JP2019011931A - Hot water supply system - Google Patents

Abstract

To provide a hot water supply system capable of shortening a time required for increasing a bathtub temperature to a target temperature.SOLUTION: A controller 60 is configured to: perform first determination processing of determining whether a value obtained by subtracting a target temperature Tfrom a hot water storage tank upper part temperature Tis less than a first threshold α1; when it is determined that the value obtained by subtracting the target temperature Tfrom the hot water storage tank upper part temperature Tis not less than the first threshold α1, operate a reheating mechanism 50 so as to perform reheating operation without performing hot water supply operation; and when it is determined that the value obtained by subtracting the target temperature Tfrom the hot water storage tank upper part temperature Tis less than the first threshold α1, operate a heat pump unit 30 so as to perform the hot water supply operation, and at the same time, operate the reheating mechanism 50 so as to perform the reheating operation.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a technology of a hot water supply system that warms hot water in a bathtub with a heat medium.

  Conventionally, the technique of the hot water supply system which heats the hot water in a bathtub with a heat medium is known. For example, as described in Patent Document 1.

  Patent Document 1 describes a hot water supply system that includes a hot water storage tank, a heating device (specifically, a heat pump or the like) that heats hot water in the hot water storage tank, and a control device that operates the heating device during night time. Has been. The hot water storage tank is provided with a hot water supply pipe, and hot water in the hot water storage tank is supplied to the bathtub or the like through the hot water supply pipe. Based on the predicted weather information for the next day and the predicted usage heat amount of the hot water in the hot water storage tank for the next day, the control device appropriately operates the heating device in the night time zone. As described above, by operating the heating device at night, there is an advantage that heating can be performed using midnight power (inexpensive power).

  However, in order to produce the entire amount of hot water demand in one day only at midnight, it is necessary to increase the hot water storage temperature in the hot water storage tank. When the hot water storage temperature is increased, COP (Coefficient of Performance) decreases. Furthermore, since the difference between the hot water storage temperature and the outside air temperature increases, the hot water storage loss increases. For this reason, from the viewpoint of COP and hot water storage loss, it is desirable to operate the heating device efficiently regardless of day and night and to reduce the hot water storage temperature.

  However, when such low-temperature hot water storage is performed, the difference between the hot water temperature and the bathtub temperature is small even if the temperature of the hot water in the bathtub (bath temperature) is increased by chasing, etc. There was a problem that it took a long time to raise it.

Japanese Patent No. 5463114

  This invention is made | formed in view of the above situations, The subject which it is going to solve is providing the hot-water supply system which can shorten the time required to raise bathtub temperature to target temperature. .

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, a heat storage tank in which a heat medium is stored, and a heat pump that performs a heating operation for heating the heat medium in the heat storage tank to raise the temperature of the heat medium in the upper part of the heat storage tank A heating unit for performing a chasing operation for raising the temperature of the hot water in the bathtub to a target temperature by exchanging heat between the unit and the heat medium in the upper part of the heat accumulating tank and the hot water in the bathtub; A heat storage tank upper temperature detection means for detecting the temperature of the heat storage tank upper temperature indicating the temperature of the upper heat medium, and a control device for controlling the operation of the heat pump unit and the pursuit means. The first determination process is performed to determine whether or not a value obtained by subtracting the target temperature from the heat storage tank upper temperature is less than a first threshold, and the target temperature is determined from the heat storage tank upper temperature in the first determination process. The value minus If it is determined that the temperature is not less than the threshold value, the chasing means is operated to perform the chasing operation without performing the boiling operation, and the target temperature is subtracted from the heat storage tank upper temperature in the first determination process. When it is determined that the value is less than the first threshold value, the heat pump unit is operated to perform the boiling increase operation, and the tracking means is operated to perform the tracking operation. .

  In Claim 2, the said control apparatus determines with the value which pulled the said target temperature from the said thermal storage tank upper part temperature in the said 1st determination process being less than said 1st threshold value, and said 1st threshold value When it is determined that the temperature is not less than the second threshold value, the operation of the heat pump unit is controlled so that the heat storage tank upper temperature becomes the first temperature in the boiling increase operation, and in the first determination process, When it is determined that the value obtained by subtracting the target temperature from the heat storage tank upper temperature is less than the second threshold value, the second temperature in which the heat storage tank upper temperature is higher than the first temperature in the boiling operation. Thus, the operation of the heat pump unit is controlled.

  In Claim 3, The said heat medium is hot water, The hot water means which performs the hot water operation which supplies the hot water in the said thermal storage tank to the said bathtub, The bathtub temperature which shows the temperature of the hot water in the said bathtub Bath temperature detection means for detecting, and the control device performs a second determination process for determining whether or not a value obtained by subtracting the bathtub temperature from the target temperature exceeds a third threshold, When it is determined in the second determination process that the value obtained by subtracting the bathtub temperature from the target temperature does not exceed a third threshold, the tracking means is operated to perform the tracking operation, When it is determined that the value obtained by subtracting the bathtub temperature from the target temperature exceeds a third threshold value in the determination process, the chasing means and the chasing hot water operation are used in combination with the chasing hot water operation and the hot water bath operation. It is for operating the hot water means

  According to a fourth aspect of the present invention, the controller includes an accumulating unit that accumulates an operation history of the tracking unit, and the control device sets the current time at a predetermined time determined based on the operation history of the tracking unit. When this happens, the first determination process is performed.

