JP2009063225A - Indoor cooling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve air conditioning efficiency in a simple constitution in an indoor cooling method. <P>SOLUTION: This indoor cooling method for cooling a room S, which is partitioned into three layers of an attic S<SB>1</SB>, a room S<SB>2</SB>and an underfloor space S<SB>3</SB>by a suspended ceiling 6 and a double flooring 7, using outside air introduced from the outdoor space and air circulating in the indoor space, is characterized in selectively executing either of a first step or a second step according to an outdoor air temperature. In the first step (steps A30-50), the outside air is introduced into the room S<SB>2</SB>using the attic S<SB>1</SB>and the underfloor space S<SB>3</SB>as a ventilation duct and exhausts the indoor air to the outdoor space. In the second step (steps A60-80), the air in the room S<SB>2</SB>is circulated using the attic S<SB>1</SB>and the underfloor space S<SB>3</SB>as the ventilation duct. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooling method for air-conditioning a room partitioned into three layers under a ceiling, a room, and a floor using outside air introduced from the outside and air circulating in the room.

2. Description of the Related Art Conventionally, an air conditioning system that adjusts the temperature and humidity of a room using a heat exchanger has been developed with a function of cooling the outside air by introducing the outside air into the room.
For example, Patent Document 1 discloses an air supply duct that introduces outdoor air from the outside to an air conditioner provided on the ceiling side of the room, an air duct that recirculates indoor air to the air conditioner, and outside air and cold air. The thing which connected the three ducts of the exhaust duct for blowing out indoors is described.

  This air conditioner is provided in a room having an openable and closable open air exhaust opening, and is controlled to open and close the open air exhaust opening and the open air duct according to the enthalpy and dry bulb temperature of the open air and the open air. . With such a configuration, it is possible to deal with both an indoor air conditioning system that circulates air only in a room and an outdoor air cooling system that performs indoor cooling using outside air.

Applicable objects of the air conditioning system as described above include not only living rooms and article warehouses, but also so-called computer rooms and server rooms in which high-load computers (electronic computers) are arranged at high density. Computers have operating environment conditions such as operating temperature and operating humidity range in which they operate stably. Therefore, in a computer room where many computers are installed, indoor air conditioning and outdoor air cooling are always performed by an air conditioning system. A certain range of room temperature and humidity is maintained.
JP 2000-121130 A

  By the way, a general computer room has an underfloor space formed by a free access floor (double floor). Based on the layout plan according to the type, number, size, etc. of computers, the power supply of each computer, Wiring materials for communication are wired and stored in the space under the floor. On the other hand, the ceiling side of the room is a suspended ceiling, and the space above it is used as a space for lighting and air conditioning equipment. That is, the entire computer room is divided into three layers, and the computers are arranged in the middle layer.

  Therefore, in the air conditioning system as described in Patent Document 1 described above, there is a problem in that the flow of air under the floor of the computer room or behind the ceiling becomes slow, and heat bias tends to occur. In particular, in a computer room where a plurality of server machines are juxtaposed, the flow of air is hindered by the machine body of the server machine, or partly stagnate, so the control temperature of the air conditioning system must be set low. Therefore, power consumption increases.

It is also conceivable to improve the indoor cooling efficiency by arranging the computer in consideration of the flow of air blown from the air conditioner. However, in this case, when the number of computers is increased, it is necessary to reexamine the room layout from the beginning. Such problems in air conditioning planning become more prominent as the size of the computer room increases.
In recent years, there are also problems in information security. That is, physical information security measures are desired in a computer room where a computer (server machine) that handles company secret information is installed, and entrance / exit management by locking, fingerprint authentication, or the like may be performed. On the other hand, in a normal air conditioning system, periodic maintenance of the air conditioner such as filter replacement and drain pan cleaning is required. Therefore, when an air conditioner is installed in the computer room, the management procedure becomes complicated, for example, maintenance work is performed in the presence of an information manager.

  This invention is made | formed in view of such a subject, and it aims at providing the indoor cooling method which can improve air-conditioning efficiency with a simple structure. Furthermore, it aims at providing the indoor cooling method which can improve the security of the space used as air-conditioning, ensuring an air-conditioning function.

  In order to achieve the above object, the indoor cooling method according to the first aspect of the present invention is the outdoor air introduced from the outside into a room partitioned into three layers of a ceiling back, a room, and a floor under a suspended ceiling and a double floor. And a cooling method for air-conditioning in an air-conditioning indoor unit using air circulated in the room, wherein the outside air is introduced into the room using the back of the ceiling and the floor as a ventilation duct, and the indoor air is A first step of exhausting the outdoor, a second step of circulating the air in the room using the back of the ceiling and the underfloor as a ventilation duct, and the first step and the second step according to the outdoor temperature And a third step of selecting and implementing any of the above.

  Further, the indoor cooling method of the present invention according to claim 2 is the indoor cooling method according to claim 1, wherein the room is divided into a plurality of small rooms by a partition wall, and in the first step, The outside air is introduced into the air conditioning indoor unit installed in one of the plurality of small rooms, and the outside air is introduced from the air conditioning indoor unit to another small room using the underfloor as a ventilation duct. In the second step, the air behind the other small room is circulated with the air conditioner using the back of the ceiling and the under floor as ventilation ducts.

According to a third aspect of the present invention, there is provided the indoor cooling method of the present invention, in addition to the configuration of the first or second aspect, in the third step, when the air temperature is equal to or lower than a predetermined temperature set in advance. One step is selected and executed, and when the air temperature exceeds the predetermined temperature, the second step is selected and executed.
According to a fourth aspect of the present invention, there is provided the indoor cooling method of the present invention, wherein an outside intake damper is provided on a flow path for circulating the outside air from the outside to the back of the ceiling, and controls the flow rate of the outside air. An exhaust shutter that is disposed on the flow path of the exhaust discharged to the outside and controls the flow rate of the exhaust; a control device that controls opening and closing of the external intake damper and the exhaust shutter; and a temperature sensor that detects the air temperature; The room cooling method according to claim 3, wherein the air temperature detected by the temperature sensor is input to the control device in the third step, and the control device in the first step. The outer intake damper and the exhaust shutter are opened, and the outer intake damper and the exhaust shutter are closed by the control device in the second step.

