JP5457818B2 - Cogeneration system - Google Patents

Description

  The present invention relates to a cogeneration system that supplies electricity and heat.

  Conventionally, when using a power generation device such as a fuel cell, for example, a cogeneration system has been proposed in which exhaust heat generated during power generation is recovered with a refrigerant so that the exhaust heat generated in the power generation device can be used for hot water supply or the like. Has been.

  If this type of cogeneration system is used, it is possible to use both the electric energy and the heat energy generated by the power generation device, so that the essential electric energy and heat energy are efficiently supplied to consumers such as houses. (For example, refer to Patent Document 1). The cogeneration system described in Patent Document 1 includes a hot water supply device having a hot water storage tank (water storage tank) for storing hot water, and heats hot water stored in the hot water storage tank by exhaust heat generated by the power generation device (fuel cell). The thermal energy generated by the power generator is used.

  Normally, in this type of cogeneration system, the power generator is not operated at all times, but is controlled to operate according to a time schedule (operation start time, operation time) determined based on past power consumption data. Is done. In general, the power consumption amount of the next day is predicted from the power consumption amount of the current day, and the power generation apparatus is operated so that the power generation amount corresponding to the predicted value is generated.

  However, even if it is operating according to the time schedule, if the amount of hot water in the hot water storage tank is saturated and the exhaust heat of the power generation device cannot be recovered any more, the power generation device automatically stops operation and wastes energy. Do not. Therefore, the power supply from the commercial power source is also performed in a time zone in which there is a power demand exceeding the power generation capacity of the power generation device or in a time zone in which the power generation device is not operating.

  By the way, in the above-mentioned cogeneration system, when a large amount of hot water is used in the time zone before the power generator starts operation, even if the amount of hot water in the hot water storage tank is small, the hot water in the hot water storage tank may be lost. In order to cope with such a case, measures have been taken to provide a backup heat source so that hot water can be supplied while being heated by the backup heat source. There is a problem that cannot be supplied.

  Therefore, a heating device for heating the hot water stored in the hot water storage tank is provided separately from the power generation device, and a certain amount of hot water is secured in the hot water storage tank in advance by the heating device before the power generation device is operated. It is conceivable to prevent disappearance.

Japanese Patent No. 4296741 (paragraphs 0015-0023)

  However, if a certain amount of hot water is secured in the hot water storage tank by the hot water heated by the heating device, then if the hot water in the hot water storage tank is hardly used, the operation of the power generator is started. Immediately, the amount of hot water in the hot water storage tank is saturated and the operation of the power generator stops. If this happens, the power generation device cannot be operated until the amount of hot water in the hot water storage tank is reduced, and there is a possibility that the required electrical energy will not be generated by the power generation device.

  The present invention has been made in view of the above-described reason, and is a cogeneration system capable of appropriately determining the amount of heat applied in advance by the heating device while being able to supply a sufficient amount of hot water before the start of operation of the power generation device. The purpose is to provide.

In the invention of claim 1, heating the hot water supply device for performing the hot water supply by hot water in the hot water storage tank having a hot water storage tank to accumulate hot water, the hot water which is accumulated in the hot water storage tank by utilizing the waste heat generated during power generation power comprising a device, a heating device for heating the hot water to be separately accumulated in the hot water storage tank and the power generator, and a controller for controlling the driving condition of the heating device and the power generator, the hot water storage tank, inside hot water in filled, the upper limit of the possible storage amount of heat in the limit the range of storable heat throughout the hot water is set, the control device, the heating value of the power generation device for each predetermined unit period prediction means for predicting for, and a preheating control means for operating the heating device before the power generation device in the unit period starts operation, the prediction unit, the unit period of the past Predicts the amount of power consumed in the unit period in the future based on the spent amount of power, and to predict the heating value of the power generation device based on the prediction, the preheating control means by said predicting means together with the amount of heat generated predicted the power generation device to secure the amount of heat required for the unit period, and as the amount of heat of the hot water storage tank during the unit period does not exceed the upper limit, the hot water from the heating device The control device predicts the amount of hot water consumed in the unit period in the future based on the amount of hot water consumed in the unit period in the past, and determines the amount of heat in the unit period based on the prediction. It has an adjustment means which changes the said upper limit so that the said upper limit of the said unit period may be enlarged, so that the amount of hot water consumed is increased .

