JP3891954B2 - Hot water storage water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water storage type hot water supply apparatus having a hot water storage tank for storing hot water for hot water supply heated by a heating means, and particularly relates to control of a heating operation according to the amount of heat used by a user.
[0002]
[Prior art]
A conventional hot water storage type hot water supply apparatus has a heat pump cycle in which a refrigerant compressor, a refrigerant flow path of a water heat exchanger, an expansion valve, and an air heat exchanger are annularly connected, and a hot water storage tank for storing hot water for hot water supply, This hot water storage tank is connected to the fluid flow path of the water heat exchanger, and a hot water supply fluid circuit with a fluid pump installed in the middle of the connection, and the amount of hot water in the hot water storage tank and its fluid temperature are detected. A heat consumption calculating means for calculating the heat consumption and control means for controlling the expansion valve, the fluid pump, and the refrigerant compressor to perform a boiling operation are provided.
[0003]
The boiling operation is performed by the control means when it is detected that the amount of hot water stored in the hot water storage tank is lower than a first predetermined amount M1 (for example, 100 ° C of hot water at 60 ° C.) during the midnight hours when the power rate setting is the lowest. The fluid temperature at the inlet side of the fluid flow path becomes equal to or higher than the first set temperature K1 (for example, the boiling target temperature −10 ° C.) or the amount of hot water stored in the hot water storage tank is the first predetermined amount M1 + α ( In addition, when it reaches α ≧ 0, the boiling operation is stopped.
[0004]
In addition, in the morning and evening hours when the price setting is relatively low, when the state in which the amount of hot water in the hot water storage tank falls below a second predetermined amount M2 (for example, 200 ° C. hot water at 60 ° C.) is started, the controller starts boiling operation. Then, the fluid temperature on the inlet side of the fluid flow path becomes equal to or higher than the second set temperature K2 (for example, 65 ° C.), or the hot water storage amount in the hot water storage tank is the second predetermined amount M2 + β (β ≧ 0). When it reaches, boiling operation is stopped.
[0005]
Further, in the daytime period when the charge setting is high, when the state in which the amount of hot water in the hot water storage tank falls below a third predetermined amount M3 (for example, 60 ° C. hot water is 200 L), the controller starts boiling operation, The fluid temperature on the inlet side of the fluid flow path becomes a third set temperature K3 (for example, 50 ° C.) or higher, or the amount of hot water stored in the hot water storage tank reaches a third predetermined amount M3 + γ (where γ ≧ 0). Then, the boiling operation is stopped.
[0006]
As a result, in response to the pattern in which the user uses hot water for hot water supply in the hot water storage tank, the start determination condition for the boiling water operation and the end determination condition for the boiling operation are independent for each time period. Thus, control is performed so as to always ensure the minimum amount of hot water stored in the hot water storage tank so that hot water does not run out in all time zones (see, for example, Patent Document 1).
[0007]
[Patent Document 1]
JP 2002-206805 (pages 11-12, FIG. 17)
[0008]
[Problems to be solved by the invention]
However, according to Patent Document 1, the amount of hot water stored in the hot water storage tank is set to a relatively large third predetermined amount M3 (for example, 200 L of hot water at 60 ° C.) + Γ (γ ≧ 0) or more in the daytime period when the charge setting is high. The boiling operation is performed to ensure the minimum amount of stored hot water. According to this, there is a problem that the electricity bill becomes high although the hot water does not run out.
[0009]
In addition, in this type of hot water storage type hot water supply device, for example, a user who uses a small amount of hot water from morning to midnight (for example, from 7:00 to 23:00) and remains hot at 23:00. In this case, heat dissipation in the unused period after the evening is wasted. On the other hand, if the user consumes a lot of hot water in the day and uses up the hot water in the hot water storage tank by the evening, there is a problem that the hot water runs out in the evening or at night. Thus, the variation in the amount of heat used required for hot water supply by the user is large. Therefore, it is common to perform a boiling operation for this purpose to obtain a relatively large minimum amount of stored hot water.
[0010]
Therefore, an object of the present invention is to take the above-mentioned points into consideration, and without causing hot water shortage by controlling to perform boiling operation in the midnight time zone with the lowest power rate setting, and other than midnight time zone An object of the present invention is to provide a hot water storage type hot water supply apparatus that can reduce the heating operation in the time zone.
