JP5353535B2 - Hot water storage water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type hot water supply device capable of bringing a bathtub closer to conditions of water temperature and water amount desired by a user while suppressing degradation of coefficient of performance of a heat pump unit. <P>SOLUTION: This storage type hot water supply device 100 includes a water supply/hot water supply circuit 50, a bath water level sensor 61P, and a controller 10. The water supply/hot water supply circuit 50 adjusts a temperature of warm water in the hot water storage tank 35 and supplies the same to a bathtub 70. The controller 10 controls additional supply of hot water and additional supply of hot water of high temperature. In the control of additional hot water supply, a water level of the warm water in the bathtub 70 is increased by supplying the warm water to the bathtub 70 by the water supply/hot water supply circuit 50 in a case when the bath water level sensor 61P detects a value less than a supplied warm water determination value predetermined so that a value in an easy-to-radiate state is lower than a value in a hard-to-radiate state. In the control of additional hot water supply of high temperature, a temperature of the bathtub 70 is raised by supplying the warm water of a temperature higher than a set temperature to the bathtub 70 by the water supply/hot water supply circuit 50. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus.

  In a hot water storage type hot water supply apparatus that uses hot water when necessary while boiling tap water and holding it in a hot water storage tank, for example, as shown in Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-271119), electric charges are compared. Heating operation is performed to fill hot water storage tanks with hot water using late-night electricity set at a reasonable price.

  In the electric water heater described in Patent Document 2 (Japanese Patent Application Laid-Open No. 5-264099), in order to avoid waste that hot water in a hot water tank boiled at midnight power remains, the hot water tank temperature is kept high to keep the bathtub warm. Proposes active use of water.

  Furthermore, in the hot water storage type water heater described in Patent Document 3 (Japanese Patent Laid-Open No. 2009-52760), when performing reheating, the hot water temperature in the bathtub is set to the target temperature based on the amount of hot water remaining in the bathtub and its temperature. It is proposed to set the additional pouring amount and the additional pouring temperature at that time.

  However, in any of the above-mentioned Patent Document 2 (Japanese Patent Laid-Open No. 5-264099) and Patent Document 3 (Japanese Patent Laid-Open No. 2009-52760), in what circumstances the hot water is added to the bathtub, No consideration has been given.

  For example, if the time from when the previous user bathed and the hot water in the tub slightly decreased until the next user bathed, it was added to reheat the hot water in the tub. It is conceivable to increase the temperature of the bathtub by pouring hot water or to increase the temperature of the bathtub with the heat of the hot water storage tank using a reheating heat exchanger.

  However, when the temperature of the water in the bathtub is increased using a reheating heat exchanger, the amount of the intermediate temperature layer of the hot water storage tank increases. For this reason, since the amount of change in enthalpy is reduced in the refrigeration cycle performed in the heat pump unit, it is difficult to maintain a good coefficient of performance (COP).

  On the other hand, if you try to raise the water temperature of the bathtub by performing additional pouring, but the amount of decrease in hot water when the previous user bathes is small, the amount that can be poured without overflowing hot water from the bathtub The amount of additional pouring is limited. Thus, when the temperature of the bathtub cannot be raised to a desired temperature only with additional pouring, a reheating heat exchanger is used as described above, and the amount of the intermediate temperature layer of the hot water storage tank is reduced. It will increase.

  The present invention has been made in view of the above points, and an object of the present invention is, for example, an intermediate temperature of a hot water storage tank that can be generated when the temperature of hot water in a bathtub is raised by heat exchange using a reheating heat exchanger or the like. An object of the present invention is to provide a hot water storage type hot water supply apparatus that can be brought close to a bathtub having a water temperature and a water amount desired by a user while suppressing a decrease in the coefficient of performance of the heat pump unit accompanying an increase in the amount of layers.

  A hot water storage type hot water supply apparatus according to a first aspect of the present invention is a hot water storage type hot water supply apparatus that stores hot water obtained by heating by a heat pump unit in a hot water storage tank, and includes a hot water supply unit, a bathtub water amount detection unit, and a control unit. . The hot water supply unit adjusts the temperature of the hot water in the hot water storage tank and supplies the hot water to the bathtub. The bathtub water volume detection unit detects at least one of the hot water level or the water volume of the bathtub. The control unit performs addition hot water control and high temperature hot water control. In addition hot water control, the control unit determines the hot water determination value so that the heat dissipation condition is lower than the heat dissipation difficult condition, and the bathtub water amount detection unit detects a value less than the hot water determination value. In such a case, the hot water supply unit supplies hot water to the bathtub to increase the hot water level or amount of water in the bathtub. In the hot water addition hot water control, the control unit raises the temperature of the bathtub by supplying hot additional water to the bathtub by the hot water supply unit.

  In general, when the amount of heat released is large, the water temperature of the bathtub tends to decrease, so the amount of heat required for heat insulation tends to increase. In such a case, in the hot water storage type hot water supply apparatus, when the operation of automatically bringing the temperature and amount of the bathtub close to the desired state is performed by setting the hot water determination value low, the hot water supply unit It becomes possible to increase the amount of hot water supplied to the bathtub. Thereby, for example, while suppressing the decrease in the coefficient of performance of the heat pump unit accompanying the increase in the amount of the intermediate temperature layer of the hot water storage tank that may occur when the temperature of the hot water in the bathtub is raised by heat exchange using a reheating heat exchanger or the like It becomes possible to approach the bathtub of the water temperature and the amount of water desired by the user.

  The hot water storage type hot water supply apparatus according to a second aspect of the present invention is the hot water storage type hot water supply apparatus according to the first aspect of the present invention, further comprising a heat radiation grasping unit for grasping information relating to the heat radiation amount or the heat radiation amount of the water in the bathtub. The control unit determines the hot water supply determination value based on the value or information obtained by the heat dissipation grasping unit.

  This hot water storage type hot water supply device has a kind of heat radiation grasping part that determines the hot water determination value, so it is possible to more accurately grasp the hot water determination value that can suppress an increase in the intermediate temperature layer of the hot water tank. become.

  A hot water storage type hot water supply apparatus according to a third aspect of the present invention is the hot water storage type hot water supply apparatus according to the second aspect of the present invention, wherein the heat radiation grasping unit grasps at least one of the outside air temperature information, the feed water temperature information of water supplied from the outside, and the calendar information. To do.

  In this hot water storage type hot water supply apparatus, the heat radiation grasping unit can determine that the amount of heat radiation is small, for example, when the grasped outside air temperature information or the feed water temperature information of water supplied from outside is high. In addition, when the season can be specified from the grasped calendar information, the heat radiation grasping unit can similarly estimate the heat radiation amount.

  The hot water storage type hot water supply apparatus according to a fourth aspect of the present invention is the hot water storage type hot water supply apparatus according to any one of the first to third aspects of the invention, wherein the temperature of the hot water in the bathtub is increased by exchanging heat between the hot water in the hot water storage tank and the hot water in the bathtub. A reheating heat exchanging unit is further provided. The control unit performs additional control to increase the temperature of the hot water in the bathtub by exchanging heat between the hot water in the hot water storage tank and the hot water in the bathtub by the additional heat exchange unit, and based on the value detected by the bathtub water amount detection unit, Prioritize either adding hot water control or chasing control.

