JP2012251726A - Reduction amount calculating device, and sensor failure detection method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reduction amount calculating device capable of detecting failure of a flow rate sensor, and a sensor failure detection method therefor.SOLUTION: A reduction amount calculating device 5 is used for a solar heat water heater system 1 having a solar heat water heater 2 for heating supplied water to produce pre-heated hot water, and a water heater 4 for heating pre-heated hot water supplied from the solar heat water heater 2, and calculates a reduction amount that has been allowed to reduce when the pre-heated water is heated in the water heater 4 by heating of the solar heat water heater 2. The reduction amount calculation device 5 calculate the reduction amount based on a first temperature sensor 51, a second temperature sensor 52, and a flow rate sensor 53, and signal values from these sensors 51 to 53. Further, if the second temperature sensor 52 detects a temperature rise, the reduction amount calculation device 5 detects failure of the flow rate sensor 53 based on whether a flow rate value of the flow rate sensor 53 has increased.

Description

  The present invention relates to a reduction amount calculation apparatus and a sensor abnormality detection method thereof.

  In recent years, reduction of carbon dioxide emissions has been required due to the effects of global warming. In particular, energy consumption in houses is on the rise, and reducing the amount of carbon dioxide emitted from houses has become an urgent issue.

  Therefore, a solar hot water supply system using a solar water heater has been proposed. Solar water heaters heat hot water by using solar heat, thereby reducing consumption of fossil fuels and the like to reduce carbon dioxide emissions.

  There has also been proposed a reduction amount calculation device that calculates and displays the amount of carbon dioxide, fuel cost, and the like that have been reduced through the use of a solar hot water supply system. According to this device, the amount of carbon dioxide reduced, the fuel cost, etc. are calculated and displayed in an integrated manner, so that it is possible to present to the user that the reduction target has been achieved, and to encourage the reduction of the amount of carbon dioxide. (See Patent Document 1).

JP 2003-279144 A

  Here, the apparatus described in Patent Literature 1 includes a temperature sensor and a flow rate sensor in order to calculate a reduced amount of carbon dioxide, a reduced fuel cost, and the like. In general, an impeller type is used as a flow rate sensor. However, in the case of a disconnection in a signal line connecting a flow rate sensor and a calculation unit such as a carbon dioxide amount or a fuel cost, There is a possibility that the signal from the sensor cannot be obtained and the reduction amount cannot be integrated.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a reduction amount calculation device capable of detecting an abnormality of a flow sensor and a sensor abnormality detection method thereof. It is to provide.

  The reduction amount calculation apparatus of the present invention includes a solar water heater that heats supplied water to make preheated hot water, a hot water heater that heats at least one of supplied water and preheated hot water supplied from the solar water heater, This is a reduction amount calculation device that calculates the reduction amount that can be reduced when heating in a water heater by heating a solar water heater, and detects the water temperature before being heated by the solar water heater A first temperature sensor that performs heating, a second temperature sensor that detects the temperature of preheated hot water that is heated by the solar water heater and that is supplied into the pipe extending from the solar water heater to the consumer side, and the solar water heater to the consumer side Reduction that calculates the reduction amount based on the flow rate sensor that detects the flow rate of the preheated hot water supplied into the pipe extending to the first, the second temperature sensor, and the signal value from the flow rate sensor A calculation means; and an abnormality detection means for detecting an abnormality of the flow sensor based on whether or not the flow rate value of the flow sensor has increased when a temperature rise is detected by the second temperature sensor. And

  According to this reduction amount calculation apparatus, when a temperature increase is detected by the second temperature sensor, an abnormality of the flow sensor is detected based on whether or not the flow value of the flow sensor has increased. Here, the case where the temperature rise is detected by the second temperature sensor means that the preheated hot water heated by the solar water heater has started to flow toward the consumer side, and at this time, the flow rate value by the flow rate sensor is If it does not increase, it can be determined that the flow sensor is abnormal. Therefore, an abnormality of the flow sensor can be detected.

