JP3920088B2 - Hot water storage hot water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water storage type hot water supply and heating device that uses hot water in a hot water storage tank that stores hot water for hot water supply and circulates the hot water as a heating heat source.
[0002]
[Prior art]
Conventionally, in this type of hot water storage hot water heater, as disclosed in, for example, Japanese Patent No. 2666337, a hot water storage tank for storing hot water, a heating terminal installed in a bathroom, etc., and hot water in a hot water storage tank are provided. It has a heating circulation pump that circulates to the heating terminal, and when heating start is instructed, the heating circulation pump is driven to heat the hot water in the hot water storage tank to the heating terminal for heating.
[0003]
In this conventional system, when heating is not used for a long period of time such as summer, the hot water remaining in the heating terminal deteriorates, and when heating is started at a time when heating is required again, Since the deteriorated water in the heating terminal is mixed into the hot water storage tank as the pump is driven, there is a serious problem in terms of hygiene. For example, as disclosed in (1) JP 2000-179872 A There has been one in which the water in the heating terminal is replaced by driving the heating circulation pump every 24 hours for 2 minutes regardless of whether the heating operation is performed or not.
[0004]
As a similar technique, for example, as described in (2) JP-A-9-60892, in order to prevent the heating circulation pump from sticking, the heating circulation pump is driven for about 10 seconds every 24 hours after the heating circulation pump is stopped. There was something to do.
[0005]
[Problems to be solved by the invention]
However, in the conventional system of the above (1), since the heating circulation pump is driven regardless of whether or not the heating operation is performed, the heating circulation pump is driven only a few minutes ago. The heating circulation pump is driven again to replace the hot water, so it consumes no power at all.Also, although the user should have stopped the heating operation, the sound of driving the heating circulation pump is heard and the equipment is abnormal. There was a risk of misunderstanding that it occurred.
[0006]
Further, in the conventional system of (2), since the heating circulation pump is driven every 24 hours after the heating circulation pump is stopped, the time when the heating operation is performed or not performed depending on the day is in the morning or at night. The heating circulation pump is driven at various times depending on the day, and there is a possibility that the user may mistakenly think that an abnormality has occurred in the device.
[0007]
Therefore, the present invention solves the above-described problems of the conventional example at the same time, and reliably replaces the accumulated water in the heating terminal without driving the useless heating circulation pump, thereby improving the sanitary safety of the hot water in the hot water storage tank. The purpose is to ensure it securely and to eliminate the possibility that the user will misunderstand that an abnormality has occurred in the device.
[0008]
[Means for Solving the Problems]
Accordingly, in order to solve the above problems, in claim 1 of the present invention, a hot water storage tank for storing hot water, a heating device for heating the hot water in the hot water storage tank, and the hot water in the hot water storage tank are circulated to the heating device. A heating circulation circuit having a heating circulation pump , a hot water supply circuit for supplying hot water in the hot water storage tank, a heating circulation circuit connected to the hot water storage tank, and hot water in the hot water storage tank to the heating circulation circuit A heating circulation pump that circulates , calculates a boiling start time at which boiling can be completed by the set time of the next day, and the heating device supplies hot water in the hot water storage tank at a boiling start time within a predetermined time zone . in the hot-water storage type hot water heating apparatus which performs hot water storage operation is heated to hot-water storage, heating circulation pump a predetermined time before the reference time of the boiling start time is driven for a predetermined time or more Driven forcibly heater circulation pump if not have replaced the accumulated water in the heater circulation circuit, and to perform hot water storage operation by driving the subsequent becomes boiling start time and a heating device and the heating circulation pump.
