JP2015190737A - heat source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable hot water to be supplied from a main heat source at a stable hot water supply temperature through an auxiliary heat source device.SOLUTION: The present invention provides a function of supplying hot water which is sent from a hot water storage tank to a water heater through a hot water circuit of the water heater. Upon starting of hot water supply, heating control means 47 of the water heater starts heating of a hot water supply burner. On the basis of a heating amount, capacity, and hot water temperature of a hot water heat exchanger provided at the hot water circuit. a temperature of hot water introduced in the hot water circuit is calculated by hot water temperature calculation value detecting means 72 as a hot water temperature calculation value. On the basis of a temperature increase of the hot water temperature calculation value, when, for example, the difference between the hot water temperature calculation value and a hot water temperature for control, which is obtained on the basis of the hot water temperature calculation value, reaches a reference value, hot water of the prescribed hot water temperature from the hot water storage tank is judged to reach the water heater and introduced therein, thereby stopping the heating of the hot water supply burner.

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. 3 shows a heat source device under development by a schematic system configuration diagram. In the figure, a tank unit 4 having a hot water tank 2 and a hot water passage 9 is thermally connected to a fuel cell (FC) 1 through 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 fuel such as city gas with oxygen in the air by reverse reaction of water electrolysis. It is a power generation device that generates electricity.

  The heat recovery passage 3 is a passage that circulates liquid (here, hot water) between the fuel cell 1 and the hot water tank 2 as indicated by arrows A and A ′ in the figure. Is provided with a pump (not shown) for circulating the liquid in the heat recovery passage 3. Then, by driving the pump, the water in the hot water tank 2 is introduced into the fuel cell 1 through the heat recovery passage 3 as shown by an arrow A ′ in the figure to be cooling water, and this water is used when the fuel cell 1 generates power. After being heated by the generated waste heat, it passes through the heat recovery passage 3 as indicated by an arrow A in the figure, and accumulates in the hot water tank 2 as hot water having a temperature of 60 ° C., for example. The heat recovery passage 3 is provided with a bypass passage 7 through a three-way valve 6 so that the liquid flowing from the fuel cell 1 side to the hot water tank 2 side can be passed through the fuel cell without passing through the hot water tank 2 as necessary. It is formed so that it can be returned to 1.

  In the hot water tank 2, hot water temperature detecting means 5 in the hot water tank 2 for detecting the temperature of the hot water in the hot water tank 2 is provided in the hot water tank 2 or on the outer wall of the hot water tank 2 with a space therebetween in the vertical direction of the hot water tank 2. A plurality (five in FIG. 3) are provided. The hot water temperature detection means 5a in the hot water tank provided at the top is filled with hot water up to a position lower than the upper end of the hot water tank 2 by a predetermined set length, that is, for example, to the upper end of the hot water tank 2. The amount of hot water 20 liters less than that of the hot water is provided at the position of the hot water surface when the hot water tank 2 is introduced.

  The hot water passage 9 connected to the upper side of the hot water tank 2 is a passage for discharging (water feeding) the hot water formed in the hot water tank 2, and the hot water passage 9 includes a hot water passage 9. A hot water tank outlet hot water temperature detecting means 11 for detecting the temperature of hot water passing through the tank, a tank hot water mixer 12 for changing the amount of hot water sent through the hot water passage 9, and whether or not hot water is supplied through the hot water passage 9. A pilot-type tank-side electromagnetic valve 13 that is switched by opening and closing the valve is provided. Although not shown in the figure, the heat source device having the hot water tank 2 has an overpressure relief valve for releasing the pressure to the outside when the pressure in the hot water tank 2 exceeds the allowable pressure. It is provided at an appropriate position (for example, a pressure relief passage 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, one water supply passage 8 (8a) is connected to the lower side of the hot water tank 2, and the other water supply passage 8 is connected. (8b) is formed so as to join the hot water passage 9 at the joining portion 10. The water supply passage 8b is provided with a water mixer 14 for changing the amount of water flowing from the water supply passage 8b to the merging portion 10 side. In this heat source device, the mixing means for mixing the hot water and water joined at the junction 10 is formed with a water mixer 14 and the tank hot water mixer 12, and FIG. Since it is a block diagram, the water mixer 14 and the tank hot-water mixer 12 are shown at positions separated from each other, but they may be provided near the junction 10. The water supply passage 8 is connected to the water supply.

  In FIG. 3, dots are marked on the flow path of hot water sent from the fuel cell 1 to the hot water tank 2 side and the flow path of hot water flowing from the hot water tank 2 through the hot water passage 9 to the junction 10 side. A hot water introduction side of a water heater 16 as an auxiliary heat source device is connected to the junction 10 via a hot water introduction passage 15, and a mixed thermistor 28 (28 a, 28 b) is provided in the hot water introduction passage 15. . Then, the hot water fed from the hot water tank 2 through the hot water passage 9 as shown by the arrow B in FIG. 3 (water fed from the tank unit 4) is passed through the hot water introduction passage as shown by the arrow B ″ in FIG. 15 is introduced into the hot water supply circuit 62 of the hot water heater 16.

  The hot water supply circuit 62 of the hot 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 provided in the combustion chamber 66. Although not shown in the figure, for example, hot water supply When the burner 61 is formed of a gas burner, a gas supply passage for supplying fuel gas to the hot water supply burner 61 is provided, and the gas supply passage has a gas on / off valve that controls whether or not the hot water supply burner 61 is supplied through the gas supply passage ( Gas solenoid valve) and a gas proportional valve for adjusting the supply amount thereof. In addition, appropriate components (not shown) such as a combustion fan for supplying and exhausting air to and from the hot water supply burner 61 are provided, and the heating control of the hot water supply heat exchanger 17 can be controlled by controlling these components. Done. The hot water supply heat exchanger 17 may or may not include a latent heat recovery heat exchanger.

  A flow rate detecting means 42 is provided in the passage on the inlet side of the hot water supply circuit 62, and the hot water temperature detection for detecting the temperature of the hot water supplied through the hot water supply circuit 62 (hot water temperature) in the outlet side passage of the hot water heat exchanger 17. Means 76 are provided. The passage 18 on the outlet side of the hot water supply circuit 62 is connected to the hot water supply passage 19 via the connection means 20, and the flow rate detection means 42 detects the flow rate of hot water supplied through the passage 18 and the hot water supply passage 19.

  Further, the hot water supply circuit 62 is provided with a bypass passage 68 for leading 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 bypass solenoid valve 69 is provided. By opening / closing the bypass electromagnetic valve 69, the flow rate of the hot water introduced into the hot water supply circuit 62 to the hot water supply heat exchanger 17 side and the flow rate to the bypass passage 68 side are controlled within a predetermined rate change range. Consists of composition.

  For example, when the bypass solenoid valve 69 is completely closed, 100% (or almost 100%) of hot water introduced into the hot water supply circuit 62 can be passed to the hot water supply heat exchanger 17 side, while the bypass solenoid valve 69 is fully opened. In such a case, for example, the hot water introduced into the hot water supply circuit 62 is passed through at a ratio of 1: 3 between the hot water supply heat exchanger 17 side and the bypass passage 68 side.

  The heat source device has a follow-up hot water supply function for heating (following heating) hot water introduced into the hot water supply circuit 62 of the hot water supply device 16 from the hot water passage 9 side and supplying hot water, and the hot water passage 9. From the hot water supply circuit 62 to the hot water supply destination through the hot water supply circuit 62 without heating. The hot water heater 16 closes the bypass valve 69 and heats the hot water introduced into the hot water supply circuit 62 through the hot water supply heat exchanger 17 side when the additional heating hot water supply function is operated, for example, and bypasses when the non-following hot water supply function is operated. The valve 69 is opened to supply hot water introduced into the hot water supply circuit 62 mainly through the bypass passage 68.

  The hot water that has passed through the hot water supply circuit 62 of the water heater 16 is either hot water that has passed through the hot water supply circuit 62 while being heated by the follow-up heating hot water supply function, or hot water that has not been heated by the non-following heating hot water supply function. Hot water is supplied to one or more hot water supply destinations through the passage 18 and the hot water supply passage 19 in order. Although not shown in the figure, a hot water tap is provided at the distal end side of the hot water passage 19, and the hot water stored in the hot water storage tank 2 receives the hot water pressure by opening the hot water tap. As described above, the hot water passes through the hot water passage 9 and is mixed with water from the water supply passage 8b as necessary, or is heated by the hot water heater 16, or the hot water is supplied without being mixed or heated.

