JP2016136077A - Hot water storage tank and hot water storage unit using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage tank capable of curbing disturbance in temperature stratification and to provide a hot water storage unit using the hot water storage tank.SOLUTION: A hot water storage tank 40 has a diaphragm 81 which is arranged at a distance G from an inner face of at least a portion of a sidewall 40A in the hot water storage tank 40 and separates an interior of the hot water storage tank into a peripheral sidewall space and a central space. The diaphragm 81 arranged at the distance G from the inner face prevents cold water from being circulated into the central space in the hot water storage tank 40 even when a convection flow is generated on the inner face thereof. Thus, the hot water storage tank 40 reduces a quantity of water circulated into the central space of the hot water storage tank 40 and curbs disturbance in temperature stratification of the water stored therein.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a hot water storage tank and a hot water storage unit using the hot water storage tank, and is suitable for improving heat exchange efficiency using water stored in the hot water storage tank.

  For example, Patent Document 1 has been proposed as a system for supplying water from a hot water storage tank to a heating element such as a fuel cell and collecting water warmed by the heat of the heating element in the hot water storage tank. In the system of Patent Document 1, a three-way valve is provided in a pipe that supplies cold water from a hot water storage tank to a heating element, and a path that branches from the three-way valve and returns to the pipe through a radiator is provided. This path is used when the cold water out of the hot water and cold water stored in the hot water storage tank disappears and the hot water storage tank is filled with the hot water, and the hot water is cooled by the radiator.

  The system of Patent Document 1 must secure a radiator for cooling the hot water storage tank and a path for supplying the hot water of the hot water storage tank to the heat radiator, and an area where cold water should be secured in the hot water storage tank. Although the heat insulating material is omitted, it tends to increase in size. Since the heat insulating material in the area where cold water should be secured is omitted, if hot water enters this omitted part, the hot water that has entered will be cooled down to a temperature lower than the hot water and higher than the cold water. When further cooled, it becomes cold water. However, since a boundary layer having a temperature lower than that of the hot water and higher than that of the cold water is formed between the hot water layer of the hot water stored in the hot water storage tank and the cold water layer of the cold water, the heat insulation material is omitted. However, even if hot water is cooled, it does not become cold water but merges with the boundary layer, so that the boundary layer becomes thicker or the temperature stratification of the hot water storage tank tends to collapse.

  For example, Patent Document 2 has been proposed by the present applicant as a hot water storage unit that can omit the radiator of the system of Patent Document 1. In the hot water storage unit of Patent Document 2, a case for storing the hot water storage tank is provided with a gap from the hot water storage tank, and passes from the air supply port of the case between the hot water storage tank and the case to the exhaust port of the case. The hot water storage tank is cooled by the airflow.

JP2013-249972A Japanese Patent Application No. 2013-209494

  However, in Patent Document 2, since the outer surface of the hot water storage tank is cooled by the flow of air, convection occurs on the inner surface of the hot water storage tank, and the chilled water tends to flow around the center. When the cold water goes around the center, the boundary layer between the hot water layer and the cold water layer stored in the hot water storage tank tends to be thick, or the temperature stratification of the hot water storage tank tends to collapse.

  Therefore, an object of the present invention is to propose a hot water storage tank and a hot water storage unit using the hot water storage tank which can reduce the boundary layer of the hot water storage tank from becoming thicker or the temperature stratification from collapsing.

  In order to solve such a problem, the hot water storage tank of the present invention is provided with a partition plate that is disposed with a clearance from the inner surface of at least a part of the side wall of the hot water storage tank, and partitions the side wall side and the central side of the hot water storage tank.

  The hot water storage unit of the present invention includes a hot water storage tank, a partition plate that is disposed with a clearance from an inner surface of at least a part of the side wall of the hot water storage tank, and partitions the side wall side and the central side of the hot water storage tank, and the hot water storage device. A circulation pump that supplies water from the tank to the heating element and supplies water heated by the heating element to the hot water storage tank.

  In the present invention, even if convection occurs on the inner surface of the hot water storage tank, the partition plate arranged with a gap from the inner surface prevents cold water from flowing into the center of the hot water storage tank. For this reason, the amount of water flowing into the center of the hot water storage tank is reduced, and the temperature stratification of the stored water stored in the central side of the hot water storage tank is prevented from collapsing, and is generally maintained. Therefore, compared with the case where the temperature stratification of the whole stored water stored in the hot water storage tank collapses due to the absence of the partition plate, the collapse of the temperature stratification is reduced. In this way, a hot water storage tank and a hot water storage unit using the hot water storage tank that can reduce the collapse of temperature stratification are realized.

It is a figure showing the hot-water supply system of this embodiment. It is a figure which shows the adjustment mechanism in a hot water storage unit. It is a figure which shows the cross section of the direction orthogonal to the longitudinal direction of a hot water storage tank. It is a figure which shows the one part mode of a partition plate. It is a figure which shows typically the mode (1) of a transition of a boundary layer. It is a figure which shows typically the mode (2) of a transition of a boundary layer. It is a figure which shows typically the mode (3) of a transition of a boundary layer. It is a figure which shows typically the mode (4) of a transition of a boundary layer. It is a figure which shows a part of hot water storage unit in 2nd Embodiment. It is a figure which shows the hot water storage tank in 2nd Embodiment from the same viewpoint as FIG. It is a figure which shows the hot water storage tank in 3rd Embodiment from the same viewpoint as FIG. It is a figure which shows the hot water storage tank in 4th Embodiment from the same viewpoint as FIG. It is a figure where it uses for description of the formation method of a partition plate. It is a figure which illustrates another hot-water supply system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1) 1st Embodiment As shown in FIG. 1, the hot water supply system 1 of this embodiment is equipped with the heat generating body 10, the hot water storage unit 20, and the heat radiator 30 as main components.

