JP2021085567A - Hot water storage water heater - Google Patents

Abstract

To provide a hot water storage water heater which can properly control a push-in amount to a hot water storage tank and a discharge amount from the hot water storage tank in heating by an auxiliary heat source machine.SOLUTION: A hot water storage water heater (1) includes a main heat source machine (2) for heating water, an auxiliary heat source machine (5), and a hot water storage tank (3) for storing hot water. The hot water storage water heater is provided with control means (8) for determining, when tapping hot water heated by the auxiliary heat source machine (5), whether to push in a part of the hot water heated by the auxiliary heat source machine (5) based on the hot water temperature at an upper part of the hot water storage tank (3) into the hot water storage tank (3), or to discharge the hot water from the hot water storage tank (3), mix it with the hot water being tapped from the auxiliary heat source machine (5), and tap it, and for pushing in the hot water storage tank (3) when the hot water temperature of the upper part of the hot water storage tank (3) is equal to or less than a first setting value, and discharging the hot water from the hot water storage tank (3) when the hot water temperature of the upper part of the hot water of the hot water storage tank (3) is equal to or higher than a second setting value which is higher than the first setting value.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hot water storage device, and more particularly to a hot water storage device capable of appropriately controlling the amount of hot water pushed into the hot water storage tank and the amount of hot water discharged from the hot water storage tank when the hot water heated by the auxiliary heat source machine is discharged.

The hot water storage device is a main heat source machine, an auxiliary heat source machine that heats clean water, a hot water storage tank that stores hot water, and hot water is taken out from the lower part of the hot water storage tank and returned to the upper part of the hot water storage tank via the main heat source machine. It has a heating circulation circuit. The hot water stored in the hot water storage tank is supplied from the hot water supply passage to the hot water supply passage on the downstream side of the mixing valve through the mixing valve.

When the temperature of the hot water in the hot water storage tank is low or when the bath is reheated, the auxiliary heat source machine is operated and the hot water heated there is discharged. The passage to which the hot water heated by the auxiliary heat source machine is supplied is connected to the hot water supply passage. The flow rate of hot water heated by the auxiliary heat source machine is determined by the rotation speed of the circulation pump in the passage that supplies clean water to the auxiliary heat source machine.

If the rotation speed of the circulation pump is insufficient when heating with the auxiliary heat source machine and the hot water is discharged, the flow rate of the hot water heated by the auxiliary heat source machine is insufficient, so the low temperature hot water in the hot water storage tank is also discharged and the auxiliary heat source machine is used. It is supplied by being mixed with heated hot water. In order to prevent this, normally, the rotation speed of the circulation pump is set to a large value, and a part of the hot water heated by the auxiliary heat source machine is pushed into the hot water storage tank to prevent the temperature of the hot water from dropping.

Patent Document 1 discloses a hot water storage type hot water supply system having a hot water storage mixed hot water supply mode in which hot water heated by an auxiliary heat source machine is mixed with hot water from the hot water storage tank and discharged when the temperature of the hot water stored in the hot water storage tank is low. There is.

Japanese Patent No. 5347654

As described above, when pushing a part of the hot water heated by the auxiliary heat source machine into the hot water storage tank, if there is a passage for the hot water to flow from the hot water storage tank to the auxiliary heat source machine, the excess hot water from the auxiliary heat source machine will be mixed with the water supply. , It is heated again by the auxiliary heat source machine.

However, if there is no passage for flowing hot water from the hot water storage tank to the auxiliary heat source machine, the excess hot water from the auxiliary heat source machine will flow into the hot water storage tank and be stored. If the amount of hot water flowing into the hot water storage tank accumulates, the amount of hot water stored in the hot water storage tank will increase even though it is not heated by the main heat source machine, and it will automatically switch to tank hot water, which will give the user a sense of discomfort. .. Moreover, since the chances of storing hot water by the main heat source machine are reduced, the energy saving performance is also deteriorated.

