JP2001153461A - Method of controlling operation of juxtaposition type of power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the hot water supply property by preventing the sudden change of the temperature Tc of supplied hot water even in the case of selectively operating a plurality of heat source machines in a juxtaposition type of hot water supply system. SOLUTION: First and second hot water suppliers 3 and 4 are juxtaposed between a water entry main pipe 1 and a hot water supply main pipe 2. At the time of start of initial hot water supply operation, both of the first and second hot water suppliers are operated until the hot water temperatures Ta and Tb in both hot water delivery pipes 34 and 44. Then, the operation is continued by the number of units geared to hot water supply request capacity. If the temperature difference (Ta-Tb) becomes larger than that in a set range while only the first hot water supplier is operating, an opening and closing valve 47 is opened to raise Tb by compulsively combusting the second hot water supplier regardless of how the hot water supply request capacity is, and it is stopped when the temperature difference comes in the set range. It will do to perform the compulsive combustion of the second hot water supplier for only a slight time after every passage of specified time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control system for realizing a hot water supply characteristic corresponding to a required hot water supply capacity in an installed hot water supply system in which a plurality of heat source units such as a hot water supply unit are provided for a hot water supply pipe. About the method.

[0002]

2. Description of the Related Art Conventionally, as an operation control method of this type of co-installed hot water supply system, a method has been known in which a plurality of heat source units are selectively operated to supply a desired flow rate of hot water. (For example, see Japanese Utility Model Laid-Open No. 5-17413). In this method, when the required flow rate is low, some heat source units are operated and other heat source units are stopped,
The heat source units to be operated are sequentially selected so that the operation time of each heat source unit is substantially equalized.

[0003]

However, in the operation control method of the above-mentioned conventional side-mounted hot water supply system, the water temperature in the pipe of the heat source unit in the halt state decreases with time, and is finally supplied to the heat source unit. The temperature will drop to the same temperature as normal tap water. For this reason, when a certain heat source unit is already in operation and relatively hot water is being supplied, and another heat source unit that has been in a halt state is started to operate, the hot water and the initial operation start. Low-temperature hot and cold water will be mixed. For this reason, for example, the temperature of hot water discharged from hot water or the like fluctuates rapidly to a low temperature side, and the hot water supply characteristics deteriorate. As a result, the user who receives the hot water from the above-mentioned curan or the like is inconvenienced, for example.

The present invention has been made in view of such circumstances, and an object thereof is to provide a hot water supply temperature even when a plurality of heat source units are selectively operated in a co-installed hot water supply system. It is an object of the present invention to provide an operation control method capable of preventing a sudden change in the temperature and improving hot water supply characteristics.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a heat source unit which is stopped and is in a standby state until the next operation is started, so that its internal temperature is maintained within a predetermined range. It is made by paying attention to the fact that operation control is required.

More specifically, the first invention relating to the control at the start of hot water supply operation relates to an installed hot water supply system in which a plurality of heat source units are arranged in parallel between a water inlet pipe and a hot water outlet pipe. The following specific items are provided for the operation control method. That is, first, at the start of the hot water supply operation, the operation of all the heat source units is started to heat the water entering from the water inlet pipe, and the respective detected outlet temperatures are determined in advance by detecting the outlet temperatures of all the heat source units, respectively. The operation of all the heat source units is continued until the temperature reaches the set temperature. Thereafter, while the hot water supply operation is continued only for the number of heat source devices corresponding to the hot water supply request capability, the hot water supply operation of each of the other heat source devices is stopped to be in a standby state.

Here, the "plurality" refers to two or three or more, and the "heat source unit" refers to, for example, a water heater or a water heater.

In the first aspect of the invention, in the operation control method of the co-installed hot water supply system in which a plurality of heat source units are selectively operated in accordance with the required hot water supply capability, when starting the first hot water supply operation, The initial setting of heating the internal temperature of the heat source device to a predetermined temperature is performed.

