JP2016191486A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress wasteful energy consumption when hot water is stored in a hot water storage tank more than necessary.SOLUTION: A boiling control unit 123, when a residual hot water amount in a hot water storage tank 11 becomes equal to or less than a lower limit level, starts a boiling operation for heating hot water stored at a lower part of the hot water storage tank 11 and returning it to an upper part of the hot water storage tank 11 by operating a tank circulation pump 66 and a heat pump 51, and when the hot water amount stored in the hot water storage tank 11 becomes equal to or greater than a boiling completion level, finishes the boiling operation. A boiling completion level setting unit 127, at the start of the boiling operation, sets the boiling completion level according to a difference between an actual hot water tapping accumulated value in a predetermined time zone and a total hot water tapping amount index value (an average value or a maximum value of the total hot water tapping amount in the predetermined time zone during the past 7 days).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water storage type hot water supply apparatus that boiles water in a hot water storage tank and supplies hot water.

  Conventionally, a hot water storage type hot water supply apparatus has been proposed in which the time of the day on which water in a hot water storage tank is boiled is determined according to the history of hot water supply operations for the past several days (see, for example, Patent Document 1).

  In the hot water storage type hot water supply apparatus described in Patent Document 1, from the history of hot water supply operation for the past 7 days, the earliest hot water supply start time, the earliest hot water start time, and the latest in the past 7 days The hot water supply end time is obtained. Then, the boiling of the water in the hot water storage tank is started from a time before the hot water supply start time that is the earliest time (a time required for boiling) and a time that is a predetermined time before the hot water filling start time. Thus, the hot water storage tank is fully stored (the hot water tank is filled with hot water).

  And when the hot water in a hot water storage tank is used and the remaining amount of hot water in a hot water storage tank falls below a predetermined level, the hot water storage tank is heated.

JP 2013-224762 A

  In the hot water storage type hot water supply apparatus, boiling is performed when the remaining amount of hot water in the hot water storage tank falls below a predetermined level, but the temperature of the hot water stored in the hot water storage tank gradually decreases due to heat dissipation. For this reason, it is not preferable that excessive hot water is stored in the hot water supply tank because energy required for boiling is wasted.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a hot water storage type hot water supply apparatus in which hot water is stored more than necessary in a hot water storage tank and wasteful energy is prevented from being consumed.

The hot water storage type hot water supply apparatus of the present invention is
A hot water storage tank in which a water supply pipe is connected to the lower part and a hot water discharge pipe is connected to the upper part, and water supplied from the water supply pipe is stored,
A tank circulation path connecting the lower and upper parts of the hot water storage tank;
A tank circulation pump for circulating hot water stored in the lower part of the hot water storage tank to the upper part of the hot water storage tank via the tank circulation path;
A tank heating section for heating hot water flowing through the tank circulation path;
A tank hot water storage amount detection unit for detecting a tank hot water storage amount that is the amount of hot water stored from the upper part of the hot water storage tank;
A tank hot water flow rate detection unit for detecting a flow rate of hot water supplied from the hot water storage tank to the hot water pipe,
Based on the flow rate detected by the tank hot water flow rate detection unit, the hot water history recording unit for recording the hot water history from the hot water storage tank to the hot water pipe in the past several days,
A total hot water quantity index value calculation unit that calculates a total hot water quantity index value that is an index value of the total amount of hot water discharged from the hot water storage tank to the hot water pipe in a predetermined time zone of the day based on the hot water history;
From the start time of the predetermined time zone on that day, the accumulation of the amount of hot water discharged from the hot water storage tank to the hot water discharge pipe based on the flow rate detected by the tank hot water flow rate detection unit is started, and the hot water storage tank is discharged from the start time. An actual hot water amount integrating unit that calculates an actual hot water amount integrated value that is an integrated value of the hot water amount;
In the predetermined time zone of the day, when the tank hot water amount detected by the hot water storage amount detection unit falls below a predetermined lower limit level, the tank circulation pump and the tank heating unit are operated to When a boiling operation for heating the hot water stored in the lower part of the tank and returning it to the upper part of the hot water storage tank is started, and when the amount of hot water stored in the tank detected by the hot water storage amount detection unit exceeds a predetermined boiling completion level And a boiling control unit for terminating the boiling operation,
A boiling completion level setting unit that sets the boiling completion level according to a difference between the total amount of hot water discharged and the actual amount of hot water discharged until the start of the boiling operation; It is characterized by that.

  According to the present invention, the hot water history recording unit records the hot water history from the hot water storage tank to the hot water pipe in the past several days. Then, the actual discharged hot water amount accumulating unit calculates a total discharged hot water amount index value, which is an index value of the total amount of hot water discharged from the hot water storage tank to the hot water discharge pipe in the predetermined time zone, based on the hot water discharge history. In addition, the actual hot water amount integrating unit integrates an actual hot water amount integrated value that is an integrated value of the hot water storage amount of the hot water storage tank from the start time of the predetermined time zone on that day.

  Then, the boiling control unit starts the boiling operation when the amount of hot water in the tank falls below the lower limit hot water storage level in the predetermined time zone of the day, and the amount of hot water in the tank is completely heated. The boiling operation is terminated when the level becomes equal to or higher than the level. The boiling completion level is determined by the boiling completion level setting unit by the boiling total level indicator and the actual total hot water until the disclosure of the boiling operation. It is set based on the difference from the integrated value amount.

