JP2012093060A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable hot water supply system capable of properly detecting a hot water storing amount of a hot water storing means.SOLUTION: The hot supply water system has a first flow rate detecting means for detecting the flow rate of water passing through a water supplying flowing channel and the second flow rate detecting means for detecting the flow rate or water discharged from the hot water storing means during boiling up operation and detects the hot water storing amount in a hot water storing tank by integrating the detected flow rate by the second flow rate detecting means during the boiling up operation as a hot water increasing amount, and by integrating the detected flow rate by the first flow rate detecting means during supplying hot water as a hot water reducing amount.

Description

  An embodiment of the present invention relates to a hot water supply system that includes a heat pump refrigeration cycle having a water heat exchanger as a heat source, and stores hot water in hot water storage means by circulating water in the hot water storage tank to the water heat exchanger.

  There is a hot water supply system that uses a heat pump type refrigeration cycle as a heat source and stores hot water (hot water) for hot water supply in a hot water storage tank as hot water storage means (for example, Patent Document 1). In this hot water supply system, in order to grasp the amount of hot water stored in the hot water storage tank, that is, the amount of hot water stored, the amount of increase in hot water to the hot water storage tank is estimated by temperature detection, and the amount of hot water from the hot water storage tank is reduced. The amount of hot water outflow is detected, and the amount of increase in hot water and the amount of decrease in hot water are added together.

JP 2008-122018 A

  The hot water flowing out from the hot water supply port is a mixture of hot water from the hot water storage tank and water supplied from the water supply source. For this reason, the amount of hot water stored in the hot water storage tank cannot be accurately detected only by detecting the amount of hot water flowing out from the hot water supply port.

  An object of the embodiment of the present invention is to provide a reliable hot water supply system capable of accurately detecting the amount of hot water stored in the hot water storage means.

  A hot water supply system according to an embodiment of the present invention includes a heat pump type refrigeration cycle for returning refrigerant discharged from a compressor to a compressor through a water heat exchanger, a decompression means, and an air heat exchanger, hot water storage means, and a water supply source. A water supply passage for supplying water to the hot water storage means, a hot water supply passage for discharging hot water from the hot water storage means, and water is led out from the hot water storage means and heated by the water heat exchanger to heat the upper portion of the hot water storage means A hot water storage circuit that forms a circulation path for a boiling operation that leads to water, a first flow rate detection means that detects a flow rate of water passing through the water supply flow path, and a flow rate of water that is derived from the hot water storage means during the boiling operation The flow rate detected by the second flow rate detecting means for detecting the flow rate and the detected flow rate of the second flow rate detecting means during the boiling operation are integrated as the amount of increase in hot water, and the detection of the first flow rate detecting means during hot water supply from the hot water flow path Accumulate the flow rate as the amount of hot water decrease. By, and a hot water storage amount detecting means for detecting the amount of hot water storage in the hot water storage tank.

The figure which shows the structure of 1st Embodiment, and the flow of warm water and the water at the time of boiling operation. The figure which shows the flow of the warm water at the time of the defrost operation in 1st Embodiment. The figure which shows the flow of the warm water and the water at the time of hot water supply and water supply in 1st Embodiment. The figure which shows the remote controller in each embodiment. The flowchart for demonstrating operation | movement of each embodiment. The figure which shows the structure of 2nd and 3rd embodiment and the flow of warm water and water at the time of boiling operation. The figure which shows the structure of 4th Embodiment, and the flow of warm water and the water at the time of boiling operation. The figure which shows the flow of the warm water at the time of the defrost operation in 4th Embodiment.

[1] Hereinafter, a first embodiment will be described with reference to the drawings.
As shown in FIG. 1, a tank unit 21 is connected by piping to a heat pump unit 1 having a heat pump refrigeration cycle as a heat source, thereby forming a hot water supply system.

