JP2012220034A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent run-out of hot water while reducing time required for increasing a temperature of bathtub water up to a set temperature when performing a hot water supply operation from a state with hot water in a bathtub.SOLUTION: A storage type water heater 1 can perform a boiling-up operation, a hot water supply operation for supplying hot water of a set temperature and a set amount in a bathtub 2, and a reheating operation in which a bath circulation heat source pump 20 installed on the way of a tank circulation circuit 18 is operated and hot water in a hot water storage tank 4 and hot water in a bathtub 2 are subjected to mutual heat exchange. When performing a hot water supply operation with water, the reheating operation is performed for heating bathtub water and then hot water in the hot water storage tank 4 is supplied to the bathtub 2 until hot water in the bathtub 2 reaches a set temperature and a set amount. When the storage of heat in the hot water storage tank 4 is larger than a predetermined amount at the time of the reheating operation, the pump 20 is controlled at a predetermined rotation speed for the reheating operation. When the storage of heat is equal to or smaller than a predetermined amount, the pump 20 is controlled at a rotation speed lower than the predetermined rotation speed for the boiling-up operation as well as reheating operation.

Description

  The present invention relates to a hot water storage type water heater, and more particularly to a heat pump type hot water storage type water heater.

  2. Description of the Related Art Conventionally, a hot water storage tank and a heat exchanger are provided, and the temperature of the bathtub water is raised by a reheating operation for exchanging heat between the hot water in the hot water storage tank and the bathtub water (see, for example, Patent Document 1). Specifically, in this device, when the hot water temperature of the hot water tank is higher than a preset temperature, the hot water of the hot water tank and the bathtub water are heat-exchanged to replenish the bathtub water with high capacity. In the case of an intermediate temperature lower than the set temperature, the hot water in the upper part of the hot water tank is discharged into a bathtub (so-called high temperature hot water) and reheating is performed.

JP 2003-161522 A

  The conventional hot water heater as described above raises the temperature of hot water in the bathtub by the combined use of the hot water supply to the bathtub and the chasing operation. However, the conventional apparatus does not consider the amount of heat stored in the hot water storage tank. For this reason, in the filling operation from the state in which there is remaining hot water in the bathtub, when performing the filling operation with the reheating operation by heat exchange, it may take a long time to raise the temperature of the bathtub water. In addition, when the amount of remaining hot water in the tank is small, there is a risk of running out of hot water.

  The present invention has been made to solve the above-described problems, and in hot water operation from a state in which there is hot water in the bathtub, while reducing the time for raising the temperature of the bathtub water to the set temperature, An object of the present invention is to provide an easy-to-use hot water storage type water heater that can prevent cutting.

  The hot water storage type hot water supply apparatus according to the present invention includes a boiling operation for heating hot water in a hot water storage tank using a heating means, a hot water operation for stretching a set hot water temperature and a set amount of hot water in a bathtub, and one end of the hot water storage tank. Is connected to the upper part of the tank, a heat exchanger is installed in the middle, and the other end is connected to the lower part of the hot water tank. A hot water storage water heater that has a circulation heat source pump that circulates the hot and cold water, and that can perform a reheating operation for exchanging heat between the hot water in the hot water storage tank and the hot water in the bathtub by operating the circulation heat source pump When the hot water operation is performed from a state where bathtub water having a temperature lower than the set hot water temperature is stored in the bathtub, the additional operation means for heating the bathtub water by the additional operation, and the additional operation Hot water in the bathtub after performing the means Hot water filling means for supplying hot water in the hot water storage tank into the bathtub until the hot water temperature reaches the set hot water temperature and the set hot water amount, and the reheating operation means is a heat storage amount acquiring means for acquiring the heat storage amount in the hot water storage tank. When the heat storage amount is larger than the predetermined amount, a first reheating operation is performed in which the circulation heat source pump is controlled to a predetermined number of revolutions to perform reheating, and when the heat storage amount is less than the predetermined amount, the circulation heat source pump is turned on. Control means for performing a second chasing operation for performing a boiling operation at the same time as performing chasing by controlling the number of revolutions to be lower than a predetermined number of revolutions.

