JP2000205583A - Heat source facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the mixture temperature of fluid to be heated flowing from the return path section of a circulation channel to a fluid heater while reducing cost. SOLUTION: A plurality of fluid heaters 2 are coupled in parallel with a circulation channel 3, a supplement means 9 supplements fluid to be heated consumed by a terminal load M and the heating section of a fluid heater 2 is regulated to heat the fluid to be heated up to a set target temperature based on detection information from a flow detecting means and a temperature detecting means. An operation control means 5 executes heating operation for increasing the number of a plurality of fluid heaters 2 being operated as the thermal load increases while altering the number of the fluid heaters 2 for conducting the fluid to be heated through control of an intermittent means. Based on detection information from the temperature detecting means at the fluid heater 2 conducting the fluid to be heated, mixture temperature the fluid to be heated flowing from the return path section of the circulation channel 3 to the fluid heater is determined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating system in which a plurality of fluid heaters for heating a fluid to be heated flowing through a heating channel circulates and flows the fluid to be heated to a terminal load by a feed action of a forced circulation means. Connect the inlet side of the heating flow path to the return path part of the flow path, and connect the outlet side of the heating flow path to the outward path part of the circulation flow path, and parallel to the circulation flow path. Connected, pressurized supply of the fluid to be heated to a portion of the return path of the circulation flow path that is on the upstream side of the connection point of the fluid heater in order to replenish the consumption of the fluid to be heated at the terminal load. Replenishing means for interrupting the flow of the fluid to be heated from the circulation flow path is provided for each of the plurality of fluid heaters; Change the number of fluid heaters Relates to the heat source equipment operation control means for performing a heating operation to increase the number of heating operation among the plurality of fluid heater as the heat load is large is provided.

[0002]

2. Description of the Related Art In the above-mentioned heat source equipment, conventionally,
Mixing temperature detecting means for detecting the mixing temperature of the fluid to be heated flowing from the return path portion of the circulation flow path to the fluid heater is provided,
From the mixing temperature detected by the mixing temperature detecting means, the amount of heat per unit to be heated is determined, and based on the amount of heat per unit to be heated and the flow rate of the fluid to be heated per unit through which the fluid to be heated flows. It is known that the number of operating units including a plurality of fluid heaters is increased or decreased to maintain the temperature of the fluid to be heated in a forward path portion of a circulation flow channel at a set target supply temperature (for example, Japanese Patent Application Laid-Open No. 3-195589). Gazette). Also, when the operation of the fluid heater is controlled so as to maintain the temperature of the fluid to be heated in the outward path portion of the circulation flow channel at the set target supply temperature, or when the need to prevent freezing of the fluid to be heated in the circulation flow channel is determined. To this end, the mixing temperature of the fluid to be heated flowing from the return path portion of the circulation flow path to the fluid heater is detected by the mixing temperature detecting means.

[0003]

However, the conventional heat source equipment is provided with dedicated mixing temperature detecting means for detecting the mixing temperature of the fluid to be heated flowing from the return path of the circulation flow path to the fluid heater. For this reason, the mixing temperature detecting means cannot be used for other purposes, and the cost is rather increased.

The present invention has been made in view of this point, and an object thereof is to reduce the mixing temperature of the fluid to be heated flowing from the return path of the circulation flow path to the fluid heater while reducing the cost. It is to provide a heat source equipment that can be detected.

[0005]

According to the first aspect of the present invention, there is provided a fluid heating device comprising: a heating section for heating a fluid to be heated; Flow rate detecting means for detecting the flow rate of the fluid to be heated flowing through the flow path, and temperature detecting means for detecting the temperature of the fluid to be heated before being heated by the heating unit, the flow rate detecting means and the temperature detecting means The heating unit is configured to be adjusted to heat the fluid to be heated to the set target temperature based on the detection information of
The operation control means is configured to obtain a mixing temperature of the fluid to be heated flowing from the return path portion of the circulation flow path to the fluid heater based on the detection information of the temperature detection means in the fluid heater through which the fluid to be heated flows. Have been. That is, the detection information of the temperature detecting means used as information when heating the heated fluid to the set target temperature is used when detecting the mixed temperature of the heated fluid flowing from the return path portion of the circulation flow path to the fluid heater. It can also be used as information, without newly providing a dedicated mixing temperature detecting means for detecting the mixing temperature,
For example, one of the detected temperatures can be determined as the mixed temperature based on the detection information of the temperature detecting means in the fluid heater through which the fluid to be heated flows.

According to the second aspect of the present invention, the operation control means is configured to determine, as the mixing temperature, an average temperature detected by the temperature detecting means in the fluid heater through which the fluid to be heated flows. I have. That is, based on the detection information of the temperature detecting means in all of the fluid heaters through which the fluid to be heated flows, the average temperature of the detected temperatures is obtained as the mixed temperature. The mixing temperature of the heated fluid to be heated can be accurately detected.

