JP6043538B2 - Flow rate calibration method, flow rate calibration device, and reduced heat amount calculation device - Google Patents

Description

  The present invention relates to a flow rate calibration method, a flow rate calibration device, and a reduced heat amount calculation device.

  Conventionally, a solar hot water supply system using a solar water heater has been proposed. A solar water heater heats hot water by using solar heat, thereby reducing consumption of fossil fuels and the like to reduce carbon dioxide emissions (see, for example, Patent Document 1).

  In recent years, a mechanism has been established to document the environmental value of the amount of heat reduced by the solar hot water supply system (green heat certificate). This green heat certificate is under consideration for appropriation of caps in the domestic emissions trading system using the cap-and-trade method.

  In certifying the amount of heat that has been reduced, a measuring instrument that measures the amount of heat that has been reduced is required to have a high accuracy in calculating the amount of heat to be reduced. Here, the amount of heat reduced in the solar water heating system is obtained from the temperature of the water before being heated by the solar water heater, the temperature of the hot water after being heated, and the flow rate of the hot water supplied to the home from the solar water heater. Can do.

JP 2000-081245 A

  However, when an inexpensive flow rate sensor is used to calculate the amount of heat reduction in the solar hot water supply system described in Patent Document 1, the measurement accuracy of the flow rate is poor and the requirement for documentation is not satisfied.

  The present invention has been made to solve such a conventional problem, and the object of the present invention is to measure the flow rate for calculating the reduced heat amount with higher accuracy while suppressing an increase in cost. An object of the present invention is to provide a simple flow rate calibration method, a flow rate calibration device, and a reduced heat amount calculation device.

The flow rate calibration method 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 the supplied water and the preheated hot water supplied from the solar water heater. At least one of preheated hot water supplied from a solar water heater and mixed water in which the preheated hot water and cold water are mixed is used as a detection target water, and an output corresponding to the flow rate of the detection target water is used. A correlation data storage means for storing correlation data between an output obtained from the flow sensor and a flow value, and a correlation stored by the correlation data storage means when an output is obtained from the flow sensor. Based on the data, the flow rate calculation means for calculating the flow rate value, the first temperature sensor for detecting the water temperature before being heated by the solar water heater, and the first temperature sensor for detecting the temperature of the detection target water. A temperature sensor, and based on the signal values from the first temperature sensor and the second temperature sensor and the flow rate value calculated by the flow rate calculation means, the reduction that can be reduced when heating in the water heater by heating the solar water heater This is a flow rate calibration method for calibrating the flow rate calculation means of the reduced heat quantity calculation device that calculates the amount of heat, and the output of the flow sensor in the rated minimum flow rate, the rated maximum flow rate, and the flow rate range between the rated minimum flow rate and the rated maximum flow rate. An output storage process for storing a fluid obtained by flowing a fluid having three known flow values of a change point flow rate, which is a characteristic change point, to the flow sensor, and an output stored in the output storage process are correlated. to match the three known flow rate value on the stored correlation data by the data storage means and calibrating the correlation data, the flow rate in less than changing point flow rate A correction coefficient corresponding is stored in the correlation data storage means, characterized in that it comprises a flow calibration steps previously.

  According to this flow rate calibration method, a fluid having three known flow rate values of the rated minimum flow rate, the rated maximum flow rate, and the change point flow rate is passed through the flow sensor, and the obtained output is stored and stored. The correlation data is calibrated so that the output matches the three known flow values on the correlation data. Here, when the fluid from the low flow rate region to the high flow rate region is flowed to the flow sensor, the inventors of the present invention have a flow rate from the rated minimum flow rate to the change point flow rate (for example, 20% of the maximum rated flow rate). -It was found that the gradient of the output characteristics is different from the gradient from the change point flow rate to the rated maximum flow rate. For this reason, by calibrating based on the output obtained with the fluid having the three known flow values, the accuracy can be improved even with a low-cost and inferior flow rate sensor. In particular, in the present invention, even if calibration is performed with only three points, a certain degree of accuracy can be ensured, so that an increase in cost due to calibration can be suppressed. Therefore, it is possible to measure the flow rate for calculating the reduced heat amount with higher accuracy while suppressing an increase in cost.

Further , when the flow rate is less than the change point flow rate, a correction coefficient corresponding to the flow rate is stored in the correlation data storage means. Here, the present inventors have found that there is a second change point flow rate that becomes a change point of the output characteristics of the flow rate sensor in a flow rate region less than the change point flow rate. For this reason, by storing a correction coefficient corresponding to the flow rate below the change point flow rate, the correction coefficient is calculated when the flow rate below the change point flow rate is calculated at the stage where the reduced heat amount calculation device is actually used. The flow rate measurement accuracy can be further increased.

The flow rate calibration device of the present invention comprises 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. At least one of preheated hot water supplied from a solar water heater and mixed water in which the preheated hot water and cold water are mixed is used as a detection target water, and an output corresponding to the flow rate of the detection target water is used. A correlation data storage means for storing correlation data between an output obtained from the flow sensor and a flow value, and a correlation stored by the correlation data storage means when an output is obtained from the flow sensor. Based on the data, the flow rate calculation means for calculating the flow rate value, the first temperature sensor for detecting the water temperature before being heated by the solar water heater, and the first temperature sensor for detecting the temperature of the detection target water. A temperature sensor, and based on the signal values from the first temperature sensor and the second temperature sensor and the flow rate value calculated by the flow rate calculation means, the reduction that can be reduced when heating in the water heater by heating the solar water heater This is a flow rate calibration device that calibrates the flow rate calculation means of the reduced heat amount calculation device that calculates the heat amount, and the output of the flow sensor in the rated minimum flow rate, the rated maximum flow rate, and the flow rate range between the rated minimum flow rate and the rated maximum flow rate. A flow having three known flow values of the change point flow rate, which is a characteristic change point, is caused to flow through the flow sensor, and the output storage means for storing the obtained output is correlated with the output stored by the output storage means. the stored correlation data of the data storage means, as well as calibrate the correlation data to match the three known flow rate value, the flow rate at less than the change point flow rate The Flip correction coefficient is stored in the correlation data storage means, characterized in that it comprises a flow calibration means previously.