According to a fifth aspect of the present invention, in addition to the configuration of any one of the first to fourth aspects of the present invention, in addition to introducing the outside air into the room, the outside air is sprayed by watering. A fourth step of cooling is further provided.
According to a sixth aspect of the present invention, in addition to the structure of any one of the first to fifth aspects, the indoor air exhausted in the first step is transferred to another room. It is characterized by further including a fifth step.

According to the indoor cooling method of the present invention (Claim 1), the air flow is formed in the entire room by causing the underfloor and the back of the ceiling to function as air conditioning ducts. It becomes difficult to occur and air conditioning efficiency can be improved. In addition, the air conditioning method can be switched according to the outdoor temperature.
Further, according to the indoor cooling method of the present invention (Claim 2), even if the room is divided into a plurality of small rooms by the partition walls, the outside air can be removed by causing the underfloor and the ceiling back to function as air conditioning ducts. Utilized cooling and ventilation or air circulation can be performed. Moreover, the space where the air-conditioning indoor unit which requires a regular maintenance is arrange | positioned can be isolated from the space for air conditioning by a partition wall. For example, when air-conditioning a space in which a server or secret document is stored, a management area can be set for each partition space by using a partition wall while functioning the back of the ceiling and the floor as an air conditioning duct. Thereby, security can be improved.

  Moreover, according to the indoor cooling method of the present invention (Claim 3), when the outside air temperature is equal to or lower than the predetermined temperature, the inside air can be cooled and ventilated using the outside air introduced from the outside. . Thereby, the cost concerning cooling can be reduced. Further, when the outside air temperature exceeds a predetermined temperature, air circulates in the room, so that the temperature rise in the room due to the outside air can be prevented, and energy for cooling can be saved.

Further, according to the indoor cooling method of the present invention (Claim 4), it is possible to automatically control cooling and ventilation using outside air or switching of air circulation with a simple configuration.
Moreover, according to the indoor cooling method (Claim 5) of the present invention, the temperature of the outside air introduced into the room can be lowered by watering, and the cooling efficiency can be increased with a simple configuration. Moreover, the air-conditioning cost concerning cooling can be reduced.

  Moreover, according to the indoor cooling method (Claim 6) of the present invention, the heat of the air warmed in the room can be reused in the other room, and the air conditioning cost for heating the other room can be reduced. it can.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1-3 is for demonstrating the air-conditioning system to which the indoor cooling method of this invention was applied, FIG. 1 is a schematic diagram which shows the whole structure of this air-conditioning system, FIG. 2 is in this air-conditioning system FIG. 3 is a flowchart showing the contents of control in this air conditioning system.

  4 is a schematic diagram showing the overall configuration of an air conditioning system in which a cooling method according to a modification of the present invention is implemented, FIG. 5 is a block configuration diagram showing the configuration of a controller in the air conditioning system, and FIG. It is a flowchart which shows the control content in a system. 7 and 8 are schematic views showing the overall configuration of an air conditioning system in which a cooling method according to another modification of the present invention is implemented.

[1. Configuration of computer room]
The air conditioning system to which the indoor cooling method of the present invention is applied is applied to a computer room (room) S shown in FIG. This computer room S is one room of the RC building 20, and in this embodiment, the computer room S provided on the first floor of the building 20 will be described.
The computer room S is a substantially rectangular parallelepiped space surrounded on all sides by a wall 20a and closed up and down by a first floor slab 20b and a second floor slab 20c. The computer room S is provided with a suspended ceiling 6 and a double floor 7. The suspended ceiling 6 is obtained by suspending a steel field edge and field edge receiver assembled in a lattice shape from a ceiling structure as a base material, and attaching a ceiling board and finishing material thereto. A space behind the ceiling (hereinafter simply referred to as the ceiling) S ₁ between the ceiling surfaces 6b, 6c of the suspended ceiling 6 and the second floor slab 20c is used as a space for lighting equipment and air conditioning equipment.

The double floor 7 is a floor provided with a finishing floor on the floor structure to secure a space for wiring and piping. In the computer room S, an under-floor space (hereinafter simply referred to as the under-floor) S ₃ between the first-floor slab 20b and the floor surfaces 7b and 7c of the double floor 7 is used as a power cable or a communication cable for OA equipment. Used for wiring.
A space between the floor surfaces 7 b and 7 c of the double floor 7 and the ceiling surfaces 6 b and 6 c of the suspended ceiling 6 is used as a room S ₂ of the computer room S. As described above, the computer room S is divided into three layers of the ceiling back S ₁ , the room S _2, and the under-floor S ₃ by the suspended ceiling 6 and the double floor 7.

The room S ₂ is divided into two small rooms by the partition wall 18. One is the computer placement room S _2A and the other is the air conditioner placement room S _2B . The computer arrangement room S _2A and the air conditioner arrangement room S _2B cannot be moved back and forth.
The computer placement room S _2A is a room where documents and computer (server machine etc.) 13 for handling confidential company information are stored and installed, and entrance / exit management is performed by a door lock for fingerprint authentication. Code 6b in the FIG. 1 shows a ceiling surface of the computer arrangement chamber S _2A, reference numeral 7b shows a floor of the computer arrangement chamber S _2A.

The air conditioner arrangement room S _2B is a room in which the air conditioner indoor unit 5 for managing the cooling of the computer arrangement room S _2A is installed, and entrance / exit management is performed by a locking system different from the computer arrangement room S _2A. Yes. Code 6c in the FIG. 1 shows a ceiling surface of the air conditioner disposed chamber S _2B, reference numeral 7c shows a floor of the air conditioner disposed chamber S _2B.
The partition wall 18 may be a movable partition in consideration of the possibility of future changes and expansion of the computer placement room S _2A and the air conditioner placement room S _2B .

