JP7154153B2 - hot water heating system - Google Patents

Description

The present invention relates to hot water heating systems.

2. Description of the Related Art For a hot water heating system in which hot water heated by a heat source machine is circulated between a heat source machine and a heating radiator, a technique disclosed in Patent Document 1, for example, is conventionally known. With this technology, a map (matrix diagram) is created in advance to determine the target hot water supply temperature (the target value for the temperature of hot water supplied from the heat source equipment to the heating radiator) from the residential heat radiation coefficient and the required heating output. During the actual heating operation, the house heat radiation coefficient is estimated using the detected values of the temperature and flow rate of the hot water when the temperature of the hot water is stable. Further, the required heating output is obtained from the difference between the set room temperature and the detected value of the outside air temperature and the estimated value of the residential heat radiation coefficient. Then, the target hot water supply temperature determined based on the above map is obtained from these residential heat radiation coefficients and required heating output values, and the heat source equipment is operated (heating control of hot water) so as to realize this target hot water supply temperature. done.

JP 2009-281666 A

With the technique disclosed in Patent Document 1, creating the map tends to take a lot of man-hours, and it is difficult to create the map by reflecting the influence of variations in heat dissipation characteristics of individual heating radiators. . Therefore, even if the heat source equipment is operated so as to achieve the target hot water supply temperature determined by the map, the heating output tends to be excessive or insufficient due to the influence of variations in the heat dissipation characteristics of each heating radiator. As a result, the actual room temperature tends to deviate from the set room temperature.

Here, in the technique seen in Patent Document 1, in a state in which the hot water is heated by the heat source device so as to achieve the target hot water supply temperature obtained from the map as described above, the actual temperature and flow rate of the hot water are detected. A heating output is calculated, and if this heating output differs from the required heating output calculated using the residential heat radiation coefficient, the target hot water going temperature is corrected to increase or decrease according to the magnitude relationship.

However, with such a technique, it takes a long time for the actual heating output to reach the heating output required to bring the actual room temperature to the set room temperature, and as a result, the stability of the room temperature is impaired.

The present invention has been made in view of this background, and provides a hot water heating system that can stably perform heating operation so that the temperature in the room where the heating radiator is arranged reaches an appropriate temperature. intended to provide

In order to achieve the above objects, the hot water heating system of the present invention comprises a heat source machine, a heating radiator, and a hot water circulation path for circulating hot water between the heat source machine and the heating radiator, Hot water heated to a target hot water temperature by a heat source device is supplied from the heat source device to the heating radiator through the hot water circulation path, and the hot water radiated by the heating radiator is used as the heating heat radiation. A hot water heating system configured to circulate heat from a vessel to the heat source machine through the hot water circulation path,
A process of estimating a first heat radiation coefficient that defines a relationship between a first temperature difference, which is a temperature difference between an outside air temperature and a room temperature in which the heating radiator is arranged, and an amount of heat radiation from the room to the outside air. A second temperature difference that is a temperature difference between the indoor temperature and the temperature of the hot water in the heating radiator and the amount of hot water radiated by the heating radiator. a heat radiation coefficient estimation processing unit capable of executing processing for estimating a heat radiation coefficient;
a target hot water temperature setting unit capable of variably setting the target hot water temperature;
an estimation command output unit for outputting a command signal for instructing the heat radiation coefficient estimation processing unit to execute the estimation processing of the first heat radiation coefficient and the second heat radiation coefficient to the heat radiation coefficient estimation processing unit according to a predetermined operation; equipped with
When the command signal is input from the estimation command output unit, the heat radiation coefficient estimation processing unit provides a plurality of parameters respectively related to the first heat radiation coefficient and the second heat radiation coefficient, which include the outside air temperature. Detected values or estimated values of the plurality of parameters are acquired, and the detected values or estimated values of the plurality of parameters and a temperature value in the room at the time of execution of the predetermined operation on the estimation command output unit are set in advance. configured to estimate the first heat radiation coefficient and the second heat radiation coefficient using the set room temperature that is the temperature,
After estimating the first heat radiation coefficient and the second heat radiation coefficient by the heat radiation coefficient estimation processing unit, the target hot water temperature setting unit transmits the detected value or estimated value of the outside air temperature to the heat radiation coefficient estimation processing unit. When the command signal changes to a value different from the value at the time of input, after that, each estimated value of the first heat radiation coefficient and the second heat radiation coefficient, the detected value or estimated value of the outside air temperature, and the set room temperature is used to set the target hot water temperature necessary to keep the indoor temperature at the set room temperature (first invention).