First, the heat pump unit 1 will be described.
The refrigerant discharge port of the compressor 2 is connected to the inlet side of the refrigerant flow path 4a of the water heat exchanger 4 through the four-way valve 3, and the expansion valve 5 serving as a decompression means, air heat is connected to the outlet side of the refrigerant flow path 4a. The suction port of the compressor 2 is connected by piping through the exchanger 6 and the four-way valve 3. An outdoor fan 7 is disposed in the vicinity of the air heat exchanger 6. The suction port of the circulation pump 13 is connected to the water-side connection port 11 through one flow path of the three-way valve 12, and the water flow path 4 b and the three-way valve of the water heat exchanger 4 are connected to the discharge port of the circulation pump 13. The hot water side connection port 15 is connected by piping through one of the flow paths 14. The hot water side connection port 15 is connected to the suction port of the circulation pump 13 through the other flow path of the three-way valve 12, and the other side of the three-way valve 14 is connected to the outlet side of the water flow path 4 b of the water heat exchanger 4. The water-side connection port 11 is pipe-connected through the flow path.

  During a boiling operation in which hot water is stored in a hot water storage tank 22 that is a hot water storage means, the refrigerant discharged from the compressor 2 is the four-way valve 3, the refrigerant flow path 4a of the water heat exchanger 4, the expansion valve 5, air, as shown by the arrows in the figure. A refrigerant flow path that returns to the compressor 2 through the heat exchanger 6 and the four-way valve 3 is formed, and the water heat exchanger 4 functions as a condenser and the air heat exchanger 6 functions as an evaporator. At this time, one flow path of each of the three-way valves 12 and 14 is opened, and warm water or water entering the water side connection port 11 flows through the three-way valve 12 and the circulation pump 13 to the water flow path 4b of the water heat exchanger 4; The heated hot water flows out from the hot water side connection port 15 through the three-way valve 14.

  During the defrosting operation for removing frost adhering to the air heat exchanger 6, the refrigerant discharged from the compressor 2 is the four-way valve 3, the air heat exchanger 6, the expansion valve 5, and the water heat as shown by arrows in FIG. A refrigerant flow path 4a of the exchanger 4 and a refrigerant flow path that returns to the compressor 2 through the four-way valve 3 are formed, and the air heat exchanger 6 functions as a condenser and the water heat exchanger 4 functions as an evaporator. At this time, the other flow path of each of the three-way valves 12 and 14 is opened, and hot water entering the hot water side connection port 15 flows into the water flow path 4b of the water heat exchanger 4 through the three-way valve 12 and the circulation pump 13, where heat is generated. The water deprived of water flows out from the water-side connection port 11 through the three-way valve 14.

Next, the tank unit 21 will be described.
The tank unit 21 includes a hot water storage tank 22 that is a hot water storage means, and a bottom portion of the hot water storage tank 22 is connected to a water supply connection port 23 that is connected to a water supply source such as a water supply via a water supply pipe 24 that is a water supply flow path. The water supply pipe 24 is provided with two pressure reducing valves 25 and 25 and a flow rate sensor 26 which is a first flow rate detection means. The flow rate sensor 26 detects the flow rate f1 of water passing through the water supply pipe 24.

  The hot water storage tank 22 is provided with a plurality of temperature sensors (first temperature detection means) T3, T2, and T1 that detect the temperature of the hot water at a plurality of locations along the depth direction of the hot water storage tank 22. The temperature distribution of the hot water in the depth direction of the hot water storage tank 1 can be captured from the detected temperatures of these temperature sensors.

  A water pipe 27 is connected between the downstream side from the position where the flow rate sensor 26 is disposed in the water supply pipe 24 and the forward connection port 28, and a check valve 31, a flow rate sensor (second flow rate detection means) 32, A temperature sensor (second temperature detection means) 33 is also provided. The check valve 31 allows the flow of water that is led out from the bottom of the hot water storage tank 22 toward the forward connection port 28, and blocks the flow of water in the opposite direction. The flow rate sensor 32 detects the flow rate f2 of water going to the forward connection port 28 via the check valve 31. The temperature sensor 33 detects the temperature Tx of the water passing through the check valve 31 and going to the outgoing connection port 28.

  A bypass pipe 27a is connected to bypass the check valve 31, the flow sensor 32, and the temperature sensor 33 of the water pipe 27, and a check valve 34 and a flow sensor (third flow detection means) 35 are arranged in the bypass pipe 27a. Established. The check valve 34 allows the flow of water from the forward connection port 28 toward the bottom of the hot water storage tank 22 and blocks the flow of water in the opposite direction. The flow rate sensor 35 detects the flow rate f3 of water that goes to the bottom of the hot water storage tank 22 via the check valve 34.

