JP4590372B2 - Heat exchanger and air conditioning system - Google Patents

Description

The present invention relates to heat exchangers and relates to air conditioning systems, air conditioning systems, in particular comprising a heat exchanger and the heat exchanger with reduced pressure loss.

  In recent years, a radiant cooling and heating system has attracted attention as a cooling and heating system that achieves both energy saving and comfort. The radiant cooling and heating system is a system that cools (warms) a radiant panel installed on a ceiling surface, a floor surface, or the like, and adjusts the temperature of the air conditioning room by radiant heat from the radiant panel. Air conditioning with radiant heat is different from cold air conditioning that blows out temperature-controlled air from the air outlet. Not only does the occupant feel the airflow, but the sound is quiet, the room temperature is uniform, and you can experience a smooth space. can do. Further, in the radiant cooling and heating system, the temperature of the cold water (hot water) used to cool (warm) the radiant panel may be higher (lower) than the cold / hot air conditioning system that blows out low-temperature (high-temperature) air. For this reason, it can be said that the radiant cooling and heating system is a more energy-saving system. A general radiant cooling and heating system is configured by closely placing a tube through which cold water (hot water) flows inside a surface (ceiling, floor, etc.) partitioning a room for air conditioning so as to repeat a U shape. (For example, refer to Patent Document 1).

  On the other hand, as a system for realizing energy saving, development of a system that effectively uses unused water such as rainwater, seawater, sewage treated water is expected. The unused water utilization system is designed to take out the amount of heat (including cold energy) held by unused water and effectively use it.

Japanese Patent Laying-Open No. 2005-24197 (paragraph 0024, FIG. 4-5, etc.)

  In a radiant cooling and heating system in which tubes are placed densely on a surface that partitions a room for air conditioning, the length of the tube tends to increase, and this increases pressure loss due to tube frictional resistance. I was sorry. In addition, a temperature gradient may occur in the cold water (hot water) flowing through the tube due to the tube portion that tends to increase in length, and temperature unevenness may occur in a room for air conditioning.

  On the other hand, since unused water is often mixed with sand or other sand (solid matter) such as sand, heat is generated from unused water using a plate heat exchanger generally used as a water-water heat exchanger. It is difficult to take out. If the pipe that flows the heat recovery medium is submerged in unused water without using a plate heat exchanger, it will be necessary to lengthen the pipe that flows the heat recovery medium in order to increase the heat transfer area. As a result, pressure loss due to pipe frictional resistance has increased.

In view of the above problems, and an object thereof is to provide a cooling and heating system that to reduce the generation of heat exchangers and temperature unevenness with reduced pressure loss.

In order to achieve the above object, the heat exchanger according to the first aspect of the present invention includes, as shown in FIG. 2, for example, a first flow path in which a first fluid CA flows in one direction. conduit 11 and, first in the conduit inside 11 and the transfer device 15 for flowing a first fluid CA; disposed within the first conduit 11 along a direction in which the first conduit 11 extends, the first A second conduit 12 through which a second fluid CH that exchanges heat with the second fluid CA flows; an insertion hole 11p is formed in the first conduit 11; and the second conduit 12 is connected to the first fluid CA. A parallel pipe 13 that flows the second fluid CH in the same direction as the flow direction of the first fluid CA, and a counter pipe 14 that flows the second fluid CH in the direction opposite to the flow direction of the first fluid CA. The counter pipe 14 is continuous, and the parallel pipe 13 and the counter pipe 14 are opposed to the parallel pipe 13 through the same insertion hole 11p. The continuous edge portion 12e of the 14 constructed as the opposite end is guided to the outside of the first conduit 11, and the continuous end portion 12e of the parallel tubes 13 and the opposing tube 14 insertion hole 11p It arrange | positions in the 1st conduit | pipe 11 so that it may return .

