JP6800795B2 - Heat source device - Google Patents

Description

The present invention relates to a heat source device including a main heat source and an auxiliary heat source device.

A heat source device including a hot water storage tank as a main heat source is used (see, for example, Patent Document 1), and FIG. 6 shows a heat source device under development by a schematic system configuration diagram. In the figure, a tank unit 4 provided with a hot water storage tank 2 and a hot water passage 9 is thermally connected to a fuel cell (FC) 1 via a heat recovery passage 3. The fuel cell 1 is formed of, for example, a polymer electrolyte fuel cell (PEFC) or the like, and reacts hydrogen extracted from a fuel such as city gas with oxygen in the air by the reverse reaction of electrolysis of water. It is a power generation device that generates electricity.

The heat recovery passage 3 is a passage for circulating a liquid (here, hot water) between the fuel cell 1 and the hot water storage tank 2 as shown by arrows A and A'in the figure. For example, in the fuel cell 1. The heat recovery passage 3 is provided with a pump (not shown) for circulating a liquid in the heat recovery passage 3. Then, by driving the pump, the water in the hot water storage tank 2 is introduced into the fuel cell 1 through the heat recovery passage 3 as shown by the arrow A'in the figure to be used as cooling water, and this water is used at the time of power generation of the fuel cell 1. After heating by the generated exhaust heat, it passes through the heat recovery passage 3 as shown by the arrow A in the figure and is stored in the hot water storage tank 2 as hot water having a temperature of, for example, 60 ° C. A bypass passage 7 is connected to the heat recovery passage 3 via a three-way valve 6, and the liquid flowing from the fuel cell 1 side to the hot water storage tank 2 side is not passed through the hot water storage tank 2 as needed. It is formed so that it can be returned to 1.

In the hot water storage tank 2, hot water temperature detecting means 5 in the hot water storage tank 2 for detecting the temperature of the hot water in the hot water storage tank 2 are interposed in the hot water storage tank 2 or on the outer wall of the hot water storage tank 2 in the vertical direction of the hot water storage tank 2 at intervals. (5 in FIG. 6) are provided. The hot water temperature detecting means 5a in the hot water storage tank provided at the uppermost position is filled with hot water at a position lower than the upper end of the hot water storage tank 2 by a predetermined length, that is, to, for example, the upper end of the hot water storage tank 2. It is provided at the position of the hot water surface when hot water having a hot water amount 20 liters less than that of the hot water storage tank 2 is introduced into the hot water storage tank 2.

The hot water passage 9 connected to the upper side of the hot water storage tank 2 is a passage for discharging (sending) hot water formed in the hot water storage tank 2, and the hot water passage 9 has a hot water passage 9. The hot water storage tank outlet water temperature detecting means 11 that detects the temperature of the hot water passing through the hot water, the tank hot water mixer 12 that changes the amount of hot water sent through the hot water passage 9, and the presence / absence of hot water being sent through the hot water passage 9. For example, a pilot type tank-side solenoid valve 13 that switches by opening and closing the valve is provided. A pressure relief passage 80 provided with an overpressure relief valve 81 for releasing the pressure to the outside when the pressure in the hot water storage tank 2 exceeds the allowable pressure is connected to the hot water passage 9.

Further, the water supply passage 8 to the heat source device is branched into a water supply passage 8a and a water supply passage 8b, and the water supply passage 8 (8a) on one side is connected to the lower side of the hot water storage tank 2, and the water supply passage 8 on the other side is connected. (8b) is formed so as to join the hot water passage 9 at the merging portion 10. The water supply passage 8b is provided with a water mixer 14 for varying the amount of water flowing from the water supply passage 8b to the merging portion 10 side. In this heat source device, a mixing means for mixing hot water and water merged at the merging portion 10 is formed by having a water mixer 14 and the tank hot water mixing mixer 12, and FIG. 6 shows a system. Although the water mixer 14 and the tank hot water mixer 12 are shown at separate positions because of the configuration diagram, they may be provided in the vicinity of the confluence portion 10. Further, the water supply passage 8 is connected to the water supply.

A passage 18 communicates with the merging portion 10, and a mixing thermistor 28 (28a, 28b) is provided in the passage 18. The tank unit 4 has a function of discharging hot water having a hot water supply set temperature set by using, for example, a remote controller or the like through a hot water passage 9 and a passage 18. The hot water introduction side of the water heater 16 as an auxiliary heat source device is connected to the passage 18 via the hot water introduction passage 15, and as shown by the arrow B in FIG. 6, the hot water passage 2 to the hot water passage 9 and the passage are connected. The hot water sent through the hot water 18 (water is sent from the tank unit 4) is introduced into the hot water supply circuit 62 of the water heater 16 via the hot water introduction passage 15 as shown by the arrow B ”in the figure.

The hot water supply circuit 62 of the water heater 16 includes a hot water supply heat exchanger 17 that is heated by the combustion heat of the hot water supply burner 61. In the figure, the hot water supply heat exchanger 17 heats the combustion gas of the hot water supply burner 61. The main heat exchanger 17a to absorb and the latent heat recovery heat exchanger 17b provided on the upstream side (upstream side of the flow of hot water) of the main heat exchanger 17a to recover the latent heat of the combustion gas of the hot water supply burner 61. And have. It is preferable to provide the latent heat recovery heat exchanger 17b in this way because the water heater 16 having high thermal efficiency can be formed.

Although not shown in the figure, for example, when the hot water supply burner 61 is formed by a gas burner, the hot water supply burner 61 is provided with a gas supply passage for supplying fuel gas, and the gas supply passage is provided with a hot water supply passage through the gas supply passage. A gas on-off valve (gas solenoid valve) for controlling the presence or absence of supply to the burner 61 and a gas proportional valve for adjusting the supply amount thereof are provided. In addition, appropriate components (not shown) such as a combustion fan that supplies and exhausts air to the hot water supply burner 61 are provided, and by controlling the components, the heating of the hot water supply heat exchanger 17 can be controlled. Will be done.

A flow rate detecting means 42 is provided in the passage on the inlet side of the hot water supply circuit 62, and the temperature on the outlet side of the hot water supply heat exchanger 17 (the passage on the outlet side) is provided in the passage on the outlet side of the hot water supply heat exchanger 17. A hot water supply heat exchange side temperature detecting means 67 for detecting the passing hot water temperature) is provided, and further, on the downstream side thereof, a hot water supply temperature detecting means 76 for detecting the temperature of the hot water supplied through the hot water supply circuit 62 (hot water supply temperature). Is provided. A hot water supply passage 19 is provided on the outlet side of the hot water supply circuit 62, and the flow rate detecting means 42 detects the flow rate of hot water supplied through the hot water supply passage 19.

Further, the hot water supply circuit 62 is provided with a bypass passage 68 for leading the hot water introduced into the hot water supply circuit 62 to the passage 18 side without passing through the hot water supply heat exchanger 17. The capacity of the bypass passage 68 is much smaller than the capacity of the hot water supply heat exchanger 17, and as an example, the capacity of the main heat exchanger 17a of the hot water supply heat exchanger 17 is 0.6 liters, and the heat exchange for latent heat recovery is performed. The capacity of the vessel 17b is 0.7 liters, while the capacity of the bypass passage 68 is about 0.06 liters. Note that FIG. 6 is a schematic system diagram, and the sizes of the main heat exchanger 17a, the latent heat recovery heat exchanger 17b, and the bypass passage 68 do not correspond to their respective capacities.

For example, a bypass servo 69 provided with a stepping motor is provided in the bypass passage 68, and the distribution ratio of hot water introduced into the hot water supply circuit 62 to the hot water supply heat exchanger 17 side and the bypass passage 68 are controlled by the bypass servo 69. The configuration is such that the distribution ratio to the side is controlled within a predetermined ratio change range.

For example, by controlling the bypass servo 69, for example, the bypass ratio (the ratio between the hot water supply heat exchanger 17 side and the bypass passage 68 side) is set to 1: 0, and the hot water introduced into the hot water supply circuit 62 is, for example, 100% hot water supply heat exchanger 17. It can be passed to the side, or it can be branched to the bypass passage 68 side at a ratio such that the bypass ratio is 1: 3.5. The ratio of the hot water supply heat exchanger 17 side and the bypass passage 68 side controlled by the bypass servo 69 is appropriately set to an appropriate value within a predetermined bypass ratio change range such as 1: 0 to 1: 3.5. Variable setting.

The heat source device has a follow-up heating hot water supply function in which hot water introduced into the hot water supply circuit 62 of the water heater 16 is heated (additionally heated) by the hot water supply heat exchanger 17 from the hot water passage 9 side, and hot water is supplied from the hot water passage 9. It has a non-additional heating hot water supply function in which hot water introduced into the circuit 62 is supplied to the hot water supply destination through the hot water supply circuit 62 without being heated. The water heater 16 supplies hot water introduced into the hot water supply circuit 62 mainly through the bypass passage 68 (in this way, the bypass servo 69 is controlled) when the non-additional heating hot water supply function is operated.

The hot water that has passed through the hot water supply circuit 62 of the water heater 16 can be either hot water that has passed through the hot water supply circuit 62 while being heated by the additional heating hot water supply function, or hot water that has passed through the hot water supply circuit 62 without being heated by the non-additional heating hot water supply function. Hot water is supplied to one or more hot water supply destinations in order through the hot water supply passage 19. Although not shown in the figure, a hot water tap (including a shower operation lever) is provided on the tip side of the hot water supply passage 19, and by opening the hot water tap, the water can be stored in the hot water storage tank 2. The hot water that has been collected passes through the hot water passage 9 under the water supply pressure, and is mixed with the water from the water supply passage 8b as necessary, is additionally heated by the water heater 16, or is mixed with water. Hot water is supplied as it is without additional heating.

Further, although not shown, the water heater 16 is provided with, for example, a circuit for reheating the bath, and the circuit can be used to fill the bathtub with hot water or reheat the hot water in the bathtub.

In the figure of FIG. 6, reference numeral 25 is a water entry temperature thermistor, reference numeral 26 is an FC high temperature thermistor for detecting hot water temperature introduced from the fuel cell 1 to the hot water storage tank 2, and reference numeral 27 is from the hot water storage tank 2 to the fuel cell 1 side. Derived FC low temperature thermistors for hot water temperature detection are shown, reference numerals 29 are water supply flow rate sensors, reference numerals 50 and 51 are check valves, 52 to 57 are valves, 58 are low temperature sensing thermistors, 59 and 60 are filters, 82. Indicates an overflow passage, 83 indicates a drainage electromagnetic valve, and 84 indicates a drainage passage.

The heat source device shown in FIG. 6 is provided with a control device (not shown), and the control device controls the tank hot water mixer 12 to control the flow rate of hot water flowing from the hot water passage 9 to the confluence portion 10 side. Mixing flow rate control means that controls and controls the water mixer 14 to control the flow rate of water flowing from the water supply passage 8b to the merging portion 10 side so that the merging portion 10 forms a mixed hot water of an appropriate temperature. Is provided.

When the hot water supply is stopped, for example, the mixing flow rate control means closes the tank-side solenoid valve 13 so that the flow rate of the hot water flowing from the hot water passage 9 to the confluence 10 side (hot water discharged from the hot water storage tank 2) becomes zero. .. Then, when the hot water tap provided on the tip side of the hot water supply passage 19 is opened, the flow of water is detected by the water supply flow rate sensor 29, so that the mixing flow rate control means receives the detection signal and the tank side electromagnetic valve 13 By controlling the tank hot water mixer 12, the flow rate of hot water flowing from the hot water passage 9 to the confluence 10 side is adjusted as shown by the arrow B in FIG. 6, and by controlling the water mixer 14, FIG. As shown by the arrow B'of 6, the flow rate of the water flowing from the water supply passage 8b to the merging portion 10 side is adjusted, and the temperature of the mixed hot water formed at the merging portion 10 is set to be about the same as, for example, the hot water supply set temperature. Set the mixing temperature.

In the hot water stored in the hot water storage tank 2, for example, layers Wa, Wb, and Wc having temperatures as shown in the schematic diagram of FIG. 7 are formed, and the upper layer of the hot water storage tank 2 is formed. Hot water of high temperature Ta (for example, 60 ° C.) heated by the exhaust heat generated during power generation of the fuel cell 1 is stored in the (high temperature layer) Wa, and the hot water storage tank is stored in the lower layer (low temperature layer) Wc of the hot water storage tank 2. Water having the same temperature Tc (for example, 15 ° C.) as the water supply temperature to be supplied is stored in 2, and there is a layer (temperature intermediate layer) Wb having a steep temperature gradient from temperature Ta to temperature Tc between them. .. Therefore, when the hot water in the layer Wa runs out, cold water may be sent from the hot water passage 9 instead of the hot water, but for convenience of explanation, hot water is discharged from the hot water passage 9 unless otherwise specified. The expression of being merged into the merging portion 10 is used.

For example, as shown in FIG. 7, in the hot water in the hot water storage tank 2, for example, the boundary between the layer Wa and the layer Wb is below the arrangement region of the hot water temperature detecting means 5a in the hot water storage tank, and the hot water temperature detecting means in the hot water storage tank When the detected temperature of 5a is higher than the threshold value set to be 5 ° C higher than the hot water supply set temperature, the temperature of the hot water discharged from the hot water storage tank 2 is a substantially constant value such as 60 ° C.