  The water connection port 11 of the heat pump unit 1 is connected to the forward connection port 28 via the water pipe 29, and the return connection port 42 of the tank unit 21 is connected to the hot water side connection port 15 of the heat pump unit 1 via the hot water pipe 41. Is connected. A hot water pipe 43 is connected from the return connection port 42 to the upper part of the hot water storage tank 22.

  Thus, the water heat exchanger 4 of the heat pump unit 1 connects the bottom of the hot water storage tank 22 and the upper portion of the hot water storage tank 22 by a part of the water supply pipe 24, the water pipe 27, the bypass pipe 27a, the water pipe 29, and the hot water pipes 41 and 43. A hot water storage circuit communicating with each other is formed. In this hot water storage circuit, a circuit for heating operation that passes through the check valve 31, the flow sensor 32, and the temperature sensor 33 of the water pipe 27, and a circuit for defrosting operation that passes through the check valve 34 and the flow sensor 35 of the bypass pipe 27a. A circulation path is selectively formed.

  A hot water discharge pipe 44, which is a hot water flow path, is connected from the upper part of the hot water storage tank 22 to the hot water connection port 46, and a mixing valve 45 is disposed in the hot water discharge pipe 44. The mixing valve 45 generates hot water having a hot water supply set temperature by mixing water guided from the bypass pipe 24 a branched from the water supply pipe 24 with hot water flowing through the hot water discharge pipe 44. The generated hot water is led to a kitchen, a washroom, a bathroom, and the like, which are used places, through a hot water connection port 46.

  The hot water and the flow of water at the time of hot water supply / water supply for supplying hot water to the hot water storage tank 22 while supplying the hot water of the hot water storage tank 22 to the place of use are indicated by arrows in FIG.

  On the other hand, a controller 50 is connected to the heat pump unit 1 and the tank unit 21, and a remote control type operating device (abbreviated as a remote controller) 60 is connected to the controller 50.

  As shown in FIG. 4, the remote controller 60 includes a cover 65 that covers an operation unit including a liquid crystal display unit 61, a full operation button 62, temperature control buttons 63 and 64, an operation mode selection button, and the like so as to be freely opened and closed. The liquid crystal display unit 61 includes a hot water storage amount display region 61a for displaying the hot water storage amount as a percentage, a temperature display region 61b for displaying the hot water supply set temperature numerically, and the like.

The control unit 50 includes the following means (1) to (3) as main functions.
(1) During boiling operation, the detected flow rate f2 of the flow sensor 32 is integrated as the amount of increase in hot water, and the integrated value when the integrated value reaches a predetermined set value and hot water is full is detected as the hot water storage amount 100. After that, the detection flow rate of the flow rate sensor 26 during hot water supply from the hot water discharge pipe 44 (= the flow rate of water supply to the hot water storage tank 22) f1 is integrated as a hot water decrease amount, and the flow rate sensor 35 during the defrosting operation is integrated. Hot water storage amount detection means for detecting the hot water storage amount (ratio to 100%) of the hot water storage tank 22 by integrating the detected flow rate f3 as the hot water decrease amount.

  (2) Display control means for displaying the hot water storage amount detected by the hot water storage amount detection means as a percentage in the hot water storage amount display area 61a of the liquid crystal display unit 61 in the remote controller 60 as shown in FIG.

  (3) When the abnormality determination mode is set by the remote controller 60, a hot water storage circuit between the heat pump unit 1 and the tank unit 21 is formed with a circuit for boiling operation, and in this circuit for heating operation If the flow sensor 32 detects the flow, it is determined that the connection between the water pipe 29 and the hot water pipe 41 in the hot water storage circuit is normal, and the flow sensor 32 does not detect the flow in the circulation path for the same heating operation, and the flow sensor 35 When the flow is detected, a circulation path for defrosting operation is formed in the hot water storage circuit, and if the flow sensor 32 detects the flow in the circulation path for defrosting operation, the water pipe 29 and the hot water pipe 41 in the hot water storage circuit are reversely connected. In the case where it is determined that there is an abnormality and the flow sensors 32 and 35 do not detect the flow in the circulation path for the boiling operation, and in the circulation path for the defrosting operation Abnormality determining means for determining as abnormal clogging hot water storage circuit when the amount sensor 32 does not detect the flow.