According to this flow rate calibration device, a fluid having three known flow rate values of the rated minimum flow rate, the rated maximum flow rate, and the change point flow rate is flowed to the flow sensor, and the obtained output is stored and stored. The correlation data is calibrated so that the output matches the three known flow values on the correlation data. Here, when the fluid from the low flow rate region to the high flow rate region is flowed to the flow sensor, the inventors of the present invention have a flow rate from the rated minimum flow rate to the change point flow rate (for example, 20% of the maximum rated flow rate). -It was found that the gradient of the output characteristics is different from the gradient from the change point flow rate to the rated maximum flow rate. For this reason, by calibrating based on the output obtained with the fluid having the three known flow values, the accuracy can be improved even with a low-cost and inferior flow rate sensor. In particular, in the present invention, even if calibration is performed with only three points, a certain degree of accuracy can be ensured, so that an increase in cost due to calibration can be suppressed. Therefore, it is possible to measure the flow rate for calculating the reduced heat amount with higher accuracy while suppressing an increase in cost. Further, when the flow rate is less than the change point flow rate, a correction coefficient corresponding to the flow rate is stored in the correlation data storage means. Here, the present inventors have found that there is a second change point flow rate that becomes a change point of the output characteristics of the flow rate sensor in a flow rate region less than the change point flow rate. For this reason, by storing a correction coefficient corresponding to the flow rate below the change point flow rate, the correction coefficient is calculated when the flow rate below the change point flow rate is calculated at the stage where the reduced heat amount calculation device is actually used. The flow rate measurement accuracy can be further increased.

The reduced calorific value calculation device of the present invention includes a solar water heater that heats supplied water to preheat hot water, a water heater that heats at least one of supplied water and preheated hot water supplied from the solar water heater, The detection target water is at least one of preheated hot water supplied from a solar water heater and mixed water in which the preheated hot water and cold water are mixed, and an output corresponding to the flow rate of the detection target water. Stored in the correlation data storage means when the output is obtained from the flow sensor, the correlation data storage means storing the correlation data between the output obtained from the flow sensor and the flow value, Based on the correlation data, the flow rate calculation means for calculating the flow rate value, the first temperature sensor for detecting the water temperature before being heated by the solar water heater, and the temperature of the detection target water are detected. A second temperature sensor, and based on the signal values from the first temperature sensor and the second temperature sensor and the flow rate value calculated by the flow rate calculation means, the heating of the solar water heater can be reduced when heating in the water heater In the reduced heat quantity calculation device for calculating the reduced heat quantity, the flow rate value calculated by the flow rate calculation means according to the attitude information input means for inputting attitude information related to the mounting attitude of the flow sensor and the attitude information input by the attitude information input means The correlation data stored in the correlation data storage means includes the rated minimum flow rate, the rated maximum flow rate, and the output of the flow sensor in the flow rate range between the rated minimum flow rate and the rated maximum flow rate. The output obtained by flowing a fluid having three known flow values of the change point flow rate, which is a characteristic change point, to the flow sensor, and three known values With a flow rate value is calibrated to match, is calibrated in advance one position, posture correction means, and orientation indicated by the position information inputted by the posture information input means is different from the previously one posture In this case, the flow rate value calculated by the flow rate calculation means is corrected .

  According to this reduced heat quantity calculation device, the correlation data includes an output obtained by flowing a fluid having three known flow rate values, ie, a rated minimum flow rate, a rated maximum flow rate, and a change point flow rate, to the flow sensor, and 3 Calibrated to match two known flow values. Here, when the fluid from the low flow rate region to the high flow rate region is flowed to the flow sensor, the inventors of the present invention have a flow rate from the rated minimum flow rate to the change point flow rate (for example, 20% of the maximum rated flow rate). -It was found that the gradient of the output characteristics is different from the gradient from the change point flow rate to the rated maximum flow rate. For this reason, the reduced calorific value calculation device calibrated based on the output obtained with the fluid having the three known flow rate values described above has a certain accuracy even if a low-cost and inaccurate flow rate sensor is used. It is secured. In particular, the reduced heat amount calculation apparatus is calibrated at three points, and the cost increase is suppressed as compared with the case where calibration is performed at multiple points. Therefore, it is possible to measure the flow rate for calculating the reduced heat amount with higher accuracy while suppressing an increase in cost.

Further , the correlation data is calibrated in advance in one posture, and when the posture indicated by the inputted posture information is different from one posture in advance, the calculated flow rate value is corrected. For this reason, for example, when the flow rate sensor is an impeller type, even if the sliding resistance between the shaft of the impeller and the bearing differs from that during calibration depending on the mounting posture, a decrease in accuracy can be suppressed. In particular, since the correlation data is calibrated in advance in one posture, it is not necessary to calibrate for each mounting posture, which can contribute to a reduction in installation man-hours.

  According to the present invention, it is possible to provide a flow rate calibration method, a flow rate calibration device, and a reduced heat amount calculation device capable of measuring a flow rate for calculating a reduced heat amount with higher accuracy while suppressing an increase in cost.

It is a lineblock diagram of a solar hot water supply system including a reduction calorie | heat amount calculation apparatus which concerns on this embodiment. It is a block diagram which shows the calculation display which concerns on this embodiment. FIG. 3 is a functional block diagram of the calculation display shown in FIGS. 1 and 2. It is a graph which shows the flow volume-output characteristic in an impeller type flow sensor. It is a block diagram which shows the flow volume calibration apparatus which concerns on this embodiment. It is a graph which shows the relationship between a flow volume and the output (pulse number) from a flow sensor. It is a graph which shows the error of a flow sensor at the time of changing a flow rate. It is a graph which shows the error of a flow sensor at the time of changing a flow, and shows the example of horizontal mounting. It is a figure which shows the measurement data of the pulse number at the time of flowing water etc. to a rated maximum flow volume, gradually increasing a flow rate value from zero flow rate. It is a graph which shows the error of a flow sensor at the time of changing a flow, and shows the example of vertical rise. It is a graph which shows the error of a flow sensor at the time of changing a flow, and shows the example of vertical fall. It is a graph which shows the error of a flow sensor at the time of changing a flow rate, and shows the example at the time of using it by calibrating by horizontal mounting and using it by vertical start-up. It is a graph which shows the error of a flow sensor at the time of changing a flow, and shows the example at the time of correcting with a correction coefficient. It is a 1st flowchart which shows the flow volume calibration method which concerns on this embodiment, Comprising: The experimental process performed in order to grasp | ascertain a change point flow rate and a 2nd change point flow rate is shown. It is a 2nd flowchart which shows the flow volume calibration method which concerns on this embodiment, Comprising: The process performed in order to calibrate a flow sensor is shown. It is a 3rd flowchart which shows the flow volume calibration method which concerns on this embodiment, Comprising: The experimental process performed for calculation of a correction coefficient is shown. It is a flowchart which shows the flow volume calculation method which concerns on this embodiment. It is a block diagram of the solar hot water supply system containing the reduction calorie | heat amount calculation apparatus which concerns on a modification.

