JP6143092B2 - Hot water storage system - Google Patents

Description

  The present invention relates to a hot water storage hot water supply apparatus, and more particularly to an apparatus for reheating hot water using a combustion type auxiliary heat source device when the hot water temperature of a hot water storage tank is lowered.

  2. Description of the Related Art Conventionally, hot water storage and hot water supply apparatuses that generate and store hot water and supply hot water to a desired hot water supply destination have been put to practical use. This type of hot water storage and hot water supply system has a hot water storage tank for storing hot water, various valve members and various pipes, and an auxiliary heat source for reheating when the temperature of the hot water stored in the hot water storage tank is low. Machine, an external case containing these devices, an external heat source machine for generating high-temperature water, and the like.

  By the way, when the auxiliary heat source unit is operated to reheat the hot water in the hot water storage tank, the high temperature water flowing from the auxiliary heat source unit into the hot water supply passage bypasses the auxiliary heat source device and flows into the hot water supply passage from the hot water storage tank. The hot water may be mixed with hot water, and the hot spring characteristics may deteriorate. In order to solve this problem, in the case of a structure where a pressure pump is installed in the passage through the auxiliary heat source unit, the output capacity of the pressure pump is increased so that a small amount of high-temperature water from the auxiliary heat source unit is always sent to the hot water storage tank side. By controlling to flow, low temperature hot water is prevented from flowing into the hot water supply passage from the hot water storage tank side, and deterioration of the hot water discharge characteristic is prevented.

  As a technique for returning the high-temperature water generated by the auxiliary heat source device to the hot water storage tank side, for example, in the hot water supply system of Patent Document 1, an auxiliary heat source device, a passage connecting the hot water storage tank to the auxiliary heat source device, and an auxiliary heat source A loop circulation circuit is constructed from the passage connecting from the machine to the hot water supply passage and the passage connecting directly from the upper part of the hot water storage tank to the hot water supply passage, and after the hot water supply operation using the auxiliary heat source machine is completed, A technique is also disclosed in which the operation of the auxiliary heat source unit is continued for a certain period of time and the high temperature water is returned to the hot water storage tank side by circulating the high temperature water to the loop circulation circuit.

JP 2012-72952 A

  However, if the high-temperature water generated by the auxiliary heat source unit is returned to the hot water storage tank side during the hot water supply operation using the auxiliary heat source unit, the returned hot water is transferred from the upper part of the hot water storage tank to the auxiliary heat source unit. Since the temperature of hot water flowing into the auxiliary heat source unit rises when mixed with flowing hot water, the heat exchange efficiency of the auxiliary heat source unit decreases, and it is necessary to increase the output of the pressure pump to return hot water to the hot water storage tank side. Therefore, there is a problem that the power consumption of the pressure pump increases and the operating efficiency of the hot water storage hot water supply device decreases.

  Moreover, if the technique which circulates the hot water heated with the auxiliary heat source machine to a loop-shaped circulation circuit like the hot-water supply system of patent document 1, it will produce the high temperature water which does not contribute to hot water supply, Operating efficiency is reduced.

  By the way, since the operation determination of the auxiliary heat source unit is performed by the hot water temperature detection sensor installed at the upper part of the hot water storage tank, there is a possibility that hot water that can be supplied with hot water remains above the hot water temperature detection sensor of the hot water storage tank. There is. It is desirable to utilize the hot water remaining in the hot water storage tank that can supply hot water as effectively as possible.

  The objective of this invention is providing the thing etc. which can prevent the fall of the heat exchange efficiency of an auxiliary heat source machine in a hot water storage hot-water supply apparatus.

  The hot water storage and hot water supply apparatus according to claim 1 includes a tank hot water passage connected from the upper part of the hot water storage tank to the hot water supply passage, an auxiliary heating passage branched from the tank hot water passage and connected to a combustion type auxiliary heat source device, and the auxiliary heating passage. In the case of supplying a hot water heated by the auxiliary heat source machine to the hot water supply passage, comprising a pumping means installed in the passage and an auxiliary heat source machine outlet hot water passage connected from the auxiliary heat source machine to the hot water supply passage, In the hot water storage hot water supply apparatus that drives the pressure feeding means so that a part of high temperature water flows from the auxiliary heat source machine hot water discharge passage to the tank hot water discharge passage, the temperature of hot water discharged from the upper part of the hot water storage tank to the tank hot water supply passage is detected. And a pressure feeding means control means for controlling the pressure feeding means in accordance with the temperature detected by the temperature detecting means.

