JP2011149656A - Storage type hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent false recognition of an operating situation by properly displaying a hot water remaining state in a hot water storage tank even when a water supply temperature is comparatively high. <P>SOLUTION: In this storage type hot water supply system including the hot water storage tank 12 for storing hot water heated by a heating means 14, a hot water storage temperature sensor 21 detecting a hot water storage temperature in the hot water storage tank 12, a water supply temperature sensor 31 detecting a water supply temperature to the hot water storage tank 12, a remaining hot water determining means for determining the hot water remaining state in the hot water storage tank 12 on the basis of the hot water storage temperature, and a remaining hot water display section 50 for displaying a result of the determination as the hot water remaining amount in the hot water storage tank, the remaining hot water determining means has control constitution to determine existence of the remaining hot water when the hot water storage temperature is a prescribed heating target temperature or more, and a value obtained by subtracting the water supply temperature from the hot water storage temperature is a prescribed temperature or more, and determine absence of the remaining hot water when the hot water storage temperature is less than the heating target temperature, or the subtraction value is less than the prescribed temperature. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply system capable of supplying hot water using hot water stored in a hot water storage tank.

  In a conventional hot water storage hot water supply system, a hot water storage temperature sensor is provided in the hot water storage tank, the remaining hot water state in the hot water storage tank is determined from the ratio of the detected temperature (hot water storage temperature) to the predetermined heating target temperature, and the remaining hot water display section of the remote control is displayed. What is displayed is known (for example, refer to Patent Document 1).

  In this case, if the hot water in the hot water storage tank is heated by the heating means and the detection temperature of the hot water temperature sensor rises, the displayed value of the remaining hot water state increases accordingly, while the hot water in the hot water storage tank is used, If the temperature of the hot water storage temperature sensor decreases, the display value of the remaining hot water state decreases accordingly, so the user can easily recognize how much hot water remains in the hot water storage tank and how much has been used. .

Japanese Patent Laid-Open No. 2004-360956

  However, in the conventional hot water storage system, the temperature of the water supplied to the hot water storage tank (water supply temperature) is high as in summer, and the difference between the water supply temperature and the hot water storage temperature is relatively small. Since the above ratio does not decrease even if the operation is performed, the display of the amount of remaining hot water in the hot water storage tank does not change, and there is a possibility that the operating status may be misidentified.

  The present invention has been made in view of this point, and an object of the present invention is to appropriately display the amount of remaining hot water even when the feed water temperature is relatively high, and to prevent misidentification of the driving situation.

The hot water storage type hot water supply system according to the present invention is:
A hot water storage tank for storing hot water heated by the heating means, a hot water storage temperature sensor for detecting the hot water storage temperature in the hot water storage tank, a hot water storage temperature sensor for detecting a hot water supply temperature to the hot water storage tank, and a hot water storage tank based on the hot water storage temperature In a hot water storage hot water supply system comprising a remaining hot water determination means for determining the state of remaining hot water in the inside and a remaining hot water display unit for displaying the determination result as the amount of remaining hot water in the hot water storage tank
The remaining hot water determination means determines that there is remaining hot water if the stored hot water temperature is equal to or higher than a predetermined heating target temperature and a value obtained by subtracting the feed water temperature from the hot water temperature is equal to or higher than the predetermined temperature. Alternatively, if the subtracted value is lower than the predetermined temperature, the control configuration is such that it is determined that there is no remaining hot water.

  According to the above configuration, when the hot water storage temperature is equal to or higher than the heating target temperature and the value obtained by subtracting the feed water temperature from the hot water temperature is equal to or higher than the predetermined temperature, a display corresponding to the presence of remaining hot water is performed, and the hot water storage temperature is the heating target temperature. If the value is less than or less than the predetermined temperature, a display corresponding to no remaining hot water is displayed, so the water supply temperature is relatively high as in summer, and the water supply temperature to the hot water storage tank Even under conditions where the difference is relatively small, it is possible to accurately display the remaining hot water amount according to the actual remaining hot water amount in the hot water storage tank.

In the hot water storage type hot water supply system, the hot water storage tank includes a plurality of hot water storage temperature sensors that detect the temperature in the hot water storage tank by dividing it into upper and lower predetermined detection areas,
In the remaining hot water display portion, the amount of the detection area determined to have the remaining hot water is increased, the display value of the remaining hot water amount is increased, and the number of the detection areas determined to have no remaining hot water is increased, It is desirable to have a control configuration in which the displayed value of the remaining hot water amount is reduced.

