JP5811983B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water storage tank type water heater.

  Conventionally, as this kind of water heater, there is one described in JP 2009-92289 A (Patent Document 1).

  The conventional water heater includes a hot water storage tank, boiling temperature setting means for setting the boiling temperature of the hot water in the hot water storage tank, reheating heat for exchanging heat with the hot water in the hot water storage tank and the hot water in the bath side circulation circuit. An exchange means, a bath reheating start switch, a memory for storing a history of bath reheating operation, and a boiling temperature correction means are provided. The boiling temperature correction means refers to the history of the bath reheating operation in the memory, has a history of the bath reheating start switch being pressed in the past seven days, and the boiling temperature is less than 75 ° C. In such a case, the boiling temperature is corrected to 75 ° C. to ensure sufficient capacity at the time of bathing, and the usability at the time of bathing is improved.

JP 2009-92289 A

  However, the above-mentioned conventional water heater cannot correct the boiling temperature once the boiling temperature is corrected to 75 ° C. Of course, the boiling temperature cannot be lowered appropriately according to the bath reheating history. Therefore, there is a problem that a high boiling temperature state is maintained, a heat loss from the hot water storage tank is large, and the efficiency of the heat pump is deteriorated, which is contrary to energy saving.

  Accordingly, an object of the present invention is to appropriately reduce the boiling temperature of hot water in the hot water tank according to the bathing history, to reduce heat loss from the hot water tank, and to use a heat pump. In this case, it is to provide a water heater that can achieve high energy efficiency and energy saving.

In order to solve the above problems, the water heater of the present invention is
A hot water storage tank,
Boiling temperature setting means for setting the boiling temperature of hot water in the hot water storage tank;
Bath replenishing means for exchanging heat between the hot water in the hot water storage tank and the hot water on the bath side,
Bath chasing instruction means,
A memory for storing the history of bathing and driving,
Based on the history, a boiling temperature minus correcting means for minus correcting the boiling temperature when a day in which the time of bathing operation for a day is equal to or less than a predetermined time continues beyond a set period. Bei to give a,
The boiling temperature minus correction means, the boiling temperature, to a predetermined lower limit value, by subtracting the correction by a predetermined temperature, is characterized in capable der Rukoto be negative correcting the boiling temperature .

  According to the water heater having the above configuration, the boiling temperature minus correction means is based on the history of the bath reheating operation stored in the memory, and the time of the bath reheating operation of the day is equal to or less than a predetermined time. When the day continues beyond the set period, the boiling temperature is corrected negatively. In this way, when the day of bathing operation of the day is less than the predetermined time, the boiling temperature is negatively corrected when it exceeds the set period, so the boiling temperature is excessively increased. Therefore, the heat loss from the hot water storage tank can be reduced, and when a heat pump is used, the efficiency can be increased and energy saving can be achieved.

  Here, the lower limit value is, for example, the boiling temperature A determined based on the daily use situation of hot water, the boiling temperature A which is the lower limit value, and the boiling temperature B which is determined by minus correction. When B <A, the hot water in the hot water storage tank is boiled at the boiling temperature A, which is the lower limit value.

  According to the above embodiment, the boiling temperature is corrected to a negative value up to a predetermined lower limit, but the boiling temperature is not corrected to be lower than that, so the temperature of the hot water may be too low. There is no loss in usability and convenience.

One embodiment is:
When the frequency of bathing satisfies a predetermined condition, there is provided a boiling temperature plus correction means capable of positively correcting the boiling temperature up to a predetermined upper limit value.

  According to the above embodiment, the boiling temperature plus correction means positively corrects the boiling temperature up to a predetermined upper limit value when the frequency of bathing satisfies a predetermined condition. It doesn't take too much time to chase the bath, it is convenient and convenient. In addition, since the boiling temperature has an upper limit value and does not become excessively high, energy loss such as heat dissipation becomes relatively small.