  The reduction amount calculation apparatus of the present invention includes a solar water heater that heats supplied water to make preheated hot water, and a water heater that heats at least one of supplied water and preheated hot water supplied from the solar water heater. And a reduction amount calculation device that calculates a reduction amount that can be reduced during heating in the water heater by heating the solar water heater, and the water temperature before being heated by the solar water heater The first temperature sensor for detecting the temperature, the second temperature sensor for detecting the temperature of the preheated hot water supplied by the solar water heater and supplied to the pipe extending from the solar water heater to the consumer side, and the demand from the solar water heater A reduction amount is calculated based on a flow rate sensor that detects the flow rate of the preheated hot water supplied into the pipe extending toward the user, and signal values from the first temperature sensor, the second temperature sensor, and the flow rate sensor. When at least one of the reduction amount calculation means and the accumulated flow rate of preheated hot water that has passed through the flow rate sensor exceeds a predetermined value, or when the cumulative usage time of the flow rate sensor exceeds a predetermined time, the flow rate An abnormality detection means for determining that an abnormality has occurred in the sensor.

  According to this reduction amount calculation apparatus, at least one of the case where the integrated value of the preheated hot water that has passed through the flow sensor becomes equal to or greater than a predetermined value and the cumulative use time of the flow sensor becomes equal to or greater than a predetermined time. In addition, since it is determined that an abnormality has occurred in the flow sensor, it can be determined that an abnormality has occurred when accuracy degradation occurs, such as when the flow sensor has been used for a long period of time. Therefore, an abnormality of the flow sensor can be detected.

  Moreover, the sensor abnormality detection method of the reduction amount calculation apparatus of the present invention includes a solar water heater that heats supplied water to make preheated hot water, and at least one of supplied water and preheated hot water supplied from the solar water heater. A first temperature sensor for detecting a water temperature before being heated by the solar water heater, and being heated by the solar water heater from the solar water heater to the consumer side Signal values of a second temperature sensor for detecting the temperature of the preheated hot water supplied into the pipe extending to the pipe, and a flow rate sensor for detecting the flow rate of the preheated hot water supplied from the solar water heater to the pipe extending from the solar water heater to the consumer side A sensor abnormality detection method for a reduction amount calculation device for calculating a reduction amount that can be reduced when heating preheated hot water by a hot water heater by heating a solar water heater, If the temperature rise is detected by the service, based on whether the flow rate value of the flow rate sensor is increased, characterized in that it comprises an anomaly detection step of detecting an abnormality of the flow rate sensor.

  According to the sensor abnormality detection method of the reduction amount calculation device, when the temperature rise is detected by the second temperature sensor, the abnormality of the flow sensor is detected based on whether or not the flow value of the flow sensor has increased. . Here, the case where the temperature rise is detected by the second temperature sensor means that the preheated hot water heated by the solar water heater has started to flow toward the consumer side, and at this time, the flow rate value by the flow rate sensor is If it does not increase, it can be determined that the flow sensor is abnormal. Therefore, an abnormality of the flow sensor can be detected.

  Moreover, the sensor abnormality detection method of the reduction amount calculation apparatus of the present invention includes a solar water heater that heats supplied water to make preheated hot water, and at least one of supplied water and preheated hot water supplied from the solar water heater. A first temperature sensor for detecting a water temperature before being heated by the solar water heater, and being heated by the solar water heater from the solar water heater to the consumer side Signal values of a second temperature sensor for detecting the temperature of the preheated hot water supplied into the pipe extending to the pipe, and a flow rate sensor for detecting the flow rate of the preheated hot water supplied from the solar water heater to the pipe extending from the solar water heater to the consumer side A sensor abnormality detection method of a reduction amount calculation device for calculating a reduction amount that can be reduced when heating preheated hot water by a water heater by heating a solar water heater, comprising: It is determined that an abnormality has occurred in the flow sensor when the accumulated flow rate of the preheated hot water that has passed exceeds a predetermined value and / or when the accumulated usage time of the flow sensor has exceeded a predetermined time. An abnormality detection step is provided.

  According to the sensor abnormality detection method of the reduction amount calculation device, when the accumulated flow value of the preheated hot water that has passed through the flow sensor becomes equal to or greater than a predetermined value, and when the accumulated usage time of the flow sensor becomes equal to or greater than a predetermined time In at least one of the cases, since it is determined that an abnormality has occurred in the flow sensor, it can be determined that there is an abnormality when accuracy deterioration occurs, such as when the flow sensor has been used for a long period of time. Therefore, an abnormality of the flow sensor can be detected.

