JP2011149660A - Solar heat hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically execute test operation for determinations of water supply and temperature rise of a heat medium, and the like in a heat medium circulation pipe conduit, in a solar heat hot water supply device. <P>SOLUTION: In the test operation control by a control section C, the heat medium in a cistern 8 is circulated to the heat medium circulation pipe conduit 7 by operating a circulation pump P, and a water level of the heat medium in the cistern 8 is detected by every prescribed time to perform water supply determination (ST1-ST7) for detecting a water supply condition in the heat medium circulation pipe conduit 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solar water heater, and more particularly, to a trial operation control of a solar water heater capable of heating a heat medium in a heat medium circulation pipe connecting a solar heat collector and a hot water storage tank with hot water heated by an auxiliary heat source device. .

Conventionally, a solar heat collector that heats a heat medium using solar heat, a hot water storage tank, a heat medium circulation conduit that circulates the heat medium between the solar heat collector and the hot water storage tank, and a downstream side of the hot water storage tank There is known a solar water heater equipped with an auxiliary heat source device such as a water heater connected to a pipe. In this type of solar water heater, the heat medium heated by the solar heat collector is led to the hot water storage tank through the heat medium circulation pipe, and the water supplied to the hot water tank is heated by heat exchange using the heat medium. When the temperature of the hot water in the hot water storage tank is lower than the preset hot water supply temperature, the auxiliary heat source unit is operated during hot water supply operation to supply hot water heated to a predetermined hot water supply preset temperature to the hot water terminal ( For example, Patent Document 1).
In addition, a cistern and a circulation pump are incorporated in the heat medium circulation line from the hot water storage tank to the solar heat collector, and after the heat medium is injected into the cistern, the heat medium is sent to the heat medium circulation line. It circulates through the heat medium circulation line by operation.

JP 2003-148804 A JP 2003-139395 A

  By the way, during the trial operation of the solar water heater as described above, the water filling judgment for confirming the storage amount of the heat medium circulating through the heat medium circulation pipe and the temperature rise judgment for confirming the degree of temperature rise are performed manually. Therefore, there is a problem that the confirmation operation of the test operation is troublesome and cannot be performed efficiently and accurately.

  The present invention has been made in view of the above circumstances, and provides a solar hot water supply apparatus that can automatically and efficiently perform trial operation operations such as water-filling judgment and temperature rise judgment of a heat medium in a heat medium circulation pipe. This is the issue.

The present invention includes a solar heat collector that heats a heat medium using solar heat,
A hot water storage tank for storing hot water,
Circulating a heat medium between the solar heat collector and the hot water storage tank, and a heat medium circulation line having a heat exchange section disposed in the hot water storage tank;
A cistern into which the heat medium is injected;
A circulation pump for circulating the heat medium in the heat medium circulation line;
An auxiliary heat source machine piped downstream of the hot water storage tank,
A liquid-to-liquid heat exchange section provided in the heat medium circulation pipe,
A heating circulation line that extends from the auxiliary heat source unit and is connected to the liquid-liquid heat exchange unit, and circulates the hot water heated by the auxiliary heat source unit;
A control unit for performing trial run control,
Test run control by the control unit
Water filling that detects the water filling condition in the heat medium circulation pipe by operating the circulation pump to circulate the heat medium in the cis turn through the heat medium circulation pipe and detecting the water level of the heat medium in the cis turn every predetermined time. It is a solar water heater set to perform the determination.