  According to this configuration, a certain amount of hot water can be secured in the hot water storage tank in advance by the heating device before the power generation device starts operation in the unit period, so before the power generation device starts operation, Even if it exists, supply of sufficient amount of hot water becomes possible. In addition, the amount of heat applied in advance by the heating device is determined based on the amount of heat generated by the power generation device so as to ensure the amount of heat necessary for the unit period together with the amount of heat generated by the power generation device predicted by the prediction means. Therefore, it is possible to appropriately determine the amount of heat applied in advance by the heating device while allowing a sufficient amount of hot water to be supplied before starting the operation of the power generation device.

Further , according to this configuration, the amount of heat applied to the hot water from the heating device is determined so that the amount of heat in the hot water storage tank does not exceed the upper limit value during the unit period, so that the amount of heat generated in the heating device and the power generation device can be used efficiently. Can be used.

Further , according to this configuration, the adjustment means changes the upper limit value so that the upper limit value of the unit period is increased as the predicted amount of hot water consumption increases, so the amount of heat that can be accumulated in the hot water storage tank is increased. It becomes possible to adjust appropriately according to the amount of hot water consumed.

The invention of claim 2 is characterized in that, in the invention of claim 1 , the control device has a heating control means for operating the heating device when the amount of hot water in the hot water storage tank falls below a predetermined lower limit value.

  According to this configuration, even when the amount of hot water consumed is large, it is possible to avoid running out of hot water in the hot water storage tank by operating the heating device when the amount of hot water in the hot water storage tank falls below a predetermined lower limit value. it can.

The invention of claim 3 is characterized in that, in the invention of claim 1 or claim 2 , the predicting means predicts a heat generation amount of the power generation device with the unit period as a unit of one day.

  According to this configuration, since the heat generation amount of the power generation device is predicted in units of one day when the amount of consumed electric power and the amount of hot water are substantially stabilized, compared to the case where the unit period is, for example, one hour unit, The accuracy of heat generation prediction is increased.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the prediction means is predicted to acquire weather forecast data for the future unit period and to be consumed during the unit period. It has a correction function for correcting the amount of power using a correspondence relationship between preset weather forecast data and power consumption of a load.

  According to this configuration, since the weather forecast data is reflected in the prediction of the power consumption, for example, it becomes easy to predict the power consumption of the load whose power consumption changes due to the influence of the weather conditions such as the air conditioner. The accuracy of heat generation prediction is increased.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a solar cell is provided separately from the power generation device, and the prediction means stores weather forecast data for the future unit period. Obtaining and predicting the power generation amount of the solar cell in the unit period based on weather forecast data, and subtracting the power generation amount from the power amount predicted to be consumed in the unit period to obtain the power generation amount of the power generator It is characterized by.

  According to this configuration, since the weather forecast data is reflected in the prediction of the power generation amount of the solar cell, it becomes easy to predict the power generation amount of the solar cell whose power generation capacity changes due to the influence of weather conditions, and the heat generation amount of the power generation device is reduced. The accuracy of prediction is increased.

According to a sixth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a power generation device that generates power using natural energy is provided separately from the power generation device. The power generation amount of the power generation device is obtained by subtracting the power generation amount of the power generation device from the amount of power consumed during the unit period.

  According to this configuration, since the power generation amount of the power generation device is reflected in the power generation amount of the power generation device, the accuracy of prediction of the heat generation amount of the power generation device is increased. The natural energy here includes, for example, sunlight, solar heat, wind power, hydraulic power, biomass, snow and ice heat, and the like.