Next, the operation will be described with reference to the flowchart of FIG.
When the boiling operation mode is set by the remote controller 60 (YES in step 101), the boiling flow path shown in FIG. 1 is formed, and the water at the bottom of the hot water storage tank 22 is heated by the water heat exchanger 4, and the water Hot water that has passed through the heat exchanger 4 is guided to the upper part of the hot water storage tank 22.

  During this boiling operation, the detected flow rate f2 of the flow sensor 32 in the water pipe 27 is integrated as the amount of increase in hot water (step 102), and the integration when the integrated value reaches a predetermined set value and full hot water is detected. The value is initially set as a hot water storage amount of 100%. Thereafter, when the defrosting flow path shown in FIG. 2 is formed and the defrosting operation for the air heat exchanger 6 is executed (YES in Step 103), the detected flow rate f3 of the flow rate sensor 35 in the bypass pipe 27a is the amount of decrease in hot water. (Step 104). When the hot water supply / water supply flow path shown in FIG. 3 is formed and the hot water supply operation to the place of use is executed (YES in step 105), the detected flow rate f1 of the flow sensor 26 in the water supply pipe 24 is integrated as the hot water decrease amount. (Step 106). The water supply flow rate f1 detected by the flow sensor 26 is the same as the amount of hot water supplied to the place of use (the amount of hot water discharged from the hot water storage tank 22).

  These integrated values are sequentially added to detect the amount of hot water stored in the hot water storage tank 22 (ratio to 100%) (step 107). The detected hot water storage amount is displayed as a percentage in the hot water storage amount display area 61a of the liquid crystal display 61 in the remote controller 60 (step 108). By looking at the display on the remote controller 60, it is possible to grasp at a glance how much hot water that can be supplied with hot water remains. As described above, the hot water supply system according to the first embodiment can accurately detect the amount of hot water stored in the hot water storage tank 22 as hot water storage means, and can reduce the number of temperature detection means.

  By the way, when the worker sets the abnormality determination mode with the remote controller 60 when the installation of the hot water supply system is completed (YES in step 110), the circulation pump 13 is operated for t1 and the circulation path for the boiling operation in FIG. It is formed (step 111). At this time, it is determined whether or not a flow (flow rate f2) is detected by the flow rate sensor 32 in the water pipe 27 (step 112). If the flow is detected (YES in step 112), it is determined that the connection between the water pipe 29 and the hot water pipe 41 is normal (step 113). Thereafter, various operations are allowed.

  However, when the flow (flow rate f2) is not detected by the flow sensor 32 (NO in step 112), it is determined whether or not the flow (flow rate f3) is detected by the flow sensor 35 in the bypass pipe 27a (step 114). If a flow is detected (YES in step 114), the flow is switched to the defrosting operation circulation path of FIG. 2 and the circulation pump 13 is operated for t1 (step 115). At this time, it is determined whether or not a flow (flow rate f2) is detected by the flow rate sensor 32 in the water pipe 27 (step 116). If the flow is detected (YES in step 116), it is determined that the water pipe 29 and the hot water pipe 41 are in the reverse connection abnormality (step 117). As a result of this determination, the subsequent operation is prohibited and the fact that the reverse connection is abnormal is displayed on the liquid crystal display unit 61 of the remote controller 60.

  Further, in the above-described circulation path for boiling operation, when both the flow sensors 32 and 35 do not detect the flow (NO in step 112, NO in step 114), the hot water storage circuit including the water pipe 29 and the hot water pipe 41 is abnormally clogged. Is determined (step 118). As a result of this determination, the subsequent operation is prohibited and the fact that the reverse connection is abnormal is displayed on the liquid crystal display unit 61 of the remote controller 60.

