JPH07133957A - Hot water supplying device - Google Patents

Abstract

PURPOSE:To prevent unequal load of output hot water volume generated between hot water supplying machines by taking the flow rate wherein the specific flow rate is added to the mean flow rate wherein the total flow rate is divided by the operating numbers as the control flow rate of the hot water supplying machines, so as to command a flow rate control valve in the hot water supplying devices wherein a plurality of hot water supplying machines are parallely connected to each other. CONSTITUTION:The input water temperature of supplying water measured by a temperature sensor 21, the setting situation of the output hot water temperature by remote controllers 6 and the input water volume detected by a water volume sensor 22 are respectively input into a number controller 5, and the total flow rate of the hot water supplying device is calculated by the sum of the input water volume, and also the required total calorific value is calculated by the input water temperature, the set temperature and the total flow rate. Moreover, the operating numbers are calculated by the calculated required total calorific value and the capability of the hot water supplying machines 2. Next, the value wherein the specific flow rate is added to the mean flow rate wherein the total flow rate is divided by the operating numbers are calculated as the control flow rate of respective hot water supplying machines 2, and flow rate control valves 23 of respective hot water supplying machines 2 are commanded by this control flow rate. Thereby, when the faucet opening is increased, the actual output hot water volume can be increased to the control flow rate. before the faucet opening is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply system in which a plurality of hot water supplies are connected in parallel and a part or all of the controlled hot water supplies are operated to discharge hot water.

[0002]

2. Description of the Related Art A conventional hot water supply apparatus is one in which a plurality of water heaters are connected in parallel and a large amount of hot water is discharged by operating some or all of the water heaters according to the total amount of hot water discharged. In order to evenly divide the total flow rate of the water heater into the different water heaters so that the burden of combustion operation is equalized, the hot water supply pipe or water supply pipe of each water heater was provided with a manual adjustment valve for adjusting the flow rate. And
At the site, the difference in pressure loss of each water heater was adjusted by a manual adjustment valve so that the amount of hot water discharged from each water heater was equal.

[0003]

In order to automate the adjustment of the pressure loss of each water heater by omitting the work of adjusting the manual adjustment valve of each water heater at the site where this conventional water heater is installed, each water heater of the water heater is to be solved. Each water heater is equipped with a flow control valve that controls the amount of hot water discharged, and the current total flow rate is divided into equal parts by the number of hot water heaters of the same type. The amount of hot water discharged from each water heater can be made equal by adjusting the difference in pressure loss. However, if you try to increase the total amount of hot water discharged from the water heater by increasing the valve opening of the hot water run during hot water discharge or opening another hot water run, the flow rate is first detected and calculated as the control flow rate. Since it is controlled to 1, the disadvantage is that the amount of hot water discharged cannot be increased beyond the control flow rate. In addition, when the valve opening of the hot water currant during tapping is reduced, the total flow rate decreases and the control flow rate is changed to that value. Since the flow rate is suppressed on the side, the reduced flow rate cannot be increased. That is, the flow rate can only be reduced unilaterally.

[0004]

In order to solve the above-mentioned problems, a hot water supply apparatus according to the present invention has a plurality of water heaters connected in parallel, and a part or all of the controlled water heaters are operated to discharge hot water. In this case, a flow rate obtained by adding a predetermined flow rate to an average flow rate obtained by dividing the total hot water discharge amount by the number of operating units is commanded to the flow rate control valve as the control flow rate of the water heater. Also, when a plurality of water heaters are connected in parallel and all of the water heaters to be controlled are operating and in a hot water discharge state, a value obtained by adding a predetermined flow rate to the average flow rate obtained by dividing the total amount of hot water discharge by the number of operating water heaters, and the A hot water supply apparatus that compares the value of the maximum flow rate obtained on the basis of the amount of heat that can be supplied and uses a smaller value as the control flow rate to instruct the flow rate control valve of the water heater is desirable.

[0005]

