JP5463114B2 - Operation method of water heater and water heater - Google Patents

Description

The present invention relates to an operation method and a water heater for a hot water heater that heats hot water stored in a hot water storage tank by a heating device equipped with a heat pump and the like, and a solar heat collector.

A solar heat collector that heats the heat medium by solar heat, sends the heat medium heated through the circulation circuit to a heat exchanger (radiator) disposed in the hot water tank, and heats the hot water in the hot water tank; There has been proposed a water heater that has a heating device that operates in a night time zone and that has a heat pump that performs a night heating operation that heats hot water in a hot water storage tank, and a specific example thereof is disclosed in Patent Document 1, for example. .

JP 2002-162109 A

However, in the water heater of Patent Document 1, when the amount of heat secured by the hot water storage tank by the night heating operation of the heating device is always a specific value, the amount of solar heat collected when the daytime weather is fine. Cannot be efficiently supplied to the hot water in the hot water storage tank, and when it is raining during the day, there are problems such as increasing the chance of operating the heating device during the daytime.

Furthermore, since the amount of heat in the hot water storage tank used is generally different between seasons, for example, in summer and winter, if the amount of heat secured in the hot water storage tank is fixed during night heating operation, Most of the hot water in the tank is not used, and in winter, there is a problem that there is not enough hot water for hot water supply and the opportunity to operate the heating device during the day increases. Moreover, the amount of hot water supply per day is not limited to the case where the seasons are different, and may vary from day to day even in the same season.
The present invention has been made in view of such circumstances, and a water heater that fluctuates the amount of hot water in a hot water storage tank to be secured in a night heating operation based on the predicted weather information of the next day and the predicted heat usage of the hot water in the hot water tank of the next day. The purpose is to provide an operation method and a water heater.

The operation method of the hot water supply apparatus according to the present invention that meets the above object is that the hot water in the hot water storage tank is heated by the heating device during the night time, and is further heated by the solar heat collecting device during the daytime. In the method, the hot water supply heat quantity of each day of hot water used from the hot water storage tanks for a plurality of days before the previous day is obtained, and the predicted hot water supply heat quantity calculated from the value of the hot water supply heat quantity of each day is stored in the hot water storage tank. The target heat storage heat amount to be secured, a large value by comparing the maximum value of the heat amount of each day supplied to the hot water storage tank from the solar thermal collector on a plurality of days before the previous day and a predetermined value set in advance and the predicted current heat, on condition that there is an input called "prediction during the day fine", from the target hot-water heat, subtracting the predicted current amount of heat amount of heat supplied by the solar heat collector, a new Target savings The amount of hot water is used, and the hot water in the hot water storage tank is heated in the night time zone by the heating device.

A hot water supply apparatus according to the present invention that meets the above-mentioned object is provided in a hot water storage tank that stores hot water for hot water supply, and has a water supply port to which tap water is supplied and a hot water outlet to discharge hot water, and the hot water storage tank. A temperature measuring means for measuring the temperature of the hot water in the tank, a solar heat collecting device for sending a heat medium heated by solar heat to a heat exchanger arranged in the hot water storage tank via a circulation circuit, and the hot water storage A heating device that is disposed inside or outside the tank and that heats the hot water in the hot water storage tank, and operates the heating device during a night time period, and the hot water storage tank has a target hot water storage heat amount required for hot water supply for one day. A control device that performs a night heating operation that is secured at a predetermined time until the end of the night time zone, and the control device includes a heating device control unit that controls the heating device, and a temperature measurement unit. Hot water in the hot water storage tank A remaining hot water calorie calculating means for detecting a temperature and deriving a remaining hot water calorie, a weather information receiving means for receiving predicted weather information during the day, and a daily heat amount supplied to the hot water storage tank by the solar heat collector. A heat collection amount detecting means for detecting a predicted heat collection amount, and a daily hot water supply load heat amount obtained by subtracting the heat amount of tap water supplied to the hot water storage tank through the water supply port from the heat amount of the hot water discharged from the hot water storage tank. Hot water supply load heat amount calculating means for detecting and recording and calculating a predicted hot water supply load heat amount based on the value of the hot water supply load heat amount for the past multiple days before the previous day is provided, and the heating device control means includes the predicted hot water supply load On the condition that the amount of heat is the target hot water storage amount and the weather information receiving means receives clear sky information, the target hot water amount is further subtracted from the target hot water amount to obtain a new target hot water storage amount, and the remaining hot water heat amount is The heating device activated when less than the new target hot water storage heat, the remaining hot water amount of heat have rows the nighttime heating operation for stopping the heating device when more than the new target hot water storage heat, the condenser heat detector Has a lower limit heat collection amount value preset as the minimum value of the predicted heat collection amount, and the maximum of the heat amount values supplied to the hot water storage tank by the solar heat collection device in the past several days before the previous day. The value is compared with the lower limit heat collection amount value, and a larger value is set as the predicted heat collection amount .