The ceiling S ₁ is continuous in the horizontal direction from the upper side of the computer placement room S _{2A to} the upper side of the air conditioner placement room S _2B , and a single space is formed on all the ceiling surfaces 6b and 6c of the computer room S. Is forming. Similarly, the floor S _3, to form a single space below the total floor surface 7b, 7c of the computer room S.
As shown in FIG. 1, a ceiling hole 6a is formed in the ceiling surface 6b of the computer placement room _S2A over substantially the entire surface. In addition, the floor 7b of the computer arrangement chamber S _2A, louver 7a is formed over its substantially entire surface. This ensures air circulation from the ceiling back S ₁ to the computer placement room S _2A and under the floor S ₃ .

[2. Configuration of air conditioner]
Next, the configuration of the air conditioner applied to the computer room S will be described. The air conditioner indoor unit 5 is installed in the air conditioner arrangement room _S2B . The air-conditioning indoor unit 5 takes in outside air outside and blows it to the computer room S, and cools the computer room S by cooling the room air while cooling the room air (cooling operation). It is an air conditioner that performs two types of control. The air conditioning indoor unit 5 has a built-in control device (electronic control device) 10 so that the operating state of the air conditioning indoor unit 5 is automatically electronically controlled.

As shown in FIG. 1, an intake chamber 1 is fixedly installed on the ceiling S ₁ above the air conditioner arrangement room S _2B . The intake chamber 1 is a box-shaped member provided at a position where an outside air circulation path from the outside and an air circulation path circulated indoors merge, and the inside of the intake chamber 1 is a hollow air chamber 1a. An air conditioning indoor unit 5 is connected directly below the chamber 1 so that outside air and air flowing into the air chamber 1 a are sucked into the air conditioning indoor unit 5.

In addition, two openings, an outer intake opening 1b and an inner intake opening 1c, are formed on the side surface of the intake chamber 1. These openings 1b and 1c are arranged to face each other. In addition, one end of an intake duct 2 that is a flow path of the outside air is connected to the outside intake opening 1b. On the other hand, the inner intake opening portion 1c, the air chamber 1a of the intake chamber 1 is open to the ceiling S _1, it forms part of the distribution path of the indoor air.

The flow path of these outside air and indoor air will be described in detail. First, the intake duct 2, penetrates the side wall 20a of the outdoor side of the air conditioner disposed chamber S _2B, the other end is open to the outside air. That is, the intake duct 2 functions to connect the intake chamber 1 and the outside in communication and to introduce the outside air into the air chamber 1a.
An air intake duct cover 2a and an insect net 19 that are open downward are attached to the outermost end of the air intake duct 2 on the outdoor side. In addition, a temperature sensor 11 for detecting outdoor air temperature is fixed inside the intake duct cover 2a. This temperature sensor 11 detects the temperature (outside air temperature) T of the outside air sucked into the intake duct 2. The detected outside air temperature T is input to the control device 10.

On the intake system path by the intake duct 2, a fire damper 14, a filter 15, an external intake damper 3, and an intake duct fan 16 are attached in order from the outdoor side. The fire prevention damper 14 is a specific fire prevention equipment used for a fire prevention section, and has a function of closing a duct by smoke or heat at the time of fire. As a result, diffusion of flames and smoke can be prevented.
The filter 15 is a filter medium that removes dust in the outside air that is sucked. In the present embodiment, a medium performance filter is used so that the air cleanliness required for stable operation of the computer 13 can be obtained.

  The external intake damper 3 is a damper that controls increase / decrease in the cross-sectional area of the flow path of external air in the intake duct 2. In the present embodiment, the intake duct 2 is controlled to be in a fully open state or a fully closed state so that the outside air is circulated or blocked. The intake duct fan 16 is a blower that generates a flow of air from the outside to the intake chamber 1 side, and can efficiently suck in the outside air during the outside air blowing operation.

The external intake damper 3 is controlled to be opened and closed by an external intake damper motor 3a disposed adjacent thereto. Further, the external intake damper motor 3 a is automatically controlled by the control device 10.
As shown in FIG. 1, an air intake fan 5 a for sucking air into the air conditioning indoor unit 5 from the intake chamber 1 side is provided inside the air conditioning indoor unit 5. An air intake fan cover 5c is enclosed between the air conditioning indoor unit 5 and the air intake chamber 1, so that air in the air intake chamber 1 is introduced into the air conditioning indoor unit 5 without leaking. Intake fan cover 5c is communicatively connected to through the ceiling surface 6c of the air conditioner disposed chamber S _2B and the inlet chamber 1 and the air conditioning indoor unit 5.

  In addition, a heat exchanger (not shown) for adjusting the temperature of the air introduced from the intake chamber 1 is provided inside the air conditioning indoor unit 5. For example, during the inside air cooling operation, the refrigerant cooled by an outdoor unit (not shown) is circulated to the heat exchanger and the introduced air is circulated on the surface of the heat exchanger to cool the air. Further, during the outside air blowing operation, the circulation of the refrigerant is stopped and the outside air is simply blown.

Although not described in detail here, the air conditioning indoor unit 5 is an air conditioner that can perform both cooling and heating, and the air introduced from the intake chamber 1 does not enter the operating temperature range of the computer 13. When the temperature is low, the temperature of the air can be increased.
On the bottom surface of the air conditioning indoor unit 5, there is provided an air outlet 5 d for supplying the air introduced into the air conditioning indoor unit 5 to the underfloor S ₃ . As shown in FIG. 1, a pan-type humidifier 5b for adjusting the humidity of the air is provided inside the air conditioning indoor unit 5, and a factory steam pipe 5e is introduced. Inside the factory steam pipe 5e, steam generated in a factory steam boiler installed near the building including the computer room S is circulated. The air conditioner indoor unit 5 adjusts the humidity of the air supplied to the underfloor S ₃ by using the water vapor generated in the pan-type humidifier 5b and the steam in the factory steam pipe 5e.

The computer arrangement room S _2A is provided with an exhaust duct 9 that passes through the outdoor side wall 20a and is opened to the outside air. The exhaust duct 9 has a function of exhausting outside air by connecting the computer arrangement room S _2A and the outside in communication. In addition, the exhaust duct cover 9a and the insect net 19 that are opened downward are attached to the outermost end of the exhaust duct 9 in the same manner as the intake duct 2.