Moreover, the water heater of this invention is
A hot water storage tank,
Boiling temperature setting means for setting the boiling temperature of hot water in the hot water storage tank;
Bath replenishing means for exchanging heat between the hot water in the hot water storage tank and the hot water on the bath side,
Bath chasing instruction means,
A memory for storing the history of bathing and driving,
Based on the above history, the boiling temperature minus correction means for correcting the boiling temperature minus when the day when the required amount of heat for bathing operation of the day is less than or equal to a predetermined amount of heat continues for a set period of time. for example Bei the door,
The boiling temperature minus correction means, the boiling temperature, to a predetermined lower limit value, by subtracting the correction by a predetermined temperature, Ru can der to negative correcting the boiling temperature.

  According to the water heater having the above-described configuration, the boiling temperature minus correction means is configured such that the required amount of heat for the daily bath reheating operation is equal to or less than a predetermined amount of heat based on the history of the reheating operation stored in the memory. When one day continues beyond the set period, the boiling temperature is corrected negatively. In this way, the boiling temperature is negatively corrected when the required amount of heat for bathing operation for one day is less than the predetermined amount of heat for more than the preset period, so the boiling temperature is set excessively. Without increasing the heat dissipation, the heat loss from the hot water storage tank can be reduced, and when a heat pump is used, the efficiency can be increased to save energy.

  According to the present invention, when a day in which the bath reheating operation of the day is less than or equal to a predetermined time continues beyond the set period, or the required heat amount of the bath reheating operation of the day is determined in advance. When the day when the amount of heat is less than the set amount of heat continues beyond the set period, the boiling temperature is negatively corrected, so the boiling temperature is not increased excessively, reducing the heat loss from the hot water storage tank, Moreover, when using a heat pump, the efficiency can be made high and energy saving can be achieved.

It is a circuit diagram of the water heater of 1st Embodiment of this invention. It is a flowchart explaining operation | movement of the water heater of the said 1st Embodiment. It is a graph which shows the relationship between the day of the said 1st Embodiment, and a chasing time. It is a graph which shows the relationship between the day of the said 1st Embodiment, and a chasing correction value. It is a block diagram of the principal part of the water heater of 2nd Embodiment of this invention.

  Hereinafter, the hot water heater of this invention is demonstrated in detail by embodiment of illustration.

(First embodiment)
As shown in FIG. 1, a hot water supply apparatus according to the first embodiment includes a hot water storage tank 1, a heat pump unit 2 as a heating means for heating water in the hot water storage tank 1, hot water in a bathtub 3, and hot water in a hot water storage tank 1. And a heat exchanger 4 for bathing a bath for exchanging heat with each other.

The hot water storage tank 1 is provided with a plurality of hot water storage tank temperature sensors 88 that detect the hot water temperature at each position in the depth direction of the hot water storage tank 1.

  The heat pump unit 2 is connected to a heat pump outlet 18 at the bottom of the hot water tank 1 and a heat pump return 19 at the top of the hot water tank 1 by a boiling circuit 6 having a pump 5 for boiling. Then, by driving the boiling pump 5, low-temperature hot water at the bottom of the hot water storage tank 1 is supplied from the heat pump outlet 18 to the heat pump unit 2 and heated, and returned to the hot water storage tank 1 from the heat pump return port 19. It is like that.

  Further, the heat exchanger 4 for bathing recuperation returns to the bath retreating port 25 of the hot water tank 1 and the bath retreat by a hot water tank side bath recirculation circuit 9 having the first pump 8 for reheating. It is connected to the mouth 26. Furthermore, the heat exchanger 4 for reheating the bath is connected to the bathtub 3 by a bath-side bath recirculation circuit 12 having a second pump 11 for reheating. When the first and second pumps 8 and 11 for reheating are driven, hot water from the hot water storage tank 1 flows into the hot water storage tank side bath reheating circulation path 9, while the hot water from the hot water storage tank 1 flows from the bathtub 3 to the bathtub reheating circulation path 12. The hot water of the hot water storage tank 1 and the hot water of the bathtub 3 are heat-exchanged in the heat exchanger 4 for bathing the bath, so that the bath is chased. The heat exchanger 4 for reheating the bath, the first and second pumps 8 and 11 for reheating, the hot water tank side bath recirculation circuit 9 and the bathtub side bath recirculation circuit 12 are bath reheating means. Configure an example.

