JP2006071140A - Storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a boiling time for run-out hot water by re-boiling hot water at a temperature lower than the temperature of stored one. <P>SOLUTION: This storage type water heater comprises a hot water storage tank 1, a tapping pipe 2 provided at the upper part of the hot water storage tank 1, a water supply pipe 3 provided at the lower part of the hot water storage tank 1, a boiling pipe 4 for guiding water from the lower part of the hot water storage tank 1 to the upper part, a boiling pump 5 provided in the boiling pipe, a heating means 6 arranged on the midway of the boiling pipe for heating water supplied by the boiling pump 5, and a remaining hot water amount calculating means 31 for calculating the remaining amount of the hot water in the hot water storage tank 1. Herein, a time zone for whole amount boiling operation is set and the boiling operation of run-out hot water is set when the remaining hot water amount calculating means 31 calculates a preset remaining amount of hot water. A hot water temperature/capability level changing means 33 sets a boiling temperature during the boiling operation of the run-out hot water to be lower than a boiling temperature during the whole amount boiling operation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water storage water heater that uses electric power to boil hot water, and more particularly to a hot water storage water heater that uses a heat pump cycle that uses carbon dioxide as a refrigerant.

Conventionally, in hot water storage water heaters that use midnight power to boil the entire tank, hot water boiling operation is performed during the day to compensate for the shortage. In order to shorten the hot water boiling operation time, it has been proposed to increase the frequency of the compressor during the hot water boiling operation rather than during the midnight boiling operation (see, for example, Patent Document 1).
Conventionally, no boiling operation is performed at a temperature that lowers the temperature of hot water stored in the tank.
JP 2003-161545 A (paragraph numbers (0014) (0015), etc.)

For example, as proposed in Patent Document 1, the hot water boiling operation time can be shortened by setting the capacity of the compressor at the time of boiling water boiling operation higher than that at the time of boiling operation at midnight. .
However, there is a limit to increasing the ability on the heating means side such as a compressor. In particular, in the case of a heat pump cycle using carbon dioxide as a refrigerant, there is a disadvantage that COP is lowered.

  Then, this invention aims at shortening hot water boiling time by performing boiling increase at the temperature lower than hot water storage temperature.