[0009] A second aspect of the invention relating to the heat retention control of a heat source unit in a standby state is an operation of an installed hot water supply system in which a plurality of heat source units are arranged in parallel between an inlet pipe and a tapping pipe. The following specific items are provided for the control method. That is, while the hot water supply operation is continued for the number of heat source devices corresponding to the hot water supply request capability, the internal temperature of each heat source device in the standby state in which the hot water supply operation is stopped is detected, and the detected internal temperature and the above hot water supply operation When the temperature difference between the continuing hot water supply set temperature of each heat source unit and the temperature difference limit value set in advance becomes larger than the preset temperature difference limit value, hot water supply is temporarily performed for each heat source unit in the standby state regardless of the hot water supply request capability. It is a specific matter to drive the vehicle.

Here, "the internal temperature of each heat source unit" refers to the temperature of hot water that has been heated at the outlet side of each heat source unit by heating the water that has entered through the water inlet pipe. Further, the “water supply set temperature” is a temperature set for hot water supply to the heat source device during the hot water supply operation, and the heat source device is operated to supply the hot water at the hot water supply set temperature.

In the case of the above second invention, after the hot water supply operation is started, the number of heat source devices satisfying the required hot water supply capability is supplied according to the required hot water supply capability, and the remaining number of heat source devices are in a standby state ( (Hot water supply operation stopped state). At this time, the internal temperature of each of the heat source units in the standby state is detected. If the temperature difference between the detected internal temperature and the set temperature of tapping of the heat source unit during the hot water supply operation is larger than the temperature difference limit value, the standby state is set. Regarding the heat source unit, the hot water supply operation is forcibly performed temporarily regardless of the hot water supply request capability. The execution of this temporary hot water supply operation raises the internal temperature of each heat source unit that was in the standby state until then, and the internal temperature of each heat source unit becomes the same as the hot water temperature from the heat source unit that has been in the hot water supply operation until then. It is ensured that the temperature is kept in a constant temperature range without a significant temperature difference. For this reason, even if the heat source unit in the standby state is to be subjected to additional hot water supply operation in accordance with the required hot water supply capability, fluctuations in hot water supply temperature from, for example, curan or the like are suppressed to a minimum to improve the hot water supply characteristics. Can be achieved.

In the second invention, the following control may be employed as control for forcibly starting the hot water supply operation of each heat source unit in the standby state and then stopping the hot water supply operation. That is, after the hot water supply operation of each heat source unit in the standby state is started, a change in the temperature difference between the detected internal temperature and the set temperature for tapping is monitored, and for each heat source unit in which the hot water supply operation is started, the temperature difference is set in advance. When the temperature becomes lower than the set temperature difference allowable value, the hot water supply operation may be stopped to return to the standby state. Thus, while minimizing unnecessary hot water supply operation unrelated to the hot water supply capacity, the temperature difference is surely maintained within a certain range to minimize the above-mentioned fluctuation of the hot water supply temperature and improve the hot water supply characteristics. The effect of achieving the above can be obtained more reliably.

[0013] Further, a third aspect of the present invention relating to another heat-retention control of a heat source unit in a standby state is a co-installed hot water supply system in which a plurality of heat source units are arranged in parallel between an inlet pipe and an outlet pipe. The following specific items are provided for the operation control method. In other words, after the hot water supply operation is started, while the hot water supply operation is being performed for the number of heat source devices corresponding to the hot water supply request capability, each of the heat source devices in the standby state in which the hot water supply operation is stopped is in a standby state in which the standby state is continued. The duration is monitored, and when the standby duration reaches a preset duration set in relation to the temperature drop of the hot and cold water and the elapsed time, regardless of the hot water supply capability, each of the heat source units in the standby state is operated. It is a specific matter to perform the hot water supply operation temporarily.

Here, "monitoring of elapsed time" may be performed by an electronic timepiece or the like provided in a microcomputer having a CPU generally used as a controller.