  In this case, if the number of detection areas determined to have remaining hot water increases, the display value of the remaining hot water amount in the hot water storage tank is increased accordingly, and the number of detection areas determined to have no remaining hot water increases. For this reason, the display value of the remaining hot water amount in the hot water storage tank is reduced accordingly, so that the actual remaining hot water amount in the hot water storage tank can be displayed more accurately.

  Since the present invention has the above configuration, the present invention has the following specific effects.

  Even when the feed water temperature is relatively high, it is possible to appropriately display the state of the remaining hot water in the hot water storage tank, so that it is possible to prevent misidentification of the operation status.

The schematic block diagram of the hot water storage type hot-water supply system which concerns on embodiment of this invention. Schematic of the remote control of the hot water storage type hot water supply system according to the embodiment of the present invention. The operation | movement flowchart which shows the remaining hot water amount display operation | movement of the hot water storage type hot-water supply system which concerns on embodiment of this invention. The operation | movement flowchart which shows the hot water leak detection operation | movement of the hot water storage type hot-water supply system which concerns on embodiment of this invention. The operation | movement flowchart which shows the detection time adjustment operation | movement of the hot water storage type hot-water supply system which concerns on other embodiment of this invention.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, a hot water storage hot water supply system 1 according to an embodiment of the present invention includes a hot water storage tank 12 that stores hot water and an auxiliary heat source that heats hot water sent from the hot water storage tank 12 by the combustion heat of a gas burner 130. , A solar heat collector 14 for recovering solar heat and heating hot water in the hot water storage tank 12, a remote control 15 for remotely operating the hot water storage hot water supply system 1, hot water supply operation and hot water storage by the hot water storage hot water supply system 1 And a control circuit 16 for controlling the operation.

  A hot water supply pipe 17 </ b> A that guides hot water in the hot water storage tank 12 to the auxiliary heat source machine 13 is connected to the upper part of the hot water storage tank 12, while water is guided from the water supply to the hot water storage tank 12 at the bottom of the hot water storage tank 12. A water supply pipe 17B is connected.

  The hot water storage tank 12 includes a plurality (four in this case) of hot water storage temperature sensors 21 that detect the temperature of hot water stored therein. These hot water storage temperature sensors 21 are juxtaposed at equal intervals in the vertical direction with respect to the side wall of the hot water storage tank 12, and the temperature in the hot water storage tank 12 is determined in a predetermined vertical region (here, upper region, middle upper region, middle region). It is configured to detect in a hierarchical manner by dividing it into four areas (lower area and lower area).

  The auxiliary heat source unit 13 includes a hot water supply heat exchanger 131 and a heating heat exchanger 132 that recover the combustion heat of the gas burner 130, and a hot water supply pipe line 17 </ b> A is connected to the inlet of the hot water supply heat exchanger 131. Yes. On the other hand, the outlet of the hot water supply heat exchanger 131 is connected to a hot water supply destination P such as a currant or a shower.

  The heating heat exchanger 132 also has hot water that is heated in the heating heat exchanger 132 (including a heat medium mixed with antifreeze liquid) to the heating device W installed outside the auxiliary heat source unit 13. A circulation line 18 is connected. The auxiliary heat source unit 13 incorporates a circulation pump 133 driven by a commercial power source. By driving the circulation pump 133, the hot water in the heating heat exchanger 132 is circulated to the heater W. It is circulated through the heating circulation line 18A of the line 18.

  The heating heat exchanger 132 is normally used as a heating means for supplying hot water to the heater W. However, when hot water is not stored in the hot water storage tank 12 due to insufficient solar radiation, It is also used as a heating means for reheating the hot water in the hot water storage tank 12 when there is little replacement of hot water and there is a possibility that bacteria such as Legionella bacteria will propagate inside.

  Although not shown, the solar heat collector 14 has a configuration in which a heat collection panel for collecting solar heat and a solar cell panel for converting sunlight into electric power are laminated and integrated, and a heat medium (not shown) formed inside the solar heat collector 14. A heat medium circulation pipe 19 that extends into the hot water storage tank 12 is connected to the passage. The solar cell panel is connected to the control circuit 16 through electric wiring, and the circulation pump 42 described later can be driven by electric power supplied from the solar cell panel to the control circuit 16. .

