JP2010085018A - Solar heat water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar heat water heater capable of effectively using hot water in a hot water storage tank without wasting the hot water by reducing waste heating by an auxiliary heat source machine only by selecting an energy saving mode by an operation part during the washing of dishes, hands or the like enabling the use of the hot water in the hot water storage tank as it is even if the temperature of the hot water is lower than preset temperature, having excellent handling performance and energy saving performance, capable of securely preventing hot-water filling in a bath having a temperature lower than a set temperature by mistake and the abrupt supply of cold hot water during the use of a shower, and having excellent operation stability and operability. <P>SOLUTION: Normally, when the temperature of hot water in the hot water storage tank is lower than a set hot water supply temperature set by the operation part, a control part heats the hot water in the hot water storage tank by the auxiliary heat source machine. When the energy saving mode is selected by the operation part, even if the temperature of hot water in the hot water storage tank is lower than the set hot water supply temperature set by the operation part, the control part does not perform heating by the auxiliary heat source machine and supplies hot water in the hot water storage tank as it is. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  Even if the hot water temperature in the hot water storage tank is lower than the preset hot water temperature, the present invention provides solar hot water that can be used by supplying hot water as it is without heating the hot water in the hot water storage tank as desired by the user. Related to the vessel.

In conventional solar water heaters, when the hot water temperature in the hot water storage tank is higher than the desired hot water supply temperature, the hot water from the hot water storage tank is diluted with water, once lowered below the desired hot water supply temperature, and then cooked with an auxiliary heat source. In addition, since hot water supply and automatic hot water filling are performed at a desired temperature, there is a problem in that the amount of additional cooking heat is wasted once the temperature has been lowered.
In order to solve this problem, for example, (Patent Document 1) states that “if the hot water temperature in the hot water storage tank is equal to or higher than the predetermined temperature, the hot water in the hot water storage tank and the water supply source When the hot water temperature in the hot water storage tank is lower than the specified temperature, the hot water in the hot water storage tank can be used without using hot water in the hot water storage tank. Is supplied to an auxiliary heat source device, heated there, and supplied at a desired hot water supply temperature.
In addition, (Patent Document 2) states that “the solar water heater and the auxiliary heat source device are electrically connected via the control unit, and the temperature information from the thermometer arranged in each device is the auxiliary information on the solar water heater side and the auxiliary heat source device. It is shared with the heat source side, and a remote controller is connected to the first control unit or the second control unit. In the remote control unit, a desired hot water supply temperature can be input and a hot water storage tank thermometer detects it. A solar water heater that can also display the hot water temperature (Th) is disclosed.
JP 2003-314905 A JP 2003-161513 A

However, the above conventional technique has the following problems.
In (1) (Patent Document 1), the hot water in the hot water storage tank can be used without diluting with water, so that the warm hot water can be used effectively without waste. When the temperature is lower than the predetermined temperature, water from the water supply source must be supplied to the auxiliary heat source device and heated to the desired hot water supply temperature to supply hot water, which not only increases the amount of heating by the auxiliary heat source device, It took time to heat to the desired hot water supply temperature, and had the problem of lack of energy saving and usability.
(2) In (Patent Document 2), since the user can easily know the hot water temperature of the hot water storage tank using the remote controller, the hot water supply temperature or the set temperature is determined flexibly while referring to the hot water temperature ( However, each time it is used, the hot water supply temperature or the set temperature must be confirmed and set, and there is a problem that handling is complicated and lacks usability.

  The present invention has been made in order to solve the above problems, and when performing dishwashing or hand washing that can be used as it is even if the hot water temperature in the hot water storage tank is lower than a preset temperature, By selecting the energy saving mode, waste heat from the auxiliary heat source machine can be reduced and hot water in the hot water storage tank can be used efficiently without waste. Not only is it easy to handle and save energy, it is also set incorrectly. It is possible to reliably prevent the bath from being filled with hot water at a temperature lower than the temperature, and suddenly hot water from being supplied suddenly during use of the shower, and has excellent operational stability and operability. The purpose is to provide a solar water heater.

