JP2012177521A - Outside air intake air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that effectively mixes outside air with return air within a limited space.SOLUTION: An outside air intake air conditioning system includes: an air blower for blowing air to an air-conditioned space; an air supply chamber provided upstream of the air blower; an outside air intake part for taking outside air into the air supply chamber from the outside to lead the outside air in a predetermined outside air inflow direction; a return flow part for leading the return air from the air-conditioned space into the air supply chamber in a direction crossing the outside air; and a filter for causing the outside air to permeate therethrough in the outside air inflow direction to collect foreign substances contained in the outside air, wherein grooves longitudinal in a return air inflow direction are formed in a surface of the filter on a downstream side in the outside air inflow direction, and the width of the groove is configured to converge toward an upstream side in the outside air inflow direction in a cross-section perpendicular to the return air inflow direction.

Description

  The present invention relates to an outside air intake air conditioning system using outside air cooling heat.

  Conventionally, in an IT equipment room of a data center, for example, cool air from an air conditioner is blown from a floor to a rack in which a server is stored, and air heated by the rack and raised to the vicinity of the ceiling is returned to the air conditioner. The temperature and humidity environment in the equipment room is adjusted.

  With the improvement of CPU processing capacity and the spread of blade servers, etc., the amount of heat generated in the equipment in the IT equipment room has increased, and the amount of cooling air required to cool it has increased rapidly. A lot of energy was required to cool the equipment in the IT equipment room.

  For this reason, the energy for cooling the apparatus in IT equipment room is also suppressed by taking in the low temperature outside air of winter etc. and performing outside air cooling.

JP 2008-2775 A JP 2009-127987 A JP 2004-325046 A

  When performing outside air cooling, in addition to all outside air operation in which all the air supplied to the IT equipment room is taken from the outside, mixed air operation is performed in which outside air and return air are mixed and supplied to the IT equipment room. However, if the outside air and the return air are supplied to the IT equipment room without being sufficiently mixed, a temperature distribution occurs and the room temperature varies.

  In particular, when the temperature difference between the outside air and the return air is large as in the air conditioning system of the IT equipment room, the variation in the room temperature becomes significant.

  For this reason, the amount of outside air to be taken in is limited to operate in a range in which the variation in room temperature does not increase, and there is a problem that the energy saving effect due to the outside air cooling is reduced.

  In addition, in order to uniformly mix outside air and return air having a large temperature difference, it is conceivable that a long flow path such as an underfloor chamber or a return duct is provided and a plurality of airflow conversion units are arranged. There has been a problem in that it causes complexity and enlargement.

  Then, this invention makes it a subject to provide the technique which mixes external air and return air effectively in the limited space in view of said problem.

In order to solve the above problems, the outside air intake air conditioning system of the present invention is:
A blower that blows air to the air-conditioned space;
An air supply chamber provided upstream of the blower;
An outside air intake section for taking outside air into the air supply chamber from the outside and allowing it to flow in a predetermined outside air inflow direction;
A recirculation unit for allowing return air from the air-conditioned space to flow into the air supply chamber in a direction crossing the outside air;
A filter that permeates the outside air in the direction of inflow of the outside air and collects contaminants in the outside air; and
With
A longitudinal groove in the return air inflow direction is provided on the downstream surface of the filter in the outside air inflow direction, and the groove is oriented toward the upstream side in the outside air inflow in a cross section orthogonal to the inflow direction of the return air. The shape converges (decreases) in width (concave shape).

  In the outside air intake air conditioning system, the groove portion of the filter is arranged downstream of the position where the outside air and the return air intersect, and the air mixed with the return air passing through the groove portion and the outside air that has passed through the filter is mixed with the air. The air-conditioned space may be blown with a blower.

  In the outside air intake air conditioning system, a shielding member may be provided on the upstream end face of the filter in the return air inflow direction to block the return air from flowing into the filter inside (the outside air intake side as viewed from the filter medium). .

The outside air intake air conditioning system includes a return air flow path that guides the air that has passed through the air-conditioned space to the reflux unit as return air;
A discharge section for discharging the return air to the outdoors;
A control unit that selectively controls the operating state by controlling the opening and closing of dampers provided in the outside air intake unit and the reflux unit, respectively.
According to the outside air state, the control unit
The damper of the outside air intake part is opened, the damper of the reflux part is closed, the outside air taken in from the outside air intake part is blown to the air-conditioned space by the blower, and all the air passing through the air-conditioned space is discharged from the exhaust part With all outside air driving,
The damper of the outside air intake part is closed, the damper of the reflux part is opened, and the return air returned from the reflux part to the supply chamber is blown to the air-conditioned space without taking in outside air, and passes through the air-conditioned space. A total return air operation for returning all return air to the supply chamber via the return air flow path and the return part;
The open / close state of the damper of the outside air intake unit is adjusted to limit the amount of outside air taken in, and the damper of the reflux unit is restricted to allow the outside air introduced from the outside air intake unit to the supply chamber and the return unit to An air-mixing operation in which the air mixed with the return air flowing into the air supply chamber is blown to the air-conditioned space by the blower;
Either of these may be selected.

  In the outside air intake air conditioning system, the control unit may select the all outside air operation when the absolute humidity of the outside air is within a predetermined range and the temperature of the outside air is within a predetermined range.

  In the outside air intake air conditioning system, when the absolute humidity of the outside air exceeds the predetermined range, or when the temperature of the outside air exceeds the predetermined range, the control unit selects the total return air operation. Also good.

A humidifier for humidifying the return air;
When the absolute humidity of the outside air is less than the predetermined range and the temperature of the outside air is within the predetermined range, the control unit selects the mixed air operation and humidifies the return air by the humidifier. Also good.

According to the present invention, it is possible to provide a technique for effectively mixing outside air and return air in a limited space.

It is a figure which shows the structure of the external air intake air conditioning system which concerns on 1st embodiment. It is a model perspective view of an air distributor combined filter. It is xz sectional drawing of an air distributor combined filter. It is a figure which shows the example which provided the shielding member which interrupts | blocks the inflow of ventilation in the upper part of an air distributor combined filter. It is a figure which shows the example which has arrange | positioned two or more filters for an air distribution body. It is a figure which shows the example which has arrange | positioned the air distribution body combined filter with a predetermined angle with respect to the inflow direction (y direction) of return air. It is a figure which shows the structure of the external air intake air conditioning system which concerns on 1st embodiment. It is a figure which shows the flow of the air-conditioning method in an external air intake air-conditioning system. It is a functional block diagram of the control apparatus 80 which controls each part of an external air intake air-conditioning system and implement | achieves the air-conditioning method of FIG. It is a figure which shows the control system of an external air intake air-conditioning system. It is a schematic block diagram of the modification 1. It is explanatory drawing of the air-conditioning method of the modification 1. In the modification 1, the example which provided the 1st heat exchanger in the partition part of an exhaust plenum chamber and an air supply plenum chamber is shown. It is explanatory drawing of the air conditioning method of a reference example. It is a figure which shows 2nd embodiment of an external air intake air-conditioning system. It is a figure which shows 2nd embodiment of an external air intake air-conditioning system. It is a figure which shows the example which provided the groove part of the filter for an air distribution body combined use over the whole return air inflow area | region.

