JP2019052800A - Hot water storage tank and hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage tank and a hot water supply system capable of stably supplying hot water. SOLUTION: The hot water storage tank 3 is provided by partitioning the inside of the tank main body 30 for storing hot water, and the hot water in the high temperature region of the hot water stored in the tank main body 30 is made to flow into the hot water. The sub hot water chamber Rs for storing, the sub heat exchanger 36 provided in the sub hot water chamber Rs for heating the hot water stored in the sub hot water chamber Rs, and the hot water supply pipe 60 for supplying hot water to the hot water destination can be connected. And a sub hot water supply section 45 for introducing the hot water stored in the sub hot water supply chamber Rs into the hot water supply pipe 60. [Selection diagram] Figure 1

Description

  The present invention relates to a hot water storage tank and a hot water supply system.

  Conventionally, hot water supply systems using renewable energy such as solar heat have been known, and for example, use in school and corporate dormitories, hotels, and nursing homes has been proposed. The hot water supply system includes a solar heat collection system that collects solar heat, and a hot water 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 storage tank when the temperature of the hot water in the hot water storage 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 hot water supply heat exchanger, a hot water storage tank, and an auxiliary boiler. According to this patent document 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 storage tank via the hot water supply heat exchanger. . Moreover, when heating is insufficient, an auxiliary boiler is operated and the hot water in a hot water 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 time of hot water use are within the design range, the necessary thermal energy is secured in the hot water stored in the hot water tank. There will be no shortage of hot water supply. However, when the amount of collected heat is insufficient, the amount of hot water used is excessive, or the hot water is used at irregular times, the temperature of the hot water in the hot water tank is lowered, and there is a problem that the hot water cannot be supplied. .

  This invention is made | formed in view of this situation, The objective is to provide the hot water storage tank and hot water supply system which can perform hot water supply stably.

  In order to solve such a problem, a hot water storage tank according to the first invention is provided by partitioning a tank main body and a tank main body for storing hot water, and hot water in a high temperature region among hot water stored in the tank main body. A sub hot water chamber that stores the hot water by flowing in, a sub hot water chamber, a heating section that heats the hot water stored in the sub hot water chamber, and a hot water supply pipe that supplies hot water to the hot water supply destination are connectable, A first hot water supply section for introducing hot water stored in the sub hot water chamber into the hot water supply pipe.

  Here, 1st invention is comprised so that the water supply piping which supplies water can be connected, and the water supply introduction part which introduces the water supplied from water supply piping in a tank main body, and hot water supply piping are comprised so that connection is possible. And a second hot water supply unit that introduces hot water stored in the tank body into the hot water supply pipe. In this case, the water supply introduction part is provided below the inside of the tank body and includes a diffuser pipe that blows off the water supply in a decelerated state and a dispersed state, and the second hot water supply part is arranged above the inside of the tank body, It is preferable to provide a diffuser pipe that sucks in hot and cold water in a decelerated state and a dispersed state.

  In the first invention, the sub hot water chamber is preferably formed by a partition wall provided in the tank body and partitioning the tank body. In this case, the partition wall is disposed so as to surround the heating unit, and is disposed so as to surround the first vertical wall that constitutes the heating chamber extending in the vertical direction, and between the first vertical wall. And a second vertical wall that constitutes an introduction chamber extending in the vertical direction, and a communication portion that communicates the heating chamber and the introduction chamber is preferably provided at the lower end of the first vertical wall. . And the hot water supply to the sub hot water chamber is such that the hot water of the upper layer out of the hot water stored in the tank body overflows the upper end of the second vertical wall and flows into the introduction chamber, and the introduction chamber is moved downward from above. After flowing, it is preferably performed by flowing into the heating chamber through the communication portion.

  A hot water supply system according to the second invention includes a hot water storage tank according to the first invention, a solar heat collector that heats the heat medium by solar heat, and a heat storage tank that stores the heat medium heated by the solar heat collector. And a heat exchanger for exchanging heat between the heat medium stored in the heat storage tank and the hot water stored in the tank body.

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

The figure which shows typically the structure of the hot water supply system which concerns on this embodiment. Plan view schematically showing the structure of the hot water tank The figure which shows typically the cross section of the hot water storage tank in alignment with the AA line of FIG. The figure which shows typically the cross section of the hot water storage tank in alignment with the BB line of FIG. The top view which shows typically the structure of a hot water tank in a modification The figure which shows typically the cross section of the hot water storage tank in alignment with the AA line of FIG. The figure which shows typically the cross section of the hot water storage tank in alignment with 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 showing the configuration of the 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 the 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 at a hot water supply destination. The hot water supply system 1 is mainly composed of a solar heat collection system 2, a hot water tank 3, a hot water outlet 6 and a controller 8.