  ADVANTAGE OF THE INVENTION According to this invention, the reduction amount calculation apparatus which can detect abnormality of a flow sensor, and its sensor abnormality detection method can be provided.

It is a lineblock diagram of a solar hot water supply system including a reduction amount calculation device concerning this embodiment. It is a block diagram which shows the display calculating part which concerns on this embodiment. It is a figure which shows the state before preheated hot water flows from the hot water storage tank shown in FIG. 1 and after flowing, (a) shows the state before preheated hot water flows, (b) after preheated hot water flows. Indicates the state. It is the graph which showed the relationship between the flow volume and temperature at the time of normal of the flow sensor shown in FIG. It is the graph which showed the relationship between the flow volume at the time of abnormality of the flow sensor shown in FIG. 1, and temperature. It is a flowchart which shows the sensor abnormality detection method of the reduction amount calculation apparatus which concerns on this embodiment.

  First, prior to describing the reduction amount calculation apparatus according to the present embodiment, the solar hot water supply system 1 will be described. FIG. 1 is a configuration diagram of a solar hot water supply system including a reduction amount calculation apparatus according to the present embodiment. The solar hot water supply system 1 includes a water pipe 11, a cold water pipe 12, a hot water pipe 13, a mixed water pipe 14, and a heated water pipe 15. Further, the solar hot water supply system 1 includes a solar water heater 2, a mixing valve 3, and a water heater 4.

  The water pipe 11 supplies water to each of household water appliances such as a kitchen, a washroom, a bath, and a toilet. Moreover, the water pipe 11 is branched and the cold water pipe 12 is connected to the branch location. The cold water pipe 12 guides cold water flowing through the water pipe 11 to the solar water heater 2.

  The solar water heater 2 has a heat collector 21, a heat medium pipe 22, and a hot water tank 23. The heat collector 21 is installed on a roof of a sunny house or the like and takes in solar heat to warm the heat medium. The heat medium pipe 22 connects the heat collector 21 and the hot water storage tank 23 and has a structure in which the heat medium flows inside. The heat medium circulates through the heat collector 21 and the hot water tank 23 via the heat medium pipe 22. The hot water storage tank 23 introduces the cold water from the cold water pipe 12 and heats the cold water with the warmed heat medium flowing through the heat medium pipe 22 to obtain preheated hot water to store hot water.

  The hot water pipe 13 is a pipe for supplying preheated hot water from the hot water tank 23 to the hot water heater 4 side. A mixing valve 3 is installed at the end of the hot water pipe 13, and preheated hot water from the hot water pipe 13 is supplied to the mixing valve 3 from a hot water inlet 31 of the mixing valve 3. Further, the cold water pipe 12 is branched at the connection point A, and the cold water from the cold water pipe 12 can be supplied to the mixing valve 3 through the cold water inlet 32 of the mixing valve 3. The mixing valve 3 mixes the preheated hot water and cold water that flow in as described above to form mixed water.

  The mixed water pipe 14 is a pipe that connects the mixed water outlet 33 of the mixing valve 3 and the water heater 4, and the mixed water is supplied from the mixing valve 3 to the water heater 4 through the pipe 14. In this embodiment, the mixing valve 3 is a hot water mixing valve with an automatic temperature adjustment function that automatically adjusts the mixing ratio of hot water and cold water so that the temperature of the mixed water becomes a predetermined temperature. The configuration of the valve 3 is not limited to this.

  The water heater 4 includes, for example, a gas burner and a heat exchanger, and generates heated water (that is, hot water) having a temperature determined by a user or the like. This water heater 4 is connected to a hot water remote controller or the like provided in a house, and based on a control signal received from the hot water remote controller or the like, for example, the power on, the power off, and the temperature of the generated hot water are Is set.

  The heated water pipe 15 is a pipe that connects the water heater 4 and a shower port on the hot water supply side. The heated water warmed by the water heater 4 is supplied to the user or the like through the heated water pipe 15.

