Heat supply system

Abstract

To provide a heat supply system capable of performing an exhaust heat operation using exhaust heat of a heat source machine and highly saving energy at appropriate timing.SOLUTION: A heat supply system includes a heat utilization device A that can use heat of hot water and a heat source machine B that supplies hot water to the heat utilization device A. The heat source machine B includes: an exhaust heat generation device 1 that generates exhaust heat through an operation; a hot water storage tank 2 that stores the generated exhaust heat as hot water; a control section 4 that controls the operation; and an input / output section R1 capable of inputting / outputting various types of information. The heat source machine B is configured to be capable of executing an exhaust heat operation for supplying the hot water stored in the hot water storage tank 2 to the heat utilization device A. The control section 4 predicts whether or not the exhaust heat operation is executed on the basis of data indicating a use status on past exhaust heat operations and external data highly correlated with the exhaust heat operation, and outputs a use condition suitable for the execution of the exhaust heat operation in the input / output section R1 when the exhaust heat operation is predicted.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heat supply system that includes a heat utilization device that can utilize the heat of hot water, such as a bathroom heater / dryer, and a heat source device, such as a combined heat and power supply device that generates not only electricity but also exhaust heat. [Background technology]

[0002] In this type of heat supply system, there has been a conventional system in which hot water is stored in a hot water storage tank using the waste heat generated by the heat source machine, and the hot water stored in the hot water storage tank is supplied to a bathroom heater / dryer to dry the bathroom (see, for example, Patent Document 1). In the heat supply system described in Patent Document 1, when the user commands the waste heat operation, the hot water stored in the hot water storage tank is circulated and supplied to the bathroom heater / dryer without being heated as is, thereby increasing energy efficiency by performing the waste heat operation to dry the bathroom. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-167404 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional configuration described above, the user can command the heat rejection operation at any time. For example, if the user commands the heat rejection operation without knowing that the hot water storage tank does not have enough heat to supply the bathroom heater / dryer, the hot water in the hot water storage tank will not have enough heat to supply the bathroom heater / dryer, so the water must be heated by an auxiliary heater and supplied to the bathroom heater / dryer, resulting in reduced energy efficiency. For example, when using the bathroom drying process to dry clothes hanging in the bathroom, the process may not be performed at a fixed time but at irregular intervals, which could prevent the highly energy-efficient heat rejection operation.

[0005] An object of the present invention is to provide a heat supply system that is capable of performing highly energy-efficient exhaust heat operation that utilizes exhaust heat from a heat source machine at an appropriate timing. [Means for solving the problem]

[0006] The characteristic configuration of the heat supply system of the present invention is a heat supply system comprising a heat utilization device that can utilize the heat of hot water, and a heat source machine that supplies hot water to the heat utilization device, wherein the heat source machine comprises an exhaust heat generating device that generates exhaust heat through operation, a hot water storage tank that stores the exhaust heat generated by the exhaust heat generating device as hot water, a control unit that controls the operation of the heat source machine, and an input / output unit that can input and output various information, wherein the heat source machine is configured to be able to perform exhaust heat operation to supply the hot water stored in the hot water storage tank to the heat utilization device, and the control unit is configured to perform the operating operation of the exhaust heat generating device based on a predetermined operating plan, and predicts whether the exhaust heat operation will be performed based on data indicating the usage status of the past exhaust heat operation and external data that is highly correlated with the exhaust heat operation, and when it is predicted that the exhaust heat operation will be performed, outputs usage conditions suitable for performing the exhaust heat operation at the input / output unit.

[0007] If a user tends to perform the heat exhaust operation at regular intervals, it is possible to determine this tendency based on past usage. Furthermore, if the heat exhaust operation is used to dry clothes, for example, it is affected by external data such as the weather conditions or pollen dispersion status at the time.

[0008] In the present invention, the control unit executes the operation of the exhaust heat generating device based on the operation plan, and is therefore able to predict the storage state in the storage tank. Based on data showing the usage status of past exhaust heat operations and external data highly correlated with the exhaust heat operation, it can predict whether the exhaust heat operation will be performed for a set date, such as the following day. This allows the control unit to determine whether the user is likely to command the exhaust heat operation on the set date. If the exhaust heat operation is predicted to be performed, the control unit can output and inform the user of the usage conditions suitable for executing the exhaust heat operation, such as the appropriate time on the set date. As a result, the user can perform the exhaust heat operation in a favorable condition without a lack of heat, by performing the exhaust heat operation according to the output usage conditions.

