JP6646024B2 - Hot water supply system - Google Patents

Description

The present invention relates to a hot water supply system.

  2. Description of the Related Art Conventionally, a hot water supply system using renewable energy such as solar heat has been known, and for example, it has been proposed to use it in schools and corporate dormitories, hotels, and nursing facilities. The hot water supply system includes a solar heat collecting system that collects solar heat, and a hot water storage tank that stores hot water heated by the collected solar heat and supplies the hot water to a hot water supply destination. In addition, the hot water supply system includes a heating unit that heats the hot water in the hot water tank when the temperature of the hot water in the hot water tank is low due to lack of solar heat. As the heating unit, a heat exchanger that exchanges heat between a heat medium heated by an external heat source and hot water in a hot water tank is used.

  For example, Patent Document 1 discloses a system configuration including a solar heat collector, a heat storage tank, a heat exchanger for supplying hot water, a hot water storage tank, and an auxiliary boiler. According to Patent Literature 1, the heat energy collected by the solar heat collector is stored in the heat storage tank, and the heat stored in the heat storage tank is transferred to the hot water tank via the hot water supply heat exchanger. . When the heating is insufficient, the auxiliary boiler is operated, and the hot water in the hot water storage tank is heated.

JP 2004-012025 A

  By the way, in this type of hot water supply system, if the amount of heat collected by solar heat, the amount of hot water used, and the hot water usage time zone are within the design range, the hot water stored in the hot water tank has the necessary thermal energy. There is no shortage of hot water. However, when the amount of heat collected is insufficient, the amount of hot water used is excessive, or hot water is used during irregular hours, the temperature of hot water in the hot water storage tank is low, and there is a problem that hot water cannot be supplied. .

The present invention has been made in view of such circumstances, and its object is to provide a hot water supply system capable of performing hot water supply stably.

In order to solve such a problem, the hot water supply system according to the present invention includes a main hot water chamber partitioned in the interior of the tank body to store the hot water, separately partitioned from the main hot water chamber to an inner portion of the tank body, the main hot water Of the hot water stored in the room , a hot water in a high-temperature area flows into the sub hot water chamber for storing the hot water, a main temperature sensor for detecting the temperature of the main hot water chamber, and a sub hot water chamber is provided and stored in the sub hot water chamber. A heating section for heating the supplied hot water and a water supply pipe for supplying water are configured to be connectable, and a water supply introduction section for introducing water supplied from the water supply pipe into the main hot water chamber, and hot water supply for supplying hot water to a hot water supply destination. A first hot water supply unit configured to connect a pipe and introducing hot water stored in the sub hot water chamber to the hot water supply pipe, and a hot water supply pipe configured to be connectable and introducing hot water stored in the main hot water chamber to the hot water supply pipe. And the second hot water supply unit A hot water switching control valve for switching between hot water from the first hot water supply unit and hot water from the second hot water supply unit, a heat storage tank for storing a heat medium heated by solar heat, and heat stored in the heat storage tank. Based on the heat exchanger that performs heat exchange between the medium and the hot and cold water stored in the main hot and cold water chamber, and based on the detection result of the main temperature sensor, it was determined that the hot and cold water in the main hot water chamber reached the design hot water supply temperature. In this case, the hot water in the main hot water chamber is passed through the hot water supply pipe, and if it is determined that the water or hot water in the main hot water chamber has not reached the design hot water supply temperature, the water or hot water in the sub hot water chamber is heated by the heating unit. And a controller for controlling the driving of the hot and cold water switching control valve so as to pass through the hot water supply pipe .

In the case of the onset bright, water introduction unit includes a diffuser tube for blowing in the deceleration state and dispersed state water supply is disposed below in the main hot water chamber, the second hot-water supply unit, the upper in the main hot water chamber is disposed, it is preferable to provide a diffuser tube for sucking the hot water in the main hot water chamber in the deceleration state and dispersed state.

Further, in the present invention, it is preferable that the sub water chamber is formed by a partition provided in the tank main body to partition the inside of the tank main body. In this case, the partition wall is arranged so as to surround the heating unit, and is arranged between the first vertical wall constituting the heating chamber extending in the up-down direction and the first vertical wall. And a second vertical wall constituting an introduction chamber extending in the up-down direction, and a communication portion for communicating the heating chamber and the introduction chamber is preferably provided at a lower end of the first vertical wall. . The supply of hot water to the sub hot water chamber is such that, of the hot water stored in the main hot water chamber , the upper hot water overflows the upper end of the second vertical wall, flows into the introduction chamber, and moves the introduction chamber downward from above. After flowing into the heating chamber through the communicating portion, it is preferable to perform the heating.