  The present invention has preheating control means in the control device that determines the amount of heat to be added to the hot water from the heating device so as to ensure the amount of heat necessary for the unit period together with the heat generation amount of the power generation device predicted by the prediction means. While it is possible to supply a sufficient amount of hot water before the start of operation of the apparatus, there is an advantage that the amount of heat applied in advance by the heating apparatus can be appropriately determined.

1 is a schematic system configuration diagram showing the configuration of Embodiment 1 of the present invention. It is explanatory drawing which shows the relationship of the electric power generation amount-heat generation amount of an electric power generating apparatus same as the above. It is a conceptual diagram for demonstrating operation | movement same as the above. It is a flowchart which shows operation | movement same as the above.

(Embodiment 1)
As shown in FIG. 1, the cogeneration system of the present embodiment has a hot water storage tank 10 for storing hot water and a hot water supply device 1 for supplying hot water using hot water in the hot water storage tank 10, and hot water storage using exhaust heat generated during power generation. And a power generator 2 for heating hot water stored in a tank 10. Further, the cogeneration system includes a heating device 3 that heats hot water stored in the hot water storage tank 10 and a control device 4 that controls the operating status of the heating device 3 and the power generation device 2, separately from the power generation device 2. .

  Here, the power generation apparatus 2 is mainly composed of a fuel cell 20, and is formed by steam reforming raw fuel such as city gas mainly composed of methane gas or the like with a reformer (not shown). Is generated, and the reformed gas is introduced into the fuel cell 20 to generate power. The power generation device 2 in the present embodiment generates exhaust heat in the fuel cell 20 and the reformer during power generation. The exhaust heat is recovered by the refrigerant and used for heating hot water in the exhaust heat exchanging unit 21 provided in the power generation device 2. The power generation amount and the heat generation amount in the power generation device 2 have a correspondence relationship illustrated in FIG. However, the power generator 2 only needs to have a configuration capable of recovering exhaust heat generated during power generation, and is not limited to the fuel cell 20 and may be configured mainly by, for example, a gas engine.

The heating device 3 is installed outside the house and includes a heat pump type heating device 3. Here, the hot water storage tank 10 has a water supply port 11 connected to a water supply or the like for supplying low temperature water to the inside thereof, and is connected to a hot water supply pipe for hot water supply and discharge port for discharging high temperature hot water. 12 at the top. Hot water in the hot water storage tank 10 is transported from the bottom of the hot water storage tank 10 to the heat exchanger 30 in the heating device 3 through the forward line 13, and is returned to the hot water storage tank 10 from the upper part of the hot water storage tank 10 through the return line 14. . In the heating device 3, heat in the atmosphere is collected in a natural refrigerant (for example, CO ₂ ), the natural refrigerant is compressed by a compressor to a high temperature, and then the heat of the natural refrigerant is transmitted to hot water in the heat exchanger 30. Heat the hot water. Further, the hot water storage tank 10 employs a heat insulating structure so that the heat of the hot water in the hot water storage tank 10 is difficult to escape.

  The hot water storage tank 10 is always filled with hot water, the hot water tank 11 is provided at the bottom of the hot water storage tank 10 and the hot water heated by the heating device 3 is returned from the upper part of the hot water storage tank 10. The hot water in 10 becomes higher in temperature as it goes upward. Here, a plurality of temperature sensors 15 are provided in the hot water storage tank 10 in the vertical direction, and the output of the temperature sensor 15 causes the hot water to reach a predetermined temperature (for example, 90) from above in the hot water storage tank 10. It is possible to determine the amount of hot water in the hot water storage tank 10. Here, the amount of hot water in the hot water storage tank 10 means the amount of hot water at a predetermined temperature or higher in the hot water in the hot water storage tank 10.

  In addition, although the thing of the heat pump system which operate | moves by supplying the electric power supply to a compressor was illustrated as the heating apparatus 3 here, not only this example but a heater-type heating apparatus or a gas combustion-type heating apparatus is used. You can also.

