JP5359195B2 - Solar system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar system of small power consumption of a commercial power source and low running cost while suppressing increase of cost for introducing a solar cell. <P>SOLUTION: In this solar system provided with the solar cell on a solar heat collector, electric load of the system is classified to a first load applying only the solar cell as a driving power source, a second load applying solar cell or commercial power source as the driving power source, and a third load for applying only the commercial power source as the driving power source, according to intended purposes. The power is directly supplied to the first load from the solar cell 3, and a power source switching device 41 selects one of the solar cell and the commercial power source according to surplus electricity of the solar cell 3 to supply power to the second load. The selection of the first load is performed within a range needing no large-scaled solar cell 3. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a solar system, and more specifically, uses a heating medium heated by a solar heat collector as a heat source to heat and raise hot water in a heat storage tank for use in hot water supply, or to heat by a solar heat collector The present invention relates to a solar system that uses the heated heat medium as a heat source for heating.

  Conventionally, this type of solar system has a solar heat circulation circuit for circulating a heat medium heated and heated by a solar heat collector to a heat exchanger, and a forced circulation of the heat medium in the solar heat circulation circuit. A circulation pump (heat collecting pump).

  Hot water for hot water supply uses the heat medium circulating in the solar heat circulation circuit to supply hot water in the heat storage tank (hot water storage tank) directly (internal heat exchange system with a heat exchanger in the heat storage tank) or indirectly Hot water in the heat storage tank is generated by heating and raising the temperature (external heat exchange system in which a heat circulation tank is separately provided with a circulation circuit for hot water heating and the heat exchanger is arranged in this circulation circuit for hot water heating). Use hot water to supply hot water. On the other hand, for heating, the heating medium in the heating medium circulation circuit (heating circuit) is heated and heated using the heating medium circulating in the solar heat circulation circuit, and the heating medium is heated. It is configured to be supplied to the instrument.

  By the way, in the solar system configured as described above, a solar cell is provided in addition to the solar heat collector, and the electric power obtained by the solar cell is used as driving power for a temperature sensor provided in a heat collecting pump or a heat storage tank. Therefore, it has been proposed to reduce the consumption of commercial power (see Patent Document 1).

Japanese Utility Model Publication No. 5-87461

  However, such a conventional solar system has the following problems, and improvements have been desired.

  That is, in the solar system configured as described above, the temperature of the hot water in the heat storage tank is lower than the hot water supply set temperature, or the temperature of the heating medium heated / heated by the solar heat collector is the heating medium temperature. If the temperature is lower than the temperature required for heating, the specified hot water supply operation or heating operation cannot be performed. Therefore, in order to prepare for such a case, most of this type of solar system has hot water for hot water supply or heating heat. An auxiliary heat source device for heating and raising the temperature of the medium to a desired temperature is provided.

  A combustion heating type heat source device using gas or oil as fuel is preferably used for the auxiliary heat source device. By providing such an auxiliary heat source device, this type of solar system has a fuel supply unit and a combustion unit. Are equipped with many electrical loads (for example, a solenoid valve for fuel supply, a blower fan for combustion, etc.), resulting in an increase in power consumption compared to a solar system without an auxiliary heat source device. There is a problem.

  On the other hand, since the solar cell attached to the solar heat collector is mainly used as a drive power source for the heat collection pump, a small solar panel having a power generation amount of, for example, about 5 to 10 W is used. For this reason, it is difficult to cover all of the electric load of the auxiliary heat source unit with such a small solar cell, while increasing the amount of power generated by the solar cell to cover all the power consumption of the electric load of the auxiliary heat source unit. If it tried to do so, there existed a problem that the cost concerning installation of a solar cell will become expensive while a momentary solar cell will enlarge.

  The present invention has been made in view of such problems, and the object of the present invention is to provide a solar system that suppresses an increase in the introduction cost of a solar cell and consumes less power from a commercial power source and has a low running cost. The purpose is to provide. In particular, the present invention provides a solar system suitable for a solar system provided with an auxiliary heat source device.

In order to achieve the above object, a solar system according to claim 1 of the present invention is a solar system in which a solar battery is attached to a solar heat collector, and includes a plurality of electric loads. The first load using only the solar cell as a driving power source, the second load using the solar cell or commercial power source as the driving power source, and the third load using only the commercial power source as the driving power source, depending on their use. A plurality of loads are provided as electric loads classified as the second load, and power supply by the solar cell is given priority between the plurality of electric loads classified as the second load. Priorities for performing are set, and at least the hot water pump provided in the circulation circuit for heating the water in the heat storage tank and the heating circulation for circulating the heating heat medium are set in the second load. Times And a bath pump provided in a bath remedy circulation circuit for bath remedy, and the bath pump has priority over at least one of the hot water storage pump and the heating pump. The ranking is set low.