  Even when the flow sensor 32 does not detect a flow in the circulation path for the defrosting operation (NO in step 116), it is determined that the hot water storage circuit including the water pipe 29 and the hot water pipe 41 is clogged abnormally (step 118). . As a result of this determination, the subsequent operation is prohibited and the fact that the reverse connection is abnormal is displayed on the liquid crystal display unit 61 of the remote controller 60.

  By having such an abnormality determination function, it is possible to prevent a problem that the operation is performed with an abnormality occurring, and it is possible to improve reliability.

[2] A second embodiment will be described.
As shown in FIG. 6, auxiliary tank units 71 and 81 are disposed in addition to the tank unit 21. The upper and bottom portions of the hot water storage tanks 22, 72, 81 of the tank unit 21 and the auxiliary tank units 71, 81 constitute hot water storage means that are sequentially connected in series by a water pipe 47. Of these hot water storage tanks 22, 72, 81 connected in series, the hot water storage pipe 22 is connected to the bottom of a hot water storage tank 82 (water supply side hot water storage tank) located on one end side, and the hot water storage tank 22 located on the other end side. An outlet hot water pipe 44 and a hot water pipe 43 are connected to the upper part of the hot water storage tank.

  That is, a hot water storage circuit is formed that communicates the bottom of the hot water storage tank 82 that is the water supply side hot water storage tank and the upper part of the hot water storage tank 22 that is the hot water storage tank through the water heat exchanger 4 of the heat pump unit 1. In this hot water storage circuit, water is led out from the bottom of a hot water storage tank 82 which is a water supply side hot water storage tank, and the water is passed through a check valve 31, a flow rate sensor 32, a temperature sensor 33, and a water heat exchanger 4 in a water pipe 27. Hot water is led out from the circulation path for the boiling operation leading to the upper part of the hot water storage tank 22 which is a hot water storage tank and the upper part of the hot water storage tank 22 which is a hot water storage tank, and the hot water is reversely connected to the water heat exchanger 4 and the bypass pipe 27a. A circulation path for defrosting operation is selectively formed through the stop valve 34 and the flow rate sensor 35 and returning to the bottom of the hot water storage tank 82 which is a water supply side hot water storage tank.

  The flow rate sensor 32 detects the flow rate of water derived from the bottom of the hot water storage tank 82 that is a water supply side hot water storage tank during the boiling operation. The flow rate sensor 35 detects the flow rate of water returning to the bottom of the hot water storage tank 82 which is a water supply side hot water storage tank during the defrosting operation.

The temperature sensors T 3, T 2, T 1 are attached only to the hot water storage tank 22. Since the hot water storage tanks 22, 72, and 83 are in communication, whatever the capacity of the hot water storage tanks 72, 82, the hot water storage tanks 22, 72, 82 are filled with only the temperature sensors T3, T2, T1. Can be detected.
Other configurations and operations are the same as those in the first embodiment, except that the detection of hot water fullness is different. Therefore, the description is omitted.

[3] A third embodiment will be described.
This third embodiment is intended for a configuration having a plurality of hot water storage tanks 22, 72, 82 as hot water storage means, as in FIG. 6 of the second embodiment. The control unit 50 has the following means (11) instead of the function (1) of the first embodiment as a main function.

  (11) During boiling operation, the detected flow rate f2 of the flow sensor 32 is integrated as an increase amount of hot water, and the integrated value when the detected temperature of the temperature sensor 33 in the water pipe 24 reaches the set value Tz is initially set as the hot water storage amount 100%. After that, the detected flow rate f3 of the flow rate sensor 26 at the time of hot water supply from the hot water discharge pipe 44 (= the supplied water flow rate to the hot water storage tank 22) f1 is integrated as a decrease amount of hot water, and the detected flow rate f3 of the flow rate sensor 35 at the time of defrosting operation Is added as a hot water decrease amount to detect the hot water storage amount (ratio to 100%) of the hot water storage tanks 22, 72, 82, and while any of the temperature sensors T3, T2, T1 detects the hot water temperature, Hot water storage amount detection means for detecting a hot water storage amount (ratio to 100%) based on a position in the depth direction of the temperature sensor that detects the temperature and updating it as a final detection result.