  In the bathtub side bath recirculation circuit 12, temperature sensors 13 and 14 are provided on the upstream side and the downstream side of the heat exchanger 4 for bath replenishment, the output of the temperature sensors 13 and 14, and the bathtub side bath The bath reheating heat amount can be calculated based on the flow rate of the reheating circulation path 12.

  Hot water is supplied to the mixing valve 22 from the hot water supply port 20 at the upper part of the hot water storage tank 1, and hot water and water are mixed by the mixing valve 22, so that hot water having an appropriate temperature is supplied to the faucet 23. ing.

  A water supply pipe 25 is connected to the water supply port 24 in the lower part of the hot water storage tank 1 so that a water amount equivalent to the amount of hot water discharged from the hot water supply port 20 is supplied into the hot water storage tank 1 from the water supply port 24. . The water supply pipe 25 is also connected to the mixing valve 22 so as to supply water to the mixing valve 22.

  The remote control 32 is provided with a bath reheating switch 33 as an example of a bath renewal instruction means. When the bath reheating switch 33 is turned on, the first and second pumps 8 and 11 for retreating the bath are driven to start reheating the bath for a predetermined time.

  The heat pump unit 2, the boiling pump 5, and the first and second pumps 8 and 11 for bathing are controlled by the control device 50. The control device 50 is composed of a microcomputer, and includes a memory 51, a boiling temperature setting unit 52, a boiling temperature plus correction unit 53, and a boiling temperature minus correction unit 54.

  The memory 51 stores the history (operating time) of the bath reheating means for each day, that is, the driving time of the first and second pumps 8 and 11 for retreating the bath.

  The boiling temperature setting means 52, the boiling temperature plus correction means 53, and the boiling temperature minus correction means 54 are configured by software.

Temperature setting means 52 boiling above, for example, determine the amount of hot water used from decreasing rate of the temperature of the hot water in the hot water tank 1 by a plurality of the hot water storage tank temperature sensors 88, the use quantity of water results in the stored previous certain period Based on this, the boiling temperature of the day is determined. However, the boiling temperature setting means 52 may be set to a boiling temperature set in advance for each season or temperature, or may be set by a user input.

  The boiling temperature plus correction means 53 refers to the history (operating time) of the bath reheating means stored in the memory 51, and 30 as an example of a predetermined time of the bath reheating operation of the day. When the minute is exceeded, the boiling temperature is increased by 2 ° C. per day, ie, + 2 ° C. is corrected. The boiling temperature minus correction means 54 refers to the operation time of the bath reheating means stored in the memory 51, and the day when the time of the bath reheating operation per day is 30 minutes or less is the set period. As an example, the boiling temperature is lowered by 2 ° C. per day, that is, −2 ° C. is corrected.

  Daily operations of the boiling temperature plus correction means 53 and the boiling temperature minus correction means 54 of the water heater configured as described above will be described with reference to the flowchart of FIG.

  First, in step S1, it is determined whether or not the operation time for one day of the bath chase means, that is, the bath chase time T ≦ 30 minutes is satisfied at the end of the day or at a predetermined time. If it is determined that the bath chasing time T ≦ 30 minutes is satisfied, the process proceeds to step S2.

In step S2, it is determined whether or not the days determined to be good in step S1 have continuously exceeded three days. If not, negative correction of the boiling temperature is not performed, that is,
The correction operation is terminated with the current boiling temperature.

  On the other hand, if it is determined in step S2 that the days determined to be good in step S1 have exceeded three consecutive days, the process proceeds to step S3 to determine whether or not the current boiling temperature is the lower limit value. . If the current boiling temperature is the lower limit value, the process proceeds to step S4, the boiling temperature is not corrected negatively, the boiling temperature is maintained at the lower limit value, and the correction operation is terminated.

