JP2009204274A - Hot water storage type hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent water which becomes cold water within a hot water supply pipe from coming out from a hot water supply tap when it is opened, in a hot water storage type hot water supply system. <P>SOLUTION: The hot water storage type hot water supply system 1 is provided with a hot water supply tank 2, a heating source 3 for heating water in the hot water storage tank 2, and the hot water supply pipe 6 for interconnecting the hot water storage tank 2 and the hot water supply tap 60. The hot water supply pipe 6 is constituted by connecting a first hot water supply pipe 6a connected to the hot water storage tank 2 with a second hot water supply pipe 6b connected to the hot water supply tap 60 via a hot water supply mixing valve 6c. One ends of first circulating piping 7a and second circulating piping 7b are connected to the hot water storage tank 2, respectively and the other ends are connected to the second hot water supply pipe 6b, respectively. A circulating pump 7c is provided in a circulation passage 7 constituted by the first circulating piping 7a, the second hot water supply pipe 6b, the second circulating piping 7b and the hot water storage tank 2. By driving the circulating pump 7c, water becoming cold in the circulation passage 7 is heated by supply of water at relatively high temperature inside the hot water storage tank 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply system that discharges hot water using hot water obtained by heating water supply with a heating source.

  Conventionally, a hot water storage type hot water supply system including a heating source and a hot water storage tank for storing heated hot water is known (see, for example, Patent Document 1). When such a hot water storage hot water system is used in a house or the like, for example, a heating source and a hot water storage tank are arranged outdoors, and a hot water tap connected to the hot water storage tank via a hot water pipe is located in a room away from the hot water storage tank. Arranged. Here, when hot water has not been used for a long time, at the time of next hot water discharge, water whose water temperature has decreased due to heat radiation inside the hot water supply pipe is discharged before the hot water, and the user may feel uncomfortable. That is, for example, when performing dishwashing work, if the water in the hot water supply pipe is cold, even if the user loosens the hot water tap to use hot water, the temperature from the hot water tap is much higher than the temperature imagined by the user. Cold water comes out.

  By the way, a hot water storage type hot water supply system provided with a return pipe that connects a portion of the hot water supply pipe near the hot water faucet and a hot water storage tank is known (for example, see Patent Document 2). In such a hot water storage hot water supply system, when the water temperature inside the hot water supply pipe drops, the circulation pump is operated to circulate the hot water in the hot water storage tank through the hot water supply pipe, so that even if hot water is not used for a long time, Hot water can be discharged from the hot water tap.

However, if the hot water used for the hot water is circulated through the hot water supply pipe and the return pipe, the amount of hot water in the hot water storage tank that can be used for the hot water decreases. That is, when hot water is circulated through the hot water supply pipe and returned to the hot water storage tank, the amount of hot water at the medium temperature increases due to the temperature of the hot water decreasing until the hot water is circulated and returned to the hot water storage tank. The amount decreases. Therefore, more energy is consumed in the heating source in order to secure a sufficient amount of hot water again, and it takes time to secure a sufficient amount of hot water again. In particular, in a configuration in which the temperature of the hot water to be discharged is a medium temperature lower than the temperature of the hot water heated by the heating source, the hot water is mixed with hot water in the hot water storage tank, and the temperature of the hot water is adjusted and discharged. When circulating hot water, waste is increased. That is, in this case, it is necessary to circulate hot water without opening the hot water faucet, and the same amount of hot water mixed with hot water must be drained through a circulation path until the hot water returns to the hot water storage tank. . And since the temperature of the hot water which circulates and returns to the hot water storage tank is lowered by mixing the feed water, the amount of hot water in the hot water storage tank is reduced. Therefore, the configuration in which hot water is circulated between the hot water supply pipe and the return pipe in this way is not always optimal for use as a measure for preventing cold water from coming out of the hot water supply pipe when the hot water tap is opened. .
JP 2006-57871 A JP 2006-10180 A

  The present invention has been made in view of the above problems, and when the hot water tap is opened, the water that has become cold water in the hot water pipe does not come out of the hot water tap and can be used comfortably. An object is to provide a hot water storage system.

