JP2019035512A - Heat source device with electricity generating function - Google Patents

Abstract

To provide a low-cost heat source device which efficiently generates electricity and utilizes heat.SOLUTION: Hot water in a hot water storage tank 2 is heated with waste heat of an electricity generating device 1 and stored. Heating is performed by thermally connecting a hot water circulation loop passage 131 which guides the hot water of the hot water storage tank 2 out from an upper side of the hot water storage tank 2 and returns the hot water to the hot water storage tank 2 from a lower side of the hot water storage tank 2 through a liquid-water heat exchanger 130 and a heating liquid circulation circuit 5 which circulates a liquid heat medium for heating through a heating device 10a to each other through the liquid-water heat exchanger 130. The hot water circulation loop passage 131 is provided with a bypass passage 135 which returns hot water storage tank-side return hot water, flowing from an outgoing side of the liquid-water heat exchanger 130 to the side of the hot water storage tank 2 to an incoming side of the liquid-water heat exchanger 130 without returning the hot water storage tank-side return hot water to the hot water storage tank 2, and the hot water storage tank-side return hot water is made to flow to the side of the bypass passage 135 without being returned to the side of the hot water storage tank 2 when the temperature of the hot water storage tank-side return hot water is equal to or higher than a bypass-side passage switching temperature, or to flow in a return direction to the side of the hot water storage tank 2 when the temperature of the hot water storage tank-side return hot water is lower than the bypass-side passage switching temperature.SELECTED DRAWING: Figure 3

Description

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

  Various hot water storage tanks (hot water storage tanks) for storing hot water in the tank and heat source devices including the hot water storage tanks have been proposed (see, for example, Patent Document 1). FIG. 7 shows a heat source including a hot water storage tank. An example of an apparatus is shown. The heat source device includes a power generation device 1 and a hot water storage tank 2, and the hot water storage tank 2 is disposed in a case in the hot water storage unit 104, for example. The power generation device 1 is formed by a fuel cell (FC) such as a polymer electrolyte fuel cell (PEFC) or a solid oxide fuel cell (SOFC), a gas engine, or the like. In the reverse reaction of decomposition, power is generated by reacting hydrogen extracted from fuel such as city gas with oxygen in the air.

  The power generation device 1 and the hot water tank 2 are thermally connected via a heat recovery passage 3, and the heat recovery passage 3 allows liquid (here, hot water) to flow between the power generation device 1 and the hot water storage tank 2. Circulation is performed as shown by arrows A and A ′ in the figure. For example, the heat recovery passage 3 passing through the power generation apparatus 1 is provided with a pump (not shown) that circulates a liquid (for example, water) in the heat recovery passage 3. Then, by driving the pump, the water in the hot water tank 2 is introduced into the power generation device 1 through the heat recovery passage 3 as shown by the arrow A ′ in the figure to be cooling water, and this water is used when the power generation device 1 generates power. After being heated by the generated exhaust heat, it passes through the heat recovery passage 3 as shown by an arrow A in the figure, and is stored in the hot water tank 2 as hot water having a temperature of, for example, 80 ° C. Note that a bypass passage 107 is connected to the heat recovery passage 3 via a three-way valve 106 so that the liquid flowing from the power generation device 1 side to the hot water storage tank 2 side can be passed through the hot water storage tank 2 as necessary. It is formed so that it can be returned to 1.

  In the hot water tank 2, a tank thermistor 35 as hot water temperature detecting means in the hot water tank 2 for detecting the temperature of hot water in the hot water tank 2 is provided in the vertical direction of the hot water tank 2 in the hot water tank 2 or on the outer wall of the hot water tank 2. A plurality (five in FIG. 7) are provided at intervals. The tank thermistor 35a provided at the uppermost position is lower than the upper end of the hot water tank 2 by a predetermined set length, that is, for example, when hot water is filled up to the upper end of the hot water tank 2. In addition, a hot water with a volume of less than 20 liters is provided at the surface of the hot water when the hot water tank 2 is introduced.

  The hot water passage 109 connected to the upper side of the hot water storage tank 2 is a passage for discharging (feeding) hot water formed in the hot water storage tank 2, and the hot water passage 109 includes a hot water passage 109. There are provided hot water storage tank hot water temperature detecting means 111 for detecting the temperature of hot water passing through the tank, a tank hot water / water mixer 112 for changing the amount of hot water fed through the hot water passage 109, and a tank side electromagnetic valve 47. The tank-side solenoid valve 47 is, for example, a pilot-type valve that switches the presence / absence of hot water supply through the hot water passage 109 by opening / closing the valve.

  Further, the water supply passage 108 to the heat source device is branched into a water supply passage 108a and a water supply passage 108b, one water supply passage 108 (108a) is connected to the lower side of the hot water tank 2, and the other water supply passage 108 is connected. (108b) is formed to join the hot water passage 109 at the hot water / merging section 110. The water supply passage 108b is provided with a water mixer 43 for changing the amount of water flowing from the water supply passage 108b to the hot water merging section 110 side. In this heat source device, mixing means for mixing hot water and water merged at the hot water / merging section 110 is formed having the water mixer 43 and the tank hot / cold water mixer 112. The water supply passage 108 is connected to the water supply.

  In FIG. 7, reference numeral 125 denotes an incoming water temperature thermistor, reference numeral 126 denotes an FC high temperature thermistor for detecting hot water temperature introduced from the power generator 1 to the hot water tank 2, and reference numeral 127 denotes the hot water tank 2 to the power generator 1 side. The derived FC low temperature thermistors for detecting hot and cold water temperature are respectively shown, and reference numeral 129 denotes a feed water flow rate sensor.

  A passage 118 communicates with the hot water / merging portion 110, and a mixing thermistor 128 is provided in the passage 118. The tank unit 104 uses hot water at a hot water supply set temperature set by using, for example, a remote control device. 109 and the passage 118 have a function of discharging hot water. A hot water introduction side of a water heater 116 as an auxiliary heat source device is connected to the passage 118 via a hot water introduction passage 115, and a hot water passage 109 and a passage from the hot water tank 2 as shown by an arrow B in FIG. Hot water fed through 118 (water fed from the tank unit 104) is introduced into the hot water supply circuit 162 of the hot water supply 116 through the hot water introduction passage 115 as indicated by an arrow B ″ in FIG.

  The hot water supply circuit 162 of the hot water heater 116 includes a hot water supply heat exchanger 29 that is heated by the combustion heat of the burner (hot water supply burner) 17, and in the same figure, the hot water supply heat exchanger 29 is the combustion gas of the hot water supply burner 17. It has a latent heat recovery heat exchanger 29a for recovering latent heat, and a main heat exchanger 29b that absorbs sensible heat of the combustion gas of the hot water supply burner 17. Thus, it is preferable to provide the heat exchanger 29a for recovering latent heat because the hot water heater 116 with high thermal efficiency can be formed.

  Although not shown in the figure, for example, when the hot water supply burner 17 is formed of a gas burner, a gas supply passage for supplying fuel gas to the hot water supply burner 17 is provided, and the hot water supply through the gas supply passage is provided in the gas supply passage. A gas on-off valve (gas solenoid valve) for controlling the presence or absence of supply to the burner 17 and a gas proportional valve for adjusting the supply amount are provided. In addition, appropriate components (not shown) such as a combustion fan for supplying and exhausting air to and from the hot water supply burner 17 are provided, and the heating control of the hot water supply heat exchanger 29 is controlled by controlling these components. Done.

  A flow rate detection sensor 73 and an incoming water temperature sensor (not shown) are provided in the passage on the inlet side of the hot water supply circuit 162, and the outlet of the hot water heat exchanger 29 is provided in the passage on the outlet side of the hot water heat exchanger 29. The hot water supply heat exchange side temperature detection sensor 114 for detecting the temperature on the side (hot water temperature passing through the outlet side passage) is provided, and further on the downstream side, the temperature of hot water supplied through the hot water supply circuit 162 (hot water supply temperature) ) Is detected. A hot water supply passage 26 is provided on the outlet side of the hot water supply circuit 162, and the flow rate detection sensor 73 detects the flow rate of hot water supplied through the hot water supply passage 26. In addition, the said incoming water temperature sensor detects the hot water temperature introduced into the water heater 116, and can also be abbreviate | omitted depending on the case.

