JP2001221501A - Heat pump hot-water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the energy consumption of a heat pump hot-water supply system and to enable the system to quickly supply hot water, and then, to improve the capacity of the system and the service life and reliability of a heat source. SOLUTION: This hot-water supply system is provided with a heat pump circuit 5, a hot water storage tank 6 incorporating the heat source 7 in its upper part, and a water supply hot water heat exchanger 9 provided in the course of a hot water supply circuit 10 equipped with a circulating pump 8 that circulates the water in the lower part of the tank 6 to the upper part of the heat source 7. The system is also provided with a flow rate control means 11 which controls the circulating flow rate of the circuit 10, an intermediate temperature detecting means 12 which detects the temperature of the hot water at the outlet of the heat exchanger 9, and a control means 13 which controls the flow control means 11 so that the temperature detecting signal of the detecting means 12 may become coincident with a set temperature signal A. Therefore, the high-efficiency simultaneous operation of the heat source 7 can be realized and a hot water supply circuit system is reduced in heat radiating loss, improved in capacity, and enabled to promptly supply hot water. Moreover, the service life and reliability of the heat source 7 are improved against scale water and foul water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply system using a heat pump.

[0002]

2. Description of the Related Art Conventionally, this kind of heat pump has been disclosed in
There is one as shown in Japanese Patent Laid-Open No. 2-2380. Hereinafter, the related art will be described with reference to the drawings. FIG. 10 is a configuration diagram of a conventional heat pump hot water supply system. In FIG. 10, when the heat pump is operated by the compressor 1, the condenser 2
Then, the water in the hot water storage tank 6 is heated, and water with the same circulation flow rate is additionally heated by the auxiliary heater 7 and stored. During the combined operation of the heat pump operation and the auxiliary heater 7, the circulation flow rate is made larger than that of the single operation of the heat pump, and the temperature of the heated hot water at the outlet of the condenser 2 is lowered.

[0003]

However, in the conventional heat pump system, the temperature of heating by the heat pump during the combined operation of the heat pump and the auxiliary heater 7 is lower than the temperature of the heated hot water during the single operation of the heat pump. The amount of heat generated by using a heat pump is reduced. Therefore, since the heat pump having a higher efficiency than the efficiency of the auxiliary heater cannot be sufficiently utilized, the operation efficiency is reduced. Then, heat is radiated from the piping system until the hot water heated by the auxiliary heat source flows into the hot water storage tank. Further, since the auxiliary heater is provided in the water circulation circuit, the flow loss resistance increases, and the size of the circulation pump increases.

[0004] The present invention is to solve the above problems,
The main object of the present invention is to maximize the use of the heat pump operation and reduce the heat radiation loss from the piping system to achieve energy saving, high capacity, quick hot water, and low flow loss resistance.

[0005]

In order to solve the above problems, the present invention provides a compressor, a refrigerant hot water heat exchanger, a pressure reducing means,
A heat pump circuit comprising an evaporator that collects atmospheric heat or solar heat, a hot water storage tank with a built-in heat source at the top, and a refrigerant installed in the middle of the hot water supply circuit with a circulation pump that circulates water under the hot water tank to the top of the heat source A hot water supply heat exchanger having a heat exchange relationship with the hot water supply heat exchanger, a flow rate control means for controlling a circulation flow rate of the hot water supply circuit, an intermediate temperature detection means for detecting a hot water temperature at an outlet of the hot water supply heat exchanger, and an intermediate temperature A heat pump hot water supply system including a control unit that controls the flow rate control unit so that the temperature detection signal of the detection unit matches the set temperature signal A. With the above configuration, the set temperature can be raised by the operation of the heat pump circuit. When the temperature is set to a critical temperature, in operation by the heat pump circuit, the water at the bottom of the hot water storage tank To flow into the part. And the inflowing water is further heated to a high temperature by a heat source provided at the upper part of the hot water storage tank. Therefore, the water heated by the heat pump is immediately heated by using a heat source provided separately from the water circulation circuit heated by the heat pump circuit, so that the water can be heated to the set temperature even when the water source is operated simultaneously with the heat source.