  In order to achieve the above object, the invention of claim 1 has a hot water storage tank for storing hot water and water supply so as to have a hot water layer in the upper part and a water supply layer in the lower part, and one end connected to the lower part of the hot water storage tank. A water supply outflow pipe, a heating source connected to the other end of the water supply outflow pipe for heating the water supplied from the water supply layer to heat it, and supplying hot water from the heating source to the hot water layer of the hot water storage tank A hot water supply pipe, and a hot water supply pipe connecting the hot water storage tank and a hot water tap, and containing hot water of the hot water layer or hot water of the hot water layer and having a temperature higher than that of the hot water. In a hot water storage hot water supply system capable of discharging hot water from the hot water faucet through a hot water supply pipe, one end is connected to the hot water storage tank, the other end is connected to the hot water supply pipe, and one end is connected to the hot water storage tank. The other end is connected to the first circulation pipe of the hot water supply pipe. Disposed in a circulation path constituted by a second circulation pipe connected to a part closer to the hot water faucet side than the formed part, the hot water storage tank, the first circulation pipe, the second circulation pipe and the hot water pipe. And a circulation pump for circulating the water in the circulation path from the first circulation pipe through the hot water supply pipe, the second circulation pipe, and the hot water storage tank in this order.

  According to a second aspect of the present invention, in the first aspect of the present invention, one end of the first circulation pipe and the second circulation pipe is connected below a portion of the hot water storage tank where the hot water layer is normally located. Thus, when the circulation pump is driven, the temperature of the water in the circulation path is lower than the temperature of the hot water in the hot water layer and higher than the temperature of the water supply.

  The invention of claim 3 is the invention of claim 1 or 2, wherein a heat exchanger for connecting the first circulation pipe and the second circulation pipe is provided inside the hot water storage tank. Thus, the water in the circulation path is configured not to be mixed with hot water or water supply stored in the hot water storage tank.

  According to the invention of claim 1, since the water in the circulation path is circulated through the hot water storage tank by the circulation pump, the temperature of the water in the hot water supply pipe is raised even if the temperature of the water in the hot water supply pipe is low. be able to. Therefore, when the hot water tap is opened, the water cooled in the hot water pipe can be prevented from coming out of the hot water tap, and the hot water storage type hot water system can be used more comfortably. Since the temperature of the water in the hot water supply pipe can be raised without using the hot water used for hot water from the hot water tap, the amount of hot water in the hot water storage tank is hardly reduced and the efficiency of the hot water storage type hot water system is maintained. It is possible to prevent cold water from coming out of the hot water tap.

  According to the invention of claim 2, when the temperature of the water in the hot water supply pipe is low, the temperature of the water in the hot water supply pipe is changed to the temperature of the medium temperature water in the hot water storage tank of the part to which the first circulation pipe is connected. It is possible to prevent the water cooled in the hot water pipe from coming out of the hot water tap when the hot water tap is opened. Therefore, the user does not unexpectedly touch cold water, and the hot water storage type hot water supply system can be used more comfortably. Further, the water circulating in the circulation path returns to a portion where the water temperature is relatively lower than the vicinity of the boundary between the hot water layer and the water supply layer in the hot water storage tank to which the second circulation pipe is connected. Therefore, even when the temperature of the water passing through the first circulation pipe, the hot water supply pipe, and the second circulation pipe is relatively low, the amount of hot water in the hot water storage tank does not decrease, and the efficiency of the hot water storage type hot water supply system is maintained. Can do.

