JP2010084959A - Storage type hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type hot water supply system free from excess heat storage and preventing a user from having a feeling of anxiety about the run-out of hot water. <P>SOLUTION: In this storage type hot water supply system including a hot water storage tank 1, a display section 31 of an operating device 5 has a first heat storage display for comparably displaying an available heat storage capacity (display of full storage state) of the hot water storage tank 1 and an actual heat storage amount, and a second heat storage display for comparably displaying a target heat storage amount and the actual heat storage amount, and these are alternately switched to be displayed. Thus, an actual heat storage amount can be compared with both the available heat storage capacity and the target heat storage amount, and the anxiety about the unexpected run-out of hot water can be prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat storage type hot water supply system, and more particularly to a heat storage type hot water supply system including a heat storage tank for storing hot water.

  Conventionally, in this type of hot water supply system, display means for displaying the heat storage amount in the heat storage tank is provided, and the user (user) recognizes the heat storage amount in the heat storage tank by visually recognizing the display means. In the case where the remaining heat storage amount in the heat storage tank is small, the heating means is operated by manual operation so that the hot water in the heat storage tank can be heated (see, for example, Patent Document 1). .

Japanese Patent No. 3855938

  By the way, the temperature (heat storage amount) control of the hot water in the heat storage tank in such a hot water supply system is performed based on the learning function of the control means. That is, the control means monitors the daily use of hot water, sets the necessary heat storage amount (learning value) based on the monitoring result, and appropriately adjusts the remaining heat storage amount in the heat storage tank to at least exceed the learning value. Control is performed to increase the boiling of the heat storage tank.

  However, in a hot water supply system having such a learning function, there is a case where the stored heat amount set as the learning value is small and the remaining heat amount in the heat storage tank is small. A user who visually recognizes the amount of stored heat may increase boiling by manual operation because he is worried about running out of hot water (insufficient amount of remaining hot water). Such a boiling-up operation is to store more heat than necessary in the heat storage tank, which is a cause of wasteful energy consumption by the heating means.

  The present invention has been made in view of such problems, and the object of the present invention is to provide a regenerative hot water supply that does not cause excessive heat accumulation and does not cause the user to feel uneasy about running out of hot water. To provide a system.

  In order to achieve the above object, a heat storage type hot water supply system according to the present invention comprises a display means for displaying a target heat storage amount and an actual heat storage amount in the heat storage tank so as to be able to be compared in a heat storage type hot water supply system provided with a heat storage tank. It is characterized by having.

  That is, in the heat storage type hot water supply system of the present invention, the display means is configured to display the target heat storage amount and the actual heat storage amount in the heat storage tank so as to be able to be compared with each other. It is possible to easily grasp how much the actual heat storage amount is relative to the target heat storage amount (in other words, whether there is a sufficient heat storage amount necessary for hot water supply or the like). Therefore, for example, even if the actual heat storage amount of the heat storage tank is less than the heat storage capacity of the heat storage tank (so-called full storage state display), if the value is close to the target heat storage amount, the user is worried about running out of hot water. And wasteful energy consumption can be suppressed.

  And the thermal storage type hot-water supply system of this invention is the learning value set by the learning function with which the said target thermal storage amount is provided as a suitable embodiment.

  That is, in this embodiment, since the learning value set by the learning function provided in the control means is used as the target heat storage amount, the user sets the heat storage amount (learning value) in which the actual heat storage amount is set by the learning function. You can easily grasp whether it exceeds the limit. Therefore, for example, during normal use within a range predicted by the learning function (when only hot water supply operation similar to daily life is performed), the user can be prevented from worrying about unnecessary hot water shortage.

  As another preferred embodiment, the present invention provides a first display mode in which the display means displays the heat storage capacity of the heat storage tank and the actual heat storage amount in a comparable manner, the target heat storage amount and the actual heat storage amount. The second display mode for displaying the amount of stored heat so as to be comparable can be switched between and displayed.

  That is, in this embodiment, the display means displays the first heat storage capacity of the heat storage tank (so-called full storage state display) and the actual heat storage amount so as to be comparable, the target heat storage amount and the actual heat storage amount. It has two display modes of the second display mode that displays the quantity in a comparable manner, and is configured to be able to switch between the two display modes. By switching the display between these display modes, the actual heat storage Since the amount can be compared with both the heat storage capacity and the target heat storage amount, the heat storage amount of the heat storage tank can be grasped more accurately. Therefore, even in this embodiment, the user can be prevented from worrying about unnecessary hot water shortages.

  As another preferred embodiment, the present invention is provided with instruction operation means for adding the heat storage amount to the heat storage tank, and the instruction operation means inputs an instruction for adding the heat storage amount. On the condition that the display means can display the target heat storage amount and the actual heat storage amount. And in this embodiment, when the input operation of the additional heat storage amount is input by the instruction operation means and the target heat storage amount and the actual heat storage amount are displayed to be comparable, the target heat storage amount is displayed. When the ratio of the actual heat storage amount with respect to is greater than or equal to a predetermined value, a predetermined confirmation operation is required.

