JP2004020013A - Hot water storage type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type hot water supply device capable of preventing increase in a running cost caused by lack of heat quantity inside a hot water storage tank. <P>SOLUTION: When an 'entrustment mode' is set, a controller 100 operates a heat pump device 2 in a midnight time zone of low-cost electric power such that heating heat quality decided on the basis of heat radiation quantity from a bath 4 is stored in the hot water storage tank 1, in addition to hot water supplying heat quantity necessary for hot water supply per day obtained by learning on the basis of temperature information from a thermistor 15 and flow rate information from a flow rate counter 16. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hot water supply type hot water supply apparatus for storing hot water for hot water supply in a hot water storage tank.
[0002]
[Prior art]
Conventionally, a hot water storage tank for storing high-temperature hot water for hot water supply therein, and a heat pump device as a heating means for heating water in the hot water storage tank into high-temperature hot water are provided to suppress running costs. In addition, the heat pump device is operated in a predetermined time zone determined according to the electric power cost, for example, in the nighttime period when the electricity rate is low in the hourly electric light contract, and the hot water in the hot water storage tank is required for hot water supply for one day. What is heated so that it may have the required amount of heat is known.
[0003]
And in such a hot water storage type hot water supply device, the bath water in the bath tub is circulated in the heat exchanger provided in the hot water storage tank, and the hot water in the hot water storage tank is heated to maintain the temperature of the bath water in the bath tub. And those that reheat are known.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional hot water storage type hot water supply apparatus, when a large amount of heat of the high-temperature hot water in the hot water storage tank is taken out by hot water supply, the heat amount for heating the bath water by the heat exchanger may be insufficient. . In such a case, when keeping warm or reheating the bath water in the bathtub, it is necessary to operate the heat pump device and supply heat into the hot water storage tank even during the daytime when electricity rates are expensive. There is a problem that costs may increase significantly.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to provide a hot water supply type hot water supply apparatus capable of preventing running cost from increasing due to insufficient heat in a hot water storage tank.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the invention described in claim 1,
A hot water storage tank (1) for storing hot water for hot water supply inside,
A heating means (2) for heating water in the hot water storage tank (1) to produce hot water;
A heat exchanger (31) provided in the hot water storage tank (1), circulates water supplied from outside the hot water storage tank (1), and heats the hot water stored in the hot water storage tank (1). )When,
Control for heating the heating means (2) during a predetermined time period determined according to the power cost so that the hot water in the hot water storage tank (1) has a hot water supply heat quantity (Qo) necessary for hot water supply per day. Means for storing hot water, comprising:
The control means (100) controls the amount of heat required to heat the hot water from the outside via the heat exchanger (31) in addition to the amount of hot water (Qo). The heating means (2) is controlled to generate heat during the predetermined time period so as to have (Qhl).
[0007]
According to this, during a predetermined time period determined according to the electric power cost, the heat supply heat quantity (Qo) required for hot water supply per day and the heat supply heat quantity (Qhl) required for heat supply water from the outside from one day. Can be stored in the hot water storage tank (1). Therefore, it is possible to prevent running cost from increasing due to lack of heat in the hot water storage tank (1).
[0008]
Further, in the invention according to claim 2, the control means (100) determines the maximum value (Qo) of the amount of heat used for hot water supply in one day from the actual result of hot water supply within a predetermined period as the heat amount for hot water supply (Qo). It is characterized by doing.
[0009]
According to this, the amount of heat for hot water supply (Qo) required for hot water supply per day can be reduced within a range in which a shortage of heat is not generated. Therefore, it is possible to further prevent the running cost from increasing.
[0010]
In the invention according to claim 3, two pipes (32, 33) extending from the heat exchanger (31) are connected to the bathtub (4), and the heat exchanger (31) is connected to the inside of the bathtub (4). It is characterized by circulating bath water.
[0011]
According to this, the hot water in the bathtub (4) can be kept warm or reheated.
