JP2013002700A - Heat exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange system preventing reduction of a heating medium due to evaporation from a cistern tank without making the system a pressurizing system.SOLUTION: After finishing a heat collecting operation of heating water in a hot water storage tank 14 by radiating heat in a pipe 18 for heat exchange, received in a heat collection device 21 by making the heating medium circulate in a circulation path 22 that passes through the solar heat collection device 21, the cistern tank 19 and the pipe 18 for heat exchange in the hot water storage tank 14, on condition that the water temperature around the pipe 18 for heat exchange is lower than the heating medium in the cistern tank 19, the circulation path is switched by a switching valve 25 so as to bypass the heat collection device 21 and to pass through the cistern tank 19 and pipe 18 for heat exchange to make the heating medium circulate, and to cool the heating medium in the cistern tank 19.

Description

  The present invention relates to a heat exchange system in which a liquid heat medium is circulated through a circulation path passing through a heat collecting device, a heat radiating device, and a cistern tank to exchange heat.

  A liquid heat medium such as water is circulated through a circulation path that passes through the heat collector, the heat radiating device, and the cistern tank, and the heat received by the heat medium by the heat collecting device is radiated by the heat radiating device to perform heating or hot water storage. There is a heat exchange system that heats the water in the tank. In such a heat exchanging system, air mixed in the circulation path is removed with a cistern tank opened to the atmosphere, and a predetermined amount of heat medium is stored in the cistern tank so that the heat medium can be evaporated somewhat from the cistern tank. I am doing it.

  However, since the heat medium decreases slightly due to evaporation, for example, it has been necessary to replenish the heat medium once a year or increase the capacity of the cistern. In order to eliminate the labor of replenishment, there has been proposed a water circuit for a heating apparatus that employs a structure such as an automobile radiator to prevent evaporation of a heat medium (see Patent Document 1). In this apparatus, an air separation container having a pressure lid similar to the pressure lid of an automobile radiator is provided in the circulation path of the heat medium, and an auxiliary tank opened to the atmosphere is connected to the outlet side of the pressure lid. When the internal pressure on the circulation path side fluctuates and the heat medium becomes excessive or insufficient, the heat medium is discharged and sucked between the auxiliary tank and the air separation container through the valve of the pressure lid.

Japanese Utility Model Publication No. 58-18105

  When a structure such as a pressure lid of an automobile radiator is adopted, the entire circulation path of the heat medium becomes a pressurizing system. For this reason, pressure resistance is requested | required of piping which comprises the circulation path of a heat carrier, For example, there exists a problem that use of resin-made piping becomes difficult. Further, since the pressure lid and the auxiliary tank are provided, the structure becomes complicated.

  An object of the present invention is to provide a heat exchange system capable of preventing the reduction of a heat medium due to evaporation from a cistern tank without using a pressurizing system.

  The gist of the present invention for achieving the object lies in the inventions of the following items.

[1] a heat collecting device;
A heat dissipation device;
A tank for storing a liquid heat medium, which is open to the atmosphere through an opening;
A circulation path of a heat medium passing through the heat collecting device, the heat radiating device, and a cistern tank;
A circulation pump for circulating a heat medium in the circulation path;
A cooling unit for cooling the heat medium in the cistern tank;
The heat medium that circulates by driving the circulation pump controls the heat collecting operation in which the heat received by the heat collecting device is dissipated by the heat radiating device, and after the heat collecting operation is completed, A control unit for causing the cooling unit to perform a cooling operation for cooling;
A heat exchange system characterized by comprising:

  In the above invention, the heat medium in the cistern tank opened to the atmosphere is cooled by the cooling unit after the end of the heat collecting operation in which the heat circulated by the circulating heat medium is radiated by the heat radiating device. When the temperature of the heat medium decreases after the heat collection operation ends, outside air enters the cistern tank as the volume of the heat medium shrinks, but when the temperature decreases slowly, the heat medium evaporates and the air in the cistern tank continues. Drops in temperature with 100% humidity. When the next heat collecting operation is started after the temperature is sufficiently lowered, the heat medium expands in volume, and the 100% humidity air in the cistern tank is expelled to the outside, and the heat medium is reduced accordingly. On the other hand, when the cooling operation is performed after the heat collection operation is completed, the evaporation amount of the heat medium is reduced, so that the humidity of the outside air that has entered the cistern tank due to the volume contraction of the heat medium does not reach saturation. Therefore, the humidity of the air expelled from the cistern tank when the next heat collecting operation starts is lower than that in the case where the cooling operation is not performed, and the decrease in the heat medium can be suppressed to that extent.

[2] A hot water storage tank that stores hot water supplied to the hot spring and is replenished with water from the water supply channel,
The heat collecting device collects solar heat,
The heat radiating device is a heat exchanger that exchanges heat with water in the hot water storage tank. The heat exchange system according to [1].

  In the said invention, a heat exchange system is a hot water storage system which heats the water in a hot water storage tank using solar heat.

[3] The circulation path includes a first circulation path that passes through the heat collection device, the heat dissipation device, and the cistern tank, and a first route that bypasses the heat collection device and passes through the heat dissipation device and the cistern tank. It is configured to be switchable between 2 circulation paths,
The cooling operation by the cooling unit is performed by operating the circulation pump with the circulation path as the second circulation path in a state where the water temperature around the heat exchanger is lower than the temperature of the heat medium in the cistern tank. The heat exchange system according to [2], characterized in that it exists.