  In this case, since the total hot water output index value indicates the actual usage of hot water in the past predetermined time zone, the difference between the total hot water output index value and the actual total hot water output integrated value indicates that in the predetermined time zone. The amount of hot water used in the future can be estimated. Therefore, by setting the boiling completion level based on the difference between the total hot water output index value and the actual total hot water integrated value, more hot water is stored in the hot water storage tank than necessary, and wasteful energy is consumed. It is possible to suppress consumption.

In addition, the total hot water output index value calculation unit, as the total hot water output index value, an average value of the total hot water output that is an average value of the total amount of hot water discharged from the hot water storage tank to the hot water discharge pipe in the predetermined time zone in the past several days To calculate
The boiling completion level setting unit is configured such that when the actual hot water output integrated value until the start of the boiling operation is equal to or less than the total hot water output average value, the total hot water output average value and the start of the boiling operation are set. The boiling completion level is set to be smaller as the difference from the accumulated amount of actual hot water until is smaller.

  According to this configuration, when the actual total hot water integrated value until the disclosure of the boiling operation is smaller than the total hot water amount average value, the difference between the total hot water amount average value and the actual hot water amount integrated value is smaller. It can be estimated that the amount of hot water already used in the predetermined time zone is large and the amount of hot water used in the predetermined time zone is small. Therefore, the boiling completion level setting unit sets the boiling completion level to be smaller as the difference between the total amount of hot water discharged and the actual total amount of accumulated hot water is smaller, so that more hot water than necessary is stored in the hot water storage tank. It is possible to prevent wasted energy from being stored.

  In addition, the total hot water output index value calculating unit, as the total hot water output index value, the total hot water output average value and the maximum of the total amount of hot water discharged from the hot water storage tank to the hot water discharge pipe in the predetermined time zone of the past several days When the total amount of hot water discharged up to the start of the boiling operation is greater than the average value of total hot water and less than the maximum value of total hot water, The boiling completion level is set to be smaller as the difference between the hot water maximum value and the actual amount of accumulated hot water until the start of the boiling operation is smaller.

  According to this configuration, when the amount of hot water used in the predetermined time period is large and the actual hot water amount integrated value is larger than the total hot water average value, the total hot water amount maximum value and the actual hot water amount integrated value are The boiling completion level can be set using the difference between the two.

In addition, the total hot water output index value calculation unit, as the total hot water output index value, the maximum total hot water output that is the maximum value of the total amount of hot water discharged from the hot water storage tank to the hot water discharge pipe in the predetermined time zone of the past several days To calculate
The boiling completion level setting unit is configured such that when the actual hot water output integrated value until the start of the boiling operation is equal to or less than the total hot water output maximum value, the total hot water output maximum value and the boiling operation start time are set. The boiling completion level is set to be smaller as the difference from the accumulated amount of actual hot water until is smaller.

  According to this configuration, when the integrated actual hot water amount until the start of the boiling operation is smaller than the total hot water maximum value, the difference between the total hot water maximum value and the actual hot water amount integrated value is small. It can be estimated that the amount of hot water already used in the predetermined time zone is large and the amount of hot water used in the predetermined time zone is small. Therefore, the boiling completion level setting unit sets a lower boiling completion level as the difference between the maximum total hot water output and the actual accumulated hot water integrated value is smaller. It is possible to prevent wasteful energy from being consumed due to being stored.

The block diagram of a hot water storage type hot water supply apparatus. Explanatory drawing of the hot water log | history data. Explanatory drawing of a 1st time slot | zone and a 2nd time slot | zone. Explanatory drawing of the relationship between the difference between a total amount of hot-water supply index, and the actual amount of hot-water supply, and the future amount of hot-water use anticipated. The 1st flowchart of the setting process of a boiling completion level. The 2nd flowchart of the setting process of a boiling completion level.

  An embodiment of the present invention will be described with reference to FIGS. Referring to FIG. 1, a hot water storage type hot water supply apparatus 1 of the present embodiment includes a hot water storage unit 10, a heat pump unit 50, a gas heat source unit 80, and a controller 120 that controls the overall operation of the hot water storage type hot water supply apparatus 1. Configured.

  In FIG. 1, one controller 120 is shown as the controller of the hot water storage type hot water supply apparatus 1, but the controller of the hot water storage unit 10, the controller of the heat pump unit 50, and the controller of the gas heat source unit 80 are individually provided. It is good also as a structure which controls the whole action | operation of the hot water storage type hot-water supply apparatus 1 by communication between.

  The hot water storage unit 10 includes a hot water storage tank 11, a water supply pipe 12, a hot water discharge pipe 13, and the like. The hot water storage tank 11 keeps hot water inside and stores the hot water inside the tank. The hot water storage tank 11 is disposed at substantially equal intervals in the height direction, and detects the temperature th2 to th5 of the hot water in the hot water storage tank 11 at each height. 17 and an in-tank temperature sensor 26 that is disposed above the hot water storage tank 11 and detects the temperature th1 of hot water supplied from the hot water storage tank 11 to the hot water discharge pipe 13 is provided.