Further, Oite the present invention, the controller controls the driving of the water supply control valve in order to adjust so that the range of the water supply to flow into the tank body from the lower limit water level of the tank body to the upper limit water level, the second vertical wall Is set lower than the lower limit water level .

  According to the present invention, since the sub water chamber is provided inside the tank main body, hot water can be supplied stably.

The figure which shows typically the structure of the hot-water supply system which concerns on this embodiment. Plan view schematically showing the configuration of a hot water storage tank The figure which shows typically the cross section of the hot-water storage tank along the AA line of FIG. The figure which shows typically the cross section of the hot-water storage tank along the BB line of FIG. Plan view schematically showing the configuration of a hot water storage tank in a modified example The figure which shows typically the cross section of the hot-water storage tank along the AA line of FIG. The figure which shows typically the cross section of the hot-water storage tank along the BB line of FIG.

  Hereinafter, the hot water supply system 1 according to the present embodiment will be described. Here, FIG. 1 is a diagram schematically illustrating a configuration of a hot water supply system 1 according to the present embodiment. The hot water supply system 1 is a system that stores hot water heated by a solar heat collecting system 2 in a hot water storage tank 3 and supplies the stored hot water to a hot water supply port 6 of a hot water supply destination. The hot water supply system 1 mainly includes a solar heat collecting system 2, a hot water storage tank 3, a hot water supply port 6, and a controller 8.

  The solar heat collecting system 2 is a system that collects solar heat and stores the collected solar heat. The solar heat collecting system 2 mainly includes a solar heat collector 20, heat medium pipes 21 and 22, a heat storage tank 23, and a heat exchanger 25.

  The solar heat collector 20 heats a heat medium by solar heat. The solar heat collector 20 is installed in a sunny place such as a roof or a veranda. As the heat medium, water, antifreeze (for example, propylene glycol aqueous solution) or the like is used.

  The heat medium pipes 21 and 22 are pipes connecting between the solar heat collector 20 and the heat storage tank 23, and have a configuration in which the heat medium flows therein. One heat medium pipe 21 is a pipe through which a heat medium (heated heat medium) flows from the solar heat collector 20 to the heat storage tank 23, and the other heat medium pipe 22 is a pipe from the heat storage tank 23 to the solar heat collector 20. Is a pipe through which a heat medium flows. The heat medium pipe 22 is provided with a heat collecting pump 24 serving as a driving source for circulating the heat medium. By driving the heat collecting pump 24, the heat medium circulates between the solar heat collector 20 and the heat storage tank 23.

  The heat storage tank 23 stores heat held by the heat medium, that is, heat collected by the solar heat collector 20. The heat storage tank 23 is configured by a tank that stores therein a heat medium supplied from the heat medium pipe 21.

  The heat storage tank 23 is provided with a heat exchanger 25. The heat exchanger 25 exchanges heat between the heat medium stored in the heat storage tank 23 and hot water supplied from the hot water storage tank 3. The heat exchanger 25 heats the hot water supplied from the hot water storage tank 3 through this heat exchange.

  The heat storage tank 23 is provided with a hot and cold water inlet 23 a to which one end of the heat exchanger 25 is connected. A hot water pipe 26 through which hot water flows from the hot water storage tank 3 is connected to the hot water introduction section 23a. The heat exchanger 25 and the hot water pipe 26 are connected via the hot water introduction part 23a. Further, the heat storage tank 23 is provided with a hot water return portion 23b to which the other end of the heat exchanger 25 is connected. A hot water return pipe 27 through which hot water from the heat exchanger 25 flows is connected to the hot water return section 23b. The heat exchanger 25 and the hot and cold return pipe 27 are connected via the hot and cold return part 23b. A hot-water pump 28 serving as a drive source for circulating hot water is provided in the hot-water pipe 26. By driving the hot water pump 28, hot water circulates between the heat exchanger 25 of the heat storage tank 23 and the hot water storage tank 3, and the heat stored in the heat storage tank 23 is transferred to the hot water storage tank 3.

  The hot water storage tank 3 stores hot water and supplies the stored hot water. Hot water storage tank 3 includes a water supply introduction unit 41, a water supply outlet 42, a water supply unit 43, a main water supply unit 44, a sub-water supply unit 45, and a water supply return unit 47.

The water supply introduction unit 41 is connected to a water supply pipe (water pipe) 70 through which water (tap water) supplied from a water supply company flows. The water supplied from the water supply pipe 70 is introduced into the hot water storage tank 3 via the water supply introduction part 41. A first control valve 80 (water supply control valve) for controlling water supplied to the hot water storage tank 3 is provided on a path of the water supply pipe 70 reaching the water supply introduction part 41.