  If it is determined in step S3 that the current boiling temperature is not the lower limit value, the process proceeds to step S5, where the boiling temperature is corrected by -2 ° C, that is, corrected by 2 ° C.

  The lower limit is, for example, the boiling temperature A determined based on the daily use situation of hot water. Then, when the boiling temperature A, which is the lower limit value, is compared with the boiling temperature B, which is determined by a negative correction, and B <A, the hot water in the hot water storage tank is lower than the lower limit boiling temperature. A will boil.

  Steps S 1, S 2, S 3, S 4 and S 5 constitute the boiling temperature minus correction means 54.

  As described above, on the basis of the operation time of the bath reheating operation stored in the memory 51, the day when the bath reheating operation time of the day is 30 minutes or less is 3 times. When the boiling temperature continues for more than a day, the boiling temperature is negatively corrected by −2 ° C. per day, so that the boiling temperature is not excessively increased and the heat dissipation loss from the hot water storage tank 1 can be reduced. Moreover, the efficiency of the heat pump unit 2 can be increased to achieve energy saving. Further, since the boiling temperature does not become lower than the lower limit value, usability is not deteriorated.

  On the other hand, if it is determined in step S1 whether or not the bath reheating time T ≦ 30 minutes is satisfied, the process proceeds to step S6 to determine whether or not the current boiling temperature is the upper limit value. To do. If YES is determined, the process proceeds to step S7, and the current boiling temperature that is the upper limit value is maintained.

  If it is determined in step S6 that the current boiling temperature is not the upper limit value, the boiling temperature is corrected to be higher by + 2 ° C.

  Steps S 1, S 6, S 7 and S 8 constitute the boiling temperature plus correction means 53.

  In this way, if the boiling temperature plus correction means 53 corrects the boiling temperature to the upper limit by + 2 ° C. when the reheating time per day exceeds 30 minutes, it is excessive for bath reheating. It does not take time and is convenient and convenient. In addition, since the boiling temperature has an upper limit value and does not become excessively high, energy loss such as heat dissipation becomes relatively small.

  3A and 3B are graphs specifically showing the above-described operation. In FIG. 3A, the horizontal axis indicates the day, the vertical axis indicates the reheating operation time, the horizontal axis in FIG. 3B indicates the day, and the vertical axis indicates the reheating correction. Represents temperature.

  As shown in FIG. 3A, during the period from the 1st day to the 5th day, since the operation time of the bath reheating means per day (refreshing time) exceeds 30 minutes, boiling occurs at the end of each day. As shown in A to E of FIG. 2B, the boiling temperature by the boiling temperature setting means 52 is corrected by + 2 ° C. with respect to the raised temperature. Here, as shown in FIG. 3B, it is assumed that the boiling temperature by the boiling temperature setting means 52 is at the lower limit value at the start.

  As shown in FIG. 3A, on the 6th and 7th days, the renewal time per day is 30 minutes or less, but the renewal time is 30 minutes or less when determining whether or not the correction on the 6th and 7th days is necessary. As shown in E of FIG. 3B, minus correction of −2 ° C. is not performed.

  As shown in FIG. 3A, on the 8th day, the reheating time per day exceeds 30 minutes, but as shown in E of FIG. 3B, the boiling temperature has already reached the upper limit value. The upper limit is maintained and no positive correction is performed.

  As shown in FIG. 3A, on the 9th to 11th consecutive days, the operation time of the bath reheating means per day (refreshing time) is 30 minutes or less, and the 12th day is also per day. Since the reheating time is 30 minutes or less, as shown in F of FIG. 3B, the boiling temperature of the boiling temperature setting means 52 is set to −2 ° C. at the end of the 12th day. to correct. On the 13th day, since the reheating time is 30 minutes or less, the boiling temperature is further corrected by −2 ° C. as indicated by G in FIG. 3B.

  The boiling temperature minus correction means 54 performs minus correction to correct by −2 ° C. at one time. When the boiling temperature reaches a predetermined lower limit value, it is not shown in FIG. The lower limit is maintained and no negative correction is performed.

