JP2007292446A - Control method for heat using device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control method for a heat using device, which performs control of hot water temperature to be supplied based on an operating state. <P>SOLUTION: In the control method for the heat using device 5 constituted by combining a heat source 1, a hot water storage tank unit U including a hot water storage tank 2 and a hot water storage tank control part 3, and a water heater 4, in which the water heater 4 can perform each operation of bath hot water filling operation, additional hot water supply operation and bath automatic operation while separating hot water supply use and bath water use, a hot water storage tank control part 3 acquires setting information for set temperatures of hot water and ON/OFF of the bath hot water filling operation, the additional hot water supply operation and the bath automatic operation, which are set by a user, performs adjustment of the temperature of hot water to be supplied from the hot water storage tank 2 and heating/heating prohibition by an auxiliary heat source, whereby the temperature of hot water to be supplied to the user is controlled. When hot water in the hot water storage tank is supplied in the ON state of bath hot water filling operation or additional hot water operation, the control part 3 instructs prohibition of heating by the auxiliary heat source and controls the hot water temperature to be supplied to the user to a set temperature for bath use. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for controlling a heat utilization apparatus using a fuel cell, a gas engine, or the like as a heat source.

  In recent years, heat utilization devices that use exhaust heat generated by heat sources such as fuel cells and gas engines have been used in homes (see, for example, Patent Document 1 and Patent Document 2). A conventional heat utilization apparatus will be described with reference to FIG.

  The heat utilization device shown in FIG. 6 is a so-called cogeneration system, and the heat source 1 is a power generation means such as a fuel cell, and generates hot water by exhaust heat generated from the heat source when power is generated. The generated high-temperature hot water is stored in a hot water tank 2 that stores the heat generated by the heat source as hot water, and is supplied from the hot water tank 2 as hot water in a kitchen or hot water of a bath, for example. A water supply path 72 from a water source 71 such as a water supply is connected to the hot water storage tank 2 via a pressure reducing valve 73 so that a reduced amount of water used can be supplied. A bypass pipe 25 is branched from the middle of the water supply path 72, and the bypass pipe 25 is connected to a mixing valve 24 provided in the middle of a hot water discharge pipe 23 for discharging hot water from the hot water storage tank 2. The hot water temperature supplied to the user is adjusted by adjusting the mixing ratio. Further, the hot water discharge pipe 23 is connected to an auxiliary heat source 4 ′ such as a boiler, and can be heated when the hot water temperature discharged from the hot water storage tank 2 does not reach a predetermined temperature. In FIG. 6, reference numeral 42 is a hot water outlet pipe, 43 a is a bath reheating pipe, 43 b is a bath retreating return pipe, and 21 and 22 are outward and return pipes from the hot water tank 2 to the heat source 1. , U denotes a hot water tank unit including the hot water tank 2 and the auxiliary heat source 4 ', and 6 denotes a setting terminal for performing various settings.

  In such a heat utilization device, since it is a single system as a whole, it is usually introduced as a whole systematized when introducing it. In this case, an existing hot water supply device is installed. Even so, the heat source such as the boiler becomes unnecessary, and the initial cost becomes high if an entire system is introduced. Therefore, when a hot water supply device is originally used alone, a heat utilization device has been considered which is incorporated into a system as an auxiliary heat source. Here, a single water heater will be described with reference to FIG.

  The single hot water supply device 4 includes a heating means (not shown) for the burner and is connected to a water supply pipe 72. The water supplied from the water supply pipe 72 is heated by the heating means to be a hot water discharge pipe (described later). Hot water is supplied from a hot water supply outlet 42 and a bath retreating pipe 43a). The heated hot water is used for hot water supply except when used as hot water for baths, and when used as hot water for hot water, it is used as hot water for baths, additional hot water, etc. The hot water is discharged from the hot water outlet pipe 42 and the outgoing pipe 43a for bathing. In addition, the hot water supply device 4 can set a preset temperature for hot water use and a set temperature for hot water use, respectively, and this setting can be made from a setting terminal 6 ', which is a remote control by the user. This setting information is acquired by the hot water supply control unit 41 of the hot water supply apparatus 4 from the setting terminal 6 ′, and control according to the setting is performed.

  As described above, the hot water supply pipe for hot water use and bath use is different from the hot water supply pipe 42 and the forward pipe 43a for bathing hot water. 41, and the hot water temperature is controlled so as to be the set temperature for each use.

  Further, in the hot water supply device 4, operations such as bath hot water operation, additional hot water operation, automatic bath operation in which hot water and hot water are automatically performed, and the like can be performed.

  When such a single hot water supply apparatus is incorporated into the system, the single hot water supply apparatus is provided in a hot water storage tank unit that includes a heat source, a hot water storage tank, and a hot water storage tank control section that controls the entire heat utilization apparatus as the system. In combination, the hot water pipe from the hot water storage tank is connected to the input side of the hot water supply apparatus, and the hot water from the hot water storage tank is discharged to each hot water discharge pipe through the hot water supply apparatus. The setting information from the setting terminal is acquired by the hot water storage tank control unit of the entire system, and adjusts the temperature of the hot water discharged from the hot water storage tank and controls the heating by the hot water supply device as an auxiliary heat source.

By the way, in the heat utilization apparatus in which the single hot water supply apparatus as described above is incorporated in the system, the hot water discharge operation is performed, and the hot water is discharged from either the hot water supply pipe for hot water supply of the hot water supply apparatus or the forward pipe for bathing. Even if the hot water is stored, the hot water tank control unit only recognizes the hot water from the hot water tank to the hot water supply device, and does not recognize whether the hot water is used or used. For this reason, the hot water tank control unit directly determines whether the hot water temperature to be supplied is set to the set temperature for hot water use or the set temperature for bath use when supplying hot water from the hot water tank to the user. I can't. Therefore, mix more water than necessary to the hot water discharged from the hot water tank, supply it to the hot water supply device with the temperature lowered sufficiently, and heat the hot water to the set temperature according to the operating condition determined by the hot water supply device. Although it is conceivable to control the temperature, in this case, since the hot water in the hot water tank cannot be used effectively, there is a problem that the energy saving property is remarkably impaired.
JP 2004-347196 A JP-A-2005-55033

