JP6293609B2 - Heat source device with power generation function - Google Patents

Description

  The present invention relates to a heat source device with a power generation function including a power generation device and a hot water storage tank.

  Various hot water storage tanks (hot water storage tanks) for storing hot water in the tank and heat source devices including the hot water storage tanks have been proposed (see, for example, Patent Document 1). FIG. 7 shows a heat source including a hot water storage tank. An example of an apparatus is shown. This heat source device has a hot water tank 2 and a power generator 1, and the hot water tank 2 is disposed in a case, for example. The power generator 1 is formed by a fuel cell (FC) such as a polymer electrolyte fuel cell (PEFC) or a solid oxide fuel cell (SOFC), a gas engine, or the like. A fuel cell is a power generation device that generates electricity by reacting hydrogen extracted from a fuel such as city gas with oxygen in the air by a reverse reaction of water electrolysis.

  In addition, this heat source device has a water supply passage 20 for supplying water from a water supply source to the hot water tank 2 from the lower side of the hot water tank 2, and for cooling to the power generator 1 from the lower side of the hot water tank 2, for example, 50 ° C. or less. A water supply passage 21 for supplying water (preferably 45 ° C. or less) and hot water heated by the waste heat of the power generator 1 are sent to the hot water tank 2 side from the upper side of the hot water tank 2 to the hot water tank. 2 and a hot water passage 25 for supplying hot water from the upper side of the hot water storage tank 2 to the hot water supply destination. The hot water passage 25 is connected to a branch passage 29 branched from the water supply source via a connection unit 27, and the connection unit 27 is provided with an electromagnetic valve 26 and the like.

  A passage 30 is connected to the connection unit 27, and a water inlet side of a heat source device that directly supplies hot water to a hot water supply destination through the passage 30 or a hot water heater equipped with a burner or the like is connected to the passage 30. Various configurations have been proposed, such as a heat source device that additionally heats hot water that has passed through an auxiliary heat source device as necessary and supplies hot water to a hot water supply destination. In FIG. 7, reference numeral 24 denotes an overpressure relief passage provided with an overpressure relief valve for releasing the pressure to the outside when the pressure in the hot water tank 2 exceeds the allowable pressure. Reference numeral 28 denotes a drainage passage provided with a drainage valve.

  In this type of heat source device, for example, hot water heated by the waste heat of the power generation device 1 and stored in the hot water storage tank 2 is led out through the hot water passage 25, and this hot water and the water supply source are passed through the branch passage 29. The extracted water is mixed by the connection unit 27 as necessary, and hot water having a hot water supply set temperature can be supplied by supplying it to the hot water supply destination through the passage 30 as described above. Moreover, since the electric power can be used by supplying the electric power generated by the electric power generation apparatus 1 to the electric power load apparatus of the user, the apparatus is provided with convenience and energy saving.

  The hot water tank 2 is formed with a temperature layer in the vertical direction, and the upper layer (high temperature layer) of the hot water tank 2 is heated to a high temperature Ta heated by waste heat generated during power generation of the power generator 1. Hot water of (for example, 80 ° C.) is stored, and water at the same temperature Tc (for example, 15 ° C.) as the water supply temperature supplied to the hot water storage tank 2 is stored in the lower layer (low temperature layer) of the hot water storage tank 2. In the meantime, a layer (temperature intermediate layer) having a steep temperature gradient from temperature Ta to temperature Tc is formed. A broken line B in FIG. 7 indicates a boundary between the high temperature layer and the temperature intermediate layer, and is a temperature layer in which water (hot water) on the upper side of the broken line B is substantially used for hot water supply.

JP 2012-209173 A

  By the way, in the heat source device as described above, the boundary line B in FIG. 7 moves to a position far below the position shown in the figure so that most of the hot water tank 2 is filled with the high temperature layer. When reaching the lower side of the tank 2, the temperature of the water supplied to the power generator 1 through the water supply passage 21 becomes higher than 50 ° C. (for example, about 70 ° C.), and the power generator 1 cannot be operated. For this reason, there is a problem that the power use due to the operation of the power generation device 1 becomes impossible.