According to the third aspect of the present invention, the total flow rate detecting means for detecting the total flow rate of the fluid to be heated flowing from the return path portion of the circulation flow path to the fluid heater is provided. Based on the detection information of the flow rate detection means, as the number of fluid heaters through which the fluid to be heated flows, determine the number of flow paths for branching and flowing the fluid to be heated by a set appropriate amount, and Based on the detection information and the mixing temperature, as the number of fluid heaters to be heated, the number of heating operations that can be heated to the set target temperature with a capacity equal to or less than the flow number and within the heating capacity was determined. It is configured to execute the heating operation based on the number of flowing currents and the number of heating operations. Therefore, for the number of flowing
Based on the detection information of the total flow rate detecting means, the number of flowing fluids for branching and flowing the fluid to be heated by a set appropriate amount is set, and the number of heating operations is determined by the total flow rate of the fluid to be heated and the obtained mixing temperature. On the basis of this, it is possible to make the number of heating operations that can be heated to the set target temperature with the capacity equal to or less than the number of flowing currents and within the heating capacity. Can be performed.

According to the fourth aspect of the present invention, in the heating operation, the operation control means detects the mixing temperature, the set target supply temperature of the fluid to be heated in the outward portion of the circulation flow path, and the detection of the total flow rate detection means. The set target temperature of the fluid heater to be heated is determined based on the information and the detection information of the heating flow rate detecting means for detecting the flow rate of the fluid to be heated flowing through the fluid heater to be heated. The fluid heating device is configured to heat the fluid to be heated to the set target temperature obtained. In other words, using the obtained mixing temperature, a set target temperature for setting the temperature of the fluid to be heated in the forward path portion of the circulation flow path to the set target supply temperature is obtained, and the heating operation is performed at the set target temperature. The temperature of the fluid to be heated in the forward part of the road can be maintained at the set target supply temperature. Therefore, claim 2
Using the obtained mixing temperature, the fluid to be heated is set to the set target temperature by the fluid heater that performs the heating while using the determined mixing temperature to set the appropriate number of flow and the number of the heating operation, and the outward flow of the circulation flow path is performed. The temperature of the fluid to be heated in the section can be maintained at the set target supply temperature.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat source equipment according to the present invention will be described with reference to the drawings. This heat source equipment is installed on the roof of an apartment or the like, and circulates and flows hot and cold water as a fluid to be heated at a system set temperature as a set target supply temperature,
A heating system capable of supplying hot water to each dwelling unit in an apartment, as shown in FIG. 1, a plurality of hot water heaters 2 as fluid heaters for heating hot water flowing through a heating flow path 1
And the hot and cold water heated by the plurality of water heaters 2
A circulation flow path 3 for circulating and flowing the fuel gas, a gas supply path 4 for supplying a fuel gas to the plurality of water heaters 2, and a control device 5 as operation control means for managing the operation. In this embodiment, the fluid to be heated is hot water. However, the fluid to be heated is not limited to this, and another heat medium may be used. Further, the system set temperature may be a preset temperature or a temperature set by a manual operation.

The circulation flow path 3 includes a return path 3a for supplying hot water from the terminal load M to the plurality of water heaters 2 and an outward path for supplying hot water heated by the plurality of water heaters 2 to the terminal load M. 3b. Then, the inlet side 1a of each heating channel 1 of the plurality of water heaters 2 is connected to the circulation channel 3
The plurality of water heaters 2 circulate while the outlet side 1b of each heating channel 1 of the plurality of water heaters 2 is connected to the outward path portion 3b of the circulation channel 3. It is connected to the flow path 3 in parallel. In the return path portion 3a of the circulation flow path 3, one pump unit 8 as a forced circulation means including a circulation pump 6 for circulating hot water and a check valve 7 is provided. The hot water is supplied by a plurality of water heaters 2 by the feeding action, the forward path portion 3b of the circulation flow path 3, the terminal load M, and the return path part 3a of the circulation flow path 3 in the order of:
Hot water is circulated through the circulation channel 3.

On the upstream side of the connection point of the water heater 2 in the return path portion 3a of the circulation flow path 3, water is supplied to the plurality of water heaters 2 so as to replenish the consumption of the water at the terminal load M. A water supply passage 9 is connected as a replenishing means for supplying water supplied by tap water through a check valve 10, an expansion tank 11, a manual valve 12, and a pressure switch 13 provided in the water supply passage 9. After the circulating hot water is mixed, the mixed hot water is supplied to the plurality of water heaters 2. A plurality of hot water taps 1 are used as the terminal load M.
A constant flow valve 15 for circulating hot water at a predetermined bypass flow rate even when there is no load in order to equalize the amount of hot water in each hot water tap 14 is provided for all of the hot water taps 14. Is provided.