[0009] Therefore, it has become possible to provide a heat supply system that can perform highly energy-efficient heat exhaust operation that utilizes the exhaust heat of the heat source machine at an appropriate timing.

[0010] A further characteristic feature of the heat supply system of the present invention is that the input / output unit is capable of inputting response information indicating whether or not the heat exhaust operation is scheduled to be performed under the usage conditions, and the control unit is capable of changing the operating state of the heat source machine depending on differences in the response information.

[0011] According to this configuration, the user can input response information indicating whether or not the heat exhaust operation is scheduled to be performed under the usage conditions via the input / output unit. Depending on the response information, for example, if the heat exhaust operation is not scheduled to be performed under the usage conditions, the control unit can contribute to energy conservation by adjusting the amount of heat exhausted by the heat exhaust generating device, since there is a risk that the heat stored in the hot water storage tank will be wasted.

[0012] A further characteristic feature of the heat supply system of the present invention is that the control unit is configured to execute the operating operation of the exhaust heat generating device based on a predetermined operating plan, and if the exhaust heat operation is scheduled to be performed under the usage conditions, executes the operating operation of the exhaust heat generating device based on the predetermined operating plan, and when new usage conditions different from the usage conditions are set, updates the operating plan to store exhaust heat suitable for the new usage conditions, and executes the operating operation of the exhaust heat generating device based on the new operating plan.

[0013] According to this configuration, when a user sets new operating conditions that differ from the operating conditions, the operation plan is updated and the exhaust heat generating device is operated based on the new operating plan. As a result, the exhaust heat can be used more effectively than when the exhaust heat generating device is operated based on a preset operating plan, which contributes to energy savings.

[0014] A further characteristic feature of the heat supply system according to the present invention is that the heat-utilization device is a bathroom heater / dryer, and the heat exhaust operation is a drying operation in which the bathroom is dried by the bathroom heater / dryer.

[0015] According to this configuration, the exhaust heat can be used to dry the bathroom, and for example, clothes can be dried well.

[0016] A further characteristic feature of the heat supply system of the present invention is that the external data uses at least one of data regarding the weather on the day the heat exhaust operation was performed in the past, data regarding the pollen dispersion situation on the day the heat exhaust operation was performed, and data regarding the dispersion situation of fine particulate matter.

[0017] According to this configuration, by using data on what kind of external environment the heat exhaust operation was performed on in the past, there is a high probability that the heat exhaust operation will be performed on days when similar external environments are predicted in the future. Therefore, by using such data, it is possible to perform highly energy-efficient heat exhaust operation at the appropriate time with precision. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a configuration diagram showing a heat supply system. [Figure 2] FIG. 2 is a diagram illustrating a terminal-side remote controller. [Figure 3] FIG. 1 is a diagram showing past load data. [Figure 4] FIG. 2 is a diagram showing the operating state of a fuel cell. [Figure 5] FIG. 10 is a flowchart for data accumulation. [Figure 6] FIG. 10 is a flowchart for predicting usage. [Figure 7] FIG. 10 is a flowchart for predicting usage. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat supply system according to an embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in Figure 1, the heat supply system according to the present invention comprises a bathroom heater / dryer A as a heat utilization device that can utilize the heat of hot water, and a heat source unit B that supplies hot water to the bathroom heater / dryer A. Heat source unit B comprises a fuel cell (e.g., a polymer electrolyte fuel cell) 1, which is a cogeneration device that generates both heat and electricity, as an example of an exhaust heat generating device that generates exhaust heat during operation.

[0020] As shown in Fig. 1, heat source machine B is equipped with a hot water storage unit 3 that utilizes heat generated by fuel cell 1, stores the recovered heat in hot water storage tank 2 as a heat storage device that stores the recovered heat as hot water, and supplies a heat medium to bathroom heater / dryer A, an operation control unit 4 that controls the operation of heat source machine B, and a main body remote control R1 that serves as an input / output unit that can input and output various types of information. The operation control unit 4 is connected to a terminal control unit 5 (described later) so that information can be communicated with them. The power system of fuel cell 1 is connected so that power can be supplied to power load device 7 via inverter 6.

