the ground, the heat exchange medium can be warmed stably, and the ground surface can be prevented from freezing, freezing and snow melting more stably.

  According to the present invention, the auxiliary heat source supply means includes a heater connected to the storage section via the flow path, and an auxiliary heat source drive that supplies the heat exchange medium provided in the flow path to the heater. And the control means drives the auxiliary heat source drive pump when the detected temperature from the first temperature detection means does not reach a predetermined temperature at least in the drive state of the medium pressure pump. Therefore, only when the amount of heat absorbed by the heat exchange medium is reduced during circulation in the first heat exchange medium flow path, circulation in the underground heat collecting section, or circulation through both of them, to the heater The heat exchange medium is supplied to the heat exchange medium while reducing the frequency of use of the heater as much as possible. Antifreeze and freezing of the surface, Perform the snow.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each embodiment, members, components, and the like having the same function and shape are given the same reference numerals, and description thereof is omitted as much as possible.

(First embodiment)
In FIG. 1, reference numeral 1 denotes a load heating system to which the present invention is applied. In this load heating system, the first heat exchange medium flow path 3 disposed in the region by being embedded in the sunshine 2 as the region to which the sunlight 15 is irradiated, and the sunlight 15 are irradiated. The second heat exchange medium flow path 5 embedded in the ground of the shaded area 4 that is not frozen and has snow and snow, and the second heat exchange with one end 3b of the first heat exchange medium flow path 3 A connection flow path 6 that connects one end 5 b of the medium flow path 5, and a third connection that connects the other end 3 a of the first heat exchange medium flow path 3 and the other end 5 a of the second heat exchange medium flow path 5. The heat exchange medium flow path 7 and the third heat exchange medium flow path 7 are connected to the first heat exchange medium flow path 3 through the connection flow path 6 and the second heat exchange medium flow path 7. A medium pressure pump 8 that circulates brine water as a heat exchange medium to the exchange medium flow path 5 and a first temperature detection that detects the ground surface temperature t1 of the shaded area 4. A temperature sensor 9 as a means, and a control unit 20 for controlling the driving of the medium feeding pressure pump 8.

  In the present embodiment, the shaded area 4 is described as a shaded part of the building 16, but is not limited to such a place. For example, the northern slope of the sloped area, the area where the sunlight during the day is not inserted on the same road surface or site Etc. The region irradiated with the sunlight 15 is not limited to the sunshine 2 and includes, for example, the roof 17 of the building 16, the rooftop, the wall surface, and the like.

  The first heat exchange medium flow path 3 is a tube made of crosslinked polyethylene excellent in cold resistance, and is configured by arranging this tube continuously over substantially the entire area of the sunshine 2 at an equal interval pitch. Yes. In the second heat exchange medium flow path 5, the pipe material is arranged continuously over the substantially whole area in the shaded area 4 at an equal interval pitch. The connection flow path 6 and the third heat exchange medium flow path 7 are also made of a tube material as described above. In this embodiment, an Excel pipe manufactured by Mitsubishi Chemical Corporation is used as the pipe material, but the present invention is not limited to this.

  The other end 3a of the first heat exchange medium flow path 3 and the other end 5a of the second heat exchange medium flow path 5 are connected to well-known headers 10 and 11 that function as a collecting pipe connecting portion, respectively. Both ends 6a and 6b of the connection flow path 6 are connected to the headers 10 and 11, respectively, and the other end sides of the first heat exchange medium flow path 3 and the second heat exchange medium flow path 5 are communicated. Yes. The other end 3a of the first heat exchange medium flow path 3 and the other end 5a of the second heat exchange medium flow path 5 are connected to well-known headers 12 and 13, respectively, which function as a collecting pipe connecting portion. Both ends 7a and 7b of the third heat exchange medium flow path 7 are connected to the headers 12 and 13, respectively, and the other ends of the first heat exchange medium flow path 3 and the second heat exchange medium flow path 5 are connected. The side is in communication.

  The medium pressure pump 8 is an electrically driven pump, and has a flow path 71 connecting the suction side to the other end 3a of the first heat exchange medium flow path 3, and a discharge side of the second heat exchange medium flow path 5. The brine water is connected to the flow path 72 connected to the other end 5a of the first heat exchange medium flow path 3 so that the brine water is circulated in the direction of flowing from the other end 5a of the first heat exchange medium flow path 3 into the second heat exchange medium flow path 5. Yes. Arrow a in the figure indicates the circulation direction of brine water. Before connecting the discharge side of the medium pressure pump 8 to the flow path 71, the brine water is filled in the flow path in advance by inserting and driving the pump suction side into a container in which brine water is stored. . Alternatively, a replenishment port that can be sealed is provided in the flow path 71, and the flow path 71 may be filled from there.