The plurality of water heaters 2 will be described.
In this heats system, a parent unit 16 having three water heaters 2 and a child unit 17 having four water heaters 2
And a maximum of four child units 17 can be connected. That is, this heats system is configured so that the units 16 and 17 can be connected to each other so that the gas supply path 4 of each unit 16 and 17, the return path 3 a of the circulation flow path 3, and the return path of the circulation flow path 3. 3b are configured to be connectable. Although not shown, the gas supply path 4, the return path portion 3a of the circulation flow path 3 and the return path 3b of the circulation flow path 3 of the child unit 17 to be connected last have a cut-off end. A tap is provided. The parent unit 16 includes a system controller 18 that controls the operation of the plurality of water heaters 2 and the pump unit 8, and an outgoing thermistor 19 that detects the temperature of the hot water heated by the plurality of water heaters 2. Provided.

All of the plurality of water heaters 2 have the same configuration. The configuration will be described. As shown in FIG.
Is provided with a water heater controller 37 for controlling the operation of the water heater. The heat exchanger 21 for water heating provided in the combustion chamber 20, a burner 22 as a gas combustion type heating unit having an adjustable heating amount for heating the heat exchanger 21, and the like. A fan 23 is provided that allows the combustion air to flow from the upstream side of the burner 22 and that allows the ventilation amount to be changed and adjusted.

The heating flow path 1 having its inlet side connected to the return path portion 3a of the circulation flow path 3 and its outlet side connected to the outward path part 3b of the circulation flow path 3, heats hot and cold water with a burner 22. And a bypass passage 24 through which the hot and cold water flows without being heated. A bypass valve 25 for opening and closing the bypass passage 24 is provided. When the bypass valve 25 is open, the hot water from the heat exchanger 21 and the hot water from the bypass passage 24 are mixed, and the outlet 1b of the heating flow path 1 is mixed. To the circulation channel 3.

In the heating flow path 1, an inlet thermistor 26 as a temperature detecting means for detecting the temperature of hot water supplied from the inlet side 1a of the heating flow path 1 in order from the upstream side, and detects the flow rate of hot water. Flow rate sensor 27 as a flow rate detecting means, heat exchanger 21, heat exchange thermistor 28 for detecting the temperature of hot and cold water in heat exchanger 21, and interrupting the hot and cold flow of hot and cold water from circulation flow path 3. A water proportional valve 29 as an intermittent means for adjusting the flow rate, and an outlet thermistor 30 for detecting the temperature of hot water supplied to the outlet side of the heating channel
Is provided. The bypass passage 24 is connected to the heating flow path 1 between the flow rate sensor 27 and the heat exchanger 21 and the heating flow path 1 between the heat exchange thermistor 28 and the water proportional valve 29.
Are provided so as to be connected to each other.

The fuel supply passage 31 for the burner 22 includes:
In order from the upstream side, an electromagnetically operated safety valve 32 for interrupting the fuel supply, an electromagnetically operated gas proportional valve 33 capable of changing and adjusting the fuel supply amount (burning amount of the burner 22), and the number of burners 22 to be burned are switched. Solenoid operated switching solenoid valve 3
4, an igniter 35 for performing an ignition operation on the burner 22 and a frame rod for detecting whether or not the burner 22 is ignited, near the burner 22. 36 are provided respectively.

As shown in FIG. 3, the system controller 18 changes the number of water heaters 2 through which the hot water flows so that the hot water temperature detected by the outgoing thermistor 19 becomes the system set temperature. The heating operation is performed so that the number of heating operations among the plurality of water heaters 2 increases as the heat load increases, and a control command is transmitted to the water heater controller 37 of each water heater 2. The water heater controller 37 of each water heater 2 adjusts the open / close state of the water proportional valve 28, the combustion amount of the burner 22, and the open / close state of the bypass valve 25 based on a control command from the system controller 18. It is configured as follows. Therefore, the control device 5
It comprises a system controller 18 and a water heater controller 37 of each water heater 2.

That is, the control device 5 is provided with a water heater 2 for flowing hot and cold water for branching and flowing the hot and cold water by a set appropriate amount.
The number-of-flows calculation process for calculating the number of flow-throughs, the number-of-combustion-numbers calculation for calculating the number of heating operations that can be heated to the set temperature for hot water supply as a set target temperature with a capability equal to or less than the number of flowes and within the heating capacity, Hot water supply set temperature calculation processing for calculating a hot water supply set temperature to supply the hot water to the circulation flow path 3 from the water heater 2 which is heating and operating so that the temperature of the hot water in the outward path portion 3b of the circulation flow path 3 becomes the system set temperature. Based on the calculated number of flowing water, the number of combustion, and the set hot water supply temperature, each process of the water heater operation control process for controlling the operation state of the plurality of water heaters 2 is executed to execute the circulation flow. The temperature of the hot and cold water circulating in the passage 3 is maintained at the system set temperature.

