Hot water type heating device and control method of hot water type heating device

Abstract

To provide a heating device that suppresses a difference in warming states of each heat radiation circuit due to a difference in flow passage resistance.SOLUTION: A hot water type heating device 10 includes: a first heat radiation circuit 60a which has a first radiator 50a for heating a space by radiating the heat of the water heating medium and where a water heating medium circulates; a second heat radiation circuit 60b which passes through a second radiator 50b connected in parallel with the first radiator 50a; a first on-off valve 40a which adjusts a flow rate of the water heating medium of the first radiation circuit 60a; a second on-off valve 40b which adjusts a flow rate of the water heating medium of the second radiation circuit 60b; a circulation device 13 for circulating the water heating medium; a heating device 12 which heats the water heating medium; and a control device 15 which controls the first on-off valve 40a and the second on-off valve 40b so that a difference in the flow rate of the water heating medium flowing through the first radiation circuit 60a and the second radiation circuit 60b falls within a predetermined range on the basis of a ratio of a first flow passage resistance which is a flow passage resistance of the first radiation circuit 60a to a second flow passage resistance which is a flow passage resistance of the second radiation circuit 60b.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a hot water heating device that uses heat radiation from a heated water heat transfer medium, and a method for controlling the hot water heating device. [Background technology]

[0002] A hot water heating system forms a circulation path for the water heat transfer medium by connecting a hot water heat source machine and a radiator with hot water piping. A hot water heating system is a system that heats by circulating the water heat transfer medium heated in the hot water heat source machine through the circulation device of the hot water heat source machine and radiating the heat of the water heat transfer medium with a radiator. A hot water heating system can heat multiple spaces with one hot water heat source machine by branching part of the circulation path into multiple parallel branches and constructing multiple heat radiation circuits with a radiator on each branch.

[0003] Generally, a house has a number of separate rooms, such as a living room, a bedroom, a washroom, a toilet, and a corridor. When a hot water heating device is installed in a house, a radiator is placed in each room and a heat dissipation circuit is constructed so that each room can be individually controlled. Each room is provided with a remote control for various settings such as turning the hot water heating device on / off and setting the temperature. The user can set various settings for each heat dissipation circuit. When the temperature settings differ depending on the room, a technology has been disclosed in which an on-off valve is provided in the branch path of the heat dissipation circuit installed in each room, and the amount of water heat transfer medium flowing in the heat dissipation circuit is adjusted by controlling the on-off valve, thereby heating each room according to the set temperature (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-329570 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, the radiator of a hot water heating device has a hot water pipe inside, and the water heat transfer medium flowing through the hot water pipe radiates heat to heat the space. The longer the hot water pipe of the radiator, the more heat is radiated, and the higher the heating capacity. However, the longer the hot water pipe of the radiator, the greater the flow resistance of the heat dissipation circuit, making it difficult for the water heat transfer medium pushed out by the circulation device to flow, and the flow rate of the water heat transfer medium flowing through the heat dissipation circuit decreases. Therefore, the length of the hot water pipe of the radiator is limited depending on the capacity of the circulation device. When installing a radiator in a large room, one heat dissipation circuit cannot heat the room sufficiently due to the limit of the pipe length. Therefore, in large rooms, multiple heat dissipation circuits may be installed in one room.

[0006] When multiple heat dissipation circuits are installed in one room, if the flow resistance of each heat dissipation circuit differs, the circulation flow rate of the water heat transfer medium will differ for each heat dissipation circuit. Therefore, the way the space is heated by the heat dissipation of the water heat transfer medium will differ for each heat dissipation circuit, compromising the comfort of the users.

[0007] The present disclosure has been made to solve the above-mentioned problems, and provides a heating device that suppresses differences in heating rates between heat dissipation circuits caused by differences in flow path resistance. [Means for solving the problem]

[0008] The hot water heating device according to the present disclosure has a first radiator that heats a space by radiating heat from a water heat medium, a first heat radiation circuit through which the water heat medium circulates, a second radiator that is connected in parallel with the first radiator and heats a space by radiating heat from the water heat medium, a second heat radiation circuit through which the water heat medium circulates, a first on-off valve that is arranged in the first heat radiation circuit and adjusts the flow rate of the water heat medium flowing in the first heat radiation circuit, and a second on-off valve that is arranged in the second heat radiation circuit and adjusts the flow rate of the water heat medium flowing in the second heat radiation circuit. The water heat transfer medium supply system includes a second on-off valve that connects the first and second heat dissipation circuits, a circulation device that circulates the water heat transfer medium between the first and second heat dissipation circuits, a heating device that heats the water heat transfer medium, and a control device that controls the first and second on-off valves so that the difference between the flow rate of the water heat transfer medium flowing in the first heat dissipation circuit and the flow rate of the water heat transfer medium flowing in the second heat dissipation circuit is within a predetermined range based on the ratio between a first flow resistance that is the flow resistance of the first heat dissipation circuit and a second flow resistance that is the flow resistance of the second heat dissipation circuit.

[0009] The control method according to the present disclosure includes a first heat dissipation circuit in which the water heat medium circulates, the first heat dissipation circuit having a first radiator that heats a space by dissipating heat from the water heat medium, the second heat dissipation circuit having a second radiator connected in parallel to the first radiator that heats a space by dissipating heat from the water heat medium and the second heat dissipation circuit in which the water heat medium circulates, a first on-off valve that is disposed in the first heat dissipation circuit and adjusts the flow rate of the water heat medium flowing in the first heat dissipation circuit, a second on-off valve that is disposed in the second heat dissipation circuit and adjusts the flow rate of the water heat medium flowing in the second heat dissipation circuit, and a water heater between the first heat dissipation circuit and the second heat dissipation circuit. A control method for a hot water heating device comprising a circulation device for circulating a heat transfer medium, a heating device for heating a water heat transfer medium, and a control device for storing a first flow path resistance which is the flow path resistance of a first heat dissipation circuit and a second flow path resistance which is the flow path resistance of a second heat dissipation circuit, the control device comprising a step of determining a control method for a first opening / closing valve and a second opening / closing valve based on a ratio between the first flow path resistance and the second flow path resistance so that a difference between the flow rate of the water heat transfer medium flowing in the first heat dissipation circuit and the flow rate of the water heat transfer medium flowing in the second heat dissipation circuit is within a predetermined range. Effect of the Invention

[0010] According to the present disclosure, by controlling the on-off valves of the heat dissipation circuits in accordance with the flow resistance, it is possible to suppress the difference in the heating rate between the heat dissipation circuits, thereby making it possible to provide a more comfortable heated space. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram showing a configuration of a hot water heating device according to a first embodiment. [Diagram 2] FIG. 2 is a block diagram showing a functional configuration of a control device. [Diagram 3] 13 is an example of an on-off valve-space table. [Figure 4] 1 is a flowchart showing a test run of a hot water heating device. [Diagram 5] 5 is a flowchart showing a method for estimating a flow path resistance of a heat dissipation circuit in the first embodiment. [Figure 6] 10 is a graph showing the relationship between power consumption and flow path resistance in a circulation device. [Figure 7] 10 is a flowchart showing temperature control by controlling an on-off valve of a hot water heating device when control based on flow path resistance is not performed. [Figure 8] 13 is a graph showing the relationship between room temperature and bed temperature and time when control based on flow path resistance is not performed, and a timing chart showing control of an on-off valve. [Figure 9] 10 is a flowchart showing temperature control by controlling an on-off valve of a hot water heating device when control is performed based on flow path resistance. [Figure 10] 13 is a graph showing the relationship between room temperature and bed temperature and time when control is performed based on flow path resistance, and a timing chart showing control of an on-off valve. [Figure 11] 10 is a timing chart showing control of an on-off valve using flow path resistance (when the second on-off valve is normally open). [Figure 12] 10 is a timing chart showing control of the on-off valve using flow path resistance (when the second on-off valve is in the opening and closing operation). [Figure 13]11 is a graph showing a performance curve of a circulation device and a resistance curve of a circulation path in the second embodiment. [Figure 14] 10 is a flowchart showing a method for estimating the flow path resistance of a heat dissipation circuit in the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The embodiments for carrying out the subject of the present disclosure will be described with reference to the accompanying drawings. In each drawing, the same or corresponding parts are given the same reference numerals, and duplicated descriptions are appropriately simplified or omitted. Note that the subject of the present disclosure is not limited to the following embodiments, and any component of the embodiment may be modified or omitted within the scope of the gist of the present disclosure.

[0013] Embodiment 1 FIG. 1 is a diagram showing the configuration of a hot water heating device 10 according to an embodiment of the present disclosure. In the hot water heating device 10, a hot water heat source device 1 that heats and circulates a water heat medium and a radiator 50 that is arranged in a heating space 2 and heats by radiating heat from the water heat medium are connected by piping to form a circulation path 16. The water heat medium pushed out by a circulation device 13 inside the hot water heat source device 1 flows in one direction through the circulation path 16. The arrows in FIG. 1 indicate the direction in which the water heat medium flows. The heating space 2 that the hot water heating device 10 heats refers to a separated room or space such as a living room, bedroom, or hallway in a house, and the hot water heating device 10 heats one or more heating spaces 2. The hot water heating device 10 is equipped with two or more radiators 50. 1, a first radiator 50a and a second radiator 50b are installed as radiators 50 in one heating space 2, and a first on-off valve 40a and a second on-off valve 40b are installed at branch points of a circulation path 16 connecting to the first radiator 50a and the second radiator 50b, respectively. The other heating spaces 2, radiators 50, and on-off valves 40 are not shown.

