JP2004233003A - Hot water storage system - Google Patents

Abstract

To provide a hot water supply type hot water supply device capable of securing a hot water storage amount corresponding to a used hot water amount without expanding the hot water operation by expanding a selection range of a boiling operation.
An operation panel includes an operation mode selection switch for selecting one of an operation mode for boiling a heat pump unit according to a selection of a plurality of hot water storage amounts, and an operation mode selection switch. And a hot water supply temperature setting switch 120a, 120b for selecting one of the upper limit of the hot water storage amount, the lower limit of the hot water reserve, and the standard with respect to the reference value of the hot water storage amount selected by the standard. This makes it possible to secure a hot water storage amount according to the amount of hot water used without running out of hot water.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD 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 heating by heating a heating means by a boiling operation, and in particular, a boiling operation without running out of hot water according to the amount of hot water used by a user. The selection of the operation mode to perform.
[0002]
[Prior art]
The conventional hot water storage type hot water supply device has a refrigerant compressor, a refrigerant flow path of a water heat exchanger, an expansion valve, a heat pump cycle in which an air heat exchanger is connected in a ring, and a hot water storage tank for storing hot water for hot water supply. The hot water storage tank is connected to the fluid flow path of the water heat exchanger, and a hot water supply fluid circuit provided with a fluid pump in the middle of the connection, and a hot water supply fluid amount in the hot water storage tank and the fluid temperature are detected. A hot water consumption calculating means for calculating the hot water consumption, and a control means for controlling the expansion valve, the fluid pump, and the refrigerant compressor to perform the boiling operation are provided.
[0003]
Then, during the late night hours when the fee setting is the lowest, the user uses hot water for hot water supply in the hot water storage tank, and the amount of hot water stored in the hot water storage tank reaches the first predetermined amount M1 (for example, 100 L of 60 ° C. hot water). When detecting the state of falling below, the control means starts the boiling operation, and the temperature of the fluid on the inlet side of the fluid flow path becomes equal to or higher than the first set temperature K1 or the amount of hot water stored in the hot water storage tank becomes the first predetermined amount M1 + α ( When α ≧ 0), the boiling operation is stopped.
[0004]
In the morning and evening hours when the charge setting is relatively low, the user uses hot water for hot water supply in the hot water storage tank, and the amount of hot water stored in the hot water storage tank is the second predetermined amount M2 (for example, 200 L of hot water at 60 ° C.). When the state is detected below the temperature, the control means starts the boiling operation, and the fluid temperature at the inlet side of the fluid flow path becomes equal to or higher than the second set temperature K2 or the amount of hot water stored in the hot water storage tank becomes the second predetermined amount M2 + β ( , Β ≧ 0), the boiling operation is stopped.
[0005]
Furthermore, in the daytime period when the charge is high, the user uses hot water for hot water supply in the hot water storage tank, and the amount of hot water stored in the hot water storage tank falls below a third predetermined amount M3 (for example, 200 L for 60 ° C. hot water). When the state is detected, the control means starts the boiling operation, and the temperature of the fluid on the inlet side of the fluid flow path becomes equal to or higher than the third set temperature K3, or the amount of hot water stored in the hot water storage tank becomes a third predetermined amount M3 + γ (γ ≧ 0), the boiling operation is stopped.
[0006]
Accordingly, in accordance with the pattern in which the user uses hot water for hot water supply in the hot water storage tank, the start determination condition of the hot water heating operation and the determination condition of the end of the hot water operation are independently set for each time zone. Then, control is performed such that the minimum amount of hot water stored in the hot water storage tank is always ensured to prevent running out of hot water in all time zones (for example, see Patent Document 1).
[0007]
[Patent Document 1]
JP-A-2002-206805 (pages 11 to 12, FIG. 17)
[0008]
[Problems to be solved by the invention]
However, according to Patent Literature 1, the amount of hot water stored in the hot water storage tank during the daytime period when the charge setting is high is set to a relatively large third predetermined amount M3 (for example, 200 L for 60 ° C. hot water) + γ (γ ≧ 0) or more In order to ensure the minimum amount of hot water stored, a boiling operation is performed. According to this, there is no problem of running out of hot water, but there is a problem that the electricity bill becomes high.