  The solar heat collection system 2 is a system that collects solar heat and stores the collected solar heat. The solar heat collection system 2 is mainly composed of 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 the 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 that connect between the solar heat collector 20 and the heat storage tank 23, and the heat medium flows through the pipes. 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 extends from the heat storage tank 23 to the solar heat collector 20. This is a pipe through which the heat medium flows. The heat medium pipe 22 is provided with a heat collection pump 24 serving as a drive source for circulating the heat medium. By driving the heat collection 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 includes 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 the hot water supplied from the hot water tank 3. The heat exchanger 25 heats the hot water supplied from the hot water tank 3 through this heat exchange.

  The heat storage tank 23 is provided with a hot water introduction part 23 a to which one end of the heat exchanger 25 is connected. A hot water pipe 26 through which hot water from the hot water tank 3 flows is connected to the hot water introducing portion 23a. The heat exchanger 25 and the hot water pipe 26 are connected via the hot water introduction part 23a. Moreover, the hot water storage tank 23 is provided with a hot water return section 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 portion 23b. The heat exchanger 25 and the hot water return pipe 27 are connected via the hot water return portion 23b. A hot water pump 28 serving as a driving source for circulating hot water is provided in the hot water pipe 26. By driving the hot water pump 28, hot water is circulated 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 tank 3 stores hot water and supplies the stored hot water. The hot water storage tank 3 includes a water supply introduction part 41, a hot water outlet part 42, a hot water return part 43, a main hot water supply part 44, a sub hot water supply part 45, and a hot water supply return part 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 through the water supply introduction part 41. A first control valve 80 for controlling the water supplied to the hot water storage tank 3 is provided on the path of the water supply pipe 70 leading to the water supply introduction part 41.

  The hot water outlet 42 is connected to a hot water pipe 26 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 piping 26 through the hot water outlet 42.

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

  The main hot water supply part (second hot water supply part) 44 and the sub hot water supply part (first hot water supply part) 45 are connected to a hot water supply pipe 60 described later. Hot water stored in the hot water storage tank 3 flows out to the hot water supply pipe 60 via the main hot water supply section 44 or the 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 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 tank 3. 3 is a diagram schematically showing a cross section of the hot water tank 3 along the line AA in FIG. 2, and FIG. 4 is a diagram schematically showing a cross section of the hot water tank 3 along the line BB in FIG. is there.

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

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

  The partition wall 31 is provided inside the tank body 30. The partition wall 31 defines a sub hot water chamber Rs inside the tank body 30 by partitioning the inside of the tank body 30. The sub hot water chamber Rs is set to a volume smaller than the entire volume of the tank body 30, for example, a volume of about 10% of the entire tank body 30. In order to distinguish the sub hot water chamber Rs from the space in the tank body 30 (a space excluding the sub hot water chamber Rs), the latter space is referred to as a main hot water chamber Rm. That is, the partition wall 31 divides 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 30 d of the tank body 30, that is, a continuous portion of two side surfaces 30 c 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-sectional shape in the horizontal direction and extends along the vertical 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 the two side surfaces 30c forming the corner 30d. The first vertical wall 32 forms a required space (hereinafter referred to as “heating chamber Rs1”) extending in the vertical direction. The heating chamber Rs1 constitutes a part of the sub hot 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 that is a gap is formed between the lower end and the lower surface 30b. The heating chamber Rs1 is communicated with a space outside the first vertical wall 32 through the communication portion 32b. On the other hand, the upper end of the first vertical wall 32 reaches above the upper limit water level L1 of 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 vertical 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 vertical 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 in the vertical direction between the first vertical wall 32 and the first vertical wall 32. The introduction chamber Rs2 constitutes a part of the sub hot water chamber Rs. That is, the sub hot water chamber Rs is constituted by 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 that is lower than the height of the lower limit water level L2 of hot water stored in the tank body 30.

  Of the hot water stored in the main hot water chamber Rm, the upper hot water (hot 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 water flowing into the introduction chamber Rs2 flows from the upper side to the lower side through the introduction chamber Rs2, and then flows into the heating chamber Rs1 through the communication portion 32b provided at the lower end of the first vertical wall 32. Thereby, the upper 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 allowing the hot water in the upper layer out of the hot water stored in the main hot water chamber Rm to flow in and storing the hot water flowing in.