[0014] A part of the circulation path 16 of the hot water heating device 10 branches, and a plurality of heat dissipation circuits 60 including a radiator 50 are configured in parallel. FIG. 1 shows a first heat dissipation circuit 60a including a first radiator 50a and a second heat dissipation circuit 60b including a second radiator 50b. When any of the heat dissipation circuits configured by a part of the circulation path 16 of the hot water heating device 10 branching is referred to as a heat dissipation circuit 60 without distinction. The first heat dissipation circuit 60a, into which the circulation path 16 of the hot water heating device 10 branches, is provided with a first on-off valve 40a in a pipe downstream in the direction of flow of the water heat medium from the branch point, and the second heat dissipation circuit 60b is provided with a second on-off valve 40b in a pipe downstream of the branch point. When any of the on-off valves installed in each heat dissipation circuit 60 is referred to without distinction, it is referred to as an on-off valve 40. The on-off valve 40 adjusts the amount of water heat transfer medium circulating through each heat dissipation circuit 60 by adjusting the on-off operation or opening degree.

[0015] In this embodiment, the term "water heat transfer medium" refers not only to water, but also to water and antifreeze. This includes various types of circulating liquid that can be used as a heat transfer medium.

[0016] The hot water heat source device 1 includes a cistern tank 11, a heating device 12, a circulation device 13, a water heat medium temperature detection unit 14, and a control device 15. The heating device 12 is a device that heats the water heat medium. The heating device 12 can be a gas boiler, an oil boiler, a kerosene heater, an electric heater, or a heater device using a heat pump. The circulation device 13 is a pump that flows the water heat medium through a circulation path 16. The water heat medium pushed out by the circulation device 13 passes through a radiator 50, returns to the hot water heat source device 1, and is stored in the cistern tank 11. The water heat medium temperature detection unit 14 detects the temperature of the water heat medium sent out from the circulation device 13. The water heat medium temperature detection unit 14 outputs the temperature detection result to the control device 15.

[0017] The control device 15 controls the operation of the heating device 12, the circulation device 13, and the on-off valve 40. The control device 15 is capable of communicating with the water heat medium temperature detection unit 14, and can acquire the water heat medium temperature detected by the water heat medium temperature detection unit 14. The control device 15 is capable of communicating with the room temperature detection unit 5 installed in the heated space 2, and can acquire the room temperature of the heated space 2 detected by the room temperature detection unit 5. The control device 15 is also capable of communicating with a remote control 6 installed in the heated space 2, and can acquire operation information such as operation on / off and temperature setting of the hot water heating device 10 set by the user operating the remote control 6. The control device 15 may be provided outside the hot water heat source unit 1.

[0018] The radiator 50 has piping through which the water heat transfer medium flows. The radiator 50 is disposed in the heated space 2, and is included in the circulation path 16 of the hot water heating device 10. When the water heat transfer medium circulated from the hot water heat source unit 1 flows through the piping of the radiator 50, the radiator 50 radiates heat from the water heat transfer medium, thereby heating the heated space 2. The radiator 50 is, for example, a floor heating panel, a panel heater, or a fan convector.

[0019] The on-off valve 40 is provided in each of the multiple heat dissipation circuits 60 into which the circulation path 16 branches. The on-off valve 40 can be opened and closed between an open state in which the water heat transfer medium flows through the heat dissipation circuit 60 and a closed state in which the water heat transfer medium does not flow through the heat dissipation circuit 60. The on-off valve 40 periodically opens and closes to adjust the amount of water heat transfer medium flowing through the heat dissipation circuit 60. The on-off valve 40 may be capable of adjusting the opening degree to adjust the amount of water heat transfer medium flowing through the heat dissipation circuit 60, in addition to the open and closed states. The on-off valve 40 has its open / closed state or opening degree controlled by the control device 15.

[0020] The remote control 6 is installed in the heated space 2. The remote control 6 has an operation unit (not shown) that accepts operations from the user, and a display unit (not shown) that displays the state of the hot water heating device 10. The remote control 6 is capable of communicating with the control device 15, and transmits setting information such as the temperature setting and heating on / off operated by the user to the control device 15. The remote control 6 also obtains operation information of the hot water heating device 10 from the control device 15 and displays it on the display unit. If there are multiple heated spaces 2, a remote control 6 exists for each heated space 2, and the set temperature and heating on / off can be set for each heated space 2. Note that even if there are multiple heated spaces 2, the remote control 6 may be installed in only one place in the house, and the set temperature and heating on / off for each heated space 2 may be set from a single remote control 6.

[0021] The room temperature detection unit 5 is installed in the heated space 2. The room temperature detection unit 5 may be integrated with the remote control 6. The room temperature detection unit 5 detects the room temperature of the heated space 2. The room temperature detection unit 5 is capable of communicating with the control device 15, and transmits the detected room temperature to the control device 15. When there are multiple heated spaces 2, a room temperature detection unit 5 is provided for each heated space 2, and the control device 15 acquires the room temperature of each heated space 2.

[0022] Fig. 2 is a block diagram showing the functional configuration of the control device 15. The functions of the control device 15 will be described with reference to Fig. 2. The control device 15 has an operation information acquisition unit 24 that acquires operation information input to the remote control 6, a room temperature acquisition unit 25 that acquires the room temperature detected by the room temperature detection unit 5, an on-off valve control unit 26 that controls the opening and closing of the on-off valve 40, a water temperature control unit 27 that controls the heating device 12 based on the water temperature detected by the water heat medium temperature detection unit 14 that detects the temperature of the water heat medium sent from the hot water heat source device 1 by the circulation device 13, a circulation device control unit 30 that controls the drive of the circulation device 13, a flow path resistance estimation unit 28 that estimates the flow path resistance, and a memory 20 that stores various information.

[0023] The control device 15 includes at least one processor and at least one memory. The operation information acquisition unit 24, room temperature acquisition unit 25, on-off valve control unit 26, water temperature control unit 27, circulation device control unit 30, and flow path resistance estimation unit 28 of the control device 15 are components consisting of software, firmware, or a combination of software and firmware. The processor is also called a CPU (Central Processing Unit), processing device, arithmetic device, microprocessor, microcomputer, or DSP. The memory 20 is composed of, for example, a non-volatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, or an EEPROM.

[0024] The circulation device control unit 30 of the control device 15 controls the operation of the circulation device 13 and acquires operation information of the circulation device 13. The circulation device control unit 30 has a rotation speed control unit 31 that controls the rotation speed of the motor that drives the pump that is the circulation device 13, an operation control unit 32 that controls the on / off of the drive of the motor, a power consumption acquisition unit 33 that acquires the power consumption of the circulation device 13, and a rotation speed acquisition unit 34 that acquires the rotation speed of the motor.

[0025] The memory 20 of the control device 15 has an on-off valve-space table 21 indicating the allocation of on-off valves 40 and heating spaces 2, circulation device performance information 22 indicating the performance of the circulation device 13 used in the flow path resistance estimation process of the heat dissipation circuit 60, and a flow path resistance storage unit 23 storing the flow path resistance of each heat dissipation circuit 60 estimated by the flow path resistance estimation unit 28. The flow path resistance is a force that prevents the water heat medium from flowing due to friction generated between the water heat medium and the inner wall of the piping when the water heat medium flows through each heat dissipation circuit 60, which is the circulation path 16 of the water heat medium. The smaller the flow path resistance of the heat dissipation circuit 60, the easier it is for the water heat medium to flow, and the larger the flow path resistance, the more difficult it is for the water heat medium to flow. The flow path resistance estimation process will be described later.

[0026] FIG. 3 is an example of the on-off valve-space table 21. The on-off valve-space table 21 indicates the allocation of the on-off valve 40 and the heating space 2. In the example of FIG. 3, it is shown that the on-off valve numbers 1 and 2 correspond to the heat radiation circuit 60 passing through the radiator 50 installed in the living room of the heating space number 1. When controlling the temperature of the heating space 2, the control device 15 controls the on-off valve by referring to the on-off valve-space table 21. In the example of FIG. 3, it is understood that the control device 15 only needs to control the on-off valves with the on-off valve numbers 1 and 2 by referring to the on-off valve-space table 21 when adjusting the temperature of the living room. The information of the on-off valve-space table 21 is input by the user or the construction company through the remote control 6 during construction of the hot water heating device 10, for example.

[0027] Before construction, the hot water heating device 10 can calculate the flow resistance of each heat dissipation circuit 60 from the size of each radiator 50. The flow resistance is a force that prevents the water heat transfer medium from flowing due to friction generated between the water heat transfer medium and the inner wall of the pipe, and is therefore roughly determined by the length of the pipe through which the water heat transfer medium flows. The radiator 50 has a pipe inside, and the flow resistance can be roughly calculated from the length of the pipe. The calculated flow resistance value of each heat dissipation circuit 60 is stored in advance in the flow resistance memory unit 23, and the hot water heating device 10 suppresses the water heat transfer medium flowing in the heat dissipation circuit 60 by controlling the opening and closing valve 40 using the flow resistance. The control of the opening and closing valve 40 using the flow resistance will be described later, but since the flow resistance used is the ratio of the flow resistance of each heat dissipation circuit 60, the flow resistance stored in the flow resistance memory unit 23 may be the ratio of the length of the pipe of each radiator 50 instead of the resistance value.

