JP2001041574A - Hot-water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive the reduction of heat dissipation loss and the miniaturization of a heat storage tank. SOLUTION: A hot-water supplier is provided with a heat pump 11 constituted of a compressor 12, a condenser 13, a pressure reducer 14 and an evaporator 15; a heat storage tank 16 heated by the heat of the condenser 13 to raise the temperature of the same; and a heat exchanger 25 heated by a burner 24. The compressor 12 is constituted so as to be variable in the number of revolution of the same whereby a temperature in the heat storage tank 16 becomes the intermediate temperature of heat-up temperature of 50-55 deg.C of the heat pump 11, thereby reducing heat dissipation loss. On the other hand, hot-water can be supplied through combustion when the discharge of high-temperature hot-water is necessitated whereby the size of the heat storage tank 16 can be miniaturized to the necessary minimum. Further, the number of revolution of the compressor 12 is designed so as to be variable whereby heating capacity in accordance with the remaining hot-water in the heat storage tank 16 can be coped, and the compressor 12 can be operated with a low speed when the amount of re-heating by the heat pump 11 can be small enough thereby permitting the highly efficient operation of the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater using a heat pump and combustion.

[0002]

2. Description of the Related Art Conventionally, a water heater of this kind has been disclosed in
Japanese Patent Application Laid-Open No. 95048 discloses a method. Hereinafter, the related art will be described with reference to the drawings. FIG. 10 is a configuration diagram of a conventional water heater. In FIG. 10, water at the lower part of the heat storage tank 1 is returned to the upper part of the heat storage tank 1 from the heat exchanger 4a that exchanges heat with the condenser 4 of the heat pump 3 via the circulation pump 2 and the heat exchanger 6 of the combustion water heater 5. . Then, the water in the heat storage tank 1 is heated to an intermediate temperature by the heat pump 3, and then is heated and stored to a high temperature of 80 ° C. by the combustion water heater 5. In addition, 7 in FIG. 8 is a compressor, 8 is a decompressor, 9 is an evaporator, and comprises the heat pump 3. Also, 1
Reference numeral 0 denotes a combustion burner, and reference numeral 1a denotes a hot water temperature detecting means of the hot water temperature in the heat storage tank 1.

[0003]

In the above-described conventional water heater, since the temperature of the hot water in the heat storage tank 1 is always maintained at a high temperature of 80 ° C., heat radiation loss is large. Further, the necessity of securing the amount of hot water required for tapping in the heat storage tank 1 increases the capacity of the heat storage tank 1 and poses a problem in installation space.

[0004] The present invention is to solve the above problems,
The main purpose is to reduce heat radiation loss and downsize the heat storage tank.

[0005]

In order to solve the above-mentioned problems, the present invention provides a heat pump in which a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant flow path, and heating by the heat of the condenser. The compressor has a heat storage tank whose temperature is raised and a heat exchanger which is heated by the heat of the combustion burner, and the compressor is a water heater whose rotation speed is variable.