  The main heat exchanger 35 performs heat exchange 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 water stored in the main hot water chamber Rm is heated by the heat of the heat storage tank 23. In addition, it can be heated using steam (boiling with steam). The main heat exchanger 35 is disposed below the main hot water chamber Rm, specifically, at a position close to the lower surface 30b.

  Surplus steam such as a boiler 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 that controls 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 condensed water condensed in the main heat exchanger 35 and a condensed water tank 54 for storing condensed water.

  The sub heat exchanger 36 exchanges heat between the hot water stored in the sub hot water chamber Rs and the 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 a 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 such as a boiler is supplied to the sub steam pipe 52, and in this 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 the 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 chamber Rm is provided with the water supply introduction portion 41, the hot water outlet portion 42, the hot water return portion 43, and the main hot water supply portion 44 described above.

  The water supply introduction part 41 is disposed so as to be adjacent to the lower side of the main hot water chamber Rm, specifically, the upper side of 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 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 body. The plurality of outlets are set on the lower side of the pipe main body so as to blow out water supply toward the main heat exchanger 35.

  The hot water outlet 42 is disposed below the side surface 30 c forming the tank body 30. On the other hand, the hot water return portion 43 is disposed at an upper position on the same side surface 30 c as the hot water outlet portion 42. As described above, the hot water return section 43 is positioned above the hot water outlet section 42.

  The main hot water supply section 44 is disposed at a position 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 water stored in the main hot water chamber Rm in a decelerated state and a dispersed state. For example, the diffuser pipe 44a is composed of 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 on the lower side of the pipe body.

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

  Referring to FIG. 1 again, the hot water outlet 6 is installed in a hot water supply facility and discharges hot water, and corresponds to, for example, a shower in a bathroom in a dormitory. 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 corresponding to the hot water temperature required by the user, and discharges it.

  The hot water supply pipe 60 is a pipe that supplies hot water supplied from the hot water storage tank 3 to the hot water supply port 6 of the hot water supply destination via the main hot water supply section 44 or the sub hot water supply section 45. 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 are joined together to reach the hot water supply port 6. A fourth control valve 83 for switching the hot water path between the main hot water supply unit 44 (main hot water chamber Rm) side and the sub hot water supply unit 45 (sub hot water chamber Rs) side is provided at the junction of the hot water supply pipe 60. . A hot water supply pump 62 that discharges hot water supplied from the hot water storage tank 3 to the hot water supply port 6 side is provided on the downstream side of the fourth control valve 83. Further, a pressure tank 63 is provided downstream of the hot water supply pump 62.

  The hot water supply pipe 60 is connected to a hot water supply return pipe 61 that returns a part of hot water supplied to the hot water supply port 6 to the 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 the hot water.

  The controller 8 is a control unit that controls the hot water supply system 1. Signals from various sensors are input to the controller 8 as control inputs. The controller 8 performs various calculations based on the control input, and outputs a control output according to the calculation result to each part of the 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. The lower limit level sensor 91 detects the lower limit water level L <b> 2 of hot water stored in the hot water 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 so that the hot water stored in the hot water tank 3 is in the 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 tank 3 decreases due to the use of hot water and the water level reaches the lower limit water level L2, and the main hot water chamber Rm. Supply water. When the water level in the main hot water chamber Rm rises due to the water supplied from the water supply pipe 70 and 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. The sub temperature sensor 93 detects the temperature of hot water in the 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, operation | movement of the hot water supply system 1 which concerns on this embodiment is demonstrated according to a specific use condition. First, the hot water supply system 1 is applied to a school and a company dormitory. In the hot water supply system 1 used in the dormitory, the hot water supply is concentrated in the time zone from 6:30 pm to 10:00 pm (hot water use time zone), and most of the hot water is used in this hot water use time zone. There is a tendency to. The operation (heat collection) of the solar heat collection system 2 ends at approximately 3 pm. If the transfer of heat from the heat storage tank 23 to the hot water storage tank 3 is taken into consideration, the start time of using the hot water supply is 6:00 pm. When these are shown in a daily schedule, the heat collection time zone by the solar heat collection 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 tank 3 is from 3:00 pm Until 5 o'clock, boiling of hot water with steam is from 4:30 pm to 6 pm. When the amount of heat collected by solar heat is as designed, the temperature of the hot water stored in the hot water tank 3 reaches the designed hot water supply temperature by 6 pm. Further, when the amount of hot water supply used is as designed, the heat (hot water) stored in the hot water storage tank 3 can be used up without problems in the hot water use time zone.

