JP2000199645A - Heat pump water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize and uniformalize the hot water temperature of a storage hot water during reheating operation by a heat pump water heater. SOLUTION: This water heater comprises a hot water supply circuit consisting of a compressor 1, a refrigerant circuit having a refrigerant to water heat-exchanger 2, a hot water storage tank 5, a circulation pump 6; a hot water supply circuit from a heater 7, a first temperature detector 8; a second temperature detector 9; a hot water amount detector 10; a number of revolutions control means 11 to control the number of revolutions of the circulation pump 6 by means of a signal from the first temperature detector 8 while the heater 7 is not energized and a signal from the second temperature detector 9 while the heater 7 is energized; an operation memory device 12 to store whether the heater 7 is not electrically connected or electrically connected right before; and an operation controller 13. When it is detected by the hot water amount detector 10 that temperature is below a given value, the compressor 1 and the circulation pump 6 are operated. When it is stored by the operation memory device 12 that the heater is not electrically energized, the heater 7 is brought into non-electrical connection and when electrical connection is stored, electrical connection to the heater 7 is executed.

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.

[0002]

2. Description of the Related Art Conventionally, there is a water heater using a heat pump as disclosed in Japanese Patent Publication No. 62-22380. In FIG. 8, a compressor 1, a condenser 2 comprising a refrigerant-to-water heat exchanger, a pressure reducing device 3, and an evaporator 4 are sequentially connected in a ring shape, and a hot water temperature detector is provided between the condenser 2 and the auxiliary heater 10. 1
3 is provided, when the outlet water temperature of the condenser 2 is used in combination with the heat pump operation and the auxiliary heater 10, the circulating water amount is controlled so that the temperature of the circulating water is lower than that in the single operation of the heat pump. It guarantees the heating capacity and prevents the coefficient of performance of the heat pump from decreasing. In FIG. 8, 7 is a hot water storage tank, and 9 is a circulation pump.

[0003]

However, since the heat pump heats using atmospheric heat, the heating capacity varies depending on the outside air temperature. That is, the amount of circulating water naturally fluctuates in order to keep the outlet temperature of the condenser 2 constant. Therefore, even if the outlet temperature of the condenser 2 is controlled to be constant by the hot water temperature detector 13, the outlet water temperature of the auxiliary heater 10 fluctuates when the heat pump and the auxiliary heater 10 are operated in combination. Hot water cannot be stored in hot water storage tank 7.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected. A hot water tank for discharging hot water, a circulation pump connected to the lower part of the hot water tank, the refrigerant-water heat exchanger, a hot water supply circuit sequentially connected to a heater connected to the upper part of the hot water tank, and the refrigerant pair of the hot water supply circuit A first temperature detector for detecting the temperature of the hot water at the outlet of the water heat exchanger; a second temperature detector for detecting the temperature of the hot water at the outlet of the heater in the hot water supply circuit; and detecting the temperature of the hot water in the hot water storage tank The amount of hot water to be detected and the number of rotations of the circulating pump controlled by the signal of the first temperature detector when the heater is not energized, and the signal of the second temperature detector when the heater is energized. Rotation speed control means for controlling the rotation speed of the circulation pump at An operation storage device for storing whether the compressor is non-energized or energized, and when the hot water detector detects a predetermined temperature or less, the compressor and the circulating pump are operated and the operation storage device stores non-energized. At the time, the heater is de-energized, and when the energization is stored, an operation controller for energizing the heater is provided.

In order to save energy by reducing wasteful boiling during reheating operation, a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected; A hot water supply circuit in which a circulation pump, the refrigerant-to-water heat exchanger, and a heater are sequentially connected; a first temperature detector for detecting a hot water temperature at an outlet of the refrigerant-to-water heat exchanger of the hot water supply circuit; and the hot water supply circuit A second temperature detector for detecting a hot water temperature at the outlet of the heater, a hot water amount detector for detecting a hot water temperature in the hot water storage tank, and a first temperature detector when the heater is not energized. A rotation speed control means for controlling the rotation speed of the circulation pump with a signal, and controlling the rotation speed of the circulation pump with a signal from the second temperature detector when the heater is energized; and a refrigerant at the evaporator inlet. An evaporating temperature detector for detecting a temperature, and the A timer for starting the Upon detection time measurement, the evaporation temperature detector and timer setting means for performing the time setting of the timer signal, the hot water detector the compressor and detects the predetermined temperature or less, the circulation pump,
The compressor, the circulating pump, and an operation controller for stopping the operation of the heater upon receiving a signal indicating that the set time of the timer has ended, by energizing the heater, and operating the evaporator inlet. The setting time of the timer is set to be longer as the temperature of the timer becomes lower.

In order to satisfy the hot water supply load and save energy when the water temperature flowing into the refrigerant-to-water heat exchanger is high, a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected. A refrigerant circulation circuit, a hot water tank, a circulation pump, the refrigerant-to-water heat exchanger, a hot water supply circuit in which heaters connected to the upper part of the hot water tank are sequentially connected, and a refrigerant-to-water heat exchanger outlet of the hot water supply circuit. A first temperature detector for detecting hot water temperature, a second temperature detector for detecting hot water temperature at the outlet of the heater in the hot water supply circuit, and a hot water amount detector for detecting hot water temperature in the hot water storage tank; When the heater is not energized, the first
Rotation speed control means for controlling the rotation speed of the circulation pump with a signal from the temperature detector, and controlling the rotation speed of the circulation pump with a signal from the second temperature detector when the heater is energized; A third temperature detector for detecting a water temperature at the inlet of the refrigerant / water heat exchanger of the hot water supply circuit, and a temperature of the hot water in the hot water storage tank from a signal of the hot water amount detector and a signal of the third temperature detector When the temperature difference between the coolant and the water at the inlet of the water heat exchanger is larger than a set value, the compressor and the circulation pump are started to operate and the heater is de-energized, and the temperature difference is equal to or less than a set value. In this case, an operation controller for starting operation of the circulation pump and energizing the heater is provided.

Further, in order to improve the rise of hot water temperature at the start of operation, a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, a hot water tank, a circulation pump, A hot water supply circuit in which a refrigerant-to-water heat exchanger and a heater are sequentially connected; a first temperature detector for detecting a hot water temperature at an outlet of the refrigerant-to-water heat exchanger of the hot water supply circuit; and a heater for the hot water supply circuit A second temperature detector for detecting the temperature of the hot water at the outlet, and when the heater is not energized, controls the rotation speed of the circulating pump with a signal from the first temperature detector. Rotation speed control means for controlling the rotation speed of the circulating pump with the signal of the second temperature detector, and operation for controlling the energization of the heater at the start of operation, and then delaying the energization of the heater after a delay. And a controller.