  In FIG. 3, reference numeral 25 denotes an incoming water temperature thermistor, reference numeral 26 denotes an FC high temperature thermistor for detecting hot water temperature introduced from the fuel cell 1 to the hot water tank 2, and reference numeral 27 denotes the hot water tank 2 to the fuel cell 1 side. The FC low temperature thermistors for detecting the hot and cold water temperatures are respectively shown. Reference numeral 29 denotes a feed water flow sensor, and reference numeral 50 denotes a pressure reducing valve.

  FIG. 4 shows a system configuration diagram in which some of the piping and components in the system configuration shown in FIG. 3 are omitted or shown by broken lines. As shown in FIG. One end side of the connection passage 21 is connected via the means 20, and the other end side of the connection passage 21 is connected to a middle portion of the passage through which the hot water passes from the fuel cell 1 side to the hot water tank 2 side in the heat recovery passage 3. Yes. In addition, a connection passage 22 is provided in the heat recovery passage 3 to connect a middle portion of a passage for passing hot water from the hot water storage tank 2 side to the fuel cell 1 side and a front end side of the hot water passage 9. A circulating pump 23 for circulating hot water and a water electromagnetic valve 24 are provided.

  Of the passage 18, the connection passage 21, and the heat recovery passage 3, the passages 3 a and 3 b (part of the region closer to the hot water tank 2 than the connection portion to the connection passage 21 and the connection portion to the connection passage 22) Further, a hot water circulation passage 40 that has the bypass passage 7, the connection passage 22, and the hot water introduction passage 15 and circulates the hot water as shown by an arrow C in the figure is formed. The water electromagnetic valve 24 is an electromagnetic valve that switches the presence or absence of water circulation to the hot water circulation passage 40 by driving the circulation pump 23 by opening and closing the valve. The water electromagnetic valve 24 is opened to drive the circulation pump 23. The hot water supply device 16 has a circulating hot water heating function in which the hot water supply device 16 heats the hot water circulating through the hot water circulation passage 40 by the hot water supply heat exchanger 17. The operation of the circulating hot water heating function is also performed by controlling the components of the water heater 16.

  In FIG. 4, dots are marked in a passage portion through which hot water heated by heating mainly passes, and gradually in the hot water circulation passage 40, the temperature of the heated hot water gradually passes through the hot water circulation passage 40. Although it cools, dots are marked in the hot water circulation passage 40 in the region from the hot water outlet side passage 18 of the water heater 16 to the inlet of the bypass passage 7. In FIG. 4, dots are also marked on the hot water passage 9 (passage leading to the junction 10) discharged from the hot water tank 2 side.

  Further, the heat source device shown in FIGS. 3 and 4 is provided with a control device (not shown). The control device controls the tank hot water / water mixer 12 from the hot water passage 9 to the junction 10 side. In addition to controlling the flow rate of flowing hot water, the water mixer 14 is controlled to control the flow rate of water flowing from the water supply passage 8b to the merging portion 10 so that mixed hot water having an appropriate temperature is formed at the merging portion 10. Mixing flow rate control means is provided.

  This mixing flow rate control means closes the tank side solenoid valve 13 when hot water supply is stopped, for example, so that the flow rate of hot water (hot water discharged from the hot water storage tank 2) flowing from the hot water passage 9 to the junction 10 side becomes zero. . Then, when the hot water tap provided at the front end 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 receives the detection signal. 3, the flow rate of hot water flowing from the hot water passage 9 to the merging portion 10 side is adjusted by the control of the tank hot water mixer 12 as shown by the arrow B in FIG. 3, 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 in the merging portion 10 is set to the same level as, for example, the hot water supply set temperature. Set to the mixed set temperature.

  Note that the hot water stored in the hot water tank 2 is formed with layers Wa, Wb, and Wc having temperatures as shown in the schematic diagram of FIG. (High temperature layer) Wa stores hot water of high temperature Ta (for example, 60 ° C.) heated by waste heat generated during power generation of the fuel cell 1, and a lower layer (low temperature layer) Wc of the hot water tank 2 stores a hot water tank. Water having the same temperature Tc (for example, 15 ° C.) as the temperature of the water supplied in 2 is stored, and there is a layer (temperature intermediate layer) Wb having a steep temperature gradient from temperature Ta to temperature Tc. . Therefore, when there is no hot water in the layer Wa, cold water may be sent from the hot water passage 9 instead of hot water. However, for convenience of explanation, hot water is discharged from the hot water passage 9 unless otherwise specified. The expression “merge to the junction 10” is used.

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

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

  When the temperature of the mixed hot water formed in the merging portion 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 the kissing flow rate control means, the mixed hot water is As shown by the arrow B ″ in FIG. 3, the hot water is introduced into the hot water heater 16 through the hot water introduction passage 15 from the junction 10, but at this time, the hot water heater 16 is not heated by the hot water heat exchanger 17 ( Hot water is supplied to the hot water supply destination through the passage 18 and the hot water supply passage 19 by the operation of the non-heating hot water supply function.

  On the other hand, the detected temperature of the hot water temperature detecting means 5a in the hot water tank is below the threshold value, and hot water having a mixed set temperature set to a temperature equivalent to the hot water set temperature can be supplied only by the flow rate control by the mixing flow rate control means. If it is not possible, for example, the mixing set temperature is set to a temperature lower than the hot water supply set temperature. As an example, the mixing set temperature is lowered from the hot water supply setting temperature to a value obtained by subtracting the temperature that rises when water at the hot water supply flow rate is heated at the MIN number (minimum combustion number) of the water heater 16, and the mixed hot water is supplied Hot water having a hot water supply set temperature 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 passage 18 and the hot water supply passage 19.

  In addition, in the heat source device provided with the conventional hot water storage tank 2, the type (integrated type) heat source device in which the tank unit 4 and the water heater 16 are disposed adjacent to each other is used, but the heat source device under development is The tank unit 4, the hot water heater 16, and the fuel cell 1 are individually arranged, and an individual arrangement type heat source device in which the tank unit 4, the water heater 16, and the fuel cell 1 are connected to each other by piping is also possible. If it does in this way, the tank unit 4 provided with the hot water storage tank 2 of the capacity | capacitance which a user requires among several types of tank units 4 will be selected, for example, and it will select among the tank units 4 and multiple types of water heaters The water heater 16 thus made and the fuel cell 1 selected from the plural types of fuel cells 1 can be combined, and variations can be increased.

  Further, the individual arrangement type heat source device as described above has an advantage that the heat source device can be formed by connecting the tank unit 4 or the like to the existing water heater 16. In this case, it is assumed that the tank unit 4 and the water heater 16 are arranged apart from each other, for example, the water heater 16 is arranged on the north side of the building and the tank unit 4 is arranged on the east side or the west side of the building. However, in such a case, the water solenoid valve 24 is opened to prevent the water in the hot water introduction passage 15 and the connection passage 21 from freezing during the hot water supply stop in winter and the like. As shown by an arrow C in FIG. 4, the circulating hot water heating function for heating the hot water supply heat exchanger 17 while circulating hot water in the hot water circulation passage 40 is appropriately performed. It is thought that it becomes.

Japanese Patent No. 3728265 Japanese Patent Laid-Open No. 8-20113

  By the way, in the heat source device as shown in FIG. 3, when hot water having a temperature equal to or higher than the threshold value is stored in the hot water storage tank 2, the hot water temperature is substantially higher than the hot water supply set temperature (for example, hot water from the hot water storage tank 2 to the water heater In the case where hot water having a temperature that is higher than the hot water supply set temperature, for example, by a temperature higher than the hot water supply temperature, for example, by 0.5 ° C. or more, is stored. Although it is possible to supply hot water sent to the hot water without heating (without performing additional heating by the hot water supply heat exchanger 17 of the hot water heater 16), even when the hot water temperature in the hot water tank 2 is high in this way, The pipes in the hot water introduction passage 15 and the hot water heater 16 are cooled as in the case of the first hot water supply after the heat source device is installed, or when the hot water is stopped again after a time of, for example, 8.5 minutes or more has elapsed. In some cases, the water in these pipelines can be heated. The cornerstone. Especially in winter, the piping is very cold, so even if the time from the hot water supply stop is 3 minutes or less, the influence is great.

