JP6262313B1 - Air conditioning system for large spaces - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an environment that maintains a constant temperature in an air-conditioned space of a large space with a high ceiling and does not hinder work in the air-conditioned space. SOLUTION: The present invention provides an air-conditioned space Sa in which a heating element M is installed and needs to be maintained at a predetermined temperature, and is outside the air-conditioning management that is positioned above the air-conditioned space Sa and does not need to be maintained at the predetermined temperature. A large space air conditioning system 10 for cooling a large space S having a high ceiling height having a space Sb, and forcing the air for cooling upward in a plurality of locations of the space Sb outside the air conditioning management By blowing out, the indoor air including the waste heat of the heating element M that has risen from the air-conditioned space Sa is attracted and mixed with the air for cooling, and then the airflow that is naturally lowered from the air-conditioning control outside space Sb is supplied to the air-conditioned space Sa. It is comprised so that it may do. [Selection] Figure 1

Description

  The present invention relates to an air conditioning system for a large space for cooling a large space with a high ceiling where equipment with a large amount of heat is installed to a constant temperature.

  In general, factories such as metal processing factories have large spaces with high ceilings due to demands for production equipment. In this kind of large space, machine tools and other devices that generate a large amount of heat are installed, so an indoor environment with a constant temperature and a low wind speed is required. Therefore, various air conditioning systems are conventionally provided to cool such a large space.

  However, in this type of conventional air conditioning system, it takes time to remove the heat load from the air heated by the waste heat of the equipment, and the waste heat from the equipment drifts through the air-conditioned space for a long time. There is a problem that there is a risk of disturbing.

  In addition, temperature unevenness between an area where a device with a large amount of heat generation is installed and an area where the device is not installed, or a temperature caused by irregularly performing operations that cause a device with a large amount of heat to operate or stop Unevenness is likely to occur. Further, the waste heat from the device moves horizontally in the air-conditioned space, so that a high temperature region is easily formed like a river flow toward the suction port. Therefore, there is a problem that it is difficult to keep the air-conditioned space at a constant temperature due to these factors.

  Therefore, in order to solve the problems as described above, for example, by giving a swirl component to the low-temperature air blown sideways from the air supply port of the air supply chamber installed on the wall surface toward the air-conditioned space, A replacement ventilation system has been proposed in which the amount of air attracted by low-temperature air is increased and the temperature difference between the conditioned spaces is reduced (see, for example, Patent Documents 1 and 2 or Non-Patent Document 1).

  In addition, by using the momentum of jet air blown out at high speed from the nozzle of the blower unit installed on the ceiling, the apparent ventilation frequency is increased to form a constant temperature environment in the room. An air-conditioning ventilation system has also been proposed (see, for example, Patent Document 3 or Non-Patent Document 2).

JP 2002-372268 A (Patent No. 4006196) Japanese Patent Laying-Open No. 2005-282892 (Patent No. 4421347) JP 07-318124 A (Patent No. 3339527)

Takasago Thermal Engineering Co., Ltd. website (http://www.tte-net.co.jp/solution/systems/009.html) regarding the swirl flow induced stratified air conditioning system Nihon Floda Co., Ltd. website (http://www.nipponfloda.co.jp/products/dv/dv.html) about large space special air conditioning ventilation system

  However, in the conventional replacement ventilation system described above, since the air supply chamber is installed on the wall surface, depending on the arrangement of the equipment installed in the air-conditioned space, low-temperature air blown out from the air supply port of the air supply chamber may be There is a risk of not reaching the surroundings of the device sufficiently. For this reason, a temperature difference occurs in the air-conditioned space, and there is a problem that it is difficult to maintain the air-conditioned space at a constant temperature.

  In addition, there is a problem in that work in the air-conditioned space is hindered because the air velocity of the cooling air is high in the immediate vicinity of the air supply port of the air supply chamber installed on the wall surface.