  By the way, in this embodiment, the hot water stored in the hot water storage tank 10 is heated not only by the heating device 3 but also by the exhaust heat exchange unit 21 provided in the power generation device 2 as described above. That is, the heat exchanger 30 of the heating device 3 and the exhaust heat exchanging portion 21 of the power generation device 2 are between the forward line 13 connected to the bottom of the hot water storage tank 10 and the return line 14 connected to the top of the hot water storage tank 10. It is provided in parallel. As a result, the hot water in the hot water storage tank 10 is conveyed to at least one of the heat exchanger 30 in the heating device 3 and the exhaust heat exchange unit 21 in the power generation device 2 through the forward conduit 13, and is stored in the hot water storage through the return conduit 14. The hot water storage tank 10 is returned from the upper part of the tank 10.

  Conveyance of hot water from the hot water storage tank 10 to the heat exchanger 30 and the exhaust heat exchanger 21 is performed by a pump 16 provided on the outgoing line 13 and supplied to each of the heat exchanger 30 and the exhaust heat exchanger 21. The flow rate of the hot water is individually adjusted by the flow rate control valves 17 and 18 provided between the heat exchanger 30 and the exhaust heat exchanging unit 21 and the outgoing line 13 respectively. The pump 16 and the flow rate control valves 17 and 18 on the outgoing line 13 are controlled by the control device 4 together with the heating device 3 and the power generation device 2.

  With the configuration as described above, in the cogeneration system of the present embodiment, both the heat energy generated by the heating device 3 and the heat energy of exhaust heat generated during power generation by the power generation device 2 are used to heat the hot water in the hot water storage tank 10. Can be used.

  Normally, in this type of cogeneration system, the power generation apparatus 2 is not always operated, but is operated according to a time schedule (operation start time, operation time) determined based on past power consumption data and the like. Be controlled. In general, the power consumption amount of the next day is predicted from the power consumption amount of the current day, and the power generation device 2 is operated so that the power generation amount corresponding to the predicted value is generated.

  Here, the control device 4 does not always operate the power generation device 2 but operates the power generation device 2 according to a time schedule (operation start time, operation time) determined based on past power consumption data and the like. To control. Here, the control device 4 starts the operation of the power generation device 2 in the morning. After that, when the amount of hot water in the hot water storage tank 10 is saturated and the exhaust heat of the power generation device 2 cannot be recovered any more, the operation of the power generation device 2 is started. Stop and avoid wasting energy. Therefore, the cogeneration system also supplies power from a commercial power source in a time zone in which there is a power demand exceeding the power generation capacity of the power generation device 2 or a time zone in which the power generation device 2 is not operating.

  Moreover, when the amount of hot water in the hot water storage tank 10 falls below a predetermined lower limit value, the control device 4 supplies hot water stored in the hot water storage tank 10 by operating the heating device 3 regardless of whether or not the power generation device 2 is in operation. It has a heating control means 40 for heating. Thereby, even when a large amount of hot water is used all at once, since the heating device 3 starts operation when the amount of hot water in the hot water storage tank 10 falls below the lower limit value, there is no hot water in the hot water storage tank 10. You can avoid that.

  Furthermore, the control device 4 ensures that a certain amount of hot water is secured in the hot water storage tank 10 in advance before the power generation device 2 starts operation, and the hot water stored in the hot water storage tank 10 even when the power generation device 2 is not operating. Heat. Thereby, even if hot water is used in a large amount of time in the time zone before the power generation device 2 starts operation, such as early morning, it is possible to avoid running out of hot water in the hot water storage tank 10.

  However, when the hot water heated by the heating device 3 is stored in the hot water storage tank 10 before the operation of the power generation device 2 is started, if the hot water in the hot water storage tank 10 is hardly used after that, As soon as the operation is started, the amount of hot water in the hot water storage tank 10 is saturated and the operation of the power generator 2 is stopped. As a result, even when it is desired to generate power in the power generation device 2 due to a large demand for power, the power generation device 2 cannot be operated because the amount of hot water in the hot water storage tank 10 is saturated, and the power generation device 2 is used efficiently. Things that can't be done.