  The hot water supply pipe 17A has a hot water temperature sensor 22 for detecting the temperature of hot water sent out from the hot water storage tank 12, and is opened when the internal temperature of the hot water storage tank 12 becomes higher than a predetermined pressure, and the hot water in the hot water storage tank 12 is discharged to the outside. A pressure relief valve 23 to be discharged, an electromagnetic valve 24 capable of interrupting the supply of hot water from the hot water storage tank 12 to the hot water supply line 17A, and hot water supplied from the hot water storage tank 12 to the hot water supply line 17A and the water supply line 17B will be described later. A hot water mixing valve 25 that adjusts the mixing ratio with water supplied to the hot water supply pipe 17A via the branch pipe 17C, and a water amount sensor 26 that detects the flow rate of the hot water supply pipe 17A on the downstream side of the hot water mixing valve 25; A mixing temperature sensor 27 for detecting the mixing temperature of hot water and water mixed at a predetermined ratio by the hot water mixing valve 25 is provided in this order from the upstream side (hot water storage tank 12 side). With the opening 24 open, the hot water in the hot water storage tank 12 is adjusted by adjusting the opening of the hot water mixing valve 25 based on the detected temperatures of the hot water temperature sensor 22, the mixed temperature sensor 27, and the feed water temperature sensor 31 described later. Is mixed with water supplied from the water supply pipe 17B and supplied to the auxiliary heat source unit 13.

  The water supply pipe 17B is connected to the hot and cold water mixing valve 25 from the intermediate part via the branch pipe 17C. Further, on the upstream side of the branch pipe 17C of the water supply pipe 17B, a water supply temperature sensor 31 for detecting the temperature of water supplied to the hot water storage tank 12 and the branch pipe 17C, and a water supply pressure to the hot water storage tank 12 are provided. The pressure reducing valve 32 to be adjusted is provided. When the hot water in the hot water storage tank 12 is sent to the hot water supply pipe 17A side and the downstream pressure of the pressure reducing valve 32 decreases, the pressure in the hot water storage tank 12 should be maintained. Accordingly, water is fed into the hot water storage tank 12 from the water supply conduit 17B.

  The heat medium circulation pipe 19 is connected from an outlet of a heat medium passage (not shown) in the solar heat collector 14 to an inlet of the heat medium passage through an inner lower region of the hot water storage tank 12, and the heat medium is connected to the heat medium passage. The hot water in the hot water storage tank 12 is heated by circulating between the hot water tank 190 and the heat radiating part 190 in the hot water storage tank 12.

  The heat medium circulation pipe 19 includes a cistern 41 for storing a heat medium made of antifreeze, a circulation pump 42 for circulating the heat medium in the heat medium circulation pipe 19, and a heat medium for detecting the temperature of the heat medium. A temperature sensor 43 and a normally open heat valve 44 capable of interrupting the circulation of the heat medium in the heat medium circulation pipe 19 are provided in this order from the upstream side (the outlet side of the heat radiating unit 190). By operating the circulation pump 42 with the heat-opening valve 44 opened, the heat medium in the cistern 41 circulates in the heat medium circulation pipe 19.

  Further, the heat medium circulation pipe 19 is provided with a bypass pipe 191 that is connected from the downstream side of the cistern 41 to the upstream side of the heat radiating unit 190 without passing through the solar heat collector 14. The bypass pipe 191 includes a liquid heat exchanger 45 connected to the reheating circulation pipe 18B of the hot water circulation pipe 18 and a normally closed heat valve 46 capable of blocking the flow of the heat medium in the bypass pipe 191. And the circulation pump 42 is operated in a state where the normally closed heat valve 46 is opened, and the heat valve 47 provided in the reheating circulation line 18B is opened to support the auxiliary heat source machine. The hot water in the hot water storage tank 12 can be heated by circulating the hot water in the 13 heating heat exchangers 132 to the liquid heat exchanger 45. When the reheating operation of the hot water in the hot water storage tank 12 using the auxiliary heat source device 13 is performed, the heat medium circulation pipe 19 is normally opened to prevent the heat medium from being circulated to the solar heat collector 14 side. The thermal valve 44 is maintained in a closed state.

  The remote controller 15 includes a display panel 50 that displays the set temperature and the amount of remaining hot water in the hot water storage tank 12, and an operation switch 51 that operates to start and stop the hot water supply operation by the hot water storage type hot water supply system 1.