In order to solve the above problems, the solar water heater of the present invention has the following configuration.
The solar water heater according to claim 1, wherein a hot water storage tank for storing hot water heated by solar heat, a mixing valve for mixing hot water in the hot water storage tank and water from a water supply source, and hot water in the hot water storage tank are supplementarily provided. A solar water heater having an auxiliary heat source device for heating, an operation unit for setting a hot water supply temperature and an operation mode, and a control unit for controlling the whole, wherein the control unit normally has a hot water temperature of the hot water storage tank. When the hot water in the hot water storage tank is heated by the auxiliary heat source unit when the temperature is lower than the set hot water temperature set in the operation unit, and when the energy saving mode is selected in the operation unit, the hot water temperature in the hot water storage tank is Even if the temperature is lower than the set hot water temperature set by the operation unit, the hot water in the hot water storage tank is supplied as it is without heating by the auxiliary heat source device.
This configuration has the following effects.
(1) When the control unit heats the hot water in the hot water storage tank with an auxiliary heat source when the hot water temperature of the hot water storage tank is lower than the set hot water temperature set in the operating unit, and the energy saving mode is selected in the operating unit Even if the hot water temperature in the hot water storage tank is lower than the set hot water temperature set in the operation unit, the hot water in the hot water storage tank is supplied as it is without being heated by the auxiliary heat source machine. When it is not necessary to supply hot water at the set hot water temperature, the user can use the hot water in the hot water storage tank as it is without heating it with the auxiliary heat source machine, simply by selecting the energy saving mode with the operation unit, and is useless. Prevents heating and excels in energy saving.

Here, in normal operation, the control unit mixes the hot water in the hot water tank (hot water temperature) detected by the hot water storage thermistor disposed in the hot water tank and the set hot water temperature set in the operation unit. And control the auxiliary heat source machine.
In other words, if the hot water temperature in the hot water storage tank is equal to the set hot water temperature, hot water is supplied only with the hot water in the hot water storage tank. If the hot water temperature in the hot water storage tank is higher than the set hot water temperature, the hot water temperature to be supplied Is mixed with the hot water in the hot water storage tank and the water supplied from the water supply source so that the hot water is supplied. Also, if the hot water temperature in the hot water storage tank is lower than the set hot water temperature, the hot water in the hot water tank is heated with an auxiliary heat source until it becomes the same as the set hot water temperature. When the temperature difference from the set hot water supply temperature is small, the hot water temperature may exceed the set hot water supply temperature by heating with the auxiliary heat source machine. In that case, after the heating by the auxiliary heat source machine is finished, the mixing valve is controlled so that the hot water temperature to be supplied is equal to the set hot water temperature, and the hot water is supplied by mixing the water supplied from the water supply source, Alternatively, before heating by the auxiliary heat source machine, the mixing valve is controlled to mix the hot water in the hot water storage tank with the water supplied from the water supply source, and once the temperature of the hot water is lowered, Hot water is supplied by heating with an auxiliary heat source so as to be equal to the set hot water temperature.

The operation unit includes a hot water supply temperature setting button for setting the hot water supply temperature and an operation mode setting button for setting the operation mode. The user can appropriately set the hot water supply temperature and the operation mode.
The operation unit has a display unit, and displays the hot water temperature (hot water storage temperature) in the hot water storage tank, the set hot water supply temperature, on / off of the energy saving mode, presence / absence of operation of the auxiliary heat source machine, and the like.
If the auxiliary heat source unit is operating when the energy saving mode is set in the operation unit, the operation of the auxiliary heat source unit is forcibly stopped. At this time, the display unit displays that the energy saving mode is set, and also displays that the operation of the auxiliary heat source unit has been stopped. As a result, the user can confirm that the energy saving mode is reliably set and normal operation is being performed.

Invention of Claim 2 is the solar water heater of Claim 1, Comprising: The said operation part is the operation part for kitchens installed in a kitchen, The operation part for bathrooms installed in a bathroom When either of the kitchen operation unit or the bathroom operation unit is selected in a priority mode that prioritizes setting of the hot water supply temperature or operation mode over the other, the control unit is The priority mode is configured to operate based on the selected setting.
With this configuration, in addition to the operation of the first aspect, the following operation is provided.
(1) Since the operation unit has a kitchen operation unit installed in the kitchen and a bathroom operation unit installed in the bathroom, when using each of the kitchen and the bathroom, The operation mode can be set, and it is excellent in usability.
(2) The priority mode is selected when the priority mode is selected to prioritize the hot water supply temperature or operation mode setting over the other in either the kitchen operating unit or the bathroom operating unit. By operating based on the setting, even when the other set hot water temperature is different, in the kitchen or bathroom where the priority mode is selected, it is possible to reliably supply hot water at the set hot water temperature. Excellent.