In the hot water supply apparatus of the present invention having the above configuration, the calculated control flow rate is increased by the predetermined flow rate with respect to the current flow rate, so the actual hot water discharge amount is determined by the opening degree of the calan. As a result, the control flow rate is always set to be higher than the actual hot water discharge amount, so that it may be necessary to increase the calan opening degree, or, for example, once to reduce the calan opening degree and then increase it again. However, the actual hot water discharge amount is increased up to the control flow amount before the increase of the currant opening, and at the same time, a new control flow amount is calculated from the increased actual hot water discharge amount. Therefore, the amount of hot water discharged always increases to the curran opening or the maximum opening of the flow control valve. Further, in the water heater of the second invention, the calculated control flow rate does not exceed the maximum flow rate obtained on the basis of the heat quantity that can be supplied by each water heater when all the water heaters are operated. It is possible to prevent the water heater from exceeding its capacity.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hot water supply device of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a hot water supply device. This hot water supply device 1 includes a plurality of n water heaters 2, 2, ...
And the water supply pipe 3 of the water pipe connecting these water heaters in parallel
Setting the hot water temperature, etc., in order to control the water supply individually by connecting the hot water supply pipes 4 and the water heaters 2, 2 ... Depending on the situation, the number of operating water heaters that start operating may be summarized, and a unit number control device 5 having a control function unit that controls the temperature and amount of tap water to be tapped, and tap water that is connected to this unit control device 5 It consists of remote controllers 6 and 6 for inputting setting conditions such as temperature. In the water heater 2, a unit number control device 5
A burner controller 20 for controlling the hot water supply operation of each water heater 2 is provided in accordance with the command from. The burner controller 20 includes a temperature sensor 21 for measuring the incoming water temperature of the supply water, a water amount sensor 22 for detecting the amount of discharged hot water, an opening / closing valve 23 for opening and closing the flow path, and a flow control valve 25 for adjusting the amount of discharged hot water.
Are connected.

The unit number control device 5 manages the set temperature from the remote controller 6 and controls the number of operating units. Each burner controller 20 controls the on-off valve 23, and controls the combustion state above the set temperature, the temperature sensor 21 and the water amount sensor 22, the proportional control valve 24 of the combustion burner, and the burner sent from the unit number control device 5. Drive control of the gas supply unit and the air supply unit in the water heater is performed by a combustion sensor or the like for detection. Reference numeral 26 is a main solenoid valve that controls the opening and closing of the gas flow path.

Next, the control operation of the unit number control device 5 for instructing the control flow rate to the flow rate control valve 23 of each water heater 2 will be explained based on FIG. 2 showing a flow chart. First, when the power supply to the unit number control device 5 is turned on, individual data of the water heater 2 and a predetermined flow rate α used for flow rate control described later are input in step S1. The individual data is set in advance when there are individual differences due to the type of water heater and the heat capacity and pressure loss, and may be set once for the same type of water heater.
At the time of start, each flow rate control valve 25 is set to be fully open. Then, in step S2, the water input amount detected by the water amount sensor 22 of each water heater is transmitted to the number-of-units control device 5 via the burner controller 20, and in step S3, the total flow amount Q _T of the water heater is calculated from the sum of the water input amounts. . Next, the water temperature at the water supply pipe 3 detected by the temperature sensor 21 in step S4 and the setting conditions such as the set temperature in step 5 are similarly transmitted to the unit number control device 5. In step S6, the number n of operating units is calculated from the required total heat quantity obtained from the incoming water temperature, the set temperature, and the total flow rate Q _T and the capacity of the water heater. This calculation method is a method of dividing the required total heat amount by the heat amount of the same water heater, but as another method, if the water heaters of different types etc. There is a method of obtaining the amount of heat by comparing the amount of heat with the required amount of heat. next,
A value obtained by adding a predetermined flow rate α to the average flow rate obtained by dividing the total flow rate Q _T calculated in step S3 by the operating number n is calculated in step S7 as the control flow rate Q _X of each water heater, and the control flow rate Q calculated in step S8. _X is each flow control valve 23
Command to. As a result, the flow rate control valve 23 is set to a control flow rate obtained by adding a predetermined amount α to the actual amount of hot water discharged, and when the callan opening is increased, for example, once the callan opening is once decreased and then the callan is opened again. Even if the amount of hot water is increased, the actual amount of hot water is increased up to the control flow rate before the opening of the Karan opening, and at the same time, a new control flow rate is calculated by the actual amount of hot water after the increase, and the amount of hot water is constantly increased. .

Further, simultaneously with this control, a process for preventing the capacity of the water heater from being over-capacity (a state in which the desired hot water discharge temperature cannot be obtained due to too much water input) will be described with reference to the flowchart of FIG. It should be noted that steps S1 to S7 are the same as those in the above-described embodiment. Then, after calculating the control flow rate of each water heater in step S7, it is confirmed in step S8 whether all the water heaters are operating, and if some of the water heaters are operating, it is calculated in step 9 first. The control flow rate Q _X is directly commanded to the flow rate control valve 23. When all the water heaters are operating, first, in step S10, the maximum water heater flow rate Q _MAX is calculated. The calculation method is to find the maximum flow rate by dividing the maximum heat supply amount of the water heater by the temperature difference between the set temperature and the incoming water temperature and the number of operating units. Next in step S11
Then, the previously calculated control flow rate Q _X and the maximum flow rate Q _MAX are compared, and when the maximum flow rate Q _MAX is smaller than the control flow rate Q _X , the small maximum flow rate Q _MAX is set as the control flow rate in step S12, and the control flow rate Q _{MAX When X} is smaller than the maximum flow rate, a small control flow rate Q _X is instructed to the flow rate control valve 23 as it is, and the control flow rate does not exceed the maximum flow rate obtained on the basis of the heat quantity that can be supplied from each water heater. Therefore, overcapacity is prevented.