  According to the present invention, in a hot water operation from a state in which bathtub water remains, a hot water storage type hot water heater that is easy to use by preventing hot water shortage while shortening the time for raising the bathtub water to a set temperature. Can be provided.

It is a figure for demonstrating the structure of the hot water storage type water heater 1 in Embodiment 1 of this invention. It is a flowchart which shows the routine performed in Embodiment 1 of this invention. It is a flowchart which shows the routine performed in Embodiment 2 of this invention. It is a flowchart which shows the routine performed in Embodiment 3 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a diagram for explaining a configuration of a hot water storage type hot water heater 1 according to Embodiment 1 of the present invention. A hot water storage type water heater 1 shown in FIG. 1 includes a hot water storage tank 4 that stores hot water supplied to a bathtub 2 and a faucet, and a heat pump unit 5 that is heating means for heating (boiling) hot water in the hot water storage tank 4. It has.

  The hot water storage type hot water heater 1 includes a heating circulation circuit 6 for boiling water in the hot water storage tank 4 using a water refrigerant heat exchanger (not shown) of the heat pump unit 5. The heating circuit 6 is connected to the upper and lower portions of the hot water storage tank 4. The heating circulation circuit 6 includes a circulation pump (not shown) for circulating water in the hot water storage tank 4 through the heating circulation circuit 6 in the heat pump unit 5. With such a configuration, the water taken out from the lower part of the hot water storage tank 4 is boiled up to high temperature hot water by exchanging heat with the outside air through the refrigerant in the heat pump unit 5, and then placed in the upper part of the hot water storage tank 4. It is supposed to be returned.

  The remaining hot water thermistor 30a, the remaining hot water thermistor 30b, the remaining hot water thermistor 30c, and the remaining hot water thermistor 30c are provided on the outer peripheral side surface of the hot water storage tank 4 at predetermined intervals in the longitudinal direction of the hot water storage tank 4. A hot water thermistor 30d is provided. These remaining hot water thermistors 30a to 30d have positions (heights) at which the tank internal volume from the upper part of the hot water storage tank 4 becomes a predetermined amount (in this embodiment, 0L, 50L, 100L, 150L). In order to detect the amount of remaining hot water in the tank, the temperature in the hot water storage tank 4 at that position is output.

  Moreover, the hot water storage type water heater 1 includes a water supply pipe 10 connected to a water source such as a water pipe. The water flowing in the water supply pipe 10 is depressurized by the pressure reducing valve 11 and then supplied to the lower part of the hot water storage tank 4, and is also supplied to the hot water supply mixing valve 8 and the general hot water supply mixing valve 9. It has become. The mixing valves 8 and 9 are supplied with hot water in the hot water storage tank 4 via a hot water supply pipe 7 having one end connected to the upper part of the hot water storage tank 4. One end of a hot-water supply pipe 13 through which mixed hot water from the hot-water supply mixing valve 8 flows is connected to the hot-water supply mixing valve 8, and the general hot-water supply mixing valve 9 is connected to the general hot-water supply mixing valve 9. One end of a general hot water supply pipe 17 for sending mixed hot water to a kitchen faucet or the like is connected. A hot water supply temperature sensor 28 and a hot water supply flow rate sensor 29 for detecting the temperature and flow rate of the mixed hot water flowing through the general hot water supply pipe 17 are respectively connected to the general hot water supply pipe 17.

  The hot water supply pipe 13 includes a hot water supply solenoid valve 14 that supplies and stops mixed hot water, a hot water flow sensor 15 that detects the flow rate of the mixed hot water flowing through the hot water supply pipe 13, and a hot water supply mixing valve. The bath temperature sensor 16 used for temperature correction of the hot water mixed by 8 is provided. Further, the other end of the bath hot water supply pipe 13 is connected to the middle of the bath circulation circuit 12 constituted by the bath forward pipe 21 and the bath return pipe 22.

