JP2010019448A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geothermal utilization air conditioning system properly applied to a building having a large-scaled space such as a factory building, and capable of removing constrains in utilizing an indoor space. <P>SOLUTION: In this air conditioning system 100 performing air-conditioning inside of the building by introducing the outside air through a geothermal utilization tube 10 buried in the ground E, a supply duct 12 disposed at an upper region inside of the building is connected with the geothermal utilization tube 10, a supply opening 12a of the supply duct 12 is opened to a lower region inside of the building, and the air is released from the supply opening 12a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioning system using geothermal heat, and particularly to an air conditioning system suitable for cooling a building having a large-scale space such as a factory building.

  An example of an air conditioning system that uses geothermal energy to save energy is described in Patent Document 1. In this air conditioning system, the air introduced from the underfloor space is supplied to a geothermal utilization tube buried in the ground, and then discharged to the attic space.

  According to this air conditioning system, heat is exchanged between the air introduced from the underfloor space and the underground in the geothermal utilization tube. Here, since the underground temperature is lower than the outside air temperature in the summer, the temperature of the outside air introduced into the geothermal utilization tube is lowered, and the indoor temperature can be lowered.

  On the other hand, as a geothermal air conditioning system suitable for a large-scale space such as a factory building, the present patent applicant has already provided an air conditioning system shown in Japanese Patent Application No. 2008-124903.

Japanese Patent Publication No. 63-67109

  By the way, in the air-conditioning system of patent document 1, in order to guide the air discharged | emitted to the attic space under the floor, it is necessary to comprise space in the wall of a building. For this reason, when the temperature of a building having a large-scale space such as a factory building is adjusted, the introduction cost is remarkably increased. And the air conditioning system of patent document 1 makes temperature control object the whole building. Therefore, it is not suitable for air conditioning of a building having a large-scale space such as a factory building, and it may be difficult to adjust the room to a desired cooling temperature.

  On the other hand, in the geothermal air-conditioning system of the above-mentioned Japanese Patent Application No. 2008-124903, air-conditioning air outlets are provided on the floor of the pillars, and this outlet becomes an obstacle to the layout of the equipment, There is a risk of restrictions. In addition, when building a machine foundation or pit under the floor in the future, it may be necessary to consider this outlet.

  In view of the above circumstances, an object of the present invention is suitable for a building having a large-scale space such as a factory building, and provides an air conditioning system using geothermal heat that can eliminate restrictions on the use of indoor space. There is to do.

  In order to achieve the above object, an air conditioning system according to claim 1 of the present invention is an air conditioning system that performs air conditioning inside a building by introducing outside air through a geothermal utilization tube embedded in the ground, The geothermal heat utilization tube is connected to a blowout duct disposed in an upper area inside the building, and a blowout opening of the blowout duct is opened in a lower area inside the building, and air is discharged from the blowout opening. And

  An air conditioning system according to claim 2 of the present invention is the above-mentioned geothermal heat utilization tube according to claim 1, further comprising a distribution tube disposed under the roof of the building and connected to a plurality of blowing ducts. Is characterized in that one end is connected to the outside air introduction duct and the other end is connected to the distribution tube, and the outside air introduced from the outside air introduction duct is guided to the distribution tube.

  An air conditioning system according to claim 3 of the present invention is characterized in that, in claim 2 described above, an auxiliary heat exchanger is interposed between the geothermal utilization tube and the distribution tube.

  An air conditioning system according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects described above, the outlet is provided at a height of 3 m from the floor.

  According to the present invention, since the blowout opening of the blowout duct is opened to the lower area inside the building, only the lower layer portion where many people are present inside the building having a large-scale space such as a factory building. Can be efficiently cooled. Moreover, the conditioned air is discharged from the outlet of the outlet duct disposed in the upper area inside the building, and there is no need to provide the outlet on the floor surface. For this reason, there is no possibility that the air outlet becomes an obstacle in the layout of the device or a restriction on work. In addition, in the future, it will not be necessary to consider the outlets when building machine foundations and pits under the floor. Therefore, restrictions on the use of the indoor space can be eliminated.

  Exemplary embodiments of an air conditioning system according to the present invention will be described below in detail with reference to the accompanying drawings.

(Embodiment 1)
1 to 5 show an air conditioning system 100 according to Embodiment 1 of the present invention. The air conditioning system 100 exemplified here applies to a factory building (building) having a width W of about 110 m, a depth D of about 140 m, and a height H of about 10 m, and adjusts the temperature inside the room surrounded by the outer wall 1. Is what you do. Although not explicitly shown in the figure, this factory building has no room for partitioning in the room, and the room is configured as a single large-scale space. A plurality of pillars 2 are provided at equal intervals in the factory building. In the factory building to which the first embodiment is applied, a total of 60 pillars 2 are provided so as to have an interval of about 22 m in the width W direction and an interval of about 12 m in the depth D direction.