An object of the present invention is to provide a hot water storage device capable of appropriately controlling the amount of pushing into a hot water storage tank and the amount of discharging from a hot water storage tank when heating with an auxiliary heat source machine.

The hot water storage device according to claim 1 is a hot water storage device including a main heat source machine for heating water, an auxiliary heat source machine, and a hot water storage tank for storing hot water, and hot water is discharged from a water supply passage and a hot water storage tank for supplying water to the hot water storage tank. It is provided with a hot water outlet, and the auxiliary heat source machine is provided on the auxiliary heating passage branched from the water supply passage and connected to the hot water passage, and when the hot water heated by the auxiliary heat source machine is discharged, the hot water storage tank Control to determine whether to push a part of the hot water heated by the auxiliary heat source machine into the hot water storage tank based on the hot water temperature of the upper part, or to discharge the hot water from the hot water storage tank and mix it with the hot water discharged from the auxiliary heat source machine to discharge the hot water. As a means, when the hot water temperature at the top of the hot water storage tank is lower than the first set value, it is pushed into the hot water storage tank, and when the hot water temperature at the upper part of the hot water storage tank is higher than the first set value, it is higher than the second set value. It is characterized by providing a control means for discharging hot water from the hot water storage tank.

According to the above configuration, when the hot water temperature at the top of the hot water storage tank is equal to or lower than the first set value (for example, hot water supply set temperature + 3 °), a part of the hot water heated by the auxiliary heat source machine is pushed into the hot water storage tank. It is possible to prevent the temperature of the hot water from dropping due to the hot water from the tank.
Further, when the hot water temperature at the upper part of the hot water storage tank is higher than the second set value (for example, hot water supply set temperature + 10 °) higher than the first set value, hot water is discharged from the hot water storage tank, so that the amount of hot water stored in the hot water storage tank is increased. It does not increase and switch to tank hot water, and does not give the user a sense of discomfort. Moreover, since the opportunity for hot water storage by the main heat source unit is not reduced, it is possible to prevent deterioration of energy saving performance.

In the invention of claim 1, the hot water storage device of claim 2 has a circulation pump interposed in the auxiliary heating passage, and the control means is a change between pushing into the hot water storage tank and discharging from the hot water storage tank. Is performed by changing the rotation speed of the circulation pump. When the hot water is pushed into the hot water storage tank, the rotation speed is gradually increased, and when the hot water is discharged from the hot water storage tank, the rotation speed is gradually decreased. It is a feature.

According to the above configuration, when the hot water is pushed into the hot water storage tank, the rotation speed is gradually increased, and when the hot water is discharged from the hot water storage tank, the rotation speed is gradually decreased. It is possible to avoid affecting the hot water temperature and not give the user a sense of discomfort.

The hot water storage hot water supply device according to claim 3 is a hot water storage hot water supply device provided with a main heat source machine for heating water, an auxiliary heat source machine, and a hot water storage tank for storing hot water, and when hot water heated by the auxiliary heat source machine is discharged. In addition, a part of the hot water heated by the auxiliary heat source machine is pushed into the hot water storage tank based on the hot water temperature at the upper part of the hot water storage tank, or the hot water is discharged from the hot water storage tank and mixed with the hot water discharged from the auxiliary heat source machine. It is a control means for determining whether or not to use the hot water storage tank, and when the hot water temperature at the top of the hot water storage tank is equal to or lower than the third set value, it is pushed into the hot water storage tank, and a fourth set value higher than the third set value is placed on the upper part of the hot water storage tank. When hot water of the above temperature is stored, it is characterized by providing a control means for discharging hot water from the hot water storage tank.