  The control means 20 includes a CPU (central processing unit), an I / O (input / output) port, a ROM (read-only storage device), a RAM (read / write storage device), a timer, and the like, which are not shown. Are configured by a well-known computer having a configuration connected by a signal bus. A temperature sensor 9 and a main switch 21 for turning on / off the control means 20 are electrically connected to the input side of the control means 20, and a medium pressure pump 8 is electrically connected to the output side. In the ROM of the control means 20, a predetermined temperature t that is a parameter for turning on / off the drive of the medium pressure pump 8 is set in advance. The predetermined temperature t is set to an allowable set temperature in a range of 1 ° C to 5 ° C. The predetermined temperature t is preferably set from the above range as appropriate in consideration of the installation conditions of the system. The control means 20 performs on / off control of driving of the medium pressure pump 8 based on the local temperature (ground surface temperature) t1 detected by the temperature sensor 9.

  The operation of the load heating having such a configuration will be described with reference to the flowchart shown in FIG. This system functions by turning on the main switch 21 in step C1 of FIG. In step C1, when the main switch 21 is turned on (turned on), the process proceeds to step C2, and it is determined whether or not the ground surface temperature t1 from the temperature sensor 9 is lower than the predetermined temperature t. When the ground surface temperature t1 is lower than the predetermined temperature t, the surface temperature of the shaded ground 4 is low, and the medium pressure pump 8 is turned on by proceeding to step C3 assuming that the surface of the shaded ground 4 is low, freezing or freezing, or in a snowy state. When the medium pressure pump 8 is turned on, the brine water in each flow path starts circulating in the pipe.

  And if brine water flows in into the flow path from the one end 3b of the 1st heat exchange medium flow path 3, it will absorb the heat of the surface of the sunshine 2 heated by sunlight, and underground heat, and will 1st The second heat exchange medium flow path is conveyed from the other end 3a of the heat exchange medium flow path 3 to the other end 5a of the second heat exchange medium flow path 5 via the third heat exchange medium flow path 7. 5 is introduced. The introduced brine water moves in the second heat exchange medium flow path 5 toward the one end 5b. During this movement, the heat of the brine water is transmitted to the surface of the shaded area 4 to warm the shaded area 4. The brine water that has moved in the second heat exchange medium flow path 5 escapes from the one end 5b in the second heat exchange medium flow path 5 and returns to the first heat exchange medium flow path 3 through the connection flow path 6. Is returned.

  After the medium pressure pump 8 is turned on, the control means 20 periodically takes in information from the temperature sensor 9, and in step C4, the ground surface temperature t1 that is the detected temperature from the temperature sensor 9 is a predetermined temperature t. It is judged whether it is higher. When the ground surface temperature t1 is higher than the predetermined temperature t, it is assumed that the shaded ground 4 has been warmed by the heat of the brine water, the process proceeds to Step C5, the drive of the medium pressure pump 8 is turned off, and the process proceeds to Step C6. In step C6, the OFF state of the main switch 21 is determined. If it is not OFF, the process returns to step C2, and the series of operations from step C2 to step C6 and determination are repeated. If the main switch 21 is off in step C6, the control is terminated assuming that the system is not used.

  Thus, when the medium pressure pump 8 is turned on and the brine water circulates, when passing through the first heat exchange medium flow path 3, the heat of the ground surface heated by sunlight and The brine heat is absorbed by the brine water and warmed, and the warmed brine water is supplied to the second heat exchange medium flow path 5. For this reason, it is not necessary to use an expensive heat pump as in the prior art, and the increase in cost can be suppressed, and brine water can be efficiently supplied into the second heat exchange medium flow path 5 and freezing of shaded areas can be eliminated. It can melt snow together with prevention. Further, the surface temperature t1 of the shaded area 4 is detected by the temperature sensor 9, and when the temperature is lower than the predetermined temperature t set in advance, the medium pressure pump 8 is turned on, and the ground surface temperature t1 becomes the predetermined temperature t. Since the medium pressure pump 8 is turned off at a higher temperature, warm brine water can be supplied from the first heat exchange medium flow path 3 to the second heat exchange medium flow path 5 only when necessary, Thus, it is possible to circulate the brine water, reduce unnecessary pump driving, reduce energy consumption in the road heating system, and reduce running costs while reducing environmental load.

  In the present embodiment, the temperature sensor 9 as the first temperature detecting means for detecting the ground surface temperature t1 of the shaded area 4 is installed in the shaded area 4. However, the present invention is not limited to such a form. The temperature of the brine water that is provided on one end 6a side of the path 6 and passes through the second heat exchange medium flow path 5 is detected, and the control means 20 performs on / off control of the medium pressure pump 8 based on the temperature information. Alternatively, a temperature sensor 9 is provided in the second heat exchange medium flow path 5, and the temperature of the brine water passing through the second heat exchange medium flow path 5 is detected, and the temperature information is On the basis of this, on / off control of the medium pressure pump 8 may be performed by the control means 20.

