JP2008082633A - Hot water supply device and plate type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a service side heat exchanger having a plurality of heat output functions in a single unit with secondary side flow paths arranged in parallel to a single primary side flow path, resulting in equipment being smaller, lighter and highly efficient. <P>SOLUTION: This hot water supply device comprises a hot water supply heat exchanger 23 wherein a hot water supply circuit 2 is formed as the primary side flow path for circulating hot water, and the secondary side flow paths for the service side heat exchangers having the plurality of heat output functions are connected in parallel to the hot water supply circuit 2. Thus, hot water flowing in the primary side flow path for the service side heat exchangers has almost the same temperature to improve the efficiency of heat exchange with the secondary side flow paths. The service side heat exchanger 24 is formed as such a plate type heat exchanger in a single unit that a partition is provided on a heat transfer plate forming the secondary side flow paths, e.g., to partition the secondary side flow paths into rooms depending on the plurality of heat output functions, resulting in equipment being smaller and lighter. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus provided with a hot water supply heat exchanger that is heated by combustion heat of a combustion burner, and in particular, circulates hot water as a primary side heated by the hot water heat exchanger by a circulation pump. In a configuration in which a use side heat exchanger for supplying heat to the secondary side flow path is provided in the hot water supply circulation circuit, when a plurality of heat output functions of the use side heat exchanger are provided, a single primary side is provided. A hot water supply apparatus for connecting a plurality of secondary-side flow paths of the use-side heat exchanger in parallel to the hot-water supply circulation circuit, and forming a function as a plurality of use-side heat exchangers as a single unit; The present invention relates to a plate heat exchanger used for a use side heat exchanger.

  Conventionally, as this type of hot water supply device, as in Patent Document 1, a hot water supply composite device such as a hot water supply and heating bath device is assumed, and a pressure-resistant circulation pump as hot water transfer means is provided in a first circulation circuit for circulating hot water. The first double-tube heat exchanger as a forced convection heat exchanger for heating is installed upstream, and the second double-tube heat exchange as a forced convection heat exchanger for bathing A vessel is provided on the downstream side.

Accordingly, since the path of the first circulation circuit can be shortened, the pressure-resistant circulation pump can be reduced in size, and the first and second double pipe heat exchangers can also be reduced in size, so that the apparatus can be greatly reduced. Moreover, when circulating hot water, the effect that heat loss can be suppressed and low running cost can be realized is described. In addition, as a forced convection type heat exchanger, the double-pipe heat exchanger described in Patent Document 1, the plate type heat exchanger described in Patent Document 2, and the like are conceivable.
JP 2005-164236 A Japanese Patent Laid-Open No. 2000-258085

  However, the conventional hot water supply apparatus has to be provided with one forced convection heat exchanger for heating and for bathing. In addition, a forced convection heat exchanger for heating is provided on the upstream side in series with the first circulation circuit, and a forced convection heat exchanger for replenishing the bath is provided on the downstream side. When reheating operation is performed at the same time, if a large amount of heat is absorbed in the secondary side by the upstream forced convection heat exchanger, the primary side in the downstream forced air convection heat exchanger There was a problem that sufficient heat output could not be secured in the forced convection heat exchanger for chasing the bath, because hot water of sufficiently high temperature could not be supplied to the side.

  In view of the problems of the prior art, the problem to be solved by the present invention is to ensure sufficient heat output in the forced convection heat exchanger for bathing, simplifying the main body configuration, and reducing the size of the appliance An object of the present invention is to provide a hot water supply device that realizes weight reduction of appliances, further reduces heat dissipation loss, and realizes low running cost.

  In order to solve the above-described problems, a hot water supply apparatus of the present invention includes a hot water supply heat exchanger that heats water supplied from a water supply channel, and hot water as a primary side heated by the hot water supply heat exchanger. In a hot water supply circuit that circulates the water by a circulation pump, and a use side heat exchanger for supplying heat to the secondary side flow path is provided, and a plurality of heat output functions of the use side heat exchanger are provided. In this case, a plurality of use side heat exchangers are connected in parallel to a plurality of secondary side flow paths of the use side heat exchangers to the single hot water supply circulation circuit through which the high temperature side hot water that is the primary side flows. Are formed as a single unit.

  The plate heat exchanger of the present invention is a plate heat exchanger in which the use side heat exchanger is formed as a single unit, and the heat transfer plate forming the plurality of secondary side flow paths has a plurality of heat transfer plates. This can be realized by providing a partition for isolation in each room forming the secondary flow path according to the output function.

  This eliminates the need to provide separate forced convection heat exchangers for heating and bathing as in conventional hot water supply devices, simplifying the main body configuration, reducing the size of the appliance, and reducing the weight of the appliance Can be realized.

  The hot water supply apparatus of the present invention realizes downsizing and weight reduction of the appliance by simplifying the main body configuration, reducing heat dissipation loss in the use side heat exchanger, and improving heat exchange efficiency with the secondary side flow path. Can be planned.

  The plate heat exchanger of the present invention can reduce heat dissipation loss and improve the efficiency of heat exchange with the secondary side flow path, simplify the main body configuration, reduce the size of the instrument, reduce the weight of the instrument, and reduce it. Running costs can be reduced.

  1st invention is equipped with the heat exchanger for hot water supply which heats the water supplied from a water supply channel, and supplies hot water to a hot water supply channel, and reaches from a heat exchanger for hot water supply to a utilization side heat exchanger via a circulation pump Forming a hot water supply circulation circuit, forming a hot water supply circuit branching from the hot water supply circulation circuit to a hot water supply path, using either the hot water supply circulation circuit or the hot water supply circuit, or the hot water supply circulation circuit and the When it is possible to select whether to use the hot water supply circuit at the same time, and when providing a plurality of heat output functions of the use side heat exchanger, the single high temperature side hot water supplied from the hot water heat exchanger flows through the single A plurality of secondary side flow paths of the use side heat exchanger are connected in parallel to the hot water supply circulation circuit, and the use side heat exchanger having a plurality of heat output functions is formed as a single unit. , For simplified body configuration Miniaturization of Ri instruments, as well as lighter, to reduce the heat radiation loss in the use side heat exchanger, we are possible to improve the heat exchange efficiency of the secondary circuit.

  The second invention is characterized in that, in particular, the branch portion from the hot water supply circulation circuit of the hot water outlet of the first invention is arranged upstream of the use side heat exchanger, and the branch portion is heat exchange for hot water supply. When the hot water supply circuit is used alone, it is possible to reduce the flow pressure pressure loss of the hot water supply passage and to supply hot water to the hot water supply passage quickly by arranging the hot water supply circuit immediately downstream of the apparatus.

  The third invention is characterized in that, in particular, the branch part from the hot water supply circulation circuit of the hot water outlet of the first invention is arranged on the downstream side of the use side heat exchanger, and the branch part is used on the use side heat exchange. When the hot water supply circuit and the hot water supply circulation circuit are used at the same time by arranging them at the downstream side of the heater, a larger flow rate can be supplied by the hot water supply circulation circuit than in the second aspect of the invention. More heat can be supplied.

4th invention is the utilization side heat exchanger of any one of 1st-3rd invention especially, and a secondary side flow path is formed as a bath circuit connected to a bathtub among several heat output functions. Used as a heat exchanger for baths, and constitutes a circuit system that realizes bath hot water operation that supplies a predetermined amount of hot water at a predetermined temperature to a bathtub from a pouring channel that branches off from a hot water supply path and is connected to the bath circuit A bath thermistor is provided in the bath circuit to detect the temperature of the hot water supplied to the bathtub through the bath heat exchanger, and the bath water temperature is set to a predetermined temperature during the bath hot water operation. Control means for performing operation control for determining the temperature of the hot water to be supplied to the pouring flow path for the hot water supplied to the bathtub as one is supplied to the bath as it is, After the hot water supplied from the passage passes through the bath heat exchanger, The control means calculates the control temperature of hot water to be supplied to the pouring channel so that the temperature of the bath water is a predetermined temperature. be able to.

  5th invention is the utilization side heat exchanger of any one of 1st-3rd invention especially, and a secondary side flow path is formed as a bath circuit connected to a bathtub among several heat output functions. Used as a heat exchanger for baths, and constitutes a circuit system that realizes bath hot water operation that supplies a predetermined amount of hot water at a predetermined temperature to a bathtub from a pouring channel that branches off from a hot water supply path and is connected to the bath circuit A bath opening / closing means is provided in the bath circuit, and the control means closes the channel opening / closing means and does not pass through the bath heat exchanger and is supplied from the pouring channel during the bath hot water operation. The hot water used has a function of pouring into the bathtub as it is from one direction, and the control means is configured to prevent the bath heat exchanger from passing during the pouring operation. The temperature of the hot water flowing through the hot water flow path is the same as the predetermined bath water temperature. It can Note the hot water hot water temperature control can be performed accurately.

  6th invention is the utilization side heat exchanger of any one of 1st-3rd invention especially, and a secondary side flow path is formed as a bath circuit connected to a bathtub among several heat output functions. Used as a heat exchanger for baths, and constitutes a circuit system that realizes bath hot water operation that supplies a predetermined amount of hot water at a predetermined temperature to a bathtub from a pouring channel that branches off from a hot water supply path and is connected to the bath circuit A bath bypass flow path for bypassing the bath heat exchanger in the bath circuit, and a bath circuit flow for switching the flow path between passing through the bath heat exchanger or passing through the bath bypass flow path The bath switching flow is provided, and during the bath hot water operation, the control means drives the bath circuit flow path switching means, and one of the bath bypass flows in which the hot water supplied from the pouring flow path is switched. Pass the road to the bathtub, the other is the pouring channel The supplied hot water has a function of pouring hot water into the bathtub as it is from two directions. As in the fifth aspect, the control means keeps the temperature of the hot water flowing through the hot water flow path as it is. In addition to being able to achieve a predetermined bath water temperature and accurately performing the pouring hot water temperature control, since the pouring operation is performed from two directions, the time required for the bath hot water operation operation can be shortened compared to the fifth invention. .