According to the above configuration, when the hot water temperature at the top of the hot water storage tank is equal to or lower than the third set value (for example, the hot water supply set temperature + 3 °), a part of the hot water heated by the auxiliary heat source machine is pushed into the hot water storage tank. When hot water with a temperature higher than the third set value (for example, hot water supply set temperature + 10 °) is stored in the upper part of the hot water, it is pushed into the hot water storage tank in order to discharge the hot water from the hot water storage tank. Since the amount and the amount of water discharged from the hot water storage tank are appropriately controlled, the amount of hot water stored in the hot water storage tank does not increase and the hot water is not switched to the hot water in the tank, which does not give the user a sense of discomfort. Moreover, since the opportunity for hot water storage by the main heat source unit is not reduced, it is possible to prevent deterioration of energy saving performance.

As described above, the present invention exerts various effects.

It is a block diagram of the hot water storage hot water supply apparatus which concerns on embodiment of this invention. It is a part of the flowchart of the circulation pump rotation speed control. It is the rest of the flowchart of the circulation pump rotation speed control. It is a flowchart of interrupt processing included in the said circulation pump rotation speed control. This is a part of the flowchart of the circulation pump rotation speed control according to the modified embodiment. It is the rest of the flowchart of the circulation pump rotation speed control according to the modified embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
First, the hot water storage and hot water supply device 1 will be described with reference to FIG.
In this hot water storage device 1, water is heated by a heat pump unit 2 (main heat source machine) and stored in a hot water storage tank 3, and can be supplied from the hot water storage tank 3 to a curan 4 or a bath (not shown). The hot water taken out from the hot water storage tank 3 can be heated by the auxiliary heat source machine 5 and supplied to the bath heat exchanger 6 outside the curan 4 and the bath.

The hot water storage device 1 includes a hot water storage tank 3 covered with a heat insulating material, a heat pump unit 2, a gas combustion type auxiliary heat source machine 5, a neutralizer 5a, a control unit 8, and an operation remote control 9 connected to the control unit 8. As various flow path systems including piping and equipment, the water supply system A, the heating circulation system B, the hot water supply system C for supplying hot water to the curan 4, the hot water supply system D for pouring hot water into the bath, and the heat exchanger 6 for the bath It has a heat utilization system E that supplies hot water. The heat utilization system E is additionally provided with a reheating system G for reheating bath water. The hot water storage tank 3 is provided with five thermistors 3a to 3e for detecting the hot water temperature of a plurality of temperature stratifications extending from the bottom to the top.

Next, each of the above systems will be described. However, only the main equipment will be described, and the thermistor, the drain plug, etc., which are not directly related to the present application, will be omitted.
The water supply system A includes a water supply main plug (not shown), a passage 12 provided with a pressure reducing valve 11, a passage 13 connected to the passage 12, a check valve 14 provided in the passage 13, and a passage connecting the passage 13 to the hot water storage tank 3. Has 15. A drainage passage 16 is connected to the passage 15, and a drain valve 17 is provided at the downstream end of the drain passage 16.

The heating circulation system B includes an outgoing passage 18 extending from the bottom of the hot water storage tank 3 to the heat pump unit 2, a heat pump unit 2, a return passage 19 extending from the heat pump unit 2 to the top of the hot water storage tank 3, and a hot water storage provided in the outgoing passage 18. It has a pump 21, a bypass passage 20 that connects the forward passage 18 and the return passage 19, a hot water storage switching valve 22 (three-way electromagnetic valve) provided at a connection portion between the return passage 19 and the bypass passage 20, and the like.

The hot water supply system C includes a passage 25 extending from the top of the hot water storage tank 3, a passage 26 connected to the passage 25, a passage 27 connected to the passage 26, and a mixing valve provided at the connection portion of the passages 25 and 26. It has 28, a hot water supply water amount sensor 29 provided in the passage 26, a water amount adjusting valve 30 provided at a connection portion of the passages 26 and 27, and the like. A passage 31 extending from the passage 12 is connected to the mixing valve 28, and a check valve 32 is provided in the passage 31. A high temperature avoidance solenoid valve 34 is provided in the bypass passage 33 connecting the passages 26 and 31.