[0012]
Further, in the invention described in claim 4, the control means (100) is characterized in that the heating heat quantity (Qhl) is varied according to the set warming time of the bath water in the bathtub (4).
[0013]
According to this, the heating heat quantity (Qhl) necessary for heating the bath water for one day can be stored in the hot water storage tank (1) with high accuracy. Therefore, it is possible to further prevent the running cost from increasing.
[0014]
In the invention described in claim 5, the control means (100), when the set warming time is longer than a predetermined time, changes the heat amount for heating the bath water within the predetermined time period to the heating heat amount (Qhl). It is characterized by the following.
[0015]
According to this, it is possible to further prevent the running cost from increasing when the warming of the bath water is frequently stopped for a predetermined time shorter than the set warming time.
[0016]
Further, in the invention described in claim 6, the control means (100) determines the amount of heat for hot water supply (Qo) and the amount of heat for heating (Qhl) according to the temperature of water supplied to the hot water storage tank (1) or the outside air temperature. It is characterized in that at least one is varied.
[0017]
According to this, the amount of heat for hot water supply (Qo) required for hot water supply per day and the amount of heat for heating (Qhl) required for heating bath water for one day according to the supply water temperature or the outside air temperature that changes depending on the season or the like. Can be accurately stored in the hot water storage tank (1). Therefore, it is possible to reliably prevent the running cost from increasing.
[0018]
Further, in the invention according to claim 7, the control means (100) determines at least one of the hot water supply heat quantity (Qo) and the heating heat quantity (Qhl) according to the amount of bath water or hot water in the bathtub (4). It is characterized in that one is varied.
[0019]
According to this, according to the change in the amount of bath water and hot water in the bath tub (4), the amount of hot water (Qo) required for hot water supply including the hot water supply to the bath tub (4) and the daily bath water supply. The amount of heat for heating (Qhl) required for heating water can be accurately stored in the hot water storage tank (1). Therefore, it is possible to reliably prevent the running cost from increasing.
[0020]
Note that the reference numerals in parentheses attached to the respective means indicate the correspondence with specific means described in the embodiment described later.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 is a schematic diagram showing a schematic configuration of a hot water supply type hot water supply apparatus of the present embodiment.
[0023]
Reference numeral 1 denotes a metal (for example, stainless steel) hot water storage tank having excellent corrosion resistance. A heat insulating material (not shown) is disposed on an outer peripheral portion of the hot water storage tank so that the hot water for hot water supply can be kept warm for a long time. It has become. 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.
[0024]
On the other hand, an outlet 13 is provided at the uppermost part 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 extracting hot water in the hot water storage tank 1. The outlet pipe 14 is provided with a thermistor 15 and a flow counter 16, and the thermistor 15 provides temperature information of the hot water flowing through the outlet pipe 14, and the flow counter 16 provides flow rate information of the hot water flowing through the outlet pipe 14. Is output to the control device 100 described later.
[0025]
A mixing valve (not shown) is disposed in the outlet pipe 14 at a junction with tap water supply pipe (not shown) downstream of the flow counter 16, and the mixing valve has an opening area ratio (a hot water side communicating with the outlet pipe 14). By adjusting the degree of opening and the degree of opening on the water side communicating with the water supply pipe), hot water and water are appropriately mixed and supplied to the downstream side of the cull, shower, bath, etc. I have.
[0026]
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. I have. 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 device 2.
[0027]
A heat exchanger (not shown) is provided in a portion of the circulation circuit 20 disposed in the heat pump device 2, and heats the lower water in the hot water storage tank 1 sucked from the suction port 18 by heat exchange with the high-temperature refrigerant. Then, the water in the hot water storage tank 1 can be boiled by returning the hot water from the discharge port 19 into the hot water storage tank 1. The heat pump device 2 is a heating unit in the present embodiment.