In the hot water supply apparatus according to the present invention, the remaining hot water calorie calculating means detects the temperature of the hot water in the hot water storage tank through the temperature measuring means at a constant time interval during the night time period, and the remaining hot water calorific value. It is preferable that the heating device control means determines whether or not to operate the heating device every time the remaining hot water heat amount is derived.

In the water heater according to the present invention, the predicted weather information can be input through an operation panel signal-connected to the weather information receiving means.

In the operation method of the hot water supply apparatus according to claim 1, when there is an input that “daytime forecast is sunny”, a new target heat storage heat amount is obtained by subtracting the predicted heat collection amount of heat supplied by the solar heat collector. As the hot water in the hot water storage tank is heated by the heating device in the night time zone, the hot water in the hot water storage tank is efficiently heated by the solar heat collector, and the amount of power used can be reduced. It is possible to suppress the discharge amount of hot water and to reduce the heating cost of hot water in the hot water storage tank.

In addition, the maximum value of the amount of heat for each day supplied to the hot water storage tank from the solar heat collecting apparatus for a plurality of days before the previous day is compared with a predetermined value, and a larger value is set as the predicted heat collection amount. Therefore, even if there has been no clear weather in the past few days, the heating device heats the hot water in the hot water storage tank using the expected heat collection value as the amount of heat supplied from the solar heat collector to the hot water storage tank in the fine weather. It is possible.

When the weather information receiving means receives sunny weather information, the hot water heater according to claims 2 to 4 subtracts the predicted heat collection amount as a new target hot water storage amount, and the remaining hot water heat amount is smaller than the new target hot water storage amount. Since the heating device is operated and the heating device is turned off at night when the remaining hot water heat amount is equal to or higher than the new target hot water storage amount, the solar heat collector is heated in the hot water tank by the heat medium heated by solar heat. Hot water can be efficiently heated to reduce the amount of electric power used, and the amount of carbon dioxide emitted can be suppressed, and the heating cost of hot water in the hot water storage tank can be kept low.

In particular, compare the maximum value of the calorific value supplied to the hot water storage tank by the solar heat collector in the past few days before the previous day with the lower limit calorific value that is the minimum value of the predicted calorific value. Since the estimated amount of heat is collected, even if there has been no clear weather in the past few days, the heat storage tank by the heating device is used as the predicted amount of heat collected as the amount of heat that is expected to be supplied from the solar heat collector to the hot water tank during clear weather. It is possible to heat the hot water.

According to a third aspect of the present invention, the remaining hot water calorie calculating means derives the remaining hot water calorie at a constant time interval during the night time, and the heating device control means operates the heating device every time the remaining hot water calorie is derived. Therefore, even if there is a change in the amount of remaining hot water due to hot water from the hot water storage tank during the night time, the operation of the heating device can be determined according to the amount of remaining hot water after the change. It is possible to ensure the amount of stored heat.

In the water heater according to claim 4 , since the predicted weather information is input on the operation panel signal-connected to the weather information receiving means, the weather information receiving means immediately receives the predicted weather information input on the operation panel, And it is possible to acquire it reliably.

It is explanatory drawing of the water heater based on one embodiment of this invention. It is a block diagram of the control apparatus of the water heater.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1 and FIG. 2, a water heater 10 according to an embodiment of the present invention stores hot water for hot water supply, and includes a water supply port 11 through which tap water is supplied and a hot water outlet 12 through which hot water is discharged. The hot water storage tank 13 provided, the temperature measuring means 14 provided in the hot water storage tank 13 for measuring the temperature (° C.) of the hot water in the hot water storage tank 13, and the heat medium heated by solar heat are stored via the circulation circuit 15. A solar heat collecting device 17 for sending to a heat exchanger 16 disposed in the tank 13. Furthermore, the water heater 10 is disposed outside the hot water storage tank 13 and operates an external heating device (an example of a heating device) 18 that heats the hot water in the hot water storage tank 13 and an external heating device 18 during the night time to store hot water. The tank 13 has a control device 19 that performs a night heating operation for securing hot water having a target hot water storage amount necessary for hot water supply for one day at a predetermined time (including the end time) until the end of the night time zone. . This will be described in detail below.