  In the underground E, a geothermal utilization tube 10 is embedded in a region which is a lower region of the floor F of the factory building. The geothermal utilization tube 10 is formed in a cylindrical shape by a synthetic resin material having a high thermal conductivity such as polyethylene, and is arranged substantially horizontally in the ground E in a mode along the floor surface F of the factory building. In this Embodiment 1, five polyethylene geothermal heat utilization tubes 10 having a diameter of 800 mm are prepared, and as shown in FIGS. 2 and 3, these five geothermal heat utilization tubes 10 are respectively dug down 1500 mm from the ground surface E1. And it has been buried over 120m along the depth direction of the factory building. In this way, the length of the geothermal use tube 10 is set to be approximately the same as the depth D (about 140 m) of the factory building, so that a section capable of exchanging heat with the underground E is sufficiently secured.

  As shown in FIG. 1, in each geothermal utilization tube 10, an introduction duct connection portion 10 a that is curved upward is formed on one end side that extends outside the lower area of the floor F of the factory building. On the other hand, the other end side of each geothermal utilization tube 10 is connected to the lower end of a connection tube 34 that extends toward the lower side (back of the ceiling) of the roof C of the factory building. The upper ends of the individual connection tubes 34 are connected to a distribution tube 21 disposed below the roof C of the factory building.

  An external air introduction duct 11 and a plurality of blowing ducts 12 are attached to each geothermal utilization tube 10. The outside air introduction duct 11 is connected to the introduction duct connection portion 10a of the geothermal utilization tube 10 through the base end portion, extends vertically upward from the introduction duct connection portion 10a, and the distal end portion extends from the ground surface E1. It is exposed and opened outdoors. In the first embodiment, as shown in FIG. 1, an outside air introduction duct 11 whose tip is curved substantially at a right angle in the horizontal direction is applied. As a site | part which arrange | positions the external air introduction duct 11, it is preferable that it is the north side which is behind a factory building and does not receive sunlight.

  Each outside air introduction duct 11 is provided with a blower fan 13. The blower fan 13 introduces outside air into the outside air introduction duct 11 when driven. In this Embodiment 1, the ventilation fan 13 from which the flow velocity of the air which passes the inside of the geothermal utilization tube 10 will be about 2 m / s is applied.

  As shown in FIG. 5, the blow-out duct 12 includes a horizontal portion 121 extending in the horizontal direction from each side circumferential surface of the distribution tube 21 disposed in the upper direction in the factory building along the depth direction. The vertical portion 122 is connected to the tip of the horizontal portion 121 and is curved vertically downward. A blowout port 12a is formed at the lower end of each vertical portion 122 and opens into the room of the factory building. The position of the air outlet 12a is set at a height (h) of 3 m from the floor F so as not to hinder indoor work and layout of various machines. By doing so, there is no possibility that the air outlet 12a becomes an obstacle in the layout of the device or a restriction in work. In addition, in the future, it will not be necessary to consider the outlets when building machine foundations and pits under the floor. Therefore, restrictions on the use of the indoor space can be eliminated.

  The connection tube 34 according to the first embodiment uses a Φ600 mm spiral duct, and a heat insulating material is wound around the duct. The distribution tube 21 uses a Φ800 mm spiral duct, and a heat insulating material is wound around the duct. The blowout duct 12 uses a spiral duct having a diameter of 200 mm for the horizontal portion 121, and a heat insulating material is wound around the duct. In this way, the temperature loss of the conditioned air is suppressed by winding the heat insulating material around each duct in the room. For the vertical portion 122 of the blowout duct 12, a flexible duct made of vinyl chloride having a diameter of 200 mm is applied. The lower end of the flexible duct is formed in a bellows shape, and the direction of the outlet 12a can be appropriately changed in an arbitrary direction such as obliquely downward by bending. The vertical portion 122 is fixed to the lower side of the roof C via four diagonal members 30 attached to the outer periphery of the vertical center.

  In the air-conditioning system 100 configured as described above, when the blower fan 13 of the outside air introduction duct 11 is driven, outside air is introduced into the geothermal utilization tube 10 through the outside air introduction duct 11 and is sequentially sent downstream. The air is discharged from the air outlet 12a of the air outlet duct 12 into the room of the factory building.