  Furthermore, since the wall surface is used as an installation space for the air supply chamber, equipment cannot be placed near the wall, or in the case of a factory, the air supply chamber may interfere with the running of the forklift. There are also problems.

  Furthermore, in a factory with a space of 100 m square, for example, the air supply chambers installed on the walls on both sides must be responsible for a temperature environment of 50 m in length, so that the temperature environment in the air-conditioned space tends to be uneven. As described above, there is a problem that as the space becomes larger, delicate temperature control cannot be performed.

  On the other hand, the above-mentioned conventional Derivet (registered trademark) type air-conditioning ventilation system has a problem in that work in the air-conditioned space is hindered because the air velocity is very fast in front of the nozzle of the blower unit.

  In addition, when the amount of heat generated from the equipment in the air-conditioned space is large or the ceiling height in the air-conditioned space is high, the air for cooling must be sufficiently agitated only with the induced airflow from the nozzle of the general-purpose class blower unit. Therefore, there is a problem that it is difficult to maintain the air-conditioned space at a predetermined temperature.

  Furthermore, there is a problem that the arrangement of the nozzles is affected by the arrangement of the production equipment in the factory and a problem that the induced airflow of the nozzles is individual and fragmented, resulting in poor mixing efficiency.

  The present invention has been made to solve the various problems described above, and provides an air conditioning system for large spaces that can maintain a constant temperature in the air-conditioned space and does not interfere with the work in the air-conditioned space. The purpose is to do.

  The present invention provides a ceiling having an air-conditioned space in which a heating element is installed and needs to be maintained at a predetermined temperature, and a space outside the air-conditioning management that is positioned above the air-conditioned space and does not need to be maintained at the predetermined temperature. An air conditioning system for large space for cooling a large space with high height, and the air for cooling is forcibly blown upward at a plurality of locations outside the air-conditioning control space, thereby rising from the air conditioning space. After the indoor air containing the waste heat of the heating element is attracted and mixed with the cooling air, the airflow naturally lowered from the outside air conditioning management space is supplied to the air conditioning space. Features.

  Further, in the large space air conditioning system according to the present invention, in the space outside the air conditioning management, an air conditioner that forcibly sends the cooling air and the cooling air sent from the air conditioner are placed at predetermined positions. An air supply duct that leads and a plurality of air outlets that are disposed in the air supply duct and that blow the cooling air obliquely upward are provided.

  Moreover, the air conditioning system for large spaces according to the present invention has two rows of air outlet groups arranged in a straight line in a posture in which a plurality of the air outlets are inclined obliquely upward in the same direction in parallel at the same height. The air outlets of the air outlet group in one row and the air outlets of the air outlet group in the other row are inclined in opposite directions so as to face each other.

  In the large space air conditioning system according to the present invention, it is preferable that the inclination angle of the air outlet is set to the same angle in a range of 5 to 45 ° with respect to the vertical direction.

  In the large space air conditioning system according to the present invention, the cooling air is blown obliquely upward at a high speed of 10 to 35 m / s from the outlet, and an air velocity in the conditioned space is 0.6 m / s or less. It is preferable that it is provided so that it may become low speed.

  Moreover, the large space air conditioning system according to the present invention is characterized in that the large space is provided in a factory in which replacement or rearrangement of the devices that are the heating elements is frequently performed.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to maintain the inside of an air conditioned space at constant temperature, various effects, such as being able to improve the working environment in an air conditioned space, can be acquired.

It is a conceptual diagram which shows the air conditioning system for large spaces which concerns on embodiment of this invention. It is a top view which shows the result of having performed the thermofluid analysis about the temperature distribution when the air-conditioning space is cooled by the air conditioning system for large spaces which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is a top view which shows the result of having performed the thermofluid analysis about the airflow distribution when the air-conditioning space is cooled by the air conditioning system for large spaces which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is explanatory drawing which shows the large space which can apply the air conditioning system for large spaces which concerns on embodiment of this invention.