  The heating element 10 is a source for generating heat, and is a fuel cell in the present embodiment. Examples of the fuel cell include a solid oxide fuel cell (SOFC), a polymer electrolyte fuel cell (PEFC), and a phosphoric acid fuel cell (PAFC). ), Molten carbonate fuel cell (MCFC). Instead of the fuel cell, an engine such as a power generation gas turbine engine, a power generation gas engine, or a power generation diesel engine may be applied, or a solar panel may be applied.

  The hot water storage unit 20 includes a hot water storage tank 40 and a heat source device 50. The hot water storage tank 40 is a tank having a storage capacity of 70 liters, for example. The lower part of the hot water storage tank 40 and the heating element 10 are connected by a pipe 41, the upper part of the hot water storage tank 40 and the heating element 10 are connected by a pipe 42, and a circulation pump 43 is provided at a predetermined part of the pipe 41.

  The circulation pump 43 sends the cold water stored in the hot water storage tank 40 from the lower part of the hot water storage tank 40 to the heating element 10 via the pipe 41, and warm water heated by the heat generated by the heating element 10 via the pipe 42. It is supplied to the upper part of the hot water storage tank 40.

  A hot water supply pipe 61 is connected to the lower part of the hot water storage tank 40, and a hot water discharge pipe 62 is connected to the upper part of the hot water storage tank 40, and the hot water supply pressure from the water supply pipe 61 is applied to the hot water storage tank 40. For this reason, the hot water storage unit 20 uses the hot water stored in the upper part of the hot water storage tank 40 to supply hot water stored in the hot water storage tank 40 by the supply water pressure when the faucet (not shown) connected to the downstream side of the hot water discharge pipe 62 is opened. It is possible to send out from 62 to the downstream side.

  Thus, in the hot water storage unit 20, a circulation circuit is formed from the lower part of the hot water storage tank 40 to the upper part of the hot water storage tank 40 via the heating element 10, and hot water heated by the heating element 10 is discharged from the upper part of the hot water storage tank 40. When being sent out to the pipe 62, cold water is supplied from the water supply pipe 61 to the lower part of the hot water storage tank 40.

  The hot water storage unit 20 of the present embodiment is provided with an adjustment mechanism for adjusting the temperature stratification of the stored water stored in the hot water storage tank 40. The adjustment mechanism will be described later.

  The heat source device 50 includes burners 51A and 51B that burn combustion gas, a gas adjustment unit 52 that adjusts the amount of combustion gas to be supplied to the burners 51A and 51B, and a combustion fan 53 that sends air into the burners 51A and 51B. . The heat source device 50 includes sensible heat exchangers 54A and 54B and latent heat exchangers 55A and 55B.

  The sensible heat exchangers 54A and 54B are provided above the burners 51A and 51B, and mainly recover sensible heat from the air heated by the burners 51A and 51B to heat the heat medium. The latent heat exchangers 55A and 55B are provided on the downstream side of the sensible heat exchangers 54A and 54B in the flow path of the air flowing from the burners 51A and 51B, and are heated by the sensible heat exchangers 54A and 54B. The latent heat of the generated exhaust gas is mainly recovered to heat the heat medium.

  The burner 51A, the sensible heat exchanger 54A, and the latent heat exchanger 55A are stored in the first combustion chamber 56A, and the burner 51B, the sensible heat exchanger 54B, and the latent heat exchanger 55B are stored in the second combustion chamber 56B. . An exhaust pipe 57 communicates with the upper part of the first combustion chamber 56 </ b> A and the upper part of the second combustion chamber 56 </ b> B, and a drain recovery port 58 is provided at the bottom near the outlet of the exhaust pipe 57.

  Below the latent heat exchangers 55A and 55B, trays 59A and 59B for receiving and recovering condensed water resulting from recovering the latent heat of the exhaust gas generated by heating in the sensible heat exchangers 54A and 54B. Is provided. The condensed water collected from the trays 59A and 59B and the drain collection port 58 is supplied to the neutralizer 60 through the guide tube, neutralized by the neutralizer 60, and discharged to the outside of the hot water storage unit 20.

  In such a heat source device 50, a hot water supply circuit for supplying hot water heated by the sensible heat exchanger 54A and the latent heat exchanger 55A to the outside is formed. That is, a water supply pipe 61 is connected to the lower part of the hot water storage tank 40. Moreover, one end of a hot water discharge pipe 62 is connected to the upper part of the hot water storage tank 40, and the other end of the hot water discharge pipe 62 is connected to an input port of the latent heat exchanger 55A. The output port of the latent heat exchanger 55A is connected to the input port of the sensible heat exchanger 54A through a guide tube, and the output port of the sensible heat exchanger 54A is connected to the hot water pipe 63.

  A predetermined part of the water supply pipe 61 is provided with a water flow sensor 64 for measuring the water flow of the water in the water supply pipe 61, a water quantity servo 65 for adjusting the water quantity of the water, and the like. Moreover, the predetermined part in the middle of the hot water pipe 62 and the predetermined part in the middle of the hot water pipe 63 are connected by a bypass pipe 66 for bypassing the sensible heat exchanger 54A and the latent heat exchanger 55A. A bypass servo 67 that adjusts the amount of water to be diverted from the hot water discharge pipe 62 to the hot water discharge pipe 63 is provided at a connection portion between the bypass pipe 66 and the hot water discharge pipe 62.

  Water supplied from the water supply pipe 61 flows out from a faucet or the like via a hot water supply circuit that sequentially passes through the hot water storage tank 40, the hot water discharge pipe 62, the latent heat exchanger 55A, the sensible heat exchanger 54A, and the hot water discharge pipe 63. .