  Therefore, in the present embodiment, the control device 4 controls the operating status of the heating device 3 as described below in order to avoid the amount of hot water in the hot water storage tank 10 being saturated.

  That is, the control device 4 includes a prediction unit 41 that predicts the amount of heat generated by the power generation device 2 every predetermined unit period (here, 1 day), and a heating device before the power generation device 2 starts operation in the unit period. 3 and preheating control means 42 for operating 3. In the prediction means 41, a measurement unit for measuring the amount of power provided in a distribution board (not shown) is connected, and a function of monitoring the amount of power consumed by the load in the house is added.

  At a predetermined time (here, 24:00), the prediction means 41 obtains the amount of power consumed in the past unit period (here, the current day) from the amount of power measured by the measurement unit. The amount of power consumed in a future unit period (here, the next day) is predicted based on the amount of power. The predicting means 41 obtains the power generation amount (power demand) of the power generation device 2 based on the prediction result of the power amount, and predicts the heat generation amount (amount of exhaust heat generated during power generation) corresponding to the power generation amount. To do. The storage means 43 provided in the control device 4 stores a table indicating the correspondence between the power generation amount and the heat generation amount of the power generation device 2.

  Based on the heat generation amount of the power generation device 2 predicted by the prediction unit 41, the preheating control unit 42 determines the amount of heat applied to the hot water stored in the hot water storage tank 10 from the heating device 3 so that the hot water amount in the hot water storage tank 10 is not saturated. Calculate backwards.

  In short, if the amount of heat when the amount of hot water in the hot water storage tank 10 is saturated is the upper limit value qmax, the hot water in the hot water storage tank 10 is used even if the power generation device 2 starts operation in order to use the power generation device 2 efficiently. It is necessary to limit the amount of heat from the heating device 3 so that the amount of heat applied does not exceed the upper limit value qmax. Therefore, as shown in FIG. 3, the preheating control means 42 adds the residual heat quantity q (i-1) of the hot water storage tank 10 at the end of the unit period (24:00) to the total amount of heat applied to the hot water storage tank 10 (qin + qfc). The amount of heat qin is obtained so that the value obtained by adding () falls within the upper limit qmax. Here, the amount of heat applied from the heating device 3 is qin, and the amount of heat generated in the power generation device 2 is qfc.

  The upper limit value qmax is changed by the adjusting means 44 of the control device 4 so that the larger the amount of hot water consumed per unit period, the larger the amount of hot water consumed in the unit period, with a value that can be arbitrarily set by the user by the setting function of the hot water supply device 1 as an initial value. Shall. Specifically, the amount of hot water consumed in the future unit period is predicted based on the amount of hot water consumed in the past unit period, and the upper limit value qmax is changed stepwise based on the prediction result. Here, a new upper limit value qmax is obtained by adding the total value of the amount of heat qout consumed by hot water supply during the unit period and the amount of heat qloss lost due to heat dissipation during the unit period to the upper limit value qmax. However, the configuration is not limited to this, and the upper limit value qmax may be a fixed value.

  Here, the amount of heat qout consumed by the hot water supply and the amount of heat qloss that becomes a heat dissipation loss are predicted by the control device 4 based on the amount of hot water consumed in the past unit period. The amount of hot water consumed can be acquired from a sensor (not shown) provided in the hot water supply apparatus 1. Further, the residual heat quantity q (i−1) can be acquired from the temperature sensor 15 of the hot water storage tank 10.

  Next, the operation of the control device 4 will be described with reference to the flowchart of FIG.

  When a predetermined time (here, 24:00) is reached, the predicting means 41 first obtains the power generation amount (power demand) of the power generation device 2 required in the future unit period (S1), and predicts the calorific value qfc corresponding thereto. (S2). Then, the preheating control means 42 has a value obtained by adding a difference value between the amount of heat generated qfc of the power generator 2 and the total amount of heat (qout + qloss) generated from the hot water storage tank 10 to the residual heat amount q (i-1). It is determined whether it is less than qmax (S3).