  With the above configuration, the solar hot water supply system 1 converts the cold water from the water pipe 11 into the preheated hot water by the solar water heater 2 using solar heat and supplies it to the hot water heater 4. And the amount of carbon dioxide emitted can be reduced.

  Next, the reduction amount calculation apparatus according to the present embodiment will be described. The reduction amount calculation device 5 is an integrated display of gas charges and carbon dioxide emissions reduced by using the solar water heater 2, and includes a first temperature sensor 51, a second temperature sensor 52, and a flow rate sensor 53. And a calculation display unit 54.

  The first temperature sensor 51 is disposed in the cold water pipe 12 and detects the water temperature before being heated by the solar water heater 2, that is, the temperature of the cold water. The second temperature sensor 52 is disposed in the hot water pipe 13 and detects the temperature of the preheated hot water in the pipe (that is, in the hot water pipe 13) from when heated by the solar water heater 2 until it is supplied to the water heater 4. It is. The flow rate sensor 53 is disposed in the hot water pipe 13 and detects the flow rate of preheated hot water supplied from the solar water heater 2 to the water heater 4.

  The display calculation unit 54 performs various calculation processes and display processes, and has a configuration shown in detail in FIG. FIG. 2 is a configuration diagram illustrating the display calculation unit 54 according to the present embodiment.

  As shown in FIG. 2, the display calculation unit 54 includes a microprocessor (MPU) 54a. The MPU 54a operates according to a predetermined program, and includes a CPU 54a1, a ROM 54a2, and a RAM 54a3.

  The CPU 54a1 executes various processes and controls according to a predetermined program. The ROM 54a2 is a read-only memory that stores programs executed by the CPU 51a. The RAM 54a3 is a readable / writable memory that stores various data and has an area necessary for the processing operation of the CPU 51a.

  In the present embodiment, the ROM 51a2 stores a program for calculating the fuel cost and the amount of carbon dioxide reduced by using the solar water heater 2. Therefore, the CPU 54a1 that executes this program functions as a reduction amount calculation unit that calculates the reduced fuel cost and the amount of carbon dioxide.

  Further, the reduction amount calculation device 5 includes a memory unit 54b, a display unit 54c, and an interface unit 54d.

  The memory unit 54b is a recording medium capable of holding various stored data even when the power supply is interrupted, and an electrically erasable / rewritable memory having various storage areas necessary for processing operations of the CPU 54a1 ( EEPROM) or the like is used.

  As the display unit 54c, an LCD, an LED, or the like is used. For example, the display unit 54c is provided on the main body of the reduction amount calculation device 5 so that a user can see it. The display unit 54c performs various displays such as a reduced heat amount, a reduced carbon dioxide amount, and a reduced fuel cost calculated by the reduction amount calculating unit. In addition, in this embodiment, although the display part 54c is provided in the main-body part of the reduction amount calculation apparatus 5 installed in the outdoors, not only this but it may be provided in the house.

  The interface unit 54d is electrically connected to the first and second temperature sensors 51 and 52 and the flow rate sensor 53, and enables communication between the various sensors 51 to 53 and the MPU 54a.

  In addition, in the present embodiment, the ROM 51a2 stores a program for detecting whether an abnormality has occurred in the flow sensor 53. For this reason, the CPU 54a1 that executes this program functions as an abnormality detection unit that detects an abnormality of the flow sensor 53.

  Next, the principle of abnormality detection by the abnormality detection means will be described in detail. FIG. 3 is a diagram illustrating a state before and after the preheated hot water flows from the hot water storage tank 23 illustrated in FIG. 1, (a) illustrates a state before the preheated hot water flows, and (b) illustrates the preheated hot water. Shows the state after.

  First, as shown in FIG. 3A, when the preheated hot water is not used for some time such as at night, the preheated hot water remaining in the hot water pipe 13 is cooled. For this reason, the temperature of the preheating hot water detected by the 2nd temperature sensor 52 shows a low value. Further, since the preheated hot water is not used, the flow rate value detected by the flow rate sensor 53 indicates zero.

  However, as shown in FIG. 3B, when the preheated hot water is used from the above state, the preheated hot water heated in the hot water storage tank 23 flows through the hot water pipe 13. For this reason, the detection value of the second temperature sensor 52 rises and the detection value of the flow sensor 53 also rises.

