JP7107769B2 - heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchange device that exchanges heat with a heat medium on the user side using groundwater, river water, or the like as heat source water, and more specifically, to a technique for improving the heat exchange efficiency.

In Patent Document 1, a planar flexible planar heat exchanger (heat exchange sheet) is used as a heat exchanger, and heat exchange is performed in a water tank that stores groundwater (heat source water) pumped from a well. A heat exchange device is described in which a sheet is rolled up in a spiral shape and immersed, and a heat medium on the user side is circulated through the heat exchange sheet to exchange heat between groundwater and the heat medium on the user side.

In this type of heat exchange device, in order to cause convection in the water storage tank, a groundwater supply hose is routed to the bottom of the tank and a water supply pump is operated to supply groundwater from the bottom of the tank, but the water supply is stopped. Sometimes it is necessary to keep convection flowing.

Therefore, in the invention described in Patent Document 1, in order to prevent the convection from being interrupted even when the water supply is stopped, and for the purpose of further promoting the convection even during the water supply, the air supply hose is attached to the bottom of the water tank. The blower blows compressed air from the bottom of the tank through an air supply hose.

According to this, convection occurs in the water tank as the air bubbles ejected from the bottom of the water tank rise, but there is still room for improvement. In other words, in order to further improve heat exchange efficiency, it is preferable to promote convection along the heat exchange surface, but this point is not taken into consideration.

In particular, when a flexible heat exchange sheet is rolled into a spiral shape, the elastic restoring force of the sheet causes the adjacent inner and outer layers to adhere to each other, making it difficult for air bubbles to pass between them. not.

As another problem, in the conventional device, the water supply hose for groundwater, the air supply hose for compressed air, and the spirally rolled heat exchange sheet are stored separately in the water storage tank.・The installation work is complicated, and there is room for improvement in this respect as well.

JP 2016-133232 A

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to improve heat exchange efficiency in a heat exchange apparatus having an air ejection means for generating convection in a water tank by causing air bubbles to rise along the heat exchange surface of the heat exchanger. It is in.

In order to solve the above-mentioned problems, the invention according to claim 1 provides a water tank in which heat source water such as groundwater is stored , a heat exchanger in which a heat medium on the user side is circulated and immersed in the water tank , an air blowing means for blowing air along the heat exchange surface of the heat exchanger in the water tank, wherein the heat exchanger includes a first end pipe on a heat medium inflow side and a second end pipe on a heat medium outflow side. A planar heat exchanger is used in which a plurality of flexible heat exchange tubes are connected in parallel between end tubes, and a plurality of air ejection means are formed at predetermined intervals. An air supply hose having air ejection holes is used, the planar heat exchanger and the air supply hose are stored in the water tank while being spirally wound, and the planar heat exchanger is adjacent to the a plurality of spacer pipes disposed between the inner layer and the outer layer, each spacer pipe having a leg projecting downward from the bottom of the planar heat exchanger; In a heat exchange device in which the air supply hose is supported, air is jetted from the air jetting hole toward the space between the layers, and heat is exchanged between the heat source water and the heat medium,
Further comprising a heat source water supply hose connected to a water supply pump, the heat source water supply hose having a plurality of water ejection holes formed at predetermined intervals, and the heat source water supply hose being connected to the leg together with the air supply hose. It is characterized in that the heat source water is spouted from the water spout hole toward the space between the layers .

The invention according to claim 2 is characterized in that, in claim 1 , the heat source water supply hose is arranged between the planar heat exchanger and the air supply hose.

The invention according to claim 3 comprises a water tank in which heat source water such as groundwater is stored, a heat exchanger in which a heat medium on the user side is circulated and immersed in the water tank, and the heat exchange in the water tank. A fin-type heat exchanger in which a plurality of fins are attached to a heat medium flow tube through which the heat medium on the user side flows as the heat exchanger. An air supply hose having a plurality of air ejection holes formed at predetermined intervals is used as the air ejection means, and the fin heat exchanger has the heat exchange surfaces of the fins substantially vertical. and the air supply hose is arranged below the fin-type heat exchanger so as to blow air along the heat exchange surface of the fin,
Further comprising a heat source water supply hose having a plurality of water ejection holes formed at predetermined intervals and connected to the water supply pump, wherein the heat source water supply hose is arranged between the air supply hose and the finned heat exchanger. It is characterized by being

The invention according to claim 4 is characterized in that in claim 1 or 3, a hose for drip irrigation is used as the air supply hose.