  That is, in this embodiment, when a heat storage amount addition instruction is input by the instruction operation unit for adding the heat storage amount to the heat storage tank, the display unit can display the target heat storage amount and the actual heat storage amount in a contrastable manner. Therefore, when operating the instruction operation means, the user can check how much the actual heat storage amount is with respect to the target heat storage amount. Therefore, for example, when the actual heat storage amount exceeds the target heat storage amount, it is possible to take measures such as canceling the additional instruction for the heat storage amount, and to suppress wasteful energy consumption. Can do. In addition, when the target heat storage amount and the actual heat storage amount are displayed so as to be comparable in accordance with the operation of the instruction operation means, a predetermined confirmation is made when the ratio of the actual heat storage amount to the target heat storage amount is equal to or greater than a predetermined value. By configuring so as to require an operation, for example, by preventing the control means from accepting an operation for adding a heat storage amount unless this confirmation operation is performed, an unnecessary heat storage amount is added. You can prevent it from being broken.

  As another preferred embodiment, the present invention is characterized in that the display means expresses at least the target heat storage amount and the actual heat storage amount by a figure imitating a heat storage tank.

  In other words, by expressing the target heat storage amount and the actual heat storage amount with a figure simulating a heat storage tank, the user can intuitively recognize the relationship between the target heat storage amount and the actual heat storage amount, and the user can use it. The effect of preventing worrying about running out of hot water can be more effectively achieved.

  According to the heat storage type hot water supply system of the present invention, in the heat storage type hot water supply system provided with the heat storage tank, the user is provided with display means for displaying the target heat storage amount and the actual heat storage amount in the heat storage tank so as to be comparable. By visually recognizing the display means, it is possible to easily grasp how much the actual heat storage amount of the heat storage tank is relative to the target heat storage amount, and it is possible to prevent useless worry about running out of hot water and useless energy Consumption can be suppressed.

  In addition, the display means displays a first display mode in which the heat storage capacity of the heat storage tank and the actual heat storage amount can be compared, and a second display mode in which the target heat storage amount and the actual heat storage amount are displayed in a comparable manner. By switching between these displays, the user can accurately grasp the amount of heat stored in the heat storage tank by switching between these displays, and more worrying about unnecessary hot water runs out. Can be prevented.

  Furthermore, on the condition that an instruction for adding heat storage amount has been input by the instruction operation means for adding the heat storage amount to the heat storage tank, a display capable of comparing the target heat storage amount and the actual heat storage amount on the display means If the ratio of the actual heat storage amount to the target heat storage amount is greater than or equal to a predetermined value, a predetermined confirmation can be made. By requesting the operation, it is possible to prevent an unnecessary amount of heat storage from being added.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
Embodiment 1
FIG. 1 is a schematic configuration diagram showing an example of a regenerative hot water supply system to which the present invention is applied, and FIG. 2 is an explanatory diagram showing an example of a display mode of display means in the regenerative hot water supply system.

  Here, the regenerative hot water supply system shown in FIG. 1 is a hot water supply system of a type that includes a hot water storage tank that stores hot water as a heat storage tank, and uses exhaust heat from a gas engine or the like to boil hot water in the hot water storage tank. Yes, as shown in the figure, a hot water storage tank 1, a heat exchanger 2 for exhaust heat recovery, and an auxiliary heat source device 3 for hot water supply are provided as main parts, and the control means 4 of the hot water supply system and the control means 4 and an operation device 5 for giving an operation command to the operation device 4. In the figure, 6 indicates a water supply pipe for introducing water from a water source, and 7 indicates a hot water supply pipe for introducing hot water discharged from the system into a hot water tap (not shown).

  The hot water storage tank 1 is a known heat storage tank that stores hot water while forming temperature stratification in the tank. As shown in the figure, the hot water storage tank 1 includes a plurality of hot water storage tanks 1 in the height direction (in the illustrated example). Four) temperature sensors 11a to 11d are provided. These temperature sensors 11a to 11d function as detection means for detecting the temperature of the hot water in the hot water storage tank 1, respectively, and also store the amount of heat stored in the hot water storage tank 1, that is, hot water in a predetermined temperature range or higher. It functions as a remaining hot water amount detecting means for detecting the remaining amount (remaining hot water amount). That is, these temperature sensors 11a to 11d are arranged in the height direction of the hot water storage tank 1, so that the control means 4 can monitor the temperature stratification state of the hot water formed in the hot water storage tank 1. Yes.