  In the above invention, the heat medium is cooled by moving the heat of the heat medium in the cistern tank to the hot water in the hot water storage tank. That is, if the heat medium is circulated in the first circulation path, for example, heat dissipation in the cold heat collecting device at night progresses, and the temperature drops to the hot water in the hot water storage tank. Since the cooling operation is performed by switching to the second circulation path that bypasses the heat collecting device and passes through the cistern tank and the heat exchanger, the above problem does not occur, and the heat of the heat medium is transferred to the hot water in the hot water storage tank. Can be used to raise the temperature.

[4] The heat exchanging system according to [2] or [3], wherein the control unit performs the cooling operation after the heat collecting operation is completed for one day.

  In the above invention, the heat medium is hot after the end of the one-day heat collection operation, but the heat of the heat medium is not used in the subsequent heat collection operation. Therefore, it is appropriate as the execution time of the cooling operation.

  According to the heat exchange system of the present invention, it is possible to prevent the heat medium from being reduced due to evaporation from the cistern tank without using a pressurizing system.

It is explanatory drawing which shows the structure of the hot water supply system containing the heat exchange system (hot water storage system) of this invention. It is explanatory drawing which shows schematic structure of the water heater as an auxiliary heat source machine. It is explanatory drawing which shows schematic operation | movement of heat collecting operation. It is explanatory drawing which shows schematic operation | movement of a hot water supply driving | operation. It is explanatory drawing which shows schematic operation | movement of a solar reheating operation. It is explanatory drawing which shows schematic operation | movement of a bath heat recovery driving | operation. It is explanatory drawing which shows the driving | running state in hot water storage hot water prohibition. It is explanatory drawing which shows schematic operation | movement of a cooling operation. It is a flowchart which shows operation | movement of a cooling operation.

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

  FIG. 1 shows a configuration of a hot water supply system 10 including a hot water storage system as a heat exchange system of the present invention. The hot water supply system 10 includes a hot water storage system 11 and a hot water heater 12 as an auxiliary heat source machine.

  The hot water storage system 11 includes a hot water storage tank 14 that stores hot water heated using sunlight, and supplies hot water from the hot water storage tank 14 to the water inlet of the water heater 12. The hot water heater 12 serving as an auxiliary heat source device fulfills the function of heating the water supplied from the hot water storage system 11 to a set temperature as needed and discharging the hot water to the hot water supply pipe 13. The hot water storage system 11 preferentially uses hot water heated by sunlight to suppress heating by the hot water heater 12 (hereinafter referred to as “follow-up heating”), and to save hot water with energy saving. Enable.

  A detailed configuration of the hot water storage system 11 will be described. The hot water storage tank 14 is a hollow, substantially cylindrical tank, and has piping connection ports at the bottom and the ceiling. The terminal end of the water supply pipe 15 is connected to the bottom pipe connection port. One end of the connection pipe 16 is connected to the pipe connection port of the ceiling, and the other end of the connection pipe 16 is connected to the water inlet of the water heater 12.

  A mixing valve 17 that mixes hot water and hot water from the hot water storage tank 14 is provided in the middle of the connection pipe 16. Here, the mixing valve 17 includes two valves, a first valve 17a and a second valve 17b. The first valve 17 a is inserted in the connection pipe 16. The second valve 17b is inserted in the middle of the branch water supply pipe 15a which branches from the middle of the water supply pipe 15 and merges with the connection pipe 16 on the water heater 12 side of the first valve 17a. The first valve 17a and the second valve 17b are water amount adjusting valves whose opening degrees (water flow amount) can be adjusted from 0% to 100%, respectively. The mixing ratio of hot water and hot water from the hot water storage tank 14 is adjusted by the opening degree of the first valve 17a and the second valve 17b.

  The hot water storage tank 14 has, for example, a capacity of 100 liters, and a first temperature sensor 41 for detecting the water temperature at a water level of 20 liters from the bottom is located at a water level of 40 liters from the bottom. The second temperature sensor 42 for detecting the water temperature of the water is located at a location where the water level is 60 liters from the bottom, and the third temperature sensor 43 for detecting the water temperature at that location is located at the location where the water level is 80 liters from the bottom. A fourth temperature sensor 44 for detecting the above is provided.

  In addition, the connection piping 16 in the vicinity of the piping connection port on the ceiling of the hot water storage tank 14 is provided with a tank hot water temperature sensor 46 that detects the temperature of the hot water coming out of the hot water storage tank 14. A water supply temperature sensor 47 for detecting the water supply temperature is provided in the middle of the water supply pipe 15. Further, a water amount sensor 48 is detected in the connection pipe 16 on the outlet side (hot water heater 12 side) of the mixing valve 17, and the temperature of hot water after mixing is detected by the mixing valve 17 on the downstream side (hot water heater 12 side). A mixed temperature sensor 49 is provided.

  A heat exchange pipe 18 that forms part of the heat medium circulation path 22 is inserted through the lower part of the hot water storage tank 14. The heat medium circulation path 22 circulates the heat medium (here, water) via the heat exchange pipe 18, the cistern 19, the water-water heat exchanger 20, and the solar heat collecting device 21. It is a route.

  Specifically, the heat medium circulation path 22 includes the first heat medium pipe 22 a extending from the outlet side of the heat exchange pipe 18 to the inlet side of the cistern 19 and the inlet of the water-water heat exchanger 20 from the outlet side of the cistern 19. The second heat medium pipe 22b extending to the side, the third heat medium pipe 22c extending from the outlet side of the water-water heat exchanger 20 to the inlet side of the heat collector 21, and for heat exchange from the outlet side of the heat collector 21. It consists of a fourth heat medium pipe 22d that reaches the entry side of the pipe 18. In the figure, the heat collecting device 21 is a component of the hot water storage system 11, but may be an external device.

