JP2013224790A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type water heater capable of performing a freezing prevention operation of a heat pump unit at an appropriate timing while promoting reduction in standby power of the heat pump unit.SOLUTION: A power source supply control circuit 123 generates a state in which a heat pump control circuit 125 is supplied with power source by a power source switching circuit 124 in a case where a temperature that is indicated by outside air temperature data is equal to a first freezing determination temperature or lower when the tank outside air temperature data is received from a hot water storage unit. The heat pump control circuit 125, when a detected temperature of a heat pump outside air temperature sensor 67 is equal to a second freezing determination temperature or lower, performs freezing prevention operation of the heat pump unit.

Description

  The present invention relates to a hot water storage type hot water supply apparatus that heats hot water in a hot water storage tank by a heat pump.

  Conventionally, in a hot water storage type hot water supply apparatus that heats and boils hot water in a hot water storage tank with a heat pump, a hot water storage unit having a hot water storage tank supplies and shuts off power to a control circuit of the heat pump unit having a heat pump as necessary. The structure which reduced standby electric power of the heat pump unit by controlling is known (for example, refer to patent documents 1).

  In the hot water storage type hot water supply apparatus described in Patent Document 1, the hot water storage unit supplies power to the control circuit of the heat pump unit when it detects that the hot water tank has run out, and operates the heat pump to supply hot water in the hot water storage tank. Boiled.

  Further, the hot water storage unit supplies power to the control circuit of the heat pump unit when the temperature detected by the outside air temperature sensor provided in the hot water storage unit is low (4 ° C. or lower), and performs the freeze prevention operation of the heat pump unit. Is going.

  Further, in Patent Document 1, as an embodiment in the case where an outside air temperature sensor is not provided in the hot water storage unit, power is supplied to the control circuit of the heat pump unit every time a certain time (2 hours) elapses, and the heat pump unit is supplied to the heat pump unit. A configuration is also disclosed in which the freeze prevention operation of the heat pump unit is performed when the detected temperature of the provided outside air temperature sensor is low.

JP 2004-198044 A

  In a hot water storage system with a hot water storage unit and a heat pump unit, when the hot water storage unit is installed indoors and the heat pump unit is installed outdoors, or when the hot water storage unit is installed in a place where it is difficult for wind to blow, the heat pump unit The installation situation of the hot water storage unit and the heat pump unit may be different, for example, when installed in a place where it is easy to blow.

  Thus, when the installation conditions of the hot water storage unit and the heat pump unit are different, the heat pump unit is frozen based on the detected temperature of the outside air temperature sensor provided in the hot water storage unit, as in the hot water storage type hot water supply apparatus of Patent Document 1 described above. When the prevention operation is performed, there is a possibility that the timing for performing the freeze prevention operation becomes inappropriate due to the difference in the ambient temperature between the hot water storage unit and the heat pump unit.

  Moreover, like the hot water storage type hot water supply apparatus described in Patent Document 1, power is supplied to the heat pump unit at regular intervals, and the freeze prevention operation of the heat pump unit is performed based on the detected temperature of the outside air temperature sensor provided in the heat pump unit. When performing the operation, there is a possibility that the execution timing of the freeze prevention operation is delayed when the outside air temperature rapidly decreases.

  The present invention has been made in view of the background of the present invention, and an object thereof is to provide a hot water storage type hot water supply apparatus capable of performing antifreezing operation of a heat pump unit at an appropriate timing while reducing standby power of the heat pump unit. And

  The present invention has been made to achieve the above object, and relates to a hot water storage type hot water supply apparatus having a hot water storage unit having a hot water storage tank and a heat pump unit for heating hot water in the hot water storage tank by a heat pump.

And the hot water storage type hot water supply apparatus of the present invention is
A hot water storage unit having a hot water storage tank;
A hot water storage type hot water supply apparatus having a heat pump unit for heating hot water in the hot water storage tank by a heat pump,
The hot water storage unit is
A tank communication circuit for communicating with the heat pump unit;
A tank outside air temperature sensor for detecting the ambient temperature of the hot water storage unit;
A tank outside air temperature data indicating a temperature detected by the tank outside air temperature sensor, and a tank outside air temperature transmitter for transmitting to the heat pump unit,
The heat pump unit is
A heat pump communication circuit for communicating with the hot water storage unit;
A heat pump outside air temperature sensor for detecting the ambient temperature of the heat pump unit;
A heat pump control circuit connected to the heat pump outside air temperature sensor to control the operation of the heat pump;
A power supply switching circuit that switches between supply and interruption of power to the heat pump control circuit;
When the tank outside air temperature data is received from the heat pump unit, it is determined whether or not the temperature indicated by the outside air temperature data is equal to or lower than a predetermined freezing determination temperature, and when the temperature is equal to or lower than the freezing determination temperature As a state in which power is supplied to the heat pump control circuit by the power supply switching circuit, the heat pump control circuit is caused to execute the freeze prevention operation of the heat pump unit based on the detected temperature of the heat pump outside air temperature sensor,
A power supply control circuit configured to shut off the power supply to the heat pump control circuit by the power switching circuit when the anti-freezing operation is not performed (first operation). 1 invention).

  According to the first aspect of the present invention, when the freeze prevention operation by the heat pump unit is not performed, the power supply control unit cuts off the power supply to the heat pump control circuit. Therefore, in the standby state, the power consumption of the heat pump unit is mainly suppressed to the power consumption of the heat pump communication circuit and the power supply control circuit, and the standby power of the heat pump unit is reduced.