  Next, embodiments of the present invention will be described with reference to the drawings. The embodiment described below is merely an example, and the present invention is not limited to the embodiment described below.

<First embodiment>
[Constitution]
FIG. 1 shows a configuration of an outside air intake air conditioning system 10 according to the first embodiment. An outside air intake air conditioning system 10 according to the first embodiment performs air conditioning in an IT equipment room (air-conditioned space) 1 provided in a data center 3 having a one-story structure, and is adjacent to the IT equipment room 1. The air conditioning machine room 2 is provided. In the example of FIG. 1, an example in which the air conditioning machine room 2 is arranged on one side of the IT equipment room 1 is shown. However, the air conditioning machine room 2 is arranged on both sides of the IT equipment room 1, Air conditioning may be performed.

  The air conditioning machine room 2 is horizontally partitioned at substantially the same height as the ceiling 13 of the IT equipment room 1 and has an upper exhaust plenum chamber 21 and a lower air supply plenum chamber 22.

  The outer wall 31 of the air conditioning machine room 2 is provided with an outside air intake 23 for taking in outside air, and the outside air inlet 23 has a casing that partitions the outside air intake gallery 24, the outside air control damper 25, and the outside air intake 23. is doing. In FIG. 1, the outside air intake gallery 24 is provided on the outside and the outside air control damper 25 is provided on the indoor side (downstream side in the outside air intake direction), but the outside air control damper 25 is provided on the outside and the outside air intake gallery 24 is provided on the indoor side. May be.

The outside air control damper 25 is opened and closed to control the amount of outside air taken in. For example, the outside air control damper 25 rotates around a rotation shaft 251 in a direction (in this example, the horizontal direction (z direction)) orthogonal to the intake direction (x direction) of the outside air 41 and the rotation shaft 251. A plurality of wings 252 are provided, and the opening is closed (fully closed) by rotating the wings 252 to a position orthogonal to the intake direction of the outside air 41 by a motor (not shown). The opening is opened by rotating it to a position parallel to the entering direction (fully opened state), and the opening area is adjusted by adjusting the turning position of the wing 252 between the fully opened state and the fully closed state.

  An air distributor filter 5 is connected to the indoor side of the outside air intake 23. The outside air intake 23 and the air distributor / filter 5 are hermetically connected, and all the outside air 41 taken from the outside air intake flows into the supply plenum chamber 22 through the air distributor / filter 5. The air distributor filter 5 removes dust from the passing outside air 41, adsorbs and decomposes chemical substances, and maintains the cleanliness of the air sent to the IT equipment room 1 within a predetermined range. The configuration of the air distributor combined filter 5 will be described in detail later.

  A return air control damper 26 is provided above the supply air plenum chamber 22 and the exhaust plenum chamber 21, that is, above the air supply plenum chamber 22. The return air control damper is opened and closed to control the amount of return air returned from the IT equipment room 1 to the IT equipment room 1 again. The return air control damper 26 is, for example, a rotating shaft 261 in a direction (horizontal direction (z direction) in this example) orthogonal to the inflow direction (y direction) of the return air 42 that takes the return air into the supply plenum chamber 22. And a plurality of wings 262 that rotate about the rotation shaft 261, and the opening is closed by rotating the wings 262 to a position orthogonal to the inflow direction of the return air 42 by a motor (not shown). Closed), the wing 262 is rotated in a direction parallel to the inflow direction of the return air 42 to open the opening (fully opened state). That is, the outside air control damper 25 is closed and the return air amount is increased by adjusting the direction in which the return air control damper 26 is opened. On the other hand, the amount of return air is reduced by adjusting the outside air control damper 25 in the opening direction and adjusting the return air control damper 26 in the closing direction.

  Further, an air outlet 27 is provided in a wall that partitions the air supply plenum chamber 22 and the IT equipment room 1, and a circulation fan 28 is provided in the vicinity of the air outlet 27 in the air supply plenum chamber 22. The circulation fan 28 is always in operation and blows return air or outside air from the air supply plenum chamber 22 to the IT equipment room 1 through the air outlet 27. A rectifier 29 is provided on the upstream side of the circulation fan 28 to regulate the flow of air flowing into the circulation fan 28. The ventilation of the circulation fan 28 keeps the inside of the IT equipment room 1 at a positive pressure, and the inflow and backflow of air from other than the circulation fan 28 are prevented.

  The IT equipment room 1 is provided with a rack 11 that stores equipment that generates heat, such as servers, switches, routers, and exchanges. The rack 11 is provided at a predetermined interval in a direction perpendicular to the paper surface of FIG. The low-temperature air blown out from the outlet 27 flows between the plurality of racks 11, and the low-temperature air is drawn into the rack 11 by the operation of each device or the fan provided in the rack 11, and the devices in the rack 11 are Cool down. The air heated by the cooling of the equipment is discharged from the rack 11 and is sucked into the suction port 12 provided in the ceiling 13 of the IT equipment room 1. The ceiling 13 of the IT equipment room 1 is separated from the ceiling slab 15 by a predetermined interval to partition the space between the floor slab 14 and the ceiling slab 15, and the return air flow path 6 is formed on the back of the ceiling. Yes.

  The air sucked into the suction port 12 of the ceiling 13 passes through the return air passage 6 and is returned to the exhaust plenum chamber 21 of the air conditioning machine room 2 as return air.

A heat exchanger 7 is provided in the vicinity of the partition between the exhaust plenum chamber 21 and the IT equipment room 1. The heat exchanger 7 cools the return air by exchanging heat with the return air flowing into the exhaust plenum chamber 21 from the return air flow path 6 using the heat medium from the heat source 8 provided outside. In FIG. 1, for convenience, the heat source 8 is illustrated directly above the IT equipment room 1, but this is not limited to a configuration in which the heat source 8 is provided for each IT equipment room (air-conditioning area) 1, but a central heat source (not shown). To the heat exchangers 7 in a plurality of air-conditioning areas. Further, the heat source 8 may be configured to use a refrigerator, or may be configured to perform so-called free cooling in which the heat medium is cooled by a cooling tower or the like without using the refrigerator. In this example, the heat exchanger 7 and the circulation fan 28 are arranged in the vertical direction to form two stages, thereby making the heat exchanger 7 more compact than arranging the heat exchanger 7 in front of and behind the circulation fan 28. That is, the occupation area (so-called footprint) when the heat exchanger 7 and the circulation fan 28 are vertically projected can be made compact. Moreover, the heat exchanger 7 can be arranged on the upper stage to effectively use the back of the ceiling, and a space on the lower stage side can be secured.

