JP5191768B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchange device for exchanging heat between ground water or underground warm water and air.

  The groundwater referred to in the present invention is relatively low temperature (temperature less than 25 ° C.) as compared with underground hot water described later, and can be used for cooling or heating assistance. Moreover, the underground hot water is relatively hot (temperature of 25 ° C. or higher) compared to the ground water and can be used for heating. Below, unless otherwise specified, both are collectively referred to as groundwater.

  As one means for avoiding global warming, for example, as seen in Patent Document 1, an air conditioning system that uses a heat exchange device that exchanges heat between groundwater and the like and air is constructed to reduce power consumption. Has been proposed. The air conditioning system of Patent Document 1 has a configuration in which a heat exchange device is installed in an underfloor space or a ceiling space in a residential area, and a heat pump is connected to the heat exchange device, and groundwater as a refrigerant is circulated through the heat pump. The reason for using a heat pump is that it is easier to maintain and simplify the circulation route in the house by pumping the groundwater to the heat pump and using only heat for air conditioning than pumping the groundwater and circulating it throughout the house. .

  Groundwater and the like are maintained at a substantially constant temperature throughout the year, but heat exchange can only be performed within a temperature difference range from the air temperature, and thus, for example, a room cannot be rapidly cooled or heated. For this reason, it is also advantageous to use only heat extracted from groundwater or the like by a heat pump as in Patent Document 1. However, since groundwater or the like is a heat exchange medium having a sufficient capacity, it can be considered as a heat exchange medium as means for keeping the room temperature constant by slowly cooling or warming the room over a long period of time. Patent Document 2 proposes an air conditioning system using a heat exchange device that exchanges heat between room air and groundwater.

  In the heat exchange device disclosed in Patent Document 2, a relatively large-diameter resin pipe (trunk) is used as an air path, and a relatively small-diameter resin pipe (pipe section) is folded back as a water path. For example, it is installed in an attic space of a room to be air-conditioned. Groundwater, etc. is pumped up from the basement by a pump, discharged to the outdoors after passing through the water path. Air is sent to the air path by convection using a blower provided in one of a pair of ducts that connect the attic space where the heat exchange device is installed and the room, and is discharged to the attic space after heat exchange. The heat-exchanged air is first supplied to the room through a duct while cooling the attic space to reduce the radiant heat from the attic space, and the room is cooled if the outside temperature is high, and conversely if the outside temperature is low, the room is cooled. Heat up.

  The heat exchange device disclosed in Patent Document 2 is assumed to be a metal pipe instead of a resin pipe. However, when the pumped-up groundwater or the like is allowed to flow through the water path as it is, scum is generated in the metal pipe, the flow resistance is increased, the pump is loaded, and there is a risk of rusting. From this, when it is assumed that groundwater or the like is used, it is preferable to configure the heat exchange device with a resin pipe. In addition, heat exchange devices using resin pipes can be manufactured at lower costs and are lighter than heat exchange devices using metal pipes. This is preferable.

JP 2005-207704 A JP 2007-085679 A

  The heat exchanging device disclosed in Patent Document 2 limits the range in which heat can be exchanged by the water path through which groundwater flows, etc., to the inside of the air path, and makes the heat capacity of the groundwater and the air in the heat exchanging range as similar as possible. To improve the heat exchange efficiency. However, the amount of air that can be heat exchanged is limited to the extent that a relatively small diameter resin pipe is folded and housed in an air path composed of a relatively large diameter resin pipe, and the attic space and thus the room is cooled or heated. It was difficult to exchange enough heat for the air. For this reason, for example, on an extremely hot day or a severe winter day, an air conditioning system using a heat exchanging device constituted by a resin pipe cannot sufficiently cope with it.

  As a countermeasure, it is conceivable to heat-exchange necessary and sufficient air by lengthening the air path or arranging a large number of heat exchange devices. However, lengthening the air path only increases the weight of a single heat exchange device and does not greatly improve the heat exchange efficiency. Installing a large number of heat exchange devices only leads to an increase in the weight of the total number of heat exchange devices with respect to the installation location, and does not greatly improve the heat exchange efficiency. Therefore, we examined the development of a heat exchange device that greatly improved the heat exchange efficiency while using the pumped groundwater as it is and using resin pipes.

Parallel those developed result of the examination is, in the heat exchanger for heat exchange between the groundwater and the air, the resin or metal heat exchanger vessel was opened outlet and inlet communicating, folding or which are It is configured to contain a resin heat exchange pipe meandering so that the central axis of each straight pipe portion coincides with each corner of the regular triangle in a side view , and the heat exchange container is provided with a fan at the discharge port the flow of air towards the outlet from the inlet port to form Te, the heat exchange pipe is formed directly in the flow groundwater pumped toward the other from one of said open ends to connect the pump to one of the open end Heat exchanger. The fan is preferably a cross fan with low power consumption per air volume.