Since a heat source for high-temperature heating is incorporated in the hot water storage tank, heat loss from the hot water supply circuit system is small. Therefore, high efficiency simultaneous heat source operation and high capacity can be realized. And since hot water can be stored in the upper part of a hot water storage tank in a short time, quick hot water can be achieved. Further, since the hot water supply circuit is not equipped with a heat source, low pressure loss, simplification, and space saving of the hot water supply circuit are achieved. In addition, since the heat source is built in the hot water storage tank, the heating density of the heat source can be reduced to lower the heating surface temperature. Therefore, a long life and high reliability of the heat source for scale water and corrosive water can be achieved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above problems, the invention according to claim 1 of the present invention comprises a compressor, a refrigerant hot water supply heat exchanger, a pressure reducing means, and an evaporator for collecting atmospheric heat or solar heat. A water heater having a heat exchange relationship with a refrigerant hot water supply heat exchanger provided in the middle of a hot water supply circuit including a heat pump circuit, a hot water storage tank having a built-in heat source at an upper portion, and a circulation pump for circulating water at a lower portion of the hot water tank to an upper portion of the heat source A heat exchanger, a flow control means for controlling a circulating flow rate of the hot water supply circuit, an intermediate temperature detecting means for detecting a hot water temperature at the outlet of the water / hot water supply heat exchanger, and a temperature detection signal of the intermediate temperature detecting means is a set temperature signal A. Comprising control means for controlling the flow rate control means so as to match,
When the set temperature is set to the limit temperature at which the water can be boiled by the operation of the heat pump circuit, in the operation by the heat pump circuit, the water at the lower part of the hot water storage tank is heated to the set temperature at the outlet of the water / water supply heat exchanger and flows into the upper part of the hot water storage tank. . And the inflowing water is further heated to a high temperature by a heat source provided at the upper part of the hot water storage tank. Therefore, the water heated by the heat pump is immediately heated by using a heat source provided separately from the water circulation circuit heated by the heat pump circuit, so that the water can be heated to the set temperature even when the heat source is operated simultaneously. And
Since the heat source for high-temperature heating is built in the hot water storage tank, heat loss from the hot water supply circuit system is small. Therefore, high efficiency simultaneous heat source operation and high capacity can be realized. And since hot water can be stored in the upper part of a hot water storage tank in a short time, quick hot water can be achieved. Furthermore, since the hot water supply circuit is not equipped with a heat source, low pressure loss, simplification and space saving of the hot water supply circuit can be achieved.
In addition, since the heat source is incorporated in the hot water storage tank, the heating density of the heat source can be reduced to lower the heating surface temperature. Therefore, a long life and high reliability of the heat source for scale water and corrosive water can be achieved.

In the invention according to a second aspect, the hot water temperature detecting means for detecting the water temperature in the hot water storage tank at a level higher than the heat source, and the temperature detecting signal of the hot water temperature detecting means is higher than the set temperature signal A. A heat source control means for controlling the output of the heat source so as to match the set temperature signal B is provided. In the combined operation of energizing the heat source and the operation by the heat pump circuit using the compressor, the high temperature hot water of the set temperature is constantly placed on the upper part of the hot water storage tank. And improve the reliability of hot water storage tank and heater equipment.

Further, the invention according to a third aspect of the present invention is a heat source energizing operation in which a single operation is performed by a heat pump circuit at the start of operation, and when the temperature signal of the hot water temperature detecting means reaches a predetermined temperature signal, the heat source is energized. With control means, when water is supplied into the hot water storage tank after the installation of the equipment and trial run is performed,
First, an independent operation is performed by the heat pump circuit, and when the temperature signal of the hot water temperature detecting means provided above the hot water storage tank reaches a predetermined temperature, the heat source can be energized. Therefore, it is possible to prevent the heater from being idled during the test operation, eliminate the disconnection of the heater, and improve the reliability of the device.

The invention according to claim 4 is a water temperature detecting means for detecting a water temperature in a hot water storage tank at substantially the same water level as a heat source, and an independent operation is performed by a heat pump circuit at the start of the operation. The signal is the set temperature signal A
Operation control means for energizing the heat source when the temperature signal reaches substantially the same as the above, and in the combined operation of energizing the heat source with the operation by the heat pump circuit, when the hot water heated to the set temperature A reaches substantially the same water level as the heat source. By energizing the heat source and increasing the ratio of the amount of heating by the heat pump operation, the boiling operation efficiency of the system is further improved.

The invention according to claim 5 is characterized in that an input water temperature detecting means for detecting a water temperature at the inlet of the water / hot water supply heat exchanger, and a single operation by a heat pump circuit at the start of operation.
A heat pump operation is stopped when the temperature signal of the incoming water temperature detection means reaches a predetermined temperature, and a heat source operation control means for energizing the heat source is provided. When the hot water that has flowed to the top of the hot water storage tank starts flowing from the bottom of the hot water storage tank to the hot water supply heat exchanger, the operation of the heat pump is stopped, the heat source is turned on, and the hot water heated by the heat pump while operating the circulation pump is stored in the hot water storage tank. Heat to high temperature within. Therefore, compared to the case where the heat pump and the heat source are simultaneously operated from the beginning, the time for energizing the heater of the heat source in an environment of high-temperature hot water is shortened, and the life of the heater is extended.

According to a sixth aspect of the present invention, a remaining hot water temperature detecting means for detecting a hot water temperature at a preset position in a hot water storage tank and a signal from the remaining hot water temperature detecting means at the start of operation are detected. When the temperature is higher than the predetermined temperature signal, the heat source is not operated, and operation control means for performing an independent operation by the heat pump circuit is provided.When the boiling operation is started at midnight, the temperature of the hot water at a preset position in the hot water storage tank is adjusted. A signal from the remaining hot water temperature detecting means to be detected is detected, and when the signal indicates a temperature lower than a predetermined temperature, hot water is stored by using both the heat pump operation and the operation of the heat source. Conversely, when the signal indicates a temperature higher than the predetermined temperature, the hot water is stored by the heat pump circuit alone without operating the heat source. Therefore, a high-efficiency boiling operation can be realized while satisfying the hot water supply load.

