JP6961374B2 - Air conditioning method and air conditioning system - Google Patents

Description

The present invention relates to a method and a system for air-conditioning a room such as a food factory where workability, hygiene, energy saving and economy are required.

As a device for ventilating an indoor space, a displacement ventilation system (Displacement Ventilation System) is known. In this replacement ventilation system, air slightly lower than room temperature is supplied to the lower part of the room (for example, work area or living area) at a slow air supply rate, and the air is heated indoors to generate an upward flow that causes the room to flow. It transports pollutants such as dust and gas generated in the room to the upper part of the room. Then, the room is ventilated by exhausting pollutants together with heated air from a suction port provided on the ceiling or the like.

In such a replacement ventilation system, a region having a high pollutant concentration at a high temperature is formed above the room, but the pollutant concentration at a high temperature is increased by being sequentially pushed out by the low temperature air supplied to the room. Since high air is exhausted without being agitated, the work area and living area below the room are kept in a clean environment, and the room temperature can be maintained within a comfortable range without lowering the supply air temperature. There is. As described above, the replacement ventilation system is expected as an air conditioning system capable of energy saving and high ventilation efficiency operation.

Further, the applicant discloses, for example, Patent Documents 1 and 2 a stratified air conditioning system that supplies low-temperature air to the lower part of a room as a swirling airflow. According to this technology, by attracting the ambient air with a swirling blowout airflow, the airflow speed can be reduced and air can be supplied to the work area or living area below the room at a blowout temperature close to the set temperature with a small amount of airflow. It is possible to maintain a comfortable environment while saving energy and cost. In addition, by lifting the suspended fine particles in the work area and living area to the upper part of the room and discharging them, the work area and living area can be kept clean with less air volume than before, and the annual energy consumption can be reduced. It will be possible.

JP-A-2002-372268 Japanese Unexamined Patent Publication No. 2005-282892

By the way, in a room such as a food factory that handles foods and beverages, it is maintained in a predetermined low temperature environment in order to prevent the growth of bacteria during processing and filling work, and it is processed from the viewpoint of hygiene. After the work such as filling and filling is completed, a step of cleaning the room with detergent, boiling water, water or the like is performed. In this cleaning process, moisture is trapped inside the room, and the floor, walls, and ceiling are wet. If left as it is, it may cause condensation and mold, which may cause hygienic problems. ..

The present invention has been made in view of the above circumstances, and is an air conditioner capable of keeping the room of a food factory or the like in an energy-saving, comfortable and normal low temperature environment, and quickly drying the room after cleaning. The purpose is to provide methods and air conditioning systems.

In order to solve the above problems, according to the present invention, air conditioned by an air conditioner is supplied into the room from an air outlet provided at the lower part of the room where the work is performed, and is provided at the upper part of the room. This is a method of air-conditioning the room by exhausting the indoor air from the suction port, wherein the air conditioner heat-treats and cools the outside air and supplies the air to the room from the air outlet. Including a return air-treated air conditioner that heat-treats and cools the return air exhausted from the room and supplies the air to the room from the outlet, and blows out the air that has been cooled by the air-conditioner in the vicinity of the ceiling. When work is performed in the room without an air outlet, a replacement air return method is used in which the air supply cooled by the air conditioner is blown out from the air outlet into the room and the room air is exhausted from the suction port. The work space below the room is set to 15 ° C or less, and the wind speed in the work space is set to 0.20 m / s or less so that the worker does not feel a draft. and to prevent dew condensation in the ceiling near by conditioning the room below 80% relative humidity of the ceiling vicinity when drying the room, the indoor air supply heated treated by the air conditioner from the air outlet When the work is performed in the room, the return air treatment air conditioner sucks in the room air heated by the heat load in the room and cools it. An air conditioning method is provided, which is a medium-temperature package that supplies heat-treated air when air is supplied and the room is dried, and is characterized in that a separate device for supplying warm air is not provided for drying. NS.

In this air conditioning method, after the work is performed in the room, the room may be washed, the room may be washed, and then the room may be dried. In this case, when cleaning the room, the outside air that has not been cooled and heat-treated may be used as supply air to be blown into the room from the air outlet, and the room air may be exhausted from the suction port. Further, the exhaust amount when the chamber is dried may be larger than the exhaust amount when the work is performed in the chamber. Further, the outlet may be one that gives a swirling component to the supply air and blows it into the room.