  According to a second aspect of the present invention, there is provided the hot water storage and hot water supply apparatus according to the first aspect of the invention, wherein the pressure feeding means control means has a high temperature from the auxiliary heat source machine hot water passage to the tank hot water passage when the temperature detected by the temperature detection means is equal to or higher than a preset temperature. The pressure feeding means is controlled so that water does not flow, and when the detected temperature of the temperature detecting means becomes lower than a set temperature, a part of high temperature water flows from the auxiliary heat source machine hot water outlet passage to the tank hot water outlet passage. The pumping means is controlled.

  According to the first aspect of the present invention, the temperature detecting means for detecting the temperature of hot water discharged from the upper part of the hot water storage tank to the tank outlet passage, and the pressure feeding means for controlling the pressure feeding means in accordance with the detected temperature of the temperature detecting means. Control means so that the flow rate of hot water flowing from the auxiliary heat source machine hot water outlet passage to the tank hot water passage can be varied according to the hot water temperature discharged from the upper part of the hot water storage tank to the tank hot water outlet passage by the pressure feeding means control means. can do.

  Therefore, when hot water that can be supplied with hot water remains downstream from the temperature detecting means when the auxiliary heat source unit is operated, even if this hot water that can be supplied with hot water is mixed with the hot water generated by the auxiliary heat source device Since the hot water discharge characteristic does not deteriorate significantly, the output capacity of the pumping means is suppressed, and the high temperature water from the auxiliary heat source machine is not allowed to flow into the hot water storage tank side. Therefore, since hot water does not return to the hot water storage tank side, the temperature of hot water flowing to the auxiliary heat source machine does not rise, and it is possible to prevent the heat exchange efficiency of the auxiliary heat source machine from being lowered, while maintaining the hot water discharge characteristics. Since the power consumption of the pumping means can be reduced, the operating efficiency of the hot water storage hot water supply apparatus is improved.

  According to the invention of claim 2, the pressure feeding means control means controls the pressure feeding means so that the high temperature water does not flow from the auxiliary heat source machine hot water discharge passage into the tank hot water discharge passage when the detected temperature of the temperature detection means is equal to or higher than the set temperature. When the temperature detected by the temperature detecting means is lower than the set temperature, the pressure feeding means is controlled so that a part of the high temperature water flows from the auxiliary heat source machine hot water outlet passage to the tank hot water outlet passage. Maintaining hot water discharge characteristics as before by increasing the output capacity of the pumping means after consuming high-temperature water as much as possible and allowing some of the hot water to flow from the auxiliary heat source machine hot water passage to the tank hot water passage. can do.

It is a schematic block diagram of the hot water storage hot-water supply apparatus which concerns on the Example of this invention. It is a flowchart of hot water supply operation control.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

First, the whole structure of the hot water storage hot-water supply apparatus 1 of this invention is demonstrated.
As shown in FIG. 1, a hot water storage and hot water supply apparatus 1 has functions such as hot water storage, hot water supply, hot water supply to a hot water heating terminal such as a floor heating panel, etc., and a tank unit 1A including a hot water storage tank 2, a hot water storage An external heat source device 10 for heating hot water in the tank 2 and a hot water circulation circuit 6 for connecting the tank unit 1A and the external heat source device 10 are provided.

  The tank unit 1A includes a hot water storage tank 2, an auxiliary heat source unit 3, a heat exchanger 4 for heating, a water supply path 5, a hot water circulation circuit 6, a hot water supply path 7, a hot water heating circuit 8 for supplying heating water to a floor heating panel, etc. A heat-utilizing circuit 9 for heating the heating water of the heating circuit 8 and the like are provided, and most of them are integrally stored in the outer case 11. As the external heat source unit 10, a heat pump type heat source unit, an exhaust heat recovery heat exchanger of a fuel cell power generation unit, or the like is used.

Next, the hot water storage tank 2 will be described.
As shown in FIG. 1, the hot water storage tank 2 is composed of a sealed tank capable of storing high-temperature water (for example, 80 to 90 ° C.) heated by the external heat source unit 10, in order to prevent heat dissipation of the stored hot water. The tank is covered with insulation.