[0009]
In addition, in this type of hot water storage type hot water supply device, for example, a user uses a small amount of hot water from morning to late night (for example, from 7:00 to 23:00), and leaves a large amount of hot water at 23:00. In this case, the heat radiation in the unused period after the evening is wasted. Conversely, a user who uses a large amount of hot water a day and uses up the hot water in the hot water storage tank by the evening has a problem that the hot water runs out in the evening or at night. As described above, the amount of hot water used varies widely depending on the user. Therefore, for this purpose, a boiling operation for obtaining a relatively large hot water storage amount is generally performed.
[0010]
In view of the above, an object of the present invention is to expand the selection range of the boiling operation, so that hot water can be secured without running out of hot water and in accordance with the amount of hot water used. Another object of the present invention is to provide a hot water storage type hot water supply device.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the technical means described in claims 1 to 7 is adopted. That is, according to the first aspect of the present invention, a hot water storage tank (1) for storing hot water for hot water supply therein, and a heating means for boiling water in the hot water storage tank (1) to a hot water storage amount according to the amount of hot water used. (2) operating means (100) for selecting and operating an operation mode for boiling the heating means (2); and heating means (2) based on an operation signal output from the operating means (100). ), And a control means (200) for controlling hot water supply.
The operation means (100) includes a first operation mode selection means (110) for selecting one of the operation modes for boiling the heating means (2) in accordance with a plurality of hot water storage amount selection categories, and a first operation mode selection means (110). The second operation mode selection means (120a, 120a) selects the hot water storage amount selected by the one operation mode selection means (110) as a reference value, and selects any one of an upper limit, a lower limit, and a reference value for the reference value. 120b).
[0012]
According to the first aspect of the present invention, in this type of hot water supply device, the amount of hot water used varies depending on the user. Therefore, in the present invention, the selection range of the boiling operation is expanded, and the first operation mode selection operation means (110) for selecting any one according to the selection of the plurality of hot water storages is further selected. The second operation mode selection operation means (120a, 120b) for selecting any one of an upper limit, a lower limit, and a reference value with respect to the reference value using the stored hot water amount as a reference value, By the selection section, a boiling operation mode can be selected according to the amount of hot water used by the user. This makes it possible to secure a hot water storage amount according to the amount of hot water to be used from among a plurality of selection sections, as compared with the related art in which the boiling operation mode is fixed so as to have a large hot water storage amount. Therefore, there is no drainage, no wasteful heat radiation, and the electricity cost is reduced.
[0013]
In the invention described in claim 2, the control means (200) is provided with a used hot water amount calculating means for calculating the used hot water amount from the hot water supply amount supplied from the hot water storage tank (1) within a predetermined period and accumulating data. The second operation mode selection means (120a, 120b) is characterized in that the reference value of the hot water storage amount is automatically selected from the accumulated data calculated and accumulated by the hot water consumption calculation means.
[0014]
According to the second aspect of the present invention, the amount of hot water stored is such that only the required amount is heated based on the accumulated data of the amount of hot water used in the past. Hot water storage can be secured.
[0015]
According to the third aspect of the present invention, the control means (200) calculates the used hot water amount from the hot water supply amount supplied from the hot water storage tank (1) within a predetermined period, and accumulates data. A target hot water amount obtained by adding the hot water amount obtained from the stored data calculated and stored by the hot water amount calculating means, and a boiling temperature for obtaining a boiling temperature from the target hot water amount. The second operation mode selecting means (120a, 120b) determines the reference value of the hot water storage amount and the upper and lower limits of the reference value based on the standard boiling temperature calculated by the standard boiling temperature calculating means. It is characterized by being selected.
[0016]
According to the third aspect of the present invention, in the above-mentioned second aspect, the selection range of the boiling operation is a selection section of a plurality of hot water storage amounts where the boiling temperature is constant. If the boiling temperature is lower, the amount of hot water can be reduced. Conversely, if the boiling temperature is lower, the amount of hot water can be increased.
[0017]
In the invention described in claim 4, the predetermined period is the past week, and the second operation mode selecting means (120a, 120b) sets the reference value of the hot water storage amount to the maximum used hot water amount among the accumulated data of the past one week. It is characterized by having.
[0018]
According to the invention described in claim 4, the amount of hot water used varies depending on environmental changes such as seasons. Therefore, in the present invention, since the maximum amount of hot water is used in the accumulated data of the past week, the amount of hot water stored according to the amount of hot water used can be secured. As a result, the hot water does not run out.