  Further, the top and bottom of the hot water storage tank 1 are provided with connection parts (a top connection part 12 at the top and a bottom connection part 13 at the bottom) for connecting various pipes to be described later and the hot water storage tank 1. The hot water is allowed to flow into and out of the hot water storage tank 1 through these connecting portions 12 and 13.

  Specifically, the top connection portion 12 includes a mixing valve hot water side flow path 14 for introducing hot water stored in the hot water storage tank 1 into a hot water mixing valve 8 described later, and heat exchange for the recovery of exhaust heat. A heating return flow path 15 for introducing hot water heated by the vessel 2 into the hot water storage tank 1 is connected. On the other hand, the bottom connection portion 13 is connected to a storage water supply flow channel 16 branched from the water supply pipe 6 and a heating forward flow channel 17 for introducing hot water for heating into the heat exchanger 2. Yes.

  The heat exchanger 2 for exhaust heat recovery is a heating means for generating hot water using exhaust heat generated by a gas engine (not shown). As described above, the heat exchanger 2 is It is connected to the hot water storage tank 1 and piping (through a flow path). Specifically, the heating forward flow path 17 and the heating return flow path 15 are connected to the heat exchanger 2. The heating flow path 17 is provided with a circulation pump 20 for forcibly circulating hot water and a temperature sensor 21 for detecting the temperature of hot water introduced into the heat exchanger 2. The circulation pump 20 may be provided on the heating return flow path 15 side.

  The start / stop of the heating operation by the heat exchanger 2 is controlled by the control means 4. That is, in the present embodiment, the heat exchanger 2 is configured as a heat exchanger that recovers exhaust heat from a gas engine or the like. Therefore, when the heating operation is performed by the heat exchanger 2, the control means 4 Is configured to control to drive a heat source such as a gas engine.

  The auxiliary heat source unit 3 for hot water supply is a hot water supply device connected to the hot water mixing valve 8 via the hot water supply flow path 18, and the hot water is supplied when the temperature of the hot water supplied from the hot water mixing valve 8 is low. It is an auxiliary hot water supply apparatus used to raise the temperature to a desired temperature. This hot water supply apparatus is composed of a combustion heating type hot water heater of a known mode using gas or oil as fuel, and a control unit (not shown) of this auxiliary heat source unit 3 is connected in communication with the control means 4. The above-described auxiliary operation is performed by receiving control by the control means 4.

  Here, in the hot water / water mixing valve 8, the mixed valve hot water side flow path 14 and the hot water supply flow path 18 are connected to two of the three ports, and the other one port is branched from the water supply pipe 6. Further, it is constituted by a three-way valve to which a hot water supply water supply channel 19 is connected. The hot water supply passage 18 is connected to the water inlet pipe 3 a of the auxiliary heat source unit 3, and the hot water outlet pipe 3 b of the auxiliary heat source unit 3 is connected to the hot water supply pipe 7. The hot water supply passage 18 is provided with a temperature sensor 22 for detecting the temperature of water entering the auxiliary heat source unit 3, and the hot water supply pipe 7 is provided with a flow rate control valve 23 and a temperature sensor 24 for detecting the hot water supply temperature. Yes. Furthermore, a temperature sensor 25 for detecting the temperature of the water supplied from the water supply pipe 6 is provided in the hot water supply water supply channel 19. In the figure, reference numerals 26 to 28 denote check valves that prevent backflow to the water supply pipe 6.

  The said control means 4 is a control apparatus for controlling the whole hot-water supply system, and has a microcomputer provided with various programs and data for control. And this control means 4 controls operation | movement of each part of a hot water supply system based on the control signal given from the operating device 5 mentioned later, the detection signal from various sensors mentioned above, etc., and the state of the hot water supply system mentioned above variously Monitoring is performed based on detection signals from the sensors, and the state of the hot water supply system can be displayed on the display unit 31 of the operation device 5 described later (details will be described later).

  The operation device 5 is an operation device for giving an operation command to the control means 4, that is, a remote controller of the hot water supply system, and an operation unit 30 for inputting various operation commands to the hot water supply system, and the control means. 4 is configured with a remote controller of a known mode provided with a display unit (display means) 31 for displaying the state of the hot water supply system based on communication with the main unit as a main part. For example, the operation device 5 is disposed at a suitable place where the user can easily use such as a kitchen or a living room, and is connected to the control means 4 by wired or wireless communication.

  As the display unit 31 in the operation device 5, a display device capable of displaying characters and figures such as a liquid crystal display panel and a fluorescent display tube is used so that a heat storage display described later can be displayed with good visibility.

  Next, the operation of the hot water supply system configured as described above will be described. This hot water supply system has a hot water storage mode and a hot water supply mode for its operation, and the control means 4 performs the following operation control in each operation mode.