  Further, in the heat source device 50, a circulation circuit that circulates through the sensible heat exchanger 54B and the latent heat exchanger 55B and the external radiator 30 is formed. That is, one end of the return pipe 71 is connected to the output port of the radiator 30, and the other end of the return pipe 71 is connected to the input port of the latent heat exchanger 55B. The output port of the latent heat exchanger 55B is connected to the input port of the sensible heat exchanger 54A through the guide tube, and the output port of the sensible heat exchanger 54B is connected to the input port of the radiator via the forward piping 72. Is done. A circulation pump 73 for circulating the circulation circuit is provided at a predetermined portion of the return pipe 71.

  The circulation pump 73 sends the heat medium heated by the sensible heat exchanger 54B and the latent heat exchanger 55B to the radiator 30 via the forward pipe 72, and sends the heat medium exiting from the radiator 30 via the return pipe 71. It returns to the latent heat exchanger 55B. Note that the heat medium is water in this embodiment.

  Next, an adjustment mechanism for adjusting the temperature stratification of the stored water stored in the hot water storage tank 40 in the hot water storage unit 20 will be described.

  As shown in FIG. 2, the hot water storage unit 20 includes a partition plate 81, a temperature sensor 82, a heat insulating member 83, a fan 84, and a controller 85 in addition to the above configuration. In addition, about the hot water storage tank 40, the partition plate 81, and the heat insulation member 83, the cross section of the direction along the side wall 40A of the said hot water storage tank 40 is shown for convenience. The heat insulation member 83 has a feature (difference from Patent Document 1) that is not an internal heat insulation method (an internal heat insulation method or a filling heat insulation method in a building) in which a heat insulating material is directly wound around the hot water storage tank 40 that is a heat retaining object. It is in the point that it is the method (outside heat insulation construction method in building, outside heat insulation construction method).

  As shown in FIGS. 2 and 3, the partition plate 81 partitions the side wall side and the center side of the hot water storage tank 40, and is arranged to face the inner surface of a part of the side wall 40 </ b> A in the hot water storage tank 40. The

  The thickness of the partition plate 81 is smaller than the thickness of the side wall 40A of the hot water storage tank 40, and the partition plate 81 and the side wall 40A of the hot water storage tank 40 are made of the same material. Moreover, the shape of the partition plate 81 is cylindrical in this embodiment.

  Such a partition plate 81 includes a separation part PT1 arranged with a gap G and an inner surface of the side wall 40A of the hot water storage tank 40, and a plurality of contact parts PT2 arranged in contact with the inner surface of the side wall 40A. Have In the case of the present embodiment, the gap G between the separation site PT1 and the side wall 40A is approximately the same at any position, and is smaller than the distance D between the directly facing positions in the separation site PT1.

  In the case of the present embodiment, a plurality of openings OP are formed in the separation part PT1, and the total area of the openings OP is made smaller than the surface area of the surface facing the side wall 40A of the hot water storage tank 40 in the separation part PT1. The Moreover, a part of area | region which had in each opening OP of separation part PT1 in this embodiment is made into contact part PT2.

  For example, as shown in FIG. 4, a pair of cut portions 81A that are parallel to the side wall 40A of the hot water storage tank 40 and a cut portion 81B that is orthogonal to the side walls 40A and that is connected to the lower ends of the pair of cut portions 81A are separated from each other. It is formed at site PT1. The region surrounded by the notches 81A and 81B is bent toward the side wall 40A of the hot water storage tank 40 to form a contact part PT2 orthogonal to the side wall 40A and a connection part PT3 parallel to the side wall 40A. The The length L in the direction perpendicular to the side wall 40A of the hot water storage tank 40 at the connection site PT3 coincides with the gap G (FIG. 2) between the side wall 40A of the hot water storage tank 40 and the separation site PT1 of the partition plate 81.

  FIG. 4 is a perspective view of the opening portion of the partition plate 81 as viewed from above the inner wall of the hot water storage tank 40 toward the lower center of the hot water storage tank 40. In FIG. 2, two contact parts PT2 are provided in the upper part of the hot water storage tank 40, two are provided in the middle part, and two are provided in the lower part. However, the number of the contact parts PT2 is seven or more. Or five or less. Moreover, although the two contact parts PT2 provided in the upper part, middle part, or lower part of the hot water storage tank 40 face each other, they may not face each other. Furthermore, although the contact part PT2 of the upper part, middle part, and lower part of the hot water storage tank 40 is arrange | positioned on a straight line, it does not need to be arrange | positioned on the said straight line. In short, it is only necessary that a plurality of contact portions PT2 are provided from the upper part to the lower part of the hot water storage tank 40.

  The temperature sensors 82 are for measuring the temperature of the stored water stored in the hot water storage tank 40, and are respectively disposed on the outer surface of the side wall 40A at each contact portion PT2 of the partition plate 81 as shown in FIG. The As the temperature sensor 82, for example, a thermistor is applied.

  The heat insulating member 83 surrounds the hot water storage tank 40 with a space from the outer surface of the hot water storage tank 40. Pipes 41, 42, 61, 62 are inserted into the heat insulating member 83, and the space between the heat insulating member 83 and the pipes 41, 42, 61, 62 is sealed. Further, the heat insulating member 83 is formed with an air supply port OP1 for introducing gas into the heat insulating member 83 and an exhaust port OP2 for discharging gas inside the heat insulating member 83.

  The fan 84 sends out air interposed between the hot water storage tank 40 and the heat insulating member 83 to the outside of the heat insulating member 83, and is provided at the exhaust port OP <b> 2 of the heat insulating member 83. A space between the fan 84 and the heat insulating member 83 is sealed. On the outer surface side of the fan 84, there is a shutter 84A that opens the air passage inside and outside the fan 84 according to the driving of the fan 84 and blocks the air passage inside and outside the fan 84 when the fan 84 stops. Provided.

