JPWO2017138226A1 - Circulation piping system and carbon dioxide-containing water supply system - Google Patents

Abstract

A water heater that is a circulation piping system includes a heat exchanger that heats water, a hot water storage tank that stores heated water, a circulation pipe that circulates water between the heat exchanger and the hot water storage tank, and a hot water storage tank. A hot water supply pipe for supplying hot water to the stored water, a bubble injection device for injecting bubbles into water, provided on the upstream side of the flow path flowing into the heat exchanger in the circulation pipe, and connected to the bubble injection device, containing carbon dioxide The apparatus includes a carbon dioxide supply device that supplies bubbles and a control unit. The control unit controls the bubble injection device heat exchanger and the carbon dioxide supply device so that bubbles containing carbon dioxide are intermittently injected into water.

Description

  The present invention relates to a circulation piping system and a carbon dioxide-containing water supply system that suppress the generation of scales adhering in a heat exchanger.

  Water heaters that supply hot water to bathrooms or kitchens are roughly divided into electric water heaters, gas water heaters (gas boilers), and oil water heaters. In each water heater, there is a heat exchanger for transferring heat to water. Is provided. In recent years, heat pump heat exchange type electric water heaters (heat pump water heaters) have attracted attention from the viewpoint of reducing carbon dioxide as an energy saving and global warming countermeasure. The principle of the heat pump water heater is to transfer atmospheric heat to a heat medium and boil hot water with the heat transferred to the heat medium. Since the heat pump water heater uses the heat of the atmosphere, more heat energy can be used than the energy required for operation.

  In heat exchangers, it is important to keep the heat transfer surface clean to transfer heat to the water. When the heat transfer surface is soiled, the effective heat transfer area is reduced and the heat transfer performance is deteriorated. Further, when dirt accumulates on the heat transfer surface, the flow path of the heat exchanger becomes narrow, and there is a concern that the operation load of the pump for flowing water increases or the flow path is blocked. In particular, when water containing a scale-forming factor (mainly hardness components such as calcium ions and magnesium ions) is supplied to the heat exchanger, a scale is formed and adheres to the heat transfer surface of the heat exchanger, There are concerns about problems such as a decrease in heat transfer performance, an increase in operating load of the pump, and blockage of the heat exchanger flow path.

Although the mechanism by which scale forming factors in water adhere to the inside of the heat exchanger as a scale is not completely clarified, molecules such as calcium carbonate precipitate at high temperature parts such as the heat transfer surface of the heat exchanger, It can be mentioned that scale crystal growth proceeds with this calcium carbonate as a nucleus. Calcium carbonate (CaCO ₃ ), which is a main factor of scale, exists in water based on the equilibrium represented by the following formula (1).

Here, if carbon dioxide (CO ₂ ) gas is supplied into water, the amount of carbon dioxide dissolved in water (dissolved CO ₂ ) increases, and the equilibrium of equation (1) proceeds to the right so as to relax dissolved CO ₂ , Calcium carbonate dissolves as calcium hydrogen carbonate (Ca (HCO ₃ ) ₂ ). Therefore, the effect of suppressing the precipitation of calcium carbonate molecules is expected by supplying carbon dioxide gas into water.

  For example, in Patent Document 1, as a scale removing device that suppresses the adhesion of calcium carbonate molecules by supplying carbon dioxide gas to water flowing into a heat exchanger, water flowing into the heat exchanger is continuously connected from a gas cylinder. And supplying carbon dioxide gas.

JP 2010-223525 A

  However, in the scale removing device described in Patent Document 1, since a gas cylinder is used, there are restrictions on the place of use, and maintenance such as cylinder replacement is necessary. There was a problem. In addition, since bubbles containing carbon dioxide gas are continuously injected, bubbles (gas) are mixed in the heat medium water to reduce the heat transfer area, resulting in low heat exchange efficiency. .

  The present invention has been made against the background of the problems described above, and suppresses the adhesion of scale by introducing bubbles containing carbon dioxide into water flowing into the heat exchanger without using a gas cylinder. The primary purpose is to provide a possible circulation piping system. A second object is to provide a circulation piping system and a carbon dioxide-containing water supply system capable of suppressing a decrease in heat exchange efficiency.

  A circulation piping system according to the present invention is connected to a circulation piping for circulating water between a first device and a second device, a bubble injection device for injecting bubbles into water, and a bubble injection device. A carbon dioxide supply device that supplies carbon dioxide to cause generation, and a controller that controls the bubble injection device and the carbon dioxide supply device so that bubbles containing carbon dioxide are intermittently injected into the water circulating in the circulation pipe. It is to be prepared.

  According to the present invention, it is possible to suppress a decrease in heat exchange efficiency without restricting the place of use, without requiring maintenance such as cylinder replacement, while suppressing scale adhesion to the heat exchanger of the circulation pipe. A circulation piping system can be provided.

It is an example of the block diagram of the circulation piping system which concerns on Embodiment 1 of this invention. It is an example of the block diagram which shows the bubble injection apparatus and carbon dioxide supply apparatus of the circulation piping system which concern on Embodiment 1 of this invention. It is a time chart explaining the pulse bubble in Embodiment 1 of this invention. It is an example of the block diagram explaining the operation | movement state of the circulation piping system which concerns on Embodiment 1 of this invention. It is an example of the block diagram explaining the operation | movement state of the circulation piping system which concerns on Embodiment 1 of this invention. It is an example which shows the bubble injection apparatus of the circulation piping system which concerns on Embodiment 1 of this invention. It is an example of the block diagram of the circulation piping system which concerns on Embodiment 2 of this invention. It is an example of the block diagram of the circulation piping system which concerns on Embodiment 3 of this invention. It is an example of the block diagram of the carbon dioxide containing water supply system which concerns on Embodiment 4 of this invention. It is an example of the block diagram of the carbon dioxide containing water supply system which concerns on Embodiment 4 of this invention. It is an example of the block diagram of the carbon dioxide containing water supply system which concerns on Embodiment 5 of this invention. It is an example of the block diagram of the circulation piping system which concerns on Embodiment 2 of this invention.

  Hereinafter, preferred embodiments of a water heater according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. In addition, the size and shape of each constituent member in the drawings are shown in an easy-to-understand manner for explanation, and may differ from the actual size and shape.

Embodiment 1 FIG.
FIG. 1 is an example of a configuration diagram of a circulation piping system according to Embodiment 1 of the present invention. The water heater 100 includes a hot water storage tank 14 that stores hot water (water), a gas vent valve 12 that discharges gas stored in the hot water storage tank, an air heat exchanger 1, and a blower 4 that blows air to the air heat exchanger 1. The compressor 3 for compressing the refrigerant, the water heat exchanger 7, the decompression means 5 for depressurizing the compressed refrigerant, the water pump 11 for feeding water, the bubble injection device 10, and the carbon dioxide supply device 8 And a control unit 24. The water heater 100 is provided with a refrigerant channel 2 and a water channel 6. A hot water supply pipe 13 and a water supply pipe 15 are connected to the hot water storage tank 14. Water is supplied from the outside to the hot water storage tank 14 through the water supply pipe 15, and the hot water stored in the hot water storage tank 14 flows out through the hot water supply pipe 13.