Therefore, in the mixing flow rate control means, the detection temperature of the mixing thermistor 28 (28a, 28b) is set to be mixed based on the difference between the detection temperature of the mixing thermistor 28 (28a, 28b) and the mixing set temperature (according to the deviation). By controlling the tank hot water mixer 12 and the water mixer 14 so as to have a temperature, the flow rate of hot water flowing from the hot water passage 9 to the merging portion 10 side and the flow rate of water flowing from the water supply passage 8b to the merging portion 10 side Control to adjust. The mixing flow rate control means may perform only feedback control without performing feedforward control when controlling the mixing flow rate.

Then, when the temperature of the mixed hot water formed at the confluence 10 is set to the mixed set temperature (for example, the same temperature as the hot water supply set temperature or a temperature close thereto) by the control by such a kissing flow rate control means, the mixed hot water is changed. , As shown by the arrow B "in FIG. 6, the water heater 16 is introduced from the confluence 10 through the hot water introduction passage 15, but at this time, the water heater 16 is not heated by the hot water heat exchanger 17 ( By the operation of the non-heated hot water supply function), hot water is supplied to the hot water supply destination through the passage 18 and the hot water supply passage 19.

On the other hand, if the detection temperature of the hot water temperature detecting means 5a in the hot water storage tank is equal to or lower than the threshold value, it is not possible to supply hot water having a mixed set temperature set to a temperature equivalent to the hot water supply set temperature only by the flow rate control by the mixing flow rate control means. In this case, for example, the mixing set temperature is set to a temperature lower than the hot water supply set temperature. As an example, the mixed hot water is lowered to a value obtained by subtracting the temperature that rises when the water of the hot water supply flow rate is heated by the MIN number (minimum combustion number) of the water heater 16 from the hot water supply set temperature, and the mixed hot water is supplied. Hot water having a set temperature for hot water supply is produced by heating by the hot water supply heat exchanger 17 by the operation of the additional heating hot water supply function of the water heater 16, and this hot water is supplied to the hot water supply destination through the hot water supply passage 19. Further, instead of supplying hot water from the tank unit 4 side to the water heater 16 side, the water supplied from the water supply passage 8b to the water heater 16 side is heated by the hot water heat exchanger 17 to produce hot water at the hot water supply set temperature. , Hot water is also supplied to the hot water supply destination as needed.

In the conventional heat source device provided with the hot water storage tank 2, a type (integrated type) heat source device in which the tank unit 4 and the water heater 16 are arranged adjacent to each other has been used, but the heat source device under development is An individually arranged heat source device in which the tank unit 4, the water heater 16, and the fuel cell 1 are individually arranged and connected to each other by piping is also possible. In this way, for example, among the plurality of types of tank units 4, the user selects the tank unit 4 provided with the hot water storage tank 2 having the required capacity, and selects the tank unit 4 and the plurality of types of water heaters 16. It is possible to combine the water heater 16 and the fuel cell 1 selected from the plurality of types of fuel cells 1 to increase the variation. Further, the individually arranged heat source device as described above has an advantage that the tank unit 4 or the like can be connected to the existing water heater 16 to form the heat source device.

Japanese Patent No. 3728265

By the way, in the heat source device as shown in FIG. 6, when hot water having a temperature higher than the threshold value is stored in the hot water storage tank 2, the hot water supply temperature is substantially higher than the set hot water supply temperature (for example, the hot water is from the hot water storage tank 2 to the water heater). When hot water is stored from the hot water storage tank 2 to the water heater 16 when hot water is stored at a temperature higher than the set temperature of the hot water supply, for example, 0.5 ° C., which is more than the amount of water that cools before being supplied to the hot water supply destination through 16. It is possible to supply hot water to the hot water without heating (without additional heating by the hot water supply heat exchanger 17 of the water heater 16), but even when the hot water temperature in the hot water storage tank 2 is high in this way, The hot water introduction passage 15 and the pipeline in the water heater 16 are cold, such as when the hot water is supplied for the first time after the heat source device is installed, or when the hot water is discharged again after a time such as 8.5 minutes or more has passed since the hot water supply was stopped. In some cases, it is necessary to heat the water in these pipelines. Especially in winter, the pipes are extremely cold, so even if the time from the stop of hot water supply is 3 minutes or less, the effect is large.

Further, in particular, when the hot water introduction passage 15 is long, it takes a long time for the hot water sent from the hot water storage tank 2 to the water heater 16 to reach the water heater 16, so that it is possible after the user opens the water heater. In order to quickly supply hot water at a set temperature, it is important to burn the hot water burner 61 of the water heater 16 to quickly form hot water when the hot water supply is started. Then, it is considered important to stop the combustion of the hot water supply burner 61 at an appropriate timing when the hot water supplied from the hot water storage tank 2 reaches the water heater 16.

However, in the heat source device having the system configuration as shown in FIG. 6, a temperature sensor for detecting the temperature of the hot water introduced into the water heater 16 is not provided, and the water heater 16 uses a predetermined method. The temperature of the hot water introduced into the water heater is calculated as a calculated water temperature (recognized value), and based on the calculated temperature, it is determined that the hot water of the hot water supply set temperature has substantially reached the water heater 16 from the hot water storage tank 2. Attempts were made to stop the combustion of the hot water supply burner 61 when the temperature was increased, but sufficiently satisfactory results were not obtained.

The present invention has been made to solve the above problems, and an object of the present invention is to provide hot water from a main heat source at the start of hot water supply in a heat source device in which a hot water introduction side of an auxiliary heat source device is provided on the downstream side of the main heat source. It is an object of the present invention to provide a heat source device capable of stabilizing a hot water supply temperature when sending hot water to an auxiliary heat source device to supply hot water.

In order to achieve the above object, the present invention is a means for solving a problem with the following configuration. That is, the first invention has a hot water supply circuit of an auxiliary heat source device having a main heat source having a function of discharging hot water and having a hot water supply heat exchanger on the downstream side of the passage of hot water discharged from the main heat source. The hot water introduction side is connected, and the auxiliary heat source device includes a hot water supply temperature detecting means for detecting the temperature of the hot water introduced to the hot water introduction side of the hot water supply circuit, a hot water supply burner for heating the hot water supply heat exchanger, and the like. The combustion control means for controlling the combustion of the hot water supply burner, the hot water supply heat exchange side temperature detecting means for detecting the temperature on the outlet side of the hot water supply heat exchanger, and the hot water supply heat exchanger for hot water introduced into the hot water supply circuit. A bypass passage for deriving from the hot water supply circuit without passing through the hot water supply circuit and a bypass servo provided in the bypass passage are provided, and the bypass servo is controlled by the bypass servo control means to be introduced into the hot water supply circuit. Has a configuration in which the distribution ratio to the hot water supply heat exchanger side and the distribution ratio to the bypass passage side are controlled within a predetermined bypass ratio change range, and the hot water supply is set when hot water supply is started. Hot water at a temperature is sent from the main heat source side to the hot water supply circuit side of the auxiliary heat source device, and the combustion control means of the auxiliary heat source device has a function of starting combustion of the hot water supply burner to allow hot water to pass through the hot water supply circuit. While supplying hot water by heating with the hot water supply heat exchanger, the detection temperature of the water supply temperature detecting means is taken in, and the detection temperature is the detection temperature of the hot water supply set temperature, the hot water supply heat exchange side temperature detecting means, and the bypass ratio change range. When the maximum value of the bypass ratio to the bypass passage side in the above is obtained in advance and the water supply limit temperature is lower than the hot water supply set temperature, the combustion of the hot water supply burner is stopped and hot water supply is continued. It is a means to solve problems with a structure.

Further, in the second invention, in addition to the configuration of the first invention, the auxiliary heat source device has a heat exchange reference temperature at which the temperature of hot water discharged from the hot water supply heat exchanger through the hot water supply heat exchanger is obtained in advance. The combustion of the hot water supply burner is controlled by the combustion control means so that the ratio of the hot water of the heat exchange reference temperature discharged from the hot water supply heat exchanger and the hot water of the hot water exchange reference temperature merging through the bypass passage is determined. The bypass servo control means is characterized by having a hot water supply temperature control configuration that controls so that hot water of the hot water supply heat exchanger is supplied by being variable by the control of the bypass servo.

Further, in the third invention, in addition to the configuration of the first or second invention, the bypass servo control means has a maximum distribution ratio to the bypass passage side within the ratio change range after the hot water supply burner is stopped. It is characterized in that the bypass servo is controlled so as to be.

Further, in the fourth invention, in addition to the configuration of the first, second or third invention, the hot water supply heat exchanger of the auxiliary heat source device is a main heat exchange that absorbs the actual heat of the combustion gas of the hot water supply burner. It has a device and a heat exchanger for latent heat recovery provided on the upstream side of the main heat exchanger to recover the latent heat of the combustion gas, and recovers the hot water sent from the main heat source to the auxiliary heat source device. It has a function to supply hot water to the hot water supply destination by passing it through the hot water exchanger and the main heat exchanger in order, and on the main heat source side, the hot water sent from the main heat source side to the hot water supply circuit side of the auxiliary heat source device. A hot water supply temperature adjusting means for adjusting the temperature is provided, and the hot water supply heat discharge side temperature detecting means detected after the combustion of the hot water supply burner is stopped after the combustion of the hot water supply burner is started in the hot water supply operation during the trial operation of the heat source device. Based on the detected temperature, the first set capacity based on the time required from the stop of the hot water supply burner to the detection temperature of the hot water supply heat exchange side temperature detecting means lower than the hot water supply set temperature and the hot water supply flow rate, and the hot water supply The second set capacity based on the time required to return to the hot water supply set temperature after the detection temperature of the heat exchange side temperature detecting means falls below the hot water supply set temperature and the hot water supply flow rate, and the output side of the main heat exchanger. It has a temperature control information setting means for setting the raising temperature based on the temperature characteristics until the temperature of the hot water supply becomes lower than the hot water supply set temperature and then returns to the hot water supply set temperature as the temperature control information of the hot water supply temperature control means. Based on the temperature control information, the hot water temperature control means sends the temperature of hot water from the main heat source side to the hot water supply circuit side of the auxiliary heat source device from the start of hot water supply until the capacity of the hot water reaches the first set capacity. Is set to a temperature higher than the hot water supply set temperature from reaching the first set capacity until reaching the second set capacity, and after reaching the second set capacity, the hot water supply setting It is characterized by having a temperature.

Further, in the fifth invention, in addition to the configuration of the fourth invention, the temperature control information setting means is a means for detecting the temperature on the hot water supply heat exchange side after the combustion of the hot water supply burner that started burning at the start of hot water supply is stopped. The detection information is monitored for each hot water supply operation of the heat source device, for each predetermined number of hot water supply operations, or for each predetermined monitor timing for each predetermined set period, and at the time of the monitoring, the hot water supply heat delivery side temperature detecting means The temperature difference from the hot water supply set temperature in the temperature drop region where the detected temperature of is lower than the hot water supply set temperature exceeds the allowable range predetermined for the temperature difference from the hot water supply set temperature in the temperature drop region during the trial run. When they are different, the temperature control information to be applied after the next hot water supply operation of the monitored hot water supply operation is changed and set according to a different degree beyond the allowable range of the temperature difference. To do.

Further, the sixth invention has, in addition to the configuration of the fourth invention, a hot water supply temperature detecting means for detecting the temperature of hot water supplied through the hot water supply circuit as a hot water supply temperature, and the temperature control information setting means is a hot water supply. The hot water supply temperature detected by the hot water supply temperature detecting means after the combustion of the hot water supply burner that started combustion at the start is stopped is set for each hot water supply operation of the heat source device, for each predetermined number of hot water supply operations, or for each predetermined set period. It is monitored at each predetermined monitor timing, and when the detection temperature of the hot water supply temperature detecting means at the time of monitoring becomes different from the predetermined allowable range with respect to the hot water supply set temperature, the monitoring is performed. It is characterized in that the raising temperature of the temperature control information applied after the next hot water supply operation of the hot water supply operation is changed and set according to a different degree beyond the allowable range of the hot water supply temperature.

Further, in the seventh invention, in addition to the configuration of the fourth, fifth or sixth invention, a water supply passage is connected to the hot water introduction side of the auxiliary heat source device in addition to the hot water passage discharged from the main heat source. If the main heat source and the hot water introduction side of the hot water supply circuit of the auxiliary heat source device are connected via a connection pipe and the length of the connection pipe is shorter than the preset length given in advance, the hot water supply is performed. Instead of sending hot water from the main heat source side to the hot water supply circuit side of the auxiliary heat source device when it is started, the auxiliary heat source device is used from the water supply passage until a predetermined water introduction time elapses from the start of hot water supply. It is characterized by having a hot water introduction variable means at the start of hot water supply, in which water is introduced into the auxiliary heat source device and hot water discharged from the main heat source through the hot water passage is introduced into the auxiliary heat source device after the water introduction time has elapsed. ..