According to a seventh aspect of the present invention, a plurality of remaining hot water temperature detecting means for detecting upper and lower hot water temperatures in a hot water storage tank and a detection signal of the present remaining hot water temperature detecting means from the past several days are stored. Heat source time setting means for setting the energization time of the heat source, and heat source energization time setting means for calculating the energization start time of the heat source by calculating the time of the heat source time setting means from the energization end time of the midnight time zone using the late night power, and A clock that measures the time, when the operation is started, an independent operation is performed by the heat pump circuit, and when the temperature signal of the incoming water temperature detection means reaches a predetermined temperature, the heat pump operation is stopped, and the signals of the heat source energization time setting means and the clock are output. Operation control means for energizing the heat source based on the detection of the hot water temperature distribution in the hot water storage tank when starting the boiling operation at midnight and controlling the energization start time of the heat source to supply hot water load. While to follow, to achieve energy saving.

According to the present invention, a refrigerant flow switching means is provided in the heat pump circuit between the compressor and the refrigerant hot water supply heat exchanger, and the compressor, the evaporator, the pressure reducing means, and the refrigerant hot water heat exchanger are provided. , A refrigerant temperature detection means for detecting the refrigerant temperature at the evaporator inlet of the heat pump circuit, a defrost control means for switching to the defrost operation circuit, and a priority energization for forcibly energizing the heat source. Control means, maximum flow rate control means for controlling the flow rate control means to maximize the amount of circulating water in the hot water supply circuit, and priority energization with the defrost control means when the detection signal of the refrigerant temperature detection means reaches a predetermined temperature or less. It comprises an operation control means for transmitting to the control means and the maximum flow rate control means, during the boiling operation in winter, detecting that frost has formed on the surface of the evaporator of the heat pump circuit at the refrigerant temperature at the evaporator inlet, Switching the refrigerant flow direction of the medium switching means defrosting operation circuit, the circulation water of the hot water supply circuit to the maximum,
Turn on the heat source. Therefore, since the defrost is performed in a short time, the heat pump heating capacity and efficiency are improved. Then, in order to maximize the amount of circulating water flowing through the water / water supply heat exchanger, freezing in the water / water supply heat exchanger is eliminated. In addition, since the cold water is forcibly heated by the heat source, the temperature of the hot water above the hot water storage tank recovers in a short time.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. Note that, in the conventional example and each embodiment, components having the same configuration and the same operation are denoted by the same reference numerals,
Some description is omitted.

Embodiment 1 FIG. 1 is a configuration diagram of a heat pump hot water supply system according to Embodiment 1 of the present invention. In FIG. 1, a solid arrow indicates a flow direction of the refrigerant in the refrigerant circuit, and a broken line indicates a flow direction of water in the hot water supply circuit. 1 is a compressor, 2 is a refrigerant hot-water supply heat exchanger, 3 is a decompression means, 4 is an evaporator that collects atmospheric heat or solar heat, and forms a heat pump circuit 5. Reference numeral 6 denotes a hot water storage tank having a built-in heat source 7 such as a heater at an upper portion thereof. Reference numeral 8 denotes a circulation pump,
The lower water is circulated to the upper part of the heat source 7. Reference numeral 9 denotes a water / hot water supply heat exchanger, which is provided in the middle of a hot water supply circuit 10 having a circulation pump 8 and has a heat exchange relationship with the refrigerant / hot water supply heat exchanger 2. Numeral 11 is a flow rate control means for controlling the circulation flow rate of the hot water supply circuit 10. Reference numeral 12 denotes an intermediate temperature detecting means for detecting the temperature of the hot water at the outlet of the water / hot water supply heat exchanger 9. A control unit 13 controls the flow rate control unit 11 so that the temperature detection signal of the intermediate temperature detection unit 12 matches the set temperature signal A. Then, the set hot water temperature A is set to the maximum temperature that can be heated by the operation of the heat pump circuit.

The operation and operation of the above configuration will be described. First, the single operation by the heat pump circuit that operates the compressor 1 will be described. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the refrigerant hot water heat exchanger 2,
The water at the lower part of the hot water storage tank 6 flowing into the water / hot water supply heat exchanger 9 is heated. Then, the circulation flow rate of the hot water supply circuit 10 is controlled so that the heated water has the set hot water temperature A, and the hot water storage tank 6 is controlled.
Flows above the heat source 7. On the other hand, the refrigerant hot water supply heat exchanger 2
The refrigerant condensed and liquefied in the evaporator 4 is decompressed by the decompression means 3.
, Where it absorbs atmospheric heat or solar heat, evaporates and gasifies, and returns to the compressor 1.