  First, prior to describing the flow rate calibration device, the flow rate calibration method, and the reduced heat amount calculation device 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 reduced heat quantity calculation device 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 the 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 reduced heat amount calculation apparatus 5 according to the present embodiment will be described. The reduced heat amount calculation device 5 calculates and integrates and displays the amount of heat reduced by using the solar water heater 2, and includes a first temperature sensor 51, a second temperature sensor 52, a flow rate sensor 53, and a calculation. A display 54 and a home display 55 are provided. Note that the reduced heat quantity calculation device 5 may have a function of calculating and integrating the reduced gas charge and carbon dioxide emission amount in addition to the heat quantity.

  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 flow sensor 53 is of an impeller type, for example, and is configured to output a number of pulses corresponding to the number of rotations of the impeller when preheated hot water flows. In the following description, the flow sensor 53 is described as an impeller type, but the present invention is not limited to this, and the flow sensor 53 may have another configuration.

  The calculation display 54 has a function of calculating and integrating and displaying the amount of heat and the amount of carbon dioxide reduced by using the solar water heater 2. Note that the display function is also installed in the home display 55, and the reduced amount of heat and carbon dioxide are displayed on the calculation display 54 and the home display 55.

  FIG. 2 is a configuration diagram showing the calculation display 54 according to the present embodiment. As shown in FIG. 2, the calculation display 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 amount of heat, 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 calculates the reduced fuel cost and the amount of carbon dioxide.

  Further, the reduced heat 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. 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 CPU 54a1. In addition, in this embodiment, although the display part 54c is provided in the main-body part of the reduction calorie | heat amount calculation apparatus 5 installed in the outdoors, it may not be limited to this but may be provided in the house like the home display 55. .

  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.

  FIG. 3 is a functional block diagram of the calculation display 54 shown in FIGS. 1 and 2. As shown in FIG. 3, the calculation display 54 includes a correlation data storage unit (correlation data storage unit) 54e, a flow rate calculation unit (flow rate calculation unit) 54f, and a reduction amount calculation unit (reduction heat amount calculation unit) 54g. I have.

  The correlation data storage unit 54e stores correlation data between the output (number of pulses in the present embodiment) obtained from the flow sensor 53 and the flow rate value. Specifically, the correlation data storage unit 54e stores a calculation formula for calculating a flow rate value from the number of pulses obtained from the flow rate sensor 53 as correlation data.

  The flow rate calculation unit 54f calculates a flow rate value based on the correlation data stored in the correlation data storage unit 54e when an output is obtained from the flow rate sensor 53.

  The reduction amount calculation unit 54g calculates various reduction amounts such as the amount of heat, the amount of carbon dioxide, and the fuel cost reduced by using the solar water heater 2. Specifically, the reduction amount calculation unit 54g includes the flow rate value calculated by the flow rate calculation unit 54f, the temperature of the cold water detected by the first temperature sensor 51, and the temperature of the preheated hot water detected by the second temperature sensor 52. From this, the amount of heat reduced is calculated. The reduction amount calculation unit 54g calculates a reduction fuel cost from the reduction heat amount, the hot water supply efficiency, and the fuel unit price. Similarly, the reduction amount calculation unit 54g calculates the reduced carbon dioxide amount from the reduced heat amount, the hot water supply efficiency, and the carbon dioxide generation amount per unit fuel.

  Here, in order to calculate the reduction amount accurately, it is necessary to accurately calculate the flow rate from the output of the flow rate sensor 53. However, in general, the flow rate sensors 53 have individual differences, and the number of pulses output with respect to the flow rate of the preheated hot water flowing is different.

  FIG. 4 is a graph showing the flow rate-output characteristics of the impeller-type flow rate sensor 53. As shown in FIG. 4, each flow rate region has an error of about 8% to 20% with respect to the median value. Therefore, in order to calculate the flow rate with high accuracy, it is necessary to perform calibration.

  FIG. 5 is a block diagram showing the flow rate calibration device 6 according to the present embodiment. As shown in FIG. 5, the flow rate calibration device 6 includes an output storage unit (output storage unit) 6a and a flow rate calibration unit (flow rate calibration unit) 6b. In addition, this flow volume calibration apparatus 6 is comprised by the personal computer etc., for example.

  The output storage unit 6a stores the output from the flow sensor 53. The flow rate calibration unit 6 b calibrates the correlation data stored in the correlation data storage unit 54 e of the calculation display 54.

  Next, an outline of the flow rate calibration method according to the present embodiment will be described. In performing calibration, the flow sensor 53 is first arranged on the pipe. Further, the output from the flow sensor 53 is connected to be input to the flow rate calibration device 6. Next, water or the like having a known flow rate value is flowed into the pipe.

  Then, the number of pulses output from the flow sensor 53 is stored in the output storage unit 6a. As a result, the flow rate calibration unit 6b calibrates the correlation data stored in the correlation data storage unit 54e so that the known flow rate value matches the number of output pulses.

  Here, in order to increase the measurement accuracy of the flow rate, it is desirable to calibrate by storing water having a known flow rate value as much as possible into the pipe, storing the number of pulses to be output. However, in this case, man-hours are required for calibration, and the productivity of the calculation display 54 is lowered despite the use of the inexpensive flow rate sensor 53. 5 will cause a significant cost increase.