[0009]
Thus, at the time a predetermined time before the reference time of boiling start time of midnight, it is determined whether the heater circulation pump within the past predetermined time has been driven, the wasteful heating circulation pump if the driven If it is not driven, the heating circulation pump can be driven to replace the staying water in the heating circulation circuit, and the staying water in the heating circulation circuit can be replaced reliably to sanitize hot water in the hot water storage tank. The safety circulation is ensured, and the heating circulation pump is driven at the reference time before the boiling start time in the midnight time zone , so the user misunderstands that the device has malfunctioned In addition, the hot water in the heating circulation circuit is replaced before the hot water storage operation. Than replace the water heat radiation loss becomes small with becomes energy saving, without disturbs the thermal stratification is formed in the hot water storage tank by the hot water storage operation, it can be reduced heat radiation loss in the hot water storage tank.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, a hot water storage type hot water supply and heating apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
1 is a hot water storage tank unit, 2 is a heating unit that heats water as a heating device, 3 is a heating unit, and 4 is a heating terminal such as a bath room temperature water heater, which performs hot water supply and heating.
[0013]
The hot water storage tank unit 1 has a hot water storage tank 7 having a water supply pipe 5 connected to the lower part and a hot water discharge pipe 6 connected to the upper part. A hot water supply pipe 8 is connected to a faucet (not shown). Cold water passing through the bypass pipe 9 branched from the water supply pipe 5 and hot hot water from the hot water discharge pipe 6 are adjusted to an appropriate temperature by the mixing valve 10. Hot water. These constitute a hot water supply circuit.
[0014]
The hot water storage tank 7 is provided with a plurality of hot water storage temperature sensors 11 for detecting the amount of stored hot water in the vertical direction of the tank, and hot water is stored up to the position where the temperature sensor is provided by detecting a temperature above a predetermined temperature. Can be detected. Reference numeral 12 denotes a relief valve for releasing the overpressure of the hot water storage tank 7. The hot water storage tank unit 1 and the heating unit 2 are connected so as to be circulated by a heating circulation circuit 13, and hot water from the lower part of the hot water storage tank 7 is heated by the heating unit 2 and returned to the upper part of the hot water storage tank 7. Are stacked in order from the top to store hot water.
[0015]
A hot water storage control unit 14 has a microcomputer connected to a hot water remote controller 15 and controls the sensors and actuators in the hot water tank unit 1. Here, boiling of the hot water in the hot water storage tank unit 1 is performed mainly by cheap late-night power at midnight, and the boiling control unit 16 of the hot water storage control unit 14 uses the amount of heat used for several days to use heat for the next day. The time is calculated backward so that the estimated amount of heat is boiled in the morning of the next day, and the heating by the heating unit 2 is started.
[0016]
Next, the heating unit 2 includes a heat pump circuit 21 including a compressor 17, a refrigerant-water heat exchanger 18, an expansion valve 19, and an evaporator 20, and cold water or hot water in the hot water storage tank 7 through a heating circulation circuit 13. A heating circulation pump 22 for sending the heated hot water to the refrigerant-water heat exchanger 18 and returning the heated hot water to the hot water storage tank 7 is provided.
[0017]
Reference numeral 23 denotes a heating control unit having a microcomputer for controlling the heating unit 2, so that the high-temperature hot water exiting the refrigerant-water heat exchanger 18 becomes a predetermined high temperature according to an instruction from the hot water storage control unit 14. Any one of the number of rotations of the heating circulation pump 22, the driving frequency of the compressor 17, and the opening degree of the expansion valve 19 is appropriately adjusted. The heating control unit 23 is connected to the hot water storage control unit 14 in a communicable manner.
[0018]
When the faucet is opened, city water flows into the lower part of the hot water storage tank 7 and hot water at the upper part is pushed out to the hot water discharge pipe 7 to supply hot water. When hot water and city water are switched by the hot water supply operation and the temperature detected by the temperature sensor 11 decreases and the amount of hot water stored in the hot water storage tank 7 falls below a predetermined amount, the heat pump circuit 21 and the heating circulation pump 22 are driven to raise again. Like to do.
[0019]
Next, the heating unit 3 performs water exchange between the hot water in the primary side heating circulation circuit 24 communicating with the upper part and the lower part of the hot water storage tank 7 and the hot water in the secondary side heating circulation circuit 25 communicated with the heating terminal 4- A primary side heating driven by a water heat exchanger 26 and a DC motor having a variable rotation speed that is provided on the primary side and circulates so that hot water in the hot water storage tank 7 is taken out from the high temperature upper part and returned to the low temperature lower part after heat exchange. A circulation pump 27, a secondary side heating circulation pump 28 that is provided on the secondary side and circulates the hot water of the heating terminal 4 and is driven by an AC motor, and the water-water heat exchanger 26 of the secondary side heating circulation circuit 24 This is composed of a hot water temperature sensor 29 for detecting the temperature going to the heating terminal 4 provided on the downstream side and an expansion tank 30 for absorbing the thermal expansion of the secondary side heating circulation circuit 25.