According to the present invention, at the bottom of a heat exchanger (which may be a finned heat exchanger, but is preferably a flexible planar heat exchanger), air is blown along its heat exchange surface. By providing the jet means, convection along the heat exchange surface is promoted, and the heat exchange efficiency is further increased.

In addition, by integrally providing the air ejection means (air supply hose) preferably including the heat source water supply hose at the bottom of the heat exchanger, the workability of carrying and installing the heat exchanger into the water tank is greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram which shows the structure of the heat-exchange apparatus which concerns on 1st Embodiment of this invention. The typical top view in FIG. 1 of the said heat-exchange apparatus. The perspective view which shows the principal part of the said heat-exchange apparatus. FIG. 2 is a perspective view showing a flat heat exchange sheet applied to the heat exchange device; The perspective view which shows another example of the said flat heat-exchange sheet. FIG. 4 is a perspective view showing a heat exchange device including a heat exchanger with fins according to a second embodiment of the present invention; FIG. 4 is a schematic diagram showing a first piping connection example of the air supply hose. FIG. 5 is a schematic diagram showing a second pipe connection example of the air supply hose. FIG. 4 is a schematic diagram showing a first pipe connection example when a drip irrigation hose is used as an air supply hose. FIG. 4 is a schematic diagram showing a second pipe connection example when a drip irrigation hose is used as the air supply hose.

Next, an embodiment of the invention will be described with reference to FIGS. 1 to 5, but the invention is not limited thereto.

1 and 2, a heat exchange device 1 according to this embodiment (first embodiment) basically includes a water tank 10 and a heat exchanger 20 housed in the water tank 10. , heat source water supply means 30 for supplying heat source water into the water tank 10, and air ejection means 40 for positively causing convection.

The water tank 10 may be a water tank excavated in the ground or a water tank installed on the ground surface. A portion of a river may also be used. In this embodiment, the water storage tank 10 is used as a water storage tank.

The heat exchanger 20 may be a metallic fin-type heat exchanger as in the second embodiment described later. A planar heat exchanger 21 is adopted in which a plurality of heat exchange tubes 213 are connected in parallel between a first end pipe 211 on the heat medium inflow side and a second end pipe 212 on the heat medium outflow side. ing. The first end pipe 211 has a heat carrier inlet at its lower end, whereas the second end pipe 212 has a heat carrier outlet at its upper end.

Each heat exchange tube 213 communicates with a first end pipe 211 and a second end pipe 212, and a heat medium is supplied from a user-side device (not shown) to the first end pipe 211 and flows through each heat exchange tube 213. While flowing toward the second end pipe 212 , the water exchanges heat with the heat source water, and is returned from the second end pipe 212 to the utilization side equipment.

The heat exchange tubes 213 may be flexible synthetic resin tubes such as polyethylene tubes. As an example, the heat exchange tube 213 is a tube of 6 mm in diameter and 5.6 m in length, and 117 tubes between the end tubes 211 and 212 are arranged parallel to each other at equal intervals by the beam members 214, and are apparently one sheet. The planar heat exchanger 21 is also called a heat exchange sheet because of its shape, and the planar heat exchanger 21 may be hereinafter referred to as a heat exchange sheet.

In this embodiment, the heat exchange sheet 21 is rolled into a spiral shape as shown in FIG. A cylindrical heat exchange sheet 21 that is rolled up is called a basket type.

When the heat exchange sheet 21 is rolled into a spiral, the elastic restoring force of the heat exchange tubes 213 brings the adjacent inner and outer layers into close contact with each other, making it difficult for convective water to pass between the layers.

Therefore, in this embodiment, when the heat exchange sheet 21 is rolled into a spiral shape, a plurality of spacer pipes 23 made of, for example, PVC pipes are interposed between the adjacent inner and outer layers at appropriate intervals so that the adjacent A gap is formed between the inner layer and the outer layer.

The outer diameter of the spacer pipe 23 may be arbitrarily selected, but the length (axial length) is greater than the width of the heat exchange sheet 21, and as shown in FIGS. It has a leg 231 projecting downward from the bottom of 21 .