  The power supply control unit, when receiving the tank outside air temperature data from the hot water storage unit, determines whether the temperature indicated by the outside air temperature data is equal to or lower than the freezing determination temperature, and the temperature is When the temperature is equal to or lower than the freezing determination temperature, the heat pump control circuit is caused to execute the antifreezing operation of the heat pump unit based on the temperature detected by the heat pump outside air temperature sensor. Therefore, the freeze prevention operation of the heat pump unit can be executed at an appropriate timing using the detected temperature of the heat pump outside air temperature sensor provided in the heat pump unit.

In the first invention,
The hot water storage unit includes a plurality of temperature sensors having different installation locations as the tank outside air temperature sensor,
The tank outside air temperature transmitter transmits data indicating the lowest detected temperature among the detected temperatures of the plurality of temperature sensors to the heat pump unit as the tank outside air temperature data (second invention). ).

  According to the second invention, it is possible to suppress a divergence between the detected temperature of the tank outside air temperature sensor and the actual outside air temperature, which may occur depending on the installation state of the hot water storage unit.

In the first invention,
An auxiliary heat source machine that is connected to the hot water storage tank and is provided in the middle of the hot water supply pipe to which hot water in the hot water storage tank is supplied, and that heats the hot water flowing through the hot water supply pipe;
An auxiliary heat source outside air temperature sensor for detecting the ambient temperature of the auxiliary heat source unit;
An auxiliary heat source communication circuit for communicating with the hot water storage unit;
An auxiliary heat source unit having an auxiliary heat source outside air temperature transmission unit that transmits auxiliary heat source outside air temperature data indicating the detection temperature of the auxiliary heat source outside air temperature sensor to the hot water storage unit;
The tank communication circuit communicates with the auxiliary heat source unit,
The tank outside temperature transmitter transmits data indicating a lower one of the temperature indicated by the auxiliary heat source outside temperature data and the detected temperature of the tank outside temperature sensor as the tank outside temperature data. It transmits to a heat pump unit (3rd invention).

  According to the third aspect of the invention, the tank outside air temperature sensor and the actual outside air temperature are higher than the actual outside air temperature depending on the installation state of the hot water storage unit, but the auxiliary heat source outside air temperature sensor can detect the outside air temperature relatively accurately. In this case, the outside temperature data can be transmitted by using the temperature detected by the outside heat source outside temperature sensor.

In the third invention,
The hot water storage unit includes a plurality of temperature sensors as the tank outside air temperature sensor,
The tank outside air temperature transmission unit uses, as the tank outside air temperature data, data indicating the lowest temperature among the temperature indicated by the auxiliary heat source outside air temperature data and the detected temperatures of the plurality of temperature sensors as the heat pump unit. (4th invention).

  According to a fourth aspect of the present invention, by comparing the detection temperatures of the plurality of tank outside air temperature sensors and the auxiliary heat source outside air temperature sensors, the detection temperature assumed to be closest to the actual outside air temperature is adopted, and the tank Outside temperature data can be transmitted.

The block diagram of a hot water storage type hot water supply apparatus. 3 is a three-side view of a hot water storage unit and an auxiliary heat source unit. FIG. The control block diagram of a hot water storage type hot water supply apparatus.

  An embodiment of the present invention will be described with reference to FIGS. Referring to FIG. 1, a hot water storage type hot water supply apparatus 1 of the present embodiment includes a hot water storage unit 10, a heat pump unit 50, an auxiliary heat source unit 80, and a remote control 140 for remotely operating the hot water storage type hot water supply apparatus 1. Has been.

  The hot water storage unit 10 includes a hot water storage tank 11, a water supply pipe 12, a hot water discharge pipe 13, and the like. The hot water storage tank 11 retains hot water therein and stores it, and tank temperature sensors 14 to 17 arranged at substantially equal intervals in the height direction and an upper part of the hot water storage tank 11 to supply the hot water pipe 13 from the hot water storage tank 11. A tank hot water temperature sensor 26 is provided for detecting the temperature of the hot water. A drain valve 18 is provided at the bottom of the hot water storage tank 11 and is opened by an operator's manual operation.

  One end of the water supply pipe 12 is connected to a water supply (not shown) through the water supply port 30, and the other end is connected to the lower part of the hot water storage tank 11 to supply water to the lower part of the hot water storage tank 11. The water supply pipe 12 allows water to flow only in the direction from the water supply pipe 12 to the hot water storage tank 11 by preventing the internal pressure of the hot water storage tank 11 from becoming excessive, and to supply water from the hot water storage tank 11. A first hot water side check valve 20 is provided to prevent outflow of hot water to the pipe 12 side.

  The water supply bypass pipe 34 branched from the water supply pipe 12 communicates with the hot water discharge pipe 13 at the connection point X via the hot water supply mixing valve 21, and hot water supplied from the hot water storage tank 11 to the hot water supply pipe 13 by the hot water supply mixing valve 21. And the mixing ratio of the water supplied from the feed water bypass pipe 34 to the hot water discharge pipe 13 is changed.

  The feed water bypass pipe 34 includes a feed water temperature sensor 22 that detects the temperature of the water supplied to the feed water bypass pipe 34, a water-side flow sensor 23 that detects the flow rate of the water flowing through the feed water bypass pipe 34, and the feed water bypass pipe. There is provided a water-side check valve 24 that allows water only in the direction from 34 to the hot water discharge pipe 13 and prevents outflow of hot water from the hot water discharge pipe 13 to the feed water bypass pipe 34 side.