  The present invention has been made in view of the above points, and the object of the present invention is to provide a heat source, a hot water storage hot water storage tank for storing heat generated by the heat source as hot water, and a hot water storage tank serving as a control unit for the entire heat utilization device. A hot water storage tank unit provided with a control unit and a hot water supply device as an auxiliary heat source different from the hot water storage tank unit are combined to constitute a heat utilization device, and the hot water supply device can be used separately for hot water utilization and bath utilization. In addition, the bath can be operated automatically, with bath bathing operation, additional bath operation, bath bath bathing and bath water level keeping the bath water level constant, and bath water bathing automatically. Of the hot water temperature when using the hot water supply input from the terminal, the hot water temperature setting temperature when using the bath, ON / OFF of hot water bath operation, ON / OFF of additional hot water operation, ON / OFF of automatic bath operation Setting information storage system In the heat utilization device that controls the hot water temperature that is supplied to the user by adjusting the temperature of the hot water discharged from the hot water tank and controlling the heating / heating prohibition by the auxiliary heat source. By controlling the hot water temperature, it is to provide a control method capable of obtaining hot water having an optimum hot water temperature while realizing energy saving by effectively using hot water storage and suppressing unnecessary combustion of an auxiliary heat source. .

  In order to solve the above problems, the invention according to claim 1 will be described with reference to FIG. 1. A heat source 1, a hot water storage tank 2 for storing heat generated by the heat source as hot water, and a controller for the heat utilization apparatus 5 as a whole. A hot water storage tank unit U provided with a hot water storage tank control unit 3 and a hot water supply device 4 as an auxiliary heat source different from the hot water storage tank unit U are combined to constitute a heat utilization device 5, and the hot water supply device 4 is a hot water supply. Each of the bath automatic operation that makes it possible to use the bath and bath use separately, and bath bath filling operation, addition bath operation, bath bath filling and bath water level are kept constant, and addition bath and bath temperature are kept constant Operation is possible, and the temperature of the hot water when using the hot water supply input by the user from the setting terminal 6, the temperature of the hot water when using the bath, ON / OFF of the hot water bath operation, ON / OFF of the additional hot water operation OFF, automatic bath operation ON / OF The hot water storage tank control unit 3 acquires the setting information of the hot water tank, and the hot water storage tank control unit 3 adjusts the temperature of the hot water discharged from the hot water storage tank 2 and controls the heating / heating prohibition by the auxiliary heat source and supplies it to the user. This is a control method in the heat utilization device that controls the hot water temperature, and when the hot water in the hot water tank is discharged while the bath hot water filling operation or the additional hot water operation is ON, the hot water tank control unit 3 prohibits the heating by the auxiliary heat source. The hot water supply device 4 is instructed and controlled so that the hot water temperature supplied to the user becomes the set temperature when using the bath.

  According to such a method, the hot water storage tank control unit 3 that cannot recognize whether the hot water is discharged from the hot water supply pipe 42 of the hot water supply device 4 or the hot water outlet pipe 43a is supplied based on the operation state. It is possible to control the temperature of the hot water to be used, and even without acquiring information on whether to use hot water or bath, the user can obtain the desired hot water (that is, the set temperature when using the hot water or the set temperature when using the bath). It is not necessary to provide a configuration for transferring information on whether to use hot water or bath from the hot water supply device 4 to the hot water tank control unit 3 at this time, so that the equipment cost can be reduced. Can be achieved.

  The invention according to claim 2 will be described with reference to FIG. 1. A hot water storage tank 2 that stores heat generated by the heat source 1, heat generated by the heat source as hot water, and a hot water tank control unit 3 that serves as a control unit for the heat utilization apparatus 5 as a whole. And a hot water supply device 4 as an auxiliary heat source different from the hot water storage tank unit U to form a heat utilization device 5, and the hot water supply device 4 uses hot water and bath. It can be used properly, and can be used for bath hot water operation, additional hot water operation, bath hot water bath and bath water level at a constant level, and additional bath water and automatic bath operation that keeps the bath temperature at a constant level. Set by the person using the setting terminal 6 when using the hot water supply, setting temperature of the hot water when using the bath, ON / OFF of the hot water bath operation, ON / OFF of the additional hot water operation, automatic bath operation ON / OFF setting information Heat that is obtained by the control unit 3 and that controls the temperature of hot water supplied to the user by adjusting the temperature of the hot water discharged from the hot water tank 2 and controlling heating / heating prohibited by the auxiliary heat source. When the hot water in the hot water storage tank is discharged within a certain time after the hot water bathing operation, the additional hot water operation, or the automatic bath operation is turned on, the hot water tank control unit 3 is heated by the auxiliary heat source. The hot water supply device 3 is instructed to be prohibited, and the hot water temperature supplied to the user is controlled so as to become the set temperature when using the bath.

  According to such a method, the hot water storage tank control unit 3 that cannot recognize whether the hot water is discharged from the hot water supply pipe 42 of the hot water supply device 4 or the hot water outlet pipe 43a is supplied based on the operation state. The hot water temperature can be controlled, and the user can supply the hot water desired by the user without acquiring information on whether to use the hot water supply or the bath. Since there is no need to provide the hot water tank control unit 3 with a configuration for transmitting / receiving information on whether to use hot water or to use a bath, the facility cost can be reduced.

  The invention according to claim 3 will be described with reference to FIG. 1. A hot water storage tank 2 that stores heat generated by the heat source 1, the heat generated by the heat source as hot water, and a hot water tank control unit 3 that serves as a control unit for the entire heat utilization device 5. And a hot water supply device 4 as an auxiliary heat source different from the hot water storage tank unit U to form a heat utilization device 5, and the hot water supply device 4 uses hot water and bath. It can be used properly, and can be used for bath hot water operation, additional hot water operation, bath hot water bath and bath water level at a constant level, and additional bath water and automatic bath operation that keeps the bath temperature at a constant level. Set by the person using the setting terminal 6 when using the hot water supply, setting temperature of the hot water when using the bath, ON / OFF of the hot water bath operation, ON / OFF of the additional hot water operation, automatic bath operation ON / OFF setting information Heat that is obtained by the control unit 3 and that controls the temperature of hot water supplied to the user by adjusting the temperature of the hot water discharged from the hot water tank 2 and controlling heating / heating prohibited by the auxiliary heat source. When the hot water in the hot water tank is discharged while the hot water bathing operation, the additional hot water operation, and the automatic bath operation are OFF, the hot water tank control unit 3 prohibits heating by the auxiliary heat source. In addition to instructing the apparatus 4, the hot water temperature supplied to the user is controlled so as to become the set temperature when using the hot water supply.