[0019]
In the invention described in claim 5, the second operation mode selection means (120a, 120b) selects the upper limit and the lower limit of the reference value of the hot water storage amount from a predetermined hot water storage amount including at least 0 set in advance. And
[0020]
According to the fifth aspect of the present invention, in the above-mentioned second aspect, the hot water storage amount for boiling only the necessary amount is automatically selected based on the accumulated data of the used hot water amount in the past. The present invention is not limited to this, and may be selected from a predetermined hot water storage amount set in advance. According to this, although the accuracy is slightly inferior to that of the second aspect, it is possible to secure the hot water storage amount according to the used hot water amount.
[0021]
In the invention described in claim 6, the first operation mode selecting means (110) is a full tank mode in which the selection section of the hot water storage capacity is at least a large capacity hot water storage capacity, and the hot water storage capacity according to the past hot water usage results. , And one of a saving mode in which the amount of hot water to be used is minimized.
[0022]
According to the invention described in claim 6, at least one of the full tank mode, the automatic mode, and the saving mode can be selected according to the amount of hot water used. This allows selection according to the amount of hot water used.
According to the invention described in claim 7, the operating means (100) is for selecting any one of the operating modes from the first operating mode selecting means (110) and the second operating mode selecting means (120a, 120b). A display is provided, and the second operation mode selection means (120a, 120b) is characterized in that the display of a plurality of operation modes is identified according to the selection.
[0023]
According to the invention described in claim 7, a plurality of operation mode displays are provided, and the display is identified according to the selection, so that the user can easily select and operate.
[0024]
Note that the reference numerals in parentheses of the above means indicate the correspondence with specific means of the embodiment described later.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Hereinafter, a hot water supply type hot water supply apparatus according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing an overall configuration of a hot water supply type hot water supply apparatus. As shown in FIG. 1, the hot water supply type hot water supply apparatus of the present embodiment is a metal (for example, stainless steel) hot water storage tank 1 having excellent corrosion resistance, and a heat insulating material (not shown) is disposed on an outer peripheral portion thereof. The 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 inlet 11 is provided on the bottom surface thereof. The inlet 11 is connected to an inlet pipe 12 which is a water supply path for introducing tap water into the hot water storage tank 1.
[0026]
The inlet pipe 12 is provided with a water supply thermistor 21 as a temperature detecting means, and outputs temperature information in the inlet pipe 12 to a control device 200 described later. In addition, the introduction pipe 12 is provided with a pressure-reducing check valve 51 for adjusting the pressure of the introduced tap water to a predetermined pressure and for preventing the backflow of hot water when the water supply is cut off. Then, a water supply branch point 12a downstream of the position where the water supply thermistor 21 and the pressure-reducing check valve 51 of the introduction pipe 12 are provided and a mixing valve 16 described later are connected by a water supply pipe 15 which is a bypass path.
[0027]
On the other hand, an outlet 13 is provided at the top of the hot water storage tank 1, and the outlet 13 is connected to an outlet pipe 14 which is a hot water supply path for discharging hot water in the hot water storage tank 1. A discharge pipe provided with a relief valve (not shown) is connected in the middle of the outlet pipe 14, and when the pressure in the hot water storage tank 1 rises to a predetermined pressure or more, the hot water in the hot water storage tank 1 is discharged. Is discharged to the outside so as not to damage the hot water storage tank 1 and the like.
[0028]
Reference numeral 16 denotes a mixing valve, which is a mixing means, and is disposed at a junction of the outlet pipe 14 and the water supply pipe 15. The mixing valve 16 adjusts the opening area ratio (the ratio between the opening degree of the hot water side communicating with the outlet pipe 14 and the opening degree of the water side communicating with the water supply pipe 15), so that the hot water from the outlet pipe 14 and the water supply are adjusted. The mixing ratio with the tap water from the pipe 15 can be adjusted.
[0029]
The mixing valve 16 is an electric valve that drives a valve body by a drive source such as a servomotor to adjust the degree of opening of each path. The mixing valve 16 is operated by a control signal from a control device 200 described later, and controls the operation state. The data is output to the device 200.