[0028] However, the flow resistance of the heat dissipation circuit 60 is affected not only by the piping length of the radiator 50, but also by the length and shape of the water heat transfer medium piping from the circulation device 13 to the radiator 50. Therefore, after installing the hot water heating device 10, it is desirable to actually circulate the water heat transfer medium and estimate the flow resistance of each heat dissipation circuit 60, thereby obtaining a more accurate flow resistance of each heat dissipation circuit 60.

[0029] FIG. 4 is a flow chart showing the process of the trial run of the hot water heating device 10. After construction, the hot water heating device 10 is trial run by the installer before heating is performed. After construction, the hot water heating device 10 refills the cistern tank 11 with water refrigerant and fills the circulation path 16 with water heat transfer medium. In order to perform air removal to remove air remaining in the circulation path 16, a trial run must be performed when the hot water heating device 10 is operated for the first time after construction. Once a trial run is performed after construction, air is removed from the circulation path 16, so that a trial run is not necessary the next time the power is turned on. During the trial run, the control device 15 estimates the flow path resistance of each heat dissipation circuit 60. The trial run process and the flow path resistance estimation process will be described with reference to FIG. 4.

[0030] First, in step S201, the hot water heat source unit 1 of the hot water heating device 10 is powered on. Next, in step S202, the operation information acquisition unit 24 of the control device 15 checks whether or not there is an instruction to perform a trial run. The instruction to perform a trial run is given, for example, by the installer operating the remote control 6 and inputting an instruction to perform a trial run. The remote control 6 transmits an instruction to perform a trial run to the control device 15, and the operation information acquisition unit 24 of the control device 15 receives the instruction to perform a trial run. Before the hot water heat source unit 1 is powered on in step S201, the remote control 6 is powered on and in a state in which it can accept operations by the installer. Alternatively, the instruction to perform a trial run may be given by the installer operating a switch on a circuit board of the control device 15. In this case, the control device 15 judges the instruction to perform a trial run from the information from the switch on the circuit board. If there is no instruction to perform a trial run in step S202, the process proceeds to step S209. If there is an instruction to perform a trial run, the process proceeds to step S203.

[0031] In step S203, the on-off valve control unit 26 of the control device 15 opens the first on-off valve 40a and closes the second on-off valve 40b. At this time, if there are three or more heat dissipation circuits 60, one on-off valve 40 is opened and the other on-off valves 40 are closed. Next, the process proceeds to step S204.

[0032] In step S204, the operation control unit 32 of the circulation device control unit 30 of the control device 15 operates the circulation device 13. When the circulation device 13 operates, it sucks up the water heat transfer medium refilled in the cistern tank 11 and circulates it to the first heat dissipation circuit 60a. Next, proceed to step S205.

[0033] In step S205, the operation information acquisition unit 24 of the control device 15 judges whether there is an instruction to switch the on-off valve 40. The on-off valve 40 switching instruction is input by the installer by operating the remote control 6. When the installer judges that the air has been released from the piping of the heat dissipation circuit 60 with the on-off valve 40 open, the installer operates the remote control 6 to input an instruction to switch the on-off valve 40. Although not shown, the hot water heat source device 1 has an automatic air vent valve. To determine whether the air has been released from the piping of the heat dissipation circuit 60, the installer judges by visual inspection or sound that air has stopped leaking from the automatic air vent valve. If there is no instruction to switch the on-off valve 40, proceed to step S208. If there is an instruction to switch the on-off valve 40, proceed to step S206.

[0034] In step S206, the flow path resistance estimation unit 28 of the control device 15 estimates the flow path resistance of the heat dissipation circuit 60 with the on-off valve 40 open. In step S206, the air is released from the piping of the heat dissipation circuit 60 with the on-off valve 40 open. FIG. 5 is a flowchart showing a method for estimating the flow path resistance of the heat dissipation circuit 60. FIG. 5 is a flow showing details of step S206 in FIG. 4. The method for estimating the flow path resistance of the heat dissipation circuit 60 will be described with reference to FIG. 5.

[0035] In step S301, the rotation speed control unit 31 of the circulation device control unit 30 operates the circulation device 13 at a constant rotation speed set in advance. Here, the rotation speed refers to the rotation speed of the motor that drives the pump that is the circulation device 13. The rotation speed of the motor is determined by the frequency of the power applied to the motor. The circulation device 13 is equipped with an inverter (not shown) that converts the frequency, and drives the motor at the rotation speed specified by the rotation speed control unit 31. Next, proceed to step S302.

[0036] In step S302, the power consumption acquisition unit 33 acquires the power consumption of the circulation device 13 operated at a constant rotation speed in step S301. At this time, in order to wait until the circulation device 13 operates stably, the rotation speed of the motor of the circulation device 13 may be acquired after a certain time has elapsed. Next, the process proceeds to step S303.

[0037] In step S303, the flow path resistance estimation unit 28 refers to the circulating device performance information 22 stored in the memory 20. The circulating device performance information 22 is a power consumption value-flow path resistance table showing the relationship between the power consumption value and the flow path resistance of the circulating device 13. The power consumption value-flow path resistance table is a table showing the relationship between the power consumption of the circulating device 13 and the flow path resistance of the water heat medium circulation path 16 connected to the circulating device 13 at that time when the pump, which is the circulating device 13, is operated at a constant rotation speed. FIG. 6 is a graph showing the relationship between the power consumption value and the flow path resistance in the circulating device 13. The power consumption value-flow path resistance table is a table showing the values ​​of the graph in FIG. 6 in a discrete manner. The flow path resistance estimation unit 28 acquires the flow path resistance at the power consumption value of the circulating device 13 acquired by the power consumption acquisition unit 33 in step S302 from the power consumption value-flow path resistance table. The power consumption value-flow path resistance table is previously stored in the memory 20 of the control device 15 as the performance of the pump, which is the circulating device 13, obtained by experiment.

[0038] In step S304, the flow path resistance estimation unit 28 stores the flow path resistance acquired in step S303 in the flow path resistance storage unit 23 of the control device 15. The flow path resistance is stored in association with the target heat dissipation circuit 60, i.e., the heat dissipation circuit 60 in which the on-off valve 40 is open at this time. Note that the flow path resistance is expressed as the amount of energy per unit volume, but the temperature control by controlling the on-off valve 40 using the flow path resistance, which will be described later, only requires knowing the relative value of the flow path resistance of each heat dissipation circuit 60. Therefore, the flow path resistance stored in the flow path resistance storage unit 23 may be the ratio of the flow path resistance of each heat dissipation circuit 60. With this, the estimation process of the flow path resistance of the heat dissipation circuit 60, which is step S206, is completed. Next, proceed to step S207.

[0039] In step S207, the on-off valve control unit 26 of the control device 15 switches the on-off valve 40. The on-off valve control unit 26 opens the second on-off valve 40b closed in step S203, and closes the first on-off valve 40a opened in step S203. At this time, if there are three or more heat dissipation circuits 60, one of the on-off valves 40 installed in the heat dissipation circuit 60 for which the air venting and flow path resistance estimation processing of the piping has not yet been performed is opened, and the other on-off valves 40 are closed. Next, the process returns to step S205. Note that, if there are three or more heat dissipation circuits 60, the processes from S205 to S207 are repeated and performed for each heat dissipation circuit 60, thereby performing the air venting and flow path resistance estimation processing for all of the heat dissipation circuits 60.

[0040] If there is no instruction to switch the on-off valve 40 in step S205, the process proceeds to step S208. In step S208, the control device 15 determines whether there is an instruction to end the test run. The installer inputs the instruction to end the test run by operating the remote control 6. Alternatively, the installer inputs the instruction to end the test run by operating a switch on the circuit board of the control device 15. The installer performs the processes from step S205 to step S207 for all heat dissipation circuits 60, and inputs an instruction to end the test run when the air release process and the process of estimating the flow path resistance of the heat dissipation circuits 60 are completed. If there is an instruction to end the test run in step S208, the test run ends, the process proceeds to step S209, and the hot water heating device 10 goes into standby mode.

[0041] Next, a method for adjusting the temperature of the hot water heating device 10 will be described. The temperature of the heating space 2 can be adjusted by controlling the heating device 12 to change the temperature of the water heat transfer medium flowing through the radiator 50. The temperature of the heating space 2 can also be adjusted by controlling the opening and closing of the on-off valve 40 to adjust the flow rate of the water heat transfer medium in the heat dissipation circuit 60 passing through the radiator 50. In a temperature adjustment method in which the control device 15 controls the heating device 12 and changes the temperature of the water heat transfer medium flowing through the radiator 50, there is a problem that the temperature of the water heat transfer medium takes time to heat or cool. In addition, in the case where the remote controls 6 installed in multiple heating spaces 2 each have a different set temperature, for example, when the room temperature of one heating space 2 drops and becomes lower than the set temperature, if the heating device 12 heats the water heat transfer medium, the room temperature of the other heating spaces 2 will rise above the set temperature. In addition, in the case where the heating device 12 is, for example, a heat pump, there is a problem that the higher the temperature of the water heat transfer medium to be heated, the worse the operating efficiency will be as a characteristic of the heat pump. For the reasons above, it may be difficult to adjust the temperature of the heated space 2 by changing the temperature of the water heat transfer medium using the heating device 12, in which case the flow rate of the water heat transfer medium in the heat dissipation circuit 60 is adjusted by controlling the opening and closing of the on-off valve 40 to adjust the temperature of the heated space 2. In this embodiment, a method of adjusting the temperature of the heated space 2 by controlling the opening and closing of the on-off valve 40 to adjust the flow rate of the water heat transfer medium in the heat dissipation circuit 60 will be described.