  The hot water discharge pipe 13 has one end connected to the hot water supply port 31 and the other end connected to the upper part of the hot water storage tank 11. Hot water stored in the upper part of the hot water storage tank 11 is supplied from a hot water outlet pipe 13 to a hot water tap (not shown) (kitchen, washroom, bathroom currant, shower, etc.) via a hot water outlet 31. A second hot water side check valve 25 that allows the hot water pipe 13 to pass water only in the direction from the hot water storage tank 11 to the hot water discharge pipe 13 and prevents the hot water from flowing into the hot water storage tank 11 side from the hot water storage pipe 11. A hot water flow rate sensor 27 for detecting the flow rate of hot water supplied from the hot water storage tank 11 to the hot water discharge pipe 13 is provided.

  The auxiliary heat source unit 80 is provided in the middle of the downstream side of the connection point X with the feed water bypass pipe 34 of the tap water pipe 13, and the hot water storage unit 10 bypasses the auxiliary heat source unit 80 and is downstream of the auxiliary heat source unit 80. A hot water bypass pipe 33 that connects the hot water outlet pipe 13 to the upstream side and a hot water bypass valve 29 that opens and closes the hot water bypass pipe 33 are provided.

  A mixing temperature sensor 28 that detects the temperature of hot water supplied to the hot water discharge pipe 13 through the hot water supply mixing valve 21 is provided between the hot water mixing valve 21 and the branch point Y of the hot water discharge pipe 13 with the hot water supply bypass pipe 33. A hot water supply temperature sensor 32 that detects the temperature of hot water discharged from the hot water supply port 31 is provided between the joining point Z of the hot water supply pipe 13 and the hot water supply bypass pipe 33 and the hot water supply port 31. Further, a first tank outside air temperature sensor 35 and a second tank outside air temperature sensor 36 for detecting the ambient temperature (outside air temperature) of the hot water storage unit 10 are provided.

  The hot water storage unit 10 further includes a hot water storage controller 100 that controls the overall operation of the hot water storage unit 10. The hot water storage controller 100 is an electronic circuit unit including a CPU, a memory, various interface circuits, etc. (not shown), and the hot water storage unit 10 operates by executing a control program for the hot water storage unit 10 held in the memory by the CPU. It controls and functions as a boiling instruction transmission unit 102 and a tank outside temperature transmission unit 103 which will be described later.

  Detection signals from the sensors provided in the hot water storage unit 10 are input to the hot water storage controller 100. The operation of the hot water supply mixing valve 21 and the hot water bypass valve 29 is controlled by a control signal output from the hot water storage controller 100.

  Next, the heat pump unit 50 circulates the hot water in the hot water storage tank 11 through the tank circulation path 41 and heats it, and is installed outdoors. The heat pump unit 50 includes a heat pump 51 including an evaporator 53, a compressor 54, a heat pump heat exchanger 55 (condenser), and an expansion valve 56 connected by a heat pump circuit 52.

  The evaporator 53 exchanges heat between air (outside air) supplied by the rotation of the fan 60 and a heat medium (alternative chlorofluorocarbon (HFC) or other chlorofluorocarbon, carbon dioxide, etc.) flowing through the heat pump circuit 52. Do. The compressor 54 compresses the heat medium discharged from the evaporator 53 to high pressure and high temperature, and sends it to the heat pump heat exchanger 55. The expansion valve 56 releases the pressure of the heat medium pressurized by the compressor 54.

  The defrost valve 61 is provided so as to bypass the expansion valve 56, and defrosts the evaporator 53 with a heat medium sent from the compressor 54. Heat medium temperature sensors 62, 63 for detecting the temperature of the heat medium circulating in the heat pump circuit 52 are provided upstream and downstream of the expansion valve 56 of the heat pump circuit 52 and upstream and downstream of the compressor 54. 64 and 65 are provided, respectively. Further, the evaporator 53 is provided with a heat pump outside air temperature sensor 67 that detects the temperature of the air sucked into the evaporator 53.

  The heat pump heat exchanger 55 is connected to the tank circulation path 41, and circulates in the tank circulation path 41 by heat exchange between the heat medium that has been increased in pressure and temperature by the compressor 54 and hot water flowing in the tank circulation path 41. Heat the hot water. The tank circulation path 41 is provided with a tank circulation pump 66 for circulating hot water in the hot water storage tank 11 through the tank circulation path 41.

  Hot water stored in the lower part of the hot water storage tank 11 is guided to the tank circulation path 41 by the tank circulation pump 66, heated to a boiling temperature described later by the heat pump heat exchanger 55, and returned to the upper part of the hot water storage tank 11. Thereby, the boiling water at the boiling temperature is sequentially stacked from the upper part of the hot water storage tank 11 and stored.

  Note that hot water temperature sensors 68 and 69 for detecting the temperature of hot water flowing in the tank circulation path 41 are provided on the upstream side and the downstream side of the heat pump heat exchanger 55 in the tank circulation path 41. The heat pump heat exchanger 55 is provided with an ambient temperature sensor 57 that detects the ambient temperature inside the heat pump heat exchanger 55.

  Furthermore, the heat pump unit 50 includes a heat pump controller 120 that controls the overall operation of the heat pump unit 50. The heat pump controller 120 is an electronic circuit unit having a CPU, a memory, various interface circuits, etc. (not shown). The CPU executes a control program for the heat pump unit 50 held in the memory, thereby operating the heat pump unit 50. Control.

  The detection signal of each sensor provided in the heat pump unit 50 is input to the heat pump controller 120. The operations of the compressor 54, the tank circulation pump 66, and the fan 60 are controlled by a control signal output from the heat pump controller 120.