[0006] With the above configuration, the water in the heat storage tank is stored at a predetermined temperature by operating the heat pump. The predetermined temperature is usually 50 to 55 ° C., which is sufficient for the efficiency of the heat pump and is usually higher than the tapping temperature.
, The radiation loss of the heat storage tank is reduced, and the heat insulation configuration can be simplified. Also, by providing a heat exchanger that is heated by the heat of the combustion burner, if the temperature of the hot water in the heat storage tank drops, or if hot water is required, hot water is supplied by combustion, The capacity of the heat pump unit and the heat storage tank can be set to the required minimum size, and the heat storage tank can be downsized. In addition, by changing the rotation speed of the compressor, the heating capacity of the heat pump can be changed, and the heating capacity can be adapted to the amount of remaining hot water in the heat storage tank. When the amount of reheating by the heat pump is small, high efficiency operation can be achieved by setting the compressor at a low rotation speed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A water heater that solves the above problems can be realized by the embodiments described in the claims. The invention according to claim 1 of the present invention provides a heat pump in which a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant flow path, a heat storage tank heated and heated by the heat of the condenser, A heat exchanger heated by the heat of the combustion burner, wherein the compressor has a variable number of revolutions, and water in the heat storage tank is stored by storing heat at a predetermined temperature by operation of the heat pump. Since the predetermined temperature is normally sufficient for the efficiency of the heat pump and is an intermediate temperature of 50 to 55 ° C., which is higher than the normal tapping temperature, the heat dissipation loss of the heat storage tank is reduced and the heat insulation configuration can be simplified. Also, by providing a heat exchanger that is heated by the heat of the combustion burner, if the temperature of the hot water in the heat storage tank drops, or if hot water is required, hot water is supplied by combustion, The capacity of the heat pump unit and the heat storage tank can be set to the minimum required size,
The size of the heat storage tank can be reduced. In addition, by changing the rotation speed of the compressor, the heating capacity of the heat pump can be changed, and the heating capacity can be adapted to the amount of remaining hot water in the heat storage tank. If the amount of reheating by the heat pump is small, high efficiency operation can be achieved by setting the compressor to a low rotation speed.

[0008] The invention described in claim 2 is the first invention.
In addition to the invention, a compressor having a remaining hot water amount detecting means for detecting the remaining hot water amount in the heat storage tank, and operating the compressor at a low rotation speed when the remaining hot water amount is large and operating the compressor at a high rotation speed when the remaining hot water amount is small By adopting a configuration including the rotation speed control means, when the remaining hot water amount is large and the amount of reheating by the heat pump may be small, high efficiency operation can be performed by setting the compressor to a low rotation speed, and the remaining hot water amount is small. In this case, by operating the compressor at a high rotation speed, the heating capacity of the heat pump is increased, and the amount of hot water in the heat storage tank can be secured quickly.

The invention described in claim 3 is the same as the invention in claim 2
In addition to the invention described above, the remaining hot water amount detecting means has a configuration in which a plurality of temperature detection sensors are provided in the height direction of the heat storage tank, so that the temperature distribution of the heat storage tank by the plurality of temperature sensors can be finely detected and divided. The remaining hot water amount can be detected.

[0010] The invention described in claim 4 is the first invention.
In addition to the invention of the above, there is a heat source enthalpy detecting means for detecting the heat source enthalpy of the evaporator, and the compressor is operated at a low rotation speed when the heat source enthalpy is high, and at a high rotation speed when the heat source enthalpy is low. When the heat pump capacity is high and the heat source enthalpy is high, the necessary heat pump capacity can be obtained even if the compressor is operated at a low rotation speed, and the operation is highly efficient. If the heat source enthalpy is low, the capacity of the heat pump will be reduced.If the heat source enthalpy is low, the compressor is operated at a high rotation speed to increase the heat pump capacity to reduce the amount of hot water in the heat storage tank within a predetermined time required. Can be secured.

The invention described in claim 5 is the first invention.
In addition to the invention of the above, there is a remaining hot water amount detecting means for detecting the remaining hot water amount of the heat storage tank and a heat source enthalpy detecting means for detecting the heat source enthalpy of the evaporator, and the number of rotations of the compressor is set by the value of the remaining hot water amount and the heat source enthalpy. By having the compressor rotation speed control means, when the residual hot water amount is large and the heat source enthalpy is high, by operating the compressor at a low rotation speed,
When the required heating amount can be operated with higher efficiency and the remaining hot water amount is small and the heat source enthalpy is low, the compressor can be operated at a high rotation speed to increase the heating capacity of the heat pump to increase the required heating amount and increase the heat storage tank The amount of hot water inside can be secured quickly.

The invention according to claim 6 is the first invention.
In addition to the invention of the invention, by having a compressor rotation speed control means having a clock and setting the rotation speed of the compressor for each time zone, for example, the amount of residual hot water after a small amount of use in the morning, noon dishwashing, etc. In cases where the amount of reheating by a heat pump is small, high efficiency operation can be achieved by setting the compressor at a low rotation speed. When a heating amount is required, the amount of hot water in the heat storage tank can be secured within a predetermined time by setting the compressor to a high rotation speed.

