JP5656165B2 - Hot water storage hot water supply system - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply system capable of performing instant hot water.

  2. Description of the Related Art Conventionally, there is a hot water storage type hot water supply system that can perform immediate hot water that immediately drains hot water at the time of hot water. In this hot water storage type hot water supply system, the temperature of the hot water in the pipe of the hot water path is changed by performing the quick hot water circulation operation in which the hot water in the hot water storage tank is circulated in the pipe of the hot water path connecting the hot water storage tank and the outlet terminal. Is kept at a high temperature (see, for example, Patent Document 1).

  A control method of the hot water circulation operation of this type of hot water storage hot water supply system will be described with reference to FIG. The control unit that controls the entire system determines whether or not the hot water temperature in the pipe of the immediate hot water path is lower than a preset hot water set temperature (S1). When the hot water temperature is lower than the immediate hot water set temperature (Yes in S1), the control unit performs the immediate hot water circulation operation once (S2). Thereby, the hot water boiled in the pipe of the immediate hot water path circulates, and the hot water temperature in the pipe of the immediate hot water path is kept high.

JP 2008-157551 A

  In the hot water storage type hot water supply system as described above, the hot water circulation operation is always performed when the hot water temperature in the pipe of the hot water path becomes lower than the hot water set temperature. Therefore, if the hot water is not used for a long time, the hot water circulation operation is repeated many times whenever the hot water temperature becomes lower than the immediate hot water set temperature. The amount of heat is lost wastefully. Thereby, heat energy is wasted.

  The present invention has been made to solve the above problem, and an object of the present invention is to provide a hot water storage type hot water supply system capable of reducing a wasteful loss of heat amount in the hot water circulation operation.

The hot water storage type hot water supply system of the present invention includes a hot water storage tank and a hot water outlet terminal for discharging hot water from the hot water storage tank through a pipe, and performs an immediate hot water circulation operation for immediately discharging high temperature hot water at a predetermined temperature from the hot water outlet terminal. in the hot-water storage type hot-water supply system, based on a signal input regardless of water temperature in the pipes have a control unit to initiate an immediate hot water circulation operation, the time required to substantially migrate into the immediate hot water circulation operation It is previously obtained, and further comprising said Rukoto the means for displaying to remember this time.

  In the hot water storage type hot water supply system, it is preferable that the signal is input to the control unit from the outside by a user operation or by detecting the presence of the user.

  The hot water storage hot water supply system further includes an input unit for inputting the signal to the control unit, and the input unit is a switch or a sensor that operates in association with a change in environment including a user near the hot water terminal. Preferably there is.

  In this hot water storage type hot water supply system, it is preferable to further include means for presetting and storing a time at which the hot water circulation operation is performed.

  According to the hot water storage type hot water supply system according to the present invention, the immediate hot water circulation operation start signal is input only when the immediate hot water circulation operation is necessary, and the immediate hot water circulation operation is performed. That is, when the time when hot water is not used continues, the hot water circulation operation is not performed, so that a wasteful loss of heat can be reduced.

The figure which shows the structure of the hot water storage type hot-water supply system of this embodiment. The block diagram of the start signal input means of the same system. The flowchart which shows the control method of the instant hot water circulation operation of the system. The figure which shows the 1st modification of the system. The flowchart which shows the calculation method of the time which the immediate hot water circulation driving | running of the modification is required. The flowchart which shows the timer function of the modification. The figure which shows the 2nd modification of the system. The flowchart which shows the control method of the conventional instant hot water circulation driving | operation.

  Hereinafter, a hot water storage type hot water supply system according to an embodiment of the present invention will be described with reference to FIG. A hot water storage hot water supply system 1 includes a hot water storage tank 2 for storing hot water, a heat pump 3 for heating hot water, a water supply pipe 4 for supplying water to the hot water storage tank 2, a hot water tap 5 for discharging hot water, high temperature hot water and medium hot water. A mixing plug 6 for mixing and discharging hot water and a controller 7 for controlling the present system are provided.

  A plurality of heat pumps 3 are provided, each of which is in a parallel relationship. The hot water storage tank 2 and each of the heat pumps 3 are connected via a feed pipe 8 and a return pipe 9, and hot water is boiled by circulating hot water between them. The water supply pipe 4 is connected to the feed pipe 8 and supplies water to the hot water storage tank 2 from the bottom thereof. The hot water tap 5 is connected to the downstream end of the high temperature hot water supply pipe 10 connected to the upper part of the hot water storage tank 2. The mixing tap 6 is connected to the downstream end of the mixed hot water piping 11 branched from the high temperature hot water piping 10. The control unit 7 includes a timer and a CPU (Central Processing Unit), and controls the hot water circulation operation as will be described later. The instant hot water circulation operation is started based on an input signal regardless of the hot water temperature in the pipe. This signal is input to the control unit 7 from the outside by a user operation or by detecting the presence of the user.