  According to such a method, the hot water storage tank control unit 3 that cannot recognize whether the hot water is discharged from the hot water supply pipe 42 of the hot water supply device 4 or the hot water outlet pipe 43a is supplied based on the operation state. The hot water temperature can be controlled, and the user can supply the hot water desired by the user without acquiring information on whether to use the hot water supply or the bath. Since there is no need to provide the hot water tank control unit 3 with a configuration for transmitting / receiving information on whether to use hot water or to use a bath, the facility cost can be reduced.

  The invention according to claim 4 will be described with reference to FIG. 1. A heat source 1, a hot water tank 2 that stores heat generated by the heat source as hot water, and a hot water tank control unit 3 that serves as a control unit for the entire heat utilization device 5. And a hot water supply device 4 as an auxiliary heat source different from the hot water storage tank unit U to form a heat utilization device 5, and the hot water supply device 4 uses hot water and bath. It can be used properly, and can be used for bath hot water operation, additional hot water operation, bath hot water bath and bath water level at a constant level, and additional bath water and automatic bath operation that keeps the bath temperature at a constant level. Set by the person using the setting terminal 6 when using the hot water supply, setting temperature of the hot water when using the bath, ON / OFF of the hot water bath operation, ON / OFF of the additional hot water operation, automatic bath operation ON / OFF setting information Heat that is obtained by the control unit 3 and that controls the temperature of hot water supplied to the user by adjusting the temperature of the hot water discharged from the hot water tank 2 and controlling heating / heating prohibited by the auxiliary heat source. When the hot water in the hot water tank is discharged while the automatic bath operation is ON, the hot water tank control unit 3 instructs the hot water supply device 4 to prohibit heating by the auxiliary heat source and supplies it to the user. The hot water temperature to be controlled is controlled to be the lower one of the set temperature when using hot water and the set temperature when using bath.

  When the hot water in the hot water storage tank 2 is discharged while the automatic bath operation is on, the automatic bath operation is generally turned on for a long time. As the lower temperature of the set temperature when using the bath and the set temperature when using hot water, the lower temperature is desired when the hot water is discharged. It is possible to avoid accidents such as burns that may occur by discharging hot water.

  Further, the invention according to claim 5 will be described with reference to FIG. 1. The heat source 1, the hot water storage tank 2 for storing the heat generated by the heat source as hot water, and the hot water tank control unit 3 serving as a control unit for the heat utilization apparatus 5 as a whole. And a hot water supply device 4 as an auxiliary heat source different from the hot water storage tank unit U to form a heat utilization device 5, and the hot water supply device 4 uses hot water and bath. It can be used properly, and can be used for bath hot water operation, additional hot water operation, bath hot water bath and bath water level at a constant level, and additional bath water and automatic bath operation that keeps the bath temperature at a constant level. Set by the person using the setting terminal 6 when using the hot water supply, setting temperature of the hot water when using the bath, ON / OFF of the hot water bath operation, ON / OFF of the additional hot water operation, automatic bath operation ON / OFF setting information Heat that is obtained by the control unit 3 and that controls the temperature of hot water supplied to the user by adjusting the temperature of the hot water discharged from the hot water tank 2 and controlling heating / heating prohibited by the auxiliary heat source. When the hot water in the hot water storage tank is discharged while the automatic bath operation is ON, the hot water storage tank control unit 3 first instructs the hot water supply apparatus 4 to prohibit the heating by the auxiliary heat source and uses the hot water supply device 4. The hot water temperature supplied to the person is controlled to be the lower one of the set temperature when using hot water and the set temperature when using bath, and then whether the hot water supply or bath is used from the hot water supply device 4 The hot water temperature is controlled to obtain the set temperature at the time of use.

  When the hot water in the hot water storage tank 2 is discharged while the automatic bath operation is on, the automatic bath operation is generally turned on for a long time. As the lower temperature of the set temperature when using the bath and the set temperature when using hot water, the lower temperature is desired when the hot water is discharged. Accidents such as burns that may occur by discharging hot water can be avoided, and then information on whether to use hot water or bath is obtained from the hot water supply device 4 and used reliably. Hot water at the temperature desired by the person can be supplied.

  The invention according to claim 6 will be described with reference to FIG. 2. The heat source 1, the hot water storage tank 2 that stores the heat generated by the heat source as hot water, and the hot water tank control unit 3 that serves as a control unit for the heat utilization apparatus 5 as a whole. And a hot water supply device 4 as an auxiliary heat source different from the hot water storage tank unit U to form a heat utilization device 5, and the hot water supply device 4 uses hot water and bath. It can be used properly, and can be used for bath hot water operation, additional hot water operation, bath hot water bath and bath water level at a constant level, and additional bath water and automatic bath operation that keeps the bath temperature at a constant level. Set by the person using the setting terminal 6 when using the hot water supply, setting temperature of the hot water when using the bath, ON / OFF of the hot water bath operation, ON / OFF of the additional hot water operation, automatic bath operation ON / OFF setting information Heat that is obtained by the control unit 3 and that controls the temperature of hot water supplied to the user by adjusting the temperature of the hot water discharged from the hot water tank 2 and controlling heating / heating prohibited by the auxiliary heat source. When the hot water in the hot water storage tank is discharged while the automatic bath operation is ON, the hot water storage tank control unit 3 first instructs the hot water supply apparatus 4 to prohibit the heating by the auxiliary heat source and uses the hot water supply device 4. The hot water temperature supplied to the person is controlled to be the lower of the set temperature when using hot water and the set temperature when using bath, and then the hot water supply pipe 42 and the hot water for the hot water supply device 4 are reheated. The measurement information of the flow meter 44 provided in one or both of the forward pipes 43a is obtained, and it is determined whether the hot water use or the bath use is used from the measurement information, and the set temperature at the time of use is determined. It is characterized by controlling the hot water temperature

  When the hot water in the hot water storage tank 2 is discharged while the automatic bath operation is on, the automatic bath operation is generally turned on for a long time. As the lower temperature of the set temperature when using the bath and the set temperature when using hot water, the lower temperature is desired when the hot water is discharged. Accidents such as burns that may occur by discharging hot water can be avoided, and then the measured value of the flow meter 44 can be obtained to reliably supply hot water at the temperature desired by the user. Can do.