[0020]
Reference numeral 31 denotes a heating control unit having a microcomputer for controlling the heating unit 3, which is connected to the hot water storage control unit 14 so as to be communicable in a wired manner. The circulation pump 27 and the secondary side heating circulation pump 28 are driven, and the rotational speed of the primary side heating circulation pump 27 is adjusted so that the temperature detected by the hot water temperature sensor 29 becomes a predetermined temperature.
[0021]
The heating control unit 31 has a drive presence / absence determination unit 33 that determines whether or not the primary side heating circulation pump 27 has been driven within the past 24 hours. Counting is started from the stop of driving, and it is determined whether or not the primary side heating circulation pump 27 is driven within the past 24 hours depending on whether or not 24 hours have passed at the time of determining whether or not driving.
[0022]
When there is a request for heating operation, the primary side heating circulation pump 27 is driven to circulate hot water having a high temperature from the upper part of the hot water storage tank 7 to the water-water heat exchanger 26. In the water-water heat exchanger 26, the secondary-side hot water flowing into the water-water heat exchanger 26 by the driving of the secondary-side heating circulation pump 28 is heated by exchanging heat with the high-temperature water on the primary side, and heated on the secondary side. The primary-side hot water whose temperature has decreased due to heat exchange is returned to the lower part of the hot water storage tank 7.
[0023]
Here, the hot water in the hot water storage tank 7 is used as a heating heat source. However, if the heating operation is not performed for a long time, the hot water staying in the water-water heat exchanger 26 and the primary side heating circulation circuit 24 deteriorates. Therefore, the heating control unit 31 drives the primary side heating circulation pump 27 every predetermined time such as 24 hours, and stays in the water-water heat exchanger 26 and the primary side heating circulation circuit 24. It is necessary to prevent the hot water from deteriorating by forcibly circulating the hot water.
[0024]
Therefore, in the present invention, the forced heating of the primary side heating circulation pump 27 when heating is not used is performed on the condition that the primary side heating circulation pump 27 has not been driven within the past 24 hours. This is done just before boiling operation.
[0025]
Next, the characteristic operation of the present invention will be described based on the flowcharts of FIGS.
First, the boiling control unit 16 of the hot water supply control unit 13 calculates the maximum amount of heat used for the past seven days from the amount of stored hot water detected by the hot water storage temperature sensor 11 and the stored hot water temperature (step 1, hereinafter abbreviated as S1). Based on the heat quantity, the boiling target heat quantity for the next day is calculated (S2).
[0026]
Then, the remaining amount of heat in the hot water storage tank 7 is calculated (S3), the amount of heat to be heated up to the next day by subtracting from the boiling target heat amount is calculated until the set time of the next day (for example, 6:00 am). The boiling start time at which boiling can be completed is calculated (S4). Then, it is determined whether or not the current time has reached a certain time before the boiling start time (for example, 30 minutes before) (S5), and if not, S1 to S5 are repeated.
[0027]
When it is determined in S5 that the boiling start time has been reached 30 minutes before, the hot water storage control unit 14 sends a reference time signal to the heating control unit 31, and the heating control unit 31 that has received the reference time signal has received the past 24. The drive presence / absence determination unit 33 determines whether or not the primary side heating circulation pump 27 has been driven within the time (S6). This determination method will be described in detail later.
[0028]
Then, when the primary side heating circulation pump 27 has not been driven within the past 24 hours in S6, the heating control unit 31 drives the primary side heating circulation pump 27 for a certain period of time (for example, 5 minutes). All the accumulated water in the side heating circulation circuit 24 is replaced with a part of the warm water in the hot water storage tank 7 to prevent the accumulated water from deteriorating (S7). If the primary-side heating circulation pump 27 has been driven within the past 24 hours, the accumulated water in the primary-side heating circulation circuit 24 is still new, so there is no need to replace it. Proceed to step.