  According to the invention of claim 3, since the water in the circulation path does not mix with the hot water or the feed water in the hot water storage tank, the influence of the circulation of the water in the circulation path on the stratified configuration in the hot water storage tank can be reduced. The amount of hot water in the hot water storage tank can be maintained more reliably. Since the heat exchanger is provided as a part of the circulation path inside the hot water storage tank, the water temperature in the circulation path can be efficiently warmed and cold water can be prevented from coming out of the hot water tap.

(First embodiment)
A hot water storage hot water supply system according to a first embodiment of the present invention will be described with reference to FIG. The hot water storage type hot water supply system 1 includes a hot water supply device 100 that includes a hot water storage tank 2 that stores water supply, and a heating source 3 that heats the water in the hot water storage tank 2. The hot water storage tank 2 and the heating source 3 are connected via a water supply / outflow pipe 4a and a hot water supply pipe 4b. The hot water storage tank 2 has a hot water supply pipe 5a connected to a water supply, for example, and a hot water supply pipe 6 connected to a hot water faucet 60 disposed inside a house, in addition to a water supply outflow pipe 4a and a hot water supply pipe 4b. It is connected. The operations of the hot water supply apparatus 100 and the heating source 3 are controlled by a control unit 9 including a microcomputer or the like that is provided in a house and connected to a control panel (not shown) that can be operated by a user.

  The hot water storage tank 2 is, for example, a sealed cylindrical tank in which the vertical direction is the longitudinal direction and the upper and lower portions are formed in a substantially spherical shape. The inside of the hot water storage tank 2 is filled with hot water having a high temperature, hot water having a temperature lower than that of hot water and higher than that of water supply, and water supply. Inside the hot water storage tank 2, a hot water layer 2a mainly containing hot water is stratified at the upper part, and an intermediate temperature layer 2b mainly containing hot water is stratified at the lower part of the hot water layer 2a. A water supply layer 2c having water supply is formed. That is, the intermediate temperature layer 2b is stratified in the vicinity of the boundary between the hot water layer 2a and the water supply layer 2c. A plurality of temperature sensors 2 h are provided on the side wall of the hot water tank 2 from the upper part to the lower part of the hot water tank 2. The controller 9 can estimate the amount of hot water, hot water, and water supply in the hot water storage tank 2 based on the temperatures detected by these temperature sensors 2h. A water supply outflow pipe 4 a and a water supply pipe 5 a connected to the heating source 3 are connected to the lower part of the hot water storage tank 2. The feed water outflow pipe 4a has a drain pipe 4c branched from a pipe connected to the heating source 3 in the middle of the feed water outflow pipe 4a to a drain outlet (not shown) or the like and provided with a drain valve 4d in the middle. is doing. By opening the drain valve 4d, the water stored in the hot water storage tank 2 can be drained through the drain pipe 4c, so that the maintenance work and the like of the hot water storage type hot water supply system 1 can be easily performed. The water supply pipe 5a is provided with a temperature sensor 5h for measuring the temperature of the water supply and a flow meter 5i for measuring the flow rate of the water supply. As a result, the flow rate and temperature of the feed water flowing into the hot water storage tank 2 as hot water is discharged from the hot water storage tank 2 can be measured. As will be described later, for example, when the water supply amount is large, the controller 9 Operations such as heating water supply (water heating operation) can be automatically executed.

  The heat source 3 is a heat pump using a refrigerant such as carbon dioxide, for example, and heats the water introduced from the water supply layer 2c of the hot water storage tank 2 through the water supply outflow pipe 4a by using heat in the atmosphere. And The heating source 3 includes a built-in pump 3 a that sends heated hot water to the hot water storage tank 2. Hot water heated by the heating source 3 is sent to the hot water storage tank 2 via the hot water supply pipe 4b by the built-in pump 3a. The hot water supply pipe 4 b is connected to the upper part of the hot water storage tank 2, and the hot water sent from the heating source 3 flows into the hot water layer 2 a in the hot water storage tank 2.