  The cistern 19 is a tank for storing a heat medium circulating in the heat medium circulation path 22. In addition, the cistern 19 is a tank that is open to atmospheric pressure, and removes air mixed in the heat medium circulation path 22 and absorbs volume fluctuation due to expansion and contraction of the heat medium. The heat medium outlet is located at the bottom of the cistern 19, and the heat medium inlet from the heat exchange pipe 18 is provided to some extent above the outlet. The opening 19b for opening to the atmosphere is provided in the upper part (above the assumed maximum water level) of the cis turn 19, and a tube 19c extending downward and having an open end is connected to the outside of the opening 19b for opening to the atmosphere. ing. In addition, the cistern 19 includes a water level sensor 19a that detects an internal water level. The water level sensor 19a of this example includes a low water level detection electrode, a high water level detection electrode, and a common electrode.

  The water-water heat exchanger 20 has two pipes in close contact with each other over a predetermined length, and plays a role of transferring heat from a high temperature side pipe to a low temperature side pipe. The heat medium circulation path 22 is connected to the entry side and the exit side of one pipe line (in the figure, the inner pipe line 20a) of the water-water heat exchanger 20.

  A circulation pump 24 is provided in the middle of the third heat medium pipe 22c from the outlet side of the water-water heat exchanger 20 (inner pipe line 20a) to the inlet side of the heat collector 21. The circulation pump 24 sends the heat medium in the third heat medium pipe 22c to the heat collector 21 side. A switching valve 25 is inserted in the third heat medium pipe 22 c on the downstream side of the circulation pump 24. A third heat medium pipe 22c from the circulation pump 24 side is connected to the first connection port 25a of the switching valve 25, and a third heat medium reaching the heat collector 21 side is connected to the second connection port 25b of the switching valve 25. A pipe 22c is connected. One end of a connection pipe 26 is connected to the third connection port 25c of the switching valve 25, and the other end of the connection pipe 26 is a fourth heat medium pipe extending from the heat collecting device 21 to the entrance side of the heat exchange pipe 18. 22d is joined and connected in the middle.

  The switching valve 25 allows the first connection port 25a and the second connection port 25b to communicate with each other and the third connection port 25c to close, and the first connection port 25a and the third connection port 25c to communicate with each other. It switches to the 2nd state which closed connection port 25b.

  The main body of the hot water storage system 11 such as the hot water storage tank 14 is installed on the ground, and the heat collecting device 21 is installed on the roof above the main body of the hot water storage system 11. Of the third heat medium pipe 22c, a part of the connecting piping from the connecting part 27a with the main body side of the hot water storage system 11 to the heat collecting device 21 and a part returning from the heat collecting apparatus 21 to the connecting part 27b with the main body side of the hot water storage system 11 Cross-linked polyethylene pipe is used for the connecting pipe. The heat resistance temperature of the cross-linked polyethylene pipe is 90 ° C. to 95 ° C. depending on the water pressure and the set service life.

  The heat collector 21 is provided with a high temperature sensor 51 that detects the temperature of hot water in the heat collector 21. Further, a heat medium temperature sensor 52 for detecting the temperature of the heat medium passing through the fourth heat medium pipe 22d on the heat exchanging pipe 18 side is provided in the middle of the joint connection place of the connecting pipe 26.

  The water heater 12 heats the hot water supplied from the water inlet to a set temperature and discharges it to the hot water supply pipe 13, and also heats the water supplied from the water inlet to the set temperature of the bath and pours it into the bathtub 3. It has a tensioning function and a chasing function for chasing hot water in the bathtub 3.

  The recirculation path for circulating hot water during reheating is a bath return pipe 32 for taking hot water from the bathtub 3 into the water heater 12, a pipe passing through the heat exchanger in the water heater 12, and the heat exchanger. It comprises a bath outlet pipe 31 for sending warm hot water to the bathtub 3 and the like. The bath outlet pipe 31 reaches the bathtub 3 via the other pipe line (outer pipe line 20b in the figure) of the water-water heat exchanger 20 on the way.

  Between the water heater 12 and the water-water heat exchanger 20, a bath temperature sensor 53 for detecting the temperature of hot water taken from the bathtub 3 is provided.

  In addition, the connecting pipe 16 between the tank hot water temperature sensor 46 and the mixing valve 17 (first valve 17a) is provided with a hot water prohibiting electromagnetic valve 54 for switching between closing and opening of the connecting pipe 16. Further, two branch pipes branched from the connection pipe 16 are provided between the hot water prohibition solenoid valve 54 and the tank hot water temperature sensor 46, and a drain electromagnetic valve 55 is provided at one end of the branch pipe and the other branch pipe is provided. Is provided with a pressure relief valve 56. Further, a water filter, a pressure reducing valve, a check valve and the like are inserted in the water supply pipe 15.

  The hot water storage system 11 includes a control unit 60 that performs overall control of the operation of the hot water storage system 11. The control unit 60 temporarily stores a CPU (Central Processing Unit), a flash ROM (Read Only Memory) in which programs executed by the CPU, fixed data, and the like are stored, and various information when the CPU executes the programs. A RAM (Random Access Memory), an I / F unit for inputting / outputting various signals, and the like are configured as circuits. Detection signals from various sensors of the hot water storage system 11 are input to the control unit 60. In addition, a control signal is output from the control unit 60 to the control target such as each valve and the circulation pump 24.

  The control unit 60 of the hot water storage system 11 exchanges necessary information with the control base 70 of the water heater 12. Here, the control unit 60 provides information on the set temperature set on the water heater 12 side, information indicating whether or not the water heater 12 is in a chasing operation, time information on the clock unit of the water heater 12, and the like. Obtained from the vessel 12. Further, a signal for instructing combustion prohibition / permission and a signal for driving the bath circulation pump 85 (see FIG. 2) without burning the burner 73 (bath pump drive signal) are sent from the control unit 60 to the control board 70 of the water heater 12. Send.