  Hereinafter, an air conditioning system for large spaces according to an embodiment of the present invention will be described with reference to the drawings. In the following description, a case where the large space air conditioning system 10 according to the present invention is installed in a large space S of a metal processing factory where a plurality of machine tools M as heating elements are installed will be described as an example.

  The large space S in which the large-space air conditioning system 10 is installed has a high ceiling height and is required to be maintained at a predetermined temperature and an air conditioning space Sa that needs to be maintained at a predetermined temperature and a ceiling level above the air conditioning space Sa. And an air conditioning management outside space Sb that does not need to be maintained.

As an example in the embodiment of the present invention, the large space S has a floor area of 2000 m ² (40 m × 50 m square) and a ceiling height (straight sky) of 17 m, and is a space up to 6 m above the floor. Is set in the conditioned space Sa. This air-conditioned space Sa is divided into 10 zones in a plan view, and each zone has a floor area of 200 m ² .

  In the air-conditioned space Sa, a machine tool M whose heating value varies is fixed and arranged on a mat slab (pressure plate or solid foundation). Further, the production crane C is provided in the air conditioning management outside space Sb so as to be linearly movable between the opposing walls.

  In the air-conditioned space Sa, it is required to maintain an environment with a temperature of 23 ° C. ± 1 ° C. and an air velocity of 0.6 m / s or less throughout the year. In order to realize this environment, the large space air conditioning system 10 according to the embodiment of the present invention forcibly sends out air for cooling and the air for cooling sent from the air conditioner 11 at a predetermined position. And a plurality of outlets 13 that are arranged in the air supply duct 12 and blown out the cooling air obliquely upward.

  The air conditioner 11, the air supply duct 12, and the air outlet 13 are respectively disposed in the air conditioning management outside space Sb. For example, one air conditioner 11 is installed in each zone, and a total of eight air conditioners 11 are installed. In addition, as will be described later, for example, two air conditioners (outside air conditioners) for treating the outside air are installed. Each air conditioner 11 has a cooling coil (not shown) that cools the air to generate cooling air, and the air supply speed of the cooling air is variable between 10 and 35 m / s depending on the thermal load in the room. And a blower with an inverter (not shown) whose rotational speed is controlled as described above. The air conditioner 11 is cascade controlled so that the supply temperature of the cooling air becomes a predetermined temperature (for example, 16 ° C.).

  The air supply duct 12 is disposed between a pair of two straight ducts 14 arranged in parallel and horizontally at the same height (for example, a height of 9 m above the floor), and between the straight ducts 14 and the air conditioners 11. Connecting duct 15 to be provided.

  Each of the plurality of air outlets 13 includes a flexible duct erected on the straight duct 14 at a predetermined interval and a 100% open nozzle fixed to the upper end of the flexible duct. The plurality of air outlets 13 on the straight ducts 14 in the same row are inclined in the same direction and obliquely upward at the same angle to form an air outlet group. And the blower outlet 13 of the blower outlet group of one row | line | column and the blower outlet 13 of the blower blower group of the other row | line | column which opposes this one row | line | column are each a proximity | contact direction center, as shown by the solid line arrow in FIG. They are inclined in opposite directions so as to blow air upward obliquely.

  The inclination angle of the air outlet 13 is preferably set in the range of 5 to 45 ° with respect to the vertical direction according to the distance between the air outlet groups facing each other and the distance from the air outlet 13 to the ceiling. . As described above, since the air outlet 13 is formed of a flexible duct, the inclination angle of the air outlet 13 can be easily adjusted. Moreover, an internal opening area can be changed arbitrarily by pressing the outer surface of a flexible duct, and the air volume from each blower outlet 13 can be adjusted easily.