  At this time, if it is determined that it is less than the upper limit qmax (S3: Yes), the amount of heat qin applied from the heating device 3 is obtained by “qmax−qfc−q (i−1) + qout + qloss” (S4). On the other hand, if it is determined that the value is equal to or greater than the upper limit value qmax (S3: No), the upper limit value qmax is set to “qfc + q (i−1) so that“ qfc + q (i−1) −qout-qloss ”is less than the upper limit value qmax. -Qout-qloss "(S5). At this time, the amount of heat qin applied from the heating device 3 may be zero, or the amount of heat qin may be obtained by “qmax−qfc−q (i−1) + qout + qloss” using the changed upper limit value qmax. Good. However, the changed upper limit value qmax is valid only for the latest unit period (here, the next day), and is returned to the original upper limit value qmax at the end of the unit period.

  After that, the preheating control means 42 operates the heating device 3 before the power generation device 2 starts operation, so that the amount of heat qin determined as described above is heated against the hot water stored in the hot water storage tank 10. Add from 3. Here, the heating device 3 is generally operated in the midnight time when power consumption due to the load in the house is reduced.

  According to the cogeneration system having the above-described configuration, the preheating control means 42 operates the heating device 3 in advance and secures a certain amount of hot water in the hot water storage tank 10 before starting the operation of the power generation device 2. As a result, a sufficient amount of hot water can be supplied even before the start of operation of the power generation apparatus 2 such as early morning. Moreover, the amount of heat applied in advance by the heating device 3 is determined based on the amount of heat generated by the power generation device 2 within the unit period predicted by the prediction means 41 so that the amount of hot water in the hot water storage tank 10 is not saturated. Even if the apparatus 2 is operated, it is possible to avoid saturation of the amount of hot water in the hot water storage tank 10.

  By the way, different patterns may be used for each season and day of the week for prediction of power consumption and prediction of hot water consumption. That is, instead of simply predicting the next day's power consumption from the current power consumption, the next day's power consumption is predicted from the power consumption of the past unit period (one day) with the same conditions for the season and day of the week. You may do it. Furthermore, the preheating control unit 42 may predict the power consumption amount and the hot water consumption amount for each time period, and may further determine the operation schedule of the heating device 3 based on the prediction result.

  It is also conceivable to provide the prediction means 41 with a correction function for correcting the predicted value of the power consumption based on the weather forecast data. In this case, the correspondence between the weather forecast data and the power consumption of the load is stored in the storage unit 43 in advance, and the prediction unit 41 acquires the weather forecast data for a future unit period, and the weather forecast data and the power consumption of the load. Is used to correct the predicted power consumption value. This makes it easier to predict the power consumption of loads such as air conditioners whose power consumption changes due to the influence of outside air temperature and humidity, and lighting fixtures whose power consumption (usage time) changes due to the effect of sunlight. In particular, the prediction accuracy of the heat generation amount of the power generator 2 is increased.

  Further, in this embodiment, the unit period is described as one day unit. However, the present invention is not limited to this example, and an arbitrary unit period such as a time zone unit, a week unit, a month unit, or the like can be set. is there. Furthermore, the timing for determining the amount of heat from the heating device 3 and the timing for operating the heating device 3 are not limited to the above example, and can be set as appropriate.

(Embodiment 2)
The cogeneration system of the present embodiment is different from the cogeneration system of the first embodiment in that a solar cell (not shown) is added separately from the power generator 2.

  A power conditioner is connected to the solar cell, and DC power generated by the solar cell is converted into AC power by an inverter circuit in the power conditioner and supplied to a load in the house. That is, in this embodiment, since the power can be supplied to the load by both the power generation device 2 and the solar cell, the power generation amount required for the power generation device 2 per unit period is expected to be consumed in the unit period. The amount of power generated by the solar cell is subtracted from the amount of power generated.