  Therefore, a configuration in which a radiator is provided in the water supply passage 21 has been proposed. However, since the radiator capable of sufficiently cooling the water supplied from the hot water storage tank 2 to the power generation device 1 is large, for example, the top of the large radiator is provided. In addition, in order to provide the hot water storage tank 2 accommodated in the case, it is necessary to reduce the capacity of the hot water storage tank 2 by the amount of the large radiator, and it becomes impossible to store a sufficient amount of hot water to supply to the user. It will end up.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to efficiently operate the power generation device at a desired timing and to supply a user with a sufficient amount of hot water. Is to provide a heat source device with a power generation function that can store hot water in a hot water tank.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first invention is a power generation apparatus, a hot water storage tank, a water supply passage for supplying cooling water to the power generation apparatus from a lower side of the hot water storage tank, and hot water heated by waste heat of the power generation apparatus. A heat recovery passage for introducing hot water into the hot water tank from the upper side of the hot water tank, and a hot water passage for supplying hot water to the hot water destination from the upper side of the hot water tank, the hot water tank being the hot water tank An air cooling means that is disposed in a case that covers the outer peripheral side of the hot water storage tank with a space therebetween, introduces air outside the case into the case, and cools at least the lower side of the hot water storage tank with the air; Hot water storage for operating the air cooling device to cool the hot water tank by operating the air cooling device earlier than an expected time when the hot water in the hot water tank is expected to be filled with hot water having a predetermined cooling reference temperature or higher. A tank air cooling control means, and the hot water tank air cooling The means is based on the air cooling set time setting information set so that the air cooling set time becomes longer as the temperature based on the temperature outside the case becomes higher and the temperature based on the temperature outside the case. The hot water storage tank is configured to start the air cooling earlier than the time by the air cooling set time.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the power generator is a fuel cell.

  According to the present invention, the cooling water is supplied to the power generator from the lower side of the hot water tank to operate the power generator, but the hot water tank is covered with the hot water tank on the outer peripheral side with a space therebetween. The water stored in the lower part of the hot water tank is cooled by introducing air outside the case into the case by air cooling means and cooling at least the lower part of the hot water tank with the air. For example, power can be generated by operating a power generation device formed of a fuel cell.

  In the present invention, the air cooling by the air cooling means is performed earlier by a predetermined air cooling set time than the expected time at which the hot water in the hot water tank is expected to be filled with hot water having a predetermined cooling reference temperature or higher. The air cooling setting time setting information set so that the air cooling setting time becomes longer as the temperature based on the temperature outside the case of the hot water tank becomes higher, and the temperature based on the temperature outside the case. Based on the temperature based on the temperature outside the case, the hot water in the hot water tank can be cooled at an appropriate timing to start air cooling of the hot water tank earlier than the expected time by the air cooling set time. it can.

  In other words, if the temperature outside the hot water tank case is low, the hot water in the hot water tank can be cooled in a short time. Conversely, when the temperature outside the hot water tank case is high, the hot water in the hot water tank is cooled. Air cooling set time setting information set so that the air cooling set time becomes longer as the temperature based on the temperature outside the case of the hot water tank becomes higher, and the temperature outside the case The air cooling of the hot water tank is started at an appropriate timing regardless of whether the temperature outside the case is high or low, by starting air cooling of the hot water tank earlier than the predicted time by the air cooling set time based on the temperature based on The hot water in the hot water storage tank can be cooled and used as cooling water for the power generation device, and power generation by the power generation device can be performed.

  That is, for example, if the air cooling is started at a certain time earlier than the expected time regardless of the temperature based on the temperature outside the case of the hot water tank, the hot water tank should be air-cooled in winter when the temperature is low. There is a possibility that waste and problems such as reducing the amount of hot water that can be used for hot water supply in the hot water tank, etc., and in the summer when the temperature is high, the hot water tank is not cooled enough to generate electricity However, the present invention can prevent this, and there is no need to reduce the capacity of the hot water tank as in the case of providing a large-sized radiator. It is possible to realize a heat source device having both.

  In addition, by forming the power generation device with a fuel cell, it is possible to provide a heat source device with a power generation function capable of performing efficient power generation using the fuel cell.