  The hot water supply pipe 6 includes a first hot water supply pipe 6 a having one end connected to the upper part of the hot water storage tank 2 and a second hot water supply pipe 6 b having one end connected to the hot water tap 60. The other end of the first hot water supply pipe 6a and the other end of the second hot water supply pipe 6b are both connected to the hot water supply mixing valve 6c. In addition to the 1st hot water supply pipe 6a and the 2nd hot water supply pipe 6b, the hot water supply mixing valve 6c is connected with a water supply mixing pipe 5b branched from the water supply pipe 5a. The hot water supply mixing valve 6c is a mixing valve capable of changing the set temperature under the control of the control unit 9, for example. The hot water mixing valve 6c mixes the hot water in the hot water layer 2a flowing from the first hot water pipe 6a toward the second hot water pipe 6b with the hot water from the hot water mixing pipe 5b according to the set temperature, and the second hot water pipe 6b. It is configured to flow warm water close to the set temperature. In the present embodiment, the length of the first hot water supply pipe 6a is shorter than that of the second hot water supply pipe 6b, so that the hot water in the hot water layer 2a immediately flows into the hot water supply mixing valve 6c when the hot water is discharged from the hot water tap 60. It is configured. A check valve 6d is provided in the vicinity of the hot water supply mixing valve 6c in the second hot water supply pipe 6b so that the water inside the second hot water supply pipe 6b does not flow backward toward the hot water supply mixing valve 6c. The water supply mixing pipe 5b is provided with a check valve 5j so that water does not flow backward from the hot water supply mixing valve 6c toward the water supply pipe 5a. The hot water faucet 60 is attached to, for example, a hot water outlet 110 provided in a house. The hot water outlet 110 is provided with a temperature sensor 6h for measuring the temperature of the hot water in the second hot water pipe 6b.

  Next, the basic operation of the hot water storage type hot water supply system 1 will be described. When the hot-water tap 60 is opened, the water supply pressure flows into the water supply layer 2c of the hot water storage tank 2 through the water supply pipe 5a and the hot water of the hot water layer 2a flows out of the hot water storage tank 2 to the first hot water supply pipe 6a. To do. The hot water that has flowed out to the first hot water supply pipe 6 a is mixed with the hot water supplied from the water supply mixing pipe 5 b by the hot water supply mixing valve 6 c, and becomes hot water having a set temperature set by the control unit 9. Hot water flows through the second hot water supply pipe 6 b and is discharged from the hot water tap 60. At this time, for example, the control unit 9 measures the temperature of hot water actually discharged from the hot water tap 60 by the temperature sensor 6h, and feedback control controls the hot water mixing valve 6c so that the temperature becomes a desired temperature. Adjust the set temperature. That is, in the hot water storage type hot water supply system 1, the hot water having a desired temperature including the hot water of the hot water layer 2 a and higher than that of the hot water can be discharged from the hot water tap 60 by the control of the control unit 9. It is also possible to discharge hot water from the hot water layer 2a from the hot water tap 60 by not mixing the water supply with the hot water mixing valve 6c.

  In addition, the hot water storage hot water supply system 1 has, for example, a predetermined amount of hot water in the hot water storage tank 2 detected based on a measurement result of the temperature sensor 2h, the flow meter 5i, or the like when a predetermined midnight time arrives. When the number is reduced, a water heater operation is performed based on the control of the control unit 9. The water boiling operation is performed by driving the built-in pump 3a while operating the heating source 3. That is, when the built-in pump 3a is driven, the water supply of the water supply layer 2c is introduced into the heating source 3 via the water supply outflow pipe 4a, and when the water supply is made hot by the heating source 3, the hot water is supplied to the hot water supply pipe. Hot water is stored in the hot water layer 2a of the hot water storage tank 2 via 4b. For example, when the predetermined time has arrived, the controller 9 performs a water boiling operation so that even if the temperature of the hot water is slightly lowered by storing hot water for a long time, the temperature can be increased again. In addition, the controller 9 increases the amount of hot water by performing a water heater operation when the amount of hot water actually stored is less than a preset lower limit of the amount of hot water that is normally secured in view of the intended use. Then, the normal state in which a sufficient amount of hot water is secured for the next hot water can be maintained again.