[0011]
[Means for Solving the Problems]
In order to achieve the above object , the technical means described in claim 1 and claim 2 are employed. That is, in the invention described in claim 1, a hot water storage tank (1) for storing hot water for hot water supply therein, a heating means (2) for boiling water in the hot water storage tank (1), and this heating means In a hot water storage type hot water supply apparatus comprising a control means (200) for controlling (2),
The control means (200) includes a use heat amount calculation means (290) for calculating the heat use amount of hot water used for hot water supply from the hot water storage tank (1) within a unit period and storing the heat use amount as data. The average usage heat amount calculation means (300) for calculating the average usage heat amount within a predetermined period from the data of the usage heat amount within the unit period accumulated by the usage heat amount calculation means (290) , and the usage heat amount calculation means (290). The variation heat amount calculation means (310) for calculating the variation heat amount within a predetermined period from the data of the heat use amount within the unit period, and the use heat amount and the average use heat amount calculation means (300) accumulated by the use heat amount calculation means (290) The boiling heat amount is calculated based on the average calorific value calculated by the calculation and the variation calorific value calculated by the variation calorie calculating means (310). Heating amount calculation means (330, 340) and second boiling means (350) for heating the heating means (2) based on the amount of heating heat calculated by the boiling heat amount calculation means (330, 340) A hot water storage hot water supply device having
The boiling heat quantity calculation means (330, 340) includes the latest use heat quantity accumulated by the use heat quantity calculation means (290) and the average use heat quantity calculated by the average use heat quantity calculation means (300) and the variation heat quantity calculation means (310). ), The added value of the average amount of heat used and the amount of variation heat is calculated as the amount of heat to be heated .
[0012]
According to the first aspect of the present invention, in this type of hot water supply apparatus, variation occurs in the amount of heat used by hot water used by the user for hot water supply. Therefore, in the present invention, the heating heat quantity calculating means (which calculates the heating heat quantity based on the average used heat quantity calculated by the average used heat quantity calculating means (300) and the variation heat quantity calculated by the varying heat quantity calculating means (310) ( 330, 340) and second heating means (350) for heating the heating means (2) based on the heating heat amount calculated by the boiling heat amount calculation means (330, 340). In addition to the average amount of heat used within a predetermined period, the amount of heat used within the predetermined period varies, and the amount of heat used for boiling is taken up, so that hot water can be supplied without running out of hot water, For example, if the fare setting is performed at the lowest midnight time, the fare can be raised at a time other than the midnight time when the fare setting is higher. It can be reduced.
[0014]
In addition , when the latest heat, that is, the amount of heat used the day before, is smaller than the sum of the average heat of use and the amount of variation, the amount of heat of boiling is the sum of the average amount of heat used and the amount of heat of variation. The amount of heat that can be accommodated within the range of use, and the amount of excess boiling heat is not raised. Therefore, it is possible to reduce the electric power for the boiling operation without causing hot water to run out.
[0015]
In the invention according to claim 2 , the boiling heat quantity calculating means (330, 340) is an average in which the latest used heat quantity accumulated by the used heat quantity calculating means (290) is calculated by the average used heat quantity calculating means (300). When the amount of heat used is larger than the added value of the heat of variation calculated by the heat of calorie calculation means (310), the latest heat of use is calculated as the amount of heat to be heated.
[0016]
According to the second aspect of the present invention, when the latest (previous day) use heat amount is larger than the sum of the boiling heat amount average use heat amount and the variation heat amount, the boiling heat amount becomes the latest use heat amount. Therefore, the amount of heat of boiling corresponds to outside the assumed use range, but by continuing the amount of heat used again, hot water does not run out, and heating operation can be performed according to the amount of heat used without waste. .
[0019]
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a hot water storage type hot water supply apparatus according to an embodiment to which the present invention is applied will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing an overall configuration of a hot water storage type hot water supply apparatus. In the hot water storage type hot water supply apparatus of the present embodiment, as shown in FIG. 1, reference numeral 1 is a metal (for example, stainless steel) hot water storage tank excellent in corrosion resistance, and a heat insulating material (not shown) is arranged on the outer periphery. Hot water for hot water supply can be kept warm for a long time. The hot water storage tank 1 has a vertically long shape, and an introduction port 11 is provided on the bottom surface. An introduction pipe 12 that is a water supply path for introducing tap water into the hot water storage tank 1 is connected to the introduction port 11.