  Here, in the kitchen operation unit and the bathroom operation unit, the respective hot water supply temperatures can be set. For example, when using a shower in the bathroom, the priority mode is set in the bathroom operation unit. By selecting, the energy saving mode cannot be selected in the kitchen operation section, and the auxiliary heat source machine will not stop, so hot water is supplied at a temperature lower than the set hot water temperature set in the bathroom operation section. Can be prevented. In the bathroom operation section, it is possible to set a filling temperature for filling the bath.

Invention of Claim 3 is a solar water heater of Claim 1 or 2, Comprising: The said control part interrupts hot water filling of the said bath while hot water supply is performed during hot water filling of a bath In addition, the hot water filling of the bath is resumed after the hot water supply is completed.
With this configuration, in addition to the operation of the first or second aspect, the following operation is provided.
(1) The control unit interrupts the hot water bath while hot water is being supplied while the bath is hot, and restarts the hot water bath after the hot water supply is completed. As a result, the operation of the auxiliary heat source machine stops and only hot water that is lower than the hot water temperature set for the hot water filling that has been set in the operation section for the bathroom is supplied. After the hot water supply is completed, the hot water filling can be performed at a temperature suitable for the hot water filling according to the hot water filling set temperature of the operation section for the bathroom, and the hot water filling time can be minimized. Excellent operation reliability and energy saving.

Invention of Claim 4 is a solar water heater of Claim 2 or 3, Comprising: While the said priority mode is selected by the said operation part for bathrooms, and the hot water supply is performed, the said control part Has a configuration that does not permit the selection of the energy saving mode in the kitchen operation unit.
With this configuration, in addition to the operation of the fourth aspect, the following operation is provided.
(1) While the priority mode is selected in the bathroom operation unit and hot water is being supplied, the control unit does not allow selection of the energy-saving mode in the kitchen operation unit. It is possible to prevent hot water having a temperature lower than the set hot water temperature set in the operation section for the bathroom from being used without being stopped, while using a shower etc. in the bathroom. Excellent in properties.

Here, when hot water is not supplied in the bathroom, the control unit may cancel the priority mode of the bathroom operation unit and allow the selection of the energy saving mode in the kitchen operation unit. This makes it possible to use the kitchen operation unit when the bath is used but hot water such as a shower is not used for a long time or when the priority mode is selected in the bathroom operation unit and the bath is not used. The energy-saving mode can be selected without fail, and hot water can be supplied in the energy-saving mode in the kitchen or washroom.
When the priority mode is selected in the bathroom operation section, the control section detects the presence or absence of hot water supply in the bathroom, so even if the priority mode is selected in the bathroom operation section, hot water supply in the bathroom While the operation is not performed, hot water supply in the energy saving mode can be performed in the kitchen operation unit, and the operation of the useless auxiliary heat source machine can be stopped to improve the energy saving performance.

According to invention of Claim 1, it has the following effects.
(1) When it is not necessary to supply hot water accurately at the set hot water temperature, such as when washing dishes or washing hands, the auxiliary heat source machine can be forced by simply selecting the energy saving mode on the operation unit as required. Therefore, it is possible to provide a solar water heater excellent in energy saving that can be used as it is without wastefully heating the hot water in the hot water storage tank with the auxiliary heat source device.

According to invention of Claim 2, in addition to the effect of Claim 1, it has the following effects.
(1) When the priority mode of the operation section for the bathroom is selected, the set hot water temperature set in the operation section for the bathroom can be reliably maintained, and hot water that is colder than the set hot water temperature is supplied. Therefore, it is possible to provide a solar water heater excellent in the stability of hot water supply and the certainty of hot water supply operation.