  In Claim 5, it comprises the person detection part which detects the presence of the person in the bathroom where the bathtub is provided, and the control device detects the presence of the person in the bathroom. The first determination process is performed.

  As effects of the present invention, the following effects can be obtained.

  In Claim 1, the time required to raise the bath temperature to the target temperature can be shortened.

  In Claim 2, energy saving can be achieved, shortening the time required to raise bathtub temperature to target temperature.

  In Claim 3, the time required to raise the bath temperature to the target temperature can be shortened.

  According to the fourth aspect of the present invention, the reheating operation can be automatically performed.

  According to the fifth aspect of the present invention, the reheating operation can be automatically performed.

The schematic diagram which showed the whole structure of the hot water supply system which concerns on one Embodiment of this invention. The block diagram which showed the structure regarding control of a hot water supply system. The figure which shows the control flow of boiling increase and tracking. The figure which shows the control flow of the boiling increase and tracking which concern on 2nd embodiment. The block diagram which showed the structure regarding control of the hot water supply system which concerns on 3rd embodiment. The figure which shows the control flow of the boiling increase and tracking which concern on 3rd embodiment.

  Below, the structure of the hot water supply system 1 which concerns on 1st embodiment is demonstrated using FIG.1 and FIG.2.

  The hot water supply system 1 stores heat generated using a heat pump and supplies hot water boiled using the heat. The hot water supply system 1 is appropriately provided in a house or other building or facility. The hot water supply system 1 mainly includes a bathtub 10, a hot water storage tank 20, a heat pump unit 30, a hot water supply mechanism 40, a chasing mechanism 50, and a control device 60.

  The bathtub 10 is a tank for storing hot water for bathing. The bathtub 10 is provided in a bathroom.

  The hot water storage tank 20 stores heat through a heat medium stored inside. Specifically, the hot water tank 20 is filled with water (hot water) as a heat medium.

  The heat pump unit 30 consumes electric power and generates (manufactures) heat. The heat pump unit 30 mainly includes a first pipe 31, a compressor 32, a heat exchanger 33, an expansion valve 34, an evaporator 35, a fan 36, a second pipe 37 and a pump 38.

  The first pipe 31 forms a flow path for circulating a heat medium (refrigerant). The first piping 31 is formed in an annular shape. The first pipe 31 is filled with a heat medium (refrigerant).

  The compressor 32 consumes electric power and compresses the heat medium flowing through the first pipe 31. The compressor 32 is disposed in the middle of the first pipe 31.

  The heat exchanger 33 exchanges heat (thermal energy) between fluids having a temperature difference. The heat exchanger 33 is disposed in the middle of the first pipe 31. More specifically, the heat exchanger 33 is disposed on the downstream side of the compressor 32 in the flow direction of the heat medium flowing through the first pipe 31.

  The expansion valve 34 expands the heat medium flowing through the first pipe 31. The expansion valve 34 is disposed in the middle of the first pipe 31. More specifically, the expansion valve 34 is arranged on the downstream side of the heat exchanger 33 in the flow direction of the heat medium flowing through the first pipe 31.

  The evaporator 35 is a heat exchanger for evaporating the heat medium. The evaporator 35 is disposed in the middle of the first pipe 31. More specifically, the evaporator 35 is disposed on the downstream side of the expansion valve 34 in the flow direction of the heat medium flowing through the first pipe 31.

  The fan 36 is for sending wind (outside air) to the evaporator 35.

  The second pipe 37 forms a flow path for water to circulate between the heat exchanger 33 and the hot water tank 20. One end of the second pipe 37 is connected to the lower part of the hot water tank 20. A midway portion of the second pipe 37 is disposed so as to pass through the inside of the heat exchanger 33. The other end of the second pipe 37 is connected to the upper part of the hot water tank 20.

  The pump 38 circulates the water in the second pipe 37. The pump 38 is disposed in the middle of the second pipe 37. When the pump 38 is driven, the water in the second pipe 37 flows from one end (the lower side of the hot water tank 20) of the second pipe 37 toward the other end (the upper side of the hot water tank 20).

  The heat pump unit 30 configured in this way can perform a boiling increase operation. Specifically, in the heat pump unit 30, the heat medium compressed by the compressor 32 becomes a high-temperature gas. The high temperature heat medium flows through the heat exchanger 33 via the first pipe 31. The heat of the heat medium flowing through the heat exchanger 33 moves to the heat medium (water) flowing through the second pipe 37. Thereby, the temperature of the heat medium flowing through the heat exchanger 33 is lowered, and the heat medium becomes a liquid. The heat medium in the first pipe 31 that has circulated through the heat exchanger 33 expands in the expansion valve 34 to become a low-temperature liquid (or gas). The low-temperature heat medium flowing through the expansion valve 34 receives heat from the outside air in the evaporator 35, evaporates, and becomes gas again. The heat medium that has received heat from the outside air is supplied to the compressor 32 again.

  Moreover, the water which distribute | circulates the 2nd piping 37 receives the heat which generate | occur | produced in the heat pump unit 30 by passing the heat exchanger 33, and temperature rises. By returning the water whose temperature has risen to the hot water storage tank 20, the heat obtained by the heat pump unit 30 can be collected in the hot water storage tank 20. By performing the boiling increase operation in this way, the temperature of the water (hot water) stored in the hot water storage tank 20 can be raised.