[0021]
The introduction pipe 12 is provided with a water supply thermistor 21 as temperature detection means, and outputs temperature information in the introduction pipe 12 to the control device 200 described later. In addition, the introduction pipe 12 is provided with a pressure reducing check valve 51 that adjusts the water pressure of the introduced tap water to a predetermined pressure and prevents the backflow of hot water in the case of water interruption. And the feed water branch point 12a downstream from the position where the feed water thermistor 21 and the pressure reducing check valve 51 of the introduction pipe 12 are provided and the mixing valve 16 described later are connected by a feed water pipe 15 which is a bypass route.
[0022]
On the other hand, a lead-out port 13 is provided at the top of the hot water storage tank 1, and a lead-out pipe 14 is connected to the lead-out port 13, which is a hot water supply path for leading out hot water in the hot water storage tank 1. A discharge pipe 52 provided with a relief valve 53 is connected in the middle of the outlet pipe 14. When the pressure in the hot water storage tank 1 rises above a predetermined pressure, the hot water in the hot water storage tank 1 is connected. Is discharged outside to prevent damage to the hot water storage tank 1 and the like.
[0023]
Reference numeral 16 denotes a mixing valve, which is a mixing means, and is arranged at the junction of the outlet pipe 14 and the water supply pipe 15. The mixing valve 16 adjusts the opening area ratio (the ratio of the opening degree on the hot water side communicating with the outlet pipe 14 and the opening degree on the water side communicating with the feed water pipe 15) to thereby provide hot water and water supply from the outlet pipe 14. The mixing ratio with the tap water from the pipe 15 can be adjusted.
[0024]
The mixing valve 16 is an electric valve that adjusts the opening degree of each path by driving a valve body by a drive source such as a servo motor, and is operated by a control signal from a control device 200 to be described later and controls the operating state. The data is output to the apparatus 200.
[0025]
A pipe 17 that is a mixed hot water path is connected to the outlet side of the mixing valve 16. This pipe 17 is a pipe for introducing hot water mixed into a hot water tap, a shower tap, a bathtub and the like (not shown). The pipe 17 is provided with a hot water supply thermistor 71 which is a temperature detection means and a flow rate counter 72 which is a hot water detection means. The hot water thermistor 71 is temperature information in the pipe 17, and the flow rate counter 72 is a flow rate in the pipe 17. The information is output to the control device 200 described later.
[0026]
Note that when the flow counter 72 detects the flow of water in the pipe 17, hot water is about to be used in any of a hot water tap, a shower tap, a bathtub, and the like. At this time, the controller 200 first roughly adjusts the opening area ratio of the mixing valve 16 from the temperature information from the hot water supply thermistor 21 and the temperature information from the hot water thermistor 32 described later according to the hot water supply set temperature, and then the hot water supply thermistor 71. The opening area ratio of the mixing valve 16 is finely controlled so that the hot water supply temperature becomes the set temperature based on the temperature information from.
[0027]
A suction port 18 for sucking water in the hot water storage tank 1 is provided at the lower part of the hot water storage tank 1, and a discharge port 19 for discharging hot water into the hot water storage tank 1 is provided at the upper part of the hot water storage tank 1. It has been. The suction port 18 and the discharge port 19 are connected by a circulation circuit 20, and a part of the circulation circuit 20 is disposed in the heat pump unit 2.
[0028]
A portion of the circulation circuit 20 arranged in the heat pump unit 2 is provided with a heat exchanger for hot water supply (not shown), and the water in the hot water storage tank 1 sucked from the suction port 18 is exchanged with the high-temperature refrigerant. The water in the hot water storage tank 1 can be boiled by heating and returning it from the discharge port 19 into the hot water storage tank 1.
[0029]
In addition, the heat pump unit 2 which is a heating means of this embodiment is a supercritical heat pump composed of refrigerant functional parts constituting a heat pump cycle such as a compressor, a condenser (heat exchanger for hot water supply), a decompressor, and an evaporator (not shown). It is. This supercritical heat pump refers to a heat pump cycle in which the refrigerant pressure on the high-pressure side becomes equal to or higher than the critical pressure of the refrigerant. For example, the heat pump cycle uses carbon dioxide, ethylene, ethane, nitrogen oxide, or the like as a refrigerant.