Further, according to the present invention, an air conditioning system for air-conditioning a room in which work is performed, the air outlet provided at the lower part of the room, an air conditioner for supplying air to the room from the air outlet, and the above. The air conditioner is provided with a suction port provided at the upper part of the room and an exhaust fan for exhausting room air from the suction port. The air conditioner heats the air with a heat exchanger capable of heat treatment and cooling treatment and the heat exchanger. The air conditioner includes an air blower fan that blows the treated or cooled air, and the air conditioner includes an outside air treatment air conditioner that heats and cools the outside air and supplies the air to the room from the air outlet, and a return air that is exhausted from the room. It includes a return air treatment air conditioner that heats and cools the air and supplies air to the room from the air outlet, and there is no air outlet near the ceiling that blows out the air that has been cooled by the air outlet. When the work is performed in the room, the air supply cooled by the air conditioner is blown out into the room from the outlet, the room air is exhausted from the suction port, and the work below the room is performed by the replacement air return method. The space is set to 15 ° C or less and the wind speed in the work space is set to 0.20 m / s or less so that the operator does not feel a draft . By air-conditioning the room with a relative humidity of 80% or less, the occurrence of dew condensation near the ceiling is prevented, and when the room is dried, the air supply heat-treated by the air conditioner is blown into the room from the air outlet, and the room is described. The indoor air is exhausted from the suction port, and when the work is performed in the room, the return air processing air conditioner sucks in the indoor air heated by the heat load in the room and cools it to supply air. An air conditioning system is provided, which is a medium-temperature package that supplies heat-treated air when the room is dried, and is characterized by not providing a separate device for supplying warm air for drying.

According to the present invention, when work is performed indoors, the air supplied cooled by the air conditioner is blown out into the room from the air outlet, and the indoor air is exhausted from the suction port, thereby saving energy in the room of a food factory or the like. You can keep it in a comfortable and normal environment. Further, when the room is dried after cleaning, the room can be quickly dried by exhausting the room air from the suction port while blowing out the air supply heat-treated by the air conditioner into the room from the air outlet.

It is a schematic block diagram for demonstrating the air-conditioning system which concerns on embodiment of this invention. It is a front view of the air supply chamber. It is a front view of the air outlet with fins attached so as to give a turning component in the counterclockwise rotation direction to air supply when viewed from the indoor side of the air-conditioned space. It is a front view of the air outlet with fins attached so as to give the turning component in the clockwise direction to the air supply when viewed from the indoor side of the air-conditioned space. It is explanatory drawing of the outlet which made the turning component of the air supply blown out from the adjacent outlet alternately in the opposite rotation direction. It is explanatory drawing of the outlet which made the turning component of the air supply blown out from the adjacent outlet in the same rotation direction. In both the vertically arranged outlets and the horizontally arranged outlets, the swirling components of the air supply blown out from the adjacent outlets are set so as to have a relationship of rotation directions opposite to each other. It is an explanatory diagram of the air outlet. The swirling components of the air supply blown out from the adjacent outlets have a relationship of opposite rotation directions between the vertically arranged outlets, but they are adjacent to each other between the horizontally arranged outlets. It is explanatory drawing of the air outlet set so that the swirling component of the air supply blown out from the air outlet has the same rotation direction relationship with each other. It is a side view which shows the embodiment which provided the cover surface above the air supply chamber. It is a front view which shows the embodiment which provided the cover surface above the air supply chamber. It is a front view which shows the embodiment which made the bottom surface of the air supply chamber a drain pan structure. It is a graph which shows the wind speed distribution at the position of 1 m above the floor of a room at the time of work in the Example of the air-conditioning system of this invention. It is a graph which shows the temperature distribution in the vertical direction of a room at the time of work in the Example of the air-conditioning system of this invention. It is a graph which shows the relative humidity distribution in the vertical direction of a room at the time of work in the Example of the air-conditioning system of this invention. It is a graph comparing the power during work, washing, and drying when the air conditioning operation is performed by the mixing method using a low temperature package and the case where the air conditioning operation is performed by the air conditioning system of the present invention in the summer.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram for explaining the configuration of the air conditioning system 1 according to the embodiment of the present invention. In the present specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

As shown in FIG. 1, the inside of a room 10 of a food factory or the like that handles food, beverages, and the like is partitioned by a ceiling, a floor, and a side wall. A workbench 11 for processing, filling, and the like for processing and filling foods and beverages is placed inside the chamber 10, and a worker 12 is present around the workbench 11.

Air supply chambers 15 are installed at a plurality of locations in the lower portion of the chamber 10, and indoor air suction ports 16 are provided at a plurality of locations on the ceiling surface of the chamber 10. As shown in FIG. 3, a plurality of outlets 17 for blowing out the air supply SA toward the inside of the chamber 10 are arranged vertically and horizontally on the front surface of the air supply chamber 15.