For example, carbon dioxide (CO ₂ ) refrigerant flows in the refrigerant flow path 2. The flow direction of the refrigerant in the refrigerant flow path 2 is the arrow direction in FIG. The refrigerant flow path 2 is provided with an air heat exchanger 1, a compressor 3, a water heat exchanger 7, and a decompression unit 5 in this order. The refrigerant flowing through the refrigerant flow path 2 exchanges heat with the atmosphere supplied to the air heat exchanger 1 when the blower 4 is driven. Thereby, the refrigerant flowing through the air heat exchanger 1 absorbs heat from the atmosphere and rises in temperature, and the atmosphere supplied to the air heat exchanger 1 dissipates heat to the refrigerant and falls in temperature. The refrigerant that has absorbed heat from the atmosphere and has risen in temperature is supplied to the suction side of the compressor 3 and compressed. The refrigerant that has been compressed in the compressor 3 to a high temperature and a high pressure exchanges heat with water flowing through the water flow path 6 through the heat transfer surface of the water heat exchanger 7. The refrigerant that has flowed out of the water heat exchanger 7 in the refrigerant flow path 2 is decompressed by the decompression means 5, becomes a low temperature, and is supplied to the air heat exchanger 1.

  Water supplied by the water pump 11 flows through the water flow path 6. The direction of water flow in the water channel 6 is the direction of the arrow in FIG. The water flow path 6 is provided with a hot water storage tank 14, a water pump 11, a bubble injection device 10, and a water heat exchanger 7 in this order. The hot water storage tank 14 is provided with a gas vent valve 12. Further, the bubble injection device 10 is connected to the carbon dioxide supply device 8. The bubble injection device 10 may be provided on the upstream (inlet) side of the water heat exchanger 7 or may be provided on the upstream side of the water pump 11. The water stored in the hot water storage tank 14 flows into the water heat exchanger 7 through the water flow path 6, and exchanges heat with the refrigerant supplied from the air heat exchanger 1 in the water heat exchanger 7. To rise. The water that has flowed out of the water heat exchanger 7 and increased in temperature returns to the hot water storage tank 14. FIG. 1 shows an example of a countercurrent type water heat exchanger in which the refrigerant and water flow in opposite directions, but the present invention is not limited to this example, and the refrigerant and water flow in parallel. It may be a flow type water heat exchanger. In addition, although an example in which water flows from the vertically downward direction to the vertically upward direction of the water heat exchanger is shown in FIG. 1, the present invention is not limited to this example, and the vertically upward direction of the water heat exchanger. It may be a water heat exchanger in which water flows vertically downward.

  The water heat exchanger 7 heats water by heat exchange between the refrigerant and water. For example, as the water heat exchanger 7, a plate-type heat exchanger, a multi-tube heat exchanger, a double-tube heat exchanger, a microchannel heat exchanger, a boiler heat exchanger, a torsion pipe heat exchanger Can be adopted.

  The bubble injection device 10 is provided on the upstream (inlet) side of the water heat exchanger 7 and has a function of injecting bubbles into water flowing into the water heat exchanger 7. FIG. 3 illustrates a time chart illustrating pulsed bubbles as an example of intermittently injecting bubbles in the present invention. Here, the pulse bubble refers to a bubble in which the amount of bubbles injected into water has a pulse waveform. In the first embodiment, a pulse bubble injection device is used as an example of a bubble injection device 10 that injects pulse bubbles. The pulse bubble injection device will be described later. In addition, the installation position of the pulse bubble injection apparatus mentioned later should just be on the water flow path 6 of the upstream of the water heat exchanger 7, and is not specifically limited.

  FIG. 2 is an example of a configuration diagram illustrating the bubble injection device and the carbon dioxide supply device of the circulation piping system according to Embodiment 1 of the present invention. The pulse bubble injection device 10 b includes a gas-liquid mixing unit 23, a negative pressure forming unit 22, and a first opening / closing valve 9. In the pulse bubble injection device 10b, the gas-liquid mixing unit 23, the negative pressure forming unit 22, and the first on-off valve 9 are connected in the order of the gas-liquid mixing unit 23, the negative pressure forming unit 22, and the first on-off valve 9. That is, the negative pressure forming unit 22 is connected to the gas-liquid mixing unit 23, the first on-off valve 9 is connected to the negative pressure forming unit 22, and a negative pressure is formed between the gas-liquid mixing unit 23 and the first on-off valve 9. It is connected so that part 22 may intervene. The first opening / closing valve 9 is connected to the carbon dioxide supply device 8 and is provided between the negative pressure forming unit 22 and the carbon dioxide supply device 8.

  FIG. 6 is an example showing the bubble injection device of the circulation piping system according to Embodiment 1 of the present invention. 6 (a) shows a gas introduction tube, FIG. 6 (b) shows a diffuser tube, a diffuser bulb, and a porous nozzle, FIG. 6 (c) shows a spray nozzle, and FIG. 6 (d) shows an ejector. FIG. 6 (e) shows pressurized supply. In FIGS. 6A to 6E, solid arrows indicate the direction of water flow, and broken arrows indicate the direction of gas flow. In addition, about FIG.6 (b), each of a diffuser tube, a diffuser ball | bowl, and a porous nozzle differs. The gas-liquid mixing unit 23 has a gas introduction pipe (see FIG. 6A) that can introduce gas in addition to the flow path that flows through the water flow path 6, and supplies gas to the water that flows into the water heat exchanger 7. In addition, it has a function of mixing bubbles with water. Examples of such a function include a gas introduction tube for flowing a gas into a liquid, an air diffusion tube for dispersing and introducing a gas into a liquid, an air diffuser and a porous nozzle, and a mixture of gas and liquid for spraying. A spray nozzle and an ejector that creates a mixed phase flow of gas and liquid can be used (see FIGS. 6A to 6D). Next, an example of the present invention will be described from an example in which an ejector is used for the gas-liquid mixing unit 23. In the first embodiment, an example in which a gas containing carbon dioxide is sucked by an ejector and introduced into the gas-liquid mixing unit 23 will be described. However, the present invention is not limited to this example. A gas containing carbon dioxide may be pushed in and introduced (see FIG. 6E).

  The ejector is provided with a narrowed portion on the flow path flowing through the water flow path 6, and the flow velocity of the water flowing through the water flow path 6 is increased at this portion. At this time, due to a decompression phenomenon (usually called Bernoulli's theorem) that occurs in the constricted portion, gas can be sucked from the gas introduction tube, and bubbles can be injected into the water flowing through the water flow path 6. In the first embodiment, the example in which the direction of the water flowing through the ejector is arranged in the horizontal direction is shown, but the present invention is not limited to this example, and the water may flow in the vertical direction. By making the primary side where water flows into the ejector vertically upward and the secondary side where water flows out from the ejector vertically downward, the pressure difference between the primary side and the secondary side can be increased, and the constricted part It is possible to increase the amount of gas sucked from the gas introduction pipe by increasing the decompression phenomenon generated in the above. That is, the amount of gas suction obtained with the same power is large, and it is possible to increase the operation efficiency (energy saving).