In the present invention, the detected value of the parameter such as the outside air temperature means the value of the parameter detected by an appropriate sensor or detector, and the estimated value of the parameter has a certain correlation with the parameter. It means a value estimated based on the correlation from the detected values of one or more other parameters, or a pseudo-estimated value that can be regarded as matching or substantially matching the actual value of the parameter. Target values or command values can also be used as pseudo estimates.

According to the first invention, the first heat radiation coefficient defines the relationship between the first temperature difference, which is the temperature difference between the outside air temperature and the temperature in the room where the heating radiator is arranged, and the amount of heat released from the room to the outside air. and a second heat radiation coefficient that defines the relationship between the second temperature difference, which is the temperature difference between the indoor temperature and the temperature of the hot water in the heating radiator, and the heat radiation amount of the hot water in the heating radiator. and the set room temperature, which is the temperature set in advance as the value of the indoor temperature when a predetermined operation is performed on the estimated command output unit.

After estimating the first heat radiation coefficient and the second heat radiation coefficient, when the detected value or the estimated value of the outside air temperature changes to a value different from the value at the time of inputting the command signal to the heat radiation coefficient estimation processing unit, after that , using the estimated values of the first heat radiation coefficient and the second heat radiation coefficient, the detected or estimated value of the outside air temperature, and the set room temperature to maintain the room temperature at the set room temperature Set the required target hot water temperature.

In this case, by setting the target hot water temperature using the first heat dissipation coefficient and the second heat dissipation coefficient estimated by the heat dissipation coefficient estimation processing unit, the target hot water temperature required to keep the indoor temperature at the set room temperature is It can be appropriately set by reflecting the heat radiation characteristics of a dwelling unit in which a heating system is installed, the heat radiation characteristics of a heating radiator, and the like. For this reason, by controlling the temperature of the hot water supplied from the heat source equipment to the heating radiator so as to achieve the target hot water temperature, the heating radiator can supply just enough heat energy to keep the indoor temperature at the set room temperature. can be stably supplied to

Therefore, according to the first invention, it is possible to stably perform the heating operation so that the temperature in the room in which the heating radiator is arranged reaches an appropriate temperature.

In the first aspect, the plurality of parameters include the outside air temperature, the temperature of hot water supplied from the heat source device to the heating radiator, and the temperature of hot water flowing back from the heating radiator to the heat source device. , and the flow rate of hot water in the hot water circulation path (second invention).

According to this, the first heat radiation coefficient and the second heat radiation coefficient can be appropriately estimated using the plurality of parameters.

In the first or second invention, it is preferable to further include a set room temperature change operation section that variably sets the set room temperature for the radiation coefficient estimation processing section according to a predetermined operation (third invention). .

According to this, it is possible to set a room temperature suitable for the user of the hot water heating system as the set room temperature.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the whole structure of the hot water heating system of embodiment of this invention. 2 is a flowchart showing processing of the control device shown in FIG. 1; FIG. 3 is a flowchart showing the processing of STEP 2 in FIG. 2; FIG. FIG. 3 is a flowchart showing the processing of STEP 5 in FIG. 2; FIG.

One embodiment of the invention is described below with reference to FIGS. Referring to FIG. 1, a hot water heating system 1 of the present embodiment includes a heat source device 2 installed outdoors, a heating radiator 50 installed indoors, and a heat source device 2 and heating radiator 50. and a hot water circulation path 11 for circulating hot water.

The heat source device 2 includes a combustion-type heating device 3 in its housing 2a in this embodiment. The heating device 3 includes a combustion housing 6 in which a burner 4 as a heating unit and a heat exchanger 5 heated by the combustion heat of the burner 4 are housed inside (combustion chamber), and a fuel gas is supplied to the burner 4. A fuel supply passage 7 for supplying fuel and an electric combustion fan 8 for supplying combustion air to the burner 4 are provided.

An exhaust passage 6 a is connected to the combustion housing 6 for leading the combustion exhaust gas generated by the combustion operation of the burner 4 from the inside to the outside of the housing 2 a of the heat source device 2 . The combustion fan 8 is attached to the combustion housing 6 so as to draw combustion air (atmosphere) from the outside of the housing 2a and supply the sucked combustion air to the burner 4 by its rotational operation.

Fuel gas is supplied to the fuel supply path 7 from a pipe of a fuel supply source (not shown). A solenoid valve 7a for opening and closing the fuel supply passage 7 and a fuel control valve 7b for adjusting the amount of fuel gas supplied to the burner 4 are interposed in the fuel supply passage 7 . The fuel regulating valve 7b can be composed of, for example, a proportional valve or an electric flow control valve.

