JP5050617B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type water heater using a heat pump or an electric heater as a heating means.

  A conventional hot water storage type water heater is, for example, as shown in Patent Document 1.

FIG. 3 shows a configuration of a conventional hot water storage type hot water heater, which uses a heat pump type as a heating means. In FIG. 3, 1 is a compressor, 2 is a radiator, 3 is an expansion valve, 4 is an evaporator, and the compressor 1, the radiator 2, the expansion valve 3, and the evaporator 4 are sequentially connected, A refrigerant circuit of a heat pump as the heating means 11 is configured. 5 is a hot water storage tank, 6 is a water circulation pump, 7 is a heat medium heat exchanger for exchanging heat with the radiator 2, and the water circulation pump 6 and the heat medium heat exchanger 7 communicate with the lower and upper parts of the hot water storage tank 5. A heat medium circulation path is configured. Reference numeral 8 denotes a temperature detector, which is provided at the outlet of the heat medium heat exchanger 7, detects the medium temperature, and issues a signal. A plurality of hot water storage tank temperature detectors 9 detect the heat medium temperature inside the hot water storage tank 5 and generate a signal. Reference numeral 10 denotes a control means, which changes the heating setting temperature in the next midnight time zone, reflecting the actual state of the amount of heat used in the past daytime time zone. In other words, when the amount of heat used is low, the set temperature for boiling is lowered, and when the amount of heat used is high, the set temperature for boiling is increased, ensuring the necessary amount of hot water and ensuring that there is no shortage of hot water. The operation of the heating means 11 is reduced as much as possible in the high daytime hours.
JP 2003-14303 A

  However, in the conventional configuration, when the amount of heat used in the past daytime hours is large, the heating temperature is set at the next midnight time zone and the necessary heat amount is increased to ensure the necessary heat amount. The running cost can be reduced by raising the temperature, but on the other hand, if the boiling temperature is raised, in areas containing a lot of mineral components, the mineral components accumulate as scale inside the water heater by raising the temperature of the hot water. In particular, there is a problem that the pipe is clogged when it is deposited on a thin pipe portion such as the heat medium heat exchanger 7 and the reliability as the water heater is impaired.

  The present invention solves the above-mentioned conventional problems, and aims to provide a hot water storage type hot water heater with improved reliability by setting an upper limit of the boiling temperature in a water quality region with a lot of mineral components. To do.

In order to solve the above-mentioned conventional problems, a hot water storage type water heater of the present invention comprises a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, and a bath heating for reheating the hot water in the bathtub. Means, control means, and the control means calculate the necessary heat amount from the hot water supply heat amount and calculate the boiling temperature of the hot water stored in the hot water storage tank for setting the power system during the trial operation after installation. A temperature setting unit, and the control means is configured to set the upper limit value of the boiling temperature in the temperature setting unit according to the electric power company setting set during the trial operation. Since the upper limit of the raised temperature can be automatically switched, it is possible to provide a hot water storage type hot water heater that suppresses scale accumulation and has higher reliability.

  The present invention can automatically change the upper limit of the boiling temperature in a water quality region with a large amount of mineral components, so that it is possible to provide a hot water storage type hot water heater with reduced scale accumulation and higher reliability. .

A hot water storage type water heater of the first invention includes a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a bath heating means for reboiling hot water in the bathtub, a control means, The control means includes an electric power company storage means for setting an electric power system during a trial operation after installation, and a temperature setting unit that calculates a necessary heat amount from the hot water supply heat amount and calculates a boiling temperature of hot water stored in the hot water storage tank, The control means automatically switches the upper limit of the boiling temperature in water quality areas with many mineral components by setting the upper limit value of the boiling temperature in the temperature setting section according to the power company setting set during the trial operation. Therefore, it is possible to provide a hot water storage type water heater that suppresses the accumulation of scale and has higher reliability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment)
FIG. 1 is a configuration diagram of a hot water storage type water heater in the present embodiment. A solid line arrow indicates the flowing direction of hot water, and a dotted line arrow indicates signal communication. In FIG. 1, hot water heated by a heat pump or an electric heater is stored in a hot water storage tank 5. In this embodiment, heating is performed by the heat pump 11 and hot water is stored in the hot water storage tank 5, but the present invention is not limited to this embodiment, and hot water in the hot water storage tank 5 is heated by an electric heater or the like. Also good.