  FIG. 4 is a graph showing the relationship between the flow rate and temperature when the flow sensor 53 shown in FIG. 1 is normal, and FIG. 5 is a graph showing the relationship between the flow rate and temperature when the flow sensor 53 shown in FIG. It is the graph which showed the relationship. 4 and 5, the solid line indicates the temperature, and the broken line indicates the flow rate.

  4 and 5, the disconnection of the signal line connecting the flow sensor 53 and the arithmetic processing unit 54 of the reduction amount calculation device 5 will be described as one example of an abnormality, but the present invention is not limited to this. When the sensor 54 is of an impeller type, the present invention can be applied to other abnormalities such as a case where the sensor 54 does not rotate due to foreign matter mixed into the impeller.

  As shown in FIG. 4, for example, assume that the state shown in FIG. That is, it is assumed that the preheated hot water is not used for a certain period of time such as at night, and the preheated hot water remaining in the hot water pipe 13 is cooled. In this case, the detection value of the second temperature sensor 52 indicates a low value T1. Further, since the preheated hot water is not used, the flow rate value detected by the flow rate sensor 53 indicates zero.

  Then, it is assumed that use of preheated hot water is started at time t1. At this time, the preheated hot water warmed in the hot water tank 23 flows through the hot water pipe 13, and the detected value of the second temperature sensor 52 rises to T2 at time t2. Furthermore, the detection value of the flow sensor 53 also increases to R1.

  On the other hand, as shown in FIG. 5, when an abnormality occurs in which the signal line of the flow sensor 53 is disconnected or the impeller does not rotate, the use of the preheated hot water is started at time t1. The detection value of the second temperature sensor 52 rises to T2 at time t2, but the detection value of the flow sensor 53 maintains zero.

  Thus, the abnormality detection means detects an abnormality of the flow sensor 53 based on whether or not the flow value of the flow sensor 53 has increased when the second temperature sensor 52 detects an increase in temperature. Note that the preheated hot water in the hot water pipe 13 may be heated by the influence of sunlight or the like. For this reason, the abnormality detection means may detect whether the flow rate value of the flow sensor 53 has increased and detect an abnormality of the flow rate sensor 53 when a temperature increase of a predetermined temperature or more is detected within a specified time. desirable.

  FIG. 6 is a flowchart showing a sensor abnormality detection method of the reduction amount calculation apparatus 5 according to this embodiment. As shown in FIG. 6, first, the CPU 54a1, that is, the abnormality detecting means determines whether or not a predetermined time has elapsed since the use of the reduction amount calculation device 5 (flow rate sensor 53) was started (S1). Here, the predetermined time is, for example, 15 years.

  When it is determined that a predetermined time has elapsed since the use of the reduction amount calculation device 5 is started (S1: YES), the abnormality detection unit detects that an abnormality has occurred in the flow sensor 53 (S2). That is, the abnormality detection means determines that such a state is a sensor abnormality because there is a possibility that a malfunction may occur in operation due to long-term use. As described above, the abnormality detection unit determines that the abnormality is detected even in the long-term use in addition to the abnormality detection described with reference to FIGS. 3 to 5, and the reduction value cannot be calculated due to the malfunction due to the long-term use. The situation is prevented. Thereafter, the CPU 54a1 displays a warning on the display unit 54c (S3), and the process shown in FIG. 6 ends.

On the other hand, when it is determined that the predetermined time has not elapsed since the use of the reduction amount calculation device 5 is started (S1: NO), the abnormality detection unit integrates the flow rate after the use of the reduction amount calculation device 5 is started. It is determined whether or not the value is equal to or greater than a predetermined value (S4). Here, the predetermined value is, for example, 3000 m ³ .

  When it is determined that the integrated flow rate is equal to or greater than the predetermined value (S4: YES), the process proceeds to step S2, and the process illustrated in FIG. 6 is terminated through steps S2 and S3.

  When it is determined that the integrated flow rate is not greater than or equal to the predetermined value (S4: NO), the abnormality detection means determines whether a specified time has elapsed since the previous temperature detection (S5). If it is determined that the specified time has not elapsed (S5: NO), the process proceeds to step S1.