  FIG. 2 shows a schematic configuration of the water heater 12. The water heater 12 includes a hot water supply water pipe 72a in which a water inlet pipe 71 is connected to the inlet side and a hot water supply pipe 13 to the outlet side, and a bath return pipe 31 on the outlet side and a bath return pipe 32 to the inlet side. A one-can two-water channel type heat exchanger 72 provided with a water pipe 72b for watering is provided. The starting end of the water intake pipe 71 is a water inlet to which the connection pipe 16 from the hot water storage system 11 side is connected.

  The heat exchanger 72 includes a large number of fins 72c for receiving heat from the burner 73 disposed below. A gas supply pipe 74 is connected to the burner 73. In the middle of the gas supply pipe 74, a gas valve 75 for switching supply / cutoff of gas, a proportional valve 76 for adjusting the amount of supply gas, and the like are provided.

  The hot water supply pipe 13 and the bath return pipe 32 are connected by a connecting pipe 77, and a pouring electromagnetic valve 78 that switches between closing and opening of the connecting pipe 77 is provided in the middle of the connecting pipe 77. Further, in the middle of the hot water supply pipe 13 upstream from the connection point of the connecting pipe 77, a water amount servo 79 capable of adjusting the opening degree from the closed state to the fully opened state is provided in order to adjust the amount of discharged hot water. A tapping temperature sensor 80 for detecting tapping temperature is provided on the downstream side of the water amount servo 79.

  Furthermore, a bypass pipe 81 branched from the water inlet pipe 71 and joined to and connected to the hot water supply pipe 13 at a predetermined location on the hot water supply water pipe 72a side from the water quantity servo 79 is provided. A bypass adjustment valve 82 capable of adjusting the degree is provided. The inlet pipe 71 upstream of the branching point of the bypass pipe 81 is provided with a flow rate sensor 83 that detects the flow rate of water in the inlet pipe 71 and an incoming temperature sensor 84 that detects the incoming water temperature. In addition, in the instrument which estimated the incoming water temperature by calculation, the incoming water temperature sensor 84 may not be provided.

  In the middle of the bath return pipe 32, there is provided a bath circulation pump 85 for circulating the water in the bathtub 3 through the reheating circulation path (the bath return pipe 32, the reheating water pipe 72b, the bath going-out pipe 31). . A flowing water switch 86 provided in the bath return pipe 32 detects whether water is actually circulating in the recirculation path when the bath circulation pump 85 is operated.

  In addition, a bath-out temperature sensor 87 and a bath-return temperature sensor 88 are provided in the bath-out tube 31 and the bath-return tube 32, respectively.

  The control board 70 includes a CPU, a flash ROM that stores programs executed by the CPU, fixed data, and the like, and a RAM that temporarily stores various types of information when the CPU executes programs. Has been. Various sensors, valves, bath circulation pumps 85 and the like that the water heater 12 has are connected to the control base 70.

  Further, an operation panel (remote control) 89 is connected to the control board 70 via wiring. The operation panel 89 includes a switch for receiving various operations from the user, such as designation of a set temperature for hot water supply and a set temperature for a bath, start / end instructions for hot water filling and reheating, and power on / off, It consists of a display unit that displays the set temperature. The operation panel 89 also includes a clock unit 89a that measures time. The time counted by the clock unit 89a is displayed on the display unit of the operation panel 89. Further, the time information counted by the clock unit 89a is notified to the control unit 60 of the hot water storage system 11.

  In the hot water supply operation for discharging hot water from the hot water supply pipe 13, the control base 70 of the water heater 12 opens the combustion amount of the burner 73 and opens the bypass adjustment valve 82 so that hot water at the hot water supply set temperature set by the user on the operation panel 89 is discharged. Control the degree.

  In the hot water filling operation for pouring water into the bathtub 3, the control base 70 is heated through the hot water supply water pipe 72 a of the heat exchanger 72 by opening the hot water solenoid valve 78 and the water amount servo 79 with the burner 73 burned. Hot water is sent from the hot water supply pipe 13 to the connecting pipe 77 and flows into the bathtub 3 through both the bath return pipe 32 and the bath outlet pipe 31. At this time, the control board 70 controls the combustion amount of the burner 73, the opening degree of the bypass adjustment valve 82, and the like so that hot water having a bath set temperature set by the user on the operation panel 89 is poured. Further, when the water level in the bathtub 3 reaches the set water level, the pouring operation is stopped and the reheating operation is performed.

  In the reheating operation, the pouring electromagnetic valve 78 is closed, and the burner 73 is burned with the bath circulation pump 85 activated. As a result, the hot water in the bathtub 3 is taken into the water heater 12 through the bath return pipe 32 and heated, and the hot water after overheating is sent out to the bathtub 3 through the bath outlet pipe 31.

  The burner 73 of the water heater 12 cannot be combusted below a predetermined minimum heating amount (minimum number). Therefore, the control board 70 of the water heater 12 controls the burner 73 to be in a state where the burner 73 is burned off when the heating amount necessary for taking out the hot water at the set temperature is smaller than the minimum heating amount. The necessary amount of heating is calculated based on the temperature difference between the set temperature and the incoming water temperature detected by the incoming water temperature sensor 84, the flow rate detected by the flow sensor 83, the thermal efficiency, and the like.

  Next, various operations of the hot water storage system 11 will be described.