  Here, in the present embodiment, a part of the second hot water supply pipe 6b is included in the circulation path 7 for circulating the water inside the second hot water supply pipe 6b. In FIG. 1, the circulation path 7 is shown by applying a shaded pattern. The circulation path 7 is one of the first circulation pipe 7a and the second circulation pipe 7b, the hot water storage tank 2, and the second hot water supply pipe 6b each having one end connected to the second hot water supply pipe 6b and the other end connected to the hot water storage tank 2. The part forms a closed path. One end of the first circulation pipe 7a is connected to the vicinity of the hot water supply mixing valve 6c in the second hot water supply pipe 6b. In addition, one end of the second circulation pipe 7b is connected to a portion of the second hot water supply pipe 6b near the hot water tap 60 that is closer to the hot water tap 60 side than a portion to which the first circulation pipe 7a is connected. . The other end of the first circulation pipe 7a is connected to a part of the hot water storage tank 2 that is slightly below the part where the intermediate temperature layer 2b is located in a steady state when hot water or the like is not discharged from the hot water tap 60. . The other end of the second circulation pipe 7b is connected, for example, below a portion of the hot water storage tank to which the first circulation pipe 7a is connected. Of the second hot water supply pipe 6b, a hot water supply outlet 110 is provided, and the water in the circulation path 7 is supplied from the first circulation pipe 7a to the second hot water supply pipe 6b and the second circulation at a part of the circulation path 7. A circulation pump 7c for circulating the pipe 7b and the hot water storage tank 2 in order is provided. The second circulation pipe 7b is provided with a check valve 7d for preventing water from flowing in the direction opposite to the direction of water circulation by the circulation pump 7c.

  In the present embodiment, a heat exchanger 70 that connects the first circulation pipe 7 a and the second circulation pipe 7 b and constitutes a part of the circulation path 7 is provided in the hot water storage tank 2. In the water supply layer 2c inside the hot water storage tank 2, the heat exchanger 70 is slightly higher in temperature than the water that flows into the water supply layer 2c from the water supply pipe 5a and is close to the temperature of the hot water in the intermediate temperature layer 2b. It is exposed. The water in the circulation path 7 flows into the hot water storage tank 2 from the second circulation pipe 7b when the circulation pump 7c is driven, but passes through the heat exchanger 70 in the hot water storage tank 2. And the water flows out from the hot water storage tank 2 to the 1st circulation piping 7a, without being mixed with the hot water and water supply which are stored in the hot water storage tank 2. As the water in the circulation path 7 circulates while passing through the heat exchanger 70, the temperature of the water in the circulation path 7 gradually becomes equal to the temperature of the water supply at the site where the heat exchanger 70 is disposed.