Of the plurality of air supply chambers 15, some of the air supply chambers 15 are supplied with air supply SA that has been heat-treated or cooled by the outside air treatment air conditioner 20, and some of the other air supply chambers 15 are supplied with air supply SA. Is supplied with air supply SA that has been heat-treated or cooled by the return air treatment air conditioner 21. In the illustrated form, the outside air processing air conditioner 20 and the return air processing air conditioner 21 are installed in the space 22 above the room 10.

An outside air intake duct 26 is connected to the upstream portion (the right end portion of the outside air processing air conditioner 20 in FIG. 1) 25 of the outside air processing air conditioner 20. A roll filter 27 is mounted in the middle of the outside air intake duct 26. An air supply duct 31 for supplying air to the air supply chamber 15 is connected to the downstream portion (the left end portion of the outside air processing air conditioner 20 in FIG. 1) 30 of the outside air processing air conditioner 20. Inside the outside air treatment air conditioner 20, a heat exchanger 35 for heat-treating and cooling the outside air OA and an air supply fan 36 are provided between the upstream portion 25 and the downstream portion 30. A heat medium is supplied to the heat exchanger 35 via the pipe 37.

A return air duct 41 is connected to the upstream portion (the left end portion of the return air treatment air conditioner 21 in FIG. 1) 40 of the return air treatment air conditioner 21. An air supply duct 31 for supplying air to the air supply chamber 15 is connected to a downstream portion (the right end portion of the return air treatment air conditioner 21 in FIG. 1) 42 of the return air treatment air conditioner 21. Inside the return air treatment air conditioner 21, a heat exchanger 45 for heat-treating and cooling the return air RA and an air supply fan 46 are provided between the upstream portion 40 and the downstream portion 42. A heat medium is supplied to the heat exchanger 45 via the pipe 37.

As shown in FIGS. 3 and 4, each of the outlets 17 formed on the front surface of the air supply chamber 15 is equipped with a plurality of fins 50, respectively. A support member 51 is provided in the center of each outlet 17, and each fin 50 is radially attached around the support member 51 at appropriate equal intervals. Further, in order to give a swirling component to the air supply SA blown from the air outlet 17 toward the inside of the chamber 10, each fin 50 is arranged so as to be inclined with respect to the central axis 17'of the air outlet 17. In FIGS. 3 and 4, the inclination directions of the fins 50 are opposite to each other.

By radially attaching the inclined fins 50 to each outlet 17 in this way, when the air supply SA flowing from the inside of the air supply chamber 15 toward the outlet 17 passes through the outlet 17. , Can be forcibly flowed along each fin 50. As a result, the air supply SA blown out from the air outlet 17 toward the inside of the chamber 10 is provided with a swirling component centered on the central axis 17'.

Here, in FIGS. 3 and 4, the inclination directions of the fins 50 are opposite to each other, and depending on the fins 50 shown in FIG. 3, when passing through the air outlet 17, the front surface of the air supply chamber 15 is set in the chamber 10. When viewed from the inside, a turning component in the counterclockwise rotation direction is given to the supply air SA. On the other hand, depending on the fin 50 shown in FIG. 4, when the front surface of the air supply chamber 15 is viewed from the inside of the chamber 10 when passing through the air outlet 17, a turning component in the clockwise rotation direction is given to the air supply SA. Be done.

As described above, a plurality of air outlets 17 are arranged vertically and horizontally on the front surface of the air supply chamber 15, but the swirling components of the air supply SA blown out from the adjacent air outlets 17 have opposite rotation directions. It has become a relationship. That is, for example, as shown in FIG. 5, four outlets 17a, 17b, 17c, and 17d arranged in the vertical direction will be described as an example. The inclination direction of the fins 50 is the state described with reference to FIG. 3, and the air supply SA provided with the turning component in the counterclockwise rotation direction is blown out from the outlets 17a and 17c. On the other hand, at the second outlet 17b and the fourth outlet 17d from the top, the inclination direction of the fin 50 is in the state described with reference to FIG. The air supply SA given the component is blown out. In this way, between the adjacent air outlets 17a and 17b, the air outlet 17b and the air outlet 17c, and the air outlet 17c and the air outlet 17d, the air supply SA that swirls in opposite rotational directions is blown out. ing.