  That is, in this solar system, the electric load provided in the solar system is a first load that uses only a solar cell as a driving power source, and a second load that uses a solar cell or a commercial power source as a driving power source, depending on the application. Since it is classified as a third load that uses only a commercial power source as a driving power source, the power generated by the solar cell is configured to be preferentially supplied to the first load. When there is surplus power that is not consumed by the first load, the surplus power is supplied to the second load. Since the second load uses a solar cell or a commercial power source as a driving power source, if there is power supply from the solar cell, it is used as the driving power, and the surplus power is insufficient and the power supply from the solar cell cannot be received. In such a case, the commercial power source is used as a driving power source, and power is supplied from the commercial power source. As a result, the power generated by the solar cell is consumed by the first load and the second load so as not to generate surplus power, and the power consumption of the commercial power source is suppressed by an amount corresponding to the power generation amount of the solar cell. be able to. On the other hand, since the electric load related to the quality and safety of the solar system is classified into the third load using only the commercial power source as the driving power source, stable power supply is performed, so that the performance of the solar system is It is prevented from being affected by the amount of power generation. That is, according to the present invention, it is possible to suppress the power consumption of the commercial power supply without deteriorating the quality of the solar system.

  In the classification of the electric loads, the large-sized (large amount of power generation) solar cell is obtained by limiting the electric loads classified as the first load to a certain limited electric load such as a heat collecting pump. The solar system of the present invention can be implemented without using That is, if a large-sized solar cell is used as the solar cell, the power consumption of the commercial power source can be suppressed by that amount. However, this causes a significant increase in the cost of the entire system. The first load is set so that the power consumption of the electric load to be classified does not become too large (for example, within a few watts), and a small solar cell having a power generation amount of several tens to several tens of watts is used. Is preferred. In this way, by limiting the power consumption of the first load, it is possible to use commercial solar cells that are the same as solar cells that have been used in conventional solar systems (or slightly larger without significant cost increase). The power consumption of the power supply can be suppressed.

In the solar system according to claim 1 , a priority order for supplying power by the solar battery is set between the second loads, and the solar battery is preferentially ordered in descending order of the priority according to the priority order. Is supplied. Therefore, in the solar system according to claim 2, power is supplied from the solar cell to the electric load having a high priority according to the amount of surplus power generated by the solar cell, and the surplus power is insufficient. Electric power is supplied from a commercial power source to an electric load having a low priority that cannot receive power from the commercial power source. Therefore, according to the solar system according to claim 1 , even when surplus power that cannot be consumed by the first load is generated in the power generation amount by the solar cell, the surplus power is consumed by the plurality of second loads without any trouble. Therefore, the power of the solar cell can be used without waste, and the effect of suppressing the power consumption of the commercial power source can be improved accordingly.

Further, in the solar system according to the claim 1, as the second load, provided with a hot water storage pump heating pump and a bath pump, any priority for bath pump of these the hot-water storage pumps or heating pump It is set lower than either. In other words, bath pumps for bathing are not suitable for power supply by solar cells because they are often used at night without sunlight, and have a large power consumption compared to hot water storage pumps and heating pumps. Therefore, if the surplus power of the solar cell is used to cover this, the size of the solar cell is likely to increase, so the priority for using the power of the solar cell is set low.

The solar system according to claim 2 of the present invention is the solar system according to claim 1 , wherein the third load includes at least a control unit of the solar system and a hot water mixing valve for hot water supply. To do.

That is, in the solar system according to claim 2 , at least the control unit that controls the solar system and the hot water mixing valve that generates hot water for hot water supply by mixing hot water with the commercial power source is the driving power source. Since these are classified into three loads, they receive a stable power supply from a commercial power source. Therefore, for example, it is possible to prevent the control unit from running out of electric power during the hot water supply operation and to disturb the control of the hot water mixing valve, or to make the hot water mixing valve inoperable due to insufficient electric power, thereby realizing a safe and stable hot water supply operation. be able to.

A hot water supply system according to a third aspect of the present invention is the solar system according to the first or second aspect , wherein the solar system includes an auxiliary heat source unit, and the various electric loads included in the auxiliary heat source unit include the first to the first types. It is classified into one of three loads.

That is, since the solar system according to claim 3 is provided with an auxiliary heat source device, the temperature of the hot water in the heat storage tank is lower than the preset hot water supply temperature, or heated / heated by a solar heat collector. Even in the case where the temperature of the heating medium is lower than the temperature required for heating the heating medium, the auxiliary heat source device can heat and raise the temperature of the hot water for heating and the heating medium to a desired temperature. Therefore, stable hot water supply and heating operation can be performed.

  Moreover, since the various electric loads provided in the auxiliary heat source device are classified as any one of the first load to the third load, the surplus power of the solar cell can be used as a drive power source on the auxiliary heat source device side, It becomes possible to suppress an increase in power consumption of the commercial power supply due to the addition of the auxiliary heat source unit.

