JP2006162205A - Hot water storage type hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type hot water supply system capable of preventing reduction in heating efficiency (a coefficient of performance) in boiling-up by preventing the formation of tepid water, in a heating system using a heat pump cycle. <P>SOLUTION: This hot water storage type hot water supply system has a hot water storage tank 1, and boils up water in the hot water storage tank by using the heat pump cycle, and has a plurality of boiling-up modes of boiling up the water in the hot water storage tank 1 and a plurality of temperature raising operation modes of raising the temperature when the hot water temperature of bathtub water drops. A control part 30 automatically selects one of the plurality of bathtub water temperature raising operation modes by following selection of this boiling-up mode. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water storage type hot water supply system having a hot water storage tank.

  When the temperature of the bath water drops in a conventional bath device, the amount of remaining hot water in the hot water storage tank is detected, and if there is sufficient remaining hot water in the hot water storage tank, hot hot water is used. In some cases, the heating is performed by reheating, and the heat source selection at the time of reheating the bath water is automated (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 4-6344 (page 2-3, FIG. 2-3)

However, the above-mentioned conventional configuration is for heating and reheating a bath using a heating method using a heater, and cannot enjoy the merit of using the heating method for heating using a heat pump cycle. .
When boiling with a heating method using a heat pump cycle, it is known that the temperature before boiling is as low as possible, so that the heating efficiency (coefficient of performance) during boiling can be prevented from decreasing, and it is economical. Yes. In particular, in a configuration that uses the energy of hot water in the hot water storage tank as a source of heat for the hot water storage hot water system in recent years, the hot water temperature in the hot water storage tank has dropped due to the hot water bath, and the hot water in the hot water storage tank Hot water and lukewarm water are formed. When boiling is performed by a heat pump cycle in a state where medium temperature water or warm water is formed in the hot water storage tank as described above, there arises a problem that heating efficiency (coefficient of performance) is lowered.
That is, in the heating method using a heat pump cycle, when the amount of remaining hot water is small as in the above-described conventional configuration, if the temperature of the bath water is raised by reheating, lukewarm water is formed in the hot water storage tank, and There arises a problem that the heating efficiency (coefficient of performance) is lowered at the time of raising.

  The present invention has been made to solve the above-described problems, and in a heating system using a heat pump cycle, it is possible to prevent the formation of warm water and prevent a decrease in heating efficiency (coefficient of performance) during boiling. The object is to provide a hot water storage hot water supply system.

  A hot water storage hot water system according to the present invention has a hot water storage tank, and in a hot water storage hot water supply system that heats water in the hot water storage tank using a heat pump cycle, a plurality of boiling modes for boiling water in the hot water storage tank are provided. Along with the selection of the boiling mode, a plurality of bath water temperature rising operation modes are automatically selected during the bath water temperature rising operation.

  The hot water storage hot water supply system according to the present invention, in a heating system using a heat pump cycle, automatically selects an optimum temperature raising operation mode corresponding to the selection of a boiling mode in a plurality of hot water storage tanks, for example, hot water storage In the boiling mode where the amount of remaining hot water in the tank is expected to be small, the warming hot water is prevented from forming by combining the heating mode with the high temperature hot water instead of the heating mode with the chasing operation. Thus, boiling from city water becomes possible, and there is no reduction in heating efficiency (coefficient of performance) during boiling.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a heat pump hot water supply system according to Embodiment 1 of the present invention.

In FIG. 1, a water supply pipe 2 is connected to the lower part of the hot water storage tank 1, and the first and second water supply bypass pipes 2 a and 2 b are provided in the water supply pipe 2. Is connected to a hot water supply pipe 5, which is divided into a first hot water supply bypass pipe 5a and a second hot water supply bypass pipe 5b.
A heat dissipation circulation circuit 7 is connected to the upper and lower portions of the hot water storage tank 1. The heat dissipation circulation circuit 7 exchanges heat between hot water stored in the hot water storage tank 1 and bath water in the bathtub 26. And a circulation pump 10 for circulating hot water in the hot water storage tank 1 to the circulation circuit 7 for heat radiation.