[0021] The hot water storage unit 3 is composed of a hot water storage tank 2 that stores hot water in a state that forms temperature stratification, a hot water circulation pump 10 that circulates the hot water in the hot water storage tank 2 through a hot water circulation path 9 and circulates the hot water to heat the heat medium that is supplied to the bathroom heater / dryer A, a heat medium circulation pump 11 that circulates the heat medium (hot water) to the bathroom heater / dryer A through a heat medium circulation path 14, a waste heat heat exchanger 13 that heats the hot water flowing through the hot water circulation path 9 with cooling water flowing through the cooling water circulation path 12, a heat medium heating heat exchanger 15 that heats the heat medium flowing through the heat medium circulation path 14 with hot water flowing through the hot water circulation path 9, and a gas-fired auxiliary heater 17 as an auxiliary heating device that heats the hot water flowing through the hot water circulation path 9 by combustion in a burner 16.

[0022] The cooling water circulation path 12 is equipped with a heat exhaust type heat exchanger 13, a heat exhaust recovery heat exchanger 50 for recovering the heat exhausted from the fuel cell 1, and a heat exhaust circulation pump 51 for circulating the cooling water.

[0023] Bathroom heater / dryer A houses heat exchanger 18 and circulation fan 19, which form part of heat medium circulation path 14. Heat medium circulation path 14 is equipped with heat exchanger 18, thermal valve 20, and heat medium circulation pump 11. Heat medium circulation path 14 is used to supply hot water heated by heat medium heating heat exchanger 15 to heat exchanger 18. Heat exchanger 18 installed in bathroom heater / dryer A enables the heating of the air inside bathroom heater / dryer A. Circulation fan 19 draws air that can be heated by heat exchanger 18 from the bathroom and circulates it within the bathroom. The air heated by heat exchanger 18 can be circulated within the bathroom by driving circulation fan 19. Thermal valve 20 is a valve that opens and closes using a thermal element (pellet), and when opened, allows water to circulate through heat medium circulation path 14.

[0024] Bathroom heater / dryer A is equipped with a terminal control unit 5 that controls the operation of bathroom heater / dryer A, and a terminal-side remote control R2 that receives commands related to operation. Terminal-side remote control R2 is configured to transmit various commands received from the user to terminal control unit 5.

[0025] As shown in FIG. 2, the terminal side remote controller R2 is provided with a time display unit 25 that displays the timer operation time or the desired end time, a timer setting switch 27, an air direction switch 28 that commands a change in the airflow direction, a drying operation switch 29 that commands drying operation, a heating operation switch 30 that commands heating operation to heat the bathroom, a ventilation operation switch 31 that commands ventilation operation, a cool air operation switch 32 that commands cool air operation, and a stop switch 33 that stops each operation.

[0026] The hot water storage tank 2 is provided with four tank thermistors Tt spaced apart in the vertical direction as hot water storage amount detection means for detecting the amount of hot water stored in the hot water storage tank 2. In other words, when a tank thermistor Tt detects a temperature equal to or higher than a set temperature, it is determined that hot water is stored at that installation position, and the amount of hot water stored is detected in four stages based on the position of the lowest tank thermistor Tt among the tank thermistors Tt whose detected temperatures are equal to or higher than the set temperature, and when the detected temperatures of all four tank thermistors Tt are equal to or higher than the set temperature, it is determined that the amount of hot water stored in the hot water storage tank 2 is full.

[0027] The hot water circulation path 9 is connected to an outlet path 34 that communicates with the lower part of the hot water storage tank 2 and a hot water storage path 35 that communicates with the upper part of the hot water storage tank 2, and the hot water storage path 35 is provided with a hot water storage valve 36 that adjusts the flow rate of hot water and switches the flow on and off. The hot water circulation path 9 is provided with, in order from the connection point with the outlet path 34 in the hot water circulation direction, a waste heat exchanger 13, a hot water circulation pump 10, an auxiliary heater 17, a heating valve 37 that adjusts the flow rate of hot water and switches the flow on and off, and a heat exchanger 15 for heating the heat medium.

[0028] Hot water circulation path 9 is provided with an inlet thermistor Ti that detects the temperature of the hot water flowing into auxiliary heater 17, and an outlet thermistor Te that detects the temperature of the hot water flowing out from auxiliary heater 17. In addition, hot water supply path 38, which supplies hot water taken out from the top of hot water storage tank 2, is provided with hot water supply heat load measuring means 40 that measures the hot water supply heat load at hot water supply terminal 39, and heating heat load measuring means 41 that measures the heating heat load at bathroom heater / dryer A.