Schematic longitudinal sectional views (a), (b) and transverse sectional views (c), (d) showing a simplified arrangement structure of a hot water tank applied to an embodiment of a heat source device according to the present invention. is there. It is a longitudinal cross-sectional view which shows typically the example of the accommodation mode to the outer case of the hot water tank applied to the Example. It is a graph which shows an example of the air cooling setting time setting information given to the heat source apparatus of an Example. It is a block diagram which shows the principal part control structure of the heat-source apparatus which concerns on this invention. It is a graph which shows the example of a relationship between the air cooling time and the hot water temperature in a hot water tank when the temperature outside the case of a hot water tank is different. It is typical cross-sectional explanatory drawing which shows the inside of the case of the hot water tank applied to the other Example of a heat-source apparatus corresponding to AA sectional drawing of FIG.1 (b). It is explanatory drawing which shows typically the system structural example of the heat-source apparatus with an electric power generation function.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are given to the same constituent elements as those in the above-described examples, and the duplicate description is omitted or simplified.

  1 (a) and 1 (b) are schematic longitudinal sectional views schematically showing a hot water storage tank and its peripheral structure applied to an embodiment of a heat source device according to the present invention, respectively. 1C is a simplified cross-sectional view taken along line AA in FIG. 1B, and FIG. 1D is a simplified cross-sectional view taken along line BB in FIG. 1B. Yes. 1A shows a CC cross section of FIG. 1C, and FIG. 1B shows a DD cross section of FIG. 1C.

  This embodiment has the same system configuration as that of the heat source device shown in FIG. 7, and similarly to FIG. 7, the hot water tank 2 has a water supply passage 21, a heat recovery passage 23, and a hot water passage. 25 etc. are connected, but description of those passages is omitted in FIG. Also in this embodiment, an appropriate configuration is applied to the configuration of the system connected to the passage 30 shown in FIG. 7, and the power generator 1 is formed of a fuel cell.

  As shown in these drawings, the hot water storage tank 2 is arranged in a case 3 that covers the outer peripheral side of the hot water storage tank 2 with a space from the hot water storage tank 2, and the case 3 is located on the lower side of the hot water storage tank 2. A bottom plate portion 17 provided, a cylindrical portion 18 provided above the bottom plate portion 17 and covering the outer peripheral side of the hot water tank 2, and a cap shape provided above the cylindrical portion 18 and covering the upper surface side of the hot water tank 2. And a portion 19.

  Further, for example, as shown in FIG. 2, the hot water tank 2 housed in the case 3 includes an air introduction pipe line 33 and an air outlet pipe line 32 connected to the hot water tank 2 and an external case. In this embodiment, such a configuration is applied. 2 shows the diameters of the pipes 32 and 33 to make the explanation easy to understand and the width of the outer case 31 is considerably wider than the width of the case 3, but these sizes ( (Diameter and width) can actually be formed smaller than the mode shown in the figure, and the mode shown in FIG. 2 is not necessarily applied, and this configuration is not limited. .

  As shown in FIGS. 1A and 1B, an air introduction part 4 is provided on the bottom surface side of the bottom plate part 17, and as shown in FIGS. 1B and 1D, a cylindrical shape is provided. Air outlets 5 and 6 are provided at the lower side of the part 18. A fan 10 is provided on the outside of the case 3 at the formation part of the air outlets 5 and 6, and the fan 10 draws air outside the case 3 from the air introduction part 4 to the case by the suction force of the fan 10. 3 and functions as an air cooling means for cooling at least the lower side of the hot water tank 2 with the air.

  As shown in FIG. 1 (d), a shutter 35 is provided outside the arrangement portion of the fan 10, and this shutter 35 has a plurality of louvers (not shown) and opens the shutter 35. The louver is sometimes opened, and the louver is closed when the shutter 35 is closed. The illustration of the shutter 35 is omitted in FIGS. 1 (a) to 1 (c).

  In the case 3, a heat insulating material 7 is provided inside the cylindrical portion 18, and the heat insulating material 7 is provided with a space between the outer peripheral wall of the hot water tank 2 and the outer peripheral wall of the hot water tank 2. Is formed in the case 3 in the vicinity of the. A plurality of air passages 8 (8 a) are formed in the portion where the heat insulating material 7 is spaced from the outer peripheral wall of the hot water tank 2 depending on the distance between the outer peripheral wall of the hot water tank 2 and the heat insulating material 7. The passage 8 (8a) is formed in the outer peripheral direction of the hot water tank 2 with a space between each other.