  When gas flows in from the air supply port OP1, the hot water storage tank 40 is cooled by flowing between the heat insulating member 83 and the hot water storage tank 40, and the gas heated by heat exchange with the hot water storage tank 40 is It is sent out to the outside of the heat insulating member 83 through the fan 84.

  The controller 85 is connected to the circulation pump 43, the water flow sensor 64, the water amount servo 65, the plurality of temperature sensors 82, and a remote controller (not shown) via a cable. The controller 85 drives the circulation pump 43 when receiving a command to start cooling the heating element 10 from a remote controller, and when receiving a command to end cooling of the heating element 10 from the remote controller. Stops the circulation pump 43.

  Further, the controller 85 detects the presence or absence of a water flow in the water supply pipe 61 based on the signal output from the water flow sensor 64. Here, when a water flow in the water supply pipe 61 is detected, this means that a water tap (not shown) connected to the downstream side of the hot water discharge pipe 62 is opened, and hot water stored in the upper side of the hot water storage tank 40 is stored. Means that the hot water is fed downstream from the hot water pipe 62. In this case, the controller 85 controls the water amount servo 65 until it is detected that there is no water flow in the water supply pipe 61, and supplies the water in the water supply pipe 61 to the hot water storage tank 40.

  Furthermore, the controller 85 estimates the position of the boundary layer formed at the boundary between the hot water and the cold water stored in the hot water storage tank 40 based on the signals output from the plurality of temperature sensors 82, and with respect to the positions. Compare with the set lower limit. Note that the boundary layer has a temperature lower than the temperature of hot water and higher than the temperature of cold water. In the present embodiment, the height of the boundary layer in the hot water storage tank 40 is estimated as the position of the boundary layer, and the height of cold water to be secured in the hot water storage tank 40 is set as the lower limit value.

  Here, when the height of the boundary layer is lower than the height of the cold water to be secured in the hot water storage tank 40, this means that the hot water to be used for hot water supply secures the cold water by driving the heating element 10 over a long period of time. It means that you have reached the power area. That is, as shown in FIG. 5, among the hot water layer L10 of hot water stored on the upper side of the hot water storage tank 40, the cold water layer L20 of cold water stored on the lower side, and the boundary layer L30 between these layers, The hot water layer L10 has shifted to the lower part of the hot water storage tank 40, and the amount of cooling water for the heating element 10 is becoming insufficient. Whether or not the boundary layer height is lower than the cold water level to be ensured in the hot water storage tank 40 is determined by the temperature sensor 82 provided at the lower part of the hot water storage tank 40 between the partition plate 81 and the hot water storage tank 40. It is estimated based on the signal which detected the cold water layer L2 or the warm water layer L1.

  In this case, the controller 85 drives the fan 84 until the height of the boundary layer L30 estimated based on the signals output from the plurality of temperature sensors 82 changes to a predetermined position in the height direction of the hot water storage tank 40. To do. As a result, the hot water storage tank 40 is cooled by an airflow that flows into the heat insulating member 83 from the air supply port OP1 and passes between the heat insulating member 83 and the hot water storage tank 40 and flows out of the heat insulating member 83 from the fan 84. The

  That is, as shown in FIG. 6, when the outer surface of the hot water storage tank 40 is cooled by the airflow passing between the heat insulating member 83 and the hot water storage tank 40, convection occurs between the partition plate 81 and the hot water storage tank 40. . When convection occurs, the boundary layer L3 at the boundary between the hot water layer L1 and the cold water layer L2 between the partition plate 81 and the hot water storage tank 40 is in accordance with the distance from the inner surface of the hot water storage tank 40. As it moves from the upper part to the lower part, the hot water storage tank 40 is formed so as to be closer to the center. A part of the boundary layer L3 is cooled below the hot water storage tank 40 when it goes around the lower end of the partition plate 81 to become the cold water layer L2, so that the amount of the boundary layer L3 joining the boundary layer L30 is small, and the partition Since the boundary layer L3 that wraps around the lower end of the plate 81 rises along the partition plate 81, the temperature stratification is not broken without mixing with the cold water layer L20. After that, as shown in FIG. 7, the boundary layers L3 and L30 in the hot water storage tank 40 are moved upward. When it is estimated that the height of the boundary layer L30 has reached a predetermined position, for example, when the temperature sensor 82 provided at the center of the hot water storage tank 40 detects the cold water layer L2, as shown in FIG. 84 is stopped. When the fan 84 is stopped, the boundary layer L3 shown in FIG. 8 changes from the oblique state to the horizontal state in the same manner as the boundary layer L30, and the boundary layer L30 shown in FIG. .

  In addition, when the lower end of the partition plate 81 is below the height of the cold water to be secured in the hot water storage tank 40, a part of the partition plate 81 is present in the area where the cold water is to be secured. In this case, the boundary layer L3 is lower than the case where the lower end of the partition plate 81 is equal to or higher than the cold water level to be secured in the hot water storage tank 40 and the partition plate 81 does not exist in the area where the cold water should be secured. Becomes difficult to flow around the lower end of the partition plate 81 and flow into the center side (cooling further proceeds). Therefore, when the lower end of the partition plate 81 is below the height of the cold water to be secured in the hot water storage tank 40, the thickness of the cold water layer L20 can be increased without increasing the thickness of the boundary layer L30. In other words, since the hot water layer L1 is cooled to form the boundary layer L3, the boundary layer L3 is further cooled to form the cold water layer L2, and then merged with the cold water layer L20, so that the thickness of the boundary layer L30 does not increase. .