The system controller 18 performs the above-mentioned flow number calculation processing by the water heater controller 37 of each water heater 2.
With the communication with the water heater 2, the flow rates detected by the flow rate sensors 27 of the respective water heaters 2 are summed and the water heater 2
The total flow rate Q, which is the total flow rate of hot and cold water flowing, is calculated, and based on the obtained total flow rate Q, the number of water heaters 2 flowing through the hot water is calculated by the following [Equation 1]. The number of passing vehicles QK is calculated. That is, the total flow rate detecting means includes the system controller 18, the water heater controller 37, and the flow rate sensor 27.

The open / close state of the bypass valve 25 of the water heater 2 through which the hot water flows is either open or closed, and the bypass valves 25 of all the hot water heaters 2 through which the hot water flows.
Are controlled to the same state. When the bypass valve 25 is closed, the small flow rate mode is selected, and when the bypass valve 25 is open, the large flow rate mode is selected.

The switching of the open / close state of the bypass valve 25 is based on the temperature of the hot water after the water from the water supply passage 9 and the hot water circulating through the circulation flow path 3 are mixed from the system set temperature Ts. The switching is performed based on the switching temperature (system setting temperature Ts-system mixing temperature Tk) obtained by subtracting the mixing temperature Tk. For example, when the switching temperature becomes 55 ° C. or higher, the bypass valve 25 is changed from the open state to the closed state to change the flow rate. When the small mode is selected and the switching temperature becomes 45 ° C. or lower, the bypass valve 25 is changed from the closed state to the open state, and the large flow rate mode is selected. That is, the bypass valve 25 is closed when the system mixing temperature Tk is lower than or equal to the set value, and the bypass valve 25 is opened when the system mixing temperature Tk is higher than the set value.

Then, with respect to the system set temperature Ts,
In the following [Equation 1], when the bypass valve 25 is in the open state, the flow rate is set to be large when the system mixing temperature Tk is lower than or equal to the set value. The number QK of flow is calculated, and when the bypass valve 25 is closed, the number QK of flow is calculated in the small flow rate mode.

[0023]

(Equation 1)

The INT is a value obtained by converting the numerical value to an integer closer to 0 than the calculated numerical value. Also,
Numerical values such as 5 (liter / min) and 10 (liter / min) in [Equation 1] are changed depending on the water heater 2 to be used and are not limited to these numerical values. However, when the number of flowing currents QK <3, the number of flowing currents QK = 3, and the water heater 2 connected to the circulation flow path 3
If the number of flowing water QK> the number of connected SD-the number of failed KD, the number of flowing QQ = the number of connected SD-the number of failed KD, based on the number SD of the number of failed water heaters KD. .

The system controller 18 performs the above-described combustion number calculation processing by the water heater controller 37 of each water heater 2.
Communication with the system, the system set temperature Ts, the total flow rate Q,
Further, based on the system mixing temperature Tk which is the temperature of the hot water after the water from the water supply passage 9 and the hot water circulating in the circulation flow path 3 are mixed, the hot water flows according to the following [Equation 2]. The number of combustions NK, which is the number of heating operations of the plurality of water heaters 2 that perform heating, is calculated. That is, the system controller 18 determines the average temperature of the detected temperatures of all the inlet-side thermistors 26 of the water heater 2 through which the hot water flows through the communication with the water heater controller 37 as the system mixed temperature Tk.

[0026]

(Equation 2)

Note that 160 (kcal) in [Equation 2]
/ Min) and 200 (kcal / min) are changed depending on the water heater 2 to be used and are not limited to these values. However, (system set temperature Ts
-System mixing temperature Tk) x total flow rate Q ≤ 20 (kca
1 / min) or the detection temperature Ti of the outgoing thermistor 19
If the system set temperature Ts + 5 ° C., the number of combustion units N
Let K = 0.

In the above hot water supply set temperature calculation processing, the system controller 18 communicates with the water heater controller 37 of each water heater 2 by operating the system set temperature Ts, the total flow rate Q, the system mixing temperature Tk, and the heating operation. Hot water heater 2
Based on the combustion flow rate Qn, which is the sum of the flow rate sensors 27 of FIG.
Then, the hot water supply set temperature Th is calculated so as to supply the hot water to the circulation channel 3. The heating flow rate detection means is constituted by the system controller 18, the water heater controller 37, and the flow rate sensor 27 of the water heater 2 that is heating.

[0029]

(Equation 3)

However, it is assumed that the system set temperature Ts ≦ the hot water supply set temperature Th ≦ 80 ° C.

The above [Equation 3] is the following [Equation 4] for calculating the system set temperature Ts based on the hot water supply set temperature Th, the total flow rate Q, the system mixing temperature Tk, and the combustion flow rate Qn. It is required to be transformed.

[0032]

(Equation 4)

The water heater operation control process is performed by the system controller 18 based on the number of flowing air QK, the number of combustion NK, and the hot water supply set temperature Th obtained by calculation.
A control command is transmitted to each water heater controller 37 in order to control the operating state of each water heater 2 so that the temperature of the hot water in the outward path portion 3b becomes the system set temperature Ts. Then, each water heater controller 37 adjusts the open / closed state of the water proportional valve 28, the combustion amount of the burner 22, and the open / closed state of the bypass valve 25 based on a control command from the system controller 18.