The flow rate of the hot water supply device according to this control method will be illustrated. In a water heater that operates three water heaters A, B, and C, when the total flow rate is 27 liters per minute, when each flow rate control valve 23 is fully open, each flow rate is 10 minutes per minute due to the pressure loss difference.
Suppose that it is 9 or 8 liters. In the present embodiment, the control flow rate is not 9 liters per minute obtained by simply averaging the total flow rate, but a value obtained by adding 0.2 liters per minute to the average flow rate is 9.2 liters per minute for each water heater. Is calculated as the control flow rate and the flow rate control valve 23 is commanded. In response to this control flow rate, in the water heater A, the flow rate control valve 23 is closed from the fully open state, and the flow rate is controlled to 9.2 liters per minute. As a result, the surplus flow rate of 0.8 liters per minute is distributed to the water heater BC, and in the calculated value, the water heater B is distributed to 9.42 liters per minute and the water heater C is distributed to 8.38 liters per minute. Like the water heater A, the water heater B is controlled so that the control flow rate is 9.2 liters per minute so that the valve is closed from the fully opened state. Therefore, the excess flow rate 0.22 liters per minute is distributed to the water heater C to supply hot water. The flow rate of vessel C is 8.6 liters per minute. With respect to the subsequent increase in the amount of hot water discharged from the hot water currant, the water heater C with the flow control valve 23 fully open does not change the flow rate up to 0.6 liter per minute, which is the flow rate difference up to 9.2 liter per minute. A controlled flow rate can also be used. Then, even if the total flow rate is once increased, the increased amount is increased in the previous step S2.
Since the current flow rate is detected as and the control flow rate is changed, the hot water supply apparatus can always cope with the control flow rate including a predetermined flow rate even if the hot water discharge amount in the hot water currant increases.

[0011]

As described above in detail, according to the present invention, since the control flow rate is always larger than the actual amount of hot water discharged, when the curran opening increases, for example, the curran opening is temporarily decreased. Even when the Karan opening is increased again, the actual hot water discharge amount increases up to the control flow rate before the Karan opening increase, and at the same time, a new control flow rate is calculated from the actual hot water discharge amount after this increase, and the hot water discharge amount is calculated. Always increases to the curran opening or the maximum opening of the flow control valve. Therefore, the flow control valve can evenly distribute the difference in the amount of hot water discharged due to the pressure loss of each hot water supply device, prevent the uneven load of the amount of hot water generated between the hot water supply devices of the conventional hot water supply device, and prevent the unevenness at the installation site. There is no need to adjust the manual adjustment valve. Further, in the second invention, the calculated control flow rate does not exceed the maximum flow rate obtained on the basis of the heat quantity that can be supplied from each water heater when all the water heaters are operated, and therefore the hot water discharge due to the excess capacity It is possible to prevent the temperature from decreasing.

[Brief description of drawings]

FIG. 1 is a schematic view showing a hot water supply device as one embodiment.

FIG. 2 is a flowchart showing the operation of the hot water supply device as one embodiment.

FIG. 3 is a flowchart showing the operation of the hot water supply device as one embodiment.

[Explanation of symbols]

1 ・ ・ Hot water supply device, 2 ・ ・ Hot water supply device, 3 ・ ・ Water supply pipe, 4 ・ ・
Hot water pipe, 5 ・ ・ Unit control device, 6 ・ ・ Remote control, 20 ・
・ Burner controller, 21 ・ ・ Temperature sensor, 22
..Water quantity sensor, 23..Open / close valve, 24 ... Proportional control valve, 25..Flow control valve

Claims (2)

[Claims] 1. In a water heater for connecting a plurality of water heaters in parallel and operating a part or all of the controlled water heaters and discharging hot water, a flow rate obtained by adding a predetermined flow rate to an average flow rate obtained by dividing the total flow rate by the operating number. A water heater that commands the flow rate control valve as the control flow rate of the water heater. 2. When a plurality of water heaters are connected in parallel and all of the water heaters to be controlled are operating and in a hot water discharge state, a value obtained by adding a predetermined flow rate to an average flow rate obtained by dividing the total flow rate by the number of operating units, and A hot water supply device that compares the maximum flow rate obtained based on the amount of heat that can be supplied by the water heater and issues a command to the flow control valve of the water heater as a small value.