  Further, as shown in FIG. 2, the display panel 50 is provided with a remaining hot water display unit 500 that indicates the amount of remaining hot water in the hot water storage tank 12 by turning on / off a plurality of scales (here, 4 scales). For example, when the remaining hot water determination unit described later determines that the amount of remaining hot water in the hot water storage tank 12 is maximum, the scale of the remaining hot water display unit 500 is fully lit and it is determined that the remaining hot water amount is minimum. In this case, the scale of the remaining hot water display unit 500 is completely turned off.

  Although not shown, the control circuit 16 is configured by a microcomputer, a memory, and the like. The control circuit 16 executes a hot water supply operation section for supplying hot water in the hot water storage tank 12 to the hot water supply destination P, and the temperature of the hot water in the hot water storage tank 12. A hot water storage operation execution unit to be adjusted, a remaining hot water determination unit that determines the presence or absence of hot water in the hot water storage tank 12 based on the temperature detected by the hot water storage temperature sensor 21, and a determination result of the remaining hot water determination unit are stored as the remaining hot water level. A remaining hot water level storage unit, and a display adjustment unit for displaying the remaining hot water level on the display panel 50.

[Actual operation of remaining hot water display]
Next, the operation of displaying the remaining hot water amount in the hot water storage tank 12 by the control circuit 16 will be described with reference to the flowchart of FIG.

  First, when the operation switch 51 of the remote controller 15 is pressed and turned on, the detected temperature (hereinafter referred to as “hot water temperature”) Tn of each hot water storage temperature sensor 21 is equal to or higher than a predetermined heating target temperature S1 (for example, 32 ° C.). Is determined (ST1).

  In step ST1, if the hot water storage temperature Tn is equal to or higher than the heating target temperature S1, the hot water storage temperature Tn is further set to a predetermined temperature S2 (from the temperature detected by the water supply temperature sensor 31 (hereinafter referred to as “water supply temperature”) Tw). For example, it is determined whether or not the temperature is higher than 3 ° C., that is, whether or not a value obtained by subtracting the feed water temperature Tw from the hot water storage temperature Tn is equal to or higher than a predetermined temperature S2 (ST2).

  As a result, when the value obtained by subtracting the feed water temperature Tw from the hot water storage temperature Tn is equal to or higher than the predetermined temperature S2, hot water that is higher than the feed water temperature Tw and higher than the heating target temperature S1 is stored in the detection region. It is determined that “there is” and “1” is added to the remaining hot water level N (ST3).

  On the other hand, when the value obtained by subtracting the feed water temperature Tw from the hot water storage temperature Tn is less than the predetermined temperature S2 in step ST2, “no remaining hot water” is stored in the detection region of only hot water having the same level as the feed water temperature. The step ST1 is executed again without adding “1” to the remaining hot water level N.

  The steps ST1 to ST3 are performed for each hot water storage temperature sensor 21, and the remaining hot water level N added in each step ST3 is displayed on the remaining hot water display section 500 of the display panel 50 as the remaining hot water amount in the hot water storage tank 12. (For example, if the remaining hot water level N is “4”, the remaining hot water display portion 500 is set to “4 scale full lighting”, and if the remaining hot water level N is “3”, the remaining hot water display portion 500 is set to “ If the remaining hot water level N is “2”, the remaining hot water display portion 500 is set to “2 scale lighting”, and if the remaining hot water level N is “1”, the remaining hot water display portion 500 is set to “1 scale”. Light up ”).