  A seventh aspect of the present invention is a use-side heat exchanger that is a single unit having a plurality of heat output functions, and includes a plate-type heat configured by alternately laminating primary side flow paths and secondary side flow paths. Using the exchanger, the heat transfer plate forming the secondary side flow path is characterized by forming a partition for isolating each secondary side flow path according to a plurality of heat output functions, Use side heat exchanger as a single unit in which a plurality of secondary flow paths are connected in parallel to a single primary flow path by providing a partition on the heat transfer plate forming the secondary flow path Can be realized as a single plate heat exchanger in a shape that has high heat exchange efficiency and is miniaturized.

  The eighth aspect of the invention relates to the partition of the seventh aspect of the invention, in particular, when each of the secondary side flows according to the purpose of the heat output function when high temperature side hot water having a predetermined temperature and a predetermined flow rate flows into the primary side flow path. It is characterized in that it is formed in a place where the heat transfer area is optimized so that the rated heat output obtained by the road can be obtained, and by specifying and defining the heat transfer area, multiple secondary side flows When heat exchange is performed at the same time in the channel, the amount of heat supplied from the primary side is not biased to one of the secondary side channels depending on the temperature and flow rate conditions of the fluid flowing through each secondary channel. be able to.

  In the ninth aspect of the invention, the plate-type heat exchanger described in the seventh or eighth invention is used in the utilization side heat exchanger described in any one of the first to sixth inventions. As a hot water supply device, it is possible to simplify the main body configuration, downsize the appliance, and reduce the weight of the appliance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows a block diagram of a hot water supply apparatus in each of the first, third, fourth, fifth and sixth embodiments of the present invention.

  In FIG. 1, the water supplied from the water supply path 1 is heated by the combustion of the combustion burner 34, raised to a predetermined temperature, then supplied to the hot water supply path 3, and the water supply path 1 and the hot water supply path 3 communicate with each other. A hot water supply circuit that adjusts to a desired temperature of hot water by supplying a part of the water supplied from the water supply path 1 from the bypass passage 4 formed through the above-described configuration through the bypass control valve 9 and discharges the hot water from the hot water tap 13 is configured. ing.

  When the hot water tap 13 is opened and the incoming water flow rate sensor 5 detects an incoming water flow rate equal to or higher than a predetermined flow rate (for example, 2.8 L / min), the combustion burner 34 has the fuel gas main valve 32 and the fuel gas proportional control valve 27. The fuel gas is supplied from the fuel gas supply path 21 in which is disposed, the combustion air is supplied by the combustion fan 31, and the combustion operation is performed according to a predetermined sequence.

  Here, as the incoming water flow rate sensor 5, for example, a structure of a flow rate sensor that detects an actual flow rate with an output pulse according to the rotation speed of an impeller provided in the flow path according to the flow rate of water flow. Conceivable. The combustion gas generated by the combustion of the combustion burner 34 passes through the combustion chamber 22a having the hot water supply heat exchanger 23 inside and is discharged from the exhaust port 22 to the outside of the apparatus.

  In addition, after supplying high temperature water heated by the hot water supply heat exchanger 23 to the primary flow path of the use side heat exchanger 24 via the circulation pump 7, the upstream water supply path of the hot water supply heat exchanger 23 is supplied. 1, and the hot water supply circulation circuit 2 is constituted which passes through the hot water supply heat exchanger 23 and reaches the use side heat exchanger 24 via the circulation pump 7. The hot water supply circulation circuit 2 can supply heat to a load connected to the secondary side flow path of the usage side heat exchanger 24 by supplying high temperature water as a primary side flow path of the usage side heat exchanger 24. Is possible.

  Here, as functions of the use-side heat exchanger 24, a heating heat exchanger 25 having a heating circuit 42 for supplying hot water to a heating terminal that performs heating, bathroom drying, and the like as a secondary-side flow path, and a bathtub 69 This shows a case where two heat output functions are provided for the bath heat exchanger 26 having the bath circuit 62 for heating the bath water 68 as a secondary side flow path.

  In particular, in the present embodiment, in order to realize two heat output functions of the heat exchanger 25 for heating and the heat exchanger 26 for bath, each of the hot water supply circulation circuits 2 which are a single primary side flow path is provided. By connecting the heating circuit 42 and the bath circuit 62, which are secondary flow paths, in parallel and forming the use-side heat exchanger 24 as a single unit, it is possible to reduce the size and weight of the appliance by simplifying the main body configuration. In addition, since a single primary side flow path can be formed, the heat radiation area can be reduced by that amount, heat loss can be reduced, and the efficiency of heat exchange with the secondary side flow path can be improved.

  Here, a specific configuration of the use side heat exchanger 24 in which a plurality of heat output functions are formed as a single unit as a single unit will be described.

  FIG. 2-1 shows an example of a structural diagram of the plate heat exchanger in the embodiment of the present invention. As for the detailed structure and manufacturing method of the plate heat exchanger, for example, in Patent Document 2, a heat transfer plate that forms a primary flow path having irregularities and a heat transfer plate that forms a secondary flow path are used as a brazing material. The contents are described that they can be stacked together and heated in a vacuum furnace to be in contact with a heating wire, making manufacture and assembly simple and reducing costs.

In FIG. 2-1, the details of the unevenness, brazing material, manufacturing method, etc. of each heat transfer plate are as follows:
For example, the contents described in Patent Document 2 are omitted as applied, and only the structure related to the present invention is shown in a simplified manner. In FIG. 2A, the secondary channel joint 101 and the primary channel joint 102 are connected to the top plate 103. The primary side channel joint 102 is the hot water supply circulation circuit 2 in FIG. 1, the secondary side channel joint 101 of the secondary side channel A is the heating circuit 42 in FIG. 1, the secondary side of the secondary side channel B The bath circuit 62 in FIG. 1 is connected to the flow path joint 101.

  The flow directions of the hot water in the primary side flow path, the secondary side flow path A, and the secondary side flow path B are opposite to each other as shown in FIG. The cross section along the line AA or the line BB in FIG. 2A shows a shape obtained by cutting the secondary channel joint 101 and the primary channel joint 102 vertically. From the top plate 103 to the bottom plate 104, the primary flow path and the secondary flow path are alternately arranged with the secondary heat transfer plate 106 and the primary heat transfer plate 105 interposed therebetween. The secondary side flow path is further divided into two chambers, a secondary side flow path A and a secondary side flow path B, by a partition 107 as shown in the cross section along line CC in FIG. 2-1.

  FIG. 2-2 shows the structure of the primary side heat transfer plate 105. In the DD line cross section or the EE line cross section of FIG. 2-2, the primary side flow path joint hole 109 is connected to the primary side flow path joint 102 and forms the primary side flow path. Since it is necessary to isolate the primary side flow path and the secondary side flow path in the secondary side flow path joint hole 108, a secondary side flow path closing folded portion 110 is provided.

  FIG. 2-3 shows the structure of the secondary heat transfer plate 106. In the FF line cross section or the GG line cross section, the secondary side flow path joint hole 111 is connected to the secondary side flow path joint 101 to form a secondary side flow path. Since the primary side flow path joint hole 112 needs to isolate the primary side flow path and the secondary side flow path, a primary side flow path closing folded portion 113 is provided. Further, a partition 107 is provided to separate the secondary side flow path into two rooms.

  For example, the partition 107 can be integrally formed by inserting a bending step in the manufacturing process of the secondary heat transfer plate 106. The position of the partition 107 provided on the secondary side heat transfer plate 106 is determined according to a plurality of heat output functions of the usage side heat exchanger 24, whereby the heat to the secondary side flow path in the usage side heat exchanger 24 is determined. Exchange efficiency can be optimized.

  For example, if the heat output at the time of rating of the heat exchanger 25 for heating is 12500 kcal / h, and the heat output at the time of rating of the heat exchanger 26 for bath is 7500 kcal / h, the secondary heat transfer plate 106 has an area ratio. When the partition 107 is integrally provided in the part that becomes 5: 3 and is made to correspond to the secondary side flow path A and the secondary side flow path B, respectively, the secondary side flow path A is the secondary of the heat exchanger 25 for heating. As the side channel, the secondary side channel B can be used as the secondary channel of the heat exchanger 26 for bath.

  The primary side heat transfer plate 105 and the secondary side heat transfer plate 106 are alternately stacked between the bottom plate 104 and the top plate 103 via a brazing material, and heated in a vacuum furnace as described in Patent Document 2. By making contact, manufacturing and assembly can be relatively simplified.

  As described above, when the plate-type heat exchanger shown in FIG. 2-1 is used as a single-unit use-side heat exchanger 24, for a single primary flow path (hot water supply circulation circuit 2), Since the secondary side flow path A (heating circuit 42) and the secondary side flow path B (bath circuit 62) are arranged in parallel, the temperature of the hot water flowing through the primary side flow path can be made substantially the same. That is, since the secondary side flow paths of the plurality of usage side heat exchangers are connected in parallel to the single hot water supply circulation circuit that is the primary side, the primary side of each usage side heat exchanger Since the temperature of the hot water flowing through the flow path can be made substantially the same, it is possible to reduce heat dissipation loss, improve the heat exchange efficiency with the secondary flow path, and provide a hot water supply device that realizes low running costs can do.

