JP6383564B2 - Solar energy utilization system - Google Patents

Description

  The present invention relates to a technology for a solar energy utilization system that artificially decomposes water (artificial photosynthesis) using a catalyst that decomposes water by receiving sunlight.

  Conventionally, a technique for generating hydrogen using a photosynthetic bacterium has been publicly known. For example, as described in Patent Document 1.

  Patent Document 1 describes a solar bioenergy conversion device using photosynthetic bacteria. In the solar bioenergy conversion device, photosynthetic bacteria receive sunlight to generate hydrogen. The hydrogen can be used as a fuel. The hydrogen can also be supplied to the fuel cell to generate electricity.

  Also, in recent years, as a technology for obtaining an energy source such as hydrogen using sunlight, an artificial photosynthesis device that artificially decomposes water (artificial photosynthesis) using a catalyst that decomposes water by receiving sunlight. Are known. In the artificial photosynthesizing apparatus, hydrogen can be obtained by decomposing water by irradiating the catalyst with sunlight.

  However, in general, such an artificial photosynthesis device has low solar energy conversion efficiency, and improvement of solar energy conversion efficiency is desired.

JP-A-6-350119

  The present invention has been made in view of the above situation, and the problem to be solved is a solar energy utilization system including an artificial photosynthesis device having a catalyst that decomposes water upon receiving sunlight. The object is to provide a solar energy utilization system capable of improving the conversion efficiency.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1, an artificial photosynthesis device having a catalyst that decomposes water by receiving sunlight, a heat exchange device that can exchange heat between the artificial photosynthesis device, and a heat medium to store heat A heat storage device that stores heat, a heat medium circulation device that transfers heat by circulating a heat medium between the heat exchange device and the heat storage device, and a first temperature detection means that detects the temperature of the artificial photosynthesis device The second temperature detecting means for detecting the temperature of the heat storage device, the temperature of the artificial photosynthesis device is lower than the first target temperature, and the temperature of the artificial photosynthesis device is lower than the temperature of the heat storage device, A control device that performs a first control for transferring heat of the heat storage device to the artificial photosynthesis device by circulating a heat medium between the heat exchange device and the heat storage device by the heat medium circulation device; comprising, the control When performing the first control at a time when the artificial photosynthetic apparatus cannot receive sunlight, the device calculates the amount of heat necessary for the temperature of the artificial photosynthesizer to reach the first target temperature. , Calculating the time required to transmit the necessary heat amount from the heat storage device to the artificial photosynthesis device, and from the current time to the time when the artificial photosynthesis device is predicted to be able to receive sunlight The first control is performed only when the time falls below the required time .

According to a second aspect of the present invention, when the temperature of the artificial photosynthesis device is higher than a second target temperature and the temperature of the artificial photosynthesis device is higher than the temperature of the heat storage device, the control device is The second control for transferring the heat of the artificial photosynthesis device to the heat storage device is performed by circulating a heat medium between the heat exchange device and the heat storage device .

In the present invention, the second target temperature is set to a value higher than the first target temperature .

According to a fourth aspect of the present invention, when the first target temperature is higher than the temperature of the heat storage device, the control device uses the temperature of the heat storage device as a value of the first target temperature .

According to claim 5, heat is stored by storing an artificial photosynthesis device having a catalyst that decomposes water by receiving sunlight, a heat exchange device that can exchange heat between the artificial photosynthesis device, and a heat medium. A heat storage device, a heat medium circulation device that transfers heat by circulating a heat medium between the heat exchange device and the heat storage device, first temperature detection means that detects the temperature of the artificial photosynthesis device, and The second temperature detecting means for detecting the temperature of the heat storage device, and the temperature of the artificial photosynthesis device is lower than the first target temperature, and the temperature of the artificial photosynthesis device is lower than the temperature of the heat storage device, the heat A controller that performs a first control to transmit heat of the heat storage device to the artificial photosynthesis device by circulating a heat medium between the heat exchange device and the heat storage device by a medium circulation device. The control device If the first target temperature is higher than the temperature of the heat storage device, it is to use a temperature of the heat storage device as the value of the first target temperature.

  As effects of the present invention, the following effects can be obtained.

In Claim 1, the conversion efficiency of solar energy can be improved.
That is, the temperature of the artificial photosynthesis device can be adjusted by circulating the heat medium between the heat exchange device and the heat storage device. The conversion efficiency of solar energy can be improved by adjusting the temperature of the artificial photosynthesis device to a temperature range where the reaction rate of the catalyst is increased. Moreover, the heat | fever of an artificial photosynthesis apparatus can be stored in a thermal storage apparatus, and the conversion efficiency of solar energy can be improved more by using the said heat | fever for arbitrary purposes.
Further, when the temperature of the artificial photosynthesis device is lower than the first target temperature, the heat of the heat storage device can be transmitted to the artificial photosynthesis device, and the temperature of the artificial photosynthesis device can be raised. At this time, by setting the value of the first target temperature in the vicinity of the lower limit value of the temperature region in which the reaction rate of the catalyst becomes high, the reaction rate of the catalyst can be increased, and as a result, the conversion efficiency of solar energy is improved. be able to.
Moreover, the temperature of the artificial photosynthesis apparatus can be raised to the first target temperature in accordance with the time when the artificial photosynthesis apparatus is expected to receive sunlight. Thus, water can be efficiently decomposed from the time when the artificial photosynthesis device starts receiving sunlight.

In Claim 2 , the conversion efficiency of solar energy can be improved.
That is, when the temperature of the artificial photosynthesis device is higher than the second target temperature, the heat of the artificial photosynthesis device can be transferred to the heat storage device, and the temperature of the artificial photosynthesis device can be lowered. At this time, by setting the value of the second target temperature in the vicinity of the upper limit value of the temperature range in which the reaction rate of the catalyst becomes high, the reaction rate of the catalyst can be increased, and thus the conversion efficiency of solar energy is improved. be able to. Moreover, the heat transmitted to the heat storage device can be used for any purpose, and the conversion efficiency of solar energy can be further improved.

In Claim 3 , the conversion efficiency of solar energy can be improved.
That is, the temperature of the artificial photosynthesis device can be adjusted to be not lower than the first target temperature and not higher than the second target temperature. At this time, by setting the values of the first target temperature and the second target temperature in the vicinity of the lower limit value and the upper limit value of the temperature region where the reaction rate of the catalyst becomes high, respectively, the reaction rate of the catalyst can be increased, As a result, the conversion efficiency of solar energy can be improved. Moreover, the heat transmitted to the heat storage device can be used for any purpose, and the conversion efficiency of solar energy can be further improved.