  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 the hot water is supplied as soon as possible after the user opens the hot water tap. In order to supply hot water at a set temperature, it is necessary to quickly form hot water by burning the hot water supply burner 61 of the water heater 16 when hot water supply is started, in order to improve user convenience. Is required.

  On the other hand, when hot water having a hot water supply set temperature reaches the hot water heater 16 substantially from the hot water storage tank 2, unless the combustion of the hot water supply burner 61 is stopped, the hot water that does not need to be heated is excessively heated. Therefore, it is considered that it is important to make the timing of stopping (extinguishing) combustion of the hot water supply burner 61 appropriate. In addition, when hot water having a temperature higher than the hot water supply set temperature, for example, 8 ° C. is poured out, the user feels uncomfortable, and in some cases, there is a risk of light burns. Preventing the occurrence of shoots is an important issue.

  However, in the individually arranged heat source device in which the tank unit 4 and the water heater 16 are individually arranged and connected by piping, the connecting piping (for example, the tank unit 4 and the water heater in the hot water introduction passage 15 in FIG. 3). Since the length of the pipe line (16) differs from construction to construction, the control device of the heat source device cannot grasp the length of the pipe in advance. In addition, even if the construction contractor provides a configuration that inputs the length of the pipe for connection, the contractor may forget to enter or not enter the correct value. It is understood that the combustion stop control of the hot water supply burner 61 is performed by appropriately grasping the timing at which hot water having a hot water supply set temperature from the hot water tank 2 reaches the hot water heater 16 based on the length of the hot water supply tank 16. It becomes difficult.

  In addition, the temperature of the hot water passing through the piping will be affected by the location of the piping for connection, the difference in season, the presence of sunlight, etc., so the control device of the heat source device accurately knows the length of the piping for connection. Even if it can be done, for example, when the length of the connecting pipe is long, or when the hot water supply is started when the pipe is cold and is in a low temperature state close to the temperature of the pipe, the junction 10 When the hot water having a hot water supply set temperature formed by the heat passes through the connection pipe, the heat is taken away, and the time until the hot water at the hot water set temperature is introduced into the water heater 16 is Since the time until warming is also combined, it is considered that the hot water supply temperature cannot be stabilized even if the combustion stop timing of the hot water supply burner 61 is simply determined according to the length of the connection pipe.

  In addition, as described in Patent Document 2, when a water heater having a method of calculating the incoming water temperature without detecting it in real time is applied to the hot water heater 16, a detection sensor for the incoming water temperature (feed water temperature). However, if the combustion amount of the water heater 16 is controlled based on the incoming water temperature obtained by calculation, it corresponds to the incoming water temperature as compared with the combustion amount control method based on the actual incoming water temperature. Since the combustion amount control is delayed, a control configuration considering the delay is important.

  Furthermore, in the heat source device under development, in the heat source device in which the tank unit 4 and the water heater 16 are individually installed and connected by the hot water introduction passage 15 (because it has a heating means for heating by the combustion heat of the gas burner). Even if the hot water heater 16 breaks first, the system can be maintained if only the hot water heater 16 is replaced. On the other hand, a contractor who installs a new water heater 16 was released, for example, 12 years ago. In many cases, the construction manual for the tank unit 4 is not available, so that the tank unit 4 and the water heater 16 are linked to each other, that is, when the water heater 16 is replaced, the setting on the tank unit 4 side must be changed. There is a need to avoid things that don't go away.

  Furthermore, according to the situation of the neighbor next to the hot water heater 16, when the new hot water heater 16 is installed at a location different from the current installation location, or when the new hot water heater 16 is installed compared to the conventional hot water supply capacity. It must also be considered that the model will be changed to a model with a higher capacity (a model that not only increases the amount of gas consumed but also has a low resistance to water flow and a high maximum hot water discharge capacity). That is, in such a model having a high hot water supply capacity, the flow velocity flowing in the auxiliary heat source device becomes high, and therefore it is necessary to control the combustion stop timing of the hot water supply burner 61 so as to follow this speed.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to send hot water at a substantially hot water supply set temperature to an auxiliary heat source device provided on the hot water discharge tip side (downstream side) of the main heat source. To provide a heat source device that can stabilize the hot water supply temperature when the hot water supply is performed. For example, even when the auxiliary heat source device is changed by replacement, the stabilization of the hot water supply temperature is prevented. It is.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, according to the first aspect of the present invention, a hot water introduction side of a hot water supply circuit of an auxiliary heat source device provided with a hot water supply heat exchanger is connected to a downstream side of a hot water passage discharged from a main heat source, and the auxiliary heat source device is connected to the main heat source. A hot water supply burner for heating the hot water supply heat exchanger and a combustion control for controlling the combustion of the hot water supply burner. Means, hot water temperature detecting means for detecting the temperature of hot water supplied through the hot water supply circuit, hot water temperature detected by the hot water temperature detecting means, capacity of the hot water heat exchanger, and heating amount of the hot water heat exchanger, Water temperature calculation value calculation means for calculating the temperature of hot water introduced into the auxiliary heat source device as a water supply temperature calculation value based on the above, and the combustion control means of the auxiliary heat source device when the hot water supply is started Previous Combustion of the hot water supply burner is started, the water supply temperature calculation value obtained by the water supply temperature calculation value calculation means is monitored, and hot water at the hot water supply set temperature is supplied from the main heat source based on the temperature rise of the water supply temperature calculation value. A structure for stopping combustion of the hot water supply burner when it is determined that the heat source apparatus has been introduced after reaching the heat source device is used as means for solving the problem.

  Further, in the second invention, in addition to the configuration of the first invention, the hot water burner combustion control by the combustion control means based on the feed water temperature calculation value obtained by the feed water temperature calculation value calculation means and a predetermined temperature change amount. A control feed water temperature calculating means for obtaining a control feed water temperature for combustion, and the combustion control means reaches a predetermined combustion stop reference temperature difference by subtracting the control feed water temperature from the feed water temperature calculation value. When the temperature has been exceeded or exceeded, a configuration for determining that hot water at a hot water supply set temperature has been introduced from the main heat source into the auxiliary heat source device is used as means for solving the problem.

  Further, in the third invention, in addition to the structure of the second invention, the combustion stop reference temperature difference is a value obtained by adjusting a difference obtained by subtracting the control water supply temperature from the hot water supply set temperature with a predetermined misfire coefficient. It is a means to solve the problem.

  Furthermore, in the fourth aspect of the invention, in addition to the configuration of the first, second or third aspect of the invention, hot water introduced into the hot water supply circuit is not passed through the hot water supply heat exchanger in the hot water supply circuit of the auxiliary heat source device. A bypass passage for supplying hot water is provided, and a bypass opening / closing valve is provided in the bypass passage so that a distribution ratio of hot water introduced into the hot water supply circuit to the hot water heat exchanger side and to the bypass passage side are provided. The flow rate is controlled within a predetermined rate change range by opening and closing of the bypass on-off valve, and after the hot water supply burner is stopped, the flow rate to the bypass passage side is the maximum within the rate change range. It is characterized by having a bypass on-off valve control means for controlling the bypass on-off valve.

  Furthermore, in addition to the structure of the invention described in any one of the first to fourth aspects, the fifth invention is such that the hot water supply temperature immediately after the hot water supply burner is stopped is higher than the hot water supply set temperature immediately before the hot water supply burner is stopped. Further, the present invention is characterized in that hot water supply burner combustion resumption command means is provided for resuming combustion of the hot water supply burner by combustion control means when the temperature falls below a predetermined hot water supply resumption reference temperature.

  Furthermore, the sixth aspect of the invention, in addition to the configuration of any one of the first to fifth aspects of the invention, is that the main heat source has a hot water storage tank, and a hot water passage and a water supply passage discharged from the hot water storage tank are provided. A merging portion is provided to join, mixing means for mixing the hot water from the hot water passage and the water from the water supply passage to be joined at the merging portion, and assisting the hot water formed by mixing by the mixing means It has a hot water introduction passage to be introduced into the 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 through the junction by controlling the mixing means.