If comprised in this way, heat exchange will be performed between the 2nd fluid which flows in the 2nd conduit | pipe, and the 1st fluid made to flow by the conveyance apparatus, and exchange per unit length The amount of heat can be increased. Thereby, when using a heat exchanger for a radiant cooling and heating system, for example, the surface area of a 1st conduit | pipe can be enlarged, and by shortening of the 1st and 2nd conduit | pipe accompanying increase in a radiant heat transfer area The pressure loss can be reduced, and the second conduit has a parallel pipe for flowing the second fluid in the same direction as the flow direction of the first fluid and the second pipe in the direction opposite to the flow direction of the first fluid. The parallel pipe and the counter pipe are continuous, the parallel pipe and the counter pipe pass through the same insertion hole, and the end opposite to the continuous end of the parallel pipe and the counter pipe Since the portion is configured to be guided out of the first conduit , and the continuous ends of the parallel pipe and the counter pipe are arranged in the first conduit so as to return to the insertion hole , The average temperature of the first fluid in the first conduit is substantially uniform, and temperature unevenness is reduced. For example, when the heat exchanger is used in a waste heat recovery system using the second fluid as a heat recovery medium, the pressure loss can be reduced by shortening the second conduit.
Further, the first fluid is air; and the transport device is configured by an air amplifier that supplies compressed air into the first conduit and sucks and sends out air that has been in the first conduit. It may be.
Further, the first conduit may be embedded in floor concrete.

  A heat exchanger according to a second aspect of the present invention is the heat exchanger according to the first aspect, wherein the second conduit is formed of a flexible material.

  If comprised in this way, it will become easy to arrange | position a 2nd conduit | pipe in a 1st conduit | pipe, and workability will improve.

In order to achieve the above object, the cooling and heating system according to the invention described in claim 5 is disposed adjacent to a space R for cooling or heating, for example, as shown in FIG. 4 is provided; a second conduit 12 (see, for example, FIG. 2) is connected to a heat source G that adjusts the temperature of the second fluid CH.

  If comprised in this way, it can cool or heat by the thermal radiation to the space which cools or heats from a heat exchanger, and construction of a quiet air conditioning space without a draft feeling is attained. Here, the thermal radiation includes not only warm radiation but also cold radiation that radiates cold heat.

Further, for example, as shown in FIG. 3 , the heat exchanger 30 and a storage tank 38 for storing the first fluid RW are provided; the transfer device 35 supplies the first fluid RW in the storage tank 38 to the first fluid RW. A waste heat recovery system configured to lead to the conduit 31 may be used.

  If comprised in this way, the heat | fever discarded with the 1st fluid will be collect | recovered by heat-exchange with a 2nd fluid, and the utilization of the collect | recovered heat will be attained. The recovered heat includes not only warm heat but also cold heat.

According to the present invention, heat exchange is performed between the second fluid that flows in the second conduit and the first fluid that is caused to flow by the transfer device, so that the exchange per unit length is performed. The amount of heat can be increased. Thus, for example, when using a heat exchanger in a radiant cooling and heating system, the surface area of the first conduit can be increased, and the first and second conduits can be shortened as the radiant heat transfer area increases. The pressure loss can be reduced, and the second conduit has a parallel pipe for flowing the second fluid in the same direction as the flow direction of the first fluid and the second pipe in the direction opposite to the flow direction of the first fluid. The parallel pipe and the counter pipe are continuous, the parallel pipe and the counter pipe pass through the same insertion hole, and the end opposite to the continuous end of the parallel pipe and the counter pipe Since the portion is configured to be guided out of the first conduit , and the continuous ends of the parallel pipe and the counter pipe are disposed in the first conduit so as to return to the insertion hole , The average temperature of the first fluid in the first conduit is substantially uniform, and temperature unevenness is reduced.

  Embodiments of the present invention will be described below with reference to the drawings. In each drawing, the same or corresponding members are denoted by the same or similar reference numerals, and redundant description is omitted.

  First, with reference to FIG.1 and FIG.2, the air conditioning system 20 which concerns on the 2nd Embodiment of this invention provided with the heat exchanger 10 which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a perspective view showing the concept of the air conditioning system 20. FIG. 2 is a detailed view of part A of FIG. 1 and shows a part of the heat exchanger 10. In the air conditioning system 20, the heat exchanger 10 is laid on the floor of the air conditioning space R that is a space for cooling or heating, and the pair tube 12 as the second conduit of the heat exchanger 10 and the heat source G are connected to each other. 82 is connected.

  Hereinafter, the heat exchanger 10 will be described in detail with reference to FIG. The heat exchanger 10 includes a duct 11 as a first conduit, a pair tube 12, and a transfer device 15.