In claim 4 , when the temperature of the artificial photosynthesis device cannot be raised to the first target temperature, the temperature of the artificial photosynthesis device can be raised as much as possible (that is, to the temperature of the heat storage device). . Thereby, the conversion efficiency of solar energy can be improved as much as possible.

In Claim 5 , the conversion efficiency of solar energy can be improved.
That is, the temperature of the artificial photosynthesis device can be adjusted by circulating the heat medium between the heat exchange device and the heat storage device. The conversion efficiency of solar energy can be improved by adjusting the temperature of the artificial photosynthesis device to a temperature range where the reaction rate of the catalyst is increased. Moreover, the heat | fever of an artificial photosynthesis apparatus can be stored in a thermal storage apparatus, and the conversion efficiency of solar energy can be improved more by using the said heat | fever for arbitrary purposes.
Further, when the temperature of the artificial photosynthesis device is lower than the first target temperature, the heat of the heat storage device can be transmitted to the artificial photosynthesis device, and the temperature of the artificial photosynthesis device can be raised. At this time, by setting the value of the first target temperature in the vicinity of the lower limit value of the temperature region in which the reaction rate of the catalyst becomes high, the reaction rate of the catalyst can be increased, and as a result, the conversion efficiency of solar energy is improved. be able to.
When the temperature of the artificial photosynthesis device cannot be raised to the first target temperature, the temperature of the artificial photosynthesis device can be raised as much as possible (that is, to the temperature of the heat storage device). Thereby, the conversion efficiency of solar energy can be improved as much as possible.

The schematic diagram which showed the whole structure of the solar energy utilization system. Schematic which showed the characteristic of the organic type biocatalyst. The flowchart which showed the process of the preheat time determination control. The flowchart which showed the process of preheat execution control, temperature rising control, and heat collection control. (A) The figure which showed the 1st modification of the artificial photosynthesis apparatus and the 1st heat exchange apparatus. (B) The figure which showed the 2nd modification similarly. (C) The figure which showed the 3rd modification similarly.

First, the solar energy utilization system 1 according to the present embodiment will be described with reference to FIG.
In the following description, water having a relatively low temperature is described as “water”, and water having a relatively high temperature is described as “hot water”. However, there is no substantial difference between water and hot water other than the difference in temperature.

  The solar energy utilization system 1 is for utilizing solar energy obtained by receiving sunlight. The solar energy utilization system 1 mainly includes an artificial photosynthesis device 10, a first heat exchange device 20, a heat storage device 30, a heat medium circulation device 40, a first temperature sensor 50, a second temperature sensor 60, and a control device 70.

  The artificial photosynthesis device 10 has a catalyst that decomposes water by receiving sunlight, and artificially decomposes water (artificial photosynthesis) by receiving sunlight. Here, “artificial photosynthesis” is to artificially generate an energy source such as hydrogen and oxygen using water and light (especially sunlight in this embodiment). The artificial photosynthesis apparatus 10 is installed in a sunny place. The artificial photosynthesis apparatus 10 mainly includes a housing 11 and a catalyst accommodated in the housing 11.

  The casing 11 is formed in a rectangular parallelepiped shape (substantially flat plate shape) having a wide width in the front-rear direction and the left-right direction with respect to the thickness in the vertical direction so that sunlight can be received on a wide surface. The casing 11 is formed in a box shape having a space in which water can be stored. The upper surface of the housing 11 is formed of a material that transmits sunlight (for example, glass). The side surface of the housing 11 is covered with a heat insulating material. The bottom surface of the housing 11 is formed of a material having high thermal conductivity (for example, stainless steel). A supply pipe 11 a and a discharge pipe 11 b are connected to the housing 11.

  Water is supplied from the outside into the housing 11 through the supply pipe 11a. Further, hydrogen and oxygen generated by the artificial photosynthesis are discharged from the inside of the housing 11 to the outside through the discharge pipe 11b. Hydrogen and oxygen discharged from the discharge pipe 11b can be used as an energy source (fuel etc.). When water is decomposed by artificial photosynthesis, new water is supplied from the supply pipe 11a by the amount of the decomposed water.

  The catalyst accommodated in the housing 11 is a substance that receives sunlight and decomposes water (photocatalyst). The catalyst can decompose water stored in the housing 11 to generate hydrogen and oxygen. In the present embodiment, a biocatalyst (for example, photosystem 2 • hydrogenase) is used as the catalyst.

  The first heat exchange device 20 performs heat exchange with the artificial photosynthesis device 10. The first heat exchange device 20 is formed in a rectangular parallelepiped shape (substantially flat plate shape). The first heat exchange device 20 is arranged so as to be in contact with the entire bottom surface of the housing 11 of the artificial photosynthesis device 10. A surface around the first heat exchange device 20 (a surface other than a surface in contact with the artificial photosynthesis device 10) is covered with a heat insulating material. In the first heat exchange device 20, a metal pipe (not shown) through which the antifreeze liquid can flow is provided. The first heat exchange device 20 has a higher temperature among the housing 11 of the artificial photosynthesis device 10 (more specifically, water in the housing 11) or the antifreeze liquid flowing through the first heat exchange device 20. Heat can be moved to a lower position.

  The heat storage device 30 stores heat by storing a heat medium (in the present embodiment, water (hot water)). The heat storage device 30 mainly includes a heat storage tank 31 and a second heat exchange device 32.

  The heat storage tank 31 is formed in a box shape having a space in which water (hot water) can be stored. The heat storage tank 31 can store heat by storing warm water (hot water). A supply pipe 31 a and a discharge pipe 31 b are connected to the heat storage tank 31.

  Water (clean water) is supplied from the outside into the heat storage tank 31 through the supply pipe 31a. Further, in response to a request from an external hot water supply demand (for example, a bathroom in a house), warmed water (hot water) in the heat storage tank 31 is supplied to the hot water supply demand through the discharge pipe 31b.

  The second heat exchange device 32 performs heat exchange with the heat storage tank 31. The second heat exchange device 32 is provided inside the heat storage tank 31. A pipe (not shown) through which the antifreeze liquid can flow is provided in the second heat exchange device 32. The second heat exchange device 32 can move heat from the higher temperature to the lower temperature of the water (hot water) in the heat storage tank 31 or the antifreeze liquid flowing through the second heat exchange device 32.

  The heat medium circulation device 40 circulates the heat medium between the first heat exchange device 20 and the heat storage tank 31. The heat medium circulation device 40 mainly includes an outgoing line 41, a return line 42, and a pump 43.