That is, as shown in FIG. 6, the air supply SA that turns in the same rotation direction from the four outlets 17a, 17b, 17c, and 17d arranged in the vertical direction (in the example shown in FIG. 6, all counterclockwise rotation). When the air supply SA) that turns in the direction is blown out, the air is supplied in a direction that cancels each other between the air outlet 17a and the air outlet 17b, between the air outlet 17b and the air outlet 17c, and between the air outlet 17c and the air outlet 17d. Ki SA will be blown out. Then, the swirling components of the supply air SA blown out from the outlets 17a, 17b, 17c, and 17d are offset.

On the other hand, as described with reference to FIG. 5, if the swirling components of the supply air SA blown out from the outlets 17a, 17b, 17c, and 17d are alternately in opposite rotation directions, the air is blown between the outlets 17a and 17b. Since the air supply SA is blown out in the same direction between the outlet 17b and the outlet 17c and between the outlet 17c and the outlet 17d, the air supply SA is blown out from the outlets 17a, 17b, 17c, and 17d. The turning components of the supplied air SA that are blown out are not canceled out, and the turning movements are promoted to each other.

Although the relationship between the vertically arranged outlets 17 has been described with reference to FIG. 5, a plurality of outlets 17 are arranged vertically and horizontally on the front surface of the air supply chamber 15 as described above with reference to FIG. ing. Therefore, not only in the relationship between the vertically arranged outlets 17, but also between the horizontally arranged outlets 17, the swirling components of the air supply SA blown out from the adjacent outlets rotate in opposite directions. The inclination directions of the fins 50 provided at each outlet 17 are set so as to have a directional relationship.

As shown in FIG. 1, among the suction ports 16 provided at a plurality of locations on the ceiling surface of the chamber 10, an exhaust duct 56 provided with an exhaust fan 55 is connected to some of the suction ports 16. Further, a return air duct 41 is connected to some of the other suction ports 16 and communicates with the upstream portion 40 of the return air processing air conditioner 21. As a result, the indoor air collected in the upper part of the chamber 10 (the air heated by the heat load of the worker 12 or the like in the chamber 10) is exhausted through the suction port 16, and a part of the indoor air is exhausted through the exhaust duct 56. It is discharged to the outside as EA, and the remaining part is introduced as return air RA into the upstream portion 40 of the return air treatment air conditioner 21.

Further, inside the chamber 10, a ceiling fan 57 for forcibly flowing the air in the chamber 10 toward the ceiling is installed.

In the replacement ventilation system 1 configured as described above, when work such as processing or filling of food or beverage is performed in the room 10, the heat exchanger 35 of the outside air treatment air conditioner 20 and the return air treatment air conditioning A heat medium for cooling is supplied to the heat exchanger 45 of the machine 21. Then, the outside air OA filtered by the roll filter 27 is introduced into the outside air processing air conditioner 20 via the outside air intake duct 26 and cooled. In this way, the air supply SA produced by being cooled by the outside air processing air conditioner 20 is supplied to the air supply chamber 15 by the air supply fan 36 via the air supply duct 31. Further, the return air RA discharged from the chamber 10 is introduced into the return air treatment air conditioner 21 via the return air duct 41 and is cooled. In this way, the air supply SA produced by being cooled by the return air processing air conditioner 21 is supplied to the air supply chamber 15 by the air supply fan 46 via the air supply duct 31.

In this way, the air supply SA cooled by the outside air processing air conditioner 20 and the return air processing air conditioner 21 is supplied into the chamber 10 via the plurality of air supply chambers 15. Then, when passing through the air outlet 17 on the front surface of the air supply chamber 15, the fins 50 attached to the air outlet 17 give a swirling component to the air supply SA, and each air outlet is directed toward the inside of the chamber 10. The air supply SA is blown out while turning from 17.

Then, the air supply SA blown out from each outlet 17 is attracted to the air in the chamber 10 and moves together. In this case, in the illustrated air conditioning system 1, since the swirling component is given to the air supply SA blown out from the air outlet 17, the amount of air attracted to the air supply SA (attracting ratio) in the chamber 10 increases. do. Along with this, the speed of the air supply SA will be rapidly decelerated after being blown out from each outlet 17 according to the momentum preservation law. In this case, the average wind speed of the air supply SA at the entire outlet is set to 1 m / s or less, for example, 0.7 m / s.