  Further, in the vicinity of the connection point between the lower part of the hot water storage tank 11 and the lower part of the hot water storage tank 11 in the tank circulation path 41 connecting the upper part and the lower part of the hot water storage tank 11, the tank lower temperature for detecting the temperature th6 of hot water stored in the lower part of the hot water storage tank 11 A sensor 42 is provided. A drain valve 18 is provided at the bottom of the hot water storage tank 11 and is opened by an operator's manual operation.

  One end of the water supply pipe 12 is connected to a water supply (not shown) via a water supply port 30, and the other end is connected to the lower part of the hot water storage tank 11 to supply water to the lower part of the hot water storage tank 11. The water supply pipe 12 allows water to flow only in the direction from the water supply pipe 12 to the hot water storage tank 11 by preventing the internal pressure of the hot water storage tank 11 from becoming excessive, and to supply water from the hot water storage tank 11. A first hot water side check valve 20 is provided to prevent outflow of hot water to the pipe 12 side.

  The water supply bypass pipe 34 branched from the water supply pipe 12 communicates with the hot water discharge pipe 13 at the connection point X via the hot water supply mixing valve 21, and hot water supplied from the hot water storage tank 11 to the hot water supply pipe 13 by the hot water supply mixing valve 21. And the mixing ratio of the water supplied from the feed water bypass pipe 34 to the hot water discharge pipe 13 is changed.

  The water supply bypass pipe 34 includes a water supply temperature sensor 22 that detects a temperature Tw of water supplied to the water supply bypass pipe 34, a water-side flow sensor 23 that detects a flow rate Fw of water flowing through the water supply bypass pipe 34, and a water supply A water-side check valve 24 is provided that allows water only in the direction from the bypass pipe 34 to the hot water discharge pipe 13 and prevents outflow of hot water from the hot water discharge pipe 13 to the water supply bypass pipe 34.

  The hot water discharge pipe 13 has one end connected to the hot water supply port 31 and the other end connected to the upper part of the hot water storage tank 11. Hot water stored in the upper part of the hot water storage tank 11 is supplied from a hot water outlet pipe 13 to a hot water tap (not shown) (kitchen, washroom, bathroom currant, shower, etc.) via a hot water outlet 31. A second hot water side check valve 25 that allows the hot water pipe 13 to pass water only in the direction from the hot water storage tank 11 to the hot water discharge pipe 13 and prevents the hot water from flowing into the hot water storage tank 11 side from the hot water storage pipe 11. A hot water flow rate sensor 27 (corresponding to the tank hot water flow rate detection unit of the present invention) for detecting the flow rate Fh of hot water supplied from the hot water storage tank 11 to the hot water discharge pipe 13 is provided.

  The gas heat source unit 80 is provided in the middle of the downstream side of the connection point X with the feed water bypass pipe 34 of the tap water pipe 13. The hot water storage unit 10 bypasses the gas heat source unit 80 and is downstream of the gas heat source unit 80. A hot water bypass pipe 33 that connects the hot water outlet pipe 13 to the upstream side and a hot water bypass valve 29 that opens and closes the hot water bypass pipe 33 are provided.

  A mixing temperature sensor 28 for detecting the temperature Tm of hot water supplied to the hot water supply pipe 13 through the hot water supply mixing valve 21 is provided between the hot water supply mixing valve 21 and the branch point Y of the hot water supply pipe 13 with the hot water supply bypass pipe 33. A hot water supply temperature sensor 32 that detects the temperature of the hot water discharged from the hot water supply port 31 is provided between the joining point Z of the hot water supply pipe 13 and the hot water supply bypass pipe 33 and the hot water supply port 31.

  Detection signals from the sensors provided in the hot water storage unit 10 are input to the controller 120. Further, the operation of the hot water supply mixing valve 21 and the hot water bypass valve 29 is controlled by a control signal output from the controller 120.

  Next, the heat pump unit 50 circulates the hot water in the hot water storage tank 11 through the tank circulation path 41 and heats it, and is installed outdoors. The heat pump unit 50 includes an evaporator 53, a compressor 54, and a heat pump heat exchanger 55 (condenser) connected by a heat pump circuit 52 in which a heat medium (alternative fluorocarbon such as hydrofluorocarbon (HFC), carbon dioxide, etc.) is enclosed. ) And an expansion valve 56, and a heat pump 51 (corresponding to the tank heating section of the present invention).

  The evaporator 53 performs heat exchange between the air (outside air) supplied by the rotation of the fan 60 and the heat medium circulating in the heat pump circuit 52. The compressor 54 compresses the heat medium discharged from the evaporator 53 to high pressure and high temperature, and sends it to the heat pump heat exchanger 55. The expansion valve 56 releases the pressure of the heat medium pressurized by the compressor 54.

  The defrost valve 61 is provided so as to bypass the expansion valve 56, and defrosts the evaporator 53 with a heat medium sent from the compressor 54. Heat medium temperature sensors 62, 63 for detecting the temperature of the heat medium circulating in the heat pump circuit 52 are provided upstream and downstream of the expansion valve 56 of the heat pump circuit 52 and upstream and downstream of the compressor 54. 64 and 65 are provided, respectively. Further, the evaporator 53 is provided with an ambient temperature sensor 67 that detects the temperature Tout of the air sucked into the evaporator 53.