  The outgoing line 41 communicates the first heat exchange device 20 and the second heat exchange device 32. The periphery of the outgoing line 41 is covered with a heat insulating material. One end of the outgoing line 41 is connected to the second heat exchange device 32 (more specifically, one end of a pipe provided in the second heat exchange device 32). The other end of the outgoing line 41 is connected to the first heat exchange device 20 (more specifically, one end of a pipe provided in the first heat exchange device 20).

  The return line 42 communicates the first heat exchange device 20 and the second heat exchange device 32 via a route different from the forward route 41. The periphery of the return pipe 42 is covered with a heat insulating material. One end of the outgoing line 41 is connected to the first heat exchange device 20 (more specifically, the other end of the pipe provided in the first heat exchange device 20). The other end of the outgoing line 41 is connected to the second heat exchange device 32 (more specifically, the other end of the pipe provided in the second heat exchange device 32).

  The pump 43 is for pumping the antifreeze liquid. The pump 43 is provided in the middle part of the outgoing line 41. By driving the pump 43, the antifreeze liquid in the forward line 41 can be pumped and circulated in the order of the forward line 41, the first heat exchange device 20, the return line 42, and the second heat exchange device 32. .

  The first temperature sensor 50 is for detecting the temperature of the artificial photosynthesis apparatus 10. The first temperature sensor 50 is provided in the housing 11 of the artificial photosynthesis device 10. The first temperature sensor 50 can detect the temperature of the artificial photosynthesis device 10 (more specifically, water stored in the housing 11).

  The second temperature sensor 60 is for detecting the temperature of the heat storage device 30. The second temperature sensor 60 is provided in the heat storage tank 31. The second temperature sensor 60 can detect the temperature of the heat storage device 30 (more specifically, water (hot water) stored in the heat storage tank 31).

  The control device 70 controls the operation of the solar energy utilization system 1. The control device 70 is mainly composed of an arithmetic processing device such as a CPU, a storage device such as a RAM and a ROM, an input / output device such as an I / O, and a display device such as a monitor. Various information, programs, and the like for controlling the operation of the solar energy utilization system 1 are stored in the control device 70 in advance.

The control device 70 is connected to the first temperature sensor 50 and can receive a signal related to the temperature of the artificial photosynthesis device 10.
The control device 70 is connected to the second temperature sensor 60 and can receive a signal related to the temperature of the heat storage tank 31.
The control device 70 is connected to the pump 43 and can control the operation of the pump 43.

  Below, basic operation | movement of the solar energy utilization system 1 comprised as mentioned above is demonstrated.

  In the solar energy utilization system 1, when sunlight is irradiated on the casing 11 of the artificial photosynthesis apparatus 10, artificial photosynthesis (decomposition of water) is performed by the catalyst in the casing 11. Water supplied into the housing 11 via the supply pipe 10 a is decomposed into hydrogen and oxygen by the catalyst in the housing 11. The hydrogen and oxygen are discharged through the discharge pipe 11b. The hydrogen and oxygen can be used as an energy source.

  Further, when the pump 43 is driven by the control device 70, the antifreeze liquid is circulated in the order of the forward line 41, the first heat exchange device 20, the return line 42, and the second heat exchange device 32.

  At this time, if the temperature of the artificial photosynthesis device 10 (the temperature of the water in the housing 11) is higher than the temperature of the heat storage device 30 (the temperature of the water (hot water) in the heat storage tank 31), the artificial photosynthesis device 10 Heat (solar heat) moves to the heat storage tank 31 via the antifreeze. Thereby, water (hot water) in the heat storage tank 31 is warmed, and solar heat can be stored in the heat storage tank 31. The warmed water (hot water) can be supplied to the hot water supply demand through the discharge pipe 31b. In this way, solar heat can be utilized in hot water supply demand.

  On the other hand, when the temperature of the artificial photosynthesis device 10 is lower than the temperature of the heat storage device 30, the heat of the heat storage device 30 moves to the artificial photosynthesis device 10 via the antifreeze liquid. Thereby, the artificial photosynthesis apparatus 10 is warmed. In this case, the heat storage device 30 is a heat source (heat source) supplied to the artificial photosynthesis device 10.

  Here, the characteristics of the biocatalyst used in the artificial photosynthesis apparatus 10 will be described.

  As shown in FIG. 2, the organic biocatalyst has a temperature region in which the reaction rate (rate for decomposing water) is relatively high. Specifically, in the example shown in FIG. 2, the temperature (artificial photosynthesis device temperature) Tp of the artificial photosynthesis device 10 (water in the casing 11) is between T1 and T2 (T1 <T2), and the catalyst The reaction rate is increased. Therefore, the conversion efficiency of solar energy can be improved by adjusting the artificial photosynthetic apparatus temperature Tp to a value between T1 and T2.

  For example, in the early morning or winter, the artificial photosynthetic apparatus temperature Tp is low, so it is desirable to warm the artificial photosynthesizer 10. In addition, during the daytime (daytime), the artificial light synthesizer 10 is warmed by sunlight and the artificial light synthesizer temperature Tp increases, so it is desirable to lower the temperature of the artificial light synthesizer 10.

  From the above, in the solar energy utilization system 1 according to the present embodiment, the control device 70 performs control for adjusting the artificial photosynthesis device temperature Tp. Below, the control by the said control apparatus 70 is demonstrated concretely.

  Control by the control device 70 is roughly classified into four types of control. Specifically, the control by the control device 70 includes preheat time determination control (from step S101 to step S104 in FIG. 3), preheat execution control (from step S201 to step S204 in FIG. 4), and temperature increase control (in FIG. 4). Step S401 to Step S403) and heat collection control (Step S501 to Step S503 in FIG. 4).

  Here, “preheat” refers to the artificial photosynthesis before the artificial photosynthesis device 10 can receive sunlight (for example, at the time of sunrise, when the weather changes from cloudy or rainy). This means that the temperature of the apparatus 10 is raised in advance.

The control device 70 performs the preheat time determination control (control shown in FIG. 3) every predetermined time. In this embodiment, the control apparatus 70 shall perform the said control every hour from midnight. That is, the control device 70 performs the preheat time determination control at each time of 0:00 am, 1:00 am, 2:00 am, and so on. Hereinafter, each time when the control device 70 performs the preheat time determination control is simply referred to as “control time”.
On the other hand, the control device 70 performs the preheat execution control, the temperature increase control, and the heat collection control (control shown in FIG. 4) as needed not only at the control time.