In the case of the third invention, after the hot water supply operation is started, the number of heat source devices satisfying the required hot water supply capability is operated in accordance with the required hot water supply capability, and the remaining number of heat source devices are in a standby state (hot water supply). (Operation stopped state). At that time, the standby duration of each heat source unit in the standby state is monitored,
When the standby duration reaches the set duration, the hot water supply operation is temporarily performed forcibly on the heat source unit in the standby state regardless of the hot water supply request capability. The execution of this temporary hot water supply operation raises the internal temperature of each heat source unit that has been in the standby state until then, so that the same operation as the operation according to the second invention is obtained, and the inside of the standby state is Since the detection is not required, the control is simpler than in the case of the second aspect, and a sensor for detecting the temperature can be omitted.

Also in the third aspect of the invention, the following control may be employed as the control for stopping the hot water supply operation after the hot water supply operation of each heat source unit in the standby state is started. That is, the operation elapsed time from the start of the hot water supply operation of each of the heat source units in the standby state is monitored, and for each heat source device that has started the hot water supply operation, the operation elapsed time is the internal temperature of the heat source unit due to the start of the hot water supply operation. When the predetermined elapsed time has elapsed in relation to the rise in the temperature and the elapsed time from the start of the hot water supply operation, the hot water supply operation may be stopped to return to the standby state.

[0017]

As described above, according to the operation control method for the co-installed hot water supply system according to the first aspect, a plurality of heat source units are selectively operated for hot water supply according to the required hot water supply capacity. Even when the first hot water supply operation is started, it is possible to perform the initial setting of heating the internal temperatures of all the heat source units to a predetermined temperature, and to add the heat source units in the standby state. Even when the operation is started, it is possible to reliably prevent a sudden change in the overall hot water supply temperature and improve the hot water supply characteristics.

According to the operation control method for the co-installed hot water supply system according to claim 2 or 3, the internal temperature of each heat source unit in the standby state is determined by the temperature of the hot water from the heat source unit during the hot water supply operation and the surplus. Even if the heat source unit in the standby state is operated for additional hot water supply according to the hot water supply request capacity, the sudden change of the whole hot water supply temperature can be surely maintained. Thus, the hot water supply characteristics can be improved.

According to the operation control method for a co-installed hot water supply system according to claim 4 or 5, an effect similar to the effect of the second invention can be obtained by simpler control than the case of the second invention. In addition to this, a sensor for detecting temperature and the like can be omitted, so that cost can be reduced and the configuration can be simplified.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 shows a hot water supply system to which an operation control method of an installed hot water supply system according to a first embodiment of the present invention is applied. This hot water supply system
Inlet main pipe 1 as "inlet pipe" described in claims
Similarly, a plurality (two in the illustrated example) of water heaters 3 and 4 as heat source units are arranged in parallel between a hot water supply main pipe 2 as a "hot water supply pipe". In addition, at the time of hot water supply operation, the first water heater 3 which is a specific water heater is mainly operated, and the second water heater 4 which is the other water heaters is selectively operated according to the required hot water supply capacity. It has become. That is, the first water heater 3 plays a role as a main water heater, and the second water heater 4 plays a role as an auxiliary auxiliary water heater. Hereinafter, a case will be described in which the operation control method of the present invention is applied to such a hot water supply system to improve the characteristics of hot water supply from hot water supply main pipe 2. Further, as the first and second water heaters 3 and 4, those having different hot water supply capacities may be used, or those having the same hot water supply capacities may be used. The case where the first and second water heaters 3 and 4 have the same hot water supply capability will be described.

The first water heater 3 is provided with a heat exchanger 31, a combustor 32 for heating the heat exchanger 31, and a pressurized tap water having an upstream end connected to the water inlet main pipe 1. A water inlet pipe 33 for entering the heat exchanger 31 and a tapping pipe 34 whose downstream end communicates with the hot water supply main pipe 2 and supplies hot water heated by the heat exchanger 31 to the hot water supply main pipe 2. Have. In addition, the tapping pipe 34 is provided with the tapping pipe 34.
A first temperature sensor 35 for detecting the temperature of hot water inside is provided. The tapping pipe 34 is connected to the hot water supply main pipe 2 at a connection point 36.
An electromagnetic first opening / closing valve 37 for opening and closing the tapping pipe 34 is interposed in the tapping pipe 34 on the further upstream side.