While repeating this cycle, hot water of the set hot water temperature A is stored from the upper portion to the lower portion in the hot water storage tank 6, and the entire amount is stored. Next, a heat pump circuit 5 using the compressor 1
And the combined operation of energizing the heat source 7 will be described. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows to the refrigerant hot water supply heat exchanger 2, and heats the water flowing to the lower part of the hot water storage tank 6 to the water hot water supply heat exchanger 9. Then, the circulation flow rate of the hot water supply circuit 10 is controlled so that the heated water has the set hot water temperature A, and the heated water flows above the heat source 7 of the hot water storage tank 6. Then, the hot water flowing to the upper portion of the hot water storage tank 6 is further heated to a high temperature by the heat source 7. On the other hand, the refrigerant condensed and liquefied in the refrigerant / hot water supply heat exchanger 2 is decompressed by the decompression means 3 and flows into the evaporator 4 where it absorbs atmospheric heat or solar heat to evaporate and return to the compressor 1. While repeating this cycle,
Hot water is stored from the upper part to the lower part in the hot water storage tank, and the entire amount is stored. Therefore, since the heating can be performed up to the maximum temperature that can be heated by the heat pump, a highly efficient hot water storage operation can be realized. And since the heat source for heating at high temperature is built in the hot water storage tank, heat loss from the hot water supply circuit system is small. Furthermore, since the hot water heated by the heat pump is additionally heated to a higher temperature by the heat source above the hot water storage tank to achieve high performance and quick hot water, there is no fear of running out of hot water. And since the heat source is built into the hot water storage tank, the heater can be made slightly larger to lower the watt density of the heater and lower the surface temperature of the heater.
The scale water with high hardness prevents scale adhesion on the heater surface and the acid water prevents corrosion of the heater, realizing high reliability and long life.

As shown in FIG. 2, a flow control type circulation pump 14 is used in place of the flow control means 11 so that the temperature detection signal of the intermediate temperature detection means 12 matches the set temperature signal A. The same effect can be obtained by using the pump control means 15 for controlling the flow rate at 14.

Embodiment 2 FIG. 3 is a configuration diagram of a heat pump hot water supply system according to Embodiment 2 of the present invention. In FIG. 3, reference numeral 16 denotes hot water temperature detecting means for detecting the water temperature in the hot water storage tank at an upper water level from a heat source. Reference numeral 17 denotes a heat source control unit, and the temperature detection signal of the hot water temperature detection unit 16 is a set temperature signal A.
The heat source 7 is set so as to match the set temperature signal B which is higher.
Is controlled intermittently or by varying the output.

The operation and operation of the above configuration will be described. The operation by the heat pump circuit 5 using the compressor 1 and the combined operation of energizing the heat source 7 will be described.
The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows to the refrigerant hot water supply heat exchanger 2, and heats the water flowing from the lower part of the hot water storage tank 6 to the water hot water supply heat exchanger. Then, the circulation flow rate of the hot water supply circuit 10 is controlled so that the heated water has the set hot water temperature A, and the heated water flows above the heat source 7 of the hot water storage tank 6. And
The hot water is stored from the upper part of the hot water storage tank 6 while the heat source 7 is intermittently operated or the output is varied so as to reach the set temperature B. Therefore, high-temperature hot water at the set temperature can be constantly stored in the upper portion of the hot-water storage tank. And since it does not become abnormal high-temperature hot water, the reliability improvement of the equipment of a hot-water storage tank and a heater is implement | achieved.

(Embodiment 3) FIG. 4 is a configuration diagram of a heat pump hot water supply system according to Embodiment 3 of the present invention. In FIG. 4, reference numeral 18 denotes a heat source energization control unit which performs an independent operation by a heat pump circuit at the start of operation, and energizes the heat source by detecting that the temperature signal of the hot water temperature detection unit 16 reaches a predetermined temperature signal.

The operation and operation of the above configuration will be described. When water is supplied into the hot water storage tank and the test operation is performed after installation of the apparatus, first, the heat pump circuit 5 performs an independent operation, and the hot water heated by the heat pump flows into the upper portion of the hot water storage tank 6. At this time, when the inside of the hot water storage tank 6 is full, the water temperature of the upper part of the hot water storage tank 6 rises. When the temperature signal of the hot water temperature detecting means 16 provided at the top of the hot water storage tank 6 reaches a predetermined temperature, the heat source 7 can be energized. On the other hand, when the water level in the hot water storage tank 6 is lower than the installation position of the hot water temperature detecting means 16, that is, when the water is not full, the hot water heated by the heat pump
The temperature signal of the hot water temperature detecting means 16 does not reach the predetermined temperature because the water signal falls to the highest water level in the inside. In this case, the heat source 7 is not energized. Therefore, the idle operation of the heater can be prevented during the test operation, so that the heater is not disconnected, and the reliability of the device is improved.

(Embodiment 4) FIG. 5 is a configuration diagram of a heat pump hot water supply system according to Embodiment 4 of the present invention. In FIG. 5, reference numeral 19 denotes a water temperature detecting means for detecting the water temperature in the hot water storage tank 6 at substantially the same water level as the heat source 7. Reference numeral 20 denotes an operation control unit, which performs an independent operation by the heat pump circuit 5 at the start of the operation, and energizes the heat source 7 when the temperature detection signal of the water temperature detection unit 19 reaches the same temperature signal as the set temperature signal A.