  As described above, in the hot water storage unit 20 in the present embodiment, the partition plate 81 that partitions the side wall side and the center side of the hot water storage tank 40 is separated from the inner surface of at least a part of the side wall 40A in the hot water storage tank 40 by the gap G. Be placed.

  For this reason, as shown in FIGS. 6 to 8, the cold water between the partition plate 81 and the hot water storage tank 40 quickly moves to the lower part without going around the center of the hot water storage tank 40. That is, even if convection occurs on the inner surface of the hot water storage tank 40, cold water is prevented from flowing into the center of the hot water storage tank 40.

  Thus, even if the outer surface of the hot water storage tank 40 is cooled, the hot water storage unit 20 can reduce the amount of cold water that circulates to the center of the hot water storage tank 40 by the partition plate 81, and temperature stratification on the center side of the hot water storage tank 40. Can be reduced.

  The temperature stratification on the center side of the hot water storage tank 40 includes a hot water layer L10 having the same temperature as the hot water layer L1 stored in the upper part of the hot water storage tank 40, and a cold water layer L2 stored in the lower part of the hot water storage tank 40. It consists of a cold water layer L20 having substantially the same temperature and a boundary layer L30 having a temperature substantially the same as that of the boundary layer L3 between these layers. When there is no partition plate 81 in the present application, the boundary layer L30 increases the amount of cold water that goes around the center of the hot water storage tank 40 due to cooling of the outer surface of the hot water storage area 40 (hot water layer L10). Also, since it becomes thicker, it is necessary to wind a heat insulating material to prevent cooling of the surface. In addition, the temperature of the boundary layer L30 is approximately intermediate between the temperature of the hot water layer L10 and the temperature of the cold water layer L20. For this reason, as the thickness of the boundary layer L30 increases, the amount of water in the hot water storage tank 40 used for the refrigerant of the heating element 10 or for hot water supply such as a faucet decreases.

  Therefore, the partition plate 81 is used instead of the heat insulating material to prevent the cold water flowing into the center of the hot water storage tank 40 from being cooled by the cooling of the outer surface of the hot water storage tank 40 and the temperature stratification of the stored water stored in the central side of the hot water storage tank 40 from collapsing. The fact that it can be reduced by using is particularly useful from the viewpoint of efficiently using the water stored in the hot water storage tank 40.

  5-8 has illustrated the temperature of the hot water layer L1 as 60 to 80 degreeC, and the temperature of the cold water layer L2 as 10 degreeC. Moreover, FIGS. 5-8 has shown the cross section without the separation site | part PT1 and contact part PT2 in the partition plate 81 for convenience. The distance between the two points of the contact between the hot water layer L1 and the boundary layer L3 on the inner surface of the hot water storage tank 40 and the contact point between the boundary layer L3 and the cold water layer L2 is the same because the temperature layer is formed obliquely during cooling. By contacting the side wall of the hot water storage tank for a long time in the direction, the cold water constituting the cold water layer L2 and the cold water layer L20 can be efficiently made with respect to the volume ratio (= L3 / (L1 + L2 + L3 + L10 + L20 + L30)) of the boundary layer L3.

  By the way, as mentioned above, the partition plate 81 side becomes cold water between the partition plate 81 and the hot water storage tank 40. For this reason, when the temperature sensor 82 is disposed on the outer surface of the side wall portion of the partition plate 81 facing the separation portion PT1, the temperature measured by the temperature sensor 82 is the center of the hot water storage tank 40 to be originally measured. It becomes a different value compared to the temperature.

  On the other hand, in the case of the present embodiment, as shown in FIG. 2, the temperature sensor 82 is disposed on the outer surface of the side wall portion opposed to the contact portion PT <b> 2 in the partition plate 81. Since the cold water between the partition plate 81 and the hot water storage tank 40 moves downward so as to avoid the contact part PT2 in the partition plate 81, the water temperature in the vicinity of the contact part PT2 in the hot water storage tank 40 is the partition plate. It becomes the same level as the water temperature stored in the center side of 81. Therefore, even if there is the partition plate 81, it is possible to suppress deterioration in the estimation accuracy of the controller 85 that estimates the position of the boundary layer L30 between the hot water and the cold water stored in the hot water storage tank 40 based on the temperature sensor 82. Can do.

  Furthermore, in the case of this embodiment, since the connection part PT3 parallel to the direction orthogonal to the side wall 40A of the hot water storage tank 40 is disposed at the upper end of the contact part PT2, the convection is further increased inside the contact part PT2. The wraparound of the cold water due to this will be reduced. Therefore, the measured value of the temperature sensor 82 can be brought close to the temperature at the center of the hot water storage tank 40.

  In the present embodiment, the partition plate 81 and the side wall 40A of the hot water storage tank 40 are made of the same material. For this reason, compared with the case where the partition plate 81 and the side wall 40A of the hot water storage tank 40 are made of different materials, even if the contact portion PT2 of the partition plate 81 is fixed to the side wall 40A by welding, the weld portion Corrosion can be reduced.

(2) Second Embodiment Next, a second embodiment will be described with reference to FIGS. Note that components that are the same as or equivalent to those in the first embodiment are denoted by the same reference symbols unless otherwise described, and redundant descriptions are omitted.

  As shown in FIG.9 and FIG.10, in the hot water supply system 1 of this embodiment, the arrangement | positioning aspect of the partition plate 81 arrange | positioned at the hot water storage tank 40 of the hot water storage unit 20 differs from 1st Embodiment.

  That is, in the first embodiment, the contact part PT2 is formed by cutting from the separation part PT1 in the cylindrical partition plate 81, and the contact part PT2 is fixed to the side wall 40A of the hot water storage tank 40.