A thermistor 7 projecting into the passage 25 is attached to a portion near the upstream end of the passage 25 (near the top of the hot water storage tank 3), and a thermistor 23 is attached to the upstream side of the passage 25 from the mixing valve 28. A thermistor 24 is attached to the hot water supply water amount sensor 29.

The pouring system D includes a passage 35 branched from the water amount adjusting valve 30, a passage 36 extending from the passage 35 to a bathtub (not shown), a pouring electromagnetic valve 37 provided in the passage 35, and a pouring water amount sensor 38. It has a bath thermistor 40 and the like provided in the passage 36. A backflow prevention valve 42 is connected to the downstream end of the passage 41 that branches from the passage 12 and extends to the pouring solenoid valve 37, and this backflow prevention valve 42 is connected to the pouring solenoid valve 37, from the backflow prevention valve 42 to the hopper 43. An extending overflow passage 44 is also provided.

The heat utilization system E includes a circulation pump 46, a passage 48 extending from the circulation pump 46 to the auxiliary heat source machine 5 and connected to an internal heat exchanger, a gas combustion type auxiliary heat source machine 5, and the auxiliary heat source machine. A passage 49 extending from the heat exchanger in 5, a passage 51 extending from the passage 49, passing through the bath heat exchanger 6 and extending downward, and a passage 52 extending from the downstream end of the passage 51 to the circulation pump 46. It has a bath heat exchange outlet electromagnetic valve 54 and the like provided at the connection portion of the passages 51 and 52. A circulating water amount sensor 45 is provided in the passage 48.

A gas passage 5b for introducing fuel gas into the auxiliary heat source machine 5 and a neutralizer 5a connected to the auxiliary heat source machine 5 via a drain passage 5c are also provided.

Further, a bypass passage 49a connecting the passages 49 and 25 and a tank water proportional valve 55 provided in the bypass passage 49a are also provided. A hot water storage outlet thermistor 56 is provided in the connecting passage 15a connecting the passages 15 and 52. A relief valve 59 is provided in the overflow passage 57 that connects the connection passage 15a to the hopper 43.
The passage 15a, the portion of the passage 52 downstream of the passage 15a, and the passages 48, 49, 49a correspond to the "auxiliary heating passage".

The reheating system G includes a passage 75 extending from the upstream end of the passage 36 to the bath heat exchanger 6, a passage 76 extending from the bath heat exchanger 6 to the bathtub, and a bath pump 77 and a bath interposed in the passage 75. It has a water flow switch 78, a water level sensor 39, and the like.
Here, the devices (pumps, valves, etc.) to be controlled provided in the plurality of flow path systems are controlled by the control unit 8, and the detection signals of the sensors are supplied to the control unit 8.

Here, the present application is characterized by controlling the rotation speed of the circulation pump for adjusting the amount of hot water discharged from the auxiliary heat source machine 5. Hereinafter, the above-mentioned circulation pump rotation speed control will be described based on the flowcharts of FIGS. 2 to 4. The flowchart for controlling the rotation speed of the circulation pump is stored in the control unit 8 in advance. In FIGS. 2 to 4, Si (i = 1, 2, ...) Indicates each step.

First, the flow chart of the interrupt processing of FIG. 4 will be described.
This interrupt process is an interval interrupt executed every predetermined time (for example, 200 ms). First, in S20, the detected temperatures of the thermistors 12, 23, and 24 are read and stored in the memory, and the detected flow rate of the hot water supply water amount sensor 29 is read and stored in the memory.

Next, the flow rate Q1 flowing through the passage 25 is calculated in S21.
That is, the mixing ratio of the hot water flowing through the passage 25 and the clean water supplied from the passage 31 is calculated from the detected temperature of the thermistor 23, the detected temperature of the thermistor 12, and the detected temperature of the thermistor 24, and then the detected flow rate of the hot water supply water amount sensor 29. And the flow rate Q1 flowing through the passage 25 is calculated from the mixing ratio.