  Moreover, as shown in FIGS. 1B to 1D, an air passage 8 (8 b) is formed in the case 3 in such a manner that the hot water tank 2 is sandwiched from both sides via a heat insulating material 7. The upper end side of the air passage 8b communicates with the air passage 8a at a position above the cylindrical portion 18 (the communication portion is not shown). The lower end side of the air passage 8 (8b) communicates with the air outlets 5 and 6.

  As shown in FIG. 2, the air outlet 5 is electrically connected to the outside of the outer case 31 via the conduit 32, and the air introduction portion 4 is electrically connected to the outside of the outer case 31 via the conduit 33. In addition, both ends of the pipes 32 and 33 form the same pressure and same wind zone outside the outer case 31. In FIG. 2, there is no description about the pipe connected to the air outlet 6, but a pipe is connected to the air outlet 6 similarly to the air outlet 5, and one end side (air The side opposite to the connection side with the lead-out portion 6) forms the same pressure and same wind zone as the ducts 32 and 33 outside the outer case 31.

  In this embodiment, when the fan 10 provided in the air outlets 5 and 6 is driven, as shown by the arrow in FIG. 1A through the passage 33 shown in FIG. The air is introduced into 3 and passes through the air passage 8 (8 a) and proceeds upward along the outer peripheral side of the hot water tank 2 to absorb the heat of the hot water tank 2 to cool the hot water tank 2. In addition, as shown in FIG. 1 (b), the air heated by the heat absorption of the hot water tank 2 passes through the air passage 8 (8 b), and the hot water tank 2 is spaced from the hot water tank 2. Proceeding downward along the outer peripheral side, the air is led out of the case 3 from the air outlets 5 and 6. The air passes through the pipe line 32 and is led out of the outer case 31. In addition, since the air passage 8 (8b) is arrange | positioned through the heat insulating material 7 with the hot water storage tank 2, it has comprised the structure which prevents that heat is transmitted to the hot water storage tank 2 side from warm air.

  By such an air flow, the hot water in the hot water tank 2 is cooled by taking heat away from the inner wall of the hot water tank 2 (the inner wall of the hot water tank 2 becomes a heat radiating surface), and the cooled water is It moves to the lower side along the inner wall side of the hot water tank 2 and settles and is stored. In addition, since the cylindrical wall of the hot water tank 2 becomes a heat radiating surface in this way, it is better to send air to the upper side of the hot water tank 2 in order to make the heat radiating surface large.

  By the way, in the present embodiment, since the air outlets 5 and 6 are provided with the shutter 35 outside the fan 10, even when air is about to enter from the air outlets 5 and 6 when the shutter 35 is closed. Although it should not be, when a strong wind blows, air may try to flow in a direction in which air enters from a gap between the louvers forming the shutter 35 (air from the wind tends to enter).

  However, the case 3 has an inverted U shape with respect to the formation positions of the air outlets 5 and 6, and is stored on the lower side of the hot water tank 2 even if air blows from the gap between the louvers. Since the water is cold, heat exchange between the air and the water in the hot water tank does not occur, and the cold wind entering from the outside passes through the air passage 8b in the inverted U-shaped case 3 with respect to the formation position of the air outlets 5 and 6. As a result, when the fan 10 is stopped, heat is trapped and no heat is dissipated (if the fan 10 is driven, air is introduced as described above). The air entering from the portion 4 travels upward in the air passage 8a and then exits from the air outlets 5 and 6 through the air passage 8b downward).

  Further, in this embodiment, the pipes 32 and 33 are connected to the air outlets 5 and 6 and the air introduction part 4 as shown in FIG. 2, and one end side thereof (the air outlet part of the pipes 32 and 33). 5 and 6 and the side opposite to the connection side with the air introduction part 4) have the same pressure and same wind zone, so that the force to enter the air and the force to get out are balanced. Even if it blows, air is not introduced from the air outlets 5 and 6, and it is possible to more reliably prevent air from entering and exiting when the fan 10 is stopped.

  Although not shown in FIGS. 1 and 2, in this embodiment, outside the case 3 (for example, outside the external case 31), an outside air temperature in an area where the case 3 is provided is detected. An air temperature detection sensor is provided and is signal-connected to a control device 11 having a control configuration as shown in FIG. In FIG. 4, reference numeral 12 is attached to the outside air temperature detection sensor.