Further, in the eighth invention, in addition to the configuration of any one of the first to seventh inventions, the main heat source has a hot water storage tank, and a passage for hot water discharged from the hot water storage tank and a water supply passage are provided. A mixing means for mixing hot water and water to be merged at the merging portion is provided, a hot water introduction passage for introducing the hot water formed by mixing by the mixing means into an auxiliary heat source device, and the above. It has a mixing flow rate control means for controlling the flow rate of hot water and the flow rate of water flowing to the confluence by controlling the mixing means, and the hot water supply temperature adjusting means gives a command to the mixing flow rate control means to give a command to the main heat source. It is characterized in that the temperature of the hot water sent from the auxiliary heat source device to the auxiliary heat source device is adjusted.

According to the present invention, the hot water introduction side of the hot water supply circuit of the auxiliary heat source device equipped with the hot water supply heat exchanger is connected to the downstream side of the passage of the hot water discharged from the main heat source having the function of discharging hot water. The hot water sent from the main heat source is supplied through the hot water supply circuit of the auxiliary heat source device, but it has a function to start the combustion of the hot water supply burner in the auxiliary heat source device when the hot water supply is started, for example, at the time of cold start. Even if the hot water in the hot water supply circuit of the auxiliary heat source device or the hot water in the passage (pipeline) connecting the main heat source and the auxiliary heat source device is lower than the hot water supply set temperature, the hot water is supplied by the hot water supply burner combustion in the hot water supply heat exchanger. Hot water can be supplied by heating to a set temperature for hot water supply or its vicinity.

Further, when the hot water supply is started as described above, the combustion of the hot water supply burner in the auxiliary heat source device is started, and the hot water of the hot water supply set temperature is sent from the main heat source side to the hot water supply circuit side of the auxiliary heat source device. When doing so, the combustion control means of the auxiliary heat source device takes in the detection temperature of the water supply temperature detecting means (the temperature of the hot water introduced to the hot water introduction side of the hot water supply circuit), and the detected temperature becomes equal to or higher than the water supply limit temperature lower than the hot water supply set temperature. Since the combustion of the hot water supply burner is stopped when the temperature is reached, the hot water supply burner can be stopped at an appropriate timing to continue the hot water supply, and the hot water that has reached the auxiliary heat source device from the main heat source is heated excessively. It is possible to prevent overshoot of the hot water supply temperature that occurs.

That is, the water supply limit temperature is a value obtained in advance by the hot water supply set temperature, the detection temperature of the hot water supply heat exchange side temperature detecting means, and the maximum value of the bypass ratio to the bypass passage side in the bypass ratio change range. Although the temperature is lower than the hot water supply set temperature, the information for obtaining the water supply limit temperature (for example, an arithmetic expression) is obtained and given by, for example, an experiment or a simulation, and the hot water at this temperature is the auxiliary heat source. It is given so that a temperature capable of suppressing the occurrence of overshoot of the hot water supply temperature by stopping the combustion of the hot water supply burner when introduced into the apparatus can be obtained as the water supply limit temperature. Therefore, by stopping the combustion of the hot water supply burner when the detection temperature of the water supply temperature detecting means exceeds the water supply limit temperature, the combustion of the hot water supply burner is stopped at a very accurate timing, and the combustion reaches from the main heat source to the auxiliary heat source device. It is possible to prevent overshoot of the hot water supply temperature caused by excessive heating of the hot water.

In addition, even after the combustion of the hot water supply burner of the auxiliary heat source device is stopped, the hot water passing through the hot water supply heat exchanger is heated by the amount of heat possessed by the hot water supply heat exchanger until the hot water supply heat exchanger cools down. , The amount of heat possessed by the hot water heat exchanger changes according to the amount of heat burned by the hot water burner. Therefore, in the present invention, the combustion of the hot water supply burner is controlled by the combustion control means so that the temperature of the hot water discharged from the hot water supply heat exchanger through the hot water supply heat exchanger becomes the heat exchange reference temperature obtained in advance, and the hot water supply heat. The hot water of the hot water supply heat exchanger is supplied by changing the ratio of the hot water of the heat exchange reference temperature that comes out of the exchanger and the hot water that joins the hot water of the heat exchange reference temperature through the bypass passage by controlling the bypass servo. When controlled so as to be performed (providing such a hot water supply temperature control configuration), the amount of heat retained after the combustion of the hot water supply heat exchanger is stopped can be set to a constant value regardless of the hot water supply set temperature.

That is, by providing the hot water supply temperature control configuration having the above configuration, the water supply limit temperature can be set to a value that is not affected by the hot water supply set temperature, and when the detection temperature of the water supply temperature detecting means becomes equal to or higher than the hot water supply limit temperature, the hot water supply burner The hot water supply temperature can be stabilized by stopping the combustion of the hot water and continuing the hot water supply.

Further, in the present invention, after the hot water supply burner is stopped, the bypass servo is controlled so that the distribution ratio to the bypass passage side becomes maximum within the ratio change range, and hot water from the main heat source is mainly passed through the bypass passage side. By supplying hot water, it is possible to supply hot water in a state where it is not easily affected by the heat of the hot water supply heat exchanger per unit time, and the hot water supply temperature can be appropriately stabilized.

Further, the hot water supply heat exchanger of the auxiliary heat source device is provided in the main heat exchanger that absorbs the sensible heat of the combustion gas of the hot water supply burner and on the upstream side of the main heat exchanger to recover the latent heat of the combustion gas. Auxiliary heat source devices having a heat exchanger for recovering latent heat have become widely used in recent years, and such types of auxiliary heat source devices have an advantage of being able to improve thermal efficiency.

However, in this type of auxiliary heat source device, the hot water sent from the main heat source to the auxiliary heat source device is led out through the main heat exchanger on the downstream side after passing through the latent heat recovery heat exchanger, and the bypass is described. Since it merges with the hot water that is led out through the passage side and exits from the hot water supply circuit to be supplied, the temperature of the hot water that passes through the hot water supply heat exchanger side and the hot water that passes through the bypass passage side changes over time as described below. It is necessary to consider each. Therefore, by performing the following control after taking this into consideration, it is possible to stabilize the hot water supply temperature after the hot water supply burner of the auxiliary heat source device is stopped, as described below.

That is, in the present invention, as described above, the hot water supply burner of the auxiliary heat source device that started combustion at the start of hot water supply stops the combustion of the hot water supply burner when the detection temperature of the water supply temperature detecting means becomes equal to or higher than the water supply limit temperature. However, at this time, the hot water in the bypass passage is unheated hot water at a low temperature. On the other hand, if the hot water supply heat exchanger is configured to have the latent heat recovery heat exchanger and the main heat exchanger as described above, in the main heat exchanger of the hot water supply heat exchanger, the temperature of the hot water on the outlet side is, for example. It is the heat exchange reference temperature set to a high temperature, and the temperature on the inlet side is a temperature that rises in the latent heat recovery heat exchanger and the main heat exchanger, although it is heated by the latent heat recovery heat exchanger. For example, the hot water temperature is a low temperature (a low temperature that is almost unheated) in which only about 14% (= 4/28) is heated.

Immediately after the hot water burner stops burning, the main heat exchanger of the hot water heat exchanger remains hot (the amount of heat held is large). For example, of the hot water introduced into the hot water supply circuit when the hot water burner stops burning. Maximize the flow rate of hot water supplied through the bypass passage side within the range of change in the bypass ratio under the control of the bypass servo (for example, set the bypass ratio between the hot water supply heat exchanger side and the bypass passage side to 1: 3.5). If the flow rate of hot water introduced into the hot water supply circuit to the bypass passage side is increased, hot water passes through the main heat exchanger in a hot state (because the flow rate ratio to the hot water supply heat exchanger side is usually large during combustion). Although the flow rate is smaller than during combustion of the hot water supply burner, the temperature of the hot water derived from the main heat exchanger is still higher than the set temperature of the hot water supply, and the hot water at a higher temperature and the heating derived from the bypass passage By merging hot water with a lower temperature that has not been provided at the outlet side of the bypass passage, hot water can be supplied from the hot water supply circuit as the set temperature for hot water supply. In this specification, the hot water supply set temperature means a temperature at or near the hot water supply set temperature.

Normally, the capacity of the bypass passage is formed smaller than the capacity of the hot water supply heat exchanger, and the flow rate to the bypass passage side is increased after the combustion of the hot water supply burner is stopped. Therefore, the bypass passage is normally formed when the combustion of the hot water supply burner is stopped. All the cold water in the room is immediately taken out from the bypass passage.

Further, in the present invention in which the hot water supply heat exchanger of the auxiliary heat source device has a main heat exchanger and a heat exchanger for latent heat recovery, for example, during a hot water supply operation in a trial run mode in which a trial run of the heat source device is performed, combustion occurs at the start of hot water supply. The detection information of the hot water supply heat exchange side temperature detecting means after the start of combustion of the hot water supply burner is stopped is detected, and based on the detection information, the temperature control information setting means serves as the temperature control information by the hot water supply temperature control means. The setting is done.

As one of the setting items, the first set capacity is based on the time required from the stop of the hot water supply burner to the temperature lower than the hot water supply set temperature and the hot water supply flow rate. When the temperature of the hot water sent from the main heat source to the auxiliary heat source device side is controlled to be the hot water supply set temperature until the capacity of the hot water reaches the first set capacity, the temperature is lower than that in the bypass passage. After the hot water of the above temperature was derived, hot water of the hot water supply set temperature that reached the hot water introduction side of the hot water supply circuit from the main heat source side was introduced into the bypass passage a little later than the combustion stop of the hot water supply burner. Derived through a bypass passage.

On the other hand, on the hot water supply heat exchanger side, after the combustion of the hot water supply burner is stopped, the hot water on the outlet side of the main heat exchanger is taken out, and then the hot water is closer to the inlet side of the main heat exchanger than the hot water. Until the first set capacity of hot water is introduced into the auxiliary heat source device, the amount of hot water held by the main heat exchanger is sequentially increased, such that the existing hot water is derived from the main heat exchanger. It is derived from the main heat exchanger. In this way, the temperature of the hot water derived from the main heat exchanger is (for example, the amount of heat held by the main heat exchanger is determined by the hot water derived through the main heat exchanger immediately after the combustion of the hot water supply burner is stopped. It becomes lower than the hot water that is drawn out through the main heat exchanger immediately after the combustion of the hot water supply burner is stopped (due to being robbed, etc.), but it is higher than the hot water supply set temperature.

Then, the hot water having a temperature higher than the hot water set temperature derived from the hot water heat exchanger side merges with the hot water set temperature led out through the bypass passage. As described above, the hot water supply The flow rate of hot water passing through the bypass passage side is larger than the flow rate of hot water passing through the hot water supply heat exchanger side, for example, by setting the bypass ratio between the hot water supply heat exchanger side and the bypass passage side to 1: 3.5 after the burner has stopped burning. By increasing the number, the temperature of the hot water that merges and exits the hot water supply circuit is higher than the hot water supply set temperature, but the temperature difference can be reduced (for example, it can be within an allowable range of 2 ° C or less). Hot water that is close to the hot water supply set temperature can be supplied from the hot water supply circuit.

Further, after the hot water having the first set capacity is introduced, hot water having a temperature higher than the hot water supply set temperature, which is a predetermined raising temperature, is introduced into the bypass passage side and the hot water supply heat exchanger side, respectively. For hot water having a temperature higher than the set temperature, the time required for returning to the hot water supply set temperature and the hot water supply flow rate after the detection temperature of the hot water supply heat exchange side temperature detecting means falls below the hot water supply set temperature. Only the second set capacity set based on the above will be introduced into the auxiliary heat source device.

Here, hot water having a temperature higher than the hot water supply set temperature introduced in the bypass passage is immediately derived through the bypass passage, but on the hot water supply heat exchanger side, at this time, when the hot water supply burner stops burning. The hot water in the latent heat recovery heat exchanger is led out through the main heat exchanger and merges with the hot water drawn out from the bypass passage.

Hot water at a temperature lower than the hot water supply set temperature that was in the latent heat recovery heat exchanger when the hot water supply burner stopped burning is slightly warmed by the residual heat amount when passing through the main heat exchanger, but the hot water supply set temperature Although the temperature is much lower than that of the hot water, the hot water drawn out through the bypass passage at this time is the hot water having a temperature higher than the hot water supply set temperature, so these hot waters are merged and supplied through the hot water supply circuit. It is possible to prevent the temperature of the hot water from becoming lower than the set temperature for hot water supply, and it is possible to supply hot water at almost the set temperature for hot water supply.

After that, by the time the introduction of the hot water of the second set capacity to the auxiliary heat source device is completed, on the hot water supply heat exchanger side, all the hot water held on the hot water supply heat exchanger side when the combustion of the hot water supply burner is stopped is the hot water supply circuit. After the hot water of the hot water supply set temperature sent from the main heat source to the auxiliary heat source device is derived through the hot water supply heat exchanger, the hot water having a temperature higher than the hot water supply set temperature is the hot water supply heat exchanger. It is derived through the hot water, and then the hot water at the hot water supply set temperature is derived.