The air supply SA supplied into the chamber 10 in this way flows downward in the chamber 10 due to the temperature difference, fills the lower working space in the chamber 10 at a low speed, and makes the working space a low temperature environment. It will be possible to keep it in. As a result, the work space in which the processing and filling of foods and beverages are performed is maintained in a suitable low temperature environment (for example, 15 ° C. or lower, 10 ° C. or lower, etc.). Further, since the swirling component is given to the air supply SA supplied into the chamber 10 and the speed is rapidly decelerated, the workability is improved by making the worker 12 in the work space less likely to feel the draft and reducing the discomfort. Can be improved. For example, as described above, in a meat processing factory or the like, it is required to maintain the working area in a low temperature environment such as 15 ° C. or lower or 10 ° C. or lower. Especially in such a low temperature environment, when a draft occurs, the worker 12 feels cold and the workability is remarkably lowered, but this can be reduced by the air conditioning system of the present invention.

On the other hand, since a worker 12 or the like as a heating element exists in the room 10, the air supply SA supplied into the room 10 and thermally contacting the worker 12 or other heat generating equipment is present. Eventually, it is heated and rises slowly. Due to the ascending flow, pollutants such as dust and gas generated around the workbench 11 and the worker 12 in the chamber 10 can be conveyed upward in the chamber 10.

Then, the indoor air (heated air) accumulated in the upper part of the chamber 10 is not agitated, that is, without disturbing the temperature stratification such as the work space below the chamber 10, the suction port 16 and the exhaust duct. After passing through 56, the exhaust is EA to the outside by the exhaust fan 56. Further, a part of the air exhausted from the chamber 10 is introduced into the return air treatment air conditioner 21 as the return air RA, cooled, and then becomes the supply air SA, and the air supply chamber 15 to the room 10 again. Supplied within.

In this way, during work, while supplying low-temperature air supply SA to the lower part of the room 10, air conditioning in the room 10 is performed by exhausting pollutants such as dust and gas together with heated air from the upper part of the room 10. The lower part of the chamber 10 is maintained in a clean low temperature environment of air supply SA.

Next, after the work is performed in the chamber 10 in this way, a step of cleaning the inside of the chamber 10 is performed. In this cleaning step, the room is cleaned with detergent, boiling water, water, or the like. Since steam and mist are generated in the room 10 during cleaning, the air supply fan 36 of the outside air processing air conditioner 20 is operated, and the outside air OA is introduced into the room 10 from the air supply chamber 15 to enter the room 10. It is preferable that the air is quickly exhausted to the outside by the exhaust fan 56 through the suction port 16 and the exhaust duct 56. In this case, unlike the work such as meat processing, it is not necessary to keep the room in a low temperature environment, so that the heat medium to the heat exchanger 35 of the outside air treatment air conditioner 20 and the heat exchanger 45 of the return air treatment air conditioner 21 Supply can be stopped, which can save energy.

On the other hand, in the cleaning process, the room becomes damp and the floor, walls, and ceiling become wet. If left as it is, it may cause dew condensation and mold, which may cause hygienic problems. .. Therefore, after the cleaning step is completed, a step of drying the inside of the chamber 10 is carried out.

When the inside of the chamber 10 is dried in this way, a heat medium for heating is supplied to the heat exchanger 35 of the outside air processing air conditioner 20. Then, the outside air OA filtered by the roll filter 27 is introduced into the outside air treatment air conditioner 20 via the outside air intake duct 26 and heat-treated. In this way, the air supply SA produced by being heat-treated by the outside air processing air conditioner 20 is supplied to the air supply chamber 15 by the air supply fan 36 via the air supply duct 31. On the other hand, the air in the chamber 10 is quickly exhausted to the outside by the exhaust fan 56 through the suction port 16 and the exhaust duct 56. As a result, the heat-treated air supply SA can be supplied into the chamber 10 to be quickly dried, and the occurrence of dew condensation and mold can be prevented.

When the inside of the room 10 is dried, the power of the air supply fan 36 of the outside air processing air conditioner 20 is increased, and the amount of air supplied to the room is compared with the amount of air supplied by the outside air processing air conditioner 20 when the work is performed in the room 10. It is preferable to set so that the amount of air supplied by the outside air processing air conditioner 20 when the 10 is dried is large. In this case, as the amount of air supply increases, the power of the exhaust fan 56 is also increased to increase the amount of exhaust. Inverter control and an increase in the number of operating fans can be considered as means for increasing the amount of air supply and exhaust amount. Further, when the inside of the room 10 is to be dried, it is preferable to operate the ceiling fan 57 to forcibly flow the air in the room 10 toward the ceiling. As a result, the inside of the room 10 can be dried quickly, the ceiling, which is particularly difficult to dry, can be quickly dried, and the air containing moisture can be quickly exhausted to the outside, which makes the generation of dew condensation and mold more effective. Will be able to prevent.

