JP2013224809A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type water heater which prevents delay in start timing of an antifreezing operation of an auxiliary heat source unit when a hot water storage unit and the auxiliary heat source unit are integrated for installation.SOLUTION: A hot water storage unit 10 includes an outside tank air temperature transmission portion 103 which transmits, to an auxiliary heat source unit 80, outside tank air temperature data indicating a lower temperature in detected temperatures detected by a first outside tank air temperature sensor 35 or a second outside tank air temperature sensor 36. The auxiliary heat source unit 80 includes a freezing preventive control portion 132 which, when receiving the outside tank air temperature data, determines whether a temperature indicated by the outside tank air temperature data or a detected temperature by the auxiliary heat source outside air temperature sensor 95 is lower than a freezing determination temperature or not, and executes a freezing preventive operation of the auxiliary heat source unit 80.

Description

  The present invention relates to a hot water storage type hot water supply apparatus in which a hot water storage unit having a hot water storage tank and an auxiliary heat source unit for heating hot water supplied from the hot water storage tank are integrated.

  Conventionally, in a heat source unit, an electric heater is installed in a heat exchanger or a water passage near the heat exchanger, and the electric heater is turned on / off by a temperature detector to prevent the water passage from freezing in winter. (For example, refer to Patent Document 1). In the heat source unit described in Patent Document 1, the electric heater is ON / OFF controlled by a temperature detector whose operating temperature is set to 0 ° C.

  There is also known a hot water storage type hot water supply apparatus in which a hot water storage unit and an auxiliary heat source unit that heats hot water supplied from the hot water storage unit are integrated and installed (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 4-24353 JP 2011-158129 A

  When the hot water storage unit and the auxiliary heat source unit are installed in an integrated manner, as in the hot water storage type hot water supply apparatus described in Patent Document 2, the hot water storage unit and the integrated are installed around the outside temperature sensor provided in the auxiliary heat source unit. The accompanying connection member may be arrange | positioned.

  In this case, the air around the outside air temperature sensor becomes difficult to flow, and heat from the auxiliary heat source unit or the hot water storage tank unit may stay around the outside air temperature sensor. As a result, the temperature detected by the outside air temperature sensor of the auxiliary heat source unit becomes higher than the actual outside air temperature, and the start timing of the freeze prevention operation of the auxiliary heat source unit may be delayed.

  The present invention has been made in view of the above background, and when a hot water storage unit and an auxiliary heat source unit are integrally installed, a hot water storage type hot water supply apparatus that prevents the start timing of the freeze prevention operation of the auxiliary heat source unit from being delayed is prevented. The purpose is to provide.

  The present invention has been made to achieve the above object, and includes a hot water storage unit having a hot water storage tank to which a hot water discharge pipe is connected, an auxiliary heat source unit for heating hot water supplied from the hot water storage unit, and the hot water storage unit. The present invention relates to a hot water storage type hot water supply apparatus including a connecting portion that integrally connects the auxiliary heat source unit.

And the hot water storage type hot water supply apparatus of the present invention is
The hot water storage unit is
A tank communication circuit for communicating with the auxiliary heat source unit;
A tank outside air temperature sensor for detecting the ambient temperature of the hot water storage unit;
A tank outside air temperature transmission unit for transmitting tank outside air temperature data indicating a detection temperature of the tank outside air temperature sensor to the auxiliary heat source unit;
The auxiliary heat source unit is
An auxiliary heat source communication circuit for communicating with the hot water storage unit;
An auxiliary heat source outside air temperature sensor for detecting an ambient temperature of the auxiliary heat source unit;
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 or the temperature detected by the auxiliary heat source outside air temperature sensor is lower than a predetermined freezing determination temperature. An anti-freezing control unit for performing the anti-freezing operation of the auxiliary heat source unit when the temperature indicated by the tank outside air temperature data or the detected temperature of the auxiliary heat source outside air temperature sensor is lower than the freezing determination temperature. (First invention).

  According to the first invention, the freeze prevention control unit, when the temperature indicated by the tank outside air temperature data received from the hot water storage unit or the detected temperature of the auxiliary heat source outside air temperature sensor is lower than the freezing determination temperature, The freeze prevention operation of the auxiliary heat source unit is executed. Therefore, even if the detection accuracy of the outside air temperature by the auxiliary heat source outside temperature sensor is low, if the outside air temperature detection accuracy by the tank outside air temperature sensor is high, the outside air detected by the tank outside air temperature sensor Based on the temperature, it is possible to accurately determine whether or not the auxiliary heat source unit needs to be prevented from freezing. Therefore, it is possible to prevent the execution timing of the anti-freezing operation of the auxiliary heat source unit from being delayed due to a decrease in the outside air temperature detection accuracy by the auxiliary heat source outside air temperature sensor.

In the first invention,
The auxiliary heat source outside air temperature sensor is arranged with its periphery closed by a cover part,
The tank outside air temperature sensor is arranged to be exposed to the outside air,
The freeze prevention control unit, when receiving the tank outside air temperature data from the hot water storage unit, determines whether or not the temperature indicated by the tank outside air temperature data is lower than the freezing determination temperature, and the tank outside air When the temperature indicated by the temperature data is lower than the freeze determination temperature, the freeze prevention operation is executed (second invention).