  On the other hand, in the present embodiment, a part of the outer surface extending from the upper end to the lower end of the cylindrical partition plate 81 is the contact part PT2, and other than the contact part PT2 is the separation part PT1. This contact part PT2 is brought close to the side wall 40A of the hot water storage tank 40 and fixed to the inner surface of the side wall 40A of the hot water storage tank 40. That is, the contact part PT2 in this embodiment is not cut out from the separation part PT1 of the partition plate 81.

  In addition, since the partition plate 81 in this embodiment is brought close to the side wall 40A of the hot water storage tank 40, the gap G between the side wall 40A and the separation portion PT1 of the partition plate 81 becomes larger as the distance from the contact portion PT2 increases. . Further, the plurality of temperature sensors 82 are provided on the outer surface of the side wall portion of the hot water storage tank 40 facing the contact portion PT <b> 2 of the partition plate 81 with an interval from the upper part to the lower part of the hot water storage tank 40.

  Even in the hot water storage unit 20 in which the partition plate 81 is arranged in the hot water storage tank 40 in this way, the amount of water that goes around the center of the hot water storage tank 40 is reduced as in the case of the first embodiment. It is reduced that the temperature stratification of the stored water stored in the tank collapses.

  Further, as in the case of the first embodiment, since the temperature sensor 82 is disposed on the outer surface of the side wall portion of the hot water storage tank 40 facing the contact portion PT2 of the partition plate 81, the contact in the hot water storage tank 40 is performed. The water temperature in the vicinity of the part PT2 is approximately the same as the water temperature stored on the center side of the partition plate 81. Therefore, as in the case of the first embodiment, even if the partition plate 81 is provided, the controller 85 that estimates the position of the boundary layer L30 between the hot water and the cold water stored in the hot water storage tank 40 based on the temperature sensor 82. It is possible to suppress degradation of the estimation accuracy.

  On the other hand, in the case of this embodiment, unlike the case of the said 1st Embodiment, since it does not cut out from separation part PT1 of the partition plate 81, the partition plate 81 can be obtained simply by that much.

(3) Third Embodiment Next, a third embodiment will be described with reference to FIG. Note that the same or equivalent components as those in the above-described embodiment are denoted by the same reference symbols unless otherwise described, and redundant descriptions are omitted.

  As shown in FIG. 11, in the hot water supply system 1 of this embodiment, the shape and arrangement | positioning aspect of the partition plate 81 arrange | positioned at the hot water storage tank 40 of the hot water storage unit 20 differ from 1st Embodiment.

  That is, in the first embodiment, the contact part PT2 is formed by cutting from the separation part PT1 in the cylindrical partition plate 81, and the contact part PT2 is fixed to the side wall 40A of the hot water storage tank 40.

  On the other hand, in this embodiment, the partition plate 81 is an elliptical cylinder. Further, a part from the upper end to the lower end of the outer surface of the partition plate 81 in the elliptical long axis direction is a contact part PT2, and a part other than the contact part PT2 is a separation part PT1. These contact portions PT2 are fixed to the side wall 40A of the hot water storage tank 40. That is, the contact part PT2 in this embodiment is not cut out from the separation part PT1 of the partition plate 81 as in the second embodiment.

  In addition, since the partition plate 81 in the present embodiment has an elliptical cylindrical shape, the gap G between the side wall 40A of the hot water storage tank 40 and the separation portion PT1 of the partition plate 81 increases as the distance from the contact portion PT2 increases. In addition, as in the second embodiment, the plurality of temperature sensors 82 are provided on the outer surface of the side wall portion of the hot water storage tank 40 facing the contact portion PT2 of the partition plate 81 from the upper part to the lower part of the hot water storage tank 40. Are provided at intervals.

  Even in the hot water storage unit 20 in which the partition plate 81 is arranged in the hot water storage tank 40 in this manner, the amount of water that goes around the center of the hot water storage tank 40 is reduced and stored in the hot water storage tank 40 as in the case of the above embodiment. The collapse of the temperature stratification of the stored water is reduced.

  Moreover, since the temperature sensor 82 is arrange | positioned on the side wall part outer surface of the hot water storage tank 40 which the contact part PT2 in the partition plate 81 opposes similarly to the case of the said embodiment, the contact part in the said hot water storage tank 40 is provided. The water temperature in the vicinity of PT2 is approximately the same as the water temperature stored on the center side of the partition plate 81. Therefore, as in the case of the above embodiment, even if the partition plate 81 is present, the controller 85 estimates the position of the boundary layer L30 between the hot water and the cold water stored in the hot water storage tank 40 based on the temperature sensor 82. It is possible to suppress degradation of accuracy.

  Further, as in the case of the second embodiment, the partition plate 81 can be easily obtained by that amount because it is not cut out from the separation portion PT1 of the partition plate 81.

(4) Fourth Embodiment Next, a fourth embodiment will be described with reference to FIG. Note that the same or equivalent components as those in the above-described embodiment are denoted by the same reference symbols unless otherwise described, and redundant descriptions are omitted.

  As shown in FIG. 12, in the hot water supply system 1 of this embodiment, the shape and arrangement | positioning aspect of the partition plate 81 arrange | positioned at the hot water storage tank 40 of the hot water storage unit 20 differ from 1st Embodiment.

  That is, in the first embodiment, the contact part PT2 is formed by cutting from the separation part PT1 in the cylindrical partition plate 81, and the contact part PT2 is fixed to the side wall 40A of the hot water storage tank 40.

  On the other hand, in this embodiment, the arc-shaped partition plate 81 along the side wall 40A of the hot water storage tank 40 is used. In the partition plate 81, an end portion in a direction corresponding to the height direction of the hot water storage tank 40 is bent outward from the arc to form a protruding portion 91. The tip portion of the protrusion 91 is a contact portion PT2.