  That is, when the hot water in the hot water storage tanks 22, 72, 82 is full, the hot water flows into the water pipe 27 and the temperature detected by the temperature sensor 33 rises to the set value Tz, so that it is caught as full. Further, since the mounting positions of the temperature sensors T3, T2, and T1 are known in advance, it is possible to detect from the mounting position how much the actual hot water storage amount is relative to the hot water storage amount 100%. When detecting the amount of hot water storage based on the flow rate detection, there is a possibility that an error based on the length or capacity of the water pipe 47 between the hot water storage tanks 22, 72, 82 may occur, but any one of the temperature sensors T3, T2, T1. While detecting the hot water temperature, the hot water storage tank 22, by detecting the hot water storage amount based on the position in the depth direction of the temperature sensor detecting the temperature and updating it as the final detection result. An appropriate amount of stored hot water can be detected without being affected by the length or capacity of the water pipe 47 between 72 and 82.

  Other configurations and operations are the same as those of the first embodiment. Therefore, the description is omitted.

[4] A fourth embodiment will be described.
The fourth embodiment is different from the first embodiment in that the refrigeration cycle of the heat pump unit 1 employs CO ₂ as a refrigerant.

  That is, as shown in FIG. 7, the refrigerant discharge port of the compressor 2 is connected to the inlet side of the refrigerant flow path 4a of the water heat exchanger 4, and the expansion valve 5 and air heat exchange are connected to the outlet side of the refrigerant flow path 4a. The suction port of the compressor 2 is connected via a pipe 6.

  During the boiling operation, there is a flow path in which the refrigerant discharged from the compressor 2 returns to the compressor 2 through the refrigerant flow path 4 a of the water heat exchanger 4, the expansion valve 5, and the air heat exchanger 6 as indicated by the arrows in the figure. At the same time, the circulation pump 13 and the outdoor fan 7 operate. At the time of defrosting operation, as shown in FIG. 8, only the circulation pump 13 and the outdoor fan 7 are stopped, and the same flow path as that at the time of boiling operation is formed.

In this case, the check valve 34 and the flow sensor 35 in the tank unit 21 are removed. Then, the detected flow rate f2 of the flow sensor 32 is integrated as the amount of increase in hot water, and the detected flow rate of the flow sensor 26 during hot water supply from the hot water discharge pipe 44 (= the supply water flow rate to the hot water storage tank 22) f1 is integrated as the amount of decrease in hot water. Thus, the amount of hot water stored in the hot water storage tank 22 as hot water storage means is detected.
Other configurations and operations are the same as those of the first embodiment. Therefore, the description is omitted.

  As described above, the hot water supply system of each embodiment can accurately detect the amount of hot water stored in the hot water storage means, and can reduce the number of temperature detection means.

  [5] The above embodiments are presented as examples, and are not intended to limit the scope of the invention. Each of the novel embodiments can be implemented in various other forms, and various omissions, rewrites, and changes can be made without departing from the scope of the invention. In these embodiments and modifications, the scope of the invention is included in the gist, and is included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Heat pump unit, 2 ... Compressor, 3 ... Four-way valve, 4 ... Water heat exchanger, 5 ... Expansion valve, 6 ... Air heat exchanger, 7 ... Outdoor fan, 13 ... Circulation pump, 21 ... Tank unit, 22 ... hot water storage tank (hot water storage means), T3, T2, T1 ... temperature sensor (first temperature detection means), 24 ... water supply pipe (water supply flow path), 26 ... flow sensor (first flow rate detection means), 27 ... water pipe, 27a ... bypass pipe, 31 ... check valve, 32 ... flow sensor (second flow detection means), 33 ... temperature sensor (second temperature detection means), 34 ... check valve, 35 ... flow sensor (third flow detection) Means), 44 ... Hot water pipe (hot water flow path), 45 ... Mixing valve, 50 ... Control part, 60 ... Remote control, 61 ... Liquid crystal display part, 61a ... Hot water storage amount display area

Claims (5)