  According to the present invention, when the hot water introduction side of the hot water supply circuit of the auxiliary heat source device provided with the hot water supply heat exchanger is connected to the downstream side of the hot water passage discharged from the main heat source and hot water supply is started, the auxiliary heat source Hot water in the hot water supply circuit of the auxiliary heat source device and hot water in the passage (pipe) connecting the main heat source and the auxiliary heat source device are heated by starting combustion of the hot water supply burner in the device and heating the hot water heat exchanger. Even when the temperature is lower than the hot water supply set temperature, the hot water can be heated to a hot water supply set temperature or a temperature close thereto to supply hot water.

  Further, the hot water temperature detecting means provided in the auxiliary heat source device detects the temperature of the hot water supplied through the hot water supply circuit (hot water temperature), the hot water temperature, the capacity of the hot water heat exchanger, and the hot water heat exchanger. Based on the amount of heating, the feed water temperature calculation value calculation means calculates the temperature of the hot water introduced into the auxiliary heat source device by calculation and uses it as the feed water temperature calculation value (feed water temperature recognition value). The temperature of this feed water temperature calculation value Based on the rise, it is determined that hot water at a hot water supply set temperature reaches the auxiliary heat source device from the main heat source and is introduced, and the combustion of the hot water burner is stopped, thereby introducing the hot water at the hot water set temperature into the auxiliary heat source device. Can be accurately determined, and the hot water supply burner is stopped at the appropriate timing, thereby preventing the hot water temperature from overshooting.

  In other words, in the present invention, the combustion control of the hot water burner in the auxiliary heat source device can be performed even if the auxiliary heat source device is not provided with means for detecting the incoming temperature (feed water temperature) of the hot water introduced into the auxiliary heat source device. In addition, the feed water temperature calculation value calculation means obtains the feed water temperature by calculation (calculates the feed water temperature calculation value). The timing at which the feed water temperature calculation value obtained by this calculation rises and changes as described below, for example, is mainly used. By determining that the hot water at the hot water supply set temperature reaches the auxiliary heat source device from the heat source and is introduced, the timing at which the hot water at the hot water set temperature reaches the auxiliary heat source device from the main heat source and is introduced accurately is determined. I can judge. This has been found by the inventors through experiments.

  Specifically, the control feed water temperature for hot water burner combustion control by the combustion control means is obtained based on the calculated feed water temperature value and a predetermined temperature change amount. This control water temperature is, for example, a temperature change that is predetermined to the previously determined control water temperature when the calculated feed water temperature value is detected every predetermined sampling time, for example, every 200 ms (0.2 seconds). The amount is calculated, and when the feed water temperature calculation value detected at each sampling time is decreasing, it is obtained by subtracting a predetermined temperature change amount from the previously obtained control feed water temperature. . That is, even if the feed water temperature calculation value changes greatly, the control feed water temperature changes only by a predetermined temperature change amount.

  When the temperature difference obtained by subtracting the control feed water temperature from the feed water temperature calculation value reaches a predetermined combustion stop reference temperature difference (the differential value of the feed water temperature calculation value exceeds a predetermined set value as a predetermined value) It is determined that hot water at a hot water supply set temperature has been introduced into the auxiliary heat source device from the main heat source. If such a technique is used to detect a sign (initial state of fluctuation) when hot water having a hot water supply set temperature is introduced into the auxiliary heat source device, the burner combustion is stopped. It is possible to prevent overshoot that occurs when the fire is extinguished after confirming that hot water at the hot water supply set temperature has been introduced into the auxiliary heat source device by a predetermined value increase in the water supply temperature. Note that if the sampling time is 1 s (1 second) or longer, it will be delayed to catch the sign, so the sampling time may be set to a value smaller than 1 s (1 second).

  When judging the timing when hot water of the hot water supply set temperature from the main heat source arrives at the auxiliary heat source device and introduces it, it is possible to catch such a sign as described above, for example, as an auxiliary heat source device such as a water heater. It becomes even more important when using models (models that not only increase the amount of gas consumed but also have a low water flow resistance and a high maximum capacity). The reason for this is that a model with such a high hot water supply capacity has a higher flow velocity in the auxiliary heat source device, so it is more important to follow this speed. This is because it is necessary to control the combustion stop timing of the hot water supply burner.

  The combustion stop reference temperature difference may be a value (for example, a value obtained by dividing a difference obtained by subtracting the control water supply temperature from the hot water supply set temperature by a predetermined misfire coefficient. That is, assuming that the combustion stop reference temperature difference is TinDiff, the hot water supply set temperature (main body set temperature) is Ts, the control feed water temperature is Tc, and the misfire coefficient is K, the combustion stop reference temperature difference TinDiff is expressed by, for example, the following equation (1) ).

TinDiff = (Ts−Tc) / K (1)

  The misfire coefficient is a correction value for optimizing misfire timing. For example, whether or not overshoot or undershoot occurs in the hot water supply temperature, or whether it is within an allowable range even if the hot water supply temperature occurs. The value obtained by subtracting the control water supply temperature from the set temperature (Ts-Tc), the length of the hot water introduction passage, the material of the hot water introduction passage (for example, resin such as polyethylene, metal such as copper or iron), outside temperature , Experiment in advance by changing various factors such as hot water flow rate (other conditions such as the hot water supply capacity of the auxiliary heat source device may be added as a factor), and overshoot and undershoot will not occur Or, it is obtained and given in advance as a correction value so as to be within the allowable range even if it comes out.

  The misfire coefficient may be, for example, a value that changes linearly according to at least one of the above factors, or may be a value that changes in a curved line, and the misfire coefficient is obtained from, for example, the above-described factor or table. It may be a stepped coefficient (which changes stepwise with respect to at least one of the factors).

  In addition, as described above, the present inventor has a hot water supply set temperature from the main heat source to the auxiliary heat source device when the temperature difference obtained by subtracting the control feed water temperature from the feed water temperature calculated value becomes a predetermined combustion stop reference temperature difference. It is confirmed by changing various conditions that it is possible to accurately determine the combustion stop timing of the hot water burner by determining that the hot water has reached and determining the combustion stop timing of the hot water burner.

  Further, according to the present invention, the main heat source and the auxiliary heat source device are determined because the introduction timing of the hot water supply set temperature to the auxiliary heat source device is determined without performing communication between the main heat source side and the auxiliary heat source device side. Means (communication line or the like) for communicating with each other is unnecessary, and the cost can be reduced accordingly. In addition, when the auxiliary heat source device is replaced, it is not necessary to change the setting on the main heat source side, so there is no problem even if the contractor does not have the construction manual on the main heat source side when constructing the auxiliary heat source device. .

  In addition, a bypass passage provided with a bypass opening / closing valve is provided in the hot water supply circuit of the auxiliary heat source device, and after the hot water supply burner is stopped, the bypass opening / closing valve is set so that the flow rate to the bypass passage becomes the maximum within the ratio change range. By controlling and supplying hot water from the main heat source mainly through the bypass passage, hot water can be supplied without being affected by the heat of the hot water supply heat exchanger as much as possible.

  In other words, even if the hot water supply burner is stopped, the temperature of the hot water heat exchanger heated before the stop of combustion does not decrease immediately, so the hot water passing through the hot water heat exchanger does not receive heat from the hot water heat exchanger. Although it absorbs heat and rises, by reducing the proportion of hot water that is supplied from the main heat source to the auxiliary heat source device side through the hot water supply heat exchanger side and increasing the proportion of hot water that is supplied through the bypass passage side The influence of the heat of the hot water supply heat exchanger can be reduced and the hot water supply temperature overshoot can be prevented more appropriately.

  During combustion of the hot water supply burner, for example, the flow rate of hot water introduced into the hot water supply circuit to the hot water supply heat exchanger side is set to a maximum value or a value close to the maximum value within a predetermined rate change range. By controlling the bypass open / close valve, the hot water supply heat exchanger can be heated by the hot water supply burner to efficiently form hot water at the hot water supply set temperature.-

  Furthermore, even if the hot water burner is stopped, the hot water temperature immediately after the hot water burner is higher than the hot water temperature immediately before the hot water burner is stopped. When the temperature falls below a predetermined hot water resumption reference temperature (for example, 3 ° C. or more) lower than the temperature, combustion of the hot water burner is stopped earlier than hot water at the hot water supply set temperature reaches the auxiliary heat source device from the main heat source and is introduced. It is thought that it has stopped. Therefore, when the hot water supply temperature immediately after stopping the hot water supply burner is lower than the set hot water supply temperature immediately before stopping the hot water supply burner by more than the hot water supply restart reference temperature (for example, 3 ° C. or higher), the hot water burner is restarted by resuming combustion. In addition, it is possible to suppress the undershoot of the hot water temperature due to the state where the combustion of the hot water burner is stopped for a long time, and the hot water temperature can be further stabilized.