  Further, in this partition plate 81, convex portions 92 having a rectangular cross section protruding outward from the arc from the one end positioned on the upper side of the hot water storage tank 40 to the lower end positioned on the lower side of the hot water storage tank 40 are provided at predetermined intervals. Formed. The tip portions of these convex portions 92 are contact portions PT2.

  In such a partition plate 81, between the protrusion 91 and the protrusion 92 and between the protrusions 92 adjacent to each other along the circumferential direction of the hot water storage tank 40 is a separation part PT1, the protrusion 91 and the protrusion The contact portion PT2 of 92 is fixed to the side wall 40A of the hot water storage tank 40 as in the above embodiment. Note that the contact portion PT2 is not cut out from the separation portion PT1 of the partition plate 81 as in the second embodiment and the third embodiment.

  In addition, as a formation method of the partition plate 81 of the present embodiment, for example, as shown in FIG. 13, for a single elastic plate having a thickness smaller than the thickness of the side wall 40 </ b> A of the hot water storage tank 40. The projecting portion 91 and the projecting portion 92 are formed by pressing. Moreover, as an attachment method for attaching such a partition plate 81 to the hot water storage tank 40, the partition plate 81 having the protrusion 91 and the convex portion 92 is inserted into the hot water storage tank 40 in a curved state, and then the protrusion The tip portions of 91 and the convex portion 92 are fixed to the inner wall surface of the hot water storage tank 40 by welding or the like. When the partition plate 81 on which the protruding portion 91 and the convex portion 92 are formed is inserted into the hot water storage tank 40 in a curved state, the partition plate 81 spreads toward the inner wall surface side of the hot water storage tank 40 due to elastic force, and the protruding portion 91 and The tip portion of the protrusion 92 is in close contact with the inner wall surface of the hot water storage tank 40. Therefore, it is difficult for the tip portions of the protrusion 91 and the convex portion 92 to be displaced with respect to the inner wall surface of the hot water storage tank 40, and the front end portion can be easily fixed to the inner wall surface of the hot water storage tank 40.

  Even in the hot water storage unit 20 in which the partition plate 81 is arranged in the hot water storage tank 40 in this manner, the amount of water that goes around the center of the hot water storage tank 40 is reduced and stored in the hot water storage tank 40 as in the case of the above embodiment. The collapse of the temperature stratification of the stored water is reduced.

  In the present embodiment, since the temperature sensor 82 is disposed on the outer surface of the side wall of the hot water storage tank 40 that is not opposed to the partition plate 81, the water temperature in the vicinity of the contact part PT2 in the hot water storage tank 40 is It is about the same as the water temperature stored in the center. Therefore, as in the case of the above embodiment, even if the partition plate 81 is present, the controller 85 estimates the position of the boundary layer L30 between the hot water and the cold water stored in the hot water storage tank 40 based on the temperature sensor 82. It is possible to suppress degradation of accuracy.

  Moreover, since it does not cut out from the separation | spacing site | part PT1 of the partition plate 81 similarly to the case of the said 2nd Embodiment and 3rd Embodiment, the partition plate 81 can be obtained simply by that much.

(5) Modification Although the said embodiment was demonstrated as an example, this invention is not limited to the said embodiment, It can change suitably.

In the above embodiment, the fan 84 that is driven until the boundary layer L30 falls below a height of cold water to be secured in the hot water storage tank 40 until it moves to a predetermined position in the height direction of the hot water storage tank 40 is fed. The air volume was kept constant. However, the air flow rate of the fan 84 may be variable. For example, the amount of air blown by the fan 84 until the lowermost part of the boundary layer L3 between the hot water storage tank 40 and the partition plate 81 becomes higher than the lower end of the partition plate 81 is the lower part of the partition plate 81. It is good to make it smaller than the air volume of the fan 84 after becoming higher. In this way, even when the lower end of the partition plate 81 is positioned above the height of the cold water to be secured in the hot water storage tank 40, the boundary layer L3 goes around the lower end of the partition plate 81. It can suppress flowing into the center side. Therefore, the thickness of the cold water layer L20 can be increased without increasing the thickness of the boundary layer L30, as in the case where the lower end of the partition plate 81 is below the height of the cold water to be secured in the hot water storage tank 40. .
That is, when the air flow rate of the fan 84 is reduced, the angle of the boundary layer L3 formed obliquely becomes shallow. As in the first embodiment, the cooling at the lower end of the hot water storage tank 40 does not reduce the amount of the boundary layer L3 that goes around the lower end of the partition plate 81 and merges with the boundary layer L30. The amount of air flow is increased when the boundary layer L3 that goes around the lower end of the partition plate 81 becomes the cold water layer L2, while reducing the amount of the boundary layer L3 that goes around the lower end of the partition plate 81 by reducing the inclination. Similarly to the above embodiment, the hot water layer L1 is cooled to form the boundary layer L3, and the boundary layer L3 is further cooled to form the cold water layer L2, and then merged with the cold water layer L20.
In addition, in the structure of the partition plate 81 extended to a position below the height of the cold water to be ensured in the hot water storage tank 40 of the above embodiment, by combining the control of the fan 84 of the modified example, the cooling start initial stage In this case, the amount of the boundary layer L3 that wraps around the lower end of the partition plate 81 may be reduced by making the inclination of the boundary layer L3 shallow.