A fire damper 14, a filter 15, an exhaust shutter 8, and an exhaust duct fan 17 are attached to the exhaust system path by the exhaust duct 9 in order from the outdoor side. The fire damper 14 is the same as described above. On the other hand, the filter 15 may be the same as that described above, but the amount of dust newly generated in the computer placement room S _2A is very small, and therefore a simpler filter (for example, a coarser filter than the medium performance filter). It is good.

The exhaust shutter 8 is a damper that controls increase / decrease in the cross-sectional area of the exhaust passage in the exhaust duct 9. In the present embodiment, the exhaust duct 9 is controlled to be in a fully open state or a fully closed state so that the exhaust gas is circulated or blocked. Further, the exhaust duct fan 17 is a blower device for urging the exhaust to the outside, and thereby, the exhaust duct fan 17 can be efficiently exhausted during the outdoor air blowing operation.
The exhaust shutter 8 is controlled to be opened and closed by an exhaust shutter motor 8a provided therewith. The exhaust shutter motor 8 a is automatically controlled by the control device 10.

[3. Control configuration]
FIG. 2 is a control block diagram of an air conditioning system to which the indoor cooling method of the present invention is applied. The control device 10 built in the air conditioning indoor unit 5 controls the open / closed state of the external intake damper 3 and the exhaust shutter 8 based on an input signal from the temperature sensor 11, and includes an external air temperature determination unit 10a and air conditioning control. It comprises a unit 10b and a damper control unit 10c.

[3-1. Outside air temperature determination unit]
The outside air temperature determination unit 10a determines whether to perform the outside air blowing operation or the inside air cooling operation based on the outside air temperature T input from the temperature sensor 11. Here, when the outside air temperature T is equal to or lower than a predetermined temperature T ₀ set in advance, it is determined that the outside air blowing operation should be performed.

The predetermined temperature T ₀ here is an outside air temperature that is expected to maintain the room temperature of the computer placement room S _2A within the operating temperature range of the computer 13 if the outside air is introduced without performing the inside air cooling operation. Means that. In the present embodiment, the predetermined temperature T ₀ is set to 20 ° C.
On the other hand, when the outside air temperature T exceeds the predetermined temperature T ₀ , it is determined that the inside air cooling operation should be performed. The determination result in the outside air temperature determination unit 10a is transmitted to the air conditioning control unit 10b and the damper control unit 10c.

[3-2. Air conditioning control unit]
The air conditioning control unit 10b selects one of the outside air blowing operation and the inside air cooling operation based on the determination result in the outside air temperature determination unit 10a, and implements it.
First, when it is determined that the outside air blowing operation should be performed, the refrigerant circulation with the air conditioner outdoor unit (not shown) is stopped, and the air sucked from the intake fan 5a is blown out from the air blowing port 5d as it is. To implement. That is, in this case, only air is blown without cooling the air.
On the other hand, when it is determined that the inside air cooling operation should be performed, the heat exchanger is operated, and the air sucked from the intake fan 5a is cooled and blown out from the air blowing port 5d. That is, in this case, general cooling control is performed.

[3-3. Damper control unit]
The damper control unit 10c controls the external intake damper motor 3a and the exhaust shutter motor 8a based on the determination result in the external air temperature determination unit 10a, and opens and closes the external intake damper 3 and the exhaust shutter 8.

  First, when it is determined that the outside air blowing operation should be performed, the outside intake damper 3 and the exhaust shutter 8 are opened. For example, the openings of the external intake damper motor 3a and the exhaust shutter motor 8a are controlled so that the amount of air taken in from the external intake damper 3 and the amount of air blown out from the exhaust shutter 8 are equal. On the other hand, when it is determined that the inside air cooling operation should be performed, the outside intake damper 3 and the exhaust shutter 8 are closed.

[4. flowchart]
The air conditioning system to which the indoor cooling method according to the embodiment of the present invention is applied performs control according to the flowchart shown in FIG. Note that this flowchart is repeatedly executed as appropriate within the control device 10.
First, in step A <b> 10, the outside air temperature T detected by the temperature sensor 11 is input to the control device 10. In subsequent step A20 (third step), the outside air temperature determination unit 10a of the control device 10 compares the preset predetermined temperature T ₀ with the outside air temperature T. Here, if T ≦ T _0, the process proceeds to step A30 in order to maintain the room temperature of the computer placement room S _2A using outside air.

In step A30, the external intake damper 3 is opened in the damper controller 10c, and the exhaust shutter 8 is opened in the subsequent step A40. And in step A50, the air-conditioning control part 10b implements an external air blowing operation, and this flow is completed. These steps A30~ step A50 is intended to introduce the outside air into the room S ₂ the ceiling S ₁ and underfloor S ₃ is used as ventilation ducts, and corresponds to the first step of discharging the indoor air to the outdoor is there.

The ambient air blowing operation, relatively cool outside air is supplied from the air blowing port 5d of the air conditioning indoor unit 5 to the underfloor S _3. Outside air flows into the underfloor S ₃ of the computer arrangement chamber S _2A side, blown out louver 7a drilled in the floor 7b of the computer arrangement chamber S _2A.
Since louver 7a is formed on substantially the entire surface of the floor surface 7b, the outside air blown out from the louver 7a flows substantially uniformly with respect to each place of the computer arrangement chamber S _2A, to cool the entire computer arrangement chamber S _2A. Thus, the underfloor S ₃ functions as an air supply duct to the computer placement room S _2A, and an air flow (air flow) is formed.

Since the exhaust shutter 8 is opened, the air warmed in the computer placement room S _2A is exhausted outside the room. That is, not only the computer placement room S _2A is cooled but also ventilated.
If T> T _{0 in} step A20, the process proceeds to step A60 to perform cooling control without using outside air. In step A60, the external intake damper 3 is closed in the damper controller 10c, and in step A70, the exhaust shutter 8 is closed. In step A80, the inside air cooling operation is performed in the air conditioning control unit 10b, and this flow ends. These steps A60~ step A80 is a step corresponding to the second step of refluxing the air of the room S ₂ with ceiling S ₁ and the floor under S ₃ as ventilation ducts.