  A humidifier 95 is provided upstream of the heat exchanger 7 in the return air inflow direction. The humidifier 95 sprays and humidifies the return air using, for example, a vaporizing humidifier so that the return air maintains a predetermined humidity. As described above, in this example, since the high-temperature return air is humidified, the moisture quickly evaporates, and there is no possibility of wetting the IT equipment room 1 with mist.

  On the outer wall side or ceiling side of the exhaust plenum chamber 21 (in this example, the upper ceiling slab 15 side), a discharge unit 9 for discharging exhaust gas is provided. The discharge part 9 is provided on the downstream side of the exhaust control damper 91 fitted in the opening 151 provided in the ceiling slab 15, the rain lid 92 covering the upper part of the opening 151, and the exhaust control damper 91 in the exhaust direction so as to prevent rainwater and foreign matter. An exhaust gallery 93 is provided to prevent entry. In this example, the exhaust gallery 93 is provided downstream of the exhaust control damper 91 in the exhaust direction, but the exhaust gallery 93 may be provided upstream and the exhaust control damper 91 may be provided downstream.

  The exhaust control damper 91 controls the amount of air to be exhausted. The exhaust control damper 91 includes, for example, a plurality of rotating shafts 911 that are orthogonal to the exhaust direction 96 and wings 912 that rotate about the rotating shaft 911, and the wings 912 are orthogonal to the exhaust direction 96 by a motor (not shown). The opening is closed (fully closed state) by rotating to a position where the blade 912 is rotated, and the opening is opened (fully opened state) by rotating the wing 912 in a direction parallel to the exhaust direction 96, between the fully open state and the fully closed state. The opening area is adjusted by adjusting the rotational position of the wing 912.

  A guide vane 94 is provided in the exhaust plenum chamber 21. The guide vane 94 has a curved air guide plate that guides the return air flowing in horizontally to the lower supply plenum chamber 22 side, and guides the return air to flow into the supply plenum chamber 22 without causing a drift. To do.

  In addition to the above-described configuration, an external air conditioner that takes in fresh fresh air for personal use may be provided for a maintenance worker. In this case, the fresh air to be taken in is preferably 10% or less of the circulating air from another system.

  The control device 80 controls the operating state of the outside air intake air conditioning system 10 by controlling each part of the outside air intake air conditioning system 10. In the present embodiment, the control device 80 controls each part of the outside air control damper 25, the return air control damper 26, the exhaust control damper 91, the circulation fan 28, the heat exchangers 7, 70, the cooling tower 8, the humidifier 95, and the like. .

  In particular, the control device 80 performs switching control of the outdoor air control damper 25, the return air control damper 26, and the exhaust control damper 91, thereby switching the operation states such as the total return air operation, the all outside air operation, and the mixed air operation.

  For example, the control apparatus 80 controls each damper 25, 26, 91 according to the following conditions. A specific processing flow will be described later.

Condition 1: The outside air enthalpy is higher than the enthalpy of indoor return air or the outside air humidity is higher than the upper limit humidity of the predetermined temperature and humidity range. Here, the enthalpy of the indoor return air is detected by arranging a temperature / humidity sensor on the upstream side of the heat exchanger 7, for example. Further, the outside air enthalpy is detected by arranging a temperature / humidity sensor outdoors or in the outside air intake section 23, for example.

  When the condition 1 is satisfied, the outside air control damper 25 and the exhaust control damper 91 are fully closed, and the return air control damper 26 is fully opened.

  As a result, there is no introduction of outside air from the outside air control damper 25 and no exhaust from the exhaust control damper 91, and the air sent to the IT equipment room 1 by the circulation fan 28 is returned to the return air passage 6, the exhaust plenum chamber 21, and fully opened. All of the air is returned to the supply air plenum chamber 22 through the return air control damper 26, cooled by the heat exchanger 7 in the middle of the circulation path, and recirculated by the circulation fan 28, and the total return air operation is performed. The predetermined temperature / humidity range is a temperature / humidity range set in advance based on the temperature / humidity allowed or recommended according to the specifications of the devices accommodated in the IT device room 1.

Condition 2: The temperature and humidity of the outside air are within a predetermined temperature and humidity range.
When the condition 2 is satisfied, the outside air control damper 25 and the exhaust control damper 91 are fully opened, and the return air control damper 26 is fully closed. Moreover, supply of the cooling water to the heat exchanger 7 is stopped, and heat exchange is not performed.

  As a result, the outside air taken in via the outside air control damper 25 is sent to the IT equipment room 1 by the circulation fan 28 and contributes to cooling of the IT equipment room, and then reaches the exhaust plenum chamber 21 via the return air passage 6. . The air in the exhaust plenum chamber 21 is not returned to the air supply plenum chamber 22 because the return air control damper 26 is fully closed, and is all exhausted from the exhaust unit 9 via the exhaust control damper 91, and the entire outside air operation is performed. Is called.

Condition 3: Other than Conditions 1 and 2 In the case of Condition 3, for example, when the humidity of the outside air is lower than the lower limit humidity of the predetermined temperature and humidity range, the return air control damper 26 is fully opened, and the outside air control damper 25 and the exhaust control damper 91 are Adjust the degree of opening and closing. That is, the opening area of the outside air control damper 25 is made smaller than that in the fully opened state, the intake amount of outside air is limited, the opening area of the exhaust control damper 91 is adjusted, and the outside air plenum chamber 21 is maintained at a positive pressure. The air taken in from the intake part 23 is discharged. Further, the return air is humidified by the humidifier 95 to adjust the humidity of the return air.

  Then, the return air whose humidity has been adjusted is sent to the supply plenum chamber 22 via the fully open return air control damper 26, mixed with the outside air, supplied to the IT equipment room 1 by the circulation fan 28, and mixed. Qi driving is performed.

[Air distributor combined filter 5]
In the case of condition 3 above, in order to maintain a uniform temperature and humidity in the IT equipment room 1, it is necessary to generate a uniform temperature and humidity supply air by thoroughly mixing the outside air and the return air taken in. There is.

  Therefore, in the outside air intake air conditioning system 10 of the present embodiment, the air distributor combined filter 5 is arranged in the supply air plenum chamber 22.