  By providing such a circulation path 7, in the hot water storage hot water supply system 1, the water in the second hot water supply pipe 6 b is warmed to about the temperature of the water supply in the portion where the heat exchanger 70 is disposed. (Hereinafter referred to as the "instant water function"). The instant hot water function is particularly effective when the water in the second hot water supply pipe 6b is cold due to heat radiation, such as when no hot water is discharged from the hot water tap 60 for a long time. In the instant hot water function, for example, based on the control of the control unit 9, when the water temperature inside the second hot water supply pipe 6b measured by the temperature sensor 6h becomes equal to or lower than a predetermined circulation start temperature, the circulation pump 7c is driven. Is done. When the circulation pump 7c is driven, the water inside the second hot water supply pipe 6b circulates through the second circulation pipe 7b, the heat exchanger 70, the first circulation pipe 7a, and the second hot water supply pipe 6b in this order. . When the controller 9 is driving the circulation pump 7c, the controller 9 turns the circulation pump 7c on when a predetermined time has passed for the water temperature inside the circulation path 7 to rise after starting the operation of the circulation pump 7c. Stop. Thereby, the water temperature inside the circulation path 7, that is, the water temperature inside the second circulation pipe 7b is equal to or higher than the predetermined circulation start temperature, and the temperature of the relatively warm water supply at the portion where the heat exchanger 70 is disposed. Kept to a degree. The controller 9 may stop the circulation pump 7c when the circulation pump 7c is being driven and the water temperature inside the circulation path 7 reaches a predetermined circulation stop temperature. Further, the control unit 9 may drive the circulation pump 7c at predetermined time intervals only for a predetermined time or until the water temperature in the circulation path 7 reaches a predetermined temperature. Further, the controller 9 may drive the circulation pump 7c only for a predetermined time or until the water temperature in the circulation path 7 reaches a predetermined temperature when a predetermined time arrives.

  Thus, in the present embodiment, the water in the second hot water supply pipe 6b is warmed by the immediate hot water function, so that the water cooled in the second hot water supply pipe 6b when the hot water tap 60 is opened. The hot water faucet 60 can be prevented from coming out. Therefore, the user does not unexpectedly touch cold water, and the hot water storage hot water supply system 1 can be used more comfortably. Further, as described above, in the instant hot water function, unlike the conventional case, the temperature of the water in the second hot water supply pipe 6b is raised without using the hot water of the hot water layer 2a used for hot water from the hot water tap 60. Can do. Therefore, even if the temperature of the hot water to be discharged is close to the temperature of the hot water in the middle temperature layer 2b, for example, the amount of hot water in the hot water storage tank 2 is not reduced by executing the immediate hot water function, and the immediate hot water function is performed. However, since no boiling water operation is required, the amount of energy consumed by the heating source 3 can be reduced, and a sufficient amount of hot water can be used immediately.

  Further, the water circulating in the circulation path 7 passes through the heat exchanger 70 in the hot water storage tank 2 where the water temperature is relatively low below the intermediate temperature layer 2b which is the vicinity of the boundary between the hot water layer 2a and the water supply layer 2c. Via. Therefore, even if the temperature of the water passing through the first circulation pipe 7a, the second hot water supply pipe 6b, and the second circulation pipe 7b is relatively low, the amount of hot water in the hot water layer 2a in the hot water storage tank 2 is not reduced. can do. Furthermore, since the water in the circulation path 7 does not mix with the hot water or the feed water stored in the hot water storage tank 2, the influence of the circulation of the water in the circulation path 7 on the stratified structure in the hot water storage tank 2 can be reduced. The amount of hot water in the hot water storage tank 2 can be maintained more reliably. Furthermore, since the heat exchanger 70 is provided as a part of the circulation path 7 in the hot water storage tank 2, the water in the circulation path 7 can be efficiently warmed to execute the immediate hot water function.

(Second Embodiment)
FIG. 2 shows a hot water storage type hot water supply system according to a second embodiment of the present invention. Below, the same code | symbol is attached | subjected to the component similar to the hot water storage type hot water supply system 1 which concerns on the above-mentioned 1st Embodiment, and only the part which is different from the above-mentioned 1st Embodiment is demonstrated. In the second embodiment, the hot water storage hot water supply system 21 is different from the hot water storage hot water supply system 1 described above in that the hot water supply device 120 having the circulation path 27 is used instead of the hot water supply device 100. The circulation path 27 does not include the heat exchanger 70, and the circulation pump 7c is arranged in the first circulation pipe 7a. In the illustrated hot water storage type hot water supply system 21, the temperature sensor 6 h is not provided in the circulation path 27, and the hot water supply outlet 110 is not provided. It is not restricted to such a structure.