In the heating device 3 configured as described above, the burner 4 is ignited by operating the ignition device (not shown) while operating the combustion fan 8, and by controlling the opening of the electromagnetic valve 7a, and the combustion operation of the burner 4 is started. do. During the combustion operation of the burner 4, the amount of fuel supplied to the burner 4 is adjusted by controlling the fuel control valve 7b, and the heating power of the burner 4 is adjusted accordingly. Further, by closing the solenoid valve 7a, the fuel supply to the burner 4 is cut off and the burner 4 is extinguished.

The heat exchanger 5 is connected to the heating radiator 50 via the hot water circulation path 11 so that the hot water heated by the combustion operation of the burner 4 can circulate between the heat exchanger 5 and the heating radiator 50 . More specifically, the hot water circulation path 11 includes an outward hot water path 11a that supplies hot water from the heat exchanger 5 to the heating radiator 50, and a return hot water path 11b that returns hot water from the heating radiator 50 to the heat exchanger 5. Consists of

The upstream end of the outward hot water passage 11a and the downstream end of the return hot water passage 11b are connected to the outlet and the inlet of the water passage 5a inside the heat exchanger 5, respectively, and the inside of the housing 2a of the heat source device 2 The downstream end of the outward hot water passage 11a and the upstream end of the return hot water passage 11b, which are extended from the heating radiator 50, are connected to the hot water inlet and outlet of the heating radiator 50, respectively. Examples of the heating radiator 40 include a floor heating system, a fan convector, and the like. A thermo valve may be provided on the inlet side or the outlet side of the heating radiator 50 .

A circulation pump 12 is interposed in one of the outward hot water passage 11a and the return hot water passage 11b of the hot water circulation passage 11, for example, the return hot water passage 11b in the housing 2a of the heat source device 2. Circulation of hot water in the hot water circulation path 11 is performed by the operation of 12 .

Various sensors are mounted on the heat source machine 2 . Specifically, the temperature of the hot water supplied from the heat source device 2 to the heating radiator 50 side (hereinafter referred to as the outward hot water temperature) is detected in the outward hot water passage 11a in the housing 2a of the heat source device 2. A forward path temperature sensor 13a is attached to the return path hot water path 11b in the housing 2a of the heat source device 2, and the temperature of the hot water flowing back from the heating radiator 50 to the heat source device 2 (hereinafter referred to as "return hot water temperature"). A return path temperature sensor 13b for detecting is attached.

One of the outward hot water passage 11a and the return hot water passage 11b, for example, the return hot water passage 11b in the housing 2a of the heat source device 2, has a flow rate of hot water circulating in the hot water circulation passage 11 (hereinafter referred to as hot water flow rate). ) is attached. A temperature sensor 15 for detecting the outside air temperature is attached inside the housing 2 a of the heat source device 2 . Note that the temperature sensor 15 may be arranged outside the housing 2a.

A control device 20 having a function of controlling the operation of the heat source device 2 is further mounted inside the housing 2 a of the heat source device 2 . The control device 20 is composed of an electronic circuit unit including, for example, a microcomputer, a memory, an interface circuit, etc., and detects each sensor (including the above sensors 13a, 13b, 14, 15) provided in the heat source machine 2. A signal is input. Further, the control device 20 can communicate with a remote controller 30 for operating the hot water heating system 1 by wire or wirelessly.

The control device 20 has a function of controlling the operation of the heating device 3 and the circulation pump 12 as a function realized by one or both of the implemented hardware configuration and program (software configuration). Function as a heat radiation coefficient estimation processing unit 21 that executes processing for estimating the first heat radiation coefficient R and the second heat radiation coefficient P, and the target temperature of hot water supplied from the heat source device 2 to the heating radiator 50 (outbound hot water temperature) and a function as a target hot water temperature setting unit 22 for setting a target hot water temperature which is a value. The operation control of the heating device 3 (control of the combustion operation of the burner 4) is performed through the operation control of the electromagnetic valve 7a, the fuel control valve 7b, the combustion fan 8, and an ignition device (not shown).

The remote controller 30 is a terminal that can be operated indoors by the user of the hot water heating system 1, and includes a display 31 that displays various information and an operation unit 32. As shown in FIG. In this case, the operation unit 32 includes an operation switch 32a for performing operation start operation or operation stop operation of the hot water heating system 1, and an operation for instructing the control device 20 to execute the processing by the heat radiation coefficient estimation processing unit 21. A plurality of operation switches such as a switch 32b, an operation switch 32c for commanding the control device 20 to increase or decrease the target hot water temperature, and an operation switch 32d for commanding the control device 20 to increase or decrease the set value of the room temperature desired by the user. included. Then, the remote controller 30 outputs a command signal indicating the content of the corresponding command to the control device 20 according to the operation of each of the operation switches 32a to 32d.