[0030]
A pipe 17 which is a mixed hot water path is connected to an outlet side of the mixing valve 16. The pipe 17 is a pipe for guiding hot water mixed into a hot water faucet, a shower faucet, a bathtub, and the like (not shown). The pipe 17 is provided with a hot water supply thermistor 71 serving as a temperature detecting means and a flow rate counter 72 serving as a hot water supply detecting means. The hot water supply thermistor 71 provides temperature information in the pipe 17 and the flow counter 72 provides a flow rate in the pipe 17. The information is output to the control device 200 described later.
[0031]
When the flow counter 72 detects the flow of water in the pipe 17, it means that hot water is going to be used in any of a hot water faucet, a shower faucet, a bathtub, and the like. At this time, the control device 200 roughly adjusts the opening area ratio of the mixing valve 16 from the temperature information from the water supply thermistor 21 and the temperature information from the tap water thermistor 32, which will be described later, according to the hot water supply set temperature. The opening area ratio of the mixing valve 16 is finely controlled so that the hot water supply temperature becomes the set temperature on the basis of the temperature information received from the controller.
[0032]
In addition, a suction port 18 for sucking water in the hot water storage tank 1 is provided at a lower portion 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 an upper portion of the hot water storage tank 1. Have 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.
[0033]
A heat exchanger (not shown) is provided in a portion of the circulation circuit 20 disposed in the heat pump unit 2, and heats the water in the hot water storage tank 1 sucked from the suction port 18 by heat exchange with the high-temperature refrigerant. By returning the water from the discharge port 19 into the hot water storage tank 1, the water in the hot water storage tank 1 can be boiled.
[0034]
The heat pump unit 2, which is a heating unit of the present embodiment, is a supercritical heat pump including a refrigerant functional component included in a heat pump cycle such as a compressor, a condenser, a decompressor, and an evaporator (not shown). This supercritical heat pump refers to a heat pump cycle in which the refrigerant pressure on the high pressure side is equal to or higher than the critical pressure of the refrigerant, and is, for example, a heat pump cycle using carbon dioxide, ethylene, ethane, nitrogen oxide, or the like as a refrigerant.
[0035]
Incidentally, according to the supercritical heat pump, hot water can be heated 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 the control device 200 described later, and outputs an operation state to the control device 200.
[0036]
Next, on the upper outer wall surface of the hot water storage tank 1, a tapping thermistor 32 for detecting the temperature of the water in the upper portion of the hot water storage tank 1 is provided. Output.
[0037]
Water level thermistors 33a to 33e for detecting the temperature of the hot water at the positions 50L, 100L, 150L, 200L and 300L are measured on the outer wall surface of the hot water storage tank 1 from above. Incidentally, the water level thermistors 33a, 33b, 33c, and 33d function as hot water storage sensors, and the water level thermistor 33e functions as a full tank sensor, and outputs temperature information at each water level to a control device 200 described later. Has become.
[0038]
Therefore, the control device 200 described below, based on the temperature information from the water level thermistors 33a to 33e, determines the temperature boundary between the hot water in the upper part of the hot water storage tank 1 and the water in the lower part of the hot water storage tank 1 before being heated. The hot water storage amount can be detected from the position. Incidentally, when the water level thermistors 33a, 33b, 33c are at or above a predetermined temperature (for example, 60 ° C.) and the water level thermistor 33d is at or below a predetermined temperature (for example, 60 ° C.), it can be detected that the hot water storage amount is 150L. The above-mentioned predetermined temperature is a boiling temperature.
[0039]
Reference numeral 200 denotes a control device as control means, which will be described later 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, the mixing valve 16, and the like are controlled based on operation signals from various operation switches 110, 120a, 120b, 140, 150, and the like.
[0040]
Here, the operation panel 100, which is a main part of the present invention, will be described with reference to FIGS. As shown in FIG. 2A, the operation panel 100 selects and operates an operation mode for boiling the heat pump unit 2, and performs a first operation for selecting any one of various operation modes. An operation mode selection switch 110 serving as mode selection means, hot water supply temperature setting switches 120a and 120b for setting hot water supply temperature, a forced boiling operation switch 140 for forcibly operating the boiling operation, a pause switch 150 for stopping the heating operation, and the like. , And a display unit 130.