The inside air cooling operation, air cooled by the heat exchanger is supplied to the underfloor S _3. The air is blown out from the louver 7a of the floor surface 7b to the entire computer arrangement chamber S _2A. Thereby, the whole computer arrangement room _S2A is cooled.
On the other hand, the air in the computer placement room S _2A flows from the ceiling hole 6a formed in the ceiling surface 6b to the ceiling back S ₁ . That is, a substantially vertical air flow is generated from the floor surface 7b toward the ceiling surface 6b. Further, since the open inner intake opening 1c in the intake chamber 1, ceiling S ₁ functions as a duct for the suction air, the air ceiling S ₁ is sucked into the intake chamber 1. As a result, a circulating air flow is formed, and the air in the computer arrangement room S _2A circulates while being cooled. At this time, since the outside intake damper 3 and the exhaust shutter 8 are closed, air does not flow between the computer placement room S _2A and the outside, and temperature rise in the room due to outside air is prevented.

[5. effect]
Thus, according to the cooling method in the main room, the air-conditioning method of the outside air blowing operation or the inside air cooling operation can be switched according to the outside air temperature T. Further, by causing the ceiling back S ₁ and the underfloor S ₃ to function as air conditioning ducts, an air flow is formed in the entire computer placement room S _2A , so that a heat bias occurs in the ceiling back S ₁ and under the floor S _3. Air conditioning efficiency can be improved.

Further, during the outside air blowing operation, the computer room S can be automatically cooled using the outside air, and energy related to cooling can be saved. In particular, a large energy saving effect can be obtained in air conditioning control of a server room or an electrical room where a machine with a large amount of heat is installed.
On the other hand, since the outside air does not flow into the computer room S during the inside air cooling operation, the temperature rise in the room due to the outside air can be prevented, and the energy related to the cooling can be saved.

Further, by the ceiling S ₁ and underfloor S ₃ is made to function as an air-conditioning duct provided partition wall 18 while ensuring the flow path of air, regularly air conditioner air conditioning indoor unit 5 that requires maintenance is arranged The placement room S _2B can be isolated from the computer placement room S _2A that is the air conditioning target. For example, since the locking and entering / leaving room of the computer arrangement room S _2A are managed separately from the locking and entering / leaving room of the air conditioner arrangement room S _2B , the computer arrangement room S _2A is moved to the computer arrangement room S _2A even during maintenance of the air conditioner indoor unit 5. There is no need to enter the room. In this manner, physical information security performance can be improved while ensuring the air conditioning function in the computer placement room _S2A .

In addition, air flow from the ceiling back S ₁ to the computer placement room S _2A and the underfloor S ₃ can be ensured by a simple configuration in which the computer placement room S _2A is provided with the ceiling hole 6a and the louver 7a. It is possible to improve the air-conditioning efficiency by forming an air flow from the bottom to the top of the room. When the heat generation from the air conditioning indoor unit 5 itself is small as compared with the computer 13, the ceiling hole 6a and the gallery 7a are provided only on the computer arrangement room _S2A side, so that all the air related to the cooling is supplied to the computer. The air can be supplied to the arrangement room S _2A side, and the air conditioning efficiency of the computer arrangement room S _2A can be improved. On the other hand, when it is desired to cool the air conditioner arrangement room S _2B side, the ceiling surface 6c and the floor surface 7c of the air conditioner arrangement room S _2B may be provided with a ceiling hole or a louver to form an air flow.
Further, by supplying the outside air or air sucked into the air conditioning indoor unit 5 from the intake chamber 1, the flow rate of the outside air or air can be accurately adjusted.

[6. Modified example]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[6-1. Configuration for transferring warm air to another floor]
FIG. 4 shows an overall configuration of an air conditioning system to which the indoor cooling method according to the first modification of the present invention is applied. In addition, about the same structure as what was demonstrated by the above-mentioned embodiment, it shows in FIG. 4 using the same code | symbol, and abbreviate | omits description.
In this modification, the structure which transfers the exhaust_gas | exhaustion from the exhaust duct 9 to another floor is provided. First, a transfer duct 9b is provided at the outermost end portion on the outdoor side of the exhaust duct 9 instead of the exhaust duct cover 9a in the above-described embodiment. The transfer duct 9b is a duct that extends substantially vertically from the outermost end of the exhaust duct 9 on the outdoor side. The air heated inside the computer room S due to heat generated by the computer 13 or the like is transferred to another room (another room) by the transfer duct 9b.

As shown in FIG. 4, an office room 30 is provided on the floor directly above the computer room S. Three sides of the office room 30 are surrounded by a wall 20a, and a window glass is provided on one wall surface. Further, the upper and lower sides are closed by the second-floor slab 20c and the third-floor slab 20d to form a substantially rectangular parallelepiped space. Similar to the computer room S, the office room 30 is provided with a suspended ceiling 6. Space (ceiling) S ₄ between the ceiling surface 6b and the third floor slab 20d suspended ceiling 6 is used as a space for lighting fixtures and air conditioning equipment. Moreover, the entire space under the ceiling surface 6b is room S _5.

A branch duct 22 is arranged in the ceiling S ₄ of the office room 30 so that warm air from a second air conditioning indoor unit 25 described later can be supplied to various places in the room S ₅ . The living room S ₅ is provided with a blower 21 so that the air in the living room S ₅ is sucked from the return inlet 21a. A transfer duct 23 is connected to the air outlet 21b of the blower 21 so that air heated inside the office room 30 is also transferred to another room.

An air conditioning room S ₆ is provided on the floor directly above the office room 30. The conditioning chamber S _6, the chamber 24, the second air conditioning indoor unit 25 and the electrostatic precipitator 26 is installed. The chamber 24 is connected to the upper ends of transfer ducts 9b and 23. Further, the chamber 24, thereby making it possible to take in the outside air from the opening 28 of the ceiling surface of the air conditioning chamber S _6. A damper 29 is attached to the opening 28 so that the amount of outside air taken in can be freely controlled.