Such a remote controller 30 has both a function as an estimation command output section and a function as a set room temperature change operation section in the present invention. In this case, the operation of the operation switch 32b corresponds to a predetermined operation related to the estimation command output section, and the operation of the operation switch 32d corresponds to a predetermined operation related to the set room temperature change operation section.

Each operation switch of the operation unit 32 may have multiple functions. Further, for example, the operation switches 32c and 32d may be composed of common operation switches. Further, the operation unit 32 may be, for example, a touch panel type operation unit. Furthermore, the operation unit 32 may include an audio input unit.

Next, the operation of the hot water heating system 1 of this embodiment will be described. During the first heating operation (or test operation) after installation of the hot water heating system 1, or during the heating operation with a predetermined operation mode set by operating the operation unit 32 of the remote controller 30, the control device 20: While controlling the operation of the heat source equipment 2, the processing of STEPs 1 and 2 in the flowchart of FIG. 2 is executed.

In the operation control of the heat source device 2 in this case, the control device 20 starts the combustion operation of the burner 4 of the heating device 3 while operating the circulation pump 12 at a predetermined rotational speed. Then, the control device 20 sets the target hot water temperature according to the operation of the operation switch 32c of the remote control 30, and the temperature of the hot water detected by the outward temperature sensor 13a matches or substantially matches the set target hot water temperature. , the combustion amount of the burner 4 is controlled. The combustion amount of the burner 4 is controlled through operation control of the fuel control valve 7b and the combustion fan 8. FIG.

While the operation of the heat source device 2 is being controlled in this way, the control device 20 operates the operation switch, which is an execution command operation of the heat radiation coefficient estimation processing unit 21 (hereinafter sometimes referred to as heat radiation coefficient estimation processing). 32b (or voice input corresponding to the operation) is performed by the remote controller 30, and waits while continuing the above-described operation control of the heat source device 2 until the result of this determination becomes affirmative. (Continue the determination process of STEP1).

Here, a user or a contractor (hereinafter referred to as a user or the like) of the hot water heating system 1 can operate the room where the heating radiator 50 is arranged while the heat source device 2 is being operated (heating operation) as described above. The target hot water temperature is adjusted by the operation switch 32c of the remote controller 30 so that the temperature (room temperature) of the hot water is steadily maintained at a temperature that the user can feel as an appropriate temperature. Specifically, when the room temperature is determined to be lower than the proper temperature, the user operates the operation switch 32c to increase the target hot water temperature, and the room temperature is determined to be higher than the proper temperature. Then, the operation switch 32c is operated so as to decrease the target hot water temperature.

Then, when the user or the like determines that the room temperature has steadily reached the appropriate temperature, the user operates the operation switch 32b of the remote controller 30 (or performs voice input corresponding to the operation). As a result, a command signal indicating that the heat dissipation coefficient estimation process should be executed is input from the remote controller 30 to the control device 20, and the result of the determination in STEP1 becomes affirmative.

Note that the remote controller 30 may output notification information (visual or auditory notification information) indicating at what timing the operation switch 32b should be operated. In addition, when the user or the like determines that the room temperature has steadily reached an appropriate temperature, for example, the ambient temperature of the user or the like in the room is measured by an appropriate thermometer, and the temperature matching or substantially matching the measured value is determined. The operation switch 32d may be operated so that the appropriate temperature desired by the user is stored in the controller 20, and then the operation switch 32b may be operated.

When the determination result in STEP1 becomes affirmative, the control device 20 next executes the heat radiation coefficient estimation process (the process of the heat radiation coefficient estimation processing section 21) in STEP2. The heat radiation coefficient estimation process is executed as shown in the flowchart of FIG.

Specifically, in STEP 21, the heat radiation coefficient estimation processing unit 21 of the control device 20 converts the current detected values of the outside air temperature Tg, the forward hot water temperature T1, the homeward hot water temperature T2, and the hot water flow rate M to the above Obtained through temperature sensors 15, 13a, 13b and flow rate sensor 14, respectively. In STEP 21, instead of the detected values of the outside air temperature Tg, the forward hot water temperature T1, the return hot water temperature T2, and the hot water flow rate M, values estimated from the detected values of other parameters related to each are obtained. may

Further, in STEP 21, the radiation coefficient estimation processing unit 21 reads the set room temperature Ts from a memory (not shown). The set room temperature Ts is a temperature value stored in advance in the memory of the control device 20 as an appropriate room temperature for the user. However, the set room temperature Ts is changed from the default value to a desired temperature (eg, 22° C., 24° C., 18° C., etc.) within a predetermined range by the user or the like operating the operation switch 32d of the remote control 30. is also possible. The operation switch 32d for changing the set room temperature Ts may be configured by, for example, a DIP switch or the like attached to the control device 20 instead of the remote control 30. FIG.