  The hot and cold water outlet 42 is connected to a hot and cold water pipe 26 that is connected to the heat exchanger 25 in the heat storage tank 23. The hot water stored in the tank body 30 flows out to the hot water pipe 26 through the hot water outlet 42.

  The hot water return section 43 is connected to the hot water return pipe 27 connected to the heat exchanger 25 in the heat storage tank 23. The hot and cold water flowing through the hot and cold return pipe 27 flows out to the tank body 30 via the hot and cold return section 43.

  The main hot water supply section (second hot water supply section) 44 and the sub hot water supply section (first hot water supply section) 45 are connected to a hot water supply pipe 60 described later. The hot water stored in hot water storage tank 3 flows out to hot water supply pipe 60 via main hot water supply section 44 or sub-hot water supply section 45. The hot water supply return section 47 is connected to a hot water supply return pipe 61 described later.

  Hereinafter, the structure of the hot water storage tank 3 which is one of the features of the present embodiment will be described in detail. Here, FIG. 2 is a plan view schematically showing the configuration of the hot water storage tank 3. FIG. 3 is a diagram schematically showing a cross section of the hot water storage tank 3 along the line AA in FIG. 2, and FIG. 4 is a diagram schematically showing a cross section of the hot water storage tank 3 along the line BB in FIG. is there.

  Hot water storage tank 3 is mainly composed of tank main body 30, partition wall 31, main heat exchanger 35 and sub heat exchanger 36.

  The tank main body 30 is a tank formed of a member having excellent heat insulating properties, and has a space (water chamber) for storing hot water therein. The tank main body 30 is formed of, for example, a hexahedron including an upper surface 30a, a lower surface 30b, and four side surfaces 30c. The tank main body 30 is provided with the above-described water supply introduction part 41, water supply / exit part 42, water / water return part 43, main water supply part 44, sub-water supply part 45, and water supply / return part 47, respectively.

  The partition wall 31 is provided inside the tank main body 30. The partition 31 partitions the inside of the tank main body 30 to form a sub hot water chamber Rs inside the tank main body 30. The sub water chamber Rs is set to a smaller volume than the entire volume of the tank main body 30, for example, a volume of about 10% of the entire tank main body 30. In order to distinguish the sub water chamber Rs from the space inside the tank body 30 (the space excluding the sub water chamber Rs), the latter space is referred to as a main water chamber Rm. That is, the partition 31 separates the main hot water chamber Rm and the sub hot water chamber Rs.

  In the present embodiment, the partition wall 31 is provided at a corner 30d of the tank main body 30, that is, a continuous portion of two side surfaces 30c adjacent to each other. The partition wall 31 includes a first vertical wall 32 and a second vertical wall 33.

  The first vertical wall 32 has a substantially L-shaped cross section in the horizontal direction, and extends along the up-down direction. The first vertical wall 32 is disposed so as to surround the corner 30d, and two end sides 32a along the vertical direction are joined to two side surfaces 30c forming the corner 30d. The first vertical wall 32 forms a required space extending in the vertical direction (hereinafter, referred to as “heating chamber Rs1”). The heating chamber Rs1 forms a part of the sub water chamber Rs.

  The lower end of the first vertical wall 32 does not reach the lower surface 30b of the tank body 30, and a communication portion 32b as a gap is formed between the lower end and the lower surface 30b. The heating chamber Rs1 communicates with a space outside the first vertical wall 32 via the communication portion 32b. On the other hand, the upper end of the first vertical wall 32 has reached a level higher than the upper limit water level L1 of the hot water stored in the tank body 30.

  The second vertical wall 33 has a substantially L-shaped cross section in the horizontal direction, and extends along the up-down direction. The second vertical wall 33 is disposed so as to surround the first vertical wall 32 with a predetermined gap therebetween, and two end sides 33a along the up-down direction are arranged with respect to two adjacent side surfaces 30c. Are joined. The second vertical wall 33 forms a required space (hereinafter, referred to as “introduction chamber Rs2”) extending vertically with the first vertical wall 32. This introduction chamber Rs2 constitutes a part of the sub hot water chamber Rs. That is, the sub hot water chamber Rs includes the heating chamber Rs1 and the introduction chamber Rs2.

  The lower end of the second vertical wall 33 reaches the lower surface 30b of the tank body 30 and is joined to the lower surface 30b. On the other hand, the upper end of the second vertical wall 33 is set to a height lower than the lower limit L2 of the hot water stored in the tank body 30.