  Therefore, in the flow rate calibration method according to the present embodiment, calibration is performed at three points of the rated minimum flow rate, the rated maximum flow rate, and the change point flow rate, so that an increase in cost is suppressed while ensuring a certain accuracy. Details will be described below.

  Generally, it is assumed that the pulse output from the flow sensor 53 and the flow rate are in a completely proportional relationship. Therefore, the correlation data stored in the correlation data storage unit 54e should be expressed by y = cx (c is a constant, y is a flow rate value, and x is the number of pulses).

  However, the present inventors have found that the flow rate of preheated hot water and the rotational speed of the impeller are not in a completely proportional relationship. FIG. 6 is a graph showing the relationship between the flow rate and the output (number of pulses) from the flow rate sensor 53.

  First, as shown in FIG. 6, when the flow rate is zero, the number of output pulses is also zero. Then, it is assumed that the number of output pulses at the maximum rated flow rate F2 is P2, and a straight line connecting zero flow rate to the maximum rated flow rate F2 is defined as y = cx. In this case, as is apparent from FIG. 6, the flow rate-output characteristic (described by a solid line) does not match y = cx. That is, it can be said that the flow rate and the output are not completely proportional.

More specifically, the inventors of the present invention describe the gradient of the flow rate-output characteristic from the flow rate (for example, 5 L / min) F3 that is about 20% of the rated maximum flow rate (for example, 25 L / min) F2 to the rated maximum flow rate F2. found gradient of the output characteristic (i.e., a ₂₎ and are different - that is, a _3), the flow rate from the nominal minimum flow rate F1 to flow F3 to be approximately 20% of the rated maximum flow rate F2. Since the gradients are different, the flow rate F3 is referred to as a change point flow rate that is a change point of the output characteristics of the flow rate sensor 53.

Here, in the flow rate range from zero flow rate to the rated minimum flow rate F1 (for example, 1.5 L / min), the flow rate-output characteristic is y = a ₁ x and does not match y = cx. However, since this flow rate region is less than the rating, there is no problem even if y = cx does not coincide.

  In the following description, the flow rate from zero to the rated minimum flow rate F1 is referred to as the extremely low flow rate region, the rated minimum flow rate F1 to the change point flow rate F3 is referred to as the low flow rate region, and the change point flow rate F3 to the rated maximum flow rate F2 is referred to. It is called a high flow rate region.

  FIG. 7 is a graph showing an error of the flow sensor 53 when the flow rate is changed. FIG. 7 shows an error from a straight line (hereinafter referred to as a calibration curve A) connecting from the flow rate zero (zero pulse number) to the rated maximum flow rate (pulse number actual measurement value).

  As shown in FIG. 7, in the flow rate sensor 53, the number of pulses obtained in the flow region with a flow rate of 10 L / min or more is positioned on the calibration curve A, but when the flow rate is less than 10 L / min, the error increases as the flow rate decreases. There is a tendency.

  As described above, the flow rate-output characteristics of the flow rate sensor 53 are not completely proportional. Therefore, in the flow rate calibration device 6 according to the present embodiment, calibration is performed at three points of the rated minimum flow rate, the rated maximum flow rate, and the change point flow rate, so that an increase in cost is suppressed while ensuring a certain accuracy.

Specifically, the correlation data storage unit 54e stores basic correlation data of y = a ₁ x, y = a ₂ x + b ₂ , and y = a ₃ x + b ₃ , and the flow rate calibration unit 6b is the rated minimum Calibration is performed by calculating each value of a ₁ , a ₂ , b ₂ , a ₃ , and b ₃ from the number of pulses of the flow rate, the rated maximum flow rate, and the change point flow rate.

  Note that the change point flow rate is substantially common to the same type of flow rate sensors 53. For this reason, the operator measures the number of pulses by flowing water up to the rated maximum flow rate while gradually increasing the flow rate value from the rated minimum flow rate to one flow rate sensor 53 as a sample in advance. It is possible to know the change point flow rate in the type of flow rate sensor 53.

  FIG. 8 is a diagram showing measured data of the number of pulses when water or the like up to the rated maximum flow rate is flowed while gradually increasing the flow rate value from zero flow rate. As shown in FIG. 8, at the flow rate F3 that is the changing point flow rate, the gradient does not change clearly as shown in FIG. That is, the gradient gradually changes as the flow rate increases around the flow rate F3, and it can be said that it is difficult to specify the changing point flow rate F3. Therefore, in this embodiment, not only the flow rate F3 shown in FIG. 8 but also its peripheral flow rate (for example, about ± 30%) is included in the concept of the change point flow rate F3, and the flow rate F3 and its peripheral flow rate are changed. The calibration shown in this embodiment may be performed as the flow rate F3.

Here, the characteristics of the flow rate sensor 53 tend to change in the low flow rate range depending on the mounting posture. FIG. 9 is a graph showing the error of the flow sensor 53 when the flow rate is changed, and shows an example of horizontal mounting. FIG. 10 is a graph showing an error of the flow sensor 53 when the flow rate is changed, and shows an example of vertical startup. Further, FIG. 11 is a graph showing an error of the flow rate sensor 53 when the flow rate is changed, and shows an example of vertical falling. 9 to 11 show errors from the two straight lines y = a ₂ x + b ₂ and y = a ₃ x + b ₃ (hereinafter referred to as calibration curve B).

  As shown in FIGS. 9 to 11, the errors are different in the three postures of horizontal mounting, vertical rising, and vertical falling. More specifically, as shown in FIG. 9, when the flow sensor 53 is horizontally mounted, the error tends to increase in a low flow rate region less than the change point flow rate described above. As shown in FIG. 10, when the flow rate sensor 53 is in a vertical startup state, a slight error occurs in a low flow rate region that is less than the change point flow rate described above. Moreover, as shown in FIG. 11, when the attitude | position of the flow sensor 53 is a vertical fall, an error with the calibration curve B is hardly seen.

  Accordingly, it is desirable to perform calibration according to the mounting posture, but the mounting posture when actually used at home or the like is unknown at the time of production. For this reason, in this embodiment, calibration is performed in advance in one posture.

