JP3855938B2 - Hot water storage water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a hot water storage hot water supply apparatus having a hot water storage tank that stores hot water for hot water supply heated by a heating operation of a heating means, and in particular, a boiling operation without causing hot water according to the amount of hot water used by a user. It relates to the selection of the operation mode for the
[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 hot water amount calculating means for calculating the amount of hot water used and a control means for controlling the expansion valve, the fluid pump, and the refrigerant compressor to perform a boiling operation.
[0003]
And in the midnight time zone when the charge setting is the lowest, the user uses hot water for hot water supply in the hot water storage tank, and the hot water storage amount in the hot water storage tank is the first predetermined amount M1 (for example, hot water at 60 ° C. is 100 L). When the lowering state is detected, the control means starts the boiling operation, and the fluid temperature on the inlet side of the fluid flow path becomes equal to or higher than the first set temperature K1, or the hot water storage amount in the hot water storage tank is the first predetermined amount M1 + α (note that When it reaches α ≧ 0, the boiling operation is stopped.
[0004]
In addition, 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 hot water storage amount in the hot water storage tank is the second predetermined amount M2 (for example, 200 ° C hot water at 60 ° C.). When the state below is detected, the control means starts the boiling operation, and the fluid temperature on the inlet side of the fluid flow path becomes equal to or higher than the second set temperature K2, or the hot water storage amount in the hot water storage tank is the second predetermined amount M2 + β (note that , Β ≧ 0)), the boiling operation is stopped.
[0005]
Further, during the daytime hours when the charge setting is high, the user uses hot water for hot water supply in the hot water storage tank, and the hot water storage amount in the hot water storage tank is lower than a third predetermined amount M3 (for example, 60 ° C hot water is 200 L). When the state is detected, the control means starts the boiling operation, and the fluid temperature on the inlet side of the fluid flow path becomes equal to or higher than the third set temperature K3, or the hot water storage amount in the hot water storage tank is the third predetermined amount M3 + γ (note that γ When it reaches ≧ 0, 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, a user who consumes a large amount of hot water in the 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. In this way, the amount of hot water used varies greatly depending on the user. Therefore, it is common to perform a boiling operation for obtaining a relatively large amount of hot water for this purpose.
[0010]
Accordingly, an object of the present invention is to take the above points into consideration, and by expanding the selection range of the boiling operation, it is possible to ensure the amount of stored hot water according to the amount of hot water used without causing hot water to run out. It is to provide a hot water storage type hot water supply apparatus.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the technical means described in claims 1 to 7 are employed. That is, in the first aspect of the present invention, a hot water storage tank (1) for storing hot water for hot water supply therein, and heating means for boiling up the water in the hot water storage tank (1) to a hot water storage amount corresponding to the amount of hot water used. (2), an operating means (100) for selecting and operating an operation mode for boiling the heating means (2), and a heating means (2 based on an operation signal output from the operating means (100). In a hot water storage type hot water supply apparatus comprising control means (200) for controlling
The operation means (100) includes a first operation mode selection means (110) that selects one of the operation modes for boiling the heating means (2) according to a plurality of hot water storage amount selection categories, and the first operation mode selection means (110). The second operation mode selection means (120a, 120a, 120), which uses the hot water storage amount selected by the first operation mode selection means (110) as a reference value and selects any one of the upper limit, the lower limit and the reference value for the reference value. 120b).
[0012]
According to the first aspect of the present invention, in this type of hot water supply apparatus, the amount of hot water used varies depending on the user. Accordingly, 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 category of the plurality of hot water storage amounts is further selected. The second operation mode selection operation means (120a, 120b) that selects any one of the upper limit, the lower limit, and the reference value with respect to the reference value using the stored hot water amount as the reference value, The boiling operation mode can be selected according to the amount of hot water used by the user according to the selection category. Thereby, compared with the conventional which performs the heating operation mode fixed so that it may become a large amount of hot water storage, the amount of hot water storage according to the amount of hot water used can be ensured from several selection divisions. Therefore, the hot water does not run out, wasteful heat dissipation is eliminated, and the electricity bill is reduced.