  As shown in FIG. 2, the gas-liquid mixing unit 23 is connected to the carbon dioxide supply device 8 via the negative pressure forming unit 22 and the first on-off valve 9. For this reason, the gas sucked in the gas-liquid mixing unit 23 is a gas having a high carbon dioxide concentration supplied from the carbon dioxide supply device 8 (details will be described later). Thus, bubbles having a high carbon dioxide concentration can be injected into the water flowing through the water flow path 6. A check valve may be provided between the gas-liquid mixing unit 23 and the negative pressure forming unit 22 so that the gas flow direction changes from the negative pressure forming unit 22 to the gas-liquid mixing unit 23.

  The negative pressure forming part 22 provided between the gas-liquid mixing part 23 and the first on-off valve 9 has a constant volume space.

  The first on-off valve 9 has a function of communicating or blocking the negative pressure forming unit 22 and the carbon dioxide supply device 8 by opening and closing the valve. As what has such a function, a solenoid valve can be used, for example. The first opening / closing valve 9 is connected to the control unit 24, and the opening / closing of the valve can be controlled by the control unit 24.

  The carbon dioxide supply device 8 includes a carbon dioxide concentrating unit 18, an intake pipe 21, a second on-off valve 19, a blower pump 20, a discharge pipe 16, and a third on-off valve 17. The carbon dioxide supply device 8 is connected to the pulse bubble injection device 10b and has a function of supplying a gas having a high carbon dioxide concentration to the pulse bubble injection device 10b. For this reason, the carbon dioxide supply device 8 and the pulse bubble injection device 10 b can inject bubbles having a high carbon dioxide concentration into the water flowing through the water flow path 6.

  The carbon dioxide concentrating unit 18 is provided with an adsorbent that adsorbs carbon dioxide therein, and has a function of concentrating carbon dioxide by adsorption. As an adsorbent having such a function, for example, zeolite, molecular sieve, alumina, activated carbon, solid amine and the like can be used. A second open / close valve 19 and a blower pump 20 are connected to the carbon dioxide concentrating portion 18 via an intake pipe 21, and a third open / close valve 17 is connected via a discharge pipe 16. The second on-off valve 19 and the blower pump 20 need only be provided in the middle of the intake pipe 21, but are arranged so that the second on-off valve 19 is interposed between the carbon dioxide concentrating unit 18 and the blower pump 20. More preferably.

  One end of the intake pipe 21 is connected to the carbon dioxide concentrating unit 18, and the other end is open to the atmosphere. Further, as described above, the second opening / closing valve 19 and the blower pump 20 are provided in the middle of the intake pipe 21. The intake pipe 21 has a function of passing air sent from the atmosphere to the carbon dioxide concentrating unit 18 by the blower pump 20.

  The second opening / closing valve 19 is provided in the middle of the intake pipe 21 and has a function of communicating or blocking the carbon dioxide concentrating unit 18 and the atmosphere by opening and closing the valve. As what has such a function, a solenoid valve can be used for the 2nd on-off valve 19, for example. The second opening / closing valve 19 is connected to the control unit 24, and the opening / closing of the valve can be controlled by the control unit 24. In addition, the 2nd on-off valve 19 should just be provided in the middle of the intake pipe 21, and is not limited to the position (between the carbon dioxide concentration part 18 and the ventilation pump 20) shown in figure.

  One end of the discharge pipe 16 is connected to the carbon dioxide concentrating unit 18, and the other end is open to the atmosphere. The discharge pipe 16 has a function of discharging the air sent to the carbon dioxide concentrating unit 18 by the blower pump 20 to the atmosphere.

  The third on-off valve 17 is provided in the middle of the discharge pipe 16 and has a function of opening and closing to connect or block the carbon dioxide concentrating unit 18 and the atmosphere. As what has such a function, a solenoid valve can be used for the 3rd on-off valve 17, for example. The third on-off valve 17 is connected to the control unit 24, and the control unit 24 can control the opening / closing of the valve.

  The blower pump 20 is provided in the middle of the intake pipe 21, and has a function of flowing air in the order of the intake pipe 21, the carbon dioxide concentrating unit 18, and the discharge pipe 16. In addition, you may provide the connection position of the ventilation pump 20 in the middle of the exhaust pipe 16 instead of the middle of the intake pipe 21 mentioned above. The blower pump 20 is connected to the control unit 24, and the control unit 24 can control power ON / OFF.

  The carbon dioxide concentrating unit 18 and the intake pipe 21 are connected at a position close to the first on-off valve 9 (shown in the vertical downward direction in the figure), and the carbon dioxide concentrating unit 18 and the exhaust pipe 16 are far from the first on-off valve 9. They are connected at a position (shown in the vertical direction in the figure). That is, the connection position between the carbon dioxide concentrating part 18 and the intake pipe 21 is closer to the first on-off valve 9 than the connection position between the carbon dioxide concentrating part 18 and the exhaust pipe 16.

  As described above, the first on-off valve 9, the second on-off valve 19, the third on-off valve 17, and the blower pump 20 are each connected to the control unit 24. The controller 24 controls the opening / closing of the first opening / closing valve 9, the second opening / closing valve 19, the third opening / closing valve 17, and the blower pump 20 so as to operate in conjunction with each other.

  4 and 5 are examples of a configuration diagram illustrating an operation state of the circulation piping system according to the first embodiment of the present invention. 4 and 5, the solid line arrows indicate the water flow direction, and the broken line arrows indicate the gas flow direction. When the first on-off valve 9 is closed under the control of the control unit 24, the second on-off valve 19 and the third on-off valve 17 are both open, and the blower pump 20 is turned on (hereinafter referred to as the valve). Operating state A). FIG. 4 shows the valve operating state A. In FIG. 4, the open / close state of each open / close valve is indicated by o (open) and c (closed) attached to the back of the reference numeral. At this time, the atmosphere and the carbon dioxide enrichment unit 18 are in communication with each other, and air flows from the atmosphere to the carbon dioxide enrichment unit 18. On the other hand, when the first on-off valve 9 is open, both the second on-off valve 19 and the third on-off valve 17 are closed, and the blower pump 20 is turned off (hereinafter referred to as valve operation state B). FIG. 5 shows the valve operating state B. In FIG. 5, the open / close state of each open / close valve is indicated by o (open) and c (closed) attached to the back of the reference numeral. At this time, since the atmosphere and the carbon dioxide concentrating unit 18 are blocked, and the blower pump 20 is in the OFF state, there is no air flow from the atmosphere to the carbon dioxide concentrating unit 18.