For example, when the horizontal mounting is predicted to be the most, the flow sensor 53 is mounted horizontally on the pipe. Then, as described above, calibration is performed at three flow rates. In this case, as shown in FIG. 9, even if calibration is performed at three flow rates as described above and y = a ₂ x + b ₂ and y = a ₃ x + b ₃ are reflected in the correlation data, the flow rate is 1.5 to An error occurs in a low flow rate range (less than the change point flow rate) of 5.0 L / min. This is because, due to the positional relationship between the bearing of the flow rate sensor 53 and the shaft, a second change point flow rate that becomes a change point of the output characteristics of the flow rate sensor 53 may occur in a basin less than the change point flow rate. is there.

For this reason, preferably, not only the rated minimum flow rate, the rated maximum flow rate, and the change point flow rate, but also the water at the second change point flow rate flows through the pipe. The output storage unit 6a stores not only the number of pulses at the rated minimum flow rate, the rated maximum flow rate, and the change point flow rate, but also the number of pulses at the second change point flow rate. Then, the flow rate calibration unit 6b calibrates the correlation data stored in the correlation data storage unit 54e based on the rated minimum flow rate, the rated maximum flow rate, the change point flow rate, and the number of pulses at the second change point flow rate. Thereby, when the flow sensor 53 is horizontally mounted at home or the like, the accuracy can be further improved. In this case, the correlation data storage unit 54e stores not only y = a ₁ x, y = a ₂ x + b ₂ , and y = a ₃ x + b ₃ but also basic correlation data y = a ₂ 'x + b ₂ '. Keep it. This is because four formulas are required for calibration at four points.

  In the above description, the correlation data is calibrated by adding the number of pulses of the second change point flow rate. However, the present invention is not limited to this, and a correction coefficient is calculated and the reduced heat amount calculation device 5 is actually used. At this time, the flow rate value obtained based on the correlation data may be corrected by a correction coefficient.

  Furthermore, for the second change point flow rate, one flow rate sensor 53 is used as a sample in the same way as the change point flow rate, and the number of pulses is increased by flowing water up to the rated maximum flow rate while gradually increasing the flow rate value from the rated minimum flow rate. By measuring, the second change point flow rate can be known. Similarly to the change point flow rate, the gradient does not change clearly in the second change point flow rate, so the peripheral flow rate is also included in the concept of the second change point flow rate, and the peripheral flow rate is changed to the second change point flow rate. As the point flow rate, the calibration shown in the present embodiment may be performed.

  FIG. 12 is a graph showing the error of the flow rate sensor 53 when the flow rate is changed, and shows an example in which calibration is performed with horizontal mounting and used for vertical startup. As described above, for example, when calibration is performed with horizontal mounting and used with horizontal mounting, the measurement accuracy can be improved. However, as shown in FIG. 12, when calibration is performed with horizontal mounting and used with vertical start-up, the accuracy deteriorates.

  Therefore, in the present embodiment, the flow rate value is set when the flow rate sensor 53 is installed (that is, when the reduced heat amount calculation device 5 is installed) so that accuracy can be ensured even if it is calibrated in one posture in advance and used in different postures. Be corrected.

  Specifically, assuming that the calibrated flow rate sensor 53 is used in another posture while calibrating in one posture in advance, one of the calibrated flow rate sensors 53 is used as a sample, Attach to the pipe in a different posture from that used during calibration. And the flow volume memory | storage part 6a memorize | stores the pulse number output by increasing a flow volume gradually from a rated minimum flow volume to a rated maximum flow volume.

  Then, the flow rate calibration unit 6b calculates a correction coefficient corresponding to the flow rate, for example, in order to eliminate an error as shown in FIG. 12, and stores the correction coefficient in correlation data so that it may be used in a different posture. Stored in the unit 54e.

  FIG. 13 is a graph showing an error of the flow sensor 53 when the flow rate is changed, and shows an example in which correction is performed using a correction coefficient. As shown in FIG. 13, it can be seen that the error as shown in FIG. 12 is reduced by correcting using the correction coefficient.

  FIG. 3 will be referred to again. In order to perform correction with the correction coefficient corresponding to the mounting posture as described above, the calculation display 54 includes a posture information input unit (posture information input unit) 54h and a posture correction unit (posture correction unit) 54i. .

  The posture information input unit 54h inputs the mounting posture information related to the mounting posture of the flow sensor 53. For example, the posture information input unit 54h inputs the mounting posture information by receiving an external switch operation or a signal from a transmitter. It is.

  The posture correction unit 54i corrects the flow rate value calculated by the flow rate calculation unit 54f in accordance with the posture information input by the posture information input unit 54h. The posture correction unit 54i corrects the calculated flow rate value when the posture indicated by the posture information input by the posture information input unit 54h is different from one calibrated posture.

  Next, details of the flow rate calibration method and the flow rate calculation method according to the present embodiment will be described. In the calibration of the flow rate, the operator first selects, for example, one flow sensor 53 as a sample, and performs the experimental process shown in FIG. 14 to grasp the change point flow rate and the second change point flow rate. Then, steps S11 to S14 shown in FIG. 15 are performed, and then an experimental process shown in FIG. 16 is performed to calculate a correction coefficient. Then, the worker performs a process of steps S11 to S15 shown in FIG. 15 by using the grasped change point flow rate, the second change point flow rate, and the calculated correction coefficient, so that the flow rate calibrated sensors can be obtained in large quantities. Will be produced.

  FIG. 14 is a first flowchart showing the flow rate calibration method according to the present embodiment, and shows an experimental process performed to grasp the change point flow rate and the second change point flow rate.

  As shown in FIG. 14, the operator first installs a flow sensor 53 as a sample in the pipe (S1). At this time, for example, when the flow sensor 53 is calibrated by horizontal mounting, the flow sensor 53 as a sample is mounted horizontally. That is, the mounting orientation of the sample and the mounting orientation of the flow rate sensor 53 to be calibrated are associated with each other.

  Next, the worker gradually increases the flow rate from the rated minimum flow rate, and generates a flow rate up to the rated maximum flow rate (S2). At this time, the output storage unit 6a stores the number of output pulses at a flow rate from the rated minimum flow rate to the rated maximum flow rate.