  As shown in the figure, the control device 11 has a hot water tank air cooling control means 13, a memory unit 14, and a fan driving means 15, and is connected to the fan 10 and hot water temperature detection means 16 in the hot water tank. The hot water temperature detection means 16 in the hot water tank detects the temperature of the hot water in the hot water tank 2, and is provided at a plurality of locations in the hot water tank 2 or on the outer wall side of the hot water tank 2 at intervals in the vertical direction. Yes.

  The hot water tank air cooling control means 13 makes the hot water in the hot water tank correspond to an expected time when it is expected to be filled with hot water having a predetermined cooling reference temperature (for example, 70 ° C.) or higher (the hot water tank 2 is fully stored). Thus, the control unit performs air cooling of the hot water tank 2 by operating the fan 10 earlier than the predicted time by a predetermined air cooling set time. At the time of this control, for example, control data as shown in FIG.

  The control data shown in FIG. 3 is given based on, for example, experimental data obtained from the relationship between the air cooling time by driving the fan 10 and the hot water temperature in the hot water tank 2, as shown in FIG. . This data is obtained by variously changing the temperature outside the case 3 of the hot water tank 2 (the outside air temperature, here the temperature detected by the outside air temperature detection sensor 12). In FIG. Is the experimental data when the outside air temperature is 20 ° C, and the characteristic line c is the experimental data when the outside air temperature is 0 ° C.

  As is clear from these characteristic lines a to c, it takes a long time for the air to cool until the hot water temperature in the hot water tank 2 decreases as the outside air temperature increases. For example, it takes about 3 hours for the hot water temperature in the hot water tank 2 to drop to 50 ° C. when the outside air temperature is 35 ° C. (see characteristic line a), and about 30 minutes when the outside air temperature is 0 ° C. Yes (see characteristic line c). The control data shown in FIG. 3 set based on such experimental data has a longer air cooling set time as the temperature based on the temperature outside the case 3 (here, the temperature outside the case 3) becomes higher. The air cooling set time setting information is set as follows.

  The hot water tank air cooling control means 13 obtains an expected time when the hot water in the hot water tank 2 is expected to be filled with hot water having a temperature equal to or higher than the cooling reference temperature based on the detected temperature of the hot water temperature detection means 16 in the hot water tank. Based on the air cooling set time setting information as shown and the temperature based on the temperature outside the case 3 (here, the temperature outside the case 3, for example, the temperature outside the external case 31), the air cooling is performed more than the expected time. A command is given to the fan driving means 15 so as to start the air cooling earlier by the set time. The fan driving means 15 drives the fan 10 based on this command.

  The hot water tank air cooling control means 13 determines the expected time when the hot water in the hot water tank 2 is expected to be filled with hot water equal to or higher than a predetermined cooling reference temperature, for example, the power generator 1 based on the lifestyle of the user. May be obtained in consideration of the learning data, the detection temperature of the outside air temperature detection sensor 12, and the like. In this way, the predicted time can be obtained more accurately.

  This embodiment is configured as described above. For example, as shown by the characteristic line c in FIG. 5, if the temperature outside the case 3 of the hot water tank 2 is low, the hot water in the hot water tank 2 is cooled in a short time. On the contrary, as shown by the characteristic line a in FIG. 5, it takes a long time to cool the hot water in the hot water tank 2 when the temperature outside the case 3 of the hot water tank 2 is high. Corresponding to such characteristics, air cooling set time setting information set such that the air cooling set time becomes longer as the temperature outside the case 3 of the hot water tank 2 increases as shown in FIG. .

  And based on such air cooling set time setting information and the temperature outside the case 3, the air cooling set time is longer than the expected time when the hot water in the hot water tank 2 is expected to be filled with hot water having the cooling reference temperature or higher. By starting the air cooling of the hot water tank as soon as possible, the hot water in the hot water tank 2 is appropriately cooled to cool the hot water in the hot water tank 2 regardless of whether the temperature outside the case 3 is high or low, and used as cooling water for the power generator 1 can do.

  Therefore, the hot water storage using the waste heat at the time of power generation of the power generation apparatus 1 and the power generation by the power generation apparatus 1 using the cooling water supplied from the hot water tank 2 to the power generation apparatus 1 are efficiently improved. It is possible to realize an apparatus that can be performed in a simple manner.

