JP5550850B2 - Heat utilization system and heat utilization method - Google Patents

Description

  The present invention relates to a heat utilization system and a heat utilization method that can effectively use solar heat and geothermal heat. For example, heat utilization that can efficiently use solar heat and geothermal heat even in general houses in cold regions. The present invention relates to a system and a heat utilization method.

  As a conventional heat utilization system, the most common one is to use water stored in a water supply tank by a solar water heater as water for daily use.

  Moreover, as an evolution type, the heating medium heated by the solar heat collecting panel is used to warm water in the water tank, and a heat pump is provided to further heat the water in the water tank by the heat pump. It was.

  Furthermore, using the fact that the temperature in the ground is constant, the thermal medium is circulated between the ground and the heat pump, and geothermal is used to increase the efficiency of the heat pump. The system has also been realized.

  For example, the solar energy utilization apparatus described in Patent Document 1 includes a hot water storage tank for storing hot water used for daily life, a heat collection unit embedded in the ground, a solar heat collection panel, a heat pump, and a heat collection unit. A circulation path for circulating the first heat medium between the solar heat collecting panel and the heat pump, a first heating coil for flowing a second heat medium heated by the heat pump disposed in the hot water tank, and a refrigerant path The heat pump is configured to absorb heat from the first heat medium flowing through the refrigerant path to heat the second heat medium, and to transfer the first heat medium to the second heat coil. While circulating through the heating coil, the second heating medium was circulated through the first heating coil so as to heat the water in the hot water tank.

  The circulation path includes a first state in which the first heat medium flows through the heat collector and the second heating coil without going through the heat collecting unit, and heat collection without going through the second heating coil. Switching between a second state in which the heat medium flows through the heat collecting unit and the heat collecting unit and a third state in which the first heat medium flows through the heat collecting unit without passing through the heat collector and the second heating coil A flexible channel switching means was provided.

  When the water temperature in the hot water tank is lower than the set temperature and the temperature of the heat medium heated by the solar heat collecting panel is higher than the water temperature in the hot water tank by a predetermined temperature or more, the heat pump is not operated and the flow path The switching means switches the first heat medium to flow through the heat collector and the second heating coil without passing through the heat collecting section.

  The water temperature in the hot water tank is lower than the set temperature, the temperature of the heat medium heated by the solar heat collecting panel is lower than the predetermined temperature than the water temperature in the hot water tank, and the heat heated in the heat collecting section When the temperature is higher than the temperature of the medium by a predetermined temperature or more, the heat pump is operated and the flow path switching means is switched so that the heat medium flows through the heat collector and the heat collecting unit without passing through the second heating coil. It was.

  Also, if the water temperature in the hot water tank is lower than the set temperature and the temperature of the heat medium heated by the solar heat collecting panel is lower than the temperature of the heat medium heated by the heat collecting section, the heat pump is activated. In addition, the flow path switching means switches so that the heat medium flows through the heat collecting part without passing through the heat collector and the second heating coil, the water temperature in the hot water tank is equal to or higher than the set temperature, and the solar heat collecting When the temperature of the heating medium heated by the panel is higher than the temperature of the heating medium heated by the heat collecting unit by a predetermined temperature or more, the second heating coil is installed by the flow path switching means without operating the heat pump. The heat medium was allowed to flow between the heat collector and the heat collecting part without going through.

Japanese Patent Laid-Open No. 2005-214591

  However, since the hot water heated by the solar heat collection panel is used, or the water heated by the solar heat collection panel is only used for heating the water in the water tank, in the summer when sunlight is sufficiently poured, The heated heat medium could only be used for a very small part of the day, and the heated heat medium could hardly be used.

The same applies to the heat utilization system described in Technical Document 1. The hot water storage tank is only for hot water supply, and is not used unless the temperature of the heat medium heated by the solar heat collection panel is higher than 55 ° C. There wasn't.
In addition, the air conditioning is all performed by the operation of heat pumps, circulation pumps, radiating fans, and radiators.

  This invention was made | formed by the subject mentioned above, and aims at providing the heat | fever utilization system which can utilize sunlight and geothermal heat effectively without waste.

In order to achieve the above object, for example, the following configuration is provided.
That is, a high-temperature water storage tank that stores hot water having a high temperature, a medium-temperature water storage tank that stores hot water having a temperature lower than that of the high-temperature water storage tank, and each water tank that can heat the hot water stored in the storage tank A heat exchange unit, a solar heat collection panel, a heat storage unit with a main part embedded in the ground, and a heat exchange medium selected from the solar heat collection panel, the heat storage unit, and the heat exchange unit A medium circulation path for circulation, a panel control valve for controlling whether or not to circulate the heat exchange medium circulating in the medium circulation path to the solar heat collecting panel, and the heat exchange circulating in the medium circulation path A unit control valve for controlling whether or not a medium is circulated to each of the heat exchange units, and an underground control valve for controlling whether or not the heat exchange medium circulated through the medium circulation path is circulated to the heat storage unit When And a control unit for controlling the respective control valves, the control unit and controls the control valves based on the temperature of the heat exchange medium.

  And for example, it further includes a panel temperature sensor that detects the temperature of the liquid heat medium in the solar heat collecting panel, and the control unit is configured to transfer the heat exchange medium from the temperature detected by the panel temperature sensor. It is characterized by determining whether to circulate or not.

  Further, for example, the heat exchange unit can heat the hot water sent from the water storage tank with heat from the heat exchange medium, and the control unit has a measurement temperature of the panel temperature measurement unit equal to or higher than a predetermined temperature. In addition, the heat exchange medium is controlled to circulate through the solar heat collecting panel and the heat exchange medium circulation path, and the heat exchange medium temperature which is a basis of the circulation path control is examined.

  Further, for example, when the heat exchange medium in the medium circulation path is higher in temperature than the temperature of the hot water stored in the high-temperature water reservoir, the control unit converts the heat exchange medium into the solar heat collection panel and the high-temperature water. The heat exchange medium corresponding to the water storage tank is controlled to circulate, and the heat exchange medium in the heat exchange medium circulation path is stored in the intermediate temperature water storage tank at a temperature equal to or lower than the temperature of the hot water stored in the high temperature water storage tank. If the temperature is higher than the temperature of the heated water, the heat exchange medium is controlled to circulate between the solar heat collection panel and the heat exchange unit corresponding to the intermediate temperature water storage tank, When the heat exchange medium is equal to or lower than the temperature of the hot water stored in the intermediate temperature water storage tank and equal to or higher than the temperature of the heat exchange medium stored in the heat storage section, the heat exchange medium is Circulate the heat storage section And controlling the respective control valves as.

  For example, when the heat exchange medium in the heat exchange medium circulation path is equal to or lower than the temperature of the heat exchange medium stored in the heat storage part, the control unit may cause the solar heat collection panel to include the heat exchange medium. The panel control valve is controlled so as not to be supplied.