[0041]
First, the operation mode selection switch 110 is used to select from a selection section consisting of the magnitude of the amount of hot water to be stored in the hot water storage tank 1 and, by the way, a full tank mode in which a large volume of hot water (for example, 200 L or more) is desired. Only in the late-night mode, which is an automatic mode in which a hot water storage amount (for example, about 0 to 150 L) is desired in accordance with the past hot water usage and a saving mode in which a hot water storage amount (for example, about 50 L) is desired to be minimized. A selection switch for selecting one of the modes.
[0042]
Here, the full tank mode is an operation mode in which a large-capacity hot water storage amount is desired to be ensured so as not to run out of hot water at all times. Therefore, when the minimum hot water storage amount becomes equal to or less than the predetermined value, the heating operation is controlled regardless of the time zone. The Random mode is an operation mode that learns from the past usage results to keep the hot water storage in the daytime at the optimum hot water storage, and optimizes the boiling operation in the daytime hours when the price setting is high. Is controlled. The midnight only mode is a mode for users who use only a small amount of hot water and is a boiling operation mode only when the charge setting is the lowest nighttime period.
[0043]
Next, in addition to setting the hot water supply temperature, the hot water supply set temperature switches 120a and 120b set the hot water storage amount selected by the operation mode selection switch 110 as a reference value, and select one of an upper limit, a lower limit, and a reference value for the reference value. It also has a function of a selection switch that is a second operation mode selection means for selecting one of them. In this embodiment, the upper limit of the reference value can be selected by operating the high switch 120a side of the hot water supply set temperature switch, and the upper limit of the reference value can be selected by operating the low switch 120b side. Has become. Here, the reference value is referred to as “standard”, the upper limit of the reference value is referred to as “hot water”, and the lower limit of the reference value is referred to as “hot water”.
[0044]
FIG. 2B is a front view showing a normal display mode of the display unit 130. When the operation mode is set, the operation mode selection switch 110 is operated to select the automatic mode. As shown in FIG. 2C, the Omakase and Standard displayed positively in the figure are selected. At this time, by operating the operation mode selection switch 110 again, the Omakase and the standard mode are set and operated.
[0045]
When the す る と high switch 120a side is operated in the display shown in FIG. 2 (c), as shown in FIG. 2 (d), the positive display mode and the hot water mode shown in the figure are selected. By operating the operation mode selection switch 110 again, the automatic mode is set and operated. Similarly, at the time of the display shown in FIG. 2C, when the other low switch 120b is operated, the negative hot water mode is positively displayed, and the automatic mode and hot water mode are selected. ing.
[0046]
In addition, as shown in FIG. 3, in the midnight only mode, a selection is made from among a large amount of hot water, a standard, and a low-priced water amount in the same manner as in the above-mentioned automatic mode. is there. Thereby, any one of the seven operation modes of the boiling operation can be selected.
[0047]
In each of the operation modes, a minimum hot water storage amount is set, and a predetermined minimum hot water storage value shown in FIG. However, in the standard, the minimum hot water storage value is set by automatically learning the minimum hot water storage value and the actual hot water storage amount from past results. Incidentally, when the minimum hot water storage amount is larger than the actual hot water storage amount, a value obtained by adding the predetermined amount A to the minimum hot water storage amount is set as the minimum hot water storage amount. When the minimum hot water storage amount is smaller than the actual hot water storage amount, the minimum hot water storage amount is the predetermined amount A. The value obtained by subtracting the above value is used as the minimum hot water storage amount. However, at this time, 0 <minimum hot water storage amount <150.
[0048]
Next, the operation of the hot water supply type hot water supply apparatus having the above configuration will be described with reference to FIG. FIG. 4 is a flowchart showing a control process of the boiling operation of the control device 200. First, one of the operation modes shown in FIG. 3 is selected by the operation mode selection switch 110, the high switch 120a, and the low switch 120b, and the operation mode selection switch 110 is operated again. Thereby, as shown in FIG. 4, control device 200 starts the control process of the boiling operation (step 210). Then, in step 220, based on the temperature information from the water level thermistors 33a to 33e, the current hot water storage amount is detected from the water level thermistors 33a to 33e at a predetermined temperature or higher (for example, 60 ° C.).