Next, in S22, the detected flow rate Q2 of the circulating water amount sensor 45 (this is the flow rate of hot water heated by the auxiliary heat source machine 5) is read, and in the next S23, the flow rate difference ΔQ = (Q2-Q1) is calculated. Will be done.
Here, when ΔQ is 0, all of the hot water heated by the auxiliary heat source machine 5 is discharged to the passage 25.
When ΔQ is larger than 0, a part of the hot water heated by the auxiliary heat source machine 5 is pushed into the hot water storage tank 3, and when ΔQ is smaller than 0, the hot water heated by the auxiliary heat source machine 5 is put into the hot water storage tank 3 from the hot water storage tank 3. The discharged hot water is mixed and discharged to the passage 25.

Next, the circulation pump rotation speed control will be described with reference to FIGS. 2 and 3.
First, in S1, it is determined from the auxiliary heat source machine 3 whether or not hot water is being discharged. This determination can be made, for example, by whether or not the detected flow rate of the circulating water amount sensor 45 is correct.
When the determination in S1 is Yes, the detection temperature Th of the thermistor 7 and the flow rate difference ΔQ calculated in the interrupt process are read in S2.

Next, in S3, it is determined whether or not Th ≦ (Ts + α). Note that Ts is the hot water supply set temperature (for example, 40 °), and the predetermined value α is, for example, 3 °. This (Ts + α) corresponds to the first set value. When the determination in S3 is Yes, it is determined in S4 whether or not the flow rate difference ΔQ is ΔQ ≦ a (for example, a is 500 cc / min).
However, although not shown, if ΔQ is negative, the rotation speed of the circulation pump 46 is increased based on the detected flow rate of the circulating water amount sensor 45 and the flow rate Q1 flowing through the passage 25 so that ΔQ becomes a value close to a. It will be adjusted.

When the determination of S4 is No, the rotation speed of the circulation pump 46 is lowered by a predetermined value b (for example, b is 200 rpm) in S5, then the process returns to S4, and S4 and S5 are repeated to make the determination of S4 Yes. , S6 to S9 are executed in order to gradually increase the amount of hot water to be pushed into the hot water storage tank 3.

In S6, the rotation speed of the circulation pump 46 is increased by a predetermined value c (for example, c is 100 rpm), then in S7, the timer T1 is reset and then started, and then in S8, the rotation speed of the circulation pump 46 is increased. It is determined whether or not the predetermined value K1 (for example, K1 is 3000 rpm) or more is determined, and if the determination is No, whether or not the time counting time T1 of the timer T1 is the predetermined time d (for example, 1 second) or more in S9. If the judgment is Yes, the process returns to S6, and S6 and subsequent steps are repeated. If the judgment of S9 is No, S9 is repeated. After that, when the determination in S8 is Yes, the control for increasing the amount of pushing into the hot water storage tank 3 is stopped and the product returns.

In this way, the amount of hot water pushed into the hot water storage tank 3 is gradually increased, and an appropriate amount of hot water (for example, the amount from the top of the hot water storage tank 3 to the level of the thermistor 3e) can be stored in the hot water storage tank 3. Instead of the determination in S8, the return may be performed on the condition that the detection temperature of the thermistor 3e becomes, for example, (Ts + α) or higher.

As described above, by gradually increasing the amount of hot water pushed into the hot water storage tank 3, the rate of increase in the amount of hot water in the hot water storage tank 3 is suppressed, and excessive hot water is prevented from accumulating in the hot water storage tank 3. Can be done.

On the other hand, if the determination in S3 is No, the process proceeds to S10 in FIG. 3, it is determined in S10 whether or not the detection temperature Th of the thermistor 7 is (Ts + β) or higher, and if the determination is Yes, the process proceeds to S11. The predetermined value β is, for example, 10 °. The above (Ts + β) corresponds to the second set value. If the determination in S10 is No, a return is made. As described above, the reason why the space between α of S3 and β of S10 is several degrees is to improve the stability of control by providing hysteresis.