  Further, for example, the high-temperature water storage tank that stores hot water having a high temperature is a hot water supply tank, and the hot water storage tank that stores hot water having a temperature lower than that of the high-temperature water storage tank is a heat storage tank for air conditioning. It is characterized by.

  Further, for example, a heat pump is connected to the intermediate temperature water storage tank, and the heat pump can heat the intermediate temperature water stored in the intermediate temperature water storage tank.

  For example, the heat pump is also connected to the medium circulation path, can absorb the heat of the heat exchange medium, and can heat the high-temperature water stored in the high-temperature water reservoir. .

  Further, for example, the heat pump is connected to the heat storage unit, and is capable of circulating the heat exchange medium to the heat storage unit and the heat pump when the heat pump is operating.

  For example, the control unit circulates a heat exchange medium through the medium circulation path, the solar heat collection panel, and the heat storage unit during cooling operation by the heat pump, and heats the heat exchange medium heated by the heat pump. It is possible to dissipate heat through the solar heat collecting panel.

  Further, for example, the heat storage section is formed by joining together a necessary number of plastic pipes having a substantially U-shape, the main part of which is buried in the ground, and filled with sand around the underground section of the plastic pipe. It is characterized by becoming.

  For example, the heat exchange medium has a specific heat larger than that of water, and can maintain a liquid phase state regardless of the surrounding environment. For example, the heat exchange medium is an antifreeze liquid.

  Or, a solar heat collection panel, a water storage tank for storing hot water, a heat exchange unit capable of heating the hot water stored in the water storage tank, a heat storage unit having a main part embedded in the ground, and the solar heat collection A heat exchange medium capable of selectively circulating the panel, the heat storage unit, and the heat exchange unit, and a heat exchange medium for selectively circulating the heat exchange medium between the solar heat collection panel, the heat storage unit, and the heat exchange unit. A heat utilization method in a heat utilization system that uses hot water stored in the water storage tank with a circulation path, wherein the heat exchange medium is circulated through the solar heat collection panel and the heat exchange medium circulation path. And when the heat exchange medium in the heat exchange medium circulation path has a temperature higher than the hot water stored in the water storage tank, the heat exchange medium is passed through the heat exchange medium circulation path to the solar heat collection panel. And two types of heating modes for circulating the heat exchange unit and the heat exchange medium when the heat exchange medium in the heat exchange medium circulation path is at a temperature lower than the hot water stored in the water storage tank. An underground heat storage mode for circulating the solar heat collecting panel and the heat storage section through a medium circulation path, wherein the heat exchange medium in the heat exchange medium circulation path is lower than the heat exchange medium in the heat storage section It is a heat utilization method that shifts to the preparation mode when the temperature is high.

  And, for example, the water tank includes two water tanks, a high temperature water water tank that stores hot water having a high temperature and a hot water water tank that stores hot water having a temperature lower than that of the high temperature water water tank, and the hot water heating mode. When the heat exchange medium in the heat exchange medium circulation path is at a temperature higher than the hot water stored in the high temperature water storage tank, the heat exchange medium is connected to the solar heat collection panel via the heat exchange medium circulation path. A high temperature water heating mode for circulating the heat exchange unit of the high temperature water storage tank, and the heat exchange medium in the heat exchange medium circulation path is stored in the hot water storage tank lower than the hot water stored in the high temperature water storage tank. A medium warm water heating mode in which the heat exchange medium is circulated between the solar heat collection panel and the heat exchange unit of the warm water storage tank via the heat exchange medium circulation path when the temperature is higher than the warm water being used. It is a heat utilization method.

  Further, for example, the heat utilization system further includes a heat pump capable of heating hot water stored in the water storage tank, and the hot water stored in the water storage tank is equal to or lower than a predetermined temperature regardless of heating in the heat exchange unit. The heat utilization method has a water tank heating mode in which hot water stored in the water tank is heated to a predetermined temperature by the heat pump.

  Further, for example, the heat pump can supply the heat exchange medium circulating in the heat storage unit, and is a heat utilization method in which the hot water is heated after being preheated with the heat exchange medium. .

  Further, for example, during cooling operation by the heat pump, a heat exchange medium is circulated through the medium circulation path, the solar heat collection panel, and the heat storage unit, and heat of the heat exchange medium heated by the heat pump is transmitted to the solar heat collection panel. It is the heat utilization method which dissipates heat through, It is characterized by the above-mentioned.

  As described above, the heat utilization system of the present invention can efficiently use the heat energy collected by the solar heat collection panel without waste, and can also reduce the power consumption required for air conditioning. Can provide.

1 is a schematic route diagram of a solar heat and underground heat utilization system according to an embodiment of the present invention. It is a figure for demonstrating the schematic operation | movement of the operation | movement at the time of the air_conditioning | cooling mode setting of the example of this Embodiment mainly.

It is a figure for demonstrating the schematic operation | movement of the operation | movement at the time of the heating mode setting mainly of the example of this Embodiment. It is a flowchart for demonstrating the detail of the preparation mode in FIG.

It is a flowchart for demonstrating the detail of the hot water supply thermal storage mode in FIG. It is a flowchart for demonstrating the detail of the air-conditioning thermal storage mode in FIG.

It is a flowchart for demonstrating the detail of the underground heat storage mode in FIG. 4 is a flowchart for explaining details of a stop mode in FIGS.

It is a flowchart for demonstrating the detail of the underground heat radiation mode in FIG.

10 ... Solar heat collecting panel,
15, 25, 35, 45, 65 ... temperature sensor,
20 ... hot water tank,
23, 48, 49 ... check valve 33, 44, 47 ... two-way valve,

26, 36, 46 ... pumps,
28, 38 ... heat exchange unit,
30 ... thermal storage tank,
32 ... heating device,
40. Heat medium circuit,

42, 43, ... three-way valve,
50 ... heat pump,
60 ... thermal storage part,
100: Control unit

In order to implement the present invention, the embodiment includes, for example, the following schematic configuration.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an invention according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram for explaining an outline of a heat utilization system according to an embodiment of the present invention.

  In FIG. 1, reference numeral 10 denotes a solar heat collection panel, and a pipe for collecting solar heat by circulating a heat exchange medium (not shown) is circulated inside the solar heat collection panel. A heat exchange medium circulation path 40 is connected to both ends of the pipe via a panel control three-way valve 41.

  The solar heat collecting panel 10 is desirably placed, for example, on the roof surface of the building in the solar direction. However, it is not limited to the above example, it may be set on the veranda of the building, attached to the wall part, or installed on the ground so that it can receive sunlight effectively. If it is installed, the installation location is not limited at all.

  Further, the solar heat collecting panel 10 is not limited to the fixed installation example, and the solar heat collecting panel 10 has a large difference in the heat collecting effect depending on the direction with respect to the sun. And the solar heat collection efficiency can be improved by changing the panel tilt angle between the winter when the sun passes through the low sky.