The hot water storage water heater of the present invention according to claim 1 comprises a hot water storage tank, a hot water pipe provided at the upper part of the hot water storage tank, a water supply pipe provided at the lower part of the hot water storage tank, and water at the lower part of the hot water storage tank. A boiling pipe leading to the upper part, a boiling pump provided in the boiling pipe, a heating means disposed in the middle of the boiling pipe for heating water supplied by the boiling pump, and in the hot water storage tank A remaining hot water amount calculating means for calculating the remaining hot water amount, setting a time zone for performing the total boiling operation, and performing a hot water boiling operation when the predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means. It is a set hot water storage water heater, and has a hot water temperature / capacity level changing means for setting the boiling temperature during the hot water boiling operation to a temperature lower than the boiling temperature during the full boiling operation Characterized by
According to a second aspect of the present invention, there is provided a hot water storage type hot water heater comprising a hot water storage tank, a hot water pipe provided at an upper portion of the hot water storage tank, a water supply pipe provided at a lower portion of the hot water storage tank, and water at a lower portion of the hot water storage tank. A boiling pipe leading to the upper part, a boiling pump provided in the boiling pipe, a heating means disposed in the middle of the boiling pipe for heating water supplied by the boiling pump, and in the hot water storage tank A remaining hot water amount calculating means for calculating the remaining hot water amount, setting a time zone for performing the total boiling operation, and performing a hot water boiling operation when the predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means. Hot water temperature / capacity level changing means for setting the hot water temperature at the time of the hot water boiling operation to a temperature lower than the hot water temperature stored in the upper part of the hot water storage tank. Characterized by having To.
According to a third aspect of the present invention, there is provided a hot water storage type water heater comprising a hot water storage tank, a hot water pipe provided at an upper part of the hot water storage tank, a water supply pipe provided at a lower part of the hot water storage tank, and water at a lower part of the hot water storage tank. A boiling pipe leading to the upper part, a boiling pump provided in the boiling pipe, a heating means disposed in the middle of the boiling pipe for heating water supplied by the boiling pump, and in the hot water storage tank A remaining hot water amount calculating means for calculating the remaining hot water amount, setting a time zone for performing the total boiling operation, and performing a hot water boiling operation when the predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means. The set hot water storage water heater has a hot water temperature / capacity level changing means for setting the supply amount by the boiling pump to be larger during the hot water boiling operation than during the full boiling operation. Special To.
According to a fourth aspect of the present invention, there is provided the hot water storage water heater according to any one of the first to third aspects, further comprising bath automatic hot water filling means for supplying a predetermined amount of hot water to the bathtub, The hot water boiling operation is performed during a bath automatic hot water operation time period.
According to a fifth aspect of the present invention, in the hot water storage water heater according to any one of the first to third aspects, the hot water temperature during the hot water boiling operation is set to a minimum temperature among the set temperature of the hot water heater. It is characterized by doing.
According to a sixth aspect of the present invention, in the hot water storage water heater according to any one of the first to third aspects, the heating means is connected to a compressor, a radiator, an expansion valve, and an evaporator by piping. It is set as a heat pump cycle, and the capacity | capacitance of the said compressor is made higher at the time of the said hot water boiling operation than at the time of the said whole quantity boiling operation.
According to a seventh aspect of the present invention, in the hot water storage water heater according to any one of the first to third aspects, the heating means is connected to the compressor, the radiator, the expansion valve, and the evaporator by piping. In the heat pump cycle, the refrigerant used in the heat pump cycle is carbon dioxide, and the high pressure side is operated in a state exceeding the critical pressure.
The present invention according to claim 8 is the hot water storage type hot water heater according to claim 4, wherein the remaining hot water amount calculating means is provided in the hot water tank and the amount of hot water supplied to the bathtub by the automatic bath filling means. The remaining hot water amount after completion of the automatic bath filling operation is calculated from the hot water storage amount detected by the hot water storage amount detecting means.

  According to the present invention, the boiling time can be shortened without lowering the COP, and it is possible to cope with the shortage of hot water, so that the tank can be reduced in size and the amount of wasted hot water stored. Without loss, loss due to heat dissipation can be reduced.