  The duct 11 is a wind guide that causes the air CA as the first fluid to flow inside. The duct 11 can have various shapes such as a round duct and a rectangular duct, and a pipe material may be used. From the viewpoint of ease of processing and assembly, it is preferable to use a round duct or a piping material. The duct 11 can be made of various materials such as galvanized steel sheet, carbon steel pipe and stainless steel, or synthetic resin. It is preferable to use a metal material having a relatively large heat transfer coefficient from the viewpoint of increasing the amount of heat transferred to the air (concrete forming the floor slab) (see FIG. 1), and from the viewpoint of corrosion resistance, synthetic resin. It is preferable to use the product made from a product. Inside the duct 11, the air CA is caused to flow in one direction by the transfer device 15. A pair tube 12 is disposed inside the duct 11.

  The pair tube 12 allows water CH as the second fluid to flow inside. The second fluid may be a liquid that can be a heat medium other than water. The water CH is sometimes referred to as “cold / warm water CH” because of its use. The pair tube 12 includes a parallel pipe 13 for flowing cold / hot water CH in the same direction as the flow direction of the air CA flowing inside the duct 11, and a counter pipe 14 for flowing cold / hot water CH in a direction opposite to the flow direction of the air CA in the duct 11. And have. One end of the parallel pipe 13 and one end of the counter pipe 14 are typically continuous in the duct 11, and the cold / hot water CH can flow continuously between the parallel pipe 13 and the counter pipe 14. It is configured as follows. The other end of the parallel pipe 13 (the end opposite to the end connected to the counter pipe 14) and the other end of the counter pipe 14 (the end opposite to the end connected to the parallel pipe 13) are Then, it is guided out of the duct 11 and connected to the heat source G (see FIG. 1) via the connecting pipe 82.

  The pair tube 12 is used with a nominal diameter of about 7A to 25A per one (each of the parallel pipe 13 and the counter pipe 14) according to the flow rate of the cold / hot water CH flowing inside, but other sizes are used. May be used. The pair tube 12 is typically a synthetic resin tube having flexibility, such as a crosslinked polyethylene tube or a polybden tube. When a material having flexibility is used, workability can be improved. The pair tube 12 may be a metal tube such as a copper tube having a relatively high heat transfer coefficient. However, it is preferable to use a synthetic resin pipe having flexibility from the viewpoint of improving corrosion resistance and workability.

  The pair tube 12 may be configured such that the parallel tube 13 and the counter tube 14 are in contact with each other, or may be configured to be separated from each other. In addition, a portion where the parallel tube 13 and the counter tube 14 of the pair tube 12 are continuous (folded portion 12e) may be formed by bending one tube, and the parallel tube 13 using a U-shaped joint. And the opposite tube 14 may be connected. In addition, when the pair tube 12 is disposed in the duct 11, a spacer (not shown) is attached to the pair tube 12 at an appropriate interval so that air CA exists around the pair tube 12. It is preferable to make it.

  The transport device 15 is a device that causes the air CA in the duct 11 to flow. For example, an air amplifier that sucks and sends out ambient air CA by supplying compressed air is used as the transport device 15. The air amplifier 15 can send out air CA about 10 to 25 times the supplied compressed air, for example. The air amplifier 15 is typically disposed in the duct 11. A compressed air pipe 16 for supplying compressed air is connected to the air amplifier 15. Note that a fan (typically a line fan) that operates upon receiving power supply may be used as the transport device 15. When a line fan is used, the line fan is typically disposed in the middle of the duct 11, and at this time, the discharge port of the line fan is accommodated in the duct 11.

  The size of the duct 11 (corresponding to the diameter in the case of having a circular cross section) is such a size that the pair tube 12 and the discharge port of the air CA of the transfer device 15 can be accommodated therein. When the duct 11 has a circular cross section, the inner diameter is typically 50 mm or more. When the carrier device is the air amplifier 15, the duct 11 is formed with an escape hole 11 h for releasing the supplied compressed air.