  Thereafter, the operator grasps the change point flow rate and the second change point flow rate (S3). At this time, the operator grasps the change point flow rate and the second change point flow rate from the degree of change in the number of output pulses obtained in step S2. At this time, as described above, the worker may grasp the peripheral flow rate as the change point flow rate and the second change point flow rate. The flow rate calibration device 6 may calculate the change point flow rate and the second change point flow rate by calculation based on the number of pulses, not limited to the operator. In this case, for example, the flow rate calibration device 6 may use the flow rate with the highest gradient change amount as the change point flow rate and the second change point flow rate, specify a flow rate range where the gradient change exceeds a certain value, and change its median value. A point flow rate and a second change point flow rate may be used. Even when the flow rate calibration device 6 grasps the change point flow rate and the second change point flow rate, the peripheral flow rate may be the change point flow rate and the second change point flow rate.

  Further, depending on the mounting posture, the second change point flow rate may not be almost confirmed as shown in FIG. In such a case, in the process of step S3, only the change point flow rate may be grasped, and the second change point flow rate may not be grasped.

  And after grasping | ascertaining a change point flow volume etc. as mentioned above, the process shown in FIG. 14 is complete | finished.

  FIG. 15 is a second flowchart showing the flow rate calibration method according to the present embodiment, and shows steps performed for calibrating the flow rate sensor 53.

  As shown in FIG. 15, the worker first installs a flow sensor 53 on the pipe (S11). At this time, the flow sensor 53 is installed in the pipe in the same posture as the sample attached when grasping the change point flow rate or the like.

  Next, the worker generates four flow rates of a rated minimum flow rate, a rated maximum flow rate, a change point flow rate, and a second change point flow rate (S12). Thereby, the output memory | storage part 6a memorize | stores the number of output pulses in 4 flow volume (S13).

  Thereafter, as described above, the flow rate calibration unit 6b calibrates the correlation data stored in the correlation data storage unit 54e from the number of pulses of the four flow rates (S14). Next, the flow rate calibration unit 6b stores a correction coefficient corresponding to the attitude of the flow rate sensor 53 in the correlation data storage unit 54e (S15), and the process shown in FIG. 14 ends.

  In addition, the correction coefficient memorize | stored in step S15 is previously calculated | required for every attitude | position different from the attitude | position of the flow sensor 53 installed in step S11. Specifically, the correction coefficient is obtained through the process shown in FIG.

  FIG. 16 is a third flowchart showing the flow rate calibration method according to the present embodiment and shows an experimental process performed for calculating a correction coefficient.

  As shown in FIG. 16, first, the calibrated flow rate sensor 53 calibrated by executing the processing from step S11 to step S14 shown in FIG. 15 is installed in a posture different from that at the time of calibration (S21).

  Next, the worker gradually increases the flow rate from the rated minimum flow rate, and generates a flow rate up to the rated maximum flow rate (S22). At this time, the output storage unit 6a stores the number of output pulses at a flow rate from the rated minimum flow rate to the rated maximum flow rate.

  Thereafter, the flow rate calibration unit 6b compares the flow rate-output characteristic of the calibrated flow rate sensor 53 with the flow rate-output characteristic of the flow rate sensor 53 installed in a different posture, and calculates a correction coefficient from the error (S23). ). Thereafter, the process shown in FIG. 16 ends. Note that the process shown in FIG. 16 is repeatedly executed for each different posture.

  FIG. 17 is a flowchart showing a flow rate calculation method according to this embodiment. Note that the process shown in FIG. 17 is a process executed by the reduced heat amount calculation apparatus 5 including the calibrated flow rate sensor 53.

  As shown in FIG. 17, first, the calculation display unit 54 determines whether or not a flow rate has occurred (S31). When the flow rate is not generated (S31: NO), this process is repeated until it is determined that the flow rate has occurred. On the other hand, when it is determined that the flow rate is generated (S31: YES), the flow rate calculation unit 54f measures the flow rate pulse output from the flow rate sensor 53 (S32).

  Next, the flow rate calculation unit 54f determines the flow rate classification from the pulse obtained in step S32 (S33). That is, the flow rate calculation unit 54f determines whether the generated flow rate corresponds to an extremely low flow rate range, a low flow rate range, or a high flow rate range.

Next, the flow rate calculation unit 54f selects a calculation formula corresponding to the category (S34). That is, the flow rate calculation unit 54f selects the calculation formula y = a ₁ x when the category determined in step S33 is an extremely low flow rate region, and when the determined category is the low flow rate range, y = Calculation formula of a ₂ x + b ₂ is selected. Similarly, the flow rate calculation unit 54f selects a calculation formula y = a ₃ x + b ₃ when the determined segment is the high flow rate region. In the case of calibration including the second flow rate change point, the low flow rate region is further subdivided into the first low flow rate region and the second low flow rate region, and the calculation formula of y = a ₂ x + b ₂ Or a calculation formula of y = a ₂ ′ x + b ₂ ′ is selected.

  Thereafter, the flow rate calculation unit 54f calculates the flow rate (S35). At this time, the flow rate calculation unit 54f calculates the flow rate from the calculation formula selected in step S34 and the flow rate pulse obtained in step S32.

  Next, the calculation display 54 determines whether or not the attitude of the flow sensor 53 is different from that during calibration (S36). Here, posture information of the flow sensor 53 at the time of installation is input to the calculation display 54 in advance via the posture information input unit 54h. For this reason, the calculation display 54 determines whether or not the posture is different based on the posture information of the flow sensor 53 input in advance.

  When it is determined that the posture of the flow sensor 53 is different from that at the time of calibration (S36: YES), the posture correction unit 54i corrects the flow rate value calculated by the flow rate calculation unit 54f (S37). At this time, the posture correction unit 54i reads the corresponding correction coefficient among the correction coefficients for each posture stored in the correlation data storage unit 54e in advance, and corrects the flow rate value. Thereafter, the process shown in FIG. 17 ends.

  On the other hand, when it is determined that the posture of the flow sensor 53 is not different from that at the time of calibration (S36: NO), the processing shown in FIG.