  In 2nd Embodiment, the 1st circulation piping 7a and the 2nd circulation piping 7b are respectively connected to the inside of the hot water storage tank 2 so that inflow and inflow of water is possible. In the circulation path 27, the check valve 7d is provided in each of the first circulation pipe 7a and the second circulation pipe 7b. An opening / closing valve 7e is disposed in the first circulation pipe 7a. The on-off valve 7e is opened only when the immediate hot water function is executed under the control of the control unit 9, and is closed in other cases. The circulation pump 7 c is driven when the immediate hot water function is executed under the control of the control unit 9, and is provided in the circulation path 27 including the first circulation pipe 7 a, the second hot water supply pipe 6 b, the second circulation pipe 7 b, and the hot water storage tank 2. Circulate water.

  When the instant hot water function is executed, when the on-off valve 7e is opened and the circulation pump 7c is driven, the first circulation pipe 7a is supplied with water from the water supply pipe 5a below the middle temperature layer 2b of the hot water storage tank 2. However, relatively hot water flows in. As the high temperature water supply flows from the first circulation pipe 7a to the second circulation pipe 7b via the second hot water supply pipe 6b, the water in the second hot water supply pipe 6b before the immediate hot water function is The water flows out into the feed water having a relatively lower temperature below the portion where the first circulation pipe 7a of the hot water storage tank 2 is connected via the circulation pipe 7b.

  As described above, when the circulating pump 7c is driven and the immediate hot water function is executed, when the hot water tap 60 is opened, first, in the second hot water supply pipe 6b, as in the first embodiment described above. The warm water introduced by the hot water function can come out from the hot water tap 60. Therefore, even when the hot water is not discharged for a long time, the user does not unexpectedly touch the cold water in the second hot water supply pipe 6b, and the hot water storage type hot water supply system 21 can be used comfortably. In addition, the water having a low temperature inside the circulation path 27 before the execution of the immediate hot water function flows into a portion having a relatively low water temperature inside the hot water storage tank 2, so that the amount of hot water inside the hot water storage tank 2 is reduced. It will not decrease.

(Third embodiment)
FIG. 3 shows a hot water storage type hot water supply system according to a third embodiment of the present invention. In 3rd Embodiment, the hot water supply apparatus 140 of the hot water storage type hot-water supply system 41 has the high temperature hot water tap 61 which discharges the hot water of the hot water layer 2a as it is. It differs from the hot water storage type hot-water supply system 1 of 1st Embodiment by the point comprised so that execution of the high temperature quick hot water function different from an immediate hot water function is possible.

  In 3rd Embodiment, the hot water supply apparatus 140 has the 1st hot water supply pipe 46a longer than the 1st hot water supply pipe 6a of the hot water supply apparatus 100 of 1st Embodiment. The high temperature hot water tap 61 is connected to a path branched from a path connected to the hot water mixing valve 6c of the first hot water supply pipe 46a. The other end of the high-temperature circulation pipe 47a, one end of which is connected to the vicinity of the portion where the middle temperature layer 2b of the hot water storage tank 2 is located, is connected to the portion of the first hot water supply pipe 46a in the vicinity of the hot water supply faucet 61. Yes. The high-temperature circulation pipe 47a is provided with an on-off valve 47b, a high-temperature circulation pump 47c, a check valve 47d, and a temperature sensor 47h.

  The high temperature hot water function is executed, for example, when a predetermined time arrives based on the control of the control unit 9. Execution of the high-temperature hot water function is performed by opening the on-off valve 47b and driving the high-temperature circulation pump 47c. When the hot hot water function is executed, the water in the first hot water supply pipe 46a flows into the intermediate temperature layer 2b of the hot water storage tank 2 through the first high temperature circulation pipe 47a by the high temperature circulation pump 47c. Hot water from the hot water layer 2a flows into the first hot water supply pipe 46a. Thereby, even if the water in the 1st hot water supply pipe 46a is cold, the water of the 1st hot water supply pipe 46a can be replaced by the hot water of the hot water layer 2a by the hot hot water hot water function. When the hot water is discharged, the hot water can immediately come out from the hot water supply tap 61.