[0030]
Incidentally, according to the supercritical heat pump, hot water can be boiled at a higher temperature (for example, about 85 ° C. to 90 ° C.) than a general heat pump cycle. The heat pump unit 2 is operated by a control signal from a control device 200 described later, and outputs an operation state to the control device 200.
[0031]
Next, a hot water thermistor 32 for detecting the water temperature in the upper part of the hot water storage tank 1 is provided on the upper outer wall surface of the hot water storage tank 1, and the temperature information of the water derived from the outlet 13 is transmitted to the control device 200 described later. It is designed to output.
[0032]
In addition, water level thermistors 33a to 33e, which are hot water storage heat amount detecting means for detecting the temperature of hot water at those positions, are disposed on the outer wall surface of the hot water storage tank 1 at positions 50L, 100L, 150L, 200L and 300L as measured from above. Has been. Incidentally, the water level thermistors 33a, 33b, 33c and 33d function as a hot water storage amount sensor, the water level thermistor 33e functions as a full tank sensor, and outputs temperature information at each water level to the control device 200 described later. It has become.
[0033]
Therefore, the control device 200 to be described later is based on the temperature information from the water level thermistors 33a to 33e, and the temperature boundary between the hot water heated in the upper part of the hot water tank 1 and the water before the hot water in the lower part of the hot water tank 1 is heated. The amount of stored hot water can be detected from the position. Incidentally, when the water level thermistors 33a, 33b, 33c are not less than a predetermined temperature (for example, 60 ° C.) and the water level thermistor 33d is not more than the predetermined temperature (for example, 60 ° C.), it can be detected that the amount of stored hot water is 150L. In addition, the above-mentioned predetermined temperature is a boiling temperature.
[0034]
In the present embodiment, the temperature information detected by the water level thermistor 33e detects the boiling temperature Tp when the boiling operation is performed, and is near the suction port 18 that is sucked into the heat pump unit 2. Is provided.
[0035]
Reference numeral 200 denotes a control device which is a control means, which is not shown, provided on the operation panel 100 which is temperature information from the thermistors 21, 32, 33a to 33e, 71, flow information from the flow counter 72, and operation means. The heat pump unit 2 and the mixing valve 16 are controlled based on operation signals from various operation switches and the like.
[0036]
Next, the operation of the hot water storage type hot water supply apparatus having the above configuration will be described with reference to FIG. FIG. 2 is a flowchart showing a control process of the boiling operation of the control device 200. In the heating operation of the present embodiment, when the day-end time (for example, 23:00) is reached, for example, within a unit period (for example, one day) from 23:00 on the previous day to 23:00 on the current day. Calculates the amount of heat used for hot water used for hot water supply, accumulates the amount of heat used as data, and uses the amount of heat used, average amount of heat used, and variation within a specified period (for example, 7 days) from the accumulated amount of heat used. Based on the amount of heat, the amount of heat to be heated on the day is calculated, and the hot water for the hot water supply corresponding to the amount of heat to be heated is used in the midnight time zone (for example, 23:00) when the power rate setting is the lowest after the above-mentioned separation time. Until 7:00).
[0037]
In a time zone other than the midnight time zone, the amount of hot water stored in the hot water storage tank 1 is read, and the heating pump unit 2 is heated when the amount of stored hot water falls below the variation amount. As will be described in detail later, this variation amount is a state in which the hot water in the hot water storage tank 1 runs out before the delimiter time is reached, that is, the minimum hot water storage amount for preventing the hot water from running out. Generally, a predetermined value (for example, about 150 to 200 L) is set to prevent hot water from running out during hot water supply.
[0038]
Next, the control process of the boiling operation which is the main part of the present invention will be described. First, a heating operation switch (not shown) is operated among various operation switches (not shown). Thereby, as shown in FIG. 2, the control apparatus 200 starts the control process of a boiling operation (step 210).
[0039]
Then, the boiling operation that is the first boiling means in step 220 is performed. In this first boiling means, in step 230, based on the temperature information from the water level thermistors 33a to 33e, a predetermined temperature or higher is reached. The current hot water storage amount is detected from the water level thermistors 33a to 33e (for example, 60 ° C.).