  FIG. 2 is a schematic perspective view of the air distributor combined filter 5, and FIG. 3 is an xz sectional view of the air distributor combined filter 5. The air distributor filter 5 has a groove 51 that is long in the inflow direction (return air inflow direction (y direction in this example)) of the return air 42 on the downstream surface of the outside air 41 in the intake direction (x direction). The groove 51 has a concave shape in which the width decreases (converges) toward the upstream side in the intake direction of the outside air 41 in a cross section (xz cross section) orthogonal to the return air inflow direction.

  The return air 42 descending in the groove 51 of the air distributor / filter 5 and the outside air 41 taken in from the outside air intake 23 are orthogonal to each other.

Thus, since the air distributor combined filter 5 has the groove 51, when the outside air 41 passes through the air distributor combined filter 5, the cross section orthogonal to the return air inflow direction as shown in FIG. In the (xz cross section), it is distributed to the groove 51 from the filter blowing surface side, for example, the inclined side, and is deflected inward of the groove 51. In this case, the outside air that has flowed inward from a certain surface of the groove 51 collides with the outside air that has flowed out from the opposite surface, and the momentum of movement toward the circulation fan 28 is attenuated. For this reason, it mixes with the return air 42 which descends efficiently. Here, in order to block the return air 42 descending from the return air control damper 26 from flowing into the valley of the air distributor / filter 5, and to guide the return air 42 to the groove 51, the air as shown in FIG. A lid (shielding member) 52 that does not allow air to pass may be provided on the upper end surface of the distributor / filter 5. Further, in the present embodiment, as shown in FIG. 1, a closing plate 221 is provided to separate the return air control damper 26 side and the circulation fan 28 side from the upper end of the air distributor / filter 5 so that the return air 42 is air. The structure is such that it leads to the groove 51 of the distributor / filter 5.
As shown in FIG. 17, the groove 51 of the air distributor / filter 5 may be provided over the entire area below the return air control damper 26, that is, the entire area into which the return air 42 flows. In this case, the closing plate 221 may not be provided.

  FIG. 5 is a diagram showing an example in which a plurality of air distributor combined filters 5 are arranged. In the example of FIG. 5, the air distributor / filter 5 is disposed at a position directly below the return air control damper 26, that is, at a position intersecting with the returning return air 42, with a predetermined interval in the intake direction of the outside air 41 (x direction). Several were arranged. In this way, by increasing the number of air distributor / filters 5, that is, by increasing the number of grooves 51, the number of locations where the momentum of the outside air 41 is attenuated is increased, and the outside air 41 and the return air 42 are mixed more homogeneously. Can do.

  FIG. 6 is a view showing an example in which the air distributor combined filter 5 is arranged at a predetermined angle with respect to the inflow direction (y direction) of the return air 42.

  In the example of FIG. 6, the upper surface of the air distributor combined filter 5 (inflow direction of the return air 42) is tilted to the upstream side in the intake direction of the outside air 41, and the surface 51 </ b> A provided with the groove 51 of the air distributor combined filter 5. Are arranged obliquely upward. As a result, the return air 42 intersecting with the air distributor / filter 5 increases and the return air 42 passing through the groove 51 increases, so that the outside air 41 and the return air 42 are more effectively mixed.

  Further, in the example of FIG. 6, the return air 42 is guided to the outlet 27 side along the inclination of the air distributor / filter 5 when passing through the groove 51 of the air distributor / filter 5. The flow of 42 becomes smooth.

The inclination angle α of the air distributor / filter 5 with respect to the return air inflow direction (y direction) is, for example, 1 / of an angle β formed by the return air inflow direction (y direction) and the blowing direction by the circulation fan 28 (x direction). 2. In the example of FIG. 6, the intake direction (y direction) of the return air 42 and the blowing direction (x
Since the angle β formed with the direction) is 90 degrees, the inclination angle α of the air distributor / filter 5 is 4
5 degrees. The inclination angle α of the air distributor combined filter 5 can be arbitrarily set according to the positional relationship between the air distributor combined filter 5 and the circulation fan 28, the structure in the air supply plenum chamber 22, and the like.

  2 to 6, an example in which the xz cross section of the groove 51 is V-shaped is shown. However, the shape of the groove 51 of the air distributor / filter 5 is not limited to this. As long as the width of the groove 51 decreases toward the upstream side in the intake direction (x direction) of the outside air 41, the shape of the groove 51 may be sufficient.

  FIG. 7 is a schematic perspective view of the air distributor combined filter 5 showing an example in which the groove 51 has another shape. 7 shows an example in which the shape of the groove 51 in the xz section is a U-shape instead of the zigzag shape in FIG. Even in this case, similarly to the example of FIGS. 2 to 6 described above, the outside air 41 is distributed toward the groove 51, the outside air collides in the groove 51, and the momentum of the outside air moving toward the circulation fan 28 is attenuated. Therefore, the air can be efficiently mixed with the return air 42 descending the groove 51.

[Air conditioning method]
FIG. 8 is a diagram showing a flow of an air conditioning method in the outside air intake air conditioning system 10 having the above-described configuration, and FIG. 9 is a diagram of a control device 80 that controls each part of the outside air intake air conditioning system 10 to realize the air conditioning method of FIG. FIG. 10 is a functional block diagram showing the control system of the outside air intake air conditioning system 10.

  As shown in FIG. 10, the control device 80 is electrically connected to each part of the outside air intake air conditioning system 10. In FIG. 10, reference numeral 61 denotes a temperature / humidity sensor provided in the outside air intake unit 23, which detects the temperature and humidity of the outside air. A temperature / humidity sensor 62 is provided in the IT equipment room 1 to detect the temperature and humidity in the IT equipment room 1. 63 is a temperature / humidity sensor provided in the return air flow path, and detects the temperature and humidity of the return air.

  Further, as shown in FIG. 9, the control device 80 is a so-called computer having a microprocessor (MPU) 84, a main memory 85, a storage unit 86, an input / output unit 83, and the like.

  The input / output unit 83 is an interface that is electrically connected to each unit of the outside air intake air conditioning system 10. The input / output unit 83 inputs detection values from the temperature / humidity sensors (detection units) 61, 62, 63, the outside air control damper 25, and the return air. It outputs an open / close control signal to the control damper 26 and the exhaust control damper 91, outputs an operation control signal to the circulation fan 28, the heat exchanger 7, the heat source 8, and the humidifier 95, and the like. The input / output unit 83 is also connected to an operation unit to which set values and the like are input by a user operation, and a display unit that displays an operation state and the like.