  In addition, the heat transfer area can be optimized and defined, and when heat exchange is performed simultaneously in a plurality of secondary flow paths, the primary side flow depends on the temperature and flow rate conditions of the fluid flowing in each secondary flow path. It is possible to prevent the amount of heat supplied from the path from being biased to one of the secondary flow paths.

  Now, in FIG. 1 again, in the hot water supply circulation circuit 2, the hot water supply passage 3 is in a state where a plurality of heat output functions are branched from the downstream side of the use side heat exchanger 24 formed as a single unit.

  Thus, the hot water supply circuit and the hot water supply circulation are arranged by disposing the branch portion from the hot water supply circulation circuit 2 of the hot water supply path 3 as a hot water supply circuit downstream of the use side heat exchanger 24 which is formed as a single unit. When the circuit 2 is used at the same time, a large amount of high-temperature water can be supplied to the primary-side flow path of the usage-side heat exchanger 24 in the hot-water supply circulation circuit 2. It has a feature that a large amount of heat can be supplied to the secondary channel.

  On the other hand, FIG. 3 shows the block diagram of the hot water supply apparatus in each of the first, second, fourth, fifth and sixth embodiments of the present invention.

  In FIG. 3, the present embodiment differs from the hot water supply apparatus in the first, third, fourth, fifth, and sixth embodiments shown in FIG. A configuration in which a plurality of heat output functions are branched from the upstream side of the use-side heat exchanger 24 formed as a single unit, and the other components having the same configuration and effects are denoted by the same reference numerals. Detailed description will be omitted, and different points will be mainly described.

  When the hot water supply circuit is used alone by arranging the branch portion from the hot water supply circulation circuit 2 of the hot water supply passage 3 upstream of the use side heat exchanger 24 that is made into a single unit in this way, The hot water supply passage 3 can obtain the high-temperature water immediately after leaving the hot water supply heat exchanger 23 without passing through the primary flow path of the use side heat exchanger 24. The desired hot water can be supplied to the tap 13 as soon as possible.

  In FIG. 1 or FIG. 3, the heating circuit 42 is formed as a secondary flow path of the heating heat exchanger 25 in the use-side heat exchanger 24 that is made into a single unit, such as a bathroom dryer. By connecting the load of the heating terminal to form a closed circuit and circulating the secondary side hot water by the heating pump 50, the high temperature flowing through the hot water supply circulation circuit 2 which is the primary side flow path in the heating heat exchanger 25 Heat is supplied from water.

  In FIG. 1 or FIG. 3, the bath circuit 62 is formed as a secondary flow path of the bath heat exchanger 26 in the use side heat exchanger 24 that is formed as a single unit. By circulating the water 68, the bath heat exchanger 26 is supplied with heat from the high-temperature water flowing through the hot water supply circuit 2, which is the primary flow path, and reheats the bath water 68 to a desired temperature. You can drive. In addition, as a pouring channel 61 for performing bath hot water supply operation for supplying a predetermined amount of hot water of a predetermined temperature to the bathtub 69, a circuit system that branches from the hot water supply passage 3 downstream of the bypass passage 4 and communicates with the bath circuit 62. Is forming.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. First, at the time of hot water supply single operation using the hot water supply circuit, when the hot water tap 13 such as a shower or a currant is opened in FIG. 1 or FIG. 3, the incoming flow rate sensor 5 disposed in the water supply path 1 detects water flow. The combustion fan 31 operates in response to the signal, and at the same time, the fuel gas main valve 32 and the fuel gas proportional control valve 27 are opened, fuel gas and combustion air are supplied to the combustion burner 34, and spark discharge of the spark plug 29 by the igniter 28 is performed. The combustion is started by the ignition recognition operation by the frame rod 30.

  The amount of combustion in the combustion burner 34 according to the combustion load is determined by switching the combustion portion of the combustion burner 34 by opening and closing the fuel gas switching valve 33 and the predetermined opening degree of the fuel gas proportional control valve 27. Is adjusted by a combination of the fuel gas supply amount by adjusting the amount of combustion and the combustion air supply amount by adjusting the rotational speed of the combustion fan 31. In the process of exhausting the combustion gas, the water supplied from the water supply path 1 is heated by the hot water supply heat exchanger 23.

  The hot water heated by the hot water supply heat exchanger 23 opens the bypass control valve 9 disposed in the bypass passage 4 provided by connecting the hot water supply path 1 and the hot water supply path 3 so as to bypass the hot water supply heat exchanger 23. The water is mixed with a part of the water supplied from the water supply channel 1 by adjusting the degree. The control means 91 for controlling the various operations controls the hot water from the hot water thermistor 17 so that the mixed hot water has a desired set temperature set by a remote controller for remote operation such as a remote controller for bathroom 92 or a remote controller for kitchen 93. While detecting the hot water temperature after mixing, the opening degree of the bypass control valve 9 is adjusted and supplied to the hot water tap 13.

  Specifically, the temperature of hot water supplied to the tap tap 13 is about 35 ° C to 60 ° C. In FIG. 1, for example, 42 ° C. hot water is supplied to the hot water tap 13 in a configuration in which the branching portion from the hot water supply circulation circuit 2 of the hot water supply passage 3 is arranged on the downstream side of the use-side heat exchanger 24 formed as a single unit. In this case, for example, the control means 91 adjusts the combustion amount of the combustion burner 34 so that the hot water temperature detected by the hot water return thermistor 16 becomes 70 ° C., and the hot water temperature detected by the hot water thermistor 17 becomes 42 ° C. The operation control for adjusting the opening degree of the bypass control valve 9 is performed.

  On the other hand, in the configuration in which the branching portion from the hot water supply circulation circuit 2 of the hot water supply passage 3 in FIG. 3 is arranged on the upstream side of the use-side heat exchanger 24 formed as a single unit, For example, the control means 91 adjusts the amount of combustion of the combustion burner 34 so that the temperature of hot water detected by the hot water supply thermistor 15 is 70 ° C., and the temperature of hot water detected by the hot water thermistor 17 is 42. Operation control is performed to adjust the opening degree of the bypass control valve 9 so that the temperature becomes ° C.

  In the configuration of FIG. 3, the branch portion from the hot water supply circulation circuit 2 of the hot water supply passage 3 is arranged upstream of the use side heat exchanger 24 that is made into a single unit. The flow path pressure loss can be reduced, and hot water can be supplied to the hot water outlet 3 quickly.

  Thus, when selecting the hot water supply independent operation using the hot water supply circuit, the desired temperature is set by the remote controller for remote operation, and the hot water supply hot water having the desired temperature set automatically is secured by opening the tap tap 13. be able to.

  Next, in FIG. 1 or FIG. 3, as the use side heat exchanger 24 formed as a single unit, a heating circuit 42 for supplying hot water to a heating terminal that performs heating, bathroom drying or the like is provided on the secondary side. A case where two heat output functions are provided, that is, a heating heat exchanger 25 that is a flow path and a bath heat exchanger 26 that has a bath circuit 62 that heats the bathtub water 68 of the bathtub 69 as a secondary flow path. Therefore, the case where the heating operation and the bath reheating operation are performed as the operation using the hot water supply circulation circuit 2 will be described below.

  During the heating operation, the water amount control valve 8 is closed by the operation command from the controller (not shown) built in the heating terminal such as a bathroom dryer or the remote controller 94 for floor heating, and only the hot water supply circulation circuit 2 is A closed circuit is formed, the heating pump 50 provided in the heating circuit 42 is driven, the circulation pump 7 that circulates the hot water in the hot water supply circulation circuit 2 is driven in conjunction with this operation command, and at the same time by the ignition operation of the combustion burner 34 Combustion starts. The high-temperature water heated by the hot water supply heat exchanger 23 is supplied to the primary side of the use side heat exchanger 24 by the circulation pump 7 and is heat-exchanged by the water-water heat exchange configuration, and the secondary side of the heating heat exchanger 25. The heat is transferred to the heating circuit 42.

  The heating circuit 42 of FIG. 1 or 3 shows a two-temperature type configuration that can supply hot water of two different temperatures to the heating terminal. The hot water in the heating circuit 42 heated by the heating heat exchanger 25 is supplied as it is through the heating forward flow path 43 when used in a high-temperature terminal such as a bathroom dryer. When used in a low temperature terminal such as a floor heating hot water mat, the return warm water from each heating terminal stored in the heating tank 49 through the heating return flow path 45 is used as a heating forward having the check valve 53. It is mixed with high-temperature water flowing through a low-temperature bypass flow path 46 branched from the flow path 43 and supplied through a low-temperature heating forward flow path 44.

  The heating tank 49 is open to the atmosphere, and the heating tank 49 is provided with a water reducing electrode 52 that detects the amount of retained water in the heating circuit 42 that has decreased due to evaporation or the like, and a full water electrode 51 that detects the amount of retained water. A replenishment water channel 41 branched from the water supply channel 1 and having a replenishment water valve 55 is connected. When the water reducing electrode 52 is turned off and the amount of water held in the heating tank 49 becomes less than the water reducing electrode 54, the makeup water valve 55 is opened, and water is supplied from the makeup water channel 41 to the heating tank 49 until the full water electrode 51 is turned on. It has become.

  The high-temperature water in the primary flow path heat-exchanged by the heating heat exchanger 25 returns to the water supply path 1 upstream of the hot water supply heat exchanger 23 to form a hot water supply circulation circuit 2 and a heating operation command from the heating terminal. Is kept at a predetermined temperature while hot water circulation is continued.