[0008] Further, in order to prevent the abnormal pressure rise of the compressor at the start of operation and improve the durability, a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected; A hot water supply circuit in which a hot water storage tank, a circulation pump, and the refrigerant-to-water heat exchanger are sequentially connected; a first signal indicating a hot water temperature set temperature by detecting a hot water temperature at an outlet of the refrigerant-to-water heat exchanger of the hot water supply circuit; A temperature detector that generates a second signal that is a set temperature of the hot water temperature lower than one signal, and a rotation that controls the number of rotations of the circulation pump so as to set the hot water temperature that is the first signal of the temperature detector. Means for controlling the number of revolutions of the circulating pump so as to set a hot water temperature which is a second signal of the temperature detector at the start of operation, and thereafter, a hot water temperature setting which is a first signal of the temperature detector For controlling the rotation speed of the circulation pump so that A configuration in which a control unit.

[0009] In order to save energy in the equipment by the amount of boiling heat corresponding to the hot water supply load, a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected; A hot water supply circuit in which a pump, the refrigerant-to-water heat exchanger, and a heater are sequentially connected; a first temperature detector for detecting a hot water temperature at an outlet of the refrigerant-to-water heat exchanger of the hot water supply circuit; A second temperature detector for detecting the temperature of the hot water at the outlet of the heater, and when the heater is not energized, controls the rotation speed of the circulation pump with a signal from the first temperature detector,
When the heater is energized, a rotation speed control unit that controls the rotation speed of the circulation pump with a signal from the second temperature detector, and an evaporation temperature detector that detects a refrigerant temperature at the evaporator inlet,
An operation controller is configured to supply an electric current to the heater when the signal of the evaporation temperature detector becomes lower than a predetermined temperature.

[0010] Further, in order to save energy of the equipment in winter, a compressor, a refrigerant-water heat exchanger, a pressure reducing device,
A refrigerant circuit in which evaporators are sequentially connected, a hot water tank, a circulation pump, the refrigerant-to-water heat exchanger, a hot-water supply circuit in which heaters are sequentially connected, and a hot water temperature of the refrigerant-to-water heat exchanger outlet of the hot-water supply circuit. A first temperature detector for detecting the temperature of the hot water, a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit, and a signal of the first temperature detector when the heater is not energized. A rotation speed control means for controlling the rotation speed of the circulation pump, and controlling the rotation speed of the circulation pump with a signal from the second temperature detector when the heater is energized; and a refrigerant temperature at the inlet of the evaporator. And a refrigerant flowing to the bypass pipe side while being provided in a bypass pipe connecting the suction pipe of the compressor and the outlet pipe of the refrigerant-to-water heat exchanger of the refrigerant circulation circuit to reduce the pressure of the refrigerant. Flow control means for setting the flow rate of the When the signal of the evaporation temperature detector is higher than a predetermined temperature, the heater is de-energized and the on-off valve is opened, and when the signal of the evaporation temperature detector is lower than the predetermined temperature, An operation controller for energizing the heater and closing the on-off valve is provided.

[0011]

(1) According to the first configuration, when the heater is not energized, the rotation speed control means controls the first temperature so that the outlet temperature of the refrigerant-water heat exchanger becomes a predetermined temperature. The number of revolutions of the circulation pump is controlled by a first signal of a detector, and the hot water is stored in an upper portion of the hot water storage tank. Then, when the compressor and the heater are operated in combination, the rotation speed control means uses the signal of the second temperature detector so that the outlet temperature of the heater becomes a predetermined temperature. The number of rotations of the circulation pump is controlled to store hot water in the upper part of the hot water storage tank. Here, when hot water is discharged from the hot water storage tank, water is supplied from the lower part of the hot water storage tank, and the remaining hot water rises to the upper part. When the supplied water reaches the position of the hot water detector and detects a predetermined temperature or less, the hot water detector sends a signal to the operation controller to store whether the heater immediately before was non-energized or energized. In response to a signal from an operation storage device, it is determined whether the compressor is operated alone or the compressor and the heater are operated in combination, and the compressor and the circulation pump are operated and the heater is energized or deenergized. And start the reheating operation. At this time, the rotation speed control means controls the rotation speed of the circulation pump so that the temperature of the hot water is set to the first temperature detector when the heater is not energized and the compressor is operated alone. Then, the water sent from the lower part of the hot water tank is heated and flows into the upper part of the hot water tank. Further, when the heater is energized and is operated in combination with the compressor, the number of rotations of the circulating pump is controlled so that the hot water temperature of the second temperature detector is set, and the hot water storage tank is controlled. The water sent from the lower part of the tank is heated and flows into the upper part of the hot water storage tank. Therefore, the temperature of the hot water during the additional heating operation is stored at the same temperature as the remaining hot water, so that the temperature of the hot water in the hot water storage tank becomes uniform, and a stable hot water temperature can be obtained when the hot water is discharged.

(2) According to the second configuration, when the water discharged from the hot water tank and supplied from the lower part of the hot water tank reaches the hot water detector and detects a temperature equal to or lower than a predetermined temperature, the operation controller determines Send a signal for reheating operation. At this time, when the signal from the evaporating temperature detector is received and the evaporating temperature is low, the timer setting means extends the set time of the timer to perform the additional heating operation. Conversely, when the evaporation temperature is high, the set time of the timer is shortened. Therefore, in winter and the like, the heating capacity per unit time is small because the evaporation temperature is low even though the hot water supply load is large. For this reason, the reheating operation time is lengthened, and the amount of reheating water is increased to prevent running out of hot water. If the heating capacity is high due to the high evaporation temperature despite the low hot water supply load during the middle to summer seasons, the additional heating time is shortened and the additional hot water volume is reduced, resulting in unnecessary boiling. And reduce energy consumption.