  The bath piping 21 and the bath return piping 22 are connected to the bathtub 2 via the bathtub adapter 3. The bath return pipe 22 is connected to a bath circulation pump 23 for taking out the bathtub water in the bathtub 2 through the bath return pipe 22 and returning it to the bathtub 2 through the bath return pipe 21 for circulation. Further, the bath return pipe 22 has a flow switch 25 for detecting the presence or absence of the bath water flow, a water level sensor 26 for detecting the water level of the bath 2, and the temperature of the hot water flowing through the bath return pipe 22. A return temperature sensor 24 for detection is connected to each.

  A tank circulation circuit 18 is connected to the upper and lower portions of the hot water storage tank 4. A reheating heat exchanger 19 is interposed between the tank circulation circuit 18 and the return pipe 22. The heat exchanger 19 is for exchanging heat between the hot water stored in the hot water storage tank 4 and the bath water in the bathtub 2. Further, a bath circulation heat source pump 20 is installed in the middle of the tank circulation circuit 18. The hot water stored in the upper portion of the hot water storage tank 4 is circulated from the upper portion of the hot water storage tank 4 toward the lower portion by using the bath circulation heat source pump 20. The heat pump unit 5 is provided with an outside air temperature sensor 27 that detects the outside air temperature around the heat pump unit 5.

  The hot water storage type water heater 1 further includes a control unit 50 that comprehensively controls the hot water storage type water heater 1. The control unit 50 counts the current time and the elapsed time, and calculates the time required for filling and the filling start time. Further, the control unit 50 calculates a remaining hot water heat amount (heat storage amount) Qt in the hot water storage tank 4 based on input values of the remaining hot water thermistor 30a, the remaining hot water thermistor 30b, the remaining hot water thermistor 30c, and the remaining hot water thermistor 30d. . Specifically, the heat storage amount Qt is calculated as the product of the tank capacity (for example, 50L-0L = 50L) between the remaining hot water thermistors and the detected temperature from the remaining hot water thermistors 30a to 30d. For example, when the detected value of the remaining hot water thermistor 30a connected to the position of the hot water storage tank 50L is 60 ° C., the amount of heat calculated as the tank heat storage amount Qt = 60 ° C. × 50 L = 3000 cal is the tank remaining hot water amount Qt. Become.

  A remote controller 60 for remotely operating the hot water storage type hot water heater 1 is connected to the controller 50. In the remote controller 60, the user performs operations such as setting the amount of hot water to the bathtub 2 and the hot water temperature, boiling setting of the hot water storage tank 4, hot water operation, hot water operation, reheating operation, and input of settings.

  The hot water storage type water heater 1 of the present embodiment having the above-described configuration is a hot water filling from a state in which the remaining hot water of the previous day is present in the bathtub 2 (hereinafter referred to as “water-filled hot water filling”) in the hot water filling operation. It has features in operation. Hereinafter, a specific process of filling with water in the hot water storage type hot water heater 1 will be described in detail with reference to a flowchart.

  FIG. 2 is a flowchart showing a water-filled hot water supply routine of the hot-water storage type water heater 1. Note that the routine shown in FIG. 2 is a routine that is executed when the user fills in the hot water by operating the remote controller 60. In the hot water setting, specifically, the set temperature and the set hot water amount of the hot water are set by the user. When the routine shown in FIG. 2 is started, the control unit 50 first detects the bathtub temperature of the bathtub 2 by the bath return temperature sensor 24, and determines whether or not the detected bathtub temperature is lower than the set temperature (step S1). ). As a result, when the bath temperature is equal to or higher than the set temperature, the pouring operation to the bath is performed until the hot water set temperature and the set hot water amount are reached (step S8).