In order to execute the trial operation of the solar water heater, first, a predetermined amount of heat medium is manually injected into the cistern. And according to the signal from a control part, a circulation pump is operated and the heat medium in a cistern is circulated in a heat medium circulation pipe line. When the control unit detects the water level of the heat medium in the cistern and determines that the predetermined water level is maintained for a predetermined time, the water filling of the heat medium is regarded as normal. If it is determined that the predetermined water level is not maintained, it is regarded as a water filling abnormality, and it is inspected whether there are any leaks or cracks in the pipes constituting the cistern or the heat medium circulation pipe.
Further, in the above solar water heater, the trial run control by the control unit is replaced with the water filling judgment, and the hot water heated by the auxiliary heat source machine is circulated in the heating circulation line to circulate in the heating medium circulation line. The heating medium heating operation for heating the heating medium at the liquid-to-liquid heat exchanger is started, and the temperature of the heating medium in the heating medium circulation pipe before and after the heating medium heating operation is compared is detected. In the case where the temperature rise determination is performed, it is determined by the heating medium heating operation that the temperature after heating the heating medium is higher than the temperature before heating by a predetermined temperature, and this state continues for a predetermined time. If so, the temperature rise is considered normal. On the other hand, if the heat medium continues for a predetermined time in a state where the temperature does not rise, it is regarded as a temperature rise abnormality, an abnormality such as crushing or blockage of the heat medium circulation pipe or the heating circulation pipe, a circulation pump or liquid Inspect the heat exchange part for any failure.

In the above solar water heater,
In the cistern, a high water level switch for detecting an abnormally high water level of the heat medium and a low water level switch for detecting an abnormally low water level of the heat medium are disposed,
In the water filling judgment of the control unit, it is set so that it is judged whether or not a predetermined time has passed in a state where the output signal from the low water level switch is detected and the output signal from the high water level switch is not detected. desirable.

  In a state where the heat medium is circulated in the heat medium circulation pipe by the circulation pump, the water medium is filled when a predetermined time elapses with the heat medium in the cistern maintaining the water level between the low water level switch and the high water level switch. Is determined to be normal. On the contrary, if the output signal from the low water level switch is not detected or the output signal from the high water level switch is detected for a predetermined determination time, it is determined that the water level is abnormal and inspection of each part is required. Become.

In the above solar water heater,
The heat medium circulation pipe is a heat medium circulation forward path for sending the heat medium from the solar heat collector to the heat exchange section, a heat medium circulation return path for returning the heat medium from the heat exchange section to the solar heat collector, and a heat medium circulation forward path. It has a bypass path that connects the heat medium circulation return path,
A first on-off valve for communicating / blocking the flow of the heat medium to the solar heat collector is provided in the heat medium circulation forward path or the heat medium circulation return path,
The bypass passage is provided with a second on-off valve for communicating / blocking the flow of the heat medium in the bypass passage,
In the trial operation control, the control unit closes the first on-off valve and opens the second on-off valve to cause the heat medium to circulate through the bypass path without passing through the solar heat collector. It is desirable to be able to switch between a path and a second heat medium circulation path that opens the first and second on-off valves and distributes the heat medium also to the solar heat collector side.

In the first heat medium circulation path, the heat medium circulation forward path and the heat medium circulation return path are communicated via the bypass path, and the heat medium is not circulated to the solar heat collector side. Therefore, the water filling determination and the temperature increase determination by the trial operation are performed only in the first heat medium circulation path. If an abnormality is detected in this state, it can be understood that the cause of the abnormality such as a clogged pipe or a failure of various appliances is in the first heat medium circulation path. Further, the first on-off valve is opened to switch to the second heat medium circulation path through which the heat medium also flows to the solar heat collector side, and the test operation is performed on the entire heat medium circulation pipe. If an abnormality is detected in this state, it can be said that the cause of the abnormality is in the second heat medium circulation path.
Further, the first and second on-off valves are opened at the same time when the trial operation is started, and when an abnormality is detected in this state, the first on-off valve is closed to switch to the first heat medium circulation path. May be.
Thus, by switching to the first heat medium circulation path or the second heat medium circulation path and performing the water filling determination and the temperature rise determination at the time of the test operation, it is easy to identify the abnormal part.

In the solar water heater,
It is desirable that a heating medium temperature detector for detecting the temperature of the heating medium is provided between the branching path to the bypass path in the heating medium circulation return path and the circulation pump.
Since the heat medium temperature detector is provided in the heat medium circulation return path in the first heat medium circulation path, the temperature rises during the trial operation in the first heat medium circulation path with the first on-off valve closed. Judgment is possible.