  This heat source device includes a hot water supply function that heats (follows up) hot water introduced into the hot water supply circuit 162 of the hot water supply 116 from the hot water passage 109 side and supplies hot water, and from the hot water passage 109. It has a non-following heating hot water supply function of supplying hot water introduced into the hot water supply circuit 162 to the hot water supply destination through the hot water supply circuit 162 without being heated. The hot water that has passed through the hot water supply circuit 162 of the water heater 116 is either hot water that has passed through the hot water supply circuit 162 while being heated by the follow-up heating hot water supply function, or hot water that has passed through the hot water supply circuit 162 without being heated by the non-following heating hot water supply function. Hot water is supplied to one or more hot water destinations through the hot water supply passage 26.

  Although not shown in the drawing, a hot water tap (including a shower operation lever) is provided at the front end side of the hot water passage 26, and the hot water tap is opened to store in the hot water tank 2. The hot water that has been subjected to the water supply pressure passes through the hot water passage 109 and, as described above, is mixed with the water from the water supply passage 108b as necessary, is heated by the hot water heater 116, or is mixed with water. Hot water is supplied without additional heating.

  This heat source device is provided with a control device (not shown). The control device controls the flow rate of hot water flowing from the hot water passage 109 to the hot water / merging portion 110 side by controlling the tank hot water / water mixer 112. In addition, the mixing flow rate control means for controlling the water mixer 43 to control the flow rate of the water flowing from the water supply passage 108b to the hot water / merging portion 110 side so that the mixed hot / cold water at an appropriate temperature is formed in the hot water / merging portion 110. Is provided.

  This mixing flow rate control means, for example, closes the tank-side solenoid valve 47 when hot water supply is stopped, so that the flow rate of hot water (hot water discharged from the hot water storage tank 2) flowing from the hot water passage 109 to the hot water joining portion 110 becomes zero. To do. When the hot water tap provided at the front end side of the hot water supply passage 26 is opened, the flow of water is detected by the water supply flow rate sensor 129, so that the mixing flow rate control means receives the detection signal and receives the detection signal. 7, the flow rate of hot water flowing from the hot water passage 109 to the hot water merging section 110 side is adjusted by the control of the tank hot water mixer 112 as shown by the arrow B in FIG. As shown by the arrow B ′ in FIG. 7, the flow rate of the water flowing from the water supply passage 108b toward the hot water / merging portion 110 is adjusted, and the temperature of the mixed hot water formed at the hot water / merging portion 110 is, for example, about the same as the hot water supply set temperature. Set to the set mixing temperature.

  Note that the hot water stored in the hot water tank 2 is formed with layers Wa, Wb, and Wc at temperatures as shown in the schematic diagram of FIG. (High temperature layer) Wa stores hot water of high temperature Ta (for example, 80 ° C.) heated by exhaust heat generated during power generation of the power generation device 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. .

  For example, as shown in FIG. 8, in the hot water in the hot water storage tank 2, for example, the boundary between the layer Wa and the layer Wb is below the area where the tank thermistor 35a is disposed, and the detected temperature of the tank thermistor 35a is the hot water supply set temperature. For example, when the temperature is higher than a threshold value set higher by 5 ° C., the temperature of the hot water discharged from the hot water storage tank 2 is a substantially constant value such as 60 ° C. or higher (for example, 80 ° C.).

  Therefore, the mixing flow rate control means is configured to change the tank hot water / water mixer 112 so that the detected temperature of the mixed thermistor 128 becomes the mixed set temperature based on the difference between the detected temperature of the mixed thermistor 128 and the mixed set temperature (according to the deviation). And the water mixer 43 are controlled to adjust the flow rate of hot water flowing from the hot water passage 109 to the hot water merging portion 110 side and the flow rate of water flowing from the water supply passage 108b to the hot water merging portion 110 side. 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 hot water / merging section 110 is set to the mixed set temperature (for example, the same temperature as the hot water set temperature or a temperature close thereto) by the control by the mixing flow rate control means, the mixed hot water As shown by the arrow B ″ in FIG. 7, the hot water is introduced from the hot water / merging section 110 into the hot water heater 116 through the hot water introduction passage 115. At this time, the hot water heater 116 is not heated by the hot water supply heat exchanger 29. In addition, the hot water is supplied to the hot water supply destination through the passage 118 and the hot water supply passage 26 (by the operation of the non-heating hot water supply function).

  In addition, the temperature detected by the tank thermistor 35a becomes equal to or lower than the threshold value during hot water supply, and hot water having a mixed set temperature set to a temperature equivalent to the hot water set temperature cannot be supplied only by the flow rate control by the mixing flow control means. In such a case, appropriate control is performed as to whether the hot water discharged from the hot water tank 2 is additionally heated by the hot water heater 116 or whether the water from the water supply source is heated by the hot water heater 116 without being discharged from the hot water tank 2. To supply hot water at the set temperature. In addition, although detailed description is abbreviate | omitted in this specification, various control is proposed about this control, and it is applied suitably also in this invention.

  Further, in the heat source device, in order to use the hot water in the hot water tank 2 more effectively, the hot water tank 2 is thermally connected to the heating device and the amount of hot water in the hot water tank 2 is used for heating. An example of such a configuration is schematically shown in FIG. In the figure, a hot water tank 2 and a hot water circulation loop passage 131 are thermally connected via a liquid-water heat exchanger 130, and the hot water circulation loop passage 131 is driven by a heating utilization pump 140. The hot water in the hot water storage tank 2 is led out from the upper side of the hot water and passed through the liquid-water heat exchanger 130 and then returned to the hot water storage tank 2 from the lower side of the hot water storage tank 2. The hot water circulation loop passage 131 is thermally connected to the heating liquid circulation circuit 5 via the liquid-water heat exchanger 130, and the heating liquid circulation circuit 5 converts the liquid heating heat medium into the heating device 10. Circulate through.

  In this heat source device, a hot water storage unit 104 including a hot water circulation loop passage 131 and a liquid-water heat exchanger 130 is formed, and the heat of the hot water flowing from the hot water tank 2 through the hot water circulation loop passage 131 is converted into a heating liquid circulation circuit. 5 is transmitted to the heating heat medium flowing through the liquid-water heat exchanger 130, heat is supplied to the heating device 10, and heating using the heating device 10 is possible. In FIG. 6, an auxiliary heat source device such as a water heater 116 having a heating operation function may be thermally connected to the heating device 10.

JP, 2015-75321, A

  By the way, in the heat source device having the hot water storage unit 104 as shown in FIG. 6, when the temperature of hot water returned to the lower side of the hot water tank 2 through the hot water circulation loop passage 131 is high, the hot water temperature in the hot water tank 2 is increased. If it becomes high and it becomes so, the temperature of the water supplied to the electric power generating apparatus 1 from the lower part side of the hot water tank 2 will become high. And if the temperature of the water becomes higher than 50 degreeC, for example, since it will become impossible to operate the electric power generating apparatus 1, the problem that the electric power utilization by the operation | movement of the electric power generating apparatus 1 becomes impossible becomes impossible. Will occur.