The hot water storage tank 13 includes a first sub-tank 21 having a hot water outlet 12 provided at the ceiling, a second sub-tank 22 provided with a water supply port 11 at the bottom and a heat exchanger 16 disposed inside the lower part, A connecting pipe 23 is provided that connects the bottom of one sub tank 21 and the ceiling of the second sub tank 22 and allows hot and cold water to flow back and forth between the first sub tank 21 and the second sub tank 22. A check valve 24, a pressure reducing valve 25 for adjusting the pressure of tap water, a water supply thermistor 26 for measuring the temperature of tap water, and a check valve 27 are connected in series to the water supply port 11, and a water supply port is connected from a water pipe (not shown). 11, tap water enters the second sub-tank 22.

The hot water storage capacities of the first and second sub-tanks 21 and 22 are each 230 liters. The first sub-tank 21 has different height positions, for example, a ceiling portion, a position 50 liters from the ceiling portion, and a ceiling. First, second, and third hot water storage thermistors 28, 29, and 30 that measure the temperature of hot water are disposed at a position of 150 liters from the section. In addition, the temperature of the hot water is also measured at different height positions, such as the ceiling, the position of 70 liters from the ceiling, the position of 140 liters from the ceiling, and the bottom. Fourth, fifth, sixth, and seventh hot water storage thermistors 31, 32, 33, and 34 are arranged.
Each of the first and second sub tanks 21 and 22 always stores 230 liters of hot water, and by measuring the temperature of the hot water at different height positions of the first and second sub tanks 21 and 22, An approximate value of the amount of heat possessed by the entire hot water in the first and second sub-tanks 21 and 22 can be calculated. The temperature measuring means 14 includes first to seventh hot water storage thermistors 28 to 34.

The external heating device 18 circulates water from a heat pump heater 36 that heats water into hot water and a water intake 37 provided at the bottom of the second sub-tank 22 and sends the water to the heat pump heater 36. There is a pump 38 and a hot water return three-way valve 39 for switching whether the hot water sent from the heat pump heater 36 is the ceiling of the first sub tank 21 or the bottom of the second sub tank 22. doing.
When the heat pump heater 36 is not ready to heat the water taken out from the water intake port 37 immediately after the operation of the heat pump heater 36, the low temperature water sent from the heat pump heater 36 is returned to the hot water return three-way valve 39. Since the low temperature water is supplied to the ceiling of the first sub tank 21, it is possible to prevent the temperature of the hot water in the first sub tank 21 from being lowered. it can.

In the solar heat collector 17, the heated heat medium is supplied to the solar panel 41 that collects solar heat and heats the heat medium, and the heat exchanger 16 provided in the second sub tank 22 via the circulation circuit 15. A solar pump 42 is provided that returns to the solar panel 41 via the circulation circuit 15. In the heat exchanger 16, heat exchange is performed by heating the water in the second sub tank 22 using the heated heat medium as a heat source.
A solar thermistor 43 that measures the temperature of the heat medium heated by the solar panel 41 is attached to the circulation circuit 15, and an inflow that measures the temperature of the heat medium is provided on the heat medium inflow side and the outflow side of the heat exchanger 16. A side thermistor 44 and an outflow side thermistor 45 are arranged.

The circulation circuit 15 is provided with an accumulation tank 46 for absorbing the expansion of the heat medium due to heating, and the accumulation tank 46 has reserve tanks 47 and 48 into which the heat medium expanded from the accumulation tank 46 flows. It is connected.
The circulation circuit 15 is provided with a solar three-way valve 49 for switching the destination of the heat medium sent from the solar panel 41. The solar three-way valve 49 has a temperature difference between the temperature of the heat medium measured by the solar thermistor 43 and the water temperature at the bottom of the second sub-tank 22 measured by the seventh hot water storage thermistor 34, for example, 7 or more. When the temperature is higher than ° C., the heat medium sent from the solar panel 41 is sent to the heat exchanger 16, and when it is lower than 7 ° C., the destination of the heat medium is switched, and the heat medium is not sent to the heat exchanger 16 without being sent to the solar panel 41. A heating medium is sent to the return bypass pipe 50.