On the other hand, on the bypass passage side, by the time the introduction of the hot water of the second set capacity into the auxiliary heat source device is completed, the hot water of the hot water supply set temperature sent from the main heat source to the auxiliary heat source device is led out through the bypass passage side. Therefore, the hot water set temperature derived from the hot water supply heat exchanger side or the hot water having a temperature higher than the hot water supply set temperature and the hot water having a hot water supply set temperature derived from the bypass passage side are, for example, 1: 3.5. The hot water is supplied by merging at a rate, and the temperature of the hot water supplied from the hot water supply circuit (hot water supply temperature) is slightly higher than the hot water supply set temperature or the hot water supply set temperature, but the hot water is supplied at a temperature close to the hot water supply set temperature. Will be done. From the above, in the auxiliary heat source device having the main heat exchanger and the latent heat recovery heat exchanger, not only the overshoot of the hot water supply temperature but also the undershoot can be accurately suppressed by the above configuration.

In the auxiliary heat source device, more specifically, in the configuration in which the hot water supply circuit has a passage from the hot water introduction port to the entrance of the bypass passage, and has a latent heat recovery heat exchanger and a main heat exchanger. , A passage between the inlet of the bypass passage and the inlet of the latent heat recovery heat exchanger, and a passage between the outlet of the main heat exchanger and the outlet of the bypass passage are generally formed. Hot water passes through the passages, but the capacity of each passage is usually smaller than the capacity of the hot water heat exchanger, and the effect is small.

Further, since the temperature of the hot water introduced into the heat source device fluctuates due to, for example, the difference in the outside air temperature due to the difference in seasons, the combustion of the hot water burner is stopped after the combustion of the hot water burner is started during the trial run. Even if the detection information of the hot water supply heat delivery side temperature detecting means is detected and the raising temperature is set based on the detection information, due to the difference in the hot water temperature introduced into the heat source device during the actual hot water supply operation, etc. As described above, even if the hot water supply temperature adjusting means sends the hot water of the first set capacity and then sends the hot water of the second set capacity as hot water having a temperature higher than the hot water supply set temperature, as described above. There is a possibility that the hot water supply temperature cannot be sufficiently stabilized.

On the other hand, the temperature control information setting means obtains the detection information of the hot water supply heat delivery side temperature detecting means after the combustion of the hot water supply burner that started burning at the start of hot water supply is stopped for each hot water supply operation of the heat source device or a predetermined hot water supply operation. The hot water supply is monitored every number of times or at each predetermined monitor timing for each predetermined set period, and the hot water supply in the temperature drop region where the detection temperature of the hot water supply heat delivery side temperature detecting means is lower than the hot water supply set temperature at the time of monitoring. When the temperature difference from the set temperature differs from the temperature difference from the hot water supply set temperature in the temperature drop region during the trial run beyond a predetermined allowable range, after the hot water supply operation following the hot water supply operation in which the monitoring is performed. By changing the raising temperature of the applied temperature control information according to a different degree beyond the allowable range of the temperature difference, it is possible to more reliably stabilize the hot water supply temperature.

The temperature difference from the hot water supply set temperature in the temperature drop region where the detection temperature of the hot water supply heat delivery side temperature detecting means is lower than the hot water supply set temperature at the time of the monitor is the hot water supply setting in the temperature drop region during the trial run. When the temperature difference from the temperature is larger than the allowable range of decrease (that is, when the temperature difference is large), the raising temperature is changed to increase, and conversely, when the temperature difference is larger than the allowable range (that is, when the temperature difference is large). In other words, when the temperature difference is small), change to a smaller temperature. By doing so, for example, the raising temperature can be changed in response to the difference in the temperature of the hot water introduced into the heat source device, so that the hot water supply temperature can be stabilized more reliably.

Further, the temperature difference from the hot water supply set temperature in the temperature drop region where the detection temperature of the hot water supply heat exchange side temperature detecting means is lower than the hot water supply set temperature during monitoring is the hot water supply set temperature in the temperature drop region during the trial run. When the temperature difference between the two and the above exceeds a predetermined allowable range, the auxiliary heat source device such as a water heater has been replaced, the neighboring house has been rebuilt and the installation environment has changed, and the auxiliary heat source device has been relocated. Since it is possible that the situation has changed due to this, perform the test run equivalent operation as described below and acquire the temperature control information.

In this trial run equivalent operation, the temperature difference from the hot water supply set temperature in the temperature drop region where the detection temperature of the hot water supply heat exchange side temperature detecting means is lower than the hot water supply set temperature during the monitor is the temperature drop region during the trial run. It is performed after the operation of the hot water supply operation, which is different from the temperature difference from the hot water supply set temperature in the above, exceeds a predetermined allowable range, and is performed last time based on the control of the combustion control means provided in the auxiliary heat source device. When the time until the hot water is discharged again is long, the hot water in the connection pipe connecting the main heat source side such as the hot water storage tank and the auxiliary heat source device side such as the water heater is cold and the water supply temperature introduced into the auxiliary heat source device This operation is performed at the start of hot water supply (cold start) when the temperature is low, and is equivalent to the test operation.

During this trial run equivalent operation, the temperature difference from the hot water supply set temperature is detected in the region where the detection temperature of the hot water supply heat delivery side temperature detecting means is lower than the hot water supply set temperature, and the temperature control information is set based on the detection information. The means is set as the temperature control information by the hot water supply temperature control means. As a result, the temperature control information is updated, and the first set capacity, the second set capacity, and the like are also updated. It is preferable to perform a test run including the test run equivalent operation (that is, when a test run equivalent operation is performed, this data is updated as data in the test run, and the updated data is compared with the data at the time of monitoring. Good to do).

Further, a hot water supply temperature detecting means for detecting the temperature of the hot water supplied through the hot water supply circuit as the hot water supply temperature is provided, and the temperature control information setting means is provided by the hot water supply temperature detecting means after the combustion of the hot water supply burner is stopped after the hot water supply is started. The detected hot water supply temperature is monitored for each hot water supply operation of the heat source device, each predetermined number of hot water supply operations, or each predetermined monitor timing for each predetermined set period, and the detection temperature of the hot water supply temperature detecting means is the hot water supply. When the temperature exceeds the preset allowable range and becomes different from the set temperature, the raising temperature of the temperature control information applied after the next hot water supply operation after the hot water supply operation performed by the monitor is changed and set ( When the detection temperature of the hot water supply temperature detecting means is higher than the allowable range of the hot water supply set temperature, the raising temperature is reduced, and when the detection temperature of the hot water supply temperature detecting means is lower than the allowable range of the hot water supply set temperature, the raising temperature is increased. However, in the same manner as described above, the raising temperature can be changed in response to the difference in the temperature of the hot water introduced into the heat source device, for example, so that the hot water supply temperature can be stabilized more reliably.

Further, on the hot water introduction side of the auxiliary heat source device in which the hot water supply heat exchanger has a main heat exchanger and a heat exchanger for latent heat recovery, a water supply passage is connected in addition to the passage of hot water discharged from the main heat source. If the length of the connection pipe connecting the main heat source and the hot water introduction side of the hot water supply circuit of the auxiliary heat source device is shorter than the preset length given in advance, from the start of hot water supply until the predetermined water introduction time elapses. During the period, water is introduced into the auxiliary heat source device from the water supply passage, and hot water discharged from the main heat source through the hot water passage after the water introduction time has elapsed is introduced into the auxiliary heat source device. As described below, even when the connection pipe is short, the hot water supply temperature can be stabilized even more accurately.

That is, when the length of the connection pipe is shorter than the preset length (for example, 4 m), even if the hot water supply burner of the auxiliary heat source device starts burning at the start of hot water supply, it is heated by the combustion of the hot water supply burner. The hot water in the hot water supply heat exchanger is heated to the hot water supply set temperature earlier than the hot water supply set temperature hot water sent from the main heat source reaches the hot water introduction side of the hot water supply circuit of the auxiliary heat source device, and the latent heat is recovered. When the temperature of the hot water in the heat exchanger is lower, the hot water of the hot water supply set temperature from the main heat source arrives. Therefore, even if the hot water of the hot water supply set temperature sent from the main heat source is passed mainly through the bypass passage side after the hot water supply burner is stopped, it passes through the hot water drawn out through the bypass passage and the hot water supply heat exchanger side. When the derived hot water merges, the temperature becomes lower than the set hot water supply temperature, and it may not be possible to properly stabilize the hot water supply temperature.

Therefore, after the hot water in the hot water supply heat exchanger heated by the combustion of the hot water supply burner is heated to the hot water supply set temperature or a temperature slightly higher than that, the hot water supply hot water set temperature sent from the main heat source is the auxiliary heat source. Depending on the time that the hot water in the main heat exchanger of the hot water supply heat exchanger is heated to the hot water supply set temperature and the length of the connection pipe so that it reaches the hot water introduction side of the hot water supply circuit of the device (that is, connection) The water introduction time is set (according to the amount of hot water passing through the water pipe), water is introduced from the water supply passage to the auxiliary heat source device until the water introduction time elapses, and the water introduction time elapses. After that, by introducing the hot water discharged from the main heat source through the hot water passage into the auxiliary heat source device, it is possible to surely stabilize the hot water supply temperature even when the connecting pipe is short.

Further, by providing a main heat source having a hot water storage tank, hot water formed by utilizing, for example, solar heat or exhaust heat of a fuel cell or the like can be stored in the hot water storage tank and used efficiently. Then, a mixing means for merging the hot water passage and the water supply passage discharged from the hot water storage tank of the main heat source having the hot water storage tank at the merging portion and mixing the merging hot water and water at the merging portion, and the mixing means. By providing a hot water introduction passage for introducing the hot water mixed and formed by the above into the auxiliary heat source device and controlling the mixing means to control the flow rate of the hot water flowing to the merging portion and the flow rate of the water, the merging portion The temperature of the hot water formed by the above and sent to the auxiliary heat source device side can be appropriately controlled, and the hot water supply temperature can be stabilized by the above effect.

It is a block diagram which shows the control structure of one Example of the heat source apparatus which concerns on this invention. It is explanatory drawing for demonstrating the system configuration example of the heat source apparatus of an Example. It is a graph which shows the time change example of the hot water supply heat exchanger outlet temperature, the hot water supply circuit inlet temperature, and the hot water supply temperature after the hot water supply burner combustion is stopped at the time of hot water supply of the heat source apparatus of the Example. The amount of heat of the hot water introduced into the bypass passage after the hot water supply burner combustion is stopped during the hot water supply of the heat source device of the embodiment and the hot water held by the hot water supply heat exchanger when the hot water supply burner is stopped are derived after the hot water supply burner is burned. The amount of heat on the outlet side of the hot water supply heat exchanger and the hot water from the main heat source after the hot water supply burner has stopped burning are introduced into the hot water supply heat exchanger and led out through the hot water supply heat exchanger. It is a schematic graph for demonstrating the time change example of the heat quantity of the output side and the addition amount of these heat quantities. An example of temporal changes in the amount of heat and the amount of heat added shown in FIG. 4 is the case where the temperature of the hot water sent from the hot water storage tank to the water heater is kept constant as the hot water supply set temperature during hot water supply of the heat source device under development. It is a schematic graph for demonstrating. It is explanatory drawing for demonstrating the system configuration example of the heat source apparatus under development. It is explanatory drawing which shows typically the distribution example of the temperature layer in a hot water storage tank.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of this embodiment, the same components as those of the examples described so far are designated by the same reference numerals, and the duplicated description thereof will be omitted or simplified.

FIG. 1 shows a main part control configuration of an embodiment of the heat source device according to the present invention by a block diagram, and FIG. 2 shows the system configuration. As shown in FIG. 2, the heat source device of this embodiment has almost the same system configuration as the heat source device shown in FIG. 6, but the heat source device of this embodiment supplies hot water to the water heater 16. A water supply temperature detecting means 71 for detecting the temperature of the hot water introduced into the hot water introduction side of the circuit 62 is provided, and further has a characteristic control configuration shown in FIG.

As shown in the figure, the control device 46 of the water heater 16 includes a combustion control means 47, a memory unit 73, and a bypass servo control means 74, and the combustion control means 47 is a hot water supply set temperature setting operation means 45. It is connected to the remote control device 43 provided with. The remote controller 43 is installed indoors in an appropriate place such as a living room, a bathroom, a kitchen, or a washroom.

Further, in the present embodiment, the control device 33 in the tank unit 4 is provided with the mixing flow rate control means 35, the hot water supply temperature control means 36, the memory unit 37, and the temperature control information setting means 38. Is signal-connected to the remote control device 43 and the control device 46.

The hot water supply set temperature setting operation means 45 is an operation means for setting the hot water supply set temperature by a user or the like, and is formed by, for example, an operation button provided on the surface side of the remote controller device 43. The value of the hot water supply set temperature set by the hot water supply set temperature setting operation means 45 is the combustion of the hot water supply temperature control means 36 of the control device 33 of the tank unit 4, the temperature control information setting means 38, and the control device 46 of the water heater 16. It is added to the control means 47.

The flow rate detecting means 42 detects the hot water supply flow rate supplied through the hot water supply passage 19, and adds the detected flow rate (detected value) of the hot water supply flow rate to the combustion control means 47 of the control device 46. Further, the water supply flow rate sensor 29 also detects the hot water supply flow rate supplied through the hot water supply passage 19, and adds the detected flow rate (detection value) of the hot water supply flow rate to the mixing flow rate control means 35 of the control device 33.