  The hot water supply mechanism 40 supplies water (hot water) stored in the hot water storage tank 20 to the bathtub 10. The hot water supply mechanism 40 mainly includes a water injection pipe 41, a hot water supply pipe 42, and a mixing pipe 43.

  The water injection pipe 41 is a pipe that guides clean water to the hot water tank 20. One end of the water injection pipe 41 is connected to the lower part of the hot water tank 20.

  The hot water supply pipe 42 is a pipe that takes out water (hot water) stored in the upper part of the hot water storage tank 20 and supplies it to the bathtub 10. One end of the hot water supply pipe 42 is connected to the upper part of the hot water storage tank 20. The other end of the hot water supply pipe 42 is connected to the bathtub 10.

  The mixing pipe 43 is a pipe for mixing clean water with water (hot water) flowing through the hot water supply pipe 42. One end of the mixing pipe 43 is connected to a midway portion of the water injection pipe 41. The other end of the mixing pipe 43 is connected to the middle part of the hot water supply pipe 42.

  In the hot water supply mechanism 40 configured as described above, a setting panel (not shown) for a user (a bather) to operate is installed in the bathroom in which the bathtub 10 is provided. When an automatic hot water button provided on the setting panel is pressed, a pump (not shown) is driven, and hot water (hot water) taken out from the hot water storage tank 20 via the hot water supply pipe 42 is supplied via the mixing pipe 43. The supplied water is mixed. Thus, the water (hot water) of the temperature according to a request | requirement can be obtained by mixing the hot water (high temperature water) and hot water from the hot water storage tank 20 suitably. The water (hot water) thus mixed is supplied to the bathtub 10 via the hot water supply pipe 42. In this case, water (hot water) stored in the hot water storage tank 20 is taken out via the hot water supply pipe 42, and clean water is supplied to the hot water storage tank 20 through the water injection pipe 41. In this way, the hot water tank 20 is always filled with water (hot water).

  Moreover, the hot water supply mechanism 40 can perform the hot water operation. Specifically, the hot water (high temperature water) taken out from the hot water storage tank 20 through the hot water supply pipe 42 is appropriately mixed with clean water supplied through the mixing pipe 43 so that the temperature (required) is met. Water (hot water) having a boiling temperature) can be obtained. The water (hot water) thus mixed is supplied to the bathtub 10 via the hot water supply pipe 42. In this way, hot water can be added to the bathtub 10. In this case, water (hot water) stored in the hot water storage tank 20 is taken out through the hot water supply pipe 42 and hot water is supplied to the hot water storage tank 20 through the water injection pipe 41 in the same manner as in hot water filling. In this way, the hot water tank 20 is always filled with water (hot water).

  The chasing mechanism 50 chases water (hot water) in the bathtub 10. The chasing mechanism 50 includes a hot water tank side chasing pipe 51, a heat exchanger 52, and a bathtub side chasing pipe 53.

  The hot water tank side follow-up piping 51 forms a flow path for circulating hot water in the hot water tank 20. One end of the hot water tank side tracking pipe 51 is connected to the upper part of the hot water tank 20. The other end of the hot water storage tank side tracking pipe 51 is connected to the upper and lower halfway part in the hot water storage tank 20.

  The heat exchanger 52 exchanges heat (thermal energy) between fluids having a temperature difference. The heat exchanger 52 is disposed in the middle of the hot water tank side tracking pipe 51.

  The bathtub side tracking pipe 53 forms a flow path for circulating water (hot water) in the bathtub 10. One end of the bathtub side tracking pipe 53 is connected to the bathtub 10. A midway portion of the bathtub side tracking pipe 53 is arranged so as to pass through the inside of the heat exchanger 52. The other end of the bathtub side tracking pipe 53 is connected to the bathtub 10.

  The setting panel installed in the bathroom has a tracking button. When the chasing button is pressed, chasing operation by the chasing mechanism 50 is performed. Specifically, a pump (not shown) of the chasing mechanism 50 is driven, and hot water (high temperature water) in the hot water tank 20 flows through the hot water tank side chasing pipe 51 through the heat exchanger 52. Moreover, the water (hot water) in the bathtub 10 flows through the inside of the heat exchanger 52 via the bathtub-side tracking pipe 53. By the heat exchanger 52, the heat of hot water (hot water) flowing through the hot water tank side follower pipe 51 moves to water (hot water) flowing through the bathtub side follower pipe 53. Thereby, the water (hot water) which distribute | circulates the bathtub side tracking piping 53 is warmed. The hot water thus heated returns to the bathtub 10, whereby the temperature of the water (hot water) in the bathtub 10 can be raised.

  A control device 60 shown in FIG. 2 controls the operation of the hot water supply system 1. The control device 60 is mainly composed of an arithmetic processing device such as a CPU, a storage device such as a RAM and a ROM, an input / output device such as an I / O, and a display device such as a monitor. The control device 60 stores in advance various information, programs, and the like for controlling the operation of the hot water supply system 1. The control device 60 is connected to the upper temperature sensor 61, the lower temperature sensor 62, the incoming water temperature sensor 63, the flow rate sensor 64 and the bathtub temperature sensor 65.

  The upper temperature sensor 61 detects the temperature of water (hot water) stored in the upper part of the hot water tank 20. The upper temperature sensor 61 is disposed in the upper part of the hot water tank 20.

  The lower temperature sensor 62 detects the temperature of water (low temperature water) stored in the lower part of the hot water tank 20. The lower temperature sensor 62 is disposed in the lower part of the hot water tank 20.