  When the valve operating state A is reached, the gas in the negative pressure forming unit 22 is sucked due to the depressurization phenomenon of the gas-liquid mixing unit 23. If this state is maintained, the gas in the negative pressure forming part 22 decreases, so the pressure in the negative pressure forming part 22 gradually decreases to a negative pressure state (a state below atmospheric pressure). At this time, the difference in internal pressure between the carbon dioxide supply device 8 and the negative pressure forming unit 22 is large. When the first on-off valve 9 is opened in this state, that is, when the valve operating state A is switched to the valve operating state B, the carbon dioxide concentrating unit 18 and the pulse bubble injection device 10b communicate with each other. A large pressure difference is instantaneously obtained between the negative pressure forming unit 22 and the negative pressure forming unit 22. As a result, a gas having a high carbon dioxide concentration can be supplied all at once from the carbon dioxide concentrating unit 18 (carbon dioxide supply device 8) to the pulse bubble injection device 10b (negative pressure forming unit 22). The gas supplied to the negative pressure forming unit 22 is instantaneously sucked by the depressurization phenomenon of the gas-liquid mixing unit 23. From this, by opening the first on-off valve 9 instantaneously, pulse bubbles can be injected into the water flowing through the water flow path 6 with a large pressure difference obtained instantaneously.

  FIG. 3 is a time chart for explaining pulse bubbles in the first embodiment of the present invention. The vertical axis represents the amount of bubble injection, and the horizontal axis represents the operation time of the water heater 100. As described above, after continuing the valve operation state A, by switching to the valve operation state B, a gas having a high carbon dioxide concentration is supplied from the carbon dioxide supply device 8 to the negative pressure forming unit 22 at once. Since it is sucked into the gas-liquid mixing part 23, the slope a of the pulse waveform of the amount of bubble injection into the water channel 6 can be made steep. Furthermore, in the first embodiment, the control unit 24 sets the operation time t1 in the valve operation state A to 1 to 30 minutes, for example, and sets the operation time t2 in the valve operation state B to, for example, about 5 to 20 seconds. The one on-off valve 9, the second on-off valve 19, the third on-off valve 17 and the blower pump 20 are controlled. The ratio (t1 / t2) of the operation time between the valve operation state A and the valve operation state B is, for example, 3 <(t1 / t2) <360, preferably 5 <(t1 / t2) <180, more preferably 10 <. Control is performed by the control unit 24 so that (t1 / t2) <40.

  That is, the control unit 24 performs control so that the duration of the valve operating state B is 5 to 20 seconds, and the duration of the valve operating state A is longer than three times the duration of the valve operating state B and shorter than 360 times. Preferably, the duration of the valve operating state A is controlled to be longer than 5 times and shorter than 180 times the duration of the valve operating state B, more preferably the duration of the valve operating state A is the valve operating state. It is controlled to be longer than 10 times and shorter than 40 times the duration of B. By operating the operation state of the valve in this way, the change in the injection amount of bubbles with a high carbon dioxide concentration into the water flow path 6 becomes a pulse waveform as shown in FIG. Can be injected into the channel 6. As a result, the control unit 24 can intermittently inject bubbles with a high carbon dioxide concentration into the water flow path 6.

When pulse bubbles having a high carbon dioxide concentration are injected into the water flowing through the water flow path 6, a part of the carbon dioxide, which is a bubble component, dissolves in the water. Carbon dioxide dissolved in water advances the equilibrium of the above-described formula (1) to the right, and dissolves calcium carbonate (CaCO ₃ ), which is a main factor of scale, as calcium hydrogen carbonate (Ca (HCO ₃ ) ₂ ). That is, the effect of suppressing the precipitation of scale is obtained.

  Further, since a large pressure difference obtained instantaneously between the carbon dioxide supply device 8 and the negative pressure forming unit 22 can be used, a large pulse bubble having a bubble diameter of 1 mm or more can be injected into the water flow path 6. By injecting a pulse bubble with a large bubble diameter, if a small bubble with a bubble diameter of 100 μm or less, called a microbubble, is attached to the heat transfer surface of the heat exchanger, the pulse bubble with a large bubble diameter and the heat transfer surface It is possible to obtain an effect that the attached microbubbles are united and peeled off from the heat transfer surface. That is, a reduction in heat transfer area due to adhesion of microbubbles can be suppressed, and an effect of suppressing a decrease in heat exchange efficiency can be obtained. The inventors of the present application observed a phenomenon in which a pulse bubble having a large bubble diameter merged with a small bubble of 100 μm or less adhering to the heat transfer surface of the heat exchanger and peeled off from the heat transfer surface.

Here, the operation of the water heater 100 will be specifically described. Under the control of the control unit 24, the water heater 100 is operated in the valve operation state A, that is, the first on-off valve 9 is closed, the second on-off valve 19 and the third on-off valve 17 are opened, and the blower pump 20 is on. Started. In the valve operation state A, the flow rate of water flowing through the water flow path 6 of the water heater 100 was set to about 18 to 20 L / min. As an example, the volume space (volume) of the negative pressure forming unit 22 is about 100 cm ³ , the volume of the carbon dioxide concentrating unit 18 is about 150 cm ³ , and the carbon dioxide concentrating unit 18 is filled with about 100 g of zeolite as a carbon dioxide adsorbent. Drove. When the operation was started, a depressurization phenomenon of the gas-liquid mixing unit 23 occurred due to the flow velocity of the water flowing through the water channel 6, and the gas remaining in the negative pressure forming unit 22 in the initial state was sucked and injected into the water channel 6. The water gradually enters a steady state and does not contain gas (bubbles) and flows through the water flow path 6. The gauge pressure of the negative pressure forming part 22 was a negative pressure. This state was continued for 5 minutes (t1), and the water flowing through the water flow path 6 was heated by the water heat exchanger 7. At this time, air was circulated through the carbon dioxide concentrating unit 18 by the blower pump 20 to adsorb carbon dioxide to the adsorbent in the carbon dioxide concentrating unit 18.

  Subsequently, the valve operation state B was switched under the control of the control unit 24. At this time, pulse bubbles having a high carbon dioxide concentration were injected into the water flow path 6 at a stretch due to the pressure difference between the carbon dioxide concentrating unit 18 and the negative pressure forming unit 22. This state was continued for 5 seconds (t2).

  Thereafter, the valve operation state A and the valve operation state B were repeated, and the water heater 100 was operated while injecting pulsed bubbles into the water flowing through the water flow path 6. As a result, the decrease in COP (Coefficient of Performance), which is one index representing the heat exchange efficiency, was 5% or less. Thus, the amount of pulse bubbles flowing into the heat exchanger can be controlled, and the effect of suppressing the decrease in heat exchange efficiency was obtained while the effect of suppressing the precipitation of scale was obtained.

  As described above, according to the first embodiment, when the first on-off valve 9 is opened, a large pressure difference that is obtained instantaneously causes the carbon dioxide concentration unit 18 of the carbon dioxide supply device 8 to change the bubble injection device 10. A gas having a high carbon dioxide concentration can be supplied to the negative pressure forming unit 22 at once. And by controlling the valve operation state A and the valve operation state B as described above, the amount of high bubbles of carbon dioxide flowing into the heat exchanger is controlled, and the decrease in heat exchange efficiency is suppressed. An adhesion suppressing effect can be obtained.