In the combustion control means 47, the hot water in the connecting pipe connecting the hot water storage tank 2 side and the water heater 16 side is cold, such as when the heat source device is operated for the first time or when it takes a long time to re-deliver hot water after the previous hot water supply. Flow rate detecting means 42 at the start of hot water supply (cold start) when the water supply temperature introduced into the water heater 16 is low, or at the start of hot water supply for re-delivery when the hot water supply set temperature is changed significantly after the hot water supply is stopped. The hot water supply burner 61 is configured to start burning when the hot water supply flow rate detected by the above reaches the minimum operating flow rate for combustion of the hot water supply burner 61. Then, the combustion of the hot water supply burner 61 is stopped at the determination timing described later.

In this embodiment, the water heater 16 is burn-controlled so that the temperature of the hot water that passes through the hot water supply heat exchanger 17 and exits from the hot water supply heat exchanger 17 becomes a heat exchange reference temperature (for example, 60 ° C.) that is obtained in advance. The combustion of the hot water supply burner 61 is controlled by the means 47, and the ratio of the hot water of the heat exchange reference temperature discharged from the hot water supply heat exchanger 17 and the hot water of the hot water of the heat exchange reference temperature merging through the bypass passage 68 is bypassed. It has a hot water supply temperature control configuration that controls so that hot water in the hot water supply heat exchanger is supplied by varying by controlling the bypass servo 69 under the control of the servo control means 74.

That is, the bypass servo control means 74 takes in the hot water supply set temperature setting information by the hot water supply set temperature setting operation means 45 and the control information of the combustion control means 47 during the combustion of the hot water supply burner 61, and exits from the hot water supply heat exchanger 17. The ratio of the hot water of the heat exchange reference temperature to the hot water that joins the hot water through the bypass passage 68 is changed by the control of the bypass servo 69, and the hot water of the heat exchange reference temperature and the hot water passing through the bypass passage are mixed. To form hot water at a set temperature for hot water supply.

In this way, for example, hot water having a set temperature for hot water supply is formed by changing the temperature of the hot water discharged from the hot water supply heat exchanger 17 while keeping the mixing ratio of the hot water passing through the hot water supply heat exchanger 17 and the hot water passing through the bypass passage 68 substantially constant. The amount of heat possessed by the hot water supply heat exchanger 17 can be set to a substantially constant value as compared with the heat exchanger. In the configuration in which the temperature of the hot water discharged from the hot water supply heat exchanger 17 is changed to form hot water at the hot water supply set temperature, the amount of heat possessed by the hot water supply heat exchanger 17 may or may not be substantially constant. It changes depending on the temperature of the hot water discharged from the hot water supply heat exchanger 17 (the temperature of the hot water formed by being heated by the hot water supply heat exchanger 17), and when the temperature of the hot water discharged from the hot water supply heat exchanger 17 becomes high, the hot water supply heat exchange The amount of heat held by the hot water supply heat exchanger 17 changes, such that the amount of heat held by the container 17 also increases.

Further, in the present embodiment, after the hot water supply burner 61 is stopped, the bypass servo control means 74 is introduced into, for example, the hot water supply circuit 62 so that the distribution ratio to the bypass passage 68 side becomes the maximum within the ratio change range. The hot water is passed through at a ratio of 1: 3.5 between the hot water supply heat exchanger 17 side and the bypass passage 68 side.

The temperature control information setting means 38 of the control device 33 is the temperature on the hot water supply heat discharge side after the combustion of the hot water supply burner 61 is stopped after the combustion of the hot water supply burner 61 is started during the hot water supply operation in the trial run mode in which the heat source device is commissioned. The detection information of the detection means 67 is detected, the factors described below in the temperature control information by the hot water supply temperature control means 36 are set based on the detection information, and the set values are stored in the memory unit 37.

That is, the temperature control information setting means 38 detects the detection information of the hot water supply heat exchange side temperature detection means 67 during the hot water supply operation in the trial operation mode via the combustion control means 47 of the water supply device 16, and the hot water supply heat exchange side. The first set capacity based on the time required from when the hot water supply burner 61 is stopped until the temperature detected by the temperature detecting means 67 drops below the hot water supply set temperature and the hot water supply flow rate, and the detection temperature of the hot water supply heat exchange side temperature detecting means 67. The second set capacity based on the time required to return to the hot water supply set temperature and the hot water supply flow rate after the temperature drops below the hot water supply set temperature, and the temperature on the outlet side of the main heat exchanger 17a are lower than the hot water supply set temperature. The raising temperature based on the temperature characteristics until the temperature returns to the hot water supply set temperature is set as the temperature control information of the hot water supply temperature adjusting means 36, and is stored in the memory unit 37.

As an example, after the hot water supply burner 61 is started to burn and burned so that the detection temperature of the hot water supply heat exchanger outlet side temperature detecting means 67 becomes 60 ° C. during the hot water supply operation in the trial run mode in which the heat source device is commissioned. When the temperature detected by the hot water supply heat exchange side temperature detecting means 67 after the combustion of the hot water supply burner 61 is stopped is the characteristic shown in the characteristic line a of FIG. 3, the temperature shown in the characteristic line a is the hot water supply burner 61. The first set capacity is set to, for example, 1 liter by a value obtained by correcting the capacity obtained based on the time t1'and the hot water supply flow rate required from the time of stopping until the temperature drops below the hot water supply set temperature (40 ° C. in this case). The time for the hot water of the first set capacity to flow in the water heater 16 is t1. In addition, in the test run mode in which the test run of the heat source device is performed, the test run without the hot water supply operation may be performed because the gas or the like is not supplied in time. In such a case, the first test run equivalent operation is used. Set the set capacity and the second set capacity described below.

Further, the second set capacity is, for example, 6 based on a value obtained by correcting the capacity obtained based on the time t2'and the hot water supply flow rate required to return to the hot water supply set temperature after the temperature falls below the temperature hot water supply set temperature shown in the characteristic line a. Set to liter. The time for the hot water of the second set capacity to flow in the water heater 16 is t2. Then, the raising temperature Tu is set to, for example, 4 ° C. based on the temperature characteristics until the temperature shown on the characteristic line a returns to the hot water supply set temperature after the temperature drops below the hot water supply set temperature.

The mixing flow rate control means 35 controls the tank-side solenoid valve 13, the tank hot water mixer 12, and the water mixer 14, so that the flow rate of hot water flowing from the hot water outlet 9 to the confluence 10 side and the confluence 10 from the water supply passage 8b. The flow rate of the water flowing to the side is controlled so that the mixed hot water of the set mixed temperature set by the hot water temperature adjusting means 36 is formed at the confluence portion 10.

The hot water supply temperature adjusting means 36 is a set temperature of mixed hot water formed by mixing hot water discharged from the hot water storage tank 2 and hot water from the water supply passage 8b based on the temperature control information set by the temperature control information setting means 38. By setting (mixing set temperature) and adding a command to the mixing flow rate control means 35 so that hot water having the set mixed hot water temperature is formed, the temperature is sent from the hot water storage tank 2 side to the hot water supply circuit 62 side of the water heater 16. It regulates the temperature of hot water.

In this embodiment, when hot water supply is started, hot water having a hot water supply set temperature is sent from the hot water storage tank 2 side to the hot water supply circuit side of the water heater 16, and at the same time, as described above, the water heater 16 is burned. The control means 47 starts the combustion of the hot water supply burner 61 and heats the hot water passing through the hot water supply circuit by the hot water supply heat exchanger 17 to supply hot water. The combustion control means 47 is a means for detecting the temperature of the hot water supply every moment during this combustion control. The detection temperature of 71 is taken in, and when the detection temperature exceeds a predetermined water supply limit temperature, the combustion of the hot water supply burner 61 is stopped (the gas on-off valve 48 shown in FIG. 1 is closed, and the combustion fan is also used. Perform appropriate control such as stopping the water heater). Even if the combustion of the hot water supply burner 61 is stopped, the hot water sent from the hot water storage tank 2 side is sent to the hot water supply destination through the hot water supply circuit 62, and the hot water supply is continued.

In this embodiment, the information for obtaining the water supply limit temperature is stored in the memory unit 73, and the water supply limit temperature is the hot water supply set temperature, the detection temperature of the hot water supply heat delivery side temperature detecting means 67, and the bypass ratio change. It is obtained in advance by, for example, the following equation (1), based on the maximum value (maximum bypass ratio) of the bypass ratio to the bypass passage side in the range. Since the temperature on the outlet side of the hot water supply heat exchanger (detection temperature of the hot water supply heat exchange side temperature detecting means 67) is higher than the hot water supply set temperature, as can be seen from this equation (1), the water supply limit temperature. Is a temperature lower than the hot water supply set temperature.

Water supply limit temperature = hot water supply set temperature + (hot water supply set temperature-hot water supply heat delivery side temperature detection means detection temperature) / maximum bypass ratio ... (1)

As an example, the hot water supply set temperature is 40 ° C., the detection temperature of the hot water supply heat exchange side temperature detecting means is 60 ° C., and the maximum bypass ratio is 3.5 (bypass ratio to the hot water supply heat exchanger side: bypass passage side). When the bypass ratio is 1: 3.5), the water supply limit temperature is 40+ (40-60) /3.5≈34.3, which is about 34.3 ° C. That is, in this embodiment, the low-temperature hot water (which was stopped in the pipe between the hot water storage tank 2 and the water heater 16) was shortly before the hot water of the hot water supply set temperature reached the water heater 16 from the hot water storage tank 2 side. (At the timing when the hot water at the water heater limit temperature, which is near the boundary between the water) and the hot water of the hot water supply set temperature sent from the hot water storage tank 2 side and before the boundary (closer to the water heater 16), reaches the water heater 16) Burning will be stopped.

In this embodiment, when hot water supply is started, hot water having a hot water supply set temperature is sent from the hot water storage tank 2 side to the hot water supply circuit 62 side of the water heater 16 as described above, but at the time of the cold start or after the hot water supply stop. At the start of hot water supply such as re-delivery when the hot water supply set temperature is changed significantly higher, the hot water supply temperature control means 36 has the characteristics described below as the temperature of the hot water sent from the hot water storage tank 2 side to the water heater 16 side. I try to keep the temperature at a high level.

That is, in this embodiment, the values of the first set capacity, the second set capacity, and the raising temperature are set by the temperature control information setting means 38 and stored in the memory unit 37, and the hot water supply temperature control means 36 Based on these values and the flow rate detection value by the water supply flow rate sensor 29, the temperature of the hot water sent from the hot water storage tank 2 side to the hot water supply circuit 62 side of the water heater 16 is determined by the capacity (integrated flow rate) of the hot water from the start of hot water supply. Until the first set capacity is reached, the hot water supply set temperature is set to a temperature higher than the hot water supply set temperature from the time when the first set capacity is reached until the second set capacity is reached, and the second setting is performed. After reaching the capacity, the hot water supply set temperature is set.

In the explanation described below, unless otherwise specified, the start of hot water supply means the re-delivery of hot water in the above cases, that is, when the set temperature of hot water supply is changed significantly higher at the time of cold start or after the stop of hot water supply. It refers to the start of hot water supply, and excludes the start of hot water supply in which hot water is re-delivered shortly after the hot water supply is stopped without a major change in the hot water supply set temperature.

That is, when the time from the previous stop of hot water supply is short and there is no change to significantly increase the hot water supply set temperature, at the start of hot water supply at the time of re-delivery, the hot water in the hot water supply circuit 62 of the water heater 16 or the hot water storage tank 2 and the water heater The hot water in the connecting pipeline connecting the water heater 16 is the hot water supply set temperature sent from the hot water storage tank 2 side or a temperature close to the hot water supply set temperature. In such a case, the hot water supply burner 61 of the water heater 16 is also burned. Instead, the temperature setting of the hot water sent from the hot water storage tank 2 side to the water heater 16 side by the hot water supply temperature adjusting means 36 does not change according to the time as described above, and the hot water temperature in the hot water storage tank 2 is higher than the threshold value. If it is a temperature, for example, it is set to the same value as the value of the hot water supply set temperature or a temperature higher than that, such as 0.5 ° C.

When the detection temperature of the hot water temperature detecting means 5a in the hot water storage tank is equal to or less than the threshold value, the hot water supply temperature adjusting means 36 sets, for example, the mixing set temperature to an appropriate temperature lower than the hot water supply set temperature. In that case, the low temperature hot water is additionally heated by the water heater 16. Further, when the detection temperature of the hot water temperature detecting means 5a in the hot water storage tank is equal to or lower than the threshold value, the hot water supply set temperature is controlled by heating the water from the water supply passage 8b with the water heater 16 without sending hot water from the hot water storage tank 2 side. In some cases, hot water is supplied.