<Heat collection operation>
FIG. 3 shows a schematic operation of the heat collecting operation performed by the hot water storage system 11. The heat collecting operation is an operation of heating the water in the hot water storage tank 14 using heat obtained from sunlight by the heat collecting device 21. The heat collection operation is performed when an operation condition is satisfied such that the temperature detected by the high temperature sensor 51 of the heat collection device 21 is higher than the water temperature in the hot water storage tank 14 by a certain temperature or more.

  The hot water storage tank 14 receives supply of water from a water supply pipe 15 connected to a pipe connection port at the bottom, and is normally in a full state. During the heat collection operation, the control unit 60 sets the switching valve 25 to the first state (heat collection side) in which the first connection port 25a and the second connection port 25b communicate with each other and the third connection port 25c is closed. The circulation pump 24 is driven.

  In FIG. 3, the path through which the heat medium (water) circulates in the heat collecting operation is indicated by a bold line. The direction in which the heat medium flows in each part is indicated by arrows. Specifically, the heat medium in the cistern 19 flows toward the heat collecting device 21 through the third heat medium pipe 22c or the like by the action of the circulation pump 24, and is heated and heated when passing through the heat collecting device 21. Then, the refrigerant circulates from the fourth heat medium pipe 22d through the heat exchanging pipe 18 in the hot water storage tank 14 to return to the system 19. When the water temperature in the hot water storage tank 14 is lower than the heat medium passing through the heat exchange pipe 18, the heat of the heat medium moves to the water in the hot water storage tank 14 through the heat exchange pipe 18 and the water in the hot water storage tank 14 is heated. Is done.

  The heat exchange pipe 18 is located below the hot water storage tank 14, and water is supplied from the bottom of the hot water storage tank 14, and hot water flows out from the ceiling of the hot water storage tank 14 to the connection pipe 16. Has a lower temperature and a higher temperature gradient at the ceiling.

  In the present embodiment, a cooling operation to be described later is performed after the end of the heat collecting operation on the 1st.

<Hot water supply operation>
FIG. 4 shows a schematic operation of the hot water supply operation. In FIG. 4, a path through which hot water flows in the hot water supply operation is indicated by a thick line. The direction in which hot water flows in each part is indicated by arrows. In the hot water supply operation, hot water from the hot water storage tank 14 and water supplied from the branch water supply pipe 15a are mixed by the mixing valve 17 and supplied to the water inlet (water inlet pipe 71) of the water heater 12. The hot water heater 12 heats the supplied water as necessary so that the hot water is discharged at a set temperature, and discharges the hot water to the hot water supply pipe 13.

<Solar chasing operation>
FIG. 5 shows a schematic operation of the solar reheating operation. The solar reheating operation is an operation in which hot water in the bathtub 3 is supplementarily replenished using heat obtained from sunlight by the heat collecting device 21.

  In the solar reheating operation, the control unit 60 sets the switching valve 25 to the first state in which the first connection port 25a and the second connection port 25b communicate with each other and the third connection port 25c is closed, and then the circulation pump 24 Drive. That is, the heat medium is circulated in the same manner as in the heat collection operation, and the heat medium is heated by the heat collection device 21. Further, in the solar reheating operation, the control unit 60 instructs the water heater 12 to drive the bath circulation pump 85 in a state where combustion (heating operation) is stopped.

  In FIG. 5, the path through which the heat medium (water) circulates in the solar reheating operation is indicated by a thick line. Moreover, the circulation path of bathtub water is shown with the thick broken line. Furthermore, the direction in which the heat medium flows and the direction in which the bath water flows are indicated by arrows in each part. In the solar reheating operation, the operation condition is that the temperature of the heat medium circulating in the heat medium circulation path 22 is higher than the temperature of the bath water, and the water-water heat exchanger 20 passes through the inner pipe line 20a. The bathtub water is heated by heat moving from the heat medium to the bathtub water passing through the outer pipe line 20b.

<Bath heat recovery operation>
FIG. 6 shows a schematic operation of the bath heat recovery operation. The bath heat recovery operation is an operation of heating the hot water in the hot water storage tank 14 using the heat of the remaining hot water in the bath.

  In the bath heat recovery operation, the control unit 60 sets the switching valve 25 to the second state in which the first connection port 25a and the third connection port 25c communicate with each other and closes the second connection port 25b, and then the circulation pump 24. Drive. As a result, the heat medium circulates through the water-water heat exchanger 20 and the hot water storage tank 14 without passing through the heat collector 21. Further, the hot water heater 12 is instructed to drive the bath circulation pump 85 in a state where combustion (heating operation) is stopped. As a result, the bathtub water circulates in the recirculation circulation path including the outer conduit 20 b of the water-water heat exchanger 20.

  In FIG. 6, the path through which the heat medium (water) circulates in the bath heat recovery operation and the circulation path of the bath water are indicated by bold lines. Moreover, the circulation path of bathtub water is shown with the thick broken line. Furthermore, in each part, the direction in which the heat medium flows and the direction in which the bathtub water flows are indicated by arrows. The bath heat recovery operation has an operation condition such that the water temperature in the hot water storage tank 14 (first temperature sensor 41) is lower than the water temperature in the bathtub 3, and the water-water heat exchanger 20 passes through the outer conduit 20b. Heat moves from the bathtub water to the bathtub water passing through the inner pipe line 20a, and this heat moves to the water in the hot water storage tank 14 through the heat exchange pipe 18, whereby the water in the hot water storage tank 14 is heated. As a result, exhaust heat in the home can be collected, and the amount of energy consumed by the water heater 12 can be reduced even if the next day is rainy or the like and solar heat is not collected.