  Generally, when heat is exchanged between refrigerant and water in a water heat exchanger, the heat from the refrigerant is transferred to water as a heat medium to warm the water. When air bubbles (gas) are mixed into the water, which is the heat medium, the heat transfer area decreases depending on the volume of the mixed air bubbles, so that the heat exchange efficiency decreases. For this reason, when air bubbles are mixed in water, which is a heat medium, in a steady (continuous) manner, the heat exchange efficiency is significantly reduced. In addition, the difference in heat capacity between water and gas (bubbles) is considered to be one of the causes for the decrease in heat exchange efficiency. Furthermore, the inventors of the present application show that when small bubbles (100 μm or less) called microbubbles flow into the heat exchanger, the microbubbles easily adhere to the heat transfer surface of the heat exchanger. Was observed. The microbubbles adhering to the heat transfer surface directly reduce the heat transfer area effective for heat exchange, which contributes to a decrease in heat exchange efficiency.

  In the water heater 100 provided with the bubble injection device 10 according to the first embodiment, since the bubble to be injected is the pulse bubble described above, the bubble can flow intermittently into the water flow path 6, and the water heat exchanger 7. It is possible to control the amount of bubbles flowing into the. From this, the effect which suppresses the fall of heat exchange efficiency can be acquired, acquiring the suppression effect of scale adhesion by inject | pouring a bubble to the water heat exchanger 7. FIG.

  Furthermore, since a large pressure difference obtained instantaneously can be used, a large pulse bubble having a bubble diameter of 1 mm or more can be injected into the water channel 6. Since it is possible to inject pulse bubbles having a large bubble diameter, even if the above-described microbubbles are attached to the heat transfer surface of the water heat exchanger 7, the microbubbles attached to the pulse bubble having a large bubble diameter and the heat transfer surface are attached. Therefore, the effect of peeling off the microvalve from the heat transfer surface can be obtained. That is, according to this Embodiment 1, the reduction of the heat transfer area by adhesion of microbubbles can be suppressed, and the effect which suppresses the fall of heat exchange efficiency can be heightened more.

  Furthermore, according to Embodiment 1, since carbon dioxide can be supplied without using a gas cylinder, there are few restrictions on the place of use, and there is an effect that maintenance such as cylinder replacement is not necessary. Although the carbon dioxide concentration in the atmosphere is about 0.04%, the carbon dioxide concentration unit 18 can supply a gas having a high carbon dioxide concentration of about 50 to 96% to the water channel 6.

The connection position between the carbon dioxide concentrating unit 18 and the intake pipe 21 and the connection position between the carbon dioxide concentrating unit 18 and the exhaust pipe 16 are not particularly limited. However, as in the first embodiment, the carbon dioxide concentrating unit 18 is connected. More preferably, the connection position between the intake pipe 21 and the intake pipe 21 is provided closer to the first on-off valve 9 than the connection position between the carbon dioxide concentrating portion 18 and the exhaust pipe 16. By providing the intake pipe 21 and the exhaust pipe 16 in such a positional relationship, the air (atmosphere) flowing through the carbon dioxide concentrating unit 18 can flow from the side closer to the first on-off valve 9 to the side farther away. As a result, carbon dioxide adsorbed by the adsorbent provided inside the carbon dioxide concentrating unit 18 can be adsorbed from a position close to the first on-off valve 9. In other words, the amount of carbon dioxide adsorbed by the adsorbent located near the first on-off valve 9 is always greater than or equal to the amount of carbon dioxide adsorbed by the adsorbent located far from the first on-off valve 9. Can be. For this reason, in the valve operation state B, since the carbon dioxide adsorbed by the adsorbent close to the first on-off valve 9 is sucked (desorbed), bubbles with a high carbon dioxide concentration are quickly converted into water flowing through the water flow path 6. Can supply. For this reason, carbon dioxide can be dissolved more quickly into the water flowing through the water flow path 6. Therefore, the equilibrium of the above-described equation (1) can be advanced to the right, and calcium carbonate (CaCO ₃ ), which is the main factor of the scale, can be dissolved in calcium bicarbonate (Ca (HCO ₃ ) ₂ ) more quickly. That is, the effect of suppressing the precipitation of scale is higher.

  The blower pump 20 can also be a pump with high pressure supply. When the first on-off valve 9 is closed, the open / close state of each valve at this time is such that the second on-off valve 19 is open and the third on-off valve 17 is half open (between fully open and fully closed). Can be determined arbitrarily). That is, when the blower pump 20 is turned on and air is allowed to flow to the carbon dioxide concentrating unit 18, the pressure flowing through the exhaust pipe 16 may be made smaller than the pressure flowing through the intake pipe 21. At this time, the internal pressure of the carbon dioxide concentrating unit 18 can be increased to atmospheric pressure or higher. By using a pump having a high pressure in this way, the internal pressure of the carbon dioxide concentrating unit 18 can be increased and the pressure difference with the negative pressure forming unit 22 can be further increased. Subsequently, by setting the above-described valve operation state B (the first on-off valve 9 is open and the second on-off valve 19 and the third on-off valve 17 are both closed), Then, it is possible to inject a pulse bubble having a steeper pulse waveform slope a. The effects obtained by flowing the pulse bubbles into the water flowing through the water flow path 6 are as described above.

  Furthermore, the generation rate of large pulse bubbles having a bubble diameter of 1 mm or more can be increased. For this reason, even if the above-described microbubbles adhere to the heat transfer surface of the water heat exchanger 7, the microbubbles are heated by combining the large bubble bubble and the microbubble attached to the heat transfer surface. The effect of peeling off from the transmission surface can be further enhanced. That is, the reduction of the heat transfer surface due to the adhesion of microbubbles can be suppressed, and the effect of suppressing the decrease in heat exchange rate can be further enhanced.

  In the present specification, an example of a heat pump water heater is mainly described, but an air conditioner including a water heat exchanger (that is, a refrigeration cycle including a water circuit and a refrigerant circuit connected to the water heat exchanger). Needless to say, the present invention can be applied to a circulation piping system such as an apparatus. Moreover, even if it is the structure of only the pulse bubble injection apparatus 10b, without providing the carbon dioxide supply apparatus 8, a pulse bubble can be inject | poured and the heat exchange efficiency falls, obtaining the inhibitory effect of the scale adhesion of this invention. Needless to say, the effect of suppressing the above can be obtained.