  The panel angle and direction may be automatically controlled so that the panel always faces the sun in response to the movement of the sun. This control checks the latitude and longitude from the place where the system is installed, calculates the sun position throughout the year in advance, stores it in the memory, and stores the sun position sequentially as the date passes It may be possible to control the inclination and orientation of the solar thermal collector panel according to the position of the sun that has been read.

  Note that, in the case of bad weather where almost no heat collection effect due to sunlight can be expected, useless energy consumption may be suppressed by keeping it fixed at a standard position. In this way, by performing finer panel control, heat collection by sunlight can be efficiently performed.

  A heat collector temperature sensor 15 for measuring the internal temperature of the solar heat collection panel 10 disposed at the upper portion of the solar heat collection panel 10 measures whether the heat collection internal temperature can be connected to each circulation path. Judging.

  For example, the panel control two-way valve 33, the hot water supply control three-way valve 42, etc. at the time of starting the system or in the heating operation mode in which the temperature of the solar heat collecting panel 10 is expected to be lower than the temperature of the heat storage section temperature sensor 65 described later. The heat storage control three-way valve 43, the circulation control two-way valve 44, and the underground circulation check valve 48 are controlled to circulate the heat exchange medium.

  20 is a hot water tank which is a high temperature water storage tank for storing high temperature water of relatively high temperature, for example, about 50 ° C., 23 is a check valve for preventing the hot water in the hot water tank 20 from flowing back to the heat pump 50, and 25 is hot water supply. A hot water tank temperature sensor that measures the temperature of the hot water stored in the tank 20, 26 is a hot water tank pump that circulates the hot water in the hot water tank 20 to the hot water tank heat exchange unit 28, and 28 heats the hot water in the hot water tank 20. It is a hot water tank heat exchange unit.

  30 is a heat storage tank that is a medium temperature water storage tank that stores medium temperature water that can be used for cooling and heating, for example, about 35 ° C., and 33 is whether or not the warm water in the heat storage tank is sent to the heat storage tank heat exchange unit 38. 2 is a bypass control two-way valve that controls the temperature, 35 is a heat storage tank temperature sensor that measures the temperature of hot water stored in the heat storage tank 30, 36 is a heating pump that sends draft water in the heat storage tank 30 to the heater 32, and 38 is It is a heat storage tank heat exchange unit that heats the hot water in the heat storage tank 30.

  Reference numeral 40 denotes a heat exchange medium circulation path that can be formed by a pipe having a certain degree of heat resistance, such as a copper pipe or an aluminum pipe subjected to heat insulation treatment of a predetermined diameter, and 42 denotes heat exchange with the heat exchange unit 28. A hot water supply control three-way valve for controlling whether or not the medium is circulated, 43 is a heat storage control three-way valve for controlling whether or not the heat exchange medium is circulated in the heat exchange unit 38, and 44 is the solar heat collecting panel 10 in the heat storage unit 60. A circulation control two-way valve 47 for controlling whether or not to circulate the heat exchange medium from the heat exchange medium 47 circulates the heat exchange medium in the heat exchange medium circulation path 40 to the heat storage section 60 whose main part is buried in the ground An underground control two-way valve 48 that controls whether or not the heat exchange medium in the heat storage unit 60 is circulated only by the heat storage unit 60 and the heat pump 50 or the heat exchange medium circulation path 40 is circulated. Middle circulation check valve, 49 A ground control check valve for controlling whether or not to circulate the heat storage section 60 to the heat exchange medium exchange medium circulation path 40.

  50A to C schematically represent the heat pump 50, and includes at least three heat exchange units in which hot water in the hot water tank 20, hot water in the heat storage tank 30, and a heat exchange medium from the heat storage unit 60 are circulated separately.

  Reference numeral 60 denotes a heat storage section formed by molding a plastic pipe (for example, a vinyl chloride pipe) having a slight flexibility into a substantially U shape, and embedding a main portion in the substantially vertical direction, 65 Is a heat storage unit temperature sensor capable of measuring the heat exchange medium temperature in the heat storage unit 60.

  In this embodiment, a substantially U-shaped pipe is disposed in a vertical hole formed in the ground, and dredged sand is filled in the vertical hole. The main part may be embedded in the horizontal direction instead of the vertical direction. Further, it may be embedded at a predetermined angle.

  The filling of dredged sand between the substantially U-shaped pipe and the surrounding ground is almost the same as the case where the substantially U-shaped pipe is buried in the ground and filled with the same soil as the surrounding area. This is because it has been found that the heat transfer efficiency between the heat exchange medium and the surrounding ground is greatly improved.

  This is because, by filling the sand around the substantially U-shaped pipe in this manner, it is possible to easily generate a state in which the pipes are in close contact with each other without causing a gap or the like around the pipe. It should be noted that filling around the substantially U-shaped pipe is not limited to dredged sand, but can be substituted with a small particle diameter or bentonite.

The pipe embedding depth of the heat storage section 60 is adjusted according to the capacity of the heat pump and the ground and water level of the embedding place. For example, in the example shown in the figure, the pipe is buried approximately 60 m to 80 m in depth and slightly flexible. Has two U-shaped pipes. This burying method is not limited to the example shown in the figure. For example, even if four to six U-shaped pipes with a depth of about 30 m are provided side by side, or a U-shaped with a depth of about 20 m. As many as eight pipes may be provided.
Furthermore, instead of burying deeply in the ground, a large number of them may be buried horizontally and relatively close to the ground surface.

  Reference numeral 100 denotes a controller that measures the temperature of each of the above temperature sensors and controls each component according to the measured temperature and an operation mode (described later) set by an operation mode setting unit (not shown). In addition to controlling the heat pump and the opening and closing of all valves, efficient heat utilization is realized.

  In the control unit 100, 110 is an operation control unit that controls driving of each component, 120 is an operation instruction panel for setting each operation sequence and setting an operation mode, and 130 is set or initialized by the operation instruction panel. The operation parameter storage unit 140 stores each operation parameter, and an operation sequence storage unit 140 stores an operation sequence such as an operation sequence instructed from the operation instruction panel 120 or a standard operation sequence initialized.

  The operation control unit 110 controls the operation of each component according to the operation sequence stored in the operation sequence storage unit 140 and the operation parameter stored in the operation parameter storage unit 130.

  The warm water in the hot water tank 20 is sent to the kitchen, washroom, bathroom, etc., and the warm water in the heat storage tank 30 is sent to the radiator in the living room and used as heating. . About a heat radiator, since the thing of a general structure can be used, detailed description is abbreviate | omitted.

  The operation of the heat utilization system according to the present embodiment having the above configuration will be described below with reference to the flowcharts shown in FIGS. 2 to 8 are flowcharts for explaining the operation of the heat utilization system of the present embodiment. FIG. 2 is a diagram for explaining the schematic operation of the operation mainly when the cooling mode is set. FIG. These are the figures for demonstrating the outline operation | movement of the operation | movement at the time of heating mode setting mainly.