More specifically, priorities are set for a plurality of water heaters 2, and the water heaters 2 for flowing hot and cold water so that the number of flowing waters QK obtained by calculation are given priority. In the water heater 2 selected based on the order and selected to be in a flowing state in which hot water flows, the water proportional valve 29 is fully opened, and hot water flows through the hot water 2. Further, in the water heater 2 selected to be in the non-flow state in which the hot water does not flow, the water proportional valve 29 is closed to adjust the flow to the flow stop state, and the hot water is not allowed to flow through the hot water 2. To do. As described above, the open / close state of the bypass valve 25 for all the water heaters 2 through which hot and cold water flows is determined by the switching temperature obtained by subtracting the system mixing temperature Tk from the system setting temperature Ts (the system setting temperature Ts−the system setting temperature). Mixing temperature Tk)
And all the bypass valves 25 are adjusted to the same state.

Then, the number of combustion NK calculated by the calculation
Is selected based on the priority order. In the water heater 2 selected as the heater 2 to be heated, the ventilation operation by the fan 23 is started, and the safety The valve 32 is opened, the switching solenoid valve 34 is appropriately switched, and the gas proportional valve 33 is opened and adjusted to the ignition gas amount.
Is performed, and ignition of the burner 22 is confirmed by the frame rod 36.

Thereafter, in the water heater 2 selected as the heating water heater 2, the temperature of the hot water supplied from the heating water heater 2 to the circulation channel 3 is set to the hot water supply set temperature Th. The heating amount of the burner 22 is adjusted. That is, based on the detection information of the inlet-side thermistor 26 and the flow rate sensor 27 and the information of the hot water supply set temperature Th, the detected temperature of the outlet-side thermistor 30 in each of the open state and the closed state of the bypass valve 25 is determined. Hot water setting temperature Th
Gas proportional valve 33 so that the amount of gas required for
And the switching solenoid valve 34 is adjusted, and the fan 23 is adjusted.
The feed-forward control is performed to adjust the ventilation amount of the fan 23 so that the ventilation amount of the fan 23 becomes an appropriate combustion state with respect to the adjustment gas amount, and the detected temperature of the outlet-side thermistor 30 is set to the set temperature for hot water supply. The feedback control for finely adjusting the opening of the gas proportional valve 33 is executed. When the capacity of the water heater 2 exceeds the capacity, the water proportional valve 29 is throttled to adjust the temperature of the water supplied from the water heater 2 to be heated to the circulation channel 3. In this way, hot water at the hot water supply set temperature Th is supplied to the circulation flow path 2 from the hot water heater 2 being operated for heating, and hot water at the system mixing temperature Ts can be constantly used at the hot water tap 14.

Although not described in detail, each time the operation time of the heats system elapses the set time, the highest water heater 2 is operated.
To the lowest rank, the priorities of the remaining water heaters 2 are moved up one by one, and the priorities of the plurality of water heaters 2 are changed so that the operation time of each water heater 2 becomes uniform, The occurrence of a failure in each water heater 2 is prevented.

In this way, the return path portion 3 of the circulation flow path 3
As the mixing temperature of the hot water flowing from the hot water a to the hot water heater 2, all the inlet-side thermistors 26 of the hot water heater 2 through which the hot water flows
Since the average temperature of the detected temperatures can be obtained, the mixed temperature can be detected while reducing the cost without newly providing a dedicated mixed temperature detecting means for detecting the mixed temperature. Then, based on the obtained mixing temperature, the number of passing flow QK for branching and flowing the fluid to be heated by a set appropriate amount is obtained.
In addition, the number of heating operations that can be heated to the hot water supply set temperature Th with a capacity within the heating capacity is obtained, and the forward path portion 3b of the circulation flow path 3
The hot water supply set temperature Th of the water heater 2 that is operated to heat the hot and cold water to the system set temperature Ts is obtained, and the obtained number of flowing currents QK, the number of combustions NK, and
Since each water heater 2 is controlled to be at the hot water supply set temperature Th, the temperature of the fluid to be heated in the outward path portion 3b of the circulation flow path 3 can be maintained at the system set temperature Ts.