Embodiment 2. FIG.
FIG. 7 is an example of a configuration diagram of the circulation piping system according to the second embodiment. In addition, since the basic structure of the circulation piping system which concerns on this Embodiment 2 is the same as the circulation piping system which concerns on Embodiment 1, only a different point is demonstrated. 7, an example of the circulation piping system according to the second embodiment is connected to the carbon dioxide concentrating unit 18 in the configuration of the circulation piping system according to the first embodiment, and detects the temperature of the carbon dioxide concentrating unit 18. A temperature detection unit 25 is provided, and the temperature detection unit 25 is connected to the control unit 24. In the circulation piping system having the above-described configuration, by detecting the temperature of the carbon dioxide concentrating unit 18, the amount of adsorbent that adsorbs carbon dioxide provided in the carbon dioxide concentrating unit 18 is estimated, It is possible to efficiently switch between the valve operation state A and the valve operation state B.

  An enthalpy change occurs when the adsorbent adsorbs and desorbs carbon dioxide. General adsorption is exothermic and desorption is endothermic. That is, the amount of carbon dioxide adsorbed by the adsorbent can be estimated by detecting the temperature of the carbon dioxide concentrating unit 18 in the temperature detecting unit 25. In the valve operation state A, carbon dioxide is adsorbed in the adsorbent in the carbon dioxide concentrating unit 18, and the temperature of the carbon dioxide concentrating unit 18 rises due to heat of adsorption. The temperature rise rate at this time is considered to depend on the adsorption rate (adsorption amount) of carbon dioxide, and as the adsorbent coverage increases and approaches the adsorption saturation amount, the temperature rise rate decreases, and when the adsorbent is saturated, the temperature rises (If the valve operating state A is continued in a state where the adsorbent is saturated, it is considered that the adsorption rate and the desorption rate become equal, and no further adsorption occurs, so the temperature gradually decreases due to natural cooling). When the control unit 24 calculates the temperature increase rate from the temperature detected by the temperature detection unit 25 and switches from the valve operation state A to the valve operation state B during the period from when the temperature increase rate starts to decrease to zero. Good.

  On the other hand, in the valve operation state B, carbon dioxide is desorbed from the adsorbent that has adsorbed carbon dioxide in the carbon dioxide concentrating unit 18, and the temperature of the carbon dioxide concentrating unit 18 is decreased by the desorption heat. The temperature decrease rate at this time is considered to depend on the desorption rate (desorption amount) of carbon dioxide, and as the adsorbed carbon dioxide desorbs and approaches zero, the temperature decrease rate decreases and eventually becomes zero. When the control unit 24 calculates the temperature decrease rate from the temperature detected by the temperature detection unit 25 and switches from the valve operation state B to the valve operation state A during the period from when the temperature decrease rate starts to decrease to zero, Good.

  By the above operation method, the adsorption process and the desorption process can be performed without waste, and the valve operation state can be switched efficiently. Needless to say, the time of the valve operation state A and the valve operation state B can be arbitrarily designed according to the filling amount of the adsorbent, the volume of the carbon dioxide concentrating unit 18, and the volume space of the negative pressure forming unit 22.

  FIG. 12 is an example of a configuration diagram of a circulation piping system according to Embodiment 2 of the present invention. As shown in FIG. 12, as the temperature detection unit, the temperature detection unit 25 a connected to the inside filled with the adsorbent in the carbon dioxide concentration unit 18 and in the vicinity of the discharge pipe 16 side, and the carbon dioxide concentration unit 18 You may connect two with the temperature detection part 25b connected to the inside filled with adsorption agent, and the vicinity of the intake pipe 21 side. For example, in the example of the second embodiment, the temperature detection unit 25a is connected to the vertically upper adsorbent, and the temperature detection unit 25b is connected to the vertically lower adsorbent. By connecting the temperature detectors 25a and 25b to such positions, the temperature at the downstream of the adsorbent in the vicinity of the discharge pipe 16 can be detected directly, so the saturation state of the adsorbent can be estimated more efficiently. It becomes possible. As described in Embodiment 1, the amount of carbon dioxide adsorbed on the adsorbent located near the first on-off valve 9 is always carbon dioxide adsorbed on the adsorbent located far from the first on-off valve 9. When the amount is greater than or equal to the amount, the heat of adsorption is generated from the adsorbent at a position close to the first on-off valve 9, and the position is farther from the first on-off valve 9 as the adsorption saturation amount is approached. Heat of adsorption is generated in the adsorbent. For this reason, it is only necessary to detect the heat of adsorption at the downstream stage of the adsorbent in the temperature detection unit 25a, and the calculation at the control unit 24 becomes unnecessary, and the valve operation state A is switched to the valve operation state B when the temperature rise is detected. It becomes possible.

  On the other hand, since the temperature detection unit 25b can directly detect the temperature in the preceding stage of the adsorbent, it is possible to more efficiently estimate the desorption state of carbon dioxide in the adsorbent. As described in Embodiment 1, in the valve operation state B, the carbon dioxide adsorbed by the adsorbent close to the first on-off valve 9 (in this case, the pre-adsorbent stage) is sucked (desorbed). If only the heat of desorption at the upstream of the adsorbent is detected, there is no need for calculation by the control unit 24, and it is possible to switch from the valve operating state B to the valve operating state A when the temperature drop is detected.

  Note that only the temperature detection unit 25a is connected to switch from the valve operating state A to the valve operating state B, and the switching from the valve operating state B to the valve operating state A is performed as described in the first embodiment. You may control by time. That is, the controller 24 controls the first on-off valve 9, the second on-off valve 19, the third on-off valve 17, and the blower pump 20 so that the operation time t2 is, for example, about 5 to 20 seconds. To valve operating state A. The operation method as described above makes it possible to switch the valve operating state efficiently in the adsorption process and without requiring calculation in the control unit 24. Needless to say, the time for the valve operating state A can be arbitrarily designed according to the amount of adsorbent filled, the capacity of the carbon dioxide concentrating unit 18 and the volume space of the negative pressure forming unit 22.

Embodiment 3 FIG.
FIG. 8 is an example of a configuration diagram of the circulation piping system according to the third embodiment. In addition, since the basic structure of the circulation piping system which concerns on this Embodiment 3 is the same as the circulation piping system which concerns on Embodiment 1 and Embodiment 2, only a different point is demonstrated. In FIG. 8, an example of the circulation piping system according to the third embodiment includes a heating unit 26 that heats the carbon dioxide concentrating unit 18 in the configuration of the circulation piping system according to the first and second embodiments. The heating unit 26 is connected to the control unit 24.

  In the circulation piping system having the above configuration, the carbon dioxide concentrating unit 18 can be heated in the valve operation state B, and the desorption of carbon dioxide in the carbon dioxide concentrating unit 18 can be promoted. Become. As described in the second embodiment, when carbon dioxide is desorbed, the temperature of the adsorbent decreases. Due to this temperature decrease, the desorption rate of carbon dioxide decreases. In the third embodiment, when the valve operating state B, the heating unit 26 is used to heat the carbon dioxide concentrating unit 18 so that a decrease in the desorption rate can be suppressed, and a pulse waveform is generated in the water flowing through the water channel 6. It is possible to inject a pulse bubble having a steeper slope a. The effect obtained by flowing the pulse bubbles into the water flowing through the water flow path 6 is as described in the first embodiment.