  The bath heat recovery operation is performed, for example, when the operation (power) switch of the bath remote control of the bath is turned off, or when a set time (for example, 10 o'clock at night) comes, or a dedicated bath heat recovery operation button This is done when is pressed. At the start of the bath heat recovery operation, first, the bath circulation pump 85 is temporarily activated to check whether there is bathtub water. Then, when there is bathtub water and the temperature of the bathtub water is higher than the temperature detected by the first temperature sensor 41 by a predetermined temperature (for example, 15 ° C.) or more, the bath heat recovery operation is performed, and the difference is 10 ° C. or less or 1 hour. If it exceeds, driving is stopped. The time limit is based on the durability of the bath circulation pump 85.

<No hot water storage or hot water operation>
If the hot water in the hot water storage tank 14 is stopped for 100 hours or more, there is a problem due to reproduction of Legionella bacteria, and sterilization is performed as a countermeasure. In the hot water storage hot water prohibition operation, hot water discharge from the hot water storage tank 14 is prohibited, and sterilization is performed by continuing the state in which the water in the hot water storage tank 14 is 60 degrees or more for 15 minutes or longer.

  FIG. 7 shows an operating state during hot water storage / outflow prohibition. If most of the hot water in the hot water storage tank 14 is not used within 98 hours (here, 93 liters in 100 liters), the hot water storage hot water discharge prohibition operation is started. In the hot water storage hot water prohibition operation, the control unit 60 closes the hot water prohibition electromagnetic valve 54. Thereby, only the water supply from the branch water supply pipe 15 a is supplied to the water inlet of the water heater 12 through the connection pipe 16.

  Within 100 hours after entering the hot water storage / outflow prohibition operation, the entire hot water in the hot water storage tank 14 (first temperature sensor 41, second temperature sensor 42, third temperature sensor 43, fourth temperature sensor) by heat collection operation (solar heat). All the detected temperatures of 44) are monitored for 15 minutes or more in the state of 60 degrees or more (sterilization is completed). When sterilization is completed, the hot water prohibition solenoid valve 54 is opened to end the hot water storage and hot water prohibition operation. .

  If sterilization is not completed within 100 hours, the drainage solenoid valve 55 is opened, all hot water in the hot water storage tank 14 is drained with fresh water supplied from the bottom of the tank, and new water is filled in the hot water storage tank 14. Then, the hot water prohibition solenoid valve 54 is opened to end the hot water storage hot water prohibition operation.

<Cooling operation>
FIG. 8 shows a schematic operation of the cooling operation. The cooling operation is an operation for cooling the heat medium in the cistern 19 after completion of the heat collecting operation. In the cooling operation, the control unit 60 sets the switching valve 25 in the second state in which the first connection port 25a and the third connection port 25c communicate with each other and closes the second connection port 25b, and then drives the circulation pump 24. To do.

  In FIG. 8, the path through which the heat medium (water) circulates in the cooling operation is indicated by a bold line. The direction in which the heat medium flows in each part is indicated by arrows. After completion of the heat collecting operation, the control unit 60 is configured such that the water temperature around the heat exchange pipe 18 in the hot water storage tank 14 (detected temperature of the first temperature sensor 41) is lower than the temperature of the heat medium in the systern 19 by a certain temperature or more. When the predetermined condition is satisfied, the cooling operation is started. In this cooling operation, the heat of the circulating heat medium moves to the water in the hot water storage tank 14 through the heat exchange pipe 18, and the heat medium in the cistern 19 is cooled. In this example, the cooling operation is performed after the end of the heat collecting operation on the 1st.

  When the cooling operation is not performed, the heat medium in the cistern 19 after the heat collecting operation is at a high temperature, the evaporation of the heat medium in the cistern 19 is thriving, and the water vapor pressure in the cistern 19 is 100% (humidity 100 %, Saturated water vapor). When the temperature of the heat medium is slowly lowered at night, the volume of the heat medium is gradually decreased and the outside air gradually enters the cistern 19 from the opening 19b for opening to the atmosphere. Since the evaporation of the water continues, the temperature drops while maintaining the state where the water vapor pressure is 100%.

  The next morning when the sun comes out, the heat medium in the heat collecting device 21 suddenly rises in temperature and expands in volume. As a result, the water level in the cistern 19 rises and the 100% humidity air in the cistern 19 is expelled from the opening 19b for opening to the atmosphere.

  On the other hand, when the cooling operation is performed after the heat collecting operation is finished, the volume of the heat medium is reduced by the cooling, and the cold air suddenly enters the cistern 19 from the opening 19b for opening to the atmosphere. For this reason, the humidity is suddenly reduced to, for example, about 50%. However, since the cooled heat medium has a small amount of evaporation, the humidity in the cistern 19 is not saturated even after one night. When the sun comes out the next morning, the heat medium in the heat collecting device 21 suddenly rises in temperature and expands in volume, but the heat medium in the cistern 19 is still cold and the amount of evaporation does not increase. Therefore, when the water level in the cistern 19 rises due to volume expansion, unsaturated air in the cistern 19 is expelled from the opening 19b for opening to the atmosphere.

  Thus, when the cooling operation is not performed, air with a humidity of 100% comes out the next morning, whereas when the cooling operation is performed, air with a low humidity comes out compared to the case where the cooling operation is not performed. Accordingly, the amount of reduction of the heat medium can be reduced.

  FIG. 9 shows the flow of operations related to the cooling operation. When the power source of the hot water storage system 11 is turned on, the control unit 60 communicates with the control base 70 of the water heater 12 to obtain time information of the clock unit 89a on the water heater 12 side. If the time is not set (step S101; No), the process returns to step S101 and waits for the time setting.

  If the time is set, it is checked whether or not the acquired time is after 20:00 (between 20:00 and 24:00) (step S102), and if not after 20:00 (step S102; No) ), Return to step S101, and wait until 22:00.

