JP2010255976A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system capable of cooling spring water having pH of about 1-2, which is difficult to be handled with a simple constitution, rising a temperature over a cooling temperature of the spring water without installing a boiler, and supplying the produced hot water. <P>SOLUTION: This hot water supply system includes a spring tank 10 storing the spring water and having a spring water outlet 14 at a lower section of a side wall 10a, a tube 11 disposed in a meandering state from the lower section of the side wall 10a toward a water surface of the spring water through the inside of the spring water and composed of a plastic resin to circulate the water therein, a distributing means 12 connected with the tube 11 and supplying the water into the spring tank 10 or sucking the hot water produced by being heated by the spring water, and a hot water storage tank 13 receiving the produced hot water and storing the hot water to supply the hot water. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a system that heats water using exhaust heat generated when cooling source water and supplies generated hot water.

  Depending on the temperature and amount of the source water in the area where the source is located, a certain amount of the source water is supplied to the bathtub, and tap water is supplied to dilute it to make the temperature appropriate.

  In recent years, heat exchange is performed between the source water and tap water, the temperature of the source water is cooled to a temperature suitable for bathing, the heated tap water is further heated with a boiler, etc. It is used for washing places.

  As a technique for performing heat exchange between such source water and tap water and cooling the source water, for example, the following techniques have been proposed (refer to Patent Documents 1 to 3 for details).

  A hot spring water supply line that supplies hot spring water supplied from a hot spring source to the bathtub and at least one heat exchanger installed in the line, and the heat exchanger uses hot spring water as a heating source. A multi-purpose heat utilization system has been proposed that can be used individually for equipment and facilities, and can also supply cooling hot spring water for pure natural hot spring baths. In this system, the heat of hot spring water can be used for multiple purposes through the intervention of a heat exchanger, and the cost of tap water can be saved.

  Each of the heat exchanger that heats the cooling water from the hot spring pumped up to produce hot water and reduces the temperature of the hot spring to the supply temperature to the bathtub, and each of the heat exchanger and hot spring supply piping There has been proposed a source temperature reduction system having a cleaning device for removing deposits adhering to the inside of a pipe. This system can supply hot spring components to the bathtub without diluting it by reducing the temperature of the hot spring using heat exchange technology, and the hot spring attached to the hot spring supply pipe from the hot spring supply pipe to the heat exchange tube and bathtub. It can be appropriately washed before the components are hardened.

  The source tank and the heat exchanger are connected by a first circulation line having a first pump in the middle, and the heat exchanger and the primary storage tank are connected by a second circulation line having a second pump in the middle. It connects and enables heat exchange between the source water and the general water, and the control device controls the first pump and the second pump according to the temperature of the source water in the source tank and the temperature of the general water in the primary storage tank. There has been proposed a source heat recovery device that controls the driving of the spring. In this device, when the temperature of the source water in the source tank is high, the control device increases the drive of the first pump and the second pump based on signals from temperature sensors provided in the source water tank and the primary storage tank. Thus, when the source water is set to an appropriate temperature and the temperature of the source water becomes too low, the driving of the first pump and the second pump is reduced or stopped so that heat exchange is not performed. .

JP 2007-93061 A JP 2005-221190 A Japanese Patent Laid-Open No. 9-14750

  In the system and apparatus described above, a heat exchanger is used to cool the source water using a heat exchanger, but a heat exchanger is required, but the strongly acidic (pH 1-2) source water that is difficult to handle is brought to a temperature suitable for bathing. The heat exchanger to be cooled contains metal such as iron in the source spring, so when two different metals are used, electric corrosion, which is an action that forms a battery and significantly corrodes the metal, easily occurs. Even stainless steel may have holes.

  In addition, heat exchangers have a structure in which unevenness is provided, the number of tubes is increased, or the heat transfer area is increased by increasing the number of tubes, but the source water contains various components that are hardened. To form a scale that must be removed periodically to cover the surface and reduce the heat transfer area. In the above prior art, it has been proposed to wash before curing, but since it is squeezed off with a sponge ball, the portion where the sponge ball cannot enter cannot be removed. Further, since the structure is as described above even at a location where a sponge ball can enter, the scale cannot be easily removed, and it takes time to remove it.

  Thus, heat exchangers are difficult to maintain when used for cooling the source water, and there is a risk of metal corrosion, so the source water can be used with a simple configuration without using a heat exchanger. It has been desired to provide a system that can be cooled.