  As shown in FIG. 3A, since the reheating time per day exceeds 30 minutes on the 14th day, the boiling temperature is set to 1 day by the boiling temperature plus correction means 53 as shown in H of FIG. 3B. A correction of + 2 ° C is performed. Further, as shown in FIG. 3A, since the reheating time per day exceeds 30 minutes as shown in FIG. 3A, the boiling temperature is set to 1 by the boiling temperature plus correction means 53 as shown in I of FIG. 3B. The temperature is raised by 2 ° C. per day, that is, + 2 ° C. is corrected, and the boiling temperature is corrected to the upper limit value. On the 16th day, the reheating time per day exceeds 30 minutes, but the boiling temperature has already reached the upper limit as shown in I of FIG. 3B. Not.

  In this way, if the boiling temperature plus correction means 53 corrects the boiling temperature to the upper limit by + 2 ° C. when the reheating time per day exceeds 30 minutes, it is excessive for bath reheating. It does not take time and is convenient and convenient. In addition, since the boiling temperature has an upper limit value and does not become excessively high, energy loss such as heat dissipation becomes relatively small.

  Further, the boiling temperature minus correcting means 54 determines that the day when the bath reheating operation time per day is 30 minutes or less exceeds 3 days based on the operation time of the bath reheating operation stored in the memory 51. When it continues, the boiling temperature is reduced by -2 ° C per day until the lower limit is reached, so that the boiling temperature is not excessively raised and the heat dissipation loss from the hot water storage tank 1 is reduced. It can be made small, and the efficiency of the heat pump unit 2 can be increased to save energy.

(Second Embodiment)
FIG. 4 is a block diagram illustrating a control device 60 of the water heater according to the second embodiment. Since the water heater of this 2nd Embodiment differs from 1st Embodiment only in the structure of the control apparatus 60, FIG. 1 of 1st Embodiment is used for elements other than the control apparatus 60. FIG.

  The control device 60 includes a microcomputer, and includes a memory 61, a boiling temperature setting unit 52, a boiling temperature plus correction unit 63, a boiling temperature minus correction unit 64, and a calorific value calculation unit 65.

  Since the boiling temperature setting means 52 has the same configuration as the boiling temperature setting means 52 of the first embodiment, the same reference numerals are given and description thereof is omitted.

  The memory 61 stores a history of bath reheating operation, and more specifically, the upstream side of the heat exchanger 4 for reheating the bath shown in FIG. 1 as data for calculating the amount of heat used for reheating the bath. Further, the temperature detected by the temperature sensors 13 and 14 on the downstream side and the rotational speed of the second pump 11 for reheating corresponding to the flow rate of the bathtub side reheating circulation path 12 are stored. Alternatively, although not shown, as the data for calculating the amount of heat used for bathing, the number of revolutions of the first pump 8 for reheating corresponding to the flow rate of the hot water tank side bath recirculation circuit 9 and the hot water tank You may make it memorize | store the detection temperature of the temperature sensor which is not shown in the upstream and the downstream of the heat exchanger 4 for the bath reheating in the side bath recirculation circuit 9. Further, the flow rate of the hot water tank side bath recirculation circuit 9 or the bath recirculation circuit 12 may be directly detected by a flow sensor (not shown) and stored in the memory 61.

  The calorific value calculation means 65 multiplies the difference between the detected temperatures of the temperature sensors 13 and 14 stored in the memory 61 and the flow rate of the bath-side bath recirculation circuit 12 to reheat the bath during one day. The amount of heat exchanged by the heat exchanger 4 for heat, that is, the required amount of heat for bathing is calculated.

  The boiling temperature plus correction means 63, when the required amount of heat for bathing per day calculated by the calorific value calculating means 65 exceeds a predetermined amount of heat, raises the boiling temperature by + 2 ° C. to the upper limit value. Add a positive correction. As described above, since the boiling temperature is positively corrected according to the required heat amount, the boiling temperature can be accurately matched to the required heat amount to prevent shortage of the heat amount.