Next, in STEP22, the radiation coefficient estimation processing unit 21 calculates the heating output Q1 from the detection values of the outward hot water temperature T1, the homeward hot water temperature T2, and the hot water flow rate M acquired in STEP21. The heating output Q1 corresponds to the amount of heat (thermal energy) supplied from the heat source device 2 to the heating radiator 50 via hot water per unit time. It is calculated by the formula (1).

Q1 [W] = ((T1 [°C] - T2 [°C]) x M [liter/min] x 60) ÷ 0.86 … (1)

Note that 0.86 on the right side of equation (1) is a constant for converting the unit of the heating output Q1 from [kcal/h] to [W].

Supplementally, in the operation control of the heating device 3, when the target heat quantity of the burner 4 is successively set and the combustion quantity (the amount of heat generated per unit time) of the burner 4 is controlled so as to achieve this target heat quantity, for example Alternatively, the target heat quantity may be regarded as an estimated value of the calorific value of the burner 4, and the heat quantity obtained by multiplying the target heat quantity by the set value of the heat transfer efficiency from the burner 4 to the hot water may be calculated as the heating output Q1. In this case, the heating output Q1 can be calculated without requiring the values of T1, T2 and M.

Next, in STEP 23, the radiation coefficient estimation processing unit 21 estimates the first radiation coefficient R from the value of the heating output Q1 obtained in STEP 22 and the detected value of the outside air temperature Tg and the value of the set room temperature Ts obtained in STEP 21. Calculate the value.

The first heat radiation coefficient R is the first temperature difference, which is the temperature difference between the room temperature and the outside air temperature in a steady state in which the room temperature (room temperature) in which the heating radiator 50 is arranged is kept substantially constant, and the A proportionality factor (a proportionality factor when the amount of heat dissipation is considered to be approximately proportional to the first temperature difference) that approximately defines the relationship between the amount of heat dissipation from the room to the outside air (the amount of heat dissipation per unit time) . This first radiation coefficient R depends on the structure of the dwelling unit in which the hot water heating system 1 is installed, and can be regarded as a parameter unique to the dwelling unit.

Here, in a steady state in which the temperature (room temperature) of the room in which the heating radiator 50 is arranged is kept substantially constant, the amount of heat radiation from the room to the outside air can be considered to match or substantially match the heating output Q1. . Therefore, in STEP 23, the heat radiation coefficient estimation processing unit 21 calculates an estimated value of the first heat radiation coefficient R from the values of Q1, Tg, and Ts, for example, using the following equation (2).

R [W/°C] = Q1 [W] ÷ (Ts [°C] - Tg [°C]) ……(2)

Note that, for example, the reciprocal value (=1/R) of the value obtained by the calculation of the right side of Equation (2) may be calculated as the first heat radiation coefficient. Alternatively, the first heat radiation coefficient R may be calculated by an arithmetic expression combining the expressions (1) and (2).

Furthermore, in STEP 24, the heat radiation coefficient estimation processing unit 21 determines the value of the heating output Q1 obtained in STEP 22, the detection values of the outward hot water temperature T1 and the homeward hot water temperature T2 obtained in STEP 21, and the set room temperature Ts. , the second heat radiation coefficient P is calculated (estimated).

The second heat radiation coefficient P is the temperature (room temperature) in the room where the heating radiator 50 is arranged and the heating A second temperature difference, which is a temperature difference from the temperature of hot water flowing through the radiator 50 (average temperature of the hot water), and the heat radiation amount of the hot water in the heating radiator 50 (from the heating radiator 50 to the room per unit time is a proportional coefficient (proportional coefficient when it is assumed that the heat release amount is approximately proportional to the second temperature difference) that approximately defines the relationship between the heat release amount and the second temperature difference. The second heat radiation coefficient P depends on the heat radiation characteristics of the heating radiator 50 and can be regarded as a parameter unique to the heating radiator 50 .