  The heat pump heat exchanger 55 is connected to the tank circulation path 41, and circulates in the tank circulation path 41 by heat exchange between the heat medium that has been increased in pressure and temperature by the compressor 54 and hot water flowing in the tank circulation path 41. Heat the hot water. The tank circulation path 41 is provided with a tank circulation pump 66 for circulating hot water in the hot water storage tank 11 through the tank circulation path 41.

  Hot water stored in the lower part of the hot water storage tank 11 is guided to the tank circulation path 41 by the tank circulation pump 66, heated to a predetermined temperature (boiling temperature) by the heat pump heat exchanger 55, and returned to the upper part of the hot water storage tank 11. . Thereby, hot water of a predetermined temperature is sequentially stacked from the upper part of the hot water storage tank 11 and stored.

  Note that hot water temperature sensors 68 and 69 for detecting the temperature of hot water flowing in the tank circulation path 41 are provided on the upstream side and the downstream side of the heat pump heat exchanger 55 in the tank circulation path 41. The heat pump heat exchanger 55 is provided with an ambient temperature sensor 57 that detects the ambient temperature inside the heat pump heat exchanger 55.

  Detection signals from the sensors provided in the heat pump unit 50 are input to the controller 120. The operation of the compressor 54, the tank circulation pump 66, and the fan 60 is controlled by a control signal output from the controller 120.

  Next, the gas heat source unit 80 heats hot water flowing through the hot water discharge pipe 13, and includes a hot water supply burner 81 housed in the can body 87, a hot water supply heat exchanger 82 heated by the hot water supply burner 81, and the like. ing.

  In addition, a hot water filled pipe 100 communicating with the bathtub 105 is provided in the middle of the hot water discharge pipe 13. The hot water filling pipe 100 is provided with a hot water filling valve 103 for opening and closing the hot water filling pipe 100, and the controller 120 opens the hot water filling valve 103 to open the hot water filling pipe 103 through the hot water filling pipe 100. A hot water filling operation for supplying hot water to the bathtub 105 is executed.

  Fuel gas is supplied to the hot water supply burner 81 from a gas supply pipe (not shown), and combustion air is supplied from a combustion fan (not shown). The controller 120 controls the amount of combustion of the hot water supply burner 81 by adjusting the flow rates of the fuel gas and the combustion air supplied to the hot water supply burner 81.

  The hot water supply heat exchanger 82 is connected in the middle of the hot water discharge pipe 13, and heats the hot water flowing inside by the combustion heat of the hot water supply burner 81. The hot water discharge pipe 13 is provided with a water stop valve 93 and a water amount sensor 88 in order from the upstream side. The upstream side and the downstream side of the hot water supply heat exchanger 82 are connected by a heat source bypass pipe 89, and the heat source bypass pipe 89 is provided with a heat source bypass valve 90 for adjusting the opening degree of the heat source bypass pipe 89. Yes. A heat exchanger hot water temperature sensor 91 is provided in the vicinity of the outlet of the hot water supply heat exchanger 82 of the hot water discharge pipe 13, and a heat source hot water temperature sensor 92 is provided downstream of the location where the hot water supply pipe 13 is connected to the heat source bypass pipe 89. ing.

  With this configuration, when there is no hot water in the hot water storage tank 11 (hot water condition), water supplied from the water supply pipe 12 to the hot water discharge pipe 13 through the hot water storage tank 11 and the water supply bypass pipe 34 is supplied to the hot water supply heat exchanger 82. The hot water is heated to become hot water, mixed with water from the heat source bypass pipe 89, and hot water having a target hot water supply temperature is supplied from the hot water supply port 31.

  Detection signals from the sensors provided in the gas heat source unit 80 are input to the controller 120. Further, the operation of the hot water supply burner 81, the heat source bypass valve 90, and the hot water filling valve 103 is controlled by a control signal output from the controller 120.

  The controller 120 is an electronic circuit unit configured by a CPU, a memory, and the like (not shown), and by executing a control program of the hot water storage type hot water supply device 1 held in the memory by the CPU, It functions as a control unit 122, a boiling control unit 123, a tapping history recording unit 124, a total tapping amount index value calculation unit 125, an actual tapping amount integration unit 126, and a boiling completion level setting unit 127. In addition, the controller 120 is provided with a clock unit 128 that clocks time.

  The controller 120 is connected to the remote controller 140 via a communication cable 130. The remote controller 140 includes a display 141 for displaying the operation status of the hot water storage type hot water supply apparatus 1 and the setting of operation conditions, and a switch unit 142 provided with various switches. The user of the hot water storage type hot water supply apparatus 1 operates the switch unit 142 of the remote controller 140 to set the hot water supply temperature (target hot water supply temperature) from the hot water supply port 31 or the hot water supply temperature to the bathtub 105 in the hot water filling operation (target). Set the hot water filling temperature) and the hot water filling amount (target hot water filling amount).