  On the other hand, if the bath temperature is lower than the set temperature in step S1, the control unit 50 uses the signals from the remaining hot water thermistor 30a, the remaining hot water thermistor 30b, the remaining hot water thermistor 30c, and the remaining hot water thermistor 30d to store the hot water storage tank. The amount of remaining hot water in 4 is calculated (step S2). Next, the amount of remaining hot water in the tank is compared with the bath temperature, and it is determined whether or not rapid chasing is possible without causing hot water shortage (step S3). Here, rapid chasing (first chasing operation) is a chasing operation in which hot water in the hot water storage tank 4 and hot water in the bathtub 2 are heat-exchanged by the heat exchanger 19 and the hot water temperature in the bathtub 2 is increased. Of these, it is a chasing operation that can raise the hot water temperature of the bathtub in a short time. More specifically, it refers to an operation in which the rotational speed of the bath circulation heat source pump 20 that circulates hot water in the hot water storage tank 4 is rotated at the maximum rotational speed (for example, 3000 rpm) and the follow-up ability is set to the maximum output. . Specifically, in this step S3, it is determined whether or not the remaining hot water amount calculated in the above step S2 can secure more than the amount of heat required when the reheating ability is the maximum output. As a result, if rapid chasing is possible, the process proceeds to the next step, and rapid chasing is performed to raise the temperature of the bath water (step S4).

  Next, it is determined whether or not the bathtub temperature has reached the set temperature (step S6). As a result, when the bathtub temperature is not the set temperature, the process proceeds to step S4 again to execute rapid tracking. On the other hand, if it is determined in step S6 that the bath water temperature has reached the set temperature, the process proceeds to the next step, and the hot water pouring operation is performed until the hot water at the hot water set temperature reaches the set hot water amount (step S8).

  In the above-described step S3, when hot water runs out due to rapid reheating, the process proceeds to the next step, and the temperature of the bath water is raised by mild reheating, and at the same time, boiling by the heat pump unit 5 is started (step S5). . Here, the mild chasing (second chasing operation) is a chasing operation in which hot water in the hot water storage tank 4 and hot water in the bathtub 2 are heat-exchanged by the heat exchanger 19 and the hot water temperature in the bathtub 2 is raised. Among them, the rotational speed of the bottom circulation heat source pump 20 is rotated at a low rotational speed (for example, 1000 rpm) so that the reheating capacity is equal to the heating capacity of the heat source unit of the heat pump unit 5 or lower than that of the rapid pursuit. It is a chasing action.

  Next, it is determined whether or not the bathtub temperature has reached the set temperature (step S7). As a result, when the bathtub temperature is not equal to the set temperature, the process proceeds to step S5 again to perform mild pursuit. On the other hand, when it is determined in step S7 that the bath water temperature has reached the set temperature, the process proceeds to step S8, and the hot water pouring operation is performed until the hot water at the hot water set temperature reaches the set hot water amount. At this time, boiling of the heat pump unit 5 may be stopped simultaneously, or may be continued until a predetermined amount of stored hot water (heat storage amount) is reached.

  As described above, according to the hot water storage-type water heater 1 of the first embodiment, the amount of heat required when the amount of remaining hot water in the tank (heat storage amount) is set to the maximum output when the water is filled with water can be secured. If it is, the time for raising the temperature of the bath water to the set temperature can be shortened by performing the quick chasing. In addition, when the amount of remaining hot water in the tank does not secure the amount of heat required when the reheating capability is set to the maximum output, the heating and heating operation by the heat source of the heat pump unit 5 is performed by performing a mild reheating. It is possible to prevent running out of hot water at the same time. Thus, it becomes possible to provide an easy-to-use heat pump water heater by properly using rapid chasing and mild chasing according to the amount of remaining hot water (heat storage amount).

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. The apparatus according to the present embodiment can be realized by causing the control unit 50 to execute a routine shown in FIG. 3 to be described later using the hardware configuration shown in FIG.

  The apparatus according to the present embodiment is characterized in that hot water pouring is performed prior to execution of rapid chasing when rapid chasing is possible in hot water filling with water. Here, the hot hot water is an operation of taking out hot hot water stored in the upper part of the hot water storage tank 4 from the hot water supply pipe 7 and pouring it into the bathtub 2. Specifically, for example, the temperature correction is performed by adjusting the opening of the hot water supply mixing valve 8 so that the hot water of the hot water storage tank 4 is heated to about 60 ° C. from about 90 ° C. hot water and about 10 ° C. city water. This is an operation of raising the temperature of the bathtub water by opening the hot water solenoid valve 14 and supplying hot water to the bathtub 2. As a result, rapid heating can be executed after effectively raising the temperature of the remaining water in the bathtub 2, so that the time for raising the temperature of the bathtub water to the set temperature can be effectively shortened. Further, if high-temperature hot water is executed when there is a hot water filling, it is possible to reduce the burden of temperature rise due to rapid reheating, so that the medium-temperature water (which passes through the heat exchanger 19 and is returned to the hot water storage tank 4 ( It is possible to increase the boiling efficiency by effectively reducing the amount of reflux of hot water that has fallen in temperature after heat exchange.