  The hot water piping 12 for performing the hot water circulation operation branches from the high-temperature hot water piping 10, and passes through the hot water pump 13, the three-way valve 14 for switching the hot water flow path, and the check valve 15 for preventing the back flow of hot water. The hot water storage tank 2 is connected to the side. A pressure reducing valve 16 for reducing the pressure of the hot water is provided in the hot water piping 12 between the quick water pump 13 and the three-way valve 14. When the hot water pump 13 is driven, the hot water boiled in the hot water storage tank 2 circulates in the high temperature hot water supply pipe 10.

  An escape pipe 17 for allowing hot water to escape from the upper part of the hot water storage tank 2 at the time of thermal expansion of the hot water branches off from the high temperature hot water supply pipe 10. The relief pipe 17 is provided with a relief valve 18 that opens when the pressure in the hot water storage tank 2 becomes a predetermined pressure (0.19 MPa) or more.

  A medium temperature branch pipe 19 for delivering medium temperature hot water from the side of the hot water storage tank 2 to the mixed hot water piping 11 is led out and connected to a three-way valve 14 provided in the mixed hot water piping 11. A low-temperature branch pipe 20 for sending water in the water supply pipe 4 to the mixed hot water supply pipe 11 branches from the water supply pipe 4 and passes through a check valve 15 to adjust the hot water temperature provided in the mixed hot water supply pipe 11. 21 is connected.

  The feed pipe 8 is provided with a drain plug, a three-way valve 14 and a pressure reducing valve 16, and the return pipe 9 is provided with a three-way valve 14 and a pressure reducing valve 16. The water supply pipe 4 is provided with a stop cock, a pressure reducing valve 16 and a flow rate counter 22 in this order. The mixed hot water supply pipe 11 is provided with a three-way valve 14, a check valve 15, a temperature control valve 21, and a flow rate counter 22. Further, a remote controller 23 for remotely controlling the control unit 7 is provided. With the remote controller 23, for example, the boiling temperature of hot water in the plurality of heat pumps 3 can be set. The power supply unit of the control unit 7 is connected to, for example, a single-phase 200V external power supply. The control unit 7 is connected to each of the heat pumps 3 via a communication line. Each of the heat pumps 3 is connected to a single-phase 200V external power source, for example. A heat pump unit is composed of a plurality of heat pumps 3, and a hot water storage tank unit is composed of a portion including the hot water storage tank 2 and surrounded by a frame 24 shown in FIG. 1. High temperature hot water is stored in the upper layer portion of the hot water storage tank 2, intermediate temperature hot water is stored in the middle layer portion, and low temperature hot water is stored in the lower layer portion.

  The hot water storage type hot water supply system 1 of this embodiment includes an input unit that inputs a start signal input to the control unit 7 regardless of the hot water temperature in the pipe. FIG. 2 shows the configuration of the input means. As the input means, for example, a human sensor 25 that is provided in the vicinity of a hot water outlet terminal such as the hot water tap 5 or the mixing tap 6 (FIG. 1) is used. When the human sensor 25 detects the movement of the person, the human sensor 25 transmits a start signal for starting the immediate hot water circulation operation to the control unit 7. When the control unit 7 receives the start signal from the human sensor 25, the control unit 7 starts the hot water circulation operation.

  Operation | movement of the hot water storage type hot water supply system 1 of the above structures is demonstrated. When the hot water tap 5 is opened, water is supplied to the hot water storage tank 2 from the bottom of the hot water storage tank 2 through the water supply pipe 4 by the supply water pressure. When water is supplied to the hot water storage tank 2, low temperature hot water stored in the lower layer of the hot water storage tank 2 is supplied from the bottom of the hot water storage tank 2 to the plurality of heat pumps 3 through the feed pipes 8. The low temperature hot water supplied to the plurality of heat pumps 3 is heated to become high temperature hot water, and circulates and is supplied from the upper part of the hot water storage tank 2 to the hot water storage tank 2 through the return pipe 9. Then, the hot water stored in the upper layer portion of the hot water storage tank 2 is discharged from the hot water tap 5 through the high temperature hot water supply pipe 10. When hot water is discharged from the hot water tap 5, water is supplied from the bottom of the hot water storage tank 2 by the amount of the discharged water.