The operation and operation of the above configuration will be described. After the operation by the heat pump circuit is started, the hot water heated to the set temperature A is stored on the hot water storage tank 6. And, with the elapse of operation time, the surface of the water drops down,
When the water level reaches substantially the same as the heat source 7, the water temperature is detected by the water temperature detecting means 19 and the heat source 7 is energized. Then, the hot water of the set temperature A in the hot water storage tank above the heat source 7 is additionally heated and heated to a high temperature. Therefore, the hot water to be heated by the heat source is always hot water heated to the set temperature A by the heat pump circuit, so that the ratio of the amount of heating by the heat pump operation increases, and the boiling operation efficiency of the system is remarkably improved.

(Embodiment 5) FIG. 6 is a configuration diagram of a heat pump hot water supply system according to Embodiment 5 of the present invention. In FIG. 6, reference numeral 21 denotes an incoming water temperature detecting means for detecting the water temperature at the inlet of the water / hot water supply heat exchanger. 22 is a heat source operation control means,
At the start of the operation, the heat pump circuit performs an independent operation. When the temperature signal of the incoming water temperature detecting means 21 reaches a predetermined temperature, the heat pump operation is stopped and the heat source is energized.
The predetermined temperature indicates a limit temperature of a feed water temperature at which the heat pump can be operated at a high pressure of the heat pump circuit or a rising limit of the discharge temperature of the compressor.

The operation and operation of the above configuration will be described. Operation by heat pump circuit 5 and heat source 7
In the combined operation of energizing, the operation is started independently by the heat pump circuit, and the hot water of the set temperature A is stored from above the hot water storage tank 6. Then, when the hot water boiled by the heat pump starts flowing from below the hot water storage tank to the hot water supply heat exchanger 9, the heat pump operation is stopped and the heat source 7 is energized. Then, the hot water storage tank 6 is
The hot water is heated to a high temperature in the hot water storage tank 6 by the heat source 7 while circulating the hot water boiled by the heat pump from below to above. Therefore,
When simultaneously operating the heat pump and heat source from the beginning, the heat source is energized in the environment of high-temperature hot water refired from the beginning to the end of operation, so the surface temperature of the heater becomes high for a long time. While the amount of corrosion or scale adhesion is large, the heat source is not energized under the intermediate temperature environment when operating the heat pump alone, so the time to energize under the environment of high temperature hot water is short, A longer life of the heater is achieved.

(Embodiment 6) FIG. 7 is a configuration diagram of a heat pump hot water supply system according to Embodiment 6 of the present invention. In FIG. 7, reference numeral 23 denotes remaining hot water temperature detection means for detecting the hot water temperature at a preset position in the hot water storage tank 6. For example, the boiling water temperature when the heat pump operation and the heat source operation are used together is 9
When the temperature is 0 ° C., the feed water temperature is 15 ° C. and the hot water storage tank 300
In homes or seasons when 200 L of 90 ° C. hot water is used for L, the hot water supply load is (90−15) × 200 /
860 = 17.4 kW. When this load is heated to 65 ° C. by the heat pump operation, 17.4 × 860 /
Boiling (65-15) = 300 L corresponds to the hot water supply load. Therefore, the remaining hot water temperature detecting means is provided at a position of the hot water storage amount of 100 L from the top of the hot water storage tank. An operation control means 24 detects a signal from the remaining hot water temperature detecting means 23 at the start of the operation, and when the temperature is higher than a predetermined temperature signal, does not operate the heat source 7 but performs an independent operation by the heat pump circuit 5.

The operation and operation of the above configuration will be described. The hot water of 90 ° C. which was boiled using the heat pump operation and the heat source operation on the previous day is discharged from the hot water storage tank 6 and used. Then, when the boiling operation is started at midnight of the day, the signal of the remaining hot water temperature detecting means 23 in the hot water storage tank is detected, and when the signal indicates a temperature lower than the predetermined temperature, the heat pump operation and the operation of the heat source 7 are performed. The flow rate control means 11 and the heat source control means 17 are controlled so as to be at the set temperature B (for example, 90 ° C.) in combination, and the hot water at the set temperature B is stored in the hot water storage tank 6. Conversely, when the signal indicates a temperature higher than the predetermined temperature, the heat source 7 is not operated and the heat pump circuit is operated alone to control the flow rate so that the temperature becomes lower than the set temperature B (for example, 65 ° C.). Means 1
1 is performed to store hot water at the set temperature A in the hot water storage tank 6. Therefore, a high-efficiency boiling operation can be realized while satisfying the hot water supply load.