  Of the hot and cold water stored in the main hot and cold water chamber Rm, the upper hot water (water above the lower limit water level L2) overflows the upper end of the second vertical wall 33 and flows into the introduction chamber Rs2. Then, the hot and cold water flowing into the introduction chamber Rs2 flows from the upper part to the lower part in the introduction chamber Rs2, and then flows into the heating chamber Rs1 via the communication part 32b provided at the lower end of the first vertical wall 32. Thus, the upper layer of hot water flowing from the main hot water chamber Rm is stored in the sub hot water chamber Rs. As described above, the sub-hot-water chamber Rs has a function of flowing the upper-level hot water out of the hot-water stored in the main hot-water chamber Rm, and storing the inflowing hot water.

  The main heat exchanger 35 exchanges heat between hot water stored in the main hot water chamber Rm and steam supplied from the main steam pipe 50. The main heat exchanger 35 heats the hot water stored in the main hot water chamber Rm through heat exchange. The hot and cold water stored in the main hot water chamber Rm is heated by the heat of the heat storage tank 23. In addition to this, the hot water can be heated using steam (boiling with steam). The main heat exchanger 35 is arranged below the main hot and cold water chamber Rm, specifically, at a position close to the lower surface 30b.

  Surplus steam from a boiler or the like is supplied to the main steam pipe 50. The main steam pipe 50 is connected to one end of the main heat exchanger 35. The main steam pipe 50 is provided with a second control valve 81 for controlling the steam supplied to the main heat exchanger 35. On the other hand, a discharge pipe 51 is connected to the other end of the main heat exchanger 35. The discharge pipe 51 is provided with a steam trap 53 for discharging the condensed water condensed in the main heat exchanger 35 and a condensed water tank 54 for storing the condensed water.

  The sub heat exchanger 36 exchanges heat between hot water stored in the sub hot water chamber Rs and steam supplied from the sub steam pipe 52. The sub heat exchanger 36 heats the hot water stored in the sub hot water chamber Rs through heat exchange (heating unit). The sub heat exchanger 36 is disposed inside the heating chamber Rs1 so as to be surrounded by the first vertical wall 32.

  Surplus steam from a boiler or the like is supplied to the sub-steam pipe 52. In the present embodiment, the sub-steam pipe 52 is realized as a pipe branched from the main steam pipe 50. The sub-steam pipe 52 is connected to one end of the sub heat exchanger 36. The sub-steam pipe 52 is provided with a third control valve 82 for controlling steam supplied to the sub-heat exchanger 36. On the other hand, a discharge pipe 51 is connected to the other end of the sub heat exchanger 36.

  In the hot water storage tank 3 having such a configuration, the main hot water supply chamber Rm is provided with the above-described water supply introduction unit 41, the hot water outlet unit 42, the hot water return unit 43, and the main hot water supply unit 44.

  The water supply introduction unit 41 is disposed below the main hot water chamber Rm, specifically, adjacent to above the main heat exchanger 35. The water supply introduction unit 41 includes a diffuser pipe 41a that blows out water supplied from the water supply pipe 70 in a decelerated state and a dispersed state. For example, the diffuser pipe 41a includes a pipe main body extending in the horizontal direction, and a plurality of outlets (small holes) arranged at a predetermined pitch in the longitudinal direction of the pipe main body. The plurality of outlets are set on the lower side of the pipe main body so as to blow out feedwater toward the main heat exchanger 35.

  The hot and cold water outlet portion 42 is arranged at a position below the side surface 30 c forming the tank main body 30. On the other hand, the hot and cold water return portion 43 is disposed above the same side surface 30 c as the hot and cold water outlet portion 42. Thus, the hot / cold water return portion 43 is positioned above the hot / cold water outlet portion 42.

  The main hot water supply unit 44 is disposed above the main hot water chamber Rm, specifically, at a position slightly lower than the lower limit water level L2. The main hot water supply unit 44 includes a diffuser pipe 44a that sucks hot and cold water stored in the main hot water chamber Rm in a decelerated state and in a dispersed state. For example, the diffuser pipe 44a includes a pipe body extending in the horizontal direction, and a plurality of suction ports (small holes) arranged at a predetermined pitch in the longitudinal direction of the pipe body. In this case, the plurality of suction ports are set below the pipe body.

  On the other hand, in the heating chamber Rs1 of the sub hot water chamber Rs, a sub hot water supply section 45 and a hot water return section 47 are provided. The sub water heater 45 is disposed above the sub water chamber Rs, and the hot water return unit 47 is disposed below the sub water chamber Rs.