  Here, in the spring, summer and autumn, the temperature of the underground E tends to be lower than the outside air temperature. Therefore, the relatively high temperature outside air introduced into the outside air introduction duct 11 exchanges heat with the earth and sand in the underground E while passing through the inside of the geothermal utilization tube 10, and the temperature is higher than that of outdoor air. Will decrease by about 4 ° C. As a result, if only the blower fan 13 of each outside air introduction duct 11 is driven, air having a temperature lower by about 4 ° C. than the outside air can be supplied into the room of the factory building. As a result, it is possible to cool the factory building without incurring an increase in running cost or an increase in the amount of discharged carbon dioxide compared to installing a cooling device.

  Moreover, as described above, the air outlet 12a of the air outlet duct 12 is set at a height h of 3 m from the floor F of the factory building, and the flow velocity of air passing through the geothermal utilization tube 10 is about 2 m. Since it is about / s, the released air becomes gentle. Therefore, most of the air discharged from the outlet 12a of the outlet duct 12 is supplied only to the lower layer in the room of the factory building and does not reach the upper layer. That is, in the air conditioning system 100, only the lower layer portion is cooled in a room that is a large-scale space of a factory building. In such an air conditioning system 100, the upper part of the room remains in a high temperature state, but it is the lower part of the room that has many people, and as a result, the room that becomes a large-scale space can be efficiently cooled. Become. From these points, it is possible to reduce the running cost and the amount of discharged carbon dioxide.

  In winter, the temperature of the underground E tends to be higher than the outside air temperature. Accordingly, the relatively low temperature outside air introduced into the outside air introduction duct 11 exchanges heat with the earth and sand in the ground E while passing through the inside of the geothermal utilization tube 10, and the temperature is higher than that of outdoor air. Will rise by about 4 ° C. As a result, if the blower fan 13 of each outside air introduction duct 11 is driven, air having a temperature higher by about 4 ° C. than outside air can be supplied into the room of the factory building. Therefore, by installing this air conditioning system 100 and a separately installed heater, a factory building can be created without incurring an increase in running costs or an increase in the amount of carbon dioxide emitted compared to installing only a heater. Heating becomes possible. However, in this case, the relatively high temperature air discharged from the outlet 12a reaches the upper layer portion of the room. Therefore, it is preferable to install a blower for supplying the air of the upper layer part to the lower layer part in the upper part of the room.

(Embodiment 2)
6 and 7 show an air conditioning system 200 according to Embodiment 2 of the present invention. As shown in FIG.6 and FIG.7, you may provide the auxiliary heat exchanger 35 in the part which passes under the roof C above the connection tube 34 of this Embodiment 2. FIG.

  The auxiliary heat exchanger 35 takes in relatively high temperature air staying in the upper layer portion of the room as the return air when the return port 35a is opened, and mixes the return air with the air passing through the connection tube 34. It has a function to increase the temperature. The auxiliary heat exchanger 35 includes heating means such as a hot water heater (not shown) inside, and has a function of heating the air passing through the connection tube 34. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

  In the air conditioning system 200 configured as described above, when the blower fan 13 of the outside air introduction duct 11 is driven, outside air is introduced into the geothermal utilization tube 10 through the outside air introduction duct 11, and then the connection tube 34 and the distribution tube 21 are sequentially connected. It is fed downstream and discharged from the outlet 12a of each outlet duct 12 into the room of the factory building.

  Here, in the spring, summer and autumn, the temperature of the underground E tends to be lower than the outside air temperature. Therefore, if the auxiliary heat exchanger 35 interposed in the connection tube 34 is stopped, the relatively high temperature outside air introduced into the outside air introduction duct 11 is underground while passing through the inside of the geothermal utilization tube 10. Heat exchange is performed with the earth and sand of E, and the temperature is reduced by about 4 ° C. compared to outdoor air. As a result, if only the blower fan 13 of each outside air introduction duct 11 is driven, air having a temperature lower by about 4 ° C. than the outside air can be supplied into the room of the factory building. As a result, it is possible to cool the factory building without incurring an increase in running cost or an increase in the amount of carbon dioxide discharged.

  Moreover, as described above, the air outlet 12a of the air outlet duct 12 is set at a height h of 3 m from the floor F of the factory building, and the flow velocity of air passing through the geothermal utilization tube 10 is about 2 m. Since it is about / s, the released air becomes gentle. Therefore, most of the air discharged from the outlet 12a of the outlet duct 12 is supplied only to the lower layer in the room of the factory building and does not reach the upper layer. That is, in the air conditioning system 200, only the lower layer portion is cooled in a room that is a large-scale space of a factory building. In such an air conditioning system 200, the upper part of the room remains in a high temperature state, but it is the lower part of the room that has many people, and as a result, the room that becomes a large-scale space can be efficiently cooled. Become. From these points, it is possible to reduce the running cost and the amount of discharged carbon dioxide.