As described above, in the solar water heater of the present invention, the determination of water filling or temperature rise of the heat medium can be performed automatically, so that the test operation can be confirmed efficiently and accurately regardless of the installation location of the equipment. Work can be carried out.
In addition, by closing the first on-off valve, it is possible to carry out a trial operation only in the first heat medium circulation path, so when a water medium abnormality or temperature rise abnormality is detected, It is easy to identify abnormal sites.

It is a schematic block diagram which shows the whole structure of the solar thermal water heater which concerns on embodiment of this invention. It is a flowchart which shows control of water filling determination in the trial operation operation | movement of the solar water heating apparatus which concerns on embodiment of this invention, and the temperature rising determination of a 1st heating-medium circulation path. It is a flowchart which shows control of the temperature rising determination of the 2nd heating-medium circulation path | route in the trial run operation | movement of the solar water heater which concerns on embodiment of this invention.

Below, the solar hot water supply apparatus which makes embodiment of this invention is demonstrated, referring drawings.
As shown in FIG. 1, the solar water heater according to this embodiment includes a solar heat collector 1, a hot water storage tank 2, an auxiliary heat source device 3, a remote controller 4 for setting the operation of the solar water heater and the hot water supply temperature, and the solar heat collector 1. And a heating medium circulation pipe 7 that forms a circulation path for circulating a heat medium between the hot water storage tank 2 and a control unit C that controls a hot water storage operation, a hot water supply operation, a trial operation, and the like of the solar water heater.

  The solar heat collector 1 is installed vertically on the veranda of an apartment house or installed on the roof of a building, etc. A plurality of solar cells are arranged as a panel-shaped heat collecting plate (not shown) and a solar power generation unit. The solar cell panel 1a thus formed is composed of a power generation and heat collecting unit laminated and integrated, and has an internal passage for circulating a heat medium therein. This internal passage constitutes a part of the heat medium circulation pipe 7. The solar cell panel 1a disposed in the solar heat collector 1 is connected to the control unit C by electric wiring, and power during power generation is applied to the control unit C.

  The hot water storage tank 2 is a metal tank that is excellent in corrosion resistance and has a heat retaining effect. The hot water storage tank 2 has a water supply port connected to a water supply pipe 5 that supplies water at the lower part, and is connected to a hot water discharge pipe 6 that discharges hot water at the upper part. The hot water storage tank 2 is provided with four hot water storage tank thermistors 20a, 20b, 20c, and 20d for detecting the temperature of the internal hot water. The detection signals of the four hot water storage tank thermistors 20a, 20b, 20c, and 20d are each output to the control unit C and used for calculation of the hot water temperature control.

  In the water supply pipe 5, a water supply source valve 51, a pressure reducing valve 52, an incoming water temperature thermistor 53 that detects the water supply temperature, a check valve 54, and a drain valve 55 are arranged in this order from the upstream side.

  The hot water storage tank 2 and the auxiliary heat source unit 3 are connected via a hot water discharge pipe 6. The hot water discharge pipe 6 includes a hot water temperature thermistor 61, a pressure relief valve 62, and an electromagnetic valve 63 that detect the temperature of hot water discharged from the hot water storage tank 2 in order from the upstream side between the hot water storage tank 2 and the auxiliary heat source unit 3. A mixing valve 64, a water amount sensor 65, a mixing thermistor 66, and a high-cut thermistor 67 are provided. The water amount sensor 65 detects the flow rate flowing through the tap water pipe 6, and the detection signal is output to the control unit C. Further, the mixing thermistor 66 and the high-cut thermistor 67 detect the temperature of the hot water in the tapping pipe 6, and these detection signals are output to the control unit C.

  A mixing water supply pipe 9 branched from the water supply pipe 5 is branched and connected to the mixing valve 64 provided in the hot water discharge pipe 6. The mixing valve 64 is a valve that mixes hot water discharged from the hot water storage tank 2 and water supplied from the water supply pipe 5 through the mixing water supply pipe 9 according to the temperature of the hot water discharged from the hot water storage tank 2. Yes, the opening degree is adjusted according to the signal from the control unit C.