Here, in a steady state in which the temperature (room temperature) in the room in which the heating radiator 50 is arranged is kept substantially constant, the average temperature THave of the hot water flowing through the heating radiator 50 is the forward side hot water temperature T1 and the return side It can be regarded as matching or substantially matching the average value with the hot water temperature T2. In addition, it can be considered that the amount of heat radiation from the heating radiator 50 to the room (the amount of heat radiation per unit time) matches or substantially matches the heating output Q1.

Therefore, in STEP 24, the heat radiation coefficient estimation processing unit 21 calculates an estimated value of the second heat radiation coefficient P from the values of Q1, T1, T2, and Ts, for example, using the following equation (3).

P [W/°C] = Q1 [W] ÷ (THave [°C] - Ts [°C])
= Q1[W]÷(((T1[°C]+T2[°C])/2)-Ts[°C]) ……(3)

Note that, for example, the reciprocal value (=1/P) of the value obtained by the calculation of the right side of Equation (3) may be calculated as the second heat radiation coefficient. Alternatively, the estimated value of the second heat radiation coefficient P may be calculated by an arithmetic expression combining the expressions (1) and (3). Moreover, STEP24 may be executed before STEP23.

Next, in STEP 25, the radiation coefficient estimation processing section 21 calculates the detected value of the outside air temperature Tg acquired in STEP 21 and the estimated values of the first radiation coefficient R and the second radiation coefficient P obtained in STEPs 23 and 24, respectively. It is stored and held in a memory (not shown). The heat radiation coefficient estimation process in STEP2 of FIG. 2 is executed as described above.

Next, during the heating operation of the hot water heating system 1 after the heat radiation coefficient estimation processing has been executed as described above, the control device 20 executes the processing from STEP3. Note that the heating operation in this case may be either the heating operation that continues after the heat radiation coefficient estimation process is executed, or the heating operation that has been temporarily stopped.

In STEP 3, the control device 20 changes the current outside air temperature Tg detected via the temperature sensor 15 from the outside air temperature Tg stored in the above STEP 25 (the detected value obtained when the heat radiation coefficient estimation process is executed. It is determined whether the temperature has changed to a temperature different from the temperature Tg0). In this case, in the present embodiment, the control device 20, for example, when the detected value of the outside air temperature Tg changes to a temperature different from the reference outside air temperature Tg0 by a predetermined value or more (for example, 1° C. or more), or when the outside air temperature Tg If the detected value differs from the reference outside air temperature Tg0 by a predetermined value or more for a predetermined time or longer, it is determined that the determination result in STEP3 is affirmative.

Then, if the determination result in STEP 3 is negative, the control device 20 performs temperature regulation control of the hot water in STEP 4 while maintaining the target hot water temperature at the target hot water temperature during execution of the heat radiation coefficient estimation process. . That is, the control device 20 controls the operation of the heating device 3 so that the detection value of the outward side hot water temperature T1 detected by the temperature sensor 13a matches or substantially matches the target hot water temperature when the heat radiation coefficient estimation process is executed. conduct. Then, the control device 20 continues the processing from STEP3.

In this case, since the outside air temperature Tg matches or substantially matches the reference outside air temperature Tg0, the temperature in the room in which the heating radiator 50 is arranged is approximately the appropriate temperature (≈set room temperature Ts) at the time of execution of the heat radiation coefficient estimation process. kept the same.

On the other hand, if the determination result in STEP3 is affirmative, the detected value of the outside air temperature Tg is higher than or lower than the reference outside temperature Tg0 by a predetermined value or more, so the target hot water temperature is set to the current temperature. If the temperature is maintained at (the temperature at which the heat dissipation coefficient estimation process is executed), the room temperature will drop below the proper temperature (≈set room temperature Ts) or rise above it.

Therefore, in this case, in STEP5, the control device 20 calculates the target hot water temperature T1cmd by the target hot water temperature setting unit 22 using the first heat radiation coefficient R and the second heat radiation coefficient P stored in the above STEP25. do. The process of STEP5 is performed as shown in the flow chart of FIG.

Specifically, in STEP 51, the target hot water temperature setting unit 22 of the control device 20 detects the current outside air temperature Tg and the hot water flow rate M via the temperature sensor 15 and the flow rate sensor 14, respectively. get. Also, the target hot water temperature setting unit 22 reads the set room temperature Ts, the first heat radiation coefficient R, and the second heat radiation coefficient P from a memory (not shown).

Next, in STEP 52, the target hot water temperature setting unit 22 sets the room temperature to the set room temperature Ts (appropriate temperature) from the detected value of the outside air temperature Tg, the value of the set room temperature Ts, and the value of the first heat radiation coefficient R obtained in STEP 51. Calculate the necessary heating output Q1dmd, which is the heating output for maintaining.