The invention according to claim 7 is the first invention.
In addition to the invention described above, the storage device has a storage unit for storing the remaining hot water pattern of the heat storage tank for several days, and a calculation unit for predicting and calculating the compressor operating speed based on the remaining hot water pattern in the storage unit. By providing the compressor rotation speed control means for setting the rotation speed, for example, the amount of remaining hot water in the heat storage tank at each time of 24 hours a day is stored for several days, and the standard heat storage tank for several days is stored. The remaining hot water amount pattern, such as the time of hot water, the hot water amount and the time for boiling water, the time interval from hot water to the next hot water, etc., is calculated, and the remaining hot water amount pattern is assumed to be a predicted pattern for the next 24 hours. Set the number of rotations of the compressor during the heat pump operation at the time of boiling. For example, the amount of hot water is relatively large in the face washing and dishwashing in the morning, the remaining hot water is medium or more, and the time interval until the next hot spring is relatively short, 3 hours. Medium-efficiency operation secures the amount of hot water in the heat storage tank by noon, only washing dishes in the daytime, the amount of hot water is small, the amount of remaining hot water is large, and it is enough for 5 hours until hot water etc. in the bath the next night Since there is time, high efficiency operation can be achieved by setting the compressor to a low rotation speed, and if there is almost no remaining hot water after a large amount of use such as hot water in a bath at night and compression is required when a large amount of heating is required By setting the rotation speed of the machine to a high speed, the amount of hot water in the heat storage tank can be secured within a predetermined time.

The invention described in claim 8 is the first invention.
In addition to the invention, an outlet hot water temperature detecting means for forming a water circulation flow path that is guided from the lower part of the heat storage tank to the condenser via a circulation pump and returned to the upper part of the heat storage tank, and detects the outlet water temperature of the condenser, By providing control means for adjusting the amount of circulating water so that the detected hot water temperature of the outlet hot water temperature detecting means becomes a predetermined predetermined temperature, the preset predetermined temperature is usually set at 55 to 65 ° C., Since stable hot water is stored from the top of the heat storage tank, hot water that can be used in a short time can be secured.

[0015] The invention according to claim 9 provides the invention according to claim 8.
In addition to the above invention, the circulating water amount is adjusted by adjusting the rotation speed of the circulating pump, so that it is not necessary to add a special valve or other parts for adjusting the circulating water amount.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In each embodiment, the same reference numerals are given to portions having the same configuration and the same operation, and redundant description will be avoided.

(Embodiment 1) FIG. 1 is a configuration diagram of a water heater according to Embodiment 1 of the present invention, and FIG. 2 is a diagram showing the relationship between the number of rotations of a compressor and the heating capacity and efficiency of a heat pump.

In FIG. 1, a heat pump 11 is constructed by connecting a compressor 12, a condenser 13, a decompressor 14, and an evaporator 15, which can change the rotation speed, through a refrigerant channel. Reference numeral 16 denotes a heat storage tank, and reference numeral 17 denotes remaining hot water detection means for the heat storage tank 16, which is provided with a plurality of temperature detection sensors 17a in the height direction of the heat storage tank 16. Water from the lower part of the heat storage tank 16 is guided to the condenser 13 by the circulation pump 18, and is heated and heated by the heat of the condenser 13 to form a circulation flow path 19 returned to the heat storage tank 16. In the lower part of the heat storage tank 16,
A pipe 20 to which tap water or the like is supplied has a tank tapping pipe 21 provided at an upper portion thereof. The heat of a combustion burner 24 constituting a combustion water heater 23 is provided on the way to a terminal curan 22 of the tank tapping pipe 21. Is disposed. Reference numeral 26 denotes a compressor rotation speed control means.
7. A remaining hot water amount comparing unit 28 and a rotation speed control unit 29, and the remaining hot water amount detecting unit 27 detects the temperatures of the plurality of temperature detection sensors 17a in the remaining hot water amount detecting unit 17 of the heat storage tank 16, and the remaining hot water comparing unit If the remaining hot water is large at 28, the compressor 12
Is controlled by the rotation speed control means 29 so that the compressor 12 is operated at a low rotation speed, and when the rotation speed is low, the compressor 12 is operated at a high rotation speed.