  Even if this hot water storage system is a hot water storage system equipped with a reheating heat exchanger, the temperature and amount of water in the bathtub are automatically set to the desired state by setting the hot water determination value lower. The amount of hot water from the hot water supply unit that can be added to the bathtub when performing the approaching operation can be increased. Here, the intermediate temperature of the hot water storage tank in the supply of hot water to the bathtub using the hot water supply unit rather than the increase in the amount of the intermediate temperature layer of the hot water storage tank in the case of increasing the amount of heat of the bathtub using the additional heat exchanger The increase in the amount of layers is small. For this reason, it becomes possible to approach the bathtub of the state of the water temperature and water quantity which a user desires, suppressing the increase in the quantity of the intermediate temperature layer of a hot water storage tank.

  A hot water storage type hot water supply apparatus according to a fifth aspect of the invention is the hot water storage type hot water supply apparatus according to the fourth aspect of the invention, comprising: a bathtub set water amount reception unit that receives a set water level or a set water amount of a bathtub; and a bathtub set temperature reception unit that receives a set temperature of the bathtub. It has more. The high temperature hot water control is performed by adding a predetermined amount of high temperature additional water to the bathtub. The control unit keeps high temperature until the temperature of the hot water in the bathtub reaches the set temperature, and the water level or amount of the hot water in the bathtub reaches the set water level or the water level or the water level or water volume in the vicinity thereof. Add hot water control.

  This hot water storage type hot water supply device has a supply amount of high temperature additional water to the bathtub in the hot water supply control so that the water in the bathtub can be set at a preset water level at a set temperature. The degree of use can be effectively reduced.

  A hot water storage type hot water supply apparatus according to a sixth aspect of the present invention is the hot water storage type hot water supply apparatus according to any one of the first to fourth aspects of the present invention, further comprising a bathtub set water amount receiving unit that receives a set water level or a set water amount of the bathtub. The control unit determines the hot water determination value based on at least one of the value received by the bathtub setting water amount reception unit and the maximum water level or the maximum water amount stored in the bathtub.

  This hot water storage type hot water supply apparatus can supply hot water to the bathtub by the hot water supply unit until the user's set water level or the like reaches a level that does not overflow from the bathtub.

  A hot water storage type hot water supply apparatus according to a seventh aspect of the present invention is the hot water storage type hot water supply apparatus according to any one of the first to fourth aspects of the present invention, further comprising a bathtub set temperature receiving unit that receives a set temperature of the bathtub. The control unit determines a hot water determination value based on the set temperature.

  In this hot water storage type hot water supply apparatus, the control unit can infer that, for example, the higher the set temperature, the greater the heat release amount, and the lower the set temperature, the less the heat release amount. The value can be set so as to suppress the increase in the intermediate temperature layer of the tank. Further, since the set temperature is received by the bathtub set temperature receiving unit, it is not necessary to newly provide a means for grasping the heat radiation amount of the bathtub.

  The hot water storage type hot water supply apparatus according to an eighth aspect of the present invention is the hot water storage type hot water supply apparatus according to any one of the first to seventh aspects of the present invention, further comprising a timer unit that accepts setting of a period for causing the control unit to execute hot water supply control. The control unit determines the hot water determination value so that the longer the period set in the timer unit is, the lower the value is.

  In general, the longer the period set in the timer section, the greater the amount of heat released from the water in the bathtub, and the greater the amount of heat required for heat retention. In such a case, the hot water storage type hot water supply apparatus can increase the supply amount of hot water to the bathtub using the hot water supply section by setting the hot water supply determination value lower. It becomes possible to suppress the amount of heating by the soaking heat exchanger or the like.

  A hot water storage type hot water supply apparatus according to a ninth aspect of the present invention is the hot water storage type hot water supply apparatus according to any one of the first to eighth aspects of the present invention, further comprising a history memory for storing past values of the hot water determination value. A control part permits the start of warm water supply control, after newly setting the value of warm water determination value based on the value of the past warm water determination value stored in the history memory.

  This hot water storage type hot water supply apparatus can perform hot water supply control by setting a hot water supply determination value to a value according to the use situation of the user.

A hot water storage type hot water supply apparatus according to a tenth aspect of the present invention is the hot water storage type hot water supply apparatus according to any one of the first to ninth aspects, wherein the hot water storage tank has a cross-sectional area of 1300 cm ² or less. The internal volume of the hot water storage tank is 100 liters or more and 200 liters or less.

This hot water storage type hot water supply apparatus has a sufficient height width in a hot water storage tank having a cross-sectional area of 1300 cm ² or less and an internal volume of 100 liters or more and 200 liters or less. The temperature with the low temperature layer is difficult to mix. For this reason, it becomes easy to keep down the water temperature supplied to a heat pump unit, and it becomes possible to maintain a coefficient of performance favorably. Also, in a hot water storage tank having an inner volume smaller than the conventional hot water storage tank of 100 liters or more and 200 liters or less, the operation of the heat pump unit tends to be performed more frequently than in the past. Since the increase of the intermediate temperature layer in the hot water storage tank is suppressed in the heat retaining operation, the coefficient of performance can be kept good.

  A hot water storage type hot water supply apparatus according to an eleventh aspect of the invention is the hot water storage type hot water supply apparatus according to any one of the first to tenth aspects of the invention, wherein the working refrigerant of the heat pump unit is a carbon dioxide refrigerant.

  Since this hot water storage type hot water supply apparatus can take a larger fluctuation range of enthalpy than the conventional one in a refrigeration cycle using a carbon dioxide refrigerant, it is possible to improve the coefficient of performance.

  In the hot water storage type hot water supply apparatus according to the first aspect of the present invention, it is possible to bring the water temperature and amount of water desired by the user closer to a bathtub while suppressing a decrease in the coefficient of performance of the heat pump unit.

  In the hot water storage type hot water supply apparatus of the second aspect of the invention, it becomes possible to more accurately grasp the hot water determination value that can suppress an increase in the intermediate temperature layer of the hot water storage tank.

  In the hot water storage type hot water supply apparatus according to the third aspect of the present invention, it is possible to estimate the heat radiation amount.

  In the hot water storage type hot water supply apparatus according to the fourth aspect of the present invention, it is possible to bring the water temperature and water amount desired by the user closer to a bathtub while suppressing an increase in the amount of the intermediate temperature layer of the hot water storage tank.

  In the hot water storage type hot water supply apparatus according to the fifth aspect of the invention, it is possible to effectively reduce the degree of use of a reheating heat exchanger or the like for bringing the water in the bathtub into a set water level at a set temperature.

  In the hot water storage type hot water supply apparatus of the sixth aspect of the invention, it is possible to supply hot water to the bathtub by the hot water supply unit until the user's set water level or the like reaches a water level that does not overflow from the bathtub.

  In the hot water storage type hot water supply apparatus according to the seventh aspect of the present invention, it is not necessary to newly provide a means for grasping the heat radiation amount of the bathtub.