  On the other hand, tap water or the like is used for cooling the source water. For example, when cooling the source water at about 85 ° C. to about 45 ° C. suitable for bathing, it can be performed using normal temperature water. . However, in order to raise the water to a temperature exceeding the cooling temperature of the source water, a plurality of heat exchangers must be installed or the heat transfer area must be very large. Considering the above corrosion, a special material must be used, and if the heat transfer area is increased, the material cost is very high, which is not realistic.

  Therefore, in general, water heated by a heat exchanger having an arbitrary heat transfer area is further heated by a boiler and used for hot water or a washing place. However, since heating with a boiler uses petroleum fuel, there is a problem that greenhouse gases are discharged.

  Therefore, it has been desired to provide a system that can raise the temperature to a temperature exceeding the cooling temperature of the source water and supply the generated hot water without installing a boiler.

  In order to solve the above-mentioned two problems at the same time, the present invention stores a source water and has a source tank having a source water outlet at the lower part of the side wall, and the surface of the source water through the source water from the lower part of the side wall. A tube made of plastic resin that is provided to meander toward the inside, and is connected to the tube, and sucks hot water generated by being heated or heated by the source water. It is configured to include a delivery means and a hot water storage tank that receives the generated hot water and stores the hot water to supply hot water.

  With this configuration, hot water having a temperature higher than the temperature of the source water cooled and discharged from the outlet can be generated. This discharge reduces the amount of source water stored, but it can be added by supplying hot source water from the upper part of the source tank. This addition increases the temperature of the source water, but only increases the temperature near the surface of the source water, and the temperature near the bottom is hardly affected. The temperature near the bottom can be controlled to a desired temperature, for example, by controlling the amount of water passing through the tube.

  The tube is preferably composed of a plurality of tubes in order to increase the heat transfer area and exchange heat more efficiently. In the case of a plurality of tubes, a water supply header that distributes water to each tube and a hot water collecting header that collects hot water generated by heat exchange in each tube can be provided. It can be connected to the header via a pipe.

  The tube must be made of a material that can withstand this temperature because it comes into contact with hot spring water of about 80-90 ° C. Examples of the plastic resin that can withstand this temperature include cross-linked polyethylene and polybutene.

  The source tank can be a concrete container having a resin lining on the inner surface that the source water contacts. Examples of the resin used for the resin lining include heat-resistant FRP (fiber reinforced plastic), fluorine resin, and epoxy resin.

  The tube is preferably secured to the side wall or bottom of the source bath with fasteners or adhesive. This is to prevent the stored source water from being agitated by the swinging of the tube and the like, and the temperature of the source water in the source tank to be uniform.

  The hot water supply system may further include a second tube located near the surface of the source water and immersed in the source water, and the delivery means circulates and heats the hot water in the hot water storage tank through the second tube. can do. Thereby, even if the hot water in the hot water tank is cooled, it can be reheated.

  In this hot water supply system, the source water cooled from the outlet can be taken out and new source water can be supplied to the surface of the source water stored in the source tank, so that the source water at a temperature suitable for bathing can be supplied. A sufficient amount and temperature of hot water can be supplied to a washing place or the like.

  Thus, by providing the hot water supply system of the present invention, it is possible to cool the source water with a simple configuration without using a heat exchanger, and after cooling without installing a boiler. It is possible to sufficiently supply hot water having a temperature higher than that of the source water.

The figure which showed one structural example of the hot water supply system. The figure which showed the example of installation of the tube used for a hot-water supply system. The figure which showed another structural example of the hot water supply system.

  FIG. 1 is a diagram showing one configuration example of a hot water supply system. The hot water supply system shown in FIG. 1 includes a source bath 10, a tube 11, a delivery means 12, and a hot water storage tank 13.

  The source tank 10 stores hot source water at a temperature of about 80 to 90 ° C. that springs from the ground, and has an outlet 14 and a valve 15 for extracting the source water at the bottom of the side wall 10a. 10b has an outlet 16 and a valve 17 for draining water. The source tank 10 has a capacity capable of storing a predetermined amount of source water, and since the source water is strongly acidic (pH 1-2), it is formed of concrete that does not easily corrode. In addition, even if it is made of concrete, reinforcing bars are used in the interior from the viewpoint of strength, and concrete may cause cracks, etc., and the source water may penetrate into the reinforcing bars and corrode. The resin lining 18 is given to the inner surface which contacts.