Similarly to the first water heater 3, the second water heater 4 has a heat exchanger 41, a combustor 42, and a water inlet pipe 43 whose upstream end is connected to the water inlet main pipe 1; A downstream end is provided with a tapping pipe 44 connected to the hot water supply main pipe 2. Each of these components 41 to 44 has the same configuration as each of the components 31 to 34 of the first water heater 3, and the tapping pipe 44 has a second configuration for detecting the temperature of hot water inside the tapping pipe 44. A temperature sensor 45 is provided. The tapping pipe 44 is firstly connected to the hot water supply main pipe 2 at a junction 46.
The hot water from the water heater 3 is merged with the hot water, and a second electromagnetic opening / closing valve 47 for opening and closing the hot water pipe 44 is interposed in the hot water pipe 44 upstream of the junction 46. I have.

Further, the downstream end of the hot water supply main pipe 2 is connected to one or more currans 51, 52, and
When the user performs an opening operation, hot water can be used.

The first and second temperature sensors 35 and 45 are connected to the on-off valves 37 and 4 from the heat exchangers 31 and 41, respectively.
It is sufficient that the temperature of the hot and cold water inside the tapping pipes 34 and 44 up to 7 can be detected, and the disposition position may be either inside or outside each of the water heaters 3 and 4. Therefore, even if each of the temperature sensors 35 and 45 provided in the tapping pipes 34 and 44 located inside the water heaters 3 and 4 is used,
Further, each of the on-off valves 3 outside the water heaters 3 and 4 and
What is provided for each tapping pipe 34, 44 extending to 7, 47 may be used.

As shown in FIG. 2, the controller 6 for controlling the operation of the hot water supply system having the above-described structure includes the first controller.
First water heater operation control means 61 for controlling the operation of water heater 3
A second water heater operation control means 62 for controlling the operation of the second water heater 4; and a second water heater operation control means 62 for improving the hot water supply characteristics based on both temperature detection values from the first temperature sensor 35 and the second temperature sensor 45. A hot water supply characteristic control unit 63 that realizes the operation control method according to the present invention by performing operation control is provided.

The first water heater operation control means 61 opens the on-off valve 37 when any one or more of the above-mentioned currans 51, 52 is opened, and a flow sensor (not shown) detects a flow rate exceeding a predetermined minimum operation flow rate. In response to the flow rate detection, the combustor 32 is caused to perform a combustion operation.
A hot water supply operation is performed in which the incoming water from the hot water is heated to a predetermined set temperature and supplied to the hot water supply main pipe 2 through the hot water supply pipe 34.

The second water heater operation control means 62 operates in a state where one or more of the above-mentioned currans 51, 52 is opened and the first water heater 3 is executing the hot water supply operation, and the second water heater characteristic control means 63 is provided. When the on-off valve 47 is opened, the combustor 42 is caused to perform a combustion operation upon receiving a flow rate detection equal to or higher than the minimum operation flow rate or upon receiving a forced combustion command from the hot water supply characteristic control means 63. . Thereby, the incoming water from the water inlet pipe 43 is heated, and the heated hot water is merged with the hot water from the first water heater 3 in the hot water main pipe 2 through the hot water pipe 44.

The hot water supply characteristic control means 63 controls the hot water supply demand capacity (number of hot water demands) set by the user as normal control.
If the number of hot water demands can be achieved by the hot water supply operation of only first water heater 3 based on the above, while the hot water supply operation by only first water heater 3 is continued, the number of hot water demands is reduced by first water heater 3 If only the hot water supply operation is insufficient, the second water heater 4
Is also added to the first water heater 3 to perform a hot water supply operation. Here, the “number” refers to one liter of water
The amount of heat required to raise the temperature by 25 ° C.
00kJ / h (1,500kcal / h)
No. For example, 126,000 kJ / h (3
No. 20 is set as a number which gives a calorific value of (0000 kcal / h).