[0029] When operating the fuel cell 1, the operation control unit 4 controls the operating states of the fuel cell 1 and the exhaust heat circulation pump 51, and also controls the operating states of the hot water circulation pump 10 and the heat medium circulation pump 11, thereby performing hot water storage operation to store hot water in the hot water storage tank 2, and heat medium supply operation to supply a heat medium (hot water) to the bathroom heater / dryer A. Furthermore, the operation control unit 4 is configured to perform predicted load calculation processing, data update processing, and operation feasibility determination processing, as described below. The operation control unit 4 is also configured to perform output information switching control to switch the information to be output to the display and speaker of the main unit remote control R1.

[0030] Examples of hot water supply terminal 39 include a hot water tap and a bathtub. When hot water supply is started at hot water supply terminal 39, hot water is taken out from the top of hot water storage tank 2 and supplied through hot water supply path 38. When hot water supply is started and hot water is not stored in hot water storage tank 2, hot water circulation pump 10 is operated, hot water storage valve 36 is opened, and auxiliary heater 17 is operated to heat, so that hot water heated by auxiliary heater 17 is supplied to hot water supply path 38 through hot water storage path 35.

[0031] (Control contents of the operation control unit) The operation control unit 4 is configured to execute the operation of the fuel cell 1 based on a preset operation plan. The operation control unit 4 is configured to predict the time-series predicted heat load amount for the hot water supply terminal 39 for the remaining period within the discrimination target period, and to perform heat-dominant operation in which the fuel cell 1 generates an amount of heat sufficient to cover the predicted heat load amount, thereby determining the operating time period of the fuel cell 1 for heat-dominant operation so as to increase energy conservation when supplying heat, and to operate the fuel cell 1 during that operating time period.

[0032] First, the planned operation of the fuel cell 1 by the operation control unit 4 will be briefly described. The operation control unit 4 obtains predicted load data for that day from past load data based on actual usage conditions, and performs an operation feasibility determination process to determine whether or not the fuel cell 1 can be operated so as to conserve energy from the predicted load data. In this way, the operation control unit 4 is configured to operate the fuel cell 1 when it is determined in the operation feasibility determination process that the fuel cell 1 can be operated, and to stop the operation of the fuel cell 1 when it is determined that the fuel cell 1 cannot be operated. Furthermore, during an operating time period, when the amount of hot water stored in the hot water storage tank 2 becomes full, the operation of the fuel cell 1 is stopped.

[0033] The operation control unit 4 is configured to update and store one day's worth of past load data, which indicates the amount of power load, hot water supply heat load and heating heat load in each time period of the day, in association with the day of the week.

[0034] Regarding the past load data, the past load data consists of three types of load data: power load data, hot water heat load data, and heating heat load data. The past load data for one day is stored in a state where it is divided into each day of the week from Sunday to Saturday, with one hour being the unit of time.

[0035] The past load data is obtained by measuring the amount of power load, the amount of hot water supply heat load, and the amount of space heating heat load per unit time from actual usage conditions, and then obtaining the measured load data.

[0036] The operation control unit 4 determines a time period with a high energy saving level and a large heat load or power load as an operating time period for operating the fuel cell 1. That is, based on the time-series heat consumption data and the time-series power consumption data, the operation control unit 4 determines a time-series predicted heat load (including the heating heat load and the hot water heat load) for a one-day determination period as shown by the dashed lines in Figures 3(b), (c) and 4(a) and a time-series predicted power load as shown in Figure 3(a). Then, based on the predicted heat load and predicted power load and separately determined energy-saving operating conditions, the operation control unit 4 determines an operating time period (shown by the solid line in Figure 4(a)) and a predicted amount of power generation (shown by the solid line in Figure 4(b)) for operating the fuel cell 1.

[0037] (heat medium supply operation) When performing a heat transfer medium supply operation to supply a heat transfer medium (hot water) to the bathroom heater / dryer A, the operation control unit 4 is configured to be able to perform a drying operation in which the hot water in the hot water storage tank 2 is heated by the auxiliary heater 17 and the high-temperature hot water is supplied to the bathroom heater / dryer A, and a heat exhaust operation in which the hot water stored in the hot water storage tank 2 is supplied to the bathroom heater / dryer A without being heated.