(3) According to the third configuration, when the equipment has not been used for several days, the entire inside of the hot water tank becomes medium-temperature water by heat transfer by heat radiation and mixing of hot and cold water, and the medium-temperature water exchanges heat between the refrigerant and water. When it flows into the compressor, the high pressure of the compressor rises abnormally, so it cannot be heated by the heat pump compressor.
The hot water supply load cannot be satisfied. For this reason, heating is performed by another heat source such as a heater, but in this case, energy saving is not achieved. Also, in normal boiling,
Immediately before the end of boiling, when the medium-temperature water of the hot-water mixed layer in which the hot water is mixed in the hot water tank flows into the refrigerant-to-water heat exchanger, the high pressure of the compressor abnormally rises and the heat pump cannot be heated by the heat pump compressor. . Therefore, in order to easily determine the temperature of the hot water in the hot water tank and save energy and satisfy the hot water supply load, at the start of operation, the hot water temperature at the position of the hot water detector and the water temperature detected by the third temperature detector are determined. When the temperature difference is detected and is larger than the set value, the compressor is operated independently, the rotation speed of the circulation pump is controlled by the first signal of the first temperature detector, and the boiling operation is performed. do. And
If the temperature of the hot water at the outlet of the refrigerant / water heat exchanger rises above a set value during operation, it is determined that high-temperature hot water in the mixed layer in the hot water tank has flowed into the refrigerant / water heat exchanger, and the operation controller Stops the compressor. Therefore, the operation becomes highly efficient without performing the heater alone operation, and energy saving is achieved. On the other hand, when the difference between the hot water temperature at the position of the hot water detector and the water temperature detected by the third temperature detector at the start of operation is equal to or less than a set value, the entire inside of the hot water storage tank is determined to be medium-low temperature water, The operation controller stops the compressor, performs a boiling operation on the heater alone, and rotates the circulation pump so that the hot water temperature detected by the second temperature detector matches the hot water set temperature. Control and perform boiling operation. Therefore, it becomes possible to boil to the lower part of the hot water storage tank at a hot water temperature that can be used as hot water supply. Therefore, even if the hot water is urgently needed in the long-term unused state, the hot water supply load and the hot water temperature can be sufficiently satisfied. Further, there are no problems such as abnormal pressure rise on the high pressure side of the compressor and abnormal temperature rise.

(4) According to the fourth configuration, the operation controller supplies electricity to the heater at the start of operation so that the hot water temperature detected by the second temperature detector matches the hot water set temperature. The number of revolutions of the circulating pump is controlled, and a boiling operation is performed. Then, after a delay, the heater is de-energized, and the rotation speed of the circulation pump is controlled so that the hot water temperature detected by the first temperature detector matches the hot water set temperature. Therefore, the operation controller supplies electricity to the heater at the start of operation, so that the predetermined hot water temperature is quickly reached.

(5) According to the fifth configuration, the operation controller is the second temperature which is the hot water set temperature of the temperature detector which detects the temperature of the refrigerant in the hot water supply circuit at the outlet of the water heat exchanger at the start of operation.
The rotation speed control of the circulation pump is performed so as to match the signal, and thereafter, the rotation speed control of the circulation pump is controlled so that the hot water temperature detected by the temperature detector matches the first signal which is the hot water set temperature. Do. Therefore, since the temperature is raised at a lower hot water temperature setting at the time of startup, the pressure and discharge temperature of the compressor are not abnormally increased at the start of operation, and the durability is improved.

(6) According to the sixth configuration, the energization of the heater is selected by the signal of the evaporating temperature detector. If the detected evaporating temperature is higher than a predetermined temperature, the heating capability of the heat pump is large. The heater is operated without current. On the other hand, when the detected evaporation temperature is lower than the predetermined temperature, the heater is energized and operated in response to the signal from the evaporation temperature detector. When the heater is de-energized, the rotation speed control means receives a signal from the first temperature detector so that the hot water temperature at the outlet of the refrigerant-to-water heat exchanger matches the set temperature. The number of revolutions of the circulation pump is controlled, and hot water is stored from above the hot water storage tank. In addition, when the heater is energized and the compressor is operated in combination with the compressor, the rotation speed control means receives a signal from the second temperature detector so that the hot water temperature at the heater outlet matches the set temperature. The number of rotations of the circulating pump is controlled to store hot water at a higher temperature than when no power is supplied from the upper part of the hot water storage tank. Therefore, it is possible to operate with an efficient heat pump from the middle season when the hot water supply load is small to the summer season. On the other hand, when the hot water supply load in winter is large, the amount of stored hot water increases because the compressor and the heater are operated in combination, and the load can be satisfied. Further, since the temperature is controlled at the heat source outlet during any operation, hot water having a stable temperature is stored in the hot water storage tank.

(7) According to the seventh configuration, the energization of the heater is selected by a signal from the evaporating temperature detector for detecting the temperature at the evaporator inlet, and the detected evaporating temperature is higher than a predetermined temperature. Turns off the heater, and if low, turns on the heater. At that time, when the heater is energized and operated in combination with the compressor, the flow rate of the refrigerant to water heat exchanger increases because the heating capacity is large, and the discharge pressure and discharge temperature of the compressor are reduced. It is lower than when the heater is not energized. Therefore, the temperature of the refrigerant flowing into the refrigerant-to-water heat exchanger becomes low, so that the efficiency of heat exchange with water decreases. However, in this configuration, the operation controller closes the on-off valve when the heater is energized. Therefore, the liquid refrigerant in the bypass from the refrigerant-to-water heat exchanger to the compressor stops flowing, the discharge temperature of the compressor rises, and the water is efficiently heated to a high temperature by the refrigerant-to-water heat exchanger. Can be.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 1 is a compressor, 2 is a refrigerant-water heat exchanger constituting a condenser in a refrigerant circuit, 3 is a decompression device, and 4 is an evaporator. The water heat exchanger 2, the pressure reducing device 3, and the evaporator 4 are sequentially connected to form a refrigerant circuit. Reference numeral 5 denotes a hot water storage tank, which supplies water from a lower part and discharges water from an upper part. Reference numeral 6 denotes a circulation pump, which is connected to the lower part of the hot water storage tank 5. Reference numeral 7 denotes a heater provided with an electric heater, which is connected to an upper portion of the hot water storage tank 5, and the hot water storage tank 5, the circulation pump 6, the refrigerant-to-water heat exchanger 2, and the heater 7 are sequentially connected. Construct a hot water supply circuit. Reference numeral 8 denotes a first temperature detector, which is provided in the hot water supply circuit, detects the temperature of the hot water at the outlet of the refrigerant-to-water heat exchanger 2, and sets the detected hot water temperature and the first set temperature of the hot water here. Send a signal. Reference numeral 9 denotes a second temperature detector, which is provided in the hot water supply circuit, detects the hot water temperature at the outlet of the heater 7, and transmits the detected hot water temperature and the set hot water temperature. Reference numeral 10 denotes a hot water level detector which detects the temperature of hot water in the hot water storage tank 5. Reference numeral 11 denotes a rotation speed control means. When the heater 7 is not energized, the circulation pump 6 is controlled so that the hot water temperature detected by the first temperature detector 8 matches the hot water set temperature.
Of the circulating pump 6 is controlled so that the hot water temperature detected by the second temperature detector 9 matches the hot water set temperature during energization. Reference numeral 12 denotes an operation storage device, which stores whether or not the heater 7 was operated immediately before or after the heater 7 was de-energized. An operation controller 13 operates the compressor 1 and the circulating pump 6 in response to a signal from the hot water detector 10 and operates the operation storage device 12.
, The heater 7 is energized or de-energized.