Further, when the inside of the chamber 10 is dried, the supply of the heat medium to the heat exchanger 45 of the return air processing air conditioner 21 may be stopped. Alternatively, in the return air treatment air conditioner 21, the return air RA discharged from the chamber 10 is taken into the return air treatment air conditioner 21, and the air supply SA heat-treated by the return air treatment air conditioner 21 is supplied to the air supply chamber 15. You may.

Although the embodiments of the present invention have been described above, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.

FIG. 1 shows a form in which the outside air processing air conditioner 20 that processes the outside air OA and the return air processing air conditioner 21 that processes the return air RA are separately separated, but the outside air OA and the return air RA are introduced into the same air conditioner. You may process it. When the outside air processing air conditioner 20 that processes the outside air OA and the return air processing air conditioner 21 that processes the return air RA are separately separated as in the embodiment shown in FIG. 1, for example, in the outside air processing air conditioner 20. The supply air SA is always supplied with a constant air volume, and the return air processing air conditioner 21 has a temperature lower than that of the outside air processing air conditioner 20 (for example, the supply air SA of the outside air processing air conditioner 20 is 13 ° C.). On the other hand, the air volume of the air supply SA of the return air processing air conditioner 21 is variably supplied (10 ° C.), and the air volume of the air supply SA of the return air processing air conditioner 21 is increased or decreased according to the temperature of the work area in the room 10. By doing so, the temperature of the working area in the room 10 can be kept constant. Further, as in the embodiment shown in FIG. 1, a part of the indoor air exhausted from the suction port 16 may be discharged to the outside as an exhaust EA, and the remaining part may be reused as a return air RA. Alternatively, all the indoor air exhausted from the suction port 16 may be exhausted to the outside as an exhaust EA, or all the indoor air exhausted from the suction port 16 may be reused as a return air RA.

Here, for example, in a meat processing factory, it is required to maintain a working area in a predetermined low temperature environment (for example, 15 ° C. or lower, 10 ° C. or lower, etc.) in order to prevent the growth of bacteria during work such as processing. After the work is completed, the inside of the chamber 10 is washed, and then heat-treated air is supplied to dry the inside of the chamber 10. In order to realize the above-mentioned low temperature environment by the mixed air conditioning system, it is necessary to use a low temperature package, but since the low temperature package cannot be operated for heating, a device for supplying warm air for drying the inside of the room 10. Need to be installed separately. Examples of the model of the low temperature package product include PCTFX-P245LA (manufactured by Mitsubishi Electric Corporation) and PCTFS-P375LA (manufactured by Mitsubishi Electric Corporation).

However, in the present embodiment, since the suction port 16 is provided in the upper part of the chamber 10 as the replacement ventilation system, the return air treatment air conditioner 21 sucks in the heated air accumulated in the upper part of the chamber 10. Therefore, since the suction temperature of the return air treatment air conditioner 21 can be made higher than that of the mixed air conditioning system, a medium temperature package can be used for the return air treatment air conditioner 21. Since the heating operation is possible with the medium temperature package, it is not necessary to separately install a device for supplying warm air in order to dry the inside of the room 10 after cleaning, and the entire system can be constructed at low cost. Examples of the model of the product of the medium temperature package include RAS-AP280LVH2 (manufactured by Hitachi Appliances, Inc.).

Further, in FIGS. 3 and 4, an example in which a plurality of fins 50 are radially attached to the support member 51 has been described, but the configuration of the fins 50 attached to each outlet 17 is not limited to this form. For example, a configuration formed by punching fins from a flat plate, such as the swirl flow forming plate previously disclosed by the applicant in FIG. 5 of JP-A-9-250803, may be adopted. In any case, any configuration can be used as long as it can provide a turning component. Further, in a plurality of air outlets 17 arranged vertically and horizontally in front of the air supply chamber 15, as shown in FIG. 7, between the air outlets 17 arranged vertically and the air outlets 17 arranged horizontally. Also, the swirling components of the supply air SA blown out from the adjacent outlets 17 may be set so as to have a relationship of rotation directions opposite to each other. On the other hand, as shown in FIG. 8, between the vertically arranged outlets 17, the swirling components of the supply air SA blown out from the adjacent outlets 17 have a relationship of opposite rotation directions. The swirling components of the air supply SA blown out from the adjacent air outlets 17 may be set so as to have the same rotation direction relationship between the air outlets 17 arranged laterally. On the contrary, although not shown, between the horizontally arranged outlets 17, the swirling components of the supply air SA blown out from the adjacent outlets 17 have a relationship of rotation directions opposite to each other, but they are up and down. The swirling components of the air supply SA blown out from the adjacent air outlets 17 may be set so as to have the same rotation direction relationship with each other among the air outlets 17 arranged in the above. Further, the swirling components of the supply air SA blown out from all the air outlets 17 may be set so as to have the same rotation direction relationship. Further, the swirling component of the supply air SA blown out from each outlet 17 may be set to be irregularly in the same rotation direction or in the opposite rotation direction. The rotation direction of the swirling component of the supply air SA blown out from each outlet 17 can be arbitrarily set.