The operation and operation of the above configuration will be described. First, when a power supply (not shown) is turned on, since the inside of the heat storage tank 16 has not been heated yet, the plurality of temperature detection sensors 1
7a, it is detected that there is no residual hot water at a low temperature, the compressor 12 is set at a high rotation speed, the operation of the heat pump 11 and the circulating pump 18 is started, and the water in the heat storage tank 16 is set to a predetermined value. Boil to temperature (50-55 ° C). By setting the compressor 12 to a high rotation speed in this way, as shown in FIG. 2, the heat pump 11 is operated with a high heating capacity, so that the amount of hot water in the heat storage tank 16 can be secured quickly.

Next, after a small amount of use such as hand washing and dish washing, for example, in the remaining hot water amount detecting means 17 of the heat storage tank 16, only the bottom of the plurality of temperature detecting sensors 17a becomes low temperature, and the remaining hot water amount is large. Is detected, the compressor 12 is set at a low rotation speed, and as shown in FIG.
1 has a low heating capacity, but operates with high efficiency. As described above, when the amount of remaining hot water is large and the amount of reheating by the heat pump 11 may be small, high-efficiency operation can be performed by setting the compressor 11 to a low rotation speed.

In addition, since the temperature of the hot water in the heat storage tank 16 is 50 to 55 ° C. during normal tapping, the combustion burner 24 is not ignited, and the temperature of the hot water in the heat storage tank 16 decreases, or When hot water is required, the temperature is raised by combustion. Therefore, since the temperature is an intermediate temperature of 50 to 55 ° C. which is higher than the normal tapping temperature, the heat loss of the heat storage tank 16 is reduced, and the heat insulation configuration can be simplified. The heat storage tank 16
When the temperature of the hot water in the heat storage tank 16 is reduced by providing the heat exchanger 25 heated by the heat of the combustion burner 24 provided in the middle of the tank hot water pipe 21 between the hot water and the terminal curan 22 for hot water, or When a high-temperature hot water is required, the temperature can be increased by combustion, so that the heat storage tank 16 can be set to the minimum necessary size, so that the heat storage tank 16 can be downsized.

Further, since the rotation speed of the compressor 12 is variable, the heating capacity of the heat pump can be varied, and the heating capacity corresponding to the amount of remaining hot water in the heat storage tank 16 can be accommodated. In the case where the remaining hot water amount is large and the amount of additional heating by the heat pump may be small, high efficiency operation can be performed by setting the compressor 12 to a low rotation speed. Further, since the remaining hot water amount detecting means 17 has a configuration in which a plurality of temperature detection sensors 17a are provided in the height direction of the heat storage tank 16, the temperature distribution of the heat storage tank 16 can be finely detected by the plurality of temperature sensors 17a. The detected remaining hot water amount can be detected.

Although the above description has been made with reference to the configuration of the refrigerant pipe and the water pipe shown in FIG. 1, it is apparent that the same operation and effect can be obtained even if the configuration of the refrigerant pipe and the water pipe is different.
In addition, the boiling temperature of the heat pump may be from 40 ° C., and the same operation and effect can be obtained if the temperature is 65 ° C. or lower.