  When the hot water storage tank 11 has not run out of hot water and the water-side flow rate sensor 23 detects water flow exceeding the lower limit flow rate, the hot water supply control unit 121 determines whether the mixed temperature sensor 28 or the hot water supply temperature sensor 32 The hot water supply operation by the mixed temperature adjustment control for adjusting the distribution ratio of the hot water supply mixing valve 21 is executed so that the detected temperature becomes the target hot water supply temperature. At this time, the hot water supply control unit 121 closes the hot water bypass valve 29 when the hot water filling valve 103 is opened and hot water is supplied to the bathtub 105, and when the hot water filling valve 103 is closed. The hot water bypass valve 29 is opened.

  Further, the hot water supply control unit 121 closes the hot water bypass valve 29 when the hot water storage tank 11 has run out of water and the water flow rate sensor 23 detects water flow exceeding the lower limit flow rate. . Heating temperature control for adjusting the combustion amount of the hot water supply burner 81 so that the temperature detected by the heat source hot water temperature sensor 92 becomes the target hot water supply temperature when water flow exceeding the lower limit flow rate is detected by the water amount sensor 88. The hot water supply operation is executed by the above.

  The hot water filling control unit 122 opens the hot water filling valve 103 when the operation of instructing the hot water filling is performed by the switch unit 142 of the remote controller 140, and the hot water filling pipe 13 is connected to the bathtub 105 through the hot water filling pipe 100. Filling operation is performed to supply the target amount of hot water. During the hot water filling operation, the hot water supply control unit 121 sets the target hot water filling temperature to the target hot water supply temperature and executes the hot water hot water operation, whereby hot water having the target hot water filling temperature is supplied to the bathtub 105.

  The boiling control unit 123 operates the tank circulation pump 66 and the heat pump 51 to bring the hot water in the hot water storage tank 11 to the boiling temperature (for example, any one of 45 ° C., 50 ° C., 55 ° C., and 60 ° C.). A heating up heating operation is performed. The boiling control unit detects the amount of hot water stored in the hot water storage tank 11 from the detected temperatures th3 to th5 of the tank surface temperature sensors 14 to 17 and the detected temperature th6 of the tank lower temperature sensor 42.

  For example, when the detection temperature th3 of the tank surface temperature sensor 15 is near the boiling temperature and the detection temperature th4 of the tank surface temperature sensor 16 is near the feed water temperature Tw, the boiling control unit 123 is connected to the upper part of the hot water storage tank 11. It is detected that hot water is stored up to the height at which the tank surface temperature sensor 15 is disposed.

  The configuration in which the boiling control unit 123 detects the amount of hot water (tank hot water storage amount) stored in the hot water storage tank 11 based on the detection temperatures of the tank surface temperature sensors 14 to 17 and the tank lower temperature sensor 42 is as follows. This corresponds to the tank hot water storage amount detection unit of the present invention.

  As shown in FIG. 2, the hot water history recording unit 124 stores, in a memory (not shown), hot water history data indicating the result of hot water discharge from the hot water storage tank 11 to the hot water pipe 13 based on the time counted by the time measuring unit 128. Record.

  Here, FIG. 3 shows a hot water supply start time Hst, a hot water filling start time Bst, and a hot water supply end time Het (from 0:00 to 24:00) on that day (the day when the controller 120 controls the hot water storage hot water supply device 1). The heating operation is started before the hot water supply start time Hst, the time α at which the boiling operation is started, the time β at which the boiling operation is started prior to the hot water start time Bst, and the hot water supply end time Het. The stop time γ is shown.

  Here, the hot water supply start time Hst is set to the earliest time among the hot water supply start times Hst_1 to Hst_7 in the past seven days. The hot water start time Bst is set to the earliest time among the hot water start times Bst_1 to Bst_7 for the past seven days. The hot water supply end time Het is set to the third latest time among the hot water supply end times Het_1 to Het_7 in the past 7 days (which may be a period other than 7 days corresponding to the past several days of the present invention).

  In the figure, BT1 and BT2 indicate the boiling operation required until the hot water storage tank 11 is filled with hot water near the boiling temperature (until the temperature th6 detected by the tank lower temperature sensor 42 is close to the boiling temperature). Set assuming execution time.

  Then, the boiling control unit 123 starts the boiling operation at α and β to make the hot water storage tank 11 filled with hot water (full storage state). Therefore, the hot water storage tank 11 is in a fully stored state at the time of the hot water supply start time Hst and the hot water filling start time Bst.

  In addition, ST is set assuming a time when the hot water supply end time Het approaches and the boiling operation is performed from now on becomes inefficient. In this case, [alpha] to [gamma] is a boiling permission time zone in which the execution of the boiling operation is permitted.

  The first time zone TW1 (time zone before the hot water filling operation is executed) from the hot water supply start time Hst to Bst and the second time zone TW2 (hot water filling operation is started from the hot water start time Bst to Het) The later time zone) corresponds to the predetermined time zone of the present invention.

  Based on the detected flow rate Fh of the hot water flow rate sensor 27, the hot water history recording unit 124 has a first total hot water amount that is the total amount of hot water supplied from the hot water storage tank 11 to the hot water discharge pipe 13 in the first time zone TW1 for the past seven days. TV1 (TV1_1 to TV1_7) and the second total hot water amount TV2 (TV2_1 to TV2_7), which is the total amount of hot water supplied from the hot water storage tank 11 to the hot water pipe 13 in the second time zone TW2, are calculated and recorded in the memory.