[0042] Here, the first heat dissipation circuit 60a including the first radiator 50a has a smaller flow path resistance value than the second heat dissipation circuit 60b including the second radiator 50b. First, the operation of the on-off valve 40 and the temperature rise will be described in the case where the on-off valve 40 is not controlled based on the flow path resistance. FIG. 7 is a flowchart showing temperature control by controlling the on-off valve 40 of the hot water heating device 10 in the case where control based on the flow path resistance is not performed. First, with reference to FIG. 7, temperature control by controlling the on-off valve 40 of the hot water heating device 10 in the case where control based on the flow path resistance is not performed, which is the conventional technology, will be described.

[0043] First, the user turns on the heating by operating the remote control 6 for the heated space 2. Although not shown, when the heating is turned on, the heating device 12 is driven and the water heat transfer medium is heated. However, if there are multiple heated spaces 2, the heating device 12 is already driven when the heating of any of the heated spaces 2 is on. Next, in step S401, the control device 15 refers to the on-off valve-space allocation table and sets all on-off valves 40 corresponding to the heated space 2 to an open state allowing the water heat transfer medium to flow. With this operation, the heated water heat transfer medium flows to the radiator 50 installed in the heated space 2, starting the heating, and the room temperature of the heated space 2 rises.

[0044] 8 is a graph showing the relationship between room temperature and bed temperature and time when control based on flow path resistance is not performed, and a timing chart showing the control of the on-off valve 40. The graph showing the relationship between room temperature and bed temperature and time in Fig. 8 shows how the heated water heat transfer medium flows through the heat dissipation circuit 60 installed in the heating space 2, heating the heating space 2, and the room temperature detected by the room temperature detection unit 5 installed in the heating space 2 rises.

[0045] Next, in step S402, the control device 15 obtains the room temperature detected by the room temperature detection unit 5 installed in the heated space 2 and compares it with the upper limit of the set temperature range. The set temperature range refers to a range with a certain temperature margin around the set temperature set by the user via the remote control 6 (for example, set temperature -2°C to set temperature +2°C). The upper limit of the set temperature range refers to the highest temperature included in the set temperature range. In FIG. 8, the room temperature reaches the upper limit of the set temperature range at time T1. If the room temperature is higher than the upper limit of the set temperature range, proceed to step S403. Otherwise, that is, if the room temperature is lower than or equal to the upper limit of the set temperature range, proceed to step S405.

[0046] Next, in step S403, the control device 15 obtains the state of the on-off valve 40 corresponding to the heating space 2 and determines whether it is in the open state. If it is in the open state, proceed to step S404. Otherwise, that is, if it is in the closed state or in the opening / closing operation, proceed to step S405. The opening and closing operation of the on-off valve 40 refers to a state in which it alternates between an open state in which the water heating medium flows and a closed state in which the water heating medium does not flow. When the on-off valve 40 is in the opening and closing operation, the amount of water heating medium flowing in the heat dissipation circuit 60 is less than in the open state, and the heating effect is suppressed.

[0047] Next, in step S404, the control device 15 starts the opening and closing operation of the on-off valve 40 corresponding to the heating space 2. At the time of step S404, the room temperature has reached the upper limit of the set temperature range as shown at time T1 in FIG. 8, and is therefore in an overheated state. As shown from time T1 to T2 in FIG. 8, the amount of water-based heat transfer medium flowing through the heat dissipation circuit 60 is reduced by opening and closing the on-off valve 40, the heating effect is suppressed, and the room temperature of the heating space 2 drops due to the influence of the outside air temperature. Note that the on-off valve 40 may be kept constantly closed to reduce the amount of water-based heat transfer medium flowing through the heat dissipation circuit 60 in order to suppress the heating effect. Next, proceed to step S405.

[0048] In step S405, the control device 15 obtains the room temperature detected by the room temperature detection unit 5 installed in the heated space 2 and compares it with the lower limit of the set temperature range. The lower limit of the set temperature range refers to the lowest temperature included in the set temperature range. In FIG. 8, the room temperature is the lower limit of the set temperature range at time T2. If the room temperature is lower than the lower limit of the set temperature range, the process proceeds to step S406. Otherwise, that is, if the room temperature is higher than or equal to the lower limit of the set temperature range, the process proceeds to step S408.

[0049] Next, in step S406, the control device 15 acquires the state of the on-off valve 40 corresponding to the heated space 2 and determines whether it is open. If it is open, the process proceeds to step S408. Otherwise, that is, if it is closed or in the process of opening or closing, the process proceeds to step S407.

[0050] Next, in step S407, the control device 15 opens the on-off valve 40 corresponding to the heating space 2. At the time of step S407, the room temperature is lower than the lower limit of the set temperature range, as shown at time T2 in Fig. 8. By opening the on-off valve 40, the water heat transfer medium is allowed to constantly flow to the radiator 50 installed in the heating space 2, improving the heating effect and raising the room temperature. Next, the process proceeds to step S408.

[0051] Next, in step S408, the control device 15 determines whether a stop operation has been performed from the remote control 6. If a stop operation has been performed, the control device 15 stops the heating device 12 and closes the on-off valve 40 in order to stop the heating of the heated space 2, although this is not shown in the figure. If the heating device 12 cannot be stopped because a heating space 2 other than the controlled space is being heated, the on-off valve 40 corresponding to the controlled heating space 2 is closed, so that the water heat transfer medium does not flow to the radiator 50 installed in the controlled heating space 2, and it is possible to stop the heating of only the controlled heating space 2. If a stop operation has not been performed, the process returns to step S402, and control of the on-off valve 40 according to the room temperature is repeated.

[0052] As described above, temperature control by controlling the on-off valve 40 of the hot water heating device 10 allows the room temperature to be maintained within the set temperature range by comparing the room temperature detected by the room temperature detection unit 5 with the set temperature set in the remote control 6 and controlling the on-off valve 40.

[0053] However, when multiple radiators 50 are installed in the heating space 2, the amount of water heat transfer medium flowing through each radiator 50 differs due to the difference in flow resistance of each heat dissipation circuit 60, and the temperature around the radiator 50 differs. When the radiator 50 is a floor heating panel, the temperature of the floor surface where the first radiator 50a is installed (hereinafter referred to as floor temperature) is A1, and the floor temperature where the second radiator 50b is installed is A2. The graph in FIG. 8 shows the transition of the floor temperature along with the room temperature. The first heat dissipation circuit 60a including the first radiator 50a has a smaller flow resistance value and a larger flow rate of water heat transfer medium than the second heat dissipation circuit 60b including the second radiator 50b, so the floor temperature A1 rises in temperature earlier than the floor temperature A2. The floor temperature A1 exceeds the set room temperature range before the room temperature reaches the upper limit of the set room temperature range. On the other hand, the floor temperature A2 falls below the set room temperature range after time T2, even though the room temperature is within the set room temperature range. That is, even if the room temperature in the heated space 2 is within the set room temperature range, the space may be too warm or not warm enough depending on where the radiator 50 is installed, resulting in temperature unevenness, which reduces the comfort of the user.

[0054] Therefore, the on-off valve 40 is controlled based on the flow path resistance of each heat dissipation circuit 60 estimated during test operation of the hot water heating device 10. Fig. 9 is a flowchart showing temperature control by controlling the on-off valve 40 of the hot water heating device 10 when control is performed based on the flow path resistance. Temperature control by controlling the on-off valve 40 of the hot water heating device 10 when using the flow path resistance will be described with reference to Fig. 9.

[0055] First, the user operates the remote control 6 for the heated space 2 to turn on the heating, and the process proceeds to step S501. In step S501, the control device 15 refers to the on-off valve-space allocation table and the flow path resistance stored in the flow path resistance memory unit 23, and obtains the flow path resistance of the heat dissipation circuit 60 including the on-off valve 40 corresponding to the heated space 2 (hereinafter referred to as the heat dissipation circuit 60 of the heated space 2). The flow path resistances of the heat dissipation circuits 60 of the heated space 2 are compared, and the on-off valve 40 of the heat dissipation circuit 60 with the largest flow path resistance is set to a constantly open state. Here, the heat dissipation circuit 60 with the largest flow path resistance is the second heat dissipation circuit 60b, and the second on-off valve 40b is set to a constantly open state. The on-off valve 40 of the heat dissipation circuit 60 in which the flow resistance is smaller than that of the second heat dissipation circuit 60b, that is, the heat dissipation circuit 60 in which the water heat transfer medium flows more easily when the on-off valve 40 is always open, determines the on-off period of the on-off valve 40 by using the ratio of the flow resistance of each heat dissipation circuit 60 so that the amount of water heat transfer medium flowing in each heat dissipation circuit 60 is the same as that in the second heat dissipation circuit 60b. Even if the flow rate of the water heat transfer medium flowing in each heat dissipation circuit 60 is not the same as that of the water heat transfer medium flowing in the second heat dissipation circuit 60b, as long as the difference between the flow rate of the water heat transfer medium flowing in the second heat dissipation circuit 60b and the flow rate of the water heat transfer medium flowing in the second heat dissipation circuit 60b is within a predetermined range (for example, a range of 80% to 120% of the flow rate of the water heat transfer medium flowing in the second heat dissipation circuit 60b), the effect of suppressing temperature unevenness due to heating can be obtained. A method of determining the on-off period of the on-off valve 40 will be described later. Next, proceed to step S502.