(Embodiment 2) FIG. 3 is a block diagram of a water heater according to Embodiment 2 of the present invention, and FIG. 4 is a diagram showing the relationship between the heat source enthalpy of the evaporator, the number of revolutions of the compressor, and the heat pump heating capacity. 3 differs from FIG. 1 in that the heat source enthalpy detecting means 3 for detecting the heat source enthalpy of the evaporator 15
0 is provided, and a heat source enthalpy detection unit 32, a heat source enthalpy comparison unit 33, and a rotation speed control unit 34 are provided in the compressor rotation speed control unit 31. The heat source enthalpy detection means 30 can use a temperature sensor for detecting the temperature of air in the case of an air heat source, and a temperature sensor for detecting the temperature of water in the case of a water heat source.

The operation and operation of the above configuration will be described.

The heat source enthalpy detection unit 32 sends the heat source enthalpy value detected by the heat source enthalpy detection unit 30 to a heat source enthalpy comparison unit 33. If the heat source enthalpy set here is high, the compressor 12 is operated at a low rotational speed. When the heat source enthalpy is low, a command is issued to the rotation speed control means 34 to operate the compressor 12 at a high rotation speed.
As shown in FIG. 4, when the heat pump 11 has a higher capacity and a high heat source enthalpy, the required heat pump capacity can be obtained even when the compressor 12 is operated at a low rotation speed, and the operation can be performed with high efficiency. If the heat source enthalpy is low, the capacity of the heat pump 11 is reduced.
By operating the heat pump 2 at a high rotation speed and increasing the heat pump capacity, the amount of hot water in the heat storage tank 16 can be secured within a predetermined time required.

(Embodiment 3) FIG. 5 is a block diagram of a water heater according to Embodiment 3 of the present invention, and FIG. 6 is a diagram showing the relationship between the heat source enthalpy of the evaporator, the number of revolutions of the compressor, the heat pump heating capacity and the remaining hot water amount. . 5 is different from FIG. 3 in that the remaining amount of hot water and the heat source enthalpy detector 32 and the values thereof are received in the compressor speed control means 35, and the compressor 1
2 in that a rotation speed setting unit 36 for setting the rotation speed 2 and a rotation speed control means 39 are provided.

The operation and operation of the above configuration will be described.

For example, when the amount of remaining hot water is large, as shown in FIG. 6, when the heat source enthalpy is high, the number of revolutions is set to a minimum, and when the heat source enthalpy is low, the number of revolutions is set to an intermediate value, so that the required heating is small. The quantity can be operated with higher efficiency. In addition, when the amount of remaining hot water is small, as shown in FIG. 6, when the heat source enthalpy is high, the rotation speed is set to an intermediate value, and when the heat source enthalpy is low, the rotation speed is set to the maximum. The heating capacity of the heat storage tank is increased, and the amount of hot water in the heat storage tank can be secured quickly.

Further, as shown in FIG. 6, by setting the case of the heat source enthalpy and the number of revolutions of the compressor finely, it is possible to perform a finer and more efficient operation or an operation capable of quickly securing the amount of hot water in the heat storage tank.

(Embodiment 4) FIG. 7 is a configuration diagram of a water heater according to Embodiment 4 of the present invention. 7 differs from FIG. 1 in that a clock 39 is provided in the compressor rotation speed control means 38, and a time zone setting unit 40 for setting the compressor rotation speed for each time zone.
This is the point that the rotation speed control means 41 is provided.

The operation and operation of the above configuration will be described. For example, the remaining amount of hot water in the heat storage tank 16 after a small amount is used for washing dishes in the morning and afternoon is large.
If the amount of reheating by heating is small, the compressor 12
When the number of rotations is low, high-efficiency operation can be performed. When the amount of remaining hot water in the heat storage tank 16 after using a large amount is almost eliminated due to hot water in a night bath or the like and a large amount of heating is required, the compressor 1 is used.
By setting 2 to a high rotation speed, the amount of hot water in the heat storage tank 16 can be secured within a predetermined time.