  The total hot water quantity index value calculation unit 125 calculates the first total hot water quantity average value TV1_ave (average total hot water quantity of the present invention) which is an average value of the first total hot water quantities TV1_1 to TV1_7 from the past hot water history data for the past seven days shown in FIG. And a first total hot water maximum value TV1_max (corresponding to the maximum total hot water amount of the present invention) which is the maximum value among the first total hot water amounts TV1_1 to TV1_7.

  Further, the total hot water output index value calculation unit 125 calculates the second total hot water output average value TV2_ave (the total output of the present invention, which is an average value of the second total hot water output TV2_1 to TV2_7 from the hot water history data for the past seven days shown in FIG. And a second total hot water output maximum value TV2_max (corresponding to the total hot water output maximum value of the present invention), which is the maximum value of the second total hot water output TV2_1 to TV2_7.

  Based on the detected flow rate Fh of the hot water flow rate sensor 27, the actual hot water accumulating unit 126 starts the hot water supply pipe from the hot water storage tank 11 from the hot water supply start time Hst, which is the start time of the first time zone TW1. The first actual discharged hot water amount integrated value TV1_s, which is the integrated value of the amount of hot water supplied to 13, is sequentially calculated.

  Similarly, in the second time zone TW2, the actual hot water amount integrating unit 126 starts the hot water storage tank from the hot water filling start time Bst, which is the start time of the second time zone TW2, based on the detected flow rate Fh of the hot water side flow rate sensor 27. 11, a second actual hot water amount integrated value TV2_s, which is an integrated value of the amount of hot water supplied to the hot water pipe 13 from 11 is sequentially calculated.

  In the first time zone TW1, the boiling completion level setting unit 127 sets the first total hot water output average value TV1_ave or the first value when the amount of remaining hot water in the hot water storage tank 11 becomes the lower limit level Vh_lmt and the boiling operation is started. Based on a hot water amount difference ΔTV1 between the total hot water output maximum value TV1_max and the first actual hot water output integrated value TV1_s, a boiling completion level Vh_end (a hot water storage amount at which the boiling operation is finished) is set.

  Here, FIG. 4A and FIG. 4B show the hot water amount difference ΔTV1 between the first total hot water amount average value TV1_ave or the first total hot water amount maximum value TV1_max and the first actual hot water amount integrated value V1_s in the middle of the first time period TW1. The relationship with the boiling completion level Vh_end is shown.

  In FIG. 4A, since ΔTV1 is large, the amount of hot water used in the remaining time of the first time zone TW1 is expected to be large from the past hot water history. Therefore, by setting the boiling completion level Vh_end in the hot water storage tank 11 to the arrangement height L5 of the surface temperature sensor 17, it is possible to avoid the hot water storage tank 11 from running out of hot water.

  On the other hand, in FIG. 4B, since ΔTV1 is small, the amount of hot water used in the remaining time of the first time zone TW1 is expected to be small from the past hot water history. Therefore, by setting the boiling completion level Vh_end in the hot water storage tank 11 as the arrangement height L4 of the surface temperature sensor 16, the amount of hot water remaining in the hot water storage tank 11 at the end time of the first time zone TW1 can be reduced. And it can suppress that a boiling operation is performed longer than necessary and wasteful energy is consumed by this.

  Therefore, the boiling completion level setting unit 127 determines the difference between the first total hot water output average value TV1_ave or the first total hot water output maximum value TV1_max and the first actual hot water output integrated value V1_s according to the flowcharts shown in FIGS. Based on a certain first hot water difference ΔTV1, a process for setting the boiling completion level Vh_end is performed. Hereinafter, this process will be described.

  5 to 6 show processing by the boiling completion level setting unit 127 in the first time zone TW1. The boiling completion level setting unit 127 performs a process of setting the boiling completion level in the same manner also in the second time zone TW2.

  In STEP 1 of FIG. 5, the boiling completion level setting unit 127 monitors the detected temperatures th2 to th5 of the surface temperature sensors 14 to 17 after the hot water storage tank 11 is fully stored at the hot water supply start time Hst. 11, the remaining hot water storage amount is monitored, and when the remaining hot water storage amount becomes lower than the lower limit level Vh_lmt (for example, the level of the arrangement height of the surface temperature sensor 14), the heating operation by the boiling control unit 123 is started. When this happens, go to STEP2.

  In STEP2, the boiling completion level setting unit 127 determines whether or not the first actual hot water amount integrated value TV1_s accumulated from the start time of the first time zone TW1 is equal to or less than the first total hot water amount average value TV1_ave. . Then, when the first actual hot water volume integrated value TV1_s is equal to or less than the first total hot water volume average value TV1_ave, the process proceeds to STEP3, and when the first actual hot water volume integrated value TV1_s is larger than the first total hot water volume average value TV1_ave, FIG. Branch to STEP30.

  In STEP 3, the boiling completion level setting unit 127 calculates the first hot water amount difference ΔTV 1 by the following equation (1).