  Therefore, in order to prevent such a problem from occurring, it is necessary to reduce the temperature of the hot water returned to the lower side of the hot water tank 2 through the hot water circulation loop passage 131 to an appropriate temperature. It is necessary to transmit a large amount of heat to the heating heat medium flowing through the liquid circulation circuit 5 via the liquid-water heat exchanger 130. However, for that purpose, the liquid-water heat exchanger 130 having a large heat exchange capacity is required. If the liquid-water heat exchanger 130 having a large heat exchange capacity is provided to form the hot water storage unit 104, the cost of the hot water storage unit 104 is increased. And the cost of the heat source device increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to efficiently connect the hot water storage tank heated by the exhaust heat of the power generation device to the heating device, thereby efficiently generating the power generation device. It is an object of the present invention to provide a heat source device with a power generation function that can be operated at a low cost and can reduce the cost of a hot water storage unit having a hot water storage tank.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first invention provides a power generation device, a hot water storage tank, and hot water heated by exhaust heat of the power generation apparatus by supplying cooling water to the power generation apparatus from the lower side of the hot water storage tank. A heat recovery circuit to be introduced into the hot water tank from the upper side, and the hot water of the hot water tank is led out from the upper side of the hot water tank and the hot water is passed through a liquid-water heat exchanger, and then the lower side of the hot water tank A hot water circulation loop passage for returning the hot water from the hot water storage tank to the hot water storage tank, and a heating liquid circulation circuit for circulating a heating medium for heating the liquid through the heating device via the liquid-water heat exchanger. In the hot water circulation loop passage, the hot water tank side return hot water flowing from the outlet side of the liquid-water heat exchanger to the hot water tank side is returned to the hot water tank without returning to the hot water tank. A bypass passage is provided to return to the inlet side of the water heat exchanger, from the hot water storage tank Heat of hot water flowing through the water circulation loop passage is transmitted to the heating heat medium flowing through the heating liquid circulation circuit via the liquid-water heat exchanger, and the heating heat medium is passed through the heating device to perform heating operation. When performing, when the temperature of the hot water tank-side return hot water is equal to or higher than a predetermined bypass-side path switching temperature, the hot water tank-side return hot water is flowed to the bypass passage side without returning to the hot water tank side, and the hot water storage tank When the temperature of the side return hot water is lower than the bypass side path switching temperature, a path switching means for flowing the hot water tank side return hot water in a direction to return to the hot water tank side is provided as means for solving the problem.

  Further, in the second invention, in addition to the configuration of the first invention, a heating heat exchanger heated by burner combustion is provided in the heating liquid circulation circuit, and flows from the hot water tank through the hot water circulation loop passage. When the amount of heat supplied to the heating device is insufficient by only the heat exchange in which the heat of hot water is transferred to the heating heat medium flowing through the heating liquid circulation circuit via the liquid-water heat exchanger, the heating liquid passes through the heating liquid circulation circuit. Auxiliary heating means is provided for heating the liquid by the heating heat exchanger and supplying the liquid to the heating device.

  Furthermore, the third invention is characterized in that, in addition to the configuration of the first or second invention, the power generation device is a fuel cell.

  According to the present invention, cooling water is supplied to the power generation device from the lower side of the hot water storage tank, and hot water heated by the exhaust heat of the power generation device is introduced into the hot water storage tank from the upper side of the hot water storage tank. Since the heat stored in the tank can be used for heating as follows, the operation time of the power generation device can be lengthened. In other words, in the present invention, the hot water circulation loop passage for deriving hot water in the hot water tank from the upper side of the hot water tank, passing the hot water through the liquid-water heat exchanger, and returning the hot water from the lower side of the hot water tank to the hot water tank. The hot water circulation loop passage is thermally connected to a heating liquid circulation circuit for circulating a heating medium for heating the liquid through a heating device via the liquid-water heat exchanger.

  Then, the heat of hot water flowing from the hot water tank through the hot water circulation loop passage is transmitted to the heating heat medium flowing through the heating liquid circulation circuit via the liquid-water heat exchanger and heated, and the heating is performed. By performing the heating operation by passing the heat medium through the heating device (heating operation using hot water storage tank heat), the exhaust heat of the power generation device stored in the hot water storage tank can be used for heating. Therefore, the operation time of the power generation device can be lengthened and energy saving can be achieved.

  In addition, according to the present invention, the heat source device can be reduced in size and cost by the following configuration, and the heat source device capable of efficiently operating the power generation device and using heat can be realized. can do.

  In other words, in the present invention, the hot water circulation loop passage is provided with the hot water storage side return hot water flowing from the outlet side of the liquid-water heat exchanger to the hot water tank side without returning to the hot water tank. A bypass passage is provided so as to return to the entry side of the vessel, and the path switching means, when the hot water tank heat utilization heating operation, when the temperature of the hot water tank side return hot water is equal to or higher than a predetermined bypass side path switching temperature, The hot water stored in the hot water tank is returned to the bypass passage without returning to the hot water tank.

  Therefore, when the temperature of the hot water tank side return hot water is high, the heat of the hot water tank side return hot water is transferred to the heating heat medium via the liquid-water heat exchanger, while the bypass passage and the hot water circulation loop passage are Heat was transferred through the liquid-water heat exchanger by repeating the operation of circulating hot water with a high temperature through part (excluding the part closer to the hot water tank than the connection with the bypass passage) ( The heating device can be heated by the heated heating medium, and the hot water is not sent to the hot water tank as described above, so that the hot water temperature on the lower side of the hot water tank rises. Can be prevented.

  When the temperature of the hot water tank-side return hot water becomes lower than the bypass-side path switching temperature due to the supply of heat to the heating liquid circulation circuit via the liquid-water heat exchanger, the path switching means By flowing the hot water tank-side return hot water in the direction to return to the hot water tank side, the hot water tank-side return hot water having a low temperature can be supplied to the hot water tank side. Therefore, it is not necessary to provide a liquid-water heat exchanger having a large heat exchange capacity that allows heat exchange until the hot water returning to the hot water tank reaches a low temperature, and a heat source device is formed using a small liquid-water heat exchanger. It is possible to realize an excellent heat source device that can be operated at low cost and that can efficiently operate the power generation device for a long time by effectively using the heat stored in the hot water storage tank by using the exhaust heat of the power generation device as described above. .

  In the present invention, a heating heat exchanger heated by burner combustion is provided in the heating liquid circulation circuit, and the heat of hot water flowing from the hot water tank through the hot water circulation loop passage flows through the heating liquid circulation circuit. When the amount of heat supplied to the heating device is insufficient by only the heat exchange transmitted to the heating medium via the liquid-water heat exchanger, the liquid passing through the heating liquid circulation circuit is heated by the heating heat exchanger. By providing the auxiliary heating means to be supplied to the heating device, it is possible to comfortably perform the heating operation by heating the heating device by the auxiliary heating means as required.

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

It is a typical system block diagram which shows a partial structure of one Example of the heat-source apparatus with a power generation function which concerns on this invention. It is a typical system block diagram which shows the structure except the site | part shown in FIG. 1 in the heat source apparatus with an electric power generation function of an Example. It is a typical system block diagram for demonstrating the example of an operation state when the temperature of the hot water storage tank side return hot water in hot water storage tank heat utilization heating operation is high in the heat source apparatus with a power generation function of an Example. It is a block diagram which shows the heating operation control structure of the heat-source apparatus with an electric power generation function of an Example. It is a flowchart which shows the example of control at the time of the heating of the heat source apparatus with an electric power generation function of an Example. It is a schematic diagram for demonstrating the system structural example of the heat-source apparatus with a power generation function considered in order to utilize the heat | fever of a hot water storage tank efficiently. It is explanatory drawing which shows typically the system structural example of the conventional heat source apparatus with a power generation function. It is explanatory drawing which shows typically the temperature distribution example in a hot water storage tank and a hot water storage tank.

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

  1 and 2 schematically show a system configuration of an embodiment of a heat source device with a power generation function according to the present invention. The configuration shown in FIG. 1 and the configuration shown in FIG. The heat source device with a power generation function of the embodiment is formed. The part (N) in FIG. 1 communicates with the part (N) in FIG.

  As shown in these drawings, the heat source device of the present embodiment is connected to a hot water storage unit 104 having the configuration shown in FIG. 1, the power generator 1, and a water heater 116 having the configuration shown in FIG. 2. Is formed. Further, in this embodiment, similarly to the heat source device shown in FIG. 6, a hot water circulation loop passage 131 is connected to the hot water storage tank 2 (see the shaded portion in FIG. 1). The low-temperature heating liquid circulation circuit portion 5 a in the heating liquid circulation circuit 5 is thermally connected through the liquid-water heat exchanger 130.

  In this embodiment, the hot water circulation loop passage 131 is provided with a bypass passage 135, a tank return three-way valve 136, and a tank return temperature thermistor 137. The bypass passage 135 returns the hot water tank side return hot water flowing from the outlet side of the liquid-water heat exchanger 130 to the hot water tank 2 side to the inlet side of the liquid-water heat exchanger 130 without returning to the hot water tank 2. In this embodiment, the bypass passage 135, the tank return three-way valve 136, and the tank return temperature thermistor 137 are used for specific passages as will be described later. The control is performed.