Further, the control device 5 detects detection information of the inlet-side thermistor 26, the heat exchange thermistor 28, and the outlet-side thermistor 30 for detecting the temperature of hot water in the heating flow path 1 in each of the plurality of water heaters 2. When it is determined that the anti-freezing measure is required for the water heater 2 in the non-flowing state of the hot water from the plurality of water heaters 2 on the basis of the above, the anti-freezing operation is executed. To be more specific, among the plurality of water heaters 2, the inlet-side thermistor 26, the heat exchange thermistor 28 of the water heater 2 that is in a non-flowing state of hot water, and
If it is determined that any of the detected temperatures of the outlet side thermistor 30 is required to be freezing or lower than the set temperature, the fluid for changing the water heater 2 for flowing hot and cold water to the water heater 2 requiring the antifreezing measure is used. Execute the heater change control

That is, in the water heater 2 in a non-flowing state in which the water is not flowing, the water stays in the heating flow path 1 of the water heater 2, and as the external temperature decreases, Although there is a possibility that the retained hot and cold water may freeze, the retained hot and cold water is detected by the inlet-side thermistor 26, the heat exchange thermistor 28, and the outlet-side thermistor 30 of the water heater 2 in a non-flowing state. A temperature drop can be detected, and when it is determined based on the detected information that antifreeze measures are required, an antifreeze operation is executed to prevent freezing of hot and cold water.

The anti-freezing operation will be described. Among the water heaters 2 in the non-flowing state, the water proportional valve 29 of the water heater 2 for which it is determined that the anti-freezing action is necessary is changed from the closed state to the open state. At the same time, the water proportional valve 29 of the water heater 2 in the flowing state is switched from the open state to the closed state, and the water heater 2 through which the hot water flows is changed to the water heater 2 requiring anti-freezing measures. A fluid heater change control process is performed.

The above-described fluid heater change control process is repeatedly performed at set time intervals until the anti-freezing measures for all of the plurality of water heaters 2 become unnecessary. That is, among the plurality of water heaters 2, all the detected temperatures of the inlet-side thermistor 26, the heat exchange thermistor 28, and the outlet-side thermistor 30 of the water heater 2 in which the hot water is not flowing exceed the set temperature. Up to the inlet side thermistor 26, the heat exchange thermistor 2
8, and a water heater 2 requiring a freezing prevention measure in which the detected temperature of any one of the outlet side thermistors 30 is lower than or equal to a set temperature.
Is changed to

An outline of the above control operation will be described with reference to the flowchart of FIG. First, the flow number calculation processing, the combustion number calculation processing, and the hot water supply set temperature calculation processing are sequentially executed. That is, the system controller 18 communicates with the water heater controller 37 of each water heater 2, sums the detected flow rates of the flow rate sensors 27 of each water heater 2, and outputs the sum from the return path portion 3 a of the circulation flow path 3. The total flow rate Q, which is the total amount of hot and cold water flowing to the boiler 2, is determined, and the determined total flow rate Q is determined.
Is calculated based on the above [Equation 1], which is the number of flowing water QK, which is the number of flowing water heaters 2 through which hot and cold water flows.

Then, the system controller 18 communicates with the water heater controller 37 of each water heater 2 to
System set temperature Ts, total flow rate Q, and water supply path 9
From the system mixing temperature Tk, which is the temperature of the hot and cold water after the water from the hot water and the hot and cold water circulating through the circulation flow path 3 are mixed. The number of combustion NK, which is the number of heating operations in the boiler 2
Is calculated. Further, the system controller 18 communicates with the water heater controller 37 of each water heater 2 to
Based on the system set temperature Ts, the total flow rate Q, the system mixing temperature Tk, and the combustion flow rate Qn, which is the sum of the flow rate sensors 27 of the heating water heaters, the heating operation is performed by the above [Equation 3]. The hot water supply set temperature Th is calculated so as to supply the hot water from the hot water heater 2 to the circulation channel 3.

Then, it is determined whether or not there is a water heater 2 requiring anti-freezing measures among the plurality of water heaters 2. In other words, the inlet-side thermistor 26, the heat exchange thermistor 28 of the water heater 2 that is in a non-flow state of the hot water among the plurality of water heaters 2,
Then, it is determined whether or not an anti-freezing measure in which the detected temperature of any of the outlet side thermistors 30 is equal to or lower than the set temperature is necessary.

When the necessity of the antifreeze measure is determined in this way, the set time has elapsed since the operation of the heats system was started, or the set time has elapsed since the previous execution of the antifreeze operation. It is determined whether or not it is time to execute the fluid heater change control process, and if it is the time to execute the fluid heater change control process, the water heater 2 through which the hot and cold water flows needs hot water prevention measures. A freezing prevention operation is performed by executing a fluid heater change control process for changing to the heater 2. That is, among the water heaters 2 in the non-flow state, the water proportional valve 2 of the water heater 2 for which the need for the anti-freezing measure is determined.
9 is switched from the closed state to the open state, and the water proportional valve 29 of the water heater 2 in the flowing state is switched from the open state to the closed state.

If the necessity of the anti-freezing measure is not determined, the water heater operation control processing is executed. In other words, the water heater 2 for flowing hot and cold water is selected based on the priority so that the number of flowing water QK obtained by the calculation is obtained, and the water heater 2 selected for the flowing state for flowing hot and cold water is selected. , The water proportional valve 29 is fully opened, and hot water flows through the water heater 2. Further, in the water heater 2 selected to be in the non-flow state in which the water does not flow, the water proportional valve 29 is closed so that the water does not flow through the water heater 2.