[0040]
Next, in step 240, it is determined whether or not the current hot water storage amount is equal to or less than the variation amount. Here, when the current hot water storage amount is below the variation amount, in step 250, the heat pump unit 2 is controlled to perform a boiling operation. Then, in the next step 260, it is determined whether or not the current hot water storage amount is not less than the variation amount + α (for example, about 50 L). If the current hot water storage amount is equal to or greater than the variation amount + α, in step 270, the heat pump unit 2 is controlled to stop the boiling operation.
[0041]
It should be noted that the amount of variation in step 240 and step 260 described above is the past predetermined period (for example, 7 days) obtained one day before the day break time in step 280 (for example, 23:00) is reached. It is obtained by conversion from the variation heat quantity σ corresponding to the first and second boiling heat quantities obtained from the heat use quantity, average use heat quantity and variation heat quantity for each unit period (for example, one day). In step 240, when the current hot water storage amount exceeds the variation amount, the boiling operation is not performed.
[0042]
Next, when the delimiter time (for example, 23:00) is reached, it is determined in step 280 whether or not the current time has reached 23:00. If YES, in step 290, which is a used heat amount calculation means, The amount of heat of hot water used for hot water supply from the hot water storage tank 1 is calculated on that day (for example, from 23:00 on the previous day to 23:00 on the same day), and the amount of heat used per day is stored in a ROM (not shown) of the control device 200. Remember. Note that the stored amount of heat used per day is stored so that it accumulates for a predetermined period in the past (for example, 7 days).
[0043]
An example of the calculation will be described below. First, a value obtained by integrating the amount of heat used for each liter used for one day of the day (for example, from 23:00 on the previous day to 23:00 on the same day) is used. A formula for obtaining the heat quantity of 1 liter is shown in Formula 1.
[0044]
[Formula 1]
Qs1L = (Thw−THWA) × specific gravity / heat dissipation loss coefficient However, Qs1L: calorie of 1 liter, Thw: hot water supply temperature, THWA: average water supply temperature, heat dissipation loss coefficient: 0.9.
[0045]
Here, the average water supply temperature THWA is an average of the water supply temperature Ttwi supplied to the hot water storage tank 1 between 23:00 on the previous day and 23:00 on the same day, and is set as a reference water temperature. Specifically, the hot water supply flow rate is detected by the flow rate counter 72, the water supply temperature is integrated at regular intervals, and the average value is obtained after 23:00. Further, the specific gravity is a constant for conversion from temperature to heat, is obtained from Equation 2, and the heat dissipation loss coefficient is 0.9.
[0046]
[Formula 2]
Specific gravity = (− 2 × 10 ⁻⁶ × Thw ² −2.7 × 10 ⁻⁴ × Thw + 1.0058)
However, Thw: Hot water supply temperature. Every time the flow rate counter 72 detects a flow rate of 1 liter, the integrated heat quantity is calculated by applying the above equation 1. That is Equation 3.
[0047]
[Formula 3]
Qday = ΣQs1L
However, Qday: the amount of heat used per day, the integrated value of the amount of heat used per liter (from 23:00 on the previous day to 23:00 on the same day), and the amount of heat used each day up to the past one week before, the Qday, Qdayn-1, Qdayn-2, ..., Qdayn-5, Qdayn-6.
[0048]
Then, in step 300, which is the next average heat amount calculating means, the average heat amount is calculated from Equation 4 based on the accumulated heat amounts for the past seven days.
[0049]
[Formula 4]
Average heat of use Qav = (Qdayn + Qdayn-1 + Qdayn-2 + Qdayn-3 + Qdayn-4 + Qdayn-5 + Qdayn-6) / 7
In the present embodiment, the predetermined period of the accumulated data on the amount of heat used is the past seven days. However, the present invention is not limited to this. For example, the accumulated data may be accumulated in the past month, seasonal period, or the like.
[0050]
Next, in step 310 which is a variation heat amount calculation means, a variation heat amount σ is calculated. In the present embodiment, the difference (deviation) between the average amount of heat used calculated in step 300 and the amount of heat used accumulated for the past seven days is squared, and is obtained from the square root of the value obtained by arithmetically averaging it. This is a standard deviation.