(Second Embodiment)
In this embodiment, the structure of the underground heat collecting unit 30 is added to the structure of the first embodiment. The underground heat collection unit 30 is provided in the middle of the third heat exchange medium flow path 7. The underground heat collection unit 30 is composed of a ground heat exchange well 31 provided substantially vertically in the ground, and a pipe, and is a U-shaped channel inserted into the underground heat exchange well 31. 32. Inside the underground heat exchanging well 31, a temperature sensor 37 is provided as a heat collection temperature detecting means for detecting the temperature (underground temperature) t2 of the underground heat exchanging well 31.

  In the third heat exchange medium flow path 7, a bypass flow path 73 that connects the upstream side and the downstream side of the underground heat collecting unit 30 is connected to the flow path 71 upstream of the medium feed pump 8 in the medium conveyance direction. Is provided. The bypass channel 73 is provided with an electromagnetic open / close valve 35. Downstream of the electromagnetic on-off valve 35 in the medium conveyance direction, both ends of the U-shaped flow path 32 are connected via headers 33 and 34, and when the electromagnetic on-off valve 35 is opened, brine water is generated. It is configured to circulate through the U-shaped channel 32. The sunshine 2 is provided with a temperature sensor 36 as second temperature detecting means for detecting the ground surface temperature t3.

  The control means 40 used in this embodiment is composed of a known computer having a CPU, an I / O (input / output) port, a ROM, a RAM, a timer, and the like. The temperature sensor 9, 36, 37 and the main switch 21 for turning on / off the control means 40 are electrically connected to the input side of the control means 40, and the medium pressure pump 8 and the electromagnetic on-off valve 35 are electrically connected to the output side, respectively. It is connected to the. In the ROM of the control means 40, a predetermined temperature t, which is a parameter for turning on / off the drive of the medium pressure pump 8, is preset.

  The control means 40 performs on / off control of the drive of the medium pressure pump 8 based on the local temperature (ground surface temperature) t1 detected by the temperature sensor 9, and based on the detected temperatures t3 and t2 detected by the temperature sensors 36 and 37. The opening / closing of the opening / closing electromagnetic valve 35 is controlled.

  In this embodiment, it functions by turning on the main switch 21 in step D1 of FIG. In step D1, when the main switch 21 is turned on (turned on), the routine proceeds to step D2, where it is determined whether or not the ground surface temperature t1 from the temperature sensor 9 is lower than the predetermined temperature t. When the ground surface temperature t1 is lower than the predetermined temperature t, the surface temperature of the shaded ground 4 is low, and the medium pressure pump 8 is turned on by proceeding to step D3 assuming that the surface temperature of the shaded ground 4 is low, freezing or freezing, or snowy. When the medium pressure pump 8 is turned on, the brine water in each flow path starts circulating in the pipe.

  When brine water flows from one end 3b of the first heat exchange medium flow path 3 into the flow path, the heat of the ground surface heated by sunlight and the underground heat are absorbed, and the first heat exchange medium flow It is conveyed from the other end 3a of the path 3 to the other end 5a of the second heat exchange medium flow path 5 via the third heat exchange medium flow path 7 and introduced into the second heat exchange medium flow path 5. Is done. The introduced brine water moves in the second heat exchange medium flow path 5 toward the one end 5b. During this movement, the heat of the brine water is transmitted to the shaded area 4 to warm the shaded area 4. The brine water that has moved in the second heat exchange medium flow path 5 escapes from one end 5a in the second heat exchange medium flow path 5 and again passes through the connection flow path 6 to the first heat exchange medium flow path 3. Returned to.

  In step D4, the ground surface temperature t3 that is the detected temperature from the temperature sensor 36 is compared with the underground temperature t2 that is the detected temperature from the temperature sensor 37, and the underground temperature t2 from the temperature sensor 37 is the temperature sensor. When it is higher than the ground surface temperature t3 from 36, the routine proceeds to step D5, where the electromagnetic on-off valve 35 is turned on and opened. When the electromagnetic opening / closing valve 35 is opened, brine water is introduced from the flow path 71 through the bypass flow path 73 into the U-shaped flow path 32. The introduced brine water absorbs geothermal heat while passing through the U-shaped channel 32, so that it can be sufficiently warmed even when the first heat exchange medium channel 3 cannot absorb sufficient heat at night or the like. Then, it flows from the bypass flow path 73 to the second heat exchange medium flow path 5 via the flow path 72. For this reason, even in an environment where there is a temperature fluctuation on the first heat exchange medium flow path 3 side, the temperature drop of the brine water is suppressed, and snow melting can be performed more stably while preventing freezing of the ground surface and freezing. .