In the above configuration, the case where the heater 7 is not energized first will be described. The high-temperature gas refrigerant discharged from the compressor 1 flows into the refrigerant-to-water heat exchanger 2, where it heats water by a condensing action. Then, the condensed and liquefied refrigerant is depressurized by the decompression device 3 and flows into the evaporator 4. Then, it absorbs atmospheric heat to evaporate and return to the compressor 1. On the other hand, the water flowing out from the lower part of the hot water storage tank 5 flows into the refrigerant-to-water heat exchanger 2 via the circulation pump 6, is heated by the heat of condensation of the refrigerant, and is stored from the upper part of the hot water storage tank 5. Here, the first temperature detector 8 detects the outlet temperature of the refrigerant-to-water heat exchanger 2 and sends a signal to the rotation speed control means 10 so that the circulation temperature is adjusted so that the outlet hot water temperature becomes the set temperature. The rotation speed of the pump 6 is controlled. Next, the combined operation of the compressor 1 and the heater 7 will be described. In this case, the water heated by the refrigerant / water heat exchanger 2 is further heated to a high temperature by the heater 7. Then, upon receiving a signal from the second temperature detector 9 so that the outlet temperature of the heater 7 becomes the set temperature, the rotation speed control means 10 controls the rotation speed of the circulation pump 6, and the hot water storage tank Stored from the top of 5.

When the hot water is discharged from the hot water storage tank 5,
Low-temperature water is supplied from the lower part of the hot water storage tank 1, and the hot water layer rises to the upper part. The supplied water is supplied to the hot water detector 10.
Is reached, the hot water detector 10 detects it and sends a signal to the operation controller 13. Therefore, the operation controller 13 receives the signal of the operation storage device 12, and determines whether the heater 7 was de-energized or energized immediately before,
Start the reheating operation. First, a case in which the heater 7 is operated without power supply immediately before the reheating operation will be described. In this case, the compressor 1 and the circulation pump 6 are energized to control the rotation speed of the circulation pump 6 so that the hot water temperature detected by the first temperature detector 8 becomes the set temperature. The water sent from the lower part of the hot water storage tank 5 is heated through the refrigerant / water heat exchanger 2 and flows into the upper part of the hot water storage tank 5. On the other hand, when the heater 7 is energized and operated immediately before the reheating operation, the compressor 1, the circulation pump 6, and the heater 7 are energized to start the reheating operation, and the hot water storage tank is started. After the water sent from the lower part of 5 is heated by the refrigerant-to-water heat exchanger 2, the water is further heated at a high temperature by the heater 7. At this time, the rotation speed of the circulation pump 6 is controlled so that the detected hot water temperature of the second temperature detector 9 matches the set temperature, and hot water heated at a high temperature flows into the upper part of the hot water storage tank 5. Therefore, the temperature of the hot water in the additional heating operation is stored at the same temperature as the remaining hot water, so that the temperature of the hot water in the hot water storage tank 5 becomes uniform, and a stable hot water temperature can be obtained when the hot water is discharged.

Next, a second embodiment will be described.
In FIG. 2, components having the same configuration and operation as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 14 denotes an evaporating temperature detector which detects the refrigerant temperature at the inlet of the evaporator 4. Reference numeral 15 denotes a timer, which starts measuring time in response to a signal from the hot water level detector 10. Reference numeral 16 denotes timer setting means for setting a set time of the timer 15 in response to a signal from the evaporating temperature detector 14, and when the signal from the evaporating temperature detector 14 represents a signal lower than a predetermined temperature. To increase the setting time of the timer 15,
Conversely, when representing a high-temperature signal, it is set short. 1
Reference numeral 7 denotes an operation controller which starts the operation of the compressor 1, the circulating pump 6, and the heater 7 in response to a signal from the hot water detector 10, and receives a signal indicating that the set time of the timer 15 has ended. The compressor 1, the circulation pump 6,
The operation of the heater 7 is stopped.

In the above configuration, when the water supplied from the hot water storage tank 5 and supplied reaches the position of the hot water detector 10, the operation controller 17 controls the compressor 1, the circulation pump 6, or the heater. 7 is energized, and the reheating operation is started. Then, the timer 15 starts measuring time by a signal from the hot water detector 10. At this time, when the signal from the evaporating temperature detector 14 is received and the evaporating temperature is lower than a predetermined temperature, the timer setting means 16 lengthens the time setting of the timer 15 and conversely, when the evaporating temperature is high. Reduces the time setting of the timer 15 and continues the reheating operation until a predetermined time is reached. Therefore, when the remaining hot water decreases, the reheating capacity is low because the evaporation temperature is low even though the water supply temperature is low and the hot water supply load is large in winter. For this reason, it is possible to prolong the reheating operation time and increase the amount of reheating water to prevent running out of hot water. On the other hand, if the heating capacity is large due to the high evaporation temperature despite the low hot water supply load during the middle and summer seasons, the reheating operation time is shortened, the amount of reheating water is reduced, and unnecessary reheating operation is performed. And energy can be saved.