  In the hot water storage type hot water supply apparatus according to the eighth aspect of the invention, the amount of hot water supplied to the bathtub using the hot water supply section can be increased, and the amount of heating by the reheating heat exchanger or the like can be reduced.

  In the hot water storage type hot water supply apparatus according to the ninth aspect of the present invention, it is possible to perform hot water supply control by setting a hot water determination value to a value according to the use situation of the user.

  In the hot water storage type hot water supply apparatus of the tenth aspect of the invention, since the increase of the intermediate temperature layer in the hot water storage tank is suppressed in the heat insulation operation of the bathtub, the coefficient of performance can be kept good.

  In the hot water storage type hot water supply apparatus according to the eleventh aspect, the coefficient of performance can be improved.

1 is a schematic external view of a hot water storage type hot water supply apparatus according to an embodiment of the present invention. It is a schematic block diagram of the hot water storage type hot water supply apparatus which concerns on one Embodiment of this invention. It is a flowchart of the bath automatic control which concerns on one Embodiment of this invention. It is a schematic block diagram of the hot water storage type hot-water supply apparatus which concerns on a modification (E).

  A hot water storage type hot water supply apparatus 100 according to an embodiment of the present invention will be described with reference to the drawings.

<Configuration of hot water storage type hot water supply apparatus 100>
In FIG. 1, the external appearance schematic of the hot water storage type hot water supply apparatus 100 which concerns on one Embodiment of this invention is shown. FIG. 2 shows a schematic configuration diagram of the hot water storage type hot water supply apparatus 100.

  The hot water storage type hot water supply device 100 is a hot water supply device for storing hot water in advance or heating the hot water in the bathtub 70 before use, and the heat pump unit 1 and the hot water storage unit 3 and their management and control. The controller 10 etc. which performs are provided.

<Heat pump unit 1>
The heat pump unit 1 can function by obtaining electric power as a heat source device for producing hot water, a refrigerant circuit 20 in which a carbon dioxide refrigerant circulates, a water heat exchanger 22, an air heat exchanger fan 24F, and various sensors. Etc. The heat pump unit 1 has an instantaneous maximum heating capacity of 4.5 kW or more, and in the present embodiment, the instantaneous maximum heating capacity is 10 kW.

  The refrigerant circuit 20 includes a compressor 21, an internal heat exchanger 26, an expansion valve 23, an air heat exchanger 24, a refrigerant pipe 22 r in the water heat exchanger 22, and a refrigerant pipe 25.

  The internal heat exchanger 26 has a high-pressure side pipe 26h and a low-pressure side pipe 26l. The internal heat exchanger 26 exchanges heat between the refrigerant flowing through the high-pressure side pipe 26h and the refrigerant flowing through the low-pressure side pipe 26l. In the internal heat exchanger 26, the refrigerant flow direction flowing through the high-pressure side pipe 26h and the refrigerant flow direction flowing through the low-pressure side pipe 26l are provided in a mutually opposing relationship.

  The refrigerant pipe 25 includes a discharge side of the compressor 21, a refrigerant pipe 22 r in the water heat exchanger 22, a high-pressure side pipe 26 h in the internal heat exchanger 26, an expansion valve 23, an air heat exchanger 24, and an internal heat exchanger 26. Each device is connected in the order of the inner low pressure side pipe 26l and the suction side of the compressor 21, and the refrigerant is circulated therein.

  The water heat exchanger 22 has a refrigerant pipe 22r and a water pipe 32w. The water heat exchanger 22 heats between the high-temperature refrigerant flowing through the refrigerant pipe 22r after being discharged by the compressor 21 of the heat pump unit 1 and the water flowing through the water pipe 32w when circulating through the hot water storage unit 3 described later. Let the exchange take place. By the heat exchange in the water heat exchanger 22, the refrigerant passing through the refrigerant pipe 22r is cooled, and at the same time, the water passing through the water pipe 32w is heated to produce hot water.

  In the air heat exchange fan 24F, the air volume of the air supplied to the air heat exchanger 24 is adjusted by the controller 10. Thereby, the evaporation capacity of the refrigerant in the air heat exchanger 24 is adjusted.

  Examples of the various sensors include sensors for detecting the temperature and pressure related to the refrigerant. For example, the suction pressure sensor 20P, the suction temperature sensor 20T, the discharge pressure sensor 21P, the discharge temperature sensor 21T, the hydrothermal refrigerant temperature sensor 22T, and the outside air A temperature sensor 23T, a post-pneumatic refrigerant temperature sensor 24T, and the like are provided so that the controller 10 can grasp the detected value. The suction pressure sensor 20P detects the refrigerant pressure that passes through the suction side of the compressor 21. The suction temperature sensor 20T detects the refrigerant temperature passing through the suction side of the compressor 21. The discharge pressure sensor 21P detects the refrigerant pressure passing through the discharge side of the compressor 21. The discharge temperature sensor 21T detects the temperature of the refrigerant passing through the discharge side of the compressor 21. The refrigerant temperature sensor 22T after the hydrothermal exchange detects the temperature of the refrigerant cooled by passing through the water heat exchanger 22. The post-air heat exchange refrigerant temperature sensor 24T detects the temperature of the refrigerant after being heated in the air heat exchanger 24.

<Hot water storage unit 3>
The hot water storage unit 3 heats and stores the water supplied via the external water supply path 81 and the tank water supply path 82 from outside such as city water by the heat obtained from the heat pump unit 1, and stores the water supply path 83 for mixing while storing it. It is an apparatus for supplying the hot water mixed via the bathtub 70 grade | etc.,. The hot water storage unit 3 includes a hot water storage tank 35, a hot water storage circuit 30, a reheating heat exchanger 5, a reheating circuit 40, a bath circuit 60, a hot water supply and hot water supply circuit 50, and the like. Although not shown here, the hot water storage tank 35 is covered with a heat insulating material formed of foamed polystyrene, foamed polyethylene or the like, so that the heat in the hot water storage tank 35 is difficult to escape. The hot water produced by the hot water storage unit 3 may be used in places other than the bathtub 70, but circuits for other uses are omitted here for the sake of brevity.

(Hot water storage tank 35)
The hot water storage tank 35 is a tank that stores hot water obtained by heat obtained from the heat pump unit 1 in advance. The hot water storage tank 35 has an internal volume of about 180 liters, a cross-sectional area of about 1100 cm ² , and a vertical length of about 165 cm.

  The hot water storage tank 35 is always filled with water and / or hot water, and a hot water temperature detection sensor 36 is provided for allowing the controller 10 to grasp the amount of hot water. This hot water temperature detection sensor 36 includes a first hot water volume detection temperature sensor T1 to a sixth hot water volume detection temperature sensor T6. The first hot water amount detection temperature sensor T1 to the sixth hot water amount detection temperature sensor T6 are arranged at predetermined intervals in order from the lower side of the hot water storage tank 35 to the upper side.