  According to the second invention, since the auxiliary heat source outside air temperature sensor is arranged with the periphery thereof closed by the cover portion, the detection accuracy of the outside air temperature is likely to be lowered due to hot air retention or the like. . On the other hand, since the tank outside air temperature sensor is disposed so as to be exposed to the outside air, the outside air temperature can be detected with higher accuracy than the auxiliary heat source outside air temperature sensor. Therefore, in this case, it is possible to accurately determine whether or not the auxiliary heat source unit needs to be frozen based only on the temperature detected by the tank outside air temperature sensor.

In the first invention or the second invention,
The hot water storage unit includes a plurality of temperature sensors with 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 auxiliary heat source unit as the tank outside air temperature data (third). invention).

  According to the third aspect of the present invention, the difference between the detected temperature of the tank outside air temperature sensor and the actual outside air temperature, which may occur depending on the installation status of the hot water storage unit, is suppressed, and whether or not the auxiliary heat source unit needs to be prevented from freezing is determined. Judgment can be made.

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 (corresponding to the tank outside air temperature sensor of the present invention) for detecting the ambient temperature (outside air temperature) of the hot water storage unit 10 and a second tank outside air temperature sensor 36 (the tank of the present invention). Corresponding to an outside air temperature sensor).

  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 in the vicinity of 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 89. ing. 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 are integrally installed as shown in FIG. Referring 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 moved back and forth in the housing 200 (corresponding to the connecting portion of the present invention). Are connected.

  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. The front lower cover 201, the right lower cover 211, the left lower cover 213, and the rear lower cover 221 correspond to the cover portion of the present invention.

  On the other hand, the first tank outside air temperature sensor 35 is provided exposed outside the lower right cover 211, and the second tank outside air temperature sensor 36 is provided exposed outside the bottom surface of the housing 200. .

  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, the first tank outside air temperature sensor 35 and the second tank outside air temperature sensor 36 are provided so as to be exposed to the outside of the housing 200, so that 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, the water amount servo valve 93 is closed and the hot water bypass valve 29 is opened.

  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. Of the detected temperature To4 of the auxiliary heat source outside air temperature sensor 95 recognized from the temperature data, data indicating the lowest temperature Toj1 is 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 (corresponding to the tank outside air temperature data of the present invention) 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 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.

  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. When the first tank outside air temperature data is received from the hot water storage controller 100, the tank circulation pump The control circuit determines whether or not the temperature Toj1 indicated by the first tank outside air temperature data is lower than the first antifreezing temperature, and when Toj1 is lower than the first freezing determination temperature, the tank circulation pump 66 may be activated.

  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, the power supply control circuit 123 sets the power switch circuit 124 to the shut-off state and supplies power to the heat pump control circuit 125. Stop supplying.

  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. In this determination, only the temperature Toj2 may be used.

  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 apparatus 1 that heats the hot water in the hot water storage tank 11 by the heat pump unit 50 is shown. However, the hot water in the hot water storage tank 11 is supplied by other types of heating means such as an electric heater. The present invention can also be applied to a hot water storage type hot water supply apparatus that heats up.

  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.

  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.

Claims (3)

A hot water storage unit having a hot water storage tank connected to the hot water pipe;
An auxiliary heat source unit for heating hot water supplied from the hot water storage unit;
A hot water storage type hot water supply apparatus having a connecting portion that integrally connects the hot water storage unit and the auxiliary heat source unit,
The hot water storage unit is
A tank communication circuit for communicating with the auxiliary heat source unit;
A tank outside air temperature sensor for detecting the ambient temperature of the hot water storage unit;
A tank outside air temperature transmission unit for transmitting tank outside air temperature data indicating a detection temperature of the tank outside air temperature sensor to the auxiliary heat source unit;
The auxiliary heat source unit is
An auxiliary heat source communication circuit for communicating with the hot water storage unit;
An auxiliary heat source outside air temperature sensor for detecting an ambient temperature of the auxiliary heat source unit;
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 or the temperature detected by the auxiliary heat source outside air temperature sensor is lower than a predetermined freezing determination temperature. And an anti-freezing control unit that executes an anti-freezing operation of the auxiliary heat source unit when the temperature indicated by the tank outside air temperature data or the detected temperature of the auxiliary heat source outside air temperature sensor is lower than a predetermined freezing determination temperature. A hot water storage hot water supply device characterized by that. In the hot water storage type hot water supply apparatus according to claim 1,
The auxiliary heat source outside air temperature sensor is arranged with its periphery closed by a cover part,
The tank outside air temperature sensor is arranged to be exposed to the outside air,
The freeze prevention control unit, when receiving the tank outside air temperature data from the hot water storage unit, determines whether or not the temperature indicated by the tank outside air temperature data is lower than the freezing determination temperature, and the tank outside air When the temperature indicated by the temperature data is lower than the freezing determination temperature, the antifreezing operation is executed. In the hot water storage type hot water supply apparatus according to claim 1 or claim 2,
The hot water storage unit includes a plurality of temperature sensors with 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 auxiliary heat source unit as the tank outside air temperature data. apparatus.

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