Next, a third embodiment will be described.
In FIG. 3, components having the same configurations and operations as those of the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted. 18
Is a third temperature detector, which is provided in the hot water supply circuit,
The water temperature at the inlet of the refrigerant-to-water heat exchanger 2 is detected and transmitted when the temperature reaches a predetermined temperature. Reference numeral 19 denotes an operation controller which receives a signal from the hot water detector 10 and a signal from the third temperature detector 18 and receives the temperature of the hot water in the hot water storage tank 5 and the refrigerant-to-water heat exchanger 2.
When the temperature difference of the inlet water temperature is larger than the set value, the operation of the compressor 1 and the circulation pump 6 is started, and when the temperature difference is smaller than the set value from both signals, the circulation pump 6 and the heater Drive 7

In the above configuration, the operation controller 19 receives signals from the hot water level detector 10 and the third temperature detector 18 at the start of operation, and receives the temperature of the hot water in the hot water tank 5 and the temperature of the refrigerant / water heat exchanger 2. The compressor 1, the circulating pump 6, and the heater 7 are controlled from the temperature difference of the inlet water temperature. First, a case where the temperature difference is larger than a set value upon receiving signals from the hot water detector 10 and the third temperature detector 18 will be described. In this case, the compressor 1 is operated independently, and the number of revolutions of the circulation pump 6 is controlled by the signal of the first temperature detector 8 to perform the boiling operation. Therefore, since the heater 7 is not operated, the operation is performed with high efficiency, and energy is saved. Next, a case where the temperature difference is equal to or less than a set value upon receiving signals from the hot water detector 10 and the third temperature detector 18 will be described. In this case,
It is determined that the low-temperature water that cannot be boiled by the operation of the compressor 1 is stored in the entire hot water storage tank 5, and the operation controller 19 stops the compressor 1 at the start of the operation, and stops the heating. The heating operation is performed by the unit 7 alone, and the rotation speed of the circulation pump 6 is controlled so that the detected hot water temperature becomes the set temperature by the signal of the second temperature detector 9. Therefore, the temperature can be raised to the temperature of hot water that can be used as hot water supply and stored in the hot water storage tank 5. Therefore, even if hot water is needed urgently for a long time,
The hot water supply load and the hot water temperature can be sufficiently satisfied. Further, the problems of high pressure and temperature rise of the compressor 1 are eliminated.

Next, a fourth embodiment will be described.
In FIG. 4, the same configuration as the first, second, and third embodiments,
The same reference numerals are used for those that operate, and the description is omitted. Reference numeral 20 denotes an operation controller, which controls the energization of the heater 7 at the start of operation, and then controls the non-energization of the heater 7 after a delay.

In the above configuration, the operation controller 20 energizes the heater 7 at the start of operation, and controls the circulation pump 6 so that the temperature of the hot water detected by the signal of the second temperature detector 9 becomes the set temperature. Performs rotation speed control. Then, after a delay, the heater 7 is de-energized, and the rotation speed control of the circulation pump 6 is performed so that the detected hot water temperature becomes the set temperature by the signal of the first temperature detector 8. Therefore, at the start of the operation, the heater 7 is energized, so that the temperature of the hot water reaches the predetermined temperature quickly.

Next, a fifth embodiment will be described.
In FIG. 5, the same components as those of the first, second, third, and fourth embodiments are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 21 denotes a temperature detector, which is provided in the hot water supply circuit, detects the temperature of the hot water at the outlet of the refrigerant-to-water heat exchanger 2, and outputs a first signal as a hot water temperature setting temperature and a second signal lower than the first signal. Generate a signal. 22 is a rotation speed control means,
The rotation speed of the circulation pump 6 is controlled such that the hot water temperature detected by the temperature detector 21 matches the first signal of the hot water set temperature. An operation controller 23 controls the rotation speed of the circulation pump 6 such that the temperature of the hot water detected by the temperature detector 21 and the second signal of the hot water set temperature coincide with each other at the start of operation.

In the above configuration, the operation controller 23 controls the circulation pump 6 so that the hot water temperature detected by the temperature detector 21 and the second signal of the hot water set temperature coincide with each other at the start of operation.
Is controlled so that the hot water temperature detected by the temperature detector 21 matches the first signal of the hot water set temperature, and the rotation speed control means 22
Is performed. Accordingly, since the temperature of the boiling water is set low at the time of startup, the pressure and the discharge temperature of the compressor 1 do not rise abnormally, and the durability is improved.

Next, a sixth embodiment will be described.
In FIG. 6, components having the same configurations and operations as those of the first, second, third, fourth, and fifth embodiments are denoted by the same reference numerals, and description thereof is omitted. An operation controller 24 energizes the heater 7 when a signal from the evaporation temperature detector 14 detects a temperature lower than a predetermined temperature.

In the above configuration, the evaporating temperature detector 1
The energization of the heater 7 is selected by the signal of 4, and when the evaporating temperature is high, the heating capacity of the heat pump is large, so that the heater 7 is de-energized, and when the evaporation temperature is low, the heater 7 is energized. When the heater 7 is not energized, the rotation speed control unit 11 controls the rotation speed of the refrigerant to water heat exchanger 2 at the first position.
The rotation speed of the circulation pump 6 is controlled so that the temperature of the hot water detected by the temperature detector 8 matches the set temperature, and hot water is stored from above the hot water storage tank 5. In addition, the heater 7
Is energized and the compressor 1 is operated in combination with the compressor 1 so that the rotation speed control means 11 performs the circulation so that the hot water temperature detected by the second temperature detector 9 at the outlet of the heater 7 matches the set temperature. The number of rotations of the pump 6 is controlled, and hot water that is hotter than when no power is supplied is stored from above the hot water storage tank 5. Therefore, the operation can be performed with an efficient heat pump from the middle season to the summer season when the hot water supply load is small. On the other hand, when the load of hot water supply in winter is large, a high temperature is obtained because the compressor 1 and the heater 7 are operated in combination, so that the amount of stored hot water increases and the load can be satisfied. In any operation, since the temperature is controlled at the heat source outlet, hot water having a stable temperature is stored in the hot water storage tank.

Next, a seventh embodiment will be described.
In FIG. 7, the same components as those of the first, second, third, fourth, fifth, and sixth embodiments are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 25 denotes an on-off valve, which is provided on a bypass pipe 26 connecting the suction pipe of the compressor 1 and the outlet pipe of the refrigerant-to-water heat exchanger 2 together with a flow rate adjusting means 27 for reducing the pressure of the refrigerant. Reference numeral 28 denotes an operation controller, which controls the heater 7 in response to a signal from the evaporating temperature detector 14 to close the on-off valve 25.