  The large space air conditioning system 10 includes a lower suction port 17 provided at a lower portion of the wall surface 16 so as to face the air conditioning space Sa, a suction chamber 18 formed in a vertical direction along the wall surface 16, and a suction chamber 18. A return air duct 19 for connecting the air conditioner 11 and an upper suction port 20 provided in the upper part of the air conditioning management outside space Sb are provided. The upper suction port 20 is attached to the air conditioner 11 via the return air duct 21 or directly attached to the main body of the air conditioner 11.

  As shown on the left and right sides of FIG. 1, when both the lower suction port 17 and the upper suction port 20 are provided for one air conditioner 11, the return air duct 19, The electric dampers 22 and 23 may be respectively installed in 21 and the electric dampers 22 and 23 may be switched and controlled, for example, using the lower inlet 17 in the winter and the upper inlet 20 in the summer.

  Further, although not particularly illustrated, the large space air conditioning system 10 is a predetermined number (for example, two) of outside air processing air conditioners (hereinafter referred to as “external air conditioners”) installed in the air conditioning management outside space Sb. And a plurality of air supply ports for blowing air taken in from the outside by the external air conditioner obliquely upward in the air conditioning management outside space Sb.

  Next, the operation of the large space air conditioning system 10 having the above-described configuration will be described.

  In the air conditioners 11 of each zone, the cooling air cooled and sent to a predetermined temperature (for example, 16 ° C.) passes through the connection duct 15 and the pair of two straight ducts 14 and is indicated by solid arrows in FIG. In this way, each of the air outlets 13 facing each other is blown out into the air-conditioning management outside space Sb obliquely upward in the center.

  Thus, the air for cooling blown out to the air-conditioning management outside space Sb rises while attracting and mixing the room air including the waste heat of the machine tool M naturally rising from the air-conditioning space Sa. At this time, the air for cooling is blown obliquely upward in the same direction from the group of outlets in the same row to form a planar air flow, and the direction of the air flow is the same as the rising air flow including the waste heat of the machine tool M. Therefore, the updraft is likely to occur, the mixing efficiency of the cooling air and the updraft can be increased, and the apparent number of circulations can be greatly reduced as compared with the conventional case.

  Thus, the air that has been mixed with the room air containing the waste heat of the machine tool M and has a uniform temperature naturally descends from the air-conditioning management outside space Sb to the air-conditioning space Sa due to the increased specific gravity. Supplied to Sa. After that, the air is returned to the air conditioner 11 through the lower suction port 17 or the upper suction port 20, cooled by the cooling coil, and then blown out into the air conditioning management outside space Sb by the blower, thereby forming a circulating airflow. Is done.

  Moreover, a part of the air for cooling which attracted and mixed the indoor air which naturally rose from the air-conditioned space Sa is discharged to the outside through an air exhaust (not shown). On the other hand, air having the same air volume as the discharged air is taken in from the outside through the external air conditioner, and is supplied obliquely upward from the air supply port into the air conditioning management outside space Sb. Mixed with elevated air.

  2-6 has shown the result of having performed the thermal fluid analysis (Computational Fluid Dynamics: CFD) about the temperature distribution when the air-conditioning space Sa of the large space S is cooled by the above-mentioned large-scale air conditioning system 10. . 2 is a plan view showing the temperature distribution of the air-conditioned space Sa 1.5 mm above the floor, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, FIG. 4 is a cross-sectional view taken along the line BB in FIG. FIG. 6 is a cross-sectional view taken along the line CC of FIG. 6, and FIG. 6 is a cross-sectional view taken along the line DD of FIG. According to these analysis results, it is said that almost all (approximately 90%) of the air-conditioned space Sa (space up to 6 m above the floor) falls within the required temperature range (23 ° C. ± 1 ° C.). Good results could be obtained.