[0028]
Thermistors 21 and 22 are provided on the upstream side and the downstream side of the heat pump device 2 of the circulation circuit 20. The thermistor 21 receives the temperature information of the water flowing into the heat pump device 2 from the inside of the hot water storage tank 1, and the thermistor 22 receives the temperature information from the heat pump device 2. Temperature information of the hot water returning to the hot water storage tank 1 is output to a control device 100 described later.
[0029]
On the other hand, a circulation circuit 30 for circulating bath water in the bathtub 4 is connected to the bathtub 4. The circulation circuit 30 includes a heat exchanger 31 disposed at an upper part in the hot water storage tank 1, two upper and lower ends of the heat exchanger 31, and two pipes 32 and 33 connecting the bathtub 4. . In this example, the heat exchanger 31 is formed by a spiral-shaped coiled tube. A circulation pump 34 is provided in the pipe 32 on the upstream side of the circulation circuit 30. When the circulation pump 34 operates, the bath water in the bathtub 4 flows from the upper part to the lower part in the heat exchanger 31 and the hot water storage tank Heat exchange is performed with the high-temperature hot water in 1 to heat the hot water.
[0030]
A plurality of thermistors 6 are arranged on the outer wall surface of the hot water storage tank 1 at intervals in the vertical direction, and output temperature information at each water level in the hot water storage tank 1 to a control device 100 described later.
[0031]
Further, reference numeral 100 in FIG. 1 denotes a control device serving as a control means. The control device 100 is provided on the temperature information from the thermistors 6, 15, 21 and 22, the flow information from the flow counter 16 and an operation panel (not shown). The heat pump device 2, the circulating pump 34, and the like are configured to be controlled in accordance with a procedure described later based on a signal from the operation switch or the like.
[0032]
Next, the operation of the hot water supply type hot water supply apparatus based on the above configuration will be described.
[0033]
FIG. 2 is a flowchart showing the overall schematic control operation of the control device 100. As shown in FIG. 2, when electric power is supplied to the hot water supply type hot water supply device, control device 100 performs a normal operation control S11, a full tank operation control S12, and a learning operation based on a signal from a switch or the like of an operation panel (not shown). One of the weaving operation control S13 and the forced operation control S14 is executed.
[0034]
First, the normal operation control will be described. When the “midnight only mode” is selected and set by a switch operation on an operation panel (not shown) and a setting signal is input to the control device 100, the control device 100 executes the normal operation control S11.
[0035]
The control device 100 controls the total capacity of the hot water storage tank 1 (in this example, during the time period when the electricity rate in the hourly light contract with the power supplier is low (in the present example, the so-called late night time between 23:00 and 7:00)). In this case, the heat pump device 2 is operated such that 370L) is filled with hot water having a specified temperature. More specifically, the heat pump device 2 is operated backward at a calculation time after 23:00 by calculating backward so that the boiling in the hot water storage tank 1 is completed at 6:30, and When the temperature reaches the specified temperature, the operation of the heat pump device 2 is stopped.
[0036]
When hot water is supplied by opening a not-shown curan or the like, high-temperature hot water is drawn out of the hot water storage tank 1 through the outlet 13. Along with this, tap water is introduced from the inlet 11 to the lower part of the hot water storage tank 1. Further, when the temperature of the bath water in the bathtub 4 is maintained or reheated, the circulation pump 34 is driven, and the bath water circulating in the circulation circuit 30 is heated by the heat exchanger 31.
[0037]
Even if the amount of heat in the hot water storage tank 1 decreases due to the above-described hot water supply or heating, in the normal operation control, the control device 100 does not operate the heat pump device 2 during the time period from 7:00 to 23:00. .
[0038]
Next, the full operation control will be described. When the “full tank mode” is selected and set by a switch operation on an operation panel (not shown) and a setting signal is input to the control device 100, the control device 100 executes the full tank operation control S12.