  In this manner, according to the flow rate calibration device 6 and the flow rate calibration method according to the present embodiment, a fluid having three known flow rate values, that is, the rated minimum flow rate F1, the rated maximum flow rate F2, and the change point flow rate F3, is detected as a flow rate sensor. 53, store the obtained output, and calibrate the correlation data so that the stored output matches the three known flow values on the correlation data. Here, when the fluid from the low flow rate range to the high flow rate range is flowed to the flow rate sensor 53, the inventors of the present invention flow rate-output characteristics gradient and change from the rated minimum flow rate F1 to the change point flow rate F3. It was found that the gradient from the point flow rate F3 to the rated maximum flow rate F2 is different. For this reason, by calibrating based on the output obtained with the fluid having the three known flow values, the accuracy can be improved even with the flow sensor 53 that is inexpensive and inferior in accuracy. In particular, in the present invention, even if calibration is performed with only three points, a certain degree of accuracy can be ensured, so that an increase in cost due to calibration can be suppressed. Therefore, it is possible to measure the flow rate for calculating the reduced heat amount with higher accuracy while suppressing an increase in cost.

  Further, according to the flow rate calibration device 6 and the flow rate calibration method according to the present embodiment, the second change point flow rate that becomes the change point of the output characteristics of the flow rate sensor 53 in the flow rate range from the rated minimum flow rate F1 to the change point flow rate F3. The obtained fluid is flowed to the flow sensor 53, and the obtained output is further stored, and the correlation data is stored so that the stored output matches the three known flow values and the second change point flow on the correlation data. Calibrate. Here, the present inventors have found that there is a second change point flow rate that becomes a change point of the output characteristics of the flow rate sensor 53 in the flow rate region below the change point flow rate F3. For this reason, it is possible to further improve the flow measurement accuracy by calibrating based on the output when the second change point flow is passed.

  Furthermore, according to the flow rate calibration device 6 and the flow rate calibration method according to the present embodiment, a correction coefficient corresponding to the flow rate is stored in the correlation data storage unit 54e below the change point flow rate F3. Here, the present inventors have found that there is a second change point flow rate that becomes a change point of the output characteristics of the flow rate sensor 53 in the flow rate region below the change point flow rate F3. For this reason, when the flow rate less than the change point flow rate F3 is calculated at the stage where the reduced heat amount calculation device 5 is actually used by storing a correction coefficient corresponding to the flow rate when the flow rate is less than the change point flow rate F3. A correction coefficient can be multiplied, and the flow rate measurement accuracy can be further enhanced.

  Further, according to the reduced heat quantity calculation device 5 according to the present embodiment, the correlation data is obtained by supplying a fluid having three known flow values of the rated minimum flow rate F1, the rated maximum flow rate F2, and the change point flow rate F3 to the flow rate sensor 53. On the other hand, the output obtained by flowing is calibrated so that three known flow rate values match. Here, when the fluid from the low flow rate range to the high flow rate range is flowed to the flow rate sensor 53, the inventors of the present invention flow rate-output characteristics gradient and change from the rated minimum flow rate F1 to the change point flow rate F3. It was found that the gradient from the point flow rate F3 to the rated maximum flow rate F2 is different. For this reason, the reduced calorific value calculation device 5 calibrated based on the output obtained with the fluid having the three known flow values is constant even if the flow sensor 53, which is inexpensive and inferior in accuracy, is used. Accuracy is ensured. In particular, the reduced heat amount calculation device 5 is calibrated at three points, and the cost increase is suppressed as compared with the case where calibration is performed at multiple points. Therefore, it is possible to measure the flow rate for calculating the reduced heat amount with higher accuracy while suppressing an increase in cost.

  Further, according to the reduced heat amount calculation device 5 according to the present embodiment, the correlation data is calibrated in advance in one posture, and is calculated when the posture indicated by the inputted posture information is different from one posture in advance. Correct the flow value. For this reason, for example, when the flow sensor 53 is an impeller type, even if the sliding resistance between the shaft and the bearing of the impeller differs from that at the time of calibration depending on the mounting posture, a decrease in accuracy can be suppressed. In particular, since the correlation data is calibrated in advance in one posture, it is not necessary to calibrate for each mounting posture, which can contribute to a reduction in installation man-hours.

  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 flow sensor 53 has been described by taking an impeller type as an example. However, the flow rate sensor 53 is not limited to this, and the flow rate and output are completely as shown in FIG. Applicable if there is a tendency that is not proportional.

  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.

  Moreover, in the solar hot water supply system 1 which concerns on this embodiment, although the one mixing valve 3 is provided, you may provide two or more valves not only in this. Further, a valve other than the mixing valve 3 may be provided.

  In addition, the flow rate calibration device 6, the flow rate calibration method, and the reduced heat amount calculation device 5 according to the present embodiment are applied to the solar hot water supply system 1, but are not limited thereto, and the flow rate sensor 53 is used. Any device that measures the flow rate can be applied to other devices.

  Furthermore, in this embodiment, the 2nd temperature sensor 52 and the flow sensor 53 may be arrange | positioned as follows. FIG. 18 is a configuration diagram of the solar hot water supply system 1 including the reduced heat amount calculation device 5 according to the modification.

  As shown in FIG. 18, the second temperature sensor 52 and the flow rate sensor 53 may be provided on the downstream side of the mixing valve 3 (more specifically, on the downstream side of the mixing valve 3 and the upstream side of the water heater 4). Good. In this case, the flow rate sensor 53 uses the mixed water in which the preheated hot water and the cold water are mixed as the detection target water, and performs output according to the flow rate of the detection target water. Further, the second temperature sensor 52 also detects the temperature of the detection target water. As described above, in the embodiment shown in FIG. 1, the preheated hot water supplied from the solar water heater 2 is the detection target water, and the second temperature sensor 52 and the flow rate sensor 53 are the temperature and flow rate of the preheated hot water that is the detection target water. However, the present invention is not limited to this, and the temperature and flow rate may be detected using a mixed water in which preheated hot water and cold water are mixed as detection target water.