A circulation circuit 12 that is a secondary side of the heat exchanger 9 is connected to the bathtub 26, and a circulation pump 13 that circulates bath water from the heat exchanger 9 to the bathtub 26 is provided in the circulation circuit 12.
A heating circulation circuit 15 is connected to the heat pump main body 14, and the heating circulation circuit 15 is connected to the upper and lower portions of the hot water storage tank 1. The heating circulation circuit 15 includes a circulation pump (not shown) in the heat pump main body 14. The water is led from the lower part of the hot water storage tank 1, heat exchange with the outside air is performed by a heat pump, the water is boiled into hot water, and returned to the upper part of the hot water storage tank 1. A temperature sensor 15 a is provided on the lower side of the hot water storage tank 1 of the heating circuit 15.

The hot water supply side mixing valve 16 is connected between the first hot water supply bypass pipe 2a and the first hot water supply bypass pipe 5a, and is supplied from the city water from the first hot water supply bypass pipe 2a and the first hot water supply bypass pipe 5a. Hot water is mixed and discharged from a hot water outlet such as the faucet 18 through the general hot water supply pipe 17.
The bath-side mixing valve 22 mixes hot water supplied from the second hot water supply bypass pipe 5b and city water supplied from the second water supply pipe 2b and supplies the mixed water to the circulation circuit 12. The on-off valve 24 is a valve for supplying and blocking hot water mixed at a desired temperature to the bathtub 26. The flow sensor 27 measures the amount of hot water supplied to the bathtub 26 through the circulation circuit 12.

  The operation unit 31 includes a heating mode setting switch 31a, a temperature raising switch 31b, a speaker 31c, and a display unit 31d. The user selects and sets the heating mode with the heating mode setting switch 31a, The temperature of the bath water is increased by the temperature switch 31b. Further, when a desired temperature or amount of hot water is set by other switches (not shown), a sound corresponding to various operations is emitted from the speaker 31c, or a display corresponding to various operations is performed on the display unit 31d.

The control device 30 includes a determination unit 30a and a storage unit 30b, and circulates based on the heating mode set by the operation unit 31, a desired temperature, a desired amount, and detection values of the temperature sensors 15a and 23 and the flow rate sensor 27. The operation of the entire system including the pumps 10 and 13, the heat pump main body 14, the hot water supply side mixing valve 16, the bath side mixing valve 22, and the on-off valve 24 is controlled.
Here, the boiling mode includes a full-boiling mode in which the entire tank is boiled in the midnight time zone, a minimum boiling-up mode in which the learning is performed in accordance with the past hot water volume, and the boiling is performed with the minimum amount of hot water.
In addition, when a user supplies hot water to the bathtub 26, the desired temperature set by the operation part 31 is about 35-45 degreeC in general.

Next, the operation of the hot water storage type hot water supply system according to the first embodiment will be described with reference to FIGS.
First, city water supplied from the water supply pipe 2 is reduced to a predetermined pressure by a pressure reducing valve (not shown) and supplied to the hot water storage tank 1. Here, the hot water storage tank 1 is always full. The water in the hot water storage tank 1 is taken out from the lower part of the hot water storage tank 1 to the heating circulation circuit 15 by the operation of a circulation pump (not shown) built in the heat pump main body 14, and heat is exchanged in the heat pump main body 14. The temperature is raised to a temperature (for example, 90 ° C.) and returned to the upper part of the hot water storage tank 1. (Arrow a in FIG. 1) Thereby, hot water is stored from the upper part of the hot water storage tank 1 little by little.

  In the case of heating by the heat pump method, when the total heating mode is selected by the heating mode setting switch 31a of the operation unit 31, when the temperature of the temperature sensor 15a becomes equal to or higher than a certain temperature (for example, 60 ° C.), the hot water storage tank 1 is turned on. It is determined that the whole amount has been boiled, and the process ends (the state shown in FIG. 2). When the necessary minimum boiling mode is selected by the boiling mode setting switch 31a, the boiling is performed not by the total amount of the hot water tank 1 but by the necessary minimum amount by learning according to the value learned by the amount of hot water used in the past. (For example, the state as shown in FIG. 3)

  At this time, the boiling heating performance by the heat pump system is high when the temperature of the water entering the heat pump main body 14 is low, but the heating efficiency of the boiling is high when the temperature of the entering water is high. It has the characteristic to do.