In addition, the hot water supply characteristic control means 63 controls the supply of hot water by the first water heater 3 in order to improve the hot water supply characteristics when executing / stopping the hot water supply operation of the second water heater 4 in accordance with the required hot water supply capacity. Start control at the start of the operation, and heat retention for maintaining the water temperature on the tapping pipe 44 side of the second water heater 4 (the internal water temperature of the second water heater 4) in a predetermined range during the hot water supply operation using only the first water heater 3. Control.

The starting control by the hot water supply characteristic control means 63 will be described with reference to the flowchart of FIG. 3. First, it is determined whether or not the hot water supply operation of the first water heater 3 has been started (step S1). Is started, the second opening / closing valve 47 is opened to operate the second water heater 4 (steps S2 and S3). Then, the combustion operation of the first and second water heaters 3 and 4 is continued until the detected temperature value Tb from the second temperature sensor 45 reaches a preset set temperature value Tt (steps S4, S2, S3). . This set temperature value Tt
As described below, even if the operation of the second water heater 4 is stopped and the second water heater 4 is additionally operated during the water heating operation of only the first water heater 3, the first water heater 3 The temperature difference between the hot water and the temperature Ta of the hot water is very small.
The temperature value may be set so that the temperature fluctuation of the hot and cold water from the hot water 1 and 52 does not make the user uncomfortable. It should be noted that the tap water temperature value Ta on the first water heater 3 side is the same as the detected temperature value Tb or on the high temperature side, so that the determination is omitted. Here, when the hot water supply operation is started simultaneously for all the number of hot water heaters 3 and 4, the outlet temperature of one of the hot water heaters 3 or 4 or the hot water temperature of all the hot water heaters 3 and 4 is detected. In this case, the above-described determination may be performed.

If the detected temperature value Tb rises to the set value Tt, then the number of operating units required for the required hot water supply capacity is determined, that is, in the case of the present hot water supply system, the first water heater 3
It is determined whether or not only the hot water supply operation can satisfy the hot water supply request capability (step S5). This determination indicates the required hot water supply capacity by the actual number of hot water that is actually supplied in the hot water supply operation by the first and second hot water supply apparatuses 3 and 4 up to that time. The comparison is performed by comparing the maximum performance with the maximum number of hot water baths as the maximum performance of 3. Specifically, the left side portion of the following equation is calculated, and the above determination is made by comparing the value (%) of the left side portion with the determination value α (%).

[0033]

(Equation 1) If the value on the left side of the above equation is equal to or smaller than the determination value α, it is determined that the hot water supply capability can be satisfied by one hot water supply operation of only the first water heater 3 while the value on the left side is the determination value α. If it is larger than this, it is determined that one hot water supply operation is insufficient and that the first and second two water heaters 3 and 4 need hot water supply operation. Here, the determination value α is, for example, 90 to 9
A value of about 5% may be set.

If it is determined in step S5 that the hot water supply operation by the two water heaters 3 and 4 is necessary, the first water heater 3
In addition to the above, while the hot water supply operation of the second water heater 4 is continued (steps S5, S2, S3, S4), if it is determined that the hot water supply operation by one water heater 3 is sufficient, the second opening / closing valve 47 is closed. To stop the hot water supply operation of the second water heater 4 (step S
6, S7).

With the above-described start-time control, when the hot water supply operation is started by the present hot water supply system for executing / stopping the hot water supply operation of the second water heater 4 in accordance with the required hot water supply capacity,
Initial setting is performed in which the internal temperature of the water heater 4 is heated to a predetermined temperature.

Next, the heat retention control by the hot water supply characteristic control means 63 will be described with reference to a flowchart shown in FIG. 4. First, only one of the first water heaters 3 is operated for hot water supply, and the other second water heater 4 is operated. The current temperature difference (Ta−Tb) obtained by subtracting the temperature value Tb detected by the second temperature sensor 45 from the temperature value Ta detected by the first temperature sensor 35 on condition that the hot water supply operation is in a standby state in which the hot water supply operation is stopped (step S11). ) Is larger than a preset temperature difference limit value V1 (step S12).