  In step D6, it is determined whether or not the underground temperature t2 from the temperature sensor 37 is lower than the ground surface temperature t3 from the temperature sensor 36. If the underground temperature t2 is lower, the process proceeds to step D7 and the electromagnetic on-off valve 35 is turned off. Then close it. That is, when the ground surface temperature t3 is higher than the underground temperature t2, when the brine water heated through the first heat exchange medium flow path 3 is introduced into the U-shaped flow path 32, the temperature is reduced. In such a state, it is assumed that it is not introduced into the U-shaped flow path 32 but directly flows into the second heat exchange medium flow path 5 in terms of thermal efficiency. preferable.

  When the electromagnetic opening / closing valve 35 is closed, the routine proceeds to step D8, where it is determined whether or not the ground surface temperature t1 from the temperature sensor 9 is higher than the predetermined temperature t. When the ground surface temperature t1 is higher than the predetermined temperature t, it is assumed that the shaded ground 4 has been warmed by the heat of the brine water, the process proceeds to Step D9, the drive of the medium pressure pump 8 is turned off, and the process proceeds to Step D10. In step D10, the OFF state of the main switch 21 is determined. If it is not OFF, the process returns to step D2, and the series of operations from step D2 to step D10 and determination are repeated. If the main switch 21 is off in step D10, the control is terminated assuming that the system is not used.

  In the present embodiment, the temperature sensor 37 as a heat collection temperature detecting means for detecting the underground temperature is provided in the underground heat exchange well 31, but is not limited to such a configuration. For example, the header 34 or the header 34 may be provided on a bypass flow path that connects the medium pressure pump 8.

  A temperature sensor 36 is provided in the sunshine 2 as the second temperature detecting means for detecting the ground surface temperature of the sunshine 2, but is provided in the first heat exchange medium flow path 3 and passes through the flow path. The temperature of the brine water that has passed through the first heat exchange medium flow path 3 provided in the flow path 71, that is, the temperature of the brine water in the third heat exchange medium flow path 7 is detected. Also good.

  That is, as a function of the temperature sensor 37, the brine water that has passed through the U-shaped flow path 32 or the U-shaped flow path 32 as the heat collecting pipe of the underground heat exchange well 31 correlated with the underground temperature. The temperature sensor 36 only needs to be able to detect the temperature. The temperature sensor 36 only needs to be able to detect the surface temperature of the sunshine 2 or the temperature of the brine water passing through or passing through the first heat exchange medium flow path 3.

  In this embodiment, the underground temperature t2 and the ground surface temperature t3 are compared, and the opening and closing of the electromagnetic valve 35 is controlled according to the result. However, another control form may be used. For example, the temperature sensor 36 is provided in the flow path 71 so as to detect the temperature of the brine water heated through the first heat exchange medium flow path 3, and the temperature sensor 37 is connected to the header 34 and the medium pressure pump 8. In the case of detecting the temperature of the brine water that is provided in the flow path connecting the two and heated by the underground heat, the temperature information (detected temperature) from both sensors is compared, and the temperature information from the temperature sensor 37 is the temperature sensor. When the temperature information from the temperature sensor 37 is lower than the temperature information from the temperature sensor 36, the electromagnetic lower on-off valve 35 is opened. You may make it control by the control means 40. FIG.

(Third embodiment)
In this embodiment, as shown in FIG. 6, in the configuration of the second embodiment, the storage unit 51 that stores a part of brine water and the brine water stored in the storage unit 51 are heated, The configuration of the auxiliary heat source supply means 50 for returning the brine water to the storage unit 51 is added.

  The storage unit 51 is provided in a flow path 72 that constitutes a part of the third heat exchange medium flow path 7 and stores brine water discharged from the medium pressure pump 8. The auxiliary heat source supply means 50 gasses the brine water in the reservoir 51 provided in the channel 52 and a gas water heater 54 that is one form of a heater connected to the reservoir 51 via the channels 52 and 53. And an auxiliary heat source drive pump 55 for supplying pressure to the water heater 54. The flow path 52 constitutes an introduction path for the gas water heater 54, and the flow path 53 constitutes a discharge path from the hot water heater 54. The reason why the gas water heater 54 is used as the heater is because of its high versatility and low cost. Therefore, in this embodiment, in order to introduce the brine water to the gas water heater 54, a pump having a discharge pressure higher than that of the medium pressure pump 8 is used as the auxiliary heat source drive pump 55 separately from the medium pressure pump 8. Yes. The heater is not limited to the gas water heater 54, and examples thereof include a heat pump chiller, an electric water heater, and a boiler such as kerosene.