  In principle, the controller 70 performs adjustment so that the artificial photosynthetic apparatus temperature Tp is a value between T1 and T2 (that is, a temperature at which the reaction rate of the catalyst is relatively high). Therefore, in the initial state, the control device 70 sets T1 as the target lower limit temperature TL (the lower limit value of the target artificial photosynthesis device temperature Tp) and T2 as the target upper limit temperature TH (the upper limit value of the target artificial photosynthesis device temperature Tp). Set each. In addition, since the values of T1 and T2 are determined by the catalyst, the values of the target lower limit temperature TL and the target upper limit temperature TH are also appropriately determined according to the catalyst.

  First, the preheat time determination control by the control apparatus 70 is demonstrated using FIG. When the current time becomes the control time (for example, midnight), the control device 70 starts the preheat time determination control.

In step S101, the control device 70 determines whether or not the heat source temperature TS is lower than the target lower limit temperature TL.
Here, “heat source temperature TS” means the temperature of the heat storage device 30.
When it is determined that the heat source temperature TS is lower than the target lower limit temperature TL, the control device 70 proceeds to step S102.
When it is determined that the heat source temperature TS is equal to or higher than the target lower limit temperature TL, the control device 70 proceeds to step S103.

In step S102, the control device 70 substitutes the heat source temperature TS as the value of the target lower limit temperature TL. That is, the control device 70 uses the value of the heat source temperature TS instead of T1 as the target lower limit temperature TL.
After performing the process of step S102, the control device 70 proceeds to step S103.

In step S103, the control device 70 calculates a heat amount (necessary heat amount) QN that needs to be supplied to the artificial photosynthesis device 10 in order to increase the artificial photosynthesis device temperature Tp to the target lower limit temperature TL.
The required heat quantity QN can be calculated using a mathematical formula of “necessary heat quantity QN = (target lower limit temperature TL−artificial photosynthesis apparatus temperature Tp) × artificial photosynthesis apparatus water quantity V × specific heat C”.

Here, the “artificial photosynthesis device water amount V” is the total amount of water in the artificial photosynthesis device 10 (housing 11).
The “specific heat C” is the specific heat of water in the artificial photosynthesis apparatus 10.
The values of the artificial photosynthesis device water volume V and specific heat C are known in advance from the configuration of the solar energy utilization system 1 and are stored in the control device 70.

  After performing the process of step S103, the control device 70 proceeds to step S104.

In step S104, the control device 70 calculates a time (supply start time) HP at which supply of heat to the artificial photosynthesis device 10 is started.
The supply start time HP can be calculated using a formula of “supply start time HP = light reception start time HS−required time WN”.

  Here, the “light reception start time HS” is a time at which the artificial light combining device 10 is predicted to be able to receive sunlight. In this embodiment, the light reception start time HS is the sunrise time (scheduled sunshine time), and is the time when the artificial light synthesizer 10 starts to be irradiated with sunlight. The estimated sunshine time (for example, a predicted sunrise time) is stored in the control device 70 in advance.

  The “necessary time WN” is the time required to supply the necessary heat quantity QN from the heat storage device 30 to the artificial photosynthesis device 10. The required time WN can be calculated by using the following formula: “Required Time WN = Required Heat Quantity QN / (Heat Source Temperature TS−Artificial Photosynthesis Device Temperature Tp) / Flow Rate R / Specific Heat C”.

  Here, the “flow rate R” is the flow rate of the antifreeze liquid pumped by the pump 43.

  After performing the process of step S104, the control device 70 proceeds to step S201 (see FIG. 4).

  Next, preheating execution control by the control device 70 will be described with reference to FIG.

In step S201 transferred from step S104, the control device 70 determines whether or not the current time is included in the preheat time zone.
Here, the “preheat time zone” specifically refers to a time at which the artificial photosynthesis device 10 cannot receive sunlight (in this embodiment, from sunset time to sunrise time). This is the time period from the supply start time HP to the light reception start time HS. That is, the control device 70 determines whether or not the time from the current time to the light reception start time HS is less than the necessary time WN (see step S104). The sunset time is stored in the control device 70 in advance.
When it is determined that the current time is included in the preheat time zone, the control device 70 proceeds to step S202.
When it is determined that the current time is not included in the preheat time zone, the control device 70 proceeds to step S301.

In step S202, the control device 70 determines whether or not the artificial photosynthesis device temperature Tp is lower than the target lower limit temperature TL.
When the control device 70 determines that the artificial photosynthetic device temperature Tp is lower than the target lower limit temperature TL, the control device 70 proceeds to step S203.
When determining that the artificial photosynthetic apparatus temperature Tp is equal to or higher than the target lower limit temperature TL, the control device 70 proceeds to step S601.

In step S203, the control device 70 determines whether or not the artificial photosynthesis device temperature Tp is lower than the heat source temperature TS.
When the control device 70 determines that the artificial photosynthesis device temperature Tp is lower than the heat source temperature TS, the control device 70 proceeds to step S204.
When the control device 70 determines that the artificial photosynthetic device temperature Tp is equal to or higher than the heat source temperature TS, the control device 70 proceeds to step S601.

  In step S <b> 204, the control device 70 drives the pump 43 to supply the heat of the heat storage device 30 to the artificial photosynthesis device 10. This will be specifically described below.

  When the pump 43 is driven, the antifreeze liquid circulates in the order of the outgoing pipe 41, the first heat exchange device 20, the return pipe 42, and the second heat exchange device 32. At this time, since the artificial photosynthesis device temperature Tp is lower than the heat source temperature TS (see step S203), the heat of the heat storage device 30 is supplied to the first heat exchange device 20 via the antifreeze liquid, and further, the first heat exchange device. 20 to the artificial photosynthesis apparatus 10.

  After performing the processing of step S204, the control device 70 proceeds to step S601.

In step S301 transferred from step S201, the control device 70 determines whether or not the current time is included in the time zone from the sunrise time (light reception start time HS) to the sunset time. That is, the control device 70 determines whether or not the current time is a time during which the artificial photosynthesis device 10 can receive sunlight.
When it is determined that the current time is included in the time zone from the sunrise time to the sunset time, the control device 70 proceeds to step S401.
When the control device 70 determines that the current time is not included in the time zone from the sunrise time to the sunset time, the control device 70 proceeds to step S601.

  Next, temperature increase control by the control device 70 will be described.

In step S401, the control device 70 determines whether or not the artificial photosynthesis device temperature Tp is lower than the target lower limit temperature TL.
When determining that the artificial photosynthetic apparatus temperature Tp is lower than the target lower limit temperature TL, the control device 70 proceeds to step S402.
When the control device 70 determines that the artificial photosynthetic device temperature Tp is equal to or higher than the target lower limit temperature TL, the control device 70 proceeds to step S501.