  If it is after 22:00 (step S102; Yes), it is investigated whether or not the heat collection operation is being performed (step S103). If the heat collection operation is being performed (step S103; Yes), the process returns to step S101. When the time setting is correct, the heat collection operation is controlled not to start after 19:00.

  If the heat collecting operation is not being performed (step S103; No), it is determined that the heat collecting operation for one day has been completed. Then, it is checked whether or not 5 hours have passed since the last cooling operation (step S104). If not (step S104; No), the process returns to step S101.

  When 5 hours or more have elapsed since the previous cooling operation (step S104; Yes), the temperature detected by the first temperature sensor 41 that detects the water temperature around the heat exchange pipe 18 in the hot water storage tank 14 (tank TH1 temperature). ) Is checked to see if it is 35 ° C. or lower (step S105).

  If it is 35 degrees C or less (step S105; Yes), a cooling operation will be started (step S107). Specifically, the circulation pump 24 is driven, and the switching valve 25 is switched to the second state (heat recovery side) in which the first connection port 25a and the third connection port 25c are communicated and the second connection port 25b is closed.

  When the detected temperature of the first temperature sensor 41 exceeds 35 ° C. (step S105; No), before the time becomes 22:00 (step S106; No), the process returns to step S105 and waits for 35 ° C. or less. When the time is after 22:00 (step S106; Yes), the cooling operation is forcibly started (step S107).

  When one minute has elapsed after the start of the cooling operation (step S108; Yes), it is determined whether or not the detected temperature of the heat medium temperature sensor 52 is equal to or lower than the detected temperature of the first temperature sensor 41 + 10 ° C. (step S109). ). That is, since the hot water storage system 11 of this example does not include a temperature sensor in the cis turn 19, the circulation pump 24 is operated to circulate the heat medium, and from the outlet of the cis turn 19 to the inlet side of the heat exchange pipe 18. The temperature of the heat medium is detected by the heat medium temperature sensor 52 provided in the middle of the circulation path to obtain the temperature of the heat medium in the cistern 19.

  If the detected temperature of the heat medium temperature sensor 52 is equal to or lower than the detected temperature of the first temperature sensor 41 + 10 ° C. (step S109; Yes), the circulation pump 24 is stopped (step S111), the cooling operation is terminated, and step S101 is performed. Return to.

  That is, the start of the cooling operation in step S107 is for detecting the temperature of the heat medium by the heat medium temperature sensor 52, and the heat medium in the cistern 19 detected by the heat medium temperature sensor 52 one minute after the start. It is a substantial starting condition for the cooling operation that the temperature of the first temperature sensor 41 is 10 ° C. or more higher than the detected temperature of the first temperature sensor 41. In consideration of heat dissipation efficiency, the temperature detected by the first temperature sensor 41 + 10 ° C. ≧ the temperature of the heat medium is satisfied. However, at least the condition that the temperature detected by the first temperature sensor 41 is greater than the temperature of the heat medium must be satisfied. For example, the cooling operation may be started.

  When the detected temperature of the heat medium temperature sensor 52 exceeds the detected temperature of the first temperature sensor 41 + 10 ° C. (step S109; No), it is checked whether 9 minutes have passed since the start of the cooling operation (step S110). If 9 minutes have passed (step S110; Yes), the circulation pump 24 is stopped (step S111), the cooling operation is terminated, and the process returns to step S101. If nine minutes have not elapsed (step S110; No), the process returns to step S109. That is, the cooling operation is continued until at least one of (1) 9 minutes from the start of operation or (2) the detected temperature of the heat medium temperature sensor 52 is equal to or lower than the detected temperature of the first temperature sensor 41 + 10 ° C. The process ends when either one is established.

  Thus, by performing the regular cooling operation after the end of the heat collecting operation on the 1st, the humidity of the air in the cis turn 19 can be kept low until the next morning as described above, Reduction of the heat medium due to outflow from the opening 19b for opening the air to the atmosphere can be reduced. In addition, unlike the case of employing a pressure lid with a radiator structure for automobiles, it is not necessary to make the circulation system of the heat medium a pressurizing system. For this reason, for example, a crosslinked polyethylene pipe can be used for piping.

  In the cooling operation, the switching valve 25 is switched to the second state to circulate the heat medium, so that the heat can be used to heat the hot water in the hot water storage tank 14 when the heat medium is cooled. That is, when the cooling medium is circulated by circulating the heat medium while the switching valve 25 is in the first state, the heat medium is circulated via the heat collecting device 21, the cistern 19, and the heat exchange pipe 18. Therefore, for example, when heat is radiated by the cold heat collecting device 21 at night, the temperature drops to the hot water in the hot water storage tank. However, in the present embodiment, the cooling operation is performed by bypassing the heat collecting device 21 and switching to the circulation path via the systern 19 and the heat exchanging pipe 18, so that the above problem does not occur and the heat medium Heat can be used to raise the temperature of hot water in the hot water storage tank 14.

  Further, since the switching of the switching valve 25 to the second state is also used for the bath heat recovery operation, the system is configured and operated more efficiently than when a circulation path switching unit is provided exclusively for the cooling operation. can do.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  In the embodiment, the cooling operation is performed after the end of the heat collecting operation of the day. However, the embodiment is not limited to the operation after the end of the heat collecting operation of the day as long as the heat collecting operation is ended.