  Although not shown, when the solar battery panel of the solar heat collector 14 receives sunlight and a predetermined amount of power is supplied to the control circuit 16, a hot water storage operation for driving the circulation pump 42 by the power is performed. . As a result, the heat medium heated in the heat medium passage of the solar heat collector 14 by the solar heat is circulated to the heat radiating portion 190 in the hot water storage tank 12, and the hot water in the hot water storage tank 12 is heated. On the other hand, after the operation switch 51 of the remote controller 15 is pressed and turned on, the hot water supply destination P is opened, and when the detected flow rate of the water amount sensor 26 exceeds a predetermined value (for example, 2.7 liters / minute), The solenoid valve 24 of the hot water supply pipe 17A is opened, and hot water in the hot water storage tank 12 is guided to the hot water supply pipe 17A. If the temperature detected by the mixed temperature sensor 27 is higher than the set temperature of the remote controller 15, the hot water mixing valve 25 is adjusted to a predetermined opening without operating the auxiliary heat source unit 13 and the water introduced from the branch pipe 17C. And hot water introduced from the hot water storage tank 12 are mixed at the set temperature and supplied to the hot water supply destination P. Further, when the temperature detected by the mixed temperature sensor 27 is lower than the set temperature, the auxiliary heat source unit 13 is operated and the opening degree of the hot and cold mixing valve 25 is adjusted to branch the hot water introduced from the hot water storage tank 12 or its hot and cold water. The hot water mixed with the water supplied from the pipe 17C is heated to the set temperature in the hot water supply heat exchanger 32 and supplied to the hot water supply destination P.

  After the execution of step ST3, it is determined whether the hot water storage temperature Tn is lower than a predetermined reference temperature S3 (for example, 29 ° C.) lower than the heating target temperature S1 (ST4).

  As a result, when the hot water storage temperature Tn is lower than the reference temperature S3, it is determined that “no hot water” is stored in the detection region, and only “1” from the remaining hot water level N. Is subtracted (ST5).

  On the other hand, if the hot water storage temperature Tn is not less than the reference temperature S3 in step ST4, whether or not the hot water storage temperature Tn is higher than the feed water temperature Tw by a predetermined temperature S2 (for example, 3 ° C.), that is, It is determined whether or not a value obtained by subtracting the feed water temperature Tw from the hot water storage temperature Tn is equal to or higher than a predetermined temperature S2 (ST6).

  As a result, if the value obtained by subtracting the feed water temperature Tw from the hot water storage temperature Tn is equal to or higher than the predetermined temperature S2, hot water that is higher than the feed water temperature Tw and higher than the heating target temperature S1 is stored in the detection region. The step ST4 is executed again, but if the value obtained by subtracting the feed water temperature Tw from the hot water storage temperature Tn is less than the predetermined temperature S2, only hot water having the same level as the feed water temperature is stored in the detection region. In this case, “1” is subtracted from the remaining hot water level N (ST5).

  Similar to the steps ST1 to ST3, the steps ST4 to ST6 are performed for each hot water storage temperature sensor 21, and the remaining hot water level N subtracted in each step ST5 is displayed on the display panel 50 as the remaining hot water amount in the hot water storage tank 12. (For example, if the remaining hot water level N is “3”, the remaining hot water display portion 500 is “3-scale lighting”, and if the remaining hot water level N is “2”, the remaining hot water level N is “2”. If the hot water display unit 500 is “2 scale lighting”, the remaining hot water level N is “1”, the remaining hot water display unit 500 is “1 scale lighting”, and if the remaining hot water level N is “0”, the remaining hot water display is displayed. Part 500 is "turned off all four scales").

  Although not shown, when the hot water supply destination P is closed, the solenoid valve 24 of the hot water supply pipe 17A is closed, and the supply of hot water from the hot water storage tank 12 to the hot water supply pipe 17A is stopped.

  Thus, in the above embodiment, if the hot water storage temperature Tn in one detection region is equal to or higher than the heating target temperature S1 and higher than the feed water temperature Tw by the predetermined temperature S2, it is determined that “remaining hot water is present” and the remaining hot water is displayed. While the remaining hot water amount display of the unit 500 is increased, the hot water storage temperature Tn in one detection region is lower than a predetermined reference temperature S3 lower than the heating target temperature S1, or a value obtained by subtracting the water supply temperature Tw from the hot water storage temperature Tn is If the temperature is lower than the predetermined temperature S2, it is determined that there is no remaining hot water, and the remaining hot water display unit 500 displays the remaining hot water amount. Therefore, the remaining hot water amount is accurately displayed according to the actual remaining hot water amount in the hot water storage tank 12. Is possible. This can prevent the user from misidentifying the driving situation.

  If the hot water tank 12 becomes higher than a predetermined pressure due to the closure of the hot water supply destination P or the thermal expansion of the hot water heated in the hot water storage tank 12, the pressure relief valve 23 is opened and a predetermined amount of hot water is stored in the hot water storage tank. The hot water storage operation is performed when the hot water in the hot water storage tank 12 is leaked to the outside due to the blockage of the pressure relief valve 23 or the hot water storage tank 12 being damaged. Despite being performed for a long time, the remaining hot water display unit 500 may not be fully displayed (the scale is fully lit).