Next, the case where the temperature raising operation by the temperature raising switch 31b is performed will be described mainly with reference to the flowchart of FIG.
FIG. 7 is a flowchart of the temperature raising operation.

  In FIG. 7, first, in step 40 s, whether or not the temperature raising switch 31 b of the operation unit 31 is turned on is judged by the judgment unit 30 a of the control device 30. ”Direction, the control device 30 receives an instruction to start the temperature raising operation and reaches step 41 s. If the temperature raising switch 31b is not turned on, the process proceeds in the “No” direction, and a loop state is entered in step 40s.

  In step 41 s, the determination unit 30 a of the control device 30 determines whether or not the boiling temperature setting in the boiling mode setting switch 31 a stored in the storage unit 30 b of the control device 30 is the “full amount boiling mode”. However, in the case of the “full boiling mode”, the process proceeds in the “Yes” direction in the figure, reaches Step 42 s, and the speaker 31 c outputs “start chasing” by voice, After informing that it is “Idaki operation”, go to step 43s, and if it is not “full-boiling mode”, go to “No” direction, go to step 44s, and start “hot hot water from speaker 31c” ”Is output by voice, and the user is informed that the operation is“ sagging hot water operation ”, and then the process proceeds to step 45 s.

  In step 43s, the temperature raising operation of the bathtub 26 is performed by chasing. That is, first, the circulation pump 13 is operated, and the bath water in the bathtub 26 circulates in the circulation circuit 12 and returns to the bathtub 26 through the heat exchanger 9 (arrow c in FIG. 1). On the other hand, the circulating pump 10 is also operated so that hot water stored at a temperature higher than the upper part of the hot water tank 1 is guided to the circulation circuit 7 for heat dissipation and returned to the lower part of the hot water tank 1 through the heat exchanger 9 (arrow b in the figure). ). At this time, the heat exchanger 9 heats and raises the temperature of the bathtub to a temperature suitable for bathing by exchanging heat (transferring heat) from hot hot water stored in the hot water storage tank 1 to low temperature bath water. On the other hand, the hot hot water is deprived of heat and continues to return to the hot water tank 1 as medium hot water (approximately 50 ° C.), leading to step 46s.

  At this time, if the boiling mode is the “all-boiling mode”, the state is as shown in FIG. 4, but if the boiling mode is the “required minimum boiling mode”, as shown in FIG. In addition, the warm water returned to the hot water storage tank 1 may be mixed with city water, resulting in lukewarm water that can hardly be used for hot water supply (approximately 30 ° C). Since the hot water storage tank 1 cannot count as the hot water storage energy, the control unit 30 determines that the hot water is insufficient, and the heat pump main body 14 shifts to a boiling operation using a heat pump cycle. Heating efficiency (coefficient of performance) may be deteriorated.

  In step 46s, the determination unit 30a of the control device 30 determines whether or not the temperature increase target value at the time of tracking has been reached. If the temperature increase target value has been reached, the process proceeds in the “Yes” direction in FIG. At step 48s, the temperature raising operation by chasing is terminated. If the temperature raising target value is not reached, the process proceeds in the “No” direction, and a loop state is entered at step 43s and step 46s.

  On the other hand, in step 45s, the temperature raising operation of the bathtub 26 is performed with hot water. First, the bath mixing valve 22 is adjusted to a preset high temperature (generally 80 ° C. or 60 ° C., and the hot water in the hot water storage tank 1 is almost directly used), the on-off valve 24 is opened, and the flow rate sensor 27 is opened. Then, while counting the flow rate, the operation of heating hot water to the bathtub 26 is continued, and step 47s is reached.