  Near the junction between the transfer ducts 9b and 23 and the chamber 24, a second temperature sensor 27a and a third temperature sensor 27b for detecting the temperature of warm air transferred from the lower floor are provided. The second temperature sensor 27 a detects the warm air temperature from the computer room S, and the third temperature sensor 27 b detects the warm air temperature from the office room 30. The opening degree of the damper 29 is controlled in accordance with the temperatures detected by these temperature sensors 27a and 27b. For example, when the warm air temperature is high, control is performed such that the opening degree of the damper 29 is increased to increase the intake amount of outside air.

The electric dust collector 26 functions to remove dust in the air in the chamber 24 and send it to the second air conditioning indoor unit 25. The second air conditioning indoor unit 25 has a built-in heat exchanger like the air conditioning indoor unit 5 in the computer room S, and is connected to an outdoor unit (not shown) by a refrigerant pipe. Thereby, the temperature of the air sent from the electric dust collector 26 can be adjusted.
With the above configuration, the warm air generated in the computer room S is transferred to the chamber 24 via the transfer duct 9b, and the warm air generated in the office room 30 is also transferred to the chamber 24 via the transfer duct 23. These warm airs are mixed in the chamber 24, cleaned by the electric dust collector 26, then blown from the second air conditioning indoor unit 25 to the branch duct 22 and supplied to various places in the office room 30.

  As described above, the heat of the air heated in the computer room S can be reused for heating the office room 30, and the cost for heating the office room 30 can be reduced. Further, as shown in FIG. 4, since the transfer ducts 9b and 23 extend substantially vertically, warm air naturally moves to the upper floor. Therefore, warm air can be transferred easily and efficiently. Moreover, since the opening degree of the damper 29 is controlled according to the warm air temperature detected by the temperature sensors 27a and 27b, the room temperature of the office room 30 can be kept moderate.

[6-2. Watering configuration]
Furthermore, as shown in FIG. 4, it is conceivable to provide a watering device (for example, a sprinkler) 12 for spraying water in the vicinity of the outdoor end of the intake duct 2. That is, the watering device 12 is provided as a means for cooling the outside air sucked into the intake duct 2. In this case, the watering device 12 is preferably controlled by the control device 10.

  For example, as shown in FIG. 5, a second control device 10 ′ having a watering control unit 10 d is provided in the air conditioning indoor unit 5 instead of the control device 10 of the above-described embodiment. The watering control unit 10d performs control to spray water from the watering device 12 when the outside air temperature determination unit 10a determines that the outside air blowing operation should be performed. That is, prior to introducing the outside air from the intake duct 2 into the room, the outside air is pre-watered.

By such control, the heat of vaporization of the sprinkled water is taken away from the air in the vicinity of the intake duct 2, and the outside air temperature is lowered. That is, compared with the case where the outside air is introduced as it is, the temperature of the outside air can be lowered, and the cooling efficiency can be increased with a simple configuration. Moreover, the air-conditioning cost concerning cooling can be reduced.
In addition, it is also a proposal to implement control according to a flowchart as shown in FIG. In this control, compared with the control of the above-described embodiment, a step of determining the outside air temperature condition for performing the watering control and the watering control is added.

First, in step B10, the outside air temperature T detected by the temperature sensor 11 is input to the control device 10 ′. In the subsequent step B20, the outside air temperature determination unit 10a compares the preset predetermined temperature T ₀ with the outside air temperature T. Here, if T ≦ T _0, the process proceeds to step B30 in order to maintain the room temperature of the computer placement room S _2A using outside air.
In step B30, the external intake damper 3 is opened in the damper control unit 10c, and the exhaust shutter 8 is opened in the subsequent step B40. And in step B50, the air-conditioning control part 10b implements an external air ventilation driving | operation, and this flow is complete | finished.

On the other hand, if T> T ₀ in step B20, it is further determined whether or not the outside air temperature T is equal to or lower than a second predetermined temperature T ₁ set in advance. The second predetermined temperature T ₁ means an outside air temperature at which the room temperature of the computer placement room S _2A is expected to be maintained within the operating temperature range in consideration of a temperature drop due to watering. In the present embodiment, the second predetermined temperature T ₁ is set to 21 ° C.

Here, when T ₀ <T ≦ T ₁ , the process proceeds to step B70 (fourth step), the watering control is performed, and the process proceeds to step B30. In other words, in this case, it is considered that the temperature is slightly high to introduce it into the computer placement room S _{2A as} it is, but it is not excessively high, and cooling of the outside air by watering is attempted.
On the other hand, in the case of T> T _1, the process proceeds to step B80. That is, in this case, the outside air temperature T is excessively high, and even if water is sprinkled, it is regarded as insufficient for the outside air blowing operation, and the inside air cooling operation is performed. That is, in step B80, the external intake damper 3 is closed in the damper controller 10c, and the exhaust shutter 8 is closed in step B90. In step B100, the inside air cooling operation is performed in the air conditioning control unit 10b, and this flow ends.
By such control, the range of the outside air temperature T where the outside air blowing operation is performed can be expanded, the cooling efficiency can be further increased, and the air conditioning cost related to cooling can be reduced.

[6-3. Configuration for transferring warm air to another floor 2]
FIG. 7 shows an overall configuration of an air conditioning system to which an indoor cooling method according to a second modification of the present invention is applied. In addition, about the same structure as what was demonstrated by the above-mentioned embodiment, it shows in FIG. 7 using the same code | symbol, and abbreviate | omits description.

This modification has a simplified configuration of the first modification. An office room (another room) 40 is provided immediately above the computer room S. The office room 40 is surrounded on all sides by a wall 20a, and the upper and lower sides are closed by a second floor slab 20c and a third floor slab 20d. The office 40, the ceiling 6 is provided suspended in the same manner as computer room S, between the ceiling surface 6b and the third floor slab 20d suspended ceilings 6 space (ceiling) S ₄ is lighting equipment and air conditioning equipment It is used as a space for.