In the water heater 10, tap water is mixed with the hot water discharged from the hot water outlet 12 of the first sub tank 21 and the second hot water outlet 52 provided on the ceiling of the second sub tank 22, A hot water supply pipe 53 for supplying hot water to a bathtub or the like is provided.
The hot water supply pipe 53 includes a hot water mixing valve 54 that mixes hot water discharged from the hot water outlet 12 and the second hot water outlet 52, a hot water thermistor 55 that measures the temperature of hot water fed from the hot water mixing valve 54, and a check. A valve 56 and a hot water supply mixing valve 57 for mixing tap water with hot water sent from the hot water mixing valve 54 are connected in series. A check valve 58 is disposed on the incoming side of the tap water to the hot water supply mixing valve 57.
Further, the hot water supply pipe 53 is provided with a flow rate sensor 60 for measuring the flow rate of hot water delivered from the hot water supply mixing valve 57 and a hot water supply thermistor 61 for measuring the temperature of the hot water.

As shown in FIG. 2, the control device 19 of the water heater 10 is configured such that the water temperature at the bottom of the second sub-tank 22 and the temperature of the heat medium sent out from the solar panel 41 via the seventh hot water storage thermistor 34 and the solar thermistor 43. And a heat collection control means 70 for switching the solar three-way valve 49 according to the temperature difference A. The heat collection control means 70 is signal-connected to the solar pump 42, operates the solar pump 42, detects the temperature of the heating medium via the solar thermistor 43, and when the temperature difference A is less than 7 ° C., for example. Until the temperature difference A reaches 7 ° C. or more, the solar pump 42 is periodically operated (for example, every 10 to 20 minutes) and is operated for a certain period of time (for example, 2 to 3 minutes), and the temperature difference A is periodically measured. I do. And when the temperature difference A becomes 7 degreeC or more, the solar three-way valve 49 is switched so that the heat medium sent out from the solar panel 41 may be sent to the heat exchanger 16.

The hot water heater 10 is provided with an operation panel 71 on which a hot water supply temperature input operation of a kitchen or the like is performed, and the control device 19 controls the hot water supply mixing valve 57 and is sent from the hot water mixing valve 54. There is provided hot water supply control means 72 that mixes hot water and tap water to make hot water at the hot water supply temperature input on the operation panel 71. The hot water supply control means 72 is configured to measure the temperature of the ceiling of the first and second sub-tanks 21 and 22 measured by the first and fourth hot water storage thermistors 28 and 31 and the temperature of tap water obtained through the water supply thermistor 26. And the hot water mixing valve 54 and the hot water mixing valve 57 are controlled. Note that the hot water supply control means 72 is connected to the hot water thermistor 55 and the hot water supply thermistor 61, so that the hot water mixing valve 54 is actually measured while measuring the temperature of the hot water discharged from the hot water mixing valve 54 and the hot water mixing valve 57. And the hot water supply mixing valve 57 can be controlled.

In addition, the control device 19 has a predicted amount of heat collected for one day (for example, 24 hours from 7:00 am to 7:00 am on the next day) supplied by the solar heat collecting device 17 to the hot water in the second sub-tank 22. A heat collection amount detecting means 73 for detecting is provided.
The heat collection amount detection means 73 detects the number of revolutions per unit time of a motor (not shown) provided in the solar pump 42 from the solar pump 42, and the flow rate of the heat medium flowing in the circulation circuit 15 per unit time is detected by the solar pump 42. Is read from a table corresponding to the number of rotations of the motor (the flow rate of the heat medium corresponding to the number of rotations of the motor is determined). The heat collection amount detecting means 73 heats the temperature of the heat medium before flowing into the heat exchanger 16 via the inflow side thermistor 44 and the outflow side thermistor 45 and the water in the second sub tank 22 to heat the heat exchanger. The temperature of the heat medium flowing out from 16 is detected, and the amount of heat supplied to the hot water in the second sub tank 22 is detected from the temperature difference and the flow rate of the heat medium flowing in the circulation circuit 15.