  Hot water temperature detection sensors 2a to 2d are sequentially provided on the outer peripheral portion of the hot water storage tank 2 from the lower side toward the upper side in order, and a plurality of hot water temperature detection sensors 2a to 2d are provided in the hot water storage tank 2 by the plurality of hot water storage tank hot water temperature detection sensors 2a to 2d. The temperature of the hot water in the reservoir is detected.

  The auxiliary heat source unit 3 is composed of a known gas water heater that incorporates a burner, a heat exchanger, and the like. The auxiliary heat source unit 3 is heated only when a command is transmitted from the control unit 35 in response to a special case such as when the hot water temperature in the hot water storage tank 2 is lowered, and heats the hot water.

  The heating heat exchanger 4 heats the heating water flowing through the hot water heating circuit 8, and the heat exchange passage portion 4 a that is a part of the heat utilization circulation circuit 9 and the heat that is a part of the hot water heating circuit 8. And an exchange passage portion 4b. In the heating heat exchanger 4, heat is exchanged between the high-temperature water flowing in the heat utilization circulation circuit 9 and the heating water flowing in the hot water heating circuit 8, and the heating water is heated.

Next, the water supply path 5 will be described.
As shown in FIG. 1, the water supply path 5 supplies low temperature clean water from a water supply source to the hot water storage tank 2, and has an upstream water supply passage part 5a, an intermediate water supply passage part 5b, and a downstream water supply passage part 5c. ing. An upstream end of the upstream water supply passage portion 5 a is connected to a water source, and a downstream end of the downstream water supply passage portion 5 c is connected to a lower portion of the hot water storage tank 2. A bypass passage 12 connected to the hot water supply passage 7 is branched from between the upstream water supply passage 5a and the intermediate water supply passage 5b. An open / close valve 5e is installed in the upstream water supply passage 5a, and the open / close valve 5e is normally opened so that low-temperature hot water is supplied into the hot water storage tank 2. A check valve 5d is installed in the intermediate water supply passage 5b, and a check valve 12a is installed in the bypass passage 12.

  A bypass passage 14 connected to the heat utilization circuit 9 is branched from between the intermediate water supply passage 5b and the downstream water supply passage 5c, and a heat storage switching valve 15 is installed at this branch. By this bypass passage 14, low temperature clean water can be supplied to the heat utilization circuit 9, and conversely, hot water can be returned from the heat utilization circuit 9 to the hot water storage tank 2. A drainage passage 31 connected to the outside is branched from the downstream water supply passage portion 5c, and a manual or automatic drainage valve 32 for draining the hot water storage tank 2 is installed in the drainage passage 31, and usually a drainage valve 32 is provided. Is closed.

Next, the hot water circulation circuit 6 will be described.
As shown in FIG. 1, the hot water circulation circuit 6 is a closed circuit that heats hot water by circulating it between the hot water storage tank 2 and the external heat source unit 10. It has a passage portion 6b, a downstream low temperature side circulation passage portion 6c, an upstream high temperature side circulation passage portion 6d, an outside unit high temperature side circulation passage portion 6e, a downstream high temperature side circulation passage portion 6f, and the like. The upstream end of the upstream low temperature side circulation passage portion 6 a is connected to the lower portion of the hot water storage tank 2, and the downstream end of the downstream high temperature side circulation passage portion 6 f is connected to the upper portion of the hot water storage tank 2.

  The upstream low temperature side circulation passage portion 6 a and the downstream high temperature side circulation passage portion 6 f are installed in the outer case 11. A branch passage portion 16 connected from the upstream low temperature side circulation passage portion 6a to the downstream high temperature side circulation passage portion 6f is branched, and the branch portion includes a circulation circuit including the hot water storage tank 2 and a circulation circuit bypassing the hot water storage tank 2. A three-way valve 17 that can alternatively be selected is provided. A circulation pump 18 is installed on the downstream side of the three-way valve 17 in the upstream low temperature side circulation passage portion 6a.

  The downstream low-temperature side circulation passage portion 6 c and the upstream high-temperature side circulation passage portion 6 d are installed in the exterior case 10 a of the external heat source device 10. A heat exchanging portion 10b of the external heat source device 10 is provided between the downstream low temperature side circulation passage portion 6c and the upstream high temperature side circulation passage portion 6d.