  The reason why the flow path 53 serving as a discharge path for the heated brine water is not directly connected to the flow path 72 is that the brine water heated by the gas water heater 54 is directly connected to the second heat exchange medium flow path 5 having a low temperature. This is because if it flows, the heat load on the shaded area 4 in which the second heat exchange medium flow path 5 is embedded may become too large. For example, when the shaded ground 4 is concrete and the surface is frozen, the temperature of the brine water heated by the gas water heater 54 is about 60 ° C., and this is used as the second heat. If it is introduced into the exchange medium flow path 5, the occurrence of cracks or the like can be considered due to the temperature difference from the concrete. In order to prevent such a phenomenon from occurring, in this embodiment, the brine water heated by the water heater 54 is returned into the storage unit 51 and mixed with the brine water discharged from the medium pressure pump 8 to adjust the temperature. ing. Moreover, the storage part 51 is provided with the function which absorbs the difference of the discharge pressure of each pump. The reservoir 51 is preferably provided with a pressure adjusting valve for keeping the pressure at least constant with the pressure supplied by the medium pressure pump 8 in the reservoir 51. S

  The control means 60 used in this embodiment is composed of a known computer having a CPU, an I / O (input / output) port, a ROM, a RAM, a timer, and the like. As shown in FIG. 7, the temperature sensors 9, 36, 37 and the main switch 21 for turning on / off the control means 60 are provided on the input side of the control means 60, and the medium pressure pump 8, electromagnetics are provided on the output side. The on-off valve 35, the ignition switch of the gas water heater 54, and the auxiliary heat source drive pump 55 are electrically connected to each other. In the ROM of the control means 60, a predetermined temperature t that is a parameter for turning on / off the drive of the medium pressure pump 8 is preset.

  The control means 60 controls on / off of driving of the medium pressure pump 8 based on the local temperature (ground surface temperature) t1 detected by the temperature sensor 9, and opens and closes electromagnetic waves based on the detected temperatures t3 and t2 detected by the temperature sensors 36 and 37. Control is performed so that the auxiliary heat source drive pump 55 is driven when the detected temperature t1 from the temperature sensor 9 is less than the predetermined temperature t in the open / close control of the valve 35 and at least the medium pressure pump 8 is in the drive state.

  This system functions by turning on the main switch 21 in step E1 of FIG. In step E1, when the main switch 21 is turned on (turned on), the process proceeds to step E2 where it is determined whether or not the ground surface temperature t1 from the temperature sensor 9 is lower than the predetermined temperature t. When the ground surface temperature t1 is lower than the predetermined temperature t, the surface temperature of the shaded ground 4 is low, and the medium pressure pump 8 is turned on by proceeding to step E3 assuming that the surface of the shaded ground 4 is low, freezing or freezing, or in a snowy state. When the medium pressure pump 8 is turned on, the brine water in each flow path starts circulating in the pipe.

  When brine water flows from one end 3b of the first heat exchange medium flow path 3 into the flow path, the heat of the ground surface heated by sunlight and the underground heat are absorbed, and the first heat exchange medium flow It is conveyed from the other end 3a of the path 3 to the other end 5a of the second heat exchange medium flow path 5 via the third heat exchange medium flow path 7 and introduced into the second heat exchange medium flow path 5. Is done. The introduced brine water moves in the second heat exchange medium flow path 5 toward the one end 5b. During this movement, the heat of the brine water is transmitted to the shaded area 4 to warm the shaded area 4. The brine water that has moved in the second heat exchange medium flow path 5 escapes from one end 5a in the second heat exchange medium flow path 5 and again passes through the connection flow path 6 to the first heat exchange medium flow path 3. Returned to.

  In step E4, the ground surface temperature t3 that is the detected temperature from the temperature sensor 36 is compared with the underground temperature t2 that is the detected temperature from the temperature sensor 37, and the underground temperature t2 from the temperature sensor 37 is the temperature sensor. When it is higher than the ground surface temperature t3 from 36, the routine proceeds to step D5, where the electromagnetic on-off valve 35 is turned on and opened. When the electromagnetic opening / closing valve 35 is opened, brine water is introduced from the flow path 71 through the bypass flow path 73 into the U-shaped flow path 32. The introduced brine water absorbs geothermal heat while passing through the U-shaped channel 32, so that it can be sufficiently warmed even when the first heat exchange medium channel 3 cannot absorb sufficient heat at night or the like. Then, it flows from the bypass flow path 73 to the second heat exchange medium flow path 5 through the storage portion 51 and the flow path 72. For this reason, even if there is a temperature fluctuation on the first heat exchange medium flow path 3 side, the temperature drop of the brine water is suppressed, and the freezing of the ground surface and snow melting can be performed more stably.