  The resin used for the resin lining 18 must have heat resistance and acid resistance, and FRP, epoxy resin, fluororesin, polyester, and the like can be employed. In terms of strength, heat resistance, and acid resistance, FRP is particularly preferable, and glass fiber reinforced plastic including glass fiber and carbon fiber reinforced plastic including carbon fiber are preferable.

  The source tank 10 is a container composed of a concrete side wall 10a and a bottom 10b, and the outlet 14 has a diameter capable of sending the source water at a predetermined flow rate. The source tank 10 has a side wall 10a adjacent to the bottom 10b. It is provided at the bottom. Since the source water has a predetermined liquid level, the source water can be delivered by simply opening the valve 15 without connecting a pump or the like to the outlet 14. The flow rate can also be controlled by adjusting the valve opening of the valve 15.

  The outlet 16 is provided in the bottom 10b so that all the source water stored in the source tub 10 can be extracted, and the flow rate of the outlet 16 may be any diameter, and may have any diameter. The valve 17 can be selected in accordance with the diameter of the outlet 16 and can be appropriately closed so that the source water does not leak out. The valves 15 and 17 are preferably those that can be properly closed so as not to leak, and a globe valve is preferable.

  Pipes are used for the outlets 14 and the outlets 16, and the pipes and the valves 15 and 17 are generally made of metal, which may cause corrosion. For this reason, resin lining is given also about these. Moreover, about these, it is also possible to use what was manufactured with the plastic resin similarly to the tube 11 mentioned later.

  In addition to the outlet 14, the side wall 10 a is provided so that the tube 11 penetrates in the vicinity of the outlet 14. There is no gap between the side wall 10a made of concrete and the tube 11, so that the source water does not leak from there.

  The tube 11 is provided so as to meander from the lower part of the side wall 10a through the source water to the water surface of the source water, and the material thereof is made of plastic resin. If it is made of metal, the source water has a strong acidity, so that electric corrosion occurs and corrodes. Melted plastic resin can be poured into a mold and cooled to form a meandering tube. However, a bellows type tube can be bent and arranged freely. Thus, by making the tube 11 into a bent shape, the length can be increased and a larger heat transfer area can be ensured. The bellows type tube is preferable in that it has a larger heat transfer area because the tube wall has a structure with irregularities.

  Specifically, when viewed from the side, the tube 11 has a shape meandering from the bottom of the side wall 10a to the water surface as shown in FIG. 2 (a), and water flows from the bottom to the top. To be done.

  The tube 11 is preferably composed of a plurality of tubes in order to increase the heat transfer area. This is because if the plurality of tubes are used, the flow rate of water flowing through the inside of the tubes is slowed down, and the temperature can be raised to a higher temperature by giving sufficient heat. For example, a plurality of tubes having an inner diameter of about 10 to 20 mm can be used. When viewed from above, the plurality of tubes, as shown in FIG. 2 (b), are connected to the water supply header 21 at one end, and can be arranged in the depth direction at substantially equal intervals.

  Here, the tube 11 is provided so as to meander from the side wall 10a to the surface of the source water through the source water, while simultaneously increasing the heat transfer area and supplying water from the vicinity of the bottom of the source tank 10 This is because the water is gradually heated by flowing toward the water surface to form a temperature distribution such that the temperature of the source water decreases as it moves from the water surface to the bottom of the water.

  This temperature distribution is a phenomenon that occurs because the source water has a density difference between the vicinity of the water surface and the vicinity of the bottom of the water. In the vicinity of the bottom of the water, for example, low temperature water of about 5 to 15 ° C. is supplied. Can do. On the other hand, in the vicinity of the water surface, the water flowing in the tube 11 has been heated by the source water so far, so the temperature of the source water near the water surface does not greatly decrease, and the temperature of the source water is about 85 ° C. If there is, the temperature in the vicinity of the water surface is about 60 to 75 ° C. For this reason, the water in the tube 11 passing through the water surface can be heated to about 50 to 65 ° C., hot water at that temperature is generated and sent out to the hot water storage tank 13 by the sending means 12.

  The plastic resin that can be used for the tube 11 must have heat resistance and acid resistance. That is, since the source water is a strong acid having a pH of 1 to 2, it must be able to withstand it and withstand temperatures of about 80 to 90 ° C. Therefore, for example, cross-linked polyethylene and polybutene can be used. For example, a crosslinked polyethylene pipe or a polybutene pipe can be used. By adopting such a resin tube, corrosion is eliminated and maintenance is easy. Since this plastic resin also has alkali resistance, it can be employed even if the source water is alkaline.