  Next, at the time of bathing operation, in FIG. 1 or FIG. 3, when the user gives an instruction for bathing operation by the bathroom remote controller 92, the bath pump 75 provided in the bath circuit 62 is driven, and the water flow switch 76. When the circulation of the bath water 68 is detected, the water amount control valve 8 is closed by the detection signal to form a closed circuit of only the hot water supply circulation circuit 2, and the circulation pump 7 for circulating the hot water supply circulation circuit 2 is driven. At the same time, combustion is started by the ignition operation of the combustion burner 34. Here, as the water flow switch 76, for example, a butterfly portion provided in a flow path and attached with a magnet is pushed up at a water flow rate of a predetermined (for example, 2.8 L / min) or more and is electrically connected to detect water flow. The structure of the flow rate switch is considered.

  The high-temperature water heated by the hot water supply heat exchanger 23 is supplied to the primary side of the use side heat exchanger 24 by the circulation pump 7 and is heat-exchanged by the water-water heat exchange configuration. Heat is transferred to the bath circuit 62 which is the next side. The heat of the bath circuit 62 received by the bath heat exchanger 26 increases the temperature of the bathtub water 68 of the bathtub 69 to ensure a predetermined reheating water temperature. And the high temperature water heat-exchanged by the use side heat exchanger 24 returns to the water supply path 1 upstream of the hot water supply heat exchanger 23, forms a hot water supply circulation circuit 2, and is set by the bathroom remote controller 92. Circulation is continued while maintaining a predetermined hot water temperature until a predetermined reheating temperature is detected by the bath return thermistor 83.

  In FIG. 1 or FIG. 3, a circulating flow rate sensor 6 having a flow rate sensor structure similar to the incoming water flow rate sensor 5 is provided in the hot water supply circulation circuit 2. By providing the circulation flow rate sensor 6 in the hot water supply circulation circuit 2, it is possible to detect the circulation flow rate of the hot water supply circulation circuit 2. Therefore, when the circulation pump 7 is configured as a direct current drive pump (hereinafter referred to as a DC pump) whose output is variable according to the drive load, each use is performed during heating operation, bath reheating operation, or simultaneous operation thereof. Depending on the secondary side load of the side heat exchanger, the driving load of the circulation pump can be changed, and hot water with an optimum flow rate can be conveyed to the hot water supply circulation circuit 2.

  Further, an overpressure relief flow path 72 having an overpressure relief valve 79 and an overpressure relief open / close valve 78 is provided in parallel with the pouring flow path 61 branched from the hot water discharge path 3. In the operation using the hot water supply circulation circuit 2 in the heating operation or the bath reheating operation, the hot water supply circulation circuit 2 becomes a closed circuit and is heated by the heat exchanger 23 for hot water supply. It expands and the internal pressure rises.

  Accordingly, during operation using the hot water supply circulation circuit 2, the overpressure relief valve 78 is opened, and when the internal pressure in the hot water circulation circuit 2 rises, the overpressure relief valve 79 is actuated to release the pressure to the bath circuit 62, and the predetermined pressure is reached. It is made to become below the pressure. Here, the overpressure relief valve 79 has a structure that is set by a spring force so as to be opened at 1.0 MPa and closed at 0.7 MPa, for example.

  In the case of operation using the hot water supply circulation circuit 2, the temperature of hot water supplied to the primary side flow path of the use side heat exchanger 24 is the heating forward flow path when operating a high temperature terminal such as a bathroom dryer. Since 80 ° C. is required as the temperature of the hot water supplied to 43, about 85 ° C., which is higher than that temperature, is required, and the control means 91 causes the hot water temperature detected by the hot water supply thermistor 15 to be 85 ° C. The amount of combustion in the combustion burner 34 is adjusted.

  During the heating operation, the control means 91 is driven by direct current so that the temperature of hot water detected by the heating thermistor 54 is 80 ° C. and the temperature of hot water detected by the heating thermistor 54 is 80 ° C. The operation control is performed to adjust the combustion amount of the combustion burner 34 while adjusting the driving load of the circulating pump 7 (referred to as DC driving).

  At the time of bathing operation, the control means 91 sets the driving load of the DC-driven circulation pump 7 to, for example, the maximum driving load amount so that the hot water temperature detected by the hot water supply thermistor 15 becomes 85 ° C. The operation control is performed to adjust the combustion amount of the combustion burner 34 while maintaining a predetermined driving load amount, and a predetermined reheating temperature (for example, 42 ° C.) set by the bathroom remote controller 92 is detected by the bath return thermistor 83. Continue the bath chasing operation.

  As described above, in the present embodiment, the heating circuit 42 and the bath circuit 62, which are the secondary flow paths, are used for the heating heat exchanger 25 for the plurality of heat output functions of the heating operation and the bath reheating operation. When the plate-type heat exchanger having the structure as shown in FIG. 2-1 is used as the use-side heat exchanger 24 as a single unit, the heat exchange for heating is performed. The primary flow paths of the heater 25 and the bath heat exchanger 26 are simplified and formed by the single hot water supply circulation circuit 2, and the heating heat exchanger 25 and the bath heat exchanger 26 are arranged on a single use side. It is formed as a heat exchanger 24, and it is possible to realize a reduction in size and weight of the instrument.

  In addition, by using a single primary side flow path of the use side heat exchanger 24 having a plurality of heat output functions, heat dissipation loss of high temperature water flowing through the primary side flow path is reduced, and The heat exchange efficiency can be improved.

  The operation method using either the hot water supply circuit or the hot water supply circulation circuit 2 has been described above. Next, the operation method when the hot water supply circuit and the hot water supply circulation circuit 2 are used simultaneously will be described.

  When the hot water supply circuit and the hot water supply circulation circuit 2 are used at the same time, it is necessary to exchange heat with the secondary side flow path by the use side heat exchanger 24, so that the control means 91 detects that the temperature detected by the hot water supply thermistor 15 is It is necessary to control the operation so that a predetermined control temperature (for example, 85 ° C.) is higher than a temperature required for the secondary side flow path of the heat exchanger 24 (for example, 80 ° C. in the case of the heating circuit 42).

  At this time, the operation control on the side of the hot water supply circuit is different between the case of FIG. 1 and the case of FIG. The operation control on the hot water supply circuit 2 side is performed in the heating operation and the bath reheating operation because a predetermined control temperature (for example, 85 ° C.) is supplied to the hot water supply circuit 2 in both FIG. 1 and FIG. This is the same as the operation control using the hot water supply circulation circuit 2 alone, and there is no direct influence on the temperature control due to the use of the hot water supply circuit.

  In the configuration of FIG. 1 in which the branch portion from the hot water supply circulation circuit 2 of the hot water supply passage 3 is arranged on the downstream side of the use side heat exchanger 24, the heat exchange state to the secondary side flow path of the use side heat exchanger 24 is performed. Since the hot water temperature detected by the hot water return thermistor 16 varies depending on the temperature of the hot water return thermistor 16, the controller 91 monitors the temperature detected by the hot water return thermistor 16, while the hot water temperature detected by the hot water return thermistor 17 is the desired temperature (for example, 42 The operation control for adjusting the opening degree of the bypass control valve 9 is performed so that

  As described above, in the configuration in which the branch portion of the hot water outlet 3 exists downstream of the use side heat exchanger 24, a large amount of high-temperature water can be supplied to the primary side flow path of the use side heat exchanger 24. The rising characteristics of the hot water heating that flows through the secondary flow path of the vessel 24 are advantageous. However, since the temperature of hot water supplied to the hot water supply passage 3 may vary depending on the heat exchange state of the use side heat exchanger 24, the bypass control valve 9 is frequently operated, and the hot water temperature is as shown in FIG. There is a possibility that it will be more variable than the configuration.

  Further, when the hot water return temperature is lowered due to the heat exchange state of the use side heat exchanger 24, there is a possibility that the hot water supply temperature at the high temperature set temperature (for example, at the set temperature of 60 ° C.) cannot be supplied. At this time, when the circulation pump 7 is configured as a DC pump having a variable drive load, the control means 91 drives the circulation pump 7 at the maximum number of rotations, and the temperature of hot water detected by the hot water supply return thermistor 16 is possible. Operation control is performed so that the temperature exceeds the required hot water temperature (for example, 60 ° C.).

  On the other hand, in the configuration of FIG. 3 in which the branch portion from the hot water supply circulation circuit 2 of the hot water supply passage 3 is arranged on the upstream side of the use side heat exchanger 24, the secondary side of the use side heat exchanger 24 is different from the configuration of FIG. There is no influence of the heat exchange state on the side flow path, and the control means 91 determines that the temperature of the hot water detected by the hot water thermistor 17 is the desired temperature (for example, 85 ° C.) with respect to a predetermined predetermined control temperature (for example, 85 ° C.) For example, operation control is performed to adjust the opening degree of the bypass control valve 9 so as to be 42 ° C.

  Thus, in the configuration in which the branch portion of the hot water supply passage 3 exists upstream of the use side heat exchanger 24, the hot water supply temperature at which the hot water temperature supplied to the hot water supply passage 3 is a constant control temperature (for example, only the hot water supply circuit is used). When the hot water supply single operation is performed, the bypass control valve 9 is operated more frequently than the configuration of FIG. 1 because 70 ° C. is supplied when the hot water supply circuit and the hot water circulation circuit 2 are used simultaneously. Therefore, stable and stable tapping temperature control can be performed.

  Further, since the hot water outlet 3 can obtain hot water immediately after leaving the hot water supply heat exchanger 23 without passing through the primary flow path of the use side heat exchanger 24, the flow pressure loss is reduced. The desired hot water can be supplied to the tap tap 13 as soon as possible. However, since a part of the high temperature hot water to be transported to the hot water supply circulation circuit 2 of the use side heat exchanger 24 flows into the hot water outlet 3, a large amount of hot water flowing through the secondary side flow path of the use side heat exchanger 24 is exchanged. When there is a demand for heat, the rising characteristics of hot water heating that flows through the secondary side flow path may be inferior to the configuration of FIG.