The hot water storage type water heater according to the first embodiment of the present invention is a hot water temperature / capacity level change in which the boiling temperature at the time of hot water boiling operation is set to a temperature lower than the boiling temperature at the time of full boiling operation. It has a means. According to the present embodiment, a predetermined amount of hot water can be stored early by setting the boiling temperature low.
The hot water storage type water heater according to the second embodiment of the present invention is configured to set the boiling temperature during the hot water boiling operation to a temperature lower than the hot water temperature stored in the upper part of the hot water tank. It has capability level changing means. According to the present embodiment, a predetermined amount of hot water can be stored early by setting the boiling temperature low.
The hot water storage type hot water heater according to the third embodiment of the present invention is configured to change the hot water temperature / capability level so that the supply amount by the boiling pump is larger during the hot water boiling operation than during the full boiling operation. It is what has. According to the present embodiment, the boiling temperature is lowered by increasing the supply amount by the pump, and a predetermined amount of hot water can be stored early.
According to a fourth embodiment of the present invention, in the hot water storage water heater according to the first to third embodiments, an automatic bath filling means for supplying a predetermined amount of hot water to a bathtub is provided, and the automatic bath filling means is used. The hot water boiling operation is performed during the bath automatic bathing time. According to the present embodiment, it is possible to store a predetermined amount of warm water without causing hot water shortage even immediately after the hot water filling of the bath is completed.
In the fifth embodiment of the present invention, in the hot water storage water heater according to the first to third embodiments, the hot water temperature at the time of running out of hot water is set to the lowest temperature among the set temperature of the water heater. It is. According to the present embodiment, a predetermined amount of hot water can be stored at an early stage by setting the boiling temperature to the lowest temperature.
The sixth embodiment of the present invention is a heat pump cycle in which, in the hot water storage water heater according to the first to third embodiments, a heating means is connected to a compressor, a radiator, an expansion valve, and an evaporator by piping. Thus, the capacity of the compressor is increased during the hot water boiling operation than during the total boiling operation. According to the present embodiment, the storage time for a predetermined amount of hot water can be further shortened by increasing the capacity of the compressor.
According to a seventh embodiment of the present invention, in the hot water storage water heater according to the first to third embodiments, the heating means is a heat pump cycle in which a compressor, a radiator, an expansion valve, and an evaporator are connected by piping. The refrigerant used in the heat pump cycle is carbon dioxide, and the high pressure side is operated in a state exceeding the critical pressure. According to the present embodiment, hot water close to 90 ° C. can be stored, and hot water of about 65 ° C. considering Legionella bacteria can be stored with a high COP.
According to an eighth embodiment of the present invention, in the hot water storage type hot water heater according to the fourth embodiment, in the remaining hot water amount calculating means, the amount of hot water supplied to the bathtub by the automatic hot water filling means and the hot water storage provided in the hot water storage tank. The remaining hot water amount after completion of the automatic bath filling operation is calculated from the hot water storage amount detected by the amount detection means. According to the present embodiment, it is possible to calculate the hot water shortage before the hot water filling of the bath, and thus it is possible to reliably prevent the hot water shortage at the end of the hot water filling of the bath.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a hot water storage type water heater according to an embodiment of the present invention.
A hot water discharge pipe 2 is provided at the upper part of the hot water storage tank 1, and a water supply pipe 3 is provided at the lower part of the hot water storage tank 1. The lower part and the upper part of the hot water storage tank 1 are communicated with each other by a boiling pipe 4, and the water in the lower part of the hot water storage tank 1 is led to a radiator 6 by a boiling pump 5 and heated by the radiator 6 to become hot water. Guided to the top of the tank 1. When hot water is supplied from the hot water discharge pipe 2, water is supplied from the water supply pipe 3 into the hot water storage tank 1, and in the hot water storage tank 1, the hot water is separated into the upper part and the water from the lower part due to the difference in specific gravity, and the hot water is pushed down. Accumulated in layers. The hot water storage tank 1 is provided with a plurality of water temperature detectors 7 for detecting the upper water temperature from the lower part of the hot water storage tank 1. Here, the water temperature detector 7 a disposed at the bottom of the hot water storage tank 1 and the water temperature detector 7 b disposed above the water temperature detector 7 a are used as a water supply temperature detector, and are disposed at the top of the hot water storage tank 1. The water temperature detector 7e and the water temperature detectors 7d and 7c arranged in order below the water temperature detector 7e will be described as a remaining hot water amount detector.
The water temperature detectors (feed water temperature detectors) 7a and 7b determine that additional boiling is necessary when the temperature falls below 45 ° C, and stop boiling when the detected temperature reaches, for example, 60 ° C or higher. The water temperature detectors (remaining hot water amount detectors) 7e, 7d and 7c have hot water up to the installation position of the remaining hot water detectors 7e, 7d and 7c when the detected temperature is 60 ° C. or higher, for example. Judge that there is no hot water. Chattering is prevented by using 45 ° C. and 60 ° C. as judgment temperatures.