  7 to 11 show the results of performing thermal fluid analysis (Computational Fluid Dynamics: CFD) on the airflow distribution when the air conditioning space Sa of the large space S is cooled by the large space air conditioning system 10 described above. ing. 7 is a plan view showing the airflow distribution in the air-conditioned space Sa 1.5 mm above the floor, FIG. 8 is a cross-sectional view taken along the line AA in FIG. 7, FIG. 9 is a cross-sectional view taken along the line BB in FIG. FIG. 11 is a sectional view taken along the line DD of FIG. According to these analysis results, it is said that the entire space (100%) of the air-conditioned space Sa (space up to 6 m above the floor) falls within the required airflow velocity range (0.6 m / s or less). Good results could be obtained.

  As described above, according to the large space air conditioning system 10 according to the embodiment of the present invention, the greater the amount of waste heat from the machine tool M, the faster the indoor air including waste heat rises. The influence of the waste heat of the machine M on the temperature of the air-conditioned space Sa is small. Further, in the area where much heat is generated, a large amount of ascending airflow is generated, so that a large amount of the ambient air held at the predetermined temperature (23 ° C. ± 1 ° C.) of the air-conditioned space Sa is attracted. The amount of attraction is small, and there is little air movement. Even in an area where the amount of heat generation is large, when the machine tool M is stopped, the ascending air current is also stopped. Furthermore, since the waste heat from the machine tool M rises with the induced airflow, horizontal movement is reduced, turbulence is not generated, and heat load is not diffused.

  As described above, the temperature of the area with a large amount of heat generation in the air-conditioned space Sa and the temperature of the area with a small amount of heat generation are balanced, and the difference in the air-conditioning environment between the two areas is small. In addition, since the ascending air flow including the waste heat of the processing machine M and the cooling air blown out from the air outlet 13 at high speed can be effectively mixed in the upper part of the air-conditioned space Sa, the amount of air supplied in the air-conditioned space Sa can be reduced. It is possible to reduce the energy consumption. Further, since the cooling air and the rising indoor airflow are mixed above the air-conditioned space Sa, the temperature distribution of the air-conditioned space Sa can be maintained well without strictly controlling the supply air temperature of the air conditioner 11. Therefore, it is not necessary to use an electric heater with strict cooling water temperature control and good response. Therefore, cost reduction, energy saving, and high quality can be realized at the same time.

  In addition, a high-speed duct system is adopted, and a large induced airflow can be generated by arranging a plurality of outlets 13 in a straight line, so that the duct is extended even if the distance between the columns of the large space S is long. Therefore, it is possible to reduce the construction cost and the installation space of the air conditioning equipment.

  In addition, the cooling air supplied to the air-conditioned space Sa is a descending airflow from the air-conditioning control outside space Sb, and reliably reaches the periphery of the large machine tool M and the production equipment, so that the blind spot of the airflow disappears. The performance of the machine M can be maintained high. In addition, since the air outlet 13 is installed in the high air conditioning management outside space Sb and the air for cooling is blown obliquely upward, even in the case where the wind speed in the immediate vicinity of the air outlet 13 is fast, the air outlet space Sa is in a low-rise area. The air velocity can be kept low, there is no possibility that the work in the air-conditioned space Sa will be hindered, and the work environment can be improved.

  Furthermore, since the air conditioning equipment such as the air conditioner 11, the air supply duct 12, and the air outlet 13 can be arranged in the space outside the air conditioning management Sb regardless of the arrangement of the production device such as the machine tool M, the machine tool M Even if the thermal load in the air-conditioned space Sa fluctuates due to rearrangement, etc., there is no need to perform extensive repair work of ducts and piping, simply increasing or decreasing the number of outlets 13 or one blower It is possible to respond relatively easily by changing the area in which the exit 13 is in charge. Moreover, since the air-conditioning equipment is not installed on the wall surface of the air-conditioned space Sa, the arrangement of the machine tool M can be freely determined or changed, and flexibility can be enhanced. Furthermore, if the ceiling height of the large space S has a certain height, there is no element that adversely affects the environment (temperature, wind speed) of the air-conditioned space Sa due to the difference in the ceiling height. Applicable applications can be expanded.