Embodiment 4 FIG.
FIG. 9 is an example of a configuration diagram of the carbon dioxide-containing water supply system according to the fourth embodiment. The basic configuration of the carbon dioxide supply system according to the fourth embodiment is the same as that of the circulation piping system according to the first embodiment, the second embodiment, and the third embodiment, and therefore only the differences will be described. . In FIG. 9, an example of the carbon dioxide supply system according to the fourth embodiment is stored in the hot water storage tank 14 in the configuration of the circulation piping system according to the first embodiment, the second embodiment, and the third embodiment ( The hot water supply pipe 13 that flows out hot water (stored hot water) to the outside includes a bubble injection device 10, a carbon dioxide supply device 8, a control unit 24, and a dilution water pipe 27.

  Normally, the hot water stored in the hot water tank is operated at a temperature of about 40-90 ° C. Before it flows out, it is mixed with hot water and tap water so that it reaches the temperature required at the point of use. Outflow (supply) to an external use point. Use points include, for example, bathtubs, showers, washrooms, kitchens, floor heating, and the like. According to the fourth embodiment, carbon dioxide can be supplied to hot water (supply water) supplied to the use point.

  As described in the first embodiment, the bubble injection device 10 includes, for example, a gas introduction tube for flowing a gas into the liquid, an air diffusion tube for introducing the gas by dispersing the gas into the liquid, an air diffusion ball, a porous nozzle, a gas and a liquid A spray nozzle that mixes and sprays, and an ejector that creates a mixed phase flow of gas and liquid. In the fourth embodiment, an example of the present invention will be described from an example in which an ejector is used for the gas-liquid mixing unit 23.

  The bubble injection device 10 only needs to be provided on the hot water supply pipe 13 and may be upstream or downstream of the junction with the dilution water pipe 27. According to Henry's Law, the effect of the present invention is higher because the amount of carbon dioxide (gas) dissolved is greater when it is provided on the downstream side with a lower water temperature than on the upstream side with a higher water temperature. In addition, it is more convenient to install near the outflow outlets such as bathtubs, showers, washrooms, kitchens, floor heating, etc., because the operating state of the carbon dioxide supply system can be selected for each use point. high. Needless to say, the operating state (operation ON / OFF) of the carbon dioxide supply system may be selected using an external operation panel (not shown) of the carbon dioxide supply system.

  FIG. 10 is an example of a configuration diagram of a carbon dioxide-containing water supply system according to Embodiment 4 of the present invention. As shown in FIG. 10, the bubble injection device 10 may be provided on the dilution water pipe 27. Since the water temperature of the tap water flowing through the dilution water pipe 27 is lower than the water temperature of the water flowing through the hot water supply pipe 13, more carbon dioxide (gas) can be dissolved according to Henry's law. For this reason, the effect of suppressing the adhesion of scale described in the first embodiment is higher.

  In the carbon dioxide-containing water supply system of the fourth embodiment, the configurations and operation methods of the bubble injection device 10, the carbon dioxide supply device 8, and the control unit 24 are the first embodiment, the second embodiment, and the third embodiment. It goes without saying that it should be the same.

  In the carbon dioxide supply system having the configuration as described above, since warm water containing carbon dioxide can be supplied, in addition to the scale adhesion suppression effect, the effect by promoting blood flow as obtained with carbonated spring, the direct effect on the skin, etc. It will be possible to improve health. Specifically, shoulder stiffness, low back pain, recovery from fatigue, coldness, neuralgia, rheumatism, hemorrhoids, moistness, roughness, cracks, redheads, acne, acne, etc. are considered possible. In addition, when used as bath water in a bathtub, it is considered that comfort during bathing such as a warm bath effect is improved.

Embodiment 5. FIG.
FIG. 11 is an example of a configuration diagram of the carbon dioxide-containing water supply system according to the fifth embodiment. The basic configuration of the carbon dioxide supply system according to the fifth embodiment is the same as the circulation piping system according to the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment. Only the differences will be described. In FIG. 11, an example of the carbon dioxide supply system according to the fifth embodiment is a heating pipe in the configuration of the circulation piping system according to the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment. 28, a reheating heat exchanger 29, circulation pumps 30 and 31, a recirculation circulation pipe 32, and a bathtub 33.

  In the fifth embodiment, water is converted into hot water (hot water) by the heat supplied by the cooling / heating cycle of the circulation piping system, the hot water boiling function for storing hot water in the hot water storage tank 14, the hot water supply function for supplying hot water to the bathtub 33, It has a chasing function for chasing the bath water of the bathtub 33. The hot water storage tank 14 is provided with a heating pipe 28 for supplying hot water to the reheating heat exchanger 29 and a circulation pump 30 for circulating the hot water. A recirculation circulation pipe 32 for reheating is connected to a reheating heat exchanger 29. A bubble injection device 10 for bubble injection is attached to the circulation pipe 32 for reheating.

  The attachment position of the bubble injection device 10 is not limited to this example, and the effect of the fifth embodiment can be obtained regardless of whether it is provided on the upstream side or the downstream side of the reheating heat exchanger 29. . In addition, since it is possible to reduce the pressure on the secondary side of the bubble injection device 10 when the attachment position of the bubble injection device 10 is provided on the downstream side of the reheating heat exchanger 29, the bubbles can be injected more efficiently. Is possible. In other words, more bubbles can be injected with the same power (energy saving operation).

  In order to raise the temperature of the bath water when the bath water in the bathtub cools and becomes unsuitable for bathing, the bath water heater is usually provided with a reheating function. Here, the bath water is heated with a heat exchanger for reheating.

  Next, the operation of injecting bubbles containing carbon dioxide into the reheating heat exchanger 29 and the recirculation circulation pipe 32 connected to the reheating heat exchanger 29 will be described. When reheating the bath water in the bathtub 33, hot water is led from the hot water storage tank 14 to the reheating heat exchanger 29 through the heating pipe 28 by the circulation pump 30. On the other hand, the bath water in the bathtub 33 is sent to the reheating heat exchanger 29 through the recirculation circulation pipe 32 by the circulation pump 31. In the reheating heat exchanger 29, the hot water is deprived of heat by the bath water by the heat exchanger between the hot water and the bath water in the hot water storage tank 14, becomes low temperature water, and is returned to the hot water storage tank through the heating pipe 28. . On the other hand, the bath water is heated to a higher temperature and returned to the bathtub 33 through the recirculation circulation pipe 32. By repeating this, the temperature of the bathed water becomes a hot water temperature suitable for bathing.

  In the fifth embodiment, an example of a countercurrent reheating heat exchanger that flows in a direction in which hot water and bath water flow in opposite directions is shown in FIG. 11, but the present invention is not limited to this example. Alternatively, it may be a co-current reheating heat exchanger in which hot water and bath water flow in parallel. Moreover, although the example in which the bath water flows from the vertically downward direction to the vertically upward direction of the reheating heat exchanger is shown in FIG. 11, the present invention is not limited to this example, and reheating heat exchange is performed. It may be a reheating heat exchanger in which the bath water flows from the vertically upward direction to the vertically downward direction of the vessel.