  The heat medium circulation pipe 7 is provided between the heat medium circulation forward path 7a for sending the heat medium heated by the solar heat collector 1 to the hot water storage tank 2, and the water supplied in the hot water storage tank 2 and the heated heat medium. A heat exchange section 7b for exchanging heat, a heat medium return path 7c for returning the heat medium cooled by the heat exchange to the solar heat collector 1, and a bypass for communicating the heat medium circulation forward path 7a and the heat medium circulation return path 7c. And a path 14. The heat exchanging portion 7 b is configured by a pipe bent in a U shape or the like below the hot water storage tank 2. As the heating medium, an antifreeze containing propylene glycol or the like is used.

In the heating medium circulation return path 7c of the heating medium circulation pipe 7, an open system cistern 8 for storing the heating medium, a circulation pump P, and a heating medium temperature detection unit for detecting the heating medium temperature are sequentially arranged from the upstream side. As a heat medium thermistor 71, a first heat valve 72 for communicating / blocking the flow of the heat medium to the solar heat collector 1 is disposed.
The first heat valve 72 is a normally open on-off valve that is disposed closer to the solar heat collector 1 than the connecting portion between the heat medium circulation return path 7 c and the bypass path 14. It is opened and closed according to the signal. The first thermal valve 72 may be provided in the heat medium circulation forward path 7a, or may be provided in both the heat medium circulation forward path 7a and the heat medium circulation return path 7c.

  The heat medium thermistor 71 is disposed closer to the hot water storage tank 2 than the connection portion between the heat medium circulation return path 7 c and the bypass path 14. As a result, even when the heat medium does not flow through the solar heat collector 1 and is switched to the first heat medium circulation path that flows through the bypass path 14 during a trial operation described later, the heat medium is disposed in the heat medium thermistor 71. Since the part is circulated, the temperature of the heat medium flowing through the heat medium circulation pipe 7 can be detected regardless of the switching of the heat medium circulation path. The heat medium thermistor may also be provided in the heat medium circulation forward path 7a. The detection signal of the heat medium thermistor 71 is output to the control unit C and stored.

  The bypass passage 14 is provided with a second thermal valve 142 that communicates / blocks the flow of the heat medium in the bypass passage 14, and the second thermal valve 142 is a normally closed on-off valve. In response to a signal from the control unit C, it is opened and closed. Further, a liquid-to-liquid heat exchanging portion 141 for connecting a heating circulation conduit 15 extending from the auxiliary heat source device 3 is disposed in the bypass passage 14. As the structure of the liquid-liquid heat exchanging unit 141, for example, a double pipe structure in which a pipe constituting the heating circulation pipe 15 is provided so as to cover the circumference of the pipe constituting the bypass path 14, or one through a partition wall. It is possible to employ a structure in which the bypass passage 14 is connected to the other chamber and the heating circulation conduit 15 is connected to the other chamber.

In the cistern 8, a high water level switch 81 for detecting an abnormally high water level of the heat medium, a low water level switch 82 for detecting an abnormally low water level of the heat medium, and a water level switch 83 for preventing the circulating pump P from idling. Is arranged. In addition, an overflow pipe 84 for discharging the heat medium to the outside of the cis turn 8 when the heat medium overflows is disposed above the cis turn 8.
The high water level switch 81 and the low water level switch 82 output a water level detection signal to the control unit C when touching the heat medium. Based on these water level detection signals, the control unit C determines whether the water level of the heat medium in the cistern 8 exceeds the high water level, is between the high water level and the low water level, or is lower than the low water level. To do.

  The circulation pump P is driven by the solar power generated from the solar battery panel 1a disposed in the solar heat collector 1 when it is equal to or higher than a predetermined power level. When the amount of solar radiation is insufficient, it is driven by electric power from the control unit C applied via the control board 33 connected to a power supply unit (not shown) that is a commercial power source.