[0013]
In the second aspect of the present invention, the control means (200) is provided with a hot water amount calculating means for calculating 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 accumulating data. The second operation mode selection means (120a, 120b) is characterized in that the stored hot water reference value is automatically selected from accumulated data calculated and accumulated by the used hot water volume calculating means.
[0014]
According to the invention described in claim 2, since the hot water storage amount that only boiles the required amount is selected based on the accumulated data of the past hot water usage amount, the hot water does not run out, and the hot water usage is met. The amount of hot water stored can be secured.
[0015]
In the invention according to claim 3, the control means (200) includes a hot water amount calculating means for calculating 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 storing the data. The target hot water volume obtained by adding the hot water volume obtained from the accumulated data calculated by the hot water volume calculation means and the minimum hot water volume, and the boiling temperature for determining the boiling temperature from this target hot water volume The second operation mode selection means (120a, 120b) is based on the standard boiling temperature calculated by the standard boiling temperature calculation means, the reference value of the hot water storage amount, and the upper and lower limits of the reference value. It is characterized by being selected.
[0016]
According to the invention described in claim 3, in the above-described claim 2, the selection range of the boiling operation is a selection category of a plurality of hot water storage amounts with a constant boiling temperature. If the boiling temperature is reached, the amount of stored hot water can be reduced. Conversely, if the boiling temperature is lower, the amount of stored hot water may be increased, and the standard boiling temperature may be selected as a selection category of a plurality of stored hot water amounts.
[0017]
In the invention according to claim 4, the predetermined period is the past week, and the second operation mode selection means (120a, 120b) is configured to use the maximum amount of hot water used in the accumulated data of the past week as the reference value of the hot water storage amount. It is characterized by being.
[0018]
According to the invention of claim 4, the amount of hot water used varies depending on environmental changes such as the season. Therefore, in the present invention, the amount of hot water stored according to the amount of hot water used can be secured by using the maximum amount of hot water used in the accumulated data for the past week. This prevents hot water from running out.
[0019]
The invention according to claim 5 is characterized in that the second operation mode selecting means (120a, 120b) selects from a predetermined hot water storage amount including at least 0 in which an upper limit and a lower limit of a reference value of the hot water storage amount are set in advance. It is said.
[0020]
According to the invention described in claim 5, in the above-described claim 2, the amount of hot water stored for boiling only the required amount is automatically selected based on the accumulated data of the amount of hot water used for the past. Not limited to this, it may be selected from a predetermined amount of stored hot water. According to this, although the accuracy is somewhat inferior to that of claim 2, it is possible to secure the amount of hot water stored according to the amount of hot water used.
[0021]
In the invention according to claim 6, the first operation mode selection means (110) is a full tank mode in which the hot water storage amount selection section requires at least a large volume of hot water storage, and a hot water storage amount corresponding to the past actual amount of hot water used. One of an automatic mode that desires a hot water and a saving mode that desires a hot water storage amount that suppresses the amount of hot water used as much as possible is selected.
[0022]
According to the invention described in claim 6, at least one of the full tank mode, the entrusted 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.
In the invention according to claim 7, the operating means (100) is for selecting any one operation mode from the first operation mode selection means (110) and the second operation mode selection 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 seventh aspect of the invention, the display of a plurality of operation modes is provided, and the display is identified according to the selection, so that the user can easily select and operate.
[0024]
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.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, a hot water storage type hot water supply apparatus according to a first embodiment to which the present invention is applied will be described with reference to FIGS. 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.
[0026]
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.
[0027]
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, which is a hot water supply path for leading out hot water in the hot water storage tank 1, is connected to the lead-out port 13. A discharge pipe provided with a relief valve (not shown) is connected in the middle of the route of the outlet pipe 14, and 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.
[0028]
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.