  Referring to FIG. 1 again, the hot water supply port 6 is installed in a facility to which hot water is supplied and discharges hot water, and corresponds to, for example, a shower in a bathroom in a dormitory building. A hot water supply pipe 60 and a water supply pipe 70 are connected to the hot water supply port 6. The hot water supply port 6 mixes hot water supplied from the hot water supply pipe 60 and water supplied from the water supply pipe 70 at a ratio according to the hot water temperature required by the user, and discharges the mixed water.

The hot water supply pipe 60 is a pipe that supplies hot water supplied from the hot water storage tank 3 via the main hot water supply section 44 or the sub hot water supply section 45 to the hot water supply port 6 as a hot water supply destination. Independent hot water supply pipes 60 are connected to the main hot water supply section 44 and the sub hot water supply section 45, respectively, and these hot water supply pipes 60 subsequently merge to reach the hot water supply port 6. At the junction of the hot water supply pipe 60, a fourth control valve 83 (a hot water switching control valve ) that switches the hot water path between the main hot water supply section 44 (main hot water chamber Rm) side and the sub hot water supply section 45 (sub hot water chamber Rs) side. ) Is provided. Further, a hot water supply pump 62 for discharging hot water supplied from the hot water storage tank 3 toward the hot water supply port 6 is provided downstream of the fourth control valve 83. Further, a pressure tank 63 is provided downstream of the hot water supply pump 62.

  Hot water supply pipe 60 is connected to a hot water supply return pipe 61 that returns a part of hot water supplied to hot water supply port 6 to hot water storage tank 3. The hot water supply return pipe 61 is provided with a fifth control valve 84 for maintaining the temperature of hot water.

  The controller 8 is a control unit that controls the hot water supply system 1. Signals from various sensors and the like are input to the controller 8 as control inputs. Controller 8 performs various calculations based on the control input, and outputs a control output according to the calculation results to each unit of hot water supply system 1. As the controller 8, a microcomputer mainly composed of a CPU, a ROM, a RAM, and an I / O interface can be used.

  In relation to the present embodiment, the upper limit level sensor 90 detects the upper limit water level L1 of the hot water stored in the hot water tank 3. Lower limit level sensor 91 detects lower limit water level L2 of the hot water stored in hot water storage tank 3. The controller 8 refers to the detection signals of the upper limit level sensor 90 and the lower limit level sensor 91, and controls the first control valve 80 such that the hot water stored in the hot water tank 3 is in a range from the lower limit water level L2 to the upper limit water level L1. . Specifically, the controller 8 opens the first control valve 80 when the water level of the hot water stored in the hot water storage tank 3 decreases due to the use of the hot water supply and the water level reaches the lower limit water level L2, and the main hot water chamber Rm Supply of water to The water level in the main hot water chamber Rm rises due to the water supplied from the water supply pipe 70, and when the water level reaches the upper limit water level L1, the first control valve 80 is closed to stop the water supply.

  The main temperature sensor 92 detects the temperature of hot water in the main hot water chamber Rm. Sub temperature sensor 93 detects the temperature of hot water in sub hot water chamber Rs. The controller 8 controls the second control valve 81, the third control valve 82, and the fourth control valve 83 with reference to the detection signals of the main temperature sensor 92 and the sub temperature sensor 93.

  Hereinafter, the operation of the hot water supply system 1 according to the present embodiment will be described in accordance with a specific use situation. First, the hot water supply system 1 is applied to a dormitory building of a school and a company. In the hot water supply system 1 used in the dormitory building, hot water supply is concentrated in the time period from 6.30 pm to 10:00 pm (hot water use time period), and most of the hot water supply is used in this hot water use time period. Tend to The operation (heat collection) of the solar heat collection system 2 ends at about 3:00 pm. Considering the transfer of heat from the heat storage tank 23 to the hot water storage tank 3, the start time of hot water supply is 6:00 pm. When these are shown in a one-day schedule, the heat collecting time zone by the solar heat collecting system 2 is from 9:00 am to 3:30 pm, and the heat transfer from the heat storage tank 23 to the hot water storage tank 3 is from 3:00 pm to pm Until 5:00, boiling water with steam is from 4:30 pm to 6:00 pm. When the amount of heat collected by solar heat is as designed, the temperature of the hot water stored in hot water storage tank 3 reaches the designed hot water supply temperature by 6:00 pm. When the amount of hot water used is as designed, the heat (hot water) stored in hot water storage tank 3 can be used up without any problem during the hot water usage time zone.

  By the way, the solar heat collecting system 2 utilizes a natural phenomenon, and a desired heat collecting amount may not be obtained depending on the weather. Since the hot and cold water in the hot water storage tank 3 remains at the temperature of the hot water supply, even if the hot water is boiled from this temperature, there is a possibility that the hot water temperature will not reach the designed hot water supply temperature by 6:00 pm (start time of hot water supply use). .