According to invention of Claim 3, in addition to the effect of Claim 1 or 2, it has the following effects.
(1) While hot water is being supplied during bath filling, the hot water filling set in the operation unit for the bathroom is suspended by interrupting the hot water filling in the bath and restarting the hot water filling after completion of the hot water supply. The hot water can be reliably filled at the set temperature to keep the reheating time to a minimum, and the hot water can be supplied according to the setting in the operation unit during hot water supply. The hot water filling operation can be used efficiently by stopping hot water and supplying hot water in the hot water storage tank as it is. Excellent hot water filling operation reliability, efficiency and energy saving Solar water heater can be provided.

According to invention of Claim 4, in addition to the effect of Claim 2 or 3, it has the following effects.
(1) While the priority mode is selected in the operation section for the bathroom and the hot water is supplied in the bathroom, the energy-saving mode cannot be selected in the kitchen operation section. It is possible to provide a solar water heater excellent in usability and safety that can surely prevent hot water having a temperature lower than the set hot water temperature of the operation section for the bathroom from being supplied.

Hereinafter, the solar water heater in Embodiment 1 of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a schematic diagram showing the configuration of the solar water heater of the first embodiment.
In FIG. 1, 1 is the solar water heater of the first embodiment, 2 is a heat collector of the solar water heater 1 installed on a roof or the like, 3 is a hot water storage tank of the solar water heater 1 in which tap water is stored, 3a to 3a. 3d is a hot water storage thermistor for detecting the hot water temperature (hot water temperature) in the hot water storage tank 3 at each position in the height direction of the hot water storage tank 3, and 4 is for circulating a heat medium between the heat collector 2 and the hot water storage tank 3. The heat medium circulation flow path 4a of the solar water heater 1 is a heat exchange section 4a formed in a coil shape in the middle of the heat medium circulation flow path 4 and set in the hot water storage tank 3, and 4b is an outlet and a heat collecting section of the heat exchange section 4a The feed pipe of the heat medium circulation flow path 4 connecting between the heat exchangers 2 and 4c are return pipes of the heat medium circulation flow path 4 connecting between the heat collector 2 and the inlet of the heat exchange section 4a, and 5 is heat. A heat medium circulation pump disposed in the middle of the medium circulation flow path 4 for circulating the heat medium, and a hot water storage tank 6 from a water supply source (not shown) A water supply pipe for supplying water to the bottom of the water tank 3, a water supply thermistor 6 a for detecting the temperature (water supply temperature) of the water in the water supply pipe 6, a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank 3, and 8 a hot water discharge pipe 7. A pump 11 provided in the middle of the hot water supply pipe 11 is provided in the middle of the hot water discharge pipe 7 to heat the hot water in the hot water discharge pipe 7 as required, and 11a is provided in the hot water discharge pipe 7 on the downstream side of the auxiliary heat source equipment 11. An auxiliary thermistor outlet thermistor for detecting the temperature of the hot water, 14 is a mixing valve for mixing the hot water discharged from the hot water discharge pipe 7 and the water supplied through the connecting pipe 12 branched from the water supply pipe 6, and 15 is the kitchen from the mixing valve 14 A hot water supply pipe for supplying hot water, 15a is a hot water supply thermistor for detecting the hot water temperature (hot water temperature) in the hot water supply pipe 15, and 16 is branched from the hot water supply pipe 15 to supply hot water used for hot water filling or showering in a bathroom. Hot water pipe for bath, 16a is installed in hot water pipe for bath Electromagnetic valve, 20 is a control unit having a microcomputer for controlling the entire solar water heater 1, 21 kitchen operation portion arranged in the kitchen, 22 is a bathroom manipulation portion disposed bathroom.

A plurality of hot water storage thermistors 3a to 3d are provided in the vertical direction of the hot water storage tank 3 so that the average hot water storage temperature in the hot water storage tank 3 can be detected accurately.
An antifreeze was used as the heat medium circulating in the heat medium circulation channel 4. This is because freezing in the winter or in a cold region can be prevented, and the heat medium circulation flow path 4 and the heat medium circulation pump 6 can be prevented from being damaged, thereby being excellent in reliability.
The mixing valve 14 has a hot water proportional valve for adjusting the flow rate of hot water discharged from the hot water discharge pipe 7 and a water proportional valve for adjusting the flow rate of water supplied through the connection pipe 12 branched from the water supply pipe 6. ing.