In the above configuration, the evaporating temperature detector 1
The energization of the heater 7 is selected by the signal of 4, and when the evaporation temperature is high, the heater 7 is de-energized, and when the evaporation temperature is low, the heater 7 is energized. At this time, when the heater 7 is energized and the compressor 1 is operated in combination, the flow rate of the refrigerant-water heat exchanger 2 increases because the heating capacity is large,
The discharge pressure and discharge temperature of the compressor 1
Is lower than when no current is supplied. Therefore, the temperature of the refrigerant flowing into the refrigerant-to-water heat exchanger 2 becomes low, and the efficiency is lowered. However, in this embodiment, the operation controller 28 closes the on-off valve 25 when the heater 7 is energized. Therefore, the liquid refrigerant in the bypass from the refrigerant-to-water heat exchanger 2 to the compressor 1 stops flowing, the discharge temperature of the compressor 1 rises, and the refrigerant-to-water heat exchanger 2 efficiently supplies water to a high temperature. Can be heated.

[0034]

As described above, the heat pump water heater according to the present invention has a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, and water is supplied from a lower portion and discharged from an upper portion. A hot water storage tank, a circulation pump connected to the lower part of the hot water storage tank, a refrigerant / water heat exchanger, a hot water supply circuit sequentially connected to a heater connected to the upper part of the hot water storage tank, and the refrigerant / water of the hot water supply circuit. A first temperature detector for detecting a hot water temperature at a heat exchanger outlet, a second temperature detector for detecting a hot water temperature at the heater outlet of the hot water supply circuit, and detecting a hot water temperature in the hot water storage tank When the heater is not energized, the number of rotations of the circulation pump is controlled by the signal of the first temperature detector when the heater is not energized, and when the heater is energized, the signal is supplied by the signal of the second temperature detector. Rotation speed control means for controlling the rotation speed of the circulation pump; An operation storage device that stores whether the heater is non-energized or energized, and the operation storage device stores the non-energization while operating the compressor and the circulation pump when the hot water detector detects a predetermined temperature or less. When the power is on, the heater is de-energized, and when the energization is stored, an operation controller for energizing the heater is provided, so that the water supplied from the hot water storage tank and supplied reaches the hot water level detector. Then, a signal is sent to the operation controller, and it is determined whether the compressor is operated alone or the compressor and the heater are operated in combination with a signal of an operation storage device that stores the immediately preceding operation, and a reheating operation is performed. To start. At this time, the rotation speed control means controls the rotation speed of the circulation pump with a signal of the first temperature detector when the heater is not energized and the compressor operates alone, and the heating device In the case of energization and simultaneous operation with the compressor, the rotation speed of the circulation pump is controlled by the signal of the second temperature detector. Therefore, the temperature of the hot water during the additional heating operation is the same as the temperature of the remaining hot water, so that a stable hot water temperature can be obtained when the hot water is discharged.

Also, a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, and a hot water supply in which a hot water storage tank, a circulation pump, the refrigerant-to-water heat exchanger, and a heater are sequentially connected. A first temperature detector for detecting a temperature of the hot water at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit; and a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit. A hot water level detector for detecting the temperature of hot water in the hot water storage tank, and when the heater is not energized, controls the number of revolutions of the circulating pump with a signal from the first temperature detector. Means for controlling the number of revolutions of the circulating pump by a signal of the second temperature detector, an evaporating temperature detector for detecting a refrigerant temperature at the evaporator inlet, and the hot water quantity detector for detecting a predetermined temperature. A timer that starts measuring time when detected, and a signal from the evaporation temperature detector. Timer setting means for setting the time of the timer, and when the hot water detector detects a predetermined temperature or less, the compressor, the circulating pump, and the heater are energized to start the operation and to terminate the set time of the timer. The compressor, the circulating pump, an operation controller for stopping the operation of the heater in response to a signal, the set time of the timer is set longer as the temperature of the evaporator inlet becomes lower, When the hot water is discharged from the hot water storage tank and the supplied water reaches the hot water level detector, the operation controller sends a signal of a reheating operation. At this time, when the signal from the evaporating temperature detector is received and the evaporating temperature is low, the timer setting means extends the set time of the timer to perform the additional heating operation. Conversely, when the evaporation temperature is high, the reheating operation is performed by shortening the set time of the timer. Therefore, when the evaporating temperature is low, such as in winter, the reheating operation time becomes longer and the amount of reheating water increases, and when the evaporating temperature is high, such as in the middle to summer, the reheating time is shortened, and the amount of reheating water is reduced. In order to reduce energy consumption, energy can be saved.

A refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, a hot water tank, a circulation pump, the refrigerant-water heat exchanger, and an upper portion of the hot water tank are connected. A hot water supply circuit having heaters sequentially connected thereto, a first temperature detector for detecting a hot water temperature at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit, and a hot water temperature at the outlet of the heater in the hot water supply circuit. A second temperature detector for detecting the temperature of the hot water in the hot water storage tank; and a first temperature detector for detecting the temperature of the hot water in the hot water storage tank.
Rotation speed control means for controlling the rotation speed of the circulation pump with a signal from the temperature detector, and controlling the rotation speed of the circulation pump with a signal from the second temperature detector when the heater is energized; A third temperature detector for detecting a water temperature at the inlet of the refrigerant-water heat exchanger of the hot water supply circuit; and a temperature of the hot water in the hot water storage tank based on a signal of the hot water amount detector and a signal of the third temperature detector. When the temperature difference between the coolant and the water at the inlet of the water heat exchanger is larger than a set value, the compressor and the circulation pump are started to operate and the heater is de-energized, and the temperature difference is equal to or less than a set value. An operation controller for starting operation of the circulation pump and energizing the heater, wherein the hot water tank temperature and the refrigerant are obtained from signals of the hot water detector and the third temperature detector at the start of operation. Temperature difference between inlet water temperature and water heat exchanger is larger than set value If performed alone operation by the compressor performs rotational speed control of the circulation pump in the signal of the first temperature detector, for heating operation. Therefore, the operation becomes highly efficient without performing the heater alone operation, and energy saving is achieved. On the other hand, if the temperature difference between the hot water tank hot water temperature and the coolant-to-water heat exchanger inlet water temperature is less than or equal to the set value based on the signals from the hot water quantity detector and the third temperature detector, the entire inside of the hot water tank is medium. When it is determined that the temperature is low-temperature water, the operation controller stops the compressor, performs the boiling operation with the heater alone, and controls the rotation speed of the circulation pump based on the signal of the second temperature detector. Therefore, it is possible to boil the entire hot water to a lower temperature in the hot water storage tank at a temperature usable for hot water supply. Therefore, even if the hot water is urgently needed in the long-term unused state, the hot water supply load and the hot water temperature can be sufficiently satisfied. Further, there are no problems such as high pressure and temperature rise of the compressor.