ΔTV1 = TV1_ave_−TV1_s (1)
However, ΔTV1: first hot water amount difference, TV1_ave: first total hot water amount average value, TV1_s: first actual hot water amount integrated value (integrated value of the hot water amount from the start time of the first time zone TW1).

  In subsequent STEP 4, the boiling completion level setting unit 127 determines whether or not the first hot water amount difference ΔTV1 is 50 liters or less. When the first hot water difference ΔTV1 is 50 liters or less, the process proceeds to STEP5, and the boiling completion level setting unit 127 sets L3 (see FIG. 4B) where the tank surface temperature sensor 16 is disposed to the boiling completion level. Set to Vh_end, proceed to STEP 6, and terminate the process.

  On the other hand, when the first hot water amount difference ΔTV1 is larger than 50 liters in STEP4, the process branches to STEP10, and the boiling completion level setting unit 127 determines whether or not the first hot water amount difference ΔTV1 is 70 liters or less. When the first hot water difference ΔTV1 is 70 liters or less, the process proceeds to STEP 11 and the boiling completion level setting unit 127 boils L4 (see FIG. 4B), which is the height of the location where the tank surface temperature sensor 17 is disposed. The raising completion level Vh_end is set, the process proceeds to STEP 6 and the process is terminated.

  On the other hand, when the first hot water difference ΔTV1 is larger than 70 liters in STEP 10, the process branches to STEP 20, and the boiling completion level setting unit 127 sets the boiling completion level Vh_end to Lmax (the tank lower temperature sensor 42). The detected temperature th6 is set to a level near the boiling temperature), and the process proceeds to STEP6 and the process is terminated.

  As a result of the processing in STEP4 to STEP5, STEP10 to STEP11, and STEP20, the boiling completion level is set to be smaller as the first hot water amount difference ΔTV1 decreases. And it can prevent that a boiling operation is performed in order to store the hot water more than necessary in the hot water storage tank 11, and useless energy is consumed.

  Next, in STEP 30 of FIG. 6, the boiling completion level setting unit 127 determines whether or not the first actual hot water amount integrated value TV1_s is equal to or less than the first total hot water amount maximum value TV1_max. When the first actual hot water output integrated value TV1_s is equal to or less than the first total hot water output maximum value TV1_max, the process proceeds to STEP 31; To do.

  In STEP 31, the boiling completion level setting unit 127 calculates the first hot water amount difference ΔTV1 by the following equation (2).

ΔTV1 = TV1_max−TV1_s (2)
However, ΔTV1: first total hot water amount difference, TV1_max: first total hot water amount maximum value, TV1_s: first actual hot water amount integrated value (integrated value of the hot water amount from the start time of the first time zone TW1).

  In subsequent STEP 32, the boiling completion level setting unit 127 determines whether or not the first hot water amount difference ΔTV1 is 50 liters or less. When the first hot water difference ΔTV1 is 50 liters or less, the process proceeds to STEP 33, and the boiling completion level setting unit 127 sets L3 (see FIG. 4B), which is the location of the tank surface temperature sensor 16, to the boiling completion level. Set to Vh_end, proceed to STEP 34, and end the process.

  On the other hand, when the first hot water amount difference ΔTV1 is larger than 50 liters in STEP32, the process branches to STEP50, and the boiling completion level setting unit 127 determines whether or not the first hot water amount difference ΔTV1 is 70 liters or less. When the first hot water difference ΔTV1 is 70 liters or less, the process proceeds to STEP 51, and the boiling completion level setting unit 127 boils L4 (see FIG. 4B), which is the height of the location where the tank surface temperature sensor 17 is disposed. The raising completion level Vh_end is set, the process proceeds to STEP 34, and the process is terminated.

  On the other hand, in STEP 50, when the first total hot water difference ΔTV1 is larger than 70 liters, the process branches to STEP 60, and the boiling completion level setting unit 127 sets the boiling completion level to Lmax (the tank lower temperature sensor 42). The detection temperature th6 is set to a level at which the detected temperature th6 is close to the boiling temperature), and the process proceeds to STEP 34, where the process ends.

  Also in STEP40, the boiling completion level setting unit 127 sets the boiling completion level Vh_end to L2, proceeds to STEP41, and ends the process.

  By the processing of STEP32 to STEP33, STEP50 to STEP51, and STEP60, as the first hot water amount difference ΔTV1 decreases, the boiling completion level is set to be small. And it can prevent that a boiling operation is performed in order to store the hot water more than necessary in the hot water storage tank 11, and useless energy is consumed.

  In the second time zone TW2, the boiling completion level setting unit 127 performs the second total hot water output average value TV2_ave or the second total hot water output maximum value TV2_max in the same manner as the processing in FIGS. 5 to 6 in the first time zone TW1. And a second hot water amount difference ΔTV2 that is a difference between the second actual hot water amount integrated value TV2_s. Then, as the second hot water amount difference ΔTV2 is smaller, the boiling completion level Vh_end is set to be smaller, whereby the boiling operation is performed to store more hot water than necessary in the hot water storage tank 11, and wasteful energy is consumed. To prevent that.

  In the present embodiment, the average total hot water output and the maximum total hot water output are used as the total hot water output index values of the present invention, but only one of the average total hot water output and the maximum total hot water output is used. May be.