  According to the solar system of the present invention, the electric load provided in the solar system, depending on the application, the first load that uses only the solar cell as the driving power source, and the second load that uses the solar cell or the commercial power source as the driving power source The power generated by the solar cell is preferentially supplied to the first load and is not consumed by the first load because it is classified as a third load using only the commercial power source as the driving power source. Since the electric power is used as a driving power source for the second load, the electric power generated by the solar battery can be consumed without waste, and thereby the power consumption of the commercial power source can be suppressed. At that time, by classifying the electrical load related to quality and safety as the third load, the present invention can be carried out without impairing the quality of the solar system.

  Further, in classifying the electric load, by limiting the electric load classified as the first load to a certain limited electric load, a solar cell having the same size as a conventionally used solar cell. The power consumption of the commercial power supply can be suppressed while using the system, and the present invention can be applied without increasing the cost of the entire system.

In addition, a plurality of electric loads are provided as electric loads classified as the second load, and by setting a priority order to preferentially supply power by the solar cells between the second loads, Even if surplus power that cannot be consumed by the first load is generated in the power generation amount, the surplus power is consumed by the plurality of second loads without any trouble, so that the power of the solar cell can be used without waste. It is possible to improve the effect of suppressing the power consumption of the commercial power supply. Particularly, in the present invention, a hot water storage pump, a heating pump, and a bath pump are provided as the second load, and the priority of the bath pump that is often used at night without sunlight is a hot water storage pump or a heating pump. Since it is set lower than any one of these, it can be used without waste without leaving the power of a solar cell.

  In addition, the solar system of the present invention can perform stable hot water supply and heating operation by providing the auxiliary heat source device, and the various types of electric loads provided in the auxiliary heat source device can also include the first load to the first load. By classifying it as one of the three loads, it becomes possible to cover a part of the increase in power consumption due to the addition of the auxiliary heat source unit with solar cells, and to suppress the increase in power consumption of commercial power supply Is possible.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an example of a solar system according to the present invention. A solar system 1 shown in FIG. 1 is a solar system in which a solar battery 3 is provided in combination with a solar heat collector 2, and is configured using the solar battery 3 as a driving power source together with a commercial power source (not shown). Will be described later).

  The solar system 1 shown in FIG. 1 is a solar system configured to realize two functions of hot water supply and heating using solar heat, and includes an auxiliary heat source unit 5 for these functions. ing. That is, the solar system 1 shown in FIG. 1 is a solar with an auxiliary heat source device in which an auxiliary heat source device 5 is provided in a system main body 4 provided with a functional component for using solar heat recovered by the solar heat collector 2. Shows the system.

  The system body 4 is for heating the water stored in the heat storage tank 6 and the solar heat circulation circuit (first circulation circuit) A for taking in the solar heat collected by the solar heat collector 2 into the system body 4. Boiling circulation circuit (second circulation circuit) B, heating heating circulation circuit C for heating the heating medium using the heating medium circulating in the solar heat circulation circuit A, and the heating heating medium are circulated. A heating circulation circuit D and a bath remedy circulation circuit E for bath remedy.

  More specifically, the solar heat circulation circuit A is a circulation circuit for circulating a heat medium for solar heat collection heated and heated by the solar heat collector 2 provided outside the system body 4, The circulation circuit A is provided with a heat collection pump 7 for forcibly circulating the heat medium. By driving the heat collection pump 7, the heat medium heated and heated by the solar heat collector 2 is a three-way valve. 8, It is comprised so that it may circulate to the solar-heat collector 2 via the heat exchanger 9 and the reserve tank 10. As shown in FIG. In addition, the heat collection pump 7 is comprised with the circulation pump which uses DC power supply as drive power, and uses the solar cell 3 as the main drive power supply in this embodiment so that it may mention later.

  Here, as the solar heat collector 2, a heat collector having a well-known configuration for heating and heating the heat medium using solar heat by solar radiation is used. The solar heat collector 2 is disposed in a suitable place with good sunlight such as a rooftop. The three-way valve 8 is a valve device provided so that a part of the heating medium circulating in the solar heat circulation circuit A can be introduced into the heating / heating circulation circuit C. When the heating medium is heated, the three-way valve 8 is used. The heating and heating circuit C side is opened, and the heating medium is also supplied to the heating and heating circuit C.

  The heat exchanger 9 is a liquid-liquid heat exchanger used for boiling or increasing the water in the heat storage tank 6, and the solar heat circulation circuit A is connected to the primary side of the heat exchanger 9. Has been. The reserve tank 10 is an open-air tank provided for absorbing expansion of the heat medium and degassing. The reserve tank 10 can be a sealed tank.