Further, a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, and a hot water supply in which a hot water storage tank, a circulation pump, the refrigerant-to-water heat exchanger, and a heater are sequentially connected. A first temperature detector for detecting a temperature of the hot water at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit; and a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit. When the heater is not energized, the rotation speed of the circulating pump is controlled by the signal of the first temperature detector, and when the heater is energized, the rotation of the circulation pump is controlled by the signal of the second temperature detector. A rotation speed control means for controlling the rotation speed, an energization of the heater at the start of operation, an operation controller for performing a control to de-energize the heater with a delay after that, the operation controller at the start of operation The heater is energized, and the signal from the second temperature detector is used to turn on the circulation port. Perform the rotational speed control of flops. And
Then, after a delay, the heater is de-energized, and the rotation speed of the circulation pump is controlled by the signal of the first temperature detector. Therefore, when the operation is started, the heater is energized, so that the temperature of the hot water is quickly reached.

A refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected; a hot-water supply tank in which a hot-water tank, a circulation pump, and the refrigerant-water heat exchanger are sequentially connected; A temperature detector for detecting a hot water temperature at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit and generating a first signal which is a hot water set temperature and a second signal which is a hot water set temperature lower than the first signal. Rotation speed control means for controlling the rotation speed of the circulating pump so as to achieve a hot water temperature setting which is a first signal of the temperature detector; and a hot water temperature setting which is a second signal of the temperature detector at the start of operation. And an operation controller for controlling the rotation speed of the circulation pump so that the temperature of the hot water is set as the first signal of the temperature detector. The operation controller operates the second temperature detector at the start of operation. Wherein performs rotational speed control of the circulation pump, then the rotation speed control of the circulation pump is switched to the first signal of the temperature detector at issue. Therefore, the pressure and the discharge temperature of the compressor are not abnormally increased at the time of startup, and the durability is improved.

Further, a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, and a hot water supply tank, a circulation pump, a hot water supply in which the refrigerant-to-water heat exchanger, and a heater are sequentially connected. A first temperature detector for detecting a temperature of the hot water at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit; and a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit. When the heater is not energized, the rotation speed of the circulating pump is controlled by the signal of the first temperature detector, and when the heater is energized, the rotation of the circulation pump is controlled by the signal of the second temperature detector. Rotation speed control means for controlling a rotation speed, an evaporation temperature detector for detecting a refrigerant temperature at the evaporator inlet, and operation control for energizing the heater when a signal from the evaporation temperature detector becomes lower than a predetermined temperature. A heater, and a signal from the evaporating temperature detector to communicate with the heater. Select, if the evaporation temperature is high the heater is large heating capacity of the heat pump is de-energized, when low energizes the heater. And
When the heater is not energized, the operation controller controls the rotation speed of the circulating pump with a signal from a first temperature detector provided downstream of the refrigerant-to-water heat exchanger. Add hot water from the top of the pan. When the heater is energized and the compressor is operated in combination with the compressor, the operation controller controls the rotation speed of the circulation pump with a signal of a second temperature detector provided downstream of the heater, Hot water that is hotter than when no power is supplied is stored from above the hot water storage tank. Therefore, the operation can be performed with an efficient heat pump from the middle season to the summer season when the hot water supply load is small. On the other hand, when the hot water supply load in winter is large, the amount of stored hot water increases because the compressor and the heater are operated in combination, and the load can be satisfied. In any operation, since the temperature is controlled at the heat source outlet, hot water having a stable temperature is stored in the hot water storage tank.

Further, a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, and a hot water supply in which a storage tank, a circulation pump, the refrigerant-to-water heat exchanger, and a heater are sequentially connected. A first temperature detector for detecting a temperature of the hot water at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit; and a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit. When the heater is not energized, the rotation speed of the circulating pump is controlled by the signal of the first temperature detector, and when the heater is energized, the rotation of the circulation pump is controlled by the signal of the second temperature detector. Rotation speed control means for controlling the rotation speed, an evaporation temperature detector for detecting the refrigerant temperature at the inlet of the evaporator, a suction pipe of the compressor and an outlet pipe of the refrigerant-to-water heat exchanger of the refrigerant circulation circuit. Connected to the bypass pipe to reduce the pressure of the refrigerant and to the bypass pipe side Having a flow rate adjusting means for setting the flow rate of the refrigerant and an on-off valve, and when the signal of the evaporation temperature detector is higher than a predetermined temperature, de-energize the heater and open the on-off valve, When the signal of the evaporating temperature detector is lower than a predetermined temperature, an operation controller for energizing the heater and closing the on-off valve is provided, and the energizing of the heater is selected by the signal of the evaporating temperature detector. When the evaporation temperature is high, the heater is de-energized, and when the evaporation temperature is low, the heater is energized. At that time, when the heater is energized and operated in combination with the compressor, the flow rate of the refrigerant to water heat exchanger increases because the heating capacity is large, and the discharge pressure and discharge temperature of the compressor are reduced. It is lower than when the heater is not energized. Therefore, the temperature of the refrigerant flowing into the refrigerant-to-water heat exchanger becomes low, and the efficiency is reduced.
However, in the present invention, the operation controller energizes the heater and closes the on-off valve. Therefore, the liquid refrigerant in the bypass from the refrigerant-to-water heat exchanger to the compressor stops flowing, the discharge temperature of the compressor rises, and the water is efficiently heated to a high temperature by the refrigerant-to-water heat exchanger. Can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a heat pump water heater in Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram of a heat pump water heater in Embodiment 2 of the present invention.

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

FIG. 4 is a configuration diagram of a heat pump water heater according to a fourth embodiment of the present invention.

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

FIG. 6 is a configuration diagram of a heat pump water heater according to a sixth embodiment of the present invention.