  The incoming water temperature sensor 63 detects the temperature of water supplied from the lower part of the hot water tank 20 to the heat exchanger 33 of the heat pump unit 30 via the second pipe 37. The incoming water temperature sensor 63 is arranged in the middle of the second pipe 37 (upstream side of the heat exchanger 33).

  The flow rate sensor 64 detects the flow rate of water (hot water) flowing through the hot water supply pipe 42. The flow sensor 64 is disposed in the middle of the hot water supply pipe 42. More specifically, the flow rate sensor 64 is disposed on the downstream side of the connecting portion between the hot water supply pipe 42 and the mixing pipe 43 in the flow direction of water (hot water) flowing through the hot water supply pipe 42.

  The bathtub temperature sensor 65 detects the temperature of water (hot water) flowing through the bathtub side tracking pipe 53. The bathtub temperature sensor 65 is disposed in the middle of the bathtub side tracking pipe 53. Thereby, the bathtub temperature sensor 65 detects the temperature of the water (hot water) drained from the bathtub 10.

  The control device 60 is connected to the heat pump unit 30 (the compressor 32 or the like) and can control the operation of the heat pump unit 30. Specifically, the control device 60 can operate (run) or stop the heat pump unit 30.

  Further, the control device 60 controls a target value of the temperature of water obtained by operating the heat pump unit 30 (specifically, water that is warmed by the heat exchanger 33 by flowing through the second pipe 37). be able to.

  Further, the control device 60 is connected to the hot water supply mechanism 40 (a pump or the like of the hot water supply mechanism 40), and can control the operation of the hot water supply mechanism 40. Specifically, the control device 60 can operate (run) or stop the hot water supply mechanism 40.

  Further, the control device 60 can control the amount of hot water applied to the bathtub 10 (hot water amount) and the amount of hot water (taste water amount). The said control is performed based on the detection result of the flow volume of the hot water which distribute | circulates the hot water supply piping 42 by the flow sensor 64. FIG. When the flow rate detected by the flow rate sensor 64 reaches the set amount of hot water, the control device 60 stops hot water supply to the bathtub 10.

  The control device 60 is connected to the tracking mechanism 50 (such as a pump of the tracking mechanism 50) and can control the operation of the tracking mechanism 50. Specifically, the control device 60 can operate (run) or stop the tracking mechanism 50.

  Next, control related to the heating operation and the follow-up operation will be described with reference to FIG. In the following description, it is assumed that the automatic hot water button has already been pressed and hot water is being applied to the bathtub 10.

  In step S10, the control device 60 determines whether or not the tracking button on the setting panel has been pressed. The control device 60 makes this determination based on whether or not a signal from the tracking button has been received. When it is determined that the tracking button has been pressed (“YES” in step S10), the control device 60 proceeds to step S12. On the other hand, when it is determined that the tracking button has not been pressed (“NO” in step S10), the control device 60 returns the process to the first step.

In step S12, the control unit 60 detects the target temperature _{T 1.} The target temperature T _1, which shows a bath temperature desired by the user (temperature of hot water in the bathtub 10). That is, the target temperatures T ₁ is the temperature indicating it wants to warm up to which temperature the hot water of the bathtub 10 by the user follow fired like. Target temperatures T ₁ is set by operating the setting panel by the user. The target temperatures T _1, when the user does not set is set to a predetermined value (e.g., 40 ° C.). After performing the process of step S12, the control device 60 proceeds to step S14.

In step S14, the controller 60 detects the hot water storage tank upper temperature _{T 2.} The hot water tank upper temperature T _2, which shows the temperature of the top of the hot water in the hot water storage tank 20 (i.e., the hot water supplied from the hot water storage tank 20 to the hot water supply pipe 42). The control device 60 can detect the hot water tank upper temperature T ₂ via the upper temperature sensor 61. After performing the process of step S14, the control device 60 proceeds to step S16.

In step S16, the control unit 60, the values from the hot water tank the upper temperature T ₂ by subtracting the target temperature T ₁ is, whether it is less than a predetermined threshold value [alpha] 1, i.e. [the hot water storage tank upper temperature T ₂ - target temperatures T ₁ It is determined whether or not <α1]. In the present embodiment, the threshold value α1 is set to 15 ° C. If it is determined that [the hot water tank upper temperature T ₂ −the target temperature T ₁ <α1] (“YES” in step S16), the control device 60 proceeds to step S18. On the other hand, if it is determined that [hot water storage tank upper temperature T ₂ −target temperature T ₁ <α1] is not satisfied (“NO” in step S16), control device 60 proceeds to step S24.

When [the hot water storage tank upper temperature T ₂ −target temperature T ₁ <α1] (“YES” in step S16), the current hot water storage tank upper temperature T ₂ is relatively low, so the current hot water storage tank when performing chase fired operating at the upper temperature T _2, shows that the bath temperature is time to reach the target temperature T ₁ is too long, or may not reach the target temperatures T _1. On the other hand, when it is not [hot water tank upper temperature T ₂ −target temperature T ₁ <α1] (“NO” in step S16), the current hot water tank upper temperature T ₂ is relatively high and the current hot water tank upper temperature T when performing chase fired operated at _2, bath temperature indicating that to reach the target temperature T ₁ of a relatively short time. In other words, the threshold value α1, the bath temperature is set in consideration of the time required to reach the target temperature T ₁ of the chase fired operation.