Moreover, in the said embodiment, the temperature sensor 82 is arrange | positioned on the outer surface of the side wall part in which the separation site | part PT1 of the partition plate 81 facing the inner surface of the side wall 40A of the hot water storage tank 40 across the gap G is not arranged. It was. However, the temperature sensor 82 is provided on the outer surface of the side wall part where the separation part PT1 of the partition plate 81 is arranged, and the controller 85 arranges the separation part PT1 based on the signal output from the temperature sensor 82. You may make it estimate the temperature on the outer surface of the side wall part which is not.
In this case, the degree of freedom in which the temperature sensor 82 should be arranged on the outer peripheral surface of the hot water storage tank 40 can be improved. For this reason, even if the temperature sensor 82 is placed on the outer peripheral surface of the side wall 40A in the hot water storage tank 40, the position of the boundary layer L30 between the hot water and the cold water stored in the hot water storage tank 40 based on the temperature sensor 82 is determined. It can be estimated with high accuracy.
As an estimation method of the controller 85, for example, the temperature on the outer surface of the side wall part where the separation part PT1 of the partition plate 81 is arranged and the outer surface of the side wall part where the separation part PT1 is not arranged. There is a method of obtaining the temperature on the outer surface of the side wall part where the separation part PT1 is not arranged using a relational expression showing a correlation with the temperature. As another example, see the table showing the correlation between the temperature on the outer surface of the side wall part where the separation part PT1 of the partition plate 81 is arranged and the temperature on the outer surface of the side wall part where the separation part PT1 is not arranged. In addition, there is a method for obtaining the temperature on the outer surface of the side wall part where the separation part PT1 is not disposed.

  Moreover, in the said 2nd Embodiment-4th Embodiment, although opening OP was not formed in separation part PT1 of the partition plate 81, opening OP may be formed similarly to the said 1st Embodiment.

  The shape and arrangement mode of the partition plate 81 and the arrangement mode of the temperature sensor 82 are not limited to the contents shown in the embodiment or the modification, and are appropriately omitted within the scope that can achieve the object of the invention. , Change, addition of well-known technology, and the like.

  Further, in the above embodiment, one end of the two pipes of the pipe 42 and the hot water pipe 62 is connected to the upper part of the hot water storage tank 40, and one end of the two pipes of the pipe 41 and the water supply pipe 61 is connected to the lower part of the hot water storage tank 40. . However, for example, as shown in FIG. 14, one pipe may be connected to the upper and lower portions of the hot water storage tank 40. In FIG. 14, the water supply pipe 101 having one end connected to the lower part of the hot water storage tank 40 branches in two directions at a predetermined portion, and one end of the branch is connected to the heating element 10 and the branch The other is connected to a water supply pipe (not shown) outside the hot water storage unit 20. Similarly, a hot water discharge pipe 102 having one end connected to the upper portion of the hot water storage tank 40 branches in two directions at a predetermined portion, and one end of the branch is connected to the heating element 10 and the other of the branch is Is connected to the input port of the latent heat exchanger 55A. Only the upper part of the hot water storage tank 40 shown in FIG. 1 may be the hot water discharge pipe 102, and only the lower part of the hot water storage tank 40 may be the water supply pipe 101.

  Moreover, in the said embodiment, although the member was not provided in the outer surface side of the one end site | part by which the partition plate 81 is not provided in the hot water storage tank 40, even if the heat insulation member is provided in the said outer surface side good.

  The present invention may be used in the field of handling domestic or commercial water heaters.

DESCRIPTION OF SYMBOLS 1 ... Hot water supply system 10 ... Heat generator 20 ... Hot water storage unit 30 ... Radiator 40 ..., Hot water storage tank 50 ... Heat source 71 ... Return piping 72 ... Outward piping 73 ... Circulation pump 81 ... Partition Plate 82 ... Temperature sensor 83 ... Insulation member 84 ... Fan 85 ... Controller

Claims (9)

A hot water storage tank, comprising: a partition plate that is disposed with a gap from an inner surface of at least a part of the side wall of the hot water storage tank, and partitions the side wall side and the central side of the hot water storage tank. A temperature sensor for measuring the temperature of water stored in the hot water storage tank;
The hot water storage tank according to claim 1, wherein the temperature sensor is disposed on an outer surface of a side wall portion where the partition plate is not disposed with a gap from an inner surface of the side wall. The partition plate has a separation portion arranged with a gap from the inner surface of the side wall, and a contact portion arranged in contact with the inner surface of the side wall,
The hot water storage tank according to claim 2, wherein the temperature sensor is disposed on an outer surface of the side wall at the contact portion. The hot water storage tank according to any one of claims 1 to 3, wherein the side wall and the partition plate are made of the same material. A hot water storage tank,
A partition plate that is disposed with a gap between an inner surface of at least some of the side walls in the hot water storage tank, and partitions the side wall side and the central side of the hot water storage tank;
A hot water storage unit comprising: a circulation pump that supplies water to the heating element from the hot water storage tank and supplies water heated by the heating element to the hot water storage tank. A temperature sensor disposed on an outer surface of a side wall portion where the partition plate is disposed with a gap from an inner surface of the side wall;
A controller connected to the temperature sensor;
The controller is
6. The hot water storage unit according to claim 5, wherein the temperature of the side wall portion where the partition plate is not disposed is spaced apart from the inner surface of the side wall based on a signal output from the temperature sensor. . A plurality of temperature sensors disposed on the outer surface of the side wall portion where the partition plate is not disposed with a gap from the inner surface of the side wall;
A controller connected to the plurality of temperature sensors;
The controller is
6. The hot water storage unit according to claim 5, wherein the position of a boundary layer between warm water and cold water stored in the hot water storage tank is estimated based on signals output from the plurality of temperature sensors. The said circulation pump supplies water to a heat generating body from the lower part of the said hot water storage tank, and supplies the water warmed by the said heat generating body to the upper part of the said hot water storage tank. The hot water storage unit described in the item. A heat insulating member surrounding the hot water storage tank with an interval from the outer surface of the hot water storage tank;
9. The fan according to claim 5, further comprising a fan that is provided on the heat insulating member and sends out air interposed between the hot water storage tank and the heat insulating member to the outside of the heat insulating member. The hot water storage unit described in 1.

Images