  As shown in FIGS. 1 and 2, in this embodiment, the heating liquid circulation circuit 5 includes a low-temperature heating liquid circulation circuit part 5 a and a high-temperature heating liquid circulation circuit part 5 b outside the water heater 116. And a heating device (low temperature heating device) 10a for supplying a low temperature heating medium to the liquid circulation circuit portion 5a for low temperature heating, and a high temperature heating medium for the liquid circulation circuit portion 5b for high temperature heating. A heating device (high temperature heating device) 10b is connected to each other. In this embodiment, the low-temperature heating device is a hot water mat (heating mat), and the high-temperature heating device is a bathroom dryer.

  Although the liquid circulation circuit part 5b for high temperature heating is not directly connected to the liquid-water heat exchanger 130, the liquid circulation circuit part 5b for high temperature heating and the liquid circulation circuit part 5a for low temperature heating are combined with each other. The heating fluid circulation circuit 5 is formed together with the pipes 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 in the water heater 116. The configuration of the heating liquid circulation circuit 5 in the water heater 116 is not particularly limited and is appropriately set. In this embodiment, the configuration shown in FIG. 2 is applied. 2, dots are marked on the heating liquid circulation circuit 5 in the water heater 116.

  The heating liquid circulation circuit 5 is provided with conduits 40, 41, 44, 45, 59, 68 outside the appliance case 42 of the water heater 116 and outside the hot water storage unit 104. The paths 141, 144, 145, 146, and 147 are provided, and the low-temperature heating liquid circulation circuit portion 5a and the high-temperature heating liquid circulation circuit portion 5b are formed as described above. In the heating liquid circulation circuit 5 including these, A liquid heat medium (here, hot water) is circulated through an appropriate path and supplied to the heating device 10 (10a, 10b) to perform heating.

  The pipe 40 is connected to the pipe 97, the pipes 41 and 44 are connected to the pipe 95 through the liquid merging means 15 and the pipe 59, and the pipe 45 is connected to the pipe 95 through the liquid branching means 39. 90. The pipes 40 and 41 are connected to the internal passage 51 of the heating device 10b, and the heating device 10b is provided with the thermal valve 12. A liquid having a predetermined high-temperature heating set temperature (for example, 80 ° C.) is supplied to the heating device 10b. An internal passage 52 of the heating device 10a is connected to the pipes 44 and 45. In addition to the one shown in the figure, a heating device can be connected to the liquid branching means 39 and the liquid merging means 15 as required.

  The heating liquid circulation circuit 5 includes a liquid circulation pump 6 that circulates liquid (liquid heat medium) in the heating liquid circulation circuit 5 in the appliance case 42 of the water heater 116, and driving of the liquid circulation pump 6. A heating heat exchanger 28 (28a, 28b) for heating the circulating liquid is provided. A pipe 95 is connected to the liquid introduction side of the heating heat exchanger 28a, and a pipe 94 is connected to the liquid outlet side, and a pipe 91 is connected to the liquid introduction side of the heating heat exchanger 28b. Pipe lines 92 are connected to the outlet side. A heating high temperature thermistor 33 is provided in the pipe line 92, and the heating high temperature thermistor 33 detects the temperature of the liquid coming out of the heating heat exchanger 28b.

  The pipe 91 is connected to the discharge side of the liquid circulation pump 6 together with the pipe 90, and the pipe 91 is connected to the heating low temperature for detecting the temperature of the liquid introduced into the heating heat exchanger 28b. A thermistor 36 is provided. Further, the pipe 93 is connected to the suction port side of the liquid circulation pump 6, and a cistern apparatus 100 is provided between the pipe 93 and the pipe 94. The tank capacity of the cistern apparatus 100 is, for example, about 1 to 1.8 liters, and the cistern apparatus 100 is open to the atmosphere via the atmosphere introduction passage 53.

  Heating heat exchangers 28 (28a, 28b) are respectively provided in the combustion chamber 24. In the combustion chamber 24, together with the heating heat exchanger 28, a burner that heats the heating heat exchanger 28 ( A heating burner 16 is provided, and a combustion fan 18 for combustion supply and exhaust is provided on the lower side of the burner 16. Further, the water heater 116 has a hot water supply function, a bath reheating function, and a heating function, and is provided with a combustion chamber 25 in communication with the combustion chamber 24, and a burner (hot water supply burner) is provided in the combustion chamber 25. 17 and a hot water supply heat exchanger 29 (29a, 29b) heated by the burner 17, and a combustion fan 19 for supplying and exhausting combustion of the burner 17 are provided.

  Gas pipes 31 and 32 for supplying fuel to the burners 16 and 17 are connected to the burners 16 and 17. These gas pipes 31 and 32 are branched from the gas pipe 30, and a gas on / off valve 80 is interposed in the gas pipe 30. The gas pipe 31 is provided with a gas proportional valve 86 and gas on-off valves 81 and 82, and the gas pipe 32 is provided with a gas proportional valve 87 and gas on-off valves 83, 84 and 85, respectively. These valves 80 to 87 are all formed by electromagnetic valves, the gas on / off valves 80 to 85 control the fuel supply / stop to the corresponding burners 16 and 17, and the gas proportional valves 86 and 87 correspond to each other. The amount of fuel supplied to the burners 16 and 17 is controlled by the valve opening. The combustion control of the burners 16 and 17 is controlled by an appropriate control method by a combustion control means (not shown).

  A water supply introduction passage 88 is provided on the inlet side of the hot water supply heat exchanger 29a. The water supply introduction passage 88 is connected to the cistern device 100 via the connection passage 57 and the makeup water electromagnetic valve 46 and is connected to the heating liquid circulation circuit 5. On the inlet side of the water supply introduction passage 88, a flow rate sensor 73 for detecting the amount of hot water flowing through the water supply introduction passage 88 and a water entrance temperature sensor 74 for detecting the water entrance temperature are provided. Further, a hot water supply passage 26 is provided on the outlet side of the heat exchanger 29b, and the front end side of the hot water supply passage 26 is led to an appropriate hot water supply destination. The hot water supply passage 26 is connected to the water supply introduction passage 88 through a branch passage 70 and a hot water passage switching valve 58, and the hot water supply passage 26 detects the hot water temperature downstream of the branch portion of the branch passage 70. The sensor 113 is provided, and the hot water supply heat exchange side temperature detection sensor 114 is provided on the heat exchanger 29 side.

  For the reheating function of the bath, a recirculation circulation passage 13 having an outgoing pipe 14 and a return pipe 165 connected to a bathtub (not shown) is provided. Is connected to the heating liquid circulation circuit 5 through a liquid-water heat exchanger 7. A flow rate control valve 38 is provided at the inlet of the liquid-water heat exchanger 7 in the pipe line 89 forming the liquid-water heat exchanger 7 of the heating liquid circulation circuit 5. The recirculation circulation passage 13 is provided with a bathtub hot water circulation pump 20 that circulates bathtub hot water. The liquid-water heat exchanger 7 drives the hot water circulating in the recirculation circulation path 13 by driving the bathtub hot water circulation pump 20. It consists of a heated bath heat exchanger.

  The recirculation circulation passage 13 is supplied with a bath temperature sensor 21 as a bath water temperature detecting means for detecting the temperature of the bathtub hot water, a water level sensor 22 for detecting the water level of the bath water, and the water flow in the recirculation circuit 13. A bath water flow switch 34 to be detected is interposed. One end side of the return pipe 165 is connected to the suction port side of the bathtub hot water circulation pump 20, and the other end side of the return pipe 165 is connected to the bathtub. One end side of the outgoing pipe 14 is connected to the discharge port side of the bathtub hot water circulation pump 20, and the other end side of the outgoing pipe 14 is connected to the bathtub.