The heat exchange sheet 21 having a basket-shaped cylindrical shape is installed in the water tank 10 vertically, that is, with its axis substantially vertical (the heat exchange surface including the plurality of heat exchange tubes 213 is substantially vertical). placed in

The first end pipe 211 on the heat medium inflow side and the second end pipe 212 on the heat medium outflow side are connected to the primary side of, for example, a heat pump provided in the utilization side equipment (not shown). The heat medium on the user side is flowed so as to circulate.

In this embodiment, a heat source water supply hose 31 is used as the heat source water supply means 30 . 2 and 3, the heat source water supply hose 31 has a spiral shape similar to that of the heat exchange sheet 21, passes through the leg portions 231 of the spacer pipes 23, and extends to the bottom side of the water tank 10. It is supported substantially horizontally by the portion 231 .

A plurality of water ejection holes 311 are formed at predetermined intervals on the upper surface of the heat source water supply hose 31 (the surface facing the bottom side of the heat exchange sheet 21). In this embodiment, the heat source water is supplied to the heat source water supply hose 31 through the connecting pipe 32 from the water supply pump P1. The heat source water to be supplied can be exemplified by groundwater (well water), river water, industrial wastewater, agricultural water, spring water, and the like.

A drain pipe 33 having a drain pump P2 is drawn out from the top of the water tank 10 . When the upper limit level of the heat source water is detected by a float switch (not shown), the drain pump P2 starts operating to drain excess heat source water. It should be noted that the excess heat source water may be drained by an overflow method instead of using the drain pump P2.

In this embodiment, an air supply hose 41 is used as the air ejection means 40 . 2 and 3, the air supply hose 41 has a spiral shape similar to that of the heat exchange sheet 21, passes through the legs 231 of the spacer pipes 23, and feeds the heat source water on the bottom side of the water storage tank 10. It is substantially horizontally supported by the leg portion 231 below the supply hose 31 .

A plurality of air ejection holes 411 are formed at predetermined intervals on the upper surface of the air supply hose 41 (the surface facing the bottom side of the heat exchange sheet 21). Compressed air is supplied from the blower P3 to the air supply hose 41 through the connecting pipe 42 .

The heat source water supply hose 31 and the air supply hose 41 are arranged so as to overlap vertically as shown in FIG. The hose 31 is arranged on the upper side and the air supply hose 41 is arranged on the lower side, but in some cases, the air supply hose 41 may be arranged on the upper side and the heat source water supply hose 31 may be arranged on the lower side.

According to this heat exchange device 1, the heat source water supplied from the water supply pump P1 is discharged from the water ejection holes 311 of the heat source water supply hose 31 to the inner layer of the heat exchange sheet 21, which is kept at intervals by the spacer pipes 23 of the heat exchange sheet 21. and the outer layer.

Compressed air supplied from the blower P3 is also supplied to the gap between the inner layer and the outer layer of the heat exchange sheet 21, which are kept spaced apart by the spacer pipes 23, from the air ejection holes 411 of the air supply hose 41. sprayed towards.

As a result, a large convection occurs in the water tank 10 between the adjacent inner and outer layers of the heat exchange sheet 21, so that the heat exchange rate between the heat source water and the heat medium on the user side is greatly increased.

Moreover, since both the heat source water supply hose 31 and the air supply hose 41 are supported by the legs 231 of the spacer pipe 23, the heat exchange sheet 21, the heat source water supply hose 31, and the air supply hose 41 are used as one heat exchange unit. It can be housed in the water tank 10, and the workability of carrying in and installing in the water tank 10 is greatly improved.

As another example of the first embodiment, as shown in FIG. 5, an air supply hose 41 is placed along the lower side of a heat exchange sheet (planar heat exchanger) 21 and suspended by a beam member 214, for example. The heat exchange sheet 21 having such an air supply hose 41 is also included in the present invention.

The heat exchange sheet 21 having the air supply hose 41 has a heat exchange surface (a virtual plane including a plurality of heat exchange tubes 213 arranged so as to be parallel to each other) with the air supply hose 41 on the lower side and a substantially vertical plane. Provided that it is placed vertically, it can be used in a straight state, a zigzag bent state, or a spirally rolled state as in the above embodiment.