  The invention according to claim 7 is the invention according to claims 1 to 6, wherein either or both of a temperature of hot water supplied to the hot water supply device and a temperature of hot water supplied to the user from the hot water supply device are provided. When the hot water in the hot water storage tank is discharged, when either or both of the detected temperatures are lower than the hot water temperature that is the control target of the heat utilization device, the detected temperature from the start of the hot water. The temperature difference between the control temperature and the target temperature, a predetermined time based on the tapping flow rate, the control target temperature set higher by the temperature difference between the detected temperature and the control target temperature, and a predetermined temperature based on the tapping flow rate Thus, the control is performed.

  By setting it as such a structure, time (rise time) until hot water temperature turns into control target temperature from the start of a hot water can be shortened.

  The invention according to claim 8 is the invention according to claims 1 to 6, wherein either or both of a temperature of hot water supplied to the hot water supply device and a temperature of hot water supplied to the user from the hot water supply device are provided. When the hot water in the hot water storage tank is discharged, when either or both of the detected temperatures are lower than the hot water temperature that is the control target of the heat utilization device, the detected temperature from the start of the hot water. And a temperature difference between the control target temperature and the hot water flow rate, the hot water supply device is allowed to be heated by the auxiliary heat source for a predetermined time.

  By setting it as such a structure, time (rise time) until hot water temperature turns into control target temperature from the start of a hot water can be shortened.

  In the present invention, the existing hot water supply apparatus can be used as an auxiliary heat source without impairing energy saving and usability, and the equipment can be used effectively and the equipment cost can be reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. The heat utilization device 5 is a so-called cogeneration system. In the present invention, the heat source 1, the hot water tank unit U, and the auxiliary heat source including the hot water supply device 4 different from the hot water tank unit U are mainly configured.

  The hot water storage tank unit U includes a hot water storage tank 2 (hereinafter simply referred to as “hot water storage tank 2”) that stores heat generated by a heat source as hot water, and a hot water storage tank control unit 3. In this embodiment, the fuel cell serves as the heat source 1, and the exhaust heat from the heat source 1 is used as the heat source. The heat source 1 is not particularly limited to a fuel cell, but may be another one such as a gas engine, and a heat generating part utilizing solar heat can also be used.

  The hot water storage tank 2 is connected with an outgoing pipe 21 to a heat exchanger (not shown) for recovering heat from the heat source 1 and a return pipe 22 from the heat exchanger, and the low temperature flowing through the outgoing pipe 21 is connected. The hot water is heated by the heat exchanger, becomes hot hot water, flows through the return pipe 22, and is returned to the hot water tank 2. The hot water tank 2 is connected to a water supply path 72 for supplying water from a water source 71 such as a water supply, and water can be supplied through a pressure reducing valve 73 provided in the middle. The hot water storage tank 2 is connected to a hot water discharge pipe 23 for discharging the hot water inside, and the other end of the hot water discharge pipe 23 is connected to a hot water supply device to be described later. A mixing valve 24 is provided in the middle of the hot water pipe 23, and a bypass pipe 25 branched from the middle of the water supply path 72 is connected to the mixing valve 24, and the hot water from the hot water tank 2 and the bypass pipe 25 are connected. It is possible to control the temperature of the hot water supplied by appropriately mixing the water flowing through the water.

  The hot water storage tank control unit 3 controls the heat utilization apparatus 5 as a whole, such as controlling the mixing amount of the mixing valve 24, instructing the hot water supply control unit 41 of the hot water supply apparatus 4 to be described later, and obtaining information on the setting terminal 6. Is what you do.

  Although not shown, the hot water supply apparatus 4 includes a heating means such as a burner and a heat exchanger heated by the heating means, and a hot water discharge pipe 23 from the hot water tank 2 is provided on the input side of the medium to be heated of the heat exchanger. Is connected, and a hot water outlet pipe of the hot water supply device 4 is connected to the output side. The hot water supply pipe of the hot water supply device 4 is branched into a hot water supply hot water discharge pipe 42 and a bath reheating pipe 43a. Further, in recent hot water supply devices, in order to shorten the bath hot water filling time, the bath retreating pipe 43a is branched to the bath retreating return pipe 43b via an electric valve (not shown) to retreat the bath. Although the mainstream uses both the return pipe 43a and the return pipe 43b for bathing, in order to simplify the explanation here, only the forward pipe 43a for bathing is used for bathing. explain. In the following description, when it is simply referred to as a tapping pipe, it means one or both of the tapping pipe 42 for hot water supply and the forward pipe 43a for bathing. An electric valve (not shown) is provided in the forward pipe 43a for bathing, and the hot water supply control unit 41 can automatically control hot water supply and stoppage to the forward pipe 43a for bathing. .

  In this hot water supply device 4, when a user performs a hot water discharge operation with the curan or the like connected to the hot water supply pipe 42 opened, the hot water is discharged from the hot water supply pipe 42 for hot water use, When performing a hot water supply operation for hot water filling, etc., the hot water is discharged from the forward pipe 43a for bathing and discharged into the bathtub as a bath use, and both hot water use and bath use can be used properly. Yes. Furthermore, a return pipe 43b for replenishing the hot water in the bathtub is provided for returning the hot water in the bathtub to the hot water supply device 4. Can be discharged into the bathtub.

  In addition, the heat utilization device 5 is provided with a setting terminal 6 on which the user performs various settings. Although not shown, the setting terminal 6 includes an input unit for a user to input settings. The setting information input from the input unit is stored in an internal memory, and is connected to the hot water tank control unit 3 by wire or wirelessly. To be acquired. Setting items include hot water temperature for hot water supply, hot water temperature for bath use, ON / OFF of operation (bath hot water operation, additional hot water operation, automatic bath operation) described later, and there are other setting items. The description is omitted here. These operations are controlled entirely by the hot water tank control unit 3, and each operation is controlled by instructing the hot water supply control unit 41. The instruction from the hot water tank control unit 3 to the hot water supply control unit 41 is performed by the communication means originally provided, for example, the communication means between the hot water supply device 4 and the setting terminal 6 ′ connected to the hot water supply device 4. . Although not specifically illustrated, in the heat utilization device 5, the temperature of the water in the water supply channel 72, the temperature in the hot water storage tank 2, the temperature of the water in the outgoing pipe 21, the temperature of the hot water discharged from the hot water storage tank 2, There are provided temperature sensors for measuring the temperature of hot water downstream of the mixing valve 24 of the hot water pipe 2 of the hot water tank 2 and the temperature of hot water in the hot water pipe 23 from the hot water supply device 4, and these measured values are stored in the hot water tank. Acquired by the control unit 3. Hereinafter, each operation will be described.