In step S402, the control device 70 determines whether or not the artificial photosynthesis device temperature Tp is lower than the heat source temperature TS.
When the control device 70 determines that the artificial photosynthesis device temperature Tp is lower than the heat source temperature TS, the control device 70 proceeds to step S403.
When the control device 70 determines that the artificial photosynthetic device temperature Tp is equal to or higher than the heat source temperature TS, the control device 70 proceeds to step S601.

  In step S <b> 403, the control device 70 drives the pump 43 to supply the heat of the heat storage device 30 to the artificial photosynthesis device 10. This will be specifically described below.

  When the pump 43 is driven, the antifreeze liquid circulates in the order of the outgoing pipe 41, the first heat exchange device 20, the return pipe 42, and the second heat exchange device 32. At this time, since the artificial photosynthetic apparatus temperature Tp is lower than the heat source temperature TS (see step S401), the heat of the heat storage device 30 is supplied to the first heat exchange device 20 via the antifreeze liquid, and further, the first heat exchange device. 20 to the artificial photosynthesis apparatus 10.

  After performing the process of step S403, the control device 70 proceeds to step S601.

  Next, heat collection control by the control device 70 will be described.

In step S501 transferred from step S401, the control device 70 determines whether or not the artificial photosynthesis device temperature Tp is higher than the target upper limit temperature TH.
If the controller 70 determines that the artificial photosynthetic apparatus temperature Tp is higher than the target upper limit temperature TH, the controller 70 proceeds to step S502.
When determining that the artificial photosynthetic apparatus temperature Tp is equal to or lower than the target upper limit temperature TH, the control apparatus 70 proceeds to step S601.

In step S502, the control device 70 determines whether or not the artificial photosynthesis device temperature Tp is higher than the heat source temperature TS.
If the controller 70 determines that the artificial photosynthetic apparatus temperature Tp is higher than the heat source temperature TS, the controller 70 proceeds to step S503.
When the control device 70 determines that the artificial photosynthetic device temperature Tp is equal to or lower than the heat source temperature TS, the control device 70 proceeds to step S601.

  In step S <b> 503, the control device 70 drives the pump 43 to supply the heat of the artificial photosynthesis device 10 to the heat storage device 30. This will be specifically described below.

  When the pump 43 is driven, the antifreeze liquid circulates in the order of the outgoing pipe 41, the first heat exchange device 20, the return pipe 42, and the second heat exchange device 32. At this time, since the artificial photosynthesis device temperature Tp is higher than the heat source temperature TS (see step S502), the heat of the artificial photosynthesis device 10 is supplied to the first heat exchange device 20, and the antifreeze liquid is further supplied from the first heat exchange device 20. Is supplied to the heat storage device 30.

  After performing the process of step S503, the control device 70 proceeds to step S601.

In step S601, the control device 70 determines whether or not the current time has reached the next control time.
When it is determined that the current time has reached the next control time, the control device 70 proceeds to step S101.
When determining that the current time has not reached the next control time, the control device 70 proceeds to step S201.
For example, when the control device 70 starts the preheat time determination control (see FIG. 3) at midnight, the control device 70 moves from step S601 to step S201 until 1:00 am, and performs preheat execution control, temperature increase control, and heat collection. The control is repeated, and at 1 am, the control device 70 proceeds from step S601 to step S101 (see FIG. 3).

  Thus, in the preheat time determination control, the control device 70 calculates the necessary heat amount QN from the target lower limit temperature TL and the artificial photosynthetic device temperature Tp (step S103), and calculates the supply start time HP using the necessary heat amount QN. (Step S104). By starting preheating (supply of heat to the artificial photosynthesis device 10) from the supply start time HP calculated in this way, the temperature of the artificial photosynthesis device 10 is increased to the target lower limit temperature TL or more before the light reception start time HS is reached. Can be raised.

  At this time, if the heat source temperature TS is lower than the target lower limit temperature TL (step S101), the control device 70 uses the heat source temperature TS as the value of the target lower limit temperature TL (step S102). As described above, when the heat source temperature TS is lower than the target lower limit temperature TL, the artificial photosynthetic apparatus temperature Tp can be raised only up to the heat source temperature TS even at the maximum, so the control device 70 sets the heat source temperature TS as the target lower limit temperature TL. The value of is used.

  Further, in the preheat execution control, the control device 70 includes the current time in the preheat time zone (step S201), and the artificial photosynthesizer temperature Tp is lower than the target lower limit temperature TL and lower than the heat source temperature TS (step S202). And step S203) and the heat | fever of the thermal storage apparatus 30 are supplied to the artificial photosynthesis apparatus 10 (step S204).

  In this way, the control device 70 supplies the heat of the heat storage device 30 to the artificial photosynthesis device 10 in the preheat time period, so that the artificial photosynthesis device temperature Tp is set to the target lower limit in accordance with the timing of the light reception start time HS. The temperature can be raised to TL. As a result, the artificial light synthesizing apparatus 10 can efficiently perform artificial photosynthesis from the point of time when the light reception start time HS is reached, thereby improving the conversion efficiency of solar energy.

  In addition, the control device 70 performs temperature rise control or heat collection control as appropriate in the time zone from sunrise to sunset (step S301).

  Specifically, in the temperature rise control, the controller 70 performs artificial photosynthesis on the heat of the heat storage device 30 when the artificial photosynthetic device temperature Tp is lower than the target lower limit temperature TL and lower than the heat source temperature TS (step S401 and step S402). It supplies to the apparatus 10 (step S403).

  As described above, the control device 70 can increase the artificial photosynthetic device temperature Tp when the artificial photosynthetic device temperature Tp is low in the time zone from sunrise to sunset. As a result, the artificial photosynthesis apparatus 10 can efficiently perform artificial photosynthesis, and consequently, the conversion efficiency of solar energy can be improved.

  In addition, in the heat collection control, the control device 70 transfers the heat of the artificial photosynthesis device 10 to the heat storage device 30 when the artificial photosynthesis device temperature Tp is equal to or higher than the target upper limit temperature TH and the heat source temperature TS (step S501 and step S502). Supply (step S503).

  As described above, in the time zone from sunrise to sunset, the control device 70 collects the heat (solar heat) of the artificial photosynthesis device 10 when it receives sunlight and the artificial photosynthesis device temperature Tp becomes high. By supplying to 30, the artificial photosynthetic apparatus temperature Tp can be lowered. As a result, the artificial photosynthesis apparatus 10 can efficiently perform artificial photosynthesis, and consequently, the conversion efficiency of solar energy can be improved.