  In the heat exchange device of the present invention, the heat exchange pipe is made of resin in order to suppress generation of scum and rusting due to groundwater or the like. The heat exchange pipe made of resin is easy to process, suppresses generation of scum and rusting, and has excellent durability. And the area (heat-transfer area) which contacts air is increased by folding the said heat exchange pipe and making it meander. In addition, by folding a single heat exchange pipe and meandering, the flow rate of groundwater can be increased while reducing the amount of groundwater flowing through the heat exchange pipe, compared to the case where many heat exchange pipes are parallel. Thus, if the flow rate of groundwater is increased while increasing the heat transfer area, the surface heat transfer coefficient of the inner surface of the heat exchange pipe is increased, and the heat transfer performance can be improved.

  Further, if the folded pipe portion connecting the end portions of the straight pipe portions is made smaller, the gap between the straight pipe portions can be made smaller and the density of the straight pipe portions can be increased. Thereby, even if the quantity of the air which flows through the inside of a heat exchange container is constant, the flow velocity of air can be made quick, the surface transfer coefficient of a heat exchange pipe outer surface can be enlarged, and heat transfer performance can be improved. Furthermore, if the density of the straight pipe portion can be increased, the heat transfer area can also be increased, and the advantage that the heat exchange device can be reduced in size while improving the heat exchange efficiency can be obtained, and the heat exchange device of the present invention is installed. More places are possible. An example of the small folded pipe portion is a U-shaped joint in which a pair of resin elbow pipes are joined by chemical fusion via a short resin straight pipe.

  Although the cross-sectional shape of the heat exchange container is free, it is desirable that the heat exchange container be a rectangular parallelepiped from the viewpoint of storing the heat exchange pipe that is folded and meandered so as to fill the inside of the heat exchange container. In addition, the heat exchange pipe may be folded and meandered, but it is preferable that the heat exchange pipe is folded and meandered in a straight line with the air flow in the heat exchange container. For example, if the air flow in the heat exchange container is in the left-right direction, the resin pipe is folded in the up-down direction to meander. In addition, the heat exchange container is provided with a discharge port at the top and a suction port at the bottom to form a bottom-to-top air flow from the suction port to the discharge port, and the heat exchange pipe flows through the upper open end. The inlet and the lower open end are used as outlets, and a flow of groundwater and the like from the inlet to the outlet is formed from the inlet to the outlet.

  The heat exchange pipe is preferably meandered so that the central axis of each straight pipe portion of the heat exchange pipe that is folded in parallel and coincides with each corner of the regular triangle in side view. This maximizes the total cross-sectional area of the straight pipe portion of the heat exchange pipe relative to the cross-sectional area of the heat exchange vessel. In addition, when the air flow is constant, air turbulence on the surface of each straight pipe portion is reduced. It becomes maximum, and heat exchange efficiency can be improved.

  The heat exchange containers may be alternately provided with guide plates inclined in the direction of air flow between the straight pipe portions that are folded and parallel to each other. The inclination angle of the guide plate is usually the inclination angle of the copying surface connecting the straight pipe portions of the heat exchange pipe. Here, the guide plate of the present invention refers to a plate formed as it is, but for example, even in a configuration in which a plurality of bars are arranged, the copying surface of each bar is inclined in the direction of air flow. If so, the arranged bars correspond to the guide plate according to the present invention. The guide plate meanders the flow of air and increases the speed at which air passes near the heat exchange pipe.

  However, although the guide plate meanders the air flow, the air does not hit the immediate edge pipe portion of the heat exchange pipe hidden behind the guide plate. Therefore, a slit may be provided in the guide plate in order to apply air to the straight edge pipe portion of the heat exchange pipe hidden behind the guide plate. The length and width of the slit, the shape of the opening, and the number are arbitrary, but usually a rectangular opening perpendicular to the inclination direction of the guide plate, and one slit having a length over the width of the guide plate or A configuration in which two to three are provided can be exemplified.

  According to the present invention, it is possible to provide a heat exchange device that increases the heat exchange rate with air while using a resin pipe as a heat exchange pipe for flowing groundwater or the like. This is a configuration in which a heat exchange pipe folded by folding a resin pipe in a heat exchange container is stored, and heat exchange is performed between air flowing in the heat exchange container and groundwater flowing in the heat exchange pipe. It is an effect based on. As described above, the present invention has an effect of enhancing the practicality of a heat exchange device using a resin pipe as a heat exchange pipe. In addition, the heat exchange pipe is made of resin, and the folded pipe part is composed of a U-shaped joint using the same resin elbow pipe, so that it is possible to provide a heat exchange device that is easy to process and inexpensive to manufacture. There is also.