  Further, even when a part of the hot water introduction passage is warmed by the sun, it is assumed that the combustion of the hot water burner is erroneously stopped early. Of the hot water supply burner may be resumed (for example, when the hot water temperature decreases due to the introduction of water that has not been warmed by the western day after the water warmed by the western day is introduced). .

  Furthermore, by providing a main heat source having a hot water storage tank, hot water formed using, for example, solar heat or waste heat from a fuel cell can be stored in the hot water storage tank and efficiently used. And a mixing means for combining a hot water passage and a water supply passage discharged from a hot water storage tank of a main heat source having a hot water storage tank at a joining portion, and mixing the hot water and water to be joined at the joining portion, and the mixing By providing a hot water introduction passage for introducing hot water mixed by the means into the auxiliary heat source device, and controlling the mixing means to control the flow rate of hot water and the flow rate of the water, It is possible to appropriately control the temperature of the hot water that is formed and fed to the auxiliary heat source device side, and it is possible to stabilize the hot water supply temperature.

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 a graph which shows the water supply temperature calculation value at the time of hot water supply of the heat source apparatus of an Example, the water supply temperature for control, the temporal change of hot water supply temperature, and the example of misfire timing with the water supply temperature actual value calculated | required for experiment. It is explanatory drawing for demonstrating the system configuration example of the heat source apparatus in an Example and development. FIG. 4 is a system configuration diagram showing a partial configuration of FIG. 3 in a simplified manner in order to explain a hot water circulation passage and a hot water discharge passage of a hot water storage tank provided in the heat source device shown in FIG. 3. It is explanatory drawing which shows typically the example of distribution of the temperature layer in a hot water storage tank. It is a typical graph which shows the temporal change example of the feed water temperature calculation value by the difference in the outside temperature at the time of hot water supply of a heat source device, and the feed water temperature for control.

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

  FIG. 1 is a block diagram showing a main part control configuration of an embodiment of a heat source device according to the present invention. This embodiment has the same system configuration as that of the heat source device shown in FIG. 3, and further, as shown in FIG. 1, the control device 46 of the hot water heater 16 includes a combustion control means 47, and a water supply temperature calculation value calculation. Means 71, control feed water temperature calculation means 72, memory unit 73, bypass on-off valve control means 74, hot water supply burner combustion restart command means 75 are provided, and combustion control means 47 includes hot water supply set temperature setting operation means 45. The remote control device 43 is connected. The remote control device 43 is installed indoors at an appropriate place such as a living room, a bathroom, a kitchen, or a washroom.

  Further, the control device 33 in the tank unit 4 is provided with a mixing flow rate control means 35 and a mixing set temperature setting means 36, and the control device 33 is signal-connected to the remote control device 43. Can transmit and receive information to and from the remote control device 43.

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

  The flow rate detection means 42 detects the hot water flow rate supplied through the hot water supply passage 18. Then, the flow rate detection means 42 adds a detection flow rate (detection value) of the hot water supply flow rate to the combustion control means 47 of the control device 46. Further, the hot water supply flow sensor 29 also detects the hot water supply flow rate supplied through the hot water supply passage 18, and adds the detected flow rate (detected value) of the hot water supply flow rate to the mixing flow rate control means 35 of the control device 33.

  The mixing flow rate control means 35 controls the flow rate of hot water flowing from the outlet passage 9 to the junction 10 side and the flow rate of water flowing from the water supply passage 8b to the junction 10 side, and is set by the set mixing temperature setting means 36. The mixed hot and cold water is formed at the junction 10.

  The mixed set temperature setting means 36 sets a set temperature (mixed set temperature) of the mixed hot water. For example, when the detected temperature of the hot water temperature detecting means 5a in the hot water tank is higher than the threshold value, The mixing set temperature is set to correspond to the hot water supply set temperature, for example, the same value as the hot water supply set temperature or higher than that by 0.5 ° C. Note that the mixing set temperature setting means 36 sets the mixing set temperature to an appropriate temperature lower than the hot water supply setting temperature when the temperature detected by the hot water tank temperature detection means 5a is equal to or lower than the threshold value.

  The mixing flow rate control means 35 opens the tank side electromagnetic valve 13 when the hot water flow rate supplied through the hot water supply passage 18 is detected by the feed water flow rate sensor 29, and controls 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 in the merging portion 10 is controlled to be the mixing set temperature set by the mixing set temperature setting means 36. Hot water having a set mixing temperature formed by this control is introduced into the hot water supply circuit 62 of the hot water heater 16 through the hot water introduction passage 15.

  The water supply temperature calculation value calculation means 71 provided in the control device 46 of the water heater 16 includes a hot water supply temperature detected by the hot water supply temperature detection means 76, a heating amount of the hot water supply heat exchanger 17, and a hot water supply heat exchanger 17. Based on the capacity and the bypass ratio between the hot water supply heat exchanger 17 and the bypass passage 68, the temperature of the hot water introduced into the hot water heater 16 is calculated as a supply water temperature calculation value (recognition value). The method of this calculation is not particularly limited, but it is obtained by taking a moving average every unit time such as 0.5 seconds.

  For example, the water supply temperature calculation value at the sampling time is Tin, the hot water supply temperature is Tout, the capacity of the hot water supply heat exchanger 17 is Q, the heating amount of the hot water supply heat exchanger 17 is H, and the bypass ratio between the hot water supply heat exchanger 17 and the bypass passage 68 And Br, the water supply temperature calculation value Tin at each sampling time is calculated by the following equation (2). In addition, the bypass ratio Br in the formula (2) is a branching ratio to the hot water supply heat exchanger 17 side when hot water introduced into the water heater 16 flows separately on the hot water supply heat exchanger 17 side and the bypass passage 68 side. (Branch rate) (the bypass ratio on the hot water supply heat exchanger 17 side), and Br = 1 when flowing almost 100% to the hot water supply heat exchanger 17 side. Further, for example, when flowing in the hot water supply heat exchanger 17 and the bypass passage 68 at a ratio of 1: 3, Br = 0.25.

Tin = Tout−H / (Q ・ Br) (2)

  And the average (arithmetic mean) of the value calculated | required by Formula (2) in the first sampling time and the value calculated | required by Formula (2) in the 2nd sampling time is taken, and the feed water temperature in the 2nd sampling time Calculated value (recognized value). After the third sampling time, take the average (arithmetic mean) of the water supply temperature calculation value obtained at the previous sampling time and the value calculated by Equation (2) at the current sampling time, and use that value as the current value. An example of the time series data of the water supply temperature calculation value in this embodiment is shown by the characteristic line a in FIG.

  In addition, the value at the first sampling time at the time of re-watering after stopping hot water supply may be, for example, a water supply temperature calculation value obtained at the last sampling time before hot water supply stop, instead of the value obtained by Equation (2). For example, it is good also as a value which correct | amended the water supply temperature calculation value calculated | required by the last sampling time according to the time from hot water supply stop to re-watering.

  The feed water temperature calculation value obtained by the feed water temperature calculation value calculation means 71 is sequentially added to the control feed water temperature calculation means 72 and the combustion control means 47.

  The control feed water temperature calculation means 72 is based on the feed water temperature calculation value obtained by the feed water temperature calculation value calculation means 71 and a predetermined temperature change amount (temperature increase amount or temperature decrease amount), and a hot water supply burner by the combustion control means 47. 61 is a means for obtaining a control feed water temperature for 61 combustion control. Note that the value of the temperature change amount is stored in the memory unit 73.

  In calculating the control water temperature, the control water temperature calculation means 72 uses, for example, a water temperature calculation value calculated by the equation (2) at the first sampling time as an initial value, and supplies water at that value and the second sampling time. The water supply temperature calculation value obtained by the temperature calculation value calculation means 71 is compared. When the second water supply temperature calculation value is larger than the water supply temperature calculation value at the first sampling time, a temperature increase given in advance (for example, 0.1 ° C. every 0.5 seconds) is calculated. When the feed water temperature calculation value at the first sampling time is added to the control feed water temperature at the second sampling time, and the second feed water temperature calculation value is smaller than the feed water temperature calculation value at the first sampling time Then, a temperature increase given in advance (for example, 0.1 ° C. every 0.5 seconds) is subtracted from the feed water temperature calculation value at the first sampling time to obtain the control feed water temperature at the second sampling time.