  The above-mentioned boiling circuit B is a circulation circuit for heating the water stored in the heat storage tank 6 and is configured to take out the water in the heat storage tank 6 and circulate it outside the heat storage tank. Specifically, the circulation circuit B is provided with a hot water storage pump 11, and by driving the hot water storage pump 11, low-temperature water stored at the bottom of the heat storage tank 6 passes through the boiling forward pipe 12. It is sucked out and introduced into the secondary side of the heat exchanger 9, heated and heated by the heat exchanger 9, and introduced into the upper part of the heat storage tank 6 through the boiling return pipe 13. ing. As the hot water storage pump 11, a circulation pump using an AC power source as a driving power source is used in the present embodiment.

  Here, the heat storage tank 6 includes a hot water storage tank for storing hot water for hot water supply therein. As this hot water storage tank, for example, a known hot water storage tank that stores hot water while forming temperature stratification in the tank is suitably used. Although not shown, the heat storage tank 6 is provided with a plurality of temperature sensors in the height direction, and these temperature sensors are used as detection means for detecting the temperature of the hot water in the heat storage tank 6. Yes.

  At the top and bottom of this heat storage tank 6, there are provided connection parts (top connection part 14 at the top and bottom connection part 15 at the bottom) for connecting to the above-mentioned boiling forward pipe 12, boiling return pipe 13 and the like. The hot water is allowed to flow into and out of the heat storage tank 6 through these connection portions 14 and 15.

  Specifically, in order to introduce hot water stored in the heat storage tank 6 in addition to the boiling return pipe 13 to the top connection portion 14 into the hot water introduction side of the mixing valve (hot water mixing valve for hot water supply) 16. The mixed valve hot water side flow path 17 is connected. On the other hand, a water supply flow path 19 branched from a water supply pipe 18 connected to a water source is connected to the bottom connection portion 15 in addition to the boiling up pipe 12. The water supply pipe 18 is branched into the water supply flow path 19 and the mixing valve water side flow path 20, and the mixing valve water side flow path 20 is connected to the water introduction side of the mixing valve 16.

  The hot water output side of the mixing valve 16 is connected to the hot water supply pipe 21, and is connected to the hot water supply water inlet 51 a of the auxiliary heat source machine 5. In the figure, a high temperature hot water monitoring valve 23 is disposed in the bypass flow path 22 between the water supply pipe 18 and the hot water supply pipe 21. This high-temperature hot water monitoring valve 23 introduces water from the water supply pipe 18 to the hot water supply pipe 21 when the temperature of the hot water from the mixing valve 16 exceeds a predetermined value, and lowers the temperature of the hot water flowing into the auxiliary heat source unit 5. Is provided.

  The heating / heating circulation circuit C is a circulation circuit for heating a heating heat medium using a heat medium circulating in the solar heat circulation circuit A. The circulation circuit C includes a liquid / liquid heat exchanger for heating. 25 is provided. Specifically, the heating and heating circuit C is configured to return the heat medium introduced from the three-way valve 8 to the solar heat circuit A again through the heat exchanger 25, and the liquid-liquid heat exchange. The heating and heating circuit C is connected to the primary side of the vessel 25. The forced circulation of the heat medium in the heating and heating circuit C is performed by driving the heat collecting pump 7.

  The heating circulation circuit D is a circulation circuit for supplying a heating heat medium heated by the liquid-liquid heat exchanger 25 for heating to a heating terminal. In the present embodiment, the heating circulation circuit D is used as the heating circulation circuit D. Two circulation circuits are provided, a circulation circuit to the high temperature heating terminal Ha and a circulation circuit to the low temperature heating terminal Hb. Specifically, the system main body 4 is provided with a heating return pipe 26 for taking in the heating medium radiated from the high-temperature heating terminal Ha and the low-temperature heating terminal Hb. The heating medium to be heated is introduced to the secondary side of the liquid-liquid heat exchanger 25, and the heating medium heated and heated by the liquid-liquid heat exchanger 25 is connected to the heating forward pipe 27. The heating heat medium is supplied to the high temperature heating terminal Ha and the low temperature heating terminal Hb via the auxiliary heat source unit 5.

  Here, as the high-temperature heating terminal Ha, for example, a heating terminal driven by a high-temperature (specifically, about 80 ° C.) heat medium such as a bathroom heating device or a fan convector is used. On the other hand, as the low-temperature heating terminal Hb, for example, a heating terminal that is driven by a heat medium having a temperature lower than that of the high-temperature heating terminal Ha (specifically, about 40 ° C.) like the floor heating apparatus is used.

  The bath recirculation circuit E is a circulation circuit used when retreating the bath F using the auxiliary heat source unit 5. Although FIG. 1 shows a state in which the bath chase circulation circuit E is taken into the system body 4, the bath chase circulation circuit E does not use solar heat. It may be directly connected to the auxiliary heat source machine 5 without being taken in.