  In step 47s, the determination unit 30a of the control device 30 determines whether or not the amount of hot water in the hot hot water has reached a predetermined amount. If the amount of hot water has reached the predetermined amount, the on-off valve 24 is turned off. It closes and proceeds in the “Yes” direction, reaches Step 49 s, terminates the temperature raising operation by the high-temperature hot water, and proceeds to “No” direction if the amount of the hot water has not reached the predetermined amount, Steps 45 s and 47 s. It becomes a loop state.

  According to this, since the warm water does not return into the hot water storage tank 1, no lukewarm water is formed (the state of FIG. 6), and the hot water in the hot water storage tank 1 is consumed by the hot water. Flows into the hot water storage tank 1, for example, even if the hot water storage energy is lowered by the hot water and the boiling operation is performed, the city water is heated, and the heating efficiency ( No decrease in the coefficient of performance.

  In this way, by automatically selecting the temperature raising operation mode at the time of operating the temperature raising switch 31b according to the selected boiling mode, the generation of lukewarm water is prevented, and the city water is drawn into the hot water storage tank 1. Since the water is heated from the city water injected into the lower part of the hot water storage tank 1, it is possible to suppress a decrease in heating efficiency (coefficient of performance) at the time of boiling.

In the first embodiment, the means for notifying the user of the difference in the temperature raising operation by voice using the speaker 31c has been described. However, for example, a display (“tracking” on the display unit 31d in FIG. It is possible to use a means for notifying the user by “displaying“ sashiyu ”or the like, or using both sound and display.
Also in this case, the same effects as those of the first embodiment can be obtained, and the degree of recognition to the user can be improved.

  As described above, according to the present embodiment, in association with selection of a plurality of boiling modes, when the temperature raising switch 31b is operated, the optimum temperature raising operation mode is automatically selected from the plurality of temperature raising modes. The generation | occurrence | production of this can be prevented and the fall of the heating efficiency at the time of boiling by a heat pump system can be suppressed.

It is a block diagram of the hot water storage type hot water supply system which shows Embodiment 1 of this invention. It is the figure which showed the state of the hot water at the time of boiling up the whole quantity in the hot water storage type hot-water supply system of FIG. It is the figure which showed the state of the hot water at the time of the required minimum boiling in the hot water storage type hot-water supply system of FIG. It is the figure which showed the change of the stored hot water at the time of chasing when the whole quantity boiling mode is selected in the hot water storage type hot-water supply system of FIG. It is the figure which showed the change of the stored hot water at the time of chasing when the required minimum boiling in the hot water storage type hot water supply system of FIG. 1 is selected. It is the figure which showed the change of the stored hot water at the time of high temperature hot water when the required minimum boiling is selected in the hot water storage type hot water supply system of FIG. It is a flowchart of the temperature rising operation | movement in Embodiment 1 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Hot water storage tank, 2 Water supply piping, 5 Hot water supply piping, 14 Heat pump main body, 26 Bathtub, 30 Control apparatus, 30a Judgment part, 30b Memory | storage part, 31 Operation part, 31a Heating mode setting switch, 31b Temperature rising switch, 31c Speaker, 31d Display unit.

Claims (3)

A hot water storage hot water supply system having a hot water storage tank and boiling water in the hot water storage tank using a heat pump cycle has a plurality of boiling modes for boiling water in the hot water storage tank. Along with this, a hot water storage type hot water supply system that automatically selects a plurality of bath water temperature rising operation modes during the temperature rising operation of the bath water. As a heating mode for boiling water in the hot water storage tank, it has a full boiling mode for boiling the entire amount of the hot water tank and a required minimum boiling mode for not boiling the total amount of the hot water tank. A hot water heating operation mode by hot water and a high temperature hot water heating operation mode by hot water, and when the full boiling mode is selected, the hot water heating operation mode of the bathtub is 2. The hot water storage device according to claim 1, wherein, when a temperature operation mode is executed and the required minimum boiling mode is selected, the temperature increase operation mode of the bath is increased and the hot water temperature increase operation mode is executed. Type hot water supply system. When there is one temperature raising switch for instructing the temperature raising operation, and when the temperature raising switch is operated, the user is informed in which temperature raising operation mode the temperature raising operation is started by voice or display. The hot water storage type hot water supply system according to claim 1 or 2, further comprising a notification function.

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