  The bath water filling operation is input from the input unit of the setting terminal 6 by the user. The input from the setting terminal 6 has different buttons and switches for each operation and for each setting item, and the corresponding buttons and switches may be operated. The method (the number of times of pressing, the pressing time, the pressing interval, etc.) may be different, or may be other methods, and is not particularly limited. When the bath hot water filling operation is started, a predetermined amount (for example, 100 to 400 liters) of hot water is adjusted to the bath set temperature and discharged into the bathtub, and the hot water filling ends.

  In addition water operation, when the user inputs from the setting terminal 6, a predetermined amount (for example, about 10 liters or 20 liters) of hot water is adjusted to the bath set temperature and discharged into the bathtub, and the addition water ends. .

  In the bath automatic operation, when the user inputs from the setting terminal 6, the hot water filling to the bath is started, and a predetermined amount of hot water adjusted to the bath set temperature is supplied to the bath from the forward pipe 43a for bathing. Is done. When the hot water filling is finished, when the temperature of the hot water falls, the reheating is automatically performed until the bath setting temperature is reached, and when the amount of hot water is reduced, the hot water is supplied again as a bath. Is performed automatically. The amount of hot water is measured by hot water measuring means (not shown) and acquired by the hot water tank control unit 3. In addition, the measurement of the amount of hot water by the hot water measuring means is measured when the water level is higher than the circulation adapter which is a hot water outlet provided on the bathtub wall, although not shown, and the water level from the circulation adapter is measured. If is below, it is not measured.

  Note that the user can set the amount of hot water discharged in the bath hot water operation and the amount of hot water discharged in the additional hot water operation.

  In the first embodiment of the present invention, when the hot water in the hot water tank 2 is discharged while the hot water bathing operation or the additional hot water operation is ON, the hot water tank control unit 3 prohibits heating by the auxiliary heat source. In addition to instructing the hot water supply control unit 41, the mixing valve 24 is adjusted and controlled so that the temperature of hot water supplied to the user becomes a set temperature when using the bath. When the hot water operation is performed, the hot water is discharged from the hot water supply pipe 42 or the hot water outlet pipe 43a of the hot water supply device 4 and discharged from the hot water storage tank 2, but the hot water storage tank control unit 3 supplies hot water. It is not possible to recognize directly whether to use or bath. In the case where the hot water in the hot water storage tank 2 is discharged while the hot water bathing operation or the additional hot water operation is ON, there is a high possibility that the hot water is used in the bath.

  Thus, by using the existing hot water supply device 4 and configuring the heat utilization device 5 as a cogeneration system, the heating means of the existing hot water supply device 4 can be used as an auxiliary heat source and the hot water supply control unit 41 can use it. In each of the above operations, the hot water storage tank control unit 3 cannot recognize whether the hot water is discharged from the hot water discharge pipe 42 of the hot water supply device 4 or the hot water discharge pipe 43a. It is possible to control the temperature of the hot water supplied to the hot water, and to obtain the desired hot water (that is, the set temperature when using the hot water supply or the setting when using the bath) without obtaining information on whether the hot water is used or using the bath. In this case, the hot water supply control unit 41 is provided with a configuration for transmitting / receiving information on whether to use the hot water supply or the bath to the hot water tank control unit 3. Because there is no need, it is possible to achieve a reduction of equipment costs.

  Further, in the second embodiment of the present invention, when the hot water in the hot water tank 2 is discharged within a certain time after the hot water bathing operation, the automatic bath operation or the additional hot water operation is turned on, the hot water tank control unit 3 Instructs the hot water supply control unit 41 to prohibit heating by the auxiliary heat source and controls the hot water temperature supplied to the user to be the set temperature of the hot water temperature when using the bath. Even in this case (and the following embodiments), the hot water storage tank control unit 3 cannot directly recognize whether the hot water supply is used or the bath is used even if a hot water discharge operation is performed. When the hot water in the hot water storage tank 2 is discharged within a certain period of time after the bath hot water operation, automatic bath operation or additional hot water operation is turned on, it is highly possible that the bath is being used. Set temperature.

  Thereby, the hot water temperature to be supplied can be controlled based on the operation state, and the hot water desired by the user can be supplied almost without obtaining information on whether to use the hot water supply or the bath. Therefore, since it is not necessary to provide a configuration for transferring information on whether to use hot water or bath from the hot water supply control unit 41 to the hot water storage tank control unit 3, the equipment cost can be reduced.

  Further, in the third embodiment of the present invention, when the hot water in the hot water tank 2 is discharged while the hot water bathing operation, the automatic bath operation, and the additional hot water operation are OFF, the hot water tank control unit 3 uses the auxiliary heat source. The hot water control unit 41 is instructed to prohibit heating, and the hot water temperature supplied to the user is controlled to be the set temperature of the hot water temperature when using hot water. When the hot water in the hot water storage tank 2 is discharged with the bath hot water operation, the automatic bath operation, and the additional hot water operation turned off, there is a high possibility that the hot water is used. To do.

  Thereby, the hot water temperature to be supplied can be controlled based on the operation state, and the hot water desired by the user can be supplied almost without obtaining information on whether to use the hot water supply or the bath. Therefore, since it is not necessary to provide a configuration for transferring information on whether to use hot water or bath from the hot water supply control unit 41 to the hot water storage tank control unit 3, the equipment cost can be reduced.

  Further, in the fourth embodiment of the present invention, when the hot water in the hot water tank 2 is discharged while the automatic bath operation is ON, the hot water tank control unit 3 instructs the hot water supply control unit 41 to prohibit heating by the auxiliary heat source. At the same time, the temperature of the hot water supplied to the user is controlled to be the lower one of the set temperature of the hot water when using the hot water and the set temperature of the hot water when using the bath. When the hot water in the hot water tank 2 is discharged while the automatic bath operation is ON, the automatic bath operation is generally ON for a long time (for example, the bathing of the last bather from the time when the first bather takes a bath). During this time, there is no significant difference (3: 7 to 7: 3) in whether the hot water used during this time is bath use or hot water use. As the lower temperature of the set temperature when using hot water, the lower temperature is desired when the hot water is discharged, and there is a risk of burns occurring by discharging hot water. Accidents such as can be avoided.