[0056] Here, FIG. 10 is a graph showing the relationship between room temperature and floor temperature and time when control is performed based on flow resistance, and a timing chart showing the control of the on-off valve 40. In the graph showing the relationship between room temperature and floor temperature and time in FIG. 10, when the heated water heat transfer medium flows through the heat dissipation circuit 60 of the heating space 2, the heating space 2 is heated, and the room temperature detected by the room temperature detection unit 5 installed in the heating space 2 rises. In addition, when the radiator 50 is a floor heating panel, the floor temperature where the first radiator 50a is installed is set to B1, and the floor temperature where the second radiator 50b is installed is set to B2, and the graph in FIG. 10 shows the transition of the floor temperature together with the room temperature. By determining the opening and closing cycle of the on-off valve 40 in step S501, the first on-off valve 40a opens and closes, and the flow rate of the water heat transfer medium in the first heat dissipation circuit 60a is suppressed compared to when the first on-off valve 40a is always open. By determining the opening and closing cycle of the on-off valve 40 using the ratio between the flow resistance of the first heat dissipation circuit 60a and the flow resistance of the second heat dissipation circuit 60b, the flow rate of the water heat transfer medium flowing through the first heat dissipation circuit 50a and the second heat dissipation circuit 50b can be kept the same, or the difference between the amount of the water heat transfer medium flowing through the first heat dissipation circuit 50a and the amount of the water heat transfer medium flowing through the second heat dissipation circuit 50b can be kept within a predetermined range. Therefore, the first heat dissipation circuit 50a and the second heat dissipation circuit 50b produce the same heating effect, and as shown in the graph of FIG. 10, the bed temperature B1 and the bed temperature B2 rise equally in temperature.

[0057] Next, in step S502, the control device 15 obtains the room temperature detected by the room temperature detection unit 5 installed in the heated space 2 and compares it with the upper limit of the set temperature range. In Fig. 10, the room temperature reaches the upper limit of the set temperature range at time T3. If the room temperature is higher than the upper limit of the set temperature range, the process proceeds to step S503. Otherwise, that is, if the room temperature is lower than or equal to the upper limit of the set temperature range, the process proceeds to step S506.

[0058] Next, in step S503, the control device 15 acquires the state of the second on-off valve 40b and determines whether it is in the open state. If it is in the open state, the process proceeds to step S504. Otherwise, that is, if it is in the closed state or in the opening / closing operation, the process proceeds to step S506.

[0059] Next, in step S504, the control device 15 starts the opening and closing operation of the second on-off valve 40b. At this time, the opening and closing cycle of the second on-off valve 40b is a predetermined constant cycle. Alternatively, the opening and closing cycle may be changed depending on the temperature of the circulating water heat transfer medium detected by the water heat transfer medium temperature detection unit 14, for example, by lengthening the closed state when the temperature is high. At the time of step S504, the room temperature has reached the upper limit of the set temperature range as shown at time T3 in FIG. 10, and is therefore in an overheated state. Therefore, the amount of water heat transfer medium flowing through the second heat dissipation circuit 60b is suppressed by controlling the second on-off valve 40b, thereby reducing the heating effect. Next, proceed to step S505.

[0060] Next, in step S505, the opening and closing cycle of the on-off valve 40 of the heat dissipation circuit 60 whose flow path resistance value is smaller than that of the second heat dissipation circuit 60b is determined according to the opening and closing cycle of the second on-off valve 40b operated in step S504. The opening and closing cycle of the on-off valve 40 is determined so that the amount of water heat medium flowing in each heat dissipation circuit 60 is the same as that in the second heat dissipation circuit 60b using the ratio of the flow path resistance of each heat dissipation circuit 60. Alternatively, the opening and closing cycle of the on-off valve 40 is determined so that the difference between the amount of water heat medium flowing in each heat dissipation circuit 60 and the flow rate of the water heat medium flowing in the second heat dissipation circuit 60b is within a predetermined range. A method for determining the opening and closing cycle of the on-off valve 40 will be described later. As shown from time T3 to T4 in FIG. 10, the second on-off valve 40b is opened and closed, and the opening and closing cycles of the other on-off valves 40 are also changed, so that the amount of water heat medium flowing in the heat circuit is reduced, the heating effect is suppressed, and the room temperature of the heated space 2 drops due to the influence of the outside air temperature. In order to reduce the amount of water heat transfer medium flowing through the heat dissipation circuit 60 in order to suppress the heating effect, all of the on-off valves 40 corresponding to the heating space 2 may be closed while the room temperature exceeds the upper limit of the set temperature range. Next, proceed to step S506.

[0061] In step S506, the control device 15 obtains the room temperature detected by the room temperature detection unit 5 installed in the heated space 2 and compares it with the lower limit of the set temperature range. In Fig. 10, the room temperature reaches the lower limit of the set temperature range at time T4. If the room temperature is lower than the lower limit of the set temperature range, the process proceeds to step S507. Otherwise, that is, if the room temperature is higher than or equal to the lower limit of the set temperature range, the process proceeds to step S510.

[0062] Next, in step S507, the control device 15 acquires the state of the second on-off valve 40b and determines whether it is in the open state. If it is in the open state, the process proceeds to step S510. Otherwise, that is, if it is in the closed state or in the process of opening and closing, the process proceeds to step S508.

[0063] Next, in step S508, the controller 15 opens the second on-off valve 40b, and then the process proceeds to step S509.

[0064] Next, in step S509, similarly to step S501, the opening and closing cycle of the on-off valve 40 of the heat dissipation circuit 60 installed in the heated space 2 having a smaller flow path resistance value than the second heat dissipation circuit 60b is determined using the flow path resistance ratio of each heat dissipation circuit 60 so that the amount of water heat medium flowing in each heat dissipation circuit 60 is the same as that in the second heat dissipation circuit 60b. Alternatively, the opening and closing cycle of the on-off valve 40 is determined so that the difference between the amount of water heat medium flowing in each heat dissipation circuit 60 and the flow rate of the water heat medium flowing in the second heat dissipation circuit 60b is within a predetermined range.

[0065] At the time of step S508, the room temperature is lower than the lower limit of the set temperature range, as shown at time T4 in Fig. 10. By the processes of steps S508 and S509, the amount of water heat transfer medium flowing to the radiator 50 installed in the heating space 2 increases, the heating effect increases, and the room temperature rises. Next, the process proceeds to step S510.

[0066] Next, in step S510, the control device 15 determines whether a stop operation has been performed from the remote control 6. If a stop operation has been performed, the control device 15 stops the heating device 12 and closes the on-off valve 40 in order to stop the heating of the heated space 2, although this is not shown in the figure. If the heating device 12 cannot be stopped because a heating space 2 other than the controlled space is being heated, the on-off valve 40 corresponding to the controlled heating space 2 is closed, so that the water heat transfer medium does not flow to the radiator 50 installed in the controlled heating space 2, and only the heating of the heated space 2 can be stopped. If a stop operation has not been performed, the process returns to step S502, and control of the on-off valve 40 according to the room temperature is repeated.

[0067] As described above, in temperature control by opening and closing the on-off valve 40, the on-off valve 40 is controlled to open and close depending on the flow resistance of each heat dissipation circuit 60, and the flow rate of the water heat transfer medium flowing through each heat dissipation circuit 60 is made equal, so that the temperature rise of the radiator 50 can be made equal as shown in Fig. 10. Therefore, no temperature unevenness occurs in the heated space 2, and user convenience is increased.

[0068] Next, a specific procedure for determining the opening and closing cycle of the on-off valve 40 from the estimated flow resistance of the heat dissipation circuit 60 will be described. Equation 1 is established when the pressure loss of the heat dissipation circuit 60 is P, the flow resistance is C, and the flow rate of the water heat transfer medium, i.e., the volume of the water heat transfer medium flowing through the heat dissipation circuit 60 per unit time, is Q. Note that n is a coefficient that changes depending on the state of turbulence generated by the shape of the piping of the heat dissipation circuit 60, and can take a value of 1 to 2. It has been experimentally found that n is approximately 1.75 when the radiator 50 is a floor heating panel.

[0069]

number

[0070] When the pressure for circulating the water-based heat transfer medium generated by the circulation device 13 is constant, it can be seen from Equation 1 that the smaller the flow path resistance C, the greater the flow rate Q of the water-based heat transfer medium, and the greater the flow path resistance C, the smaller the flow rate Q of the water-based heat transfer medium.

[0071] 1, the first flow resistance of the first heat dissipation circuit 60a is C1, the flow rate of the water heat transfer medium per unit time is Q1, the second flow resistance of the second heat dissipation circuit 60b is C2, and the flow rate of the water heat transfer medium per unit time is Q2. The first heat dissipation circuit 60a including the first radiator 50a has a smaller flow resistance than the second heat dissipation circuit 60b including the second radiator 50b. Therefore, C1<C2のため、Q1> As a result, the first heat dissipation circuit 60a flows more water heat transfer medium than the second heat dissipation circuit 60b, and the first radiator 50a dissipates more heat than the second radiator 50b.