  A pair of joints 19 a and 19 b are installed in the outer case 11, and a pair of joints 19 c and 19 d are also installed in the outer case 10 a of the external heat source device 10. Both ends of the low temperature side circulation passage 6b outside the unit are connected to joints 19a and 19c, and both ends of the high temperature side circulation passage 6e outside the unit are connected to joints 19b and 19d. Each of the joints 19a to 19d is provided with a drain plug.

Next, the hot water supply path 7 will be described.
As shown in FIG. 1, the hot water supply path 7 supplies hot water stored in the hot water storage tank 2 to a desired hot water supply destination such as a bath. The hot water supply passage 21 connected to the hot water tap and the hot water storage tank 2 are connected to each other. A tank hot water passage 22 connected to the hot water supply passage 21 from above, an auxiliary heating passage 23 branched from the tank hot water passage 22 and connected to the combustion type auxiliary heat source device 3, and connected to the hot water supply passage 21 from the auxiliary heat source device 3. The auxiliary heat source machine hot water outlet passage 24 and the like are provided.

  The hot water supply passage 21 has an upstream hot water supply passage portion 21a through which high-temperature water flows and a downstream hot water supply passage portion 21b through which mixed hot water flows, and the upstream end of the upstream hot water supply passage portion 21a is connected to the downstream end of the tank outlet hot water passage 22, The downstream end of the passage portion 21b is connected to the hot water tap. A mixing valve 25 is installed between the upstream hot water supply passage portion 21a and the downstream hot water supply passage portion 21b. A bypass passage portion 12 branched from the water supply path 5 is connected to the mixing valve 25. The mixing valve 25 controls the mixing ratio of water and high temperature water so that the tapping temperature becomes the command temperature. A flow rate sensor 21c is installed in the downstream hot water supply passage 21b.

  The tank outlet 22 has an upper outlet hot water passage 22a and a lower outlet hot water passage 22b. The upstream end of the upper outlet hot water passage 22a is connected to the upper part of the hot water storage tank 2 and is downstream of the lower outlet hot water passage 22b. The end is connected to the upstream end of the upstream hot water supply passage 21a. An auxiliary heating passage 23 is branched from between the upper effluent passage portion 22a and the lower effluent passage portion 22b. A passage hot water for detecting the temperature of hot water flowing from the tank hot water passage 22 to the auxiliary heating passage 23 is upstream of the branching portion of the auxiliary hot water passage 23 of the tank hot water passage 22 and upstream of the upper hot water passage passage portion 22a. A temperature detection sensor 25 (corresponding to temperature detection means) is installed.

  The auxiliary heating passage 23 has an upstream heating passage portion 23a and a downstream heating passage portion 23b, the upstream end of the upstream heating passage portion 23a is connected to the tank outlet passage 22, and the downstream end of the downstream heating passage portion 23b is an auxiliary heat source machine. 3 is connected to the inlet. A three-way valve 26 capable of switching between the tank hot water passage 22 and the auxiliary heating passage 23 is installed between the upstream heating passage portion 23a and the downstream heating passage portion 23b. The three-way valve 26 is also connected to the downstream end of the hot water return side passage portion 9b of the heat utilization circuit 9. This three-way valve 26 can switch connection / disconnection between the upstream heating passage portion 23a and the downstream heating passage portion 23b and connection / disconnection between the downstream heating passage portion 23b and the hot water return side passage portion 9b. is there. A pressure feed pump 27 (corresponding to pressure feed means) is installed in the downstream heating passage 23b.

  The auxiliary heat source machine outlet passage 24 has an upstream auxiliary outlet passage portion 24a and a downstream auxiliary outlet passage portion 24b, and the upstream end of the upstream auxiliary outlet passage portion 24a is connected to the outlet of the auxiliary heat source unit 3, and the downstream auxiliary outlet passage The downstream end of the portion 24b is connected to the upstream end of the upstream hot water supply passage portion 21a. A hot water / outward side passage portion 9a of the heat utilization circulation circuit 9 is branched from between the upstream auxiliary hot water passage portion 24a and the downstream auxiliary hot water passage portion 24b. A tank water proportional valve 28 is provided in the downstream auxiliary hot water passage portion 24b.

Next, the hot water heating circuit 8 will be described.
As shown in FIG. 1, the hot water heating circuit 8 is a circuit that circulates heating water supplied to a floor heating panel, a bathroom dryer or the like, and has a heating return side passage portion 8a and a heating forward side passage portion 8b. ing. The heat exchange passage portion 4b of the heating heat exchanger 4 is installed between the heating return side passage portion 8a and the heating outgoing side passage portion 8b.