(Hot water storage circuit 30)
The hot water storage circuit 30 is a circuit for transmitting the heat obtained by the heat pump unit 1 to the water or hot water in the hot water storage tank 35, and is a boiling pipe 31, a water pipe 32 w in the water heat exchanger 22, and a boiling return. It has a pipe 33 and a boiling pump 34.

  The boiling forward pipe 31 connects the vicinity of the lower end portion of the hot water storage tank 35 and the upstream end portion of the water pipe 32 w in the water heat exchanger 22. The boiling forward pipe 31 is provided with a hot water storage forward temperature sensor 31T for detecting the temperature of passing water or hot water.

  The boiling return pipe 33 connects the downstream end of the water pipe 32 w in the water heat exchanger 22 and the vicinity of the upper end of the hot water storage tank 35. The boiling return pipe 33 is provided with a hot water storage return temperature sensor 33T for detecting the temperature of the passing water or hot water.

  The boiling pump 34 is provided in the middle of the boiling forward pipe 31. In the hot water storage circuit 30, when the boiling pump 34 is driven in response to a command from the controller 10, the water in the hot water storage tank 35 or the hot water existing below is heated to the boiling pipe 31. The temperature is raised by passing through the water pipe 32 w in the water heat exchanger 22, and returned to the vicinity of the upper end of the hot water storage tank 35 via the boiling return pipe 33.

  As a result, the boundary between the hot water and water in the hot water storage tank 35 moves from top to bottom, and the amount of hot water in the hot water storage tank 35 increases.

(Remembrance heat exchanger 5)
The reheating heat exchanger 5 has a cooled pipe 42w through which hot water in the hot water storage tank 35 circulates and a heated pipe 63w through which hot water in the bathtub 70 circulates.

  In the reheating heat exchanger 5, the temperature of the hot water flowing through the heated pipe 63w can be increased by performing heat exchange between the hot water flowing through the cooled pipe 42w and the hot water flowing through the heated pipe 63w. it can.

(Remembrance circuit 40)
The reheating circuit 40 is a circuit on the heat supply side for further raising the temperature of the hot water in the bathtub 70 using the heat of the hot water stored in the hot water storage tank 35, and the reheating circuit 40 41, a cooled pipe 42 w in the additional heat exchanger 5, an additional return pipe 43, and an additional circulation pump 44.

  The retrace pipe 41 connects the vicinity of the upper end of the hot water storage tank 35 and the upstream end of the cooled pipe 42 w in the recirculation heat exchanger 5.

  The follow-up return pipe 43 connects the downstream end of the cooled pipe 42 w in the follow-up heat exchanger 5 and the vicinity of the lower end of the hot water storage tank 35.

  The follow-up circulation pump 44 is provided in the middle of the follow-up return pipe 43.

  In the reheating circuit 40, the recirculation circulation pump 44 is driven in response to a command from the controller 10, so that the hot water existing in the hot water storage tank 35 or the hot water existing above is heated. The temperature of the hot water storage tank 35 is returned to the vicinity of the lower end of the hot water storage tank 35 through the recirculation return pipe 43 while the temperature is lowered by flowing out into the pipe 41 and passing through the cooled pipe 42 w in the reheating heat exchanger 5.

(Bath circuit 60)
The bath circuit 60 is a circuit for obtaining the heat of hot water stored in the hot water storage tank 35 via the reheating circuit 40, and includes a bath outlet pipe 61, a heated pipe 63w in the reheating heat exchanger 5, It has a bath return pipe 64, a bath connection pipe 56 that is also used in the hot water supply and hot water supply circuit 50, and a bath circulation pump 62.

  The bath outlet pipe 61 connects the adapter 71 of the bathtub 70 and the upstream end of the heated pipe 63 w in the reheating heat exchanger 5. The bath outlet pipe 61 includes a bath temperature sensor 61T that detects the temperature of passing water or hot water as the hot water temperature of the bathtub 70, and a bath water level sensor 61P that detects the water level of the bathtub 70 by detecting the passing water pressure. Is provided.

  The bath circulation pump 62 is provided in the middle of the bath outlet pipe 61. The bath water level sensor 61P can always be detected, but detection by the bath temperature sensor 61T is performed by driving the bath circulation pump 62 to pass the hot water in the bathtub 70 in the vicinity of the bath temperature sensor 61T.

  The bath return pipe 64 connects the downstream end of the heated pipe 63w in the reheating heat exchanger 5 and the end of the bath connecting pipe 56 opposite to the bathtub 70 side.

  The bath connection pipe 56 connects the downstream end of the bath return pipe 64 and the adapter 71 of the bathtub 70.

  In the bath circuit 60, the bath circulation pump 62 is driven in response to a command from the controller 10, so that the hot water in the bathtub 70 flows out to the bath outlet pipe 61, and the heated pipe 63 w in the reheating heat exchanger 5 is connected. While passing through, the temperature is raised, and the bath return pipe 64 and the bath connection pipe 56 are returned to the bathtub 70.

  Thereby, the temperature of the hot water of the external bathtub 70 can be raised, and the chasing can be performed.

(Water supply hot water supply circuit 50)
The hot water supply hot water supply circuit 50 is a circuit for supplying hot water having an appropriate temperature obtained by mixing water supplied from outside and hot water in the hot water storage tank 35 to the bathtub 70. The water supply hot water supply circuit 50 includes an external water supply path 81, a tank water supply path 82, a hot water supply pipe 51, a bath hot water supply pipe 52, a bath connection pipe 56 also used in the bath circuit 60, a mixing water supply path 83, and a hot water supply mixing valve. 84.

  The external water supply path 81 and the tank water supply path 82 guide normal temperature water supplied from outside city water or the like from the vicinity of the lower end of the hot water storage tank 35 into the hot water storage tank 35. The tank water supply path 82 is provided with a water supply temperature sensor 82T for detecting the temperature of water supplied by city water.

  The hot water outlet pipe 51 is a pipe that guides hot water present in the vicinity of the upper end of the water or hot water stored in the hot water storage tank 35 to the hot water supply mixing valve 84. The hot water outlet pipe 51 is provided with a hot water temperature sensor 51T for detecting the temperature of passing water or hot water.

  The mixing water supply channel 83 is a pipe for adjusting the temperature of hot water supplied to the bathtub 70 by mixing hot city water with hot water flowing from the vicinity of the upper end of the hot water storage tank 35 through the hot water discharge pipe 51. is there. The mixing water supply path 83 connects a connecting portion between the external water supply path 81 and the tank water supply path 82 and the hot water supply mixing valve 84.

  The hot water mixing valve 84 is provided at the mixing portion between the hot water outlet pipe 51 and the mixing water supply channel 83. This hot water mixing valve 84 receives a command from the controller 10 and mixes the amount of hot water to be guided from the vicinity of the upper end of the hot water storage tank 35 to the bathtub 70 and the amount of water passing through the mixing water supply channel 83. Can be adjusted.

  The bath hot water supply pipe 52 is a pipe for supplying hot water whose temperature is adjusted while the hot water in the hot water storage tank 35 and the mixing water supply path 83 are mixed by the hot water supply mixing valve 84 to the bathtub 70 via the bath connection pipe 56. It is.