The heating means includes a heat pump cycle in which the compressor 10, the radiator 6, the expansion valve 12, and the evaporator 11 are connected by piping. This heat pump cycle preferably uses carbon dioxide as a refrigerant and is operated in a state exceeding the critical pressure on the high pressure side. By using such a heat pump cycle, hot water close to 90 ° C. can be stored, and hot water storing about 65 ° C. considering Legionella bacteria can be stored at a high COP.
A boiling water temperature detector 13 a is provided in the boiling pipe 4 leading to the radiator 6, and a tapping temperature detector 13 b is provided in the boiling pipe 4 on the outlet side of the radiator 6. In addition, the hot water storage type water heater according to the present embodiment includes an outside air temperature detector 13c that detects the outside air temperature.
In the above configuration, during the boiling operation, the boiling pump 5 and the compressor 10 are operated.
For example, when the boiling temperature is 90 ° C., the boiling pump 5 is adjusted to an appropriate flow rate and controlled so that the temperature of the tapping temperature detector 13b becomes 90 ° C. The temperature of the tapping water can also be controlled by controlling the heat pump cycle such as the rotational speed of the compressor 10 and the opening degree of the expansion valve 12. With the above operation, hot water of 90 ° C. is stored in the hot water storage tank 1 in order from the top, and when the incoming water temperature detector 13a detects 90 ° C., it is determined that the hot water of 90 ° C. has reached the lower part of the hot water storage tank 1, The raising pump 5 and the compressor 10 are stopped, and the boiling operation is finished.

  In the hot water storage type hot water heater according to the present embodiment, a first predetermined time zone and a second predetermined time zone are set. The first predetermined time zone is, for example, a midnight time zone from 23:00 to 7 o'clock, including a time zone in which the radiator 6 is operated and the entire amount heating operation is performed, and includes a peak shift time zone. . The peak shift time zone is a time zone in which the whole amount boiling operation is waited. The second predetermined time zone is, for example, a daytime time zone from 7 o'clock to 23 o'clock, and is a time zone during which no full boiling operation is performed. In this second predetermined time zone, the additional boiling operation is performed when it is determined that the amount of hot water is insufficient in the total boiling operation. In addition, the hot water boiling operation is performed in the peak shift time zone and the second predetermined time zone.

  The hot water storage type water heater of the present embodiment includes a remaining hot water amount calculation means 31 and a temperature detection means 32. The hot water temperature / capacity level changing means 33 sets the boiling hot water temperature and the capacity settings of the pump 5 and the compressor 10 based on signals from the remaining hot water amount calculating means 31 and the temperature detecting means 32. The boiling operation control unit 34 controls the capacities of the pump 5 and the compressor 10 based on the set contents in the hot water temperature / capacity level changing unit 33. The operation unit 35 has bath automatic setting means. When the setting is input by the bath automatic setting means, the operation unit 35 outputs a setting signal to the hot water temperature / capacity level changing means 33 and also to the bath automatic hot water filling means 36. In response to this, an operation start signal is output. The automatic bath filling means 36 mixes the hot water from the upper part of the hot water storage tank 1 and the cold water from the water supply pipe 3 so that the hot water temperature is set in advance, and supplies a preset hot water amount to the bathtub 37. To do.