[0049]
Next, in step 230, it is determined whether or not the current hot water storage amount is equal to or more than the set minimum hot water storage amount. Here, when the current hot water storage amount is lower than the minimum hot water storage amount, in step 240, control is performed so that the heat pump unit 2 is heated up. Then, in the next step 250, it is determined whether or not the current hot water storage amount is equal to or more than the minimum hot water storage amount + α (for example, about 50 L). If the current hot water storage amount is equal to or more than the minimum hot water storage amount + α, in step 260, the heat pump unit 2 is controlled so as to stop the boiling operation.
[0050]
Here, the minimum amount of hot water, which is a start condition and an end condition of the boiling operation, is automatically changed and set based on a past actual value in the standard of the only-only mode and the late-night only mode. By the way, the past actual value is automatically selected by the used hot water amount calculating means which calculates and accumulates the used hot water amount from the hot water supply amount supplied from the hot water storage tank 1 within a predetermined period (for example, for one week). is there.
[0051]
The hot water consumption calculating means is provided in a ROM (not shown) of the control device 200, and calculates the hot water consumption per day for a predetermined period (for example, for one week) and accumulates the same. Among them, the maximum used hot water amount for the past seven days is calculated as a past actual value.
[0052]
Incidentally, an example of the calculation will be described below. First, the maximum used heat amount Qo for the past seven days is calculated. It is a value obtained by integrating the amount of heat used per liter used on the day of the day (for example, 23:00 the previous day to 23:00 on the day). Equation 1 shows the equation for calculating the heat quantity of one liter.
[0053]
[Formula 1] Qs1L = (Thw−THWA) × specific gravity / radiation loss coefficient
However, Qs1L: heat amount of 1 liter, Thw: hot water supply temperature, THWA: average water supply temperature, heat dissipation loss coefficient: 0.9
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 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 feed water temperature is integrated at regular time intervals, and an average value is obtained at 23:00. The specific gravity is a conversion constant from temperature to heat, and is obtained from Expression 2. The heat dissipation loss coefficient is set to 0.9.
[0054]
## EQU2 ## Specific gravity = (− 2 × 10 ^-6 × Thw ² -2.7 × 10 ^-4 × Thw + 1.0058)
However, Thw: hot water supply temperature
Each time the flow 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.
[0055]
[Formula 3] Qday = ΣQs1L
However, Qday: the amount of heat used per day, the integrated value of the amount of heat used per liter (23:00 on the previous day to 23:00 on the day), the amount of heat used for each day up to one week before, Qdayn, Qdayn- The maximum value of 1, Qdayn-2,..., Qdayn-5, and Qdayn-6 is defined as the maximum amount of heat Qo.
[0056]
## EQU4 ## The maximum amount of used heat Qo = Max (Qdayn, Qdayn-1, Qdayn-2, Qdayn-3, Qdayn-4, Qdayn-5, Qdayn-6) Here, the target heat storage amount is set so that the hot water is not drained. Set it to the safe side and use the maximum amount of heat. In addition, the average of the week may be used as the target heat storage amount, and the average may not be a weekly cycle. Then, the boiling temperature is converted into the maximum amount of hot water at a predetermined temperature (for example, 60 ° C.) based on the obtained maximum amount of used heat, and is set as a past actual value.
[0057]
[Formula 5] Maximum hot water consumption Lt = Qo / ((Tavg-THWA) × specific gravity × 4.18)
However, Tavg: average temperature in the tank
Accordingly, in the standard mode of only the hot water and the midnight only, it is possible to automatically select the minimum hot water storage amount based on the maximum used hot water amount according to the past recent results, so that the hot water is not run out and the optimum hot water storage is performed. There is no wasteful heat radiation because the amount can be reduced. In addition to the standard of each mode, a hot water operation and a hot water moderation are further provided, as shown in the characteristic column of FIG. 3, so that a hot water running operation that can secure an appropriate hot water storage amount according to the amount of hot water used by the user. Can be.
[0058]
According to the hot water supply type hot water supply apparatus of the first embodiment, in this type of hot water supply type hot water supply apparatus, the amount of hot water used varies depending on the user. Therefore, in the present invention, the selection range of the boiling operation is expanded, and an operation mode selection switch 110 for selecting one of the plurality of hot water storages according to the selected section is further provided. By using the reference value as a standard and having hot water supply setting temperature switches 120a and 120b for selecting one of the upper limit for the standard, the hot water reserve as the lower limit, and the standard, a plurality of selections are made first. The boiling operation mode can be selected according to the amount of hot water used by the user according to the classification. This makes it possible to secure a hot water storage amount according to the amount of hot water to be used from among a plurality of selection sections, as compared with the related art in which the boiling operation mode is fixed so as to have a large hot water storage amount. Therefore, there is no drainage, no wasteful heat radiation, and the electricity cost is reduced.