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

FIG. 8 is a configuration diagram of a conventional heat pump water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Refrigerant-water heat exchanger 3 Decompression device 4 Evaporator 5 Hot water tank 6 Circulation pump 7 Heater 8 1st temperature detector 9 2nd temperature detector 10 Hot water amount detector 11 Revolution number control means 12 Operation Storage device 13 Operation controller 14 Evaporation temperature detector 15 Timer 16 Timer setting means 17 Operation controller 18 Third temperature detector 19 Operation controller 20 Operation controller 21 Temperature detector 22 Revolution control means 23 Operation controller 24 Operation controller 25 On-off valve 26 Bypass pipe 27 Flow rate adjusting means 28 Operation controller

Claims (7)

[Claims] 1. A refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, a hot water tank supplied with water from a lower part and a hot water discharged from an upper part, and connected to a lower part of the hot water tank. A hot water supply circuit in which a circulation pump, the refrigerant / water heat exchanger, and a heater connected to the upper part of the hot water storage tank are sequentially connected, and a first temperature detecting a hot water temperature at an outlet of the refrigerant / water heat exchanger of the hot water supply circuit. A temperature detector, a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit, a hot water detector for detecting the temperature of the hot water in the hot water storage tank, and when the heater is not energized, Rotation speed control means for controlling the rotation speed of the circulation pump by a signal of the first temperature detector, and controlling the rotation speed of the circulation pump by a signal of the second temperature detector when the heater is energized; And an operation storage device for storing whether the heater was de-energized or energized immediately before. When the hot water detector detects a predetermined temperature or less, the compressor and the circulating pump are operated and the heater is de-energized when the operation storage device stores the non-energization, and the energization is stored. A heat pump water heater comprising an operation controller for energizing the heater when the heater is turned on. 2. A refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, and a hot water supply in which a storage tank, a circulation pump, the refrigerant-to-water heat exchanger, and a heater are sequentially connected. A first temperature detector for detecting a temperature of the hot water at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit; and a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit. A hot water level detector for detecting the temperature of hot water in the hot water storage tank, and when the heater is not energized, controls the number of revolutions of the circulating pump with a signal from the first temperature detector. Means for controlling the number of revolutions of the circulating pump by a signal of the second temperature detector, an evaporating temperature detector for detecting a refrigerant temperature at the evaporator inlet, and the hot water quantity detector for detecting a predetermined temperature. A timer that starts measuring time when detected, and a signal from the evaporation temperature detector Timer setting means for setting the time of the immer, and when the hot water detector detects a predetermined temperature or less, the compressor, the circulating pump, and the heater are energized to start the operation and a signal for ending the set time of the timer. A heat pump water heater, comprising: an operation controller for stopping the operation of the compressor, the circulation pump, and the heater in response to the operation, and setting the timer to a longer time as the temperature at the evaporator inlet decreases. 3. A refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, a hot water tank, a circulation pump, the refrigerant-water heat exchanger, and an upper portion of the hot water tank. A hot water supply circuit having heaters sequentially connected thereto, a first temperature detector for detecting a hot water temperature at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit, and a hot water temperature at the outlet of the heater in the hot water supply circuit. A second temperature detector, a hot water amount detector for detecting the temperature of the hot water in the hot water storage tank, and a rotation speed of the circulation pump controlled by a signal of the first temperature detector when the heater is not energized. When the heater is energized, rotation speed control means for controlling the rotation speed of the circulating pump with a signal from the second temperature detector, and detecting the water temperature at the inlet of the refrigerant-water heat exchanger of the hot water supply circuit. A third temperature detector, a signal of the hot water level detector, and a signal of the third temperature detector When the temperature difference between the hot water temperature in the hot water storage tank and the water temperature at the inlet of the refrigerant / water heat exchanger is larger than a set value, the compressor and the circulation pump are started to operate and the heater is de-energized. When the temperature difference is equal to or less than a set value, the heat pump water heater includes an operation controller that starts operation of the circulation pump and energizes the heater. 4. A refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, and a hot water supply in which a storage tank, a circulation pump, the refrigerant-to-water heat exchanger, and a heater are sequentially connected. A first temperature detector for detecting a temperature of the hot water at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit; and a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit. When the heater is not energized, the rotation speed of the circulating pump is controlled by the signal of the first temperature detector, and when the heater is energized, the rotation of the circulation pump is controlled by the signal of the second temperature detector. A heat pump water heater comprising: rotation speed control means for controlling the rotation speed; and an operation controller for controlling the energization of the heater at the start of operation, and then the control of turning off the heater after a delay. 5. A refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a decompression device, and an evaporator are sequentially connected; a hot water tank, a circulation pump, and a hot-water supply circuit in which the refrigerant-to-water heat exchanger is sequentially connected;
A temperature detector for detecting a hot water temperature at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit and generating a first signal which is a hot water set temperature and a second signal which is a hot water set temperature lower than the first signal. Rotation speed control means for controlling the rotation speed of the circulating pump so as to achieve a hot water temperature setting which is a first signal of the temperature detector; and a hot water temperature setting which is a second signal of the temperature detector at the start of operation. An operation controller for controlling the rotation speed of the circulating pump so as to obtain the hot water temperature setting which is the first signal of the temperature detector. Water heater. 6. A refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, and a hot water supply in which a hot water storage tank, a circulation pump, the refrigerant-to-water heat exchanger, and a heater are sequentially connected. A first temperature detector for detecting a temperature of the hot water at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit; and a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit. When the heater is not energized, the rotation speed of the circulating pump is controlled by the signal of the first temperature detector, and when the heater is energized, the rotation of the circulation pump is controlled by the signal of the second temperature detector. Rotation speed control means for controlling a rotation speed, an evaporation temperature detector for detecting a refrigerant temperature at the evaporator inlet, and operation control for energizing the heater when a signal from the evaporation temperature detector becomes lower than a predetermined temperature. Heat pump water heater equipped with a water heater. 7. A refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device, and an evaporator are sequentially connected, and a hot water supply in which a hot water storage tank, a circulation pump, the refrigerant-to-water heat exchanger, and a heater are sequentially connected. A first temperature detector for detecting a temperature of the hot water at the outlet of the refrigerant / water heat exchanger of the hot water supply circuit; and a second temperature detector for detecting the temperature of the hot water at the outlet of the heater of the hot water supply circuit. When the heater is not energized, the rotation speed of the circulating pump is controlled by the signal of the first temperature detector, and when the heater is energized, the rotation of the circulation pump is controlled by the signal of the second temperature detector. Rotation speed control means for controlling the rotation speed, an evaporation temperature detector for detecting the refrigerant temperature at the inlet of the evaporator, a suction pipe of the compressor and an outlet pipe of the refrigerant-to-water heat exchanger of the refrigerant circulation circuit. Provided in the bypass pipe to be connected, depressurizes the refrigerant and flows to the bypass pipe side A flow control means for setting the flow rate of the medium and an on-off valve, wherein when the signal of the evaporation temperature detector is higher than a predetermined temperature, the heater is de-energized and the on-off valve is opened, A heat pump water heater comprising: an operation controller that energizes the heater and closes the on-off valve when a signal from the temperature detector is lower than a predetermined temperature.