  When it is determined that the specified time has elapsed (S5: YES), the abnormality detection unit determines whether or not the temperature has increased by a predetermined temperature or more since the previous temperature detection (S6). If it is determined that the temperature has not risen above the predetermined temperature since the previous temperature detection (S6: NO), the process proceeds to step S1.

  When it is determined that the temperature has increased by a predetermined temperature or more since the previous temperature detection (S6: YES), the abnormality detection unit determines whether the flow rate value has increased (S7). When it is determined that the flow rate value has increased (S7: YES), the abnormality detection means determines that the flow rate sensor 53 is normal (S8). Thereafter, the process shown in FIG. 6 ends.

  On the other hand, if it is determined that the flow rate value has not increased (S7: NO), the process proceeds to step S2, and the process shown in FIG. 6 is terminated through steps S2 and S3.

  Thus, according to the reduction amount calculation device 5 and the sensor abnormality detection method thereof according to the present embodiment, when the temperature increase is detected by the second temperature sensor 52, has the flow rate value of the flow sensor 53 increased? Based on whether or not, an abnormality of the flow sensor 53 is detected. Here, the case where the temperature rise is detected by the second temperature sensor 52 indicates that the preheated hot water heated by the solar water heater 2 has started to flow toward the water heater 4. If the flow rate value does not increase, it can be determined that the flow sensor 53 is abnormal. Accordingly, an abnormality of the flow sensor 53 can be detected.

  In addition, the flow sensor 53 is at least one of the case where the integrated flow value of the preheated hot water that has passed through the flow sensor 53 becomes a predetermined value or more and the case where the accumulated usage time of the flow sensor 53 becomes a predetermined time or more. Since it is determined that an abnormality has occurred, it is possible to contribute to the calculation of an accurate reduction value by determining an abnormality when accuracy degradation occurs, such as when the flow sensor 53 has been used for a long period of time.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention.

  For example, in the present embodiment, the solar water heater 2 heats cold water stored in the hot water tank 23 with a heat medium, but is not limited thereto, and guides cold water from the water pipe 11 to the heat collector 21. It may be one that heats cold water. Further, the solar water heater 2 is not limited to the one provided with the heat collector 21 and the hot water tank 23, and may be an integrated solar water heater 2 that does not include the hot water tank 23.

  Further, in the present embodiment, the abnormality detection unit has been described by taking the example of the disconnection of the signal line of the flow sensor 53 and the abnormality in which the impeller does not rotate. However, the present invention is not limited to this. Abnormalities that are substantially zero can be detected.

  Furthermore, the reduction value calculation apparatus 5 according to the present embodiment is configured to display a warning on the display unit 54c when the sensor is abnormal, but is not limited thereto, and may provide a voice warning or communicate with a gas management center or the like. The structure which notifies may be sufficient.

  Moreover, in this embodiment, although the solar hot water supply system 1 by which the preheated hot water heated by the solar water heater 2 is supplied to the hot water heater 4 was demonstrated to the example, it does not restrict to this but passes the hot water heater 4 from the solar water heater 2. The present invention may be applied to a solar hot water supply system that is directly supplied to the consumer side. Further, the present invention may be applied to a solar hot water supply system having both functions of supplying the preheated hot water heated by the solar water heater 2 via the hot water heater 4 and supplying it directly to the consumer side.

  In addition, in the solar hot water supply system 1 according to the present embodiment, one mixing valve 3 is provided, but the number of valves is not limited to this, and a plurality of valves may be provided. Further, a valve other than the mixing valve 3 may be provided. Moreover, the water heater 4 is not restricted to what was shown above, such as a thing provided with an additional cooking function.