  Reference numeral 30 in the drawing indicates a control unit of the system main body 4. The control unit 30 is a control device for performing operation control of each part of the system main body 4 and control for interlocking the system main body 4 and the auxiliary heat source unit 5, and has a microcomputer equipped with various programs and data for control. And is connected in communication with the control unit 56 of the auxiliary heat source machine 5. That is, the control unit 30 is based on detection signals from various sensors (not shown) arranged in each part of the system body 4, control signals given from the control unit 56 of the auxiliary heat source unit 5 described later, and the like. The operation of each part of the solar system 1 and the auxiliary heat source machine 5 is controlled to perform hot water supply operation and heating operation.

  Here, the details of the control relating to the hot water supply / heating operation are the same as those of a general solar system with an auxiliary heat source device. Specifically, for example, with respect to the hot water supply operation, the hot water mixing ratio of the mixing valve 16 is set based on the information of the hot water supply set temperature given from the control unit 56 of the auxiliary heat source unit 5, or the hot water of the mixing valve 16 is set. If the hot water supply set temperature cannot be discharged by adjusting the mixing ratio, the auxiliary heat source unit 5 is instructed to perform a heating operation. Moreover, the temperature difference between the solar heat collector 2 (the heat medium flowing through the solar heat collector 2) and the heat storage tank 6 is equal to or greater than a predetermined value (however, the temperature of the solar heat collector 2> the temperature of hot water in the heat storage tank 6). Then, the heat collecting pump 7 is operated to circulate the heat medium in the solar heat circulation circuit A, and the hot water storage pump 11 is operated to heat and raise the temperature of the hot water in the heat storage tank 6 by the heat exchanger 9 ( (Boiling / boiling operation). In addition, when the temperature difference between the solar heat collector 2 and the heat storage tank 6 becomes less than a predetermined value, the boiling / boiling operation is terminated by stopping the heat collection pump 7 and the hot water storage pump 11.

  On the other hand, regarding the heating operation, upon receiving a heating request from a controller (not shown) of each of the high-temperature and low-temperature heating terminals Ha and Hb, the solar heat collector 2 (the heat medium flowing through the solar heat collector 2) and the heating If the temperature difference of the heating medium is equal to or greater than a predetermined value (however, the temperature of the solar heat collector 2> the temperature of the heating medium), the heating / heating circuit C side of the three-way valve 8 is made conductive and the heat collecting pump 7 Is operated to supply a heating medium to the heating and heating circuit C side, and further, a control signal for operating the heating pump 54 is transmitted to the auxiliary heat source unit 5. At that time, if the temperature difference between the solar heat collector 2 and the heating medium is less than a predetermined value, the auxiliary heat source unit 5 is configured to instruct the heating operation of the heating circuit D.

  In the solar system shown in the present embodiment, the control unit 30 of the system body 4 performs contact opening / closing control with respect to a relay 40 (see FIG. 3) described later in addition to the above-described control of the hot water supply / heating operation. It is also configured as follows.

  On the other hand, in the auxiliary heat source unit 5, the temperature of the hot water in the heat storage tank 6 is lower than the hot water supply set temperature, or the temperature of the heating medium heated / heated by the solar heat collector 2 is used for heating the heating medium. A heating device provided for heating / heating a hot water for hot water supply or a heating medium for heating to a predetermined temperature when the temperature is lower than a required temperature. As the heat source unit 5, a combustion type heat source unit having a known mode using gas or oil as fuel is used.

  The auxiliary heat source device 5 shown in the figure is configured by a hot water supply / heating heat source device having functions of hot water supply, heating, and bathing, and as a hot water outlet / outlet for hot water supply, a hot water inlet / outlet portion 51a and a hot water outlet / outlet portion 51b, A heating water inlet 52a and a heating water outlet 52b are provided as inlets and outlets for the heating medium, and a hot water inlet 53a and a hot water outlet 53b are provided as hot water outlets for bathing.

  Specifically, the auxiliary heat source unit 5 includes a hot water supply heating unit (not shown) between the hot water supply water inlet 51a and the hot water supply water outlet 51b, and the hot water supply pipe 21 is connected to the hot water supply water inlet 51a. The supplied hot water is heated and heated by a heating means for hot water supply, and can be supplied from a hot water supply / discharge section 51b to a tip end plug (not shown) such as a currant through a hot water supply pipe 28. A heating means (not shown) is also provided between the heating water inlet 52a and the heating water outlet 52b, and the heating heat medium supplied from the heating forward pipe 27 to the heating water inlet 52a is used for heating. The high temperature heating terminal Ha is supplied to the heating terminals Ha and Hb via the high temperature forward terminal 29a and the low temperature heating terminal Hb via the low temperature heating forward pipe 29b. Yes. Furthermore, a bath remedy heating means (not shown) is provided between the bath remedy water inlet 53a and the bath remedy water outlet 53b, and the hot water supplied from the bath F is heated by the bath remedy heating means. It is configured so that it can be heated and heated to return to the bath F.

  In this connection, in the present embodiment, a heating pump 54 for circulating a heating heat medium in the heating circulation circuit D is provided inside the auxiliary heat source machine 5, and the bath F in the bath additional circulation circuit E is provided. A bath pump 55 for circulating hot water is provided. In the present embodiment, a circulation pump using an AC power source as a driving power source is used for the heating pump 54 and the bath pump 55.