  Next, the auxiliary heat source unit 80 heats hot water flowing through the hot water discharge pipe 13, and includes a hot water supply burner 81 housed in the can body 87, a hot water supply heat exchanger 82 heated by the hot water supply burner 81, and the like. ing. Fuel gas is supplied to the hot water supply burner 81 from a gas supply pipe (not shown), and combustion air is supplied from a combustion fan (not shown).

  The hot water supply heat exchanger 82 is connected in the middle of the hot water discharge pipe 13, and heats the hot water flowing inside by the combustion heat of the hot water supply burner 81. The hot water discharge pipe 13 is provided with a water amount servo valve 93 and a water amount sensor 88 in order from the upstream side. The upstream side and the downstream side of the hot water supply heat exchanger 82 are connected by a heat source bypass pipe 89, and the heat source bypass pipe 89 is provided with a heat source bypass valve 90 for adjusting the opening degree of the heat source bypass pipe 89. Yes. The hot water supply heat exchanger 82 is provided with an electric heater 94 for preventing freezing.

  A heat exchanger hot water temperature sensor 91 is provided near the outlet of the hot water supply heat exchanger 82 of the hot water discharge pipe 13, and a heat source hot water temperature sensor 92 is provided downstream of the location where the hot water supply pipe 13 is connected to the heat source bypass pipe. Yes. Further, an auxiliary heat source outside air temperature sensor 95 for detecting the ambient temperature (outside air temperature) of the auxiliary heat source unit 80 is provided.

  Further, the auxiliary heat source unit 80 includes an auxiliary heat source controller 130 that controls the overall operation of the auxiliary heat source unit 80. The auxiliary heat source controller 130 is an electronic circuit unit including a CPU, a memory, various interface circuits, etc. (not shown), and the operation of the auxiliary heat source unit 80 is executed by executing a control program for the auxiliary heat source unit 80 held in the memory. And functions as a freeze prevention control unit 132 and an auxiliary heat source outside air temperature transmission unit 133 which will be described later.

  The auxiliary heat source controller 130 is connected to the remote controller 140 via a communication cable 152. The remote controller 140 includes a display 141 for displaying the operation status of the hot water storage type hot water supply apparatus 1 and the setting of operation conditions, and a switch unit 142 provided with various switches. A user of the hot water storage type hot water supply apparatus 1 sets the hot water supply temperature (target hot water supply temperature) from the hot water supply port 31 by operating the switch unit 142 of the remote controller 140.

  The hot water storage controller 100 and the heat pump controller 120 are connected by a communication cable 151 and communicate with each other. The hot water storage controller 100 and the auxiliary heat source controller 130 are connected by a communication cable 150 and communicate with each other.

  Next, the hot water storage unit 10 and the auxiliary heat source unit 80 may be installed integrally with a case where they are installed separately. In the present embodiment, as shown in FIG. Yes. With reference to the front view of FIG. 2A and the right side view of FIG. 2B, the auxiliary heat source unit 80 and the hot water storage unit 10 are connected back and forth in the housing 200.

  The auxiliary heat source unit 80 is placed on a support base (not shown), and the front surface of the housing 200 is closed by a front lower cover 201. The side surface of the housing 200 is closed by an upper right cover 210 and a lower right cover 211, and an upper left cover 212 and a lower left cover 213. Further, referring to the rear view of FIG. 2C, the rear surface of the housing 200 is closed by a rear upper cover 220 and a rear lower cover 221.

  Here, the auxiliary heat source outside air temperature sensor 95 of the auxiliary heat source unit 80 is provided at the bottom of the auxiliary heat source unit 80, and the auxiliary heat source outside air temperature sensor 95 includes a front lower cover 201, a right lower cover 211, and a lower left cover. 213 and the lower back cover 221. On the other hand, the first tank outside air temperature sensor 35 is provided outside the lower right cover 211, and the second tank outside air temperature sensor 36 is provided outside the bottom surface of the casing.

  Therefore, for the auxiliary heat source outside air temperature sensor 95, the detection accuracy of the outside air temperature may be lowered due to the influence of heat retention in the housing 200 or the like. On the other hand, since the first tank outside air temperature sensor 35 and the second tank outside air temperature sensor 36 are provided outside the casing 200, the outside air temperature can be detected with relatively high accuracy.

  Next, the cooperative operation of the hot water storage unit 10, the heat pump unit 50, and the auxiliary heat source unit 80 will be described with reference to FIG.

  The hot water storage controller 100 communicates with the heat pump controller 120 and the auxiliary heat source controller 130 via the tank communication circuit 101. In the hot water storage controller 100, a hot water tap (not shown) connected through the hot water supply port 31 is opened, and water of a minimum operating flow rate (for example, 2.4 liter / min) or more is supplied to the water supply pipe 12. Is detected by the total flow rate (total detection flow rate) of the detection flow rate of the hot water flow rate sensor 27 and the detection flow rate of the water flow rate sensor 23, hot water at the target hot water supply temperature 31 is discharged. Perform hot water operation.

  The hot water storage controller 100 also monitors the hot water storage tank 11 for hot water. When the hot water storage tank 11 has not run out (when the temperature detected by the tank temperature sensor 17 is equal to or higher than the hot water judgment temperature), the water amount servo valve 93 is closed and the hot water bypass valve 29 is turned on. Open the valve.