  FIG. 3 is a flowchart showing a hot water filled routine of the hot water storage type hot water heater 1 according to the second embodiment. In FIG. 3, the same or corresponding parts as those in FIG. In step S30, the amount of remaining hot water in the hot water storage tank is compared with the bath temperature, and it is determined whether or not hot hot water and rapid chasing are possible without causing hot water shortage. As a result, if possible, the process proceeds to step S10, the hot water hot water operation is executed, and the process proceeds to step S4, and if not possible, the process proceeds to step S5.

  As described above, according to the hot water storage type hot water supply apparatus 1 of the second embodiment, when performing a quick replenishment when filling with hot water, hot hot water is performed prior to this. As a result, rapid heating can be executed after effectively raising the temperature of the remaining water in the bathtub 2, so that the time for raising the temperature of the bathtub water to the set temperature can be effectively shortened.

Embodiment 3 FIG.
Next, Embodiment 3 of the present invention will be described with reference to FIG. The apparatus according to the present embodiment can be realized by causing the control unit 50 to execute a routine shown in FIG. 4 to be described later using the hardware configuration shown in FIG.

  The apparatus according to the present embodiment is characterized by a hot water filled operation accompanied by a bath reservation operation. Here, the bath reservation operation refers to an operation in which the user sets the hot water filling completion time of the day by the remote controller 60 and automatically completes the hot water filling operation to the bathtub 2 by the set time. Hereinafter, the detailed operation | movement is demonstrated along a flowchart. FIG. 4 is a flowchart showing a water-filled hot water routine according to the bath reservation of the hot-water storage type water heater 1 in the third embodiment. Note that the routine shown in FIG. 4 is a routine that is executed when hot water filling setting (hot water filling completion time, set hot water amount and set temperature) is made by a bath reservation by the user operating the remote controller 60.

  In the routine shown in FIG. 4, when the user sets the hot water filling completion time (for example, 18:00) of the day using the remote controller 60, first, the control unit 50 calculates the hot water filling from the detection values of the return temperature sensor 24 and the water level sensor 26. The required amount of heat is calculated (step S11). Next, a hot water filling start time (for example, 17:30) is calculated (step S12). Next, in the case where the amount of insufficient heat with respect to the required heat is additionally boiled by the heat pump unit 5, the additional boiling time (for example, 1 hour) required for this is also calculated (step S13). It is desirable that the additional boiling time be increased as the amount of remaining hot water in the tank is smaller in order to avoid running out of hot water.

  Next, the bath temperature is detected at a time (for example, 16:30) before the hot water filling start time (for example, 17:30) by an additional boiling time (for example, 1 hour) by the heat pump unit 5 (step S14). Next, it is determined whether or not the bathtub temperature detected in step S14 is lower than the set temperature (step S15). As a result, when it is determined that the bathtub temperature is not lower than the set temperature, the hot water pouring operation to the bathtub 2 is performed until the hot water set temperature and the set hot water amount are reached when the hot water start time is reached (step S19). On the other hand, when it is determined in step S15 that the bathtub temperature is lower than the set temperature, the process proceeds to the next step, and a boiling operation by the heat pump unit 5 is performed (step S16).

  Next, it is determined whether or not the necessary amount of heat required for hot water filling has been secured (step S17). As a result, if the necessary amount of heat required for filling the hot water cannot be secured yet, the process proceeds to step S16 again and the boiling operation by the heat pump unit 5 is performed again. On the other hand, if it is determined in step S17 that the necessary amount of heat required for hot water filling has been secured, the process proceeds to the next step, and when the hot water filling start time is reached, the bath water temperature is raised to the set temperature by rapid chasing. (Step S18). Next, a hot water pouring operation is performed on the bathtub until the hot water filling set temperature and the set hot water amount are reached (step S19).