  The heat pump 11 is configured by sequentially connecting the water-refrigerant heat exchanger 7, the compressor 1, the evaporator 4, and the expansion valve 3 in an annular manner through a refrigerant pipe, and uses carbon dioxide as the refrigerant. Since the critical pressure is exceeded on the side, the water flowing through the water-refrigerant heat exchanger 7 does not condense even if the temperature is lowered due to heat being taken away, and the temperature between the refrigerant and water is reduced by the water-refrigerant heat exchanger. A difference is easily formed, high-temperature hot water can be obtained, and heat exchange efficiency can be increased. Also, in order to increase the heat exchange efficiency, it is common to make the piping narrower and longer to increase the contact area. In addition, since carbon dioxide, which is relatively inexpensive and stable, is used as the refrigerant, the product cost can be reduced and the reliability can be improved. In addition, carbon dioxide has an ozone depletion coefficient of zero and a global warming coefficient of about 1/700 of the alternative refrigerant HFC-407C, which is very small.

  In addition, the refrigerant is compressed by the compressor 1, the refrigerant discharged from the compressor 1 dissipates heat by the water refrigerant heat exchanger 7, is decompressed by the expansion valve 3, and then absorbs heat from the air by the evaporator 4, The gas is again sucked into the compressor 1. In the compressor capacity control and the expansion valve 3 opening control, the temperature of the discharge refrigerant detected by a thermistor (not shown) provided on the discharge side of the compressor 1 is maintained at a preset temperature. Controlled. The hot water in the hot water storage tank 5 flows into the water / refrigerant heat exchanger 7 by the operation of the water circulation pump 6, exchanges heat with the refrigerant, returns to the hot water storage tank 5 again, and in the stacked state, Hot water is stored at the top. Then, the temperature setting unit 12 calculates the required hot water storage amount from the past heat consumption, determines the boiling temperature, and controls the heat pump 11 and the water circulation pump 6 so that the thermistor 8 reaches a predetermined temperature.

  On the other hand, along with the hot water supply to the hot water supply terminal 15 and the bathtub 16, hot hot water is discharged from the hot water discharge pipe 27 disposed in the upper part of the hot water storage tank 5, and the electric mixing valve 17 serving as bath water temperature control means, hot water supply It is mixed with water at an appropriate temperature by an electric mixing valve 24 which is a terminal hot water temperature control means. In the present embodiment, the hot water mixed by the electric mixing valve 17 is supplied to the bathtub 16, and the hot water mixed by the electric mixing valve 24 is supplied to the hot water supply terminal (faucet) 15. In this embodiment, the electric mixing valve is used as the mixing means for hot water and water. However, the output temperature may be made constant by using a wax thermo mixing valve.

  Further, the return port 28 that is returned as hot hot water from the water / refrigerant heat exchanger 7 to the hot water storage tank 5 is provided separately from the hot water outlet pipe 27, so that hot water is supplied to the hot water supply terminal 15 and the bathtub 16. While supplying, the hot water in the hot water storage tank 5 can be boiled.

Between the bathtub 16 and the electric mixing valve 17, the flow rate of the hot water supplied to the electromagnetic valve 18 which is a two-way bath circuit shut-off means for stopping hot water supplied from the hot water storage tank 5 and the hot water supplied to the bathtub 16 is set. A flow rate sensor 19 which is a bath flow rate detection means to detect and a thermistor 20 which is a bath water temperature detection means to detect the temperature of hot water supplied to the bathtub 16 are provided, and electric mixing is performed based on the detection value of the thermistor 20. The valve 17 is controlled. In addition, a primary-side circulation circuit in which a primary-side water circulation pump 21 and a water heat exchanger 22 are annularly connected sequentially from the lower part to the upper part of the hot water storage tank 5, a secondary-side water circulation pump 23, and a water heat exchanger 22. Is provided with a bath heating means composed of a secondary circulation circuit that is sequentially connected to the bathtub 16 in an annular manner, and by controlling the primary water circulation pump 21 and the secondary water circulation pump 23, The bath can be kept warm and reheated by heat exchange with the hot water in the tank 5. Further, in order to increase the heat exchange efficiency in the water heat exchanger 22, it is common to make the piping narrower and longer to increase the contact area.

  Between the hot water supply terminal (faucet) 15 and the electric mixing valve 24, a flow rate sensor 25, which is a hot water supply terminal flow rate detecting means for detecting the flow rate of hot water supplied from the hot water storage tank 5, and the hot water supply terminal (faucet) 15. A thermistor 26 serving as a hot water supply terminal hot water temperature detecting means for detecting the temperature of the supplied hot water is provided, and the electric mixing valve 24 is controlled based on the detected value of the thermistor 26.

  In the present embodiment, the remote controller 14 performs various settings such as filling the bathtub 16 and setting the temperature of the hot water supply terminal (faucet) 15, but a plurality of remote controllers may be provided as appropriate. Further, since the remote controller 14 is configured to display information or generate sound in response to a command from the control means 10, the remote controller 14 is easy to understand for the user.

  Hereinafter, the hot water supply to the bathtub 16 and the hot water supply terminal (faucet) 15 will be described.