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

  Therefore, the controller 8 detects the temperature of the hot water in the main hot water chamber Rm by the main temperature sensor 92, for example, at 5:45 pm, a predetermined time before the start time of using the hot water supply. And when this temperature has not reached the design hot water supply temperature, the 4th control valve 83 is controlled and the path | route of the hot water from the hot water storage tank 3 is switched to the sub hot water supply part 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 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 adjusts the supply of steam to the sub heat exchanger 36 by controlling the third control valve 82 so that the temperature of the hot water in the sub hot water chamber Rs maintains the designed hot water supply temperature. Thereby, the stable hot water supply can be performed.

  Moreover, even if the amount of heat (hot water) as designed is present in the hot water storage tank 3 at the start time of hot water supply use, depending on the subsequent hot water use situation, the hot water use amount may exceed the designed hot water use amount. Even within the range of the hot water use time, all the heat (hot water) in the hot water tank 3 may be used up. In this case, since the temperature of the hot water in the hot water storage tank 3 is lowered to the temperature of the water supply, the hot water supply cannot be used even during the designed hot water use time zone. For example, the hot water supply cannot be used even before 10 pm. Similarly, even if the amount of hot water used is as designed, the amount of hot water used reaches the amount of designed hot water used after the designed hot water usage period. In this case, since the temperature of the hot water in the hot water storage tank 3 is lowered to the temperature of the water supply, the hot water supply cannot be used except in the design hot water use time zone. For example, hot water supply 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. 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 section 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 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. And the controller 8 controls the 3rd control valve 82, and adjusts supply of the vapor | steam with respect to the sub heat exchanger 36 so that the temperature of the hot water of sub hot water chamber Rs may maintain design hot water supply temperature. As a result, stable hot water supply can be performed even when the amount of hot water used exceeds the amount of designed hot water used, or even during a time other than the designed hot water usage time zone.

  Thus, according to the structure of the hot water storage tank 3 of this embodiment, the hot water stored in the sub hot water chamber Rs can be individually boiled. Thereby, the hot water for hot water supply is securable. Therefore, even in a case where desired hot water supply cannot be performed 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 stably supplied.

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

  By the way, as a countermeasure to the above-described problem, it is conceivable to raise the boiling time of the hot water tank 3 without providing the sub hot water chamber Rs. However, heat is excessively applied to the hot water tank 3. Therefore, an imbalance occurs between the amount of hot water used and the heat (hot water) stored in the hot water tank 3 cannot be used up completely, and this heat is carried over to the next day. In this case, a 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 respect, 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. For this reason, since the heat in the hot water tank 3 is hardly carried over to the next day, the utilization rate of solar heat can be increased.

  Moreover, in this embodiment, introduction of the water supply in the main hot water chamber Rm is performed through the water supply introduction part 41 with the diffuser pipe | tube 41a arrange | positioned in the lower part in the main hot water chamber Rm. Moreover, the outflow of the hot water from the main hot water chamber Rm is performed via the main hot water supply part 44 with the diffuser pipe | tube 41a arrange | positioned in the upper part in the main hot water chamber Rm. Thereby, the water supplied from the water supply introduction part 41 is slowly introduced into the main hot water chamber Rm in the entire region in the horizontal direction. Similarly, hot water flowing out from the main hot water chamber Rm is slowly sucked into the main hot water supply section 44 in the entire horizontal direction. Therefore, a flow (piston flow) that is pushed upward from the lower side is formed in the main hot water chamber Rm with the overall movement of the hot water due to the introduction of the water supply and the outflow of the hot water. Due to this flow, the high-temperature hot water present in the main hot water supply section 44 is not stirred, and a temperature distribution from low temperature to high temperature is formed in order from below to above. As a result, the upper hot water, that is, the hot water in the high temperature region out of the hot water stored in the main hot water chamber Rm flows into the sub hot water chamber Rs. In particular, the hot water in the high temperature region corresponds to relatively hot water that cannot be boiled up by the main heat exchanger 35. Therefore, in the sub hot water chamber Rs, only the shortage of the temperature that has not been raised by the main heat exchanger 35 needs to be boiled. Thereby, boiling can be efficiently performed in the sub heat exchanger 36.

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

  In the present embodiment, the sub hot water chamber Rs is formed by the partition wall 31 including the first vertical wall 32 and the second vertical wall 33. The hot water supply to the sub hot water chamber Rs is such that the hot water of the upper layer out 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 the upper side to the lower side, this is performed by flowing into the heating chamber Rs1 through the communication portion 32b.