The kitchen operation unit 21 and the bathroom operation unit 22 include a hot water supply temperature setting button for setting the hot water supply temperature, an operation mode setting button for setting the operation mode, and the like. The operation mode can be set.
The kitchen operating unit 21 and the bathroom operating unit 22 each have a display unit, and the hot water temperature (hot water temperature) in the hot water storage tank 3, the set hot water temperature, on / off of the energy saving mode, and the auxiliary heat source device 11. The presence / absence of driving is displayed.
The control unit 20 compares the temperatures of the water supply thermistor 6a, the auxiliary heat source unit outlet thermistor 11a, and the hot water supply thermistor 15a with the set hot water supply temperatures set by the kitchen operation unit 21 or the bathroom operation unit 22, and the mixing valve 14 The water proportional valve and water proportional valve are controlled to the optimum positions.

The operation of the solar water heater of the first embodiment configured as described above will be described with reference to the drawings.
FIG. 2 is a flowchart showing the operation of the solar water heater of the first embodiment.
In FIG. 2, when the operation of the solar water heater 1 is started, the control unit 20 determines whether hot water is supplied from a kitchen, a bathroom, a shower in a bathroom, or the like (S1).
When the hot-water tap is opened and hot water is being supplied, the control unit 20 checks whether or not the energy saving mode is selected in the kitchen operation unit 21 (S2).
If the energy saving mode is selected, the operation of the auxiliary heat source unit 11 is stopped and the process returns to Step 1.
Thereby, even if it is lower than the hot water supply temperature set in the operation part 21 for kitchens, the hot water in the hot water storage tank 3 can be supplied as it is without heating by the auxiliary heat source device 11.
In step 2, if the energy saving mode is not selected, the hot water storage temperature is compared with the set hot water supply temperature (S4).
If the hot water storage temperature is higher than the set hot water supply temperature in step 4, it is not necessary to heat the hot water in the hot water storage tank 3, so the operation of the auxiliary heat source unit 11 is stopped and the process returns to step 1.
At this time, hot water is supplied by mixing the hot water in the hot water storage tank 3 and the water supplied from the water supply source by controlling the mixing valve 14 in FIG. 1 so that the hot water temperature to be supplied is equal to the set hot water temperature.
In step 4, if the set hot water supply temperature is equal to or higher than the hot water storage temperature, the auxiliary heat source machine 11 is started to heat the hot water in the hot water storage tank 3, and the process returns to step 1.
At this time, in FIG. 1, the hot water in the hot water storage tank 3 is heated by the auxiliary heat source unit 11 until it becomes approximately the same as the set hot water supply temperature, but when the hot water temperature exceeds the set hot water supply temperature, After completion, the mixing valve 14 is controlled so that the hot water temperature to be supplied is equal to the set hot water temperature, and the hot water is supplied by mixing the water supplied from the water supply source.

In step 1, when the hot-water tap is closed and hot water is not supplied, the control unit 20 checks whether or not the hot water is filled in the bath (S3).
If no hot water filling is performed in step 3, the hot water in the hot water storage tank 3 is not used and does not need to be heated, so the operation of the auxiliary heat source unit 11 is stopped and the process returns to step 1.
In step 3, if hot water filling is performed, the process proceeds to step 4 to compare the hot water storage temperature with the set hot water supply temperature.
If the hot water storage temperature is higher than the set hot water supply temperature for hot water filling (hot water set temperature) in step 4, it is not necessary to heat the hot water in the hot water storage tank 3. Return to.
At this time, the mixing valve 14 in FIG. 1 is controlled to supply water from the hot water in the hot water storage tank 3 and the water supply source so that the hot water temperature to be supplied is equal to the set hot water temperature for hot water filling (hot water set temperature). Fill the water with water.
In step 4, if the set hot water supply temperature is equal to or higher than the hot water storage temperature, the auxiliary heat source machine 11 is started to heat the hot water in the hot water storage tank 3, and the process returns to step 1.
At this time, in FIG. 1, the hot water in the hot water storage tank 3 is heated by the auxiliary heat source unit 11 until it reaches the same level as the set hot water supply temperature for hot water filling (hot water set temperature). When the temperature (hot water set temperature) is exceeded, after the heating by the auxiliary heat source unit 11 is finished, the mixing valve is set so that the hot water temperature to be supplied is equal to the set hot water temperature (hot water set temperature) for hot water filling. 14 is controlled to mix with water supplied from a water supply source and perform hot water filling.