A. Hot Water Storage Mode The hot water storage mode is an operation mode for boiling hot water in the hot water storage tank 1 using exhaust heat from a gas engine or the like. When the hot water supply system operates in the hot water storage mode, the control unit 4 activates a gas engine or the like serving as a heat source of the heat exchanger 2 so that the heat exchanger 2 can recover exhaust heat.

  Then, in this state, the circulation pump 20 is operated to cause forced circulation in the heating forward flow path 17, whereby low-temperature hot water stored in the bottom of the hot water storage tank 1 (temperature stratification in the hot water storage tank 1 causes the tank to Low temperature hot water is stored at the bottom) from the bottom connection part 13 to the heating forward flow path 17, heated by the heat exchanger 2, heated, and stored via the heating return flow path 15 and the top connection part 12. It is introduced into the upper part of the tank 1. Thereby, the heated hot water is introduced into the upper part of the hot water storage tank 1, and the hot water in the hot water storage tank 1 is gradually heated.

  Here, the hot water storage mode can be executed automatically by the control means 4 or by manual operation of the operation unit 30 of the operation device 5.

  The automatic hot water storage mode is performed as follows. In other words, the control means 4 is provided with a learning function for learning the state of implementation of the hot water supply operation (the usage state of the thermal load) in the hot water supply system. Based on this learning function, the hot water storage during the hot water supply (when the thermal load is used) The control means 4 appropriately executes the hot water storage mode so as not to cause a so-called hot water shortage in which the hot water in the tank 1 is insufficient.

  In this automatically performed hot water storage mode, the control means 4 sets a target heat storage amount of the hot water storage tank 1 (specifically, a target hot water amount in the hot water storage tank 1) based on the learning function, and this set value (learning) The hot water storage mode is continued until the value reaches (value) and the boiling in the hot water storage tank 1 is increased. During this time, the control means 4 monitors the detection signals of the temperature sensors 11a to 11d and cancels the hot water storage mode when hot water (remaining hot water amount) corresponding to the target heat storage amount is stored in the hot water storage tank 1. Therefore, according to this automatically performed hot water storage mode, hot water required based on the learning function is stored in the hot water storage tank 1 in the hot water storage tank 1. When the hot water storage mode is canceled, the circulation pump 20 is stopped, and the forced circulation in the heating forward flow path 17 is also stopped.

  In addition, as a learning function of the usage condition of a heat load, the same learning function as the learning function used in the conventional hot water storage type hot water supply system is preferably used. For example, a method is adopted in which the control unit 4 monitors and stores the usage status of the thermal load over a predetermined period, and the control unit 4 assumes the usage status of the thermal load for one day based on the data. And the setting of the said target heat storage amount is set so that the amount of remaining hot water of the quantity which can use the heat load of the day assumed in this learning function is stored in the hot water storage tank 1. FIG.

  On the other hand, the hot water storage mode by manual operation is started when a predetermined operation for instructing execution of the hot water storage mode is performed in the operation unit 30 provided in the operation device 5. That is, the operation unit 30 is provided with instruction operation means (for example, an operation switch for instructing the start of hot water storage) for adding a predetermined amount of heat storage amount (remaining hot water amount) of the hot water storage tank 1. When the operation is performed, the hot water storage mode is forcibly started. This hot water storage mode by manual operation can be set so as to increase the amount of remaining hot water by a fixed amount, and the hot water storage tank 1 is fully stored (that is, the hot water storage tank 1 is filled with hot water). It can be set to keep the hot water storage mode.

  In relation to the hot water storage mode by manual operation, the display unit 31 of the operation device 5 displays the heat storage capacity (heat storage amount in the fully stored state) of the hot water storage tank 1 and the actual heat storage amount so as to be comparable. Has been. FIG. 2A shows an example of the heat storage amount display. The heat storage amount display shown in FIG. 2 (a) is obtained by converting the heat storage capacity and the actual heat storage amount into the remaining amount of hot water (remaining hot water amount) in the hot water storage tank 1, and specifically, A heat storage capacity is displayed by a plurality of frames 42 (six frames 42a to 42f in the illustrated example) in a substantially rectangular frame 41 that is similar to a hot water storage tank and is represented by a solid line. The frames corresponding to the remaining hot water amount corresponding to the amount (three frames of the frames 42a to 42c in the illustrated example) are highlighted (for example, only the corresponding frame is displayed in black as illustrated, or only the corresponding frame is blinked, etc.) , It is displayed differently from other frames).

B. Hot Water Supply Mode The hot water supply mode is an operation mode for performing hot water supply using hot water stored in the hot water storage tank 1. When the hot water supply system operates in this hot water supply mode, the control means 4 opens all three ports of the hot and cold water mixing valve 8.