Then, the heat collection amount detection means 73 records the heat amount value supplied to the hot water in the second sub tank 22 by the solar heat collection device 17 on the first day for the last several days (before the previous day), for example, seven days, The maximum value of the calorific value for each of the seven days is compared with the lower limit heat collecting value (predetermined value) preset as the minimum value of the predicted heat collecting amount, and the larger value is predicted heat collecting amount Q1 (kilocalories) ).
The lower limit heat collection value is, for example, 5,000 kilocalories, and is determined from the heat collection capacity of the solar panel 41 or the value of the daily heat collection value supplied to the second sub tank 22 from the solar heat collection device 17 in the previous year. It is possible to calculate and determine the lower limit heat collection value for the same period from the actual results. By providing this lower limit heat collection amount value, it is possible to make the predicted heat collection amount Q1 the value of the heat collection amount expected at the time of fine weather even when there is no clear sky for 7 days before the previous day.

Further, the heat collection amount detection means 73 is weighted so as to increase in accordance with the value of the heat amount of each day supplied to the second sub tank 22 from the solar heat collection device 17 on a plurality of days (for example, seven days) before the previous day. The predicted heat collection amount Q1 ′ (kilocalorie) can also be calculated by a weighted average with a mark.
Specifically, assuming that the values for each of the seven days before the previous day are P1 to P7 in descending order and the weighting factors are S1 to S7, the predicted heat collection amount Q1 ′ is calculated by the following equation 1.
Q1 ′ = (1/7) × (P1 × S1 + P2 × S2 + P3 × S3
+ P4 × S4 + P5 × S5 + P6 × S6 + P7 × S7) (Formula 1)

Here, S1 to S7 are values for which the following Expression 2 is satisfied, and further, a relationship of S _n ≧ S _{n + 1} is established, where n is an integer of 1 to 6.
S1 + S2 + S3 + S4 + S5 + S6 + S7 = 7 (Formula 2)
Specifically, the values of S1 to S7 are, for example, S1 = 2, S2 = 1.5, S3 = 1, S4 = 1, S5 = 0.5, S6 = 0.5, S7 = 0.5, respectively. Can be.
It should be noted that which one of Q1 and Q1 ′ is calculated and used as the predicted heat collection amount by the heat collection amount detection means 73 can be set in advance.

The controller 19 detects the temperature of the hot water stored in the first and second sub-tanks 21 and 22 via the first to seventh hot-water storage thermistors 28 to 34, and the first and second sub-tanks. There is provided a remaining hot water calorie calculating means 74 for deriving the remaining hot water calories 21 and 22.
The temperatures obtained by subtracting the temperature of the tap water measured by the feed water thermistor 26 from the temperature of the hot water of the first and second sub-tanks 21 and 22 measured by the first to seventh hot water storage thermistors 28 to 34 are T1 to T7, respectively. Further, between the first and second hot water storage thermistors 28 and 29, between the second and third hot water storage thermistors 29 and 30, between the third and fourth hot water storage thermistors 30 and 31, and between the fourth and fifth hot water storage thermistors 31. , 32, between the fifth and sixth hot water storage thermistors 32, 33, and between the sixth and seventh hot water storage thermistors 33, 34, the amount of hot water (liters) stored as V1 to V6, respectively, The calorie calculation means 74 calculates the remaining hot water calorie Q2 (kilocalorie) according to the following equation 3.
Q2 = (T1 + T2) × 0.5 × V1 + (T2 + T3) × 0.5 × V2
+ (T3 + T4) × 0.5 × V3 + (T4 + T5) × 0.5 × V4
+ (T5 + T6) × 0.5 × V5 + (T6 + T7) × 0.5 × V6 (Formula 3)
Here, for example, V1 to V6 are 50 liters, 100 liters, 80 liters, 70 liters, 70 liters, and 90 liters, respectively.