(Embodiment 5) FIG. 8 is a configuration diagram of a water heater according to Embodiment 5 of the present invention. 8 differs from FIG. 7 in that the remaining hot water amount detection unit 2 is provided in the compressor speed control means 42.
7, a clock 39, a pattern storage unit 43 for storing the remaining hot water pattern of the heat storage tank 16 for several days in response to these values, and the compressor 1 based on the remaining hot water pattern in the pattern storage unit 43.
A rotation speed prediction calculation unit 44 for predicting and calculating the operation rotation speed of No. 2;
This is the point that the rotation speed control means 45 is provided.

The operation and operation of the above configuration will be described. For example, the remaining amount of hot water in the heat storage tank 16 at each time of 24 hours a day is stored for several days, and the time and amount of hot water from the standard heat storage tank 16 for a few days, the time for the heating station, and The remaining hot water amount pattern such as the time interval until the hot water is discharged is calculated, and the remaining hot water amount pattern is assumed to be a prediction pattern for the next 24 hours, and the rotation speed of the compressor 12 during the heat pump operation at the time of boiling after each hot water supply is calculated. Set. For example, the amount of hot water is relatively large in the face washing and dishwashing in the morning, the amount of remaining hot water is medium or more, and the time interval until the next hot spring is relatively short, 3 hours. Medium-efficiency operation to secure the hot water in the heat storage tank by noon by daytime, only to wash dishes in the daytime, small amount of hot water, large amount of remaining hot water, enough for 5 hours to bathe in the bath the next night When the compressor 12 has a low rotation speed, high-efficiency operation can be performed, and when a large amount of hot water is needed after a large amount of water is used in hot baths at night, etc., and a large amount of heating is required. By setting the compressor 12 to a high rotation speed, the amount of hot water in the heat storage tank 16 can be secured within a predetermined time.

(Embodiment 6) FIG. 9 is a configuration diagram of a water heater according to Embodiment 6 of the present invention. 9 is different from FIG. 1 in that an outlet hot water temperature detecting unit 45 for detecting the outlet hot water temperature of the condenser 13 is provided, and the outlet hot water temperature detecting unit 4 is provided in the control unit 46.
7. An outlet hot water temperature comparison unit 48 and a pump rotation speed control unit 49 are provided.

The operation and operation of the above configuration will be described. The outlet hot water temperature detector 47 reads the signal transmitted from the outlet hot water temperature detector 45 and outputs the signal to the outlet hot water comparator 4.
In step 8, the detected temperature is set to a predetermined temperature.
The rotation speed of the circulation pump 18 is adjusted by the pump rotation speed control means 49 to adjust the amount of circulating water. As described above, the preset predetermined temperature is usually set at 55 to 65 ° C., and stable hot water is stored from the upper part of the heat storage tank, so that hot water that can be used in a short time can be secured. Further, since the circulating water amount is adjusted by adjusting the rotation speed of the circulating pump 18, there is no need to add a special component such as a valve for adjusting the circulating water amount.

[0037]

As is apparent from the above description, according to the first aspect of the present invention, a heat pump in which a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant flow path, A heat storage tank heated and heated by the heat of the heater, and a heat exchanger heated by the heat of the combustion burner, wherein the compressor is a water heater with a variable rotation speed, and water in the heat storage tank is supplied by a heat pump. In the operation, the hot water is stored at a predetermined temperature set in advance. The predetermined temperature is usually sufficient for the efficiency of the heat pump, and is 50 to 55 which is higher than the normal tapping temperature.
Since the temperature is an intermediate temperature of ° C., heat radiation loss of the heat storage tank is reduced, and the heat insulation configuration can be simplified. Also, by providing a heat exchanger that is heated by the heat of the combustion burner, if the temperature of the hot water in the heat storage tank drops, or if hot water is required, hot water is supplied by combustion, The capacity of the heat pump unit and the heat storage tank can be set to the required minimum size, and the heat storage tank can be downsized. further,
By changing the rotation speed of the compressor, the heating capacity of the heat pump can be varied, and the heating capacity can be adapted to the remaining amount of hot water in the heat storage tank. When the amount of additional heating is small, high-efficiency operation can be achieved by setting the compressor at a low rotational speed.