In any case, the air supply hose 41 ejects compressed air as air bubbles from below along the heat exchange surface of the heat exchange sheet 21, promoting convection of the heat source water along the heat exchange surface. Heat exchange between the heat source water and the heat medium on the user side is efficiently performed. In addition, since the air supply hose 41 is attached to the heat exchange sheet 21, it is easy to carry in and install in the water tank.

Next, a second embodiment of the present invention will be described with reference to FIG. In this second embodiment, a finned heat exchanger 25 is used as the heat exchanger 20 .

The finned heat exchanger 25 illustrated in FIG. 6 is a heat exchanger that is frequently used in an air conditioner or the like, in which a plurality of fins 252 made of strip-shaped metal plates are attached to a heat medium flow pipe 251 through which a heat medium on the user side flows. Although it has the same form as the heat exchanger, it may be a heat exchanger in the form of an oil heater used as a heater or an automobile radiator.

The finned heat exchanger 25 is immersed in the water tank so that the heat exchange surface (flat plate surface) of the fins 252 is substantially vertical, and below it, an air ejection means is formed at a predetermined interval. An air supply hose 41 having a plurality of air ejection holes 411 is arranged.

The air supply hoses 41 are preferably arranged, for example, in a zigzag pattern so that air bubbles are directed toward the finned heat exchanger 25 substantially uniformly within the projected area of the finned heat exchanger 25 .

Although not shown in FIG. 6, in the second embodiment as well, the heat source water supply hose 31 having a plurality of water ejection holes 311 formed at predetermined intervals is used as in the first embodiment. good too. In this case, the heat source water supply hose 31 is preferably arranged above the air supply hose 41 , that is, between the air supply hose 41 and the finned heat exchanger 25 .

In FIG. 6, the heat exchanger 25 with fins is placed in the water tank with the short sides of the strip-shaped fins 252 substantially vertical and the long sides substantially horizontal. It may be placed in the water tank in a vertically raised state in which the long side is substantially vertical and the short side is substantially horizontal.

Also, the air supply hose 41 and/or the heat source water supply hose 31 may be connected to the finned heat exchanger 25 via a connector (not shown) to form a unit.

In any case, according to the heat exchange device of the present invention, by providing the air blowing means for blowing air along the heat exchange surface of the heat exchanger, convection along the heat exchange surface is promoted, and the heat exchange rate is is enhanced.

2 and 5, of the two ends of the air supply hose 41, the tip (one end) is closed with a closure cap (not shown) or the like, and the rear end (the other end) is connected to the connecting pipe 42 from the blower P3. , the amount of air ejected from the air ejection holes 411 gradually decreases from the rear end on the connection side to the closed tip, and convection to the heat exchange sheet 21 is biased.

Therefore, in the case where the air supply hose 41 shown in FIG. 2 is arranged in a spiral shape along the cylindrically wound heat exchange sheet 21, as shown in FIG. Both ends of the air supply hose 41 are connected to the first connection port 51a and the second connection port 51b, and the connecting pipe 42 from the blower P3 is connected to the third connection port 51c, which is a branch port.

Also in the case of the embodiment in which the air supply hose 41 shown in FIG. Both ends of the air supply hose 41 are connected to the first connection port 51a and the second connection port 51b, and the connecting pipe 42 from the blower P3 is connected to the third connection port 51c, which is a branch port.

According to this, since compressed air is supplied from both ends of the air supply hose 41, the amount of air ejected from the large number of air ejection holes 411 is substantially uniform. The connection work is also time-consuming.

Especially when the air supply hoses 41 are arranged in multiple rows as shown in FIG. As an example, when the air supply hoses 41 are arranged in two rows as shown in FIG. 8, three cheese-shaped pipe joints 51 are required.

In order to improve this point, as another embodiment, the air supply hose 41 uses a drip (drip) irrigation hose (also called drip irrigation tube, drip tube, etc.). 9 and 10 show examples in which a drip irrigation hose 45 is used in place of the air supply hose 41.

The drip irrigation hose 45 has a built-in water pressure control emitter in each spout 451 that is opened at predetermined intervals, and drips approximately the same amount of water for plant cultivation from each spout 451 (drip irrigation). .

Thus, although the drip irrigation hose is originally for sprinkling water, the water pressure control emitter functions similarly for air. When compressed air was supplied, substantially the same amount of jetted air was obtained from each of the water outlets 451 (air jet outlets 411).