Next, the heat utilization circulation circuit 9 will be described.
As shown in FIG. 1, the heat utilization circuit 9 is a closed circuit that circulates hot water and exchanges heat with the hot water heating circuit 8, and includes a hot water going-side passage portion 9 a, a hot water return side passage portion 9 b, A downstream heating passage portion 23 b of the auxiliary heating passage 23 and an upstream auxiliary hot water passage portion 24 a of the auxiliary heat source machine hot water passage 24 are provided. A heat exchange passage portion 4a of the heat exchanger 4 for heating is connected between the hot water going side passage portion 9a and the hot water return side passage portion 9b.

Next, the control unit 35 will be described.
As shown in FIG. 1, the hot water storage and hot water supply device 1 is controlled by a control unit 35. Detection signals of various sensors are transmitted to the control unit 35, and the control unit 35 controls the operation of the hot water storage and hot water supply device 1, the operation / stop of various pumps, the switching of the open / close states of various valves, and the opening degree adjustment. Then, various operations (hot water supply operation, hot water heating operation, heating operation, drainage operation, etc.) are executed.

  Next, hot water supply operation control using the auxiliary heat source unit 3 will be described based on the flowchart of FIG. In the figure, the symbol Si (i = 1, 2,...) Indicates each step. The control program for the hot water supply operation control is stored in the control unit 35 in advance.

  In the flowchart of FIG. 2, when this control is started, first, in S1, it is determined whether or not a hot water supply operation start condition is satisfied based on a user operation and detection signals of various sensors. When the determination of S1 is Yes, that is, when the condition for starting the hot water supply operation is satisfied, the process proceeds to S2, and S1 is repeated while the determination of S1 is No.

  Next, in S2, a hot water supply operation is started, and the process proceeds to S3. That is, with the opening of the hot water tap, hot water is pushed out from the upper part of the hot water storage tank 2 to the tank hot water passage 22 by the hot water pressure applied to the hot water storage tank 2, and this hot water passes through the tank hot water supply passage 22 to the hot water supply passage 21. The temperature is adjusted by mixing with low temperature clean water in the mixing valve 25, and the temperature-adjusted hot water is supplied from the hot water tap.

  Next, in S3, the detection signal of the hot water storage tank hot water temperature detection sensor 2d is read, and based on this detection signal, the hot water temperature (detection temperature) Ta stored in the upper part of the hot water storage tank 2 is calculated. Migrate to

  Next, in S4, it is determined whether or not the hot water temperature Ta in the upper part of the hot water storage tank 2 is equal to or lower than a first set temperature obtained by adding a predetermined set temperature α (for example, 5 ° C.) to a set temperature for hot water supply (for example, 40 ° C.). . When the determination of S4 is Yes, that is, when the amount of hot water in the hot water storage tank 2 is reduced and the hot water remains in the hot water storage tank 2 only for the volume above the hot water storage tank hot water temperature detection sensor 2d, The process proceeds to S5.

  If the determination in S4 is No, that is, if sufficient hot water remains in the hot water storage tank 2, the process proceeds to S6 to determine whether or not the hot water supply operation end condition is satisfied. When determination of S6 is Yes, it transfers to S12 and a hot water supply driving | operation is complete | finished. When the determination of S6 is No, that is, when the hot water supply operation is continued, the process proceeds to S3, and S3 and S4 are repeatedly executed.

  Next, in S5, when the hot water temperature Ta becomes equal to or lower than the first set temperature, the three-way valve 26 is switched to the auxiliary heating passage 23 side, the pumping pump 27 is driven, and the auxiliary heat source unit 3 is operated. The process proceeds to S7. That is, the hot water discharged from the hot water storage tank 2 in accordance with the driving of the pressure feed pump 27 flows from the upper outlet water passage portion 22a of the tank hot water passage 22 to the auxiliary heating passage 23 and flows into the auxiliary heat source device 3, and the auxiliary heat source device 3 The hot water heated at (for example, 75 degrees) flows through the auxiliary heat source machine hot water outlet passage 24 and flows into the hot water supply passage 21.