  When the electromagnetic opening / closing valve 35 is turned on, the routine proceeds to step E6, where it is determined again whether or not the ground surface temperature t1 from the temperature sensor 9 is lower than the predetermined temperature t. When the ground surface temperature t1 is lower than the predetermined temperature t, the surface temperature of the shaded ground 4 is low even if the brine water is introduced into the underground heat collecting unit 30 and collected, and the brine water moves to the shaded ground 4 from the brine water. Assuming that the amount of heat supplied is insufficient, the routine proceeds to step E7 where the auxiliary heat source drive pump 55 is turned on and the ignition switch is turned on to operate the gas water heater 54. When the auxiliary heat source drive pump 55 is activated, the brine water accumulated in the reservoir 51 is supplied from the flow path 52 into the gas water heater 54 and is overheated by passing through the activated gas water heater 54. Then, it can return to the reservoir 51 via the flow path 53. The brine water heated by the gas water heater 54 is mixed with the brine water accumulated in the reservoir 51, adjusted in temperature, and flows to the second heat exchange medium channel 5 via the channel 72. For this reason, since brine water is supplied to the 2nd heat exchange medium flow path 5 in the state in which the heat load with respect to the shaded area 4 was suppressed, the shaded area 4 is warmed without generating the malfunction by a heat load.

  In step E8, it is determined whether or not the ground surface temperature t1 from the temperature sensor 9 is higher than a predetermined temperature t. When the ground surface temperature t1 is higher than the predetermined temperature t, the shaded ground 4 is assumed to have been heated by the heat of the brine water heated by the water heater 54, and the process proceeds to Step E9 to turn off the auxiliary heat source drive pump 55. The water heater 54 is stopped and the process proceeds to Step E10.

  As described above, the water heater 54 operates when the amount of heat collected from the sunshine 2 and the underground heat collecting unit 30 is reduced, or when the ground surface temperature of the shaded ground 4 is extremely low. While reducing the frequency of use as much as possible, the necessary amount of heat can be given to the brine water, and the shaded area 4 can be stably prevented from freezing, defrosting, and melting snow while further reducing running costs and environmental loads.

  In step E10, it is determined whether or not the underground temperature t2 from the temperature sensor 37 is lower than the ground surface temperature t3 from the temperature sensor 36. If lower, the process proceeds to step E11 and the electromagnetic on-off valve 35 is turned off. And close. That is, when the ground surface temperature t3 is higher than the underground temperature t2, when the brine water heated through the first heat exchange medium flow path 3 is introduced into the U-shaped flow path 32, the temperature is reduced. In such a state, it is assumed that it is not introduced into the U-shaped flow path 32 but directly flows into the second heat exchange medium flow path 5 in terms of thermal efficiency. preferable.

  When the electromagnetic opening / closing valve 35 is closed, the routine proceeds to step E12, where it is determined whether or not the ground surface temperature t1 from the temperature sensor 9 is higher than the predetermined temperature t. When the ground surface temperature t1 is higher than the predetermined temperature t, it is assumed that the shaded ground 4 has been warmed by the heat of the brine water, the process proceeds to Step E13, the drive of the medium pressure pump 8 is turned off, and the process proceeds to Step E14. In step E14, the OFF state of the main switch 21 is determined. If it is not OFF, the process returns to step E2, and the series of operations and determinations from steps E2 to E14 are repeated. If the main switch 21 is off in step E14, the control is terminated assuming that the system is not used.

  In this embodiment, the auxiliary heat source drive pump 55 is turned off and the gas water heater 54 is stopped according to the ground surface temperature t1 from the temperature sensor 9. A temperature sensor 38 serving as a medium temperature detecting means for detecting the temperature of the brine water in the storage section is provided in the flow path 72 connecting to the heat exchange medium flow path 5, and the medium set temperature is stored in the ROM of the control means 60. Even when the temperature of the brine water (detected temperature) detected by the temperature sensor 38 reaches the medium set temperature, the auxiliary heat source drive pump 55 is turned off and the water heater 54 is stopped. good.

  Also in the present embodiment, as described in the first and second embodiments, the position of each temperature sensor is changed, and based on the detected temperature (temperature information) from the temperature sensor whose installation position or detection target is changed. Each drive unit may be controlled by the control means 60.