  In this state, when low-temperature water is introduced from the water supply pipe 6 by opening a tap (not shown) or the like, a part of the low-temperature water is stored in the storage water supply channel 16 and the bottom connection portion 13. Through the bottom of the hot water storage tank 1. Along with this, hot hot water stored in the upper part of the hot water storage tank 1 is pushed out and introduced into the hot water input port of the hot water mixing valve 8 via the top connection part 12 and the mixing valve hot water side flow path 14. On the other hand, the remainder of the low-temperature water introduced from the water supply pipe 6 is introduced into the cold water input port of the hot water mixing valve 8 through the hot water supply water supply channel 19. In this way, hot water and cold water (cold water) are introduced into the hot water input port and the cold water input port of the hot water mixing valve 8 and mixed by the hot water mixing valve 8.

  At this time, the control means 4 detects the temperature of the hot water flowing through the hot water supply flow path 18 with the temperature sensor 22, and when this temperature is equal to the hot water set temperature (scheduled hot water temperature from the hot water tap), the auxiliary heat source machine The hot water flowing through the hot water supply flow path 18 is discharged from the hot water supply pipe 7 as it is without operating 3. On the other hand, when the temperature detected by the temperature sensor 18 is lower than the hot water supply set temperature, the control means 4 operates the auxiliary heat source unit 3 and the temperature of hot water discharged from the hot water supply pipe 7 (by the temperature sensor 24). The detected temperature is set to the hot water supply set temperature.

  By the way, in the hot water supply system comprised in this way, in this invention, on the display part 31 of the operating device 5, the heat storage amount display which displays the heat storage possible capacity | capacitance of the hot water storage tank 1 mentioned above and actual heat storage amount so that a comparison is possible ( Hereinafter, this is referred to as “first heat storage display”), and separately from the target heat storage amount in the hot water storage tank 1 and the actual heat storage amount, the heat storage amount display (hereinafter referred to as “second heat storage display”). The display is called “display”). In other words, the display unit 31 of the controller device 5 includes a first display mode that displays the first heat storage display and a second display mode that displays the second heat storage display.

  FIG. 2B shows an example of the second heat storage amount display. As shown in the figure, this second heat storage display shows a target heat storage amount in a substantially rectangular frame 43 that is represented by a broken line, imitating a hot water storage tank, and a plurality of frames 44 (six frames 44a to 44f in the illustrated example). With respect to this target heat storage amount, the frames corresponding to the remaining hot water amount corresponding to the actual heat storage amount (in the illustrated example, 5 frames of frames 44a to 44e) are displayed in reverse (for example, only the corresponding frame is illustrated in the drawing (Displayed differently from other frames, such as displaying black on the screen or blinking only the frame).

  The second heat storage display can be configured to be displayed on the display unit 31 simultaneously with the first heat storage display (in parallel with the first heat storage display). 1 is configured to switch between the two heat storage displays.

  For example, when the first heat storage display is normally displayed on the display unit 31 and a predetermined operation requesting the second heat storage display is performed on the operation unit 30 of the operation device 5, the control of the operation device 5 is performed. The unit (not shown) stops the first heat storage display, and displays the second heat storage display instead of the first heat storage display (in the place where the first heat storage display was made). Composed. Thus, in this embodiment, since the 2nd heat storage display is constituted so that it may be displayed using the display part of the 1st heat storage display, the display mode is the same as the 1st heat storage display. A display mode (specifically, a mode in which a plurality of frames are displayed in a frame imitating a hot water storage tank) is preferably employed. As a result, the second heat storage display can be performed by slightly modifying the display program of the display unit 31. That is, it is possible to apply the present invention without requiring significant modification of the display program or change of the display device.

  In addition, in the 2nd heat storage display shown in FIG.2 (b), although the frame 43 imitating the hot water storage tank 1 is displayed with a broken line so that it may not be mistaken for the 1st heat storage display mentioned above, If the second heat storage display uses the display form of the first heat storage display, for example, as shown in FIGS. 3 (a) and 3 (b), the heat storage capacity is also displayed. You can also Specifically, in FIG. 3A, the heat storage capacity is expressed by the frames 44a to 44f in the frame 43 as in the first heat storage display, and a broken line is displayed at a position corresponding to the target heat storage amount. (In the illustrated example, it is displayed between the frames 44c and 44d), and the frames corresponding to the remaining hot water amount corresponding to the actual heat storage amount (three frames of the frames 44a to 44c in the illustrated example) are highlighted. Further, in FIG. 3 (b), as in FIG. 3 (a), the portion (range) 45 corresponding to the heat storage amount corresponding to the target heat storage amount is specified while expressing the heat storage capacity with the frames 44a to 44f. Colors are used for display (indicated by shading in the illustrated example), and frames corresponding to the amount of remaining hot water corresponding to the actual heat storage amount (in the illustrated example, three frames 44a to 44c) are highlighted. In short, in the second heat storage display, at least the target heat storage amount in the hot water storage tank 1 and the actual heat storage amount may be displayed so as to be comparable.