  A pouring water unit 55 is connected to the hot water supply passage 26 via a pipe 54 on the downstream side of the formation portion of the branch passage 70 and the arrangement portion of the hot water temperature detection sensor 113. One end side of the bath pouring introduction passage 23 is connected to the pouring water unit 55, and the other end side of the bath pouring introduction passage 23 is connected to the bathtub hot water circulation pump 20. The hot water unit 55 is provided with a hot water solenoid valve 148, a hot water sensor 49, and check valves 50a and 50b. In addition, the hot water supply passage 26 and the pipe 54, the pouring water unit 55, the bath pouring introduction passage 23, the bath hot water circulation pump 20, the liquid-water heat exchanger 7, and the outgoing pipe 14 are sequentially passed from the heat exchanger 29 to the bathtub. The hot water filling passage for performing hot water filling and water pouring is constituted by the passage leading up to. In FIG. 2, reference numeral 48 denotes a capacity switching thermal valve, reference numerals 75 and 77 denote drain discharge passages, and reference numeral 76 denotes a neutralizing means for neutralizing the drain.

  In this heat source device, when performing the heating operation of the heating device 10, the heating operation using the burner combustion heat that performs heating using the amount of combustion heat of the heating burner 16 in the water heater 116, and hot water is stored in the hot water storage tank 2. Any one of hot water storage heating use heating operations for heating using heat is selectively performed. In addition, which operation performs heating will be described later.

  When performing the heating operation using the burner combustion heat, if necessary, the heating heat exchanger 28 is heated by the burner 16 and the liquid circulation pump 6 is driven, whereby the heat medium of the heating liquid circulation circuit 5 is changed to that shown in FIG. Circulate as indicated by arrows A to G. Then, the heat medium introduced into the heating heat exchanger 28a from the pipe 95 and heated by the heating heat exchanger 28a is introduced into the liquid circulation pump 6 through the cistern apparatus 100 and through the pipe 93. .

  In a state where the thermal valve 39 of the liquid branching means 37 is open (during operation of the heating device 10a), the heat medium flows from the discharge side of the liquid circulation pump 6 to the pipe line 90 side and the pipe line 91 side, The heat medium that has flowed to the pipe line 90 side is introduced into the heating device 10a from the pipe line 45 outside the water heater 116 through the pipe line 90, and the low-temperature heating liquid in which the heating device 10a is provided. The water passes through the circulation circuit 5 a and the pipeline 59 in order, returns to the hot water heater 116, and is introduced into the pipeline 95.

  In the low-temperature heating liquid circulation circuit 5a, a heating bypass pipe 141 for returning the heating heat medium to the hot water heater 116 side without passing through the liquid-water heat exchanger 130 in the hot water storage unit 104 is provided. Is provided. 1 and FIG. 2, the path through which the heating heat medium introduced into the pipe 144 in the hot water storage unit 104 flows through the pipe 145 by switching the heating three-way valve 143. It is selectively switched to either a path passing through the liquid-water heat exchanger 130 or a path passing through the heating bypass line 141.

During the heating operation using the burner combustion heat, the path of the heating heat medium introduced into the pipe line 144 in the hot water storage unit 104 after passing through the heating device 10a is a path passing through the heating bypass pipe line 141 (shortcut). ) Through the path passing in the order of arrows K and K ″ K ₀ in FIG. 1 (the path passing through the pipe 145, the liquid-water heat exchanger 130, and the pipe 147 as shown by the arrow K ′ does not pass). To the liquid confluence means 15 through the pipe 68.

  Further, as described above, the heat medium introduced from the discharge side of the liquid circulation pump 6 to the pipe 91 side is introduced into the heating heat exchanger 28b through the pipe 91, and is further heated by the heating heat exchanger 28b. After being heated to a high temperature (for example, about 80 ° C.), the pipe 92 is introduced. And the heat medium which passed through the pipe line 92 flows to the pipe line 97 side and the pipe line 89 side, respectively, in the state where the heat valve 12 of the heating device 10b is open, and the pipe line 89 side (liquid-water). The heat medium flowing to the heat exchanger 7 side passes through the pipe line 96 and returns to the pipe line 95.

  The heat medium that has flowed to the pipe 97 side is introduced into the liquid merging means 15 through the high-temperature heating liquid circulation circuit portion 5b. That is, it is introduced into the heating device 10 b through the conduit 40, passes through the conduit 51 in the heating device 10 b, passes through the conduit 41, and returns to the conduit 95 through the liquid merging means 15.

  When the thermal valves 12 and 39 are closed, the flow of liquid toward the heating device 10 connected to the thermal valves 12 and 39 (to the heating device 10a through the pipes 90 and 45, etc.). And the flow to the heating device 10b through the pipes 97, 40, etc. are stopped.

  In the present embodiment, the water heater 116 receives a bath hot water refilling command from the remote control device connected to the heat source device, drives the bath hot water circulation pump 20, and heats in the heating liquid circulation circuit 5. The medium is circulated while passing through the liquid-water heat exchanger 7, and the bathtub hot water circulation pump 20 is driven to circulate the bathtub hot water in the recirculation circulation path 13. By exchanging heat between the hot water in the bathtub and the liquid passing through the heating liquid circulation circuit 5 via the liquid-water heat exchanger 7, the reheating operation of the hot water in the bathtub can be performed.

  During this reheating operation, the burner 16 is burned so that the temperature of the high temperature heating thermistor 33 becomes a set temperature (for example, 80 ° C.), and the heating is performed until the temperature detected by the bath temperature sensor 21 becomes the bath set temperature. The liquid in the liquid circulation circuit 5 and the bath water in the recirculation circulation passage 13 are circulated. When the temperature detected by the bath temperature sensor 21 reaches the bath set temperature, combustion of the burner 16 is stopped, and the liquid circulation pump 6 and the bathtub hot water circulation pump 20 are stopped after a predetermined post pump time has elapsed.

  Furthermore, when performing hot water filling (automatic hot water filling operation) to the bathtub, the water passing through the heat exchanger 29 is heated by the combustion of the burner 17, and hot water is poured into the bathtub through the hot water filling water passage. Then, after this automatic hot water filling, for example, during the heat retention operation time of 4 hours, the detected temperature of the bath temperature sensor 21 is taken, and the detected temperature exceeds the predetermined allowable range from the preset bath set temperature. When the temperature drops, the reheating operation is performed for 3 minutes, for example, and the operation of the function of the heat retention mode is performed so that the detected temperature of the bath temperature sensor 21 becomes the bath set temperature.

  By the way, the heat source device of the present embodiment uses hot water in the hot water tank that heats the heating device 10a by using the amount of heat stored in the hot water tank 2 in addition to the function of the heating operation using the burner combustion heat as described above. (Use of heat storage) Has the function of heating operation. Note that this hot water tank heat-utilizing heating operation is not performed by the high-temperature heating operation through the high-temperature heating liquid circulation circuit portion 5b (here, the operation of the heating device 10b), and the low-temperature heating operation through the low-temperature heating liquid circulation circuit portion 5a. This is applied only when only (the operation of the heating device 10a here) is performed.

  This hot water tank heat-utilizing heating operation is to perform the heating operation of the heating device 10 using the heat of hot water stored in the hot water tank 2, and in this embodiment, as one of its operation modes, hot water storage As the heating utilization pump 140 in the unit 104 is driven, hot water flows from the upper side of the hot water tank 2 through the hot water circulation loop passage 131 as shown by an arrow J in FIG. The heat is transferred to the heating medium (warm water) flowing through the heating liquid circulation circuit 5 through the exchanger 130 and heated, and the heating medium heated by this heating is passed through the heating apparatus 10a to heat the heating apparatus 10a. The first operation mode is performed. In this first operation mode, the hot water that has passed through the liquid-water heat exchanger 130 is returned to the hot water tank 2.

  Further, in this embodiment, as another operation mode of the hot water tank heat-utilizing heating operation, the hot water passing through the liquid-water heat exchanger 130 is not returned to the hot water tank 2 side, and the liquid-water heat exchange is performed through the bypass passage 135. Returning to the inlet side of the heater 130 and passing through the liquid-water heat exchanger 130 again, the heater 130 is heated by being transferred to the heating heat medium (warm water) flowing through the heating liquid circulation circuit 5 and heated by this heating. It has the 2nd operation mode which passes the heating medium for heating which passed through heating device 10a, and heats heating device 10a.

  Although switching of these operation modes will be described later, the first operation mode is performed when the detected temperature of the tank return temperature thermistor 137 is lower than a predetermined bypass side path switching temperature, and the second operation mode is performed. The mode is performed when the temperature detected by the tank return temperature thermistor 137 is equal to or higher than the bypass side path switching temperature.