  The storage unit 86 is a storage unit (auxiliary storage device) such as a flash memory or a hard disk, and stores an OS (operating system) and firmware (air conditioning control program) for arithmetic processing. In addition, the storage unit 86 stores setting data (such as an upper limit value and a lower limit value of the outside air temperature humidity) for controlling the IT equipment room to a target temperature and humidity range.

  The MPU 84 appropriately reads out and executes the OS and software from the storage unit 86 via the main memory (main storage device) 85, and reads information input from the input / output unit 83 according to the air-conditioning control program and the storage unit 86. By calculating the information, it also functions as a temperature / humidity information acquisition unit 65, a mode determination unit 66, a damper control unit 67, a humidification control unit 68, and a heat exchange control unit 69.

  The temperature / humidity information acquisition unit 65 acquires the temperature / humidity of the outside air, the temperature / humidity in the IT equipment room, and the temperature / humidity of the return air based on the detection values of the temperature / humidity sensors 61, 62, 63.

  The mode determination unit 66 determines an operation state (operation mode) to be selected based on the temperature / humidity information acquired by the temperature / humidity information acquisition unit 65. Specifically, operation modes such as total return air operation, all outside air operation, and mixed air operation are determined according to whether or not a predetermined control condition is satisfied.

  The damper control unit 67 controls the opening / closing of each damper by sending an opening / closing control signal to the outside air control damper 25, the return air control damper 26, and the exhaust control damper 91 according to the operation mode determined by the mode determining unit 66. To do.

  The humidification control unit 68 sends a humidification control signal to the humidification device 95 according to the operation mode determined by the mode determination unit 66 to humidify the return air so that the humidity in the IT equipment room is within a predetermined range. Control.

  The heat exchange control unit 69 controls the heat exchange amount by the heat exchanger 7 by controlling the supply of the heat medium to the heat exchanger 7.

  The control device 80 of the present embodiment shown in FIG. 9 is a computer in which the MPU 84 executes processing according to software (air conditioning control program). With this software, the temperature / humidity information acquisition unit 65, mode determination unit 66, damper control unit 67, the function of the humidification control unit 68 and the heat exchange control unit 69 is realized, but not limited to this, the temperature / humidity information acquisition unit 65, the mode determination unit 66, the damper control unit 67, the humidification control unit 68, and the heat exchange control. An apparatus in which the function of the unit 69 is realized by dedicated hardware may be used.

Here, the hardware is, for example, FPGA [Field Programmable Gate Array], AS.
It can also be realized by a circuit such as an IC [Application Specific Integrated Circuit] or an LSI [Large Scale Integration]. The hardware can also be realized by basic circuits such as an IC [Integrated Circuit], a gate array, a logic circuit, a signal processing circuit, and an analog circuit.

  As the logic circuit, for example, an AND circuit (logical product circuit), an OR circuit (logical sum circuit), a NOT circuit (negative circuit), a NAND circuit (negative logical product circuit), a NOR circuit (negative logical sum circuit), There are flip-flop circuits and counter circuits. The signal processing circuit includes a circuit that performs, for example, addition, multiplication, division, inversion, product-sum operation, differentiation, and integration on a signal value. Analog circuits include, for example, circuits that perform amplification, addition, multiplication, differentiation, and integration on signal values.

  Then, when the power is turned on by the administrator's operation, the control device 80 starts the process of FIG. First, the MPU 84 of the control device 80 acquires the temperature (dry bulb temperature) ta of the outside air and the absolute humidity tw of the outside air based on the detection value from the temperature / humidity sensor 61 (S10). The absolute humidity may be configured such that the temperature / humidity sensor 61 detects the absolute humidity, or the temperature / humidity sensor 61 detects the relative humidity, and the MPU 84 (temperature / humidity information acquisition unit 65) converts the absolute humidity into the absolute humidity. It may be a configuration.

  Next, the MPU 84 determines whether or not the absolute humidity tw of the outside air is equal to or lower than the upper limit value twH (S20). The upper limit value twH of absolute humidity is a value determined by the specifications of the IT equipment installed in the IT equipment room.

  If the absolute humidity tw of the outside air is equal to or lower than the upper limit value twH (S20, Yes), the MPU 84 determines whether or not the temperature ta of the outside air is equal to or lower than the upper limit temperature tafH of the all outside air operation (S30). The upper limit temperature tafH of the all outside air operation is the temperature of the outside air at which the temperature in the IT equipment room 1 becomes the upper limit value of the target temperature range when the all outside air operation is performed. It is set on the basis of the heat generation amount of the IT equipment installed in the fan, the air blowing amount by the circulation fan 28, and the like.

  If the temperature ta of the outside air is equal to or lower than the upper limit temperature tafH of the all outside air operation (S30, Yes), the MPU 84 determines whether or not the temperature ta of the outside air is equal to or higher than the lower limit temperature tafL of the all outside air operation (S40). Note that the lower limit temperature tafL of the all outside air operation is the temperature of the outside air at which the temperature in the IT device room 1 becomes the lower limit value of the target temperature range when the all outside air operation is performed. It is set on the basis of the heat generation amount of the IT equipment installed in the fan, the air blowing amount by the circulation fan 28, and the like.

  If the temperature ta of the outside air is equal to or higher than the lower limit temperature tafL of all outside air operation (S40, Yes), the MPU 84 determines whether or not the absolute humidity tw of the outside air is equal to or higher than the lower limit value twL (S50). The lower limit value twL of absolute humidity is a value determined by the specifications of the IT equipment installed in the IT equipment room.

  If the absolute humidity tw of the outside air is equal to or higher than the lower limit value twL (S50, Yes), the MPU 84 determines that the condition 2 is satisfied by the function of the mode determination unit 66, and sets the operation mode to the all-outside air operation. Then, by the function of the damper control unit 67, the outside air control damper 25 and the exhaust control damper 91 are fully opened, and the return air control damper 26 is fully closed (S60). In addition, the MPU 84 controls to stop the supply of the cooling water to the heat exchanger 7 and not perform heat exchange.

  As described above, if the outside air is in the predetermined temperature and humidity range, the IT device can be cooled by supplying the taken outside air to the IT device room 1 by the circulation fan 28, and therefore the outside air is cooled by the control. In addition, after performing control of step S60, it returns to step S10 and repeats a process.

  On the other hand, when the absolute humidity of the outside air exceeds the upper limit value twH in step S20, or when the temperature of the outside air exceeds the upper limit value tafH in step S30, the MPU 84 uses the function of the mode determination unit 66 to It is determined that the above condition 1 is satisfied, and the operation mode is determined to be a full return air operation. The function of the damper control unit 67 causes the outside air control damper 25 and the exhaust control damper 91 to be fully closed, and the return air control damper 26 is fully opened. A state is set (S90).