  For example, the heat exchange efficiency can be determined by specifying the flow of air from the bottom to the top, the flow of groundwater or the like from the top to the bottom, specifying the positional relationship of the straight pipe portion of the heat exchange pipe, Further improvement can be achieved by providing a guide plate between them and further providing a slit in the guide plate. Thereby, if the heat exchange apparatus of this invention is utilized for the air-conditioning system of patent document 2, it will be able to respond sufficiently to extremely hot days and severe winter days. Further, the improvement of the heat exchange efficiency reduces the power consumption as compared with a conventional heat exchange means, such as a heat pump, used in the air conditioning system in which the present invention is used. This has the effect of reducing the amount of carbon dioxide that is emitted when the same cooling capacity or heating capacity is indirectly exerted.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the heat exchange device 1 to which the present invention is applied, divided in the front-rear direction, FIG. 2 is a cross-sectional view of the heat exchange device 1 of the present example, divided in the left-right direction, and FIG. 4 is a front view of the guide plate 37 provided with slits 371, and FIG. 5 is a cross-sectional view of the folded pipe portion 34 in the heat exchange pipe 3. As shown in FIG. FIG. 3 shows the fan 23 on the heat exchange module 35 for convenience of explanation, and the guide plate 37 is not shown.

  The heat exchange apparatus 1 of this example is the structure which covered the heat exchange container 2 of the rectangular parallelepiped external shape on the heat exchange module 35 which made the heat exchange pipe 3 meander and fold, as FIG. 1-3 shows. In the heat exchange module 35 of this example, guide plates 37 inclined in the direction in which the air A flows are alternately assembled in advance between the support plates 36 so as to face each other. The inlet 31 of the heat exchange pipe 3 is an open left end of the uppermost straight pipe portion 33, and the outlet 32 is an open left end of the lowermost straight pipe portion 33. From now on, groundwater W etc. are flowing from top to bottom as a whole while reversing the direction of flow.

In the heat exchange pipe 3, the straight pipe portion 33 and the folded pipe portion 34 are both made of resin (for example, PVC pipe). This is because the groundwater or the like W pumped up in the heat exchange pipe 3 is allowed to flow as it is , so that scum and rust are not generated in the heat exchange pipe 3, and the performance effect of improving durability and the processing of the heat exchange pipe 3 are easy. Thus, an economic effect of reducing the manufacturing cost is brought about. In the heat exchange module 35, the straight pipe portion 33 is passed through the through holes 361 provided in the pair of left and right support plates 36, 36, and the heat exchange pipe 3 is kept meandering and folded. Here, as seen in the enlarged portion in FIG. 2, each straight pipe portion 33 is arranged such that its center axis coincides with each corner of the regular triangle in side view. As a result, the total cross-sectional area of the straight pipe portion 33 of the heat exchange pipe 3 relative to the cross-sectional area of the heat exchange vessel 2 can be maximized, and the air A on the surface of each straight pipe portion 33 when the flow of air A is constant. Turbulent flow is maximized to improve heat exchange efficiency.

  The heat exchange container 2 has a resin frame 25 (for example, a PVC plate material) fitted on a side surface of a metal frame 24 (for example, a stainless steel angle material), and the open bottom surface is a suction port 21 and the open top surface is released. This is a cylindrical container having a rectangular cross section as the outlet 22. The frame 24 may be made of resin, and the panel 25 may be made of metal. The fan 23 in this example uses a cross fan that sucks air A and blows it out in a specific direction, and is built in a fan case 231 that covers the discharge port 22. The fan case 231 has a double structure of an outer case that is continuous with the outer surface of the heat exchange container 2 and an inner case that specifies the flow of air A in the range of the blades of the cross fan that is a fan. Like the heat exchange container 2, the outer case and the inner case are configured by fitting a resin panel in a metal frame. The inner case is provided with an outlet 232 that communicates with the discharge port 22 of the heat exchange container 2 and penetrates the outer case.

  As shown in FIG. 2, the air A is taken into the heat exchange container 2 from the outside through the suction port 21 which is the opened bottom surface by the suction of the fan 23. The air A thus taken into the heat exchange vessel 2 meanders along the guide plate 37 assembled to the heat exchange module 35 as a whole, and directly goes up through a slit 371 provided in a part of the guide plate 37. The heat exchange pipe 3 is sewn and raised, and is sucked into the fan case 231 from the discharge port 22 of the heat exchange container 2 which is the opened upper surface. Then, the fan 23 blows out from the air outlet 232 to the outside. As described above, the heat exchange device 2 of this example is basically placed vertically, and the air A flows from the bottom to the top. However, since the heat exchange container 2 has a rectangular parallelepiped outer shape, the heat exchange device 2 depends on the installation location. May be placed horizontally.