In addition, the control device 19 supplies the first heat storage tank 13 through the water supply port 11 based on the amount of hot water discharged from the first and second sub tanks 21 and 22 through the hot water outlet 12 and the second hot water outlet 52. A hot water supply load heat amount calculating means 75 is provided for detecting and recording the daily hot water load heat amount obtained by reducing the heat amount of the tap water supplied to the second sub tank 22.
Specifically, the amount of hot water discharged from the hot water supply mixing valve 57 detected via the flow rate sensor 60 is Vd (liter), and the temperature of the tap water measured by the water supply thermistor 26 from the hot water supply temperature measured by the hot water supply thermistor 61. The hot water supply load heat quantity calculation means 75 calculates the instantaneous hot water supply load heat quantity dQ by the following equation 4 where Td is the temperature obtained by subtracting.
dQ = Vd × Td (Formula 4)

And the hot water supply load calorie | heat amount calculation means 75 performs the integral calculation of dQ in 24 hours from 7:00 am to 7:00 am of the following day, for example, and detects the hot water load heat calorie (kilocalorie) of the day. In addition, since the same amount of hot water discharged from the hot water outlet 12 and the second hot water outlet 52 flows into the first and second sub-tanks 21 and 22 from the water supply port 11, an instantaneous amount is obtained according to Equation 4. A hot water supply load heat quantity dQ is required.

Further, the hot water supply load calorie calculation means 75 gives a weight that increases in accordance with the hot water supply load calorie for the past plural days (for example, the previous day), for example, 7 days, which is recorded (precisely, hot water supply Predicted hot water supply load heat quantity Q3 (kilocalorie) is calculated by a weighted average (with a large weight given to the value of the load heat quantity and a small weight given to the small value). Specifically, assuming that the values for each of the most recent seven days are L1 to L7 in descending order and the weighting factors are K1 to K7, the predicted hot water supply load heat amount Q3 is calculated by the following Equation 5.
Q3 = (1/7) × (K1 × L1 + K2 × L2 + K3 × L3
+ K4 × L4 + K5 × L5 + K6 × L6 + K7 × L7) (Formula 5)

Here, K1 to K7 are values for which the following Expression 6 is satisfied, and further, a relationship of K _n ≧ K _{n + 1} is established, where n is an integer of 1 to 6.
K1 + K2 + K3 + K4 + K5 + K6 + K7 = 7 (Formula 6)
Specifically, the values of K1 to K7 are, for example, K1 = 2, K2 = 1.5, K3 = 1, K4 = 1, K5 = 0.5, K6 = 0.5, K7 = 0.5, respectively. Can be.

The hot water supply load heat quantity calculating means 75 calculates the predicted hot water supply load heat quantity Q3 by the weighted average of Equation 5, and compared to calculating the predicted hot water supply load heat quantity by a simple average, the time zone of the normal power rate during the day In addition, the opportunity to operate the heat pump heater 36 can be reduced, and the heating cost of the hot water in the hot water storage tank 13 can be reduced.
In particular, when the amount of hot water discharged from the first and second sub-tanks 21 and 22 (more precisely, the amount of heat of hot water) fluctuates daily, if the predicted hot water supply load heat amount is calculated by simple averaging, for example, 5 Since the operation of the heat pump heater 36 in the daytime is required with a near-probability, the hot water heating cost is increased, so the calculation of the predicted hot water supply load heat quantity Q3 by Equation 5 greatly reduces the hot water heating cost. Demonstrate the effect.

In addition, the operation panel 71 can input predicted weather information for the next day, for example, clear weather information that “the daytime prediction is clear”, and the control device 19 is connected to the operation panel 71 as a signal. Weather information receiving means 76 for receiving the predicted weather information input at 71 is provided.
The control device 19 measures the temperature of hot water at the hot water outlet 12 of the first sub tank 21 and the second hot water outlet 52 of the second sub tank 22 via the first and fourth hot water storage thermistors 28 and 31, Compared with the hot water supply temperature input on the operation panel 71, a heating device control means 77 for operating the heat pump heater 36 and the circulation pump 38 under a predetermined condition to heat the hot water in the second sub tank 22 is provided. ing. Specifically, the hot water in the second sub tank 22 is heated when the temperature of the hot water at the outlet 12 is lower than the hot water temperature input through the operation panel 71.

The heating device control means 77 is signal-connected to the remaining hot water calorie calculating means 74, and the remaining hot water calorie quantity Q2 from the remaining hot water calorie calculating means 74 at a predetermined time interval, for example, every 10 seconds, at night time. Information can be acquired.
The heating device control means 77 is also connected to the heat collection amount detection means 73, the hot water supply load heat amount calculation means 75, and the weather information reception means 76, and the solar heat collection device 17 is connected to the solar heat collection device 17 from the heat collection amount detection means 73. It is possible to receive information on the predicted heat collection amount Q1 (or predicted heat collection amount Q1 ′) of the daily heat amount supplied to the sub-tank 22 and obtain information on the predicted hot water supply load heat amount Q3 from the hot water supply load heat amount calculation means 75. In addition, it is possible to acquire the predicted weather information input on the operation panel 71 via the weather information receiving means 76.