  Next, with reference to FIG.1 and FIG.2, an example of the installation procedure in the air conditioning system 20 of the heat exchanger 10 which has the above structures is demonstrated. In the following description, it is assumed that the pair tube 12 is a synthetic resin having flexibility. First, the duct 11 is installed at a position adjacent to the cooling / heating space R. The position adjacent to the heating / cooling space R is a position at which heat dissipation or heat absorption (cooling radiation) of the heat exchanger 10 can be applied to the cooling / heating space R, for example, the ceiling (regardless of concealment or exposure), Under the floor (slab driving) and wall surface (both inside and outside), and in this embodiment, the floor. When the heat exchanger 10 is laid on the floor, the entire cooling / heating space R can be warmed particularly efficiently during heating. In the present embodiment, first, the duct 11 is laid on the concrete slab before finishing. At this time, the duct 11 is installed so as to form a circulation flow path by meandering so as to repeat a U-shape so as to be as dense as possible in a plane. To make it as dense as possible, considering the flexibility of the pair tube 12 to be inserted into the duct 11 later, the U-shaped radius of curvature is reduced within a range in which the pair tube 12 can be inserted along the U shape. It is to be. When the duct 11 is installed so as to be as dense as possible in a plane, the size (diameter) of the duct 11 is larger than the diameter of the tube through which cold / hot water used in a general radiant cooling / heating system is used. The total length of the duct 11 installed per area can be significantly shortened compared with the total length of the tube used in a general radiant cooling and heating system.

  When the duct 11 is installed at a predetermined place, the pair tube 12 is inserted into the duct 11 with the folded portion 12e as the leading portion. An insertion hole 11p is formed in a portion of the duct 11 where the pair tube 12 is inserted. At this time, if a spacer (not shown) is attached to the pair tube 12 and inserted as necessary, it is preferable because the distance between the inner wall of the duct 11 and the pair tube 12 can be maintained. Since the pair tube 12 has flexibility, it can be inserted along the length of the duct 11. The pair tube 12 is inserted until the folded portion 12e returns to the insertion hole 11p. In addition, when the pair tube 12 does not have flexibility, the duct 11 and the pair tube 12 are extended simultaneously (installed simultaneously). When the insertion of the pair tube 12 into the duct 11 is completed, the insertion hole 11p is closed. Note that the insertion hole 11p may be used as the escape hole 11h without blocking all or part of the insertion hole 11p.

  When the pair tube 12 is inserted into the duct 11, the other end of the pair tube 12 outside the duct 11 is connected to the connection pipe 82. At this time, the parallel pipe 13 is connected to the connection forward pipe 83 of the connection pipe 82, and the counter pipe 14 is connected to the connection return pipe 84 of the connection pipe 82. And cinder concrete is laid from the heat exchanger 10 laid on the concrete slab before finishing, and the heat exchanger 10 is embed | buried under floor concrete. At this time, when the escape hole 11h is formed in the duct 11, a flow path that can prevent the concrete from flowing into the duct 11 from the escape hole 11h using a sleeve and can discharge air from the escape hole 11h after finishing. Secure. Thereafter, the floor is finished to form a floor surface F of the air conditioning space R. Then, the connection pipe 82 is connected to the heat source G. At this time, the connection forward pipe 83 is connected to the cold / hot water outlet of the heat source G, and the connection return pipe 84 is connected to the cold / hot water inlet of the heat source G. The heat source G is typically a heat pump chiller capable of producing cold water and / or hot water of a predetermined temperature, but may be other than this, for example, a refrigerator or a cold / hot water generator, etc. There may be. That is, if the heat source G can introduce the cold / hot water CH flowing through the pair tube 12 in the duct 11 to adjust the temperature thereof and supply the cold / hot water CH of a predetermined temperature to the pair tube 12 again. Good.

  The operation of the air conditioning system 20 will be described with reference to FIGS. The air conditioning system 20 is a radiant air conditioning system that cools and heats the air conditioning space R with radiant heat from the heat exchanger 10. Here, the cooling / heating space R will be described as being cooled. Therefore, the second fluid CH is cold water. The parallel tube 13 of the pair tube 12 is supplied with cold water CH at a predetermined temperature from the heat source G via the connection forward tube 83. The predetermined temperature of the cold water supplied to the parallel pipe 13 is typically about 15 to 20 ° C., which is closer to the normal temperature (ambient environment temperature) than the cold water temperature (about 7 ° C.) during general cold air conditioning. Is enough. Therefore, the input energy required for producing cold water during cooling of the air conditioning system 20 can be less than that during general cold air conditioning, so that energy saving and low cost can be realized.