  4 is a flowchart for explaining details of the preparation mode in FIGS. 2 and 3, FIG. 5 is a flowchart for explaining details of the hot water supply mode in FIGS. 2 and 3, and FIG. 6 is details of the heat storage mode in FIG. 7 is a flowchart for explaining details of the underground heat storage mode in FIG. 3, FIG. 8 is a flowchart for explaining details of the stop mode in FIGS. 2 and 3, and FIG. 9 is FIG. It is a flowchart for demonstrating the detail of the underground heat radiation mode in.

  In the following description, heat utilization using the solar heat collecting panel 10 will be mainly described, and detailed description of the hot water heating control in the hot water tank 20 and the heat storage tank 30 by the heat pump 50 will be omitted. Since the usage method of the heat pump 50 is a general usage method, a detailed description is omitted, but when the temperature of the hot water tank 20 or the heat storage tank 30 is equal to or lower than a preset temperature, the set temperature is reached. It is used for heating or supplying cold water to a cooling device (not shown) during cooling operation.

  The operation of the system according to the present embodiment can be instructed from the operation instruction panel 120, and various sequences described below can be stored in the operation sequence storage unit 140 by initial setting or the like. That is, an arbitrary operation can be performed according to the setting.

  Then, the operation shown in the flowchart is performed according to the operation sequence stored in the operation sequence storage unit 140. In addition, the operation instruction panel 120 can instruct whether to operate the system in the cooling mode in summer, intermediate period, etc. or in the heating mode in winter, etc., and set the temperature setting to shift to each operation mode. Easy to do.

  First, a schematic operation sequence of the heat utilization system of the present embodiment will be described with reference to FIGS. 2 and 3. The following control is performed by the operation control unit 110 according to the operation sequence registered in the operation sequence storage unit 140 and the instruction state of the operation instruction panel 120.

  In step S10, it is determined whether the operation mode setting of the operation instruction panel 120 is set to the heating mode or the cooling mode (including the intermediate mode). When the cooling mode is set, the process proceeds to step S12, and the temperature of the upper part of the solar heat collecting panel 10 is measured by the temperature sensor 15.

  In a succeeding step S14, it is checked whether or not the measured temperature is a temperature at which the circulating path 40 can be circulated. The temperature that can be circulated can be set to an arbitrary temperature. For example, it is desirable that the temperature be 40 ° C. or higher during the day and 12 ° C. or lower during the night. Furthermore, 45 ° C. or higher is sometimes preferable during the daytime. More preferably, it is 60 degreeC or more. If it is not this temperature, the process returns to step S12 and the heat exchange medium is not circulated.

  On the other hand, if the temperature can be circulated, the process proceeds to step S16, and the preparation mode operation shown in FIG. 4 is performed. In step S18, the temperature of the heat exchange medium in the circulation path is measured by the circulation temperature sensor 45. In a succeeding step S20, it is checked whether or not the hot water in the hot water tank 20 is higher than a high temperature set temperature at which the hot water can be heated.

  For example, when the circulation path temperature sensor 45 is 40 ° C. or higher, preferably 60 ° C. or higher, the process proceeds to step S22 and the hot water in the hot water tank 20 is heated. Then, it progresses to step S24 and it is investigated whether an operation mode is a change state.

  This is because, after continuing the operation in the hot water supply mode for a certain period of time, when the measured temperature of the circulating temperature sensor 45 is no longer equal to or higher than the high temperature set temperature determined in step S20, it is no longer suitable for operation in the hot water supply mode. The process proceeds to step S32.

  In step S40, it is checked whether or not the cooling operation is performed. If the cooling operation is not performed, the process returns to step S18. When the cooling operation is performed, the process proceeds to step S42, and the panel temperature sensor 15 checks the temperature of the heat exchange medium in the solar heat collection panel 10. In subsequent step S44, it is checked whether or not the temperature is within the heat radiation temperature range.

  For example, the case where the temperature of the heat exchange medium in the solar heat collection panel 10 is lower than the measurement temperature of the heat storage unit temperature sensor 65 is applicable. In the case of the heat radiation temperature range, the process proceeds to step S46, the heat radiation mode operation shown in detail in FIG. 9 is performed, and the process returns to step S18.

  On the other hand, if it is not higher than the high temperature set temperature in step S20, the process proceeds to step S26, and it is checked whether it is lower than the low temperature set temperature. As a low temperature setting temperature, the case of 12 degrees C or less etc. can be considered, for example. When the temperature is lower than the low temperature set temperature, the process proceeds to step S28, and the underground heat radiation mode operation shown in FIG. 7 is performed.

  Thereafter, the process proceeds to step S30 to check whether or not the operation mode is changed. This is because when the measured temperature of the circulating temperature sensor 45 is not lower than the low temperature set temperature determined in step S26 after the operation in the underground heat storage mode for a certain time, the operation in the underground heat dissipation mode is no longer performed. Since it is not suitable, the process proceeds to step S40.

  On the other hand, if it is not lower than the low temperature set temperature in step S26, the process proceeds to step S32 and the stop mode operation shown in FIG. 8 is performed. Thereafter, the process proceeds to step S34 to check whether or not the operation mode is changed. This is because, after the operation in the stop mode is continued for a certain period of time, when the measured temperature of the circulating temperature sensor 45 is no longer within the range of the stop mode, it is necessary to shift to another operation mode. Will proceed to.

  On the other hand, in step S10, when the operation mode setting on the operation instruction panel is the heating mode, the process proceeds to step S100 shown in FIG. 3 and shifts to the operation sequence in the heating mode.

  First, in step S102, the temperature of the upper part of the solar heat collecting panel 10 is measured by the panel temperature sensor 15 as in the cooling mode shown in FIG. Then, it is checked whether or not this temperature is a temperature at which the heat exchange medium can be circulated through the circulation path 40. If it is not this temperature, the process returns to step S102 and the heat exchange medium is not circulated.

  In the present embodiment, the circulation temperature to the circulation path is different between the heating mode and the cooling mode. In the heating mode, when the panel temperature sensor is 20 ° C. or higher, the operation is shifted to the circulation operation. This is because in the present embodiment, heating is performed using medium-temperature water stored in the heat storage tank 30.

  If the temperature at which the heat exchange medium can be circulated through the circulation path 40 is, for example, 20 ° C. or more, the process proceeds to step S106, and the preparation mode operation shown in FIG. Then, the heat exchange medium temperature in the circulation path is measured by the circulation temperature sensor 45, and it is checked in step S110 whether or not the temperature is higher than a high temperature set temperature at which the hot water in the hot water tank 20 can be heated.

  For example, when the circulation path temperature sensor 45 is 50 ° C. or higher, the process proceeds to step S112, and the hot water supply mode operation shown in FIG. 5 is performed in which there is no difference in basic operation from the cooling mode. In addition, although the above example is optimal for this temperature, it is not limited to the above example, It is good also as 40 degreeC or more similarly to the air_conditioning | cooling mode. If an arbitrary temperature setting within a range of 40 ° C. to 55 ° C. is performed, a desired effect can be obtained.