A heat pump type refrigeration cycle for passing the refrigerant discharged from the compressor through the water heat exchanger, the decompression means, and the air heat exchanger and returning it to the compressor;
Hot water storage means,
A water supply passage for supplying water from a water supply source to the hot water storage means;
A hot water flow path for hot water from the hot water storage means;
A hot water storage circuit that forms a circulation path for a boiling operation that leads out water from the hot water storage means and heats the water with the water heat exchanger to lead to the hot water storage means;
First flow rate detection means for detecting the flow rate of water passing through the water supply flow path;
Second flow rate detection means for detecting the flow rate of water derived from the hot water storage means during the boiling operation;
By integrating the detection flow rate of the second flow rate detection means during the boiling operation as an increase amount of hot water, and integrating the detection flow rate of the first flow rate detection means during hot water supply from the hot water flow path as the decrease amount of hot water , Hot water storage amount detection means for detecting the hot water storage amount of the hot water storage means,
A hot water supply system comprising: The hot water storage circuit includes a circulation path for a boiling operation in which water is led out from the hot water storage means and the water is heated by the hydrothermal exchanger and led to the hot water storage means, and hot water is led out from the hot water storage means and the hot water is Selectively forming a defrosting operation circulation path that returns to the hot water storage means through the water heat exchanger,
Further comprising third flow rate detecting means for detecting the flow rate of warm water returning to the hot water storage means during the defrosting operation;
The hot water storage amount detection means integrates the detected flow rate of the second flow rate detection means during the boiling operation as a warm water increase amount, and integrates the detection flow rate of the first flow rate detection means during the hot water supply as a hot water decrease amount. The amount of hot water stored in the hot water storage means is detected by integrating the detected flow rate of the third flow rate detection means during the defrosting operation as a hot water decrease amount.
The hot water supply system according to claim 1. The hot water storage means is a plurality of hot water storage tanks whose top and bottom are sequentially connected in series by a water pipe,

The hot water storage circuit is located at one end of the plurality of hot water storage tanks connected in series and is connected to the bottom and the other end of the water supply hot water storage tank connected to the water supply flow path at the bottom. Is connected to the upper part of the hot water storage tank connected to the hot water via the water heat exchanger, the water is led out from the bottom of the hot water storage tank, and the water is heated by the water heat exchanger. Form a circuit for boiling operation leading to the top of the tank,
The second flow rate detection means detects the flow rate of water derived from the bottom of the water supply side hot water storage tank during the boiling operation.
The hot water supply system according to claim 1. Among the plurality of hot water storage tanks, a plurality of first temperature detection means for detecting the temperature of the hot water in the hot water storage side hot water storage tank at a plurality of locations along the depth direction of the hot water storage tank;
A second temperature detection means provided in the circulation path for the boiling operation;
Further comprising
When the detected temperature of the second temperature detecting means during the boiling operation reaches a set value, the hot water storage amount detecting means calculates the accumulated value of the detected flow rate of the second flow rate detecting means at that time as the hot water storage amount of 100%. After that, the detected flow rate of the second flow rate detecting means during the boiling operation is integrated as the hot water increase amount, and the detected flow rate of the first flow rate detecting means during the hot water supply is integrated as the hot water decrease amount. Detecting the amount of hot water stored in the plurality of hot water storage tanks, and while any one of the first temperature detecting means detects the hot water temperature, the first temperature detecting means for detecting the temperature of the first temperature detecting means in the depth direction. Detecting the amount of hot water stored in the hot water storage tank based on the position and updating it as a final detection result;
The hot water supply system according to claim 3. If the hot water storage circuit forms the circulation path for the boiling operation, and the second flow rate detection means detects a flow in the circulation path for the boiling operation, it is determined that the connection of the hot water storage circuit is normal, When the second flow rate detection means does not detect the flow in the circulation path for the boiling operation and the third flow rate detection means detects the flow, the circulation path for the defrosting operation is formed in the hot water storage circuit, If the second flow rate detection means detects a flow in the circuit for defrosting operation, it is determined that the hot water storage circuit is in reverse connection abnormality, and the second flow rate detection means and Abnormality determining means for determining that the hot water storage circuit is clogged abnormally when the third flow rate detecting means does not detect the flow and when the second flow rate detecting means does not detect the flow in the circulation path for the defrosting operation. ,
The hot water supply system according to claim 2, further comprising:

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