  1 or 2, reference numerals 150 and 151 are check valves, 152 to 155 are valves, 161 is a drain electromagnetic valve, 163 is a pressure reducing valve, 156 is a pressure relief valve, 157 is an overflow passage, 158, 159, Reference numeral 160 is a filter, 183 is a drain valve, 184 is a drain passage, and 185 and 186 are thermistors.

  FIG. 4 shows a control configuration for heating operation in the heat source apparatus of the present embodiment. In this embodiment, the controller 60 of the hot water storage unit 104 includes a tank hot / cold water heating / heating control means 61, an auxiliary heat source device communication / communication means 62, a heating three-way valve switching means 63, a pump drive control means 64, and a path switching means 65. The remote control device 66 and the control device 67 of the hot water heater 116 (auxiliary heat source device) are signal-connected.

  The remote control device 66 is installed at an appropriate place in a room such as a living room of a user's house. For example, the user starts or stops the operation of the heating device 10a or the heating device 10b, sets a hot water supply set temperature, or takes a bath. Appropriate operations such as setting the reheating temperature are performed using the operation of the remote control device 66.

  When the operation start of the heating device 10a is performed by operating the remote control device 66, a hot water mat heating start signal is added to the tank hot water use heating operation control means 61 and the control device 67 of the water heater 116, and the control of the water heater 116 is performed. The device 67 drives the hot water circulation pump 6 provided in the water heater 116 at an appropriate timing.

  When the hot water mat heating start signal is applied, the tank hot water heat utilization heating operation control means 61 confirms whether or not the heating device 10b is operating (for example, hot water supply via the auxiliary heat source device communication communication means 62). When the operation of the high-temperature heating device 10b is not performed, the detected temperature of the tank thermistor 35a is taken in and the detected temperature is determined in advance as a heating use reference temperature (for example, 60). When the temperature is equal to or higher than [° C.], the heating operation of the heating device (here, the low-temperature heating device 10a) is performed using the heat of the hot water stored in the hot water tank 2. As described above, when the detected temperature of the tank thermistor 35a is 60 ° C. or higher, hot water of about 80 ° C. is stored in the hot water storage tank 2, for example.

  When the tank hot water heat utilization heating operation control means 61 determines that the heating operation of the heating device 10 is performed using the heat of the hot water stored in the hot water tank 2 (when execution of the hot water tank heat utilization heating operation is determined). The determination signal is applied to the heating three-way valve switching means 63 and the pump drive control means 64. In addition, when the tank hot water heat utilization heating operation control means 61 judges that operation of the heating apparatus 10b is performed, the hot water tank heat utilization heating operation is not performed.

The heating three-way valve switching unit 63 sets the heating three-way valve 143 to the liquid-water heat exchanger 130 side when the determination signal for the hot water tank heat use heating operation is applied from the tank hot / cold water use heating operation control unit 61. Then, by driving the liquid circulation pump 6 (see FIG. 2) in the water heater 116, the liquid heat medium (hot water here) passes through the heating liquid circulation circuit portion 5a, and the arrows K, K ′, It flows in the order indicated by K ₀ (in the hot water storage unit 104, the pipes 144 and 145, the liquid-water heat exchanger 130, and the pipes 146 and 147 pass in this order).

On the other hand, the pump drive control means 64 will drive the heating utilization pump 140, if the determination signal of hot water tank heat utilization heating operation is added from the tank hot-water heat utilization heating operation control means 61. FIG. Then, from the upper side of the hot water tank 2, as shown by an arrow J in FIG. 1, hot water having a temperature equal to or higher than the heating use reference temperature flows through the hot water circulation loop passage 131, and the heat of the hot water is circulated in the heating liquid circulation. 1 is transmitted to the heating medium (warm water) flowing in the order of arrows K, K ′, and K _{0 in} FIG. 1 through the circuit 5 through the liquid-water heat exchanger 130 to heat and warm the heating medium. The heating medium is passed through the heating device 10a to perform the heating operation (heating operation using hot water from the hot water tank).

  The path switching means 65 takes in the temperature of the hot water tank-side return hot water detected by the tank return temperature thermistor 137 during the heating operation using hot water from the hot water tank, and this temperature is determined in advance by a bypass-side path switching temperature (for example, 40 ° C.). ) At the above time, the hot water tank side return hot water is not returned to the hot water tank 2 side, but flows to the bypass passage 135 side (the tank return three-way valve 136 is switched to the bypass passage 135 side). When the temperature is lower than the bypass side path switching temperature, the hot water tank side return hot water is caused to flow in a direction to return to the hot water tank 2 side (the tank return three-way valve 136 is switched to the hot water tank 2 side).

  That is, by the control of the path switching means 65, the temperature of the hot water tank side return hot water detected by the tank return temperature thermistor 137 during the heating operation using the hot water of the hot water tank is changed to the bypass side path switching temperature ( For example, when the temperature is higher than 40 ° C., the hot water stored in the hot water tank is returned to the bypass passage 135 without returning to the hot water tank 2 (the tank return three-way valve 136 is switched to the bypass passage 135). (See also the shaded area in FIG. 3). Further, when the temperature of the hot water tank side return hot water is lower than the bypass side path switching temperature or when the temperature falls below the bypass side path switching temperature, control (switching the tank return three-way valve 136 to the hot water tank 2 side) is appropriately performed. The hot water tank side return hot water is made to flow in a direction to return to the hot water tank 2 side (flow along the path of arrow J in FIG. 1).

  For example, when the temperature of hot water in the hot water tank 2 is 80 ° C., the hot water is introduced into the liquid-water heat exchanger 130 through the hot water circulation loop passage 131 and passes through the liquid-water heat exchanger 130. By transferring heat to the heat medium (here, hot water) passing through the heating liquid circulation circuit portion 5a of the heating liquid circulation circuit 5, the hot water temperature after passing through the liquid-water heat exchanger 130 is about 73 ° C. Suppose that Then, the detected temperature of the tank return temperature thermistor 137 becomes, for example, about 73 ° C., which is higher than the bypass side path switching temperature (for example, 40 ° C.), and at this time, the path switching means 65 connects the tank return three-way valve 136 to the bypass path 135 side. The hot water at about 73 ° C. is not returned to the hot water tank 2.

  Then, hot water of about 73 ° C. is circulated through the bypass passage 135 and introduced into the liquid-water heat exchanger 130 as shown in FIG. 3, and the heating-liquid circulation is performed through the liquid-water heat exchanger 130. By transferring heat to the heat medium passing through the heating liquid circulation circuit portion 5a of the circuit 5, the hot water temperature after passing through the liquid-water heat exchanger 130 becomes, for example, about 66 ° C. Then, since the detection temperature of the tank return temperature thermistor 137 is about 66 ° C. and is equal to or higher than the bypass side path switching temperature (for example, 40 ° C.), the tank return three-way valve 136 remains on the bypass passage 135 side. The hot water of 0 ° C. is circulated without returning to the hot water storage tank 2, and hot water of about 66 ° C. is introduced into the liquid-water heat exchanger 130.

  Further, hot water of about 66 ° C. is introduced into the liquid-water heat exchanger 130, and heat is passed through the liquid-water heat exchanger 130 to the heat medium passing through the heating liquid circulation circuit portion 5 a of the heating liquid circulation circuit 5. By transmitting, the hot water temperature after passing through the liquid-water heat exchanger 130 becomes, for example, about 60 ° C. Here, since the detection temperature of the tank return temperature thermistor 137 is about 60 ° C. and is equal to or higher than the bypass side path switching temperature (for example, 40 ° C.), the tank return three-way valve 136 is left on the bypass passage 135 side and about 60 ° C. Although the hot water of 0 ° C. circulates without returning to the hot water storage tank 2, when the detected temperature of the tank return temperature thermistor 137 reaches about 60 ° C., in this embodiment, the path switching means 65 is replaced by the pump drive control means 65. Is added to lower the rotation speed of the heating-use pump 140.