  Reference numeral 56 in the figure indicates a control unit of the auxiliary heat source machine 5, and this control unit 56 is a control device for controlling each part of the auxiliary heat source machine 5, and includes various programs and data for control. It has a microcomputer. And based on the detection signal from the various sensors (not shown) arrange | positioned at each part of the auxiliary heat source machine 5, the control signal given from the control part 30 of the system main body 4 mentioned above, etc. of the auxiliary heat source machine 5 The operation is controlled, and the hot water supply operation and the heating operation described above are performed.

  In the present embodiment, an operation device (remote controller) 57 is provided in the control unit 56 of the auxiliary heat source machine 5. The operation device 57 constitutes a remote control for the solar system 1, and includes an operation unit (not shown) for inputting various operation commands to the solar system 1 and a display unit (not shown) for displaying the status of the solar system 1. )) As the main part. And this operating device 57 is arrange | positioned in the suitable place where a user can utilize easily, such as a kitchen and a living room, for example, and the setting operation of hot water supply preset temperature etc. can be performed via this operating device 57.

  The solar cell 3 is a power generation means provided to cover part of the power consumed by the solar system 1, and the solar cell 3 is a well-known power generator that uses photovoltaic power generated by solar radiation. It is comprised with the solar cell of an aspect. And this solar cell 3 is also arrange | positioned like the said solar-heat collector 2 in the sunny place, such as a rooftop.

  Therefore, in the solar system 1 configured as described above, in the present invention, various electric loads provided in the solar system 1 are each a first load that uses only the solar cell 3 as a driving power supply, depending on the application. They are classified into a second load using a solar battery or a commercial power source as a driving power source and a third load using only a commercial power source as a driving power source.

  And it is comprised so that electric power may be supplied only from the solar cell 3 with respect to the electric load classified into the 1st load. In addition, the electric load classified as the second load is configured to be supplied with surplus power generated when power is supplied from the solar cell 3 to the first load. In other words, the second load is configured to receive power from the solar cell 3 when there is surplus power in the power generation amount of the solar cell 3, and if there is no surplus power in the power generation amount of the solar cell 3, power is supplied from the commercial power source. It is configured to receive a supply. At this time, when there are a plurality of electric loads classified as the second load, a priority order for preferentially supplying power by the solar cell 3 is set between the plurality of electric loads. According to this priority order, the surplus power of the solar cell 3 is preferentially supplied in order from the electric load with the highest priority order.

  Therefore, in the solar system 1 to which the present invention is applied, the electric loads are classified so that most of the electric power generated by the solar cells 3 is consumed by the electric loads classified into the first load and the second load. Thus, the power consumption of the commercial power source is suppressed by an amount corresponding to the power generation amount of the solar cell 3.

  In the classification of the electric loads, as will be described later, it is preferable that the electric loads classified as the first load be limited to a certain electric load such as the heat collecting pump 7. The present invention can be carried out without using a solar cell. That is, if a large-sized solar cell with a large amount of power generation is used as the solar cell 3, the power consumption of the commercial power source can be suppressed by that amount. However, the large-sized solar cell is expensive, and the installation cost is high. This leads to a problem that the introduction cost of the system is significantly increased. Therefore, in the implementation of the present invention, a small-sized solar cell having a power generation amount of several watts to about several tens of watts and being easy to construct is used. The electric load classified as the first load is set within a range (that is, at least not exceeding the power generation amount of the solar cell 3).

  In contrast, the electric load classified as the third load is configured to be supplied with power only from the commercial power source. That is, a stable power supply is performed on the third load without being influenced by the solar radiation conditions such as the weather. Therefore, an electrical load that may affect the quality and safety of the solar system 1 is preferentially distributed to the third load, and the first load and the second load are related to the amount of power generated by the solar cell 3. All electric loads that are not classified are classified into the third load.

  FIG. 2 is an explanatory diagram illustrating an example of classification of electric loads. This illustrated example shows an example of classification according to the above-described method. In this illustrated example, only the heat collection pump 7 of the solar system 1 is classified as the first load, and the hot water storage pump 11 and the heating pump. 54 and the bath pump 55 are classified into the second load. Between the second loads, the bath pump 55 has a lower priority than the hot water storage pump 11 and the heating pump 54. In consideration of quality and safety, at least the mixing valve 16, the control unit 30 of the system main body 4, and the control unit 56 (including the operation device 57) of the auxiliary heat source unit 5 are classified as the third load. . All other electrical loads are classified as the third load.