[0051]
Then, in step 320 which is a heating heat amount determination means, the latest used heat amount among the accumulated heat amounts for the past seven days, that is, the used heat amount on the previous day calculated in step 290 is the average used heat amount and the variation heat amount σ. It is determined whether it is larger than the addition value. Here, when the amount of heat used on the previous day is large, in step 330 which is a boiling heat amount calculation means, a first boiling heat amount which is an assumed amount of heat used on that day is obtained. At this time, it is determined that the amount of hot water used on the day that is assumed to be larger than the added value of the average heat of use and the variation of heat σ is outside the use range, and the heat of use on the previous day is directly used as the first boiling heat. To do.
[0052]
On the other hand, when the amount of heat used on the previous day is small, the second amount of heating heat that is the amount of heat used on the current day is obtained in step 340, which is a heating heat amount calculation means. At this time, it is determined that the amount of hot water used on the day that is assumed to be smaller than the sum of the average amount of heat used and the amount of variation heat σ is within the use range, and the sum of the average amount of heat used and the amount of heat of variation σ is calculated. It is set as the 2nd boiling heat amount.
[0053]
It should be noted that the added value of the amount of heat used on the previous day, which is the first amount of heating, and the average amount of heat used, which is the second amount of heating, and the variation amount of heat σ are converted from the respective amounts of heat into the amount of boiling based on Equation 5.
[0054]
[Formula 5]
Boiling amount L ₁ = Qdayn / ((Tavg−THWA) × specific gravity × 4.18)
Boiling amount L ₂ = (Qav + σ) / ((Tavg−THWA) × specific gravity × 4.18)
However, Tavg: average temperature in the tank, and in step 350 which is the second boiling means, the boiling amount which is the starting condition determined in step 320 is heated up to the boiling target temperature Tpo. It is. Specifically, in step 360, the second boiling means outputs to the heat pump unit 2 to operate the boiling operation, and in step 370, the boiling temperature Tp detected by the water level thermistor 33e is output. The heat pump unit 2 is operated until the boiling target temperature Tpo is reached. When the boiling temperature Tp exceeds the boiling target temperature Tpo in step 370, the heating pump unit 2 is heated in step 380. Controlled to stop. Thereby, in the midnight time zone (for example, from 23:00 to 7:00), the boiling amount corresponding to the use heat amount of hot water for hot water used on the next day (from 23:00 on the next day to 23:00 on the next day) is heated. be able to.
[0055]
In this embodiment, the amount of variation in step 240 and step 260 is the amount of heat used and the amount of average heat used per unit period (for example, one day) within the past predetermined period (for example, seven days) obtained one day ago. And calculated from the variation calorie σ, which is the standard deviation according to the first and second boiling calorific values obtained from the variation calorific value, but not limited to this, the average used calorie and the accumulated past 7 days It may be obtained by an arithmetic average from the difference between each of the used heat amounts, that is, the difference between the average used hot water amount converted from the average used heat amount and each used hot water amount converted from each used heat amount for the past seven days.
[0056]
According to the hot water storage type hot water supply apparatus of one embodiment described above, in this type of hot water supply type hot water supply apparatus, in this type of hot water supply apparatus, variations occur in the amount of heat used by the user for hot water supply. .
[0057]
Therefore, in the present invention, the heating heat amount for calculating the heating heat amount based on the average used heat amount calculated by the average used heat amount calculation means (step 300) and the variation heat amount σ calculated by the variation heat amount calculation means (step 310). A calculation means (steps 330 and 340), and a second boiling means (step 350) for performing a heating operation of the heat pump unit 2 based on the heating heat amount calculated by the boiling heat amount calculation means (steps 330 and 340). In addition to the average amount of heat used within a predetermined period (for example, 7 days), the amount of heat used within the predetermined period is heated up in consideration of the amount of heat used for heating σ. Hot water supply without the need for heating, for example, in the midnight hours when the price setting is the lowest By doing so, it is possible to reduce the heating operation in a time zone other than the midnight time zone when the charge setting is high.
[0058]
In addition, when the accumulated amount of used heat (the previous day) is smaller than the added value of the average used heat amount and the variation heat amount σ, the boiling heat amount becomes the added value of the average use heat amount and the variation heat amount. The amount of heat to be raised becomes the amount of heat that falls within the assumed use range, and the excess amount of heat to be heated is not boiled. Therefore, it is possible to reduce the electric power for the boiling operation without causing hot water to run out.