  Therefore, it does not take excessive time to retreat the bath, and it is convenient and convenient. In addition, since the boiling temperature has an upper limit value and does not become excessively high, energy loss such as heat dissipation becomes relatively small.

  Further, the boiling temperature minus correction means 64 has three days as an example of the set period when the required heat amount for bathing per day calculated by the heat amount calculation means 65 is equal to or less than a predetermined heat amount. When the temperature exceeds, the boiling temperature is lowered by 2 ° C. per day, that is, a correction of −2 ° C. is performed until the lower limit is reached.

  Thus, since the boiling temperature is negatively corrected according to the required amount of heat for bathing, it is possible to reduce the heat dissipation loss from the hot water storage tank 1 without excessively raising the boiling temperature, Energy efficiency can be achieved by increasing the efficiency of the heat pump unit 2.

  Since the operation of the second embodiment is exactly the same except that the content of step S1 in the flowchart of FIG. 2 of the first embodiment is read as required heat amount ≦ predetermined heat amount, the description is omitted. Further, in FIGS. 3A and 3B of the first embodiment, if the reheating time on the vertical axis in FIG. 3A is read as the required heat amount, it conforms to the second embodiment, and thus description thereof is omitted.

  In the first and second embodiments, the boiling temperature minus correction means 54 and 64 correct each of −2 ° C., but negative correction of an arbitrary numerical value such as −1 ° C. and −3 ° C. is performed. May be.

  In the first and second embodiments, the boiling temperature minus correction means 54, 64 has a set period of 3 days as an example, but it can be of any length, such as 2 days, 4 days, or 1 week. It may be a period.

  Moreover, in the said 1st and 2nd embodiment, although the heat pump unit 2 was used as a heating means, you may use a gas kettle.

  Further, in place of the heat exchanger 9 for bathing in the first embodiment, although not shown, the circulation path from the bathtub is led into the hot water storage tank to heat the hot water in the hot water storage tank and the hot water from the bathtub. It may be exchanged.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heat pump unit 3 Bathtub 4 Heat exchanger for bath reheating 5 Pump for boiling 8 First pump for reheating 11 Second pump for reheating 33 Bath reheating switch 50, 60 Control device 51 , 61 Memory 52 Boiling temperature setting means 53, 63 Boiling temperature plus correction means 54, 64 Boiling temperature minus correction means 65 Calorie calculation means

Claims (3)

A hot water storage tank (1),
Boiling temperature setting means (52) for setting the boiling temperature of hot water in the hot water storage tank (1),
Bath reheating means (4, 8, 9, 11, 12) for exchanging heat between the hot water in the hot water storage tank (1) and the hot water on the bath side,
Bath bathing command means (33);
A memory (51, 61) for storing a history of bathing operation;
Based on the above history, when the day of the bath reheating operation of the day is less than a predetermined time, the boiling temperature minus correction means (which corrects the boiling temperature minus) 54, 64) and Bei to give a,
The boiling temperature minus correction means (54, 64) is capable of subtracting and correcting the boiling temperature by a predetermined temperature up to a predetermined lower limit value to correct the boiling temperature minus. A water heater characterized by. In the water heater according to claim 1 ,
Boiling temperature plus correction means (53, 63) capable of positively correcting the boiling temperature up to a predetermined upper limit value when the frequency of bathing satisfies a predetermined condition. A water heater characterized by that. A hot water storage tank (1),
Boiling temperature setting means (52) for setting the boiling temperature of hot water in the hot water storage tank (1),
Bath reheating means (4, 8, 9, 11, 12) for exchanging heat between the hot water in the hot water storage tank (1) and the hot water on the bath side,
Bath bathing command means (33);
A memory (61) for storing a history of bathing operation;
Based on the above history, the boiling temperature minus correction means for correcting the boiling temperature minus when the day when the required amount of heat for bathing operation of the day is less than or equal to a predetermined amount of heat continues for a set period of time. (64) and Bei to give a,
The boiling temperature minus correction means (64) is capable of subtracting and correcting the boiling temperature by a predetermined temperature up to a predetermined lower limit value to correct the boiling temperature minus. A water heater.

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