  Thereafter, the process proceeds to step S114 to check whether or not the operation mode is changed. This is because, after the operation in the hot water supply mode for a certain period of time, when the measured temperature of the circulating temperature sensor 45 is no longer equal to or higher than the high temperature set temperature determined in step S110, it is no longer suitable for operation in the hot water supply mode. The process returns to step S108.

  On the other hand, if it is not higher than the high temperature set temperature in step S110, the process proceeds to step S116 to check whether it is higher than the medium temperature set temperature. The medium temperature set temperature is not high enough to heat the hot water tank 20, but corresponds to a case where the temperature is sufficiently higher than the heating temperature of the heat storage tank 30 detected by the heat storage temperature sensor 35 or higher than the heating set temperature. To do.

  For example, when the temperature is lower than the high temperature set temperature and higher than the heat release mode set temperature described later, for example, 30 ° C. or higher (or 25 ° C. or higher), the process proceeds from step S116 to step S118, and the heat storage mode operation shown in FIG.

  Then, it progresses to step S120 and it is investigated whether an operation mode is a change state. This is because, after continuing the operation in the heat storage mode for a certain period of time, when the measured temperature of the circulating temperature sensor 45 is no longer equal to or higher than the intermediate temperature set temperature determined in step S116, it is no longer suitable for operation in the heat storage mode. The process returns to step S108.

  On the other hand, if the temperature is not equal to or higher than the medium temperature set temperature in step S116, the process proceeds to step S122 to check whether the temperature is equal to or higher than the low temperature set temperature. As a low temperature setting temperature, the case of 30 degreeC or more etc. can be considered, for example. In this case, the process proceeds to step S124, and the underground heat storage mode operation shown in FIG. 7 is performed.

  Thereafter, the process proceeds to step S126 to check whether or not the operation mode is changed. This is because, after continuing the operation in the heat dissipation mode for a certain period of time, when the measured temperature of the circulating temperature sensor 45 is not equal to or higher than the low temperature set temperature determined in step S122, it is no longer suitable for operation in the heat dissipation mode. The process returns to step S108.

  On the other hand, if it is not equal to or lower than the low temperature set temperature in step S122, the process proceeds to step S128, and the stop mode operation shown in FIG. 8 is performed. Then, it progresses to step S130 and it is investigated whether an operation mode is a change state. In this case, after the operation in the stop mode is continued for a certain period of time, if the measured temperature of the circulating temperature sensor 45 is no longer within the range of the stop mode, it is necessary to move to another operation mode, and step S102 Will return.

  In the above description, the transition temperature setting to the operation mode may be changed depending on the weather, such as in the case of cloudy and fine weather, rain, and snow, in addition to the distinction between winter and summer, daytime and nighttime. Further, the temperature of the heat exchange medium from the hot water tank 20, the heat storage tank 30, and the heat storage unit 60 is measured and compared with the temperature of the heat exchange medium circulating in the circulation path, and the measured temperature of the circulation path temperature sensor 45 is the temperature of the hot water tank 20. If the temperature is higher than the temperature of the hot water tank 20 but not higher than the temperature of the heat storage tank 30, the temperature is changed to the heat storage mode. If the temperature is higher than the temperature of the heat storage section 60, the temperature is changed to the underground heat storage mode. You may control to do.

  By controlling as described above, the hot water tank 20 is not so high as to be heated, but the heated heat exchange medium can be used effectively when heated to a heating set temperature or higher. It became. For this reason, even in the winter when the outside air temperature is low, by using the heat exchange medium heated by the solar heat collecting panel 10 effectively, consumption of energy necessary for heating using electric power or thermal power Can be greatly reduced.

  Next, details of each operation mode in the above description will be described. First, detailed control in the preparation mode will be described with reference to FIG.

  In the preparation mode, the heat exchange medium is circulated in the circulation path 40 and the solar heat collecting panel 10 for a certain period of time until the temperature is stabilized so that it can be determined which mode of operation should be shifted from now on. Measure. Therefore, in step S202, the hot water supply control three-way valve 42 and the heat storage control three-way valve 43 are controlled to the passing mode so that the heat exchange medium circulates through the solar heat collecting panel 10 and does not circulate through the heat exchange medium 28, 38, 60. Control.

  Subsequently, in step S204, the circulation control two-way valve 44 is controlled in the passing mode, and the underground control two-way valve 47 is controlled in the cutoff mode so that the heat exchange medium does not circulate through the heat storage unit 60.

  In step S206, the circulation pump 46 is driven, and the heat exchange medium is controlled to circulate only in the solar heat collection panel 10 and the circulation path 40. In the next step S208, it waits for a certain time to elapse. This is to wait for the state where the heat exchange medium is actually circulating through the circulation path 40 to be stabilized. The fixed time can be, for example, 30 seconds to several minutes, and preferably the state is stabilized by circulating for about 3 to 5 minutes.

  When the state is stabilized, the process proceeds to step S210, and the temperature of the heat exchange medium circulating in the circulation path is measured by the circulation temperature sensor 45. Then return.

  Next, detailed control in the hot water supply mode for heating the hot water stored in the hot water tank 20 will be described with reference to FIG. In the hot water supply mode, first, in step S302, the heat storage control 43 is controlled to the passing mode so that the heat exchange medium circulates through the solar heat collecting panel 10 and does not circulate through the heat exchange medium 38.

  Subsequently, in step S304, the circulation control two-way valve 44 is set to the passing mode, the heating control check valve 23, the underground control two-way valve 47, and the underground control check valve 49 are set to the cutoff mode, so that the heat exchange medium is supplied. While controlling so that it may not circulate through the thermal storage part 60, it controls so that the hot water currently stored by the hot water tank 20 may not circulate through the heat pump 50.

  In subsequent step S306, the hot water control three-way valve 42 is controlled to the hot water tank 20 side (heat exchange unit 28 side) so that the heat exchange medium in the circulation path 40 circulates through the hot water tank heat exchange unit 28. In step S308, the hot water tank pump 26 and the circulation pump 46 are driven, and the heat exchange medium is controlled to circulate through the solar heat collection panel 10, the circulation path 40, and the hot water tank heat exchange unit 28. The hot water stored is also controlled to circulate through the hot water tank heat exchange unit 28.

  Thereby, when the hot water stored in the hot water tank 20 passes through the hot water tank heat exchange unit 28, the heat from the heat exchange medium is absorbed. In step S310, the process waits for a predetermined time to elapse. This is because changing the operating mode too frequently will interfere with the operation of the heat exchange unit. For example, it is desirable to set the predetermined time from about 1 minute to about 10 minutes, more desirably from about 1 minute to 3 minutes, and optimally, for example, 3 minutes.

  Thereafter, in step S312, the temperature of the heat exchange medium circulating in the circulation path is measured by the circulation temperature sensor 45, and the process returns.