The remaining hot water amount calculating means 31 calculates the remaining hot water amount from the water temperature at each position in the hot water storage tank 1 detected by the water temperature detector 7, and sends a signal to the hot water temperature / capacity level changing means 33 and the boiling operation control means 34. Output. The temperature detection means 32 outputs the temperature signals detected by the incoming water temperature detector 13a, the outgoing water temperature detector 13b, and the outside air temperature detector 13c to the hot water temperature / capability level changing means 33 and the boiling operation control means 34.
For example, when the remaining hot water amount calculating means 31 detects that the water temperature detectors (feed water temperature detectors) 7a and 7b have fallen below 45 ° C., the hot water temperature / capacity level changing means 33 determines that the total amount is being heated. It is set to the same boiling temperature (for example, 85 degreeC), and an additional boiling operation is performed. In this additional boiling operation, an operation signal is output from the boiling operation control means 34 to the pump 5 and the compressor 10 based on the set temperature. Further, the temperature detection means 32 detects the temperature of the hot water in the hot water temperature detector 13b, and the hot water temperature / capacity level changing means 33 causes the pump 5 so that the temperature of the hot water reaches a target boiling temperature (for example, 85 ° C.). And the capability of the compressor 10 is changed. Further, when the incoming water temperature at the incoming water temperature detector 13a is detected by the temperature detection means 32 and this incoming water temperature reaches the target boiling temperature (for example, 85 ° C.), the heating operation control means 34 causes the pump 5 and the compressor 10 to be heated. Stop driving. The outside air temperature at the outside air temperature detector 13c is detected by the temperature detecting means 32, and the target boiling temperature is set and changed according to the outside air temperature.
On the other hand, when the remaining water amount calculation means 31 detects that the water temperature detectors (remaining hot water amount detectors) 7e, 7d, and 7c have fallen below 45 ° C., the hot water temperature / capacity level changing means 33 performs a total boiling operation. The boiling temperature is set lower than that (for example, 65 ° C.), and the hot water boiling operation is performed. In this hot water boiling operation, an operation signal is output from the boiling operation control means 34 to the pump 5 and the compressor 10 based on the set temperature. Also, the temperature detection means 32 detects the temperature of the hot water at the hot water temperature detector 13b, and the hot water temperature / capacity level changing means 33 causes the pump 5 so that the hot water temperature becomes a target boiling temperature (for example, 65 ° C.). And the capability of the compressor 10 is changed. When it is detected by the water temperature detectors (remaining hot water amount detectors) 7e, 7d, 7c that a predetermined amount of hot water has been stored, the heating operation control means 34 stops the operation of the pump 5 and the compressor 10. .

Further, when the hot water in the hot water storage tank 1 is decreased by the automatic bath filling means 36 and the remaining hot water amount calculating means 31 detects that the water temperature detectors (remaining hot water amount detectors) 7e, 7d, 7c are below 45 ° C. The hot water temperature / capacity level changing means 33 sets the boiling temperature to a lower boiling temperature (for example, 65 ° C.) than that during the whole boiling operation, and the hot water boiling operation is performed as described above. In this case, the hot water boiling operation is performed during a bath automatic hot water operation time zone.
In the bath automatic hot water operation, since the hot water temperature and the amount of hot water supplied to the bath are set in advance, before performing hot water detection by the water temperature detectors (remaining hot water amount detectors) 7e, 7d, 7c, It is preferable to perform a hot water boiling operation. That is, the remaining hot water amount calculating means 31 uses the amount of hot water supplied to the bathtub 37 by the automatic bath filling means 36 and the hot water storage amount detecting means (water temperature detectors) 7a, 7b, 7c, 7d, 7e provided in the hot water storage tank 1. Based on the detected hot water storage amount, the remaining hot water amount after the completion of the automatic bath filling operation is calculated in advance, and the hot water boiling operation is performed before the completion of the automatic bath filling operation. Can be reliably prevented.

Although not shown, the hot water amount setting level of this embodiment is provided with a plurality of hot water amount setting levels such that level 1 has the lowest hot water amount level and level 10 has the highest hot water amount level.
For example, in the hot water amount setting levels 1 to 3, the minimum boiling temperature (65 ° C.) is set, and the time limit for additional boiling operation is varied. That is, at the hot water amount setting level 1, it is set so that no additional boiling operation during the day is performed. At the hot water setting level 3, the daytime additional boiling operation is set to be performed for a cumulative period of up to 2 hours.
In addition, in the hot water amount setting levels 4 to 10, the boiling temperature is set to be changed depending on the outside air temperature.