  The reheating heat exchanger 29 heats water by heat exchange between warm water and bath water. For example, as the heat exchanger 29 for reheating, a plate heat exchanger, a multi-tube heat exchanger, a double tube heat exchanger, a microchannel heat exchanger, a boiler heat exchanger, a twisted tube heat exchanger Can be used. At this time, bubbles including carbon dioxide are injected by the bubble injection device 10 provided in the recirculation circulation pipe 32, and pulsed bubbles can be injected into the bathtub 33. The operations of the bubble injection device 10, the carbon dioxide supply device 8, and the control unit 24 may be operated as described in the first embodiment, the second embodiment, and the third embodiment.

  In the carbon dioxide supply system having the above-described configuration, since hot water containing carbon dioxide can be supplied to the bathtub 33, health effects such as the effects of blood flow promotion and direct effects on the skin as obtained with carbonated springs can be obtained. It becomes possible to do well. Specifically, shoulder stiffness, low back pain, recovery from fatigue, coldness, neuralgia, rheumatism, hemorrhoids, moistness, roughness, cracks, redheads, acne, acne, etc. are considered possible. Moreover, it is thought that the comfort at the time of bathing, such as a warm bath effect, also improves. In the fifth embodiment, pulsed bubbles containing carbon dioxide can be supplied to the bathtub 33 by using the circulation pipe 32 for reheating during bathing, and thus the above-described effect is higher. Moreover, since pulsed bubbles containing carbon dioxide can be supplied intermittently (rhythm supply), it is considered possible to stimulate the bather's sensitivity and improve the comfort during bathing.

  DESCRIPTION OF SYMBOLS 1 Air heat exchanger, 2 Refrigerant flow path, 3 Compressor, 4 Blower, 5 Pressure reduction means, 6 Water flow path, 7 Water heat exchanger, 8 Carbon dioxide supply apparatus, 9 First on-off valve, 10 Bubble injection apparatus, 10b Pulse bubble injection device, 11 water pump, 12 degassing valve, 13 hot water supply pipe, 14 hot water storage tank, 15 hot water supply pipe, 16 discharge pipe, 17 third on-off valve, 18 carbon dioxide concentrating part, 19 second on-off valve, 20 air blowing Pump, 21 Intake pipe, 22 Negative pressure forming part, 23 Gas-liquid mixing part, 24 Control part, 25 Temperature detection part, 25a Temperature detection part, 25b Temperature detection part, 26 Heating part, 27 Dilution water pipe, 28 Heating pipe, 29 Heat exchanger for reheating, 30 circulation pump, 31 circulation pump, 32 circulation piping for reheating, 33 bathtub, 100 water heater.

A circulation piping system according to the present invention is connected to a circulation piping for circulating water between a first device and a second device, a bubble injection device for injecting bubbles into water, and a bubble injection device. A carbon dioxide supply device that supplies carbon dioxide to cause generation, and a controller that controls the bubble injection device and the carbon dioxide supply device so that bubbles containing carbon dioxide are intermittently injected into the water circulating in the circulation pipe. The bubble injection device is connected to a carbon dioxide supply device, and forms a negative pressure with respect to the supplied carbon dioxide, and carbon dioxide taken into the negative pressure formation portion via the negative pressure. A gas-liquid mixing unit for mixing with water, a first on-off valve connected between the negative pressure forming unit and the carbon dioxide supply device and controlled to be opened and closed by the control unit. A blower pump for supplying A carbon dioxide concentrating unit that adsorbs carbon dioxide contained in the air, a second on-off valve that is connected between the carbon dioxide concentrating unit and the blower pump and that is controlled to be opened and closed by the control unit, and carbon dioxide A discharge pipe for discharging the air that has flowed to the concentration section; and a third on-off valve that is connected between the carbon dioxide concentration section and the discharge pipe and that is controlled to be opened and closed by the control section. The first on-off valve is closed, the second on-off valve and the third on-off valve are open, the first valve operating state, the first on-off valve is open, and the second on-off valve and the third on-off valve are closed Control that alternately repeats the second valve operating state is performed .

Claims (10)

A circulation pipe for circulating water between the first device and the second device;
A bubble injection device for injecting bubbles into the water;
A carbon dioxide supply device connected to the bubble injection device for supplying carbon dioxide to generate the bubbles;
A circulation piping system comprising: a control unit that controls the bubble injection device and the carbon dioxide supply device so that the bubbles containing the carbon dioxide are intermittently injected into the water circulating through the circulation piping. The bubble injection device includes:
A negative pressure forming unit connected to the carbon dioxide supply device and forming a negative pressure with respect to the supplied carbon dioxide;
A gas-liquid mixing unit that mixes the carbon dioxide taken into the negative pressure forming unit via the negative pressure with the water;
The circulation piping system according to claim 1, further comprising: a first on-off valve connected between the negative pressure forming unit and the carbon dioxide supply device and controlled to be opened and closed by the control unit. The carbon dioxide supply device includes:
A carbon dioxide concentrating unit that adsorbs carbon dioxide contained in the air, as the carbon dioxide to be supplied with a blower pump that flows air in the atmosphere;
A second on-off valve connected between the carbon dioxide concentrating unit and the blower pump and controlled to be opened and closed by the control unit;
A discharge pipe for discharging the air that has flowed to the carbon dioxide enrichment section;
The circulation piping system according to claim 1, further comprising a third on-off valve connected between the carbon dioxide concentrating unit and the discharge pipe and controlled to be opened and closed by the control unit. The control unit includes a first valve operating state in which the first on-off valve is closed and the second on-off valve and the third on-off valve are open. The circulation piping system according to claim 3, wherein control is performed to alternately repeat an on-off valve and a second valve operating state in which the third on-off valve is closed. The control unit has a duration of the second valve operating state of 5 to 20 seconds, a duration of the first valve operating state is longer than three times a duration of the second valve operating state, and The circulation piping system according to claim 4, wherein control is performed to be shorter than 360 times. A temperature detection unit for detecting the temperature of the carbon dioxide concentration unit;
The circulation piping system according to claim 3, wherein the control unit controls opening and closing of the third on-off valve based on the temperature detected by the temperature detection unit. The circulation piping system according to any one of claims 1 to 6,
The first device is a heat exchanger for heating the water;
The second device is a hot water storage tank for storing the water,
A carbon dioxide-containing water supply system comprising a hot water supply pipe for supplying hot water stored in the hot water storage tank. The carbon dioxide-containing water supply system according to claim 7, wherein the carbon dioxide supply device supplies the carbon dioxide to the water supplied by the hot water supply pipe. A circulation piping system according to claim 1;
A water pipe for supplying water,
The bubble injection device is connected to the water pipe, and injects the bubbles containing the carbon dioxide into the water pipe. A circulation piping system according to claim 1;
With a bathtub,
The bubble injection device is connected to the bathtub and injects the bubbles containing the carbon dioxide into the bathtub.

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