Further, when the air supply duct 31 and the air supply chamber 15 are installed in the chamber 10 as in the present embodiment shown in FIG. 1, they are connected to the upper surface of the air supply chamber 15 as shown in FIGS. 9 and 10. It is preferable to provide a cover surface 60 so as to cover the air supply duct 31. In this case, if the front surface of the cover surface 60 is arranged on the same surface as the side peripheral surface exposed in the chamber 10 including the front surface of the air supply chamber 15 having the air outlet 17, and this is extended to the ceiling surface, the chamber 10 Dust and the like generated inside do not collect on the upper surface of the air supply chamber 15, and are hygienic. For the same reason, the air supply chamber 15 and the air supply duct 31 may be housed in the wall of the chamber 10. For the cover surface 60, for example, a heat insulating panel is used. The surface may be made of SUS, a plated steel plate, a painted steel plate, or the like so as not to be corroded by cleaning.

Further, as shown in FIG. 11, the bottom surface 61 of the air supply chamber 15 may be installed by being lifted upward from the floor surface of the chamber 10 by the support member 62. In this case, if the bottom surface 61 of the air supply chamber 15 is tilted and the drain pan structure is provided with the drain port 63 at the bottom thereof, the cleaning liquid is washed when the inside of the air supply chamber 15 is washed with water during the cleaning step. Can be quickly discharged from the drain port 63, and the inside of the air supply chamber 15 can be cleaned. In order to facilitate washing the inside of the air supply chamber 15 with water, it is desirable to have a structure in which the front surface of the air supply chamber 15 can be opened, for example. Further, the front surface of the air supply chamber 15 may be protected by a mesh, punching metal, or the like. The air supply chamber 15 may be made of SUS, a plated steel plate, a painted steel plate, or the like so as not to be corroded by cleaning.

Further, although the example in which the suction port 16 is formed on the ceiling of the room 10 is shown, the suction port 16 may be provided above the wall surface. Further, the exhaust fan 55 may be omitted, and the heated air accumulated in the upper part of the chamber 10 may be sequentially pushed out by the air supply SA supplied downward in the chamber 10. Further, the air conditioning system of the present invention can be applied not only to the air conditioning of the room 10 of a food factory or the like that handles food and beverages, but also to the air conditioning of various rooms in which humans and various devices are present.

An example was given about the air conditioning system of the present invention. FIG. 12 is a graph showing the wind speed distribution at a position 1 m above the floor of the room during work. The horizontal axis and the vertical axis indicate the distance from the reference wall surface, and the wind speed distribution is shown in the range of 4 to 36 m in the X direction and 3.75 to 26.25 m in the Y direction. The wind speed of the shaded portion in the figure was 0.10 to 0.20 m / s, and the wind speed of the unmarked portion (the other portion of the shaded portion) was 0.00 to 0.10 m / s. As described above, in the air conditioning system of the present invention, the worker in the work space hardly feels the draft.

FIG. 13 is a graph showing the temperature distribution in the vertical direction of the chamber during work. The measurement positions A, B, and C are shown in FIG. As described above, in the air-conditioning system of the present invention, the working space per 1 m above the floor is about 11 ° C., and the temperature is about 16 ° C. near the ceiling, so that only the working space can be cooled to a suitable low temperature environment.

FIG. 14 is a graph showing the vertical relative humidity distribution of the chamber during work. The measurement positions A, B, and C are shown in FIG. As described above, in the air-conditioning system of the present invention, even in a wet production environment, the relative humidity near the ceiling is 80% or less, there is no dew condensation, and an environment in which mold does not easily grow can be realized.

FIG. 15 shows the case where the air conditioning operation is performed by the mixing method using the low temperature package and the case where the air conditioning operation is performed by the air conditioning system of the present invention in the summer, during work (operation), cleaning (cleaning), and drying. It is a graph which compared the power with respect to time (drying). The air-conditioning system of the present invention saves about half of the energy consumption of the conventional example of the mixing method at the time of work, cleaning, and drying.