Next, the control flow of the hot water storage type water heater of the present embodiment will be described with reference to FIG.
First, the boiling water temperature / capacity is determined by the hot water temperature / capacity level changing means 33 (step 1). It is then determined from the current time whether it is a daytime time zone (second predetermined time zone) (step 2). If the present time is the second predetermined time zone, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is lower than the predetermined temperature (step 3).
In step 3, when the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is not lower than the predetermined temperature, the remaining hot water monitoring is continued (step 4). In step 3, when the temperature detected by the remaining hot water detectors 7c, 7d, and 7e falls below a predetermined temperature, the hot water temperature / capacity level changing means 33 causes the hot water temperature to be raised at the time of boiling operation. The temperature is lower than the temperature (for example, the minimum boiling temperature (65 ° C.)) and the capacity of the compressor 10 is changed to a capacity (for example, 9 kW) higher than the capacity (for example, 4.5 kW) during the entire boiling operation (for example, 9 kW) ( Step 5), a hot water boiling operation is performed (step 6).
Then, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, 7e exceeds a predetermined temperature (step 7).
In step 7, when the temperature detected by the remaining hot water detectors 7c, 7d, 7e does not exceed the predetermined temperature, the hot water boiling operation is continued (step 6). If it is determined in step 7 that the temperature detected by the remaining hot water detectors 7c, 7d, and 7e exceeds a predetermined temperature, the hot water boiling operation is stopped (step 8).

If it is determined in step 2 that it is not the second predetermined time zone, it is determined whether or not it is a peak shift time zone (step 9).
If it is determined in step 9 that it is the peak shift time zone, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, 7e is lower than a predetermined temperature (step 10).
If the detected temperature in the remaining hot water detectors 7c, 7d, 7e is higher than the predetermined temperature in step 10, the remaining hot water monitoring is continued (step 11). In step 10, when the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is lower than the predetermined temperature, the hot water temperature / capacity level changing means 33 raises the boiling water temperature in the boiling operation during the entire heating operation. The temperature is lower than the temperature (for example, the minimum boiling temperature (65 ° C.)) and the capacity of the compressor 10 is changed to a capacity (for example, 9 kW) higher than the capacity (for example, 4.5 kW) during the entire boiling operation (for example, 9 kW) ( Step 12), a hot water boiling operation is performed (step 13).
Then, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, and 7e exceeds a predetermined temperature (step 14).
If the detected temperature in the remaining hot water detectors 7c, 7d, 7e does not exceed the predetermined temperature in step 14, the hot water boiling operation is continued (step 13). If it is determined in step 14 that the temperature detected by the remaining hot water detectors 7c, 7d, 7e exceeds a predetermined temperature, the hot water boiling operation is stopped (step 15).

If it is determined in step 9 that it is not the peak shift time zone, it is determined whether or not the temperature detected by the feed water temperature detecting means 7a, 7b has reached the predetermined temperature at the end of the second predetermined time zone ( Step 16).
If it is determined in step 16 that the detected temperatures of the feed water temperature detecting means 7a and 7b have not reached the predetermined temperature, the whole amount boiling operation is performed as planned (step 17). If it is determined in step 16 that the temperature detected by the feed water temperature detecting means 7a, 7b is equal to or higher than the predetermined temperature, the whole amount boiling operation is not performed (step 18).

Next, the control flow at the time of bath hot water filling operation in the hot water storage type hot water heater of the present embodiment will be described with reference to FIG.
First, it is determined whether or not the bath automatic setting means has been set by the operation unit 35 (step 21). If it is determined in step 21 that bath hot water is started, it is determined whether or not the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is lower than a predetermined temperature (step 22).
If the detected temperature in the remaining hot water detectors 7c, 7d, and 7e is higher than the predetermined temperature in step 22, the remaining hot water monitoring is continued (step 23). In step 22, when the temperature detected by the remaining hot water detectors 7c, 7d, and 7e is lower than the predetermined temperature, the hot water temperature / capacity level changing means 33 raises the boiling hot water temperature during the boiling operation. The temperature is lower than the temperature (for example, the minimum boiling temperature (65 ° C.)) and the capacity of the compressor 10 is changed to a capacity (for example, 9 kW) higher than the capacity (for example, 4.5 kW) during the entire boiling operation (for example, 9 kW) ( Step 24), hot water boiling operation is performed (step 25). Then, it is determined whether the bath hot water operation has been completed (step 26). If the bath hot water operation has not been completed, it is further determined whether the bath hot water operation has been completed (step 26). ). If it is determined in step 26 that the bath hot water operation has been completed, the hot water boiling operation is also stopped (step 27).