The mixing flow rate control means 35 opens the tank-side electromagnetic valve 13 when the hot water supply flow rate of hot water supplied through the hot water supply passage 19 is detected by the water supply flow rate sensor 29, and is controlled by the tank hot water mixer 12 and the water mixer 14. By controlling the flow rate of hot water and the flow rate of water, the temperature of the mixed hot water formed at the confluence 10 is set to the mixed set temperature set by the hot water supply temperature adjusting means 36, and the hot water temperature in the hot water storage tank is set. At the start of hot water supply when the detection temperature of the detection means 5a is higher than the threshold value, the temperature is controlled to be the hot water supply set temperature (or a temperature higher than the hot water supply set temperature by 0.5 ° C.).

Since the hot water formed by this control is introduced into the hot water supply circuit 62 of the water heater 16 through the passage 18 and the hot water introduction passage 15, it is not necessary to reheat the hot water on the water heater 16 side. It takes time for this hot water to reach the water heater 16 side, and during that time, it is necessary to heat the water in the passage in the hot water supply circuit 62 and the hot water introduction passage 15 of the water heater 16 with the hot water heat exchanger 17. As described above, the water in the passage in the hot water supply circuit 62 and the hot water introduction passage 15 is heated by the hot water supply heat exchanger 17 by the combustion of the hot water supply burner 61.

Then, the combustion control means 47 monitors the detection value of the water supply temperature detecting means 71 every moment during the combustion control of the hot water supply burner 61, and the detected value (detection temperature) is the water supply limit temperature (hot water supply set temperature and hot water supply heat). When the temperature exceeds the value obtained in advance by the detection temperature of the delivery side temperature detecting means 67 and the maximum value of the bypass ratio to the bypass passage 68 side in the bypass ratio change range, which is lower than the hot water supply set temperature). The combustion of the hot water supply burner 61 is stopped. By stopping the combustion of the hot water supply burner 61, extra heating is not performed, and it is possible to prevent overshoot of the hot water supply temperature.

By the way, in this embodiment, the hot water supply heat exchanger 17 of the water heater 16 has a main heat exchanger 17a and a latent heat recovery heat exchanger 17b, and the combustion of the hot water supply burner 61 is stopped after the start of hot water supply. When this is done, the hot water in the heat exchanger 17b for latent heat recovery is heated to some extent by absorbing the latent heat of the combustion gas of the hot water supply burner 61 during the combustion of the hot water supply burner 61, but it is higher than the hot water supply set temperature. It is a fairly low temperature.

Therefore, when the water heater 16 provided with the heat source device latent heat recovery heat exchanger 17b under development is applied, the hot water in the latent heat recovery heat exchanger 17b is supplied after the combustion of the hot water supply burner 61 is stopped. In order to prevent the resulting undershoot of the hot water supply temperature, in this embodiment, the characteristic temperature control is performed by the hot water supply temperature adjusting means 36 as described above. Hereinafter, stabilization of the hot water supply temperature after the combustion of the hot water supply burner 61 is stopped due to this characteristic temperature control will be described with reference to FIGS. 3 to 5.

In FIGS. 3 to 5, the hot water supply set temperature is set to 40 ° C., the hot water supply flow rate is set to 8 liters / minute, and after the combustion of the hot water supply burner 61 that started combustion at the start of hot water supply is stopped (detection of the hot water supply temperature detecting means 71). The experimental data obtained for the temperature change (after the hot water supply burner combustion is stopped) when the temperature exceeds the water supply limit temperature and the analysis data thereof are shown.

As described above, the characteristic line a of FIG. 3 shows the detection temperature of the hot water supply heat exchange side temperature detecting means 67, the characteristic line b is the temperature of the hot water introduced from the hot water storage tank 2 to the water heater 16, and the characteristic line c is. The hot water supply temperature of the heat source device of this embodiment (the hot water supply temperature of the hot water supplied through the water heater 16) is shown, and the characteristic line d shows the hot water supply flow rate. Although the hot water supply flow rate is set to 8 liters / minute even during the combustion of the hot water supply burner 61, the characteristic line d in FIG. 3 shows the hot water supply flow rate of the hot water sent from the hot water storage tank 2 (the flow rate of the hot water introduced into the hot water supply circuit 62). Is shown, and the hot water supply flow rate during combustion of the hot water supply burner 61 before the hot water from the hot water storage tank 2 arrives is described as 0. The time when the hot water supply flow rate rises from 0 indicates the timing at which the hot water sent from the hot water storage tank 2 at the hot water supply set temperature is introduced into the water heater 16 slightly later than the combustion stop timing of the hot water supply burner 61.

Further, in FIG. 4, the characteristic line a indicates the hot water supply temperature, and the characteristic line b in FIG. 4 (b) and the region b in FIG. 4 (a) are the amount of heat on the entry side of the bypass passage 68, FIG. 4 (b). In the characteristic line c of the above and the region c of FIG. 4A, the hot water in the hot water supply heat exchanger 17 (main heat exchanger 17a and latent heat recovery heat exchanger 17b) when the combustion of the hot water supply burner 61 is stopped is the hot water supply burner. After the combustion of 61 is stopped, the amount of heat on the outlet side of the hot water supply heat exchanger 17 by being led out from the hot water supply heat exchanger 17 in the order of the main heat exchanger 17a and the latent heat recovery heat exchanger 17b, FIG. 4 (b). In the characteristic line d and the region d in FIG. 4A, the hot water from the hot water storage tank 2 introduced into the hot water supply heat exchanger 17 after the combustion of the hot water supply burner 61 is stopped passes through the hot water supply heat exchanger 17 and the hot water supply heat exchanger 17 The amount of heat on the outlet side of the hot water supply heat exchanger 17 derived from is shown.

The characteristic lines b to c in FIG. 4B show each calorific value individually, and in FIG. 4A, the calorific value is added as a region, and the details will be described later. Is also calculated as a value corresponding to the temperature of hot water, not as a general unit indicating the amount of heat, and the points shown by A in FIGS. 4A and 4B correspond to the set temperature of hot water supply.

In this embodiment, after the hot water supply burner 61 is burned at the start of hot water supply as described above, the combustion of the hot water supply burner 61 is stopped when the detection temperature of the water supply temperature detecting means 71 becomes equal to or higher than the water supply limit temperature. At this time, the hot water in the bypass passage 68 is unheated hot water at a lower temperature. On the other hand, in the main heat exchanger 17a of the hot water supply heat exchanger 17, the temperature of the hot water on the outlet side is approximately 60 ° C., and the temperature on the inlet side is slightly lower than the temperature on the outlet side. The temperature of the hot water in the latent heat recovery heat exchanger 17b is considerably lower than that temperature.

Immediately after the hot water supply burner 61 stops burning, the main heat exchanger 17a of the hot water supply heat exchanger 17 remains hot, and when the hot water supply burner 61 stops burning, the hot water bypass passage 68 side introduced into the hot water supply circuit 62 When the branching ratio (corresponding to the bypass ratio) to is increased, the flow rate of hot water passing through the main heat exchanger 17a in the hot state becomes smaller than that during the combustion of the hot water supply burner 61, which is shown in the characteristic line a in FIG. As described above, the temperature of the hot water derived from the main heat exchanger 17a becomes higher than 60 ° C. after the combustion of the hot water supply burner 61 is stopped, and the hot water at the higher temperature is derived through the main heat exchanger 17a. After that, the temperature of the hot water derived from the main heat exchanger 17a gradually decreases as compared with immediately after the combustion of the hot water supply burner 61 is stopped.

After that, when all the hot water of the amount of water held in the main heat exchanger 17a was derived when the combustion of the hot water supply burner 61 was stopped, the hot water in the latent heat recovery heat exchanger 17b when the combustion of the hot water supply burner 61 was stopped was discharged. Since it is derived, the temperature of the hot water is considerably lower than the set temperature of the hot water supply. In the characteristic line c of FIG. 4B, the amount of heat of hot water due to the hot water held by the hot water supply heat exchanger 17 when the combustion of the hot water supply burner 61 is stopped is derived from the hot water supply heat exchanger 17 side. It is indicated by a value corresponding to the temperature, and this value is based on the hot water supply heat exchange outlet temperature shown in the characteristic line a of FIG. 3, and the hot water supply heat exchange outlet temperature × the branching rate on the hot water supply heat exchanger 17 side (here). Then, it is obtained by 0.22).

On the other hand, when the combustion of the hot water supply burner 61 is stopped, the hot water in the bypass passage 68 is unheated hot water at a low temperature, but the capacity of the bypass passage 68 is, for example, 0.06 liters, which is the capacity of the hot water supply heat exchanger 17. The branch ratio (bypass ratio) is 1: 3, which is smaller than that and is introduced into the hot water supply circuit 62 of the water heater 16 after the combustion of the hot water supply burner 61 is stopped and branched into the hot water supply heat exchanger 17 side and the bypass passage 68 side. Since it is set to .5, the low temperature hot water that was in the bypass passage 68 when the combustion of the hot water supply burner 61 is stopped immediately passes through the bypass passage 68 and is derived from the bypass passage 68. After that, in the bypass passage 68, a little later than the stop timing of the hot water supply burner 61 (after the lapse of a time difference between the stop timing of the hot water supply burner 61 and the arrival timing of the hot water from the hot water storage tank 2 to the water heater 16), the hot water storage tank The hot water that has reached the water heater 16 is introduced from No. 2, and the hot water is led out through the bypass passage 68, but the time for passing through the bypass passage 68 is short as described above.

That is, the characteristic line b of FIG. 4B shows the amount of heat of the hot water introduced into the bypass passage 68 by a value corresponding to the temperature of the hot water, and this value is from the hot water storage tank 2 side to the water heater 16. It is obtained by multiplying the temperature of the hot water introduced into the hot water supply circuit 62 by the branching rate on the bypass passage 68 side (0.78 in this case), but this amount of heat is almost the same as the amount of heat on the exit side of the bypass passage 68. Strictly speaking, the amount of heat of hot water derived through the bypass passage 68 is a value delayed by the delay time obtained by the capacity of the bypass passage 68 ÷ the hot water supply flow rate ÷ the branching rate on the bypass passage 68 side, but the bypass When the capacity of the passage 68 is 0.06 liters, 0.06 liters ÷ 8 (liters / minute) ÷ 0.78 ≒ 0.01 minutes = 0.6 seconds) Delay value (0.6 seconds shifted to the right) Since it is data), it is almost the same as the characteristic line b.

Further, on the characteristic line d of FIG. 4B, hot water from the hot water storage tank 2 introduced into the hot water supply heat exchanger 17 after the combustion of the hot water supply burner 61 is stopped passes through the hot water supply heat exchanger 17 and is supplied to the hot water supply heat exchanger 17. The amount of heat on the outlet side of the hot water supply heat exchanger 17 derived from is shown, and this value is the temperature of the hot water introduced into the hot water supply circuit 62 of the hot water supply device 16 × the branching rate on the hot water supply heat exchanger 17 side. It takes the value obtained in (0.22 here) until the hot water is led out through the latent heat recovery heat exchanger 17b and the main heat exchanger 17a and merges with the hot water led out from the bypass passage 68. It is delayed by the time (shifted to the right). This delay time td is (the amount of water retained in the latent heat recovery heat exchanger 17b + the amount of water retained in the main heat exchanger 17a) ÷ the hot water supply flow rate ÷ the branching rate on the hot water supply heat exchanger 17 side, and is (0.7 liter + 0). .6 liters) ÷ (8 liters / minute) ÷ 0.22 ≈ 0.74 minutes = 44 seconds.

In this embodiment, in the hot water supply circuit 62 of the water heater 16, the hot water led out from the bypass passage 68 side and the hot water drawn out from the hot water supply heat exchanger 17 side merge and are discharged from the hot water supply circuit 62. Therefore, the hot water supply temperature is a value corresponding to the total heat quantity of the heat quantity on the outlet side of the bypass passage 68 and the heat quantity on the outlet side of the hot water supply heat exchanger side 17. That is, by adding the amount of heat shown in the characteristic lines b to c of FIG. 4B, the amount of heat shown in FIG. 4A is obtained, and each amount of heat shown in FIG. 4 is described above. Since it was obtained as a value corresponding to the temperature of the hot water as described above, the amount of heat shown in the characteristic lines b to c of FIG. 4 (b) is shown in the regions b to d of FIG. 4 (a). The added value is the hot water supply temperature as shown by the characteristic lines a in FIGS. 4 (a) and 4 (b).

As is clear from these figures, in this embodiment, immediately after the combustion of the hot water supply burner 61 is stopped, hot water and a bypass passage having a temperature higher than the hot water supply set temperature derived from the hot water supply heat exchanger 17 side. Since the unheated hot water derived through 68 merges and exits from the hot water supply circuit 62, the hot water supply set temperature is almost reached, and then a temperature higher than the hot water supply set temperature derived from the hot water supply heat exchanger 17 side. Since the hot water of the hot water merges with the hot water of the hot water supply set temperature led out through the bypass passage 68 at a ratio of 1: 3.5 (ratio corresponding to the bypass ratio), the above-mentioned from the combustion stop of the hot water supply burner 61. Until the time (t1) until the hot water of the first set capacity is introduced into the water heater 16 elapses, the hot water is slightly higher than the hot water supply set temperature, but the hot water of almost the hot water supply set temperature is gradually supplied. The temperature of the hot water drops and hot water of almost the set temperature is supplied from the hot water supply circuit.