[0029]
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.
[0030]
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.
[0031]
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.
[0032]
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.
[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, The water in the hot water storage tank 1 can be boiled by returning it from the discharge port 19 into the hot water storage tank 1.
[0034]
In addition, the heat pump unit 2 which is a heating means of this embodiment is a supercritical heat pump which consists of refrigerant | coolant functional components which comprise heat pump cycles, such as a compressor, a condenser, a decompressor, and an evaporator which are not shown in figure. 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.
[0035]
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.
[0036]
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.
[0037]
Further, water level thermistors 33a to 33e for detecting the temperature of hot water at the positions are arranged on the outer wall surface of the hot water storage tank 1 at positions 50L, 100L, 150L, 200L and 300L as measured from above. 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.
[0038]
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.
[0039]
Reference numeral 200 denotes a control device which is a control means, which will be described later, which is provided on temperature information from each of the thermistors 21, 32, 33a to 33e, 71, flow information from the flow counter 72, and an operation panel 100 which is an operation means. The heat pump unit 2 and the mixing valve 16 are controlled based on operation signals from the 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. 2 (a), the operation panel 100 selects and operates an operation mode for boiling the heat pump unit 2. The first operation selects any one of various operation modes. An operation mode selection switch 110 which is a mode selection means, a hot water supply temperature setting switch 120a, 120b for setting a hot water supply temperature, a forced boiling increase operation switch 140 for forcibly operating a boiling operation, a pause switch 150 for stopping a boiling operation, etc. The various switches and the display unit 130 are configured.
[0041]
First, the operation mode selection switch 110 is selected from the selection categories consisting of the amount of hot water stored in the hot water storage tank 1. Incidentally, a full tank mode in which a large amount of hot water storage (for example, 200 L or more) is desired. Only at midnight, which is an automatic mode that desires a hot water storage amount (for example, about 0 to 150 L) according to the actual amount of hot water used in the past, and a saving mode that desires a hot water storage amount (for example, about 50 L) that suppresses the amount of hot water used as much as possible This is 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 to be secured so that hot water does not run out at all times. Therefore, when the minimum amount of stored hot water becomes a predetermined value or less, the boiling operation is controlled regardless of the time zone. Omakase mode is an operation mode that learns and heats up to keep the amount of hot water stored in the daytime from the past usage record, so that it is optimal for boiling operation in the daytime hours when the charge setting is high It is controlled. The midnight only mode is a heating operation mode only for the midnight time zone in which the charge setting is the lowest, and is a mode for a user who uses a small amount of hot water.
[0043]
Next, the hot water supply set temperature switches 120a and 120b set not only the hot water supply temperature but also the hot water storage amount selected by the operation mode selection switch 110 as a reference value, whichever of the upper limit, the lower limit and the reference value A function of a selection switch which is a second operation mode selection means for selecting one of them is also provided. By the way, in this embodiment, the upper limit side can be selected with respect to the reference value by operating the △ high switch 120a side of the hot water supply set temperature switch, and the upper limit side can be selected with respect to the reference value by operating the ▽ low switch 120b side. It has become. Here, the reference value is referred to as “standard”, the upper limit of the reference value is “hot water”, and the lower limit of the reference value is referred to as “hot water moderation”.
[0044]
FIG. 2B is a front view showing a normal display mode of the display unit 130. When setting the operation mode, the operation mode selection switch 110 is operated to select the automatic mode. As shown in FIG. 2 (c), the entrusted and standard displayed in a positive manner in the figure are selected. At this time, the operation mode selection switch 110 is operated again, and the standard mode is set and operated.
[0045]
When the △ high switch 120a side is operated during the display shown in FIG. 2 (c), as shown in FIG. 2 (d), the entrusted and hot water mode shown in the figure is selected. The operation mode selection switch 110 is operated once again, and the hot water mode is set and operated. Similarly, in the display shown in FIG. 2 (c), when the other side of the ▽ low switch 120b is operated, the hot water mode of negative display is displayed in a positive manner, and the automatic mode and hot water mode are selected. ing.