Next, in S11, it is determined whether or not −ΔQ = (Q1-Q2) ≦ e, which is the discharge flow rate from the hot water storage tank 3. The predetermined value e is, for example, 500 cc / min.
When the determination in S11 is No, in S12, the rotation speed of the circulation pump 46 is increased by a predetermined value f (for example, f is 200 rpm) to increase Q2 and decrease −ΔQ, and then return from S12 to S11. When −ΔQ ≦ e (the discharge flow rate from the hot water storage tank 3 becomes equal to or less than a predetermined value), S13 to S16 are executed in order to gradually increase the discharge flow rate from the hot water storage tank 3.

In S13, the rotation speed of the circulation pump 46 is lowered by a predetermined value g (for example, g is 100 rpm), then in S14, the timer T2 is started after being reset, and then in S15, the rotation speed of the circulation pump 46 is a predetermined value. It is determined whether or not the value is K2 (for example, K2 is 500 rpm) or less, and if the determination is No, the process proceeds to S16.

In S16, it is determined whether or not the time counting time T2 of the timer T2 is equal to or longer than the predetermined time h (for example, h is 1 second), S16 is repeated while the determination is No, and when the determination of S16 is Yes, the process returns to S13. And repeat after S13. After that, when the determination in S15 is Yes, the control for increasing the amount of discharge from the hot water storage tank 3 is terminated and the product returns.

In this way, by gradually increasing the discharge flow rate (−ΔQ) from the hot water storage tank 3 step by step, it is possible to prevent the hot water temperature from being affected, and the stability of control can be ensured. ..

The action and effect of the circulation pump rotation speed control described above will be described.
When the hot water temperature at the top of the hot water storage tank 3 is equal to or lower than the first set value (for example, the hot water supply set temperature Ts + 3 °), a part of the hot water heated by the auxiliary heat source machine 5 is pushed into the hot water storage tank 3, so that the hot water storage tank 3 is used. It is possible to prevent the temperature of the hot water from dropping due to the hot water.

Further, when the hot water temperature at the upper part of the hot water storage tank 3 is higher than the second set value (for example, the hot water supply set temperature Ts + 10 °) higher than the first set value, hot water is discharged from the hot water storage tank 3, so that the hot water storage tank 3 is used. The amount of hot water stored does not increase and the hot water is not switched to tank hot water, which does not give the user a sense of discomfort. Moreover, since the opportunity for hot water storage by the heat pump unit 2 is not reduced, it is possible to prevent the energy saving property from deteriorating.

When pushing into the hot water storage tank 3, the amount of hot water to be pushed in is gradually increased to suppress the rate of increase in the amount of hot water in the hot water storage tank 3 and prevent the hot water from accumulating too much in the hot water storage tank 3. Can be done. Then, when discharging from the hot water storage tank 3, the discharge flow rate (−ΔQ) can be gradually increased in stages so as not to affect the hot water temperature, and the stability of control can be ensured. it can.

In this way, even if there is no passage for flowing hot water from the hot water storage tank 3 to the auxiliary heat source machine 5, by adjusting the flow rate of the hot water flowing in and out of the hot water storage tank 3, the hot water discharge temperature is lowered and the hot water storage tank 3 is excessively stored. Can be prevented.

It should be noted that the numerical values shown as examples in the various predetermined values a to h are examples and are not limited to these numerical values.

Modified embodiment

Next, the circulation pump rotation speed control according to the modified embodiment will be described with reference to FIGS. 5 and 6. When this control is started, in S30, it is determined whether or not hot water is being discharged from the auxiliary heat source machine 3. This determination can be made, for example, by whether or not the detected flow rate of the circulating water amount sensor 45 is correct. When the determination in S30 is Yes, the detection temperature Th1 of the thermistor 7 and the detection temperature Th2 of the thermistor 3e are read in S31.