  Then, the hot water storage controller 100 detects the detected temperature Th of the tank hot water temperature sensor 26 (temperature of hot water supplied from the hot water storage tank 11 to the hot water pipe 13) and the detected flow rate Fh of the hot water flow rate sensor 27 (hot water pipe from the hot water storage tank 11). 13), the detected temperature Tw of the feed water temperature sensor 22 (the temperature of the water supplied from the feed water bypass pipe 34 to the hot water pipe 13), and the detected flow rate Fw of the water side flow sensor 23 (feed water bypass). Hot water supply so that hot water having a target hot water supply temperature is supplied to the hot water discharge pipe 13 from the connection point X between the hot water supply pipe 13 and the hot water supply bypass pipe 34 based on the flow rate of water supplied from the pipe 34 to the hot water supply pipe 13. The mixing valve 21 executes “mixing temperature control” for setting a mixing ratio between hot water supplied from the hot water storage tank 11 to the hot water discharge pipe 13 and water supplied from the water supply bypass pipe 34 to the hot water discharge pipe 13.

  On the other hand, when the hot water storage tank 11 has run out, the hot water controller 100 closes the hot water bypass valve 29 and opens the water amount servo valve 93, and connects the hot water mixing valve 21 from the water supply bypass pipe 34. A setting state in which water is supplied to the hot water discharge pipe 13 is set.

  Then, the hot water storage controller 100 permits the operation of the auxiliary heat source unit 80 so that the temperature detected by the heat source hot water temperature sensor 92 becomes the target hot water temperature. The temperature of water supplied to the pipe 13) and the detected flow rate Fw of the water amount sensor 88 (flow rate of water supplied from the water supply bypass pipe 34 to the hot water discharge pipe 13) and the combustion amount of the hot water supply burner 81 and the heat source bypass “Heating temperature control” for adjusting the opening of the valve 90 and the opening of the water amount servo valve 93 is executed.

  When the boiling-up instruction transmission unit 102 of the hot-water storage controller 100 detects that the hot-water storage tank 11 has run out, the boiling-up instruction transmission unit 102 causes the heat pump controller 120 to boil the hot water in the hot-water storage tank 11 to a predetermined boiling point. The boiling instruction data for instructing the execution of the boiling operation for heating to the temperature is transmitted.

  The hot water storage controller 100 detects that the hot water has run out, (1) the hot water supply burner 81 of the auxiliary heat source unit 80 has burned, and (2) the temperature detected by the tank temperature sensors 14-17 of the hot water storage tank 11 is higher than the target hot water temperature. (3) the temperature of the hot water from the hot water storage tank 11 detected by the tank hot water temperature sensor 26 is determined to be lower than the target hot water supply temperature.

  The hot water storage controller 100 instructs the boiling temperature to be higher than the target hot water supply temperature (for example, 40 ° C., 45 ° C., 50 ° C., and 55 ° C.) based on the boiling instruction data. For example, when the target hot water supply temperature is set to 40 ° C. by the remote controller 140, the hot water storage controller 100 sets the boiling temperature to 45 ° C.

  In addition, the tank outside air temperature transmission unit 103 of the hot water storage controller 100 receives the detected temperature To2 from the first tank outside air temperature sensor 35, the detected temperature To3 from the second tank outside air temperature sensor 36, and the outside of the auxiliary heat source received from the auxiliary heat source controller 130. Among the detected temperatures To4 of the auxiliary heat source outside air temperature sensor 95 recognized from the air temperature data, data indicating the lowest temperature Toj1 is used as the first tank outside air temperature data (corresponding to the tank outside air temperature data of the present invention). It transmits to the controller 120.

  Note that the lower one of the detected temperature To2 of the first tank outside air temperature sensor 35 and the detected temperature To3 of the second outside air temperature sensor 36 is shown without using the detected temperature To4 of the auxiliary heat source outside air temperature sensor 95. The data may be transmitted to the heat pump controller 120 as the first tank outside air temperature data.

  Further, the tank outside air temperature transmitting unit 103 receives data indicating a lower detected temperature Toj2 among the detected temperature To2 of the first tank outside air temperature sensor 35 and the detected temperature To3 of the second tank outside air temperature sensor 36. The second tank outside air temperature data is transmitted to the auxiliary heat source controller 130.

  Next, the heat pump controller 120 is operated by the heat pump communication circuit 121 and the power supply control circuit 123 that are always supplied with power from the power supply 122 during operation of the hot water storage hot water supply device 1 and the control signal from the power supply control circuit 123. A power supply switching circuit 124 that switches between a conduction state and a cutoff state, and a heat pump control circuit 125 that is supplied with power via the power supply switching circuit 124 are provided.

  The heat pump controller 120 communicates with the hot water storage controller via the heat pump communication circuit 121. When the power supply control circuit 123 receives the boiling-up instruction data from the hot water storage controller 100, the power supply switching circuit 124 is switched from the shut-off state to the conductive state, and the heat pump control circuit 125 is set in the operating state, and the execution of the boiling-up operation is instructed. To do.

  In response to the instruction to perform the boiling operation, the heat pump control circuit 125 activates the heat pump 51 and the tank circulation pump 66 and performs a boiling operation in which the hot water in the hot water storage tank 11 is boiled and heated to a temperature. When the boiling operation is completed, the power supply control circuit 123 switches the power supply switching circuit 124 from the conduction state to the cutoff state, and stops the power supply to the heat pump control circuit 125.

  Further, when the power supply control circuit 123 receives the first tank outside air temperature data from the hot water storage controller 100, the temperature Toj1 indicated by the first tank outside air temperature data becomes the first freezing determination temperature (for example, 6 ° C.). , Which corresponds to the freezing determination temperature of the present invention). When Toj1 is lower than the first freezing determination temperature, the power supply control circuit 123 switches the power supply switching circuit 124 from the cut-off state to the conductive state, operates the heat pump control circuit 125, and prevents the heat pump unit 50 from freezing. A freeze prevention preparation instruction signal for instructing preparation for operation is transmitted.