In this case, the target hot water temperature setting unit 22 calculates the required heating output Q1dmd from the values of R, Ts, and Tg obtained in STEP 51, using the following formula (4) obtained by modifying the formula (2). do.

Q1dmd[W]=R×(Ts[°C]-Tg[°C]) ……(4)

Next, in STEP53, the target hot water temperature setting unit 22 calculates the target hot water temperature T1cmd from the value of Q1dmd obtained in STEP52 and the values of the second heat radiation coefficient P, the set room temperature Ts, and the hot water flow rate M obtained in STEP51. Calculate

In this case, the target hot water temperature setting unit 22 first calculates the hot water in the heating radiator 50 from the respective values of Q1dmd, Ts, and P according to the following formula (5) obtained by modifying the above formula (3), for example. The average temperature THave of is calculated.

THave[°C]=(Q1dmd[W]÷P{W/°C})+Ts[°C] ……（5）

Furthermore, the target hot water temperature setting unit 22 uses the value of THave calculated as described above, the value of Q1dmd calculated in STEP 52, and the value of M obtained in STEP 51 to obtain the above formula (1) and THave=( The target hot water temperature T1cmd is calculated by the following equation (6) obtained from the relational expression T1+T2)/2.

Ｔ1cmd[℃]＝THave[℃]＋(Q1dmd[W]÷M[liters/min]÷60÷2×0.86)
……(6)

The process of calculating the target hot water temperature T1cmd in STEP5 of FIG. 2 is executed as described above. Note that the target hot water temperature T1cmd may be calculated by an arithmetic expression integrating the above expressions (4) to (6).

Returning to FIG. 2, after calculating the target hot water temperature T1cmd in STEP5 as described above, the controller 20 next performs temperature control of hot water in accordance with the target hot water temperature T1cmd in STEP6. That is, the control device 20 controls the operation of the heating device 3 so that the detection value of the forward hot water temperature T1 detected by the temperature sensor 13a matches or substantially matches the target hot water temperature T1cmd. Then, the control device 20 continues the processing from STEP3.

In this case, when the outside air temperature Tg changes from the reference outside air temperature Tg0, the target hot water temperature T1cmd is calculated using the values of the first heat radiation coefficient R and the second heat radiation coefficient P as described above. The temperature of the hot water supplied from the heat source device 2 to the heating radiator 50 (outbound side hot water temperature T1) is adjusted so that (≈set room temperature Ts) is maintained. After the determination result in STEP3 becomes affirmative, the target hot water temperature T1cmd is calculated immediately after the determination result in STEP3 becomes affirmative in a state where the detected value of the outside air temperature Tg is maintained substantially constant. It may be maintained at the same value as the target hot water temperature T1cmd.

Further, when the operation switch 32c of the remote controller 30 is operated to increase or decrease the target hot water temperature during the heating operation, the control device 20 executes the processing from STEP1 again.

In this embodiment, as described above, hot water temperature control is performed during the heating operation of the hot water heating system 1. In this case, during the actual operation of the hot water heating system 1, required parameters (T1, T2, M etc.), the first heat radiation coefficient R and the second heat radiation coefficient P are identified (estimated). For this reason, the first heat radiation coefficient R and the second heat radiation coefficient P are made to reflect the actual heat radiation characteristics to the outside air of the dwelling unit in which the hot water heating system 1 is installed and the actual heat radiation characteristics from the heating radiator 50 to the room. can be properly estimated in the form of

After execution of the heat radiation coefficient estimation process, if the outside air temperature Tg changes to a temperature different from the temperature (reference outside temperature Tg0) at the time of execution of the heat radiation coefficient estimation process, the estimated first heat radiation coefficient R and the second heat radiation A target hot water temperature T1cmd is calculated using the coefficient P, and temperature control of hot water is performed according to the target hot water temperature T1cmd. For this reason, in order to keep the temperature in the room where the heating radiator 50 is arranged at the set room temperature Ts that the user recognized as an appropriate temperature when executing the heat radiation coefficient estimation process, the heat source device 2 supplies just enough heat energy. It can be supplied via hot water from the heating radiator 50 . As a result, the temperature in the room in which the heating radiator 50 is arranged can be stably maintained at a temperature in the vicinity of the set room temperature Ts, which is an appropriate temperature for the user.