  At this time, when the circulation pump 7 is configured as a DC pump whose drive load is variable, the control means 91 drives the circulation pump 7 at the maximum number of revolutions to supply as much hot water as possible to the hot water supply circulation circuit 2. Thus, the operation control is performed to improve the rising characteristics of the hot water heating that flows through the secondary side flow path.

  The amount of combustion in the combustion burner 34 of FIGS. 1 and 3 is calculated by calculating the required combustion load from the water temperature supplied to the heat exchanger 23 for hot water supply, the water temperature to be supplied, and the supply flow rate. By switching the combustion portion of the combustion burner 34 by opening and closing the combustion gas switching valve 33, and adjusting the opening of the fuel gas proportional control valve 27, the fuel gas supply amount and the combustion fan 31 It adjusts by the combination with the combustion air supply amount by adjusting a rotation speed.

  Specifically, during a single hot water supply operation using only a hot water supply circuit, the water temperature supplied to the hot water heat exchanger 23 is the incoming water thermistor 14, the output control water temperature to be supplied is the hot water supply thermistor 15, and the supply flow rate is circulated. The combustion load detected by the flow sensor 6 can be calculated. At the time of heating operation using only the hot water supply circulation circuit 2 or bath reheating operation, the water temperature supplied to the hot water supply heat exchanger 23 is circulated by the hot water supply return thermistor 16, and the output control water temperature to be supplied is circulated by the hot water supply thermistor 15. The supply flow rate by driving the pump 7 is detected by the circulation flow rate sensor 6 and the combustion load can be calculated.

  On the other hand, at the time of operation using the hot water supply circuit and the hot water supply circulation circuit 2 at the same time, as in the operation using either the hot water supply circuit or the hot water supply circulation circuit 2, output control to be supplied by the hot water supply heat exchanger 23 is performed. The water temperature can be directly detected by the hot water supply thermistor 15 and the supply flow rate can be directly detected by the circulation flow sensor 6. The water temperature supplied to the hot water heat exchanger 23 can be detected at the inlet of the hot water heat exchanger 23 by a thermistor or the like. Since the detection means is not provided, it cannot be detected directly. Therefore, the control means 91 calculates in the case of the configuration of FIG. 1 and the case of the configuration of FIG. 3 as follows.

First, in FIG. 1, the water temperature supplied to the hot water supply heat exchanger 23 is Tx (° C.), and the flow rate flowing through the hot water supply circulation circuit 2 before branching from the hot water supply passage 3 detected by the circulation flow rate sensor 6 is q ₂ ( L / min), the temperature of the hot water detected by the hot water supply return thermistor T ₂ (° C.), the flow rate before being mixed with the water flowing through the bypass passage 4 after branching from the hot water supply circulation circuit 2 and entering the hot water supply passage 3 Q ₃ (L / min), the temperature of the feed water detected by the incoming water thermistor 14 is T ₄ (° C.), the amount of supplied water detected by the incoming water flow rate sensor 5 is q ₁ (L / min), Assuming that the amount of water that branches and flows through the bypass passage 4 is q ₄ (L / min), equation (1) is established from the relationship of the amount of heat at the junction of the hot water supply circulation circuit 2 and the water supply passage 1.

Txq ₂ = T ₂ (q ₂ −q ₃ ) + T ₄ (q ₁ −q ₄ ) (1)
When equation (1) is solved for Tx, equation (2) is obtained.

Tx = ((q ₂ −q ₃ ) / q ₂ ) T ₂ + ((q ₁ −q ₄ ) / q ₂ ) T ₄ (2) In equation (2), q ₃ and q ₄ are actuators Since it cannot be directly detected by the above, it is considered that q ₃ and q ₄ are deleted from the equation (2). The hot water flow rate supplied from the hot water tap 13 can be expressed as q ₃ + q ₄ . Further, the equation (3) is established from the relationship of the flow rate at the junction of the hot water supply circulation circuit 2 and the water supply channel 1.

q ₂ = (q ₂ −q ₃ ) + (q ₁ −q ₄ ) (3)
If q ₂ is eliminated from both sides of the equation (3), the result becomes the same as the equation (4).

q ₃ + q ₄ = q ₁ (4)
That is, the hot water flow rate supplied from the hot water tap 13 is the same as the supplied water amount q ₁ detected by the incoming water flow rate sensor 5. Whereas the relationship between the amount of heat in the junction of the pouring passage 3 and the bypass passage 4, when the temperature of the hot water supplied from the hot water tap 13 detected by the hot water thermistor 17 and T _3, (5) expression holds.

T ₃ q ₁ = T ₂ q ₃ + T ₄ q ₄ (5)
From the equations (4) and (5), when q ₃ and q ₄ are solved, q ₃ and q ₄ are expressed by equations (6) and (7), respectively.

q ₃ = ((T ₃ −T ₄ ) / (T ₂ −T ₄ )) q ₁ (6)
q ₄ = ((T ₂ −T ₃ ) / (T ₂ −T ₄ )) q ₁ (7)
When the equations (6) and (7) are substituted into the equation (2), the water temperature supplied to the hot water supply heat exchanger 23 is expressed by the equation (8).

Tx = T ₂ − (T ₃ −T ₄ ) q ₁ / q ₂ (8)
Next, in FIG. 3, the water temperature supplied to the hot water supply heat exchanger 23 is Tx (° C.), and the flow rate flowing through the hot water supply circulation circuit 2 after branching from the hot water supply passage 3 detected by the circulation flow rate sensor 6 is q ₂ ( L / min), the temperature of the hot water detected by the hot water supply return thermistor T ₂ (° C.), the flow rate before being mixed with the water flowing through the bypass passage 4 after branching from the hot water supply circulation circuit 2 and entering the hot water supply passage 3 Q ₃ (L / min), the temperature of the feed water detected by the incoming water thermistor 14 is T ₄ (° C.), the amount of supplied water detected by the incoming water flow rate sensor 5 is q ₁ (L / min), Assuming that the amount of water that branches and flows through the bypass passage 4 is q ₄ (L / min), Equation (9) is established from the relationship of the amount of heat at the junction of the hot water supply circulation circuit 2 and the water supply passage 1.

Tx (q ₂ + q ₃ ) = T ₂ q ₂ + T ₄ (q ₁ −q ₄ ) (9)
When equation (9) is solved for Tx, equation (10) is obtained.

_{Tx = (q 2 / (q} 2 + q 3)) T 2 + ((q 1 -q 4) / (q 2 + q 3)) T 4 ··· (10)
In equation (10), q ₃ and q ₄ cannot be directly detected by an actuator or the like, and therefore, q ₃ and q ₄ are considered to be deleted from equation (10). In the case of FIG. 3 as well, the formula (4) is established, and the temperature of hot water supplied from the hot water tap 13 detected by the hot water thermistor 17 is determined from the relationship between the amount of heat at the junction of the hot water passage 3 and the bypass passage 4 with T _3, when the temperature detected by the hot water forward thermistor 15 and _{T 1,} (11) equation is established.

T ₃ q ₁ = T ₁ q ₃ + T ₄ q ₄ (11)
When q ₃ and q ₄ are solved from the equations (4) and (11), q ₃ and q ₄ are expressed by the equations (12) and (13), respectively.

q ₃ = ((T ₃ −T ₄ ) / (T ₁ −T ₄ )) q ₁ (12)
q ₄ = ((T ₁ −T ₃ ) / (T ₁ −T ₄ )) q ₁ (13)
When the equations (12) and (13) are substituted into the equation (10), the water temperature supplied to the hot water supply heat exchanger 23 is expressed by the equation (14).

Tx = (1 / (1 + A)) T ₂ + (A / (1 + A)) T ₄ (14)
However, in Formula (14), A is Formula (15).

_{A = (q 1 / q 2} ) ((T 3 -T 4) / (T 1 -T 4)) ··· (15)
Thus, the control means 91 can calculate the water temperature supplied to the hot water supply heat exchanger 23 based on the equation (8) in the configuration of FIG. 1 and on the basis of the equation (14) in the configuration of FIG. .

  As described above, the operation using the hot water supply circuit as the operation using the hot water supply circuit, the operation using the hot water supply circulation circuit 2 as the operation using the hot water supply circulation circuit 2, and the operation using the hot water supply circuit and the hot water supply circulation circuit 2 simultaneously. Lastly, in FIG. 1 or FIG. 3, hot water of a predetermined temperature and a predetermined amount of hot water is supplied from the pouring channel 61 branched from the downstream portion of the bypass passage 4 of the hot water passage 3 to the bathtub 69 through the bath circuit 62. The operation of the hot water bath operation will be described.

The bath hot water operation is an operation using the pouring channel 61 branched from the hot water supply circuit, and is basically the same as the operation of the hot water single operation, and the bath hot water operation using the pouring channel 61 is performed. It is also possible to carry out hot water operation simultaneously while supplying hot water from the tap 13. However, the temperature detected by the hot water thermistor 17 that realizes the bath hot water temperature has priority over the hot water supply operation when hot water operation is performed simultaneously with hot water being supplied from the hot water tap 13, and from the hot water tap 13, Temperature hot water is supplied.

  In addition, a hot water bath operation can be performed while performing a heating operation using the hot water supply circulation circuit 2. The operation of the bath hot water operation will be described below corresponding to the configuration of FIG.

  FIG. 4 shows the flow of hot water or water with arrows in the figure when the bath / hot water operation is independently performed in the configuration of FIG. When the user sets a predetermined temperature and a predetermined amount of hot water using the bathroom remote controller 92 and instructs bath hot water operation, the control means 91 opens the pouring valve 77 provided in the pouring channel 61, and The same operation control as the hot water supply operation using the hot water supply circuit is performed. One of the hot water supplied from the pouring channel 61 to the bath circuit 62 passes through the bath return channel 64, the bath return pipe 66, and the bath circulation adapter 67 to the bathtub 69, and the other is the bath heat exchanger 26. Are supplied to the bathtub 69 from two directions through the bath circuit 62, the bath outlet channel 63, the bath outlet pipe 65, and the bath circulation adapter 67.