Then, the number of combustion NK calculated by the calculation
The water heater 2 to be operated to be heated is selected so that the water heater 2 selected as the heated water heater 2 is as follows.
The ventilation operation by the fan 23 is started, the safety valve 32 is opened, the switching solenoid valve 34 is appropriately switched, and the valve is adjusted to open the gas proportional valve 33 to the ignition gas amount, and the igniter 35 controls the burner 22. The ignition operation is performed, and the ignition of the burner 22 is confirmed by the frame rod 36.

Thereafter, the temperature of the hot or cold water supplied from the hot water heater 2 to the circulation flow path 3 is set to the set hot water supply temperature Th.
In the heating water heater 2, the open or closed state of the bypass valve 25 is determined based on the detection information of the inlet-side thermistor 26, the flow rate sensor 27, and the information of the hot water supply set temperature Th. In each of the states, the detected temperature of the outlet side thermistor 30 is set to the hot water set temperature Th.
Gas proportional valve 33 so that the amount of gas required for
And the switching solenoid valve 34 is adjusted, and the fan 23 is adjusted.
The feed-forward control is performed to adjust the ventilation amount of the fan 23 so that the ventilation amount of the fan 23 becomes an appropriate combustion state with respect to the adjustment gas amount, and the detected temperature of the outlet-side thermistor 30 is set to the set temperature for hot water supply. The feedback control for finely adjusting the opening of the gas proportional valve 33 is executed.

[Another Embodiment] (1) In the above embodiment, the heating operation is performed using the obtained system mixing temperature Tk. However, the obtained system mixing temperature Tk is used. Tk
May be used to determine the necessity of the anti-freezing measure in the circulation channel 3. That is, when the system mixing temperature Tk, which is the obtained mixing temperature, is equal to or lower than the set value, it is determined that anti-freezing measures are necessary in the circulation flow path 3, and the pump unit 8 is operated to circulate hot water through the circulation flow path 3. You may make it flow.

(2) In the above embodiment, the mixing temperature of the hot and cold water flowing from the return path portion 3a of the circulation flow path 3 to the hot water heater 2 is set as the mixing temperature of all the inlet-side thermistors 26 of the hot water heater 2 through which the hot water flows. Although the average temperature of the detected temperatures is obtained, the detected temperature of the inlet-side thermistor 26 in one of the water heaters 2 through which the hot water flows may be obtained as the mixed temperature.

(3) In the above embodiment, as the heating operation, the respective processes of the number of flowing units, the number of combustion units, the hot water supply temperature calculation process, and the water heater operation control process are executed. However, the present invention is not limited to these control processes. That is, for example, while executing each of the number-of-flows calculation process, the number-of-combustions calculation process, the hot water supply set temperature calculation process, and the water heater operation control process, the detected temperature Ti of the outgoing thermistor 19 and the system set temperature Ts are compared. On the basis of the deviation, the heating operation of the plurality of water heaters 2 is performed while changing the number of the water heaters 2 through which the hot water flows so that the detected temperature Ti of the outgoing thermistor 19 becomes the system set temperature Ts. The number may be changed. If the set target temperature of the water heater 2 to be heated is set in advance, the number-of-flows calculation process and the number-of-combustions calculation process are executed so that the calculated number of flow-through numbers and number of combustions are obtained. Water heater operation control processing may be performed.

(4) In the above embodiment, based on the system set temperature Ts, the total flow rate Q, the system mixing temperature Tk, and the combustion flow rate Qn, which is the sum of the flow rate sensors 27 of the water heaters 2 that are being heated. Although the hot water supply set temperature Th is calculated by the above [Equation 3], the hot water supply set temperature Th may be calculated as follows. That is, assuming that the flow rates of the hot and cold water in the water heater 2 through which the hot and cold water flows are the same, the hot water supply set temperature Th is the system set temperature Ts
The number may be calculated by the following [Equation 5] based on the number of flowing air QK, the system mixing temperature Tk, and the number of combustion NK.

[0054]

(Equation 5)

(5) In the above embodiment, the system mixing temperature Ts is obtained by calculation, but a thermistor for detecting the system mixing temperature is circulated downstream of the connection point between the circulation passage 3 and the water supply passage 9. It may be provided in the channel 3.

(6) In the above embodiment, the heating channel 1 is
Heating flow path 1c through which hot water flows by being heated by burner 22
And a bypass passage 24 through which the hot and cold water flows without heating. However, the entire amount of hot and cold water in the heating flow path 1 may be heated by the burner 22 without providing the bypass passage 24. .

(7) In the above embodiment, the open / close state of the bypass valve 25 is adjusted to the same state for all the water heaters 2 through which the hot water flows, but it is not necessarily the same. It is not necessary to adjust the opening and closing states of the bypass valves 25 of the water heater 2 through which the hot water flows.