  Here, the power generation capacity of the solar cell is not constant, and greatly depends on weather conditions even in the same time zone. Therefore, in the present embodiment, the prediction unit 41 has a function of acquiring weather forecast data for a future unit period and predicting the power generation amount of the solar cell in the unit period based on the weather forecast data. Thereby, the prediction precision of the electric power generation amount of a solar cell improves, As a result, the prediction precision of the emitted-heat amount of the electric power generating apparatus 2 becomes high.

  Moreover, it replaces with the solar cell mentioned above, and the electric power generation apparatus which produces electric power using natural energy sources other than sunlight (for example, renewable energy sources, such as solar heat, wind power, hydropower, biomass, snow ice heat), and power generator 2 May be provided separately. Even in this case, it is assumed that the prediction unit 41 obtains the power generation amount of the power generation device 2 by subtracting the power generation amount of the power generation device from the power amount consumed in the future unit period.

  Other configurations and functions are the same as those of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Hot water supply apparatus 2 Electric power generation apparatus 3 Heating apparatus 4 Control apparatus 10 Hot water storage tank 40 Heating control means 41 Prediction means 42 Preheating control means 44 Adjustment means

Claims (6)

A hot water supply device for performing the hot water supply by hot water in the hot water storage tank having a hot water storage tank to accumulate hot water, a power generation device for heating the hot water to be accumulated in the hot water storage tank by utilizing the waste heat generated during power generation, and the power generation device comprising the heating device for heating the hot water to be separately accumulated in the hot water storage tank, and a control unit for controlling the driving condition of the heating device and the power generating device,
The hot water storage tank is filled with hot water, and an upper limit value of the amount of heat that can be stored in a range below the limit value of the heat amount that can be stored in the entire hot water is set,
Wherein the control device is used, the number prediction means for predicting a heat generation amount of the power generation device for each predetermined unit period, the preheating control means for operating the heating device before the power plant starts operation in the unit period And
The prediction means predicts the amount of power consumed in the unit period in the future based on the amount of power consumed in said unit period in the past, have been predicted heat generation amount of the power generation device based on the predicted ,
The preheating control means the combined heat dissipation for predicted the power generation device by the prediction means to secure the amount of heat required for the unit period, and the amount of heat the upper limit value of the hot water storage tank during the unit period The amount of heat added to the hot water from the heating device is determined so as not to exceed ,
The control device predicts the amount of hot water consumed in the unit period in the future based on the amount of hot water consumed in the unit period in the past, and based on the prediction, the amount of hot water consumed in the unit period increases. A cogeneration system comprising adjusting means for changing the upper limit value so as to increase the upper limit value of the unit period . 2. The cogeneration system according to claim 1 , wherein the control device includes a heating control unit that operates the heating device when the amount of hot water in the hot water storage tank falls below a predetermined lower limit value . It said predicting means, cogeneration system according to claim 1 or claim 2, characterized in that predicting the heat value of the power generation device to the unit period a daily basis. The prediction means obtains weather forecast data for the unit period in the future, and the amount of power predicted to be consumed in the unit period corresponds to the correspondence between preset weather forecast data and power consumption of the load. The cogeneration system according to any one of claims 1 to 3, further comprising a correction function that corrects the error by using the . A solar cell is provided separately from the power generation device, and the prediction means obtains weather forecast data for the unit period in the future, and predicts the power generation amount of the solar cell in the unit period based on the weather forecast data. The cogeneration system according to any one of claims 1 to 4, wherein the power generation amount of the power generation device is obtained by subtracting the power generation amount from the power amount predicted to be consumed in the unit period. system. A power generation device that generates power using natural energy is provided separately from the power generation device, and the prediction means generates power by subtracting the power generation amount of the power generation device from the amount of power consumed in the unit period in the future. cogeneration system according to any one of claims 1 to 4, characterized in that for obtaining the power generation amount of the device.

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