[0046]
In addition, as shown in FIG. 3, in the midnight only mode, the hot water mode is selected from the standard mode and the hot water mode, as in the Omakase mode described above. In the full tank mode, only the hot water mode is selected. is there. Thereby, any one of seven types of operation modes of boiling operation can be selected.
[0047]
Note that a minimum hot water storage amount is set for each operation mode, and the predetermined minimum hot water storage value shown in the figure is set as a fixed value for hot water and hot water sparing. 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, the minimum hot water storage amount is obtained by adding the predetermined amount A to 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 minimum hot water storage amount is obtained by subtracting. However, at this time, 0 <minimum hot water storage amount <150.
[0048]
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. 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 Δ high switch 120a, and the ▽ low switch 120b, and the operation mode selection switch 110 is operated again. Thereby, as shown in FIG. 4, the control apparatus 200 starts the control process of a boiling operation (step 210). 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 greater than the set minimum hot water storage amount. Here, if the current hot water storage amount is below the minimum hot water storage amount, in step 240, the heat pump unit 2 is controlled to perform a boiling operation. Then, in the next step 250, it is determined whether or not the current hot water storage amount is not less than the minimum hot water storage amount + α (for example, about 50 L). If the current hot water storage amount is equal to or greater than the minimum hot water storage amount + α, in step 260, the heat pump unit 2 is controlled to stop the boiling operation.
[0050]
Here, the minimum amount of stored hot water, which is the starting condition and the ending condition of the boiling operation, is automatically changed and set based on the past actual value in the standard of the only mode and the midnight only mode. By the way, the past actual value is automatically selected from the hot water amount calculating means that calculates and accumulates the amount of hot water used from the amount of hot water supplied from the hot water storage tank 1 within a predetermined period (for example, one week). is there.
[0051]
This hot water amount calculating means is provided in a ROM (not shown) of the control device 200, and calculates the amount of hot water used within a predetermined period (for example, one week) and accumulates the amount of hot water used every day, and stores the accumulated data. Among them, the maximum amount of hot water used for the past seven days is calculated as a past actual value.
[0052]
An example of the calculation will be described below. First, the maximum amount of heat used Qo for the past seven days is calculated. A value obtained by integrating the amount of heat used for each liter used on the first day of the day (for example, 23:00 on the previous day to 23:00 on that day). A formula for obtaining the heat quantity of 1 liter is shown in Formula 1.
[0053]
[Formula 1]
Qs1L = (Thw−THWA) × specific gravity / heat dissipation loss coefficient
However, Qs1L: 1 liter of heat, 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 temperatures Ttwi supplied to the hot water storage tank 1 between 23:00 on the previous day and 23:00 on the current 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 when 23:00 is passed. Specific gravity is a constant for conversion from temperature to heat, and is obtained from Equation 2. The heat dissipation loss coefficient is 0.9.
[0054]
[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.
[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 each day until the past week, Qdayn, Qdayn- The maximum value of 1, Qdayn-2,..., Qdayn-5, Qdayn-6 is defined as the maximum use heat quantity Qo.
[0056]
[Formula 4]
Maximum amount of heat used Qo = Max (Qdayn, Qdayn-1, Qdayn-2, Qdayn-3, Qdayn-4, Qdayn-5, Qdayn-6) Here, the target heat storage amount is the safe side that does not cause hot water shortage, The maximum amount of heat used. In addition, the average of the week may be set as the target heat storage amount, and may not be a one-week cycle. Then, the boiling temperature is converted to the maximum amount of hot water used at a predetermined temperature (for example, 60 ° C.) from the determined maximum amount of heat used, and is used as a past actual value.