  When the mixing tap 6 is opened, it operates in the same manner as when the tap 5 is opened, and the hot water that has passed through the mixed hot water supply pipe 11 or the intermediate temperature branch pipe 19 and the water that has passed through the low temperature branch pipe 20 Are mixed and discharged from the mixing tap 6.

  When the control unit 7 receives the start signal from the human sensor 25, the control unit 7 starts the hot water circulation operation. Here, with reference to FIG. 3, the control method of the hot water circulation operation will be described. First, the control unit 7 determines whether there is a start signal (S1). When there is a start signal (Yes in S1), the control unit 7 performs the hot water circulation operation once (S2). This one-time hot water circulation operation is performed until the hot water boiled in the high temperature hot water piping 10 circulates and the hot water temperature in the high temperature hot water piping 10 reaches a predetermined temperature. In S1, when there is no start signal (No in S1), the control unit 7 enters a standby state.

  Thus, in the hot water storage type hot water supply system 1 according to the present embodiment, the immediate hot water circulation operation start signal is input only when the immediate hot water circulation operation is necessary, and the immediate hot water circulation operation is performed. That is, when the time when hot water is not used continues, the hot water circulation operation is not performed, so that wasteful loss of heat can be reduced.

  Next, a first modification of the hot water storage type hot water supply system 1 will be described. As shown in FIG. 4, in the hot water storage type hot water supply system 1a according to this modification, in addition to the configuration of the hot water storage type hot water supply system 1, the time required for substantially shifting to the immediate hot water circulation operation is obtained in advance. Means for storing and displaying this time is provided. Specifically, the time required for the hot water circulation operation is calculated and determined by the control unit 7 as will be described later. The obtained hot water circulation operation time is notified to the remote controller 23. The notified hot water circulation operation time is stored and displayed in the remote controller 23. In addition, the high temperature hot water piping 10 is provided with a first temperature sensor (not shown) for detecting the hot water temperature. The immediate hot water pipe 12 is provided with a second temperature sensor (not shown) for detecting the temperature of the hot water returning to the hot water storage tank 2 at the time of the immediate hot water.

  With reference to FIG. 5, a method for calculating the hot water circulation operation time will be described. First, the control unit 7 determines whether or not to measure the hot water circulation operation time (S1). When measuring the instant hot water circulation operation time (Yes in S1), the control unit 7 starts the instant hot water circulation operation (S2), and substitutes 0 for the measurement time t to initialize the measurement time t of the timer. (S3). When the measurement time t is initialized, the measurement of the immediate hot water circulation operation time by the timer is started.

  Next, the control unit 7 compares the hot water temperature detected by the first temperature sensor and the hot water return temperature detected by the second temperature sensor, so that the temperature between the hot water temperature and the quick hot water return temperature is compared. It is determined whether or not the difference is smaller than 5 ° C. (S4). When the temperature difference is smaller than 5 ° C. (Yes in S4), the control unit 7 determines whether or not the temperature change of the hot water return temperature in the past 5 seconds is 1 ° C. or less (S5). When the temperature difference is 1 ° C. or less (Yes in S5), the control unit 7 stops the immediate hot water circulation operation and ends the measurement of the immediate hot water circulation operation time by the timer (S6). In this state, the value of the product of the measurement time t and 0.55 is substituted into the immediate hot water circulation operation time, and the immediate hot water circulation operation time is stored (S7).

  In S4, when the temperature difference is not smaller than 5 ° C. (No in S4), the control unit 7 determines whether or not the measurement time t has exceeded 450 s (S8). When the measurement time t exceeds 450 s (Yes in S8), the control unit 7 proceeds to the process of S6. When the measurement time t does not exceed 450 s in S8 (No in S8), the control unit 7 returns to the process of S4. In S5, when the temperature change of the hot water return temperature in the past 5 seconds is not 1 ° C. or less (No in S5), the control unit 7 proceeds to the process of S8. In this way, the hot water circulation operation time is obtained.

  The hot water circulation operation time varies depending on the length and thickness of the hot water supply pipe such as the high temperature hot water supply pipe 10. For this reason, the hot water circulation operation time is obtained in advance as described above, so that the hot water circulation operation is performed at the optimal timing when the hot water is required. Therefore, useless loss of heat can be minimized.