  Moreover, the heat (solar heat) of the artificial photosynthesis apparatus 10 is stored in the heat storage device 30 (heat storage tank 31), and can be used for any purpose. Thus, since the surplus part of solar heat can be utilized, the conversion efficiency of solar energy can be further improved. Furthermore, since the solar heat stored in the heat storage device 30 in this way can be used as heat supplied to the artificial photosynthesis device 10 in the preheat execution control (see step S204), the solar energy conversion efficiency is further improved. Can be made.

  As described above, the solar energy utilization system 1 according to the present embodiment is the first heat exchange capable of heat exchange between the artificial photosynthesis apparatus 10 having a catalyst that decomposes water by receiving sunlight and the artificial photosynthesis apparatus 10. Circulating the antifreeze liquid (heat medium) between the device 20 (heat exchange device), the heat storage device 30 that stores heat by storing water (heat medium), and the first heat exchange device 20 and the heat storage device 30. And a heat medium circulating device 40 for transferring heat.

By comprising in this way, the conversion efficiency of solar energy can be improved.
In other words, the temperature of the artificial photosynthesis device 10 (artificial photosynthesis device temperature Tp) can be adjusted by circulating the antifreeze liquid between the first heat exchange device 20 and the heat storage device 30. The solar energy conversion efficiency can be improved by adjusting the artificial photosynthetic apparatus temperature Tp to a temperature range in which the reaction rate of the catalyst increases. Moreover, the heat | fever of the artificial photosynthesis apparatus 10 can be stored in the thermal storage apparatus 30, and the conversion efficiency of solar energy can be improved more by using the said heat | fever for the arbitrary purposes.

  The solar energy utilization system 1 also includes a first temperature sensor 50 (first temperature detection means) that detects an artificial photosynthesis device temperature Tp (temperature of the artificial photosynthesis device 10) and a heat source temperature TS (temperature of the heat storage device 30). When the detected second temperature sensor 60 (second temperature detection means), the artificial photosynthetic device temperature Tp is lower than the target lower limit temperature TL (first target temperature), and the artificial photosynthesizer temperature Tp is lower than the heat source temperature TS In addition, the heat medium circulation device 40 circulates the heat medium between the first heat exchange device 20 and the heat storage device 30, thereby transferring the heat of the heat storage device 30 to the artificial photosynthesis device 10 and increasing the temperature. And a control device 70 that performs control (first control).

By comprising in this way, the conversion efficiency of solar energy can be improved.
That is, when the artificial photosynthesis device temperature Tp is lower than the target lower limit temperature TL, the heat of the heat storage device 30 can be transmitted to the artificial photosynthesis device 10 to increase the artificial photosynthesis device temperature Tp. At this time, by setting the value of the target lower limit temperature TL in the vicinity of the lower limit value of the temperature range in which the reaction rate of the catalyst becomes high, the reaction rate of the catalyst can be increased, and consequently the conversion efficiency of solar energy is improved. be able to.

  Further, the solar energy utilization system 1 includes a first temperature sensor 50 that detects an artificial photosynthesis device temperature Tp, a second temperature sensor 60 that detects a heat source temperature TS, and an artificial photosynthesis device temperature Tp that is a target upper limit temperature TH (second When the artificial photosynthesis device temperature Tp is higher than the heat source temperature TS, the heat medium circulation device 40 causes the heat medium to circulate between the first heat exchange device 20 and the heat storage device 30 when the temperature is higher than the target temperature). And a control device 70 that performs heat collection control (second control) for transferring the heat of the photosynthetic device 10 to the heat storage device 30.

By comprising in this way, the conversion efficiency of solar energy can be improved.
That is, when the artificial photosynthesis device temperature Tp is higher than the target upper limit temperature TH, the heat of the artificial photosynthesis device 10 can be transmitted to the heat storage device 30, and the artificial photosynthesis device temperature Tp can be lowered. At this time, by setting the value of the target upper limit temperature TH in the vicinity of the upper limit value of the temperature range in which the reaction rate of the catalyst becomes high, the reaction rate of the catalyst can be increased, and as a result, the conversion efficiency of solar energy is improved. be able to. Moreover, the heat transmitted to the heat storage device 30 can be used for any purpose, and the conversion efficiency of solar energy can be further improved.

  In the solar energy utilization system 1, the first temperature sensor 50 that detects the artificial photosynthesis device temperature Tp, the second temperature sensor 60 that detects the heat source temperature TS, and the artificial photosynthesis device temperature Tp are less than the target lower limit temperature TL. When the artificial photosynthetic device temperature Tp is lower than the heat source temperature TS, the heat medium circulating device 40 circulates the heat medium between the first heat exchange device 20 and the heat storage device 30 to heat the heat storage device 30. The preheat execution control and the temperature rise control are transmitted to the artificial photosynthesis device 10, the artificial photosynthesis device temperature Tp is higher than the target upper limit temperature TH set to a value higher than the target lower limit temperature TL, and the artificial photosynthesis device temperature. When Tp is higher than the heat source temperature TS, the heat medium circulation device 40 circulates the heat medium between the first heat exchange device 20 and the heat storage device 30. And a control unit 70 for performing heat collection control to transfer heat of the artificial photosynthetic apparatus 10 to the heat accumulator 30, in which further comprising a.

By comprising in this way, the conversion efficiency of solar energy can be improved.
That is, the artificial photosynthetic apparatus temperature Tp can be adjusted to be equal to or higher than the target lower limit temperature TL and lower than the target upper limit temperature TH. At this time, the reaction rate of the catalyst can be increased by setting the values of the target lower limit temperature TL and the target upper limit temperature TH in the vicinity of the lower limit value and the upper limit value in the temperature region where the reaction rate of the catalyst is increased, As a result, the conversion efficiency of solar energy can be improved. Moreover, the heat transmitted to the heat storage device 30 can be used for any purpose, and the conversion efficiency of solar energy can be further improved.

Further, when the control device 70 performs the first control at a time when the artificial light synthesizer 10 cannot receive sunlight (from sunset time to sunrise time), the artificial light synthesizer temperature Tp is set to the target lower limit. Calculate the necessary heat quantity QN necessary to reach the temperature TL, calculate the necessary time WN (required time) required to transmit the necessary heat quantity QN from the heat storage device 30 to the artificial photosynthesis device 10, and receive light from the current time. The preheat execution control is performed only when the time until the start time HS (the time when the artificial light synthesizing apparatus 10 is expected to receive sunlight) becomes equal to or shorter than the required time WN.

  With this configuration, the artificial photosynthetic apparatus temperature Tp can be raised to the target lower limit temperature TL in accordance with the light reception start time HS. Thereby, water can be efficiently decomposed from the time when the artificial photosynthesis apparatus 10 starts receiving sunlight.