  In the fifth embodiment of the present invention, when the hot water in the hot water tank 2 is discharged while the automatic bath operation is ON, the hot water tank control unit 3 first prohibits heating by the auxiliary heat source. The hot water temperature supplied to the user is controlled to be a lower temperature between the set temperature of the hot water temperature when using the hot water supply and the set temperature of the hot water temperature when using the bath, and then the hot water supply control unit 41. Information on whether to use hot water or bath is obtained from the control, and control is performed so that the hot water temperature is set at the time of use. When the hot water in the hot water tank 2 is discharged while the automatic bath operation is ON, the lower one of the set temperature when using the bath and the set temperature when using the hot water supply is first used as in the fourth embodiment. As a hot water outlet, you can avoid accidents such as burns that might occur by discharging hot water when you want the lower temperature when you discharge as the higher temperature, Thereafter, information on whether hot water use or bath use is obtained from the hot water supply control unit 41, and hot water at a temperature desired by the user can be reliably supplied.

  In addition, in the sixth embodiment of the present invention shown in FIG. 2, when the hot water in the hot water tank 2 is discharged while the automatic bath operation is ON, the hot water tank control unit 3 first prohibits heating by the auxiliary heat source. And the hot water temperature supplied to the user is controlled to be the lower one of the set temperature of the hot water temperature when using the hot water supply and the set temperature of the hot water temperature when using the bath, The measurement value information of the flow meter 44 provided in one or both of the hot water supply pipe 42 and the bath follow-up pipe 43a of the hot water supply device 4 is acquired, and either hot water use or bath use is acquired from the measurement value information. Is used, and control is performed so that the hot water temperature at the time of use becomes a set temperature. In the present embodiment, as shown in the figure, a flow meter 44 is provided in the hot water outlet pipe 42, and the measured value of the flow meter 44 is acquired by the hot water tank control unit 3, and the hot water tank control unit 3 uses hot water. Or the use of a bath.

  When the hot water in the hot water storage tank 2 is discharged while the automatic bath operation is ON, the set temperature when using the bath and the set temperature when using the hot water supply are initially set in the same manner as in the fourth and fifth embodiments. By tapping out the hot water as the lower temperature, we want the lower temperature when the hot water is tapped out, and can cause accidents such as burns that can occur by discharging hot water. After that, the measured value of the flow meter 44 can be obtained, and hot water at a temperature desired by the user can be reliably supplied.

  Next, a seventh embodiment of the present invention will be described. In the present embodiment, in any of the first to sixth embodiments, the temperature of the hot water supplied from the hot water storage tank 2 to the hot water supply device 4 and the hot water supply device 4 to the user are supplied. Temperature detecting means 8 for detecting either or both of the hot water temperatures to be discharged, and when discharging hot water from the hot water storage tank 2, either or both of the detected temperatures are the hot water temperature that the heat utilization device 5 controls. When the temperature is lower than the predetermined temperature difference or lower than the predetermined temperature difference, the control target and the control target for a predetermined time in accordance with the temperature difference between the detected temperature and the temperature to be controlled and the discharge flow rate from the start of the hot water. The temperature to be controlled is set to be higher than normal by a predetermined temperature that is determined in advance by the temperature difference between the detected temperature and the control target temperature, and the tapping flow rate. In the present embodiment, as shown in FIG. 3, as the temperature detection means 8, a temperature detection means 81 provided in the hot water discharge pipe 23 for detecting the temperature of hot water supplied from the hot water tank 2 to the hot water supply apparatus 4, and a hot water supply apparatus The temperature detection means 82 provided in the hot water discharge pipe 42 for hot water supply from 4 and the temperature detection provided in the hot water discharge pipe 43a for hot bath discharge from the hot water supply apparatus 4 for hot water supply. And a temperature detecting means 84 provided in the bath-returning return pipe 43b for transporting bath water for bath-retreating to the hot water supply device 4.

And in 1st Embodiment-6th Embodiment mentioned above as well as this embodiment, a user takes out hot water from the hot water supply apparatus 4 as hot-water supply utilization or bath utilization (namely, the hot water of the hot water storage tank 2 is made into the hot-water supply apparatus 4). to hot water from the hot water supply unit 4 and tapping) case, has been set the set temperature T ₀ in the hot water temperature which is respectively as described above pouring, the water temperature as the temperature of the control target the set temperature T ₀ to be tapped In this embodiment, in order to shorten the time from when the user starts pouring the hot water until the hot water temperature reaches the set temperature T ₀ , the hot water temperature at the start of the hot water is a target temperature. If the temperature is lower than a predetermined temperature, the temperature control is performed by setting the control target temperature to a temperature T ₁ higher than the normal temperature (that is, the set temperature T _{0 for} each use) for a certain time Δt ₀ from the start of the hot water. Is to do.

In 1st Embodiment-6th Embodiment, as shown to Fig.4 (a), when a user takes out hot water from the hot water supply apparatus 4 as hot-water supply use or bath use, the hot-water temperature discharged is a control target temperature. In this embodiment, the temperature of the hot water discharged from the start of the hot water at the time t ₀ becomes the control target temperature T ₀ by controlling so as to be (set temperature T ₀ ). As shown in the figure, by setting the control target temperature of the hot water temperature to a predetermined temperature T ₁ higher than the normal temperature (set temperature T ₀ ) for a certain time Δt ₀ from the start of the hot water, The rate of change of temperature until the set temperature T ₀ that is the control target is large, and the time (rise time) from the start of pouring until the hot water temperature reaches the control target temperature (set temperature T ₀ ) is from the time t ₀ . Is a short time t ₁ .

  Next, an eighth embodiment of the present invention will be described. In the present embodiment, in any of the first to sixth embodiments, the temperature of the hot water supplied from the hot water storage tank 2 to the hot water supply device 4 and the hot water supply device 4 to the user are supplied. Temperature detecting means 8 for detecting either or both of the hot water temperatures to be discharged, and when discharging hot water from the hot water storage tank 2, either or both of the detected temperatures are the hot water temperature that the heat utilization device 5 controls. If the temperature is lower than the predetermined temperature difference or lower than a predetermined temperature difference, the auxiliary heat source 4 is set for a predetermined time in accordance with the temperature difference between the detected temperature and the control target temperature and the discharge flow rate from the start of the hot water. The hot water supply device 4 is allowed to be heated by '. In the present embodiment, the temperature detecting means 8 is provided in the hot water discharge pipe 23 for detecting the temperature of the hot water supplied from the hot water tank 2 to the hot water supply device 4 as shown in FIG. 3 as in the seventh embodiment. Temperature detection means 81, temperature detection means 82 provided in a hot water supply pipe 42 for hot water supply from the hot water supply device 4 for hot water supply, and a bath hot water supply for discharging hot water from the hot water supply device 4 for hot water supply Temperature detecting means 83 provided in the hot water outlet pipe 43a, and further provided with a temperature detecting means 84 provided in the bath follow-up return pipe 43b for transporting bath water for bath follow-up to the hot water supply device 4.