  Thus, in the hot water supply system shown in the present embodiment, the first display mode in which the display unit 31 of the controller device 5 displays the first heat storage display, and the second display mode in which the second heat storage display is displayed. Since these can be switched to each other and displayed, for example, even when the actual heat storage amount is smaller than the heat storage capacity, the user can visually check the second heat storage display to achieve the target. The actual heat storage amount can be grasped in relation to the heat storage amount. Therefore, when the actual heat storage amount is sufficient with respect to the target heat storage amount, there is no need to worry about running out of hot water, and it is possible to prevent the manual operation from shifting to an unnecessary hot water storage mode. It will be possible to eliminate the heat storage.

Embodiment 2
Next, a second embodiment of the hot water supply system according to the present invention will be described with reference to FIG.

  That is, in the hot water supply system shown in the second embodiment, the hot water supply system shown in the first embodiment described above may be switched to the hot water storage mode by a manual operation without visually recognizing the second heat storage display. For this reason, the second heat storage display is forcibly performed when switching to the hot water storage mode by manual operation. Since the basic configuration of the other hot water supply system is the same as that of the hot water supply system shown in the first embodiment described above, the same reference numerals are given to portions having the same configuration, and description thereof is omitted.

  FIG. 4 is a flowchart showing an operation procedure in the second embodiment. As shown in FIG. 4, in the hot water supply system shown in the present embodiment, the operation switch of the hot water supply system is turned on, and the system is in a normal state (manual operation for shifting to the hot water storage mode is performed). In the absence state), the first heat storage display is displayed on the display unit 31 of the controller device 5 (see step S1 in FIG. 4).

  In this state, when the user performs an operation for shifting to the hot water storage mode by manual operation of the operation unit 30 (operation of the instruction operation unit) (Yes in step S2 in FIG. 4), the operation device 5 that has accepted this operation. The control unit (not shown) causes the display unit 31 to display the second heat storage display (see step S3 in FIG. 4). When the operation for shifting to the hot water storage mode is not performed by manual operation, the control unit of the controller device 5 continues monitoring whether or not there is the manual operation in a state where the first heat storage display is displayed (FIG. 4). Step S2).

  On the other hand, when the operation for shifting to the hot water storage mode is performed by manual operation and the second heat storage display is displayed on the display unit 31, the control unit of the controller device 5 next displays the ratio of the actual heat storage amount to the target heat storage amount. Is greater than or equal to a predetermined value (see step S4 in FIG. 4). That is, it is determined whether or not the actual heat storage amount is larger than a value obtained by multiplying the target heat storage amount by a constant value α.

  Here, since the constant value α functions as a threshold value for requesting a confirmation operation described later, if this value is too small or too large, the meaning of requesting the confirmation operation is diminished. Therefore, it is preferable to set the constant value α to a value close to 1 (for example, a range of about 0.5 <α ≦ 1). Further, this determination can be configured to be performed by the control unit of the controller device 5, or can be configured to be determined by the control means 4 and acquired by the control unit of the controller device 5.

  As a result of the determination in step S4 in FIG. 4, when the actual heat storage amount is large, that is, “target heat storage amount × α <actual heat storage amount” (Yes in step S4 in FIG. 4), the transition to the hot water storage mode is performed. Since it should not be necessary, a display requesting predetermined confirmation is displayed on the display unit 31 (see step S5 in FIG. 4). The display requesting this confirmation is a display for prompting the user to reconsider the transition to the hot water storage mode. This display can be simply displayed to prompt the user to reconsider, but for example, a predetermined confirmation operation (such as “Currently enough hot water is stored. Do you want to store additional hot water?”) A predetermined operation of the operation unit 30 can be requested. The present embodiment is configured to request such a predetermined confirmation operation.

  Only when this confirmation operation is performed (Yes in step S6 in FIG. 4), the operation unit 31 transmits a control signal instructing the control means 4 to shift to the hot water storage mode (see step S7 in FIG. 4). ). That is, in this embodiment, even if an operation for switching to the hot water storage mode is performed by manual operation of the operation unit 30, the control unit 4 maintains the hot water supply mode without shifting to the hot water storage mode unless this confirmation operation is performed. It is configured as follows. Therefore, in the present embodiment, when the actual heat storage amount is sufficient with respect to the target heat storage amount, even if the user inadvertently performs the operation of switching to the hot water storage mode, the hot water storage mode is not immediately shifted, so that wasted energy Consumption can be suppressed. In particular, since the gas engine has a property that once it is started, it takes time to stop, so when the gas engine is used as a heat source of the heat exchanger 2, a confirmation operation is required as in this embodiment. By doing so, there is an advantage that it is possible to avoid useless activation of the gas engine.