Next, in S32, it is determined whether or not Th1 ≦ (Ts + i). Note that Ts is the hot water supply set temperature (for example, 40 °), the predetermined value i is, for example, 3 °, and (Ts + i) corresponds to the third set value. When the determination of S32 is No, the process proceeds to S37, and when the determination of S32 is Yes, the rotation speed of the circulation pump 46 is increased by a predetermined value j in S33. The predetermined value j is, for example, 100 rpm.

Next, in S34, the timer T3 is started after being reset, and in the next S35, it is determined whether or not the rotation speed of the circulation pump 46 is equal to or higher than a predetermined value K3 (K3 is, for example, 3000 rpm). After shifting to S36, it is determined whether or not the time counting time T3 of the timer T3 is equal to or greater than a predetermined value k (for example, k is 1 second). If the determination is No, S36 is repeated, and if the determination of S36 becomes Yes, S33. Return to, and S33 and subsequent steps are repeated.
After that, when the determination in S35 is Yes, the control of pushing hot water into the hot water storage tank 3 is stopped and the product returns.

In this way, by gradually increasing the amount of hot water pushed into the hot water storage tank 3, the rate of increase in the amount of hot water in the hot water storage tank 3 is suppressed, and hot water is discharged from the hot water storage tank 3 while the heat pump unit 2 is stopped. It is possible to prevent the user from feeling uncomfortable by switching to (tank hot water).

When the determination in S32 is No, the process proceeds to S37 in FIG.
In S37, it is determined whether or not the detection temperature Th2 of the thermistor 3e is (Ts + m) or higher.
Ts is the hot water supply set temperature (for example, 40 °), the predetermined value m is, for example, 10 °, and (Ts + m) corresponds to the fourth set value.
The reason why the predetermined value i of S32 and the predetermined value m of S37 are separated by several degrees is to provide hysteresis and stabilize the control. When the determination of S37 is No, the process returns, and when the determination of S37 is Yes, the process proceeds to S38.

When the determination of S37 is Yes, hot water having a temperature higher than (Ts + i) and higher than (Ts + m) is stored in the upper part of the hot water storage tank 3 (for example, from the top to the level of the thermistor 3e). S38 to S41 are executed in order to gradually and gradually increase the flow rate of the hot water discharged from the hot water storage tank 3.
In S38, the rotation speed of the circulation pump 46 is lowered by a predetermined value n (for example, n is 100 rpm), and then in S39, the timer T4 is started after being reset.

In S40, it is determined whether or not the rotation speed of the circulation pump 46 is equal to or less than a predetermined value K4 (for example, K4 is, for example, 400 rpm). When the determination of S40 is No, it is determined in S41 whether or not the time counting time T4 of the timer T4 exceeds a predetermined value p (for example, p is 1 second). When the determination is Yes, the process returns to S38 and S38 and subsequent steps are repeated. After that, when the determination in S40 is Yes, the control for increasing the flow rate discharged from the hot water storage tank 3 is terminated and the product returns.

In this way, by gradually increasing the discharge flow rate (−ΔQ) from the hot water storage tank 3 step by step, it is possible to prevent the hot water temperature from being affected, and the stability of control can be ensured. ..

The action and effect of the circulation pump rotation speed control described above will be described.
When the hot water temperature at the top of the hot water storage tank 3 is less than or equal to the third set value (for example, the hot water supply set temperature Ts + 3 °), a part of the hot water heated by the auxiliary heat source machine is pushed into the hot water storage tank, and the third set above the hot water storage tank. When hot water with a temperature higher than the set value of the 4th set value (for example, hot water supply set temperature Ts + 10 °) is stored, the hot water is discharged from the hot water storage tank. Since the amount of hot water discharged from the hot water is appropriately controlled, it is possible to prevent the hot water temperature from dropping due to the hot water discharged from the hot water storage tank 3.

Then, the amount of hot water stored in the hot water storage tank does not increase and the hot water is not switched to the hot water in the tank, which does not give the user a sense of discomfort. Moreover, since the opportunity for hot water storage by the heat pump unit 2 is not reduced, it is possible to prevent the energy saving property from deteriorating.