Moreover, the entire space under the ceiling surface 6b is room S _5. The ceiling surface 6b of the office 40 are ceiling hole 6a is formed over its substantially entire surface, the distribution of air from the ceiling S ₄ to room S ₅ is ensured.
The room S _5, the third air conditioning indoor unit 35 is installed. The third air conditioning indoor unit 35 has a built-in heat exchanger like the air conditioning indoor unit 5 in the computer room S, and is connected to an outdoor unit (not shown) by a refrigerant pipe.

A second intake chamber 33 is fixed to the ceiling S ₄ of the office room 40. A hollow air chamber 33 a is formed inside the second intake chamber 33. Further, two openings, a second inner intake opening 33 b and a transfer intake opening 33 c, are formed on the side surface of the second intake chamber 33.
The second inner intake opening 33b functions as an intake port for circulating air inside the office room 40. The second internal intake opening 33b is provided with an air damper 32 and an air damper motor 32a. Thus, the air in the ceiling S ₄ can be sucked into the air chamber 33 a side of the second intake chamber 33. The air damper 32 is controlled to be opened and closed by an air damper motor 32a provided therewith. As a result, the amount of air drawn from the second inner intake opening 33b can be adjusted. Note that the amount of air can also be controlled by the air duct fan 34.

The transfer intake opening 33c functions as a suction port for receiving exhaust gas transferred from the computer room S on the lower floor, and the upper end of the transfer duct 9b is connected thereto. In addition, the transfer damper 31 and the fire damper 14 are interposed in the penetration part of the side wall 20a by the transfer duct 9b.
The transfer damper 31 is a damper having the same structure as that of the external intake damper 3, and the transfer intake opening 33 c is controlled to be in a fully open state or a fully closed state by the transfer damper motor 31 a to distribute or distribute the transfer exhaust. Can be blocked. The circulation path of the air flowing in from the second inner intake opening 33 b merges with the lower-floor exhaust circulation path flowing in from the transfer intake opening 33 c in the second intake chamber 33.

Inside the third air conditioning indoor unit 35, a second intake fan 35a for sucking air from the second intake chamber 33 side into the third air conditioning indoor unit 35 is provided. Further, a second intake fan cover 35 c is surrounded between the third air conditioning indoor unit 35 and the second intake chamber 33, and air in the second intake chamber 33 does not leak and is introduced into the third air conditioning indoor unit 35. ing.
Inside the third air conditioning indoor unit 35, a heat exchanger (not shown) for adjusting the temperature of the air introduced from the second intake chamber 33 is provided. In addition, the side surface of the third air conditioning indoor unit 35, an air outlet 35b for supplying the air introduced into the inside to room S ₅ is provided. Thereby, the office room 40 can be air-conditioned at any appropriate temperature.

With the above configuration, the heat of the air heated in the computer room S can be reused for heating the office room 40, and the cost for heating the office room 40 can be reduced. Further, since the transfer duct 9b extends substantially vertically, the warm air naturally moves to the upper floor. Therefore, warm air can be transferred easily and efficiently.
A temperature sensor for detecting the exhaust temperature from the lower floor may be provided in the middle of the transfer duct 9b, and the transfer damper 31 and the air damper 32 may be opened and closed according to the exhaust temperature, or the air flow may be interrupted. A configuration in which the size of the area is variably controlled may be employed.

[6-4. Others]
In the above-described embodiment and its modifications, the computer placement room S _2A and the air conditioner placement room S _2B are partitioned by the partition wall 18, but security management of the computer placement room S _2A is not necessary. In some cases or when the maintenance-free air conditioning indoor unit 5 is used, the partition wall 18 may be omitted. For example, as shown in FIG. 8, when the computer room S is composed of a ceiling S ₁ , an underfloor S ₃ and a single room S ₂ , the air conditioning indoor unit 5 and the computer 13 are installed in the same room S ₂ . May be. Even in such a configuration, the entire computer room S can be uniformly air-conditioned.

Moreover, as shown in FIG. 8, it is also conceivable that the intake duct 2 and the exhaust duct 9 in the above-described embodiment are omitted. Furthermore, the fire damper 14, the filter 15, the intake duct fan 16, the exhaust duct fan 17 and the like provided in the middle of these ducts 2 and 9 can be omitted as appropriate.
In addition, a vent hole may be provided in the partition wall 18 in the above-described embodiment to reduce the room temperature difference between the computer arrangement room S _2A and the air conditioner arrangement room S _2B , or from the air conditioner indoor unit 5 to the underfloor S _3. A part of the air supplied to the air conditioner may flow into the air conditioner arrangement room _S2B . Even with these configurations, the entire computer room S can be uniformly air-conditioned. In consideration of airflow of the air conditioner disposed chamber S _2B, each of the ceiling surface 6c and the floor surface 7c of the air conditioner disposed chamber S _2B, it may be provided ceiling hole 6a and rattle 7a similar holes.

In the embodiments and modifications described above, although through the side wall 20a in the intake duct 2 and the lower side of the exhaust duct 9 is suspended ceiling 6, through the position of the side wall 20a is optional, the ceiling S ₁ You may penetrate inside. For example, a case where the position of the exhaust duct 9 is changed is illustrated by a broken line in FIG. 7 (reference numeral 9b ′). Further, as shown in FIG. 8, outside air may be introduced from the ceiling back S ₁ and indoor air may be discharged from the ceiling back S ₁ .

In the embodiments and modifications described above, the ceiling surface 6b of the computer arrangement chamber S _2A, respectively on the entire surface of the floor surface 7b, the ceiling hole 6a, although louver 7a is formed, the hole for these ventilation It does not necessarily have to be provided on the entire surface of the ceiling surface 6b and the floor surface 7b. For example, as shown in FIG. 8, the ceiling hole 6a and the louver 7a are unnecessary when air circulation is ensured by the joint of the board forming the ceiling surface 6d and the gap between the joint portions of the floor surface 7d.