  The user sets the desired amount of hot water filling and hot water filling temperature to the bathtub with the remote controller 14 installed in the bathroom, and transmits the set values from the remote controller 14 to the control means 10 for controlling the hot water filling to the bathtub. By doing so, you can automatically fill the bathtub.

  Further, when it is desired to discharge hot water from the hot water supply terminal (faucet) 15, a desired hot water supply temperature is set by the remote controller 14 and transmitted from the remote controller 14 to the control means 10 that controls the hot water supply temperature of the hot water supply terminal (faucet) 15. The electric mixing valve 24 can be controlled based on the temperature of the thermistor 26 to discharge hot water from the hot water supply terminal (faucet) 15.

  Regarding the hot water storage type water heater configured as described above, the operation and action of the control means 10 will be described below.

  Normally, when the power is turned on for the first time after installation, a test run is performed to check the operation of the water heater. Various settings such as a charge system setting and a time setting based on the power contract are also made at this time and stored in the storage device of the control means 10. In recent years, hourly rate systems for electric power contracts have become widespread, and each electric power company has also set various hourly rate systems, and the control means is the one that selects the electric company and the fee system with the remote controller 14 during trial operation. 10 is stored in the electric power company storage means 13 in 10.

  Here, when it is known in advance that the water quality of an area of a certain electric power company is a region where there are many mineral components and scale deposition is likely to occur, the temperature setting unit 12 is set by the electric power company stored in the electric power company storage means 13. The upper limit value of the boiling temperature is set for each.

  For example, the area of electric power company A has few mineral components, so there is no upper boiling limit, and the area of electric power company B has more mineral components, so the upper boiling temperature limit is 80 ° C, and the area of electric power company C is mineral. Since there are so many components, the boiling temperature upper limit is set in advance to 75 ° C.

  When the power company B is set during the trial operation, the power company B is stored in the power company storage means 13. When the amount of heat used by the user such as hot water supply or bathing is large, the temperature setting unit 12 sets the boiling temperature to 90 ° C. as a calculation result of the necessary heat amount.

  On the other hand, since the electric power company B is stored in the electric power company storage means 13 and the boiling temperature upper limit is 80 ° C., the control means 10 causes the heat pump 11 and the water circulation so that hot water of 80 ° C. is stored in the hot water storage tank 5. The pump 6 is controlled.

  As described above, generally, when the temperature of hot water rises, the scale is likely to be generated, and is accumulated in a portion where the water piping is narrow, such as the water refrigerant heat exchanger 7 of the heat pump 11 and the water heat exchanger 22 of the bath heating means. In some cases, clogging of piping may occur and the performance as a water heater can be demonstrated. On the other hand, by keeping the boiling temperature low beforehand, scale generation can be prevented and the reliability of the water heater can be improved. be able to.

  As described above, by setting the upper limit of the boiling temperature setting according to the electric power company setting at the time of trial operation, scale accumulation can be suppressed by suppressing the boiling temperature in water quality areas with many mineral components. It is possible to provide a hot water storage type hot water heater that can increase the reliability of the machine and does not give the user a feeling of discomfort. In addition, since it is not necessary to manage products for each destination, product types can be reduced, and management costs can be reduced.

  As described above, the present invention is not limited to a heat pump type hot water storage water heater, but can be used for a hot water storage water heater using an electric heater system.

Configuration diagram of a hot water storage type water heater in an embodiment Flowchart in the embodiment Configuration diagram of a hot water storage type water heater in a conventional embodiment

DESCRIPTION OF SYMBOLS 1 Compressor 2 Radiator 3 Expansion valve 4 Evaporator 5 Hot water storage tank 6 Water circulation pump 7 Water refrigerant heat exchanger 8 Thermistor (boiling hot water temperature detection means)
DESCRIPTION OF SYMBOLS 9 Hot water storage tank temperature detector 10 Control means 11 Heat pump 12 Temperature setting part 13 Electric power company memory | storage means 14 Remote control 17 Electric mixing valve (bath hot water temperature control means)
18 Solenoid valve (bath circuit cutoff means)
19 Flow rate detection device (bath flow rate detection means)
20 Thermistor (Bath water temperature detection means)
21 Primary side water circulation pump 22 Water heat exchanger (bath heating means)
23 Secondary side water circulation pump 24 Electric mixing valve (hot water supply terminal hot water temperature control means)
25 Flow rate detection device (hot water supply terminal flow rate detection means)
26 Thermistor (hot water supply terminal hot water temperature detection means)

Claims (1)

A hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a bath heating means for reheating the hot water in the bathtub, a control means, and the control means are set for an electric power system during a trial run after installation. Electric power company storage means for calculating the required heat amount from the hot water supply heat amount and calculating the boiling temperature of the hot water stored in the hot water storage tank, the control means to the electric power company setting set during the trial operation Accordingly , the hot water storage type hot water heater is characterized in that the upper limit value of the boiling temperature is set in the temperature setting unit .

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