JP2012220119A - Hot-water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water storage type water heater that controls hot-water filling operation without causing hot-water shortage to sudden hot-water supply demand which frequently occurs during seasonal transition.SOLUTION: The heat pump water heater 120 has boiling operation for heating water contained in a hot-water storage tank 20 through a heat pump unit 10 to make hot water and hot-water supply operation for supplying an amount of heat stored in the hot-water storage tank 20 to a bathtub 150. A target heat accumulation amount Q to be accumulated collectively in the hot-water storage tank 20, on the basis of the amount of use quantity of heat in the past few days. The heat pump water heater includes an outdoor air temperature detection means for detecting an outdoor air temperature, and a deciding means deciding whether the hot-water supply operation has been performed or not in the past few days. When the minimum temperature of outdoor air temperature in a predetermined period is below a predetermined reference value in the past and the deciding means decides that the hot-water supply operation has not been performed, the heat pump water heater increases a target thermal storage amount by a predetermined quantity.

Description

  The present invention relates to a hot water storage type water heater.

  In a heat pump type hot water heater, generally, the amount of use expected in one day is boiled using a heat pump and stored in a hot water storage tank, and then the hot water in the hot water storage tank is used for hot water supply. For this reason, when consumption of hot water exceeding the expected amount is required, hot water may inevitably be insufficient. In addition, the running cost increases even if the hot water is boiled excessively. For example, in the hot water storage type hot water heater described in Patent Document 1, the target heat storage amount required for one day is calculated from the amount of heat used and the outside air temperature for the past several days and the outside air temperature transition on the previous day, and the boiling water is stored in the tank. Raising operation is performed.

JP 2005-257213 A

  However, in the summer, etc., when calculating the target amount of heat storage required to be heated up from the past amount of heat used in the day, etc. When the season changes to winter, etc., when hot water filling, which is the largest hot water supply load of a water heater, suddenly begins to run, there is a possibility that hot water shortage may occur due to using more heat than before. high.

  The present invention has been made to solve the above-described problems, and is a hot water storage type hot water supply device that controls boiling so that hot water does not run out in response to a sudden hot water filling request that easily occurs at the turn of the season. The purpose is to provide.

The hot water storage type water heater according to the present invention includes a boiling operation for heating the water in the hot water storage tank by heating means to make hot water, and a hot water filling operation for supplying the amount of heat stored in the hot water storage tank into the bathtub. This is a hot water storage type hot water heater that can be used to calculate the amount of heat stored in the hot water tank in a batch based on the amount of heat used in the past few days, and the amount of heat stored in the hot water tank by boiling operation. Batch boiling means for storing in a batch, outside temperature detection means for detecting outside temperature,
It is determined that the determination means for determining whether or not the hot water filling operation has been performed in the past several days, and the minimum temperature of the outside air temperature in the past predetermined period is equal to or less than a predetermined reference value, and that the hot water operation is not performed by the determining means. And a correction means for increasing the amount of heat stored by the batch boiling means by a predetermined amount.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage type water heater which controls boiling up so that it may not run out of hot water with respect to the sudden hot water filling request | requirement which is easy to generate | occur | produce at the change of a season can be provided.

It is a block diagram of the hot water storage type water heater in Embodiment 1 of this invention. It is a flowchart which shows the routine performed in Embodiment 1 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. Further, the present invention is not limited by this embodiment.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating an example of a heat pump type water heater according to Embodiment 1 of the present invention. The heat pump type hot water heater 120 shown in this figure is used in the bathtub 150, a function of boiling low temperature water such as city water into hot water with a heat source machine and supplying hot water to a desired location, a function of supplying hot water of an appropriate temperature to the bathtub 150, and the like. It has a function of chasing the bath water 150a. The heat pump type hot water supply device 120 includes a heat pump unit 10 and a hot water supply unit 100. Hereinafter, each component of the heat pump type water heater 120 will be described.

  The heat pump unit 10 is a refrigeration cycle system including a compressor 1 that compresses refrigerant, a heat exchanger 3 for boiling, an expansion valve 5, an evaporator 7, and a circulation pipe 9 that connects these in an annular shape. It functions as a heat source machine. In the above-described refrigeration cycle system, the refrigerant is compressed by the compressor 1 to become high temperature and high pressure and then radiated by the boiling heat exchanger 3, depressurized by the expansion valve 5, and absorbed by the evaporator 7 to be in a gas state. And is sucked into the compressor 1. Moreover, the heat pump unit 10 includes an HPU control unit 1a that detects an outside air temperature or the like using the outside air temperature sensor 1b. The HPU control unit 1a is connected to the control unit 90 of the hot water supply unit 100, and transmits / receives data related to information such as a boiling operation instruction and an outside air temperature to / from the control unit 90.