  Therefore, the control circuit 16 in the above-described embodiment is further based on a timer and a temperature detected by the hot water storage temperature sensor 21 disposed at the uppermost position in the hot water storage tank 12 (hereinafter referred to as “upper hot water storage temperature”). And a hot water leak judging section for judging hot water leak from the hot water storage tank 12.

[Actual hot water detection operation]
Next, the hot water leak detection operation of the control circuit 16 for determining whether or not the hot water in the hot water storage tank 12 has leaked to the outside will be described with reference to the flowchart of FIG.

  First, a predetermined amount or more of electric power is supplied from the solar heat collector 14 to the control circuit 16 to start monitoring whether or not the hot water storage operation is started (ST11).

  When it is confirmed in step ST11 that the hot water storage operation has been started, the upper region hot water storage temperature (hereinafter referred to as “initial hot water storage temperature”) Ta at the start of the hot water storage operation is stored (ST12).

  Here, when the solenoid valve 24 of the hot water supply pipe 17A is opened and the hot water supply operation is started, the hot water leakage from the hot water storage tank 12 cannot be accurately detected, so that this hot water storage operation is finished. Then, step ST11 is executed again (ST13 to ST14).

  On the other hand, if it is confirmed in step ST13 that the solenoid valve 24 is not opened, the current upper region hot water storage temperature Tb is higher than the initial hot water storage temperature Ta by a predetermined temperature S4 (for example, 3 ° C.), It is determined whether or not it has continued for a predetermined time K1 (for example, 10 seconds), that is, whether or not the upper region of the hot water storage tank 12 is in a high temperature state for a predetermined time K1 or more (ST15 to ST16).

  As a result, when it is determined that the high-temperature state has continued for a predetermined time K1 or more, it is recognized that the remaining hot water amount in the hot water storage tank 12 is the maximum for a predetermined time or longer, and thus normal without leakage of hot water from the hot water storage tank 12 is normal. After the hot water storage operation is completed, the operation after step ST11 is repeated again (ST17, ST14).

  Moreover, when it is determined in steps ST15 to ST16 that the high temperature state has not continued for a predetermined time K1 or more, there is a suspicion that the hot water stored in the hot water storage tank 12 leaks to the outside for some reason. From the time when the hot water storage operation is completed or until the solenoid valve 24 is opened and the hot water supply operation is started, the state of suspected hot water leakage is equal to or longer than a predetermined determination time K2 (for example, 1 hour). It is determined whether or not it has continued (ST18 to ST19, ST13, ST15 to ST16).

  When it is determined in step ST18 that the state of suspected hot water leakage has continued for the determination time K2 or longer, since it is recognized that hot water has leaked from the hot water storage tank 12 to the outside, the display panel 50 The hot water leakage from the hot water storage tank 12 is displayed (for example, the remaining hot water display section 500 is “four full scales blinking”), and after the hot water storage operation is completed, the operation after the step ST11 is repeated again (ST20, ST14).

  Even if this is a hot water storage system that uses a heating means with relatively low heat collecting capacity, such as a small solar heat collector installed on the balcony of an apartment, the hot water from the hot water storage tank can be reliably Since the leak can be detected, safety is improved.

[Others]
In the above embodiment, when the operation switch 51 of the remote controller 15 is turned on, the remaining hot water amount in the hot water storage tank 12 is quickly determined based on the hot water storage temperature Tn and the feed water temperature Tw (see FIG. 3). Even if the operation switch 51 of the remote controller 15 is turned on, a detection timing adjustment operation that does not permit detection of the feed water temperature until a certain amount of hot water is discharged from the hot water supply destination P may be executed.

  Specifically, the control circuit 16 includes a water flow amount measuring unit that measures the integrated water amount that is sent from the hot water storage tank 12 to the hot water supply destination P, and a water flow amount determining unit that determines whether or not the integrated water amount is equal to or greater than a predetermined water amount. When the operation switch 51 of the remote controller 15 is turned on, first, as shown in the flowchart of FIG. 5, the hot water supply destination P is opened and the solenoid valve 24 of the hot water supply line 17A is opened. Whether or not is monitored (ST31).