Then, after the lapse of time t1, the bypass passage 68 and the hot water heat exchanger 17 are connected to each other until the time (t2) until the hot water of the second set capacity is introduced into the water heater 16 elapses. , Hot water having a temperature higher than the hot water supply set temperature is introduced, and the hot water introduced into the bypass passage 68 is immediately led out through the bypass passage 68, but at this time, the hot water heat exchanger is still used. On the 17 side, hot water having a temperature lower than the hot water supply set temperature in the latent heat recovery heat exchanger 17b when the combustion of the hot water supply burner 61 is stopped is led out through the main heat exchanger 17a. Therefore, by merging the hot water with a lower temperature and the hot water with a temperature higher than the hot water supply set temperature derived from the bypass passage 68 at a ratio of 1: 3.5, the hot water supply setting is higher than the hot water supply set temperature. Hot water having a temperature close to the temperature is supplied (see the characteristic lines b and c in FIG. 4B and the regions b and c in FIG. 4A).

Further, when the time t2 elapses, all the hot water held on the hot water supply heat exchanger 17 side when the hot water supply burner 61 stops burning is supplied through the hot water supply circuit 62 and sent from the hot water storage tank 2 to the water heater 16. After the hot water of the hot water supply set temperature is derived through the hot water supply heat exchanger 17, the hot water having a temperature higher than the hot water supply set temperature is derived through the hot water supply heat exchanger 17, and then the hot water of the hot water supply set temperature is derived. Is derived (see characteristic line d in FIG. 4B).

Further, on the bypass passage 68 side, when the time t2 elapses, hot water of the hot water supply set temperature sent from the hot water storage tank 2 to the water heater 16 is led out through the bypass passage 68 side (FIG. 4B). (Refer to the characteristic line b), the hot water set temperature derived from the hot water supply heat exchanger 17 side or the hot water having a raising temperature higher than the hot water supply set temperature and the hot water set temperature derived from the bypass passage 68 side. For example, hot water is supplied by merging at a ratio of 1: 3.5, and hot water is supplied at a hot water supply set temperature or a hot water supply set temperature that is slightly higher than the hot water supply set temperature (characteristic of FIG. 4 (b)). Lines b to d and the addition area of regions b to d in FIG. 4 (a)). As described above, in this embodiment, the hot water supply temperature can be set to a substantially stable temperature, and can be used very comfortably.

The hot water supply temperature is set to a substantially stable temperature by adjusting the combustion stop timing of the hot water supply burner 61 of the water heater 16 as described above for the reception of hot water sent from the hot water storage tank 2 to the water heater 16 by the water heater 16. However, the amount of heat held at the hot water supply burner combustion stop timing of the hot water supply heat exchanger 17 increases, for example, as the temperature of the hot water discharged from the hot water supply heat exchanger 17 increases, so that, for example, for receiving hot water sent from the hot water storage tank 2. It is preferable to change the raising temperature (temperature Tu) of the hot water sent from the hot water storage tank 2 to the hot water supply 16 according to the amount of heat held by the hot water supply heat exchanger 17 at the corresponding combustion stop timing of the hot water supply burner 61.

For example, the amount of heat held by the hot water supply heat exchanger 17 is transmitted from the control device 46 side of the water heater 16 to the control device 33 side of the tank unit 4, and the temperature control information setting on the control device 33 side is set according to the amount of heat held. The means 38 may be set.

Further, as in the present embodiment, the temperature of the hot water discharged from the hot water supply heat exchanger 17 is fixed to be substantially constant, and the hot water having the heat exchange reference temperature discharged from the hot water supply heat exchanger 17 and the hot water pass through the bypass passage 68. When the ratio of the hot water to be merged is changed by the control of the bypass servo 69 and the hot water of the heat exchange reference temperature and the hot water passing through the bypass passage are mixed to form the hot water of the hot water supply set temperature, the hot water supply heat exchanger The amount of heat retained in 17 can be set to a substantially constant value.

Therefore, the value of the retained heat of the hot water supply heat exchanger 17 can be grasped in advance on the control device 33 side (for example, it can be stored in the memory unit 37 in advance), and the retained heat of the hot water supply heat exchanger 17 can be supplied with hot water. It is possible to omit the control of transmitting the heat from the control device 46 side of the device 16 to the control device 33 side of the tank unit 4 and setting the raising temperature by the temperature control information setting means 38, and also saves the trouble of adjusting the combustion stop timing. As described above, the hot water supply temperature can be easily set to a substantially stable temperature.

Note that FIG. 5 shows, as a comparative example of this embodiment, from the hot water storage tank 2 after the start of hot water supply, without providing the control configuration of the hot water supply temperature adjusting means 36 characteristic of this embodiment in the heat source device under development. Hot water supply temperature characteristics (characteristic lines a in FIGS. 5 (a) and 5 (b)) and calorific value characteristics (regions b to d in FIG. 5 (a)) when the temperature of hot water sent to the water heater 16 side is always set to the hot water supply set temperature. And the characteristic lines b to d) of FIG. (B) are shown respectively.

Specifically, the characteristic line b in FIG. 5 (b) and the region b in FIG. 5 (a) are the amount of heat on the entry side of the bypass passage 68, the characteristic line c in FIG. 5 (b) and the region in FIG. 5 (a). c is the amount of heat on the outlet side of the hot water supply heat exchanger 17 due to the hot water in the hot water supply heat exchanger 17 being drawn out from the hot water supply heat exchanger 17 after the hot water supply burner 61 has stopped burning. In the characteristic line d of 5 (b) and the region d of FIG. 5 (a), hot water from the hot water storage tank 2 is introduced into the hot water heat exchanger 17 and passes through the hot water heat exchanger 17 after the combustion of the hot water burner 61 is stopped. The amount of heat on the outlet side of the hot water supply heat exchanger 17 derived from the hot water supply heat exchanger 17 is shown.

As is clear from these figures, in the heat source device under development, the water is sent from the hot water storage tank 2 to the water heater 16 side after the start of hot water supply without providing the control configuration of the hot water supply temperature adjusting means 36 characteristic of this embodiment. When the temperature of the hot water is always set to the set temperature for hot water supply, a large undershoot occurs in the hot water supply temperature, whereas in this embodiment, the combustion of the hot water supply burner 61 is stopped at an accurate timing as described above. In addition to being able to suppress the occurrence of overshoot of the hot water supply temperature, the characteristic control configuration of the hot water supply temperature adjusting means 36 can also suppress the occurrence of undershoot of the hot water supply temperature, making it extremely comfortable to use. can do.

The present invention is not limited to the above-described embodiment, and various aspects can be adopted without departing from the technical scope of the present invention. For example, in the above embodiment, the temperature control information setting means 38 is provided in the control device 33 of the tank unit 4, but the temperature control information setting means 38 may be provided in the control device 46 of the water heater 16.

Further, the temperature control information setting means 38 transmits the detection information of the hot water supply heat supply side temperature detecting means 67 after the combustion of the hot water supply burner 61 is stopped after the start of combustion of the hot water supply burner 61 for each operation of the heat source device or. By monitoring at each predetermined number of hot water supply operations or at each predetermined monitor timing for each predetermined set period, the detection temperature of the hot water supply heat delivery side temperature detecting means 67 is lower than the hot water supply set temperature at the time of monitoring. When the temperature difference from the hot water supply set temperature in the temperature drop region is different from the temperature difference from the hot water supply set temperature in the temperature drop region during the trial run beyond a predetermined allowable range, the hot water supply operation performed by the monitoring is performed. The raising temperature of the temperature control information applied after the next hot water supply operation may be changed and set according to a different degree beyond the allowable range of the temperature difference.

Further, the temperature control information setting means sets the hot water supply temperature detected by the hot water supply temperature detecting means 76 after the combustion of the hot water supply burner 61 which started combustion at the start of hot water supply is stopped for each hot water supply operation of the heat source device or a predetermined hot water supply. By monitoring for each number of operations or for each predetermined monitor timing for each predetermined set period, the detection temperature of the hot water supply temperature detecting means 76 at the time of monitoring sets a predetermined allowable range with respect to the hot water supply set temperature. When the temperature exceeds the allowable range and becomes different, the raising temperature of the temperature control information applied after the next hot water supply operation after the hot water supply operation performed by the monitor is changed according to the degree of difference exceeding the allowable range of the hot water supply temperature. You may set it.

By providing these learning functions, it is possible to appropriately stabilize the hot water supply temperature even when various conditions such as the outside air temperature differ between the hot water supply operation in the test run mode and the actual hot water supply operation.

Further, the first set capacity is the branching fraction of hot water that is introduced into the hot water supply circuit 62 and flows by branching to the hot water supply heat exchanger 17 side and the bypass passage 68 side to the hot water supply heat exchanger 17 side and the main heat. It may be set to a value corresponding to the amount of water held in the exchanger, and in this case, it is obtained by, for example, the equation (2).

First set capacity = (Amount of water retained in the main heat exchanger 17a ÷ Branching fraction on the hot water supply heat exchanger 17 side-Corrected water amount) ... (2)

For example, in the case of applying to the above embodiment, after the combustion of the hot water supply burner 61 is stopped after the hot water supply is started, the ratio of the hot water introduced into the hot water supply circuit 62 to the hot water supply heat exchanger 17 side and the bypass passage 68 side (bypass ratio). Since the value is 1: 3.5, the branching rate to the hot water supply heat exchanger 17 side is about 0.22, and the amount of water held by the main heat exchanger 17a is 0.6 liters, so the corrected water amount is set to 0. In the case of .4 liters, the first set capacity is (0.6 liters ÷ 0.22-0.4 liters) ≈2.3 liters according to the formula (2).

The amount of corrected water in the formula (2) is the correction because the inside of the main heat exchanger 17a is not completely filled with hot water (the temperature on the inlet side of the main heat exchanger 17a is almost not heated). When the temperature is low (temporarily heating degree 14%) and the temperature of the hot water on the outlet side is, for example, 60 ° C. (temporarily heating degree 100%), the average heating degree does not reach 100%, so correction for subtraction correction Value), which is obtained and set in advance by experiments or the like. Here, assuming that the hot water supply flow rate is 8 liters / minute, the time t1 required to flow the hot water of the first set capacity can be 2 liters ÷ 8 liters / minute = 0.25 minutes = 15 seconds.

In addition, although the subtraction correction was performed in the equation (2), the correction may be performed by subtraction and integration using the average heating degree.

Further, the second set capacity is set to a value corresponding to the branching fraction and the amount of water held in the latent heat recovery heat exchanger 17b, and the second set capacity may be a value obtained by the equation (3).

2nd set capacity = (Amount of water retained in the latent heat recovery heat exchanger 17b ÷ Branching fraction on the hot water supply heat exchanger 17 side + 1st correction value + 2nd correction value) ... (3)

When applied to the above embodiment, the latent heat recovery heat exchanger 17b has 0.7 liters of water, the first correction value is 0.4 liters, the second correction value is 1.3 liters, and the second. The set capacity is (0.7 ttle ÷ 0.22 + 0.4 liter + 1.3 liter) ≈ 4.88 liter according to the formula (3).

The first correction value in the formula (3) is the correction water amount in the formula (2). The second correction value is the hot water supply heat obtained by the hot water from the hot water storage tank 2 introduced into the hot water supply heat exchanger 17 after the combustion of the hot water supply burner 61 is stopped is derived from the hot water supply heat exchanger 17 through the hot water supply heat exchanger 17. The amount of heat on the outlet side of the exchanger 17 is exactly the same as the value obtained by the temperature of the hot water introduced into the hot water supply circuit 62 of the water heater 16 × the branching rate on the hot water supply heat exchanger 17 side (about 0.22 in this embodiment). It is a correction value that compensates for the heat lost to the latent heat recovery heat exchanger 17b (so the temperature rises only gently and the rise is delayed), and each is obtained in advance by experiments or the like. It is set. Here, assuming that the hot water supply flow rate is 8 liters / minute, the time t2 required to flow the second set capacity of hot water may be 4.88 liters ÷ 8 liters / minute = 0.61 minutes ≒ 37 seconds. it can.

Further, in the above embodiment, the temperature of the hot water sent from the hot water storage tank 2 side to the hot water supply circuit 62 side of the water heater 16 is set to the hot water supply from the start of the hot water supply until the capacity (integrated flow rate) of the hot water reaches the first set capacity. As the set temperature, the temperature is set to be higher than the hot water supply set temperature from the time when the first set capacity is reached until the second set capacity is reached, and after the second set capacity is reached, the hot water supply set temperature is set. However, considering that the hot water cools according to the outside temperature while the hot water reaches the hot water supply tank 16 side from the hot water storage tank 2, set an extra temperature such as 0.5 ° C, and start the hot water supply. Until the capacity (integrated flow rate) reaches the first set capacity, the hot water supply set temperature is added to the hot water supply set temperature, and the hot water supply set temperature is reached after the first set capacity is reached until the second set capacity is reached. The temperature may be obtained by adding the raising temperature to the value obtained by adding the extra temperature, and may be the value obtained by adding the extra temperature to the hot water supply set temperature after reaching the second set capacity.