Prior to the night time period, the heating device control means 77 receives information on the latest predicted heat collection amount Q1 (or predicted heat collection amount Q1 ′) from the heat collection amount detection means 73 and the hot water supply load heat amount calculation means 75 and the predicted hot water supply load heat amount Q3. Each time, the information of the latest remaining hot water calorie Q2 is obtained every time the remaining hot water calorie calculation means 74 derives the remaining hot water calorie Q2 at intervals of 10 seconds after the night time zone. Obtaining and determining whether to operate or stop the external heating means 18.
When the weather information receiving unit 76 has not received the clear sky information from the operation panel 71, the heating device control unit 77 sets the latest predicted hot water supply load heat amount Q3 recorded as the target hot water storage heat amount Q4 and becomes a night time zone. After that, every time the remaining hot water heat quantity Q2 is acquired from the remaining hot water heat quantity calculation means 74 at intervals of 10 seconds, the latest remaining hot water heat quantity Q2 and the target hot water storage heat quantity Q4 are compared.

Then, the heating device control means 77 stops the external heating means 18 when the following expression 7 is satisfied, and operates the external heating means 18 until the expression 7 is satisfied when the following expression 8 is satisfied. The hot water in the first and second sub tanks 21 and 22 is heated.
Q2 ≧ Q4 (Formula 7)
Q2 <Q4 (Formula 8)

Further, the heating device control means 77 receives the clear weather information via the weather information receiving means 76 on condition that the weather information receiving means 76 receives clear sky information from the operation panel 71 (the clear sky information has been input). Receiving and subtracting the latest recorded heat collection amount Q1 (or predicted heat collection amount Q1 ′) further recorded from the target hot water storage heat amount Q4, as a new target hot water storage heat amount Q4 ′, instead of Equations 7 and 8, Whether to operate or stop the external heating means 18 is determined by Equations 9 and 10.
Q2 ≧ Q4 ′ (Formula 9)
Q2 <Q4 '(Formula 10)
That is, the heating device control unit 77 stops the external heating unit 18 when Equation 9 is satisfied, and operates the external heating unit 18 until Equation 9 is satisfied when Equation 10 is satisfied.

In addition, the heat collection control means 70, the hot water supply control means 72, the heat collection amount detection means 73, the remaining hot water heat quantity calculation means 74, the hot water supply load heat quantity calculation means 75, the weather information reception means 76, and the heating device control means 77 are described above. It has a microcomputer storing a program for executing control and the like, and a memory.
The operation panel 71 is provided with a function for canceling the input clear sky information.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, the heating device is provided in a hot water storage tank, and can be configured to have a heating wire for heating hot water in the hot water storage tank. The hot water storage tank is configured to have one tank without two sub tanks. You can also
Moreover, the forecast weather information is not limited to being input on the operation panel, but the weather information receiving means is connected to the Internet line or a dedicated line, and the forecast weather information transmitted from the remote server is periodically received. You can also.
Furthermore, not only sunny weather information but also information such as sunny and cloudy weather can be added as predicted weather information. If the weather information receiving means receives information that is sunny and cloudy, the correction coefficient is added to the predicted heat collection amount during sunny weather. It is also possible to calculate the predicted heat collection amount by multiplying (for example, 0.5).
In the embodiment described above, the plurality of days before the previous day has been described as 7 days. However, other days (m days) may be used. In this case, in the description of the embodiment, “7” Is replaced with “m”.