DESCRIPTION OF SYMBOLS 1 Solar hot water supply system 11 Water pipe 12 Cold water pipe 13 Hot water pipe 14 Mixed water pipe 15 Heated water pipe 2 Solar water heater 21 Heat collector 22 Heat-medium piping 23 Hot water storage tank 3 Mixing valve 31 Hot water inlet 32 Cold water inlet 33 Mixed water outlet 4 Water heater 5 Reduction value calculation device 51 First temperature sensor 52 Second temperature sensor 53 Flow rate sensor 54 Display calculation unit 54a MPU
54a1 CPU
54a2 ROM
54a3 RAM
54b Memory section 54c Display section 54d Interface section

Claims (4)

Used in a solar water heating system having a solar water heater that heats supplied water to make preheated hot water, and a water heater that heats at least one of the supplied water and the preheated hot water supplied from the solar water heater A reduction amount calculation device for calculating a reduction amount that can be reduced during heating in the water heater by heating the solar water heater,
A first temperature sensor for detecting a water temperature before being heated by the solar water heater;
A second temperature sensor that detects the temperature of preheated hot water that is heated by the solar water heater and supplied into a pipe extending from the solar water heater to the consumer side;
A flow rate sensor for detecting a flow rate of preheated hot water supplied into a pipe extending from the solar water heater to the consumer side;
A reduction amount calculation means for calculating the reduction amount based on signal values from the first temperature sensor, the second temperature sensor, and the flow rate sensor;
An abnormality detecting means for detecting an abnormality of the flow rate sensor based on whether or not the flow rate value of the flow rate sensor has increased when a temperature increase is detected by the second temperature sensor;
A reduction amount calculation apparatus comprising: Used in a solar water heating system having a solar water heater that heats supplied water to make preheated hot water, and a water heater that heats at least one of the supplied water and the preheated hot water supplied from the solar water heater A reduction amount calculation device for calculating a reduction amount that can be reduced during heating in the water heater by heating the solar water heater,
A first temperature sensor for detecting a water temperature before being heated by the solar water heater;
A second temperature sensor that detects the temperature of preheated hot water that is heated by the solar water heater and supplied into a pipe extending from the solar water heater to the consumer side;
A flow rate sensor for detecting a flow rate of preheated hot water supplied into a pipe extending from the solar water heater to the consumer side;
A reduction amount calculation means for calculating the reduction amount based on signal values from the first temperature sensor, the second temperature sensor, and the flow rate sensor;
The flow rate sensor is abnormal when at least one of the accumulated flow rate of the preheated hot water that has passed through the flow rate sensor exceeds a predetermined value and the accumulated usage time of the flow rate sensor exceeds a predetermined time. An anomaly detection means for determining that has occurred;
A reduction amount calculation apparatus comprising: Used in a solar water heating system having a solar water heater that heats supplied water to make preheated hot water, and a water heater that heats at least one of the supplied water and the preheated hot water supplied from the solar water heater A first temperature sensor that detects a water temperature before being heated by the solar water heater, and a temperature of preheated hot water that is heated by the solar water heater and supplied from the solar water heater to a pipe extending to a consumer side. Based on the signal value of the second temperature sensor to be detected and the flow rate sensor for detecting the flow rate of preheated hot water supplied from the solar water heater to the pipe extending from the solar water heater to the consumer side, the solar water heater is heated to A sensor abnormality detection method of a reduction amount calculation device that calculates a reduction amount that can be reduced when the preheated hot water is heated by a water heater,
A reduction comprising an abnormality detection step of detecting an abnormality of the flow sensor based on whether or not the flow value of the flow sensor has increased when a temperature rise is detected by the second temperature sensor. Sensor abnormality detection method of quantity calculation device. Used in a solar water heating system having a solar water heater that heats supplied water to make preheated hot water, and a water heater that heats at least one of the supplied water and the preheated hot water supplied from the solar water heater A first temperature sensor that detects a water temperature before being heated by the solar water heater, and a temperature of preheated hot water that is heated by the solar water heater and supplied from the solar water heater to a pipe extending to a consumer side. Based on the signal value of the second temperature sensor to be detected and the flow rate sensor for detecting the flow rate of preheated hot water supplied from the solar water heater to the pipe extending from the solar water heater to the consumer side, the solar water heater is heated to A sensor abnormality detection method of a reduction amount calculation device that calculates a reduction amount that can be reduced when the preheated hot water is heated by a water heater,
The flow rate sensor is abnormal when at least one of the accumulated flow rate of the preheated hot water that has passed through the flow rate sensor exceeds a predetermined value and the accumulated usage time of the flow rate sensor exceeds a predetermined time. A method for detecting a sensor abnormality in a reduction amount calculation apparatus, comprising: an abnormality detection step for determining that a problem has occurred.

Images