  Therefore, the controller 8 detects the temperature of the hot and cold water in the main hot water chamber Rm by the main temperature sensor 92 at a predetermined time before the hot water supply start time, for example, at 5:45 pm. When this temperature has not reached the design hot water supply temperature, the fourth control valve 83 is controlled to switch the hot water path from the hot water storage tank 3 to the sub hot water supply unit 45 side. By this switching, the hot water supply source becomes the sub hot water chamber Rs. Further, the controller 8 opens the third control valve 82 and supplies steam to the sub heat exchanger 36. After supplying the steam to the sub heat exchanger 36, the controller 8 detects the temperature of the hot water in the sub hot water chamber Rs by the sub temperature sensor 93. Then, the controller 8 controls the third control valve 82 to adjust the supply of steam to the sub heat exchanger 36 so that the temperature of the hot water in the sub hot water chamber Rs maintains the designed hot water supply temperature. Thereby, stable hot water supply can be performed.

  Further, even when the hot water storage tank 3 has the designed amount of heat (hot water) at the start time of hot water use, the hot water use amount exceeds the design hot water use amount depending on the subsequent hot water use condition, and the design is not good. Even within the hot water supply usage time range, the heat (hot water) in the hot water storage tank 3 may be completely used up. In this case, since the temperature of the hot water in the hot water storage tank 3 has dropped to the temperature of the hot water, the hot water cannot be used even during the hot water usage time period in the design. For example, even before 10 pm, hot water cannot be used. Similarly, even when the amount of hot water used is as designed as the amount of hot water used, the amount of hot water used reaches the designed amount of hot water used after the hot water usage time zone in the design. In this case, since the temperature of the hot water in the hot water storage tank 3 has dropped to the temperature of the hot water supply, the hot water cannot be used outside of the hot water supply usage time period in design. For example, hot water cannot be used at night or in the morning.

  Therefore, the controller 8 detects the temperature of the hot water in the main hot water chamber Rm by the main temperature sensor 92 at a predetermined cycle after the start time of using the hot water supply. Then, when this temperature is lower than the design hot water supply temperature, the fourth control valve 83 is controlled to switch the hot water path from the hot water storage tank 3 to the sub hot water supply unit 45 side. By this switching, the hot water supply source becomes the sub hot water chamber Rs. Further, the controller 8 opens the third control valve 82 and supplies steam to the sub heat exchanger 36. After supplying the steam to the sub heat exchanger 36, the controller 8 detects the temperature of the hot water in the sub hot water chamber Rs by the sub temperature sensor 93. Then, the controller 8 controls the third control valve 82 to adjust the supply of steam to the sub heat exchanger 36 such that the temperature of the hot water in the sub hot water chamber Rs maintains the designed hot water supply temperature. Thus, stable hot water supply can be performed even when the hot water usage exceeds the designed hot water usage or during a time other than the designed hot water usage time zone.

  As described above, according to the structure of the hot water storage tank 3 of the present embodiment, the hot and cold water stored in the sub hot water chamber Rs can be individually boiled. Thereby, hot water for hot water supply can be secured. Therefore, even in a case where desired hot water cannot be supplied from the main hot water chamber Rm, hot water can be supplied from the sub hot water chamber Rs. As a result, hot water can be supplied stably.

  In the present embodiment, the sub water chamber Rs has a smaller volume than the main water chamber Rm. Therefore, boiling of hot water can be carried out with good instantaneousness. As a result, it is possible to immediately respond to the hot water supply request, so that the hot water can be stably supplied.

  By the way, as a countermeasure to the above-mentioned problem, it is conceivable to advance the boiling time of the hot water storage tank 3 without providing the sub hot water chamber Rs. However, this results in excessive heat being applied to the hot water storage tank 3. Therefore, an imbalance occurs between the amount of hot water used and the amount of heat (hot water) stored in the hot water storage tank 3 cannot be completely used up, and this heat is carried over to the next day. In this case, part of the heat collected by the solar heat is not transferred to the hot water storage tank 3, which leads to a decrease in the solar heat utilization rate.

  In this regard, according to the present embodiment, only the sub hot water chamber Rs is boiled, and the hot water in the main hot water chamber Rm is maintained as supplied. Further, the volume of the sub hot water chamber Rs is extremely small. This makes it difficult for the heat in the hot water storage tank 3 to be carried over to the next day, thereby increasing the utilization rate of solar heat.