(Embodiment 7) FIG. 8 is a configuration diagram of a heat pump hot water supply system according to Embodiment 7 of the present invention. In FIG. 8, reference numeral 25 denotes remaining hot water temperature detecting means for detecting a plurality of upper and lower hot water temperatures in a hot water storage tank. Reference numeral 26 denotes a heat source time setting unit which stores the detection signal of the remaining hot water temperature detection unit 25 from the past several days and sets the energization time of the heat source 7. Reference numeral 27 denotes a heat source energization time setting unit that calculates the energization start time of the heat source 7 by calculating the time of the heat source time setting unit 26 from the midnight time zone energization end time (7:00 or 8:00 in the morning) using the midnight power. 28 is a clock, 29 is operation control means,
At the start of the operation, the heat pump circuit performs an independent operation. When the temperature signal of the incoming water temperature detection means 21 reaches a predetermined temperature, the heat pump operation is stopped, and the heat source 7 is turned on based on the heat source energization time setting means 27 and the clock 28 signal. Turn on electricity.

The operation and operation of the above configuration will be described. When the boiling operation is started at midnight, signals from a plurality of remaining hot water temperature detecting means 25 in the hot water storage tank 6 are detected. Then, when the detection position of the signal indicating the temperature higher than the predetermined temperature is a position lower than the previous day, the energizing time of the heat source 7 is set shorter than the previous day. That is, the amount of heat released from hot water storage tank 6 is reduced by delaying the start time of energization of heat source 7.
Then, the amount of heat stored in the hot water is reduced to suppress unnecessary energy consumption. Conversely, when the detection position indicating a higher temperature than the predetermined temperature from the signal of the remaining hot water temperature detection means 25 is a position higher than the previous day, the energization time of the heat source 7 is set longer than the previous day. That is, the passage start time of the heat source 7 is advanced to follow the hot water supply load. Therefore, energy saving is realized while following the hot water supply load.

(Eighth Embodiment) FIG. 9 is a configuration diagram of a heat pump hot water supply system according to an eighth embodiment of the present invention. In FIG. 9, reference numeral 30 denotes a refrigerant flow switching means, which is provided in the heat pump circuit between the compressor 1 and the refrigerant hot water heat exchanger 2, and is provided with a compressor 1, an evaporator 4, a pressure reducing means 3, a refrigerant hot water heat exchanger 2 The defrosting operation circuit 31 for flowing the refrigerant in this order is constructed. Reference numeral 32 denotes a refrigerant temperature detecting means for detecting the refrigerant temperature at the inlet of the evaporator 4 of the heat pump circuit. 33 is a defrost control means, which transmits to the refrigerant flow switching means 30 and switches to the defrost operation circuit 31. Reference numeral 34 denotes priority energization control means for forcibly energizing the heat source 7. Reference numeral 35 denotes a maximum flow rate control means, which controls the flow rate control means 11 so as to maximize the amount of circulating water in the hot water supply circuit 10.
Control. Reference numeral 36 denotes an operation control unit, which transmits to the defrost control unit 33, the priority energization control unit 34, and the maximum flow control unit 35 when the detection signal of the refrigerant temperature detection unit 32 reaches a predetermined temperature or lower.

The operation and operation of the above configuration will be described. During the boiling operation in winter, the frost formation on the surface of the evaporator 4 of the heat pump circuit and the decrease in the evaporation temperature are detected by the refrigerant temperature detecting means at the inlet of the evaporator 4 and the refrigerant flow switching means 30 Is switched to the defrosting operation circuit 31 to maximize the amount of circulating water in the hot water supply circuit 10 and energize the heat source 7. And the compressor 1
The frost on the surface of the evaporator 4 is defrosted by the heat of condensation of the refrigerant discharged from the refrigerant, and the refrigerant flows into the refrigerant hot water supply heat exchanger 2. Here, heat is collected from the water flowing through the water / hot water supply heat exchanger 9 and is sucked into the compressor 1. On the other hand, the water flowing out of the water / hot water supply heat exchanger 9 is lowered in temperature and flows to the upper part of the hot water storage tank 6 to be heated by the heat source 7. Therefore, since the defrost is performed in a short time, the heat pump heating capacity and efficiency are improved. Then, in order to maximize the amount of circulating water flowing through the water / water supply heat exchanger, freezing in the water / water supply heat exchanger is eliminated. In addition, since the cold water is forcibly heated by the heat source, the temperature of the hot water above the hot water storage tank recovers in a short time.

[0034]

As is apparent from the above description, according to the first aspect of the present invention, the compressor, the refrigerant hot water heat exchanger,
In the middle of a hot water supply circuit comprising a decompression means, a heat pump circuit composed of an evaporator for collecting atmospheric heat or solar heat, a hot water storage tank with a built-in heat source at the top, and a circulation pump for circulating water under the hot water tank to the top of the heat source. A hot water supply heat exchanger having a heat exchange relationship with the provided refrigerant hot water supply heat exchanger, a flow rate control means for controlling a circulation flow rate of the hot water supply circuit, and an intermediate temperature detection means for detecting a hot water temperature at the outlet of the hot water supply heat exchanger. And control means for controlling the flow rate control means so that the temperature detection signal of the intermediate temperature detection means coincides with the set temperature signal A, thereby simultaneously operating the heat sources with high efficiency, reducing the heat radiation loss from the hot water supply circuit system, and increasing the capacity. And realizing hot water. Further, low pressure loss, simplification, and space saving of the hot water supply circuit are achieved. Also,
Achieve long life and high reliability of heat source for scale water and corrosive water.