Further, the MPU 84 acquires the detection values of the temperature / humidity sensors 62, 63 by the function of the temperature / humidity information acquisition unit 65, and the heat exchange control unit 69 sets the IT equipment room 1 within the target temperature / humidity range. The amount of heat exchange (cooling water) supplied to the heat exchanger 7 is adjusted by the function to control the amount of heat exchange (S100). The heat exchanger 7 also dehumidifies the return air by cooling the return air.

  As described above, when the outside air temperature ta exceeds the upper limit value tafH, or when the absolute humidity of the outside air exceeds the upper limit value twH, the outside air cooling cannot be performed. The inside of the IT equipment room 1 is controlled to the target temperature and humidity range by cooling the air. In addition, after performing control of step S100, it returns to step S10 and repeats a process.

  When the outside air temperature ta is lower than the lower limit value tafL in step S40, or when the absolute humidity tw of the outside air air is lower than the lower limit value twL in step S50, the MPU 84 satisfies the condition 3 described above by the function of the mode determination unit 66. The operation mode is determined to be mixed air operation, the return control damper 26 is fully opened by the function of the damper control unit 67, and the open / close degree of the outside air control damper 25 and the exhaust control damper 91 is adjusted. (S70). Depending on the degree of opening and closing of the outside air control damper 25 and the exhaust air control damper 91, the mixing ratio of the return air warmed by the IT equipment and the low temperature outside air is adjusted, and the IT equipment room is maintained in the target temperature range.

Further, the MPU 84 acquires the detection values of the temperature / humidity sensors 62, 63 by the function of the temperature / humidity information acquisition unit 65, and the function of the humidification control unit 68 so that the inside of the IT equipment room 1 is within the target humidity range. Then, the humidifier 95 is controlled to humidify the return air.

  In this way, even when the outside air temperature ta is less than the lower limit value tafL, or the absolute humidity tw of the outside air is less than the lower limit value twL and is not suitable for all outside air operation, the outside air and the return air are mixed. As a result, the IT equipment room can be air-conditioned to the target temperature and humidity range, and the application period of the outside air cooling can be extended.

  Further, in the present embodiment, the use of the air distributor combined filter 5 enables the outside air 41 and the return air 42 to be effectively mixed in a limited space, and the temperature and humidity in the air conditioning area. Can be suppressed. Further, since the outside air 41 and the return air 42 can be mixed efficiently, there is no need to form a plenum chamber in the under floor space of the IT equipment room 1, and the outside air intake air conditioning system can be configured in a compact manner.

<Modification 1>
FIG. 11 is a schematic configuration diagram of the first modification, and FIG. 12 is an explanatory diagram of the air conditioning method of the first modification.

  Compared with the above-described first embodiment, the first modification differs in the configuration in which the first heat exchanger 7A that performs free cooling as a heat exchanger and the second heat exchanger 7B that is not free cooling are provided, and other configurations Are the same. For this reason, the duplicate description was abbreviate | omitted by attaching | subjecting the same code | symbol to the same element.

  Like the heat exchanger 7 described above, the first heat exchanger 7A is provided in a partition between the exhaust plenum chamber 21 and the IT equipment room 1, and cools the return air. The first heat exchanger 7A exchanges heat with the return air flowing into the exhaust plenum chamber 21 from the return air flow path 6 using a heat medium (cooling water) radiated by outside air in a cooling tower (not shown). By doing so, free cooling of the return air is performed.

  The second heat exchanger 7B is provided on the upstream side of the circulation fan 28 in the air supply plenum chamber 22 and supplies air to the IT equipment room 1 using a heat medium cooled by a refrigerator (not shown). Cool down.

  Next, the air-conditioning method of this modification 1 is demonstrated using FIG. Note that the flow of the air conditioning method of Modification 1 shown in FIG. 12 differs from that in FIG. 8 in the processing after Step S100 in the case of performing the total return air operation, and the other processes are the same. Only explained.

  When the absolute humidity of the outside air exceeds the upper limit value twH in step S20, or when the temperature of the outside air exceeds the upper limit value tafH in step S30, the MPU 84 uses the function of the mode determination unit 66 to set the above-described conditions. 1 is determined and the operation mode is determined to be a full return air operation, and by the function of the damper control unit 67, the outside air control damper 25 and the exhaust control damper 91 are fully closed, and the return air control damper 26 is fully opened. (S90).

Further, the MPU 84 acquires the detection values of the temperature / humidity sensors 62 and 63 and the temperature of the heat medium (cooling water) by the function of the temperature / humidity information acquisition unit 65, and uses the cooling water of the temperature to return the air to the return air. The heat exchange control unit 69 adjusts the amount of cooling water supplied to the first heat exchanger 7A so that the IT equipment room 1 is within the target temperature and humidity range when heat exchange is performed. The exchange amount is controlled (S100).

  Further, the MPU 84 determines whether or not the cooling by free cooling has reached the limit by the function of the heat exchange control unit 69 (S110). Whether or not the cooling by free cooling has reached the limit is, for example, when the flow rate of the cooling water is set to 100%, the detected value of the temperature / humidity sensor 62 (temperature in the IT equipment room 1) exceeds the upper limit. When the temperature of the cooling water exceeds the upper limit value of the temperature necessary for exchanging heat with the return air and maintaining the IT equipment room 1 in the target temperature range, it is determined that the limit has been reached.

When it is determined that the cooling by free cooling has not reached the limit (S110, No), the process returns to step S10 and is repeated, and when it is determined that the limit has been reached (S1)
10, Yes), control the refrigerator (not shown) for supplying the heat medium to the second heat exchanger 7B, and increase or decrease the amount of heat exchange with the return air by the second heat exchanger 7B 1 is controlled so as to be maintained within the target temperature range (S120). After step S120, the process returns to step S10 and is repeated.

  As described above, according to the first modification, free cooling is performed when the total return air operation is selected, and cooling using the refrigerator is performed only when the cooling by free cooling reaches the limit. The use period of cold heat can be further expanded, and a high energy saving effect is obtained. For example, even if the absolute humidity tw of the outside air is high and the entire outside air operation or the mixed air operation cannot be performed, if the outside air temperature ta is low, the IT equipment room can be kept in the target temperature range by free cooling.

  FIG. 12 shows an example in which the operation mode is the mixed operation when the outside air temperature ta is determined to be equal to or lower than the lower limit value tafL in step S40. However, the present invention is not limited to this. In the following cases, the operation mode may be the full return air operation, and the process may proceed to step S90. In this case, the lower limit value tafL may be an upper limit value of the outside air temperature at which full return air operation is possible by free cooling. Thus, when the outside air temperature ta is low and less than the lower limit value tafL, the total return air operation is performed, and when the outside air temperature ta is close to the target temperature in the intermediate period and is lower than the lower limit value tafL and lower than the upper limit value tafH, the entire outside air operation is performed. Alternatively, mixed air operation is performed.