  The heat pump control circuit 125 that has received the freeze prevention preparation instruction signal determines whether or not the detected temperature To1 of the heat pump outside air temperature sensor 67 is lower than the second freezing determination temperature (for example, 6 ° C.).

  When To1 is lower than the second freezing determination temperature, the heat pump control circuit 125 executes the antifreezing operation of the heat pump unit 50. Specifically, the heat pump control circuit 125 first operates the tank circulation pump 66. Even when 30 minutes have elapsed since the start of the operation of the tank circulation pump 66, the temperature of the water in the tank circulation path 41 (detected by the hot water temperature sensors 68 and 69) is less than 8 ° C., and the heat pump outside air temperature sensor When the detected temperature To1 of 67 is lower than the second freezing determination temperature, the heat pump 51 is further operated.

  On the other hand, when To1 is equal to or higher than the second freezing determination temperature, the heat pump control circuit 125 determines that the heat pump freeze prevention operation is unnecessary.

  The operation of the tank circulation pump 66 is controlled by a tank circulation pump control circuit provided separately from the heat pump control circuit 125, and when the first tank outside air temperature data is received from the hot water storage tank controller 100, The pump control circuit determines whether or not the temperature Toj1 indicated by the first tank outside air temperature data is lower than the first freezing determination temperature, and when Toj1 is lower than the first freezing determination temperature, the tank circulation The pump 66 may be operated.

  The power supply control circuit 123 supplies power to the heat pump control circuit 125 with the power switching circuit shut off when the heat pump freeze prevention operation by the heat pump control circuit 125 is completed and when it is determined that the heat pump freeze prevention operation is unnecessary. To stop.

  As described above, the power supply control circuit 123 sets the power supply switching circuit 124 in the conductive state only when performing the boiling operation, the determination of the necessity of the heat pump freeze prevention operation, and the heat pump freeze prevention operation, and the heat pump control circuit 125. In addition, power is supplied to the heat pump outside air temperature sensor 67. Therefore, standby power of the heat pump controller 120 can be reduced.

  Further, the heat pump control circuit 125 uses the detected temperature To1 of the heat pump outside air temperature sensor 67 provided in the heat pump unit 50, so that the hot water storage unit 10 may be installed in a place (indoors etc.) away from the heat pump unit 50. The freezing of the heat pump unit 50 is more than when using the detection temperatures To2 and To3 of the first tank outside air temperature sensor 35 and the second tank outside air temperature sensor 36, or the detection temperature To4 of the auxiliary heat source outside air temperature sensor 95 of the auxiliary heat source unit 80. The necessity of the prevention operation can be determined with high accuracy.

  Therefore, the start timing of the freeze prevention operation of the heat pump unit 50 can be delayed, and unnecessary power consumption can be prevented from being consumed by performing the unnecessary freeze prevention operation of the heat pump unit 50.

  When the lower one of the temperature Toj1 indicated by the first tank outside air temperature data and the detected temperature To1 of the heat pump outside air temperature sensor 67 is lower than the second freezing determination temperature, the heat pump unit 50 The anti-freezing operation may be executed.

  Next, the auxiliary heat source controller 130 communicates with the hot water storage controller 100 through the auxiliary heat source communication circuit 131. The auxiliary heat source controller 130, when the operation is permitted by the hot water storage controller 100, the combustion amount of the hot water supply burner 81 and the opening of the heat source bypass valve 90 so that the detected temperature of the heat source hot water temperature sensor 92 becomes the target hot water temperature. Adjust.

  Further, the auxiliary heat source outside air temperature transmission unit 133 always transmits auxiliary heat source outside air temperature data indicating the detected temperature To4 of the auxiliary heat source outside air temperature sensor 95 to the hot water storage controller 100 (for each control cycle of the hot water storage controller 100).

  The anti-freezing control unit 132 determines that the lower one of the temperature Toj2 recognized from the second tank outside air temperature data received from the hot water storage controller 100 and the detected temperature To4 of the auxiliary heat source outside air temperature sensor 95 is the third anti-freezing. It is determined whether or not the temperature is lower than the determination temperature. When the lower temperature is lower than the third anti-freezing determination temperature, an anti-freezing operation in which the electric heater 94 is energized to heat the hot water supply heat exchanger 82 is executed.

  Here, as described with reference to FIGS. 2A to 2C, the auxiliary heat source outside air temperature sensor 95 of the auxiliary heat source unit 80 is surrounded by the front lower cover 201, the right lower cover 211, and the lower left part. Since it is surrounded by the cover 213 and the lower back cover 221, heat may be trapped around the auxiliary heat source outside air temperature sensor 95. In this case, the outside air temperature around the auxiliary heat source unit 80 is detected with high accuracy. I can't.

  In contrast, the first tank outside air temperature sensor 35 of the hot water storage unit 10 is provided outside the lower right cover 211, and the second tank outside air temperature sensor 36 is provided outside the bottom surface of the housing 200. Therefore, the outside air temperature around the auxiliary heat source unit 80 can be accurately detected without being easily affected by heat accumulation or the like.

  Therefore, the freeze prevention control unit 132 is based on the lower one of the temperature Toj2 recognized from the second tank outside air temperature data received from the hot water storage controller 100 and the detected temperature To4 of the auxiliary heat source outside air temperature sensor 95. It is determined whether or not the temperature is lower than the third freezing prevention determination temperature of the auxiliary heat source unit 80.