  In this example, a narrow guide plate 37 disposed on the uppermost and lowermost front sides of the heat exchange vessel 2 (the uppermost and lowermost steps on the right side of FIG. 2), and the front and rear sides of the heat exchange vessel 2 respectively. From the bottom to the top, the air A is meandered in the front-rear direction by the wide guide plates 37 arranged so as to protrude alternately. The meandering flow of the air A by the guide plate 37 lengthens the substantial path length through which the air A flows, and increases the passing speed of the air A and the vicinity of the heat exchange pipe 3. The guide plate 37 of this example is provided between the straight pipe portions 33 of the heat exchange pipe 3 to facilitate the assembly of the heat exchange module 35.

  In order to reduce the influence of obstructing the contact between the straight pipe portion 33 located on the upper surface side of the guide plate 37 and the air A with respect to the flow of air A, the wide guide plate 37 can be seen as shown in FIG. The slit 371 is opened. As a result, a part of the air A comes directly upward toward the upper surface side of the guide plate 37 (see the thick broken line arrow extending in the vertical direction in FIG. 2), and the straight pipe portion 33 located on the upper surface side of the guide plate 37. And air A are secured. In the slit 371 of this example, a pair of left and right slits 371 are provided in two rows on the side closer to the root than the half in the width direction of the guide plate 37 (lower side in FIG. 4). The presence / absence of the slit 371 in the guide plate 37 brings the effect of improving the cooling / heating efficiency by allowing the flowing air A to reach the vicinity of the heat exchange pipe 3 at the corner.

  The heat exchange apparatus 1 of this example uses a folded pipe portion 34 having a small folded radius as shown in FIG. 5 to reduce the gap between the straight pipe portions 33, so that the straight pipe per unit volume of the heat exchange vessel 2. The number of parts 33 is increased. The folded pipe portion 34 in this example is obtained by cutting off the bent protruding portion of one end of a pair of resin elbow pipes 341, and bonding the cut ends to each other via a short resin straight pipe 342. It is the U-shaped joint joined by. The straight pipe portion 33 is fitted to the bent other end of the resin elbow pipe 341.

  The heat exchange apparatus 1 of this example is a metal or resin material that is easily available except for the fan 23. In particular, in the heat exchange pipe 3, the straight pipe portion 33 can be configured by only a straight pipe, and the folded pipe portion 34 can be easily processed by an elbow pipe 341 and a straight pipe 342. Thereby, the heat exchange apparatus 1 of this example can be manufactured very inexpensively. This is because in the air conditioning system using the heat exchange device 1 of the present invention, the number of heat exchange devices 1 allocated per unit price of the air conditioning system can be increased, and the more effective air conditioning system can be configured. Become.

It is sectional drawing divided in the front-back direction of an example of the heat exchange apparatus to which this invention is applied. It is sectional drawing parted in the left-right direction of the heat exchange apparatus of this example. It is a perspective view showing the folded state of a heat exchange pipe. It is a front view of the guide plate which provided the slit. It is sectional drawing of the turned-up pipe part in a heat exchange pipe.

Explanation of symbols

1 Heat Exchanger 2 Heat Exchange Container 3 Heat Exchange Pipe W Groundwater A Air

Claims (4)

In a heat exchange device that exchanges heat between ground water or underground warm water and air,
A resin or a metal heat exchanger vessel of the outlet and inlet opened to communicate, meandering central axis of each straight pipe section to be folded or be parallel to match each corner of the side view equilateral triangle It is made up of a heat exchange pipe made of resin,
The heat exchange container is provided with a fan at the discharge port to form an air flow from the suction port to the discharge port,
The heat exchange pipe is characterized in that a pump is connected to one of the open ends, and a flow of the ground water or the underground warm water pumped from one of the open ends to the other is formed. The heat exchange container is provided with a discharge port at the top and a suction port at the bottom, forming a flow of air from bottom to top from the suction port to the discharge port, and the heat exchange pipe has an inlet at the upper open end, The heat exchange device according to claim 1, wherein a flow of underground water or underground warm water from the top to the bottom from the inlet to the outlet is formed with the lower opening end as the outlet. 3. The heat according to claim 1, wherein the heat exchange containers are alternately provided with guide plates inclined in the air flow direction facing each other between the straight pipe portions of the heat exchange pipes that are folded and parallel to each other. Exchange equipment. The heat exchange device according to claim 3 , wherein the guide plate is provided with a slit.