In step S18, the control unit 60, a value obtained by subtracting the target temperature _{T 1} of the hot water tank the upper temperature _{T 2} is either less than a predetermined threshold value [alpha] 2, that is, [the hot water storage tank upper temperature _{T 2} - target temperatures _T 1 < [alpha] 2]. Here, the threshold value α2 is set to a value smaller than the threshold value α1 used in the determination in step S16. In the present embodiment, the threshold value α2 is set to 10 ° C. When it is determined that [the hot water tank upper temperature T ₂ −the target temperature T ₁ <α2] is not satisfied (“NO” in step S18), the control device 60 proceeds to step S20. On the other hand, when it is determined that [the hot water tank upper temperature T ₂ −target temperature T ₁ <α2] (“YES” in step S18), the control device 60 proceeds to step S22.

In the case of [hot water tank upper temperature T ₂ −target temperature T ₁ <α2] (“YES” in step S18), it is assumed that the normal boiling-up operation and the follow-up operation in step S20 described later are performed. also shows that the bath temperature is time to reach the target temperature T ₁ is too long, or may not reach the target temperatures T _1. On the other hand, the case where [the hot water tank upper temperature T ₂ −the target temperature T ₁ <α2] is not satisfied (“NO” in step S18) is a case where the chasing operation is performed together with the normal boiling operation in step S20 described later. bath temperature indicating that to reach the target temperature T ₁ of at target short time.

In step S20, the control device 60 controls the operation of the heat pump unit 30 so as to perform the normal boiling operation. Specifically, the control unit 60 controls the operation of the heat pump unit 30 so that the hot water storage tank upper temperature T ₂ becomes the first temperature T _2a. The first temperature T _2a is set to 55 ° C., for example. After performing the process of step S20, the control device 60 proceeds to step S24.

On the other hand, in step S22, the control device 60 controls the operation of the heat pump unit 30 so as to perform the high temperature boiling operation. Specifically, the control unit 60 controls the operation of the heat pump unit 30 so that the hot water storage tank upper temperature T ₂ becomes the second temperature T _2b. Here, the second temperature _T2b is set to a temperature higher than the first temperature _T2a . The second temperature T _2b is set to 65 ° C., for example. After performing the process of step S22, the control device 60 proceeds to step S24.

Thus the temperature difference between the hot water storage tank upper temperature T ₂ and the target temperature T ₁ is relatively small - in the case (the hot water storage tank upper temperature T ₂ is the target temperatures T _{1 <[alpha]} 1), by performing the additional boiling operation, it is possible to increase the hot water tank upper temperature T _2, it is possible to shorten this by the time it takes to reach the bath temperature to the target temperature T ₁ of the chase fired operation (target temperature reaching time). Furthermore, when the temperature difference between the hot water tank upper temperature T ₂ and the target temperature T ₁ is very small (hot water tank upper temperature T ₂ −target temperature T ₁ <α2), the hot water tank upper temperature T ₂ is increased ( By setting the temperature to 65 ° C., it is possible to shorten the target temperature arrival time by the follow-up operation. In addition, the return hot water of the hot water tank 20 used for the chasing operation (hot water returning from the upper part of the hot water tank 20 to the middle part of the hot water tank 20 through the hot water tank side purging pipe 51) may be set to a relatively high temperature. because it, by stirring and return water can be prevented from that hot water tank upper temperature T ₂ significantly reduced.

In step S24, the control unit 60 detects the current bath temperature _{T 3.} The current bath temperature T _3, shows the current temperature of the hot water in the bathtub 10. The controller 60 performs the operation fumbling for sensing current bath temperature T _3.

Specifically, the control device 60 drives (not shown) a pump (not shown) to distribute (circulate) the hot water in the bathtub 10 to the bathtub-side tracking pipe 53. Then, the control unit 60, by detecting the temperature of the water (hot water) that circulates in the fired pipe 53 follow tub side by bath temperature sensor 65 can detect the current bath temperature T _3. The water (hot water) flowing through the bathtub side tracking pipe 53 flows through the bathtub side tracking pipe 53 as it is and is returned to the bathtub 10. Also, the search operation, since it is the purpose of detecting the current bath temperature T _3, are carried out in a very short time. The control device 60 proceeds to step S26 after performing the process of step S24.

In step S26, the control unit 60, a value obtained by subtracting the current bath temperature _{T 3} from the target temperature _{T 1} is either exceeds a predetermined threshold value beta, that is, [the target temperatures _{T 1} - current bath temperature _{T 3>} beta] It is determined whether or not. In the present embodiment, the threshold value β is set to 5 ° C. When it is determined that [target temperature T ₁ −current bath temperature T ₃ > β] is not satisfied (“NO” in step S26), control device 60 proceeds to step S28. On the other hand, when it is determined that [target temperature T ₁ −current bath temperature T ₃ > β] (“YES” in step S26), control device 60 proceeds to step S30.

In the case of [target temperature T ₁ −current bath temperature T ₃ > β] (“YES” in step S26), it takes time until the bath temperature reaches the target temperature T ₁ only in the follow-up operation. Indicates too much. This is the follow-fired operation only (if plus not use the hot water), by stirring the return water is because the hot water storage tank upper temperature T ₂ significantly reduced. On the other hand, when it is not [target temperature T ₁ −current bath temperature T ₃ > β] (“NO” in step S26), it is a relatively short time even in the case of only the follow-up operation (when no hot water is used in combination). in indicates that bath temperature reaches the target temperature T _1.