  In addition, when hot water supply is performed during hot water filling of the bath, the control unit 20 interrupts the hot water filling of the bath while hot water is being supplied, and restarts the hot water filling of the bath after the hot water supply is completed. When the energy saving mode is selected at the operation unit 21, the operation of the auxiliary heat source unit 11 is stopped, and the temperature is lower than the set hot water supply temperature for hot water filling (the hot water filling set temperature) set by the operation unit 22 for the bathroom. Even if only hot water is supplied, it is not filled with the low-temperature hot water, and after the hot water supply is completed, according to the setting of the operation section 22 for the bathroom, the hot water setting temperature (hot water setting temperature) is ensured. Hot water filling can be performed to minimize chasing time, and the hot water filling operation is reliable and energy saving.

As described above, the solar water heater in the first embodiment has the following effects.
(1) The control unit 20 normally supplies hot water from the hot water storage tank 3 to the auxiliary heat source unit 11 when the hot water temperature in the hot water storage tank 3 is lower than the set hot water supply temperature set by the kitchen operation unit 21 or the bathroom operation unit 22. When the energy saving mode is selected in the kitchen operation unit 21, heating by the auxiliary heat source device 11 is performed even if the hot water temperature in the hot water storage tank 3 is lower than the set hot water temperature set in the kitchen operation unit 21. Since the hot water in the hot water storage tank 3 is supplied as it is without performing it, the user selects the energy saving mode in the kitchen operation unit 21 when there is no need to supply hot water at a precisely set hot water temperature, such as dishwashing or hand washing. As a result, the hot water in the hot water storage tank 3 can be used as it is without being heated by the auxiliary heat source unit 11, and wasteful heating is prevented and energy saving is excellent.
(2) The kitchen operation unit 21 and the bathroom operation unit 22 have display units, and the hot water temperature (hot water temperature) in the hot water storage tank 3, the set hot water supply temperature, on / off of the energy saving mode, auxiliary heat source machine Since the presence / absence of 11 driving can be displayed, the driving state can be confirmed at a glance, and the usability is excellent.
(3) When the auxiliary heat source unit 11 is operated when the energy saving mode is set in the kitchen operation unit 21, the control unit 20 forcibly stops the operation of the auxiliary heat source unit 11 and By displaying that the energy saving mode has been set on the display unit of the operation unit 21 and displaying that the operation of the auxiliary heat source unit 11 has been stopped, the user can reliably set the energy saving mode and operate normally. Therefore, it is possible to prevent erroneous operation by confirming that the operation has been performed, and the operability and the reliability of operation are excellent.

(Embodiment 2)
The solar water heater in Embodiment 2 will be described below with reference to the drawings. In addition, since the structure of the solar water heater in Embodiment 2 is the same as that of Embodiment 1, description is abbreviate | omitted.
The solar water heater in the second embodiment is different from the first embodiment in that the priority mode can be selected in the operation section 22 for a bathroom.
The operation in the priority mode will be described below. Since other operations are the same as those in the first embodiment, description thereof is omitted.
FIG. 3 is a flowchart showing the priority mode operation of the solar water heater of the second embodiment.
In FIG. 3, the control part 20 confirms whether the priority mode is selected by the operation part 22 for bathrooms (S5).
If the priority mode is selected, the energy saving mode in the kitchen operation unit 21 cannot be selected, and the process returns to the beginning.
As a result, when the priority mode is selected in the bathroom operation unit 22, the auxiliary heat source device 11 is not forcibly stopped, and the temperature is lower than the set hot water supply temperature set in the bathroom operation unit 22. It can prevent hot water from being supplied, and is excellent in usability and safety.

If the priority mode is not selected in the bathroom operation unit 22 in step 5, the selection of the energy saving mode in the kitchen operation unit 21 is permitted and the process returns to the beginning.
Thereby, when the priority mode is not selected in the bathroom operation unit 22, the kitchen operation unit 21 can efficiently perform hot water supply in the energy saving mode, and is excellent in energy saving.
Even if the priority mode is selected in the bathroom operation section 22, it is preferable that the kitchen operation section 22 perform hot water supply in the energy saving mode while hot water supply is not performed in the bathroom. . This is because the energy saving mode can be used effectively, and the operation of the useless auxiliary heat source machine 11 can be reduced to improve the energy saving performance.