[0038] The main body remote control R1 is equipped with an eco-drying operation switch 26 that commands heat exhaustion operation (see Figure 1). When the heat-drying operation switch 29 on the terminal remote control R2 is operated, the operation control unit 4 executes the drying operation. When the eco-drying operation switch 26 on the main body remote control R1 is operated, the operation control unit 4 executes the heat exhaustion operation. In either case, the drying time can be set by the user.

[0039] The operation control unit 4 is configured to predict whether or not heat exhaust operation will be performed based on data indicating the usage status of past heat exhaust operation and external data that is highly correlated with heat exhaust operation, and if it is predicted that heat exhaust operation will be performed, to output the usage conditions suitable for performing heat exhaust operation on the information display unit of the main unit remote control R1.

[0040] That is, as shown in Figure 5, when bathroom heater / dryer A performs a heat exhaust operation in response to a user's use of the heat supply system, operation control unit 4 sequentially accumulates external data on the date, time, and day of the heat exhaust operation (steps #1 and #2). The external data includes weather conditions, temperature conditions, pollen dispersion conditions, and fine particulate matter (PM2.5) dispersion conditions. This information is configured so that operation control unit 4 can obtain it via communication line N, such as the Internet.

[0041] The data to be accumulated is as follows: Data 1: "Date of use: July 1st, Weather on that day: Rain, Pollen count: Low" Data 2: "Date of use: July 3rd, Weather on that day: Rain, Pollen count: High" The data includes:

[0042] Then, based on the data accumulated as described above, the usage trends of bathroom heater / dryer A are analyzed to predict whether bathroom heater / dryer A will be used the next day. For example, if bathroom heater / dryer A is frequently used on rainy days, and more than 60% of the time, it is predicted that there is a high probability that bathroom heater / dryer A will be used if rain is forecast for the next day. In addition, if bathroom heater / dryer A is frequently used on days with high pollen counts, and more than 60% of the time, it is predicted that bathroom heater / dryer A will be used with a high probability if high pollen counts are forecast for the following day. The same is true for fine particulate matter (PM2.5, etc.).

[0043] As shown in Figures 6 and 7, when a certain period of time has passed since the start of power supply and a specified time has come (for example, the time of day when the next day's schedule should be set) (steps #1 and #2), operation control unit 4 analyzes the usage trend of bathroom heater / dryer A (step #3). If the usage rate on rainy days is above a threshold, it increments the "usage count" (steps #4 to #6). If the usage rate on days with high pollen counts is above a threshold, it increments the "usage count" (steps #7 to #9). If the usage rate on days with high levels of fine particulate matter (PM2.5) counts is above a threshold, it increments the "usage count" (steps #10 to #12).

[0044] If the "usage count" for the next day is equal to or greater than the set threshold (step #13), the user's intention to use and the time of use are confirmed (step #14). For example, a message indicating the usage conditions, such as "We recommend that you use bathroom heater / dryer A in exhaust heat operation around 1:00 PM the next day. Would you like to use it?", is displayed on the text information display section of the main unit remote control R1.

[0045] In response to the above display on the main body remote control R1, the user can operate the main body remote control R1 to input response information indicating whether or not heat exhaustion operation is scheduled to be performed. If heat exhaustion operation is scheduled to be performed under the usage conditions, the operation control unit 4 executes the operation of the fuel cell 1 based on a preset operation plan (steps #15 and #16).

[0046] When new usage conditions different from the current usage conditions, i.e., conditions different from the set start time, are set, the operation plan is revised to store exhaust heat suitable for the new usage conditions, and the fuel cell 1 is operated based on the new operation plan (steps #17 and #18). For example, the amount of hot water heat stored in the hot water storage tank 2 is reviewed by bringing forward the power generation start time for the preset operating time period to start power generation earlier, or by variably adjusting the power generation output of the fuel cell 1.

[0047] If the user inputs that they will not use the exhaust heat operation of bathroom heater / dryer A the next day, the fact that it was not used is stored as data, and the threshold value used to analyze the usage trend of bathroom heater / dryer A is corrected and reflected in the next prediction (step #19).

[0048] Furthermore, if sufficient data such as that described above has not been accumulated, it will be impossible to predict whether bathroom heater / dryer A will be used, so it is advisable to accumulate data to the extent that predictions can be made.