Next, the operation | movement at the time of the hot water boiling heating operation of the hot water storage type water heater of a present Example is demonstrated using FIG.4 and FIG.5. FIG. 4 is a conceptual diagram for explaining the hot water boiling operation according to this embodiment, and FIG. 5 is a conceptual diagram for explaining the hot water boiling operation during bath hot water operation according to this embodiment.
First, as shown in FIG. 4, the whole amount heating operation is performed in a first predetermined time zone (midnight time zone). In this total amount boiling operation, the boiling set temperature is 85 ° C., and the boiling capacity in the compressor 10 is performed at a rated 4.5 kW. In the case of running out of hot water using hot water in the hot water storage tank 1 during the day and night time, in the comparative example, the boiling setting temperature is 85 ° C. and the boiling capacity of the compressor 10 is 5 kW. The case is shown in which the set temperature is 65 ° C. and the compressor 10 is heated to 9 kW. In the comparative example, the hot water boiling operation takes about 50 minutes, whereas in this example, the boiling can be completed in 27 minutes.
In FIG. 5, in the comparative example, the boiling setting temperature is 85 ° C., the boiling capacity of the compressor 10 is 5 kW, and in this embodiment, the boiling setting temperature is 65 ° C. and the boiling capacity of the compressor 10 is 9 kW. In addition, in the comparative example, the hot water boiling operation is started after completion of the automatic bath filling operation, whereas in this embodiment, the hot water boiling operation is started simultaneously with the start of the automatic bath filling operation. Yes. In the comparative example, it takes about 50 minutes for the hot water boiling operation, whereas in this embodiment, the boiling is finished when the hot water filling automatic operation ends.
Although the hot water temperature / capability level changing means 33 in the present embodiment has been described as setting the boiling temperature during the hot water boiling operation to a temperature lower than the boiling temperature during the full boiling operation, The boiling temperature at the time of hot water boiling operation may be set to a temperature lower than the hot water temperature stored in the upper part of the hot water tank. You may set so that the supply amount by a boiling pump may increase.
Further, in the hot water boiling operation in the present embodiment, the hot water temperature / capacity level changing means 33 sets the boiling water temperature to a temperature lower than the boiling temperature in the total boiling operation and the capacity of the compressor 10. As explained in the case of changing to a capacity higher than the capacity during full boiling operation, the capacity of the compressor 10 remains the same as the capacity during full boiling operation, and the boiling water temperature is increased during full boiling operation. The temperature may be lower than the boiling temperature.
Moreover, a predetermined amount of hot water can be stored at an early stage by setting the hot water temperature during the hot water boiling operation to the lowest temperature among the hot water setting temperatures.
In addition, the storage time of a predetermined amount of hot water can be further shortened by increasing the capacity of the compressor 10 during the hot water boiling operation rather than during the full amount boiling operation. In addition to the rotation speed of the machine 10, it can also be performed by control in the heat pump cycle such as the opening degree of the expansion valve 12.

  The hot water storage water heater of the present invention is particularly useful for a hot water storage water heater using a heat pump cycle using carbon dioxide as a refrigerant, and can also be applied to a hot water storage water heater using a heater or gas as a heat source.