  Thus, the start timing of the freeze prevention operation of the auxiliary heat source unit 80 is delayed, and unnecessary power is prevented from being consumed due to the execution of the unnecessary freeze prevention operation of the auxiliary heat source unit 80. it can.

  In the present embodiment, the hot water storage type hot water supply device 1 provided with the auxiliary heat source unit 80 is shown, but the present invention can also be applied to a hot water storage type hot water supply device that does not include the auxiliary heat source unit 80. .

  In the present embodiment, the auxiliary heat source unit 80 using gas as fuel is shown as the auxiliary heat source unit, but other types of auxiliary heat source devices such as a heat source unit using other fuels such as oil and an electric heater are used. May be.

  Further, in the present embodiment, an example in which two tank outside air temperature sensors (first tank outside air temperature sensor 35 and second tank outside air temperature sensor 36) having different installation locations are shown, but three or more tank outside air sensors are provided. A temperature sensor may be provided, and tank outside air temperature data indicating the lowest detected temperature may be transmitted to the heat pump controller 120. Further, one tank outside air temperature sensor may be provided, and tank outside air temperature data indicating the detected temperature of the tank outside air temperature sensor may be transmitted to the heat pump controller 120.

  DESCRIPTION OF SYMBOLS 1 ... Hot water storage type hot water supply apparatus, 10 ... Hot water storage unit, 11 ... Hot water storage tank, 12 ... Water supply pipe, 13 ... Hot water supply pipe, 21 ... Hot water supply mixing valve, 26 ... Tank hot water temperature sensor, 28 ... Mixed temperature sensor, 29 ... Hot water bypass Valve: 33 ... Hot water bypass pipe, 34 ... Feed water bypass pipe, 50 ... Heat pump unit, 80 ... Auxiliary heat source unit, 100 ... Hot water storage controller, 101 ... Tank communication circuit, 102 ... Boil-up instruction transmitter, 103 ... Tank outside air temperature transmission , 120 ... heat pump controller, 121 ... heat pump communication circuit, 123 ... power supply control circuit, 124 ... power supply switching circuit, 125 ... heat pump control circuit, 130 ... auxiliary heat source controller, 131 ... auxiliary heat source communication circuit, 132 ... freeze prevention control Part, 133 ... auxiliary heat source outside air temperature transmission part.

And the hot water storage type hot water supply apparatus of the present invention is
A hot water storage unit having a hot water storage tank;
A hot water storage type hot water supply apparatus having a heat pump unit for heating hot water in the hot water storage tank by a heat pump,
The hot water storage unit is
A tank communication circuit for communicating with the heat pump unit;
A tank outside air temperature sensor for detecting the ambient temperature of the hot water storage unit;
A tank outside air temperature data indicating a temperature detected by the tank outside air temperature sensor, and a tank outside air temperature transmitter for transmitting to the heat pump unit,
The heat pump unit is
A heat pump communication circuit for communicating with the hot water storage unit;
A heat pump outside air temperature sensor for detecting the ambient temperature of the heat pump unit;
A heat pump control circuit connected to the heat pump outside air temperature sensor to control the operation of the heat pump;
A power supply switching circuit that switches between supply and interruption of power to the heat pump control circuit;
When the tank outside air temperature data is received from the hot water storage unit, it is determined whether the temperature indicated by the tank outside air temperature data is equal to or lower than a predetermined freezing determination temperature, and the temperature is equal to or lower than the freezing determination temperature. Sometimes, as a state in which power is supplied to the heat pump control circuit by the power supply switching circuit, the heat pump control circuit is caused to execute the freeze prevention operation of the heat pump unit based on the detected temperature of the heat pump outside air temperature sensor,
A power supply control circuit configured to shut off the power supply to the heat pump control circuit by the power switching circuit when the anti-freezing operation is not performed (first operation). 1 invention).

According to the first aspect of the present invention, when the freeze prevention operation by the heat pump unit is not performed, the power supply control circuit cuts off the power supply to the heat pump control circuit. Therefore, in the standby state, the power consumption of the heat pump unit is mainly suppressed to the power consumption of the heat pump communication circuit and the power supply control circuit, and the standby power of the heat pump unit is reduced.

When the power supply control circuit receives the tank outside air temperature data from the hot water storage unit, the power supply control circuit determines whether or not the temperature indicated by the outside air temperature data is equal to or lower than the freezing determination temperature. When the temperature is equal to or lower than the freezing determination temperature, the heat pump control circuit is caused to execute the antifreezing operation of the heat pump unit based on the temperature detected by the heat pump outside air temperature sensor. Therefore, the freeze prevention operation of the heat pump unit can be executed at an appropriate timing using the detected temperature of the heat pump outside air temperature sensor provided in the heat pump unit.

According to the third aspect of the present invention, the temperature detected by the tank outside air temperature sensor is higher than the actual outside air temperature depending on the installation state of the hot water storage unit, but the auxiliary heat source outside air temperature sensor relatively accurately determines the outside air temperature. When it is detected, the detected temperature of the auxiliary heat source outside temperature sensor can be adopted and the outside temperature data can be transmitted.

Then, the hot water storage controller 100 permits the operation of the auxiliary heat source unit 80 so that the temperature detected by the heat source hot water temperature sensor 92 becomes the target hot water temperature. The temperature of water supplied to the pipe 13) and the detected flow rate Fw of the water-side flow rate sensor 23 (flow rate of water supplied from the feed water bypass pipe 34 to the hot water pipe 13), “Heating temperature control” for adjusting the opening of the heat source bypass valve 90 and the opening of the water amount servo valve 93 is executed.