  At this time, since the hot water temperature Ta of the hot water flowing through the upper effluent hot water passage portion 22a exceeds the first set temperature, the hot water flows through the lower effluent hot water passage portion 22b and flows from the auxiliary heat source machine 3 to the hot water supply passage 21. Even when mixed with hot water flowing into the water, the hot water characteristics are not significantly deteriorated. For this reason, the pressure feed pump 27 can be controlled so that high temperature water does not flow from the auxiliary heat source machine hot water passage 24 into the tank hot water passage 22. For example, when the required hot water supply flow rate calculated based on the flow rate sensor 21c is 3.0 L / min, the pressure feed pump 27 is supplied from the auxiliary heat source unit 3 so that the push back flow rate to the tank hot water discharge passage 21 is 0.0 L / min. The hot water flow rate is controlled to be 3.0 L / min.

  Next, in S7, the detection signal of the passage hot water temperature detection sensor 25 is read, and based on this detection signal, the hot water temperature (detection temperature) Tb flowing through the upper outlet water passage portion 22a of the tank outlet passage 22 is calculated, The process proceeds to S8.

  Next, in S8, the hot water temperature Tb flowing through the upper outlet water passage portion 22a of the tank discharge passage 22 is set to a second set temperature (the set temperature of the present invention) obtained by adding a predetermined set temperature β (for example, 1 ° C.) to the hot water supply set temperature. Or less). When the determination of S8 is Yes, that is, when the hot water for the upper volume is discharged from the hot water storage tank hot water temperature detection sensor 2d in the hot water storage tank 2 and the hot water temperature Tb of the tank hot water discharge passage 22 is lowered, the process goes to S9. Transition.

  If the determination in S8 is No, that is, if hot water that can be supplied with hot water remains in the hot water storage tank 2, the process proceeds to S10, where it is determined whether the hot water supply operation end condition is satisfied, and the determination in S10 is made. In the case of Yes, it transfers to S12 and completes the hot water supply operation. When the determination of S8 is No, that is, when the hot water supply operation is continued, the process proceeds to S7, and S7 and S8 are repeatedly executed.

  Next, in S9, when the hot water temperature Tb becomes lower than the second set temperature, the output capacity of the pressure feed pump 27 is increased, and the process proceeds to S11. That is, hot water capable of supplying hot water at a temperature equal to or higher than the second set temperature flows from the upper part of the hot water storage tank 2 through the upper effluent hot water passage portion 22a, but the amount of the high temperature water gradually decreases, so the hot water temperature Tb gradually increases. When the temperature falls below the second set temperature, the output capacity of the pressure pump 27 is increased. For example, when the required hot water supply flow rate is 3.0 L / min, the pressure feed pump 27 has a hot water supply flow rate of 3.5 L / min from the auxiliary heat source unit 3 so that the push-back flow rate to the tank discharge passage 22 is 0.5 L / min. It is controlled to become. In this way, the flow rate of pushing back into the tank hot water passage 22 is made variable in accordance with the temperature of the hot water flowing from the upper part of the hot water storage tank 2 to the tank hot water passage 22. Note that the set value of the flow rate of pushing back into the tank discharge passage 22 is merely an example and can be changed as appropriate.

  In S11, it is determined whether or not the hot water supply operation termination condition is satisfied. If the determination in S11 is No, the determination in S11 is repeated. If the determination in S11 is Yes, the process proceeds to S12 to end the hot water supply operation. The control unit 35, the control programs S3 to S9, and the like correspond to the pressure feeding means control means of the present invention.

  When the pumping pump 27 is controlled so that the flow rate of pushing back into the tank hot water passage 22 becomes constant as in the prior art, the lower the required hot water supply flow rate (for example, 2.5 L / min), the push back flow rate into the tank hot water passage 22. However, the heat exchange efficiency of the auxiliary heat source unit 3 is remarkably lowered. However, by making the pressure pump 27 variable, it is possible to prevent the heat exchange efficiency of the auxiliary heat source unit 3 from being lowered.

The operation and effect of the hot water storage hot water supply apparatus 1 of the present invention will be described.
The hot water storage and hot water supply device 1 includes a passage hot water temperature detection sensor 25 for detecting the temperature of hot water discharged from the upper part of the hot water storage tank 2 to the tank hot water discharge passage 22, and a pressure pump according to the detected temperature of the passage hot water temperature detection sensor 25. The control unit 35 controls the hot water storage tank 2 from the upper part of the hot water storage tank 2 to the tank hot water passage 22 to the tank hot water passage 22 from the auxiliary heat source outlet hot water passage 24 according to the hot water temperature. The flow rate of hot water flowing in can be made variable.