(8) In the above embodiment, only one pump unit 8 is provided, and the water proportional valve 2 of each water heater 2 is provided.
9, the flow of hot and cold water as the fluid to be heated is interrupted from the circulation flow path 3, but as shown in FIG.
The pump units 8a and 8b may be provided for each, and the units 16 and 17 for flowing hot and cold water may be changed by switching the operation state of the pump units 8a and 8b. In FIG. 5, the same reference numerals as in the above-described embodiment denote the same parts, and a description thereof will be omitted.

(9) In the above embodiment, a plurality of hot water taps 14 are provided as the terminal load M. However, the present invention is not limited to the hot water taps 14 but may be, for example, a floor heating device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a heat source facility.

FIG. 2 is a schematic configuration diagram of a fluid heater.

FIG. 3 is a control block diagram.

FIG. 4 is a flowchart showing a control operation.

FIG. 5 is a schematic configuration diagram of a heat source facility showing another embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heating flow path 2 fluid heater 3 circulation flow path 5 operation control means 8 forced circulation means 9 replenishment means 18, 27, 37 total flow rate detection means 18, 27, 37 heating flow rate detection means 22 heating unit 26 temperature detection means 27 Flow rate detecting means 29 Intermittent means M Terminal load

Continuation of the front page (72) Inventor Hiroshi Yoshimoto 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Inventor Daisuke Konishi 1-1-52, Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Harman Co., Ltd. (72) Inventor Ehiro Torii 1-1-52 Oka, Minami-shi, Minato-ku, Osaka, Osaka Prefecture Harman Co., Ltd. (72) Toshihiro Kawauchi 1-1-52, Oka, Minami-shi, Minato-ku, Osaka, Osaka Stock F term in the company Harman (reference) 3L070 BB01 DD08 DE09 DF06 DF12 DG02

Claims (4)

[Claims] A plurality of fluid heaters for heating a fluid to be heated flowing through a heating channel are provided in a return path portion of a circulation channel for circulating and flowing a fluid to be heated to a terminal load by a feeding action of a forced circulation means. The terminal load is connected in parallel to the circulation flow path in a state where the inlet side of the heating flow path is connected to the heating flow path and the exit side of the heating flow path is connected to the outward path of the circulation flow path. In order to replenish the consumption of the fluid to be heated in the above, a replenishing means is provided for pressurizing and replenishing the fluid to be heated to a portion on the return path portion of the circulation flow passage, which is located on the upstream side of the connection point of the fluid heater. An interrupting means for interrupting the flow of the fluid to be heated from the circulation flow path is provided for each of the plurality of fluid heaters, and a fluid heater for flowing the fluid to be heated by the interrupting control of the interrupting means. While changing the number, Heat source equipment provided with operation control means for performing a heating operation to increase the number of heating operations of the heater as the heat load is larger, wherein the fluid heater, the heating amount to heat the fluid to be heated is Adjustable heating section, flow rate detecting means for detecting the flow rate of the heated fluid flowing through the heating flow path, and temperature detecting means for detecting the temperature of the heated fluid before heating by the heating section The heating unit is adjusted to heat the fluid to be heated to a set target temperature based on the detection information of the flow rate detection unit and the temperature detection unit. A heat source configured to obtain a mixing temperature of a fluid to be heated flowing from the return path portion of the circulation flow path to the fluid heater based on detection information of the temperature detection means in the fluid heater through which the fluid flows. Facility. 2. The operation control unit according to claim 1, wherein the operation control unit is configured to obtain, as the mixed temperature, an average temperature detected by the temperature detection unit in the fluid heater through which the fluid to be heated flows. Heat source equipment. 3. A total flow rate detecting means for detecting a total flow rate of a fluid to be heated flowing from the return path of the circulation flow path to the fluid heater, wherein the operation control means detects the total flow rate detecting means. Based on the information, as the number of fluid heaters through which the fluid to be heated flows, the number of flowing fluids for branching and flowing the fluid to be heated by a set appropriate amount is determined, and the detection information of the total flow rate detecting means and the Based on the mixing temperature, as the number of fluid heaters to be heated, the number of heating operations that can be heated to a set target temperature with a capacity equal to or less than the flow number and within the heating capacity is determined. The heat source equipment according to claim 1 or 2, wherein the heating operation is performed based on the number of streams and the number of heating operations. 4. The heating control device according to claim 1, wherein the heating operation includes: the mixing temperature, a set target supply temperature of the fluid to be heated in a forward portion of the circulation flow path, detection information of the total flow rate detection means, and the heating. The set target temperature of the fluid heater to be heated is determined based on the detection information of the heating flow rate detecting means for detecting the flow rate of the fluid to be heated flowing through the fluid heater to be activated, and the fluid to be heated 4. The apparatus according to claim 3, wherein the heating device heats the fluid to be heated to the set target temperature.
The heat source equipment described in 1.