  In the first modification, the first heat exchanger 7A is provided in the partition portion of the exhaust plenum chamber 21 with the IT equipment room 1 as shown in FIG. It may be provided at a position where it can be exchanged. For example, FIG. 13 shows an example in which the first heat exchanger 7 </ b> A is provided in a partition between the exhaust plenum chamber 21 and the supply plenum chamber 22.

<Reference example>
FIG. 14 is an explanatory diagram of the air conditioning method of this reference example. This reference example is different from the above-described first modification in the configuration for selecting either the all-outside air operation or the all-return air operation as the operation mode, and the other configurations are the same. For example, the device configuration of this reference example is the same as that of the first modification shown in FIGS. However, the filter 5 can be a general filter that removes dust and harmful chemical substances, instead of being used as an air distributor.

  When the power is turned on by the operation of the administrator and the processing of FIG. 14 is started, the MPU 84 of the control device 80 determines the temperature of the outside air (dry bulb temperature) ta and the outside air based on the detection value from the temperature / humidity sensor 61. The absolute humidity tw is acquired (S10).

  Next, the MPU 84 determines whether or not the absolute humidity tw of the outside air is within a predetermined range, that is, whether it is not more than the upper limit value twH and not less than the lower limit value twL (S20A).

  If the absolute humidity tw of the outside air is within the predetermined range (S20A, Yes), the MPU 84 determines whether or not the temperature ta of the outside air is within the predetermined range, that is, whether the temperature is less than or equal to the upper limit temperature tafH and the lower limit temperature tafL. Is determined (S30A). In this case, the lower limit value tafL is the upper limit value of the outside air temperature at which full return air operation is possible by free cooling.

  If the temperature ta of the outside air is within the predetermined range (S30A, Yes), the MPU 84 determines the operation mode to be all outside air operation by the function of the mode determination unit 66, and the outside air control damper by the function of the damper control unit 67. 25 and the exhaust control damper 91 are fully opened, and the return air control damper 26 is fully closed (S60). In addition, the MPU 84 performs control so as to stop the supply of cooling water to the heat exchangers 7A and 7B and not perform heat exchange.

  As described above, if the outside air is in the predetermined temperature and humidity range, the IT device can be cooled by supplying the taken outside air to the IT device room 1 by the circulation fan 28, and therefore the outside air is cooled by the control. In addition, after performing control of step S60, it returns to step S10 and repeats a process.

  On the other hand, if the absolute humidity tw of the outside air is out of the predetermined range in step S20A, or if the temperature of the outside air is out of the predetermined range in step S30A, the MPU 84 uses the function of the mode determination unit 66 to change the operation mode. Is determined to be the full return air operation, and the function of the damper control unit 67 causes the outside air control damper 25 and the exhaust control damper 91 to be fully closed, and the return air control damper 26 to be fully open (S90).

Further, the MPU 84 acquires the detected values of the temperature / humidity sensors 62 and 63 and the temperature of the heat medium (cooling water) by the function of the temperature / humidity information acquisition unit 65, and uses the cooling water of the temperature to The heat exchange control unit 69 adjusts the amount of cooling water supplied to the first heat exchanger 7A so that the IT equipment room 1 is within the target temperature and humidity range when heat exchange is performed. The exchange amount is controlled and free cooling is performed (S100).

  Further, the MPU 84 determines whether or not the cooling by free cooling has reached the limit by the function of the heat exchange control unit 69 (S110). Whether or not the cooling by free cooling has reached the limit is, for example, when the flow rate of the cooling water is set to 100%, the detected value of the temperature / humidity sensor 62 (temperature in the IT equipment room 1) exceeds the upper limit. When the temperature of the cooling water exceeds the upper limit value of the temperature necessary for exchanging heat with the return air and maintaining the IT equipment room 1 in the target temperature range, it is determined that the limit has been reached.

  If it is determined that the cooling by free cooling has not reached the limit (S110, No), the process returns to step S10 and the process is repeated. If it is determined that the limit has been reached (S110, Yes), the second heat The refrigerator (not shown) that supplies the heat medium to the exchanger 7B is controlled, and the amount of heat exchange with the return air by the second heat exchanger 7B is adjusted to keep the IT equipment room 1 in the target temperature range. Control is performed as follows (S120). After step S120, the process returns to step S10 and is repeated.

  As described above, according to this reference example, when the outside air temperature ta is low and less than the lower limit value tafL, free cooling is performed, and in the intermediate period, the outside air temperature ta is close to the target temperature, and is lower than the lower limit value tafL and lower than the upper limit value tafH. In this case, since the entire outside air operation is performed, in addition to the period during which free cooling is possible, the outside air cooling can be used by the all outside air operation even in the intermediate period when the outside air temperature ta is close to the target temperature, so that a high energy saving effect is obtained .

  In addition, while obtaining high energy saving effect by outside air cooling, the period of taking in outside air can be suppressed to the minimum (only in the intermediate period), so dust and dirt in the outside air can be affected by the impact of yellow sand, volcanic eruption, typhoon, etc. Even if it contains a lot of sea salt and gas substances, it has little effect.

<Second embodiment>
FIGS. 15 and 16 are diagrams showing a second embodiment of the outside air intake air conditioning system 10. The outside air intake air conditioning system 10 of the second embodiment shows an example applied to a data center 30 having a multi-story structure. In the first embodiment described above, the discharge unit 9 is provided above the air conditioning machine room 2, but in the second embodiment, the configuration provided on the exhaust shaft side communicating with the outside air is different. Note that elements having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and redundant description thereof will be omitted, and configurations different from those of the first embodiment will be mainly described.

In the outside air intake air conditioning system 10 of the second embodiment, the air conditioning machine room 2 is provided at both ends of the IT equipment room 1, and the exhaust shaft 90 communicating with the outside air is provided in the middle of the IT equipment room 1.

  The discharge portion 9 of the second embodiment is provided on the exhaust shaft 90 side of the return air flow path 6. The discharge unit 9 has an exhaust gallery 93 on the downstream side in the exhaust direction, and has an exhaust control damper 91 on the upstream side.

  Further, a return air control damper 26 is provided in a partition portion between the air conditioning machine room 2 and the IT equipment room 1, that is, in the vicinity of the upstream or downstream side of the heat exchanger 7 (downstream side in FIG. 15).

  A plurality of floors of heat sources (cooling towers, etc.) 8 are arranged together on the roof of the data center 30.