If the current temperature difference is smaller than the temperature difference limit value V1, the operation of only one hot water supply by the first water heater 3 is continued, while the current temperature difference is reduced to the temperature difference limit value V1. If it becomes larger, the following processing is performed to increase the internal temperature of the second water heater 4.

That is, the second opening / closing valve 47 is opened and the second water heater 4 is forcibly burned to raise the temperature of the water in the tapping pipe 44 irrespective of the hot water supply capacity (step S).
13, S14). This forced combustion is performed until the temperature difference (Ta−Tb) becomes smaller than the preset temperature difference allowable value V2 (steps S15, S13, S1).
4) If Tb rises until the temperature difference (Ta−Tb) becomes smaller than the temperature difference allowable value V2, the second on-off valve 47
Is closed to stop the combustion operation of the second water heater 4 (steps S16, S17).

The temperature difference limit value V1 may be set as follows. That is, when the temperature difference (Ta−Tb) becomes larger than a certain limit, when the additional operation of the second water heater 4 is started, the hot water is merged with the hot water from the first water heater 3 which has been continuously operated up to that point. , 52, the temperature Tc of the hot and cold water fluctuates to the low temperature side to a degree unpleasant for the user. Therefore, the value of V1 may be set so that the variation in the temperature Tc does not cause any discomfort to the user even if there is some variation in the low temperature side. In addition, as the temperature difference allowable value V2, although the second water heater 4 is shut down and its internal temperature (the temperature in the tapping pipe 44) gradually decreases over time, In the same manner as described above, even when the hot water supply 4 is additionally operated, even if there is some fluctuation in the low-temperature side of the hot water temperature Tc from the currants 51 and 52, it is set so that the user is not disturbed. do it.

With the above-mentioned heat retention control, the internal temperature of the second water heater 4 is surely maintained in a constant heat retaining range, and even if the additional operation is executed in the standby state of the second water heater 4, the curl 5 is maintained.
Fluctuation of the tapping temperature Tc from the outlets 1 and 52 can be minimized to improve the hot water supply characteristics.

<Second Embodiment> FIG. 5 is a flowchart of the heat retention control for realizing an operation control method according to a second embodiment of the present invention. The second embodiment is based on the premise of the configuration of the hot water supply system and the controller 6 of the first embodiment, and employs a control different from that of the first embodiment only for the heat retention control by the hot water supply characteristic control means 63.

That is, steps S21 to S24 are performed in step S1 in the heat retention control of the first embodiment.
After performing the same steps 1 to S14 (see FIG. 4), it is determined whether or not the forced combustion state of the second water heater 4 has elapsed for a set time t (for example, 30 seconds) (step S25).

If the set time t has not elapsed, the forced combustion of the second water heater 4 in steps S23 and S24 is continued, and if the set time t has elapsed, the second on-off valve 47 is closed and the second open / close valve 47 is closed. The forced combustion of the water heater 4 is stopped (step S2
6, S27).

That is, the heat retention control of the first embodiment stops the heat retention operation of the second water heater 4 on condition that the temperature difference (Ta−Tb) becomes smaller than the temperature difference allowable value V2. In the heat retention control in the second embodiment, the stop of the heat retention operation of the second water heater 4 is conditioned on the lapse of the set time t of the combustion operation, and on the condition of a change in the actual temperature difference. The second embodiment is different from the first embodiment in that the process is performed on condition that the time elapses. Therefore, the second embodiment is useful in that control can be simplified.

As the set time t, a time value required for the temperature difference (Ta−Tb) in the first embodiment to become smaller than the temperature difference allowable value V2 may be set.
Specifically, tapping pipe 44 by the combustion operation of second water heater 4
Since the correlation between the temperature rise degree of the hot water in the inside and the elapsed time required for the temperature rise almost corresponds to each other, it is theoretically determined in consideration of various fluctuation factors, or as previously determined by a test. do it.