[0039]
Control device 100 determines that the amount of high-temperature hot water in hot water storage tank 1 has become less than a predetermined amount (250 L in this example) based on temperature information from thermistor 6 when curan or the like is opened and hot water is supplied. Regardless of the time zone, the heat pump device 2 is operated such that the entire capacity in the hot water storage tank 1 is filled with high-temperature hot water having a specified temperature.
[0040]
Next, the forced operation control will be described. The learning weaving operation control will be described later. When the “forced mode” is selected and set by a switch operation of an operation panel (not shown) and a setting signal is input to the control device 100, the control device 100 executes the forced operation control S14.
[0041]
When the entire capacity in hot water storage tank 1 is not filled with the high-temperature hot water of the specified temperature, control device 100 immediately operates heat pump device 2 to control the entire capacity of hot water storage tank 1 to the high temperature of the specified temperature. Fill with hot water. When it is determined that the hot water in the hot water storage tank 1 has decreased based on the temperature information from the thermistor 6 due to the opening of the curan or the like and the supply of hot water, the hot water storage tank 1 can be operated regardless of the time zone. The heat pump device 2 is operated such that the total capacity of the hot water is filled with the hot water of the specified temperature.
[0042]
When the “forced mode” is set, control device 100 continues this forced operation control on the set date, and switches to control based on the mode before the “forced mode” was set on the next day. Has become.
[0043]
Next, learning weaving control will be described. When the “auto mode” is selected and set by a switch operation on an operation panel (not shown) and a setting signal is input to the control device 100, the control device 100 executes the learning weaving operation control S13. FIG. 3 is a flowchart showing a schematic flow of the learning weaving operation control S13 shown in FIG.
[0044]
As shown in FIG. 3, the control device 100 first determines whether or not it is 23:00 (step S101). At 23:00, the maximum hot water supply heat quantity Qo used by one day of hot water supply within a predetermined period in the past (in this example, within the last seven days) is calculated (step S102). The maximum hot water supply heat quantity Qo is calculated based on information from the thermistor 15 and the flow counter 16.
[0045]
After calculating the maximum hot water supply heat quantity Qo, next, the heating heat quantity Qhl for heating the bath water per day via the heat exchanger 31 is added to the maximum hot water supply heat quantity Qo (step S103). The heat quantity for heating Qhl is a constant value, and in this example, considering the cold region, from the measured value of the amount of heat released from the bathtub in which 200 L of bath water at 40 ° C. is stretched when the temperature of the bathroom is −10 ° C. The heat quantity for heating Qhl is determined.
[0046]
After the execution of step S103, next, the hot water storage temperature Tp when the total heat quantity of the maximum hot water supply heat quantity Qo and the heating heat quantity Qhl becomes the heat quantity (hot water storage heat quantity) held by the high-temperature hot water in the hot water storage tank 1 is calculated. (Step S104). Further, control device 100 calculates a current hot water storage heat amount Qt in hot water storage tank 1 based on the temperature information from thermistor 6 (step S105).
[0047]
Then, the difference between the total heat quantity of the maximum hot water supply heat quantity Qo and the heating heat quantity Qhl calculated in step S103 and the current hot water storage heat quantity Qt calculated in step S105 is determined by the operation of the heat pump device 2 at 6:30. An operation start time (boiling start time) ts to be obtained by the time is calculated (step S106). The reason why the boiling start time ts is calculated with 6:30 as the operation end time (boiling end time) is that the boiling is completed by 7:00 even if the increase in the amount of stored hot water varies. That's why.
[0048]
After executing Step S106, it is determined whether or not the boiling start time ts has come (Step S107), and when the boiling start time ts has come, the operation of the heat pump device 2 is started (Step S108). Then, when it is determined from the temperature information from the thermistor 21 (or the thermistors 21 and 22) that the hot water storage temperature in the hot water storage tank 1 has reached the target hot water storage temperature Tp (step S109), the heat pump device 2 is stopped (step S110). Then, the process returns to step S101.