[0072] To suppress the difference in warming between the first radiator 50a and the second radiator 50b, the flow rate of the water heat transfer medium flowing through the radiator circuit 60 having the smaller flow resistance is suppressed by controlling the on-off valve 40 arranged in the radiator circuit 60 having the smaller flow resistance between the first and second flow resistances. Therefore, the ratio between the first and second flow resistances is calculated, and the opening and closing cycle of the on-off valve 40 is determined according to the ratio of the flow resistances.

[0073] Since the pressures applied to the first heat dissipation circuit 60a and the second heat dissipation circuit 60b are equal, the flow resistance and flow rate in the two heat dissipation circuits are expressed by Q2=Q1×(C1 / C2)^(1 / n) using Equation 1. The flow rate when the on-off valve 40 is opening and closing is proportional to the length of time that the on-off valve 40 is open. Therefore, by controlling the first on-off valve 40a and the second on-off valve 40b so that the ratio of the length of time that the first on-off valve 40a connected to the first heat dissipation circuit 60a is open to the length of time that the second on-off valve 40b connected to the second heat dissipation circuit 60b is open is (C1 / C2)^(1 / n):1, the total amount of water heat transfer medium flowing through the first heat dissipation circuit 60a and the second heat dissipation circuit 60b can be made the same.

[0074] Even if the flow rate of the water heating medium flowing through the first heat dissipation circuit 60a is not the same as the flow rate of the water heating medium flowing through the second heat dissipation circuit 60b, the effect of suppressing temperature unevenness due to heating can be obtained as long as the difference between the flow rates of the water heating medium flowing through the first heat dissipation circuit 60a and the second heat dissipation circuit 60b is within a predetermined range. For example, it is assumed that it is known that if the difference between the flow rates of the water heating medium flowing through the first heat dissipation circuit 60a and the second heat dissipation circuit 60b is within 20% of the flow rate of the water heating medium flowing through the second heat dissipation circuit 60b, temperature unevenness due to the heating capacity of the first radiator 50a and the second radiator 50b can be suppressed to a level that is not noticeable to the user. In this case, when the length of time that the second on-off valve 40b connected to the second heat dissipation circuit 60b is in an open state is taken as 1, the length of time that the first on-off valve 40a connected to the first heat dissipation circuit 60a is in an open state is controlled to be (C1 / C2)^(1 / n)×0.8 to (C1 / C2)^(1 / n)×1.2, thereby suppressing temperature unevenness. By providing a margin to the allowable range of the flow rate of the water heat transfer medium flowing through the first heat dissipation circuit 60a, the on-off valve control unit 26 does not need to strictly control the opening and closing cycle of the first on-off valve 40a, making control easier.

[0075] The allowable range of the flow rate of the water heating medium flowing through the first heat dissipation circuit 60a may be set by the remote control 6. The allowable range of the flow rate of the water heating medium flowing through the other heat dissipation circuits 60 (here, the first heat dissipation circuit 60a) can be set as a percentage, assuming that the flow rate of the heat dissipation circuit 60 (here, the second heat dissipation circuit 60b) through which the water heating medium has the largest relative flow resistance and is difficult to flow is 100%. If the hot water heating device 10 is installed and the user actually uses it and feels that the temperature unevenness due to heating for each radiator 50 is large, the user operates the remote control 6 to set the allowable range of the flow rate to a range closer to 100%. This reduces the difference in the flow rate of the water heating medium for each heat dissipation circuit 60, and reduces the temperature unevenness due to heating for each radiator 50. Therefore, the comfort of the user is not impaired.

[0076] FIG. 11 is a timing chart showing the control of the on-off valve 40 using the flow resistance (when the second on-off valve 40b is always open). In FIG. 11, T is a preset period, and the time during which the on-off valve 40 is open during the period T is calculated from the flow resistance ratio, and the on-off valve 40 repeats the opening and closing operation during the period T until the next process of determining the opening and closing cycle of the on-off valve 40 is performed. The process of determining the opening and closing cycle of the on-off valve 40 corresponds to steps S501, S505, and S509 in FIG. 9. For example, a case where n=1.75 and the value of (C1 / C2)^(1 / 1.75) is 0.5 will be described. When the second on-off valve 40b of the second heat dissipation circuit 60b having a large flow resistance is always open, the time during which the first on-off valve 40a is open is controlled to be 0.5 times that of the second on-off valve 40b. In FIG. 11, since the second on-off valve 40b is normally open, if the time during which the first on-off valve 40a is open during the period T is To and the time during which it is closed is Tc, then To is 0.5 times T.

[0077] 12 is a timing chart showing the control of the on-off valve 40 using the flow path resistance (when the second on-off valve 40b is in an opening / closing operation). When the second on-off valve 40b of the second heat dissipation circuit 60b having a large flow path resistance is opening and closing, the opening time of the first on-off valve 40a during the period T is To1, the closing time is Tc1, and the opening time of the second on-off valve 40b during the period T is To2, and the closing time is Tc2, the opening and closing cycle of the first on-off valve 40a is determined so that To1 is 0.5 times Tc2.

[0078] 11 and 12, the first on-off valve 40a and the second on-off valve 40b periodically open and close, but the time To1 during which the first on-off valve 40a is open during a preset period T should be (C1 / C2)^(1 / 1.75) times the time Tc2 during which the second on-off valve 40b is open. In other words, To1 and Tc2 are expressed by Equation 2.

[0079]

number

[0080] In this way, by determining the opening and closing period of the on-off valve 40 using the flow resistance of each heat dissipation circuit 60, the flow rate of the water heat transfer medium flowing through each heat dissipation circuit 60 can be controlled to be the same, thereby obtaining a heating device that suppresses differences in heating speed between each heat dissipation circuit.

[0081] The on-off valve 40 may be an on-off valve that can adjust the flow rate of the water heat transfer medium flowing through the piping by changing the opening degree, in addition to the open and closed states. In this case, when the opening degree of the on-off valve installed in the heat dissipation circuit with high flow resistance is set to 1, the opening degree of the on-off valve installed in the heat dissipation circuit with low flow resistance is set to (C1 / C2)^(1 / 1.75) times.

[0082] As described above, the hot water heating device 10 according to this embodiment has a first radiator 50a that heats a space by radiating heat from a water heat medium, a first heat radiation circuit 60a in which the water heat medium circulates, a second radiator 50b that is connected in parallel with the first radiator 50a and heats a space by radiating heat from the water heat medium, a second heat radiation circuit 60b in which the water heat medium circulates, a first on-off valve 40a that is disposed in the first heat radiation circuit 60a and that adjusts the flow rate of the water heat medium flowing in the first heat radiation circuit 60a, and a water heater 40a that is disposed in the second heat radiation circuit 60b and that adjusts the flow rate of the water heat medium flowing in the second heat radiation circuit 60b. The system includes a second on-off valve 40b for adjusting the flow rate of the heat medium, a circulation device 13 for circulating the water heat medium through the first heat dissipation circuit 60a and the second heat dissipation circuit 60b, a heating device 12 for heating the water heat medium, and a control device 15 for controlling the first on-off valve 40a and the second on-off valve 40b so that the difference between the flow rate of the water heat medium flowing in the first heat dissipation circuit 60a and the flow rate of the water heat medium flowing in the second heat dissipation circuit 60b is within a predetermined range based on the ratio between a first flow path resistance which is the flow path resistance of the first heat dissipation circuit 60a and a second flow path resistance which is the flow path resistance of the second heat dissipation circuit 60b.

[0083] By controlling the on-off valve 40 using the flow path resistance ratio in this way, the difference in the flow rate of the water heat transfer medium for each heat dissipation circuit 60 due to the difference in flow path resistance can be kept within a predetermined range, thereby obtaining a heating device that suppresses the difference in the heating method for each heat dissipation circuit 60. Furthermore, by using the flow path resistance ratio, it is possible to control the on-off valve 40 so that the heating capacity of each heat dissipation circuit 60 is equal, even if a temperature sensor is not installed near each radiator 50.

[0084] Furthermore, the control device 15 estimates the first flow path resistance and the second flow path resistance based on the circulation device performance information 22 indicating the performance of the circulation device 13. In this way, by estimating the flow path resistance of each heat dissipation circuit 60, it is possible to obtain a more accurate flow path resistance of each heat dissipation circuit 60 than by calculating the flow path resistance from the size of the radiator 50.

[0085] Furthermore, the circulation device 13 is a pump driven by a motor, and the circulation device performance information 22 is a table showing the relationship between the power consumption when the motor driving the circulation device 13 is operated at a constant rotation speed and the flow path resistance of the path through which the water heat transfer medium circulates, connected to the circulation device 13. This makes it possible to easily estimate the flow path resistance by operating the motor of the pump, which is the circulation device 13, at a constant rotation speed and acquiring the power consumption at that time.

[0086] In addition, the control device 15 determines the opening and closing cycle of the first on-off valve 40a based on the ratio between the first flow path resistance and the second flow path resistance. This makes it possible to reduce the flow rate of the water heat transfer medium flowing through the first heat dissipation circuit 60a, thereby obtaining a heating device that reduces the difference in heating speed between the heat dissipation circuits 60.