  In the hot water storage type hot water supply system 1a according to the first modification, a time at which the hot water is required is set in advance based on the hot water circulation operation time, and the hot water can be performed at the set hot water time. A timer function as described above may be provided. The timer function will be described with reference to FIG. First, the control unit 7 sets an immediate hot water time in advance based on the immediate hot water circulation operation time (S1). Thereby, the control part 7 sets and memorize | stores the time which subtracted the immediate hot water circulation operation time from the immediate hot water time as the time which starts an immediate hot water circulation operation. Thereafter, when the current time becomes the instant hot water circulation operation time (Yes in S2), the control unit 7 performs the instant hot water circulation operation once (S3). With this one-time hot water circulation operation, the hot water temperature in the high-temperature tap piping 10 reaches a predetermined temperature, and the hot water can be immediately used at the time of the hot water. Thus, the hot water circulation operation is automatically performed by the timer function.

  According to the hot water storage hot water supply system 1a having such a timer function, the immediate hot water circulation operation time is set in advance together with the immediate hot water circulation time based on the immediate hot water circulation operation time. be able to.

  Next, a second modification of the hot water storage type hot water supply system 1 will be described with reference to FIG. In the hot water storage type hot water supply system 1b according to this modification, instead of the human sensor 25 of the hot water storage type hot water supply system 1, an input means for inputting a signal for starting an immediate hot water circulation operation is provided. As the input means, there are used a switch 26, a physical sensor 27, a remote controller 23 which is manually operated, and the like which are operated in relation to a change in environment including a user near the hot water terminal. The user of the hot water storage type hot water supply system 1b can arbitrarily select these input means depending on the type of business and usage of the store. For example, in a beauty salon, when a light sensor or a pressure sensor senses that a customer is sitting on a chair in front of a shower serving as a hot water terminal, an immediate hot water circulation operation start signal is transmitted to the control unit 7. Also, when the hot spring terminal is a dishwasher at a restaurant, an optical sensor is placed in the dishwashing space, and when the optical sensor detects that a person has come, the immediate hot water circulation operation start signal is controlled. Send to part 7.

  According to such a hot water storage type hot water supply system 1b, since the dedicated input means for starting the immediate hot water circulation operation is not provided, the user can select the optimum input means. Therefore, it is possible to construct a hot water storage type hot water supply system that can easily take the timing for inputting the start signal.

  In addition, the hot water storage type hot water supply system 1 and the hot water storage type hot water supply system 1b may have a timer function similarly to the hot water storage type hot water supply system 1a. In this case, the hot water can be performed at the time of the hot water as described above.

  The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention. For example, although an optical sensor and a pressure sensor are shown as examples of the physical sensor 27 as the input means, various sensors such as an ultrasonic sensor, a capacitive sensor, and a magnetic sensor can be used. Further, in the above description, the remote controller 23 is shown as means for storing and displaying the time required to substantially shift to the hot water circulation operation, but various display devices other than the remote controller 23 can be used. In addition, in the above, it has been shown that the hot water circulation operation is performed in which the hot water temperature in the high temperature hot water piping 10 is maintained at a high temperature using the immediate hot water piping 12, but in the mixed hot water piping 11 using the intermediate temperature branch pipe 19. An immediate hot water circulation operation for keeping the hot water temperature at a high temperature may be performed. Moreover, the hot water storage tank 2 may be comprised from two or more. Furthermore, instead of the heat pump 3, a water heater using a combustion type or other heat source may be used.

1 Hot water storage type hot water supply system 2 Hot water storage tank 5 Hot water tap (hot spring terminal)
6 Mixing tap (hot spring terminal)
7 Control unit (means to set and store)
8 Feeding pipe 9 Returning pipe 10 High temperature hot water supply pipe 23 Remote control (Means to display and input, input means)
25 Human sensor (input means)
26 switch (input means)
27 Physical sensor (input means)

Claims (4)

In a hot water storage hot water supply system that includes a hot water storage tank and a hot water terminal that discharges hot water from the hot water storage tank through a pipe, and performs an immediate hot water circulation operation for immediately discharging high temperature hot water at a predetermined temperature from the hot water terminal,
Based on a signal input regardless of water temperature in the pipe have a control unit to initiate an immediate hot water circulation operation,
A hot water storage type hot water supply system further comprising means for previously obtaining a time required to substantially shift to the immediate hot water circulation operation and storing and displaying the time .   The hot water storage hot water supply system according to claim 1, wherein the signal is input to the control unit from the outside by a user operation or by detecting the presence of the user. It further comprises input means for inputting the signal to the control unit,
The hot water storage hot water supply system according to claim 2, wherein the input means is a switch or a sensor that operates in association with a change in environment including a user near a hot water terminal . The hot water storage hot water supply system according to claim 2 or 3 , further comprising means for presetting and storing a time at which the hot water circulation operation is performed .

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