  When hot water storage operation is performed with the solar water heater of the present embodiment, the solar heat collector 1 is exposed to solar radiation, and the solar power generated from the solar cell panel 1a applied to the controller C is greater than or equal to a predetermined power. For example, the control unit C drives the circulation pump P with the electric power. Thereby, the heated heat medium is sent to the hot water storage tank 2, the water supplied into the hot water storage tank 2 is heated, and hot water is stored. In the hot water storage operation, the electromagnetic valve 63 provided in the hot water discharge pipe 6 is closed so that hot water is not discharged from the hot water storage tank 2.

  The auxiliary heat source unit 3 includes a hot water supply heating unit 31, a heating heating unit 32, and a control board 33 that controls the operations of the heating units 31 and 32. Each of the heating units 31 and 32 includes a hot water supply heat exchanger 311 and a hot water supply gas burner 312, and a heating heat exchanger 321 and a heating gas burner 322.

  The hot water supply heat exchanger 311 is connected to the hot water outlet pipe 6. When the hot water supply operation is performed, the hot water supply heat exchanger 311 is ignited and heated as necessary, and the hot water flowing in the hot water supply heat exchanger 311 is heat-exchanged. Hot water supply water having a predetermined hot water supply set temperature is supplied from a hot water supply pipe L to a hot water outlet terminal such as a currant provided in a bathroom or kitchen.

  When the hot water supply operation is performed with the solar hot water supply apparatus of the present embodiment, when the hot water outlet terminal is opened, water is supplied from the mixing water supply pipe 9 to the hot water discharge pipe 6 through the mixing valve 64. Then, when flowing water of a predetermined flow rate or more is detected by the water amount sensor 65, the control unit C opens the electromagnetic valve 63 provided in the tap water pipe 6. When the electromagnetic valve 63 is opened, hot water is discharged from the hot water storage tank 2 to the hot water discharge pipe 6, and the hot water temperature thermistor 61 detects the temperature of the hot water discharged and outputs the detected temperature to the control unit C. When the hot water temperature discharged from the hot water storage tank 2 is higher than the hot water supply set temperature required at the hot water terminal input to the control unit C by operating the hot water temperature setting switch of the remote controller 4, the control unit C The opening degree of the mixing valve 64 is adjusted so that the hot water and the water supplied from the mixing water supply pipe 9 are mixed at a predetermined ratio, and the hot water supply temperature is supplied to the outlet terminal without operating the hot water supply heating unit 31. Water is supplied. On the other hand, when the temperature of the hot water discharged from the hot water storage tank 2 is lower than the hot water supply set temperature required at the hot water terminal, the control unit C adjusts the opening of the mixing valve 64 to a predetermined ratio, and the hot water supply heating unit 31. , The hot water supply gas burner 312 is ignited and heated by the hot water supply heat exchanger 311, and hot water at a hot water supply set temperature is supplied to the hot water outlet terminal.

  The heating heat exchanger 321 is connected to a hot water circulation line R that circulates hot water (which may contain antifreeze) by disposing a hot water circulation pump P2. The hot water circulation line R includes a heating circulation line 15 connected to the liquid-to-liquid heat exchanging unit 141 provided in the bypass line 14 of the heat medium circulation line 7 and a heating circulation line 16 connected to the heating device W. It is branched to. The heating circulation line 15 includes a heating circulation path 15a for sending the hot water heated by the heating heat exchanger 321 to the liquid-liquid heat exchanging unit 141, and the hot water cooled by the heat exchange to the heating heat exchanger 321. A heating circulation return path 15b is provided, and a heating valve 151 for communicating / blocking the flow of hot water is disposed in the heating circulation path 15a. The heating circulation pipe 16 is provided with a thermal valve 161 for communicating / blocking the flow of hot water to / from the heating device W.

  The heating unit 32 for heating is normally used as a heating unit for heating the heating device W or the like. However, in the case of a test operation described later, the heat collection energy collected by the solar heat collector 1 due to insufficient solar radiation. When hot water of a predetermined temperature is not stored in the hot water storage tank 2 for a long time, or when the solar water heater is not used for a long time, the hot water in the hot water storage tank 2 may not be replaced and bacteria may propagate. It is used as a heating unit for performing a heating operation according to the necessity of heating hot water in the hot water storage tank 2.