  The upstream end of the bath connection pipe 56 is connected to the downstream end of the bath hot water supply pipe 52 and the downstream end of the bath return pipe 64, and the downstream end thereof is connected to the adapter 71 of the bathtub 70. Has been.

(Controller 10)
The controller 10 includes a set temperature reception unit 10T, a set water level reception unit 10P, a memory 11, a timer 12, a high temperature addition instruction reception unit 13, a water supply determination water level setting reception unit 17, a bath automatic operation reception unit 15, and a chasing instruction reception. A portion 16 is provided.

  The set temperature receiving unit 10T receives an input of the set temperature of the bathtub 70 from the user.

  The set water level receiving unit 10P receives an input of the set water level of the bathtub 70 from the user.

  The memory 11 stores in advance data on the water level at which the bathtub 70 starts to overflow, and information on the power charge setting for each time zone of the day. The memory 11 stores various operation history data and state data as the hot water storage type hot water supply apparatus 100 is operated.

  The timer 12 counts the time during which the predetermined operation is performed, the time during which the predetermined operation is continued, or accepts the setting input of the heat retention period from the user.

  The high temperature addition instruction receiving unit 13 is a button for receiving a predetermined instruction by being pressed by the user, and hot water having a temperature higher than the set temperature adjusted by the hot water supply mixing valve 84 when pressed by the user once (here. Is set to 60 ° C.) by a predetermined amount (in this case, 20 liters), and the control to supply the bathtub 70 by the hot water supply hot water supply circuit 50 is started.

  The water supply determination water level setting reception unit 17 can set in advance a water supply determination water level that is a water level of the bathtub 70 which is a reference for starting automatic hot water supply to the bathtub 70 by the hot water supply hot water supply circuit 50 by a user in advance. it can. The water supply determination water level received by the water supply determination water level setting reception unit 17 is used as a value corrected by the controller 10 in accordance with the temperature detected by the outside air temperature sensor 23T, as will be described later.

  The reheating instruction receiving unit 16 is a button for receiving a predetermined instruction by being pressed by the user, and when it is pressed by the user, the temperature rising operation of the bathtub 70 using the additional cooking heat exchanger 5 is started. .

  The bath automatic operation reception unit 15 is a button for receiving a predetermined instruction by being pressed by the user. The bath automatic operation reception unit 15 pours hot water so that the bathtub 70 becomes a set water level at a set temperature, and has a set time (heat retention period). The heat retention control is continued so that the predetermined temperature and the predetermined water level are automatically maintained only during the period. Even during this heat retention control, if the user presses the button of the high temperature addition instruction receiving unit 13 or the user presses the button of the chasing instruction receiving unit 16, these controls are prioritized and immediately started, and the heat retaining control is performed. Even during the control, the bathtub 70 can be brought into a desired state at a timing desired by the user.

  The controller 10 grasps the amount of hot water in the hot water storage tank 35 from the values detected by the first hot water amount detection temperature sensor T1 to the sixth hot water amount detection temperature sensor T6, and the amount of hot water in the hot water storage tank 35 is greater than a predetermined amount. At the time when the amount of water is reduced, the heat pump unit 1 and the boiling pump 34 are driven to control the amount of water in the hot water storage tank 35 to be increased.

<Automatic bath control>
As shown in the flow chart of FIG. 3, the bath automatic control increases the temperature of the bathtub 70 by supplying hot water to the bathtub 70 as much as possible than the temperature increase of the bathtub 70 using the reheating heat exchanger 5. In order to be able to use many, it is control which keeps the water level which starts supply of the hot water to the bathtub 70 as low as possible.

  The controller 10 receives the water supply determination water level from the user in advance via the water supply determination water level setting reception unit 17 and stores it in the memory 11 or the like. Further, the memory 11 of the controller 10 stores the data of the heat insulation period input from the user via the timer 12.

  This bath automatic control is started when the user presses the button of the bath automatic operation reception unit 15.

  In step S11, the controller 10 starts supplying hot water adjusted by the hot water supply mixing valve 84 to the set temperature received via the set temperature receiving unit 10T to the bathtub 70 via the hot water supply hot water supply circuit 50, step The process proceeds to S12.

  In step S12, the controller 10 determines whether or not the set water level received via the set water level receiving unit 10P has been reached. If the set water level has not been reached, the process returns to step S11 and is repeated. If the set water level has been reached, the timer 12 starts counting the heat retention period and proceeds to step S13.

  In step S13, the controller 10 corrects the water supply determination water level (water level lower than the set water level) that has been received from the user in advance via the water supply determination water level setting reception unit 17 based on the temperature detected by the outside air temperature sensor 23T. Then, the corrected water supply determination water level is newly specified as the water supply determination water level, and the process proceeds to step S14.

  The water supply determination water level by the correction here is a situation in which it is difficult to radiate heat in consideration of the fact that the heat value of the hot water in the bathtub 70 is radiated more as the detected value of the outside air temperature sensor 23T is smaller (lower the outside air temperature). It is specified as a value corrected so that the situation where heat dissipation is easier than the lower value (lower water level).

  In step S <b> 14, the controller 10 determines based on the timer 12 whether the count of the heat retention period has ended. If the heat retention period has elapsed, the bath automatic control is terminated. If the heat retention period has not elapsed, the process proceeds to step S15.

  In step S15, the controller 10 grasps the water level of the bathtub 70 with the bath water level sensor 61P, and proceeds to step S16.

  In step S16, the controller 10 determines whether or not the water level of the bathtub 70 detected by the bath water level sensor 61P is equal to or lower than the set water level received via the set water level receiving unit 10P. Here, when it is not below the set water level, the process proceeds to step S17. When it is below the set water level, the process proceeds to step S20.

  In step S <b> 17, the controller 10 drives the bath circulation pump 62 to detect the bath 70 temperature by the bath temperature sensor 61 </ b> T, and then stops the bath circulation pump 62. Thereafter, the process proceeds to step S18.

  In step S18, the controller 10 determines whether the temperature of the bathtub 70 detected by the bath temperature sensor 61T is lower than the set temperature received via the set temperature receiving unit 10T. If it is not less than the set temperature, the process returns to step S14 and is repeated. If it is lower than the set temperature, the process proceeds to step S19.

  In step S <b> 19, the controller 10 causes both the recirculation circulation pump 44 and the bath circulation pump 62 to be driven simultaneously, causes the recuperation heat exchanger 5 to perform heat exchange, and sets the temperature of the warm water returning to the bathtub 70. Performs additional heat exchanging control. And it returns to step S17 and this chasing heat exchange control is continued until the temperature of the bathtub 70 reaches preset temperature.

  In step S20, the controller 10 determines whether or not the water level of the bathtub 70 detected by the bath water level sensor 61P is equal to or lower than the water supply determination water level specified in step S13. Here, when it is not below the water supply determination water level, the process returns to step S14 and is repeated. When it is below the water supply determination water level, the process proceeds to step S21.

  In step S21, the controller 10 drives the bath circulation pump 62 to detect the temperature of the bathtub 70 by the bath temperature sensor 61T, and then stops the bath circulation pump 62. Thereafter, the process proceeds to step S22.