  Then, a part of the bypass passage 135 and the hot water circulation loop passage 131 (path closer to the hot water storage tank 2 than the connection portion with the bypass passage 135 and from the connection portion with the bypass passage 135 to the connection portion with the hot water tank 2. 3), the flow rate of hot water (circulating hot water that does not return to the hot water storage tank 2 and does not lead to hot water from the hot water storage tank 2) is reduced.

  Then, about 60 ° C. hot water is introduced into the liquid-water heat exchanger 130, and about 60 ° C. hot water passes slowly through the liquid-water heat exchanger 130, and the heat of the hot water is heated in the heating liquid circulation circuit 5. The temperature of the hot water discharged from the liquid-water heat exchanger 130 is less than 40 ° C. by being slowly transmitted to the heat medium passing through the liquid circulation circuit portion 5a. At this timing, the detected temperature of the tank return temperature thermistor 137 becomes lower than 40 ° C., which is the bypass side path switching temperature (below 40 ° C.), so the path switching means 65 sets the tank return three-way valve 136 to the hot water tank 2. Switch to the side. Then, hot water having a temperature lower than 40 ° C. flows to the lower side of the hot water tank 2.

  If it does in this way, since the hot water of the temperature below 40 degreeC which flows into the hot water tank 2 side will be slowly introduce | transduced into the hot water tank 2, the temperature stratification of the hot water tank 2 will not collapse. In addition, at the same time as hot water is introduced into the hot water tank 2 in this way, 80 ° C. hot water flows again from the upper side of the hot water tank 2 to the liquid-water heat exchanger 130 side (see arrow J in FIG. 1). ), The above operation is repeated. Then, it is detected at the detection temperature of the tank return temperature thermistor 137 that the outlet temperature of the liquid-water heat exchanger 130 has changed from a temperature below 40 ° C. to about 73 ° C. Thus, the operation of switching the bypass valve 135 to the bypass passage 135 side is performed.

  However, if the flow rate of hot water passing through the hot water circulation loop passage 131 at that time is large (that is, if it flows all at once), hot water is stored in the hot water storage tank due to the delay time from the switching command of the bypass valve 135 to the switching execution. 2 may flow to the lower side.

  On the other hand, as described above, when the temperature reaches 60 ° C. at the inlet of the liquid-water heat exchanger 130, the bypass valve is set in a state where the number of revolutions of the heating pump 140 is reduced and the hot water flow rate through the hot water circulation loop passage 131 is reduced. If 135 is switched, since the flow rate through the hot water circulation loop passage 131 is small, the switching timing of the bypass valve 35 can be made appropriate, and hot water can be prevented from flowing to the lower side of the hot water tank.

  In the present embodiment, the above-described control does not return the hot water tank side return hot water having a high temperature to the hot water tank 2, and the liquid-water heat exchanger 130 converts the heat of the hot water tank side return hot water having a high temperature. Thus, the operation of circulating hot water through the hot water circulation loop passage 131 can be repeatedly performed while being transmitted to the heating heat medium (hot water in the present embodiment) passing through the heating liquid circulation circuit 5a. It can be performed. And when the temperature of the hot water tank side return hot water becomes lower than the bypass side path switching temperature, the temperature of the hot water tank 2 is low by flowing the hot water tank side return hot water back to the hot water tank 2 side. Hot water can be supplied from the hot water tank side.

  The tank hot water / heat utilization heating operation control means 61 detects the tank thermistor 35a when the detected temperature of the tank thermistor 35a is lower than the heating utilization reference temperature or when the temperature is higher than the heating utilization reference temperature and lower than the heating utilization reference temperature. A signal indicating that the temperature is lower than the heating use reference temperature and the hot water storage tank heat utilization heating operation is not performed (no hot water tank heat utilization heating operation is performed) is applied to the auxiliary heat source device communication communication means 62 and the heating three-way valve switching means 65. .

The heating three-way valve switching means 63 switches the heating three-way valve 143 to the heating path bypass passage 141 side when a signal indicating that the hot water tank heat utilization heating operation is not applied is supplied from the tank hot water heat utilization heating operation control means 61. The liquid (hot water) flowing through the circulation circuit 5 is caused to flow through the heating path bypass passage 141 in the order of arrows K, K ″, K ₀ .

  When the auxiliary heat source device communication communication means 62 receives a signal indicating that there is no hot water tank heat utilization heating operation from the tank hot water heat utilization heating operation control means 61, the auxiliary heat source apparatus communication communication means 62 supplies this signal via the remote control device 66 (or directly). To the control device 67 of the device 116.

  When the heating start signal is applied to the controller 67 of the water heater 116, the controller 67 of the water heater 116 drives the liquid circulation pump 6 in the water heater 116 as described above. In addition to this, the auxiliary heat source device communication communication means. When a signal indicating no hot water tank heating operation is added from 62, combustion of the heating burner 16 is controlled by a combustion control means (not shown), and the heating liquid circulation circuit 5 is passed through as described above. The heat medium is heated, and heating operation (heating operation using burner combustion heat) is performed by the heat.

  In this way, the water heater 116 transmits the heat of hot water flowing from the hot water tank 2 through the hot water circulation loop passage 131 to the heating heat medium flowing through the heating liquid circulation circuit 5 via the liquid-water heat exchanger 130. When the amount of heat supplied to the heating device 10a is insufficient by only heat exchange, the control unit 67 controls the heating medium passing through the heating liquid circulation circuit 5 to be heated by the heating heat exchanger and supplied to the heating device 10a. It also functions as a heating means.

  In the present embodiment, with the above-described configuration, the heating device 10a can be heated by effectively using the exhaust heat of the power generation device 1, and the liquid-water heat exchanger 130 used for the heat exchange can be reduced in size. Therefore, it is possible to provide a small-sized and low-cost heat source device that can perform comfortable heating. And it is possible to effectively use the exhaust heat of the power generation device 1 for heating, and in particular, an excellent heat source device with high energy saving efficiency that can generate a lot of electric power that is in demand in winter by operating the power generation device 1 for a long time. Can be realized. In addition, in the present embodiment, when the exhaust heat of the power generation apparatus 1 cannot be sufficiently heated, the heating by the water heater 116 can be performed, and the heat source used for the heating can be changed as needed to be comfortable. Heating is possible.

  FIG. 5 is a flowchart showing an operation flow for such a heating operation. As shown in the figure, when the heating operation is turned on by operating the remote control device 66 in step S1, the liquid circulation pump 6 in the water heater 116 is driven in step S2 (the heating pump is turned on). In step S3, it is determined whether or not there is heat storage in the hot water tank 2. This determination is made based on, for example, whether or not the detected temperature of the tank thermistor 35a is 60 ° C. or higher. If it is determined that there is heat storage in the hot water tank 2 when the temperature is 60 ° C. or higher, the process proceeds to step S4. Sometimes it is determined that there is no heat storage in the hot water tank 2, and the process proceeds to step S12. The operation in step S12 will be described later.

  When it progresses to step S4, the heat storage utilization heating operation (The hot water storage tank heat utilization heating operation using the heat of the hot water stored in the hot water tank 2) is started. That is, the heat storage use pump (heating use pump 140) is turned on, and the heating switching valve (heating three-way valve 143) is set to the liquid-water heat exchanger 130 side (that is, the heat storage use side of the hot water tank 2). ), The tank return three-way valve 136 is set to the hot water tank 2 (tank) side, and the hot water tank heat utilization heating operation is performed. Thereafter, at any time, in step S5, it is determined whether there is heat storage in the hot water tank 2, and when it is determined that the detected temperature of the tank thermistor 35a is less than 60 ° C. and there is no heat storage in the hot water tank 2. Proceed to step S12. On the other hand, when it is determined in step S5 whether or not there is heat storage in the hot water tank 2, if it is determined that the detected temperature of the tank thermistor 35a is 60 ° C. or higher and there is heat storage in the hot water tank 2, step S6. Proceed to

  In step S6, it is determined whether or not the detected temperature of the tank return temperature thermistor 137 (thermistor TH) is 40 ° C. or higher. If it is 40 ° C. or higher, the tank return three-way valve 136 is connected to the bypass passage 135 side by the path switching means 65 in step S7. It is said. In this state, in step S8, it is determined whether or not the detected temperature of the tank return temperature thermistor 137 is 40 ° C. or higher. If the temperature is 40 ° C. or higher, the temperature is kept below 40 ° C. The tank return three-way valve 136 is on the hot water tank 2 side. By such an operation, as described above, the hot water path circulating in the hot water circulation loop path 131 is appropriately switched based on the temperature of the tank return temperature thermistor 137.