[0059]
In addition, when the latest (previous day) accumulated heat consumption is greater than the sum of the average heat consumption and the variation calorific value, the boiling heat amount is the latest (previous day) heat consumption, so the boiling heat amount is assumed. Although it corresponds to outside the range of use, it is possible to perform boiling operation without waste according to the amount of heat used, without causing the hot water to run out by continuing the amount of heat used again.
[0060]
Further, the variation heat quantity σ can be obtained as a highly accurate variation heat quantity by calculating the variation between the use heat quantity and the average use heat quantity within a predetermined period by the standard deviation. In addition, the second boiling means (step 350) performs boiling in the midnight time zone where the rate setting is the lowest by performing boiling in the midnight time zone where the rate setting is the lowest among a plurality of time zones where the rate settings are different. By raising the temperature, it is possible to reduce the heating operation in a time zone other than the midnight time zone when the charge setting is high.
[0061]
(Other embodiments)
In the above embodiment, in step 340 which is the boiling heat amount calculation means, the amount of hot water used on the day that is the second boiling heat amount is set as an addition value of the average heat amount and the variation heat amount σ. σ may be changed to 2σ and 3σ.
[0062]
In the above embodiment, the present invention is applied to the heat pump unit 2 composed of a supercritical heat pump composed of refrigerant functional parts constituting a heat pump cycle such as a compressor, a condenser, a decompressor, and an evaporator. Instead, it may be applied to heating means constituting a general heat pump cycle. Furthermore, an electric heater may be provided in the hot water storage tank 1 and applied to an electric water heater that stores hot water using late-night power.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of a hot water storage type hot water supply apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a control process of a boiling operation of the control device 200 according to an embodiment of the present invention.
[Explanation of symbols]
1 ... Hot water storage tank 2 ... Heat pump unit (heating means)
200: Control device (control means)
290 ... calorific value calculating means 300 ... average calorific value calculating means 310 ... variation calorific value calculating means 330 ... boiling heat amount calculating means 340 ... boiling heat amount calculating means 350 ... second boiling means

Claims (2)

A hot water storage tank (1) for storing hot water for hot water supply inside,
Heating means (2) for boiling water of the hot water storage tank (1);
In a hot water storage type hot water supply apparatus comprising a control means (200) for controlling the heating means (2),
The control means (200) includes a use heat amount calculation means (290) for calculating a heat use amount of hot water used for hot water supply from the hot water storage tank (1) within a unit period and storing the heat use amount as data. ,
An average used heat amount calculating means (300) for calculating an average used heat amount within a predetermined period from the used heat amount data within the unit period accumulated by the used heat amount calculating means (290) ;
A variation heat amount calculation means (310) for calculating a variation heat amount within a predetermined period from the data of the use heat amount within the unit period accumulated by the use heat amount calculation means (290) ;
Boiling based on the used heat amount accumulated by the used heat amount calculation means (290), the average used heat amount calculated by the average used heat amount calculation means (300), and the variation heat amount calculated by the variation heat amount calculation means (310). Boiling heat amount calculating means (330, 340) for calculating the amount of heat to be raised;
A hot water storage type hot water supply apparatus having second boiling means (350) for heating the heating means (2) based on the amount of boiling heat calculated by the boiling heat quantity calculating means (330, 340). ,
The boiling heat quantity calculation means (330, 340) includes the latest use heat quantity accumulated by the use heat quantity calculation means (290) and the average use heat quantity calculated by the average use heat quantity calculation means (300) and the variation heat quantity. A hot water storage type hot water supply apparatus, characterized in that, when it is smaller than the added value of the variation heat quantity calculated by the calculation means (310), the addition value of the average use heat quantity and the variation heat quantity is calculated as a boiling heat quantity . The boiling heat quantity calculation means (330, 340) includes the latest use heat quantity accumulated by the use heat quantity calculation means (290) and the average use heat quantity calculated by the average use heat quantity calculation means (300) and the variation heat quantity. The hot water storage type hot water supply apparatus according to claim 1, wherein the latest used heat quantity is calculated as the boiling heat quantity when the value is larger than the added value with the variation heat quantity calculated by the calculating means (310).

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