  On the other hand, the hot water supply unit 100 includes a hot water storage tank 20, a water supply line 30, a heating circulation line 40, a heat source circulation line 50, a reheating circulation line 60, a reheating heat exchanger 65, a hot water supply line 80, And the control unit 90 described above. The hot water storage tank 20 is made of stainless steel, stores water supplied from the water supply conduit 30, and stores hot water boiled by the heat pump unit 10, and is always kept in a full water state. The hot water storage tank 20 includes a first remaining hot water temperature sensor 28a, a second remaining hot water temperature sensor 28b, a third remaining hot water temperature sensor 28c, a fourth remaining hot water temperature sensor 28d, a fifth remaining hot water temperature sensor 28e, and a second remaining hot water temperature sensor 28e. The 6 remaining hot water temperature sensor 28f is installed in the vertical direction from the upper part of the hot water storage tank 20, for example in the position used as 0L, 50L, 100L, 150L, 240L, 320L. The controller 90 calculates the current heat storage amount in the hot water storage tank 20 using the temperature information detected by each remaining hot water temperature sensor 28.

  The water supply pipe 30 is a pipe that supplies low-temperature water such as city water to the hot water storage tank 20, the first mixing valve 75a, the second mixing valve 75b, and the hot water tap 160, and the first to fourth water supply pipe sections 30a to 30a. 30d and a pressure reducing valve 25 for reducing the water pressure to a predetermined value or less. Specifically, the first water supply pipe section 30a connects a water source (not shown) such as a water supply and the pressure reducing valve 25, the second water supply pipe section 30b connects the pressure reducing valve 25 and the lower part of the hot water storage tank 20, The three water supply pipe sections 30c connect the pressure reducing valve 25 and the first and second mixing valves 75a and 75b. The fourth water supply pipe portion 30d branches from the first water supply pipe portion 30a and connects the first water supply pipe portion 30a and the hot water tap 160. Further, a water supply temperature sensor 31 is installed in the first water supply pipe section 30a, and the control section 90 detects the sensor value of the water supply temperature sensor 31.

  The heating circulation pipe 40 is a pipe that takes water from the lower part of the hot water storage tank 20 and returns it to the hot water storage tank 20 from the upper part of the hot water storage tank 20, and includes an outgoing pipe 40a, a return pipe 40b, and a boiling water pump 35. Is included. Specifically, the forward pipe 40 a connects the lower part of the hot water storage tank 20 and the boiling heat exchanger 3, and the return pipe 40 b connects the boiling heat exchanger 3 and the upper part of the hot water storage tank 20. The boiling water pump 35 is provided in the middle of the forward pipe 40a.

  The heat source circulation pipe 50 is a pipe that takes hot water from the upper part of the hot water storage tank 20 and returns the hot water from the lower part of the hot water storage tank 20 to the hot water storage tank 20, and includes the forward pipe 50a, the return pipe 50b, and the heat source water supply pump 45. Is included. Specifically, the forward pipe 50 a connects the upper part of the hot water storage tank 20 and the upper part of the reheating heat exchanger 65, and the return pipe 50 b connects the lower part of the reheating heat exchanger 65 and the lower part of the hot water storage tank 20. It is out. The heat source water pump 45 is provided in the middle of the return pipe 50b.

  The recirculation circulation pipe 60 is a pipe that takes the bath water 150a from the side of the bathtub 150 and returns it to the bathtub 150 from the side of the bathtub 150. The return pipe 60a, the return pipe 60b, and the reheating pipe A water pump 55 is included. Specifically, the return pipe 60b connects the side part of the bathtub 150 and the bathtub side inlet at the lower part of the reheating heat exchanger 65, and the outgoing pipe 60a is at the upper part of the reheating heat exchanger 65. The bathtub side outlet and the side part of the bathtub 150 are connected. Further, the water supply pump 55 for chasing is provided in the middle of the return pipe 60b.

  The reheating heat exchanger 65 is a plate heat exchanger in which a plurality of heat transfer plates are stacked in the height direction of the reheating heat exchanger 65, and hot water flowing through the heat source circulation pipe 50 Heat is exchanged with the bath water 150a flowing through the recirculation circulation line 60 to heat the bath water 150a.