  The cold water CH that has flowed into the parallel pipe 13 flows in the parallel pipe 13 disposed in the duct 11, flows into the counter pipe 14 via the folded portion 12 e, flows in the counter pipe 14, and flows outside the duct 11. The connection return pipe 84 is reached. On the other hand, the air CA in the duct 11 is caused to flow by the transfer device 15. Thereby, heat exchange is efficiently performed between the cold water CH flowing in the parallel pipe 13 and the counter pipe 14 and the air CA flowing in the duct 11, the air CA is cooled, and the temperature of the cold water CH rises. At this time, the temperature of the cold water CH increases as it goes downstream when flowing through the parallel pipe 13, the folded portion 12 e, and the counter pipe 14. However, since the cold water CH flows in the pair tubes 12, the average temperature of the cold water CH in the pair tubes 12 The average temperature of the cold water CH in the partial parallel pipe 13 and the cold water CH in the counter pipe 14 can be made substantially uniform, and the air CA in the duct 11 can be cooled almost uniformly.

  The air CA in the duct 11 cooled by exchanging heat with the cold water CH cools the surface of the duct 11, transfers heat from the surface of the duct 11 to the floor concrete, and cools and cools the heating / cooling space R by cooling radiation from the floor surface F. Cool down. This phenomenon is explained in terms of heat transfer that the person feels cool because the amount of electromagnetic waves received by the person living in the heating / cooling space R is relatively reduced by cooling the surface of the floor surface F. However, here, for convenience, the cooling / heating space R is cooled by the cold radiation from the floor surface F.

  As described above, the size (diameter) of the duct 11 is larger than the diameter of the tube through which cold / hot water used in a general radiant cooling / heating system is used, so that the heat transfer area of the duct 11 is increased. Therefore, the unit length of the duct 11, that is, the unit length of the pair tube 12 can be shortened, and the pressure loss of the cold water CH flowing through the pair tube 12 can be reduced. As described above, since the air CA in the duct 11 is caused to flow by the conveying device 15, the surface of the duct 11 is cooled to such an extent that cold radiation from the heat exchanger 10 can be performed even if the pair tube 12 is shortened. be able to. Further, since the temperature of the cold water CH flowing in the pair tube 12 is a relatively high temperature of 15 to 20 ° C., the possibility of condensation is extremely low. Moreover, since the cooling / heating system 20 performs cooling by cooling radiation, a comfortable space without a draft can be provided.

  The temperature of the chilled water CH that has reached the connection return pipe 84 outside the duct 11 as a result of heat exchange with the air CA in the duct 11 is led to the heat source G and is suitable for cooling by the heat source G (15 to 20 ° C. After that, the air is supplied again to the parallel pipe 13 through the connection forward pipe 83 and is used for heat exchange with the air CA in the duct 11.

  Although the case of cooling has been described above, in the case of heating, hot water is used as the second fluid CH. In the case of heating, the temperature of the hot water CH that is adjusted by the heat source G and supplied to the parallel pipe 13 is typically about 25 to 30 ° C., and the temperature of the hot water at the time of general hot air conditioning (40 ° C. A temperature close to room temperature is sufficient. Therefore, since the input energy required for the hot water production at the time of heating of the air conditioning system 20 is less than that at the time of general hot air conditioning, energy saving and low cost can be realized. In the case of heating, heat exchange is efficiently performed between the hot water CH in the pair tube 12 and the air CA in the duct 11, and the air CA is uniformly warmed and the temperature of the hot water CH is lowered. The heated air CA warms the surface of the duct 11, transfers heat from the surface of the duct 11 to the floor concrete, and heats the cooling / heating space R by heat radiation from the floor surface F.

  In the above description, the heat exchanger 10 is described as being embedded in floor concrete, but may be disposed under the floor without being embedded in concrete. In this case, the heat exchanger 10 can be installed at the stage of finishing work. Moreover, you may arrange | position the heat exchanger 10 in the ceiling of the air conditioning space R. FIG. When the heat exchanger 10 is exposed to the ceiling, the air conditioning space R can be efficiently cooled and heated. In the heat exchanger 10, since the cold / hot water CH flows in the pair tube 12 disposed in the duct 11, even if the cold / hot water CH leaks from the pair tube 12, it can be collected in the duct 11. When installing on the ceiling, if the duct 11 is provided with a drain, it can be discharged without bringing water into the air conditioning space R.