Further, in the above embodiment, the hot water supply temperature adjusting means 36 sets the temperature of the hot water in advance of the hot water supply set temperature after the capacity of the hot water sent from the hot water storage tank 2 side to the hot water supply device 16 side reaches the first set capacity. When the specified raising temperature is set to a high temperature, for example, as shown in the characteristic line b in FIG. 3, the temperature of the hot water is raised by the raising temperature at once (the temperature change is made stepwise). Instead of doing so, for example, the hot water is raised slowly so that the gentle curve of the temperature drop after stopping the combustion of the hot water supply burner of the characteristic line a in FIG. 3 can be complemented. The temperature of the hot water may be higher than the set temperature of the hot water supply so that the temperature rise gradient of the temperature of the above temperature is substantially equal to the absolute value of the temperature fall gradient of the characteristic line a in FIG.

Further, when the hot water temperature adjusting means 36 sets the hot water temperature as the hot water supply set temperature after the capacity of the hot water sent from the hot water storage tank 2 side to the water heater 16 side reaches the second set capacity, the same applies. The temperature may be gradually lowered to return to the hot water supply set temperature. That is, in the above embodiment, the temperature change characteristic line is raised so as to have a rectangular shape as shown in the characteristic line b in FIG. 3, but the temperature change characteristic line may be raised to a trapezoidal shape without being limited to this.

Further, in the above embodiment, the temperature control information setting means 38 sets the first set capacity, the second set capacity, and the raised temperature, but instead of the first set capacity and the second set capacity, the first set capacity Or, a calculation formula for calculating the time required to flow the hot water of the first set capacity, a calculation formula for calculating the time required to flow the hot water of the second set capacity, or the like may be given from the second set capacity and the hot water supply flow rate. ..

In addition, when the learning function as described above was provided, the situation changed due to the replacement of the auxiliary heat source device such as the water heater 16, the rebuilding of the neighboring house and the change in the installation environment, and the relocation of the auxiliary heat source device. Etc. can be determined quickly and accurately, and in that case, temperature control information such as the raising temperature can be obtained not at the time of the test run but at the time of the test run equivalent operation, so that the replacement of the water heater 16 etc. However, it is possible to take appropriate measures.

Further, for example, when the auxiliary heat source device such as the water heater 16 is replaced, the remote control device 43 can obtain information such as the number of the auxiliary heat source device by connecting the auxiliary heat source device to the remote control device 43 by a signal. In this way, the control device 33 on the main heat source side (for example, the tank unit 4 side) obtains information from the remote control device 43 side, and based on the information, a plurality of the first set capacities and the second set capacity are set in advance. An appropriate value may be automatically selected from the information values such as the set capacity and the raising temperature.

Further, when the length of the connection pipe (hot water introduction passage 15 in FIG. 6) connecting the hot water storage tank 2 and the hot water introduction side of the hot water supply circuit 62 of the water heater 16 is shorter than the preset length (for example, 4 m) given in advance. In the above period, from the start of hot water supply to the elapse of a predetermined water introduction time, water is introduced into the water heater 15 from the water supply passage 8b instead of the hot water discharged from the hot water storage tank 2, and the water introduction time is described. A hot water introduction variable means at the start of hot water supply may be provided so that the hot water discharged from the hot water storage tank 2 is introduced into the water heater 15 through the hot water passage 9 after the lapse of time.

The water introduction time is set in advance from the hot water supply set temperature or the hot water supply set temperature when the water introduced into the water heater 16 from the water supply passage 8b is heated by the combustion of the hot water supply burner 61 and the hot water in the main heat exchanger 17a is heated. The time is set to an appropriate time, such as the time until the water is heated to a higher temperature, or the time obtained by subtracting the capacity of the hot water introduction passage 15 from this time.

Further, the detailed system configuration of the heat source device of the present invention is appropriately set. For example, in the above embodiment, the tank hot water mixer 12 and the water mixer 14 are both two-way valves, and these mixers 12, 14 Although the mixing ratio was adjusted at two places in the above, for example, instead of using a two-way valve, a three-way valve may be provided at one place to adjust the mixing ratio.

Further, in the above embodiment, the water supply flow rate sensor 29 and the flow rate detecting means 42 are separated and both are provided in the heat source device, but either one may be used in combination. For example, when only the flow rate detecting means 42 is provided, the detection signal of the flow rate detecting means 42 is also added to the mixing flow rate controlling means 35. When both the water supply flow rate sensor 29 and the flow rate detecting means 42 are provided, the detection signal of the flow rate detecting means 42 may be added to the mixing flow rate controlling means 35 or the like, but the water supply flow rate to the mixing flow rate controlling means 35 or the like. By adding the detection signal of the sensor 29, it is not necessary to exchange information between the auxiliary heat source device such as the water heater 16 and the tank unit 4, and the control configuration can be simplified.

Further, the water heater 16 may also be a type of water heater in which the hot water supply heat exchanger 17 is heated by, for example, an oil combustion type burner device.

Further, in the above embodiment, the hot water storage tank 2 is thermally connected to the fuel cell 1, but instead of the fuel cell 1, a solar heat collector, a heat pump, or the like may be connected.

The heat source device of the present invention can stabilize the hot water supply temperature and is easy to use, so that it can be used as a heat source device for home use, for example.

1 Fuel cell 2 Hot water storage tank 3 Heat recovery passage 4 Tank unit 5 Hot water temperature detection means in hot water storage tank 8, 8a, 8b Water supply passage 9 Hot water outlet passage 10 Confluence 11 Hot water storage tank hot water temperature detection means 12 Tank hot water mixer 16 Water heater 47 Combustion control means 67 Hot water supply heat exchange outlet side temperature detection means 71 Water supply temperature detection means 73 Memory unit 74 Bypass servo control means

Claims (8)

It has a main heat source that has the function of discharging hot water, and the hot water introduction side of the hot water supply circuit of the auxiliary heat source device equipped with the hot water supply heat exchanger is connected to the downstream side of the passage of the hot water discharged from the main heat source. The auxiliary heat source device performs a water supply temperature detecting means for detecting the temperature of hot water introduced into the hot water introduction side of the hot water supply circuit, a hot water supply burner for heating the hot water supply heat exchanger, and combustion control of the hot water supply burner. Combustion control means, hot water supply heat exchange side temperature detecting means for detecting the temperature on the outlet side of the hot water supply heat exchanger, and hot water introduced into the hot water supply circuit from the hot water supply circuit without passing through the hot water supply heat exchanger. A bypass passage for deriving and a bypass servo provided in the bypass passage are provided, and the bypass servo is controlled by the bypass servo control means to the hot water supply heat exchanger side of the hot water introduced into the hot water supply circuit. Has a configuration in which the distribution ratio and the distribution ratio to the bypass passage side are controlled within a predetermined bypass ratio change range, and when hot water supply is started, hot water at a hot water supply set temperature is supplied from the main heat source side. The hot water supply heat exchanger heats the hot water passing through the hot water supply circuit, which has a function of sending to the hot water supply circuit side of the auxiliary heat source device and the combustion control means of the auxiliary heat source device starts combustion of the hot water supply burner. While supplying hot water, the detection temperature of the water supply temperature detecting means is taken in, and the detection temperature is the detection temperature of the hot water supply set temperature, the hot water supply heat exchange side temperature detecting means, and the bypass ratio to the bypass passage side in the bypass ratio change range. A heat source device characterized in that combustion of the hot water supply burner is stopped and hot water supply is continued when the water supply limit temperature is lower than the hot water supply set temperature, which is a value obtained in advance by the maximum value of the hot water supply burner. The auxiliary heat source device controls the combustion of the hot water supply burner by the combustion control means so that the temperature of the hot water discharged from the hot water supply heat exchanger through the hot water supply heat exchanger becomes the heat exchange reference temperature obtained in advance, and the hot water supply heat exchange The hot water supply heat exchanger is such that the bypass servo control means changes the ratio of the hot water of the heat exchange reference temperature and the hot water of the heat exchange reference temperature that joins the hot water through the bypass passage by the control of the bypass servo. The heat source device according to claim 1, further comprising a hot water supply temperature control configuration for controlling the hot water to be supplied. The bypass servo control means according to claim 1 or 2, wherein the bypass servo is controlled so that the distribution ratio to the bypass passage side becomes the maximum within the ratio change range after the hot water supply burner is stopped. The heat source device according to claim 3. The hot water supply heat exchanger of the auxiliary heat source device is a main heat exchanger that absorbs the apparent heat of the combustion gas of the hot water supply burner and a latent heat that is provided on the upstream side of the main heat exchanger to recover the latent heat of the combustion gas. It has a heat exchanger for recovery, and has a function of passing hot water sent from the main heat source to the auxiliary heat source device in order through the latent heat recovery heat exchanger and the main heat exchanger to supply hot water to the hot water supply destination. A hot water supply temperature adjusting means for adjusting the temperature of hot water sent from the main heat source side to the hot water supply circuit side of the auxiliary heat source device is provided on the main heat source side, and the hot water supply burner in the hot water supply operation during the trial run of the heat source device. Based on the detection temperature of the hot water supply heat exchange side temperature detecting means detected after the hot water supply burner has stopped burning after the start of combustion, the time required from when the hot water supply burner is stopped until the temperature drops below the hot water supply set temperature. A first set capacity based on the hot water supply flow rate, and a second set based on the time required for returning to the hot water supply set temperature after the detection temperature of the hot water supply heat exchange side temperature detecting means falls below the hot water supply set temperature and the hot water supply flow rate. For temperature control of the hot water supply temperature adjusting means, the set capacity and the raising temperature based on the temperature characteristics until the temperature on the outlet side of the main heat exchanger drops below the hot water supply set temperature and then returns to the hot water supply set temperature. It has a temperature control information setting means for setting as information, and the temperature of hot water sent by the hot water supply temperature control means from the main heat source side to the hot water supply circuit side of the auxiliary heat source device is set from the start of hot water supply based on the temperature control information. Until the capacity of the hot water reaches the first set capacity, the hot water supply set temperature is set to a temperature higher than the hot water supply set temperature from the time when the first set capacity is reached until the second set capacity is reached. The heat source device according to claim 1, claim 2 or claim 3, wherein the hot water supply set temperature is set after the second set capacity is reached. The temperature control information setting means obtains the detection information of the hot water supply heat delivery side temperature detecting means after the combustion of the hot water supply burner that started burning at the start of hot water supply is stopped for each hot water supply operation of the heat source device or for each predetermined number of hot water supply operations. The hot water supply set temperature in the temperature drop region where the detection temperature of the hot water supply heat delivery side temperature detecting means is lower than the hot water supply set temperature at the time of monitoring by monitoring at each predetermined monitor timing for each predetermined set period. When the temperature difference between and is different from the temperature difference from the hot water supply set temperature in the temperature drop region during the trial run beyond a predetermined allowable range, it is applied after the next hot water supply operation of the hot water supply operation in which the monitoring is performed. The heat source device according to claim 4, wherein the raising temperature of the temperature control information is changed and set according to a different degree beyond the allowable range of the temperature difference. It has a hot water supply temperature detecting means that detects the temperature of hot water supplied through the hot water supply circuit as the hot water supply temperature, and the temperature control information setting means detects the hot water supply temperature after the combustion of the hot water supply burner that started burning at the start of hot water supply is stopped. The hot water supply temperature detected by the means is monitored for each hot water supply operation of the heat source device, for each predetermined number of hot water supply operations, or for each predetermined monitor timing for each predetermined set period, and the hot water supply temperature is detected at the time of monitoring. When the detection temperature of the means exceeds the predetermined allowable range for the hot water supply set temperature and becomes a different temperature, the temperature control information applied after the hot water supply operation after the hot water supply operation in which the monitoring is performed is raised. The heat source device according to claim 4, wherein the temperature is changed and set according to a different degree beyond the allowable range of the hot water supply temperature. A water supply passage is connected to the hot water introduction side of the auxiliary heat source device in addition to the hot water passage from the main heat source, and the main heat source and the hot water introduction side of the hot water supply circuit of the auxiliary heat source device are connected via a connection pipe. If the connection pipe is connected and the length of the connection pipe is shorter than the preset length given in advance, hot water is supplied instead of being sent from the main heat source side to the hot water supply circuit side of the auxiliary heat source device when hot water supply is started. Water is introduced from the water supply passage into the auxiliary heat source device from the start until a predetermined water introduction time elapses, and after the water introduction time elapses, hot water is discharged from the main heat source through the hot water passage. The heat source device according to claim 4, claim 5 or claim 6, wherein the hot water introduced at the start of hot water supply variable means for introducing the hot water to be introduced into the auxiliary heat source device. The main heat source has a hot water storage tank, and a confluence portion where the hot water passage and the water supply passage confluent from the hot water storage tank is provided, and a mixing means for mixing the hot water and water merged at the confluence portion, and A hot water introduction passage for introducing hot water mixed and formed by the mixing means into an auxiliary heat source device, and a mixing flow rate control means for controlling the flow rate of hot water and the flow rate of water flowing to the confluence by controlling the mixing means. 1 to claim, wherein the hot water supply temperature adjusting means gives a command to the mixing flow rate controlling means to adjust the temperature of the hot water sent from the main heat source to the auxiliary heat source device side. The heat source device according to any one of 7.

Images