  The predetermined temperature supplied to the bathtub 69 was heat-exchanged with the hot water detected by the bath return thermistor 83 via the bath return channel 64 and the bath heat exchanger 26 via the bath return channel 63. This is realized by mixing with hot water detected by the bathing thermistor 82. Here, the temperature detected by the bath return thermistor 83 is the same as the temperature of the hot water detected by the hot water thermistor 17 and supplied to the pouring channel 61.

  Moreover, since the hot water that has passed through the hot water supply circulation circuit 2 that is the primary flow path of the bath heat exchanger 26 diverges and flows to the hot water discharge path 3, the hot water is supplied from the pouring flow path 61 that passes through the bath flow path 63. The hot water thus heated is heated when it flows through the secondary flow path of the bath heat exchanger 26. Therefore, the control means 91 needs to perform the hot water temperature control in the hot water thermistor 17 so that the temperature of the bathtub water 68 becomes the predetermined temperature set.

In FIG. 4, the flow rate detected by the pouring flow rate sensor 73 is q ₅ (L / min), the flow rate rate passing through the bath flow path 63 is α, and the set predetermined temperature to be poured is T ₆ ( ° C.), the temperature of T _{5 (°} C. detected by the bath forward thermistor 82), when the temperature detected by the hot water thermistor 17 to control the hot water temperature and T _{3 (°} C.), bath outward flow path 63 side and the bath return flow Equation (16) holds from the relationship between the amount of hot water poured from the path 64 side.

T ₆ q ₅ = T ₅ αq ₅ + T ₃ (1-α) q ₅ (16)
When the equation (16) is solved for α, the equation (17) is obtained.

α = (T ₆ −T ₃ ) / (T ₅ −T ₃ ) (17)
In the equation (17), T ₆ is known as the set predetermined temperature, and T ₅ can be directly detected by the bathing thermistor 82.

On the other hand, the temperature detected by the hot water supply thermistor 15 is T ₁ (° C.), the temperature of hot water detected by the hot water return thermistor 16 is T ₂ (° C.), and the hot water supply path 3 detected by the circulation flow sensor 6 branches off. Assuming that the flow rate flowing through the previous hot water supply circulation circuit 2 is q ₂ (L / min), the equation (18) is established from the relationship of heat exchange in the use side heat exchanger 24.

(The amount of heat received by the secondary flow path (heating circuit 42) of the heat exchanger 25 for heating)
+ (Amount of heat received by the secondary side flow path (bath circuit 62) of the heat exchanger 26 for bath)
= (Supply heat amount of the primary side flow path (hot water supply circulation circuit 2) of the use side heat exchanger 24) (18) Only the bath hot water operation is performed without performing the heating operation using the heating heat exchanger 25. In the case of (1), the first term on the left side of the equation (18) can be set to zero, and the equation (19) is obtained.

αq ₅ (T ₅ -T ₃ ) = q ₂ (T ₁ -T ₂ ) (19)
When equation (19) is solved for α, α can be expressed by equation (20).

α = (q ₂ / q ₅ ) ((T ₁ −T ₂ ) / (T ₅ −T ₃ )) (20)
(17) and (20) and solving for _{T 3} to erase from α-type, the detected temperature _{T 3} in the tapping thermistor 17 to control the hot water temperature is expressed by equation (21).

T ₃ = T ₆ − (q ₂ / q ₅ ) (T ₁ −T ₂ ) (21)
When performing only the bath hot water operation according to the equation (21), the control means 91 uses the predetermined temperature T ₆ to be poured into the set bathtub 69, the flow rate q ₂ (L / Min), the flow rate q ₅ (L / min) detected by the pouring flow sensor 73, the temperature T ₁ detected by the hot water supply thermistor 15, and the hot water temperature T ₂ (° C.) detected by the hot water return thermistor 16. while detecting the can determine a target control temperature T ₃ of the hot water thermistor 17 to control the hot water temperature.

When the flow rate q ₅ (L / min) detected by the pouring flow rate sensor 73 is integrated and the pouring operation of a predetermined amount of hot water is completed, the control means 91 performs the same operation control as the bath reheating operation and returns to the bath. It is confirmed whether the temperature detected by the thermistor 83, that is, the temperature of the poured bath water 68 is a predetermined temperature. If the bath water 68 poured into the tub 69 has cooled down due to the time required for the pouring operation, the bath pouring operation is continued and the boiling operation is continued until the set temperature is reached.

  When the bath hot water operation is performed independently as described above, the control means 91 may control the hot water temperature of the hot water thermistor 17 based on the equation (21), but the heating operation using the use side heat exchanger 24 and the bath When the hot water operation is performed simultaneously, the first term on the left side of the equation (18) cannot be made zero, so that the hot water temperature control in the hot water thermistor 17 based on the equation (21) cannot be performed.

Therefore, the bath hot water beam operation is performed independently during the trial operation performed at the time of equipment installation, and α calculated by substituting the temperature T ₃ detected by the hot water thermistor for hot water temperature control into T ₇ as T ₇ is expressed as α ₁ and when performing the heating operation using the use side heat exchanger 24 and the hot water bath operation at the same time, α ₁ is substituted into the equation (17) and calculated by the equation (23). ₃ , the control means 91 controls the hot water temperature in the hot water thermistor 17. That is, the bath / hot water operation is performed independently during the trial operation, and α ₁ is learned as shown in equation (22).

α ₁ = (T ₆ −T ₇ ) / (T ₅ −T ₇ ) (22)
By substituting α ₁ in equation (22) for α in equation (17) and solving for T ₃ , the hot water temperature is increased by the hot water thermistor 17 when performing bath hot water operation simultaneously with the heating operation using the use side heat exchanger 24. determining the _{T 3} to be controlled.

T ₃ = (T ₆ −α ₁ T ₅ ) / (1−α ₁ ) (23)
On the other hand, the predetermined amount of hot water supplied to the bathtub 69 is obtained by integrating the pouring flow rate detected by the pouring flow rate sensor 73 having the same structure as the incoming water flow rate sensor 5 and the circulating flow rate sensor 6 provided in the pouring channel 61. You can ask for it. When bath hot water operation is performed from a state in which the bathtub water 68 is present in the bathtub 69 as the remaining hot water, it is necessary to first calculate how much hot water is to be poured after remaining with respect to the predetermined amount of hot water. is there.

In the case of the configuration of FIG. 1 or FIG. 3, not a water level system having a water level sensor (not shown) that detects the water pressure corresponding to the water level of the bathtub water 68 through the bath circulation adapter 67, but a predetermined amount of hot water set. The amount of water is poured by the pouring flow rate sensor 73, and even if the bathtub water 68 exists as the remaining hot water, its presence cannot be detected directly. The water level sensor is usually provided in the bath return channel 64.

As a method of calculating the remaining hot water in the configuration of the water quantity formula of FIG. 1 and FIG. 3, the recirculation flow q ₆ (L / min) of the bath circuit 62 is learned by performing a bath rebirth operation during a trial operation performed at the time of equipment installation. If it is determined that there is remaining hot water during hot water operation, the remaining hot water is calculated based on the circulation flow rate q ₆ (L / min) of the bath circuit 62 learned while performing the bath chasing operation. Perform hot water calculation. Hereinafter, a method for learning the circulation flow rate q ₆ (L / min) of the bath circuit 62 during the trial operation and a method for calculating the remaining hot water performed during the bath hot water operation will be described.

During equipment installation, by performing the bath water beam operating at a predetermined temperature and a predetermined amount of hot water in the manner described above, the flow rate passing through the bath forward channel 63 performs learning such as alpha _1. For example, the bath hot water driving operation is performed for a predetermined time alone after the bath hot water driving operation is completed. In FIG. 4, the temperature detected by the hot water supply thermistor 15 is T ₁ (° C.), the temperature of hot water detected by the hot water return thermistor 16 is T ₂ (° C.), and the flow rate detected by the circulating flow sensor 6 is q _2. (L / min), the temperature detected by the bath thermistor 82 is T ₅ (° C.), the temperature detected by the bath return thermistor 83 is T ₈ (° C.), and the circulation flow rate of the bath circuit 62 is q ₆ (L / min)), the equation (24) is established from the relationship of heat exchange in the bath heat exchanger 26.

q ₆ (T ₅ −T ₈ ) = q ₂ (T ₁ −T ₂ ) (24)
When equation (24) is solved for q ₆ , q ₆ can be obtained as in equation (25).

q ₆ = q ₂ (T ₁ -T ₂ ) / (T ₅ -T ₈ ) (25)
In order to learn q ₆ with higher accuracy, for example, a bath chasing operation is performed independently for a predetermined time (for example, 3 minutes) during the test operation, and a predetermined number m (for example, 18) is performed at predetermined time intervals (for example, 10 seconds) during that time. Q ₆ is calculated, and the circulation flow rate q ₆ of the bath circuit 62 is determined by the average value thereof. That is,
q ₆ = (1 / m) Σq ₆ (i) (26)
However, in the equation (26), q ₆ (i) indicates the i-th calculated circulation flow rate.

A method of calculating remaining hot water performed during bath hot water operation using q ₆ learned during the trial operation as described above will be described below.

  When the bath hot water operation is started, the controller 91 first drives the bath pump 75. At that time, when the water flow switch 76 is continuously turned OFF for a predetermined time (for example, 90 seconds), or when the water flow switch 76 is repeatedly turned ON / OFF for a predetermined time (for example, 90 seconds), the control means 91 is switched to the bathtub 69. It is determined that there is no remaining hot water, and a predetermined amount of hot water set by the user is integrated by the pouring flow rate sensor 73 to perform bath hot water operation.