  In addition, even if it is configured as in the modified example, the calculation of the reduced heat quantity can be performed without any problem. This will be specifically described below. First, when the preheated hot water is the detection target water, assuming that the flow rate of the preheated hot water is R1 and the temperature is T1, and the temperature of the cold water is T2, the reduced amount of heat is (T1-T2) · R1. Calculated based on

  On the other hand, when the mixed water is the detection target water and the temperature of the mixed water is T3 and the flow rate is R3, the reduced heat quantity is calculated based on (T3-T2) · R3. . Here, T3 = {(T1 · R1) + (T2 · R2)} / (R1 + R2). R2 is the flow rate of cold water mixed with preheated hot water. Therefore, R3 = R1 + R2.

  From these relational expressions, (T3-T2) · R3 is as follows. That is, (T3-T2) * R3 = T3 * R3-T2 * R3 = {(T1 * R1) + (T2 * R2)}-T2 * R3 = {(T1 * R1) + (T2 * R2)}- T2 · (R1 + R2) = T1 · R1−T2 · R1 = (T1−T2) · R1. Therefore, even if configured as in the modification, the calculation of the reduced heat quantity can be performed without any problem.

  Furthermore, the heat quantity reduced by both may be calculated by combining this embodiment and the modification shown in FIG.

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 heat quantity calculation device 51 First temperature sensor 52 Second temperature sensor 53 Flow rate sensor 54 Calculation display 54a MPU
54a1 CPU
54a2 ROM
54a3 RAM
54b Memory section 54c Display section 54d Interface section 54e Correlation data storage section (correlation data storage means)
54f Flow rate calculation unit (flow rate calculation means)
54g Reduction amount calculation unit (reduction heat amount calculation means)
54h Posture information input unit (posture information input means)
54i Posture correction unit (posture correction means)
55 Household display device 6 Flow rate calibration device 6a Output storage unit (output storage means)
6b Flow rate calibration unit (flow rate calibration means)

Claims (3)

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 flow rate sensor that performs at least one of preheated hot water supplied from the solar water heater and mixed water in which the preheated hot water and cold water are mixed as detection target water, and performs output according to the flow rate of the detection target water; Correlation data storage means storing correlation data between the output obtained from the flow sensor and the flow value, and when the output is obtained from the flow sensor, based on the correlation data stored by the correlation data storage means, A flow rate calculation means for calculating a flow rate value, a first temperature sensor for detecting the water temperature before being heated by the solar water heater, and a second temperature for detecting the temperature of the detection target water. A sensor, and based on the signal values from the first temperature sensor and the second temperature sensor and the flow rate value calculated by the flow rate calculation means, when heating the water heater by heating the solar water heater A flow rate calibration method for calibrating the flow rate calculation means of a reduced heat amount calculation device that calculates a reduced heat amount that has been reduced,
A fluid having three known flow values of a rated minimum flow rate, a rated maximum flow rate, and a change point flow rate that becomes a change point of the output characteristics of the flow rate sensor in a flow rate range between the rated minimum flow rate and the rated maximum flow rate. An output storing step for storing the output obtained by flowing the sensor;
The correlation data is calibrated so that the output stored in the output storage step matches the three known flow rate values on the correlation data stored by the correlation data storage means, and less than the change point flow rate. Is a flow rate calibration step of storing a correction coefficient corresponding to the flow rate in the correlation data storage means ,
A flow rate calibration method 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 flow rate sensor that performs at least one of preheated hot water supplied from the solar water heater and mixed water in which the preheated hot water and cold water are mixed as detection target water, and performs output according to the flow rate of the detection target water; Correlation data storage means storing correlation data between the output obtained from the flow sensor and the flow value, and when the output is obtained from the flow sensor, based on the correlation data stored by the correlation data storage means, A flow rate calculation means for calculating a flow rate value, a first temperature sensor for detecting the water temperature before being heated by the solar water heater, and a second temperature for detecting the temperature of the detection target water. A sensor, and based on the signal values from the first temperature sensor and the second temperature sensor and the flow rate value calculated by the flow rate calculation means, when heating the water heater by heating the solar water heater A flow rate calibration device that calibrates the flow rate calculation means of a reduced heat amount calculation device that calculates a reduced heat amount that could be reduced,
A fluid having three known flow values of a rated minimum flow rate, a rated maximum flow rate, and a change point flow rate that becomes a change point of the output characteristics of the flow rate sensor in a flow rate range between the rated minimum flow rate and the rated maximum flow rate. Output storage means for storing the output obtained by flowing to the sensor;
The correlation data is calibrated so that the output stored by the output storage unit matches the three known flow rate values on the correlation data stored by the correlation data storage unit, and less than the change point flow rate. Is a flow rate calibration means for storing a correction coefficient corresponding to the flow rate in the correlation data storage means ,
A flow rate calibration 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 flow rate sensor that performs at least one of preheated hot water supplied from the solar water heater and mixed water in which the preheated hot water and cold water are mixed as detection target water, and performs output according to the flow rate of the detection target water; Correlation data storage means storing correlation data between the output obtained from the flow sensor and the flow value, and when the output is obtained from the flow sensor, based on the correlation data stored by the correlation data storage means, A flow rate calculation means for calculating a flow rate value, a first temperature sensor for detecting the water temperature before being heated by the solar water heater, and a second temperature for detecting the temperature of the detection target water. A sensor, and based on the signal values from the first temperature sensor and the second temperature sensor and the flow rate value calculated by the flow rate calculation means, when heating the water heater by heating the solar water heater In the reduced heat quantity calculation device that calculates the reduced heat quantity that could be reduced,
Posture information input means for inputting posture information related to the mounting posture of the flow sensor;
Posture correction means for correcting the flow rate value calculated by the flow rate calculation means according to the posture information input by the posture information input means,
The correlation data stored by the correlation data storage means includes a rated minimum flow rate, a rated maximum flow rate, and a change point flow rate that is a change point of the output characteristics of the flow sensor in a flow rate region between the rated minimum flow rate and the rated maximum flow rate. Are calibrated so that the output obtained by flowing a fluid having the three known flow values to the flow sensor matches the three known flow values, and in one posture in advance. Has been calibrated,
The attitude correction means corrects the flow rate value calculated by the flow rate calculation means when the attitude indicated by the attitude information input by the attitude information input means is different from the one attitude in advance. Calorie calculation device.

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