According to the second aspect of the present invention, the hot water temperature detecting means for detecting the water temperature in the hot water storage tank at a level higher than the heat source, and the temperature detection signal of the hot water temperature detecting means is higher than the set temperature signal A. A heat source control means for controlling the output of the heat source so as to coincide with the set temperature signal B, and in the combined operation of energizing the heat source and the operation by the heat pump circuit using the compressor, the set temperature is constantly set above the hot water storage tank. It will store hot water and improve the reliability of hot water storage tank and heater equipment.

According to the third aspect of the present invention, when the operation is started, the heat pump circuit is operated independently, and when the temperature signal of the hot water temperature detecting means reaches a predetermined temperature signal, the heat source is energized. A heat source energization control unit is provided to prevent the heater from being idle when a test operation is performed after installation of the equipment, to eliminate heater disconnection, and to improve the reliability of the equipment.

According to the fourth aspect of the present invention, the water temperature detecting means for detecting the water temperature in the hot water storage tank at substantially the same water level as the heat source, and the single operation by the heat pump circuit at the start of operation, the water temperature detecting means Operation control means for energizing the heat source when the temperature detection signal reaches substantially the same temperature signal as the set temperature signal A is provided. In the combined operation of energizing the heat source and the operation by the heat pump circuit, the rate of heating by the heat pump operation is increased. Thus, the boiling operation efficiency of the system is significantly improved.

According to the fifth aspect of the present invention, the input water temperature detecting means for detecting the water temperature at the inlet of the hot water supply heat exchanger, and when the operation is started, the heat pump circuit is operated independently to perform the independent operation. The heat pump operation is stopped when the temperature signal reaches a predetermined temperature, and the heat source operation control means for energizing the heat source is provided.The time for energizing the heater of the heat source in a high-temperature hot water environment is shortened to extend the life of the heater. To achieve.

According to the sixth aspect of the present invention, the remaining hot water temperature detecting means for detecting the hot water temperature at a preset position in the hot water storage tank and the signal of the remaining hot water temperature detecting means at the start of operation are detected. When the temperature is higher than the predetermined temperature signal, the heat source is not operated, and operation control means for performing an independent operation by the heat pump circuit is provided. When the boiling operation is started at midnight, the hot water at a preset position in the hot water storage tank is provided. A signal from a remaining hot water temperature detecting means for detecting a temperature is detected to satisfy a hot water supply load and realize a highly efficient boiling operation.

Further, the invention according to claim 7 stores a plurality of remaining hot water temperature detecting means for detecting upper and lower hot water temperatures in a hot water storage tank and a detection signal of the present remaining hot water temperature detecting means from the past several days. Heat source time setting means for setting the energization time of the heat source, and heat source energization time setting means for calculating the energization start time of the heat source by calculating the time of the heat source time setting means from the energization end time of the midnight time zone using the late night power, and A clock that measures the time, when the operation is started, an independent operation is performed by the heat pump circuit, and when the temperature signal of the incoming water temperature detection means reaches a predetermined temperature, the heat pump operation is stopped, and the signals of the heat source energization time setting means and the clock are output. Operation control means for energizing the heat source based on the detection of the hot water temperature distribution in the hot water storage tank when starting the boiling operation at midnight and controlling the energization start time of the heat source to supply hot water load. While to follow, to achieve energy saving.

In the invention according to claim 8, a refrigerant flow switching means is provided in the heat pump circuit between the compressor and the refrigerant hot water supply heat exchanger, and the compressor, the evaporator, the pressure reducing means, and the refrigerant hot water heat exchanger are provided. , A refrigerant temperature detection means for detecting the refrigerant temperature at the evaporator inlet of the heat pump circuit, a defrost control means for switching to the defrost operation circuit, and a priority energization for forcibly energizing the heat source. Control means, maximum flow rate control means for controlling the flow rate control means to maximize the amount of circulating water in the hot water supply circuit, and priority energization with the defrost control means when the detection signal of the refrigerant temperature detection means reaches a predetermined temperature or less. An operation control means for transmitting to the control means and the maximum flow rate control means, in a boiling operation in winter, defrosting in a short time to improve a heat pump heating capacity and an operation efficiency, and a water / hot water supply heat exchanger. To eliminate the freeze.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram of another heat pump hot water supply system according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a heat pump hot water supply system according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a heat pump hot water supply system according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a heat pump hot water supply system according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of a heat pump hot water supply system according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram of a heat pump hot water supply system according to a sixth embodiment of the present invention.

FIG. 8 is a configuration diagram of a heat pump hot water supply system according to a seventh embodiment of the present invention.

FIG. 9 is a configuration diagram of a heat pump hot water supply system according to an eighth embodiment of the present invention.