  In step S22, the controller 10 determines whether or not the temperature of the bathtub 70 detected by the bath temperature sensor 61T is lower than the set temperature received via the set temperature receiving unit 10T. If it is not less than the set temperature, the process proceeds to step S28. When the temperature is lower than the set temperature, the process proceeds to step S23.

  In step S23, the controller 10 performs high temperature hot water control. Here, in this high temperature addition hot water control, hot water having a temperature 5 ° C. or more higher than the set temperature received by the set temperature receiving unit 10T from the user is supplied to the bathtub 70 using the hot water mixing valve 84 and the hot water supply hot water supply circuit 50. To do. Specifically, in this embodiment, only 60 liters of hot water of 60 ° C. is supplied to the bathtub 70 by one high temperature hot water control. Thereafter, the process proceeds to step S24.

  In step S24, the controller 10 determines whether or not the water level of the bathtub 70 detected by the bath water level sensor 61P is equal to or lower than the set water level received via the set water level receiving unit 10P. Here, when it is not below the set water level, the process proceeds to step S25. When the water level is lower than the set water level, the process returns to step S21, and the hot water addition hot water control is repeated until the set water level or the set temperature is reached.

  In step S <b> 25, the controller 10 drives both the recirculation circulation pump 44 and the bath circulation pump 62 at the same time, performs heat exchange in the recuperation heat exchanger 5, and sets the temperature of the hot water returning to the bathtub 70. Performs additional heat exchanging control. Then, the process proceeds to step S26.

  In step S26, the controller 10 drives the bath circulation pump 62 to detect the bath 70 temperature by the bath temperature sensor 61T, and then stops the bath circulation pump 62. Thereafter, the process proceeds to step S27.

  In step S27, the controller 10 determines whether or not the temperature of the bathtub 70 detected by the bath temperature sensor 61T is lower than the set temperature received via the set temperature receiving unit 10T. If it is not less than the set temperature, the process returns to step S14 and is repeated. When the temperature is lower than the set temperature, the process proceeds to step S25 and is repeated.

  In step S28, the controller 10 grasps the water level of the bathtub 70 with the bath water level sensor 61P, and proceeds to step S29.

  In step S29, the controller 10 determines whether or not the water level of the bathtub 70 detected by the bath water level sensor 61P is equal to or lower than the set water level received via the set water level receiving unit 10P. Here, when it is not below the set water level, the process returns to step S14 and is repeated. When it is below the set water level, the process proceeds to step S30.

  In step S30, the controller 10 uses the hot water supply mixing valve 84 and the hot water supply hot water supply circuit 50 so that the set temperature is received via the set temperature receiving unit 10T, and the hot water at the set temperature is 20 liters at a time. Addition hot water control to be performed is performed, and the process returns to step S28 and is repeated.

<Features of this embodiment>
(1)
When the temperature of the hot water in the bathtub 70 is raised by the reheating heat exchanger 5 using the heat of the hot water in the hot water storage tank 35, the temperature of the hot water that has passed through the cooled pipe 42w of the reheating heat exchanger 5 is increased. In the lowered state, it passes through the return return pipe 43 and is returned to the hot water storage tank 35 from below the hot water storage tank 35. At this time, the hot water cooled by passing through the cooled pipe 42w of the additional heat exchanger 5 follows the temperature of the hot water in the bathtub 70 (from the bathtub 70 through the bath outlet pipe 61) in accordance with the principle of heat exchange. It is not cooled to a temperature lower than the temperature of the hot water flowing into the soaking heat exchanger 5. For this reason, the temperature of the hot water returned to the lower part of the hot water storage tank 35 through the reheating return pipe 43 is high temperature hot water existing near the upper end of the hot water storage tank 35 and city water supplied near the lower end of the hot water storage tank 35. It is an intermediate temperature that is between these temperatures. Thus, when the reheating heat exchange control using the reheating heat exchanger 5 is performed, the intermediate temperature layer of the hot water storage tank 35 increases. Here, generally, the coefficient of performance of the heat pump unit 1 becomes a better value as the temperature of the water supplied to the water heat exchanger 22 through the boiling forward pipe 31 is lower. However, when the above-described reheating heat exchange control is performed, an intermediate temperature layer is increased in the hot water storage tank 35, so that the temperature of the water supplied to the water heat exchanger 22 through the boiling forward pipe 31 is lowered. It becomes impossible to maintain, and the coefficient of performance of the heat pump unit 1 is reduced.

  On the other hand, in the hot water addition hot water control, the hot water existing in the upper layer of the hot water storage tank 35 supplied to the hot water supply mixing valve 84 through the hot water discharge pipe 51 is mixed with the hot water supply via the mixing water supply channel 83. The mixing ratio of the low-temperature city water supplied to the valve 84 is adjusted in the hot water supply mixing valve 84, and hot water (described above) is added to the bathtub 70 using the bath hot water supply pipe 52 and the bath connection pipe 56 of the hot water supply hot water supply circuit 50. In the embodiment, 60 ° C.) is supplied. In this hot water addition hot water control, only low-temperature city water is supplied to the vicinity of the lower end of the hot water storage tank 35 via the tank water supply passage 82. An increase in the temperature layer is suppressed.

  In the above, in the bath automatic control performed by the hot water storage type hot water supply apparatus 100 of the present embodiment, it is not until the water level of the hot water in the bathtub 70 becomes equal to or lower than the water supply determination water level that is a lower water level than the set water level. To start. For this reason, while being able to suppress the quantity of the warm water of the bathtub 70 used as a heat radiation source small, 60 degreeC hot water can be supplied to the bathtub 70 only by the difference of a water supply determination water level and a setting water level. Thus, since it becomes possible to supply hot water of 60 ° C. to the bathtub 70 by the difference between the water supply determination water level and the set water level, the hot water to the bathtub is simply lowered by several centimeters below the set water level. More hot water can be supplied to the bathtub 70 than the conventional method which is adding. Thereby, even if the amount of 60 ° C. hot water that can be supplied to the bathtub 70 is increased as compared with the conventional case, the bath 70 reaches the set water level without reaching the set temperature due to the supply of 60 ° C. hot water. The usage-amount of the additional cooking heat exchanger 5 for raising the temperature to the set temperature can be reduced. In addition, when the set temperature is reached before the water level of the bathtub 70 reaches the set water level during the supply of 60 ° C. hot water, the hot water supply mixing valve 84 and the hot water / hot water supply are not used without using the additional cooking heat exchanger 5. The hot water adjusted to the set water temperature using the circuit 50 can be supplied to the bathtub 70 to reach the set water level. Thus, in the automatic bath control of the present embodiment, the amount of use of the additional cooking heat exchanger 5 can be reduced as much as possible. Therefore, an increase in the intermediate temperature layer of the hot water storage tank 35 is suppressed, and the coefficient of performance of the heat pump unit 1 is suppressed. Can be prevented from deteriorating.