  In step S10, when the heating return temperature (detected temperature of the tank return temperature thermistor 137) becomes higher than the tank upper temperature (detected temperature of the tank thermistor 35a) (for example, hot water in the hot water tank 2 is replaced by hot water supply). If it has been used up), in step S11, the heat storage use heating operation is stopped, the heating use pump 140 is turned off, and the process proceeds to step S12.

  In step S12, heating using the combustion heat of the heating burner of the water heater 116 (burner combustion heat utilization heating operation) is performed. That is, the heating combustion operation is started in the water heater 116, and the heating operation is continued. At this time, the heating switching valve (heating three-way valve) 143 is set to the combustion heat utilization side. When the heating operation is turned off by the remote control device 66 in step S13, the heating operation is turned off in step S14, the combustion of the heating burner 16 is stopped, and the hot water circulation pump 6 (heating pump) is also turned on. The heating switching valve 143 is left on the combustion heat utilization side.

  In addition, this invention is not limited to the said Example, It sets suitably. For example, the details of the system configuration of the heat source device of the present invention are not necessarily limited to the configurations shown in FIGS. 1 to 3 and are set as appropriate. For example, the liquid heat medium circulating in the heating liquid circulation circuit 5 is not necessarily hot water, but may be formed of other liquids such as antifreeze liquid.

  Moreover, the system configuration on the hot water supply side is not limited to the configuration shown in FIGS.

  Furthermore, in the said Example, when the detection temperature of the tank thermistor 35a is less than the said heating utilization reference temperature, or when it becomes less than the heating utilization reference temperature from the heating utilization reference temperature, it does not perform hot water tank heat utilization heating operation, The operation is switched to the operation of heating the hot water passing through the heating liquid circulation circuit 5a by burner combustion on the water heater 116 side. For example, the detected temperature of the tank thermistor 35a is taken in, and the detected temperature is the heating utilization reference temperature (for example, 60 If the temperature difference between the temperature and the heating utilization reference temperature is within a predetermined allowable range (for example, 10 ° C. or less) (for example, the detected temperature of the tank thermistor 35a is 55 ° C.) ), The amount of hot water sent from the hot water tank 2 to the liquid-water heat exchanger 130 side is not enough to supply hot water while performing the hot water heating operation. It may be compensated by the burner combustion of 116 side.

In this case, the heating three-way valve 143 is not switched to the heating path bypass passage 141 side, but the liquid (hot water) flowing through the heating liquid circulation circuit 5 flows in the order of arrows K and K′K _{0 in} FIG. The heat medium (for example, hot water) heated by the liquid-water heat exchanger 130 and returned to the water heater 116 is further heated by the heating heat exchanger 28 in the water heater 116 and supplied to the heating device 10a.

  Furthermore, in the said Example, when the driving | operation of the heating apparatus (high temperature heating apparatus) 10b and the driving | operation of the heating apparatus (low temperature heating apparatus) 10a were performed simultaneously, it was made not to perform hot water storage tank heat utilization heating operation. For example, a configuration in which the amount of heat supplied to the heating device 10a from the hot water heater 116 side during the operation of the heating device 10b can be reduced, or a configuration in which the amount of heat is not supplied from the hot water heater 116 side to the heating device 10a. In the case where the operation of the heating device 10b and the operation of the heating device 10a are performed at the same time, the heating operation using the hot water in the hot water tank of the heating device 10a may be appropriately performed.

  Also in this case, all of the amount of heat supplied to the heating device 10a may be obtained by the heating operation using hot water storage tank heat, or a part of the amount of heat supplied to the heating device 10a is obtained by the heating operation using hot water storage tank heat and insufficient. You may make it supply a part from the water heater 116 side.

  Further, in the above-described embodiment, when the temperature detected by the tank return temperature thermistor 137 reaches about 60 ° C., the rotation speed of the heating pump 140 is decreased. However, such control may not be performed. However, it is preferable to perform such control because the effect as in the above-described embodiment can be obtained.

  Further, the heating device 10 heated by the heat source device of the present invention is not particularly limited and is appropriately set, and supplies a low-temperature liquid heat medium like a heating mat such as a hot water mat. A device for heating (for example, a hot water room heater) is connected to the low-temperature heating liquid circulation circuit portion 5a and thermally connected to the hot water circulation loop passage 131.

  Furthermore, in the heating liquid circulation circuit 5a, the heating three-way valve 143 and the heating bypass line 141 can be omitted. However, in that case, since the liquid passing through the heating liquid circulation circuit 5a always circulates through the liquid-water heat exchanger 130, when the heat storage in the hot water tank 2 cannot be used, the liquid-water heat exchanger 130 is used. If it passes, heat will be dissipated wastefully. Therefore, it is preferable to provide the heating three-way valve 143, the heating three-way valve 46 for controlling the same, and the heating bypass pipe 141 as in the above embodiment.

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

  Since the heat source device with a power generation function of the present invention can be a low-cost heat source device that can efficiently generate power and use heat, it can be used as a heat source device for home use, for example.

DESCRIPTION OF SYMBOLS 1 Power generator 2 Hot water storage tank 3 Heat recovery passage 5 Heating liquid circulation circuit 5a Low temperature heating liquid circulation circuit part 5b High temperature heating liquid circulation circuit part 10, 10a, 10b Heating apparatus 35 Tank thermistor 60 Controller 61 Tank hot water heat Heating operation control means 62 Auxiliary heat source device communication means 63 Heating three-way valve switching means 64 Pump drive control means 65 Path switching means 66 Remote control device 104 Hot water storage unit 116 Hot water heater 130 Liquid-water heat exchanger 131 Hot water circulation loop passage 135 Bypass Passage 136 Tank return three-way valve 137 Tank return temperature thermistor 140 Heating pump

Claims (3)

  A power generator, a hot water tank, and cooling water is supplied to the power generator from the lower side of the hot water tank, and hot water heated by the exhaust heat of the power generator is introduced into the hot water tank from the upper side of the hot water tank. A circuit for recovering heat, and hot water circulation for returning hot water in the hot water tank from the upper side of the hot water tank and returning the hot water to the hot water tank from the lower side of the hot water tank after passing the hot water through a liquid-water heat exchanger And a heating liquid circulation circuit that circulates a heating medium for liquid heating through the heating device and is thermally connected to the hot water circulation loop passage through the liquid-water heat exchanger. In the hot water circulation loop passage, the hot water tank-side return hot water flowing from the outlet side of the liquid-water heat exchanger to the hot water tank side is not returned to the hot water tank, but is returned to the inlet side of the liquid-water heat exchanger. A bypass passage is provided to return the water from the hot water tank through the hot water circulation loop passage. When the flowing hot water is transmitted to the heating heat medium flowing through the heating liquid circulation circuit via the liquid-water heat exchanger and the heating heat medium is passed through the heating device to perform the heating operation, When the temperature of the hot water tank side return hot water is equal to or higher than a predetermined bypass side path switching temperature, the hot water tank side return hot water is not returned to the hot water tank side but flows to the bypass passage side, and the hot water tank side return hot water is returned. A heat source device with a power generation function, characterized in that path switching means is provided for flowing the hot water tank side return hot water back to the hot water tank side when the temperature is lower than the bypass side path switching temperature.   A heating heat exchanger heated by burner combustion is provided in the heating liquid circulation circuit, and the heat of hot water flowing from the hot water tank through the hot water circulation loop passage is transferred to the heating heat medium flowing through the heating liquid circulation circuit. -When the amount of heat supplied to the heating device is insufficient only by heat exchange transmitted through the water heat exchanger, the liquid passing through the heating liquid circulation circuit is heated by the heating heat exchanger and supplied to the heating device. The heat source device with a power generation function according to claim 1, further comprising auxiliary heating means.   3. The heat source device with a power generation function according to claim 1, wherein the power generation device is a fuel cell.

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