The block diagram of the hot water storage type water heater by one Example of this invention Control flow of the hot water heater Control flow at the time of bath hot water operation in the hot water storage type water heater of this embodiment Conceptual diagram for explaining hot water boiling operation according to this embodiment Conceptual diagram for explaining hot water boiling operation during bathing operation according to this embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Hot-water supply pipe 3 Water supply pipe 4 Boiling piping 5 Boiling pump 6 Heating means (heat radiator)
7a Water temperature detector 7b Water temperature detector 7c Remaining hot water amount detector 7d Remaining hot water amount detector 7e Remaining hot water amount detector 10 Compressor 11 Evaporator 12 Expansion valve 31 Remaining hot water amount calculating means 32 Temperature detecting means 33 Hot water temperature / capability level changing means 34 Boiling operation control means 35 Operation section 36 Bath automatic hot water filling means 37 Bathtub

Claims (8)

A hot water storage tank, a hot water pipe provided in the upper part of the hot water storage tank, a water supply pipe provided in the lower part of the hot water storage tank, a heating pipe for guiding water in the lower part of the hot water storage tank to the upper part, and provided in the heating pipe A heating pump for heating water supplied by the boiling pump disposed in the middle of the boiling piping, and a remaining hot water amount calculating means for calculating the remaining hot water amount in the hot water storage tank. ,
A hot water storage water heater that sets a time zone for performing a total amount boiling operation, and sets a hot water boiling operation when a predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means,
A hot water storage type water heater, comprising: a hot water temperature / capacity level changing means for setting a boiling temperature during the hot water boiling operation to a temperature lower than a boiling temperature during the full boiling operation. A hot water storage tank, a hot water pipe provided in the upper part of the hot water storage tank, a water supply pipe provided in the lower part of the hot water storage tank, a heating pipe for guiding water in the lower part of the hot water storage tank to the upper part, and provided in the heating pipe A heating pump for heating water supplied by the boiling pump disposed in the middle of the boiling piping, and a remaining hot water amount calculating means for calculating the remaining hot water amount in the hot water storage tank. ,
A hot water storage water heater that sets a time zone for performing a total amount boiling operation, and sets a hot water boiling operation when a predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means,
Hot water storage hot water characterized by comprising hot water temperature / capacity level changing means for setting the boiling temperature during the hot water boiling operation to a temperature lower than the hot water temperature stored in the upper part of the hot water storage tank. vessel. A hot water storage tank, a hot water pipe provided in the upper part of the hot water storage tank, a water supply pipe provided in the lower part of the hot water storage tank, a heating pipe for guiding water in the lower part of the hot water storage tank to the upper part, and provided in the heating pipe A heating pump for heating water supplied by the boiling pump disposed in the middle of the boiling piping, and a remaining hot water amount calculating means for calculating the remaining hot water amount in the hot water storage tank. ,
A hot water storage water heater that sets a time zone for performing a total amount boiling operation, and sets a hot water boiling operation when a predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means,
A hot water storage type water heater comprising a hot water temperature / capacity level changing means for setting a supply amount by the boiling pump to be larger during the hot water boiling operation than during the full boiling operation.   A bath automatic hot water filling means for supplying a predetermined amount of hot water to the bathtub is provided, and the hot water boiling operation is performed during a bath automatic hot water filling operation time zone by the bath automatic hot water filling means. The hot water storage type water heater according to claim 3.   The hot water storage type water heater according to any one of claims 1 to 3, wherein the hot water temperature during the hot water boiling operation is set to a lowest temperature among the set temperature of the hot water heater.   The heating means is a heat pump cycle in which a compressor, a radiator, an expansion valve, and an evaporator are connected by piping, and the capacity of the compressor is increased during the hot water boiling operation than during the total boiling operation. The hot water storage water heater according to any one of claims 1 to 3, wherein   The heating means is a heat pump cycle in which a compressor, a radiator, an expansion valve, and an evaporator are connected by piping, the refrigerant used in the heat pump cycle is carbon dioxide, and the high pressure side is operated in a state exceeding the critical pressure. The hot water storage type water heater according to any one of claims 1 to 3, wherein In the remaining hot water amount calculating means, the amount of hot water supplied to the bathtub by the bath automatic hot water filling means and the amount of hot water detected by the hot water storage amount detecting means provided in the hot water storage tank, after the bath automatic hot water filling operation is completed. The hot water storage water heater according to claim 4, wherein the remaining hot water amount is calculated.