According to the second aspect of the present invention, there is provided a remaining hot water amount detecting means for detecting a remaining hot water amount in the heat storage tank. This is a water heater equipped with a compressor rotation speed control unit that operates the compressor at a high rotation speed.If the amount of remaining hot water is large and the amount of reheating by a heat pump is small, the compressor can be operated at a low rotation speed to achieve high efficiency. When the amount of remaining hot water is small, the heating capacity of the heat pump is increased by operating the compressor at a high rotation speed, and the amount of hot water in the heat storage tank can be secured quickly.

According to the third aspect of the present invention, the remaining hot water amount detecting means is a water heater having a structure in which a plurality of temperature detecting sensors are provided in the height direction of the heat storage tank. The temperature distribution of the tank can be finely detected, and the remaining hot water amount can be finely divided.

According to the fourth aspect of the present invention, there is provided a heat source enthalpy detecting means for detecting the heat source enthalpy of the evaporator. When the heat source enthalpy is high, the compressor is operated at a low rotation speed and the heat source enthalpy is low. In this case, the water heater is equipped with compressor speed control means that operates the compressor at a high speed.If the heat pump capacity is higher and the heat source enthalpy is high, it is necessary to operate the compressor at a low speed. High heat pump capacity and efficient operation.In addition, if the heat source enthalpy is low, the heat pump capacity is reduced.It is necessary to operate the compressor at a high rotation speed to increase the heat pump capacity. The amount of hot water in the heat storage tank can be secured within a predetermined time.

According to the fifth aspect of the present invention, there is provided a remaining hot water amount detecting means for detecting the remaining hot water amount in the heat storage tank and a heat source enthalpy detecting means for detecting the heat source enthalpy of the evaporator. Is a water heater equipped with a compressor rotation speed control means for setting the rotation speed of the compressor according to the value of the above, when the remaining hot water amount is large and the heat source enthalpy is high,
By operating the compressor at a low rotation speed, the required heating amount can be operated with higher efficiency, and when the remaining hot water amount is small and the heat source enthalpy is low, the compressor can be operated at a high rotation speed to increase the required heating amount. By increasing the heating capacity of the heat pump, the amount of hot water in the heat storage tank can be secured quickly.

According to the present invention, there is provided a water heater having a clock and a compressor rotation speed control means for setting the rotation speed of the compressor for each time zone.
If the amount of residual hot water after using a small amount is large in the daytime dishwashing, etc., and the amount of reheating by a heat pump may be small, high efficiency operation can be achieved by setting the compressor to a low rotation speed, hot water in a bath at night, etc. When the amount of residual hot water after the use of a large amount is almost lost and a large amount of heating is required, the amount of hot water in the heat storage tank can be secured within a predetermined time by setting the compressor to a high rotation speed.

According to the seventh aspect of the present invention, the storage unit for storing the remaining hot water pattern of the heat storage tank for several days, and the compressor operation speed is calculated based on the remaining hot water pattern in the storage unit. Water heater having a compressor rotation speed control means for setting the rotation speed of the compressor, for example,
The amount of hot water is relatively large during morning face washing, dishwashing, etc., the remaining hot water is medium or more, and the time interval between the next hot spring is relatively short, 3 hours. By operation, secure the amount of hot water in the heat storage tank by noon, wash only the dishes in the daytime, the amount of hot water is small, the amount of remaining hot water is large, and enough time such as bathing in the bath the next night is enough for 5 hours Since the compressor has a low rotation speed, high efficiency operation can be achieved.If the amount of remaining hot water after using a large amount is almost eliminated due to hot water in a bath at night and a large amount of heating is required, the compressor should be used. By setting the number of rotations to be high, the amount of hot water in the heat storage tank can be secured within a predetermined time.