Referring now to FIG. 3, described waste heat recovery system 40 Ru with a heat exchanger 30 according to a reference example. FIG. 3 is a conceptual diagram of the waste heat recovery system 40. Hereinafter, the waste heat recovery system 40 will be described as a system that recovers heat from rainwater. The recovered heat includes not only warm heat but also cold heat. That is, the recovered heat is heat that can be used with respect to the ambient environment temperature (normal temperature). The waste heat recovery system 40 includes a heat exchanger 30, a rainwater storage tank 38 as a storage tank that stores rainwater RW as a first fluid, and a rainwater treatment tank 39. The rainwater treatment tank 39 is a water tank for filtering the introduced rainwater RW to generate middle water used for toilet drainage or the like, and has a filtration device (not shown). The heat exchanger 30 includes an outer tube 31 as a first conduit, a pair tube 32 as a second conduit, and a pump 35 as a transport device. A pumping pipe 36 for pumping rainwater RW is disposed between the pump 35 and the rainwater treatment tank 39.

  The outer pipe 31 is a pipe that allows rainwater RW to flow inside. The outer pipe 31 is typically a flexible polyethylene corrugated pipe, but other hard vinyl chloride pipes, fume pipes, etc. may be used. The outer tube 31 is preferably made of a material having excellent corrosion resistance. The nominal diameter of the outer tube 31 is typically 80A or more, but may be smaller (for example, 65A or less). The outer tube 31 is disposed inside the rainwater storage tank 38.

  The pair tube 32 allows the heat medium MW as the second fluid to flow inside. The heat medium MW is typically water, but may be a liquid that can be another heat medium. The pair tubes 32 flow the heat medium MW in a direction opposite to the flow direction of the rainwater RW in the outer pipe 31, and the parallel pipe 33 that flows the heat medium MW in the same direction as the flow direction of the rainwater RW flowing in the outer pipe 31. And an opposing tube 34. One end of the parallel pipe 33 and one end of the counter pipe 34 are typically continuous in the outer pipe 31, and the heat medium MW can flow continuously between the parallel pipe 33 and the counter pipe 34. It is configured to be able to. The other end of the parallel pipe 33 (the end opposite to the end connected to the counter pipe 34) and the other end of the counter pipe 34 (the end opposite to the end connected to the parallel pipe 33) are The external conduit 92 is connected to the external conduit 92, and the external conduit 92 is connected to a device (for example, a fan coil) that uses cold and hot heat.

  The pair tube 32 is used with a nominal diameter of about 10A to 50A per one (each of the parallel pipe 33 and the counter pipe 34) according to the flow rate of the heat medium MW flowing inside, but other sizes are used. May be used. As the pair tube 32, a synthetic resin tube having flexibility such as a cross-linked polyethylene tube or a polybden tube is typically used. When a material having flexibility is used, workability can be improved. The pair tube 32 may be a metal tube such as a copper tube having a relatively high heat transfer coefficient. However, it is preferable to use a synthetic resin pipe having flexibility from the viewpoint of improving corrosion resistance and workability.

  The pair tube 32 may be configured such that the parallel tube 33 and the counter tube 34 are in contact with each other, or may be configured to be separated from each other. Further, a portion where the parallel tube 33 and the counter tube 34 of the pair tube 32 are continuous (folded portion 32e) may be formed by bending one tube, and the parallel tube 33 using a U-shaped joint. And the opposite pipe 34 may be connected. The pair tube 32 is disposed inside the outer tube 31. The pair tube 32 is disposed inside the outer tube 31 by inserting the folded portion 32 e from one opening end of the outer tube 31. Thus, since the pipe | tube which flows the heat medium MW is made into the pair tube, it becomes possible to insert from one of the opening ends of the outer pipe | tube 31, and construction becomes easy. When the pair tube 32 is disposed in the outer tube 31, a rain (RW) is present around the entire pair tube 32 by attaching a spacer (not shown) to the pair tube 32 at an appropriate interval. It is preferable to do.

  The pump 35 is a pump that pumps the rainwater RW that has flowed through the outer pipe 31 to the treatment tank 39 via the pumping pipe 36. An outer pipe 31 is connected to the suction port of the pump 35, and a pressure feeding pipe 36 is connected to the discharge port. The pump 35 is typically disposed outside the rainwater storage tank 38, but may be disposed within the rainwater storage tank 38.