(2)
Further, in the automatic bath control of the present embodiment, the hot water adding hot water control is prioritized over the hot water adding water control, and the hot water adding control is executed only when the bathtub 70 reaches the set temperature by the high temperature hot water adding control. It is like that. For this reason, for example, when priority is given to adding hot water control, the usage amount of the additional cooking heat exchanger 5 used for setting the bathtub 70 to the set temperature state of the set water level can be more reliably reduced.

(3)
Moreover, acquisition of the information regarding the heat dissipation amount of the bathtub 70 used for correction | amendment of a water supply determination water level is performed using the value acquired with the outside temperature sensor 23T. For this reason, the outside temperature sensor 23T for controlling the heat pump unit 1 can be used for acquiring information related to the heat radiation amount of the bathtub 70 used for correcting the water supply determination water level.

(4)
The hot water storage tank 35 of the present embodiment has an internal volume of about 180 liters, a cross-sectional area of about 1100 cm ² , a vertical length of about 165 cm, and a sufficient height, so that the upper layer portion The temperature of the high temperature layer and the low temperature layer of the lower layer are difficult to mix. For this reason, since it becomes easy to hold down the water temperature supplied to the heat pump unit 1, the coefficient of performance of the heat pump unit 1 can be maintained favorably. Further, in the hot water storage tank 35 having an internal volume of about 180 liters and smaller than the conventional hot water storage tank having an internal volume of about 370 liters, the operation of the heat pump unit 1 tends to be performed more frequently than in the past. Even so, in the heat retaining operation of the bathtub 70, the intermediate temperature layer of the hot water storage tank 35 is difficult to increase, so that the coefficient of performance can be kept good.

<Modification of the above embodiment>
(A)
In the said embodiment, the case where 20 liters of 60 degreeC hot water was supplied to the bathtub 70 in the case of high temperature addition hot water control was mentioned as an example, and was demonstrated.

  However, for example, the temperature and amount of hot water supplied to the bathtub 70 during the high-temperature hot water control are not limited to this, and may be other temperatures and amounts.

  Further, the temperature of the bathtub 70 and the bath temperature ascertained from the bath temperature sensor 61T from the set temperature received at the set temperature receiving unit 10T and the total amount of heat necessary for the bathtub 70 ascertained from the set water level received at the set water level receiving unit 10P. The amount of heat obtained by reducing the current amount of heat in the bathtub 70 ascertained from the water level of the bathtub 70 ascertained from the water level sensor 61P can be supplied to the bathtub 70 by increasing the amount of water as the difference between the set water level and the current water level. The temperature and amount of hot water to be supplied may be determined. In this case, the bathtub 70 can be quickly set to the set water level at the set temperature, and control such as additional hot water control can be eliminated.

(B)
In the said embodiment, the case where acquisition of the information regarding the thermal radiation amount of the bathtub 70 used for correction | amendment of a water supply determination water level was performed by the outside temperature sensor 23T was mentioned as an example, and was demonstrated.

  However, the acquisition of information related to the heat dissipation amount of the bathtub 70 used for the correction of the water supply determination water level may be performed, for example, by previously storing calendar information in the memory 11 of the controller 10 and correcting the information based on the calendar information. . Specifically, the summer level close to the temperature of the bathtub 70 may be corrected to a higher water level because the amount of heat release is small, and the winter level not close to the temperature of the bathtub 70 may be corrected to a lower water level because the amount of heat release is large. .

  In addition, the acquisition of information related to the heat dissipation amount of the bathtub 70 used for correction of the water supply determination water level may be performed by, for example, a value detected by the water supply temperature sensor 82T. This is because the detected value of the water supply temperature sensor 82T can estimate the heat radiation amount of the bathtub 70, similarly to the detected value of the outside air temperature sensor 23T and calendar information.

  Moreover, you may perform acquisition of the information regarding the thermal radiation amount of the bathtub 70 used for correction | amendment of a water supply determination water level by the temperature change which the bath temperature sensor 61T detects, for example.

  In addition, you may make it determine the above-mentioned specified water supply determination water level based on a setting water level, the maximum water amount of the bathtub 70 (water amount just before overflowing), etc.

  Further, the water supply determination water level may be determined based on the set temperature received by the set temperature receiving unit 10T. In this case, for example, it can be inferred that the higher the set temperature, the greater the amount of heat release, and the lower the set temperature, the less the amount of heat release. It can be set to a value that can suppress the increase. Furthermore, since the set temperature is received by the set temperature receiving unit 10T, it is not necessary to newly provide a means for grasping the heat radiation amount of the bathtub 70 or the like.

  Moreover, you may perform acquisition of the information regarding the heat dissipation amount of the bathtub 70 used for correction | amendment of a water supply determination water level by the length of the heat retention period input into the timer 12, for example. The longer the heat retention period set in the timer 12, the greater the amount of heat released from the hot water in the bathtub 70, and the greater the amount of heat required for heat retention. In such a case, by correcting so that the water supply determination water level becomes a low value, the supply amount to the bathtub 70 of hot water such as 60 ° C. by high temperature hot water control can be increased, and The amount of heating by the reheating heat exchanger 5 can be reduced.

(C)
In the said embodiment, the case where the water supply determination water level was input by the user via the water supply determination water level setting reception part 17 was mentioned and demonstrated.

  However, for example, the water supply determination water level is stored in the memory 11 as a history in the daily water supply determination water level of the above embodiment, and learned from the history data stored in the memory 11 (averaged or changed according to the day of the week). For example, a new water supply determination water level value may be determined based on the past water supply determination water level value stored in the memory 11. Thereby, it becomes possible to reflect a user's use condition with respect to a water supply determination water level.

(D)
In the said embodiment, the case where the water supply determination water level was input by the user via the water supply determination water level setting reception part 17 was mentioned and demonstrated.

  The water supply determination water level here may be, for example, a water level determined by selecting one of the water levels from among a plurality of levels determined in advance for the bathtub 70.

  In this case, it is more preferable that a plurality of water levels be determined in advance with reference to the height position of the adapter 71 of the bathtub 70.

(E)
In the said embodiment, the hot water storage type hot water supply apparatus 100 provided with the additional cooking heat exchanger 5 was mentioned and demonstrated.

  However, for example, as shown in FIG. 4, the reheating heat exchanger 5 and the reheating circuit 40 are not provided, and a bath circuit 260 having a bath-out pipe 261, a bath return pipe 264, and a tank heating unit 263. The hot water storage type hot water supply apparatus 200 provided with this may be sufficient. This in-tank heating section 263 has substantially the same function as that of the reheating heat exchanger 5. Even in this case, the problem that the intermediate temperature layer of the hot water storage tank 35 increases is the same in the reheating using the in-tank heating section 264, and therefore, the same effect as the above embodiment can be obtained. it can.

(F)
In the above embodiment, the case where the bath temperature is detected by driving the bath circulation pump 62 and allowing the hot water from the bathtub 70 to pass through the bath outlet pipe 61 has been described.

  However, for example, when the bath circulation pump 62 is kept stopped for a predetermined time after the bath circulation pump 62 is stopped, and the temperature of the hot water in the bathtub 70 needs to be grasped during that time, the controller 10 However, the detected temperature of the hot water in the latest bath 70 may be stored in the memory 11 and this data may be used. Thereby, while the start-and-stop frequency of the bath circulation pump 62 can be suppressed few, the heat dissipation from the hot water at the time of circulating the bath circuit 60 can be suppressed.