In step S28, the control device 60 controls the operation of the tracking mechanism 50 so as to perform the tracking operation. The controller 60, as bath temperature reaches the target temperature T _1, performing the fired operation follow through the chase fired mechanism 50. When the process of step S28 is finished, the control shown in FIG. 3 is finished.

On the other hand, in step S30, the control device 60 controls operations of the hot water supply mechanism 40 and the chasing mechanism 50 so as to perform the chasing hot water combined chasing operation. The controller 60, as bath temperature reaches the target temperature T _1, performing the hot water operation fired operation and plus follow through the chase fired mechanism 50 and hot water supply mechanism 40. Specifically, the control unit 60 performs a first hot water operation Tashi and the hot water supply mechanism 40 is operated, when the bath temperature in the hot water operation plus did not reach the target temperature T _1, the chase fired mechanism 50 is operated performing fired operation follow up bath temperature reaches the target temperature T ₁ of in. When the process of step S30 is finished, the control shown in FIG. 3 is finished.

Incidentally, when the bath temperature reaches the target temperature T ₁ of the the process of step S28 or S30, the control unit 60, even without reheating operation (step S20 or S22) is completed, and terminates the reheating operation .

  In the hot water supply system 1 according to the present embodiment configured as described above, since the reheating operation is performed as necessary during the follow-up operation, the hot water storage tank 20 is compared with the case where the reheating is performed at midnight power. It is possible to lower the hot water storage temperature (low temperature hot water storage). Thereby, COP can be improved and the fall of hot water storage loss can be suppressed.

Further, to determine the temperature difference between the hot water storage tank upper temperature T ₂ and the target temperature T _1, since the operation increased boiling when the temperature difference is small, it is possible to shorten the Atsushi Nobori time of the bath temperature.

Further, the temperature difference is very hot water storage tank upper temperature T ₂ and the target temperature T ₁ (e.g., to the extent that it is impossible to bring the bath temperature to the target temperature T ₁₎ is smaller is subjected to a high-temperature reheating since the high temperature of the hot water storage tank upper temperature T _2, it is possible to shorten the Atsushi Nobori time of the bath temperature. Moreover, since the return hot water to the hot water storage tank 20 can be made high temperature, the fall of the hot water storage tank upper part temperature by stirring with a return hot water can be suppressed. Further, high-temperature boiling is performed only when necessary (normal boiling-up operation is not performed when high-temperature boiling is sufficient), so energy saving can be achieved.

Further, when the temperature difference between the target temperature T ₁ of the current bath temperature T ₃ is large, the combination hot water operation plus the time of follow-fired operation, it is possible to reduce the return water to the hot water storage tank 20. Thus, it is possible to suppress the reduction of the hot water storage tank upper temperature T ₂ by the agitation of the hot water return and the top of the hot water of the hot water storage tank 20. For this reason, the temperature rising time of bathtub temperature can be shortened.

As described above, the hot water supply system 1 according to the present embodiment includes a hot water storage tank 20 (heat storage tank) in which a heat medium is stored, and an upper part of the hot water storage tank 20 by heating the heat medium in the hot water storage tank 20. The heat pump unit 30 that performs the boiling operation that raises the temperature of the heat medium and the heat medium in the upper portion of the hot water storage tank 20 and the hot water in the bathtub 10 are subjected to heat exchange, so that the hot water in the bathtub 10 is heated to the target temperature. T until ₁ performs additionally embrace operation for heating additionally embrace mechanism 50 (the follow-fired unit) detecting the hot water tank the hot water tank upper temperature T ₂ shows the temperature of the top of the heat medium in the 20 _(heat storage tank top temperature) An upper temperature sensor 61 (heat storage tank upper temperature detection means), and a control device 60 for controlling the operation of the heat pump unit 30 and the follow-up mechanism 50. The control device 60 has an upper temperature of the hot water tank. before from T ₂ Serial minus the target temperature T ₁ of the value performs the first determination process determines whether less than a first threshold value [alpha] 1, the from the hot water tank upper temperature T ₂ in the first determination processing target temperatures T ₁ When it is determined that the value obtained by subtracting is not less than the first threshold value α1, the chasing mechanism 50 is operated so as to perform the chasing operation without performing the boiling increase operation, and in the first determination process, If the value obtained by subtracting the target temperature T ₁ of the hot water tank the upper temperature T ₂ is determined to be less than said first threshold value [alpha] 1, with operating the heat pump unit 30 to perform the additional boiling operation, the add The follow-up mechanism 50 is operated so as to perform the idling operation.
With this configuration, it is possible to shorten the time required to raise the bath temperature to the target temperature T _1.

Further, the control device 60, the value obtained by subtracting the target temperature T ₁ of from the hot water tank upper temperature T ₂ in the first determination process determines that the a first less than a threshold value [alpha] 1, and the first If it is determined not to be smaller than the second threshold value α2 than the threshold α1 of, in the reheating operation, the hot water storage tank upper temperature T ₂ is controlling the operation of the heat pump unit 30 such that the first temperature T _2a and, if the value obtained by subtracting the target temperature T ₁ of from the hot water tank upper temperature T ₂ in the first determination process is determined to be less than said second threshold value [alpha] 2, in the reheating operation, the hot water tank top and it controls the operation of the heat pump unit 30 as temperature T ₂ is higher than said first temperature T _2a second temperature T _2b.
With such a configuration, while reducing the time required to raise the bath temperature to the target temperature T _1, it is possible to achieve energy saving.