When pushing into the hot water storage tank 3, the amount of hot water to be pushed is gradually increased to suppress the rate of increase in the amount of hot water in the hot water storage tank 3 and prevent the hot water from accumulating too much in the hot water storage tank 3. Can be done.
Further, when discharging from the hot water storage tank 3, the discharge flow rate (−ΔQ) can be gradually increased in a stepwise manner so as not to affect the hot water temperature, and the stability of control can be ensured. Can be done.
The numerical values shown in the examples for various predetermined values i, j, k, m, n, and p are examples and are not limited to these numerical values.

Next, an example of partially modifying the above embodiment will be described.
1) The hot water storage and hot water supply device 1 may be provided with a heat source machine for heating and a passage or the like associated therewith.
2) The hot water storage and hot water supply device 1 shows an example of the hot water storage and hot water supply device, and the present invention can be applied to various hot water storage and hot water supply devices. For example, a fuel cell unit or a gas engine may be provided instead of the heat pump unit 2.

3) In addition, a person skilled in the art can carry out the embodiment in a form in which various modifications are added to the above embodiment without deviating from the gist of the present invention, and the present invention also includes such modified forms. Is.

1 Hot water storage and hot water supply device 2 Heat pump unit (main heat source machine)
3 Hot water storage tank 3e, 7, 12, 23, 24 Thermistor 5 Auxiliary heat source machine 8 Control unit (control means)
9 Operation remote controller 46 Circulation pump (Ts + α) 1st set value (Ts + β) 2nd set value (Ts + i) 3rd set value (Ts + m) 4th set value

Claims (3)

A hot water storage device equipped with a main heat source machine for heating water, an auxiliary heat source machine, and a hot water storage tank for storing hot water, and an auxiliary heat source machine equipped with a water supply passage for supplying water to the hot water storage tank and a hot water discharge passage for discharging hot water from the hot water storage tank. Is provided on the auxiliary heating passage that is branched from the water supply passage and connected to the hot water passage.
When the hot water heated by the auxiliary heat source machine is discharged, a part of the hot water heated by the auxiliary heat source machine is pushed into the hot water storage tank based on the hot water temperature at the upper part of the hot water storage tank, or the hot water is discharged from the hot water storage tank. It is a control means for determining whether or not hot water is mixed with hot water discharged from an auxiliary heat source machine.
When the hot water temperature at the top of the hot water storage tank is below the first set value, push it into the hot water storage tank, and when the hot water temperature at the top of the hot water storage tank is higher than the first set value and above the second set value, hot water is discharged from the hot water storage tank. A hot water storage and hot water supply device characterized by being provided with a control means for discharging. A circulation pump is installed in the auxiliary heating passage.
The control means changes between pushing into the hot water storage tank and discharging from the hot water storage tank by changing the rotation speed of the circulation pump, and when pushing hot water into the hot water storage tank, the rotation speed is gradually increased. The hot water storage hot water supply device according to claim 1, wherein the number of rotations is gradually reduced when hot water is discharged from the hot water storage tank. In a hot water storage device equipped with a main heat source machine that heats water, an auxiliary heat source machine, and a hot water storage tank that stores hot water.
When the hot water heated by the auxiliary heat source machine is discharged, a part of the hot water heated by the auxiliary heat source machine is pushed into the hot water storage tank based on the hot water temperature at the upper part of the hot water storage tank, or the hot water is discharged from the hot water storage tank. It is a control means for determining whether or not hot water is mixed with hot water discharged from an auxiliary heat source machine.
When the hot water temperature at the top of the hot water storage tank is equal to or lower than the third set value, it is pushed into the hot water storage tank, and when hot water having a temperature higher than the third set value or higher than the third set value is stored in the upper part of the hot water storage tank. Is a hot water storage and hot water supply device characterized by being provided with a control means for discharging hot water from the hot water storage tank.

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