  In addition to this, when it is necessary to keep the bath circulation pump 62 stopped for a predetermined time after the bath circulation pump 62 stops and to grasp the temperature of the hot water in the bathtub 70 during that time, The controller 10 may regard the temperature of the hot water in the bathtub 70 as the set temperature and continue the above control.

(G)
In the said embodiment, when the water level of the bathtub 70 is below a setting water level, hot water type hot water supply apparatus 100 which employ | adopted the bath automatic control in which high temperature addition hot water control is performed with priority over additional heat exchange control is mentioned. explained.

  However, for example, as control for bringing the bathtub 70 into a desired state, other control for supplying hot water to the bathtub 70 during the heat retention control performed after applying hot water when the bath automatic operation reception unit 15 is pushed. In the case of having the above function, the hot water addition hot water control may be prioritized over the other control. As a result, the hot water adding hot water control can be performed without unnecessarily raising the water level of the bathtub 70.

  Moreover, the value used as the reference | standard of the water level determination of the bathtub 70 in step S16, S24 in the bath automatic control of the said embodiment is not restricted to a setting water level, For example, the water level of the vicinity of a setting water level, or a setting water level A slightly lower water level (such as a water level that is about 5 cm lower), a water level that is slightly higher than the set water level (such as a water level that is about 5 cm higher), a water level that the user inputs and sets separately, and other settings for the controller 10 It may be a water level that is specified by calculating from data such as the water level that is present. Even in this case, the water levels other than the set water level determined in this way are set to be higher than the water supply determination water level, which is a condition for starting the high temperature hot water control.

  The present invention is particularly useful when used as a hot water storage type hot water supply apparatus because it can be brought close to a bathtub having a water temperature and a water amount desired by the user while suppressing a decrease in the coefficient of performance of the heat pump unit.

1 Heat pump unit 3 Hot water storage unit 5 Reheating heat exchanger (reheating heat exchanging section)
10 Controller (control unit)
10P set water level reception part (tub setting water amount reception part)
10T set temperature reception part (bath set temperature reception part)
11 Memory (history memory)
12 Timer (Timer part)
23T outside air temperature sensor (heat dissipation grasper)
35 Hot water storage tank 50 Hot water supply hot water supply circuit (hot water supply part)
61P Bath temperature sensor (bath water volume detector)
61T bath water level sensor (heat dissipation grasping part)
70 Bathtub 82T Water supply temperature sensor (Heat dissipation grasp part)
100 Hot water storage water heater

JP 2007-271119 A Japanese Patent Laid-Open No. 5-264099 JP 2009-52760 A

Claims (11)

A hot water storage type hot water supply device (100) for storing hot water obtained by heating by a heat pump unit (1) in a hot water storage tank (35),
A hot water supply unit (50) for adjusting the temperature of the hot water in the hot water storage tank (35) and supplying the hot water to the bathtub (70);
A bathtub water amount detection unit (61P) for detecting at least one of the hot water level or the water amount of the bathtub (70);
The hot water determination value is determined so that the value in the situation in which heat dissipation is easy is lower than the condition in which heat dissipation is difficult, and the hot water is detected when the bathtub water amount detection unit (61P) detects a value less than the hot water determination value. Addition hot water control for increasing the water level or amount of hot water in the bathtub (70) by supplying hot water to the bathtub (70) by the supply unit (50), and supplying the hot water to the bathtub by the hot water supply unit (50) A control unit (10) for performing high temperature hot water control for increasing the temperature of the bathtub (70) by supplying high temperature additional water;
A hot water storage type hot water supply device (100) comprising: A heat radiation grasping part (23T, 82T, 61T) for grasping the heat radiation amount of the water in the bathtub (70) or information on the heat radiation amount is further provided,
The control unit (10) determines the hot water determination value based on the value or information grasped by the heat dissipation grasping unit (23T, 82T, 61T).
The hot water storage type hot water supply device (100) according to claim 1. The heat radiation grasping unit (23T, 82T, 61T) grasps at least one of outside air temperature information, water supply temperature information of water supplied from the outside, and calendar information.
The hot water storage type hot water supply device (100) according to claim 2. It further comprises a reheating heat exchanging section (5) for increasing the temperature of the hot water in the bathtub (70) by exchanging heat between the hot water in the hot water storage tank (35) and the hot water in the bathtub (70).
The controller (10) increases the temperature of the hot water in the bathtub (70) by heat exchange between the hot water in the hot water storage tank (35) and the hot water in the bathtub (70) by the reheating heat exchanger (5). To perform the chasing control
Based on the value detected by the bathtub water amount detection unit (61P), priority is given to either the high-temperature addition hot water control or the reheating control.
The hot water storage type hot water supply device (100) according to any one of claims 1 to 3. A bathtub setting water amount receiving unit (10P) for receiving a setting water level or a setting water amount of the bathtub (70);
A bathtub set temperature receiving unit (10T) for receiving a set temperature of the bathtub (70);
Further comprising
The high temperature hot water control is performed by adding a predetermined amount of the high temperature additional water to the bathtub (70),
The controller (10) is configured so that the temperature of the hot water in the bathtub (70) becomes the set temperature, and the water level or water amount of the hot water in the bathtub (70) is the set water level or water amount, or a water level or water volume in the vicinity The high temperature hot water control is performed until either one of the conditions is satisfied,
The hot water storage type hot water supply device (100) according to claim 4. A bathtub setting water amount receiving unit (10P) for receiving a setting water level or a setting water amount of the bathtub (70),
The control unit (10) has at least one of a value received by the bathtub setting water amount receiving unit (10P) and a maximum water level or a maximum water amount stored in the bathtub (70) as the hot water determination value. Based on
The hot water storage type hot water supply device (100) according to any one of claims 1 to 4. A bath set temperature receiving section (10T) for receiving a set temperature of the bath (70),
The control unit (10) determines the hot water determination value based on the set temperature.
The hot water storage type hot water supply device (100) according to any one of claims 1 to 4. A timer unit (12) for receiving a setting of a period for causing the control unit (10) to execute the hot water supply control;
The control unit (10) determines the hot water determination value so that the longer the period set in the timer unit (12), the lower the value.
The hot water storage type hot water supply device (100) according to any one of claims 1 to 7. A history memory (11) for storing a past value of the hot water determination value;
The controller (10) newly sets the hot water supply determination value based on the past hot water determination value stored in the history memory (11), and then starts the hot water supply control. Allow,
The hot water storage type hot water supply device (100) according to any one of claims 1 to 8. The cross-sectional area of the hot water storage tank (35) is 1300 cm ² or less,
The internal volume of the hot water storage tank (35) is not less than 100 liters and not more than 200 liters,
The hot water storage type hot water supply device (100) according to any one of claims 1 to 9. The working refrigerant of the heat pump unit (1) is a carbon dioxide refrigerant.
The hot water storage type hot water supply device (100) according to any one of claims 1 to 10.