Further, the heat medium is hot water, and a hot water supply mechanism 40 (tashi hot water means) for performing hot water operation for supplying hot water in the hot water storage tank 20 to the bathtub 10, and the temperature of the hot water in the bathtub 10. A bath temperature sensor 65 (tub temperature detecting means) that detects a current bath temperature T ₃ (tub temperature), and the control device 60 subtracts the current bath temperature T ₃ from the target temperature T _1. value is performed a second determination process of determining whether it exceeds a third threshold value beta, the value obtained by subtracting the current bath temperature T ₃ from the target temperatures T ₁ in the second determination process is a third If it is determined not to exceed the threshold value beta, the chase fired by operating the chase fired mechanism 50 to perform the operation, the second determination processing wherein current bath temperature T ₃ to a value obtained by subtracting from the target temperature T ₁ of the Is determined to exceed the third threshold β , It was said and said follow-fired operation is intended to operate the chase fired mechanism 50 and the hot water supply mechanism 40 so as to combination of a hot water operation.
With this configuration, it is possible to shorten the time required to raise the bath temperature to the target temperature T _1.

In addition, the hot water storage tank 20 which concerns on this embodiment is one Embodiment of the heat storage tank.
Moreover, the hot water supply mechanism 40 according to the present embodiment is an embodiment of the hot water means.
The tracking mechanism 50 according to the present embodiment is an embodiment of the tracking means.
Moreover, the upper temperature sensor 61 which concerns on this embodiment is one Embodiment of a thermal storage tank upper temperature detection means.
Moreover, the bathtub temperature sensor 65 which concerns on this embodiment is one Embodiment of the bathtub temperature detection means.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said structure, A various change is possible within the range of the invention described in the claim.

  For example, in this embodiment, the determination as to whether or not to perform additional heating is performed when the follow-up button is pressed, but is not limited to this, and any information is used as a trigger. It may be performed. In the following, an example will be described in which it is determined whether or not to perform additional driving using information other than the push-down button being pressed.

  Next, the hot water supply system 1 which concerns on 2nd embodiment of this invention is demonstrated.

  In the second embodiment, the control device 60 accumulates an operation history of the tracking mechanism 50 in the storage device of the control device 60. For example, the control device 60 accumulates a history such as the start time of the follow-up operation.

  Next, with reference to FIG. 4, a description will be given of the control related to the boiling increase operation and the follow-up operation according to the second embodiment of the present invention.

  In step S11a, the control device 60 determines whether or not the current time has reached the start time. Here, the “boiling start time” is a time at which the heating operation is started, and is determined based on the history of the operation of the tracking means accumulated in the control device 60. Specifically, the control device 60 calculates a time (predicted start time) at which the chasing operation is predicted to be started (performed) from the history of the chasing unit operation. Then, the control device 60 sets the boiling start time at the prediction start time or a time slightly before the prediction start time. When it is determined that the current time has reached the start time ("YES" in step S11a), the control device 60 proceeds to step S12. On the other hand, when it is determined that the current time has not reached the start time (“NO” in step S11a), the control device 60 returns the process to the first step.

  The processing from step S12 to step S22 is the same as the processing of the first embodiment shown in FIG. After performing the process of step S20, the control device 60 proceeds to step S23. Moreover, after performing the process of step S22, the control device 60 proceeds to step S23.

  In step S23, the control device 60 determines whether or not the tracking button on the setting panel has been pressed. The control device 60 makes this determination based on whether or not a signal from the tracking button has been received. When it is determined that the tracking button has been pressed (“YES” in step S23), the control device 60 proceeds to step S24. On the other hand, when it is determined that the tracking button has not been pressed (“NO” in step S23), the control device 60 returns the process to step S23 again (the process cannot proceed further).

  The processing from step S24 to step S30 is the same as the processing of the first embodiment shown in FIG.

As described above, in the hot water supply system 1 according to the second embodiment, it is possible to automatically perform the boiling increase operation according to the time when the follow-up operation is predicted to start. Therefore, before the follow-up operation, it is possible to increase the temperature of the hot water storage tank T ₂ by performing the re-boost operation, so that the temperature of the bath temperature is increased compared with the case where the increase in boiling and the follow-up are performed substantially simultaneously. Time (target temperature arrival time) can be further shortened.

As described above, the hot water supply system 1 according to the second embodiment includes the accumulation unit (control device 60) that accumulates the operation history of the tracking mechanism 50, and the control device 60 indicates that the current time is the additional time. The first determination process is performed when the heating start time (predetermined time) determined based on the operation history of the firing mechanism 50 is reached.
By configuring in this way, it is possible to automatically carry out the boiling operation.

  The second embodiment of the present invention has been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention described in the claims.

  For example, in the second embodiment, the chasing operation is performed when the chasing button is pressed. However, even if the chasing button is not depressed, it is automatically triggered when the boiling start time is reached. It is also possible to perform chasing driving.

  Next, the outline | summary of the structure regarding control of the hot water supply system 1 which concerns on 3rd embodiment of this invention is demonstrated using FIG.

  The third embodiment is different from the first embodiment in that a human sensor 66 is provided. Therefore, below, about the structure same as 1st embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The human sensor 66 detects the presence of a person in the bathroom. The human sensor 66 is installed at an appropriate place in the bathroom. The human sensor 66 is connected to the control device 60.