According to the eighth aspect of the present invention, a water circulation flow path is formed from the lower part of the heat storage tank to the condenser via the circulating pump and returned to the upper part of the heat storage tank. And a control unit for adjusting the amount of circulating water so that the detected hot water temperature of the outlet hot water detecting means becomes a predetermined temperature. The predetermined temperature is usually set at 55 to 65 ° C., and stable hot water is stored from the top of the heat storage tank, so that usable hot water can be secured in a short time.

According to the ninth aspect of the present invention, the circulating water amount is adjusted by adjusting the number of revolutions of the circulating pump, and it is necessary to add special components such as valves for adjusting the circulating water amount. There is no.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a water heater according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram of a compressor rotation speed and a heat pump heating capacity / efficiency.

FIG. 3 is a configuration diagram of a water heater according to a second embodiment of the present invention.

FIG. 4 is a characteristic diagram of a heat source enthalpy and a heat pump heating capacity of an evaporator.

FIG. 5 is a configuration diagram of a water heater according to a third embodiment of the present invention.

FIG. 6 is a characteristic diagram of the heat source enthalpy and the heat pump heating capacity of the evaporator.

FIG. 7 is a configuration diagram of a water heater according to a fourth embodiment of the present invention.

FIG. 8 is a configuration diagram of a water heater according to a fifth embodiment of the present invention.

FIG. 9 is a configuration diagram of a water heater according to a sixth embodiment of the present invention.

FIG. 10 is a configuration diagram of a conventional water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Heat pump 12 Compressor 13 Condenser 14 Decompressor 15 Evaporator 16 Heat storage tank 17 Remaining hot-water amount detection means 18 Circulation pump 19 Circulation flow path 24 Combustion burner 25 Heat exchanger 26 Compressor speed control means 30 Heat source enthalpy detection means 36 Rotation Number setting unit 39 Clock 40 Time zone setting unit 43 Pattern storage unit 44 Revolution speed prediction calculation unit 45 Revolution speed control means

Claims (9)

[Claims] 1. A heat pump in which a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant flow path, a heat storage tank heated and heated by the heat of the condenser, and heated by heat of a combustion burner. And a heat exchanger having a variable rotation speed. And a compressor for operating the compressor at a low rotation speed when the remaining hot water amount is large and at a high rotation speed when the remaining hot water amount is small. The water heater according to claim 1, further comprising a rotation speed control means. 3. The water heater according to claim 2, wherein the remaining hot water amount detecting means is provided with a plurality of temperature detecting sensors in a height direction of the heat storage tank. 4. A heat source enthalpy detecting means for detecting a heat source enthalpy of an evaporator, and a compressor for operating the compressor at a low rotation speed when the heat source enthalpy is high and at a high rotation speed when the heat source enthalpy is low by the heat source enthalpy detection means. The water heater according to claim 1, further comprising a rotation speed control means. 5. A remaining hot water amount detecting means for detecting a remaining hot water amount of the heat storage tank, a heat source enthalpy detecting means for detecting a heat source enthalpy of the evaporator, and a compression for setting a rotational speed of the compressor based on the remaining hot water amount and a heat source enthalpy value. 2. The water heater according to claim 1, further comprising a machine speed control means. 6. The water heater according to claim 1, further comprising a clock, and a compressor rotation speed control means for setting the rotation speed of the compressor for each time zone by the clock. 7. A storage unit for storing the remaining hot water pattern of the heat storage tank for several days, a calculating unit for predicting and calculating the compressor operating speed based on the remaining hot water pattern of the storage unit, 2. The water heater according to claim 1, further comprising a compressor speed control means for setting. 8. A water circulation channel which is guided from a lower part of the heat storage tank to a condenser via a circulation pump and returned to the upper part of the heat storage tank, an outlet hot water temperature detecting means for detecting a condenser hot water temperature,
2. The water heater according to claim 1, further comprising control means for adjusting the amount of circulating water so that the detected hot water temperature of the outlet hot water temperature detecting means becomes a predetermined temperature set in advance. 9. The water heater according to claim 8, wherein the amount of circulating water is adjusted by adjusting the number of revolutions of a circulating pump.