Further, in the above-described embodiment and its modification, the outer intake damper 3 and the exhaust shutter 8 are controlled to be in a fully open state or a fully closed state. Good. For example, as control for preventing overcooling of the computer placement room S _{2A in} the winter when the outside air temperature T is excessively low, the outside intake damper 3 and the exhaust shutter 8 are half opened (the air flow cross-sectional area is set to 50%). ) Control etc. can be considered. That is, the control amount for each control target may be variable.

Moreover, in the above-mentioned modification, although the case where warm air is transferred from the computer room S provided on the first floor of the building 20 to the office rooms 30 and 40 on the upper floor is shown, It may be the same floor or the lower floor, or may be indoors of another adjacent building.
In addition, the air conditioning system according to the present invention is not limited to a computer room, a server room, and an electrical panel room where computers and OA devices that generate heat constantly are arranged, but also as an air conditioning system for general offices and warehouses. It can be used. In addition, it is suitable for use when security measures for the space to be air-conditioned are required.

It is a mimetic diagram showing the whole air-conditioning system composition to which the indoor cooling method concerning one embodiment of the present invention was applied. It is a block block diagram which shows the structure of the controller in the air conditioning system to which the indoor cooling method which concerns on one Embodiment of this invention was applied. It is a flowchart which shows the control content in the air conditioning system to which the indoor cooling method which concerns on one Embodiment of this invention was applied. It is a schematic diagram which shows the whole structure of the air-conditioning system to which the indoor cooling method which concerns on the modification of this invention was applied. It is a block block diagram which shows the structure of the controller in the air conditioning system to which the indoor cooling method which concerns on the modification of this invention was applied. It is a flowchart which shows the control content in the air-conditioning system to which the indoor cooling method which concerns on the modification of this invention was applied. It is a schematic diagram which shows the whole structure of the air-conditioning system to which the indoor air-conditioning method which concerns on the modification of this invention was applied. It is a schematic diagram which shows the whole structure of the air-conditioning system to which the indoor cooling method which concerns on the modification of this invention was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake chamber 1a Air chamber 1b Outer intake opening 1c Inner intake opening 2 Intake duct 2a Intake duct cover 3 Outer intake damper 3a Outer intake damper motor 5 Air conditioning indoor unit 5a Intake fan 5b Pan type humidifier 5c Intake fan cover 5d Air outlet 5e Factory steam pipe 6 Suspended ceiling 6a Ceiling hole 6b, 6c, 6d Ceiling surface 7 Double floor 7a Gallery 7b, 7c, 7d Floor 8 Exhaust shutter 8a Exhaust shutter motor 9 Exhaust duct 9a Exhaust duct cover 9b Transfer duct 10, 10 'control device (electronic control device)
DESCRIPTION OF SYMBOLS 11 Temperature sensor 12 Sprinkler 13 Computer 14 Fire prevention damper 15 Filter 16 Intake duct fan 17 Exhaust duct fan 18 Partition wall 20 Building 20a Side wall 20b First floor slab 20c Second floor slab 20d Third floor slab 21 Fan 21a Return inlet 21b Air outlet 22 branch duct 23 transfer duct 24 chamber 25 second air conditioning indoor unit 26 electric dust collector 27a second temperature sensor 27b third temperature sensor 28 opening 29 damper 30, 40 office room (other room)
31 Transfer damper 31a Transfer damper motor 32 Aeration damper 32a Aeration damper motor 33 Second intake chamber 33a Air chamber 33b Second intake opening 33c Transfer intake opening 34 Aeration duct fan 35 Third air conditioning indoor unit 35a Second intake fan 35b Blower port 35c Second intake fan cover S Computer room (room)
S ₁ Ceiling behind S ₂ rooms S _2A Computer placement room (one of the small rooms)
S _2B air conditioner placement room (one of small rooms)
S ₃ S ₄ under the floor office of the ceiling S ₅ office of the living room S ₆ air-conditioned room (the other room)

Claims (6)

A cooling method for air-conditioning a room divided into three layers of a ceiling, a double floor, and a ceiling and a double floor with an air-conditioning indoor unit using outside air introduced from the outside and air circulating inside the room. ,
A first step of introducing the outside air into the room using the back of the ceiling and under the floor as a ventilation duct, and discharging the indoor air to the outside;
A second step of circulating the air in the room using the back of the ceiling and the underfloor as a ventilation duct;
An indoor cooling method comprising: a third step of selecting and performing either the first step or the second step according to the outdoor temperature. A cooling method for the room, wherein the room is divided into a plurality of small rooms by a partition wall,
In the first step, the outside air is introduced into the air-conditioning indoor unit installed in one of the plurality of small rooms, and another small unit is separated from the air-conditioning indoor unit using the underfloor as a ventilation duct. Introducing the outside air into the room,
2. The indoor cooling method according to claim 1, wherein in the second step, air in the other small room is circulated between the air conditioner and the back of the ceiling and the bottom of the floor as a ventilation duct. . In the third step, when the air temperature is equal to or lower than a predetermined temperature set in advance, the first step is selected and executed, and when the air temperature exceeds the predetermined temperature, the second step is selected. The indoor cooling method according to claim 1, wherein the indoor cooling method is performed. An external intake damper for controlling the flow rate of the outside air, which is interposed on a flow path for circulating the outside air from the outside to the ceiling, and a flow path for exhaust exhausted from the room to the outside. An indoor cooling method comprising an exhaust shutter that controls the flow rate of exhaust, a control device that controls opening and closing of the outer intake damper and the exhaust shutter, and a temperature sensor that detects the air temperature,
In the third step, the air temperature detected by the temperature sensor is input to the control device,
In the first step, the control device opens the outer intake damper and the exhaust shutter,
4. The indoor cooling method according to claim 3, wherein, in the second step, the outer intake damper and the exhaust shutter are closed by the control device. The indoor cooling method according to any one of claims 1 to 4, further comprising a fourth step of cooling the outside air by watering prior to introducing the outside air into the room. The indoor cooling method according to any one of claims 1 to 5, further comprising a fifth step of transferring the indoor air exhausted in the first step to another chamber.

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