Since the solar water heater of Embodiment 2 is configured as described above, it has the following actions in addition to the actions similar to those of Embodiment 1.
(1) When the priority mode that prioritizes setting of the hot water supply temperature and operation mode over the other is selected in the operation section 22 for the bathroom, the control unit 20 operates based on the setting for which the priority mode is selected. Thus, even when the other set hot water temperature is different, in the bathroom where the priority mode is selected, hot water can be reliably supplied at the set hot water temperature, and the stability and usability of hot water are excellent.
(2) When the priority mode is selected in the bathroom operation unit 22, the control unit 20 does not permit the selection of the energy saving mode in the kitchen operation unit 22, so the auxiliary heat source unit 11 is forcibly stopped. It is possible to prevent hot water having a temperature lower than the set hot water temperature set in the operation section 22 for the bathroom while using a shower or the like in the bathroom. Excellent in properties.

  The present invention is based on the auxiliary heat source machine by simply selecting the energy saving mode in the operation unit when washing dishes or the like which can be used as it is even if the hot water temperature in the hot water storage tank is lower than the preset temperature. Reduces wasteful heating and allows the hot water in the hot water storage tank to be used efficiently without waste. Not only is it easy to handle and save energy, but the hot water of the bath is accidentally lower than the set temperature. It is possible to reliably prevent cold hot water from being supplied suddenly while using the shower, and to provide a solar water heater with excellent operational stability and operability. It can contribute to problems and energy saving problems.

The schematic diagram which shows the structure of the solar water heater of Embodiment 1. The flowchart which shows operation | movement of the solar water heater of Embodiment 1. The flowchart which shows operation | movement of the priority mode of the solar water heater of Embodiment 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar water heater 2 Heat collector 3 Hot water storage tank 3a-3d Hot water storage thermistor 4 Heat medium circulation flow path 4a Heat exchange part 4b Outlet pipe 4c Return pipe 5 Heat medium circulation pump 6 Water supply pipe 6a Water supply thermistor 7 Hot water supply pipe 8 Pump 11 Auxiliary heat source machine 11a Auxiliary heat source machine outlet thermistor 14 Mixing valve 15 Hot water supply pipe 15a Hot water supply thermistor 16 Bath hot water supply pipe 16a Solenoid valve 20 Control part 21 Kitchen operation part 22 Bathroom operation part

Claims (4)

A hot water storage tank for storing hot water heated by solar heat, a mixing valve for mixing the hot water in the hot water storage tank and water from the water supply source, an auxiliary heat source machine for auxiliary heating of the hot water in the hot water storage tank, hot water supply temperature and operation A solar water heater having an operation unit for setting a mode and a control unit for controlling the whole,
The control unit normally heats the hot water in the hot water storage tank with the auxiliary heat source when the hot water temperature in the hot water storage tank is lower than the set hot water supply temperature set in the operation unit, and the energy saving mode is selected in the operation unit. When the hot water storage tank is hot, the hot water in the hot water storage tank is supplied as it is without heating by the auxiliary heat source device even if the hot water temperature in the hot water storage tank is lower than the set hot water supply temperature set in the operation unit. A solar water heater.   The operation unit has a kitchen operation unit installed in a kitchen and a bathroom operation unit installed in a bathroom, and in either the kitchen operation unit or the bathroom operation unit The control unit operates according to the setting for which the priority mode is selected when the priority mode for giving priority to the setting of the hot water supply temperature or the operation mode over the other is selected. The solar water heater described.   3. The control unit according to claim 1, wherein the control unit interrupts the hot water filling of the bath while the hot water supply is performed during the hot water filling of the bath, and restarts the hot water filling of the bath after the hot water supply ends. The solar water heater described. The said control part does not permit selection of the said energy saving mode in the said operation part for kitchens, while the said priority mode is selected in the said operation part for bathrooms, and hot water supply is performed. The solar water heater according to 2 or 3.

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