  In the present embodiment, the supply of water into the main hot water chamber Rm is performed via a water supply introduction unit 41 provided with a diffuser pipe 41a disposed at a lower portion in the main hot water chamber Rm. The outflow of hot water from the main hot water chamber Rm is performed via a main hot water supply unit 44 with a diffuser pipe 41a disposed at an upper part in the main hot water chamber Rm. Thus, the water supplied from the water supply introduction unit 41 is slowly introduced into the main hot water chamber Rm in the entire region in the horizontal direction. Similarly, the hot water flowing out of the main hot water chamber Rm is slowly sucked into the main hot water supply section 44 in the entire region in the horizontal direction. Accordingly, a flow (piston flow) that is pushed upward from below is formed in the main hot water chamber Rm with the general movement of the hot water caused by the introduction of the supply water and the outflow of the hot water. Due to this flow, the hot water present in the main hot water supply unit 44 is not agitated, and the temperature distribution from low temperature to high temperature is formed from below to above. As a result, the upper layer of hot water stored in the main hot water chamber Rm, that is, hot water in a high temperature region, flows into the sub hot water chamber Rs. In particular, the hot water in the high temperature region corresponds to the relatively hot water that could not be boiled up by the main heat exchanger 35. Therefore, in the sub water chamber Rs, only the shortage of the temperature that has not been heated by the main heat exchanger 35 needs to be heated. Thereby, it is possible to efficiently perform the boiling in the sub heat exchanger 36.

  Further, according to the present embodiment, the hot and cold water return portion 43 is positioned above the hot and cold water outlet portion 42. According to this configuration, the hot and cold water heated by the solar heat is returned to the upper layer of the main hot water chamber Rm. Thus, the formation of a temperature distribution from low temperature to high temperature from lower to higher can be boosted.

  In the present embodiment, the sub water chamber Rs is formed by the partition wall 31 including the first vertical wall 32 and the second vertical wall 33. The supply of hot water to the sub hot water chamber Rs is such that the hot water in the upper layer of the hot water stored in the main hot water chamber Rm overflows the upper end of the second vertical wall 33 and flows into the introduction chamber Rs2. After flowing from above to below, it is performed by flowing into the heating chamber Rs1 via the communication portion 32b.

  According to this configuration, by using the overflow structure, the upper layer of hot water stored in the main hot water chamber Rm flows into the sub hot water chamber Rs. As described above, the hot water in the high temperature range exists in the upper layer of the main hot water chamber Rm. Thereby, the hot and cold water in the high temperature range can be appropriately made to flow into the sub hot water chamber Rs. As a result, the water can be efficiently boiled by the sub heat exchanger 36.

  In the present embodiment, the sub water chamber Rs is formed by partitioning the inside of the tank main body 30 with the partition wall 31. Although the side wall 30c of the tank main body 30 is used, the sub water chamber Rs may be formed only by the partition wall 31. For example, the first vertical wall 32 and the second vertical wall 33 are each formed of a cylindrical body.

  Further, the configuration of the sub hot water chamber Rs may employ any structure as long as hot water in a high-temperature region flows in and is stored in the main hot water chamber Rm. Here, FIG. 5 is a plan view schematically showing a configuration of a hot water storage tank 3 according to a modification. 6 is a diagram schematically showing a cross section of the hot water storage tank 3 along the line AA in FIG. 5, and FIG. 7 is a diagram schematically showing a cross section of the hot water storage tank 3 along the line BB in FIG. is there.

  The hot water storage tank 3 according to this modification has a different structure for partitioning the sub hot water chamber Rs, and includes an internal tank 37 instead of the partition wall 31. The inner tank 37 is a box-shaped container, and includes a cylindrical peripheral side wall 38 that is open in the vertical direction, and a bottom plate 39 that closes a lower part of the peripheral side wall 38. That is, the sub water chamber Rs is configured by partitioning the inside of the tank main body 30 by the peripheral side wall 38 and the bottom plate 39 forming the internal tank 37.

  The internal tank 37 is disposed above the inside of the tank main body 30, and is disposed in a region where the upper layer of hot water exists in the hot water stored in the tank main body 30. The peripheral side wall 38 constituting the internal tank 37 has a lower end located at a position lower than the lower limit water level L2 of the hot water stored in the tank main body 30, while an upper end thereof has an upper limit water level L1 of the hot water stored in the tank main body 30. At a higher position.

  A plurality of small holes are formed in the peripheral side wall 38 and the bottom plate 39, and the hot water of the upper layer of the tank body 30 flows into the internal tank 37 through these small holes. A sub heat exchanger 36 is arranged inside the internal tank 37, and the hot and cold water flowing into the internal tank 37 can be heated by the sub heat exchanger 36.