[0029]
Next, when the hot water storage control unit 14 determines that the current time is the boiling start time (S8), it sends a boiling start signal to the heating control unit 23, and the heating control unit 23 that has received the boiling start signal receives the heat pump circuit. At the same time as the heating by the heat pump 21 is started, the low-temperature water taken out from the lower part of the hot water storage tank 7 is heated to a high temperature and sequentially stacked on the upper part of the hot water storage tank 7 to store hot water (S9).
[0030]
The hot water storage control unit 14 monitors whether the hot water storage amount in the hot water storage tank 7 has reached the target heating amount by using the hot water storage temperature sensor 11 during the hot water storage operation by the heating unit 2. (S10), a boiling stop signal is sent to the heating control unit 23. Upon receiving the boiling stop signal, the heating control unit 23 stops heating by the heat pump circuit 21 and also stops the heating circulation pump 22 to perform hot water storage operation. To be completed.
[0031]
As described above, since the operation of replacing the accumulated water in the primary side heating circulation circuit 25 is performed immediately before the hot water storage operation by midnight electric power, the primary side heating circulation pump 27 is driven at approximately the same time every day. In this way, the pump drive noise at various times eliminates the user's misunderstanding of equipment failure.
[0032]
In addition, since the determination of the necessity of the operation of replacing the accumulated water in the primary side heating circulation circuit 25 depends on whether or not the primary side heating circulation pump 27 is driven within a predetermined time in the past from the predetermined reference time, it is until just before as in the past. Regardless of the heating operation, there is no waste of driving the primary side heating circulation pump 27 at the reference time, thereby saving energy.
[0033]
Further, since the operation of replacing the accumulated water in the primary side heating circulation circuit 25 is performed before the hot water storage operation, the cold accumulated water in the primary side heating circulation circuit 25 flows into the hot water storage tank 7 immediately after boiling. As a result, the temperature stratification in the hot water storage tank 7 is not immediately disturbed, the amount of heat in the hot water storage tank 7 can be used effectively, and hot water that is the highest temperature immediately after boiling is used. The heat is not circulated through the primary side heating circulation circuit 25 that does not require heating to radiate heat unnecessarily, and the heat loss can be reduced as much as possible to save energy.
[0034]
Here, the details of the operation of the drive presence / absence determination unit 33 of the heating control unit 31 will be described. The drive presence / absence determination unit 33 is realized by the count function, determination function, and storage function of the microcomputer of the heating control unit 31.
[0035]
First, when the primary side heating circulation pump 27 stops driving, counting of a predetermined time (for example, 24 hours) is started (S21). Next, it is determined whether the current time is the reference time (S22). In the present embodiment, the reference time signal from the hot water storage control unit 14 is determined as the reference time. In this case, whether or not the reference time has come is determined whether or not the heating control unit 31 has received a reference time signal.
[0036]
Then, until the heating control unit 31 receives the reference time signal, the drive presence / absence determination unit 33 determines whether the predetermined time has been counted (S23). If the predetermined time has not elapsed since the primary side heating circulation pump 27 was stopped, the process returns to S22 again to determine whether the reference time has been reached. However, the predetermined time has elapsed since the primary side heating circulation pump 27 was stopped. If so, the counter for counting the predetermined time is reset to start counting again from 0 (S24), the flag indicating that the predetermined time has been counted is set to "1", and the process returns to S22 again.
[0037]
When the heating control unit 31 receives the reference time signal, the driving presence / absence determination unit 33 checks whether the flag is “0” (S27). At this time, the flag is “1”, so the heating control unit 31 is checked. The primary side heating circulation pump 27 is not driven within a predetermined time in the past, and the heating control unit 31 drives the primary side heating circulation pump 27 for a certain period of time (for example, 5 minutes), thereby causing the primary side heating circulation circuit to 25 stagnant water is replaced.
[0038]
When the primary side heating circulation pump 27 stops driving, the driving presence / absence determination unit 33 updates the flag to “0” (S28), resets the counter for counting a predetermined time, and starts counting from 0 again. (S29).