[0087] Furthermore, the control device 15 determines the time for which the first on-off valve 40a is open and the time for which the second on-off valve 40b is open during a preset period based on the ratio between the first flow path resistance and the second flow path resistance. This makes it possible to reduce the flow rate of the water heat transfer medium flowing through the first heat dissipation circuit 60a, thereby obtaining a heating device that reduces the difference in heating speed between the heat dissipation circuits 60.

[0088] Furthermore, the control device 15 controls the first on-off valve 40a and the second on-off valve 40b based on the ratio between the first flow path resistance and the second flow path resistance so that the flow rates of the water heat transfer medium flowing through the first heat dissipation circuit 60a and the second heat dissipation circuit 60b are the same. This makes it possible to equalize the temperature rises in the first radiator 50a and the second radiator 50b. This prevents temperature unevenness in the heated space 2, improving user convenience.

[0089] In addition, the control device 15 uses the first flow resistance C1 and the second flow resistance C2 to control the time To1 during which the first on-off valve 40a is open during a preset period and the time To2 during which the second on-off valve 40b is open during a period so as to satisfy the following formula (1). This makes it possible to equalize the temperature rises of the first radiator 50a and the second radiator 50b. This prevents temperature unevenness from occurring in the heated space 2, improving user convenience.

[0090]

number

[0091] The control method for the hot water heating device 10 according to the present embodiment includes a first heat radiator 50a that heats a space by radiating heat from a water heat medium, a first heat radiating circuit 60a in which the water heat medium circulates, a second heat radiator 50b that is connected in parallel with the first radiator 50a and heats a space by radiating heat from the water heat medium, a second heat radiating circuit 60b in which the water heat medium circulates, a first on-off valve 40a that is disposed in the first heat radiating circuit 60a and that adjusts the flow rate of the water heat medium flowing in the first heat radiating circuit 60a, a second on-off valve 40b that is disposed in the second heat radiating circuit 60b and that adjusts the flow rate of the water heat medium flowing in the second heat radiating circuit 60b, and a control circuit between the first heat radiating circuit 60a and the second heat radiating circuit 60b. The control method for a hot water heating device 10 is characterized in that it comprises a circulation device 13 that circulates a water heat transfer medium through the first heat dissipation circuit 60a and the second heat dissipation circuit 60b, a heating device 12 that heats the water heat transfer medium, and a control device 15 that stores a first flow path resistance that is the flow path resistance of the first heat dissipation circuit 60a and a second flow path resistance that is the flow path resistance of the second heat dissipation circuit 60b, and the control device 15 includes a step of determining a control method for the first on-off valve 40a and the second on-off valve 40b based on the ratio between the first flow path resistance and the second flow path resistance so that the difference between the flow rate of the water heat transfer medium flowing in the first heat dissipation circuit 60a and the flow rate of the water heat transfer medium flowing in the second heat dissipation circuit 60b is within a predetermined range.

[0092] In this way, based on the ratio between the first flow path resistance and the second flow path resistance, the difference in the flow rate of the water heat transfer medium for each heat dissipation circuit 60 due to the difference in flow path resistance can be kept within a predetermined range, and a heating device can be obtained in which the difference in heating rate for each heat dissipation circuit 60 is suppressed.

[0093] Embodiment 2 Next, a description will be given of embodiment 2. Note that, in this embodiment, the description of the same parts as those in the above-mentioned embodiment will be omitted.

[0094] In this embodiment, the circulation device performance information 22 used to estimate the flow path resistance is different from that in embodiment 1. The circulation device performance information 22 in this embodiment is a rotation speed-flow path resistance table showing the relationship between the rotation speed of the motor and the value of the flow path resistance of the circulation path of the water heat transfer medium connected to the circulation device 13 at that time.

[0095] FIG. 13 is a graph showing the performance curve of the circulation device 13 and the resistance curve of the circulation path 16. In FIG. 13, the performance curve D is a performance curve showing the relationship between the head and the flow rate when the motor of the pump, which is the circulation device 13, is driven without controlling the rotation speed. The resistance curve R (R1, R2) is a resistance curve showing the pressure loss of the circulation path 16 connected to the circulation device 13, R1 is a resistance curve when the circulation path 16 is the first heat dissipation circuit 60a, and R2 is a resistance curve when the circulation path 16 is the second heat dissipation circuit 60b. The flow path resistance of the first heat dissipation circuit 60a is smaller than the flow path resistance of the second heat dissipation circuit 60b. If the flow path resistance is small, the pressure loss is small even with the same flow rate, so the slope of the resistance curve is small. The intersection of the resistance curve R and the performance curve D is the operating point of the circulation device 13. It can be seen from FIG. 13 that the flow rate Q1 at the operating point P1 of the first heat dissipation circuit 60a is greater than the flow rate Q2 at the operating point P2 of the second heat dissipation circuit 60b.

[0096] Since the flow rate of the circulation device 13 is proportional to the rotation speed of the motor, the flow rate at that time can be obtained from the rotation speed when the circulation device 13 is operating. Therefore, when the circulation device 13 is operating, the flow rate can be obtained from the rotation speed of the circulation device 13, and it is possible to know at which operating point on the performance curve D the circulation device 13 is operating. If the flow path resistance of the resistance curve that intersects with the operating point on the performance curve D is known, the flow path resistance can be obtained from the rotation speed of the circulation device 13. In other words, when the circulation device 13 is operated without controlling the rotation speed, the rotation speed of the motor is determined by the flow path resistance. Therefore, the rotation speed of the circulation device 13 when it is operated by changing the flow path resistance experimentally in advance is obtained, a rotation speed-flow path resistance table is created, and is stored in the control device 15.

[0097] Next, a method for estimating the flow path resistance of each heat dissipation circuit 60 using a rotation speed-flow path resistance table, which is the circulation device performance information 22, will be described. In this embodiment, the flow path resistance of each heat dissipation circuit 60 is estimated during a test run, as in embodiment 1, and the test run is performed according to the flow of Fig. 4, as in embodiment 1. In this embodiment, the flow path resistance estimation process in step S206 in Fig. 4 differs from embodiment 1. Therefore, a description of the flow other than the overlapping step S206 in Fig. 4 will be omitted.

[0098] Fig. 14 is a flow chart showing a method for measuring the flow resistance of the heat dissipation circuit 60 in the second embodiment. In this embodiment, step S206 implements the flow of Fig. 14. First, in step S601, the operation control unit 32 of the control device 15 operates the circulation device 13. At this time, the motor is operated without controlling the rotation speed. Next, the process proceeds to step S602.

[0099] In step S602, the rotation speed acquisition unit 34 of the control device 15 acquires the rotation speed of the motor of the circulation device 13. At this time, in order to wait until the circulation device 13 operates stably, the rotation speed of the motor of the circulation device 13 may be acquired after a certain period of time has elapsed. Next, the process proceeds to step S603.

[0100] In step S603, the flow path resistance estimation unit 28 refers to the rotation speed-flow path resistance table, which is the circulation device performance information 22 stored in the memory 20, and acquires the flow path resistance corresponding to the rotation speed acquired in step S602. Next, the process proceeds to step S604.

[0101] In step S604, the flow path resistance acquired in step S603 is stored in the flow path resistance storage unit 23 of the control device 15. The target heat dissipation circuit 60, i.e., the on-off valve 40 and the heat dissipation circuit 60 in which the on-off valve 40 is open at this time, and the flow path resistance are associated and stored. This completes the estimation of the flow path resistance of the heat dissipation circuit 60 in step S206.

[0102] In this embodiment, the control of the on-off valve 40 according to the flow resistance of each heat dissipation circuit 60 is performed as shown in Fig. 9, similarly to the first embodiment. Therefore, the flow rate of the water heat transfer medium flowing through each heat dissipation circuit 60 can be controlled to be the same, and a hot water heating device 10 can be obtained in which the difference in the heating speed between the heat dissipation circuits 60 is suppressed.

[0103] As described above, the hot water heating device 10 according to this embodiment has a first radiator 50a that heats a space by radiating heat from a water heat medium, a first heat radiation circuit 60a in which the water heat medium circulates, a second radiator 50b that is connected in parallel with the first radiator 50a and heats a space by radiating heat from the water heat medium, a second heat radiation circuit 60b in which the water heat medium circulates having a larger flow resistance than the first heat radiation circuit 60a, a first on-off valve 40a that is disposed in the first heat radiation circuit 60a and that adjusts the flow rate of the water heat medium flowing in the first heat radiation circuit 60a, a second on-off valve 40b that is disposed in the second heat radiation circuit 60b and that adjusts the flow rate of the water heat medium flowing in the second heat radiation circuit 60b, and a control circuit for controlling the flow rate of the water heat medium between the first heat radiation circuit 60a and the second heat radiation circuit 60b. The system comprises a circulation device 13 for circulating the water heat transfer medium through the first heat dissipation circuit 60a and the second heat dissipation circuit 60b, a heating device 12 for heating the water heat transfer medium, and a control device 15 for controlling the first on-off valve 40a and the second on-off valve 40b so that the difference between the flow rate of the water heat transfer medium flowing through the first heat dissipation circuit 60a and the flow rate of the water heat transfer medium flowing through the second heat dissipation circuit 60b is within a predetermined range based on the ratio between a first flow path resistance which is the flow path resistance of the first heat dissipation circuit 60a and a second flow path resistance which is the flow path resistance of the second heat dissipation circuit 60b, wherein the circulation device 13 is a pump driven by a motor, and the circulation device performance information 22 is a table showing the relationship between the motor rotation speed and the flow path resistance when the circulation device 13 is driven without controlling the rotation speed.