  On the other hand, when this confirmation operation is not performed, in this embodiment, the display that returns to step S5 in FIG. 4 and requests the confirmation operation is continued. For example, this confirmation operation is not performed within a certain time. In such a case, the controller of the controller device 5 can be configured to cancel the operation for shifting to the hot water storage mode and return to step S1 in FIG. In addition, when canceling the transition operation to the hot water storage mode in this way, it is desirable to display the fact on the display unit 31 to alert the user.

  On the other hand, as a result of the determination in step S4 in FIG. 4, when the actual heat storage amount is not large, that is, “target heat storage amount × α ≧ actual heat storage amount” (in the case of No in step S4 in FIG. 4), Since there is a risk of running out of hot water unless the mode is changed to the hot water storage mode, in this case, the control unit of the operating device 5 moves to step S7 in FIG. A control signal for instructing is transmitted. Thereby, the control means 4 shifts to the hot water storage mode and the boiling of the hot water storage tank 1 is started.

  Thus, in the hot water supply system of the present embodiment, when the user performs an operation for instructing the shift to the hot water storage mode by a manual operation, the actual heat storage amount of the hot water storage tank 1 is greater than or equal to a predetermined ratio with respect to the target heat storage amount. Depending on the result, it is determined whether or not to enter the hot water storage mode, and if necessary, a confirmation operation for confirming the transition to the hot water storage mode is required. Transition to the hot water storage mode is suppressed.

  In the present embodiment, the confirmation operation is requested when the actual heat storage amount is sufficient with respect to the target heat storage amount. For example, the control means 4 is switched to the hot water storage mode without requesting the confirmation operation. It is also possible to transmit a control signal instructing the shift of the display, and to cause the display unit 31 to perform only the second heat storage display and to alert the user by this display. In that case, it is preferable that the user who visually recognizes the second heat storage display can cancel the hot water storage mode by manual operation.

  Note that the above-described embodiments merely show preferred embodiments of the present invention, and the present invention is not limited to these, and various design changes can be made within the scope thereof.

  For example, in the above-described embodiment, the case where the heat storage amount of the hot water storage tank 1 is displayed as the remaining hot water amount is shown. However, for example, in a hot water supply system in which the hot water storage tank 1 does not form a temperature stratification, It can also comprise so that it may display using the temperature of the hot water in the hot water storage tank 1 as a heat storage amount of the tank 1. FIG.

  In relation to this, the hot water storage method for the hot water storage tank 1 includes (a) hot water storage in which a temperature stratification is formed by two layers of high and low temperatures, and (b) the hot water storage tank is heated uniformly. There are various hot water storage methods, such as (c) once the hot water storage tank is heated uniformly at an intermediate temperature and then one layer of high temperature stratification is formed in a part of the hot water storage tank. An example of a method for calculating the current heat storage amount and the target heat storage amount in the case of is as follows.

That is, when hot water storage is performed by forming a temperature stratification with two layers of high temperature and low temperature in the hot water storage tank, the current heat storage amount described above is expressed by the following formula (1) (the first term in the formula (1) is a high temperature): The amount of heat stored in the region, the second term is the amount of heat stored in the low temperature region).
(Th−Tw) · Qh + (TL−Tw) (Q−Qh) (1)
In this formula (1), Th is the temperature of hot water in the high temperature region, TL is the temperature of hot water in the low temperature region, Tw is the incoming water temperature, Q is the total capacity of the hot water storage tank, and Qh is the capacity in the high temperature region. And in this numerical formula (1), when the temperature Th of the hot water in the high temperature region or the temperature TL of the low temperature region is lower than the hot water supply set temperature + 3 ° C., the hot water in the hot water storage tank cannot be used for hot water supply. Therefore, the heat storage amount of the first term or the second term is regarded as zero.
On the other hand, the target heat storage amount is expressed by the following mathematical formula (2).
(Tmax−Tw) · Q · α (2)
In this equation (2), Tw is the incoming water temperature, Q is the total capacity of the hot water storage tank, Tmax is the maximum hot water storage set temperature, and α is a coefficient (0 ≦ α ≦ 1) that changes according to the target heat storage amount.

On the other hand, when the hot water storage tank is heated uniformly to store hot water, the current heat storage amount is expressed by the following formula (3).
Q ・ (T-Tw) (3)
In this mathematical formula (3), T is a uniform hot water storage temperature, Tw is the incoming water temperature, and Q is the total capacity of the hot water storage tank. Even in the case of Equation (3), when the uniform hot water storage temperature T is lower than the hot water supply set temperature + 3 ° C., the hot water in the hot water storage tank cannot be used for hot water supply, so that the heat storage amount is regarded as zero. Is done.
On the other hand, the target heat storage amount is expressed by the following mathematical formula (4).
Q ・ (Ts−Tw) (4)
In the mathematical formula (4), Ts represents a hot water storage set temperature that varies according to the target heat storage amount, Tw represents the incoming water temperature, and Q represents the total capacity of the hot water storage tank.