  Next, with reference to FIG. 6, a description will be given of the control related to the boiling increase operation and the follow-up operation according to the third embodiment of the present invention.

  In step S11b, the control device 60 determines whether a person is present in the bathroom. The control device 60 makes this determination based on the detection result of the human sensor 66. When it is determined that there is a person in the bathroom (“YES” in step S11b), the control device 60 proceeds to step S12. On the other hand, when it is determined that there is no person in the bathroom (“NO” in step S11b), the control device 60 returns the process to the first step.

  The processing from step S12 to step S30 is the same as the processing of the second embodiment shown in FIG.

As described above, in the hot water supply system 1 according to the third embodiment, when the presence of a person in the bathroom is detected, the heating operation can be automatically performed. Therefore, before the follow-up operation, it is possible to increase the temperature of the hot water storage tank T ₂ by performing the re-boost operation, so that the temperature of the bath temperature is increased compared with the case where the increase in boiling and the follow-up are performed substantially simultaneously. Time (target temperature arrival time) can be further shortened.

As described above, the hot water supply system 1 according to the third embodiment includes the human sensor 66 (person detection unit) that detects the presence of a person in the bathroom in which the bathtub 10 is provided, and the control device 60 includes: When the human sensor 66 detects the presence of a person in the bathroom, the first determination process is performed.
By configuring in this way, it is possible to automatically carry out the boiling operation.

  The third embodiment of the present invention has been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention described in the claims.

  For example, in the third embodiment, the chasing operation is performed when the chasing button is pressed. However, even if the chasing button is not depressed, the detection of the presence of a person in the bathroom is automatically triggered. It is also possible to perform chasing driving.

  Further, the first embodiment to the third embodiment can be performed simultaneously. That is, pressing of the chasing button (step S10 shown in FIG. 3), detection of reaching the start time of heating (step S11a shown in FIG. 4), and detection of the presence of a person in the bathroom (step shown in FIG. 6) All of S11b) can also be used as a trigger for starting the reheating operation.

DESCRIPTION OF SYMBOLS 1 Hot-water supply system 10 Bathtub 20 Hot water storage tank 30 Heat pump unit 40 Hot-water supply mechanism 50 Tracking mechanism 60 Control apparatus 61 Upper part temperature sensor 65 Bathtub temperature sensor 66 Human sensor

Claims (5)

A heat storage tank in which a heat medium is stored;
A heat pump unit that performs a reheating operation for heating the heat medium in the heat storage tank and raising the temperature of the upper heat medium in the heat storage tank;
A follow-up means for performing a follow-up operation for raising the temperature of the hot water in the bathtub to a target temperature by exchanging heat between the heat medium in the upper part of the heat storage tank and the hot water in the bathtub,
A heat storage tank upper temperature detection means for detecting a heat storage tank upper temperature indicating a temperature of an upper heat medium in the heat storage tank;
A control device for controlling the operation of the heat pump unit and the pursuit means;
Comprising
The control device includes:
Performing a first determination process for determining whether or not a value obtained by subtracting the target temperature from the heat storage tank upper temperature is less than a first threshold;
In the first determination process, when it is determined that the value obtained by subtracting the target temperature from the heat storage tank upper temperature is not less than a first threshold value, the additional operation is performed so that the follow-up operation is performed without performing the additional heating operation. Operate Idaki means,
When it is determined that the value obtained by subtracting the target temperature from the heat storage tank upper temperature in the first determination process is less than the first threshold, the heat pump unit is operated to perform the boiling operation, and Actuating the chasing means to perform chasing driving;
Hot water system. The control device includes:
In the first determination process, a value obtained by subtracting the target temperature from the heat storage tank upper temperature is determined to be less than the first threshold, and is determined not to be less than a second threshold smaller than the first threshold. In this case, in the boiling increase operation, the operation of the heat pump unit is controlled so that the upper temperature of the heat storage tank becomes the first temperature,
In the first determination process, when it is determined that a value obtained by subtracting the target temperature from the heat storage tank upper temperature is less than the second threshold value, in the boiling operation, the heat storage tank upper temperature is the first temperature. Controlling the operation of the heat pump unit to be a second temperature higher than
The hot water supply system according to claim 1. The heat medium is hot water,
A hot water means for performing hot water operation to supply hot water in the heat storage tank to the bathtub;
A bath temperature detecting means for detecting a bath temperature indicating the temperature of hot water in the bath,
Comprising
The control device includes:
Performing a second determination process for determining whether or not a value obtained by subtracting the bathtub temperature from the target temperature exceeds a third threshold;
When it is determined that the value obtained by subtracting the bathtub temperature from the target temperature in the second determination process does not exceed the third threshold value, the tracking means is operated to perform the tracking operation,
In the second determination process, when it is determined that a value obtained by subtracting the bathtub temperature from the target temperature exceeds a third threshold value, the chasing operation is performed so that the chasing operation and the hot water operation are used in combination. Operating the means and the hot water means,
The hot water supply system according to claim 1 or claim 2. An accumulating unit for accumulating an operation history of the pursuit means;
The control device includes:
When the current time is a predetermined time determined based on the history of operation of the tracking unit, the first determination process is performed.
The hot water supply system according to any one of claims 1 to 3. Comprising a human detection unit for detecting the presence of a person in the bathroom provided with the bathtub,
The control device includes:
When the person detection unit detects the presence of a person in the bathroom, the first determination process is performed.
The hot water supply system according to any one of claims 1 to 4.

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