  Thereafter, the control feed water temperature calculation means 72 compares the previous feed water temperature calculation value obtained by the feed water temperature calculation value calculation means 71 with the current feed water temperature calculation value at each sampling time, and calculates the previous feed water temperature calculation. If the current water supply temperature calculation value is larger than the current value, the temperature increase is added to the previous control water supply temperature to obtain the current control water temperature, which is greater than the previous water supply temperature calculation value. When the calculated feed water temperature is smaller, the temperature drop is subtracted from the previous control feed water temperature to obtain the current control feed water temperature. The characteristic line b in FIG. 2 shows an example of time-series data of the control feed water temperature in this embodiment. The value of the control feed water temperature obtained by the control feed water temperature calculation means 72 is sequentially added to the combustion control means 47.

  Note that the value at the first sampling time at the time of re-watering after the hot water supply stop may be, for example, the control water supply temperature obtained at the last sampling time before the hot water supply stop, instead of the value obtained by the equation (2). For example, it may be a value obtained by correcting the control feed water temperature obtained at the last sampling time in accordance with the time from hot water supply stop to re-draining.

  The combustion control means 47 starts combustion of the hot water supply burner 61 when the minimum flow rate of the hot water supply burner 61 is detected by the flow rate detection means 42, and is based on the control feed water temperature obtained by the control feed water temperature calculation means 72. Feed forward combustion control of the hot water supply burner 61 is performed. Thus, accurate feedforward combustion control can be performed by using the control feed water temperature. Further, in the present embodiment, the water heater 16 can reduce the cost by not providing a detection sensor for the incoming water temperature (water supply temperature).

  When the difference between the control water supply temperature and the hot water supply set temperature is equal to or lower than a predetermined combustion unnecessary temperature range (eg, 3 ° C.), the hot water supply burner 61 is not combusted even when hot water supply is started. In addition, when the difference between the control water supply temperature and the hot water supply set temperature becomes equal to or less than the combustion unnecessary temperature range after the start of hot water supply, To stop.

  Further, as described above, when the flow rate of hot water supplied through the hot water supply passage 18 is detected by the water supply flow rate sensor 29, the control unit 33 on the tank unit 4 side has the mixing flow rate control means 35 provided with the tank side solenoid valve. 13, and when the temperature detected by the hot water temperature detection means 5 a in the hot water tank is higher than the threshold, hot water having a hot water supply set temperature (or a temperature higher by 0.5 ° C. than the hot water set temperature) is formed. To the side of the container 16. Therefore, it is not necessary to additionally heat the hot water on the hot water heater 16 side, but it takes time until the hot water reaches the hot water heater 16 side, and during that time, the passage in the hot water supply circuit 62 of the hot water heater 16 and the introduction of hot water are introduced. Since the water in the passage 15 needs to be heated by the hot water supply heat exchanger 17, the water in the hot water supply circuit 62 and the water in the hot water introduction passage 15 are heated by the hot water supply heat exchanger 17 by the combustion of the hot water supply burner 61 as described above. Heat.

  The combustion control means 47 monitors the feed water temperature calculation value obtained by the feed water temperature calculation value calculation means 71 during the combustion control of the hot water supply burner 61, and based on the temperature rise of the feed water temperature calculation value, When it is determined that hot water at a hot water supply set temperature has reached the hot water heater 16 and has been introduced from a hot water tank 2, the combustion of the hot water burner 61 is stopped. By stopping the combustion of the hot water supply burner 61, it is possible to prevent excessive additional heating from being performed after the hot water at the hot water supply set temperature reaches the hot water supply circuit 62.

  Specifically, the combustion control unit 47 subtracts the control feed water temperature Tc obtained by the control feed water temperature calculation unit 72 from the feed water temperature computation value Tb obtained by the feed water temperature computation value calculation unit 71 ( When (Tb−Tc) reaches or exceeds a predetermined combustion stop reference temperature difference TinDiff, it is determined that hot water at a hot water supply set temperature has been introduced from the hot water storage tank 2 into the water heater 16. In the embodiment, the combustion stop reference temperature difference TinDiff is obtained by the equation (1). Note that the misfire coefficient is obtained in advance through experiments or the like and stored in the memory unit 73. For example, the misfire coefficient K = 5.

  For example, in FIG. 2, when the hot water supply set temperature is 40 ° C. and the misfire coefficient K = 5, the combustion stop reference temperature difference TinDiff is TinDiff = (40−Tc) ÷ 5 from the equation (1). When the feed water temperature Tc is 22 ° C, the combustion stop reference temperature difference TinDiff is 3.6 ° C. When the control feed water temperature Tc is 20 ° C, the combustion stop reference temperature difference TinDiff is 4 ° C and the control feed water temperature Tc is 18 ° C. In this example, the combustion stop reference temperature difference TinDiff changes to 4.4 ° C., but in this example, when the control feed water temperature Tc is about 20 ° C., the temperature difference obtained by subtracting the control feed water temperature from the feed water temperature calculation value. Is about 4 ° C., and it matches or exceeds the combustion stop reference temperature difference TinDiff = 4 ° C. when Tc = 20 ° C. Therefore, it is determined that hot water of the hot water set temperature is introduced from the hot water storage tank 2 into the water heater 16. The combustion of the hot water supply burner 61 is stopped.

  In FIG. 2, the measured value of the feed water temperature detected for the experiment is shown in the characteristic line d, and the combustion stop timing of the hot water supply burner 61 and the actual feed water temperature have reached 40 ° C., which is the preset hot water temperature. The timing matches. That is, it is proved that the combustion stop timing of the hot water supply burner 61 is appropriate, and at this time, the overshoot of the hot water supply temperature indicated by the characteristic line c is also about 2 ° C. It was found to be an acceptable range.

  Further, in the present embodiment, the difference in the combustion reference temperature, which is the reference for stopping the combustion of the hot water supply burner 61, for determining that the hot water at the hot water supply temperature from the hot water storage tank 2 has been introduced into the hot water heater 16 is set to the hot water supply set temperature as described above. By changing correspondingly, the stop timing of the hot water supply burner 61 can be determined more appropriately as described below.

  For example, the increase width of the water supply temperature calculation value varies depending on the temperature difference between the actual water supply temperature (the temperature of the water actually introduced into the water heater 16) and the hot water supply set temperature. And the control feed water temperature also varies depending on the hot water supply set temperature. That is, for example, when the actual water supply temperature is constant, if the hot water supply set temperature is set high and the temperature difference between the water supply temperature and the hot water supply set temperature is large, the increase range of the water supply temperature calculation value increases, and the water supply temperature calculation value The difference from the control water temperature increases. If the combustion stop reference temperature difference is set to be small, the stop timing of the hot water supply burner 61 is determined earlier, and the hot water supply burner is reached before hot water at the hot water supply set temperature reaches the hot water supply circuit 62 side from the hot water storage tank 2 side. However, as described above, the stop timing of the hot water supply burner 61 is determined earlier by setting the combustion stop reference temperature difference to a value corresponding to the set hot water temperature. Can be prevented.

  That is, as apparent from the equation (1), when the hot water supply set temperature is high, the combustion stop reference temperature difference TinDiff is set to be large. If the difference between the hot water temperature and the control water temperature does not increase, it is not determined that the hot water at the hot water set temperature (including the temperature close to the hot water set temperature) has reached the hot water supply circuit 62 side from the hot water tank 2 side. The hot water supply burner 61 can be stopped at an appropriate timing by appropriately determining the timing at which the hot water reaches.