The control unit C is configured mainly with a microcomputer, and includes a hot water supply operation unit for supplying hot water at a hot water supply set temperature from a hot water outlet terminal, a hot water storage operation unit for heating hot water in the hot water storage tank 2, and water filling judgment and ascent at the time of trial operation. It has a test run section that performs temperature judgment. The control unit C is connected to the above-described various sensors, various valves, and the like, and is connected to the remote controller 4 disposed in the bathroom or kitchen via the control board 33 in the auxiliary heat source unit 3. Yes.
The remote controller 4 includes operation switches (not shown) such as an operation switch, a hot water supply temperature setting switch, and a trial operation switch, and a display unit that displays the hot water supply set temperature, the amount of hot water in the hot water storage tank 2, and the like.

Next, the control operation during the trial operation of the solar hot water supply apparatus of the present embodiment will be specifically described with reference to the flowcharts of FIGS.
The trial run program in the present embodiment includes a water filling judgment for determining the amount of water filling of the heat medium in the cis turn 8 and a temperature rising judgment for judging the temperature rising degree of the heat medium circulating in the heat medium circulation pipe 7. Heating of the heat medium in the heat medium circulation line 7 so that the test operation can be executed even under the condition that the heat medium is not heated by the solar heat collector 1 due to a shortage of collected heat energy collected by the solar heat collector 1. Is set to be heated by the liquid-to-liquid heat exchanging portion 141 by the hot water in the heating circulation line 15 extending from the auxiliary heat source unit 3.

Based on the flowchart of FIG. 2, first, the water filling determination of the heat medium circulating in the heat medium circulation pipe 7 will be described.
A predetermined amount of heat medium is manually injected into the cistern 8. Thereafter, when a test operation switch (not shown) of the remote controller 4 is pressed (ST1), the circulation pump P is driven by commercial power via the control unit C, and at the same time, the first thermal valve 72 and the second thermal valve 142 are driven. Is opened (ST2). As a result, the heat medium passes through the heat medium circulation pipe 7 through the second heat medium that is the entire path of the heat medium circulation pipe 7 including the solar heat collector 1 as shown by the solid line thick arrow in FIG. It circulates in the circulation route.
When the heat medium injected into the cistern 8 exceeds the installation level of the low water level switch 82, a low water level detection signal is output to the control unit C, and similarly, the installation level of the high water level switch 81 is set. If it exceeds, a high water level detection signal is output to the control unit C. Therefore, in a state where the heat medium is circulated in the heat medium circulation pipe 7, the low water level detection signal is output (ON) and the high water level detection signal is not output (OFF) in step ST3. That is, when it is determined whether or not a certain time (for example, 5 minutes) has passed in a state where the water level of the heat medium in the cistern 8 is between the high water level and the low water level, and it is determined that the certain time has passed. (YES in ST3), the water filling state is regarded as normal (ST4), and the circulation pump P is stopped (ST5).

In ST3, when the low water level detection signal is output (ON) and the high water level detection signal is not output (OFF) in a state where the state does not continue for a certain period of time (NO in ST3), the water filling determination time (for example, 30 minutes) has elapsed. If it is determined (YES in ST6), it is determined in ST7 that the water filling is abnormal. In this case, the operation of the circulation pump P is stopped (ST5), and it is inspected whether there are any leaks or cracks in the pipes or the like constituting the cistern 8 or the heat medium circulation pipeline 7.
In ST3, it is determined that the water filling is abnormal even when the high water level detection signal is continuously output (ON). In this case, clogging of the heat medium circulation pipe 7 or a failure of the circulation pump P can be considered.
During the test operation, the electromagnetic valve 63 is closed to stop the hot water from the hot water storage tank 2 from being discharged.