  Here, the heat collecting pump 7 is classified as the second load only during the trial operation (forced operation of the heat collecting pump 7 performed experimentally) at the time of construction of the solar system 1 or maintenance after construction. Is in the first load (see FIG. 2). This is because the heat collection pump 7 operates in a normal use state (a state other than the trial operation) when the temperature of the heat medium of the solar heat collector 2 is increased by solar heat due to solar radiation (that is, a solar cell). 3 (when there is solar radiation that can generate electricity at 3), and the operation time is relatively long. This is to suppress consumption. On the other hand, when the heat collection pump 7 is operated during the test operation, there is not always sufficient solar radiation to generate power with the solar cell 3, so the heat collection pump 7 is used as the second load during the test operation. This is because the heat collection pump 7 can be operated by a commercial power source when the power generation amount of the solar cell 3 is insufficient.

  In addition, the hot water storage pump 11 and the heating pump 54 are classified as the second load because they are temporarily unstable due to fluctuations in the amount of power generated by the solar cell 3 due to the influence of solar radiation. This is because the hot water supply performance and the heating performance are not significantly impaired, and it is considered that the user does not experience the change. Moreover, the reason why the priority order of the bath pumps 55 classified as the second load is set lower than these is that the bath pump 55 used at the time of bath remedy operates mainly at night when there is no sunlight. This is because a high-capacity (high power consumption) pump is usually used for the bath pump 55. For this reason, the bath pump 55 only needs to be set lower in priority than at least one of the hot water storage pump 11 and the heating pump 54. In particular, when an internal heat exchange system that directly heats hot water in the heat storage tank 6 using a heat medium circulating in the solar heat circulation circuit A is employed, the hot water storage pump 11 is also used by the heat collecting pump 7. In the case of such an internal heat exchange system, the priority of the bath pump 55 is set lower than that of the heating pump 54.

  Furthermore, the mixing valve 16 and the control unit 30 of the system main body 4 and the control unit 56 of the auxiliary heat source machine 5 are classified as the third load. The mixing valve 16 is a component that directly affects the quality of hot water supply and is stable. This is because control is required, and both the control unit 30 and the control unit 56 are always required to perform operation control and monitoring of each unit.

  FIG. 3 is a conceptual diagram showing an example of a circuit configuration for supplying power to each electric load according to the classification of the electric loads. As shown in FIG. 3, the electric load (heat collecting pump 7 in the illustrated example) classified as the first load using only the solar cell 3 as the driving power supply directly supplies power from the solar cell 3 via the relay 40. Configured to receive. That is, for the first load, the control unit 30 controls the contact of the relay 40 (contact opening / closing control) so that the electric power from the solar cell 3 is directly supplied (this is the case) In the embodiment, the heat collecting pump 7 is classified as the second load at the time of the trial operation, so that it can be supplied with electric power via the power supply switching device 41 as in the case of the second load described later as shown in the illustrated example. (Refer to the chain line in the figure)).

  Here, in the present embodiment, the heat collection pump 7 classified as the first load employs a circulation pump that uses a DC power supply as a drive power supply. Therefore, the power (DC) generated by the solar cell 3 is described later. Since the inverter 42 does not go through unlike the second load, power is efficiently supplied to the first load without any loss due to the inverter. In addition, when using the electrical load which uses AC power supply as a drive power supply as 1st load, it is comprised so that the electric power from the solar cell 3 may be supplied via an inverter.

  In contrast, the second load that uses the solar battery 3 or the commercial power supply CP as a driving power supply is configured to be supplied with power from the solar battery 3 or the commercial power supply CP via the power supply switching device 41.

  Specifically, a predetermined AC power supply (for example, AC 100 V) is supplied to the power supply switching device 41 from the commercial power supply CP side, and the same specifications as the commercial power supply CP are also supplied from the solar battery 3 side via the inverter 42. The converted electric power is supplied to an AC power source (for example, AC 100V). When electric power is supplied from the solar cell 3 to the electric load classified as the first load, surplus power that cannot be consumed by the first load is supplied via the inverter 42.

  And this power supply switching device 41 is provided with the output detection means (not shown) which detects the output state (power generation amount) of the solar cell 3, and it is based on the detection state of this output detection means to 2nd load. Electric power from the solar cell 3 side and electric power from the commercial power source CP side are switched and supplied to the classified electric loads (in the illustrated example, the hot water storage pump 11, the heating pump 54, and the bath pump 55).

  That is, based on the detection state of the output detection means, when it is determined that power can be supplied from the solar cell 3 to the second load (there is surplus power), the second load such as the hot water storage pump 11 is used. On the other hand, the electric power from the solar cell 3 side is supplied. At that time, according to the detection state of the output detection means (the amount of surplus power), the electric power on the solar cell 3 side is supplied in order from the electric load with the highest priority, and the electric load with the lower priority that cannot distribute the surplus power ( For example, power from the commercial power PC side is supplied to the bath pump 55).