  Even with such a configuration, the sub hot water chamber Rs can be configured similarly to the above-described embodiment.

  As described above, the hot water storage tank and the hot water supply system according to the present embodiment have been described. However, it is needless to say that the present invention is not limited to this embodiment, and various changes can be made within the scope of the present invention.

  For example, in the present embodiment, the heat stored in the heat storage tank is used only for hot water supply, but may be used for air conditioning or the like.

REFERENCE SIGNS LIST 1 hot water supply system 2 solar heat collecting system 20 solar heat collector 23 heat storage tank 25 heat exchanger 3 hot water storage tank 30 tank body 31 partition 32 first vertical wall 32a edge 32b communication portion 33 second vertical wall 33a edge 35 main heat Exchanger 36 Sub heat exchanger (heating unit)
37 Internal tub 38 Peripheral side wall 39 Bottom plate 41 Water supply inlet 41a Diffuser pipe 42 Hot water outlet 43 Hot water return 44 Main hot water supply (second hot water supply)
44a Diffuser pipe 45 Sub hot water supply section (first hot water supply section)
47 hot water supply return section 50 main steam pipe 51 discharge pipe 52 sub steam pipe 60 hot water supply pipe 61 hot water supply return pipe 62 hot water supply pump 63 pressurized tank 70 water supply pipe 8 controller 80 to 84 control valve 90 upper limit level sensor 91 lower limit level sensor 92 main temperature Sensor 93 Sub temperature sensor Rm Main hot water chamber RS Sub hot water chamber Rs1 Heating chamber Rs2 Introducing chamber

Claims (4)

A main hot water chamber partitioned inside the tank body that stores hot water,
The vessel wherein the main hot water chamber to an inner portion of the main body is partitioned separately from the sub hot water chamber to store the hot water by flowing hot water of high temperature range of the hot water that is stored in the main hot water chamber,
A main temperature sensor for detecting a temperature of the main hot water chamber,
A heating unit provided in the sub-bathroom, for heating the hot water stored in the sub-bathroom;
A water supply pipe configured to connect a water supply pipe for supplying water, and a water supply introduction unit configured to introduce water supplied from the water supply pipe into the main hot water chamber,
A first hot water supply unit configured to be connectable with a hot water supply pipe for supplying hot water to a hot water supply destination, and introducing hot water stored in the sub hot water chamber into the hot water supply pipe;
A second hot water supply unit configured to be connectable to the hot water supply pipe and introducing hot water stored in the main hot water supply chamber into the hot water supply pipe;
A hot and cold water switching control valve for switching between hot water from the first hot water supply unit and hot water from the second hot water supply unit;
A heat storage tank for storing a heat medium heated by solar heat,
A heat exchanger that performs heat exchange between the heat medium stored in the heat storage tank and the hot and cold water stored in the main hot water chamber,
When it is determined based on the detection result of the main temperature sensor that the hot water in the main hot water chamber has reached the design hot water supply temperature, the hot water in the main hot water chamber is passed through the hot water supply pipe, If it is determined that the water or hot water has not reached the design hot water supply temperature, the hot water switching control valve is heated so that the water or hot water in the sub hot water chamber is heated by the heating unit and passed through the hot water supply pipe. A controller for controlling the driving;
Hot water supply system with The water supply inlet section includes a diffuser tube for blowing out water is disposed below in the main hot water chamber in the deceleration state and dispersed state,
The second hot water supply unit, hot water supply system of claim 1, comprising a diffuser tube for sucking the hot water in the main hot water chamber is arranged above in the main hot water chamber in the deceleration state and dispersed state. The sub water chamber is formed by a partition wall provided in the tank main body to partition the inside of the tank main body,
The partition,
A first vertical wall that is arranged so as to surround the heating unit and constitutes a heating chamber that extends in the up-down direction;
A second vertical wall that is arranged to surround the first vertical wall, and that constitutes an introduction chamber extending vertically with the first vertical wall,
At the lower end of the first vertical wall, a communication part that connects the heating chamber and the introduction chamber is formed,
Supply of hot water to the sub hot water chamber,
Of the hot and cold water stored in the main hot water chamber , the upper layer of hot water overflows the upper end of the second vertical wall, flows into the introduction chamber, and flows down the introduction chamber from above. 3. The hot water supply system according to claim 1, wherein the hot water supply system is performed by flowing into the heating chamber via the heating chamber. The controller controls the operation of a water supply control valve to adjust the amount of water supplied to the tank body to be in a range from a lower limit water level to an upper limit water level of the tank body,
The upper end of the second vertical wall is set lower than the lower limit water level,
The hot water supply system according to claim 3.

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