(Fourth embodiment)
FIG. 9 shows a mode in which the control for the medium pressure pump 8 is different from that in the first embodiment. In this embodiment, the temperature sensor 9 is used as the first temperature detecting means for detecting the temperature of the heat exchange medium in the second heat exchange medium flow path 5 or passed through the second heat exchange medium flow path 5, and the first A temperature sensor 36 is used as second temperature detection means for detecting the temperature of the heat exchange medium that passes through the heat exchange medium flow path 3 and is conveyed to the second heat exchange medium flow path 5. In this embodiment, the temperature sensor 9 is provided at one end 6 a of the connection flow path 6, and the temperature sensor 36 is provided at the flow path 72 of the third heat exchange medium flow path 7.

  In FIG. 9, reference numeral 70 indicates control means for controlling the drive of the medium pressure pump 8. The control means 70 is constituted by a known computer, like the above-described control means. Temperature sensors 9 and 36 and the main switch 21 are connected to the input side of the control means 70, and the medium pressure pump 8 is connected to the output side. In the ROM of the control means 70, a predetermined temperature difference Δt that is a parameter for turning off the drive of the medium pressure pump 8 is set in advance.

  When the main switch 21 is operated, the control means 70 drives the medium pressure pump 8 and calculates the temperature difference Δt1 between the temperature sensor 9 and the temperature sensor 36. Based on this calculated temperature difference Δt1, the medium pressure is supplied. The drive of the pump 8 is turned off.

  The operation of the load heating having such a configuration will be described with reference to the flowchart shown in FIG. This system functions when the main switch 21 is turned on in step F1 of FIG. 10, and proceeds to step F2 to turn on the driving of the medium pressure pump 8. When the medium pressure pump 8 is turned on, the brine water in each flow path starts circulating in the pipe. When brine water flows into the first heat exchange medium flow path 3 from the one end 3b of the first heat exchange medium flow path 3, the surface heat and underground heat of the sunshine 2 heated by sunlight are absorbed. The second heat exchange medium flow path 5 is transported from the other end 3a of the heat exchange medium flow path 3 to the other end 5a of the second heat exchange medium flow path 5 through the third heat exchange medium flow path 7. Introduced in. The introduced brine water moves in the second heat exchange medium flow path 5 toward the one end 5b. During this movement, the heat of the brine water is transmitted to the surface of the shaded area 4 to warm the shaded area 4. The brine water that has moved in the second heat exchange medium flow path 5 escapes from the one end 5b in the second heat exchange medium flow path 5 and returns to the first heat exchange medium flow path 3 through the connection flow path 6. Is returned.

  After the medium pressure pump 8 is turned on, the control means 70 proceeds to step F3, takes temperature information t4, t5 from the temperature sensors 9, 36, calculates the temperature difference Δt1, and proceeds to step F4. In step F4, the calculated temperature difference Δt1 is compared with the predetermined temperature difference Δt to determine whether or not the calculated temperature difference Δt1 is equal to or less than the predetermined temperature difference Δt. If the calculated temperature difference Δt1 is equal to or less than the predetermined temperature difference Δt, the shaded ground 4 is warmed by the heat of the brine water and the temperature difference of the brine water disappears, and the process proceeds to step F4. The drive is turned off and this control is finished. Until the calculated temperature difference Δt1 becomes equal to or smaller than the predetermined temperature difference Δt, the medium pressure pump 8 is kept on.

  As described above, even if the on / off control of the medium pressure pump 8 is performed, the warm brine water can be supplied from the first heat exchange medium flow path 3 to the second heat exchange medium flow path 5 only when necessary. It is possible to efficiently circulate brine water, reduce unnecessary pump drive, reduce energy consumption in the road heating system, and reduce running costs while reducing environmental load. it can.

  As in the present embodiment, the temperature information t4, t5 is taken from the temperature sensors 9, 36 to calculate the temperature difference Δt1, and based on the comparison result between the calculated temperature difference Δt1 and the predetermined temperature difference Δt, the second and third The embodiment may be executed. Further, the driving mode of the medium pressure supply motor 8 is not based on the operation of the main switch 21, but a known timer may be connected to each control means so as to perform on / off control by the timer.

  In each embodiment, although the 1st heat exchange medium flow path 3 was set as the form embed | buried under the sunlight place 2, you may install in the roof 17 and wall of the building 16, for example. In order to install the first heat exchange medium flow path in such a place, a known heat collector in which a flow path is formed in the casing may be used.

  In each embodiment, in consideration of various terrain and building conditions, the area of the sunshine 2 is made smaller than the area of the shaded portion 4, and the total length of the first heat exchange medium flow path 3 is changed to the second heat exchange. It was made shorter than the full length of the medium flow path 5. However, when the area of the sunshine 2 can cover the area of the shaded part 4, the overall length of the first heat exchange medium flow path 3 can be increased to increase the heat collection efficiency. Thus, in the third embodiment, it is estimated that the use loss degree of the gas water heater 54 can be extremely reduced.