In the case of the drip irrigation hose 45, it is not necessary to connect both ends to the connection pipe 42 from the blower P3, and as shown in FIG. It may be connected to the connecting pipe 42 from the blower P3 via a socket type pipe joint 52.

Further, as shown in FIG. 10, even when the drip irrigation hoses 45 are arranged in multiple rows (two rows in this example), the other end 453 of one of the drip irrigation hoses 45A is the first The other end 453 of the other drip irrigation hose 45B is connected to the second connection port 51b, and the connection pipe 42 from the blower P3 is connected to the third connection port 51c. Compared to the connection example of FIG. 8, the number of cheese type pipe joints 51 can be reduced by two.

Documents related to drip irrigation hoses include, for example, JP-A-2010-46094, JP-A-2018-46770, and JP-A-2018-82652.

In addition, commercially available products include a drip tube manufactured by NETAFIM, Streamline 60/80, Spar Typhoon 100, Unilam RC (all trade names), Hi-Tape drip tube (trade name) manufactured by Iritek, and Green. There is a drip tube (trade name) manufactured by Com Co., Ltd., and the like.

As a drip irrigation hose that does not rely on a water pressure control emitter, there is a safety irrigation tube (trade name) manufactured by Takiron C.I., which employs a laser hole. Such a drip irrigation hose can also be used as an air supply hose for generating convection.

1 heat exchange device 10 water tank 20 heat exchanger 21 planar heat exchanger (heat exchange sheet)
211, 212 end pipe 213 heat exchange tube 23 spacer pipe 231 leg 25 finned heat exchanger 251 heat source water channel pipe 252 fins 30 heat source water supply means 31 heat source water supply hose 311 water jet hole 33 drain pipe 40 air jet means 41 Air supply hose 411 Air ejection port 45 Drip irrigation hose P1 Water supply pump P2 Drainage pump P3 Blower

Claims (4)

A water tank in which heat source water such as groundwater is stored, a heat exchanger in which a heat medium on the user side is circulated and immersed in the water tank, and along the heat exchange surface of the heat exchanger in the water tank air blowing means for blowing air, and the heat exchanger includes a plurality of flexible heat exchangers between a first end pipe on a heat medium inflow side and a second end pipe on a heat medium outflow side. A planar heat exchanger formed by connecting tubes in parallel is used, and an air supply hose having a plurality of air ejection holes formed at predetermined intervals is used as the air ejection means, and the planar heat is The exchanger and the air supply hose are stored in the water tank in a spirally wound state, and the planar heat exchangers are arranged between adjacent inner and outer layers. Each spacer pipe has a leg projecting downward from the bottom of the planar heat exchanger. In a heat exchange device that blows air toward and exchanges heat between the heat source water and the heat medium,
Further comprising a heat source water supply hose connected to a water supply pump, the heat source water supply hose having a plurality of water ejection holes formed at predetermined intervals, and the heat source water supply hose being connected to the leg together with the air supply hose. A heat exchange device, wherein the heat source water is spouted from the water spout hole toward the space between the layers . 2. The heat exchange device according to claim 1, wherein the heat source water supply hose is arranged between the planar heat exchanger and the air supply hose . A water tank in which heat source water such as groundwater is stored, a heat exchanger in which a heat medium on the user side is circulated and immersed in the water tank, and along the heat exchange surface of the heat exchanger in the water tank and an air blowing means for blowing air,
As the heat exchanger, a fin-type heat exchanger is used in which a plurality of fins are attached to a heat medium flow tube through which the heat medium on the user side flows, and the air ejection means is formed at predetermined intervals. The fin-type heat exchanger is immersed in the water tank with the heat exchange surface of the fins being substantially vertical, and the air supply hose is used to dissipate the heat of the fins. In the heat exchange device arranged below the fin-type heat exchanger so as to blow air along the exchange surface,
Further comprising a heat source water supply hose having a plurality of water ejection holes formed at predetermined intervals and connected to the water supply pump, wherein the heat source water supply hose is arranged between the air supply hose and the finned heat exchanger. A heat exchange device characterized by: 4. The heat exchange device according to claim 1 , wherein a drip irrigation hose is used as the air supply hose.

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