  The delivery means 12 can be a pump, and even if the installation location is on the side supplying water into the source bath, as shown in FIG. 1, the hot water generated by heating with the source water is sucked. It may be the side to do. In any case, the sending means 12 sends the generated hot water to the hot water storage tank 13 for supplying hot water. This pump can adopt a suitable pump such as a spiral pump in consideration of the capacity, the head, and the suction head (NPSH).

  The hot water storage tank 13 is a tank having a predetermined capacity, and the shape thereof may be any shape. Further, the hot water storage tank 13 is configured to supply hot water to the hot water supply use point 20 by the circulation pump 19 and return excess hot water from the hot water supply use point 20. For this purpose, a nozzle for receiving hot water from the delivery means 12, a nozzle for supplying hot water to the hot water supply use point 20, and a nozzle for receiving hot water from the circulation pump 19 are provided. The capacity of the hot water tank 13 can be determined according to the amount of hot water used. The hot water use point 20 indicates a place where hot water is used, and can be, for example, a bathroom, a dresser, a kitchen, or the like.

  As described above, the tube 11 can be composed of a plurality of tubes. When the tube 11 is composed of a plurality of tubes, the water supply header 21 that distributes water to each tube and the hot water generated by heat exchange in each tube. Can be provided, and the delivery means 12 can be connected to the water supply header 21 or the hot water collection header 22 via a pipe. In FIG. 1, the sending means 12 is connected to the hot water collection header 22.

  The water supply header 21 includes a nozzle for receiving hot water from the hot water storage tank 13, a nozzle for receiving water such as tap water, and a plurality of nozzles for connecting a plurality of tubes. On the other hand, the hot water collecting header 22 includes a plurality of nozzles for connecting a plurality of tubes and a nozzle for connecting to the delivery means 12.

  In the present invention, the tube 11 made of plastic resin is used, but it is lightweight and easily swings in the source water due to vibration from the delivery means 12 and the like. In general, since it is not so large, it is considered that there is no influence. However, when the oscillation occurs, an effect of stirring the source water is given, and thus the formed temperature distribution is lost. This makes it impossible to heat the water to a predetermined temperature such as about 50 to 65 ° C., and the source water cannot be cooled to a temperature of about 40 to 45 ° C. suitable for bathing. End up.

  For this reason, it is preferable that the tube 11 is fixed to the side wall 10a or the bottom 10b. This fixing can be performed using a U-shaped fastener made of plastic resin, a heat-resistant epoxy adhesive, or the like.

  An operation method of the hot water supply system shown in FIG. 1 will be described. First, hot source water is put into the source tank 10. For example, about 80% of the capacity of the source bath 10 is added to the source water. At this time, the temperature of the source water is still almost uniform. The source water is supplied by using a natural head and a natural head of the water source and the source tank 10, but if this is not possible, it can be supplied by using a plastic resin pump or the like.

  Water is supplied to the water supply header 21, the tube 11, and the hot water collection header 22, and the delivery means 12 is activated. The sending means 12 sucks the supplied water through the water supply header 21, the tube 11, and the hot water collection header 22, and sends it out to the hot water storage tank 13.

  The water in the tube 11 is heated from the bottom of the source water toward the surface of the water, and becomes hot water and is sent to the hot water storage tank 13. By repeating this, hot water is accumulated in the hot water tank 13.

  When the temperature in the vicinity of the bottom of the source bath 10 is lowered by normal-temperature water that is sequentially supplied, and the temperature is lowered to a temperature suitable for bathing, the valve 15 is opened and the source water can be taken out from the outlet 14. Since the amount of the source water in the source tank 10 is reduced by the extraction of the source water, the source water is newly added. This addition can be made to the hottest water surface where the temperature distribution is formed. Since this additional source water has the highest temperature and the lowest density, it is stored near the surface of the source water. For this reason, in the vicinity of the bottom of the water, the temperature does not change so much even by this addition, and water is also sequentially supplied to the tube 11, so that it can be taken out at a temperature suitable for bathing.

  For example, when about 50 to 70% of the capacity of the hot water storage tank 13 is stored, the circulation pump 19 can be activated to circulate hot water between the hot water use point 20. When hot water is used at the hot water use point 20, the amount of hot water stored in the hot water storage tank 13 is reduced. However, since hot water can be generated by supplying water to the tube 11, the amount of hot water stored can be maintained almost constant. it can.