SA Supply air OA Outside air RA Return air EA Exhaust 1 Air conditioning system 10 Room 11 Worktable 12 Worker 15 Air supply chamber 16 Suction port 17 Air outlet 17'Central axis 20 Outside air treatment air conditioner 21 Return air treatment air conditioner 22 Upper space 25 Upstream 26 Outside air intake duct 27 Roll filter 30 Downstream 31 Air supply duct 35 Heat exchanger 36 Air supply fan 37 Piping 40 Upstream 41 Return air duct 42 Downstream 45 Heat exchanger 46 Air supply fan 50 Fins 51 Support member 55 Exhaust fan 56 Exhaust duct 57 Ceiling fan 60 Cover surface 61 Bottom surface 62 Support member 63 Drain port

Claims (6)

The air conditioned by the air conditioner is supplied to the room from the air outlet provided at the bottom of the room where the work is performed, and the room air is exhausted from the suction port provided at the top of the room to exhaust the air from the room. It ’s a method of air conditioning.
The air conditioner is an outside air treatment air conditioner that heat-treats and cools the outside air to supply air to the room from the air outlet, and heat-treats and cools the return air exhausted from the room from the air outlet. Including a return air treatment air conditioner that supplies air to the room,
There is no outlet near the ceiling to blow out the air supply that has been cooled by the air conditioner.
When the work is performed in the room, the work space below the room is created by a replacement air return method in which the air supply cooled by the air conditioner is blown out from the air outlet into the room and the indoor air is exhausted from the suction port. When the temperature is below ℃ and the wind speed in the work space is below 0.20 m / s, the operator does not feel a draft, and the blown air is heated by the heat load in the room and rises to the upper part of the room, increasing the relative humidity near the ceiling. By air-conditioning the room at 80% or less, the occurrence of dew condensation near the ceiling can be prevented.
When the room is dried, the air supply heat-treated by the air conditioner is blown out into the room from the air outlet, and the room air is exhausted from the suction port .
When the work is performed in the room, the return air treatment air conditioner sucks in the indoor air heated by the heat load in the room and cools the air to supply the air, and when the room is dried, the heat treatment is performed. It is a medium-temperature package that supplies air to the air.
An air conditioning method characterized in that a separate device for supplying warm air is not provided for drying. After the work is done in the room, the room is cleaned and
The air conditioning method according to claim 1, wherein the room is washed and then dried. The second aspect of the present invention, wherein when the room is cleaned, the outside air that has not been cooled and heat-treated is used as a supply air and blown out from the air outlet into the room, and the room air is exhausted from the suction port. Air conditioning method. The air conditioning method according to any one of claims 1 to 3, wherein the amount of exhaust when drying the room is larger than the amount of exhaust when the work is performed in the room. The air conditioning method according to any one of claims 1 to 4, wherein the air outlet is provided with a swirling component to supply air and blown into the room. An air conditioning system that air-conditions the room where work is performed.
An air outlet provided in the lower part of the room, an air conditioner for supplying air to the room from the air outlet, a suction port provided in the upper part of the room, and an exhaust fan for exhausting room air from the suction port. The air conditioner includes a heat exchanger capable of heat-treating and cooling the air, and a blower fan for blowing the air heat-treated or cooled by the heat exchanger.
The air conditioner is an outside air treatment air conditioner that heat-treats and cools the outside air to supply air to the room from the air outlet, and heat-treats and cools the return air exhausted from the room from the air outlet. Including a return air treatment air conditioner that supplies air to the room,
There is no outlet near the ceiling to blow out the air supply that has been cooled by the air conditioner.
When the work is performed in the room, the air supply cooled by the air conditioner is blown out into the room from the air outlet, the indoor air is exhausted from the suction port, and the work is performed in the lower part of the room by the replacement air return method. The space is set to 15 ° C or less and the wind speed in the work space is set to 0.20 m / s or less so that the operator does not feel a draft . By air-conditioning the room with a relative humidity of 80% or less, dew condensation near the ceiling is prevented.
When the room is dried, the air supply heat-treated by the air conditioner is blown into the room from the air outlet, and the room air is exhausted from the suction port .
When the work is performed in the room, the return air treatment air conditioner sucks in the indoor air heated by the heat load in the room and cools the air to supply the air, and when the room is dried, the heat treatment is performed. It is a medium-temperature package that supplies air to the air.
An air conditioning system characterized in that a separate device for supplying warm air is not provided for drying.

Images