  Therefore, when hot water that can be supplied with hot water remains downstream of the passage hot water temperature detection sensor 25 when the auxiliary heat source device 3 is operated, the hot water that can be supplied with hot water is generated by the auxiliary heat source device 3. Since the hot water discharge characteristic does not deteriorate significantly even if mixed with the hot water, the output capacity of the pressure pump 27 is suppressed, and the high temperature water from the auxiliary heat source unit 3 is not allowed to flow into the hot water storage tank 2 side. Therefore, since hot water does not return to the hot water storage tank 2 side, the temperature of the hot water flowing to the auxiliary heat source unit 3 does not rise, and it is possible to prevent the heat exchange efficiency of the auxiliary heat source unit 3 from being lowered. Since the power consumption of the pressure pump 27 can be reduced while maintaining, the operating efficiency of the hot water storage hot water supply apparatus 1 is improved.

  Further, the control unit 35 controls the pressure pump 27 so that the high temperature water does not flow from the auxiliary heat source machine hot water passage 24 into the tank hot water passage 22 when the detected temperature of the hot water temperature detection sensor 25 is equal to or higher than the set temperature. When the detected temperature of the hot water temperature detection sensor 25 is lower than the set temperature, the pressure pump 27 is controlled so that a part of the high-temperature water flows from the auxiliary heat source machine hot water outlet passage 24 to the tank hot water outlet passage 22. After the high temperature water that can be supplied with hot water downstream from the sensor 25 is surely consumed, the output capacity of the pressure feed pump 27 is increased so that a part of the high temperature water flows from the auxiliary heat source machine hot water outlet passage 24 into the tank hot water outlet passage 21. By doing so, the tapping characteristics can be maintained as usual.

Next, a mode in which the above embodiment is partially changed will be described.
[1] In the above embodiment, the passage hot water temperature detection sensor 25 is installed in the upper effluent hot water passage portion 22a. However, the present invention is not limited to this structure, and the passage hot water temperature detection sensor in the outer peripheral portion of the hot water storage tank 2 is used. You may install in the upper side of 25.

[2] In the above-described embodiment, the three-way valve 26 is installed in the downstream heating passage portion 23b of the auxiliary heating passage 23, but is not particularly limited to this structure. You may install the three-way valve 26 in the branched part which branched.

[3] In the above-described embodiment, the first and second set temperatures are merely examples, and can be appropriately changed as long as the first and second set temperatures are temperatures at which hot water can be supplied.

[4] In addition, those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. It is.

DESCRIPTION OF SYMBOLS 1 Hot water storage hot water supply equipment 2 Hot water storage tank 2d Hot water storage tank hot water temperature detection sensor 3 Auxiliary heat source machine 10 External heat source machine 21 Hot water supply passage 22 Tank hot water supply passage 23 Auxiliary heating passage 24 Auxiliary heat source machine hot water supply passage 25 Passage hot water temperature detection sensor 26 Three-way valve 27 Pump 35 control unit

Claims (2)

A tank hot water passage connected from the upper part of the hot water storage tank to the hot water supply passage, an auxiliary heating passage branched from the tank hot water passage and connected to the combustion type auxiliary heat source machine, a pressure feeding means installed in the auxiliary heating passage, An auxiliary heat source machine outlet hot water passage connected from the auxiliary heat source machine to the hot water supply passage, and when supplying high temperature water heated by the auxiliary heat source machine to the hot water supply passage, the tank from the auxiliary heat source machine hot water outlet passage In the hot water storage hot water supply apparatus that drives the pressure feeding means so that a part of the high temperature water flows into the hot water passage,
Temperature detecting means for detecting the temperature of hot water discharged from the upper part of the hot water storage tank to the tank hot water outlet passage, and pressure feeding means control means for controlling the pressure feeding means according to the detected temperature of the temperature detecting means. A hot water storage hot water supply device characterized by that. The pressure-feeding means control means controls the pressure-feeding means so that hot water does not flow from the auxiliary heat source machine hot water discharge passage into the tank hot water discharge passage when the temperature detected by the temperature detection means is equal to or higher than a preset temperature, and the temperature detection The said pressure feeding means is controlled so that a part of high-temperature water flows into the said tank outlet passage from the said auxiliary heat source machine outlet passage when the detection temperature of a means becomes less than preset temperature. Hot water storage hot water supply equipment.