  In step ST31, until the electromagnetic valve 24 is opened, detection of the water supply temperature Tw by the water supply temperature sensor 31 is prohibited. If it is confirmed that the electromagnetic valve 24 is opened, the water amount sensor 26 is detected. Thus, it is monitored whether or not the integrated water amount L1 has become equal to or greater than the predetermined water amount Ls (ST32 to ST33).

  As a result, if the integrated water amount L1 is equal to or greater than a predetermined water amount Ls (for example, 1 liter), the detection of the water supply temperature Tw is permitted. Then, when the hot water supply destination P is closed and the solenoid valve 24 of the hot water supply pipe 17A is closed, the detection of the water supply temperature Tw is prohibited, and the operations after the step ST31 are repeated again (ST34 to ST35). .

  Thus, in the said embodiment, the water in the water supply pipe line 12 heated under the influence of external temperature passes through the arrangement part of the water supply temperature sensor 31, and the water temperature in the water supply pipe line 12 is stabilized. Since the above-described remaining hot water amount display operation is executed, the remaining hot water amount in the hot water storage tank 12 can be detected more accurately.

  In the above-described embodiment, a description has been given of a control configuration that reduces the remaining hot water amount display of the remaining hot water display unit 500 when the hot water storage temperature Tn is lower than a predetermined reference temperature S3 that is lower than the heating target temperature S1. When Tn is lower than the heating target temperature S1, a control configuration that reduces the remaining hot water display may be used.

  Moreover, in the said embodiment, the presence or absence of the remaining hot water of each of these detection area | regions based on the detection temperature of the some hot water storage temperature sensor 21 is determined, and the determination result (remaining hot water level N) is the amount of remaining hot water in the hot water storage tank 12. Is displayed on the display panel 50, the presence or absence of remaining hot water in the hot water storage tank 12 is determined based on the temperature detected by one hot water storage temperature sensor 21, and the presence or absence of the remaining hot water is determined as the remaining hot water state in the hot water storage tank 12. The display panel 50 may be turned on / off.

  Furthermore, in the said embodiment, although the amount of hot water in the hot water storage tank 12 was displayed by turning on and off of several scales, you may display by the change of an icon or a color, and a predetermined unit (liter) and ratio (%) You may display with numerical values, such as.

  The hot water storage hot water supply system 1 in the above embodiment is configured to heat hot water in the hot water storage tank 12 by solar heat, but may be configured to heat the hot water by exhaust heat from a power generation device or a heat pump device.

DESCRIPTION OF SYMBOLS 1 ... Hot water storage type hot water supply system 12 ... Hot water storage tank 13 ... Auxiliary heat source machine 14 ... Solar heat collector (heating means)
15 ... Remote control 16 ... Control circuit (control unit)
17A ... Hot water supply pipe 17B ... Water supply pipe 19 ... Heat medium circulation pipe 21 ... Hot water storage temperature sensor 22 ... Hot water temperature sensor 27 ... Mixed temperature sensor 31 ... Water supply temperature Sensor 50 ... display panel (remaining hot water display section)
P ... Hot water supply destination

Claims (2)

A hot water storage tank for storing hot water heated by the heating means, a hot water storage temperature sensor for detecting the hot water storage temperature in the hot water storage tank, a hot water storage temperature sensor for detecting a hot water supply temperature to the hot water storage tank, and a hot water storage tank based on the hot water storage temperature In a hot water storage hot water supply system comprising a remaining hot water determination means for determining the state of remaining hot water in the inside and a remaining hot water display unit for displaying the determination result as the amount of remaining hot water in the hot water storage tank
The remaining hot water determination means determines that there is remaining hot water if the stored hot water temperature is equal to or higher than a predetermined heating target temperature and a value obtained by subtracting the feed water temperature from the hot water temperature is equal to or higher than the predetermined temperature. Alternatively, a hot water storage hot water supply system configured to determine that there is no remaining hot water if the subtracted value is lower than the predetermined temperature. In the hot water storage type hot water supply system according to claim 1,
A plurality of hot water storage temperature sensors that detect the temperature in the hot water storage tank by dividing it into upper and lower predetermined detection areas,
In the remaining hot water display portion, the amount of the detection area determined to have the remaining hot water is increased, the display value of the remaining hot water amount is increased, and the number of the detection areas determined to have no remaining hot water is increased, A hot water storage type hot water supply system having a control configuration in which the displayed value of the remaining hot water amount is reduced.

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