  The rainwater storage tank 38 is typically a box-shaped water tank provided at a height lower than the ground surface, but may be other than this, for example, an FRP water tank provided on the ground surface. The rainwater flowing into the rainwater storage tank 38 typically collects rain that has reached the ground surface via a rainwater pipe (not shown) and is guided to the rainwater storage tank 38. The rainwater storage tank 38 itself may be configured to collect rainwater by opening.

  With continued reference to FIG. 3, the operation of the waste heat recovery system 40 will be described. When the pump 35 is activated, the rainwater RW stored in the rainwater storage tank 38 flows into the outer pipe 31. The rainwater RW that has flowed into the outer pipe 31 is pumped to the rainwater treatment tank 39 by the pump 35. When the rainwater RW flows in the outer pipe 31, the heat medium MW in the pair tube 32 is caused to flow by a pump (not shown) different from the pump 35. Thereby, heat exchange is performed between the rainwater RW flowing in the outer tube 31 and the heat medium MW flowing in the pair tube 32. At this time, since the rainwater RW flowing in the outer pipe 31 is caused to flow by the pump 35, the length of the pair tube 32 required to recover the same amount of heat as compared with the case of heat exchange with non-flowing rainwater is reduced. It can be shortened and pressure loss can be reduced. The rainwater RW is mixed with sand or other sandy matter (solid matter), but the diameter of the outer pipe 31 is sufficiently larger than the size of the sandy substance (that is, the outer pipe 31 is blocked by the sandy substance). Therefore, the heat exchange can be performed without blocking the rainwater flow path as in the case of heat exchange using a plate heat exchanger.

  The rainwater RW flowing through the outer pipe 31 and exchanging heat with the heat medium MW is guided to the rainwater treatment tank 39 through the pressure feed pipe 36 and filtered, and then used as intermediate water. On the other hand, the heat medium MW that has flowed through the pair tube 32 and recovered heat from the rainwater RW is guided to a heat utilization device (for example, a fan coil (not shown)) and used, and then again the pair tube 32 in the outer tube 31. Then, heat exchange is performed with the rainwater RW.

  In the above description, the waste heat recovery system 40 has been described as a system that recovers the heat of rainwater. However, the waste heat recovery system 40 is constructed as a system that recovers the heat of seawater and river water other than rainwater, or a system that recovers the heat of snow. May be.

It is a perspective view which shows the concept of an air conditioning system provided with the heat exchanger which concerns on embodiment of this invention. FIG. 2 is a detailed view of part A in FIG. 1. It is a conceptual diagram of the waste heat recovery system which concerns on a reference example .

Explanation of symbols

10, 30 Heat exchangers 11, 31 First conduits 12, 32 Second conduits 13, 33 Parallel tubes 14, 34 Opposite tubes 15, 35 Conveying equipment 20 Air conditioning system 38 Storage tank 40 Waste heat recovery system CA, RW 1 fluid CH, MW 2nd fluid G heat source R air conditioning space

Claims (5)

A first conduit forming a circulation flow path in which a first fluid flows in one direction;
A transport device for flowing the first fluid in the first conduit ;
A second conduit disposed inside the first conduit along a direction in which the first conduit extends, and flowing a second fluid that exchanges heat with the first fluid;
An insertion hole is formed in the first conduit;
The second conduit has a parallel pipe that allows the second fluid to flow in the same direction as the flow direction of the first fluid, and a counterflow that causes the second fluid to flow in a direction opposite to the flow direction of the first fluid. The parallel pipe and the counter pipe are continuous, and the parallel pipe and the counter pipe pass through the same insertion hole and are opposite to the continuous ends of the parallel pipe and the counter pipe The first conduit is configured such that a side end thereof is guided out of the first conduit , and the continuous ends of the parallel tube and the counter tube return to the insertion hole. Disposed within ;
Heat exchanger. The second conduit is formed of a flexible material;
The heat exchanger according to claim 1.   The first conduit is embedded in floor concrete;
  The heat exchanger according to claim 2. The first fluid is air;
The transport device comprises an air amplifier that supplies compressed air into the first conduit and sucks and delivers the air that was in the first conduit;
Heat exchanger according to any one of claims 1 to 3. The heat exchanger according to any one of claims 1 to 4 , wherein the heat exchanger is disposed adjacent to a space for cooling or heating;
The second conduit is connected to a heat source that regulates the temperature of the second fluid;
Air conditioning system.

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