[0059]
More specifically, the operation mode selection switch 110 is used to select a hot water storage amount at least in a full tank mode in which a large amount of hot water is desired, an automatic mode in which a hot water storage amount according to a past used hot water amount is desired, and a use mode. By selecting one of the saving modes that minimize the amount of hot water and save the amount of hot water as much as possible, it is possible to select the boiling operation according to the amount of hot water used, even in the full tank mode, the automatic mode, or only the midnight mode. it can.
[0060]
Further, the amount of hot water used varies depending on environmental changes such as seasons. Therefore, in the present invention, the boiling water operation is performed by obtaining the minimum hot water storage amount based on the maximum hot water usage in the accumulated data of the past week, so that the hot water storage amount corresponding to the hot water usage can be secured. As a result, the hot water does not run out.
[0061]
Furthermore, the hot water storage amount for boiling only the required amount is automatically selected based on the accumulated data of the used hot water amount in the past. However, the present invention is not limited to this, and it is also possible to select from a predetermined predetermined hot water storage amount. good. According to this, although the accuracy is slightly inferior to the amount of hot water used in the past, the amount of hot water stored according to the amount of hot water used can be secured.
[0062]
The display unit 130 of the operation panel 100 is provided with a display for selecting one of the operation modes from the operation mode selection switch 110 and the hot water supply set temperature switches 120a and 120b, and displays a plurality of operation modes. By configuring the display to be identified according to the selection, for example, as identified by the positive display or the negative display according to the selection, the user can easily select and operate.
[0063]
(2nd Embodiment)
In the above-described first embodiment, the heat pump unit 2 is controlled so that the minimum amount of hot water stored in various operation modes is maintained at a predetermined temperature and the boiling operation is performed. However, the present invention is not limited to this. (For example, 50 L) may be fixed and the boiling temperature may be varied.
[0064]
A specific example will be described with reference to FIG. FIG. 5 is a characteristic diagram showing the relationship between the boiling temperature and the past amount of hot water, and the characteristic indicated by the solid line shows the relationship between the boiling temperature and the past amount of hot water in the standard mode. Point A shown in the figure is a strong point at which the target hot water storage heat quantity Qa, which is the sum of the past used heat quantity and the minimum hot water storage heat quantity, the tank capacity (for example, 300 L), and the hot water storage heat quantity Qb determined by the boiling temperature are equal. ing.
[0065]
In the case of the used heat amount at the point A, the hot water can be stored up to the full tank by setting the boiling temperature to the maximum of 90 ° C. in the late night time zone when the charge is set to the lowest. Therefore, at this time, it is possible to reduce the electricity bill without the need for the boiling operation in the daytime hours when the charge setting is the highest. Note that the past used heat amount is the maximum used heat amount Qo obtained by the used hot water amount calculation means described in the first embodiment.
[0066]
On the other hand, point B shown in the figure indicates a point at which the amount of hot water used per day can be covered even when the boiling temperature is set at 65 ° C. based on the amount of hot water used in the past. By raising the temperature to the boiling temperature (for example, 75 ° C.), the heat storage capacity Qb can be increased. Further, in the hot water mode, the amount of heat Qb that can be stored can be reduced by lowering the temperature (for example, 65 ° C.) to the boiling temperature indicated by the broken line in the figure.
[0067]
Here, the calculation of the boiling temperature can be obtained by Expression 6.
[0068]
Formula 6: Boiling temperature Tt = Qa / ((tank capacity−minimum hot water storage amount) × specific gravity × 4.18) + THWA
Where Qa is the target hot water storage calorie
Equation 6 above is a boiling temperature calculating means for calculating the boiling temperature Tt from the target hot water storage amount Qa, and is provided in a ROM (not shown) in the control device 200.
According to the hot water storage type hot water supply apparatus according to the above second embodiment, the amount of hot water can be reduced by changing the boiling temperature, that is, if the boiling temperature is high, the amount of hot water can be reduced. For example, the selection of a plurality of hot water storage amounts may be selected as the standard boiling temperature by increasing the amount of hot water storage.