  The hot water supply line 80 supplies hot water stored in the hot water storage tank 20 to the bathtub 150 and the hot water tap 160. The first to third hot water supply pipe parts 80a to 80c, the first mixing valve 75a, and the first 2 mixing valve 75b is included. Specifically, the end of the first hot water supply pipe section 80a on the hot water storage tank 20 side is a shared pipe shared with the forward pipe 50a of the heat source circulation pipe 50, and the first hot water supply pipe section 80a The downstream end of the two branches into two flow paths, one connected to the first mixing valve 75a and the other connected to the second mixing valve 75b. The second hot water supply pipe section 80 b connects the first mixing valve 75 a and the forward pipe 60 a in the recirculation circulation line 60, and the recirculation circulation line 60 is connected to a part of the hot water supply line 80. It has become. The first hot water supply pipe portion 80a, the first mixing valve 75a, the second hot water supply pipe portion 80b, and the recirculation circulation pipe line 60 constitute a pouring pipe line for supplying hot water in the hot water storage tank 20 to the bathtub 150. Yes. The second hot water supply pipe portion 80b is provided with a bath flow sensor 81 and a bath temperature sensor 82. A return temperature sensor 61 is installed in the return pipe 60b, and the control unit 90 detects the values of these sensors. Furthermore, the upstream end of the third hot water supply pipe section 80 c in the hot water supply pipe line 80 is connected to the second mixing valve 75 b, and the downstream end of the third hot water supply pipe section 80 c is connected to the hot water tap 160. The third hot water supply pipe section 80c is provided with a hot water supply flow rate sensor 33 and a hot water supply temperature sensor 32, and the control unit 90 detects the values of the sensors.

  The control unit 90 is configured to input the heat pump unit 10, the boiling water pump 35, the heat source water pump 45, the reheating water pump based on input information such as the amount of hot water and the hot water temperature input by the user from the remote controller operation unit 95. 55, the operation of the first mixing valve 75a and the second mixing valve 75b is controlled. Each of the first mixing valve 75a and the second mixing valve 75b is an electric mixing valve. The remote control operation unit 95 is used as an input device for the control unit 90 by wired connection or wireless connection to the control unit 90. Further, the control unit 90 detects the values of the water supply temperature sensor 31, the hot water supply temperature sensor 32, the hot water supply flow rate sensor 33, the bath return temperature sensor 61, the bath flow rate sensor 81, and the bath temperature sensor 82. Based on the value of each sensor, the amount of heat used from the hot water storage tank 20 is calculated and stored.

  In the hot water storage type water heater 120 having the above-described configuration, the heat pump unit 10 and the boiling water pump 35 operate under the control of the control unit 90, and the boiling operation is performed. At this time, water taken from the lower part of the hot water storage tank 20 is heated to hot water in the process of flowing through the heating circulation line 40 and passing through the heating heat exchanger 3, and from the upper part of the hot water storage tank 20 to the hot water storage tank 20. Returned to A temperature sensor (not shown) is provided at the downstream end of the forward pipe 40a of the heating circulation pipe 40, and the controller 90 monitors the temperature detected by the temperature sensor, and the detected temperature is a predetermined temperature. Then, the boiling operation is terminated.

  When the user instructs hot water filling from the remote control operation unit 95, the operation of the first mixing valve 75a is controlled by the control unit 90, and the hot water in the hot water storage tank 20 is mixed with city water and adjusted to a predetermined hot water temperature. A predetermined amount of hot water is supplied to 150. When the user opens the hot water tap 160, the controller 90 controls the operation of the second hot water / water mixing valve 75b, and the hot water in the hot water storage tank 20 is mixed with city water and adjusted to a predetermined hot water temperature. Hot water is supplied from the hot water tap 160. When the hot water filling is completed, the result of the hot water filling is stored in the control unit 90.

  Then, when the user gives an instruction to retreat the bath water 150a from the remote controller operation unit 95, the heat source water supply pump 45 and the replenishment water supply pump 55 operate under the control of the control unit 90, and the reheating operation is performed. . At this time, hot water taken from the upper part of the hot water storage tank 20 flows through the heat source circulation conduit 50 and is returned from the lower part of the hot water storage tank 20 to the hot water storage tank 20, while bath water 150 a taken from the bathtub 150 is added. It flows through the circulating circulation pipe 60 and is returned to the bathtub 150. Thus, in the reheating heat exchanger 65, heat is exchanged between the hot water flowing through the heat source circulation pipe 50 and the bath water 150a flowing through the recirculation circulation pipe 60, and the bath water 150a is reclaimed. Is done. The controller 90 ends the chasing operation when the detection value of the bath return temperature sensor 61 provided in the return pipe 60b reaches a predetermined temperature.

  Next, the characteristic operation of the heat pump water heater according to the embodiment of the present invention will be specifically described with reference to FIG. FIG. 2 is a flowchart showing a routine for the heat pump water heater according to the embodiment of the present invention to calculate a target heat storage amount. Hereinafter, the details of the method for determining the target heat storage amount will be described with reference to the flowchart shown in FIG.

  First, in step S1, the target heat storage amount Q is calculated from the amount of heat used for a certain period and the water temperature, and the process proceeds to step S2. For example, the maximum amount of heat used or the average amount of heat used in the past seven days of heat used may be set as the target heat storage amount Q. In addition, taking into account variations in the amount of heat used every day, a margin may be added to the target heat storage amount so that the hot water does not run out.