  Next, with reference to FIG. 6, the detailed control of the thermal storage mode which heats the warm water stored in the thermal storage tank 30 is demonstrated. In the heat storage mode, first, in step S402, the hot water supply control three-way valve 42 is controlled to the passing mode to control the heat exchange medium to circulate through the solar heat collection panel 10 and to prevent the heat exchange medium 28 from circulating through the hot water tank.

  Subsequently, in step S404, the circulation control two-way valve 44 is set to the passing mode, the exchange control two-way valve 33, the underground control two-way valve 47, and the underground control check valve 48 are controlled to the cutoff mode, so that the heat exchange medium is supplied. While controlling so that it may not circulate through the thermal storage part 60, it controls so that the warm water currently stored by the thermal storage tank 30 may circulate through the thermal storage tank heat exchange unit 38. FIG.

  In the subsequent step S406, the heat storage control three-way valve 43 is controlled to the heat storage tank 30 side (heat exchange unit 38 side) to control the heat exchange medium in the circulation path 40 to circulate through the heat storage tank heat exchange unit 38.

  Then, in step S408, the heat storage tank pump 36 and the circulation pump 46 are driven to circulate the heat exchange medium through the solar heat collection panel 10, the circulation path 40, and the heat storage tank heat exchange unit 38, and hot water stored in the heat storage tank 30. The heat storage tank heat exchange unit 38 is also circulated.

  Thereby, when the warm water stored in the heat storage tank 30 passes through the heat storage tank heat exchange unit 38, the heat from the heat exchange medium is absorbed. In step S410, the process waits for a predetermined time to elapse. This is because if the operation mode is changed too frequently, the operation of the heat storage tank heat exchange unit 38 is hindered. For example, it is desirable to set the predetermined time from about 1 minute to about 10 minutes, more preferably from about 1 minute to 3 minutes, and most preferably 3 minutes.

  Thereafter, in step S412, the temperature of the heat exchange medium circulating in the circulation path is measured by the circulation temperature sensor 45, and the process returns.

  Next, detailed control in the underground heat storage mode in which the heat exchange medium is circulated in the heat storage unit 60 to store heat in the ground will be described with reference to FIG. In the underground heat storage mode, first, in step S502, the hot water supply control three-way valve 42 and the heat storage control three-way valve 43 are controlled to the passing mode so that the heat exchange medium circulates through the solar heat collection panel 10 and does not circulate through the heat exchange mediums 28 and 38. To control.

  Subsequently, in step S504, the circulation control two-way valve 44 is controlled in the shut-off mode, and the underground control two-way valve 47 and the underground control check valve 49 are controlled in the passing mode. In the subsequent step S506, the underground circulation check valve 48 is controlled. Is controlled in the shut-off mode, and each valve is controlled so that the heat exchange medium can circulate through the solar heat collecting panel 10 and the heat storage unit 60.

  In step S508, the circulation pump 46 is driven, and the heat exchange medium is controlled to circulate through the solar heat collection panel 10, the circulation path 40, and the heat storage unit 60. Thereby, the heat energy of the heat exchange medium collected by the solar heat collecting panel 10 is radiated into the ground via the heat storage section 60, and the underground temperature is increased.

  This is because, for example, when the heat exchange medium is circulated between the heat storage unit 60 and the heat pump 50 at night, such as at night, when the temperature is lower than the underground temperature, the underground temperature gradually decreases. If heat is radiated from the heat storage unit 60 to the ground, a decrease in the underground temperature can be effectively prevented. In other words, unless the groundwater is flowing, the inventor continues to collect the ground without performing this heat storage, and a phenomenon occurs in which the underground temperature rapidly decreases after a certain point in time. In order to prevent this, the heat energy actively collected by the solar heat collector 10 is sent to the ground to store the heat.

  In step S510, the process waits for a predetermined time to elapse. This is because if the operation mode is changed too frequently, the efficiency of the system is deteriorated. Thereafter, in step S512, the temperature of the heat exchange medium circulating in the circulation path is measured by the circulation temperature sensor 45, and the process returns.

  Next, detailed control in the stop mode will be described with reference to FIG. In the stop mode, not only the supply of the heat exchange medium to the heat exchange unit or the heat storage unit 60 but also the circulation to the circulation path 40 is stopped and the temperature of the solar heat collecting panel 10 can be used. It is a mode that waits to become.

  For example, in the case of cloudy weather or nighttime, especially when the temperature of the heat exchange medium in the solar heat collection panel 10 becomes low, such as when snow accumulates on the solar heat collection panel 10 (such as below freezing point). Has a great effect of completely separating the heat exchange medium circulating in the solar heat collecting panel 10 from the hot water tank 20, the heat storage tank 30, the heat storage section 60, and the like.

  For this reason, first, in step S602 (solar heat collection panel circulation mode), the hot water supply control three-way valve 42 and the heat storage control three-way valve 43 are controlled to pass mode so that the solar heat collection panel 10 and the heat exchange medium are the heat exchange medium 28, 38 is controlled not to circulate.

  Subsequently, in step S604, the circulation control two-way valve 44 is controlled in the passing mode, the underground control two-way valve 47 and the underground control check valve 49 are controlled in the cutoff mode, and the heat storage section 60 and the circulation path 40 are disconnected. In subsequent step S606, the underground circulation check valve 48 is controlled to the shut-off mode, and control is performed so that the heat exchange medium does not circulate through the heat storage unit 60.

  In step S608, the circulation pump 46 is stopped, and control is performed so that the heat exchange medium does not circulate through the circulation path 40. In step S610, the process waits for a predetermined time to elapse. This is because if the operation mode is changed too frequently, the efficiency is lowered. Thereafter, in step S612, the panel temperature sensor 15 measures the temperature of the upper part of the solar heat collecting panel 10, and the process returns.

  Next, with reference to FIG. 9, the detailed control of the heat radiation mode in which the heat generated by the heat pump 50 during the cooling operation is radiated will be described. In the heat dissipation mode, first, in step S702, the hot water supply control three-way valve 42 and the heat storage control three-way valve 43 are controlled to the passing mode so that the heat exchange medium circulates through the solar heat collection panel 10 and does not circulate through the heat exchange media 28 and 38. Control.

  Subsequently, in step S704, the circulation control two-way valve 44 is controlled in the shut-off mode, and the underground control two-way valve 47 and the underground control check valve 49 are controlled in the passing mode. In the subsequent step S706, the underground circulation check valve 48 is controlled. Is controlled in the shut-off mode, and each valve is controlled so that the heat exchange medium can circulate through the heat pump 50, the solar heat collecting panel 10, and the heat storage section 60.

  In step S708, the circulation pump 46 is driven, and the heat exchange medium is controlled to circulate through the solar heat collection panel 10, the circulation path 40, the heat storage unit 60, and the heat pump 50. As a result, during the cooling operation, the heat exchange medium circulating on the heat radiation side of the heat pump 50 absorbs heat from the heat pump 50, and the heat exchange medium that has absorbed the heat is first sent to the solar heat collecting panel 10, and the heat energy is increased. The heat is radiated into the air, for example, through the piping of the solar heat collecting panel 10. Subsequently, the heat exchange medium is sent to the heat storage unit 60, and the heat energy is radiated into the ground to lower the heat exchange medium temperature.