[0104] This makes it possible to easily estimate the flow path resistance by acquiring the rotation speed of the motor of the pump, which is the circulation device 13.

[0105] The configurations shown in the above embodiments are examples of the contents of the present invention, and may be combined with other known technologies. Parts of the configurations may be omitted or modified without departing from the gist of the present invention.

[0106] Below, examples of aspects that may be included in the present disclosure are set forth as appendices. (Appendix 1) A first heat dissipation circuit includes a first radiator that heats a space by dissipating heat from a water heat transfer medium, and in which the water heat transfer medium circulates; A second heat dissipation circuit in which the water heat transfer medium circulates, the second heat dissipation circuit having a second heat dissipation circuit that is connected in parallel with the first heat dissipation circuit and that heats the space by dissipating heat from the water heat transfer medium; a first on-off valve disposed in the first heat dissipation circuit and configured to adjust the flow rate of the water heat transfer medium flowing through the first heat dissipation circuit; a second on-off valve arranged in the second heat dissipation circuit and configured to adjust the flow rate of the water heat transfer medium flowing through the second heat dissipation circuit; a circulation device that circulates a water heat transfer medium through the first heat dissipation circuit and the second heat dissipation circuit; A heating device for heating the water heat transfer medium; a control device that controls the first on-off valve and the second on-off valve so that a difference between a flow rate of the water heat transfer medium flowing through the first heat dissipation circuit and a flow rate of the water heat transfer medium flowing through the second heat dissipation circuit is within a predetermined range based on a ratio between a first flow resistance that is a flow resistance of the first heat dissipation circuit and a second flow resistance that is a flow resistance of the second heat dissipation circuit; A hot water heating device comprising: (Appendix 2) The hot water heating device described in Appendix 1, characterized in that the control device estimates the first flow path resistance and the second flow path resistance based on circulation device performance information representing the performance of the circulation device. (Appendix 3) The circulation device is a pump driven by a motor, The hot water heating device described in Appendix 2, characterized in that the circulation device performance information is a table showing the relationship between the power consumption of the motor driving the circulation device when the motor is operated at a constant rotation speed and the flow path resistance of the path through which the water heat transfer medium circulates, connected to the circulation device. (Appendix 4) The circulation device is a pump driven by a motor, The hot water heating device described in Appendix 2, characterized in that the circulation device performance information is a table showing the relationship between the motor's rotation speed and flow path resistance when the circulation device is driven without controlling the rotation speed. (Appendix 5) The first on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the first heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the first heat dissipation circuit, The second on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the second heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the second heat dissipation circuit, The hot water heating device according to any one of claims 1 to 4, wherein the control device determines an opening and closing cycle of the first on-off valve based on a ratio between the first flow path resistance and the second flow path resistance. (Appendix 6) The first on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the first heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the first heat dissipation circuit, The second on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the second heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the second heat dissipation circuit, The hot water heating device according to any one of claims 1 to 5, wherein the control device determines the time for which the first on-off valve is open and the time for which the second on-off valve is open during a preset period based on a ratio between the first flow path resistance and the second flow path resistance. (Appendix 7) A hot water heating device as described in any one of Appendices 1 to 6, wherein the control device controls the first on-off valve and the second on-off valve based on a ratio between the first flow path resistance and the second flow path resistance so that the flow rate of the water heat transfer medium flowing in the first heat dissipation circuit and the second heat dissipation circuit is the same. (Appendix 8) The first on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the first heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the first heat dissipation circuit, The second on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the second heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the second heat dissipation circuit, The hot water heating device described in Appendix 7, characterized in that the control device uses the first flow path resistance C1 and the second flow path resistance C2 to control a time To1 during which the first on-off valve is open in a preset period and a time To2 during which the second on-off valve is open in the period so as to satisfy the following formula (1).

[0107]

number

[0108] 1 hot water heat source unit, 2 heating space, 5 room temperature detection unit, 6 remote control, 10 hot water heating device, 11 cistern tank, 12 heating device, 13 circulation device, 14 water heat medium temperature detection unit, 15 control device, 16 circulation path, 20 memory, 21 on-off valve-space table, 22 circulation device performance information, 23 flow path resistance memory unit, 24 operation information acquisition unit, 25 room temperature acquisition unit, 26 on-off valve control unit, 27 water temperature control unit, 30 circulation device control unit, 31 rotation speed control unit, 32 operation control unit, 33 power consumption acquisition unit, 34 rotation speed acquisition unit, 40 on-off valve, 40a first on-off valve, 40b second on-off valve, 50 radiator, 50a first radiator, 50b second radiator, 60 heat dissipation circuit, 60a first heat dissipation circuit, 60b second heat dissipation circuit.

Claims

1. A first heat dissipation circuit includes a first radiator that heats a space by dissipating heat from a water heat transfer medium, and in which the water heat transfer medium circulates; A second heat dissipation circuit connected in parallel to the first heat dissipator and having a second heat dissipator that heats the space by dissipating heat from the water heat transfer medium, in which the water heat transfer medium circulates; a first on-off valve arranged in the first heat dissipation circuit and configured to adjust the flow rate of the water heat transfer medium flowing through the first heat dissipation circuit; a second on-off valve arranged in the second heat dissipation circuit and configured to adjust the flow rate of the water heat transfer medium flowing through the second heat dissipation circuit; a circulation device that circulates a water heat transfer medium through the first heat dissipation circuit and the second heat dissipation circuit; A heating device for heating the water heat transfer medium; a control device that controls the first on-off valve and the second on-off valve so that a difference between a flow rate of the water heat transfer medium flowing through the first heat dissipation circuit and a flow rate of the water heat transfer medium flowing through the second heat dissipation circuit is within a predetermined range based on a ratio between a first flow resistance that is a flow resistance of the first heat dissipation circuit and a second flow resistance that is a flow resistance of the second heat dissipation circuit; A hot water heating device comprising:

2. The hot water heating apparatus according to claim 1 , wherein the control device estimates the first flow path resistance and the second flow path resistance based on circulation device performance information indicating a performance of the circulation device.

3. The circulation device is a pump driven by a motor, The hot water heating device described in claim 2, characterized in that the circulation device performance information is a table showing the relationship between the power consumption of the motor driving the circulation device when the motor is operated at a constant rotation speed and the flow path resistance of the path through which the water heat transfer medium circulates, connected to the circulation device.

4. The circulation device is a pump driven by a motor, The hot water heating apparatus according to claim 2, characterized in that the circulation device performance information is a table showing the relationship between the rotation speed of the motor and the flow path resistance when the circulation device is driven without controlling the rotation speed.

5. The first on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the first heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the first heat dissipation circuit, The second on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the second heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the second heat dissipation circuit, The hot water heating device according to claim 1 , wherein the control device determines an opening and closing cycle of the first on-off valve based on a ratio between the first flow path resistance and the second flow path resistance.

6. The first on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the first heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the first heat dissipation circuit, The second on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the second heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the second heat dissipation circuit, 5. The hot water heating device according to claim 1, wherein the control device determines the time for which the first on-off valve is open and the time for which the second on-off valve is open during a preset period based on the ratio between the first flow path resistance and the second flow path resistance.

7. A hot water heating device as described in any one of claims 1 to 4, wherein the control device controls the first on-off valve and the second on-off valve so that the flow rate of the water heat transfer medium flowing in the first heat dissipation circuit and the second heat dissipation circuit is the same based on the ratio between the first flow path resistance and the second flow path resistance.

8. The first on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the first heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the first heat dissipation circuit, The second on-off valve performs an opening and closing operation to switch between an open state in which the water heat transfer medium flows through the second heat dissipation circuit and a closed state in which the water heat transfer medium does not flow through the second heat dissipation circuit, The hot water heating device according to claim 7, characterized in that the control device uses the first flow path resistance C1 and the second flow path resistance C2 to control the time To1 during which the first on-off valve is open during a preset period and the time To2 during which the second on-off valve is open during the period so as to satisfy the following formula (1). [0010]

9. a first heat dissipation circuit having a first radiator that heats a space by dissipating heat from a water heat medium, and through which the water heat medium circulates; a second heat dissipation circuit having a second radiator connected in parallel to the first radiator and that heats a space by dissipating heat from the water heat medium, and through which the water heat medium circulates; a first on-off valve disposed in the first heat dissipation circuit and that adjusts a flow rate of the water heat medium flowing through the first heat dissipation circuit; a second on-off valve disposed in the second heat dissipation circuit and that adjusts a flow rate of the water heat medium flowing through the second heat dissipation circuit; a circulator that circulates the water heat medium between the first heat dissipation circuit and the second heat dissipation circuit; a heating device that heats the water heat medium; and a control device that stores a first flow resistance that is a flow resistance of the first heat dissipation circuit and a second flow resistance that is a flow resistance of the second heat dissipation circuit, A control method for a hot water heating device, comprising a step in which the control device determines a control method for the first on-off valve and the second on-off valve based on a ratio between the first flow path resistance and the second flow path resistance so that the difference between the flow rate of the water heat transfer medium flowing in the first heat dissipation circuit and the flow rate of the water heat transfer medium flowing in the second heat dissipation circuit is within a predetermined range.

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