  Conversely, for example, when the actual feed water temperature is constant, if the hot water set temperature is set low and the temperature difference between the actual feed water temperature and the hot water set temperature is small, the increase in the feed water temperature calculation value will be small. The difference between the feed water temperature calculation value and the control feed water temperature becomes small. Here, if the combustion stop reference temperature difference is set large, the judgment of the stop timing of the hot water supply burner 61 is delayed, and the hot water supply burner 61 continues to burn even when hot water at the hot water supply set temperature reaches the hot water supply circuit 62 side from the hot water storage tank 2 side. However, as described above, when the hot water supply set temperature is low, the combustion stop reference temperature difference is set to a small value as described above. Therefore, when the difference between the calculated value of the feed water temperature and the control feed water temperature becomes equal to or larger than the small combustion stop reference temperature difference, the hot water set temperature (the hot water set temperature) It is determined that the hot water at the hot water supply temperature reaches the hot water supply circuit 62 side from the hot water storage tank 2 side, and the hot water supply burner is appropriately determined. It is possible to stop the 1.

  For example, in the case of re-watering, let us consider a case where the hot water supply set temperature at the previous hot water supply is 40 ° C. and the hot water supply set temperature at the current hot water supply is 60 ° C. In this case, when the time from the previous hot water supply stop to the re-heated hot water is short, the temperature of the hot water in the connecting pipe between the hot water tank 2 side and the hot water heater 16 is around 40 ° C., and 40 ° C. The hot water is introduced into the hot water supply circuit 62 of the hot water heater 16, but at that time, the hot water supply burner 61 is combusted.

  And by changing the hot water supply set temperature from 40 ° C. to 60 ° C., the temperature difference between the actual hot water temperature and the hot water set temperature, which is the temperature of the hot water to be introduced, increases. In addition, the combustion stop reference temperature difference is set to a large value corresponding to the hot water supply set temperature, so that the increase in the water supply temperature calculation value that increases according to the change in the hot water set temperature and the change in the hot water set temperature Since correspondence with a large combustion stop reference temperature difference can be achieved, when hot water of 60 ° C. sent from the hot water storage tank 2 side is introduced into the hot water supply circuit 62 of the hot water heater 16, the arrival of hot water of 60 ° C. Can be appropriately determined, and the stop timing of the hot water supply burner 61 can be appropriately determined.

  In addition, when the heat source device is operated for the first time, or when the time until the re-heating of the hot water after the previous hot water supply is long, the hot water in the connecting pipe connecting the hot water storage tank 2 side and the hot water heater 16 side is cooled down, and the hot water heater 16 When the actual feed water temperature (incoming water temperature) is low, such as during hot water supply when the feed water temperature is low (during cold start), the control feed water temperature also becomes a low value, and from the equation (1) Obviously, since the combustion stop reference temperature difference is set large, the combustion stop timing of the hot water supply burner 61 is delayed as compared with the case where the combustion stop reference temperature difference is small. In other words, when the combustion stop timing of the hot water supply burner 61 is carefully determined and hot water of the hot water supply set temperature reaches from the hot water storage tank 2 side reliably, the combustion stop timing of the hot water supply burner 61 is determined and an appropriate timing is reached. Thus, the combustion of the hot water supply burner 61 is stopped.

  On the other hand, when the actual feed water temperature (inlet water temperature) is high, the feed water temperature calculation value is also high and the control feed water temperature is also high, and as is clear from the equation (1), combustion Since the stop reference temperature difference is set to be small, the combustion stop timing of the hot water supply burner 61 is earlier than in the case where the combustion stop reference temperature difference is large. That is, when the incoming water temperature is high, the overshoot that occurs when the determination of the combustion stop timing of the hot water supply burner 61 is delayed increases, so the hot water supply burner 61 is combusted at an appropriate timing so that the large overshoot does not occur. A stop is made.

  Further, when the outside air temperature at which the heat source device is arranged is low, the temperature fluctuation of the feed water temperature is large, and the fluctuation of the feed water temperature calculation value is also large as indicated by the characteristic line a in FIG. The drop in temperature shown in is large.) Further, when the outside air temperature is low, for example, as shown by the characteristic line b in the figure, the control feed water temperature becomes lower and the combustion stop reference temperature difference is set to be larger, so that the combustion stop reference temperature is temporarily set. It is possible to prevent the hot water supply burner 61 from being stopped before the hot water at the hot water supply set temperature reaches the water heater 16, as in the case where the difference is made small, and an undershoot with a large hot water temperature occurs. Can prevent the user from feeling uncomfortable.

  On the other hand, as shown in FIG. 6B, since the temperature fluctuation of the feed water temperature is small when the outside air temperature is high, the fluctuation of the feed water temperature calculation value as shown by the characteristic line a is also small (shown in C of FIG. 6). The temperature drop is small), and as shown by the characteristic line b in FIG. In this case, since the combustion stop reference temperature difference is set to be small, the combustion stop timing of the hot water supply burner 61 is not judged late, and the occurrence of a large overshoot of the hot water supply temperature is suppressed. The When the incoming water temperature is high, the hot water supply temperature does not drop rapidly even if the fire is accidentally extinguished by reducing the combustion stop reference temperature difference.

  As described above, in this embodiment, whether or not the hot water supply set temperature is high or low, whether the actual water supply temperature is low or high, whether the outside air temperature is low or high, in any case, It is possible to appropriately determine the timing at which hot water of the hot water supply set temperature reaches the hot water supply circuit 62 of the water heater 16, and to stop combustion of the hot water supply burner 61 at an appropriate timing, so that the hot water temperature can be stabilized.

  In the embodiment, when the hot water flow rate to be supplied through the hot water supply passage 18 is detected by the water supply flow rate sensor 29, the mixing flow rate control means 35 of the controller 33 on the tank unit 4 side is used as the tank side electromagnetic valve 13. When the temperature detected by the hot water temperature detecting means 5a in the hot water tank is higher than the threshold, hot water having a hot water supply set temperature (or a temperature higher than the hot water set temperature by 0.5 ° C.) is formed in the junction 10. However, at this time, the temperature of the hot water formed in the merging portion 10 may be gradually increased so as to reach the hot water supply set temperature or the vicinity thereof.

  Further, in this embodiment, the bypass opening / closing valve control means 74 takes in the control information of the combustion control means 47, closes the bypass electromagnetic valve 69 during combustion of the hot water supply burner 61, and the flow rate to the hot water supply heat exchanger 17 side is increased. After the hot water supply burner 61 is stopped so that the maximum value within the predetermined rate change range or a value close to the maximum value can be obtained, that is, the hot water supply heat exchanger 17 can be passed almost 100%. The distribution ratio to the bypass passage 68 side is maximized within the ratio change range, that is, here, the bypass solenoid valve 69 is completely opened, and for example, hot water introduced into the hot water supply circuit 62 is supplied to the hot water supply heat exchanger. It is made to pass at a ratio such that the ratio of the 17 side to the bypass passage 68 side is 1: 3. This makes it less likely to be affected by the residual heat of the hot water supply heat exchanger 17 after the hot water supply burner 61 stops combustion, and further stabilizes the hot water supply temperature.

  The hot water supply burner combustion restart command means 75 takes in the control information of the combustion control means 47 and the detected temperature of the hot water supply temperature detection means 76, and the hot water temperature immediately after the hot water supply burner 61 is stopped is the hot water supply immediately before the hot water supply burner 61 is stopped. When the temperature is lower than the preset temperature by a predetermined hot water supply restart reference temperature (for example, 3 ° C.) or more, the combustion control means 47 restarts the combustion of the hot water supply burner 61.

  That is, even if the hot water supply burner 61 is stopped, the hot water supply temperature immediately after the hot water supply burner 61 is higher than the hot water supply temperature immediately before the hot water supply burner 61 is stopped. When the hot water supply resumption reference temperature (for example, 3 ° C.) is lower than the hot water supply resumption reference temperature just before the stop, the hot water supply burner 61 is turned on earlier than hot water at the hot water supply set temperature reaches the water heater 16 and is introduced from the hot water storage tank 2 side. Since it is considered that the combustion has been stopped, the combustion control means 47 restarts the combustion of the hot water supply burner 61 in response to a command from the hot water supply burner combustion restart command means 75 at this time, thereby stabilizing the hot water temperature. Can do.

  In addition, this invention is not limited to the said Example, It sets suitably. For example, the combustion control means 47 monitors the feed water temperature calculation value obtained by the feed water temperature calculation value calculation means 71 during the combustion control of the hot water supply burner 61, and is a main heat source based on the temperature rise of the feed water temperature calculation value. When it is determined that hot water at a hot water supply set temperature reaches the hot water heater 16 from the hot water storage tank 2 and is introduced, the combustion of the hot water burner 61 may be stopped. For example, it may be performed when the rising gradient of the water supply temperature calculation value is equal to or higher than a predetermined reference gradient, without being performed based on the difference between the water supply temperature calculation value and the control water supply temperature.