  In the present embodiment, when all the heat from the heat pump 50 is dissipated into the ground during cooling operation, the underground temperature gradually rises and the cooling efficiency of the heat pump 50 is prevented from deteriorating. This heat dissipation mode is provided, and the heat exchange medium is also circulated through the solar heat collection panel during cooling, so that it is possible to prevent a rise in underground temperature. For example, it is effective when the air temperature is lower than the underground temperature, such as at night, and an increase in the underground temperature can be effectively prevented.

  Then, in subsequent step S710, it is checked whether or not the cooling operation is stopped (stopped). This is because if the cooling operation is stopped, the heat exchange medium is no longer heated by the heat pump 50. In this case, the process proceeds to step S714 to stop the circulation pump 46 and return.

  On the other hand, if the cooling operation is continued in step S710, the process proceeds to step S712, and whether or not it is the sunshine time, that is, the temperature in the solar heat collecting panel 10 is likely to be higher than the heat exchange medium temperature. Advances to step S714.

  The above configuration is summarized. A hot water tank 20 for storing hot water having a high temperature, a heat storage tank 30 for storing medium temperature water at a temperature lower than that of the hot water tank 20, and a hot water tank heat exchange unit 28 capable of heating the hot water stored in the hot water tank 20 The heat storage tank heat exchange unit 38 that can heat the hot water stored in the heat storage tank 30, the solar heat collection panel 10, the heat storage section 60 whose main part is buried in the ground, and the heat exchange medium as the solar heat collection panel 10, a medium circulation path 40 for selectively circulating the heat storage unit 60, and the heat exchange units 28, 38, and whether to circulate the heat exchange medium circulating in the medium circulation path 40 to the solar heat collection panel 10. A circulation control two-way valve 44, a hot water supply control three-way valve 42 for controlling whether or not the heat exchange medium circulating in the medium circulation path 40 is circulated to the respective hot water tank heat exchange unit 28 and the heat storage tank heat exchange unit 38, heat storage System 43, a circulation control two-way valve 44, an underground control two-way valve 47, an underground circulation check valve 48, which controls whether or not the heat exchange medium circulating in the medium circulation path 40 is circulated to the heat storage section 60, An intermediate control check valve 49 and a control unit 100 for controlling each control valve and the like are provided, and the heat exchange units 28 and 38 are hot water sent from the hot water tank 20 and the heat storage tank 30 by heat from the heat exchange medium. The control unit 100 controls each control valve based on the temperature of the heat exchange medium.

  Whether the heat exchange medium is circulated through the medium circulation path 40 is circulated when the measured temperature of the panel temperature sensor 15 for detecting the temperature of the heat exchange medium at the upper part of the solar heat collecting panel 10 is a predetermined temperature. The operation mode is determined from the temperature detected by the temperature sensor 45.

  The control unit 100 circulates the heat exchange medium between the solar heat collection panel 10 and the heat exchange unit 28 when the heat exchange medium in the medium circulation path 40 is higher than the temperature of the hot water stored in the hot water tank 20. When the heat exchange medium in the heat exchange medium circulation path 40 is at a temperature lower than the temperature of the hot water stored in the hot water tank 20 and higher than the temperature of the hot water stored in the heat storage tank 30, the heat exchange medium Is controlled so as to circulate between the solar heat collecting panel 10 and the heat exchange unit 38, and the heat exchange medium in the heat exchange medium circulation path is measured by the heat storage temperature sensor 65 below the temperature of the hot water stored in the heat storage tank 30. When the temperature is equal to or higher than the temperature of the heat exchange medium stored in the heat storage unit 60, each control valve is controlled so that the heat exchange medium is circulated through the solar heat collection panel 10 and the heat storage unit 60.

  A heat pump 50 is connected to the heat storage tank 30, and the heat pump 50 can heat medium-temperature water stored in the heat storage tank 30 and high-temperature water stored in the hot water tank 20 and is also connected to the medium circulation path 40. And configured to be able to absorb the heat of the heat exchange medium.

  The heat storage section 60 is formed by connecting a necessary number of plastic pipes having a substantially U-shaped flexibility, the main part of which is buried in the ground, and filling the sand around the underground section of the plastic pipe, Good heat conduction is achieved.

  As this heat exchange medium, it is desirable to use a medium having a large specific heat compared to water and capable of maintaining a liquid phase state regardless of the surrounding environment, and can be made inexpensive by using an antifreeze liquid as the heat exchange medium. .

  As described above, according to the present embodiment, for example, the heat exchange medium that is installed on the roof surface of a building and heated by the solar heat collection panel 10 by solar radiation and sent by the circulation pump 46 is supplied from the circulation path 40 to the hot water supply. The hot water stored in the hot water tank 20 can be heated by circulating the heat exchange unit 28 by switching the control three-way valve 42.

  Further, the heat exchange medium heated by the solar heat collecting panel 10 by solar radiation and sent by the circulation pump 46 is circulated through the heat exchange unit 38 by switching the three-way valve 43 from the circulation path 40, and the hot water stored in the heat storage tank 30 is supplied. Can be heated.

  Further, by switching the circulation control two-way valve 44, the underground control two-way valve 47, and the underground control check valve 49, the heat exchange medium warmed by the solar heat collecting panel 10 by solar radiation and sent by the circulation pump 46 stores heat. The part 60 circulates and the underground around the heat storage part 60 can be heated.

  In particular, the heat storage tank 30 is provided, and even when the heat exchange medium heated by the solar heat collecting panel 10 is heated to a degree slightly higher than the heating temperature, it can be used effectively and without waste. The outstanding effect that utilization of solar heat is implement | achieved can be show | played.

  In addition, when the heat exchange medium is simply circulated through a pipe buried in the ground and, for example, a heat pump, the temperature of the heat exchange medium collected from the ground gradually decreases due to a gradual decrease in the underground temperature. Can also be effectively prevented.

  In particular, the heat exchange medium circulating in the solar heat collecting panel 10 uses a liquid having a higher specific heat than ordinary water, and does not solidify even when used in a cold region, and vaporizes even in a warm region. Efficient heat exchange is realized by using a medium that does not occur.

  In addition, the heat storage section with solar heat collecting panels and underground piping sections and the heat exchange medium circulating in the circulation path are separated from the liquid stored in the storage tank and completely separated, so that the water storage in the storage tank Water that has been used does not circulate through unnecessary paths to cause a temperature drop or the like, and the structure can be simplified when heating by a plurality of types of heating mechanisms.

  In addition, air cooling that dissipates heat energy from the heat pump during the cooling operation from the solar heat collection panel via the heat effect medium can be realized, and heat can be dissipated to the ground via the U-shaped pipe and sand, Compared to the cooling of only one of them, various heat radiation efficiencies can be maintained over a long period of time.