In the description of the embodiment of the present invention described above, a large space S having a floor area of 2000 m ² and a ceiling height of 17 m and a height of 6 m above the floor is set as the air-conditioned space Sa. Although illustrated about the case where the air conditioning system 10 for large spaces was installed, this invention is applicable if it is the large space S with a high ceiling height which has a floor area of about 100 m < ² > or more and a ceiling height of about 6 m or more. It is. Further, the air outlet 13 is not necessarily provided in a posture inclined obliquely upward as long as the air for cooling is provided so as to be forced upward.

  As described above, the reason why the ceiling height of the large space S to which the large space air conditioning system 10 can be applied is set to about 6 m is that the ceiling height H of the air conditioning space Sa installs the equipment as shown in FIG. This is because a minimum height of 3 m is required and the ceiling height H of the outside air conditioning management space Sb is 3 m in order to install the air conditioning equipment.

Moreover, the grounds for setting the floor area of the large space S to which the large space air conditioning system 10 can be applied to about 100 m ² are as shown in FIG. Since each of them expands by 30 °, the space width D1 for the updraft needs 1.2H, and the space width D2 for the downflow toward the air-conditioned space Sa is the same as the space width D1 for the updraft, respectively. Since 1.2H is required, the total width is required to be at least 4.8H (4.8 × 3 = 14.4 m≈15 m). And, since one span of the depth width of the building having the large space S is generally 6 to 8 m in terms of structure, the large space can be obtained by multiplying the overall width (15 m) and the depth width (6 m to 8 m). floor area S is because the ^{90m 2 ~120m} 2.

  The technology of the present invention is not limited to the above-described various factories such as metal processing factories, and the amount of heat generated from the equipment is considerably larger than the amount of cold heat per unit area, and the equipment etc. to maintain the indoor environment within a predetermined range. It is expected to be used in buildings for other purposes, such as data centers with large spaces with high ceiling height that require the removal of waste heat from the heating elements.

DESCRIPTION OF SYMBOLS 10 Air conditioning system for large spaces 11 Air conditioner 12 Air supply duct 13 Air outlet M Machine tool (heating element)
S Large space Sa Air-conditioned space Sb Space outside air-conditioning management

Claims (4)

High ceiling height having an air-conditioned space that needs to be maintained at a predetermined temperature by installing a heating element, and an air-conditioning-controlled space that is located above the air-conditioned space and does not need to be maintained at the predetermined temperature A large space air conditioning system for cooling a large space,
By forcibly blowing the cooling air upward at a plurality of locations outside the air-conditioning management space, the room air including the waste heat of the heating element rising from the air-conditioning space is attracted and mixed with the cooling air. After that, it is configured to supply the air-conditioned space with the airflow naturally lowered from the air-conditioning management outside space ,
An air conditioner that forcibly sends out the air for cooling, an air supply duct that guides the air for cooling sent from the air conditioner to a predetermined position, and an air duct that is disposed outside the air conditioning management space And a plurality of outlets for blowing out the cooling air obliquely upward, and
Two rows of a pair of outlets arranged in a straight line in a posture in which a plurality of the outlets are inclined obliquely upward in the same direction are arranged in parallel at the same height, and the outlet groups of one row An air conditioning system for a large space , wherein the air outlets and the air outlets of the air outlet group in the other row are inclined in opposite directions so as to face each other . 2. The air conditioning system for large spaces according to claim 1 , wherein the inclination angle of the air outlet is set to the same angle in a range of 5 to 45 ° with respect to the vertical direction. The air for cooling is blown obliquely upward at a high speed of 10 to 35 m / s from the air outlet, and is provided so that an air velocity in the air-conditioned space is a low speed of 0.6 m / s or less. The air conditioning system for large spaces according to claim 1 or 2 . The large space air conditioning system according to any one of claims 1 to 3 , wherein the large space is provided in a factory in which replacement and rearrangement of devices that are the heating elements are frequently performed.

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