  As described above, according to the apparatus of the present embodiment, in the bath reservation operation with bath water, additional boiling is performed by the heat pump unit 5 before the hot water filling start time, and the reheating ability is set to the maximum output. By doing so, it becomes possible to provide a heat pump type hot water heater that is easy to use by shortening the time for raising the temperature of the bath water to the hot water setting temperature and preventing the hot water from running out.

DESCRIPTION OF SYMBOLS 1 Hot water storage type water heater 2 Bathtub 4 Hot water storage tank 5 Heat pump unit (heating means)
18 Tank circulation circuit 19 Heat exchanger 20 Bath circulation heat source pump (circulation heat source pump)
24 bath temperature sensor (temperature detection means)
26 Water level sensor (water volume detection means)
30a, 30b, 30c, 30d, remaining hot water thermistor (heat storage amount acquisition means)
50 Control unit

Claims (5)

A boiling operation for heating the hot water in the hot water storage tank using a heating means,
A hot water filling operation in which a set hot water temperature and a set amount of hot water are put in the bathtub,
One end is connected to the upper part of the hot water storage tank, a heat exchanger is installed in the middle, the other end is connected to the lower part of the hot water storage tank, and the tank is arranged in the middle of the tank circulation circuit. A circulation heat source pump that circulates hot water in the hot water storage tank in a circulation circuit, and operating the circulation heat source pump to exchange heat between the hot water in the hot water storage tank and the hot water in the bathtub. Driving,
A hot water storage type water heater capable of performing
When performing the hot water filling operation from the state in which the bathtub water having a temperature lower than the set hot water temperature is stored in the bathtub, a reheating operation means for heating the bathtub water by the reheating operation;
Hot water filling means for supplying hot water in the hot water storage tank into the bathtub until the hot water in the bathtub reaches the set hot water temperature and the set hot water amount after the execution of the reheating operation means,
The chasing driving means is:
A heat storage amount acquisition means for acquiring a heat storage amount in the hot water storage tank;
When the heat storage amount is larger than a predetermined amount, a first reheating operation is performed in which the circulation heat source pump is controlled to a predetermined number of revolutions to perform reheating, and when the heat storage amount is less than a predetermined amount, the circulation is performed. Control means for controlling the heat source pump to a rotational speed lower than the predetermined rotational speed to perform a reheating operation and simultaneously performing a second reheating operation for performing the boiling operation;
A hot water storage water heater characterized by including.   Prior to the execution of the first chasing operation in the chasing operation means, the apparatus further comprises high temperature hot water supplying means for performing hot hot water supplying hot water stored in the upper part of the hot water storage tank to the bathtub. The hot water storage type water heater according to claim 1, wherein Water amount detection means for detecting the amount of bathtub water stored in the bathtub; and
Temperature detecting means for detecting the temperature of the bathtub water stored in the bathtub;
And a necessary heat amount calculating means for calculating a heat amount necessary for heating the bathtub water to the set hot water temperature based on the temperature and the water amount of the bathtub water,
The reheating operation means sets the heat storage amount in the hot water storage tank necessary for heat exchange of the necessary heat amount to the bath water in the heat exchanger as the predetermined amount. 2. A hot-water storage water heater according to 2. A bath reservation means for performing a reservation operation at the completion time of the hot water operation,
When the amount of stored heat is equal to or less than a predetermined amount, prior to the execution of the follow-up operation means, further comprising additional boiling means for performing the boiling operation until the amount of stored heat reaches the predetermined amount,
The hot water storage type hot water supply apparatus according to claim 3, wherein the bath reservation means determines the start timing of the additional boiling operation so that the hot water filling operation is completed by the completion time.   The hot water storage type according to claim 4, wherein the bath reservation means determines the start time of the additional boiling operation earlier as the amount of heat necessary for the heat storage amount to reach the predetermined amount is larger. Water heater.

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