If the water filling is normal, the process proceeds to the temperature rise determination of the heat medium in the heat medium circulation line 7.
The heating medium thermistor 71 provided in the heating medium circulation return path 7c of the heating medium circulation pipe 7 detects the temperature of the heating medium before the temperature rise and stores it in the control unit C (ST8).
Thereafter, in response to a signal from the heating operation unit of the control unit C, the heating heating unit 32 is activated, thereby igniting the heating gas burner 322 and heating the hot water in the heating heat exchanger 321 to perform heating. The thermal valve 151 of the circulation line 15 is opened and the hot water circulation pump P2 is driven (ST9), and hot water is circulated in the heating circulation line 15 to heat the liquid-to-liquid heat exchanger 141.
On the other hand, in the heat medium circulation line 7, the circulation pump P is operated, the first thermal valve 72 is closed, and the second thermal valve 142 is opened (ST10). As a result, the heat medium does not flow to the solar heat collector 1 side in the heat medium circulation pipe 7 as shown by the broken-line arrows in FIG. And circulates while being heated by the liquid-to-liquid heat exchanger 141.

Then, the temperature of the heating medium heated by the liquid heat exchanger 141 is detected by the heating medium thermistor 71, and the temperature of the heating medium before heating stored in ST8 and the heating medium after heating are stored. Comparing and calculating the temperature, the temperature detected after heating is raised by a predetermined temperature (for example, 3 ° C.) or more from the temperature before heating, and it is determined whether or not this state has passed for a predetermined time (for example, 1 minute). (ST11). If it is determined YES in ST11, it is determined that the temperature rise is normal (ST12), and if it is determined NO in ST11, it is determined whether or not the state has passed the temperature increase determination time (for example, 30 minutes). In this case (ST13), when the temperature rise determination time elapses, it is regarded as a temperature rise abnormality (ST14).
After the above determination, the temperature rise determination is considered to be finished, the operation of the circulation pump P is stopped (ST15), the thermal valve 151 of the heating circulation line 15 is closed, and the heating gas burner 322 is extinguished. Then, the hot water circulation pump P2 is stopped driving, and the heating operation of the heating heating unit 32 is stopped (ST16).
If it is determined in ST14 that the temperature rise is abnormal, abnormalities such as crushing or blockage of the heat medium circulation line 7 or the heating circulation line 15, the circulation pump P, the heat exchange unit 7b, and the liquid It is inspected whether the heat exchange unit 141 has a failure or the like.
As described above, according to the present embodiment, the determination of water filling of the heat medium and the determination of the temperature rise can be performed automatically, so that the operation for confirming the trial operation can be confirmed efficiently and accurately regardless of the installation location of the equipment. Can be implemented.

  Since the temperature increase determination described above is performed only in the first heat medium circulation path of the heat medium circulation pipe 7, if it is determined in ST14 that the temperature increase is abnormal, the first heat medium circulation path. It is only necessary to inspect each pipe and instrument only in the range that constitutes.

Subsequently, it is desirable to perform the temperature rise determination also in the second heat medium circulation path of the entire heat medium circulation pipe 7 including the solar heat collector 1 side from the bypass path 14.
In this case, as shown in the flowchart of FIG. 3, the same operation as the above-described temperature rise determination (ST8 to ST16 of FIG. 2) is performed. In ST10-1, the heat medium is circulated through the heat medium circulation line 7. When doing so, the first thermal valve 72 and the second thermal valve 142 are opened. As a result, the heat medium circulates in the second heat medium circulation path, which is the entire path of the heat medium circulation pipe 7 including the solar heat collector 1 and the bypass path 14, as indicated by the solid thick arrow in FIG. 1. .
And when it determines with temperature rising abnormality (ST14 of FIG. 3), it can be judged that there is a malfunction in the circuit of the solar-heat collector 1 side rather than the bypass path 14 among the heat-medium circulation pipe lines 7. FIG.
As a result, it becomes easy to identify faulty parts such as clogged pipes or equipment failures.

In the above embodiment, in the temperature rise determination, the first heat valve 72 is closed and the second heat valve 142 is opened, and the first heat medium circulation path of the heat medium circulation line 7 is increased. After performing the temperature determination (ST10 in FIG. 2), the first heat valve 72 and the second heat valve 142 are opened to determine the temperature increase in the second heat medium circulation path. You may perform temperature rising determination only of the 2nd heating-medium circulation path | route which is all the paths of the heating-medium circulation pipe line 7. FIG.
Moreover, you may make it alert | report the result (normal / abnormal) of the water filling determination at the time of the said test operation, and temperature rising determination at the time of determination completion.