  Further, when the target lower limit temperature TL is higher than the heat source temperature TS, the control device 70 uses the heat source temperature TS as the value of the target lower limit temperature TL.

  With this configuration, when the artificial photosynthesis device temperature Tp cannot be raised to the target lower limit temperature TL, the artificial photosynthesis device temperature Tp can be raised as much as possible (that is, to the heat source temperature TS). it can. Thereby, the conversion efficiency of solar energy can be improved as much as possible.

Further, the side surface of the housing 11 of the artificial photosynthesis device 10 and the periphery of the forward conduit 41 and the return conduit 42 of the heat medium circulation device 40 are covered with a heat insulating material.
By comprising in this way, the loss of heat can be suppressed and the suppression of the temperature drop of winter water, antifreeze, etc. can be aimed at.

  In the solar energy utilization system 1, a system (solar heat water system) is constructed in which solar heat is collected by the artificial photosynthesis device 10 and the first heat exchange device 20 and the solar heat is stored in the heat storage device 30. Thus, since the temperature of the artificial photosynthesis apparatus 10 can be adjusted using a simple solar hot water system, it is not necessary to use other special equipment, and cost can be reduced.

The first heat exchange device 20 is an embodiment of the heat exchange device according to the present invention.
Moreover, water (hot water) and antifreeze are one embodiment of the heat medium according to the present invention.
Moreover, the 1st temperature sensor 50 is one Embodiment of the 1st temperature detection means which concerns on this invention.
Moreover, the 2nd temperature sensor 60 is one Embodiment of a 2nd temperature detection means.
The target lower limit temperature TL is an embodiment of the first target temperature according to the present invention.
Further, the preheat execution control and the temperature rise control performed by the control device 70 are an embodiment of the first control according to the present invention.
The target upper limit temperature TH is an embodiment of the second target temperature according to the present invention.
The heat collection control performed by the control device 70 is an embodiment of the second control according to the present invention.
The required time WN is an embodiment of the required time according to the present invention.

  In the present embodiment, water (hot water) is exemplified as the heat medium stored by the heat storage device 30 and the antifreeze liquid is exemplified as the heat medium circulated by the heat medium circulation device 40. However, the present invention is not limited thereto. It is not limited. That is, the heat medium is not limited as long as heat can be transmitted and stored.

  In the present embodiment, the second heat exchange device 32 performs heat exchange between the heat medium (water) of the heat storage device 30 and the heat medium (antifreeze liquid) of the heat medium circulation device 40. The invention is not limited to this. For example, the heat medium circulation device 40 may be configured not to use the second heat exchange device 32. In this case, the outgoing pipe 41 and the return pipe 42 are directly connected to the heat storage device 30 (heat storage tank 31), and the heat medium (water) of the heat storage device 30 is circulated between the first heat exchange device 20 and the heat storage device 30. .

  In the present embodiment, the artificial photosynthesis apparatus 10 is supplied with water from the outside, and the water is decomposed. However, the water supplied to the artificial photosynthesis apparatus 10 may be not only pure water but also a liquid (aqueous solution) in which some substance is dissolved in water.

  In the present embodiment, T1 is set as the target lower limit temperature TL and T2 is set as the target upper limit temperature TH, but the present invention is not limited to this. That is, the target lower limit temperature TL and the target upper limit temperature TH can be arbitrarily set. For example, by setting the target lower limit temperature TL to a temperature slightly higher than T1 and the target upper limit temperature TH to a temperature slightly lower than T2, the temperature range in which the artificial photosynthesis apparatus temperature Tp is more reliably increased in the reaction rate of the catalyst. Can be adjusted in. In order to increase the reaction rate of the catalyst, it is desirable that the target lower limit temperature TL and the target upper limit temperature TH are set near the lower limit value and the upper limit value in the temperature region where the reaction rate of the catalyst increases.

  In the present embodiment, the preheat time determination control (see FIG. 3) is performed at each control time (in this embodiment, every hour from midnight), but the present invention is not limited to this. is not. For example, the preheat time determination control may not be performed every time at each control time, but may be configured to be performed only once or several times at a determined time of the day.

  In the present embodiment, the time at which the artificial light synthesizing apparatus 10 can receive sunlight (light reception start time HS) has been described as meaning the time of sunrise. It is not limited to. For example, even if the artificial photosynthesis apparatus 10 receives sunlight, the catalyst may not be able to perform sufficient artificial photosynthesis if the amount of solar radiation is small. Therefore, the time when the amount of solar radiation applied to the artificial light synthesizer 10 becomes equal to or greater than a predetermined value may be set as the light reception start time HS. With this configuration, artificial photosynthesis can be performed efficiently even on days with particularly bad weather (such as cloudy days).

  Moreover, it is also possible to perform control by the control device 70 using the time when the weather changes from cloudy or rainy as the light reception start time HS. The light reception start time HS in this case can be determined based on a weather forecast or the like.

  In the present embodiment, the light reception start time HS is stored in the control device 70 in advance, but the present invention is not limited to this. For example, the control device 70 may be configured to always obtain the latest light reception start time HS (predicted sunrise time, weather forecast, etc.) via the Internet or the like. Further, it is possible to learn the latest light reception start time HS using an illuminometer or the like, and the control device 70 itself predicts the light reception start time HS of the day based on the learning result.

  In this embodiment, an example (see FIG. 2) in which the reaction rate is substantially constant in a predetermined temperature range (between T1 and T2) is shown as the characteristic of the organic biocatalyst. The characteristics are not limited to the example of FIG. For example, it may be a biocatalyst having a characteristic that the reaction rate becomes maximum (peak) at a predetermined temperature. In this case, it is desirable to set the values of the target lower limit temperature TL and the target upper limit temperature TH so that the temperature at which the reaction rate is maximum is included between the target lower limit temperature TL and the target upper limit temperature TH.

  In the present embodiment, an organic biocatalyst is used as the catalyst provided in the artificial photosynthesis apparatus 10, but the present invention is not limited to this. That is, the present invention does not limit the type of catalyst, and other organic catalysts (for example, porphyrin / fullerene) and inorganic catalysts (for example, sodium tantalate) can be used. .

  Moreover, the structure of the heat storage apparatus which concerns on this invention is not restricted to the heat storage apparatus 30 demonstrated in this embodiment. For example, as the heat storage device 30, a tank that stores the exhaust heat of the fuel cell can be used. With this configuration, the exhaust heat of the fuel cell can be supplied to the artificial photosynthesis device 10 to increase the artificial photosynthesis device temperature Tp. Thus, it is possible to make it the structure which stores heat other than a solar heat in a thermal storage apparatus.