[0039]
As described above, it is possible to determine whether or not the primary side heating circulation pump 27 is driven within a predetermined time in the past at a predetermined reference time.
[0040]
In the present embodiment, the reference time is the reference time signal from the hot water storage control unit 31. However, the present invention is not limited to this, and the heating control unit 31 itself can count the time and set the set time as the reference time. It is. In this case, it is possible to set the time for performing the operation of replacing the accumulated water in the primary side heating circulation circuit 25 on the user side. As described above, the reference time can be arbitrarily set, and the system itself can select and set a time convenient for the system, and various modifications are possible.
[0041]
Further, the present invention is not limited to this one embodiment, and various modifications are possible. For example, the heating device can be replaced by an electric heater or an electromagnetic induction heating device instead of the heat pump circuit 24, and the heating device may be directly provided inside the hot water storage tank. Furthermore, the number of hot water storage tanks is not limited to one, but may be two or more.
[0042]
As the heating terminal, a hot water type hot air heating, a hot water type floor heating or a hot water type convector can be adopted. Furthermore, in the present embodiment, the hot water in the hot water storage tank is the primary side, and heating is performed by heating the hot water in the heating terminal that is the secondary side by heat exchange. However, the present invention is limited to this form. Instead, even if the hot water in the hot water storage tank is circulated directly to the heating terminal, it is within the scope of the present invention as long as the object of the present invention is achieved.
[0043]
【The invention's effect】
At the reference time before a predetermined time before the midnight boiling start time, it is determined whether or not the heating circulation pump has been driven within the past predetermined time, and if it is driven, the unnecessary heating circulation pump is driven. If it is not energy- driven, the heating circulation pump can be driven to replace the accumulated water in the heating circulation circuit, and the accumulated water in the heating circulation circuit can be reliably replaced to ensure the sanitary safety of the hot water in the hot water storage tank. In addition, the heating circulation pump is driven at a reference time that is a predetermined time before the boiling start time in the midnight time zone , so that the user will not misunderstand that an abnormality has occurred in the device. In addition, the hot water in the heating circulation circuit is replaced before the hot water storage operation, so the hot water immediately after the hot water storage operation is replaced. Ruyori with also energy saving is less heat radiation loss, without disturbs the thermal stratification is formed in the hot water storage tank by the hot water storage operation, can be reduced heat radiation loss in the hot water storage tank.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.
FIG. 2 is a block diagram of a control unit of the same embodiment.
FIG. 3 is a flowchart for explaining the operation of the same embodiment.
FIG. 4 is a flowchart for explaining the operation of a drive presence / absence determining unit according to the same embodiment.
[Explanation of symbols]
2 Heating unit (heating device)
DESCRIPTION OF SYMBOLS 4 Heating terminal 7 Hot water storage tank 13 Hot water storage control part 24 Primary side heating circulation circuit 25 Secondary side heating circulation circuit 26 Water-water heat exchanger 27 Primary side heating circulation pump 28 Secondary side heating circulation pump 31 Heating control part 33 Existence of drive Judgment part

Claims (1)

A hot water storage tank for storing hot water, a heating device for heating the hot water in the hot water storage tank, a heating circulation circuit having a heating circulation pump for circulating the hot water in the hot water storage tank to the heating device, and hot water in the hot water storage tank A hot water supply circuit for supplying hot water, a heating circulation circuit connected to the hot water storage tank, a heating circulation pump for circulating hot water in the hot water storage tank to the heating circulation circuit, and boiling by the set time of the next day A hot water storage type hot water heater that calculates a boiling start time at which heating can be completed, and performs a hot water storage operation in which the heating device heats and stores hot water in the hot water storage tank at a boiling start time within a predetermined time zone . in, boiling predetermined time before the reference time to the heating circulation pump start time drives the forced heating circulation pump If not been driven for a predetermined time or more by the heater circulation Replacing the accumulated water in the road, the hot-water storage type hot-water supply heating system, characterized in being driven with subsequent becomes boiling start time and a heating device and the heating circulation pump that to perform the hot water storage operation.

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