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

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

  Further, the sub hot water chamber Rs may have any structure as long as hot water stored in the main hot water chamber Rm is allowed to flow in to store hot water. Here, FIG. 5 is a plan view schematically showing the configuration of the hot water tank 3 according to the modification. 6 is a diagram schematically showing a cross section of the hot water tank 3 taken along the line AA of FIG. 5, and FIG. 7 is a diagram schematically showing a cross section of the hot water tank 3 taken along the line BB of FIG. is there.

  In the hot water storage tank 3 according to this modification, the structure for dividing the sub hot water chamber Rs is different, and an internal tank 37 is provided instead of the partition wall 31. The internal 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 the lower side of the peripheral side wall 38. That is, the sub hot water chamber Rs is configured by dividing the inside of the tank 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 interior of the tank body 30 and is disposed in an area where hot water of the upper layer exists in the hot water stored in the tank body 30. The peripheral side wall 38 constituting the internal tank 37 has a lower end at a position lower than the lower limit water level L2 of the hot water stored in the tank body 30, while an upper limit upper water level L1 of the hot water stored in the tank body 30. Exist in a higher position.

  A plurality of small holes are formed in the peripheral side wall 38 and the bottom plate 39, and hot water in the upper layer of the tank body 30 flows into the internal tank 37 through these small holes. And the sub heat exchanger 36 is arrange | positioned inside the internal tank 37, The hot water which flowed into the inside of the internal tank 37 can be heated with the sub heat exchanger 36.

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

  As mentioned above, although the hot water storage tank and hot water supply system which concern on this embodiment were demonstrated, it cannot be overemphasized that a various change is possible in the range of the invention, without this invention being limited to this embodiment.

  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.

DESCRIPTION OF SYMBOLS 1 Hot water supply system 2 Solar thermal collection system 20 Solar thermal collector 23 Thermal storage tank 25 Heat exchanger 3 Hot water storage tank 30 Tank main body 31 Bulkhead 32 First vertical wall 32a End side 32b Communication part 33 Second vertical wall 33a End side 35 Main heat Exchanger 36 Sub heat exchanger (heating unit)
37 inner tank 38 peripheral side wall 39 bottom plate 41 water supply introduction part 41a diffuser pipe 42 hot water outlet part 43 hot water return part 44 main hot water supply part (second hot water supply part)
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 room RS Sub hot water room Rs1 Heating room Rs2 Introduction room

Claims (4)

A tank body for storing hot water,
A sub hot water chamber that is provided by partitioning the inside of the tank body, stores hot water by flowing hot water in a high temperature region out of hot water stored in the tank body, and
A heating unit that is provided in the sub hot water chamber and heats the hot water stored in the sub hot water chamber;
A hot water supply pipe for supplying hot water to a hot water supply destination is configured to be connectable, and a first hot water supply section for introducing hot water stored in the sub hot water chamber into the hot water supply pipe,
A hot water tank. A water supply pipe for supplying water is configured to be connectable, and a water supply introduction section for introducing water supplied from the water supply pipe into the tank body;
The hot water supply pipe is configured to be connectable, and further has a second hot water supply section for introducing hot water stored in the tank body into the hot water supply pipe,
The water supply introduction portion includes a diffuser pipe that is disposed below the tank body and blows out water in a decelerated state and a dispersed state.
2. The hot water storage tank according to claim 1, wherein the second hot water supply section includes a diffuser pipe that is disposed above the tank main body and sucks hot water in the tank main body in a decelerated state and a dispersed state. The sub hot water chamber is formed by a partition wall provided in the tank body and dividing the tank body,
The partition is
A first vertical wall arranged to surround the heating unit and constituting a heating chamber extending in the vertical direction;
A second vertical wall that is disposed so as to surround the first vertical wall and that constitutes an introduction chamber extending in the vertical direction between the first vertical wall and
A communication portion that connects the heating chamber and the introduction chamber is formed at the lower end of the first vertical wall,
Supply of hot water to the sub hot water chamber is as follows:
Of the hot water stored in the tank body, the hot water of the upper layer overflows the upper end of the second vertical wall and flows into the introduction chamber. After flowing through the introduction chamber from below, The hot water storage tank according to claim 1 or 2, wherein the hot water tank is performed by flowing into the heating chamber. A hot water tank according to any one of claims 1 to 3,
A solar collector that heats the heating medium by solar heat;
A heat storage tank for storing a heat medium heated by the solar heat collector;
A heat exchanger for exchanging heat between the heat medium stored in the heat storage tank and the hot water stored in the tank body;
Having a hot water system.

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