[0069]
(Other embodiments)
In the above embodiment, the present invention is applied to the heat pump unit 2 including the supercritical heat pump including the refrigerant functional components included in the heat pump cycle such as the compressor, the condenser, the decompressor, and the evaporator, but is not limited thereto. You may apply to the heating means which comprises a general heat pump cycle. Further, 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 electric power.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of a hot water supply type hot water supply apparatus according to a first embodiment of the present invention.
FIG. 2A is a front view showing a configuration of an operation panel 100, FIG. 2B is a front view showing a normal display mode of a display unit 130 shown in FIG. 2A, and FIG. And (d) is a front view showing a display mode during the setting of the boiling operation mode.
FIG. 3 is a characteristic diagram showing characteristics in a boiling operation mode in the first embodiment of the present invention.
FIG. 4 is a flowchart illustrating a control process of a boiling operation of the control device 200 according to the first embodiment of the present invention.
FIG. 5 is a characteristic diagram showing a relationship between a boiling temperature and a past amount of hot water used in a second embodiment of the present invention.
[Explanation of symbols]
1. Hot water storage tank
2. Heat pump unit (heating means)
100 ... operation panel (operation means)
110 ... operation mode selection switch (first operation mode selection means)
120a: Hot water temperature setting switch, high switch (second operation mode selection means)
120b: Hot water supply temperature setting switch, low switch (second operation mode selection means)
200: control device (control means)

Claims (7)

A hot water storage tank (1) for storing hot water for hot water supply inside,
Heating means (2) for boiling water in the hot water storage tank (1) to a hot water storage quantity corresponding to the hot water usage;
Operating means (100) for selecting and operating an operation mode for boiling the heating means (2);
And a control means (200) for controlling the heating means (2) based on an operation signal output by the operation means (100).
A first operation mode selection means (110) for selecting one of the operation modes for boiling the heating means (2) in accordance with a plurality of hot water storage amount selection sections; A second operation mode selection means for selecting a hot water storage amount selected by the first operation mode selection means (110) as a reference value and selecting any one of an upper limit, a lower limit, and the reference value for the reference value. (120a, 120b). The control means (200) is provided with a used hot water amount calculating means for calculating the used hot water amount from the hot water supply amount from the hot water storage tank (1) within a predetermined period and accumulating data, and the second operation mode selection 2. The hot water storage according to claim 1, wherein the means (120 a, 120 b) is configured such that the reference value of the hot water storage amount is automatically selected from accumulated data calculated and accumulated by the used hot water amount calculation means. 3. Water heater. The control means (200) calculates the amount of hot water used from the amount of hot water supplied from the hot water storage tank (1) within a predetermined period, and accumulates data. A target hot water storage amount obtained by adding the used hot water amount and the minimum hot water storage amount obtained from the accumulated data accumulated therein, and a boiling temperature calculating means for obtaining a boiling temperature from the target hot water storage amount, The second operation mode selection means (120a, 120b) is configured to select a reference value of the hot water storage amount and an upper limit and a lower limit of the reference value based on the boiling temperature calculated by the boiling temperature calculation means. The hot-water storage type hot-water supply device according to claim 1, wherein: The predetermined period is the past week, and the second operation mode selecting means (120a, 120b) is characterized in that the reference value of the hot water storage amount is the maximum used hot water amount in the accumulated data of the past one week. The hot water supply type hot water supply apparatus according to claim 2 or 3. The said 2nd operation mode selection means (120a, 120b) selects the upper limit and the lower limit of the said reference value of a hot-water storage amount from the predetermined hot-water storage amount containing at least 0 preset. Hot water storage system. The first operation mode selection means (110) includes a full tank mode in which the hot water storage selection section desires at least a large-capacity hot water storage, an automatic mode in which a desired hot water storage in accordance with a past used hot water storage is desired, and The hot water storage type hot water supply apparatus according to claim 1, wherein one of the saving modes in which the amount of hot water used is suppressed as much as possible is selected. The operation means (100) is provided with a display for selecting one of the operation modes from the first operation mode selection means (110) and the second operation mode selection means (120a, 120b), The hot water supply type hot water supply apparatus according to claim 1, wherein the second operation mode selection means (120a, 120b) is configured such that a display of a plurality of operation modes is identified according to the selection.

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