  The air sent to the IT equipment room 1 by the circulation fan 28 cools the equipment in the rack 11, and then is sucked into the suction port 12 of the ceiling 13 and returns to the air conditioning machine room 2 through the return air flow path 6. The return air returned to the air conditioning machine room 2 is guided downward by the guide vane 94 via the heat exchanger 7 and the return air control damper 26. The return air guided downward is lowered in the groove 51 of the air distributor / filter 5 as described above, and is effectively mixed with the outside air taken in from the outside air intake 23. In the second embodiment, the return air control damper 26 and the guide vane 94 constitute a recirculation unit that allows the return air 42 to flow in a direction intersecting the outside air 41.

  In the second embodiment, the downstream side of the return air control damper of the air conditioning machine room 2 functions as the air supply plenum chamber 22.

  The control of each damper 25, 26, 91 accompanying the total return air operation, the all outside air operation, the outside air intake amount control and the humidification control operation is the same as described above.

  15 and 16, the multi-story data center is provided with an exhaust plenum chamber 21 above the air-conditioning machine room 2 and a discharge section 9 on the outer wall side in the same manner as in the first embodiment shown in FIG. In other words, if the outside air intake portion 23 and the discharge portion 9 are arranged vertically on the same outer wall, the air discharged from the lower floor discharge portion 9 is taken in from the upper floor outside air intake portion 23, and the exhaust air A short circuit may occur.

  For this reason, in the second embodiment, as shown in FIG. 16, the outside air intake portion 23 of each floor is arranged on the outer wall of the data center 30, and the discharge portion 9 of each floor is arranged on the exhaust shaft 90 side to form a short circuit. It is preventing.

  Although the preferred embodiments of the present invention have been described above, the cooling system according to the present invention is not limited to these, and can include combinations thereof as much as possible.

1 ... IT equipment room,
10 ... Outside air intake air conditioning system,
11 ... Rack,
12 ... Suction port,
13 ... ceiling,
14 ... floor slab 15 ... ceiling slab,
151. Opening,
2 ... Air conditioning machine room,
21 ... Exhaust plenum chamber,
22 ... Air supply plenum chamber,
23 ... Outside air intake section,
24 ... Garari for taking in outside air,
25 ... outside air control damper,
251 ... Rotating shaft,
252 ... feathers,
26 ... Return air control damper,
261 ... rotating shaft,
262 ... feathers,
27 ... Air outlet,
28 ... circulation fan,
29 ... rectifier,
3, 30 ... data center,
31 ... Outer wall,
41 ... Outside air,
42 ... return air,
5 ... Air distributor filter
51 ... groove,
52 ... lid,
6 ... Return air flow path,
61 ... temperature / humidity sensor,
62 ... temperature / humidity sensor,
65 ... temperature and humidity information acquisition unit,
66 ... mode decision unit,
67 ... Damper control unit,
68 ... Humidification control unit,
69 ... heat exchange control unit,
7 ... heat exchanger,
7A ... first heat exchanger,
7B ... Second heat exchanger,
8 ... heat source,
80 ... control device,
83 ... input / output unit,
84 ... MPU,
85 ... Main memory,
86: Storage unit,
9 ... discharge section,
90 ... exhaust shaft,
91 ... Exhaust control damper,
911 ... Rotating shaft,
912 ... feathers,
92 ... rain cover,
93 ... exhaust louver,
94 ... Guide vane,
95 ... Humidifier,
96 ... exhaust direction,

Claims (8)

A blower that blows air to the air-conditioned space;
An air supply chamber provided upstream of the blower;
An outside air intake section for taking outside air into the air supply chamber from the outside and allowing it to flow in a predetermined outside air inflow direction;
A recirculation unit for allowing return air from the air-conditioned space to flow into the air supply chamber in a direction crossing the outside air;
A filter that permeates the outside air in the direction of inflow of the outside air and collects contaminants in the outside air; and
With
A groove that is long in the return air inflow direction is provided on the downstream surface of the filter in the outside air inflow direction, and the groove converges toward the outside in the outside air inflow direction in a cross section orthogonal to the inflow direction of the return air. An outside air intake air conditioning system that is shaped.   The groove portion of the filter is disposed at a position where the outside air and the return air intersect, and the mixed air of the return air passing through the groove portion and the outside air that has passed through the filter is blown to the air-conditioned space by the blower. The outside air intake air conditioning system according to 1.   The outside air intake air conditioning system according to claim 1 or 2, wherein a shielding member for blocking the return air from flowing into the filter is provided on an upstream end face of the filter in the return air inflow direction. A return air flow path that leads the air that has passed through the air-conditioned space as return air to the reflux section;
A discharge section for discharging the return air to the outdoors;
A control unit that selectively controls the operating state by controlling the opening and closing of dampers provided in the outside air intake unit and the reflux unit, respectively.
According to the outside air state, the control unit
The damper of the outside air intake part is opened, the damper of the reflux part is closed, the outside air taken in from the outside air intake part is blown to the air-conditioned space by the blower, and all the air passing through the air-conditioned space is discharged from the exhaust part With all outside air driving,
The damper of the outside air intake part is closed, the damper of the reflux part is opened, and the return air returned from the reflux part to the supply chamber is blown to the air-conditioned space without taking in outside air, and passes through the air-conditioned space. A total return air operation for returning all return air to the supply chamber via the return air flow path and the return part;
The open / close state of the damper of the outside air intake unit is adjusted to limit the intake amount of outside air, and the damper of the reflux unit is closed, and the outside air taken into the supply chamber from the outside air intake unit and the return unit from the return unit An air-mixing operation in which the air mixed with the return air flowing into the air supply chamber is blown to the air-conditioned space by the blower;
The outside air intake air conditioning system according to any one of claims 1 to 3, wherein any one of the above is selected.   The outside air intake air conditioning system according to claim 4, wherein when the absolute humidity of the outside air is within a predetermined range and the temperature of the outside air is within a predetermined range, the control unit selects the all outside air operation.   The outside air intake according to claim 5, wherein when the absolute humidity of the outside air exceeds the predetermined range, or when the temperature of the outside air exceeds the predetermined range, the control unit selects the full return air operation. Air conditioning system. A humidifier for humidifying the return air;
When the absolute humidity of the outside air is less than the predetermined range and the temperature of the outside air is within the predetermined range, the control unit selects the mixed air operation and humidifies the return air by the humidifier. Item 7. The outside air intake air conditioning system according to Item 5 or 6.   The outside air intake according to any one of claims 1 to 7, wherein the groove has a concave shape whose width decreases toward the upstream side in the outside air inflow direction in a cross section orthogonal to the inflow direction of the return air. Air conditioning system.

Images