  In addition to the average value of the total amount of hot water and the maximum value of the total amount of hot water, other index values such as an intermediate value of the total amount of hot water in a predetermined time zone for the past several days may be used.

  DESCRIPTION OF SYMBOLS 1 ... Hot water storage type hot water supply apparatus, 10 ... Hot water storage unit, 11 ... Hot water storage tank, 12 ... Hot water supply pipe, 13 ... Hot water supply pipe, 14-17 ... Tank surface temperature sensor (tank hot water storage amount detection part), 27 ... Hot water side flow rate sensor ( (Tank hot water flow rate detection unit), 41 ... tank circulation path, 42 ... tank lower temperature sensor (tank hot water detection unit), 50 ... heat pump unit, 51 ... heat pump (tank heating unit), 66 ... tank circulation pump, 80 ... gas Heat source unit 120, controller 121, hot water supply control unit 122, hot water control unit 123, boiling control unit 124, hot water history recording unit 125, total hot water index value calculation unit 126, actual hot water amount integration Part, 127 ... boiling completion level setting part, 128 ... timing part.

Claims (4)

A hot water storage tank in which a water supply pipe is connected to the lower part and a hot water discharge pipe is connected to the upper part, and water supplied from the water supply pipe is stored,
A tank circulation path connecting the lower and upper parts of the hot water storage tank;
A tank circulation pump for circulating hot water stored in the lower part of the hot water storage tank to the upper part of the hot water storage tank via the tank circulation path;
A tank heating section for heating hot water flowing through the tank circulation path;
A tank hot water storage amount detection unit for detecting a tank hot water storage amount that is the amount of hot water stored from the upper part of the hot water storage tank;
A tank hot water flow rate detection unit for detecting a flow rate of hot water supplied from the hot water storage tank to the hot water pipe,
Based on the flow rate detected by the tank hot water flow rate detection unit, the hot water history recording unit for recording the hot water history from the hot water storage tank to the hot water pipe in the past several days,
A total hot water quantity index value calculation unit that calculates a total hot water quantity index value that is an index value of the total amount of hot water discharged from the hot water storage tank to the hot water pipe in a predetermined time zone of the day based on the hot water history;
From the start time of the predetermined time zone on that day, the accumulation of the amount of hot water discharged from the hot water storage tank to the hot water discharge pipe based on the flow rate detected by the tank hot water flow rate detection unit is started, and the hot water storage tank is discharged from the start time. An actual hot water amount integrating unit that calculates an actual hot water amount integrated value that is an integrated value of the hot water amount;
In the predetermined time zone of the day, when the tank hot water amount detected by the hot water storage amount detection unit falls below a predetermined lower limit level, the tank circulation pump and the tank heating unit are operated to When a boiling operation for heating the hot water stored in the lower part of the tank and returning it to the upper part of the hot water storage tank is started, and when the amount of hot water stored in the tank detected by the hot water storage amount detection unit exceeds a predetermined boiling completion level And a boiling control unit for terminating the boiling operation,
A boiling completion level setting unit that sets the boiling completion level according to a difference between the total amount of hot water discharged and the actual amount of hot water discharged until the start of the boiling operation; A hot water storage type hot water supply device characterized by that. In the hot water storage type hot water supply apparatus according to claim 1,
The total hot water amount index value calculation unit calculates an average value of the total hot water amount, which is an average value of the total amount of hot water discharged from the hot water storage tank to the hot water pipe during the predetermined time period in the past several days, as the total hot water amount index value. And
The boiling completion level setting unit is configured such that when the actual hot water output integrated value until the start of the boiling operation is equal to or less than the total hot water output average value, the total hot water output average value and the start of the boiling operation are set. The hot water storage type hot water supply apparatus is characterized in that the boiling completion level is set to be smaller as the difference from the accumulated amount of actual hot water is smaller. In the hot water storage type hot water supply device according to claim 2,
The total hot water quantity index value calculation unit is the total hot water quantity index value, the total hot water quantity average value, and the maximum value of the total quantity of hot water discharged from the hot water storage tank to the hot water pipe in the predetermined time zone for the past several days. A certain total hot water amount maximum value is calculated, and when the actual hot water amount integrated value until the start of the boiling operation is greater than the total hot water amount average value and less than the total hot water amount maximum value, the total hot water amount maximum The hot water storage type hot water supply apparatus is characterized in that the boiling completion level is set to be smaller as the difference between the value and the accumulated amount of actual hot water until the start of the boiling operation is smaller. In the hot water storage type hot water supply apparatus according to claim 1,
The total hot water output index value calculation unit calculates a total hot water output maximum value that is a maximum value of the total amount of hot water discharged from the hot water storage tank to the hot water discharge pipe during the predetermined time period in the past several days as the total hot water output index value. And
The boiling completion level setting unit is configured such that when the actual hot water output integrated value until the start of the boiling operation is equal to or less than the total hot water output maximum value, the total hot water output maximum value and the boiling operation start time are set. The hot water storage type hot water supply apparatus is characterized in that the boiling completion level is set to be smaller as the difference from the accumulated amount of actual hot water is smaller.