When the water flow switch 76 is continuously turned on for a predetermined time (for example, 90 seconds), the control means 91 determines that there is remaining hot water in the bathtub 69, and the temperature detected by the bath return thermistor 83 is the predetermined temperature ΔT (° C.). (
Here, Δ is used as a commonly called “delta” character and is used in the same manner below). The time until the temperature detected by the bath return thermistor 83 rises by a predetermined temperature ΔT (° C.) is calculated by Δt (min), and the amount of heat received by the bath circuit 62 that is the secondary side flow path of the bath heat exchanger 26 is calculated. If the time interval to perform is Δτ (min), the total number of times of calculating the amount of heat received is | Δt / Δτ |.

However, | Δt / Δτ | represents an integer part of Δt / Δτ. Q (L) for remaining hot water in bathtub 69
The circulation flow rate learned during the trial operation is q ₆ (L / min), the temperature detected by the bathing thermistor 82 when calculating the heat reception amount jth is T ₅ (j) (° C.), and the heat reception amount jth Assuming that the temperature detected by the bath return thermistor 83 at the time of calculation is T ₈ (j) (° C.), the remaining hot water Q (L) rises in temperature by ΔT (° C.), and the relationship between the amount of heat received and the equation (27) Holds.

QΔT = Σ (q ₆ (T ₅ (j) −T ₈ (j)) Δτ) (27)
However, the right side in equation (27) is the sum of natural numbers j,
j = 1,..., | Δt / Δτ |
It is. Solving the equation (27) for Q, the remaining hot water amount Q (L) of the bathtub 69 can be obtained by the equation (28).

Q = {Σ (q ₆ (T ₅ (j) −T ₈ (j)) Δτ)} / ΔT (28)
When the remaining hot water amount Q (L) is obtained, the control means 91 adds the remaining hot water amount obtained by subtracting Q (L) from the predetermined hot water amount set by the user by the pouring flow rate sensor 73, and pours water into the bathtub 69. can do.

  As described above, in the configuration in FIG. 4, when hot water of a predetermined temperature is poured into the bathtub 69 from the two directions of the bath return channel 64 and the bath outlet channel 63, the secondary side flow of the bath heat exchanger 26. Since the hot water poured from the bath going flow path 63 side through the path is heated, the tapping water thermistor 17 adjusts the temperature of the finally poured bath water 68 to the temperature set by the user. It is necessary to determine the temperature at which the hot water temperature should be controlled, but when performing bath hot water operation alone, the control means 91 may determine the control temperature in the hot water thermistor 17 based on the equation (21). it can.

In addition, when performing a hot water bath operation while performing a heating operation as an operation using the use-side heat exchanger 24, the temperature detected by the bathing thermistor 82 provided in the bathing flow path 63, and when the device is installed with a flow rate ratio alpha ₁ passing through the bath forward passage 63 which has been learned during the commissioning performed, it can determine the control temperature at tapping thermistor 17 on the basis of the equation (23).

(Embodiment 2)
FIG. 5 is a diagram showing the configuration of the hot water supply apparatus according to the seventh embodiment of the present invention and the flow of hot water and water when performing bath hot water operation alone. The flow of hot water and water is shown in FIG. This is indicated by the arrow inside. 5 corresponds to the case of FIG. 1 and FIG. 4, the branching portion from the hot water supply circulation circuit 2 of the hot water supply passage 3 of the use side heat exchanger 24 formed with a plurality of heat output functions as a single unit. Although shown in the configuration arranged on the downstream side, the effects and operations described in the second embodiment are not affected even if the outlet water passage 3 is branched from the upstream side of the use side heat exchanger 24 in correspondence with the case of FIG. It is the same.

  In the present embodiment shown in FIG. 5, the difference from the hot water supply apparatus of the first embodiment shown in FIG. 1 or 3 is that it passes through the bath heat exchanger 26 from the junction of the pouring channel 61 and the bath circuit 62. In the bath circuit 62 leading to the bath going-out flow path 63, the flow path opening / closing means 84 for opening and closing the flow path is provided, and the other parts having the same configuration and the same function and effect are denoted by the same reference numerals. Detailed explanation will be omitted, and different points will be mainly described.

  In particular, in FIG. 5, the flow path opening / closing means 84 is shown as being provided in the bath circuit 62 from the junction of the pouring flow path 61 and the bath circuit 62 to the entrance of the bath heat exchanger 26. Since the hot water after the heat exchange flows in the bath going flow path 63 downstream of the bath heat exchanger 26, the flow path opening / closing means 84 is provided up to the entrance of the bath heat exchanger 26, thereby opening and closing the flow path. The means 84 is exposed to warm water before heat exchange, and thermal stress can be reduced. Here, the channel opening / closing means 84 has a solenoid valve structure similar to the pouring valve 77, for example.

In the hot water supply apparatus according to the first embodiment, the operation control method during bath hot water operation has been described with reference to FIG. Due to the configuration of the hot water supply apparatus shown in FIG. 1 or FIG. 4, the temperature of the hot water supplied to the bathtub 69 is the temperature of the hot water that passes through the bath return channel 64 and is detected by the bath return thermistor 83, and the bath heat exchanger. The temperature of the hot water detected by the bathing thermistor 82 after passing through the bathing flow path 63 after being heat-exchanged at 26 is mixed.

Therefore, in order to set the temperature of the hot water supplied to the bathtub 69 to a predetermined temperature set by the user, the control means 91 performs the hot water thermistor based on the equation (21) when performing the bath hot water operation alone. When the hot water temperature control of 17 is performed and the heating operation and the hot water bath operation are performed simultaneously, it is necessary to control the hot water temperature of the hot water thermistor 17 based on the equation (23) using α ₁ learned during the trial operation. there were.

In the configuration of the hot water supply apparatus in FIG. 3, when the bath hot water operation is performed independently, the hot water passing through the bath going flow path 63 is the hot water supply that is the primary flow path in the bath heat exchanger 26. Since there is no water flow in the circulation circuit 2, q ₂ = 0 in equation (21), and heat exchange is not performed, so the control temperature T ₃ of the tapping thermistor 17 is the same as the predetermined temperature T ₆ set by the user, that is, T ₃ = T ₆ , however, when the heating operation and the hot water bath operation are performed simultaneously, the water flows into the hot water supply circulation circuit 2 that is the primary flow path of the bath heat exchanger 26 as in the configuration of the hot water supply device in FIG. Therefore, it is necessary to control the hot water temperature of the hot water thermistor 17 based on the equation (23) using α ₁ learned during the trial operation because the hot water passing through the bath going-out flow path 63 is subjected to heat exchange. .

  In the second embodiment, with respect to the hot water temperature control of the hot water thermistor 17 during the bath hot water operation, the hot water on the side passing through the bath going-out flow path 63 is not affected by heat exchange in the bath heat exchanger 26, The control means 91 provides the configuration and operation control of the hot water supply apparatus such that the control temperature of the hot water thermistor 17 becomes a predetermined temperature set by the user.

  In FIG. 5, when performing the bath / hot water operation, the control means 91 first closes the flow path opening / closing means 84 and then performs the bath / hot water operation as described in the first embodiment. At this time, the hot water supplied from the pouring channel 61 to the bath circuit 62 does not pass through the bath heat exchanger 26 and the bath outlet channel 63 because the channel opening / closing means 84 is closed, and the bath return flow. Only from the path 64 is supplied to the bathtub 69.

Therefore, the temperature of the bath water 68 is the same as the temperature of the hot water detected by the hot water thermistor 17, the temperature T ₃ of the hot water to the control means 91 is detected by the hot water thermistor 17 to be controlled, pouring, which are set the predetermined temperature to be can be the same as T _6. However, when the channel opening / closing means 84 is closed, it is not possible to pour water into the bathtub 69 from the bath flow channel 63 side, and therefore, compared to the case where the water is poured from both the bath flow channel 63 and the bath return flow channel 64. Since the amount of water decreases, the hot water bathing time becomes longer.

  When the channel opening / closing means 84 is provided in the configuration of the hot water supply apparatus of FIG. 3, the control means 91 opens the channel opening / closing means 84 and opens the bath opening channel 63 when performing bath hot water operation alone. By pouring from both of the bath return channels 64 and pouring with the channel opening / closing means 84 closed only when heating operation and bath hot water operation are performed simultaneously, the pouring flow rate is increased as much as possible. Perform motion control. When the flow path opening / closing means 84 is provided in the configuration of the hot water supply apparatus of FIG. 1 shown in FIG. 5, it is necessary to close the flow path opening / closing means 84 even when performing the bath hot water operation alone. .

FIG. 6 is a diagram showing the configuration of the hot water supply apparatus in the eighth embodiment of the present invention and the flow of hot water and water when performing bath hot water operation alone. The flow of hot water and water is shown in FIG. This is indicated by the arrow inside. 6 corresponds to the case of the hot water supply apparatus of FIG. 1 or FIG. 4, the use side heat exchange in which the branch portion from the hot water supply circulation circuit 2 of the hot water supply passage 3 is formed as a plurality of heat output functions. Although shown by the structure arrange | positioned in the downstream of the heater 24, even if it branches the hot water supply path 3 from the upstream of the utilization side heat exchanger 24 corresponding to the case of the hot-water supply apparatus of FIG. The effects and actions described in are the same.