  In addition, this invention is not limited to the said Example, It sets suitably. For example, in the above-described embodiment, one air introduction part 4 for introducing air into the case 3 is provided, and two air outlet parts for deriving air from the case 3 are provided as indicated by reference numerals 5 and 6. Arrangement modes such as the number, arrangement position, size, etc. are not particularly limited and are appropriately set, and are formed so that at least the lower side of the hot water tank 2 arranged in the case 3 can be air-cooled. Just do it. Moreover, the arrangement | positioning aspect of the fan 10, the connection aspect of the pipe lines 32 and 33, etc. are not specifically limited, It sets suitably.

  Moreover, in the said Example, although control was performed using the temperature outside the outer case 31 as the temperature outside the case 3, the temperature inside the outer case 31 may be detected and used.

  Further, in the embodiment, as the air cooling set time setting information based on the temperature outside the case 3, the air cooling set time setting information set so that the air cooling set time becomes longer as the temperature outside the case 3 becomes higher. Based on this information and the temperature outside the case 3, the hot water tank air cooling control means 13 controls the start timing of the air cooling. For example, the temperature based on the temperature outside the case 3 is set as the feed water temperature, and based on the feed water temperature. Air cooling set time setting information may be given, and the start timing of air cooling of the hot water tank 2 may be controlled based on this information and the feed water temperature. That is, when the outside air temperature, which is the temperature outside the case 3, is low, the feed water temperature is low, and when the outside air temperature is high, the feed water temperature is also high, so that the feed water temperature can also be a temperature based on the outside air temperature.

  Further, the temperature outside the case 3 (outside air temperature) and the water supply temperature are both set based on the temperature outside the case 3, and the air cooling setting time setting information based on the outside air temperature and the water supply temperature, and the outside air temperature and the water supply temperature. Based on this, the start timing of the air cooling of the hot water tank 2 may be controlled.

  Moreover, since the outside temperature also changes according to the season, the season information is set to a temperature based on the temperature outside the case 3, and the hot water tank 2 is set based on the air cooling set time setting information based on the season information and the season information. The timing of starting the air cooling may be controlled. In this case, by providing the control device 11 with a calendar function, the cooling start timing of the hot water tank 2 can be controlled without providing a sensor such as the outside air temperature detection sensor 12, so that the cost can be reduced accordingly.

  Furthermore, the formation position of the air passage 8 (8b) is not limited as in the above embodiment, and may be formed at a position as shown in FIG. 6, for example. In addition, although the air derivation | leading-out parts 5 and 6 are not illustrated in FIG. 6, the air derivation | leading-out parts 5 and 6 are also formed in the position corresponding to the formation position of the air channel | path 8b.

  Furthermore, the power generator 1 can also be formed by a gas engine.

  Since the heat source device of the present invention can efficiently operate the power generation device and store hot water in a hot water storage tank, it is easy to use and can be used as, for example, a household heat source device.

DESCRIPTION OF SYMBOLS 1 Power generator 2 Hot water storage tank 3 Case 4 Air introduction part 5,6 Air derivation part 7 Heat insulating material 8 Air passage 10 Fan 11 Control apparatus 12 Outside temperature detection sensor 13 Hot water tank air cooling control means 14 Memory part 15 Fan drive means 16 Hot water storage tank Inner water temperature detection means 21 Water supply passage

Claims (2)

  A power generator, a hot water tank, a water supply passage for supplying cooling water to the power generator from the lower side of the hot water tank, and hot water heated by waste heat of the power generator from the upper side of the hot water tank A heat recovery passage to be introduced into the hot water storage tank, and a hot water passage for supplying hot water to the hot water supply destination from an upper side of the hot water storage tank, and the hot water storage tank has an outer peripheral side of the hot water storage tank and the hot water storage tank. An air cooling means that is arranged in a case that covers the gap and introduces air outside the case into the case and cools at least the lower side of the hot water tank with the air, and hot water in the hot water tank is predetermined. A hot water storage tank air cooling control means for operating the air cooling device to cool the hot water storage tank earlier than an expected time expected to be filled with hot water having a cooling reference temperature or higher. The hot water tank air cooling control means is provided in the case. The air cooling set time is set to be longer than the expected time based on the air cooling set time setting information set to be longer as the temperature based on the air temperature becomes higher and the temperature based on the temperature outside the case. A heat source device with a power generation function, characterized in that air cooling of the hot water tank is started quickly.   The heat source device with a power generation function according to claim 1, wherein the power generation device is a fuel cell.

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