Hot water storage controller 10 0, when detecting the hot water out of the hot water storage tank 11, the instruction transmitting unit 102 up boiling, boiling heat against the heat pump controller 120, the hot water in the hot water storage tank 11 to a predetermined boil up temperature raising Boil-up instruction data for instructing execution of operation is transmitted.

The heat pump controller 120 communicates with the hot water storage controller 100 via the heat pump communication circuit 121. When the power supply control circuit 123 receives the boiling-up instruction data from the hot water storage controller 100, the power supply switching circuit 124 is switched from the shut-off state to the conductive state, and the heat pump control circuit 125 is set in the operating state, and the execution of the boiling-up operation is instructed. To do.

Incidentally, the operation of the tank circulating pump 66, the heat pump control circuit 125 is configured to be controlled by separately provided tank circulation pump control circuit, upon receiving the first tank outside air temperature data from the savings Yuko controller 100, tank The circulation pump control circuit determines whether or not the temperature Toj1 indicated by the first tank outside air temperature data is lower than the first freezing determination temperature, and when Toj1 is lower than the first freezing determination temperature, the tank The circulation pump 66 may be operated.

Freeze prevention control unit 132 includes a temperature Toj2 recognized from the second tank outside air temperature data received from the hot water storage controller 100, the temperature of the lower of the detected temperature To4 the auxiliary heat source outside air temperature sensor 95, the third frozen to determine whether or not it is lower than determine constant temperature. Then, the temperature of the lower is when is lower than the third freeze-size constant temperature performs freeze prevention operation for heating the hot water supply heat exchanger 82 by energizing the electric heater 94.

Therefore, the freeze prevention control unit 132 is based on the lower one of the temperature Toj2 recognized from the second tank outside air temperature data received from the hot water storage controller 100 and the detected temperature To4 of the auxiliary heat source outside air temperature sensor 95. determining whether is lower than the third freeze-size constant temperature of the auxiliary heat source unit 80.

In the present embodiment, the auxiliary heat source unit 80 using gas as a fuel is shown as the auxiliary heat source unit. However, other types of auxiliary heat source units such as a heat source unit using another fuel such as oil or an electric heater are used. May be.

Claims (4)

A hot water storage unit having a hot water storage tank;
A hot water storage type hot water supply apparatus having a heat pump unit for heating hot water in the hot water storage tank by a heat pump,
The hot water storage unit is
A tank communication circuit for communicating with the heat pump unit;
A tank outside air temperature sensor for detecting the ambient temperature of the hot water storage unit;
A tank outside air temperature data indicating a temperature detected by the tank outside air temperature sensor, and a tank outside air temperature transmitter for transmitting to the heat pump unit,
The heat pump unit is
A heat pump communication circuit for communicating with the hot water storage unit;
A heat pump outside air temperature sensor for detecting the ambient temperature of the heat pump unit;
A heat pump control circuit connected to the heat pump outside air temperature sensor to control the operation of the heat pump;
A power supply switching circuit that switches between supply and interruption of power to the heat pump control circuit;
When the tank outside air temperature data is received from the heat pump unit, it is determined whether or not the temperature indicated by the outside air temperature data is equal to or lower than a predetermined freezing determination temperature, and when the temperature is equal to or lower than the freezing determination temperature As a state in which power is supplied to the heat pump control circuit by the power supply switching circuit, the heat pump control circuit is caused to execute the freeze prevention operation of the heat pump unit based on the detected temperature of the heat pump outside air temperature sensor,
A hot water storage system comprising: a power supply control circuit configured to shut off power supply to the heat pump control circuit by the power supply switching circuit when the freeze prevention operation is not performed Hot water supply device. In the hot water storage type hot water supply apparatus according to claim 1,
The hot water storage unit includes a plurality of temperature sensors having different installation locations as the tank outside air temperature sensor,
The tank outside air temperature transmitting unit transmits data indicating the lowest detected temperature among the detected temperatures of the plurality of temperature sensors to the heat pump unit as the tank outside air temperature data. . In the hot water storage type hot water supply apparatus according to claim 1,
An auxiliary heat source machine that is connected to the hot water storage tank and is provided in the middle of the hot water supply pipe to which hot water in the hot water storage tank is supplied, and that heats the hot water flowing through the hot water supply pipe;
An auxiliary heat source outside air temperature sensor for detecting the ambient temperature of the auxiliary heat source unit;
An auxiliary heat source communication circuit for communicating with the hot water storage unit;
An auxiliary heat source unit having an auxiliary heat source outside air temperature transmission unit that transmits auxiliary heat source outside air temperature data indicating the detection temperature of the auxiliary heat source outside air temperature sensor to the hot water storage unit;
The tank communication circuit communicates with the auxiliary heat source unit,
The tank outside temperature transmitter transmits data indicating a lower one of the temperature indicated by the auxiliary heat source outside temperature data and the detected temperature of the tank outside temperature sensor as the tank outside temperature data. A hot water storage type hot water supply device that transmits to a heat pump unit. In the hot water storage type hot water supply device according to claim 3,
The hot water storage unit includes a plurality of temperature sensors as the tank outside air temperature sensor,
The tank outside air temperature transmission unit uses, as the tank outside air temperature data, data indicating the lowest temperature among the temperature indicated by the auxiliary heat source outside air temperature data and the detected temperatures of the plurality of temperature sensors as the heat pump unit. A hot water storage type hot water supply device characterized by being transmitted to

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