DESCRIPTION OF SYMBOLS 1 Solar thermal collector 2 Hot water storage tank 3 Auxiliary heat source machine 7 Heat-medium circulation line 8 Systurn 15 Heating circulation line 141 Liquid-liquid heat exchange part C Control part P Circulation pump

Claims (5)

A solar collector that uses solar heat to heat the heating medium;
A hot water storage tank for storing hot water,
Circulating a heat medium between the solar heat collector and the hot water storage tank, and a heat medium circulation line having a heat exchange section disposed in the hot water storage tank;
A cistern into which the heat medium is injected;
A circulation pump for circulating the heat medium in the heat medium circulation line;
An auxiliary heat source machine piped downstream of the hot water storage tank,
A liquid-to-liquid heat exchange section provided in the heat medium circulation pipe,
A heating circulation line that extends from the auxiliary heat source unit and is connected to the liquid-liquid heat exchange unit, and circulates the hot water heated by the auxiliary heat source unit;
A control unit for performing trial run control,
Test run control by the control unit
Water filling that detects the water filling condition in the heat medium circulation pipe by operating the circulation pump to circulate the heat medium in the cis turn through the heat medium circulation pipe and detecting the water level of the heat medium in the cis turn every predetermined time. A solar water heater set to make a determination. A solar collector that uses solar heat to heat the heating medium;
A hot water storage tank for storing hot water,
Circulating a heat medium between the solar heat collector and the hot water storage tank, and a heat medium circulation line having a heat exchange section disposed in the hot water storage tank;
A cistern into which the heat medium is injected;
A circulation pump for circulating the heat medium in the heat medium circulation line;
An auxiliary heat source machine piped downstream of the hot water storage tank,
A liquid-to-liquid heat exchange section provided in the heat medium circulation pipe,
A heating circulation line that extends from the auxiliary heat source unit and is connected to the liquid-liquid heat exchange unit, and circulates the hot water heated by the auxiliary heat source unit;
A control unit for performing trial run control,
Test run control by the control unit
The heating medium heating operation starts heating the heating medium in the heating medium circulation pipe by the liquid heat exchange section by circulating the hot water heated by the auxiliary heat source machine to the heating circulation pipe, and the heating medium heating operation. A solar water heater that is set to perform temperature rise determination for detecting the temperature rise of the heat medium by comparing the temperature of the heat medium in the heat medium circulation pipe before and after the start. In the cistern, a high water level switch that detects an abnormally high water level of the heat medium and a low water level switch that detects an abnormally low water level of the heat medium are disposed.
The control unit is configured to determine whether or not a predetermined time has passed in a state where an output signal from the low water level switch is detected and an output signal from the high water level switch is not detected in the water filling judgment of the control unit. The solar water heater as described in 2. The heat medium circulation pipe is a heat medium circulation forward path for sending the heat medium from the solar heat collector to the heat exchange section, a heat medium circulation return path for returning the heat medium from the heat exchange section to the solar heat collector, and a heat medium circulation forward path. It has a bypass path that connects the heat medium circulation return path,
A first on-off valve for communicating / blocking the flow of the heat medium to the solar heat collector is provided in the heat medium circulation forward path or the heat medium circulation return path,
The bypass passage is provided with a second on-off valve for communicating / blocking the flow of the heat medium in the bypass passage,
In the trial operation control, the control unit closes the first on-off valve and opens the second on-off valve to cause the heat medium to circulate through the bypass path without passing through the solar heat collector. Either of the first to third aspects can be switched between a path and a second heat medium circulation path in which the first and second on-off valves are opened to allow the heat medium to flow also to the solar heat collector side. The solar water heater as described in 2.   The solar-heated hot water supply apparatus of Claim 4 with which the heat-medium temperature detector which detects the temperature of a heat medium is provided between the branch part and bypass pump in a heat-medium circulation return path.

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