[0057]
[Formula 5]
Maximum hot water usage Lt = Qo / ((Tavg−THWA) × specific gravity × 4.18)
However, Tavg: Average temperature in the tank
As a result, in the standard mode only for fun and late at night, it is possible to automatically select the minimum amount of hot water storage based on the maximum amount of hot water used according to the recent past performance, so there is no shortage of hot water and optimal hot water storage. There is no wasteful heat dissipation because the amount can be adjusted. In addition to the standard of each mode, by providing hot water and hot water moderation as shown in the characteristic column of FIG. 3, the hot water running operation that can secure an appropriate hot water storage amount according to the amount of hot water used by the user is ensured. Can do.
[0058]
According to the hot water storage type hot water supply apparatus of the first embodiment described above, in this type of hot water storage 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 and operating any one of the hot water storage amount according to a selection category of a plurality of hot water storage amounts, and the selected hot water storage amount By using the hot water supply set temperature switches 120a and 120b for selecting any one of the hot water that is the upper limit, the hot water moderation that is the lower limit, and the standard with the reference value as the standard, first, a plurality of selections are made. The boiling operation mode can be selected according to the amount of hot water used by the user. Thereby, compared with the conventional which performs the heating operation mode fixed so that it may become a large amount of hot water storage, the amount of hot water storage according to the amount of hot water used can be ensured from several selection divisions. Therefore, the hot water does not run out, wasteful heat dissipation is eliminated, and the electricity bill is reduced.
[0059]
Specifically, the operation mode selection switch 110 switches the hot water storage amount selection section to at least a large-capacity hot water storage mode, a hot water storage mode according to past actual hot water usage, and the use mode. By selecting one of the saving modes in which the desired amount of hot water is stored with the minimum amount of hot water, it is possible to select the boiling operation according to the amount of hot water used even in the full tank mode, Omakase mode, and midnight only mode. it can.
[0060]
In addition, the amount of hot water used varies depending on environmental changes such as the season. Therefore, in the present invention, the amount of hot water stored in accordance with the amount of hot water used can be secured by determining the minimum amount of hot water stored based on the maximum amount of hot water used in the accumulated data for the past week and performing the boiling operation. This prevents hot water from running out.
[0061]
Furthermore, the hot water storage amount that boils only the required amount is automatically selected based on the accumulated data on the amount of hot water used for the past, but not limited to this, it is also possible to select from a predetermined hot water storage amount set in advance. good. According to this, although the accuracy is slightly inferior to the amount of hot water used for the past, it is possible to secure the amount of hot water stored according to the amount of hot water used.
[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. According to the configuration, for example, the display is identified according to the selection so as to be identified by the positive display or the negative display, so that the user can easily select and operate.
[0063]
(Second Embodiment)
In the first embodiment described above, the heat pump unit 2 is controlled so as to perform the boiling operation while keeping the boiling temperature at a predetermined temperature for the minimum hot water storage amount in various operation modes. (For example, 50 L) may be fixed and the boiling temperature may be controlled to be variable.
[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 used, and shows the relationship between the boiling temperature and the past amount of hot water used when the characteristic indicated by the solid line is in the standard mode. The point A shown in the figure shows a strong point where the target hot water storage heat amount Qa obtained by adding the past used heat amount and the minimum hot water storage heat amount, the tank capacity (for example, 300 L), and the hot water storage heat amount Qb determined by the boiling temperature are equal. ing.
[0065]
In the case of the amount of heat used at this point A, hot water can be stored up to a full tank by setting the boiling temperature to a maximum of 90 ° C. during the midnight hours when the rate setting is the lowest. Therefore, at this time, it is possible to reduce the electricity bill without requiring the boiling operation during the daytime when the rate setting is the highest. The past amount of heat used is the maximum amount of heat Qo obtained by the amount of hot water used calculating means described in the first embodiment.
[0066]
On the other hand, the point B shown in the figure shows the point that the amount of hot water used in a day can be covered even if the boiling temperature is set to 65 ° C. from the past amount of hot water used. The amount of heat Qb that can be stored in hot water can be increased by raising the boiling temperature to (for example, 75 ° C.). Further, in the hot water mode, the amount of heat Qb that can be stored in the hot water can be modest by lowering the temperature to the boiling temperature indicated by the broken line (for example, 65 ° C.).