  Note that, when the power supply is switched through the power supply switching device 41 as described above, there is a possibility that a reverse power flow to the commercial power supply CP side may occur. Therefore, in this embodiment, a reverse power flow to the commercial power supply CP side is generated. The prevention device 43 and the current monitoring circuit 44 are provided, and are configured to consume power in the reverse flow prevention device 43 when a reverse flow occurs. Further, the surplus power control device 45 and the storage battery 46 are provided on the solar cell 3 side, and when there is electric power that is not consumed by the first load or the second load (for example, both the first load and the second load operate). When the surplus power control device 45 detects this, the power generated by the solar cell 3 is stored in the storage battery 46.

  On the other hand, the third load that uses only the commercial power supply CP as a driving power supply is configured such that power is directly supplied from the commercial power supply CP without going through the power supply switching device 41. The third load can be configured to supply power directly from the commercial power supply CP as shown in the figure. For example, power is supplied from the commercial power supply CP via the power supply switching device 41. It is also possible to configure in this way. That is, in this case, the power supply switching device 41 is set not to supply power from the solar cell 3 side to the electric load classified as the third load.

  Note that the above-described embodiments merely show preferred embodiments of the present invention, and the present invention is not limited to these, and various design changes can be made within the scope thereof.

  For example, in the above-described embodiment, the solar system 1 including the auxiliary heat source device 5 has been described. However, since the present invention is applied to a solar system including a plurality of electric loads, the auxiliary heat source device 5 is It is also applicable to solar systems that do not have it. Similarly, the present invention can also be applied to a solar system provided with an auxiliary heat source unit 5 that does not have a heating function or a bath remedy function. Furthermore, the heating function may be realized by the auxiliary heat source unit 5, and the three-way valve 8, the heating / heating circulation circuit C, and the heat exchanger 25 may not be provided.

  In the above-described embodiment, the case where the system main body 4 and the auxiliary heat source unit 5 are configured as separate units has been described. However, the system main body 4 and the auxiliary heat source unit 5 may be configured to be accommodated in one unit (housing). . In this case, the control unit 30 of the system body 4 and the control unit 56 of the auxiliary heat source machine 5 can be combined into one control device.

  Moreover, in embodiment mentioned above, although the case where the external heat exchange system was employ | adopted regarding the heating and temperature rising of the hot water in the heat storage tank 6 was shown, the coil-shaped heat exchanger is arrange | positioned in the heat storage tank 6, etc. The present invention is also applicable to an internal heat exchange type solar system that directly heats and raises the temperature of hot water in the heat storage tank 6 using a heat medium circulating in the solar heat circulation circuit A. Furthermore, the water in the heat storage tank 6 is not limited to tap water, but may be configured as another heat medium, and the heat of the heat medium may be supplied to various heat loads such as general hot water supply and heating.

  In the above-described embodiment, the case where the reverse power flow prevention device 43 is provided on the commercial power supply CP side is shown. However, when there is power that cannot be consumed by the first load and the second load, the surplus power is It is also possible to adopt a configuration that can sell power to an electric power company.

It is a schematic block diagram which shows an example of the solar system which concerns on this invention. It is explanatory drawing which shows an example of classification | category classification of the electric load in the solar system. It is a conceptual diagram which shows an example of the circuit structure for supplying electric power to each electric load in the solar system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar system 2 Solar heat collector 3 Solar cell 4 System main body 5 Auxiliary heat source machine 6 Heat storage tank 7 Heat collection pump 9 Heat exchanger 11 Hot water storage pump 16 Mixing valve (hot water mixing valve for hot water supply)
18 Water supply pipe 28 Hot water supply pipe 30 Control part 41 Power supply switching device (output detection means)
54 Heating pump 55 Bath pump 56 Control part A of auxiliary heat source machine Solar thermal circulation circuit (first circulation circuit)
B Boiling circuit (second circuit)
C Heating / circulation circuit D Heating / circulation circuit E Bath bath circulation circuit

Claims (3)

In a solar system with solar cells attached to a solar heat collector and equipped with a plurality of electric loads,
The plurality of electric loads include a first load that uses only the solar cell as a driving power source, a second load that uses the solar cell or commercial power source as a driving power source, and a driving power source that uses only the commercial power source depending on the application. And the third load ,
A plurality of loads are provided as electric loads classified as the second load, and a priority order for preferentially supplying power by the solar cell between the plurality of electric loads classified as the second load. Is set, and the second load includes at least a hot water storage pump provided in a circulation circuit for heating water in the heat storage tank and a heating provided in a heating circulation circuit for circulating a heating heat medium. A pump and a bath pump provided in a bath memory circulation circuit for bath memory,
The solar system according to claim 1, wherein the priority of the bath pump is set lower than that of at least one of the hot water storage pump and the heating pump . The solar system according to claim 1 , wherein the third load includes at least a control unit of the solar system and a hot water mixing valve for hot water supply. The solar system according to claim 1 or 2 , wherein the solar system includes an auxiliary heat source unit, and various electric loads included in the auxiliary heat source unit are classified into any one of the first to third loads. system.

Images