In the second embodiment, the actual temperature difference (Ta-Tb) exceeds the temperature difference limit value V1 as a condition for starting the forced combustion of the second water heater 4 (step S22). However, the present invention is not limited to this, and the temperature difference condition may be based on time similarly to the above-described forced combustion stop condition. In this case, if the standby continuation time during which the standby state is continued from the time when the second water heater 4 was last operated and stopped reaches a predetermined set continuation time value (for example, 10 min), the second water heater 4 What is necessary is just to start forced combustion. For example, the second water heater 4 may be forcibly burned for 30 seconds every 10 minutes. By doing so, the temperature detection by the first temperature sensor 37 and the second temperature sensor 47 can be made unnecessary, and the temperature sensors 37 and 47 can be omitted in addition to simplifying the control.

<Other Embodiments> The present invention relates to the first embodiment.
The present invention is not limited to the second embodiment, and includes various other embodiments. That is, in the first and second embodiments, the case where the first water heater 3 plays the role of the main water heater and the second water heater 4 plays the role of the auxiliary water heater, respectively, is not limited thereto. Without
The operation of all or two or more water heaters may be selectively controlled without distinguishing between the main and sub water heaters.
In this case, in the above embodiment, the first and second
Both open / close valves 37 and 47 of each of the hot water heaters 3 and 4 are controlled by the hot water supply characteristic control means 63 and the first and second water heaters 3 and 4 are controlled.
The operation of Step 4 may be alternately performed. Also, 3
When the number of hot water heaters is equal to or greater than the number of hot water heaters, the hot water heaters to be operated for hot water supply may be sequentially rotated so as to equalize the operation time of each of the hot water heaters. In addition,
In the case where the first water heater 3 functions as the main water heater and the second water heater 4 functions as the sub water heater as in the first and second embodiments, it is the main water heater. The first opening / closing valve 37 on the first water heater 3 side is unnecessary, and can be omitted.

In the first and second embodiments, the required number of hot water heaters for hot water supply operation is determined and determined so as to satisfy the required number of hot water supply requests. May be the condition for determining the required number. In this case, the required number of hot water heaters is determined so as to satisfy both the number of required hot water and the required flow rate of hot water supply, and the determined required number of hot water heaters are operated for hot water supply.

In the first embodiment, the temperature difference (Ta−Tb) is compared with the temperature difference limit value by using the temperature detection values Ta and Tb obtained by the first and second temperature sensors 35 and 45 in the heat retention control. And the temperature difference (Ta−Tb) is compared with the temperature difference allowable value. However, the temperature difference to be monitored is not limited to the temperature difference. The temperature difference (Ts-Tb) may be compared with the temperature difference limit value or the temperature difference allowable value by using the tapping set temperature Ts of the first water heater 3 during the hot water supply operation instead of Ta. That is, in the first water heater 3, the combustion operation amount of the combustor 3 is determined based on the tap water temperature set value Ts, and as a result of being heated by this combustion operation, the tap water temperature of the tap water from the tap water pipe 34. Is controlled to be Ta, so that Ta is equal to Ts during the hot water supply operation is continued. For this reason, the temperature difference (Ts-Tb) is used instead of the temperature difference (Ta-Tb) of the first embodiment.
The same operation and effect as in the first embodiment can be obtained by using Tb). In addition, in such a case, since the temperature detection from the first temperature sensor 35 becomes unnecessary, the control itself is further simplified.

Although the first and second embodiments have been described with respect to the case of the hot water supply system in which tap water is supplied from the water inlet main pipe 1 and hot water is supplied to the currants 51 and 52 through the hot water main pipe 2, Not limited to this, the operation control method of the present invention may be applied to a circulation type hot water supply system. In this case, after supplying high-temperature hot water to, for example, a heating facility through the hot-water supply main pipe 2, low-temperature water whose temperature has been reduced by heat consumption in the heating facility or the like is returned to the heat source device side through the water main pipe 1. What should I do?