  1 is a perspective view showing an overall configuration of a road heating system showing a first embodiment of the present invention.   It is a top view of the road heating system shown in FIG.   It is a flowchart which shows the control operation of 1st Embodiment.   It is a perspective view which shows the whole structure of the road heating system which shows the 2nd Embodiment of this invention.   It is a flowchart which shows the control action of 2nd Embodiment.   It is a perspective view which shows the whole structure of the road heating system which shows the 3rd Embodiment of this invention.   It is a block diagram of the control means in the 3rd Embodiment, and the component connected to it.   It is a flowchart which shows the control action of 3rd Embodiment.   It is a block diagram of the control means in the 3rd Embodiment, and the component connected to it.   It is a flowchart which shows the control operation of 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Road heating system 2 Area | region 3 irradiated with sunlight 3rd 1st heat exchange medium flow path 3a The other end 3b of the 1st heat exchange medium flow path 4 One end of the 1st heat exchange medium flow path 4 Sunlight irradiation Region 5 not to be processed Second heat exchange medium flow path 5a Second heat exchange medium flow path other end 5b Second heat exchange medium flow path one end 7 Third heat exchange medium flow path 8 Medium pressure pump 9 1 temperature detection means 20 control means 30 underground heat collection part 35 electromagnetic on-off valve 36 second temperature detection means 37 heat collection temperature detection means 50 auxiliary heat source supply means 51 storage parts 52, 53 channel 54 heater 55 for auxiliary heat source Drive pump 73 Bypass flow path t Predetermined temperature t1 Detection temperature t2 Detection temperature t3 Detection temperature

Claims (6)

A first heat exchange medium flow path disposed in a region irradiated with sunlight;
A second heat exchange medium flow path embedded in the ground of a region not irradiated with sunlight, one end of which is connected to one end of the first heat exchange medium flow path,
A third heat exchange medium flow path connecting the other end of the first heat exchange medium flow path and the other end of the second heat exchange medium flow path;
A medium that is disposed in the third heat exchange medium flow path and circulates the heat exchange medium from the first heat exchange medium flow path to the second heat exchange medium flow path via the third heat exchange medium flow path. A load heating system comprising a pressure pump. The road heating system according to claim 1, wherein
Detecting the surface temperature of the area not irradiated with sunlight, the temperature of the heat exchange medium passing through the second heat exchange medium flow path, or the temperature of the heat exchange medium passing through the second heat exchange medium flow path First temperature detecting means for
Control means for controlling the drive of the medium pressure pump,
The load heating system, wherein the control means drives the medium pressure pump when the temperature detected by the first temperature detection means reaches a predetermined temperature set in advance. The road heating system according to claim 1 or 2,
A road heating system comprising an underground heat collecting section in the middle of the third heat exchange medium flow path. The road heating system according to claim 3,
A bypass flow path connecting a third heat exchange medium flow path located upstream and downstream of the underground heat collection unit;
An electromagnetic on-off valve provided in the bypass flow path;
The temperature of the region irradiated with sunlight, the temperature of the heat exchange medium passing through the first heat exchange medium flow path, or the temperature of the heat exchange medium passing through the first heat exchange medium flow path is detected. Second temperature detecting means;
The heat collection temperature for detecting the temperature in the underground heat collection unit, the temperature of the heat exchange medium passing through the underground heat collection unit, or the temperature of the heat exchange medium passing through the underground heat collection unit Detecting means,
Connecting the underground heat collection section to the bypass flow path at a position downstream of the electromagnetic on-off valve in the medium conveyance direction,
The control means compares the detection temperature from the second temperature detection means with the detection temperature from the heat collection temperature detection means, and the detection temperature from the heat collection temperature detection means is the detection temperature from the second temperature detection means. If the detected temperature from the heat collection temperature detecting means is lower than the detected temperature from the second temperature detecting means, the electromagnetic on / off valve is controlled to close. A road heating system characterized by The road heating system according to any one of claims 1 to 4,
A storage section that is provided in connection with the third heat exchange medium flow path and stores a part of the circulating heat exchange medium;
A load heating system comprising: an auxiliary heat source supply unit that heats the heat exchange medium stored in the storage unit and returns the heated heat exchange medium to the storage unit. The road heating system according to claim 5,
The auxiliary heat source supply means includes a heater connected to the reservoir through a flow path, and an auxiliary heat source drive pump that is provided in the flow path and feeds a heat exchange medium in the reservoir to the heater. And
The control means drives the auxiliary heat source drive pump when at least the medium pressure pump is in a driving state and the detected temperature from the first temperature detecting means is less than a predetermined temperature set in advance. Load heating system.

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