  In the present embodiment, the heat from the heat storage device 30 is supplied to the artificial photosynthesis device 10 in the preheat execution control and the temperature rise control performed by the control device 70 (steps S204 and S403 in FIG. 4). The present invention is not limited to this. For example, in addition to the heat storage device 30 (or in place of the heat storage device 30), heat from another heat source (for example, a gas water heater) may be supplied to the artificial photosynthesis device 10.

  Further, in the present embodiment, in the heat collection control performed by the control device 70, the heat from the artificial photosynthesis device 10 is supplied to the heat storage device 30 (see step S503 in FIG. 4). It is not limited to. For example, a configuration in which heat from the artificial photosynthesis device 10 is supplied to a heat dissipation device (for example, a radiator or the like) in addition to the heat storage device 30 (or in place of the heat storage device 30) is also possible.

  In the present embodiment, the artificial photosynthesis device 10 (housing 11) and the first heat exchange device 20 are formed in a rectangular parallelepiped shape (substantially flat plate shape), but the artificial photosynthesis device according to the present invention and The heat exchange device is not limited to this, and can be formed in an arbitrary shape. Below, the modification of the artificial photosynthesis apparatus 10 and the 1st heat exchange apparatus 20 is demonstrated.

  FIG. 5A shows an artificial photosynthesis device 110 and a first heat exchange device 120 according to a first modification of the artificial photosynthesis device 10 and the first heat exchange device 20. The casing 111 of the artificial photosynthesis apparatus 110 is formed in a substantially cylindrical shape with an open center part of a column. The first heat exchange device 120 is formed in a cylindrical shape and is fitted inside the casing 111 (center portion). Heat exchange can be performed between the artificial photosynthesis apparatus 110 configured as described above and the first heat exchange apparatus 120.

  In addition, it is also possible to form the artificial photosynthesis apparatus 110 and the first heat exchange apparatus 120 according to the first modification so that the shapes thereof are reversed. In other words, the first heat exchange device 120 may be formed in a substantially cylindrical shape, and the artificial photosynthesis device 110 formed in a columnar shape may be fitted inside the first heat exchange device 120.

FIG. 5B shows an artificial photosynthesis device 210 and a first heat exchange device 220 according to a second modification of the artificial photosynthesis device 10 and the first heat exchange device 20. The casing 211 of the artificial photosynthesis device 210 is formed in a shape (substantially bellows) in which a plate-like member is alternately subjected to mountain folds and valley folds. Moreover, the 1st heat exchange apparatus 220 is formed with piping. The first heat exchange device 220 is arranged in a state of penetrating the casing 211 so as to alternately pass through the front surface and the back surface of the casing 211. Heat exchange can be performed between the artificial photosynthesis apparatus 210 configured as described above and the first heat exchange apparatus 220.

  FIG. 5C shows an artificial photosynthesis device 310 and a first heat exchange device 320 according to a third modification of the artificial photosynthesis device 10 and the first heat exchange device 20. The housing 311 of the artificial photosynthesis device 310 is formed in a columnar shape (tubular shape). Moreover, the 1st heat exchange apparatus 320 is formed with piping. The first heat exchange device 320 is arranged in a state of being wound around the outer periphery of the housing 311. Heat exchange can be performed between the artificial photosynthesis device 310 configured as described above and the first heat exchange device 320.

1 Solar Energy Utilization System 10 Artificial Photosynthesis Device 20 First Heat Exchanger (Heat Exchanger)
30 heat storage device 40 heat medium circulation device 50 first temperature sensor (first temperature detection means)
60 Second temperature sensor (second temperature detection means)
70 Controller

Claims (5)

An artificial photosynthesis device having a catalyst that decomposes water by receiving sunlight; and
A heat exchange device capable of exchanging heat with the artificial photosynthesis device;
A heat storage device that stores heat by storing a heat medium;
A heat medium circulation device that transfers heat by circulating a heat medium between the heat exchange device and the heat storage device;
First temperature detecting means for detecting the temperature of the artificial photosynthesis device;
Second temperature detecting means for detecting the temperature of the heat storage device;
When the temperature of the artificial photosynthesis device is lower than a first target temperature and the temperature of the artificial photosynthesis device is lower than the temperature of the heat storage device, the heat exchange device and the heat storage device A control device for performing a first control for transferring heat of the heat storage device to the artificial photosynthetic device by circulating a heat medium between them;
Equipped with,
The controller is
When performing the first control at a time when the artificial photosynthesis device cannot receive sunlight,
Calculate the necessary amount of heat necessary for the temperature of the artificial photosynthesis device to reach the first target temperature,
Calculate the time required to transfer the necessary heat amount from the heat storage device to the artificial photosynthesis device,
The first control is performed only when the time from the current time to the time when the artificial light synthesizer is predicted to be able to receive sunlight is equal to or shorter than the required time.
Solar energy utilization system. The controller is
When the temperature of the artificial photosynthesis device is higher than a second target temperature and the temperature of the artificial photosynthesis device is higher than the temperature of the heat storage device, the heat medium circulation device causes the heat exchange device and the heat storage device to By circulating the heat medium, the second control of transferring the heat of the artificial photosynthesis device to the heat storage device is performed.
Solar energy utilization system according to 請 Motomeko 1. The second target temperature is
Solar energy utilization system according to 請 Motomeko 2 is set to a value higher than the first target temperature. The controller is
When the first target temperature is higher than the temperature of the heat storage device, the temperature of the heat storage device is used as the value of the first target temperature.
Solar energy utilization system as claimed in any one of up to claim 3 請 Motomeko 1. An artificial photosynthesis device having a catalyst that decomposes water by receiving sunlight; and
A heat exchange device capable of exchanging heat with the artificial photosynthesis device;
A heat storage device that stores heat by storing a heat medium;
A heat medium circulation device that transfers heat by circulating a heat medium between the heat exchange device and the heat storage device;
First temperature detecting means for detecting the temperature of the artificial photosynthesis device;
Second temperature detecting means for detecting the temperature of the heat storage device;
When the temperature of the artificial photosynthesis device is lower than a first target temperature and the temperature of the artificial photosynthesis device is lower than the temperature of the heat storage device, the heat exchange device and the heat storage device A control device for performing a first control for transferring heat of the heat storage device to the artificial photosynthetic device by circulating a heat medium between them;
Comprising
The controller is
When the first target temperature is higher than the temperature of the heat storage device, the temperature of the heat storage device is used as the value of the first target temperature.
Solar energy utilization system.

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