[0049]
When the above-described operation controls S11 to S14 are being executed, when the callan or the like is opened, the tap water is supplied from the introduction pipe 12 into the hot water storage tank 1 and the hot water storage tank 1 is supplied through the discharge pipe 14. Hot water is drawn out of the mixer, mixed with tap water at a mixing valve (not shown), and then supplied with hot water.
[0050]
In addition, when the bath water in the bathtub 4 is to be kept warm or reheated, the control device 100 operates the circulation pump 34 based on signals such as the warming time and the warming temperature set on an operation panel (not shown), Bath water is circulated in the circulation circuit 30. The bath water flowing from the bathtub 4 through the pipe 32 flows through the heat exchanger 31, exchanges heat with the high-temperature hot water in the hot water storage tank 1, is heated, and then flows back through the pipe 33 into the bathtub 4. .
[0051]
According to the above-described configuration and operation, when the "automatic mode" is set, the maximum hot water supply heat quantity Qo required for hot water supply per day and the bath water heating for one day during the so-called late night time when the power cost is low. Can be stored in the hot water storage tank 1. Therefore, it is possible to prevent the running cost from increasing by operating the heat pump device 2 during the so-called daytime when power costs are high due to the lack of heat in the hot water storage tank 1.
[0052]
Also, since the maximum hot water supply heat amount Qo is a heat amount learned from past hot water supply results, the heat amount stored in the hot water storage tank 1 does not become excessively large. Therefore, it is possible to further prevent the running cost from increasing.
[0053]
(Other embodiments)
In the above-described embodiment, the heating heat quantity Qhl is a constant value, but the control device 100 varies the heating heat quantity Qhl according to the set warming time of the bath water in the bathtub 4. Is also good. According to this, the heating heat quantity Qhl required for heating the bath water for one day can be accurately stored in the hot water storage tank 1 every day.
[0054]
If the set warming time is longer than the predetermined time, the heat amount for heating the bath water within the predetermined time period may be used as the heating heat amount Qhl. For example, even when the set heat retention time is two hours or longer, the bath water heat retention is often canceled in about two hours. In such a case, the heat amount for heating the bath water for 2 hours may be the heating heat amount Qhl. According to this, it is possible to further prevent the running cost from increasing.
[0055]
In addition, based on information from a thermistor (not shown) provided in the introduction pipe 12 and an outside temperature sensor (not shown) provided in the heat pump device 2, the control device 100 determines the temperature of water supply to the hot water storage tank 1 or the outside temperature. May be varied according to at least one of the maximum hot water supply heat amount Qo and the heating heat amount Qhl.
[0056]
According to this, according to the supply water temperature or the outside air temperature that changes depending on the season or the like, the heat supply heat quantity Qo required for hot water supply per day and the heat supply heat quantity Qhl required for heating bath water for one day are accurately stored. It can be stored in the tank 1. In addition, at least one of the maximum hot water supply heat quantity Qo and the heating heat quantity Qhl is changed for each predetermined period based on not the supply water temperature or the outside air temperature but the built-in calendar information so as to correspond to a seasonal change. Is also good.
[0057]
Further, control device 100 may vary at least one of hot water supply heat amount Qo and heating heat amount Qhl according to the amount of bath water in bathtub 4. According to this, in accordance with a change in the amount of bath water in the bath tub 4, the amount of hot water Qo required for hot water supply for one day including hot water supply to the bath tub 4 and the heating water required for heating bath water for one day The heat quantity Qhl can be accurately stored in the hot water storage tank 1. Further, the fluctuation may be controlled according to the amount of hot water in the bathtub 4 set on an operation panel (not shown).
[0058]
In the above-described embodiment, the heating heat amount Qhl is determined based on the heat release amount from the bath water 200L at 40 ° C. in the bathtub 4, but the heating heat amount Qhl is changed according to the bath water amount. It may be.