Further, in the first and second embodiments,
The first and second on-off valves 37 and 47 are disposed on the side of the tapping pipes 34 and 44 of the water heaters 3 and 4, but are not limited thereto, and the water inlet pipes 33 of the water heaters 3 and 4 are provided. , 43 may be arranged. Even in this case, the first and second
The same control as in the embodiment can be applied, and the same operation and effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a hot water supply system to which a first embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a controller.

FIG. 3 is a flowchart showing start-time control by hot water supply characteristic control means.

FIG. 4 is a flowchart showing the heat retention control by the hot water supply characteristic control means.

FIG. 5 is a flowchart illustrating heat retention control by a hot water supply characteristic control unit according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main water inlet (water inlet pipe) 2 Main hot water supply pipe (hot water supply pipe) 3 1st water heater (heat source unit) 4 2nd water heater (heat source unit) 35 1st temperature sensor 45 2nd temperature sensor 47 2nd opening / closing valve

Claims (5)

[Claims] 1. An operation control method for an installed hot water supply system in which a plurality of heat source units are disposed in parallel between a water inlet pipe and a hot water outlet pipe, wherein all the heat source units are operated at the start of the hot water supply operation. Start and heat the water entering from the inlet pipe, and operate the operation of all the heat source units until each of the detected outlet temperatures rises to a predetermined set temperature by detecting the outlet temperatures of all the heat source units, respectively. Continuously, after that, the hot water supply operation is continued only for the number of heat source units corresponding to the hot water supply request capacity, while the hot water supply operation of each of the other heat source units is stopped and put into a standby state. Operation control method for the hot water supply system. 2. An operation control method for a co-installed hot water supply system in which a plurality of heat source units are arranged in parallel between a water inlet pipe and a hot water outlet pipe, wherein the number of heat source units corresponding to the required hot water supply capacity is determined. While the operation is continued, the internal temperature of each heat source unit in a standby state in which the hot water supply operation is stopped is detected, and a temperature difference between the detected internal temperature and the set temperature of hot water supply of each heat source unit during the continuous hot water supply operation is detected. When the temperature becomes larger than a preset temperature difference limit value, the hot water supply operation is temporarily performed for each heat source unit in the standby state regardless of the hot water supply request capability. Operation control method for hot water supply system. 3. The operation control method for a co-installed hot water supply system according to claim 2, wherein after the hot water supply operation of each of the heat source units in the standby state is started, a change in a temperature difference between the detected internal temperature and the set temperature of tap water is monitored. Then, for each heat source unit in which the hot water supply operation has been started, when the temperature difference becomes smaller than a preset temperature difference allowable value, the hot water supply operation is stopped and returned to a standby state. Operation control method for hot water supply system. 4. An operation control method for an installed hot water supply system in which a plurality of heat source units are arranged in parallel between a water inlet pipe and a hot water outlet pipe, wherein the hot water supply operation starts after the hot water supply operation is started. While the hot water supply operation is being continued for the number of heat source units, the standby duration for which the standby state is continued for each of the heat source units in the standby state where the hot water supply operation is stopped is monitored. When a set continuation time set in advance in relation to the temperature drop and the passage of time is reached, the hot water supply operation is temporarily performed for each of the heat source units in the standby state regardless of the hot water supply request capability. The operation control method of the co-installed hot water supply system. 5. The operation control method for a co-installed hot water supply system according to claim 4, wherein the operation of the hot water supply unit in a standby state is monitored for an elapsed time from the start of the hot water supply operation, and the hot water supply operation is started. For each heat source unit, when the operation elapsed time reaches a predetermined set time in relation to a rise in the internal temperature of the heat source unit due to the start of the hot water supply operation and a lapse of time from the start of the hot water supply operation, the hot water supply operation is stopped. An operation control method of a co-installed hot water supply system, which is caused to return to a standby state.