[0067]
Here, the calculation of the boiling temperature can be obtained by Equation 6.
[0068]
[Formula 6]
Boiling temperature Tt = Qa / ((tank capacity−minimum hot water storage amount) × specific gravity × 4.18) + THWA
However, Qa: Target hot water storage amount
Note that the above Equation 6 is a boiling temperature calculation 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 second embodiment described above, the amount of hot water can be reduced by varying the boiling temperature, that is, if the boiling temperature is high, and conversely, if the boiling temperature is low. For example, the standard boiling temperature may be selected as a selection category of a plurality of hot water storage amounts by increasing the hot water storage amount.
[0069]
(Other embodiments)
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. You may apply to the heating means which comprises 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 a first embodiment of the present invention.
2A is a front view showing the configuration of the operation panel 100 in the first embodiment of the present invention, FIG. 2B is a front view showing a normal display form of the display unit 130 shown in FIG. And (d) is a front view showing a display form during the heating operation mode setting.
FIG. 3 is a characteristic diagram showing characteristics of a boiling operation mode in the first embodiment of the present invention.
FIG. 4 is a flowchart showing 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 the relationship between the boiling temperature and the amount of hot water used in the 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 supply 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 driving the water in the hot water storage tank (1) to a hot water storage amount corresponding to the amount of hot water used;
Operating means (100) for selecting and operating an operation mode for boiling the heating means (2);
In a hot water storage type hot water supply apparatus comprising a control means (200) for controlling the heating means (2) based on an operation signal output by the operation means (100).
The operation means (100) includes first operation mode selection means (110) for selecting any one of operation modes for boiling the heating means (2) according to a plurality of hot water storage amount selection categories, Second operation mode selection means for selecting the hot water storage amount selected by the first operation mode selection means (110) as a reference value and selecting any one of the upper limit, the lower limit and the reference value for the reference value. (120a, 120b). The control means (200) is provided with a hot water amount calculating means for calculating 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 storing data, and selecting the second operation mode selection The hot water storage according to claim 1, wherein the means (120a, 120b) is automatically selected from accumulated data calculated and accumulated by the hot water usage calculating means by the reference value of the hot water storage amount. 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 of time, and calculates the amount of hot water used to store data and the amount of hot water used for calculation. A target hot water amount obtained by adding the amount of used hot water obtained from the accumulated data accumulated and the minimum hot water storage amount, and a boiling temperature calculation means for obtaining a boiling temperature from the target hot water amount, are provided, In the second operation mode selection means (120a, 120b), the reference value of the hot water storage amount and the upper and lower limits of the reference value are selected based on the boiling temperature calculated by the boiling temperature calculation means. The hot water storage type hot water supply apparatus according to claim 1. The predetermined period is the past week, and the second operation mode selection means (120a, 120b) is characterized in that the reference value of the hot water storage amount is the maximum hot water usage in the accumulated data for the past week. The hot water storage type hot water supply apparatus according to claim 2 or claim 3. The said 2nd operation mode selection means (120a, 120b) selects from the predetermined | prescribed hot water storage amount containing at least 0 by which the upper limit and the minimum of the said reference value of the hot water storage amount were preset. Hot water storage system. The first operation mode selection means (110) is a full tank mode in which the hot water storage amount selection section requires at least a large volume of hot water storage, an entrusted mode in which a hot water storage amount according to the past actual amount of hot water used is desired, and The hot water storage type hot water supply apparatus according to claim 1, wherein any one of the saving modes in which a hot water storage amount in which the amount of hot water used is minimized is desired is selected. The operation means (100) is provided with a display for selecting any one operation mode from the first operation mode selection means (110) and the second operation mode selection means (120a, 120b), The hot water storage 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 selection.

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