FIG. 10 is a configuration diagram of a conventional heat pump hot water supply system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Refrigerant hot water heat exchanger 3 Decompression means 4 Evaporator 5 Heat pump circuit 6 Hot water storage tank 7 Heat source 8 Circulation pump 9 Water hot water heat exchanger 10 Hot water supply circuit 11 Flow control means 12 Intermediate temperature detection means 13 Control means 14 Circulation pump 15 Pump control means 16 Hot water temperature detection means 17 Heat source control means 18 Heat source conduction control means 19 Water temperature detection means 20, 24, 29, 36 Operation control means 21 Incoming water temperature detection means 22 Heat source operation control means 23, 25 Remaining hot water temperature detection means 26 heat source time setting means 27 heat source energizing time setting means 28 clock 30 refrigerant flow switching means 31 defrost operation circuit 32 refrigerant temperature detecting means 33 defrost control means 34 priority energization control means 35 maximum flow rate control means

Claims (8)

[Claims] 1. A heat pump circuit comprising a compressor, a refrigerant hot water supply heat exchanger, a decompression means, an evaporator for collecting atmospheric heat or solar heat, a hot water storage tank having a built-in heat source at an upper part, and a water at a lower part of the hot water storage tank. A water hot water supply heat exchanger having a heat exchange relationship with the refrigerant hot water supply heat exchanger provided in the middle of the hot water supply circuit having a circulation pump circulating to the upper part of the heat source, and a flow control means for controlling a circulation flow rate of the hot water supply circuit, Intermediate temperature detecting means for detecting the temperature of the hot water at the outlet of the water / hot water supply heat exchanger; and control means for controlling the flow rate controlling means such that the temperature detection signal of the intermediate temperature detecting means matches the set temperature signal A. Heat pump hot water supply system. 2. A hot water temperature detecting means for detecting a water temperature in a hot water storage tank at an upper water level from a heat source, and a temperature detection signal of the hot water temperature detecting means coincides with a set temperature signal B higher than a set temperature signal A. 2. A heat pump hot water supply system according to claim 1, further comprising a heat source control means for controlling an output of said heat source. 3. A heat source energization control means for performing independent operation by a heat pump circuit at the start of operation, and energizing the heat source by detecting that the temperature signal of the hot water temperature detection means reaches a predetermined temperature signal. Or the heat pump hot water supply system according to 2. 4. A water temperature detecting means for detecting a water temperature in a hot water storage tank having substantially the same water level as a heat source, and an independent operation by a heat pump circuit at the start of operation, wherein a temperature detection signal of said water temperature detecting means is substantially equal to a set temperature signal A. 3. The heat pump hot water supply system according to claim 1, further comprising an operation control unit that energizes the heat source when the temperature signal is reached. 5. An inflow water temperature detecting means for detecting the water temperature at the inlet of the water / hot water supply heat exchanger, and an independent operation by a heat pump circuit at the start of operation, and when the temperature signal of the inflow water temperature detection means reaches a predetermined temperature. The heat pump hot water supply system according to claim 1 or 2, further comprising a heat source operation control unit that stops the operation of the heat pump and energizes the heat source. 6. A remaining hot water temperature detecting means for detecting a hot water temperature at a preset position in a hot water storage tank, and detecting a signal of said remaining hot water temperature detecting means at the start of operation, and when the temperature is higher than a predetermined temperature signal. The heat pump hot water supply system according to claim 1, further comprising operation control means for performing an independent operation by the heat pump circuit without operating the heat source. 7. A plurality of remaining hot-water temperature detecting means for detecting upper and lower hot-water temperatures in a hot-water storage tank, and a current detection signal of the remaining hot-water temperature detecting means from the past several days are stored to set an energizing time of a heat source. Heat source time setting means, a heat source energization time setting means for calculating the energization start time of the heat source by calculating the energization start time of the heat source by calculating the time of the heat source time setting means from the energization end time of the midnight time zone of the midnight power use, and a clock for measuring the time. At the start of operation, a single operation is performed by the heat pump circuit, the heat pump operation is stopped when the temperature signal of the incoming water temperature detection means reaches a predetermined temperature, and the heat source is turned on based on the heat source energization time setting means and the clock signal. The heat pump hot water supply system according to claim 1, further comprising an operation control unit for supplying electricity. 8. A defrosting operation circuit in which a refrigerant flow switching means is provided in the middle of a heat pump circuit between a compressor and a refrigerant hot water heat exchanger, and a refrigerant flows in the order of a compressor, an evaporator, a pressure reducing means, and a refrigerant hot water heat exchanger. Refrigerant temperature detection means for detecting the refrigerant temperature at the evaporator inlet of the heat pump circuit, defrost control means for switching to the defrost operation circuit, priority energization control means for forcibly energizing the heat source, and circulation of the hot water supply circuit Maximum flow rate control means for controlling the flow rate control means to maximize the amount of water, when the detection signal of the refrigerant temperature detection means reaches a predetermined temperature or less,
3. The heat pump hot water supply system according to claim 1, further comprising an operation control unit that transmits the defrost control unit, the priority energization control unit, and the maximum flow rate control unit. 4.