  In 3rd Embodiment, it is a case where the length of the 1st hot water supply pipe 46a is long compared with the 1st hot water supply pipe 6a etc. of the hot water supply apparatus 100 of the above-mentioned 1st Embodiment, Comprising: Even when the water inside is cold, the water can be replaced with hot water. Accordingly, when hot water is discharged from the hot water tap 60 by executing both the hot hot water function and the quick hot water function of the circulation path 7, cold water is supplied from the hot water tap 60 as in the first embodiment. The effect which prevents coming out is acquired, and hot water of desired temperature can be discharged quickly.

  In addition, this invention is not limited to the structure of the said embodiment, A various deformation | transformation is possible. For example, the heat source is not limited to a heat pump type, and may be configured to turn water into hot water by heating an electric heater or burning oil, gas, or the like. In addition, instead of providing the heat exchanger 70 as a part of the circulation path, a metal pipe or the like that conducts heat between the inside and the outside is used as the first circulation pipe 7a inside the hot water storage tank 2. And the second circulation pipe 7b may be connected.

The block diagram of the hot water storage type hot-water supply system which concerns on the 1st Embodiment of this invention. The block diagram of the hot water storage type hot-water supply system which concerns on the 2nd Embodiment of this invention. The block diagram of the hot water storage type hot-water supply system which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

1,21,41 Hot water storage type hot water supply system 2 Hot water storage tank 7, 27 Circulation path 2a Hot water layer 2c Water supply layer 3 Heating source 4a Water supply outflow pipe 4b Hot water supply pipe 4c Drain pipe 4d Drain valve 6 Hot water supply pipe 7 Circulation path 7a First circulation Piping 7b Second circulation piping 7c Circulation pump 60 Hot water faucet 70 Heat exchanger

Claims (3)

A hot water storage tank for storing hot water and water supply so as to have a hot water layer in the upper part and a water supply layer in the lower part, a water supply outflow pipe connected at one end to the lower part of the hot water storage tank, and connected to the other end of the water supply outflow pipe A heating source that heats the water supplied from the water supply layer to hot water, a hot water supply pipe arranged to supply hot water from the heating source to the hot water layer of the hot water storage tank, the hot water storage tank and the hot water supply A hot-water supply hot water supply pipe that connects the faucet, and is capable of discharging hot water of the hot water layer or hot water of the hot water layer having a temperature higher than that of the hot water from the hot water tap through the hot water supply pipe. In the system,
A first circulation pipe having one end connected to the hot water storage tank and the other end connected to the hot water supply pipe;
A second circulation pipe having one end connected to the hot water storage tank and the other end connected to a part closer to the hot water faucet side than a part to which the first circulation pipe of the hot water supply pipe is connected;
The hot water storage tank is disposed in a circulation path composed of a first circulation pipe, a second circulation pipe, and a hot water supply pipe, and water in the circulation path is supplied from the first circulation pipe to the hot water supply pipe, the second circulation pipe, A hot water storage hot water supply system, further comprising a circulation pump that circulates through the hot water storage tank in order.   One end of the first circulation pipe and the second circulation pipe is connected to a lower part of the hot water storage tank than a portion where the hot water layer is normally located, so that the circulation pump is driven when the circulation pump is driven. The hot water storage hot water supply system according to claim 1, wherein the temperature of the water in the path is configured to be lower than the temperature of the hot water in the hot water layer and higher than the temperature of the water supply.   A heat exchanger that connects the first circulation pipe and the second circulation pipe is provided inside the hot water storage tank, whereby the hot water in which the water in the circulation path is stored in the hot water storage tank. Or it is comprised so that it may not mix with water supply, The hot water storage type hot-water supply system of Claim 1 or Claim 2 characterized by the above-mentioned.

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