  Further, in the embodiment, when the temperature difference obtained by subtracting the control feed water temperature from the feed water temperature calculation value reaches a predetermined combustion stop reference temperature difference, the hot water at the hot water supply set temperature is supplied from the main heat source to the auxiliary heat source device. However, this timing is almost the same as when the differential value of the feed water temperature calculated value exceeds a predetermined value (predetermined set value). When the value exceeds a preset value, it may be determined that hot water at a hot water supply set temperature has reached the auxiliary heat source device from the main heat source and has been introduced.

  Furthermore, in the said Example, although the hot water heater 16 described what does not use the water supply thermistor which is a sensor for detecting a water supply flow volume, you may provide a water heater thermistor in the water heater 16. Also in this case, as a determination method for determining that hot water at a hot water supply set temperature has reached the auxiliary heat source device from the main heat source, the method as in the above embodiment may be applied, or the detected temperature of the water supply thermistor When the differential value of the detected temperature reaches or exceeds a predetermined criterion differential value based on the differential value, the hot water at the hot water supply set temperature reaches the auxiliary heat source device and is introduced from the main heat source. It can also be judged.

  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, However, instead of using a two-way valve, for example, a three-way valve may be provided at one place to adjust the mixing ratio.

  Moreover, in the said Example, although the water supply flow rate sensor 29 and the flow rate detection means 42 were provided separately, and both were provided in the heat-source apparatus, you may share in any one. For example, when only the flow rate detection means 42 is provided, the detection signal of the flow rate detection means 42 is also applied to the flow rate ratio detection means 38 and the mixing flow rate control means 35. Even when both the water supply flow rate sensor 29 and the flow rate detection unit 42 are provided, the detection signal of the flow rate detection unit 42 may be applied to the mixing flow rate control unit 35 and the like. Adding the detection signal from the sensor 29 eliminates the need for information interchange between the auxiliary heat source device such as the water heater 16 and the tank unit 4, and can simplify the control configuration.

  Furthermore, the hot water heater 16 may be a hot water heater of a type that heats the hot water supply heat exchanger 17 by, for example, an oil combustion type burner device.

  Furthermore, the present invention is also effective in a system (without the circulation pump 23 and the electromagnetic valve 24) in which the connection passages 21 and 22 are omitted in FIGS.

  Furthermore, a heat source device may be formed by providing a bypass path 79 and a bypass electromagnetic valve 80 as shown by a broken line in FIG. In such a configuration, the opening / closing control of the bypass solenoid valve 80, the mixing flow rate control means 35, and the like are performed as necessary so that the temperature after joining at the joining portion of the bypass passage 79 and the passage 28 becomes the hot water supply set temperature. The temperature control by the combustion control, the combustion control by the combustion control means 47, etc. are appropriately performed.

  Note that the branching ratio (bypass ratio) between the hot water supply passage 62 side and the bypass passage 79 side is set as appropriate, for example, 8: 2 or 5: 5. For example, the hot water introduction passage 15 is cooled. When hot water supply is started in the hot water supply burner 61 of the hot water heater 16, hot water does not pass through the bypass passage 79 side and combustion of the hot water supply burner 61 is stopped (that is, hot water at the hot water supply set temperature is supplied). It is possible to pass hot water through the bypass passage 79 side as well.

  Furthermore, in the said Example, although the hot water tank 2 was thermally connected to the fuel cell 1, you may connect a solar heat collector, a heat pump, etc. instead of the fuel cell 1. FIG.

  The heat source device of the present invention can stabilize the hot water supply temperature even without performing communication between the main heat source and the auxiliary heat source device, and can reduce the cost. It can be used as a heat source device.

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Hot water storage tank 3 Heat recovery passage 4 Tank unit 5 Hot water temperature detection means 8 in hot water storage tank 8, 8a, 8b Water supply passage 9 Hot water supply passage 10 Junction part 11 Hot water storage hot water temperature detection means 12 Tank hot water mixer 13 Tank side electromagnetic Valve 14 Water mixer 15 Hot water introduction passage 16 Water heater 17 Hot water heat exchanger 23 Circulation pump 24 Solenoid valve 28 Mixing thermistor 29 Feed water flow sensor 33 Controller 35 Mixing flow control means 36 Mixing set temperature setting means 42 Flow detection means 45 Hot water supply Set temperature setting operation means 47 Combustion control means 61 Hot water supply burner 62 Hot water supply circuit 66 Combustion chamber 67 Hot water supply heat outlet side temperature detection means 68 Bypass passage 69 Bypass solenoid valve 71 Supply water temperature calculation value calculation means 72 Control supply water temperature calculation means 73 Memory 74 Bypass valve control means 75 Hot water burner combustion Opening command means 76 hot water supply temperature detecting means

Claims (6)

  Hot water sent from the main heat source to the auxiliary heat source device is connected to the hot water supply side of the hot water supply circuit of the auxiliary heat source device provided with the hot water heat exchanger downstream of the passage of hot water discharged from the main heat source. A hot water supply burner for heating the hot water supply heat exchanger, combustion control means for controlling combustion of the hot water supply burner, and hot water supply through the hot water supply circuit. Hot water temperature detecting means for detecting the temperature of the hot water to be introduced, the hot water temperature detected by the hot water temperature detecting means, the capacity of the hot water heat exchanger, and the heating amount of the hot water heat exchanger are introduced into the auxiliary heat source device Water temperature calculation value calculation means for calculating the temperature of the hot water to be calculated as a water supply temperature calculation value, and when the hot water supply is started, the combustion control means of the auxiliary heat source device starts combustion of the hot water burner The hot water at the hot water set temperature reaches the auxiliary heat source device from the main heat source based on the temperature rise of the hot water temperature calculated value by monitoring the hot water temperature calculated value obtained by the hot water temperature calculated value calculating means. A heat source device that stops combustion of the hot water burner when it is determined that the hot water burner has been introduced.   There is a control water temperature calculation means for determining a control water temperature for hot water burner combustion control by the combustion control means based on a feed water temperature calculation value obtained by the feed water temperature calculation value calculation means and a predetermined temperature change amount, and combustion When the temperature difference obtained by subtracting the control feed water temperature from the feed water temperature calculation value reaches or exceeds a predetermined combustion stop reference temperature difference, the control means supplies hot water at a set hot water temperature from the main heat source to the auxiliary heat source device. The heat source device according to claim 1, wherein the heat source device is determined to have been introduced into the heat source device.   The heat source apparatus according to claim 2, wherein the combustion stop reference temperature difference is a value obtained by adjusting a difference obtained by subtracting the control water supply temperature from the hot water supply set temperature with a predetermined misfire coefficient.   The hot water supply circuit of the auxiliary heat source device is provided with a bypass passage for discharging hot water introduced into the hot water supply circuit without passing through the hot water heat exchanger, and the bypass passage is provided with a bypass on-off valve, The flow rate of the hot water introduced into the hot water supply circuit to the hot water heat exchanger side and the flow rate to the bypass passage side are controlled within a rate change range determined in advance by opening and closing of the bypass on-off valve. And a bypass on / off valve control means for controlling the bypass on / off valve so that a flow rate to the bypass passage side becomes maximum within the rate change range after the hot water supply burner is stopped. The heat source device according to any one of claims 1 to 4.   Hot water supply burner combustion resumption command for resuming combustion of the hot water supply burner by combustion control means when the hot water supply temperature immediately after stopping the hot water supply burner is lower than a predetermined hot water supply restart temperature than the hot water supply set temperature immediately before stopping the hot water supply burner The heat source device according to any one of claims 1 to 4, wherein means are provided.   The main heat source has a hot water storage tank, and is provided with a joining portion where a hot water passage and a water supply passage discharged from the hot water storage bath are joined, and the hot water from the hot water passage joined at the joining portion and the water supply passage A mixing means for mixing the water from the water, a hot water introduction passage for introducing hot water mixed by the mixing means into the auxiliary heat source device, and a flow rate of the hot water flowing through the junction by controlling the mixing means And a mixing flow rate control means for controlling the flow rate of water.

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