Supplementally, in this embodiment, when the room temperature recognized as appropriate by the user is different from the preset room temperature Ts when the heat radiation coefficient estimation process is executed, the detected value of the outside air temperature Tg is set to the reference outside air temperature Tg0. There may be a discrepancy between the actual room temperature and the proper temperature, which is realized when the temperature changes to a different temperature. However, according to the study of the inventor of the present application, for example, in a state where the set room temperature Ts is set to 20° C., the actual room temperature (appropriate temperature) at the time of execution of the heat radiation coefficient estimation process is the set room temperature Ts (20° C.) Even if the outside air temperature Tg differs within the range of ±4°C, it is realized when the outside temperature Tg changes to a different temperature within the range of ±10°C from the temperature (reference outside temperature Tg0) at the time of execution of the heat radiation coefficient estimation process It was confirmed that the difference between the room temperature and the appropriate temperature remained within the range of about ±2°C.

It should be noted that the present invention is not limited to the embodiments described above, and other embodiments can be employed. In the above-described embodiment, the case where only one heating radiator 50 is connected to the hot water circulation path 11 was illustrated, but a plurality of heating radiators 50 are connected between the outward hot water path 11a and the homeward hot water path 11b of the hot water circulation path 11. A heating radiator may be connected. In this case, the set room temperature Ts is set as a common temperature for all the rooms in which the heating radiators are arranged. Also, the first heat radiation coefficient R and the second heat radiation coefficient P calculated by the heat radiation coefficient estimation process have meaning as heat radiation coefficients related to the entire heating radiator.

In the above-described embodiment, the heat source device 2 has the combustion-type heating device 3, but the heat source device 2 has, for example, a heat pump device as a heating device, or a combustion-type heating device and a heat pump device. and both as heating devices. Further, the fuel for the combustion-type heating device is not limited to fuel gas, and may be liquid fuel.

1 Hot water heating system 2 Heat source device 11 Hot water circulation path 50 Heating radiator 21 Radiation coefficient estimation processing unit 22 Target hot water temperature setting unit 30 Remote control (estimation command output unit, set room temperature change operation part).

Claims (3)

A heat source device, a heating radiator, and a hot water circulation path for circulating hot water between the heat source device and the heating radiator, wherein hot water heated by the heat source device to a target hot water temperature is The hot water is supplied from the heat source machine to the heating radiator through the hot water circulation path, and the hot water radiated by the heating radiator is returned from the heating radiator to the heat source machine through the hot water circulation path. A hot water heating system comprising:
A process of estimating a first heat radiation coefficient that defines a relationship between a first temperature difference, which is a temperature difference between an outside air temperature and a room temperature in which the heating radiator is arranged, and an amount of heat radiation from the room to the outside air. A second temperature difference that is a temperature difference between the indoor temperature and the temperature of the hot water in the heating radiator and the amount of hot water radiated by the heating radiator. a heat radiation coefficient estimation processing unit capable of executing processing for estimating a heat radiation coefficient;
a target hot water temperature setting unit capable of variably setting the target hot water temperature;
an estimation command output unit for outputting a command signal for instructing the heat radiation coefficient estimation processing unit to execute the estimation processing of the first heat radiation coefficient and the second heat radiation coefficient to the heat radiation coefficient estimation processing unit according to a predetermined operation; equipped with
When the command signal is input from the estimation command output unit, the heat radiation coefficient estimation processing unit provides a plurality of parameters respectively related to the first heat radiation coefficient and the second heat radiation coefficient, which include the outside air temperature. Detected values or estimated values of the plurality of parameters are acquired, and the detected values or estimated values of the plurality of parameters and a temperature value in the room at the time of execution of the predetermined operation on the estimation command output unit are set in advance. configured to estimate the first heat radiation coefficient and the second heat radiation coefficient using the set room temperature that is the temperature,
After estimating the first heat radiation coefficient and the second heat radiation coefficient by the heat radiation coefficient estimation processing unit, the target hot water temperature setting unit transmits the detected value or estimated value of the outside air temperature to the heat radiation coefficient estimation processing unit. When the command signal changes to a value different from the value at the time of input, after that, each estimated value of the first heat radiation coefficient and the second heat radiation coefficient, the detected value or estimated value of the outside air temperature, and the set room temperature is used to set the target hot water temperature necessary to keep the indoor temperature at the set room temperature. The hot water heating system according to claim 1,
In addition to the outside air temperature, the plurality of parameters include the temperature of hot water supplied from the heat source device to the heating radiator, the temperature of hot water flowing back from the heating radiator to the heat source device, and the hot water circulation path. and a hot water flow rate of . The hot water heating system according to claim 1 or 2,
A hot water heating system, further comprising a set room temperature change operation section that variably sets the set room temperature for the radiation coefficient estimation processing section according to a predetermined operation.

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