[0059]
Further, in the above-described embodiment, the heating heat quantity Qhl is a fixed value. However, thermistors are provided upstream and downstream of the heat exchanger 31 of the circulation circuit 30, and learning is performed based on bath water heating results obtained from these thermistors. The calculated value may be used as the heating calorie Qhl. According to this, it is possible to prevent the heat quantity for heating Qhl from being stored more than necessary.
[0060]
Further, in the above-described embodiment, the heat exchanger 31 is a spiral coiled tube, but may be a heat exchanger having another configuration.
[0061]
In the above-described embodiment, the heating means provided outside the hot water storage tank 1 is the heat pump device 2, but may be another heating means such as an electric heating device.
[0062]
Further, in the above embodiment, the number of hot water storage tanks 1 is one, but a plurality of hot water storage tanks may be connected in series or in parallel.
[0063]
Further, in the above-described embodiment, the water supplied from the outside of the hot water storage tank 1 into the heat exchanger 31 is the bath water in the bath tub 4, but other fluid flows through the heat exchanger 31. Alternatively, the heater may be heated by high-temperature hot water stored in the hot-water storage tank 1. For example, it may be a heating medium for floor heating or a heating medium for bathroom heating or bathroom drying.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a schematic configuration of a hot water supply type hot water supply apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart showing an overall schematic control operation of the control device 100.
FIG. 3 is a flowchart showing a schematic flow of learning weaving operation control S13 shown in FIG. 2;
[Explanation of symbols]
1 Hot water storage tank 2 Heat pump device (heating means)
4 Bath 6 Thermistor 30 Circulation circuit 31 Heat exchangers 32, 33 Piping 100 Control device (control means)
Qo Maximum hot water supply heat (hot water supply heat)
Qhl Heating amount for heating

Claims (7)

A hot water storage tank (1) for storing hot water for hot water supply inside,
Heating means (2) for heating water in the hot water storage tank (1) to make the hot water;
Heat that is provided in the hot water storage tank (1), circulates water supplied from outside the hot water storage tank (1), and is heated by the high-temperature hot water stored in the hot water storage tank (1). An exchanger (31);
The heating unit (2) generates heat during a predetermined time period determined according to the electric power cost so that the high-temperature hot water in the hot water storage tank (1) has a hot water supply heat quantity (Qo) necessary for hot water supply per day. And a control means (100) for controlling.
The control means (100) determines that the high-temperature hot water is required to heat the water supplied from the outside via the heat exchanger (31) in one day in addition to the hot water supply heat (Qo). A hot-water storage type hot water supply apparatus, wherein the heating means (2) is controlled to generate heat during the predetermined time period so as to have a heating calorie (Qhl). The said control means (100) sets the maximum value (Qo) of the amount of heat used for hot water supply for one day as the said amount of heat for hot water supply (Qo) from the actual result of hot water supply within a predetermined period. A hot-water storage type hot water supply apparatus according to item 1. Two pipes (32, 33) extending from the heat exchanger (31) are connected to a bathtub (4) so that bathwater in the bathtub (4) is circulated through the heat exchanger (31). The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein The hot water supply according to claim 3, wherein the control means (100) varies the heating heat amount (Qhl) according to a set warming time of the bath water in the bathtub (4). apparatus. The control means (100), when the set warming time is longer than a predetermined time, sets the heat amount for heating the bath water within the predetermined time period to the heating heat amount (Qhl). Item 5. A hot water supply type hot water supply device according to item 4. The control means (100) varies at least one of the hot water supply heat amount (Qo) and the heating heat amount (Qhl) in accordance with a water supply temperature into the hot water storage tank (1) or an outside air temperature. The hot-water storage type hot-water supply device according to any one of claims 3 to 5, characterized in that: The control means (100) changes at least one of the hot water supply heat quantity (Qo) and the heating heat quantity (Qhl) in accordance with the amount of bath water or hot water in the bathtub (4). The hot water storage type hot water supply apparatus according to any one of claims 3 to 6, wherein

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