  In winter, the temperature of the underground E tends to be higher than the outside air temperature. Accordingly, the relatively low temperature outside air introduced into the outside air introduction duct 11 exchanges heat with the earth and sand in the ground E while passing through the inside of the geothermal utilization tube 10, and the temperature is higher than that of outdoor air. Will rise by about 4 ° C. And in winter, it becomes possible to further raise the temperature of the air which passes the distribution tube 21 by driving the auxiliary heat exchanger 35 mentioned above, and it becomes possible to fully heat the room of a factory building. . In this case, air heated by geothermal heat or relatively hot air staying in the upper layer portion of the room is introduced into the auxiliary heat exchanger 35, so that the auxiliary heat exchanger 35 is compared with the case where the outside air is directly introduced. The heat exchange efficiency can be improved. This makes it possible to heat the factory building without incurring an increase in running costs or an increase in the amount of carbon dioxide that is emitted.

  The auxiliary heat exchanger 35 described above does not necessarily need to be driven only during indoor heating, and may be driven during cooling as long as it has a cooler. However, the return port 35a for introducing return air needs to be kept closed. Even during the cooling, since the air cooled by the geothermal heat is introduced into the auxiliary heat exchanger 35, it is possible to improve the heat exchange efficiency as compared with the case where the outside air is directly introduced.

  When the auxiliary heat exchanger 35 is provided with a blower fan that supplies air after heat exchange to the distribution tube 21, the blower fan 13 of the outside air introduction duct 11 may be omitted.

  In Embodiments 1 and 2 described above, the outlet 12a of the outlet duct 12 is arranged at a height h of 3 m from the floor surface F. However, the present invention is not limited to this, and the factory It can be opened in the lower area in the building interior, and may be arranged at any height as long as it does not interfere with indoor use. The lower area in the room where the air outlet 12a is opened is the height at which the air discharged from the air outlet 12a is supplied only to the lower layer in the room where there are many people, as described above.

  Moreover, although Embodiment 1 and 2 mentioned above have illustrated the air-conditioning system which applied factory building to all, it is possible to apply similarly to another building.

  Further, the specific numerical values described in the first and second embodiments are for illustrative purposes and do not limit the present invention. For example, although the diameter of the distribution tube 21 and the diameter of the geothermal utilization tube 10 are the same, it is not always necessary to have the same diameter, and conditions such as the amount of air supplied to the room and heat exchange efficiency according to the scale of the building May be set as appropriate.

  As described above, according to the present invention, since the outlet of the outlet duct is opened in the lower area inside the building, there are many people even inside the building having a large-scale space such as a factory building. Only the lower layer portion that is present can be efficiently cooled. Moreover, since the outlet is provided at the lower end of the vertical portion of the outlet duct disposed under the roof inside the building, it is not necessary to provide the outlet on the floor surface. For this reason, there is no possibility that the air outlet becomes an obstacle in the layout of the device or a restriction on work. In addition, in the future, it will not be necessary to consider the outlets when building machine foundations and pits under the floor. Therefore, restrictions on the use of the indoor space can be eliminated.

It is a conceptual diagram which shows the principal part of the air conditioning system which is Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the factory building to which the air conditioning system shown in FIG. 1 is applied. It is a top view of the lower side of the floor surface F of the air conditioning system shown in FIG. It is a top view of the lower side of the roof C of the air conditioning system shown in FIG. It is a cross-sectional view which shows the principal part of the air conditioning system shown in FIG. It is a conceptual diagram which shows the principal part of the air conditioning system which is Embodiment 2 of this invention. It is a cross-sectional view which shows the principal part of the air conditioning system shown in FIG.

Explanation of symbols

2 pillar 10 geothermal use tube 10a introduction duct connection portion 11 outside air introduction duct 12 blowout duct 12a blowout port 13 blower fan 21 distribution tube 34 connection tube 35 auxiliary heat exchanger 35a return port 100, 200 air conditioning system 121 horizontal portion 122 vertical portion C Roof E Underground F Floor

Claims (4)

An air conditioning system that air-conditions a building by introducing outside air through a geothermal tube embedded in the ground,
The geothermal heat utilization tube is connected to a blowout duct disposed in an upper area inside the building, and a blowout opening of the blowout duct is opened in a lower area inside the building, and air is discharged from the blowout opening. Air conditioning system. A distribution tube disposed under the roof of the building and connected to a plurality of blowout ducts;
The geothermal heat utilization tube has one end connected to the outside air introduction duct and the other end connected to the distribution tube, and guides outside air introduced from the outside air introduction duct to the distribution tube. Item 2. The air conditioning system according to Item 1.   The air conditioning system according to claim 2, wherein an auxiliary heat exchanger is interposed between the geothermal utilization tube and the distribution tube.   The air conditioning system according to any one of claims 1 to 3, wherein the outlet is provided at a height of 3 m from the floor.

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