[0049] Furthermore, for users who regularly use the bathroom heater / dryer A in exhaust heat operation, this is counted as a hot water load in the planned operation of the fuel cell, so it may not be necessary to perform the control described above.However, for users who use the exhaust heat operation irregularly, for example, only on rainy days, this cannot be reflected in the planned operation, so by performing the control described above, it can be properly reflected in the planned operation.

[0050] [Another embodiment] Other embodiments will be listed below.

[0051] (1) In the above embodiment, data on weather, data on pollen dispersion, and data on fine particulate matter (PM2.5) dispersion are used as external data, but at least one of them or selected two of them can also be used. In addition to these data, various other information can be used as external data, such as data on yellow sand dispersion and temperature data.

[0052] (2) In the above embodiment, the bathroom heater / dryer A is used as the heat-utilization device, but the heat-utilization device is not limited to the bathroom heater / dryer A. A floor heating device or the like can also be used as the heat-utilization device.

[0053] (3) In the above embodiment, an example was shown in which a polymer electrolyte fuel cell was used as the fuel cell 1, but other fuel cells 1 such as a solid oxide fuel cell (SOFC) may also be used as the fuel cell 1.

[0054] (4) In the above embodiment, the exhaust heat generating device is a cogeneration system (fuel cell 1), and the system is configured to predict the time-series predicted heat load of the cogeneration system and perform heat-dominant operation in which the cogeneration system generates an amount of heat sufficient to cover the predicted heat load. However, the system is not limited to this type of operation, and various other operating modes are possible.

[0055] (5) In the above embodiment, an example is shown in which a fuel cell 1 is used as an exhaust heat generating device. However, instead of the fuel cell 1, various configurations can be used, such as a configuration having an engine and a generator, in which heat generated by the engine is used to heat water and store it in the hot water storage tank 2.

[0056] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradictions arise. Furthermore, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0057] INDUSTRIAL APPLICABILITY The present invention can be applied to a heat supply system including a heat utilization device that can utilize the heat of hot water and a heat source machine that supplies hot water to the heat utilization device. [Explanation of symbols]

[0058] 1. Fuel cell (exhaust heat generating device) 4 Operation control unit (control unit) 8 Hot Water Tank A Bathroom heater / dryer (heat utilization device) B Heat source machine R1 Main unit remote control (input / output section)

Claims

1. A heat supply system including a heat utilization device that can utilize the heat of hot water and a heat source machine that supplies hot water to the heat utilization device, The heat source machine is provided with an exhaust heat generating device that generates exhaust heat through operation, a hot water storage tank that stores the exhaust heat generated by the exhaust heat generating device as hot water, a control unit that controls the operation of the heat source machine, and an input / output unit that can input and output various information, the heat source machine is configured to be able to perform a heat exhaust operation in which the hot water stored in the hot water storage tank is supplied to the heat utilization device, The control unit A heat supply system configured to execute the operation of the exhaust heat generating device based on a predetermined operation plan, and to predict whether or not the exhaust heat operation will be performed based on data indicating past usage status of the exhaust heat operation and external data that is highly correlated with the exhaust heat operation, and if it is predicted that the exhaust heat operation will be performed, to output usage conditions suitable for executing the exhaust heat operation via the input / output unit.

2. the input / output unit is capable of inputting response information indicating whether the heat exhaust operation is scheduled to be performed under the usage conditions, The heat supply system according to claim 1 , wherein the control unit is capable of changing the operating state of the heat source machine depending on the difference in the response information.

3. The control unit The system is configured to execute an operation of the exhaust heat generating device based on a preset operation plan, and if the exhaust heat operation is scheduled to be performed under the usage conditions, execute the operation of the exhaust heat generating device based on the preset operation plan; A heat supply system as described in claim 2, wherein when new usage conditions different from the usage conditions are set, the operating plan is updated to store exhaust heat appropriate for the new usage conditions, and the operating operation of the exhaust heat generating device is performed based on the new operating plan.

4. the heat utilization device is a bathroom heater / dryer, The heat supply system according to any one of claims 1 to 3, wherein the heat exhaust operation is a drying operation in which the bathroom heater / dryer dries the inside of the bathroom.

5. The heat supply system of claim 4, wherein the external data uses at least one of data regarding the weather on the day the heat exhaust operation was performed in the past, data regarding the pollen dispersion situation on the day the heat exhaust operation was performed, and data regarding the dispersion situation of fine particulate matter.

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