  In step S2, when the minimum outside air temperature for a certain period is equal to or lower than the predetermined temperature, the process proceeds to step S3. For example, this is the case where the minimum outside air temperature for the past three days including the day is 20 ° C. or lower. When the outside air temperature for a certain period is equal to or higher than the predetermined temperature, it is unlikely that the daily usage of hot water will change rather than the change of season from summer to winter. In order to suppress an increase in running cost due to useless boiling, the target heat storage amount calculation flow is terminated with the heat storage amount Q calculated in step S1. In this step, if the minimum outside air temperature is equal to or lower than the predetermined temperature, the process proceeds to step S3. However, if the calendar function is provided, it is within a predetermined period (for example, during the period from September to December). ), The process proceeds to step S3. If it is outside the predetermined period (for example, during the period from January to August), the flow may be terminated.

  In step S3, if there is no record of completion of filling for a certain period, the process proceeds to step S4. For example, there is a case where there has never been a hot water filling in the past seven days. If there is a record of hot water filling for a certain period, the target heat storage amount Q calculated in step S1 includes the amount of heat of hot water filling, and the calculation flow of the target heat storage amount for one day is ended.

  In step S4, when the amount of heat corresponding to hot water filling is not used at a time for a certain period, the process proceeds to step S5. For example, there is a case where the amount of heat corresponding to 42 ° C. and 180 L has never been used with hot water supply once in the past seven days. In addition, if the amount of heat corresponding to hot water filling is used for a certain period of time with hot water supply, it is estimated that hot water filling was performed by supplying hot water from a faucet or the like instead of from the hot water from the remote control operation unit. it can. In this case, the target heat storage amount Q calculated in step S1 includes the amount of hot water, and thus the target heat storage amount calculation flow ends. In this step, the amount of heat corresponding to the hot water filling per unit time may be used instead of the amount of heat corresponding to the hot water filling at a time. For example, if there is no use of heat corresponding to 180 L or higher at 42 ° C. in 30 minutes in the past 7 days, the process proceeds to step 5.

  In step S5, the amount of heat used for filling is added to the target heat storage amount Q calculated in step S1. For example, it may be added to the target heat storage amount assuming a heat amount of 42 ° C. and 180 L, or a heat amount calculated from the hot water amount and the hot water temperature set by the remote controller may be added. Moreover, you may add not only the calorie | heat amount used for a hot water filling but the calorie | heat amount used for a chasing.

  Based on the value of the target heat storage amount Q calculated as described above, the control unit 90 considers the remaining heat storage amount in the hot water storage tank 20 and performs a boiling operation operation collectively so that the target heat storage amount Q can be secured. . The calculation of the target heat storage amount Q in this step may be performed at a specific time, for example, at the start of the midnight time zone or at the end of the midnight time zone. Moreover, you may always update.

  As described above, according to the heat pump water heater of the present embodiment, when the minimum outside air temperature for a certain period is equal to or lower than the predetermined temperature, and when there is no use of hot water and heat equivalent to hot water for a certain period, the target The amount of heat used for hot water filling is added to the heat storage amount Q. Accordingly, it is possible to predict a sudden hot water filling request that is likely to occur at the turn of the season, and to control the boiling so as not to run out of hot water.

1b Outside temperature sensor 10 Heat pump unit 20 Hot water storage tank 90 Control unit 100 Hot water supply unit 120 Heat pump hot water heater 150 Bathtub

Claims (4)

A hot water storage type hot water heater capable of performing a boiling operation in which water in a hot water storage tank is heated by heating means to make hot water, and a hot water filling operation in which the amount of heat stored in the hot water storage tank is supplied into a bathtub. And
Based on the amount of heat used in the past several days, heat storage amount calculating means for calculating the amount of heat stored in the hot water storage tank at once,
Batch boiling means for collectively storing the heat storage amount in the hot water storage tank by the boiling operation;
An outside air temperature detecting means for detecting the outside air temperature;
Determination means for determining whether or not the hot water operation is performed in the past several days;
When the minimum temperature of the outside air temperature in the past predetermined period is equal to or less than a predetermined reference value and the determination unit determines that the hot water filling operation is not performed, the heat storage amount by the batch boiling unit is calculated. Correction means for increasing the predetermined amount;
A hot water storage type water heater characterized by comprising:   The hot water storage type hot water heater according to claim 1, wherein the correction means increases the heat storage amount required for the hot water operation as the predetermined amount.   3. The hot water storage type hot water supply apparatus according to claim 1, wherein the hot water filling operation includes a reheating operation for supplying heat to the hot water in the bathtub.   4. The hot water storage type hot water heater according to claim 1, wherein the hot water filling operation includes an operation in which a predetermined amount or more of heat stored in the hot water storage tank is supplied per unit time. 5. .

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