  In the embodiment, the heat medium is cooled by switching the switching valve 25 to the second state and circulating the heat medium. However, the cooling method is not limited to this. A dedicated cooling unit such as a fan may be provided. In addition, the cold heat collecting device 21 at night acts as a radiator. In view of this, the heat medium circulation path 22 is switched so that the heat medium is circulated by bypassing the heat exchange pipe 18 on the hot water storage tank 14 side and passing through the systern 19 and the heat collecting device 21. The pump 24 may be driven to cool the heat medium in the cistern 19. In this case, the heat of the heat medium is not used for heating the hot water storage tank 14 but is released by the heat collecting device 21. For example, even when the water temperature in the hot water storage tank 14 is high, the heat medium is reliably cooled. It can be carried out.

  Further, in the embodiment, the heat collector 21 collects solar heat and the hot water storage system 11 that raises the temperature of the water in the hot water storage tank 14 with the heat of the heat medium has been described as an example. It is not limited to things. For example, the exhaust heat of a generator may be used. Also, the heat dissipation device can be a heating device. In the embodiment, the water-water heat exchanger 20 is provided for the solar reheating operation, the bath heat recovery operation, and the like. However, the water-water heat exchanger 20 may not be provided.

  In addition, the heat medium is not limited to water, and the present invention is applied to any liquid that evaporates.

  Since the hot water heater 12 cannot perform a heating operation below the minimum heating amount, the burner 73 is not combusted when the tapping temperature exceeds the set temperature when the minimum heating amount is heated. Although it is made not to burn when filling with hot water, it may be made to burn when using a shower or hot water supply. This is because there are people who enter the tub as “donbon” (it takes time to get hot water), but when you use the shower or hot water, you can avoid the shower, This is because it can be removed. Further, since the temperature at which the shower is taken is considered to be 45 degrees or less, for example, when the hot water is filled in the bathtub, the hot water is not burned when the hot water is used at a predetermined temperature or lower, but may be burned when the hot water is used at a predetermined temperature or higher.

DESCRIPTION OF SYMBOLS 3 ... Bathtub 10 ... Hot water supply system 11 ... Hot water storage system 12 ... Hot water supply device 13 ... Hot water supply pipe 14 ... Hot water storage tank 15 ... Water supply pipe 15a ... Branch water supply pipe 16 ... Connection pipe 17 ... Mixing valve 17a ... First valve 17b ... Second valve DESCRIPTION OF SYMBOLS 18 ... Piping for heat exchange 19 ... Systurn 19a ... Water level sensor 19b ... Opening for atmosphere 19c ... Tube 20 ... Water-water heat exchanger 20a ... Inner pipe line 20b ... Outer pipe line 21 ... Heat collecting device 22 ... Heat medium Circulation path 22a ... 1st heating medium piping 22b ... 2nd heating medium piping 22c ... 3rd heating medium piping 22d ... 4th heating medium piping 24 ... Circulation pump 25 ... Switching valve 25a ... 1st connection port 25b ... 2nd connection port 25c ... 3rd connection port 26 ... Connecting pipe 27a ... Connection part (outward) with main body side
27b: Connection with the main body (return)
DESCRIPTION OF SYMBOLS 31 ... Bath going pipe 32 ... Bath return pipe 41 ... 1st temperature sensor 42 ... 2nd temperature sensor 43 ... 3rd temperature sensor 44 ... 4th temperature sensor 46 ... Tank hot water temperature sensor 47 ... Supply water temperature sensor 48 ... Water quantity sensor 49 ... Mixing temperature sensor 51 ... High temperature sensor 52 ... Heat medium temperature sensor 53 ... Bath temperature sensor 54 ... Hot water prohibition solenoid valve 55 ... Drainage solenoid valve 56 ... Pressure relief valve 60 ... Control unit 60 ... Measurement chart 70 ... Control base 71 ... Inlet pipe 72 ... Heat exchanger 72a ... Hot water supply pipe 72b ... Additional cooking water pipe 72c ... Fin 73 ... Burner 74 ... Gas supply pipe 77 ... Connecting pipe 78 ... Pouring solenoid valve 79 ... Water quantity servo 81 ... Bypass pipe 82 ... Bypass Adjusting valve 83 ... Flow rate sensor 84 ... Incoming water temperature sensor 85 ... Bath circulation pump 86 ... Running water switch 87 ... Bathing temperature sensor 8 ... bath return temperature sensor 89 ... operation panel 89a ... watch part

Claims (4)

A heat collector,
A heat dissipation device;
A tank for storing a liquid heat medium, which is open to the atmosphere through an opening;
A circulation path of a heat medium passing through the heat collecting device, the heat radiating device, and a cistern tank;
A circulation pump for circulating a heat medium in the circulation path;
A cooling unit for cooling the heat medium in the cistern tank;
The heat medium that circulates by driving the circulation pump controls the heat collecting operation in which the heat received by the heat collecting device is dissipated by the heat radiating device, and after the heat collecting operation is completed, A control unit for causing the cooling unit to perform a cooling operation for cooling;
A heat exchange system characterized by comprising: It has a hot water storage tank that stores hot water supplied to the hot spring and is replenished with water from the water supply channel.
The heat collecting device collects solar heat,
2. The heat exchange system according to claim 1, wherein the heat radiating device is a heat exchanger that exchanges heat with water in the hot water storage tank. The circulation path includes a first circulation path that passes through the heat collection apparatus, the heat dissipation apparatus, and the cistern tank, and a second circulation path that bypasses the heat collection apparatus and passes through the heat dissipation apparatus and the cistern tank. And can be switched to
The cooling operation by the cooling unit is performed by operating the circulation pump with the circulation path as the second circulation path in a state where the water temperature around the heat exchanger is lower than the temperature of the heat medium in the cistern tank. The heat exchange system according to claim 2. The heat control system according to claim 2 or 3, wherein the control unit performs the cooling operation after the heat collecting operation of one day is completed.

Images