And in 1st Embodiment-6th Embodiment mentioned above as well as this embodiment, a user takes out hot water from the hot water supply apparatus 4 as hot-water supply utilization or bath utilization (namely, the hot water of the hot water storage tank 2 is made into the hot-water supply apparatus 4). to hot water from the hot water supply unit 4 and tapping) case, has been set the set temperature T ₀ in the hot water temperature which is respectively as described above pouring, the water temperature as the temperature of the control target the set temperature T ₀ to be tapped In this embodiment, in order to shorten the time from when the user starts pouring the hot water until the hot water temperature reaches the set temperature T ₀ , the hot water temperature at the start of hot water is the control target. When the temperature is lower than a predetermined temperature than the temperature, heating by the auxiliary heat source 4 ′ is permitted for a certain time Δt ₁ from the start of the hot water, and the heating by the auxiliary heat source 4 ′ is performed.

In the first to sixth embodiments, as shown in FIG. 5 (a), when the user takes out hot water from the hot water supply device 4 as hot water use or bath use, the temperature of the hot water to be taken out is controlled to a target temperature. FIG. 5B shows a place where the hot water temperature discharged from the start of hot water at the time t ₀ becomes the control target temperature T ₀ by controlling to be (set temperature T ₀ ) in this embodiment. In this way, by allowing the hot water supply device 4 to perform heating by the auxiliary heat source 4 ′ for a certain time Δt ₁ from the start of the hot water supply and performing heating by the auxiliary heat source 4 ′, the hot water temperature becomes the set temperature T ₀ that is a control target. The change rate of the temperature until the hot water temperature becomes a control target temperature (rise time) from the start of the hot water to a time t ₂ shorter than the time t ₀ is sufficient.

It is a block diagram of one Embodiment of a heat utilization apparatus. It is a block diagram of other embodiment of a heat utilization apparatus. It is a block diagram of further another embodiment of a heat utilization apparatus. (A) is an example of a temperature time chart in cases other than the seventh embodiment, and (b) is a temperature time chart of the seventh embodiment. (A) is an example of the temperature time chart in cases other than the eighth embodiment, and (b) is a temperature time chart of the eighth embodiment. It is a block diagram of the conventional heat utilization apparatus. It is a block diagram of the conventional hot-water supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat source 2 Hot water storage tank 3 Hot water storage tank control part 4 Hot water supply apparatus 41 Hot water supply control part 5 Heat utilization apparatus 6 Terminal 72 for setting Water supply path U Hot water tank unit

Claims (8)