10: Hot water supply machine, 11: Water supply port, 12: Hot water outlet, 13: Hot water storage tank, 14: Temperature measuring means, 15: Circulation circuit, 16: Heat exchanger, 17: Solar heat collector, 18: External heating device, 19: control device, 21: first sub tank, 22: second sub tank, 23: connecting pipe, 24: check valve, 25: pressure reducing valve, 26: water supply thermistor, 27: check valve, 28: first Hot water storage thermistor 29: second hot water storage thermistor 30: third hot water storage thermistor 31: fourth hot water storage thermistor 32: fifth hot water storage thermistor 33: sixth hot water storage thermistor 34: seventh hot water storage Thermistor, 36: Heat pump heater, 37: Intake port, 38: Circulation pump, 39: Hot water return three-way valve, 41: Solar panel, 42: Solar pump, 43: Solar thermistor, 44: Inflow thermistor, 5: Outflow side thermistor, 46: Accumulation tank, 47, 48: Reserve tank, 49: Solar three-way valve, 50: Bypass pipe, 52: Second hot water outlet, 53: Hot water supply pipe, 54: Hot water mixing valve, 55: Hot water thermistor 56: Check valve 57: Hot water mixing valve 58: Check valve 60: Flow rate sensor 61: Hot water thermistor 70: Heat collection control means 71: Operation panel 72: Hot water control means 73 : Heat collection amount detection means, 74: residual hot water heat amount calculation means, 75: hot water supply load heat amount calculation means, 76: weather information reception means, 77: heating device control means

Claims (4)

In the operation method of the hot water heater in which the hot water in the hot water storage tank is heated by the heating device at night time, and further heated by the solar heat collector in the daytime,
Obtain the hot water load calorific value of each day of hot water used from the hot water storage tanks on multiple days before the previous day,
The predicted hot water load heat amount calculated from the value of the hot water load heat amount for each day is set as the target hot water heat amount to be secured in the hot water storage tank,
The maximum value of the amount of heat for each day supplied to the hot water storage tank from the solar heat collecting device on a plurality of days before the previous day is compared with a preset predetermined value, and the predicted heat collection amount,
On condition that there is an input called "prediction during the day fine", from said target hot-water heat, subtracting the predicted current amount of heat amount of heat supplied by the solar heat collector, a new target hot water storage heat, the A method for operating a water heater, comprising heating the hot water in the hot water storage tank in the night time zone by a heating device. A hot water storage tank for storing hot water for hot water supply and having a water supply port for supplying tap water and a hot water outlet for discharging hot water;
A temperature measuring means provided in the hot water storage tank for measuring the temperature of the hot water in the hot water storage tank;
A solar heat collector for sending a heat medium heated by solar heat to a heat exchanger disposed in the hot water storage tank via a circulation circuit;
A heating device that is disposed inside or outside the hot water storage tank and heats hot water in the hot water storage tank;
A control device that operates the heating device during a night time period and performs a night heating operation to secure a target hot water storage amount necessary for hot water supply to the hot water storage tank for a day at a predetermined time until the end of the night time period; Have
The control device includes a heating device control means for controlling the heating device;
Detecting the temperature of the hot water in the hot water storage tank via the temperature measuring means, and deriving the remaining hot water calorie calculating means,
Weather information receiving means for receiving forecast weather information during the day;
A heat collection amount detecting means for detecting a predicted heat collection amount of a daily heat amount supplied to the hot water storage tank by the solar heat collector;
While detecting and recording the daily hot water supply load heat amount obtained by subtracting the heat amount of tap water supplied to the hot water storage tank from the heat amount of hot water discharged from the hot water storage tank through the water supply port, A hot water supply load heat amount calculating means for calculating a predicted hot water supply load heat amount from the value of the hot water supply load heat amount for a day,
The heating device control means sets the predicted hot water supply load heat amount as the target hot water storage heat amount,
On condition that the weather information receiving means receives sunny weather information, the target hot water heat amount is further subtracted from the predicted heat collection amount to obtain a new target hot water heat amount, and the remaining hot water heat amount is smaller than the new target hot water heat amount. the heating device operates, have rows the nighttime heating operation in which the remaining hot water heat stops the heating device when more than the new target hot-water heat when,
The heat collection amount detection means has a lower limit heat collection amount value preset as a minimum value of the predicted heat collection amount, and the amount of heat supplied to the hot water storage tank by the solar heat collection device in the past several days before the previous day. The hot water heater characterized by comparing the maximum value of the values with the lower limit heat collection amount value and setting the larger value as the predicted heat collection amount . 3. The hot water supply apparatus according to claim 2 , wherein the remaining hot water calorie calculating means detects the temperature of the hot water in the hot water storage tank through the temperature measuring means at a constant time interval in the night time zone. A hot water supply apparatus, wherein a heating amount is derived, and the heating device control means determines whether or not to operate the heating device every time the remaining hot water heat amount is derived. 4. The water heater according to claim 2 , wherein the predicted weather information is input through an operation panel signal-connected to the weather information receiving means.

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