Claims (13)

A high-temperature water storage tank for storing hot water at a high temperature;
A medium-temperature water storage tank for storing hot water having a temperature lower than that of the high-temperature water storage tank;
A heat exchange unit provided for each water tank that can heat the hot water stored in the water tank;
A solar heat collecting panel,
A heat storage part whose main part is buried underground,
A medium circulation path for selectively circulating the heat exchange medium through the solar heat collection panel, the heat storage unit, and the heat exchange unit;
A panel control valve for controlling whether or not to circulate the heat exchange medium circulating in the medium circulation path to the solar heat collecting panel;
A unit control valve for controlling whether or not to circulate the heat exchange medium circulating in the medium circulation path to the respective heat exchange units;
An underground control valve for controlling whether or not to circulate the heat exchange medium circulating in the medium circulation path to the heat storage unit;
A panel temperature sensor for detecting the temperature of the liquid heat medium in the solar heat collecting panel;
A control unit for controlling each control valve,
The heat exchange unit can heat the hot water sent from the water storage tank with heat from the heat exchange medium,
The control unit determines whether to circulate the heat exchange medium through the medium circulation path from the temperature detected by the panel temperature sensor, and when the measured temperature of the panel temperature measurement unit is equal to or higher than a predetermined temperature, The heat exchange medium is controlled to circulate through the solar heat collection panel and the heat exchange medium circulation path, and the temperature of the heat exchange medium that is a basis for the circulation path control is examined. When the temperature is higher than the temperature of the hot water stored in the high-temperature water reservoir, the heat exchange medium is controlled to circulate between the solar heat collection panel and the heat exchange unit corresponding to the high-temperature water reservoir, When the heat exchange medium in the heat exchange medium circulation path is lower than the temperature of the hot water stored in the high-temperature water reservoir and higher than the temperature of the hot water stored in the intermediate-temperature water reservoir, the heat exchange medium is solar Control is made to circulate between the heat collection panel and the heat exchange unit corresponding to the medium temperature water reservoir, and the heat exchange medium in the heat exchange medium circulation path is below the temperature of the warm water stored in the medium temperature water reservoir. When the temperature is equal to or higher than the temperature of the heat exchange medium stored in the heat storage unit, each control valve is controlled to circulate the heat exchange medium between the solar heat collecting panel and the heat storage unit. Usage system. The control unit prevents the heat exchange medium from being supplied to the solar heat collection panel when the heat exchange medium in the heat exchange medium circulation path is equal to or lower than the temperature of the heat exchange medium stored in the heat storage unit. 2. The heat utilization system according to claim 1, wherein the panel control valve is controlled. The high-temperature water storage tank for storing hot water having a high temperature is a hot water supply tank, and the hot water storage tank for storing hot water having a temperature lower than that of the high-temperature water storage tank is a heat storage tank for air conditioning. The heat utilization system according to claim 1 or 2. The heat utilization system according to claim 3, wherein a heat pump is connected to the intermediate temperature water reservoir, and the heat pump can heat the intermediate temperature water stored in the intermediate temperature water reservoir. 5. The heat pump is also connected to the medium circulation circuit, can absorb heat of a heat exchange medium, and can heat high-temperature water stored in the high-temperature water reservoir. The described heat utilization system. The heat utilization system according to claim 5, wherein the heat pump is connected to the heat storage unit, and is capable of circulating the heat exchange medium to the heat storage unit and the heat pump when the heat pump is in operation. The controller circulates a heat exchange medium through the medium circulation circuit, the solar heat collection panel, and the heat storage unit during cooling operation by the heat pump, and heat of the heat exchange medium heated by the heat pump is collected in the solar heat collection. The heat utilization system according to claim 6 , wherein heat can be dissipated through a thermal panel. The heat storage section is formed by joining together a necessary number of plastic pipes having a substantially U-shaped flexibility, the main part of which is buried in the ground, and filled with dredged sand around the underground section of the plastic pipe. The heat utilization system according to any one of claims 1 to 7, wherein 9. The antifreeze liquid according to claim 1, wherein the heat exchange medium is an antifreeze liquid having a specific heat larger than that of water and capable of maintaining a liquid phase state regardless of an ambient environment. Heat utilization system. A high-temperature water storage tank that stores hot water having a high temperature, a medium-temperature water storage tank that stores hot water having a temperature lower than that of the high-temperature water storage tank, and each water tank that can heat the hot water stored in the storage tank A heat exchange unit provided, a solar heat collection panel, a heat storage unit having a main part embedded in the ground, and a heat exchange medium selectively circulating through the solar heat collection panel, the heat storage unit, and the heat exchange unit For heat utilization in a heat utilization system that uses hot water stored in the two water storage tanks, and a medium temperature path for detecting the temperature of the liquid heat medium in the solar heat collecting panel. Because
It is determined whether to circulate the heat exchange medium through the medium circulation path from the temperature detected by the panel temperature sensor, and when the measured temperature of the panel temperature measurement unit is equal to or higher than a predetermined temperature, the heat exchange medium is The heat exchange medium is controlled to circulate through the solar heat collection panel and the heat exchange medium circulation path to check the heat exchange medium temperature as a basis for the circulation path control, and the heat exchange medium in the medium circulation path is transferred to the high-temperature water reservoir. A high-temperature water heating mode for controlling the heat exchange medium to circulate between the solar heat collection panel and the heat exchange unit corresponding to the high-temperature water reservoir when the temperature is higher than the temperature of the stored hot water;
When the heat exchange medium in the heat exchange medium circulation path is lower than the temperature of the hot water stored in the high temperature water reservoir and higher than the temperature of the hot water stored in the intermediate temperature water reservoir, the heat exchange medium A medium warm water heating mode for controlling the solar heat collection panel and the heat exchange unit corresponding to the medium warm water reservoir to circulate,
When the heat exchange medium in the heat exchange medium circulation path is equal to or lower than the temperature of the hot water stored in the intermediate temperature water storage tank and equal to or higher than the temperature of the heat exchange medium stored in the heat storage section, the heat exchange medium is The heat utilization method characterized by having the underground thermal storage mode controlled to circulate the said solar-heat collection panel and the said thermal storage part. The heat utilization system further includes a heat pump capable of heating warm water stored in the water tank,
A water storage tank that heats the hot water stored in the water storage tank to a predetermined temperature by the heat pump when the hot water stored in the water storage tank becomes a predetermined temperature or less despite heating in the heat exchange unit. The heat utilization method according to claim 10, further comprising a heating mode. The heat utilization method according to claim 11, wherein the heat pump can be supplied with the heat exchange medium circulating in the heat storage unit, and the hot water is heated after preheating with the heat exchange medium. . During cooling operation by the heat pump, the heat exchange medium is circulated through the medium circulation circuit, the solar heat collection panel, and the heat storage unit, and the heat of the heat exchange medium heated by the heat pump is passed through the solar heat collection panel. The heat utilization method according to claim 11 or 12, wherein heat is radiated.

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