When the hot water storage tank is once heated uniformly at an intermediate temperature and then one layer of high temperature stratification is formed in a part of the hot water storage tank, the current heat storage amount is expressed by the following formula (5). (In Equation (5), the first term is the amount of heat stored in the high temperature region, and the second term is the amount of heat stored in the medium temperature region).
(Th−Tw) · Qh + (Tm−Tw) (Q−Qh) (5)
In Equation (5), Th is the temperature of hot water in the high temperature region, Tm is the temperature of hot water in the medium temperature region, Tw is the incoming water temperature, Q is the total capacity of the hot water storage tank, and Qh is the capacity in the high temperature region. Also in this formula (5), when the temperature Th of the hot water in the high temperature region or the temperature Tm of the hot water in the intermediate temperature region is lower than the hot water supply set temperature + 3 ° C., the hot water in the hot water storage tank is used for hot water supply. Since this is not possible, the amount of heat stored in the first term or the second term is regarded as zero.
In addition, the target heat storage amount in this case is appropriately set without using a mathematical expression.

  In the above-described embodiment, the heat storage amount (remaining hot water amount) of the hot water storage tank 1 is displayed using a plurality of rectangular pieces 42 and 44. However, the shape of this piece can be appropriately changed in design. Needless to say, it is also possible to configure such that other than the frame, for example, a numerical value is directly displayed, or a graph such as a bar graph or a pie graph is used.

  Further, in the above-described embodiment, the case where the heat exchanger 2 that uses exhaust heat is used as the heating means for the hot water storage tank 1 is shown. For example, a small water heater or an electric heater can be used instead of the exchanger.

  In the hot water supply system described above, the auxiliary heat source unit 3 is shown. However, the present invention is applicable to a hot water supply system that does not have the auxiliary heat source unit 3 as long as the hot water supply system includes the hot water storage tank 1. It is.

  Moreover, although the hot water supply system of the type which utilizes the hot water (hot water) in the hot water storage tank 1 directly for hot water supply was shown in embodiment mentioned above, the heat storage and hot water in a hot water storage tank (heat storage tank) are heat exchangers. The present invention can also be applied to a hot water supply system that heats and supplies hot water by exchanging heat through a hot water supply.

It is a schematic structure figure showing an example of a heat storage type hot-water supply system concerning the present invention. It is explanatory drawing which shows an example of the display mode of the display means in the thermal storage type hot water supply system, and Fig.2 (a) is the 1st thermal storage display which displays the heat storage possible capacity | capacitance of a hot water storage tank, and actual heat storage amount so that comparison is possible. FIG. 2 (b) shows an example of a second heat storage display that displays the target heat storage amount and the actual heat storage amount in the hot water storage tank so that they can be compared. It is explanatory drawing which shows the other Example of the 2nd thermal storage display in the display means of the thermal storage type hot-water supply system. It is a flowchart which shows the operation | movement procedure in 2nd Embodiment of the thermal storage type hot-water supply system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heat exchanger for waste heat recovery 3 Auxiliary heat source machine 4 for hot water supply Control means 5 Operation device 6 Water supply pipe 7 Hot water supply pipe 8 Hot water mixing valve 11a-11d Temperature sensor 12 Top connection part 13 Bottom connection part 20 Circulation Pump 30 operation section (instruction operation means)
31 Display section (display means)

Claims (6)

  A heat storage type hot water supply system provided with a heat storage tank, comprising a display means for displaying the target heat storage amount and the actual heat storage amount in the heat storage tank so as to be comparable.   The regenerative hot water supply system according to claim 1, wherein the target heat storage amount is a learning value set by a learning function provided in the control means.   The display means displays a first display mode in which the heat storage capacity of the heat storage tank and the actual heat storage amount can be compared, and a second display mode in which the target heat storage amount and the actual heat storage amount are displayed in a comparable manner. The regenerative hot water supply system according to claim 1 or 2, characterized in that the display can be switched between and displayed.   Instruction operation means for adding a heat storage amount to the heat storage tank is provided, and on the condition that an instruction to add heat storage amount is input by the instruction operation means, the display means and the target heat storage amount The regenerative hot water supply system according to any one of claims 1 to 3, wherein a display capable of comparing the actual heat storage amount is made.   When the instruction operation means inputs an additional instruction for the heat storage amount and the target heat storage amount and the actual heat storage amount are displayed in a comparable manner, the ratio of the actual heat storage amount to the target heat storage amount is a predetermined value. When it is above, predetermined | prescribed confirmation operation is requested | required, The thermal storage type hot-water supply system of Claim 4 characterized by the above-mentioned.   The regenerative hot water supply system according to any one of claims 1 to 5, wherein the display means expresses at least the target heat storage amount and the actual heat storage amount by a figure imitating a heat storage tank.

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