  When the amount of hot water used at the hot water supply use point 20 is small, the amount of hot water in the hot water storage tank 13 does not decrease, so the supply of water can be stopped and the production of hot water can be stopped. In this case, the temperature of the source water cannot be lowered by stopping the supply of water. Therefore, it is allowed to stand as it is, the temperature is lowered by natural cooling, and when it reaches about 40 to 45 ° C. suitable for bathing, it can be supplied to a bathhouse or the like.

  As another embodiment, the hot water supply system may further include a tube 30 that is immersed in a position adjacent to the surface of the source water, as shown in FIG. The tube 30 can receive hot water stored in the hot water storage tank 13, send it to the delivery means 12, and circulate the hot water in the hot water storage tank 13.

  Since this tube 30 is immersed in the vicinity of the surface of the hot spring water, when the temperature of the hot water in the hot water storage tank 13 is lowered, the hot water can be heated. In addition, when the supply of water to the tube 11 is stopped, the tube 30 circulates the hot water in the hot water storage tank 13 inside, gives the heat of the source water to the hot water, and naturally cools the temperature of the source water. It can also be used to drop quickly.

  Similarly to the tube 11, the tube 30 can be composed of a plurality of tubes, and the same material can be adopted. Moreover, when it comprises from a some tube, a water supply header and a hot water collection header can be used, a valve is provided in each of the tube 11 and the tube 30, and the sending means 12 sucks only any one hot water, Can be switched.

  So far, the hot water supply system of the present invention has been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the above-described embodiments, and other embodiments and additional It is possible to make changes within the range that can be conceived by those skilled in the art, such as changes, deletions, and the like, and any embodiment is included in the scope of the present invention as long as the operations and effects of the present invention are exhibited.

  By providing a hot water supply system of the present invention, a tube made of a plastic resin such as a cross-linked polyethylene pipe is adopted for source water that is difficult to handle, the source tank is made of concrete, and a resin lining such as a heat-resistant FRP lining is used. By applying, there is no metal corrosion, and since a heat exchanger is not used, maintenance is facilitated. Moreover, since the source water can be cooled and the hot water can be generated at the same time, it is efficient, and the generated hot water can be used as a heat source for melting snow. Furthermore, even if it comprises a plurality of tubes, the interval between the tubes is wide, and the scale can be easily removed.

DESCRIPTION OF SYMBOLS 10 ... Source tank, 10a ... Side wall, 10b ... Bottom, 11 ... Tube, 12 ... Delivery means, 13 ... Hot water storage tank, 14 ... Outlet, 15 ... Valve, 16 ... Outlet, 17 ... Valve, 18 ... Resin lining, DESCRIPTION OF SYMBOLS 19 ... Circulation pump, 20 ... Hot water use point, 21 ... Water supply header, 22 ... Hot water collection header, 30 ... Tube

Claims (7)

A hot water supply system that generates hot water and cools the source water to supply both the hot water and the cooled source water,
A source tank that stores the source water and has an outlet for the source water at the bottom of the side wall;
A tube made of a plastic resin that is provided so as to meander toward the surface of the source water through the inside of the source water from the lower portion of the side wall;
Sending means connected to the tube and supplying the water into the source bath or sucking hot water generated by being heated by the source water;
A hot water storage tank for receiving the generated hot water and storing the hot water to supply hot water;
A hot water supply system, wherein hot water having a temperature higher than that of the source water discharged from the outlet is generated.   The hot water supply system includes a plurality of the tubes, a water supply header that distributes the water to the tubes, and a hot water collection header that collects the hot water generated by heat exchange in the tubes. The hot water supply system according to claim 1, wherein a sending means is connected to either the water supply header or the hot water collection header.   The hot water supply system according to claim 1 or 2, wherein the tube is a cross-linked polyethylene pipe or a polybutene pipe.   The hot water supply system according to any one of claims 1 to 3, wherein the source bath is a concrete container having a resin lining on an inner surface with which the source water contacts.   The hot water supply system according to any one of claims 1 to 4, wherein the tube is fixed to the side wall or bottom of the source bath with a fastener or an adhesive.   A second tube disposed adjacent to the surface of the source water and immersed in the source water; and the delivery means circulates and heats the hot water in the hot water storage tank through the second tube. The hot water supply system according to any one of claims 1 to 5.   The hot water supply system according to any one of claims 1 to 6, wherein the source water cooled from the outlet is taken out and new source water is supplied to a surface of the source water stored in the source tank. .

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