  A hot water storage unit comprising a heat source, a hot water storage tank for storing the heat generated by the heat source as hot water, and a hot water storage tank control unit serving as a control unit for the entire heat utilization device, and hot water supply as an auxiliary heat source different from the hot water storage tank unit A heat utilization device is configured in combination with a device, and the hot water supply device can be used separately for hot water use and bath use, and bath hot water operation, addition hot water operation, bath hot water operation and hot water that keeps the bath water level constant. It enables each operation of automatic bathing that automatically keeps the bath temperature constant, and the set temperature of the hot water temperature when using the hot water supply entered by the user from the setting terminal, the set temperature of the hot water temperature when using the bath The hot water tank control unit acquires setting information of ON / OFF of the hot water bath operation, ON / OFF of the hot water operation, and ON / OFF of the automatic bath operation, and the hot water tank control unit discharges hot water from the hot water tank. For adjustment of hot water temperature and auxiliary heat source This is a control method in a heat utilization device that controls the temperature of hot water supplied to the user by controlling heating and heating prohibition, and discharges hot water from the hot water tank while bath hot water filling operation or additional hot water operation is ON In this case, the hot water storage tank control unit instructs the hot water supply device to prohibit heating by the auxiliary heat source, and controls the hot water temperature supplied to the user to be a set temperature when using the bath. Method.   A hot water storage unit comprising a heat source, a hot water storage tank for storing the heat generated by the heat source as hot water, and a hot water storage tank control unit serving as a control unit for the entire heat utilization device, and hot water supply as an auxiliary heat source different from the hot water storage tank unit A heat utilization device is configured in combination with a device, and the hot water supply device can be used separately for hot water use and bath use, and bath hot water operation, addition hot water operation, bath hot water operation and hot water that keeps the bath water level constant. It enables each operation of automatic bathing that automatically keeps the bath temperature constant, and the set temperature of the hot water temperature when using the hot water supply entered by the user from the setting terminal, the set temperature of the hot water temperature when using the bath The hot water tank control unit acquires setting information of ON / OFF of the hot water bath operation, ON / OFF of the hot water operation, and ON / OFF of the automatic bath operation, and the hot water tank control unit discharges hot water from the hot water tank. For adjustment of hot water temperature and auxiliary heat source This is a control method in the heat utilization device that controls the temperature of hot water supplied to the user by controlling heating and heating prohibition, and it is a certain time after the bath hot water operation, the additional hot water operation, or the bath automatic operation is turned on. When the hot water in the hot water tank is discharged, the hot water tank control unit instructs the hot water supply device to prohibit heating by the auxiliary heat source and controls the hot water temperature supplied to the user to be the set temperature when using the bath. A control method for a heat utilization device.   A hot water storage unit comprising a heat source, a hot water storage tank for storing the heat generated by the heat source as hot water, and a hot water storage tank control unit serving as a control unit for the entire heat utilization device, and hot water supply as an auxiliary heat source different from the hot water storage tank unit A heat utilization device is configured in combination with a device, and the hot water supply device can be used separately for hot water use and bath use, and bath hot water operation, addition hot water operation, bath hot water operation and hot water that keeps the bath water level constant. It enables each operation of automatic bathing that automatically keeps the bath temperature constant, and the set temperature of the hot water temperature when using the hot water supply entered by the user from the setting terminal, the set temperature of the hot water temperature when using the bath The hot water tank control unit acquires setting information of ON / OFF of the hot water bath operation, ON / OFF of the hot water operation, and ON / OFF of the automatic bath operation, and the hot water tank control unit discharges hot water from the hot water tank. For adjustment of hot water temperature and auxiliary heat source This is a control method in a heat utilization device that controls the temperature of hot water supplied to the user by controlling heating and heating prohibition, and the hot water storage tank with the bath hot water operation, the additional hot water operation, and the automatic bath operation turned off When the hot water is discharged, the hot water storage tank control unit instructs the hot water supply device to prohibit heating by the auxiliary heat source and controls the hot water temperature supplied to the user to be a set temperature when using the hot water supply. Control method of heat utilization device.   A hot water storage unit comprising a heat source, a hot water storage tank for storing the heat generated by the heat source as hot water, and a hot water storage tank control unit serving as a control unit for the entire heat utilization device, and hot water supply as an auxiliary heat source different from the hot water storage tank unit A heat utilization device is configured in combination with a device, and the hot water supply device can be used separately for hot water use and bath use, and bath hot water operation, addition hot water operation, bath hot water operation and hot water that keeps the bath water level constant. It enables each operation of automatic bathing that automatically keeps the bath temperature constant, and the set temperature of the hot water temperature when using the hot water supply entered by the user from the setting terminal, the set temperature of the hot water temperature when using the bath The hot water tank control unit acquires setting information of ON / OFF of the hot water bath operation, ON / OFF of the hot water operation, and ON / OFF of the automatic bath operation, and the hot water tank control unit discharges hot water from the hot water tank. For adjustment of hot water temperature and auxiliary heat source This is a control method in a heat utilization device that controls the temperature of hot water supplied to the user by controlling heating and heating prohibition, and when hot water in the hot water tank is discharged with automatic bath operation ON, hot water tank control Control the hot water supply device to prohibit heating by the auxiliary heat source, and control the hot water temperature supplied to the user to be the lower of the set temperature when using hot water and the set temperature when using bath A control method for a heat utilization device.   A hot water storage unit comprising a heat source, a hot water storage tank for storing the heat generated by the heat source as hot water, and a hot water storage tank control unit serving as a control unit for the entire heat utilization device, and hot water supply as an auxiliary heat source different from the hot water storage tank unit A heat utilization device is configured in combination with a device, and the hot water supply device can be used separately for hot water use and bath use, and bath hot water operation, addition hot water operation, bath hot water operation and hot water that keeps the bath water level constant. It enables each operation of automatic bathing that automatically keeps the bath temperature constant, and the set temperature of the hot water temperature when using the hot water supply entered by the user from the setting terminal, the set temperature of the hot water temperature when using the bath The hot water tank control unit acquires setting information of ON / OFF of the hot water bath operation, ON / OFF of the hot water operation, and ON / OFF of the automatic bath operation, and the hot water tank control unit discharges hot water from the hot water tank. For adjustment of hot water temperature and auxiliary heat source This is a control method in a heat utilization device that controls the temperature of hot water supplied to the user by controlling heating and heating prohibition, and when hot water in the hot water tank is discharged with automatic bath operation ON, hot water tank control First, the unit instructs the hot water supply device to prohibit heating by the auxiliary heat source, and the hot water temperature supplied to the user is set to the lower one of the set temperature when using the hot water and the set temperature when using the bath. A method for controlling a heat utilization device, characterized in that information on whether to use a hot water supply or a bath is obtained from a hot water supply device, and the hot water temperature is controlled to be a set temperature at the time of use. .   A hot water storage unit comprising a heat source, a hot water storage tank for storing the heat generated by the heat source as hot water, and a hot water storage tank control unit serving as a control unit for the entire heat utilization device, and hot water supply as an auxiliary heat source different from the hot water storage tank unit A heat utilization device is configured in combination with a device, and the hot water supply device can be used separately for hot water use and bath use, and bath hot water operation, addition hot water operation, bath hot water operation and hot water that keeps the bath water level constant. It enables each operation of automatic bathing that automatically keeps the bath temperature constant, and the set temperature of the hot water temperature when using the hot water supply entered by the user from the setting terminal, the set temperature of the hot water temperature when using the bath The hot water tank control unit acquires setting information of ON / OFF of the hot water bath operation, ON / OFF of the hot water operation, and ON / OFF of the automatic bath operation, and the hot water tank control unit discharges hot water from the hot water tank. For adjustment of hot water temperature and auxiliary heat source This is a control method in a heat utilization device that controls the temperature of hot water supplied to the user by controlling heating and heating prohibition, and when hot water in the hot water tank is discharged with automatic bath operation ON, hot water tank control First, the unit instructs the hot water supply device to prohibit heating by the auxiliary heat source, and the hot water temperature supplied to the user is set to the lower one of the set temperature when using the hot water and the set temperature when using the bath. Control, and then obtain the measurement information of the flow meter provided in one or both of the hot water outlet pipe and the bath follower pipe of the hot water supply device, and from the measurement information, either hot water use or bath use A control method for a heat utilization device, characterized by determining whether it is used and controlling the hot water temperature so as to be a set temperature at the time of use.   In Claim 1 thru | or 6, The temperature detection means which detects either the temperature of the warm water supplied to the said hot water supply apparatus, the temperature of the warm water supplied to a user from the said hot water supply apparatus, or both is provided, When hot water is discharged, if either or both of the detected temperatures are lower than the hot water temperature that is the control target of the heat utilization device, the temperature difference between the detected temperature and the control target temperature from the start of hot water, A heat utilization device characterized in that the temperature set as a control target is controlled by setting the temperature difference between the detected temperature and the temperature set as the control target higher by a predetermined temperature depending on the tapping flow rate, and a predetermined temperature depending on the tapping flow rate. Control method.   In Claim 1 thru | or 6, The temperature detection means which detects either the temperature of the warm water supplied to the said hot water supply apparatus, the temperature of the warm water supplied to a user from the said hot water supply apparatus, or both is provided, When hot water is discharged, if either or both of the detected temperatures are lower than the hot water temperature that is the control target of the heat utilization device, the temperature difference between the detected temperature and the control target temperature from the start of hot water, A method for controlling a heat utilization device, wherein heating by an auxiliary heat source is permitted to a hot water supply device for a predetermined time according to a hot water flow rate.

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