  6 differs from the hot water supply apparatus of FIG. 1 or FIG. 3 in that the bath circuit 62 extends from the junction of the pouring channel 61 and the bath circuit 62 to the bath outlet channel 63 through the bath heat exchanger 26. A bath bypass passage 85 for bypassing the bath heat exchanger 26 and a bath circuit passage switching means for switching the passage between the bath heat exchanger 26 and the bath bypass passage 85. 86, the other parts having the same configuration and the same function and effect are denoted by the same reference numerals, detailed description thereof will be omitted, and different points will be mainly described.

  In FIG. 6, the open / closed state of the bath circuit channel switching means 86 is expressed as an open white state, and in this case in FIG. The hot water flowing to the heat exchanger 26 side is in a state of flowing from the bath circuit 62 to the bath outlet channel 63 via the bath bypass channel 85. Here, as the bath circuit flow path switching means 86, a structure in which a flow path is switched by rotating a ball-shaped valve body having a flow path through portion with a stepping motor is conceivable.

  In FIG. 6, when performing bath hot water operation, first, the control means 91 normally flows from the bath circuit 62 to the bath heat exchanger 26 and does not flow to the bath bypass channel 85. The valve body of the switching means 86 is driven to flow through the bath bypass channel 85 as shown in FIG. Then, as described in the first embodiment, the bath / hot water operation is performed.

  At this time, one of the hot water supplied from the pouring channel 61 to the bath circuit 62 passes through the bath circuit 62, the bath bypass channel 85, the bath channel 63, and the bath channel 65 to the bathtub 69. One side passes through the bath return channel 64 and the bath return pipe 66, and the hot water is poured into the bathtub 69 from two directions.

At this time, since the hot water poured from the bath outlet channel 63 side does not pass through the bath heat exchanger 26, the temperature of the bath water 68 is the same as the temperature of the hot water detected by the hot water thermistor 17. temperature T of the hot water to means 91 is detected by the hot water thermistor 17 to control ₃ may be the same predetermined temperature to be poured, which is set to T _6. Furthermore, since it becomes possible to pour hot water into the bathtub 69 from the two directions of the bath going-out flow path 63 and the bath return flow path 64, a sufficient flow rate of pouring water can be secured, and the time of the bath hot water operation is shown in FIG. It can be shortened compared with the structure of the hot-water supply apparatus described in.

As described above, the flow path opening / closing means 84 is provided in the bath circuit 62 in the hot water supply apparatus shown in FIG. 5, or the bath bypass flow path 85 and the bath circuit flow path switching means 86 in the hot water supply apparatus shown in FIG. in the structure provided with, at the time of bath water beam operation, the temperature T ₃ of the hot water to the control unit 91 is detected by the hot water thermistor 17 to be controlled, the predetermined temperature to be poured, which is set T ₆ Can be the same. Furthermore, in the configuration of the hot water supply apparatus of FIG. 6, it is possible to pour hot water into the bathtub 69 from both the bath going-out flow path 63 side and the bath return flow path 64 side, so that a sufficient pouring flow rate can be ensured. .

  In the above embodiment, the control means 91 is mainly composed of a microcomputer and its peripheral circuits, and executes the operation and action described in each example of the first embodiment and each example of the second embodiment. The program is built-in.

As described above, the hot water supply apparatus according to the present invention has a configuration in which the use side heat exchanger is provided in the hot water supply circulation circuit that circulates the hot water heated by the hot water supply heat exchanger, and the heat output of the use side heat exchanger. When providing a plurality of functions, a plurality of secondary-side flow paths of the use-side heat exchanger are connected in parallel to a single hot water supply circulation circuit through which high-temperature hot water that is the primary side flows, and a plurality of uses By forming the side heat exchanger as a single unit, it is possible to reduce the size and weight of the equipment by simplifying the main body configuration, reduce the heat dissipation loss in the use side heat exchanger, and It is possible to improve the efficiency of heat exchange with the road, and it can be applied to a hot water supply apparatus using a gas, electricity, or heat pump as a heat source.

  Further, in the present invention, as a specific configuration in which a plurality of use side heat exchangers are formed as a single unit, in a plate heat exchanger configured by alternately laminating primary side flow paths and secondary side flow paths. The shape of the heat transfer plate that forms the secondary side flow path is provided with a shape having a partition for isolating the secondary side flow path that is each room according to a plurality of heat output functions. Recently, many heat source systems are used widely, and by using a plate heat exchanger like this configuration in the heat source system, the heat source system can be simplified and miniaturized. It can be applied to a use side heat exchanger of a hot water supply apparatus using a heat pump type as a heat source.

Configuration diagram of hot water supply apparatus in Embodiment 1 of the present invention Structure diagram of plate-type heat exchanger in Embodiment 1 of the present invention Structure diagram of primary side heat transfer plate of plate heat exchanger in Embodiment 1 of the present invention Structure diagram of the secondary heat transfer plate of the plate heat exchanger in Embodiment 1 of the present invention Configuration diagram of hot water supply apparatus in Embodiment 1 of the present invention Operation explanatory diagram in Embodiment 1 of the present invention Structure and operation explanatory diagram of a hot water supply apparatus in Embodiment 2 of the present invention Structure and operation explanatory diagram of a hot water supply apparatus in another example of Embodiment 2 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water supply path 2 Hot water supply circulation circuit 3 Hot water supply path 7 Circulation pump 23 Heat exchanger for hot water supply 24 Use side heat exchanger 26 Heat exchanger for bath 61 Hot water flow path 62 Bath circuit 68 Bath water 69 Bath 82 Bathing thermistor 84 Flow Road opening / closing means 85 Bath bypass flow path 86 Bath circuit flow path switching means 107 Partition

Claims (9)

A hot water supply heat exchanger is provided that heats water supplied from the water supply passage and supplies hot water to the hot water supply passage, and forms a hot water supply circulation circuit from the hot water supply heat exchanger to the user side heat exchanger via the circulation pump. Whether to form a hot water supply circuit that branches from the hot water supply circulation circuit to the hot water supply path, and uses either the hot water supply circulation circuit or the hot water supply circuit, or uses the hot water supply circulation circuit and the hot water supply circuit at the same time. When a plurality of heat output functions of the use side heat exchanger are provided, for the single hot water supply circulation circuit through which the high temperature hot water on the primary side supplied from the hot water heat exchanger flows, A hot water supply apparatus in which a plurality of secondary-side flow paths of the usage-side heat exchanger are connected in parallel to form the usage-side heat exchanger having a plurality of heat output functions as a single unit. The hot water supply apparatus according to claim 1, wherein the branch portion from the hot water supply circulation circuit of the hot water supply passage is arranged on the upstream side of the use-side heat exchanger made into a single unit. The hot water supply apparatus according to claim 1, wherein the branch portion from the hot water supply circulation circuit of the hot water supply passage is disposed on the downstream side of the use-side heat exchanger formed as a single unit. Of the multiple heat output functions in the heat exchanger used, the secondary flow path is used as a bath heat exchanger formed as a bath circuit connected to the bathtub, and is branched from the hot water outlet and connected to the bath circuit When a circuit system that realizes a hot water bath operation for supplying a predetermined amount of hot water of a predetermined temperature to the bathtub from the supplied pouring channel is supplied to the bathtub through the bath heat exchanger in the bath circuit A bathing thermistor is provided for detecting the temperature of the hot water, and during the hot water operation of the bath, operation control for determining the temperature of the hot water to be supplied to the pouring channel for setting the temperature of the bath water to a predetermined temperature is performed. Control means to perform, one side being supplied with the hot water supplied from the pouring channel to the bath as it is, and the other side after passing the hot water supplied from the pouring channel through the bath heat exchanger to the bath The pouring operation is performed from two directions. Water heater claim wherein. Of the multiple heat output functions in the heat exchanger used, the secondary flow path is used as a bath heat exchanger formed as a bath circuit connected to the bathtub, and is branched from the hot water outlet and connected to the bath circuit In the case of configuring a circuit system that realizes a bath hot water operation that supplies a predetermined amount of hot water of a predetermined temperature from the pouring channel into the bath, a channel opening / closing means is provided in the bath circuit, and during the bath hot water operation Any one of claims 1 to 3, wherein the flow channel opening / closing means is closed and the hot water supplied from the pouring flow channel is directly poured into the bathtub from one direction without passing through the bath heat exchanger. A hot water supply apparatus according to claim 1. Of the multiple heat output functions in the heat exchanger used, the secondary flow path is used as a bath heat exchanger formed as a bath circuit connected to the bathtub, and is branched from the hot water outlet and connected to the bath circuit Bath bypass flow path for bypassing the heat exchanger for bath in the bath circuit when configuring a circuit system for realizing a hot water bath operation for supplying a predetermined amount of hot water of a predetermined temperature from the poured water flow path to the bathtub And a bath circuit channel switching means for switching the channel whether to pass through the bath heat exchanger or the bath bypass channel, and during the bath hot water operation, the bath circuit channel One of the hot water supplied from the pouring channel is passed through the bath bypass channel where the hot water supplied from the pouring channel is switched to the bathtub, and the other is the hot water supplied from the pouring channel as it is. Invoicing from two directions to the bathtub Water heater according to any one of 1 to 3. There is a single-unit use-side heat exchanger having a plurality of heat output functions, and a plate-type heat exchanger configured by alternately stacking primary-side flow paths and secondary-side flow paths is used. The heat transfer plate forming the secondary flow path is a plate heat exchanger having a partition for isolating the secondary flow path according to a plurality of heat output functions. The partition is configured so that when the hot water at a predetermined temperature and a predetermined flow rate flows into the primary channel, the rated heat output obtained in each secondary channel can be obtained according to the purpose of the heat output function. The plate heat exchanger according to claim 7, further comprising a heat transfer plate formed at a location where the heat transfer area is optimized. The utilization side heat exchanger according to any one of claims 1 to 6 is a hot water supply device using the plate heat exchanger according to claim 7 or 8.